EP3600778B1 - Method for operating a fastener driving device - Google Patents

Description

Technical area

The application relates to a method for operating a driving device for fastening elements. Such methods are for example from EP 2 537 640 or US 2009/255972 known.

State of the art

Such devices usually have a driving element for driving in a fastening element arranged in a driving channel and a drive device for the driving element. In devices with a magazine, the fastening elements are transported one after the other into the driving channel with the aid of a transport device. If all of the fastening elements in the magazine have been used up without a user of the driving-in device being aware of this, the user will first try to carry out a driving-in process and only reload further fastening elements after recognizing the empty magazine. It is therefore desirable to operate a driving device in such a way that the time consumed in such unsuccessful driving attempts is reduced.

Presentation of the invention

The object is achieved with a method for operating a driving-in device for fastening elements with a driving-in channel, a driving-in element which is provided for driving a fastening element arranged in the driving-in channel into a substrate, a driving device which is provided for that purpose To drive the driving element on the fastening element arranged in the driving channel, the drive device comprising a motor, a magazine for fastening elements, a transport device which is provided for transporting fastening elements present in the magazine one after the other into the driving channel, and a detection device for querying whether and / or how many fastening elements are present in the magazine, achieved in that the motor is operated according to a standard pattern when the detection device detects a predetermined minimum number of fastening elements in the magazine, and that the motor is operated according to a special pattern deviating from the standard pattern is detected if the detection device does not detect any fastening elements or a number of fastening elements that is below the predetermined minimum number in the magazine, the special pattern being different from the standard pattern sequence differs from individual operating phases with different time intervals and / or different duration and / or different speed of the motor. Due to the deviation of the special pattern from the standard pattern, a user of the driving device immediately recognizes that the fastening elements are used up immediately or after the next driving process and that the magazine needs to be filled. The user recognizes this preferably acoustically and / or haptically.

According to an advantageous embodiment, the special pattern differs from the standard pattern further in terms of a time interval since an event that triggered the operation of the motor. The event that triggers the operation of the motor is preferably the completion of a driving-in process of the driving-in device, switching on of the driving-in device, or lifting of the driving-in device from an underground.

According to an advantageous embodiment, the special pattern differs from the standard pattern further by the duration of the operation of the motor and / or by a speed of the motor.

According to an advantageous embodiment, the driving device comprises a pressing device for querying whether the working device is pressed against a substrate, the pressing device being in a pressing position when the working device is pressed against a substrate. The pressing device preferably only allows the driving element to be driven onto the fastening element in the pressing position.

According to an advantageous embodiment, the motor is operated to drive the drive device to be converted into a ready-to-drive state from which the drive-in element is driven towards the fastening element. The driving device preferably comprises a mechanical energy store, the motor being operated in order to charge the mechanical energy store.

According to an advantageous embodiment, the motor is operated to drive the driving element onto the fastening element.

According to an advantageous embodiment, the motor is an electric motor that is supplied with electrical energy from an electrochemical energy store.

According to an advantageous embodiment, the detection device detects the presence of a fastening element at a predetermined location in the magazine or the drive-in channel.

According to an advantageous embodiment, the transport device has a slide for the fastening elements in the magazine, the detection device detecting a position of the slide.

According to an advantageous embodiment, the detection device interrogates whether and / or how many fastening elements are present in the magazine, capacitively, inductively, magnetically, optically, acoustically or electromechanically.

Embodiments

Fig. 1

ein Aufbauschema einer Eintreibvorrichtung,

Fig. 2

ein Schaltdiagramm einer Eintreibvorrichtung und

Fig. 3

schematisch einen Ausschnitt einer Eintreibvorrichtung.

Embodiments of a device for driving a fastening element into a substrate are explained in more detail below using examples with reference to the drawings. Show it:

Fig. 1

a construction diagram of a driving device,

Fig. 2

a circuit diagram of a driving device and

Fig. 3

schematically a section of a driving device.

