TWI388407B - Electric drive tools and electric drive tools - Google Patents

Description

Electric drive tool and electric drive tool device

The present invention relates to a rechargeable electric drive tool and an electric drive tool device.

In general, the rechargeable electric drive tool uses a battery (secondary battery) such as a nickel-cadmium battery in the driving power source. When the battery is gradually consumed and the torque is reduced, that is, the screw locking ability is lowered, the external battery can be used at any time. The power source recharges the battery to restore its torque.

However, the battery has many problems such as heavy load, long charging time, short charge and discharge life, use of heavy metals, harmful substances, etc., and has adverse effects on the environment. Therefore, regarding the driving power supply of the rechargeable electric driving tool, the electric double layer capacitor has recently Received attention. In contrast to batteries, electric double-layer capacitors have the advantages of small size, light weight, rapid charging, long charge and discharge life, and no use of heavy metals or harmful substances, which are beneficial to the environment.

When the electric double-layer capacitor is used in the driving power supply, it is used in parallel with the battery to manage the charging voltage of the electric double-layer capacitor in conjunction with the output voltage of the battery (for example, please refer to the patent literature). 1).

[Patent Document 1] Utility New Case Registration No. 3100119

As described above, the conventional rechargeable electric driving tool has a battery while the electric double layer capacitor is provided, and the charging voltage of the electric double layer capacitor is managed by the output voltage of the battery, so that the electric double layer capacitor is not required. Charger, charging control circuit. However, from another point of view, it is found that the control technology for correctly charging the electric double layer capacitor to the rated voltage is not established, and the charging operation becomes convenient for the short-term charge and discharge cycle unique to the electric double layer capacitor. Technology has not been produced. All in all, having a battery at the same time does not take advantage of the electric double layer capacitor.

The present invention has been made to solve the above problems of the prior art, and an object of the invention is to provide a rechargeable electric drive tool and an electric drive tool device that are small, lightweight, and can be rapidly charged and can reduce operating costs.

Another object of the present invention is to provide a rechargeable electric driving tool and an electric driving tool device which can correctly charge an electric double layer capacitor to a predetermined reference voltage, and prevent an excessive double charging voltage from causing damage or malfunction of the electric double layer capacitor. And, to prevent too small charging voltage caused by insufficient or early drop of the screw lock ability.

Another object of the present invention is to provide a rechargeable electric driving tool and an electric driving tool device which can accurately control the rotation characteristics of the motor according to the output voltage of the electric double layer capacitor to improve the stability of the screw lock energy.

Another object of the present invention is to provide a rechargeable electric driving tool and an electric driving tool device, which can improve the convenience of use in charging operation, and eliminate the cumbersome feeling of the user by short-term charging and discharging cycles, thereby providing the original screw 拴. The working nature of the lock action.

In order to achieve the above object, an electric drive tool according to the present invention has a drill holder that detachably supports a drive tool drill, a motor that rotationally drives the drill holder, and an electric double layer capacitor that supplies the motor to the motor. a driving tool connection terminal electrically connected to the electric double layer capacitor and an external DC power source, a control unit that controls a charging voltage of the electric double layer capacitor and controls a rotation operation of the motor, and a housing holder for supporting or supporting the drill holder and the motor The electric double layer capacitor, the driving tool connection terminal, and the outer casing of the control unit, wherein the control unit includes a first switching circuit that is connected in series to the DC power supply and the electric double layer capacitor, and the DC power supply and the electric double a layer capacitor is connected in parallel with a voltage keying circuit and a charging control circuit, wherein the first switching circuit is turned on in order to enable the DC power supply to supply a charging current to the electric double layer capacitor, so that the voltage monitoring circuit monitors the electric double layer The charging voltage of the capacitor causes the first switch to be electrically Off, when the charging voltage of the electric double layer capacitor voltage reaches a first reference state detected by the voltage monitoring circuit that stops charging of the electrical double layer capacitor.

In the electric drive tool according to the present invention, a control unit for collectively controlling the charging voltage of the electric double layer capacitor and the rotation operation of the motor is built in, and the electric double layer capacitor constitutes the motor driving power source, so that it is compact and lightweight. It can be charged quickly and can reduce operating costs.

According to one of the preferred configurations of the present invention, the first switching circuit is repeatedly turned on and off in a certain cycle. As a further preferred mode, the voltage monitoring circuit monitors the charging voltage of the electric double layer capacitor after a predetermined delay time (preferably, the closing period is about to end) after the first switching circuit is switched from the on state to the off state. . In this way, after the first switching circuit is turned off, the voltage between the terminals of the electric double layer capacitor is stabilized after a predetermined delay time, and then the voltage monitoring circuit is monitored, so that the charging can be surely completed at the tenth point when the charging reaches saturation. The charging voltage of the electric double layer capacitor after the end of charging is not excessive or insufficient, and can be consistent with the first reference voltage (for example, the maximum rated voltage). Further, it is preferable to increase the ratio of the closing period or shorten the cycle period as the number of times of the opening and closing cycles increases.

As one of the best modes of the present invention, the voltage monitoring circuit has a signal for outputting a first logic value when the applied voltage is lower than the first reference voltage, and outputs a second logic when the applied voltage is above the first reference voltage. a reference voltage detecting circuit of the value signal and a second switching circuit connected in parallel with the reference voltage detecting circuit, in order to electronically block the reference voltage detecting circuit from the electric double layer capacitor, the second switching circuit is turned off, in order to turn the electric double The charging voltage of the layer capacitor is applied to the reference voltage detecting circuit to turn on the second switching circuit.

In this case, as one of the optimum modes, the reference voltage detecting circuit has a shunt regulator including a switching element and causing the switching element to take one of an on state or a non-conduction state according to a voltage level of the applied voltage, and a shunting regulator as a first light-emitting element connected in series, and a first light-emitting element together forming a first light-receiving element of the first optocoupler and a binary signal generating circuit connected to the first light-receiving element, and at the first When the light receiving element is in a non-conducting state, a signal of a first logic value is generated, and when the first light receiving element is in an on state, a signal of a second logic value is generated; when the voltage of the electric double layer capacitor is lower than the first reference voltage, the current is shunted The voltage regulator maintains the switching element in a non-conducting state, whereby in the first optocoupler, the light emitting element does not emit light, and the first light receiving element remains in a non-conducting state, and the binary signal generating circuit generates the first logic value. a signal; when the voltage of the electric double layer capacitor reaches the reference voltage, the shunt regulator causes the switching element to be in an on state, whereby in the first optocoupler, the illuminating element Illuminating, the first light receiving element is in an on state, and the second signal generating circuit generates a second logic value signal; the second switching circuit has a second light receiving element connected in series with the reference voltage detecting circuit and the second light receiving element. a second light-emitting element of the second photocoupler; selectively controlling the second light-receiving element to be in an on state or a non-conduction state by selectively controlling the second light emitting element to be one of a light emitting state or a non-light emitting state; A state.

Further, according to a configuration of one of the best modes of the present invention, the control unit has a switching element for connecting the electric double layer capacitor and the motor in series, a motor detection output voltage voltage detecting circuit and a motor control circuit for the electric double layer capacitor, In order to generate a rotational torque of the motor, when the output voltage of the electric double layer capacitor is higher than the second reference voltage, the no-load rotation speed of the motor is maintained at a preset reference rotation speed, and the switching element is turned on and off by the pulse width control method. Controlling, when the output voltage of the electric double layer capacitor is lower than the second reference voltage, keeping the switching element in an open state. In this configuration, even if the range of the output voltage of the electric double layer capacitor is increased, the fluctuation range of the motor rotation speed can be reduced, and the stability (equality or reproducibility) of the screw locking ability can be improved.

The first electric drive tool device of the present invention has an electric drive tool of the present invention having a built-in charge control function as described above, and a drive for accommodating or supporting a DC power source to be detachably engaged to the electric drive tool a tool engaging portion, a connecting end unit of the unit connecting terminal electrically connected to the DC power source and electrically and electronically connectable with the driving tool connecting terminal of the electric driving tool, and the electric driving tool is engaged to the driving tool engaging portion, the electric driving tool The drive tool connection terminal and the unit connection terminal of the charging unit are physically and electronically connected.

Further, the second electric drive tool device of the present invention has an electric drive tool having a bit holder that detachably supports the drive tool bit, a motor that rotationally drives the bit holder, and an electric double for the motor supply circuit a layer capacitor, a driving tool connection terminal for electrically connecting an electric double layer capacitor and an external DC power source, a first control unit for controlling a rotation operation of the motor, a storage or supporting bit holder, a motor, an electric double layer capacitor, and a driving tool a connection terminal and a casing of the first control portion; and a charging unit that houses or supports a DC power source, detachably engages a driving tool engagement portion of the electric driving tool, and controls a charging voltage of the electric double layer capacitor of the electric driving tool a second control unit, and a unit connection terminal electrically connected to the DC power source and the second control unit and electrically and electronically connected to the drive tool connection terminal of the electric drive tool; the second control unit has a DC power supply and an electric double layer The capacitor is connected in series as a first switching circuit for the DC power supply and the electric double layer capacitor a connected voltage monitoring circuit and a charging control circuit for causing a DC power supply to supply a charging current to the electric double layer capacitor, causing the first switching circuit to be turned on, and in order for the voltage monitoring circuit to monitor the charging voltage of the electric double layer capacitor, the first switching circuit is Turning off, when the state in which the charging voltage of the electric double layer capacitor reaches the first reference voltage is detected by the voltage monitoring circuit, stopping charging of the electric double layer capacitor; by the electric driving tool engaging the driving tool engaging portion, the electric driving tool The drive tool connection terminal and the unit connection terminal of the charging unit are physically and electronically connected.

