JPH0633555Y2 - Tape drive mode switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a tape drive mode switching device in a tape recorder.

(Prior Art) As a tape drive mode switching device for switching the tape drive mode in order to set the tape running direction to the forward direction or the reverse direction at the time of recording or reproducing operation, or to rewind or fast-forward the tape, the conventional one is as follows. A pinch roller moving mechanism and a winding side hub drive switching mechanism, which are independent of each other, are provided on each of the left and right pinch rollers and the left and right hubs.

The moving mechanism and the switching mechanism are separately operated by using the operation of the electromagnetic solenoid or the rotating operation of the switching gear.

(Problems to be Solved by the Invention) Since the above-described conventional device is configured by the pinch roller moving mechanism and the hub drive switching mechanism that are independent of each other, the number of components that can be used in common is small, and accordingly, gears, levers, etc. The number of parts is large as a whole.

Further, a microphone switch is used to detect the operating position of the moving mechanism and the switching mechanism, and it is difficult to adjust the detection timing such as a hysteresis in the on / off operation, and measures against dust are troublesome. I have a problem.

The present invention solves such a problem of the conventional device, and enables the movement of the pinch roller and the hub drive switching and the hub drive switching for rewinding and fast-forwarding to be performed by only two members, and The invention is devised so that the operation strokes of these two members are short, and the number of constituent parts is reduced and the device is miniaturized.

(Means for Solving the Problems) A tape drive mode switching device of the present invention is, in an auto-reverse type tape recorder, a first mode switching plate and a second mode switching plate movably provided on a chassis, The first mode switching plate meshes with the traveling switching rack, and the traveling switching gear having a toothless portion that deviates from this meshing meshes with the feed switching rack of the second mode switching plate, and this meshing also. And a feed switching gear having a toothless portion that is separated from each other are integrally formed as a mode switching drive gear on the same axis center, and these toothless portions have mutually different phases, and are used as a mode switching drive gear. The travel switching gear meshes with the travel switching rack, and the toothless portion of the feed switching gear looks into the feed switching rack. Only the mode switching plate reciprocates the feed forward constant-speed reproduction driving, or reverse feed is controlled,
At the time of rewinding or fast-forwarding, the feed changeover gear meshes with the feed changeover rack, and the toothless portion of the traveling changeover gear looks into the traveling changeover rack, so that only the second mode changeover plate is caused by the rotation of the mode changeover drive gear. Is configured to reciprocate to control rewinding or fast-forwarding.

Then, the mode switching plates are arranged substantially vertically in an overlapping manner, and the mode switching operations of the constant speed reproduction traveling, the rewinding and the fast forwarding are performed by the engaging portion of the first mode switching plate and the second mode switching plate. The engagement portion of the mode switching plate engages in the moving direction and these mode switching plates move integrally, so that the travel switching rack and the travel switching gear that have been disengaged from the meshing mesh with each other, Alternatively, the meshing between the feed switching rack and the feed switching gear is restored.

Further, it has an optical sensor for detecting the position of each mode switching plate for controlling the driving and stopping of the mode switching drive gear.

(Operation) During constant-speed regeneration traveling, the traveling switching gear meshes with the traveling switching rack and the toothless portion of the feed switching gear is visible in the feed switching rack, so the second mode switching plate remains stopped. Only the first mode switching plate reciprocates by the rotation of the switching drive gear to control the forward feed or the reverse feed of the constant speed reproduction traveling.

At the time of rewinding or fast-forwarding, the feed switching gear meshes with the feed switching rack, and the toothless portion of the travel switching gear looks into the travel switching rack, so the first mode switching plate is stopped and mode switching is performed. By the rotation of the drive gear, only the second mode switching plate reciprocates to rewind or fast-forward.

As described above, the first mode switching plate is operated by the operation of the single mode switching drive gear to perform the recording / reproducing traveling control, and the second mode switching plate is operated to perform the rewinding or fast-forwarding drive control. Therefore, the control operation is simplified, the mode switching control is accurately performed, and the number of component parts of the device is reduced.