Fig. 1 shows a schematic view of a driving device 10. The driving device 10 comprises a housing 20, in which a driving element 100 designed as a piston and a drive device for the driving element 100 are added. The drive device comprises a clutch device 150 held closed by a holding element designed as a pawl 800, a spring 200 with a front spring element 210 and a rear spring element 220, a pulley 260 with a force deflector designed as a belt 270, a front roll holder 281 and a rear roll holder 282 , a spindle drive 300 with a spindle 310 and a spindle nut 320, a gear 400, a motor 480 and a control device 500.

The driving device 10 also has a driving channel 700 for the fastening elements and a pressing device 750. The pressing device allows the driving element 100 to be driven onto the fastening element only in the pressing position. The driving device 10 furthermore comprises a magazine 40 for fastening elements and a transport device which is provided for transporting fastening elements present in the magazine 40 one after the other into the driving channel 700. In addition, the housing 20 has a handle 30 on which a manual switch 35 is arranged. The control device 500 communicates with the manual switch 35 and with several sensors 990, 992, 994, 996, 998, 1000 in order to detect the operating state of the driving device 10. The sensors 990, 992, 994, 996, 998, 1000 each have a Hall probe which detects the movement of a magnet armature, not shown, which is arranged, in particular fastened, on the element to be detected.

The guide channel sensor 990 detects a forward movement of the pressing device 750, which indicates that the guide channel 700 has been removed from the driving device 10. A movement of the pressing device 750 backwards is detected with the pressing sensor 992, which indicates that the driving device 10 is pressed against a substrate. The roll holder sensor detects movement of the front roll holder 281, which indicates whether the spring 200 is under tension. The pawl sensor 996 detects a movement of the pawl 800, which indicates whether the coupling device 150 is held in its closed state. The spindle sensor 998 detects whether the spindle nut 320 or a return rod attached to the spindle nut 320 is in its rearmost position. With a detection device 1000 designed as a slide sensor, it is finally detected whether a slide arranged in the magazine 40 is in its Fig. 1 is the uppermost position in which no fasteners are arranged in the magazine.

After a fastening element has been driven forward, that is to say to the left in the drawing, into a substrate with the aid of the driving element 100, the driving element 100 is in its driving position. The front spring element 210 and the rear spring element 220 are in the relaxed state in which they actually still have a certain residual tension. The front roll holder 281 is in its foremost position in the operational sequence and the rear roll holder 282 is in its rearmost position in the operational sequence. The spindle nut 320 is located at the front end of the spindle 310. Due to the spring elements 210, 220, which are under certain circumstances relaxed except for a residual tension, the belt 270 is essentially load-free.

As soon as the control device 500 has recognized by means of a sensor that the driving element 100 is in its set position, the control device 500 initiates a return process in which the driving element 100 is conveyed into its starting position. For this purpose, the motor 480 rotates the spindle 310 via the gear 400 in a first direction of rotation, so that the non-rotating spindle nut 320 is moved backwards.

The return rods engage in the return pin of the driving element 100 and thus also convey the driving element 100 to the rear. The drive element 100 takes the band 270 with it, whereby the spring elements 210, 220 are not tensioned because the spindle nut 320 also takes the band 270 backwards and releases the same length of band via the rollers of the rear roller holder 282 as the piston between the Rolls of the front roll holder 281 pulls in. The belt 270 thus remains essentially free of load during the retrieval process.

The driving element 100 is then in its starting position and is coupled with its coupling plug part in the coupling device 150. The front spring element 210 and the rear spring element 220 are still in their respective relaxed state, the front roller holder 281 is in its foremost position and the rear roller holder 282 is in its rearmost position. The spindle nut 320 is located at the rear end of the spindle 310. Due to the relaxed spring elements 210, 220, the belt 270 is still essentially load-free.