In the electric drive tool device of the present invention, when the electric drive tool is engaged to the drive tool engagement portion of the charging unit, the drive tool connection terminal of the electric drive tool and the unit connection terminal of the charging unit are physically and electronically connected by the charging unit The internal DC power supply supplies a charging current to the electric double layer capacitor in the electric drive tool. In this case, on the first electric drive tool device, the control unit in the electric drive tool controls all charging operations of the electric double layer capacitor, and in the first electric drive tool device, the second control unit in the charging unit controls the electric control All charging actions for double layer capacitors.

According to one of the preferred configurations of the present invention, the driving tool connection terminal of the electric driving tool includes a driving tool connection terminal of the positive electrode and a driving tool connection terminal of the negative electrode, and the unit connection terminal of the charging unit includes the unit connection terminal of the positive electrode and the negative electrode. The unit is connected to the terminal, so that when the electric drive tool is normally engaged to the charging unit, the unit connection terminal of the negative electrode is first brought into contact with the driving tool connection terminal of the negative electrode before the unit connection terminal of the positive electrode and the driving tool connection terminal of the positive electrode are in contact. In this configuration, even if an abnormal high voltage such as a surge voltage enters the electric drive tool from the charging unit, it can be surely jumped to the main power supply line to protect the circuit components in the electric drive tool.

Further, according to the configuration of one of the best modes, the micro switch is disposed in the vicinity of the driving tool connecting terminal or the unit connecting terminal, and when the electric driving tool is correctly engaged to the driving tool engaging portion of the charging unit, the unit connecting terminal or the driving tool connecting terminal The micro switch is turned on, and the charging operation of the electric double layer capacitor is started in response to the opening operation of the micro switch.

Further, according to a configuration of one of the best modes, in the electric drive tool, the outer casing has a direction extending coaxially with the driving tool bit supported by the bit holder and at least accommodating the bit holder, the motor and the connecting terminal. a columnar portion and a grip portion that is approximately a right angle or an obtuse angle from the side of the bit holder and is supported from the columnar portion; in the charging unit, the driving tool engaging portion has a receiving portion that is connected to the driving tool and In the correct state or inclination of the polarity of the unit connection terminal, the columnar portion of the housing is received in a pluggable manner from the side of the bit holder in a pluggable manner, and the unit connection terminal is mounted inside the housing portion in the housing portion Among them, the unit connection terminal is connected to the drive tool connection terminal of the electric drive tool.

Further, according to a configuration of one of the best modes, in the electric drive tool, the outer casing has a bulging portion which is bulged outward from the columnar portion in the radial direction and extends in the longitudinal direction of the columnar portion from the side of the drill holder It is to be noted that at least a front portion of the ridge portion is formed with a slit extending in the longitudinal direction of the columnar portion, and a driving tool connection terminal is disposed at a depth of the slit; and on the other hand, a driving tool engagement portion is accommodated in the charging unit. The portion has a guiding groove for guiding the bulging portion of the outer casing of the electric driving tool, and the unit connecting terminal is disposed in the guiding groove. Further, the ridge portion of the outer casing of the electric drive tool is guided by the guide groove of the drive tool engagement portion, and when the columnar portion of the outer casing of the electric drive tool is inserted into the accommodating portion of the drive tool engagement portion, the unit connection terminal relatively enters The slit of the ridge is connected to the drive tool connection terminal. Further, in the electric drive tool, the outer casing has the first and second raised portions at different positions on the outer circumference of the columnar portion, and the driving tool connecting terminal of the positive electrode is disposed deep in the slit of the first raised portion, and the second raised portion A drive tool connection terminal of the negative electrode is disposed deep in the slit of the portion. On the other hand, in the charging unit, the accommodating portion for driving the tool engaging portion has first and second guiding grooves for guiding the first and second ridges, respectively, and the positive electrode is disposed in the first guiding groove The unit connection terminal is provided with a negative unit connection terminal among the second guide grooves. In addition, the first and second raised portions of the electric drive tool are respectively guided by the first and second guiding grooves of the charging unit, and when the columnar portion of the outer casing of the electric driving tool is inserted into the receiving portion of the driving tool engaging portion, The unit connection terminals of the positive electrode and the negative electrode of the charging unit are relatively inserted into the slits of the first and second raised portions, and are connected to the driving tool connection terminals of the positive electrode and the negative electrode. Furthermore, in the electric drive tool, the first ridge portion and the second ridge portion have different widths in the outer circumferential direction of the cylindrical portion of the outer casing, and on the other hand, in the charging unit, the first guide groove is at the accommodating portion The inner circumferential direction has a width corresponding to the first raised portion, and the second guiding groove has a width corresponding to the second raised portion in the inner circumferential direction of the housing portion.

Further, according to a configuration of one of the best modes, in the charging unit, the accommodating portion penetrates the driving tool engaging portion, and the guiding groove and the unit connection are respectively disposed at a predetermined position in the vicinity of the first opening of the accommodating portion of the driving tool engaging portion. The terminal and the guide groove and the unit connection terminal are respectively disposed at predetermined positions in the vicinity of the second opening on the opposite side to the first opening. In addition, the columnar portion of the outer casing of the electric drive tool may be inserted into the receiving portion of the charging unit from one of the first and second openings, and each unit connecting terminal may be connected to the corresponding portion in the receiving portion. The drive tool of the electric drive tool is connected to the terminal.

Further, according to a configuration of one of the best modes, the charging unit can support the driving tool engaging portion in such a manner as to rotate about a fulcrum perpendicular to the central axis of the accommodating portion of the driving tool engaging portion, and has an angle at any angle Fixed support.

According to the configuration of the electric drive tool and the electric drive tool device of the present invention, the structure and the function as described above can be made compact and lightweight, can be rapidly charged, and the operating cost can be reduced. Furthermore, the electric double layer capacitor can be charged to a predetermined reference voltage without excessive or insufficient, so that the electric double layer capacitor can be destroyed, malfunctioned, etc., and the shortage or early drop of the screw locking ability can be prevented. . Further, the motor rotation speed can be controlled to a predetermined characteristic according to the magnitude of the output voltage of the electric double layer capacitor, so that the stability of the screw locking ability can be improved. Furthermore, the ease of use in the charging operation can be improved, and the workability of the screw shackle action can be improved.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a view showing the appearance of an electric drive tool according to an embodiment of the present invention. The electric drive tool 10 may have a resinous outer casing 12 that can house or mount (support) functions of all electric drive tools except the charger 78 described later. The outer casing 12 has a cylindrical portion 16 that rotatably supports the bit holder 14 at the front opening portion and a substantially right or obtuse angle from the side of the bit holder 14 and branches from the column portion 16 to the lower side. The grip portion 18 is gripped. The rear end of the columnar portion 16 and the lower end of the grip portion 18 are blocked. Further, in this embodiment, the side of the drill holder 14 is the front portion of the outer casing 12 and the side of the grip portion 18 is the lower portion of the outer casing 12 with reference to the columnar portion 16.

The bit holder 14 is detachably inserted into the drive tool bit 20 that will greet the screw or screw as a shackle object and is fixedly supported. In the center portion in the longitudinal direction of the outer columnar portion 16 , an upper raised portion 22 that is raised from the columnar portion 16 upward and has a substantially fixed height and width and that extends straight in the longitudinal direction of the columnar portion 16 is formed. In the upper raised portion 22, an upper slit 24 extending straight in the longitudinal direction of the columnar portion 16 is formed from the front portion through the intermediate portion and along the center line in the width direction of the upper raised portion 22. At the depth of the upper slit 24, an upper connector terminal 56 (second drawing) of a positive electrode to be described later is disposed. On the side of the front portion of the upper raised portion 22, a positive sign 26 is attached, which indicates that the upper connector terminal 56 provided on the inner side of the upper raised portion 22 is a positive electrode.

Immediately behind the positive sign 26, the side surface of the outer casing column portion 16 is rearward, and a step portion 28 having a larger diameter and having a substantially semicircular or circular arc shape is formed. As will be described later, the step portion 28 functions as a stopper that defines the insertion depth position when the electric driving tool 10 is inserted into the column hole of the driving tool holding portion of the charging unit 70 (Figs. 3 to 10). Further, a state display lamp 30 (light-emitting diodes 196, 198 of FIG. 14 to be described later) composed of a light-emitting diode is directly behind the upper raised portion 22, and the light-emitting surface is exposed and attached to the upper surface of the columnar portion 16. As will be described later, the state in the electric drive tool 10, in particular, the respective states during charging operation (charging, charging, abnormal charging, etc.) are transmitted to the user through the illumination type of the state indicator lamp 30.

On the opposite side of the upper raised portion 22, that is, the lower surface of the columnar portion 16, a lower raised portion 32 that is swelled at a substantially fixed height and width and extends straight in the longitudinal direction of the columnar portion 16 is formed. On the lower raised portion 32, a lower slit 34 is formed which extends straight from the front portion through the intermediate portion and along the center line in the width direction of the lower raised portion 32 in the longitudinal direction of the columnar portion 16. In the depth of the lower slit 34, a lower connector terminal 60 (second drawing) of a negative electrode to be described later is disposed. On the side of the front portion of the lower raised portion 32, a minus sign 36 is attached, which indicates that the lower connector terminal 60 provided on the inner side thereof is a negative electrode.

The lower raised portion 32 has a smaller width than the upper raised portion 22 and a smaller length, and the trailing end is in front of the grip portion 18. A trigger 38 is attached to the root of the front portion of the grip portion 18 near the trailing end of the lower raised portion 32. When the grip portion 18 is gripped and the trigger 38 is buckled by the index finger of the person, the motor 46 (Fig. 2), which is built into the outer casing 12, is started to operate, so that the driving tool bit 20 and the bit holder 14 are integrated and rotated. Drive it.