During the switching operation of the recording / reproducing traveling control and the rewinding or fast-forwarding drive control, the first mode switching plate and the second mode switching plate move integrally, so that the mode switching control is accurately performed and the control operation is performed. It is simplified.

Moreover, since these mode switching plates substantially overlap each other in the vertical direction, the stroke in the plate moving direction required for installing the mode switching plates is shortened, which is particularly effective for downsizing the device.

Since the optical sensor is used to detect the position of each mode switching plate for controlling the driving and stopping of the mode switching drive gear, the adjustment work of the control operation can be easily and accurately performed.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.

Fig. 5 is a front view of the main part of the loading mechanism of the tape recorder.
FIG. 7, FIG. 7 and FIG. 8 are side views of the essential parts shown in FIG. 6, and plan views of the essential parts are shown in FIG. 9 and FIG.

A cassette insertion opening 2 is opened in the panel 3 on the entrance side of the chassis 1 (the right side in FIG. 5 and the left side in FIG. 9), and the base portion 5a of the loading chassis 5 that supports the inserted tape cassette 4 has left and right fulcrums. The cassettes 5a of the loading chassis 5 are hinged so as to be vertically rotatable with respect to the base 5a by being pivotally supported by the pins 6 and 7 on the rear side of the chassis 1 (left side in FIG. 5, right side in FIG. 7). ing.

On the right side of the chassis 1, a drive motor 8, a loading drive gear 9, and a worm gear mechanism 10 and a spur gear mechanism 11 that interlock between them are provided.

The loading arm 13 pivotally supported by the vertical pin 12 on the chassis 1 includes an upper arm 15 having a pin 14 and a torque spring 16.
And a lower arm 17 for locking the lower end of the torque spring 16
The upper end of is loaded to lift the loading chassis 5, a pin 14 is engaged with a cam (not shown) formed on the lower surface of the loading drive gear 9, and the upper arm 15 is shown in FIG. In the left-handed extreme position shown in Fig. 7, the torque spring 16 is in the right-handed extreme position shown in Fig. 7, the loading chassis 5 is kept in the cassette attaching / detaching position (eject position), and the upper arm 15 is shown in the right-hand side shown in Fig. 10. In the extreme turning position, the torque spring 16 is in the counterclockwise extreme position shown in FIG. 8, and the loading chassis 5 is in the recording / reproducing standby position (standby position). Each of these positions corresponds to the cam of the loading drive gear 9. Pin 14 of loading arm 13
It is determined by the engagement of.

A cassette moving arm 19 is pivotally supported on the chassis 1 by a vertical pin 18, and an engaging piece 21 capable of engaging with the reel hub 34 on the left side of the tape cassette 4 is locked to the cassette moving arm 19 and provided on the cassette moving arm 19. The cam pin 23 of the loading drive gear 9 is engaged with the cam groove 22.

The tape cassette 4 manually inserted into the loading chassis 5 is pulled into a predetermined position by the cassette moving arm 19 rotating clockwise, and then the loading chassis 5 is lowered toward the standby position. To the eject position, the loading chassis 5 rises, then the cassette moving arm 19 rotates counterclockwise, and the tape cassette 4 is pushed out toward the cassette insertion slot 2. In each of these operations, the loading drive gear 9 moves to the right. It is a structure that is performed by turning or turning counterclockwise.

Next, a tape running direction switching device for switching the running direction of the tape 51 to the left direction or the right direction during recording or reproducing operation, and a tape feed switching device for rewinding or fast-forwarding the tape 51 will be described.

1 to 4 are plan views of the main part of the apparatus at the respective switching positions.

Left and right parts of chassis 1 (upper and lower in FIGS. 1 to 4)
A pair of left and right capstans 54 and 55 are pivotally supported, and each capstan 54 and 55 has a pinion 56 and 57 and a pulley 5 respectively.
8, 59, gears 60, 61 and a flywheel (not shown) are integrally formed.