If the driving device is now lifted from the ground so that the pressing device 750 is displaced forwards with respect to the driving channel 700, the control device 500 initiates a tensioning process in which the spring elements 210, 220 are tensioned. For this purpose, the motor rotates the spindle 310 via the transmission 400 in a second direction of rotation opposite to the first direction of rotation, so that the non-rotating spindle nut 320 is moved forward. The coupling device 150 holds the coupling plug-in part of the drive-in element 100 so that the length of the band, which is drawn in by the spindle nut 320 between the rear rollers, cannot be released by the piston. The roller holders 281, 282 are therefore moved towards one another and the spring elements 210, 220 are tensioned.

The driving element 100 is then still in its starting position and is coupled with its coupling plug part in the coupling device 150. The front spring element 210 and the rear spring element 220 are tensioned, the front roller holder 281 is in its rearmost position and the rear roller holder 282 is in its foremost position. The spindle nut 320 is located at the front end of the spindle 310. The belt 270 deflects the tensioning force of the spring elements 210, 220 on the rollers of the roller holders 281, 282 and transfers the tensioning force to the driving element 100, which is held against the tensioning force by the coupling device 150 becomes. The driving device is now ready for a driving process. As soon as a user pulls the trigger 34, the coupling device 150 releases the driving element 100, which then transfers the tensioning energy of the spring elements 210, 220 to a fastening element and drives the fastening element into the ground.

Fig. 2 shows a control structure of the driving device in simplified form. The control device 1024 is indicated by a central rectangle. The switching and / or sensor devices 1031 to 1033 supply information or signals to the control device 1024, as indicated by arrows. A manual or main switch 1070 of the driving device is connected to the control device 1024. A double arrow indicates that the control device 1024 is communicating with the rechargeable battery 1025. A self-holding 1071 is indicated by further arrows and a rectangle.

A voltage measurement and a current measurement are indicated by further arrows and rectangles 1072 and 1073. A shutdown is indicated by another rectangle 1074 indicated. A B6 bridge 1075 is indicated by a further rectangle. This is a 6-pulse bridge circuit with semiconductor elements for controlling the electric drive motor 1020. This is preferably controlled by driver modules which, in turn, are preferably controlled by a controller. In addition to suitable control of the bridge, such integrated driver modules also have the advantage that they bring the switching elements of the B6 bridge into a defined state when an undervoltage occurs.

A temperature sensor, which communicates with the shutdown 1074 and the control device 1024, is indicated by a further rectangle 1076. Another arrow indicates that the control device 1024 outputs information to the display 1051. Further double arrows indicate that the control device 1024 communicates with the interface 1052 and with a further service interface 1077.

A parking brake, which is activated by the control device 1024, is indicated by a further rectangle 1078. The parking brake 1078 is used to slow down movements when the energy store 1010 is released and / or to keep the energy store in the tensioned or charged state. For this purpose, the parking brake 1078 can interact, for example, with a belt drive or gear (not shown).

A detection device for querying whether and / or how many fastening elements are present in the magazine is indicated by a further rectangle 1079. When the detection device 1079 detects a predetermined minimum number of fastening elements in the magazine, the control device 1024 operates the motor according to a standard pattern in order to bring the drive device into its ready-to-drive state. For example, the motor is started to operate immediately after the driving device has been lifted off a surface after a driving process. If, on the other hand, the detection device 1079 does not detect any fastening elements or a number of fastening elements in the magazine that is less than the predetermined minimum number, the control device 1024 operates the motor according to a special pattern deviating from the standard pattern. For example, after the driving-in device has been lifted off a ground after a driving-in process, it is only started to operate the motor with a delay. Alternatively, the engine is turned off after the Driving device operated from a subsurface after a driving process initially at increased or decreased speed.

Fig. 3 shows a section of a driving device 410 according to a further embodiment. The driving device comprises a magazine 440 and a transport device with a slide 420 for transporting fastening elements 430 in the magazine 440 in a transport direction 425 and a spring element 450, which is designed as a scroll spring, and the slide 420 and thus the fastening elements 430 on a not shown Driving-in channel of driving-in device 410 is subjected to a force.