Fig. 2 shows an arrangement structure of main components or mechanisms housed in the electric drive tool 10. Among the columnar bodies 16 of the outer casing 12, the brake switch 40, the clutch 42, the gear 44, the motor 46, the printed wiring board 48, and the first electric double layer capacitor are sequentially disposed deep or rearward from the bit holder 14. Electric Double Layer Capacitor, hereinafter referred to as "EDLC"). On the printed wiring board 48, electronic components constituting a control unit 110 (Fig. 14) to be described later are packaged.

The grip portion 18 is hollow, in which a double layer capacitor 50B is housed. As described above, the first and second electric double layer capacitors 50A and 50B are housed in the outer casing 12 at separate positions, but in terms of electric circuits, they are connected in series via an electronic circuit (not shown). Inside the trigger 38, a microswitch 52 for starting the shackle screw is provided which is switched in conjunction with the trigger. A slide switch 54 for switching the rotational direction (forward/reverse rotation) of the driving tool bit 20 is attached to the root of the upper end of the rear portion of the nip portion 18.

An upper connector terminal 56 is disposed at a position directly below the upper slit 24 (first drawing) on the inner side of the upper raised portion 22 of the outer casing column body 16, and directly behind the upper connector terminal 56, A microswitch 58 is provided for initiating a charging action. On the other hand, the lower connector terminal 60 is disposed at a position directly above the lower slit (first drawing) inside the lower raised portion 32. As will be described later, when the electric driving tool 10 is correctly mounted to the charging unit 70 (Figs. 3 to 10), the positive contact soldering upper connector terminal 56 of the charging unit 70 is physically and electronically connected, and The microswitch 58 is switched from the open position to the closed position, and the negative contact of the charging unit 70 is also physically and electronically coupled to the lower connector terminal 60.

3 to 8 show the configuration of the charging unit 70 of this embodiment. The charging unit 70 and the above-described electric driving tool 10 are combined to form an electric driving tool device of this embodiment.

The charging unit 70 has a frame 72 having a rectangular parallelepiped shape, and a pair of support plates 74 which are vertically and parallel to each other with a certain interval on the frame 72 to span the level between the pair of support plates 74. A drive tool holding portion 76 that is centered and supported by a fulcrum (not shown) is rotatably displaced.

A charger 78, which may be composed of a switching power supply, is housed in the casing 72. The charger 78 is supplied through a power line 80, and is supplied with a commercial AC voltage such as 100V or 200V from a commercial AC power source to output a fixed DC voltage such as 6.5V. Further, EDLC50 (50A, 50B) of the maximum rated voltage, i.e., the charge voltage V _s is lower than the reference voltage 78 of the charger output, for example, 5.4 volts. The output terminal of the charger 78 is electrically connected to the later-described contacts (98R, 100R) and (98L, 100L) in the drive tool holding portion 76 via the cable line 82 in the transmission unit. A mounting plate 84 is fixed to the bottom surface of the frame 72.

The driving tool holding portion 76 has a pair of (left and right) end faces that are opposed to each other and have a column hole 86 penetrating therethrough. The column hole 86 can be inserted into the electric driving tool 10 in a state or a tendency shown in FIG. 9 or FIG. Here, Fig. 9 shows a fixed use example in which the charging unit 70 is disposed on the table 88 in an approximately horizontal manner, and Fig. 10 shows a wall-mounted use example in which the charging unit 70 is suspended on the wall 90 in an approximately vertical manner.

Figs. 3 to 5 show the state of the charging unit 70 (particularly, the driving tool holding portion 76) of the use type of the fixed type (Fig. 9). In this case, as shown in FIG. 3, the driving tool holding portion 76 takes an attitude in which the end surface 76R of one side (right side) faces obliquely upward and the end surface 76L of the other side (left side) faces obliquely downward. In order to perform such posture change or adjustment, the screw 92 attached to the upper end portion of the support plate 74 is loosened, the drive tool holding plate 76 is rotationally displaced, and the screw 92 is tightened at an appropriate angular position to fix it. As described above, the electric drive tool 10 (not shown in FIGS. 3 to 5) is inserted into the column hole 86 of the driving tool holding portion 76 from the side of the right end surface 76R which is obliquely upward.

As shown in FIGS. 4 and 5, a pair of upper and lower grooves 94R, 96R are formed from the right end surface 76R of the driving tool holding portion 76 toward the depth of the column hole 86. The pair of grooves 94R, 96R are an upper right guiding groove and a lower right guiding groove. In the fixed type of use, they respectively receive and guide the upper ridge 22 of the outer cylindrical portion 16 of the electric driving tool 10. And a lower raised portion 32. As described above, in the electric drive tool 10, the upper ridge portion 22 has a larger width than the lower ridge portion 32, and correspondingly, in the charging unit 70, the upper right guide groove 94R is formed to be smaller than the lower right guide groove 96R. Still big width.

The upper right side contact 98R of the positive electrode composed of a plate-shaped conductor extending parallel to the central axis of the column hole 86 is attached to the central portion in the width direction of the bottom portion of the upper right side guide groove 94R and the lower right side guide groove 96R, respectively. The lower right side contact 100R of the negative electrode. The upper right side contact 98R and the lower right side contact 100R are electrically connected to the positive output terminal and the negative output terminal of the charger 78 of the housing 72 via the cable 82.

As shown in Fig. 3, the upper right side corner portion of the side surface of the driving tool holding portion 76 is provided with a positive number 102R indicating that the upper right side contact 98R provided on the inner side upper right side guiding groove 94R is the positive electrode. On the other hand, the lower right side corner portion of the side surface of the driving tool holding portion 76 is provided with a minus number 104R indicating that the lower right side contact 100R provided on the inner right lower side guiding groove 96R is the negative electrode.

Fig. 6 to Fig. 8 show the state of the charging unit 70 (especially the driving tool holding portion 76) of the use type of the wall type (Fig. 10). In this case, as shown in FIG. 6, the drive tool holding portion 76 has an attitude in which the left end surface 76L faces obliquely upward and the right end surface 76R faces obliquely downward. The screw 92 can also be operated in the same manner as described above by this posture change or adjustment. Thus, the electric drive tool 10 (not shown in FIGS. 6 to 8) is inserted into the column hole 86 of the driving tool holding portion 76 from the side of the left end surface 76L facing obliquely upward.

As shown in FIGS. 7 and 8, a pair of upper and lower concave grooves 94L, 96L are formed from the left end surface 76L of the driving tool holding portion 76 toward the depth of the column hole 86. The pair of grooves 94L, 96L are an upper left guiding groove and a lower left guiding groove. In the wall-mounted type, they respectively receive and guide the lower ridge 32 of the outer cylindrical portion 16 of the electric driving tool 10. And an upper raised portion 22. As described above, in the electric drive tool 10, the upper ridge portion 22 has a larger width than the lower ridge portion 32, and correspondingly, on the left side of the drive tool holding portion 76, the lower left guide groove 96L is formed to be larger than the upper left guide portion. The groove 94L also has a large width.

The upper left side contact 98L of the negative electrode composed of a plate-shaped conductor extending parallel to the central axis of the column hole 86 is attached to the central portion in the width direction of the bottom portion of the upper left side guide groove 94L and the lower left side guide groove 96L, respectively. The lower left contact 100L of the positive electrode. The upper left contact 98L and the lower left contact 100L are transmitted through the cable 82, and are electrically connected to the negative output terminal and the positive output terminal of the charger 78 of the housing 72, respectively.

As shown in Fig. 6, the upper left side corner portion of the side surface of the driving tool holding portion 76 is provided with a negative number 102L indicating that the upper left side contact 98L provided on the inner side upper left guiding groove 94L is the negative electrode. On the other hand, the lower left side corner portion of the side surface of the driving tool holding portion 76 is provided with a positive sign 104L indicating that the lower left side contact 100L provided on the inner side lower left guiding groove 96L is the positive electrode.

Further, the upper left side contact 98L of the upper left guiding groove 94L may be set to a positive pole, and the lower left guiding groove 96L may be set to a negative pole, and the left side guiding groove 94L may accommodate a casing column of the electric driving tool 10 . The upper raised portion 22 of the portion 16 and the lower left guiding groove 96 accommodate the lower raised portion 32.

Here, a configuration (action) in which the electric drive tool 10 is electrically connected to the drive tool holding portion 76 of the charging unit 70 when the electric drive tool 10 is attached will be described in detail with reference to FIGS. 11 , 12 , and 13 . The illustrated example is a case where the fixed type (Fig. 9) is used, that is, the case where the electric driving tool 10 is inserted into the driving tool holding portion 76 of the charging unit 70 from the side of the right end surface 76R.

In this case, as described above, the upper ridge portion 22 and the lower ridge portion 32 of the outer casing column portion 16 of the electric drive tool 10 are respectively received by the upper right guide groove 94R and the lower right guide groove of the drive tool holding portion 76. The 96R guides and enters the depth of the column hole 86. Then, the upper right side contact 98R provided to the upper right guide groove 94R enters the upper slit 24 of the electric drive tool 10. On the other hand, the lower right side contact 100R provided to the lower right guide groove 96R relatively enters the lower slit 32 of the electric drive tool 10. As described above, in the electric drive tool 10, the lower connector terminal 60 is disposed at a position (for example, several millimeters) in front of the upper connector terminal 56. Thereby, as shown in Fig. 11, before the upper connector terminal 56 is connected to the upper right side contact 98R (previous moment), the lower connector terminal 60 is connected to the upper and lower right side points 100R. Additionally, the upper connector terminal 56 and the lower connector terminal 60 can be constructed as two-contact cantilevered contacts as shown.