A pair of left and right hubs 62 and 63 are pivotally supported on the chassis 1, and gears 64 and 65 are integrally formed on the reels 92 and 93, respectively.

A belt 69 is wound around the pulley 68 of the traveling motor 66 attached to the chassis 1 and the pulleys 58 and 59 of the capstans 54 and 55, and the pulleys 58 and 59 are rotated in the directions opposite to each other as indicated by arrows. .

The head plate 71 to which the magnetic head 70 is attached is moved along the guide pin 72 and the fulcrum pins 73 and 74 in the tape running direction (first
The chassis 1 is slidable in the front-back direction (left-right direction in FIGS. 1 to 4) perpendicular to the vertical direction in FIGS.
To be installed.

The pinch roller arms 79 and 80 in which the pinch rollers 75 and 76 are pivotally supported by shafts 77 and 78, respectively, can be swung with the fulcrum pins 73 and 74 as fulcrums.

Rotating arms 83 and 84 that pivotally support the intermediate gears 81 and 82, respectively, are rotatably fitted to the capstans 54 and 55.
Mating 82 with pinions 56 and 57 of capstans 54 and 55,
The rotating arms 83, 84 are moved by springs 85, 86 so that the intermediate gears 81, 82 approach the gear 64 of the hub 62 and the gear 65 of the hub 63, respectively.
Urging the rotary arm 83 or 84 to swing, the intermediate gear 81
To the gear 64 (Fig. 1) and the intermediate gear 82 to the gear 65 (Fig. 2).
Fig.), So that they mesh with each other.

The feed switching arm 87 is pivotally supported on the chassis 1 by a fulcrum pin 88, and a pinion 89 and a gear 90 which are integrated with each other are pivotally supported on the feed switching arm 87, and when the feed switching arm 87 swings to the left, the pinion 89 becomes a hub. 62 gear 64, gear 90 capstan
54 gear 60 meshes with each (Fig. 4), feed switching arm
When 87 swings to the right, the pinion 89 moves to the gear 65 of the hub 63,
The gears 90 mesh with the gears 61 of the capstan 55, respectively (the third gear).
(Fig.)

After the standby position, as shown in FIGS. 1 to 4, the reels 92 and 93 of the tape cassette 4 are connected to their reel hubs 34 and 35.
The tape 51 fitted to the hubs 62 and 63 and pulled out from the reels 92 and 93 passes through the guides 94 and 95 of the tape cassette 4 to become the paths shown in FIGS.

The tape running direction switching device sets the respective operating states to the first
FIG. 2 and FIG. 2 are overall plan views, FIG. 11 and FIG. 12 are principal part plan views, and FIG. 15 is a principal part front view of FIG. 1, respectively.

This device is a rotary arm that axially supports the intermediate gears 81 and 82.
83 and 84, a traveling direction switching plate 97 for swinging the rotating arms 83 and 84 leftward or rightward, and pinch roller arms 79 and 80 pivotally supporting pinch rollers 75 and 76.
And to move the pinch roller arms 79, 80,
It is mainly composed of a traveling direction switching plate 97 as a first mode switching plate and an engaging member 98 described below that engages with the traveling direction switching plate 97.

Travel direction switching plate 97 (Fig. 1, Fig. 2, Fig. 11-Fig.
14 and 15 (shown by solid lines), the guide holes 97a and 97b are guided by the left and right guide pins 100 and 101 so as to be slidable in the left and right direction with respect to the chassis 1, and the traveling direction switching plate 97 is provided. Includes the engaging portion 83 of the rotating arms 83 and 84.
A traveling cam mechanism c composed of a and 84a and a concave surface portion 97c engaging therewith, a cam groove 103 engaging with the pin 102 of the head plate plate 71, and a traveling switching rack 104 (shown by a solid line)
Further, the projection 105 and the slits 106, 107, 108 are provided respectively.