The driving device 410 further comprises a detection device 460 which detects a position of the slide 420. The detection device 460 comprises an electrical switch 470, which is closed by an actuating element 480 of the slide 420 when the slide 420 is in Fig. 3 has reached the top position. This is preferably the case when the last fastening element present in the magazine 440 is transported into the drive-in channel.

In the exemplary embodiments not shown, the detection device carries out the query as to whether and / or how many fastening elements are present in the magazine, capacitively, inductively, magnetically, optically, acoustically or electromechanically.

The invention has been described using the example of a spring nailer. It is pointed out, however, that the invention can also be used elsewhere. In particular, gas, powder, pneumatically, hydraulically or electromagnetically operated driving devices can be implemented in which a drive device has a combustion-powered, pneumatically operated, hydraulically operated or even electrically operated motor which is operated within the meaning of the invention, for example a driving element according to a Return the driving process to a starting position or drive a fan. The invention can also be used in a screwdriver, in particular a cordless screwdriver.

Claims (14)

1. Method for operating a driving-in device for fastening elements, comprising

   - a driving-in channel,

   - a driving-in element intended for driving a fastening element arranged in the driving-in channel into a substrate,

   - a drive device intended for driving the driving-in element onto the fastening element arranged in the driving-in channel, the drive device comprising a motor,

   - a magazine for fastening elements,

   - a transporting device intended for successively transporting fastening elements that are present in the magazine into the driving-in channel, and

   - a detection device for checking whether and/or how many fastening elements are present in the magazine,

   the method comprising the following steps:

   - operating the motor in accordance with a standard model if the detection device detects a specified minimum number of fastening elements in the magazine,

   - operating the motor in accordance with a special model that deviates from the standard model if the detection means does not detect any fastening elements or detects a number of fastening elements below the specified minimum number in the magazine,

   characterized in that
   the special model differs from the standard model by a different sequence of individual operating phases with a different time interval and/or different duration and/or different speed of the motor.
2. Method according to Claim 1, characterized in that the special model also differs from the standard model by a lapse of time since an event triggering the operation of the motor.
3. Method according to Claim 2, characterized in that the event triggering the operation of the motor is a completion of a process of driving in the driving-in device, an activation of the driving-in device or a lifting-off of the driving-in device from a substrate.
4. Method according to one of the preceding claims, characterized in that the special model also differs from the standard model by a time duration for which the motor is operated.
5. Method according to one of the preceding claims, characterized in that the special model also differs from the standard model by a speed of the motor.
6. Method according to one of the preceding claims, characterized in that the driving-in device comprises a pressing device for checking whether the tool device is pressed against a substrate, the pressing device being in a pressing position when the tool is pressed against a substrate.
7. Method according to Claim 6, characterized in that the pressing device only allows the driving-in element to be driven onto the fastening element when it is in the pressing position.
8. Method according to one of the preceding claims, characterized in that the motor is operated to bring the driving device into a ready for driving-in state, from which the driving-in element is driven onto the fastening element.
9. Method according to Claim 8, characterized in that the driving-in device comprises a mechanical energy store, the motor being operated to charge the mechanical energy store.
10. Method according to one of the preceding claims, characterized in that the motor is operated to drive the driving-in element onto the fastening element
11. Method according to one of the preceding claims, characterized in that the motor is an electric motor, which is supplied with electrical energy from an electrochemical energy store.
12. Method according to one of the preceding claims, characterized in that the detection device detects the presence of a fastening element at a predetermined location in the magazine or the driving-in channel.
13. Method according to one of the preceding claims, characterized in that the transporting device has a slide for the fastening elements in the magazine, the detection device detecting a position of the slide.
14. Method according to one of the preceding claims, characterized in that the detection device carries out the check as to whether and/or how many fastening elements are present in the magazine capacitively, inductively, magnetically, optically, acoustically or electromechanically.

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