Further, as shown in Fig. 12, when the leading end of the upper right side contact 98R reaches (contacts) the contact portion of the upper connector terminal 56, the lower connector terminal 60 relatively frictionally contacts the contact of the lower right side contact 100R. Point, go forward. Thereafter, the upper right side contact 98R also advances while frictionally contacting the contact portion of the upper connector terminal 56, and finally, as shown in Fig. 13, the tip end of the upper right side contact 98R is pressed through the operation lever 58a of the micro switch 58. Button 58b. The button 58b is pressed by the microswitch 58 to switch its contact position from the previous open position to the closed position. At this stage, the slit formed on the side surface of the outer casing column portion 16 of the electric driving tool 10 is engaged with the right end surface 76a of the driving tool holding portion 76, that is, the edge portion of the column hole 86, by the protruding step portion 28. As such, the installation of the electric drive tool 10 on the charging unit 70 ends.

Further, in this embodiment, as described above, the driving tool connection terminals on the side of the electric driving tool 10, that is, the arrangement positions of the positive connector terminal 56 and the negative connector terminal 60 are respectively indicated. No. 26 and minus 36 are attached to the outer casing column portion 16, and the unit connection terminals on the side of the charging unit 70, that is, the positions of the positive electrode contacts 98R (100L) 56 and the negative electrode contacts 100R (98L) are respectively disposed. The positive sign 102R (104L) and the negative sign 104R (102L) which are shown are added to the side surface of the unit holding portion 76. These polarities indicate that the drive tool holding portion 76 of the charging unit 70 is mounted in the correct position or orientation of the outer casing column portion 16 of the user's movable drive tool 10 as a mark.

However, the user sometimes accidentally inserts the outer casing column portion 16 of the electric drive tool 10 into the driving tool holding portion 76 of the charging unit 70 in the opposite direction when the screw locking operation is performed. However, in this case, the upper ridge portion 22 of the larger width of the electric drive tool 10 may hit the entrance of the guide groove 96R (94L) of the smaller width of the charging unit 70 and cannot enter the depth, thereby preventing The opposite polarity is installed, and the user can directly find their own mistakes.

Next, the configuration and operation of the control unit in the electric drive tool 10 of this embodiment will be described with reference to Figs. 14 to 18 .

Fig. 14 shows the circuit configuration of the control unit 110 attached to the electric drive tool 10. As described above, the control unit 110 is composed of a plurality of electronic circuits and electronic components mounted on the printed wiring board 48 (second drawing). In particular, the microcomputer 112 is in charge of all of the main control functions of the control unit 110.

The upper connector terminal 56 of the positive electrode is connected to the positive power source line 114, and the lower connector terminal 60 of the negative electrode is connected to the negative power source line 116 of the total potential. As described above, in a state where the electric drive tool 10 is correctly mounted to the charging unit 70, the positive electrode connector terminal 56 of the electric drive tool 10 and the negative electrode of the charging unit 70 are connected to the positive electrode contact 98R (or 100L) of the charging unit 70. A negative connector terminal 60 of the electric drive tool 10 is connected to the contact 100R (or 98L).

The EDLC 50 (50A, 50B) can be connected in series with a switching circuit composed of a field effect transistor (FET) 118 between the positive power supply line 114 and the negative power supply line 116. In addition, the EDLC 50 and the voltage monitoring circuit 120 are connected in parallel. The gate terminal of the FET 118 is connected to the signal output terminal RB _{0 of the} microcomputer 112 through the resistor 119. When the microcomputer 112 outputs a low level signal through the signal output terminal RB ₀ , the FET 118 is turned off, and the EDLC 50 is electronically blocked from the charger 78 . When the microcomputer 112 outputs a high level signal through the signal output terminal RB ₀ , the FET 118 is turned on, and the charging current is supplied from the charger 78 to the EDLC 50.

The voltage monitoring circuit 120 and the rated voltage detecting circuit 122 and the output end of the optocoupler 124 are connected in series by a light receiving element (photoelectric crystal). The rated voltage detecting circuit 122 and the resistor 126, the input terminal light emitting element (photodiode) of the optocoupler 128, and the shunt regulator 130 are connected in series.

The shunt regulator 130 can have a built-in switching element composed of a transistor, a voltage comparator, and a reference voltage generating circuit. In more detail, the switching element is connected to the photodiode of the optocoupler 128. An output terminal of the reference voltage generating circuit is connected to one of the input terminals of the voltage comparator, and a node N _{a of the} voltage dividing point of the resistor dividing circuit composed of the two resistors 132, 134 is connected to the other input terminal, and the output terminal Connected to the control terminal of the switching element. Here, the reference voltage generating circuit generates a predetermined reference voltage corresponding to the maximum rated voltage V _{c of the} EDLC 50. Further, at the node N _a of the resistor divider circuit (132, 134), _a divided voltage proportional to the charging voltage V _ED of the EDLC 50 can be obtained. During this period when the divided voltage is lower than the above reference voltage, the voltage comparator can generate a low-level output signal, and the switching element remains in a non-conducting state. In addition, when the charging voltage V _{ED of the} EDLC 50 reaches the maximum rated voltage V _s (5.4 volts), the divided voltage of the node N _a is equal to the above reference voltage, the voltage comparator generates a high-level output signal, and the switching element becomes conductive. status.

The output end light receiving element (photovoltaic transistor) of the optocoupler 128 is an NPN transistor, the connector terminal of which is connected to the output terminal of the voltage regulator 138 through the resistor 136, and is connected to the signal input terminal RA of the microcomputer 112 through the resistor 140. ₃ . During the shunt regulator 130 of the switching element is non-conducting state, the optocoupler 128, the photodiode does not emit light, the photo transistor is turned off, to obtain a high at the node between the resistors 136, 140 N _b The signal of the high level is input to the signal input terminal RA _{3 of the} microcomputer 112. When the switching element of the shunt regulator 130 becomes conductive and a current flows, in the optocoupler 128, the photodiode emits light, and the photo transistor turns on (becomes turned on) from the low level signal. The node N _{b is} input to the signal input terminal RA _{3 of the} microcomputer 112.

The insertion of the resistor 126 provided to the voltage monitoring circuit 120 is used to limit the current when the switching element of the shunt regulator 130 is turned on. Further, _a resistor 136 connected between the output terminal of the regulator 138 to be described later and the node Na is formed to obtain a binary value (H/L) at the output terminal of the photovoltaic transistor of the optocoupler 128, that is, the node N _b . The binary signal generation circuit of the signal.

In the optocoupler 124, the positive input terminal of the light emitting element (photodiode) 142 is connected through resistor 138 to the output terminal of the regulator, the negative terminal of the RB signal output terminal connected to the micro-dots 112 ₄ brain. When the microcomputer 112 outputs a high-level signal to the signal output terminal RB ₄ , in the optocoupler 124, the photodiode does not emit light, and the photo-electric crystal is turned off, whereby the rated voltage detecting circuit 122 performs power from the EDLC 50. Separation. When the microcomputer 112 outputs a low-level signal to the signal output terminal RB ₄ , in the optocoupler 124, the photodiode emits light, and the photo-electric crystal turns on (becomes into an on state), whereby the rated voltage detecting circuit 122 and EDLC50 is used for electronic connection.

The optocouplers 124, 128 are electrically insulated from the EDLC 50 and the microcomputer 112, so that the microcomputer 112 is not affected.

The output terminal of the voltage regulator 138 is also connected to the power supply voltage terminal V _{cc of the} microcomputer 112. The output voltage of the step-up DC/DC converter 144 is input to the input terminal of the regulator 138. The DC/DC converter 144 can be composed of an interrupting type switching power supply that can input a DC voltage on the positive power supply line 114 in the range of 0.8 to 9.5 volts, and then output a 9.5 volt DC voltage. The voltage regulator 138 may be composed of a packet loss regulator or a series of regulators, which removes variations in the output voltage of the DC/DC converter 144, and outputs an internal power supply voltage of a constant voltage of 5 volts.

The output terminals of the voltage regulator 138 are also coupled to the nodes N _c , N _d , N _e through resistors 146, 148, 150. These nodes N _c , N _d , N _{e are} connected to the signal input terminals RA ₄ , RA ₆ , RA _{7 of the} microcomputer 112 through resistors 152, 154, 156, and are connected to the total potential through the switches 58, 52, 40. Further, the terminals of the resistors 140, 152, 154, and 156 on the side of the microcomputer 112 are connected to the total potential through a capacitor to constitute a low-pass filter dedicated to noise reduction.

As described above, the switch 58 is a switch provided near the rear of the upper connector terminal 56 for starting charging. When the switch 58 is turned on, the high level signal is input from the node N _c to the signal input terminal RA _{4 of the} microcomputer 112. When the electric drive tool 10 is mounted on the charging unit 70 and the switch 58 is turned off, the potential of the node N _c becomes a low level, and the low level signal is input to the signal input terminal RA _{4 of the} microcomputer 112. When the microcomputer 112 inputs a signal of a low level to the signal input terminal RA ₄ , in response to this, control of the charging operation of the EDLC 50 is started.

As described above, the switch 52 is a microswitch 52 for starting the lock which is switched in conjunction with the trigger 38 (Fig. 2). When this switch 52 is turned on, the high level signal from the node N _d is input to the signal input terminal of the microcomputer ₆ RA 112. When the trigger 38 is buckled and the switch 52 is turned off, the potential of the node N _d becomes a low level, and the low level signal is input to the signal input terminal RA _{6 of the} microcomputer 112. When the microcomputer 112 inputs a signal of a low level to the signal input terminal RA ₆ , in response thereto, the drive control of the motor 46 is started.