The mode switching gear 40 located above the chassis upper plate 31 is provided with a traveling switching gear 109 and a feed switching gear 110 as one body, as shown in FIGS. A toothless portion 109a is provided in the traveling switching gear 109 that meshes.

As will be described later in the description of the operation after inserting the tape cassette 4 into the loading chassis 5, the toothless portion 109a looks into the traveling switching rack 104 at the standby position, but the tape 51 is recorded and reproduced in the left direction (forward direction). FIG. 1 traveling and second recording / reproducing traveling to the right (reverse direction)
In the figure, the traveling direction switching gear 109 meshes with the traveling switching rack 104, and the traveling direction switching plate 97 is moved to each position.

That is, as shown in FIG. 1, the engaging portion 83 of the left rotating arm 83
a falls into the concave surface portion 97c of the traveling direction switching plate 97, whereby the left intermediate gear 81 moves to the take-up side of the left hub 62.
The hub 62 rotates in the arrow direction by meshing with the gear 64 of the.

The engaging member 98 (shown by dotted lines in FIGS. 1 and 2) is formed by a rod that can swing with the pin 102 of the head plate 71 as a fulcrum, and the left end portion 98a is a left pinch roller arm 79.
The right end 98b on the right side of the pinch roller arm
The projections 80a of 80 are in positions where they can be engaged with each other.

In the position shown in FIG. 1, the engaging portion 84a of the right rotating arm 84 rides on the smooth portion 97d of the traveling direction switching plate 97, and the rotating arm 84 is kept in the counterclockwise extreme position. Gear 65
And the protrusion 84b of the rotating arm 84 pushes the shaft 78 of the pinch roller arm 80 on the right side toward the inner side of the chassis 1,
As a result, the protrusion 80a pushes the right end 98b to rotate the engaging member 98 counterclockwise, and the left end 98a pushes the protrusion 79a toward the entrance side of the chassis 1 to move the left pinch roller arm 79 to the extreme right position. Then, the pinch roller 75 contacts the left capstan 54 via the tape 51.

The tape 51 is recorded / reproduced in the forward direction indicated by the arrow in FIG.

The traveling direction switching plate 97 moves to the right from the forward direction recording / reproducing state of FIG. 1 to move to the engaging portion 84 of the right rotating arm 84.
When a falls into the concave portion 97c, the rotating arm 84 rotates clockwise, the left intermediate gear 82 meshes with the gear 65 of the right hub 63 on the winding side, and the hub 63 rotates in the arrow direction ( (Fig. 2).

At this time, the engaging portion 83a of the left rotating arm 83 has the smooth portion 97d.
Riding arm 83 turns clockwise and left side intermediate gear
81 is separated from the gear 64, and the protrusion 83b of the rotating arm 83 pushes the shaft 77 of the right pinch roller arm 79 to the back side of the chassis 1, whereby the protrusion 79a pushes the left end 98a and the engaging member 98.
Turns clockwise, the right end 98b pushes the protrusion 80a toward the entrance side of the chassis 1 to move the right pinch roller arm 80 to the leftmost extreme position, and the pinch roller 76 moves the tape 51 to the right capstan. Contact 55.

The tape 51 will be recorded and reproduced in the reverse direction shown by the arrow in FIG.

The movement of the traveling direction switching plate 97 to the positions shown in FIGS. 1 and 2 is controlled by detecting the slits 106 and 107 by a transmissive optical sensor S as described later and stopping the drive motor 8.

The tape feed switching device for rewinding or fast-forwarding the tape 51 shows the respective operating states in FIGS. 3 and 4 in an overall plan view, and in FIGS. 13 and 14 in a plan view of relevant parts. It was

This device mainly includes a feed switching arm 87 pivotally supporting a pinion 89 and a gear 90, and a feed switching plate 112 as a second mode switching plate for swinging the feed switching arm 87 leftward or rightward. Composed.