The switch 40 is a brake switch (FIG. 2) provided between the bit holder 14 and the clutch 44. Normally, the switch 40 is turned on, and the high level signal is input from the node N _e to the signal input terminal RA _{7 of the} microcomputer 112. In the screw shackle action, when the screw is positioned and the load torque reaches a predetermined value, the switch 40 is turned off, the potential of the node N _e becomes a low level, and the low level signal is input to the signal input terminal RA of the microcomputer 112. ₇ . When the microcomputer 112 inputs a signal of a low level to the signal input terminal RA ₇ , in response thereto, the rotational driving of the motor 46 is stopped. Motor 46 is a DC motor with a brush attached.

In the control unit 110, in order to control the rotation operation of the motor 46, between the positive power source line 114 and the negative power source line 116, the motor 46 and the forward/reverse switching switch 160 and the switching element such as the FET 162 are connected in series. In the forward/reverse switching switch 160, the first and second positive fixed contacts S _c , S _f and the positive power supply line 114 are connected in common, and the first and second negative fixed contacts S _d , S _e and FET 162 The positive terminals are connected in common, and the first and second movable electric shocks S _a , S _b are respectively connected to the two terminals of the motor 46. The two movable contacts S _a , S _{b are} selectively switched to a position (such as a forward rotation position) connected to the first fixed contact (S _c , S _e ) in accordance with the operation of the slide switch 54 (Fig. 2). Or one of the positions (reverse positions) connected to the second fixed contacts (S _d , S _f ). The negative terminal of FET 162 is connected to the negative supply line (ie, the total potential).

The gate terminal of the FET 162 is connected to the signal output terminal RB _{3 of the} microcomputer 112 through the resistor 164, and is connected to the total potential through the resistor 166. With the signal output terminal RB _{3 of the} microcomputer 112, when the high level signal is output, the FET 162 is turned on, and by the signal output terminal RB ₃ , when the low level signal is output, the FET 162 is turned off. As will be described later, the microcomputer 112 performs switching control in a pulse width control (PWM) manner according to the voltage level of the motor driving voltage from the EDLC 50, or maintains a continuous on state.

A switching element such as FET 168 for controlling the power generation braking of the motor 46 is connected between the positive fixed contact S _c , S _{f of the} forward/reverse switching switch 160 and the negative fixed contact S _d , S _e . When the motor driving FET 162 is turned from the energized state to the off state, a closed circuit is formed between the motor 46 and the FET 168 through the forward/reverse switch 160. Microcomputer 112 by the signal outputted from the signal output terminal RB _1, through resistor 170, 172 by the drive circuit and the NPN transistor 174 composed of FET168 switching control.

The control unit 110 is provided with a power supply voltage detecting circuit 176 for detecting the potential or voltage on the positive power source line 114 at any time. The power supply voltage detecting circuit 176 sequentially inputs a resistor divider circuit composed of a PNP type transistor 178 and resistors 180, 182 between the positive power source line 114 and the total potential, and a node N _f between the voltage dividing resistors 180, 182. The divided voltage (detection voltage) obtained by the above is converted into a digital signal by the A/D converter 184 and input to the signal input terminal RA _{0 of the} microcomputer 112. The resistors 186, 188 and the NPN type transistor 190 constitute a driving circuit that drives the PNP type transistor 178 by the signal output from the signal output terminal RA ₁ by the microcomputer 112. Resistor 192 and capacitor 194 form a low pass filter for reducing noise. The PNP type transistor 178 constitutes a switching circuit that is electrically connected or disconnected between the positive power source line 114 and the power source voltage detecting circuit 176. During the closing of the switching circuit 178, no current flows through the resistor dividing circuit (180, 182), which saves power consumption.

Two (two-color) light-emitting diodes (LED) 196, 198 constituting the state display lamp 30 (Fig. 1) are connected to the signal output terminals RB ₆ and RB ₇ of the microcomputer 112. With signal output terminal RB _6, when a high level signal is outputted, LED196 through resistor 200 is energized, emits light in the green and the like. With signal output terminal RB _7, when the high level signal is outputted, LED196 through resistor 198 is energized, emits light in the red or the like.

Next, the main role of this control unit 110 will be described. First, the effect of charging the EDLC 50 will be described. As described above, when the electric drive tool 10 is mounted to the charging unit 70 to cause the switch 58 to be turned off, the microcomputer 112 responds to this and starts control of the charging operation.

In this charging operation, the microcomputer 112 turns the FET 118 on or off in a certain cycle (for example, 1 second) and a certain load (for example, 90%). While the FET 118 is on, the charging current is supplied from the charger 78 to the EDLC 50, and the charging voltage of the EDLC 50 rises directly. While the FET 118 is off, the charging current is not supplied from the charger 78 to the EDLC 50, and the charging voltage of the EDLC 50 does not rise.

The microcomputer 112 causes the voltage monitoring circuit 120 to monitor the voltage _ED between the EDLC terminals by the signal output terminal RB ₄ while the FET 118 is turned off by the signal output terminal RB ₄ . In this case, as shown in FIG. 15, after FET118 closed, not immediately but after a certain delay time t _d, so that optocoupler 124 is turned on before the voltage monitoring circuit 120 is connected to the two terminals 51a EDLC50, On 51b.

In general, EDLC is a method in which activated carbon particles containing an electrolyte are filled so as to overlap between electrodes, and all the particles are not uniformly charged, and when charging is performed to some extent, particles that have been charged are generated. A charging reaction (diffusion) that discharges to particles that are not sufficiently charged. Due to such a diffusion phenomenon, if the charging is suddenly stopped before the charging is completed, as shown in the fifteenth floor concept diagram, the inter-terminal voltage V _{ED of the} EDLC 50 cannot be maintained and starts to fall (falls off). Therefore, if the voltage monitoring circuit 120 is monitored immediately after the FET 118 is turned off, a monitoring result of the surface EVLC terminal voltage V _ED reaching the maximum rated voltage V _S (error due to an error) may be generated, and the microcomputer 112 may accept such a result. The charging operation is terminated by monitoring the result. Further, when the charging operation is ended, the on/off cycle of the FET 118 is stopped, and the FET 118 is kept in the off state.

In this type of embodiment, after FET118 closed, after a predetermined time t _d, in the EDLC inter-terminal voltage V _ED steady state, the voltage monitoring circuit 120 monitors, therefore, can indeed reach the end point of the fully charged charge The charging voltage of the EDLC 50 immediately after the end of charging is made to coincide with the maximum rated voltage V _S . The EDLC50 can be charged quickly, so it takes only 10 to 15 seconds from the start of charging to complete the charging.

In the voltage monitoring circuit 120, before the inter-terminal voltage V _{ED of the} EDLC 50 reaches the maximum rated voltage V _S , the switching element in the shunt regulator 130 of the rated voltage detecting circuit 122 is turned off, so the optocoupler 128 is also turned off. A high-level signal is obtained at the node N _b of the output circuit (binary signal generating circuit). When the inter-terminal voltage V _{ED of the} EDLC 50 reaches the maximum rated voltage V _S , the switching element in the shunt regulator 130 is turned on (becomes in an on state), whereby the optocoupler 128 is also turned on, in the output circuit (binary signal) A signal of low level is obtained on the node N _b of the generating circuit. During the period in which the monitoring is stopped, that is, during the period in which the photocoupler 124 is turned off, no current flows through the resistance dividing circuit (132, 134), so that power consumption is small.

Fig. 16 and Fig. 17 show a modification of the EDLC charging/EDLC voltage monitoring method of this embodiment.

The technique of Fig. 16 is to gradually increase the ratio of the period T(T _i , T _i+1 , ..) as the number of times of the on/off cycle of the FET 118 increases. That is, during charging, the ratio (load) during the turn-on period is made larger, the efficiency of EDLC charging is prioritized, and the ratio of the off period is increased (and the delay time t _{d is} also increased) near the end of charging. In this way, the accuracy or reliability of the EDLC voltage monitoring can be ensured first.

The technique of Fig. 17 is to gradually shorten the cycle period C (C _i , C _i+1 , ..) as the number of repetitions of the ON/OFF cycle of the FET 118 increases. Also in this case, the time interval of the EDLC voltage monitoring is shortened at the stage near the end of charging, whereby the accuracy of the end of charging detection can be improved.

Moreover, the cycle C (C _i , C _i+1 , ..) of the cycle can be gradually shortened as the number of repetitions of the ON/OFF cycle of the FET 118 increases, and the period T (T _i , T _i+1 , ..) is gradually increased. ratio.

Further, the microcomputer 112 monitors the voltage on the power supply voltage line 114 through the power supply voltage detecting circuit 176 immediately after the charging operation of the EDLC 50 is started. In other words, during charging, the power supply voltage detecting circuit 176 can detect the output voltage of the charging circuit 78 through the power supply voltage line 114. Even if the electric drive tool 10 is correctly mounted on the charging unit 70, when the charging circuit 78 fails or the plug of the power supply line 80 is not inserted into the outlet of the commercial alternating current power supply, power is not supplied from the charging unit 70. At this time, since the voltage of the power source voltage line 114 becomes an abnormally low value, the microcomputer 112 detects the abnormal state through the power source voltage detecting circuit 176, and causes the red light-emitting diode 198 for warning to emit light. When there is no such abnormal state, the voltage on the power supply voltage line 114 exceeds a certain value. Therefore, the microcomputer 112 regards it as EDLC charging normally, and causes the green light emitting diode 196 to emit light. In this case, the green light-emitting diode 196 can be made to blink during charging, and becomes continuously lit after the end of charging.

Next, the operation of the control unit 110 after the EDLC charging is completed will be described. As described above, when the EDLC charging of the electric drive tool 10 is ended, the status display lamp 30 (light emitting diode 196) changes from green flashing to continuous lighting, so that any time thereafter can be removed from the charging unit 70. The electric drive tool 10 is used to apply it to the screw lock operation.

When the electric driving tool 10 is pulled out from the driving tool holding portion 76 of the charging unit 70, the opposite operation is performed between the electric driving tool 10 and the charging unit 70, that is, the rewinding between the respective portions is performed according to the original timing. The action of the time. In this case, after the positive connector terminal 56 of the electric drive tool 10 is separated from the positive contact 98R (or 100L) of the charging unit 70, later, the negative connector terminal 60 of the electric drive tool 100 is from the negative terminal of the charging unit 70. Contact 100R (or 98L) is separated. Thereby, even if an abnormal high voltage such as a surge voltage enters the control unit 110, the jump to the total power supply line can be surely performed, so that the circuit elements in the control unit 110 can be safely protected. Also, when the electric drive tool 10 is mounted to the charging unit 70, the negative connector terminal 60 is connected to the positive terminal 98 of the electric drive tool 10 before being connected to the positive contact 98R (or 100L) of the charging unit 70, The negative contact 100R (or 98L) of the charging unit 70 can safely protect the circuit elements in the control unit 110 against abnormally high voltages such as surge voltages.

When the electric drive tool 10 is used, the user depresses the trigger 38, the switch 52 is closed, and the microcomputer 112 responds to cause the FET 162 to open, so that the drive current flows through the motor 46 and rotates the drive motor 46. In this embodiment, as shown in Fig. 18, within the operating range of the output voltage V _ED of the EDLC 50 of the motor 46, an appropriate reference voltage V _F (3.5 volts in the illustrated example) is set. When the output voltage V _{ED of the} EDLC 50 is higher than the intermediate reference voltage V _F , the no-load rotation speed becomes a certain rotation speed (480 rpm in the illustrated example), and the microcomputer 112 uses the PWM control method (variable duty ratio) To switch the FET162. In other words, in the voltage range higher than the intermediate reference voltage V _F , the load-free rotation speed is maintained at the reference speed by increasing the duty ratio of the PWM control as the output voltage V _ED of the EDLC 50 decreases from the maximum rated voltage V _{S .} . The microcomputer 112 can measure the output voltage V _ED of the EDLC 50 through the power supply voltage detecting circuit 176, and determine the duty ratio or pulse width of the PWM control from the voltage load ratio characteristic preset by a tool such as a comparison table. Further, after the intermediate reference voltage _{VF is} divided by the output voltage V _{ED of the} EDLC 50, the FET 162 is kept in the on state, and the EDLC output voltage V _ED is supplied to the motor 46 at the original direct current (100% duty ratio). Further, a drive current supplied from the EDLC 50 to the motor 46 flows through the bypass diode 115 connected in parallel with the FET 118.

The construction of this type of embodiment, as described above, when the motor driving tool 10 is inserted into the charging unit 70 of the drive tool holding portion 76, EDLC50 in the electric drive tool 10 to be properly fully charged to the maximum rated voltage V _S. Thereby, it is possible to determine that the EDLC voltage is used for the motor drive voltage from the maximum rated voltage V _S after charging without causing damage or failure of the EDLC 50. However, if the PWM control described above is not performed, that is, if the EDLC output voltage V _ED is not always supplied to the motor 46 at a load ratio of 100%, the electric drive tool 10 is used once (for example, dozens of screws are installed). In the screw shackle operation, the fluctuation range of the screw yoke rotation speed (together with the torque) becomes large, which causes a user's use. In this embodiment, in this embodiment, the EDLC voltage adopts a range higher than the intermediate reference voltage V _F , and is uniformly controlled to an average or a certain driving tool rotation speed using the PWM control method described above, so that the yoke can be improved. The stability of the ability (equality, reproducibility). In addition, the microcomputer 112 can monitor the output voltage of the EDLC 50 through the power supply voltage detecting circuit 176, and determine whether the EDLC voltage V _ED is higher or lower than the intermediate reference voltage V _F at ordinary times or at any time. Furthermore, when the EDLC voltage V _ED drops before the lower limit voltage (eg, 2.5 volts) that can be used, the condition can also be detected, and the user is notified through the status display light 30 (eg, the status display light 30 is illuminated red). .

In the one-time screw lock operation, when the screw is positioned and the brake switch 40 is turned off, the microcomputer 112 turns off the FET 162 for driving the motor, and instead, turns on the FET 168 for power generation braking. In this embodiment, the FET 168 is subjected to switching control by a pulse width control method to moderately control the degree of power generation braking or regenerative braking of the motor 46. In addition, FET 118 is turned on during the turn-off of FET 168. Thus, a current flows through the parasitic diode of the FET 162, and energy is returned from the motor 46 to the EDLC 50.

As described above, the electric drive tool 10 of this embodiment has only the built-in EDLC as the power source for the motor drive, and does not have the battery at the same time, so that it can be compact, lightweight, and can be quickly charged and has a long life (no replacement is required). The advantages of the EDLC, such as the battery, that is, the reduction in operating costs, are directly enjoyed as an advantage of the electric drive tool.

Moreover, the EDLC 50 in the electric drive tool 10 is often charged to the maximum rated voltage V _s without excessive or insufficient, so that the EDLC 50 can be prevented from being damaged or malfunctioned due to an excessive charging voltage, and the EDLC 50 can be avoided. If the charging voltage is too small, there is a shortage of shackles in terms of torque or number of uses.

Further, when the electric drive tool 10 is used in the screw lock operation, while the output voltage of the EDLC 50 is higher than the preset intermediate reference voltage V _F , the degree of rotation is maintained at a constant value by the PWM control method. The stability of the screw locking ability.

Further, on the user side, as long as the work is the same, the grip portion 18 is directly gripped to insert the electric drive tool 10 into the drive tool holding portion 76 of the charging unit 70, so that the electric drive tool 10 can be simply placed. In charging mode. Further, after the state display lamp 30 of the electric driving tool 10 is switched from the green blinking state to the continuous lighting (after the charging is completed), if the grip portion 18 of the electric driving tool 10 is gripped to drive it from the charging unit 70 at any time. The tool holding portion 76 is pulled out, and the electric driving tool 10 can be arbitrarily used for the shackle operation. Further, one of the fixed type (Fig. 9) and the wall type (Fig. 10) may be supported by one charging unit 70 (switching use). As described above, the electric drive tool and the electric drive tool device in the above embodiment combine the charging mode and the usage mode, and have comprehensive advantages in use. Even if the charge and discharge cycle is short, the user does not feel distressed, and the original can be improved. The work of the screw shackle operation.

The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiments, and various modifications and changes can be made therein without departing from the scope of the invention. For example, the number of EDLCs accommodated in the electric drive tool 10 can be selected to be arbitrary, and the structure, shape, material, and the like of the respective components constituting the electric drive tool 10 and the charging unit 70 can be arbitrarily modified. For example, the shape and configuration of the connector terminals 56 and 60 on the side of the electric drive tool 10 and the contacts 98R (100L) and 100R (98L) on the side of the charging unit 70 in the above-described embodiment are examples. Use any type of connection terminal. Further, in the charging unit 70, the columnar cylindrical portion 16 of the electric drive tool 10 is housed in the column hole 86 of the tool holding portion 76 in the above embodiment, but the through hole is not limited thereto, for example, A portion of the side wall may be open or may be constructed as a frame. The meshing type in which the electric driving tool 10 is engaged to the charging unit is not limited to the plug-in type in the above-described embodiment, and may be in various types.

Further, in the above-described embodiment, a charge control circuit for controlling the charge voltage of the EDLC 50 is provided in the electric drive tool 10. However, as shown in Figs. 19 and 20, a configuration in which an EDLC charging control circuit is provided on the side of the charging unit 70 may be employed. In this configuration example, the microcomputers 112A and 112B are mounted on the charging unit 70 and the electric driving tool 10, and the microcomputer 112B on the side of the electric driving tool 10 is complicatedly controlled to rotate the motor 46 to the side of the charging unit 70. The microcomputer 112A complexly controls the charging voltage of the EDLC 50. More specifically, as shown in FIG. 19, the charging unit 70 is provided with a microcomputer 112A, a voltage monitoring circuit 120, a switch 58 for charging start, and the like, and is provided with a power supply voltage or an operating voltage. DC/DC converter 144A and voltage regulator 138A. The microcomputer 112A causes the light-emitting diodes 196A, 198A to perform the same operations as the above-described embodiments of the light-emitting diodes 196, 198, respectively, only during charging.

Further, on the side of the electric drive tool 10, the light-emitting diode 196B is a red light-emitting diode, for example, when the voltage V _{ED of the} EDLC 50 is lowered before the usable lower limit voltage. Further, the light-emitting diode 198B is a green light-emitting diode, and is turned on after the brake switch 40 is turned on. 200B is a resistor.

10. . . Electric drive tool

12. . . shell

14. . . drill

16. . . Columnar

18. . . Grip

20. . . Drive tool bit

twenty two. . . Upper ridge

twenty four. . . Upper slit

26. . . Positive sign

28. . . Step difference

30. . . Status display light

32. . . Lower ridge

34. . . Lower slit

36. . . negative

38. . . trigger

40. . . Brake switch

42. . . clutch

44. . . gear

46. . . motor

48. . . Printed circuit board

50A. . . First electric double layer capacitor

50B. . . Second electric double layer capacitor

52. . . Microswitch

54. . . Slide switch

58. . . Microswitch with charging start

70. . . Charging unit

72. . . framework

74. . . Support board (support department)

76R. . . End face

76L. . . End face

78. . . charger

80. . . power cable

82. . . Cable

84. . . Mounting plate

86. . . Cylindrical hole (accommodation)

92. . . Screw

94R. . . Upper right guiding groove

94L. . . Upper left guiding groove

96R. . . Lower right guiding groove

96L. . . Lower left guiding groove

102R. . . Positive sign

102L. . . negative

104R. . . negative

104L. . . Positive sign

110. . . Control department

112, 112A, 112B. . . Microcomputer

118. . . FET (switch circuit)

120. . . Voltage monitoring circuit

124. . . Optocoupler

162. . . FET (switching element)

176. . . Power supply voltage detection circuit

196,198. . . Light-emitting diode

112A, 112B. . . Microcomputer

A. . . arrow

98R. . . Upper right side contact (unit connection terminal)

98L. . . Upper left contact (unit connection terminal)

100R. . . Lower right side contact (unit connection terminal)

100L. . . Lower left contact (unit connection terminal)

60. . . Lower connector terminal (driver connection terminal)

76. . . Drive tool holding portion (drive tool engagement portion)

56. . . Upper connector terminal (drive tool connection terminal)

122. . . Rated voltage detection circuit (reference voltage detection circuit)

Fig. 1 is a perspective view showing the appearance of an electric drive tool according to an embodiment of the present invention.

Fig. 2 is a schematic exploded perspective view showing the arrangement of main components or mechanisms housed in the electric drive tool of the embodiment.

Fig. 3 is a side view showing a state in which a charging type unit of a fixed type is used in the electric drive tool of the embodiment.

Fig. 4 is a plan view corresponding to the side view of Fig. 3.

Fig. 5 is a right side view corresponding to the side view of Fig. 3.

Fig. 6 is a side view showing a state in which a wall-mounted type of charging unit is employed in the electric drive tool of the embodiment.

Fig. 7 is a plan view corresponding to the side view of Fig. 6.

Fig. 8 is a left side view corresponding to the side view of Fig. 6.

Figure 9 is a side elevational view showing the type of use of the fixed type associated with the charging unit of the electric drive tool of the embodiment.

Fig. 10 is a side elevational view showing the wall-mounted type of use of the charging unit in the electric drive tool of the embodiment.

Fig. 11 is a view showing a first order of the relative positional relationship of each part when the electronic connection between the electric drive tool and the charging unit is established in the embodiment.

Fig. 12 is a view showing a first order of the relative positional relationship of each part when the electronic connection between the electric drive tool and the charging unit is established in the embodiment.

Fig. 13 is a view showing a first order of the relative positional relationship of each part when the electronic connection between the electric drive tool and the charging unit is established in the embodiment.

Fig. 14 is a view showing the circuit configuration of a control unit mounted on an electric drive tool of an embodiment.

Fig. 15 is a waveform diagram showing waveforms of respective portions generated by the EDLC charging control method of the embodiment.

Fig. 16 is a waveform diagram showing a modification of the EDLC charging control mode of the embodiment.

Fig. 17 is a waveform diagram showing another modification of the EDLC charging control mode of the embodiment.

Fig. 18 is a graph showing the voltage-to-loadless rotational speed characteristic relationship generated by the motor drive control method using the PWM control method in the embodiment.

Fig. 19 is a view showing the configuration of a main circuit provided on the side of the charging unit in the control unit in one of the modifications of the embodiment.

Fig. 20 is a view showing the configuration of a main circuit provided on the side of the electric drive tool in the control unit in one of the modifications of the embodiment.

10. . . Electric drive tool

12. . . shell

14. . . drill

16. . . Columnar

18. . . Grip

20. . . Drive tool bit

twenty two. . . Upper ridge

twenty four. . . Upper slit

26. . . Positive sign

28. . . Step difference

30. . . Status display light

32. . . Lower ridge

34. . . Lower slit

36. . . negative

38. . . trigger

Claims (16)

An electric driving tool comprising: a bit holder for supporting a driving tool bit in a detachable manner; a motor for rotationally driving the bit holder; an electric double layer capacitor for supplying the motor to the motor; and a driving tool connecting terminal for the above An electric double layer capacitor is electrically connected to an external DC power source; a control unit controls a charging voltage of the electric double layer capacitor and controls a rotation operation of the motor; and an outer casing that houses or supports the bit holder, the motor, and the electric a double layer capacitor, the driving tool connection terminal, and the control unit; wherein the control unit includes: a first switching circuit that is connected in series to the DC power source and the electric double layer capacitor; and a voltage monitoring circuit that is configured to the DC power source and the An electric double layer capacitor is connected in parallel; and a charging control circuit is configured to enable the first switching circuit to be turned on in order to cause the DC power supply to supply a charging current to the electric double layer capacitor, so that the voltage monitoring circuit monitors charging of the electric double layer capacitor Voltage, causing the first switching circuit to be turned off, Stopping charging of the electric double layer capacitor when the state in which the charging voltage of the electric double layer capacitor reaches the first reference voltage is detected by the voltage monitoring circuit, wherein the voltage monitoring circuit switches from the on state of the first switching circuit After the off state, the charging voltage of the electric double layer capacitor is monitored after a predetermined delay time. The electric drive tool according to claim 1, wherein the voltage monitoring circuit monitors a charging voltage of the electric double layer capacitor when a period in which the first switching circuit is turned off is ended. The electric drive tool of claim 1 or 2, wherein the first switch circuit is repeatedly turned on and off in a certain cycle. An electric driving tool comprising: a bit holder for supporting a driving tool bit in a detachable manner; a motor for rotationally driving the bit holder; an electric double layer capacitor for supplying the motor to the motor; and a driving tool connecting terminal for the above An electric double layer capacitor is electrically connected to an external DC power source; a control unit controls a charging voltage of the electric double layer capacitor and controls a rotation operation of the motor; and an outer casing that houses or supports the bit holder, the motor, and the electric a double layer capacitor, the driving tool connection terminal, and the control unit; wherein the control unit includes a first switching circuit that is connected in series to the DC power supply and the electric double layer capacitor, and the control unit controls the first switching circuit The voltage monitoring circuit is connected in parallel to the DC power supply and the electric double layer capacitor in parallel; and the charging control circuit is configured to supply the charging current to the electric double layer capacitor by the DC power supply. The first switch circuit is turned on, in order to make The voltage monitoring circuit monitors the charging voltage of the electric double layer capacitor, so that the first switching circuit is turned off, and when the state in which the charging voltage of the electric double layer capacitor reaches the first reference voltage is detected by the voltage monitoring circuit, the above is stopped. The charging of the electric double layer capacitor, wherein the voltage monitoring circuit increases the ratio of the off period as the number of repetitions of the cycle increases. An electric driving tool comprising: a bit holder for supporting a driving tool bit in a detachable manner; a motor for rotationally driving the bit holder; an electric double layer capacitor for supplying the motor to the motor; and a driving tool connecting terminal for the above An electric double layer capacitor is electrically connected to an external DC power source; a control unit controls a charging voltage of the electric double layer capacitor and controls a rotation operation of the motor; and an outer casing that houses or supports the bit holder, the motor, and the electric a double layer capacitor, the driving tool connection terminal, and the control unit; wherein the control unit includes a first switching circuit that is connected in series to the DC power supply and the electric double layer capacitor, and the control unit controls the first switching circuit The voltage monitoring circuit is connected in parallel to the DC power supply and the electric double layer capacitor in parallel; and the charging control circuit is configured to supply the charging current to the electric double layer capacitor by the DC power supply. The first switch circuit is turned on, in order to make the above The monitoring circuit monitors voltage of the electrical double layer capacitor charging voltage, the upper The first switching circuit is turned off, and when the state in which the charging voltage of the electric double layer capacitor reaches the first reference voltage is detected by the voltage monitoring circuit, the charging of the electric double layer capacitor is stopped, wherein the voltage monitoring circuit follows The increase in the number of repetitions of the above cycle shortens the cycle period. An electric driving tool comprising: a bit holder for supporting a driving tool bit in a detachable manner; a motor for rotationally driving the bit holder; an electric double layer capacitor for supplying the motor to the motor; and a driving tool connecting terminal for the above An electric double layer capacitor is electrically connected to an external DC power source; a control unit controls a charging voltage of the electric double layer capacitor and controls a rotation operation of the motor; and an outer casing that houses or supports the bit holder, the motor, and the electric a double layer capacitor, the driving tool connection terminal, and the control unit; wherein the control unit includes: a first switching circuit that is connected in series to the DC power source and the electric double layer capacitor; and a voltage monitoring circuit that is configured to the DC power source and the An electric double layer capacitor is connected in parallel; and a charging control circuit is configured to enable the first switching circuit to be turned on in order to cause the DC power supply to supply a charging current to the electric double layer capacitor, so that the voltage monitoring circuit monitors charging of the electric double layer capacitor Voltage, causing the first switching circuit to be turned off, Charging voltage of the electric double layer capacitor reaches a first reference voltage when a state detected by the voltage monitoring circuit to stop Charging the electric double layer capacitor, wherein the voltage monitoring circuit has a reference voltage detecting circuit that outputs a signal of a first logic value when the applied voltage is lower than the first reference voltage, and the applied voltage is a signal for outputting a second logic value when the first reference voltage is equal to or higher; and a second switch circuit connected in parallel with the reference voltage detecting circuit; and electronically blocking the reference voltage detecting circuit from the electric double layer capacitor, The second switching circuit is turned off, and the second switching circuit is turned on in order to apply a charging voltage of the electric double layer capacitor to the reference voltage detecting circuit. The electric drive tool of claim 6, wherein the reference voltage detecting circuit has a shunt regulator including a switching element and the switching element is brought into an on state or a non-conducting state according to a voltage level of the applied voltage. a first light-emitting element connected in series with the shunt regulator; the first light-receiving element and the first light-emitting element together form a first optocoupler; and a binary signal generating circuit connected to the first light-receiving And an element generating a signal of the first logic value when the first light receiving element is in a non-conducting state, and generating a signal of the second logic value when the first light receiving element is in an on state; When the voltage of the capacitor is lower than the first reference voltage, the shunt regulator maintains the switching element in a non-conducting state. In the first optocoupler, the light-emitting element does not emit light, the first light-receiving element is kept in a non-conducting state, and the signal of the first logic value is generated by the binary signal generating circuit; When the voltage of the capacitor reaches the reference voltage, the shunt regulator causes the switching element to be in an on state. In the first optocoupler, the light emitting element emits light, and the first light receiving element is in an on state. The binary signal generating circuit generates the second logic value signal; the second switching circuit has: a second light receiving element connected in series with the reference voltage detecting circuit; and a second light emitting element and the second light receiving element together And a second photocoupler that selectively switches the second light receiving element to one of an on state or a non-conduction state by selectively controlling the second light emitting element to be one of a light emitting state or a non-light emitting state. An electric driving tool comprising: a bit holder for supporting a driving tool bit in a detachable manner; a motor for rotationally driving the bit holder; an electric double layer capacitor for supplying the motor to the motor; and a driving tool connecting terminal for the above The electric double layer capacitor is electrically connected to an external DC power source; the control unit controls the charging voltage of the electric double layer capacitor and controls the rotation of the motor; and a housing for housing or supporting the drill holder, the motor, the electric double layer capacitor, the drive tool connection terminal, and the control unit; wherein the control unit includes: a first switch circuit for the DC power source and the electric double The layer capacitor is connected in series; the voltage monitoring circuit is connected in parallel to the DC power source and the electric double layer capacitor; and the charging control circuit is configured to enable the first switching circuit to be turned on to supply the charging current to the electric double layer capacitor. In order for the voltage monitoring circuit to monitor the charging voltage of the electric double layer capacitor to turn off the first switching circuit, when the state in which the charging voltage of the electric double layer capacitor reaches the first reference voltage is detected by the voltage monitoring circuit, Stop charging the electric double layer capacitor; the switching element is connected in series with the electric double layer capacitor and the motor; the voltage detecting circuit detects an output voltage of the motor of the electric double layer capacitor; and the motor control circuit, The above motor produces a rotating torque when When the output voltage of the electric double layer capacitor is higher than the second reference voltage, the no-load rotation speed of the motor is maintained at a predetermined reference rotation speed, and the switching element is controlled to be turned on and off by the pulse width control method. When the output voltage of the double layer capacitor is lower than the second reference voltage, the switching element is kept in an on state. An electric drive tool device having: An electric drive tool according to any one of claims 1 to 8; and a charging unit, a driving tool engagement portion for accommodating or supporting the DC power source, detachably engaged to the electric driving tool, and the DC power source a unit connection terminal electrically and electrically connectable to a drive tool connection terminal of the electric drive tool; and the drive tool connection portion of the electric drive tool is coupled to the drive tool engagement portion by the electric drive tool The unit connection terminals of the charging unit are physically and electronically connected. An electric drive tool device comprising: an electric drive tool having a drill holder for detachably supporting a drive tool drill, a motor for rotationally driving the drill holder, and an electric double layer capacitor for supplying the motor to the motor; a driving tool connection terminal for electrically connecting the electric double layer capacitor and an external DC power source, a first control unit for controlling a rotation operation of the motor, and a housing holder, the motor, the electric double layer capacitor, and the like a driving tool connecting terminal and a casing of the first control unit; and a charging unit for accommodating or supporting the DC power source, detachably engaging the driving tool meshing portion of the electric driving tool, and controlling the electric double of the electric driving tool a second control unit for charging a layer capacitor, and a unit connection terminal electrically connected to the drive tool connection terminal of the electric drive tool and the DC power supply and the second control unit; wherein The second control unit has: a first switching circuit for serially connecting the DC power source and the electric double layer capacitor; a voltage monitoring circuit for parallel connection of the DC power source and the electric double layer capacitor; and a charging control circuit for causing the DC power source to be electrically The double-layer capacitor supplies a charging current to turn on the first switching circuit, and in order to cause the voltage monitoring circuit to monitor the charging voltage of the electric double-layer capacitor, the first switching circuit is turned off, and when the charging voltage of the electric double-layer capacitor reaches the first When the state of a reference voltage is detected by the voltage monitoring circuit, charging of the electric double layer capacitor is stopped; and the driving tool connecting terminal of the electric driving tool and the charging are engaged by the electric driving tool being engaged to the driving tool engaging portion The unit connection terminals of the unit are physically and electronically connected. The electric drive tool device of claim 9 or 10, wherein the drive tool connection terminal of the electric drive tool includes a drive tool connection terminal of a positive electrode and a drive tool connection terminal of a negative electrode, and the unit connection terminal of the charging unit includes a positive electrode The unit connection terminal and the negative unit connection terminal, when the electric drive tool is normally engaged to the charging unit, the unit connection terminal of the negative electrode is before the unit connection terminal of the positive electrode is in contact with the driving tool connection terminal of the positive electrode First, it is in contact with the driving tool connection terminal of the above negative electrode. The electric drive tool device of claim 9, wherein a micro switch is disposed in the vicinity of the drive tool connection terminal or the unit connection terminal, and the electric drive tool is correctly engaged to the charging unit When the tool engagement portion is driven, the unit connection terminal or the drive tool connection terminal opens the micro switch, and in response to the opening operation of the micro switch, starts charging operation of the electric double layer capacitor. The electric drive tool device of claim 9, wherein in the electric drive tool, the outer casing has a columnar portion extending in a direction coaxial with a drive tool bit supported by the drill holder and at least Storing the drill holder, the motor, and the connecting terminal; and the grip portion, which is slightly orthogonal or obtuse from the side of the drill holder and is supported from the columnar portion; in the charging unit, the driving The tool engagement portion has a receiving portion that receives the above-mentioned plug-in from the side of the drill holder in a pluggable manner in a correct state or inclination with respect to the polarity of the drive tool connection terminal and the unit connection terminal The unit connecting terminal is attached to the columnar portion of the casing, and the unit connecting terminal is connected to the driving tool connecting terminal of the electric driving tool. The electric drive tool device according to claim 13, wherein the outer casing has a raised portion that is bulged outward in a radial direction from the columnar portion and extends in a longitudinal direction of the columnar portion. From the side of the drill holder, a slit extending in the longitudinal direction of the columnar portion is formed at least in a front portion of the raised portion, and the driving tool connecting terminal is disposed at a depth of the slit; In the unit, the housing portion of the driving tool engaging portion is provided a guiding groove for guiding a raised portion of the outer casing of the electric driving tool, wherein the unit connecting terminal is disposed in the guiding groove; and a protruding portion of the outer casing of the electric driving tool is guided by the driving tool engaging portion a groove guiding, when the columnar portion of the outer casing of the electric driving tool is inserted into the receiving portion of the driving tool engaging portion, the unit connecting terminal relatively enters the slit of the protruding portion, and is connected to the driving tool connecting terminal In the above electric drive tool, the outer casing has first and second raised portions at different positions on the outer circumference of the columnar portion, and a driving tool connecting terminal of the positive electrode is disposed deep in the slit of the first raised portion. a driving tool connecting terminal of the negative electrode is disposed at a depth of the slit of the second raised portion; and the charging portion of the driving tool engaging portion has first and second guiding grooves for guiding the above In the first and second raised portions, a unit connection terminal of the positive electrode is disposed in the first guiding groove, and a negative electrode is disposed in the second guiding groove a unit connecting terminal; the first and second raised portions of the electric driving tool are respectively guided by the first and second guiding grooves of the charging unit, and the columnar portion of the outer casing of the electric driving tool is inserted into the driving tool to engage In the housing portion of the unit, the unit connection terminals of the positive electrode and the negative electrode of the charging unit are relatively inserted into the slits of the first and second raised portions, and are connected to the driving tool connection terminals of the positive electrode and the negative electrode; In the tool, the first raised portion and the second raised portion have different widths in an outer circumferential direction of the columnar portion of the outer casing; and in the charging unit, the first guiding groove is in the receiving portion The inner circumferential direction has a width corresponding to the first raised portion, and the second guiding groove has a width corresponding to the second raised portion in an inner circumferential direction of the housing portion. The electric drive tool device according to claim 13, wherein in the charging unit, the housing portion penetrates the driving tool engagement portion, and is located at a predetermined position in the vicinity of the first opening of the housing portion of the driving tool engagement portion The guiding groove and the unit connecting terminal are disposed, and the guiding groove and the unit connecting terminal are respectively disposed at a predetermined position in the vicinity of the second opening opposite to the first opening; One of the second openings inserts the columnar portion of the outer casing of the electric drive tool into the receiving portion of the charging unit, and at the same time, each of the unit connecting terminals is connected to the electric device corresponding thereto in the receiving portion Drive tool connection terminal for the drive tool. The electric drive tool device of claim 13, wherein the charging unit is rotatable about a support shaft that is perpendicular to a central axis of the housing portion of the drive tool engagement portion, and the drive tool engagement portion is supported, and With a support that can be fixed at any angle.