The feed switching plate 112 (indicated by solid lines in FIGS. 3 and 4 and indicated by dotted lines in FIGS. 11 to 14) is provided on the left and right guide pins 100, 1.
Guide holes 112a and 112b are guided by 01 so as to be slidable in parallel with the traveling direction switching plate 97, and the feed switching plate 112 has engaging portions 87a and 87a of the feed switching arm 87.
b, concave portions 112c, 112d, convex portions 112e, 1 which engage with these
A feed cam mechanism F including 12f, a cam groove 113 that engages with the pin 102 of the head plate 71, a feed switching rack 114, a protrusion 115, and slits 116, 117, 118, and 119 are provided, respectively.

The traveling direction switching plate 97 and the feed switching plate 112 are arranged so as to be substantially vertically overlapped with each other.

The feed switching gear 110 that meshes with the feed switching rack 114 is provided with a toothless portion 110a, and the toothless portion 110a looks into the feed switching rack 114 at the above-described forward and reverse recording / reproducing traveling positions. Left and right engaging portions 87a, 8 of the feed switching arm 87
7b both come into contact with the smooth portion 112g of the feed switching plate 112 (FIGS. 11 and 12), the feed switching arm 87 does not tilt in either the left or right direction, and the pinion 89 and the gear 90 do not mesh. The neutral position is reached (Figs. 1 and 2).

The mode switching drive gear 40 rotates clockwise from the above-mentioned FIG. 2, the feed switching gear 110 meshes with the feed switching rack 114, the toothless portion 109a of the traveling switching gear 109 looks into the traveling switching rack 104, and the optical sensor S slits. When the feed switching plate 112 reaches the position shown in FIGS. 4 and 14 for detecting 117, the left engaging portion 87a falls into the left concave portion 112c of the feed switching lever 112 and the right engaging portion 87b. Feeds on the right convex portion 112f, the feed switching arm 87 tilts to the left, the pinion 89 meshes with the gear 64 of the left hub 62, the gear 90 meshes with the gear 60 of the left capstan 54, and the gears 60, 90, The reel 92 on the winding side is rotated at high speed by the power transmission of the pinion 89 and the gear 64, and the tape 51 is fast-forwarded in the direction of the arrow in FIG.

The engaging portions 83a and 84a of the left and right rotating arms 83 and 84 are both on the smooth portion 97d of the traveling direction switching plate 97 and are symmetrical with respect to the left and right center line of the chassis 1, and the protruding portions 83a and 84a are the shafts 7 and 7.
Since both 7 and 78 are pushed evenly to the back side, the pinch roller arms 79 and 80 and the pinch rollers 75 and 76 are located at the back side,
The pin 102 of the head plate 71 is located at the smooth portion 113a of the cam groove 113 of the feed switching lever 112 and the floating portion 103c of the cam groove 103 of the traveling direction switching lever 97, and this position is the frontmost position of the cam groove 103. Since the portions 103a and 103b (recording / reproducing positions shown in FIGS. 1 and 2) are located on the far side, the head plate 71 and the magnetic head 70 are retracted from the positions shown in FIGS. 70 is away from tape 51.

The mode switching drive gear 40 further rotates clockwise from FIGS. 4 and 14, and the feed switching plate 112 moves to the left (the traveling direction switching plate 97 remains stopped at the position shown in FIG. 14). ), The third where the optical sensor S detects the slit 118
When the position shown in FIG. 13 is reached, the right engaging portion 87b falls into the right concave portion 112d of the feed switching plate 112, and the left engaging portion 87a rides on the left convex portion 112e. Arm 87 leans to the right, pinion 89 gears hub 63 on the right
65, the gear 90 meshes with the gear 61 of the right capstan 55, and the power transmission of the gears 61, 90, the pinion 89, and the gear 63 causes the reel 93 on the take-up side to rotate at high speed, and the direction of the arrow in FIG. Then, the tape 51 is rewound.

The magnetic head 10 and the pinch rollers 75 and 76 are separated from the tape 51 as in the case of the above fast-forwarding.

The tape cassette 4 set to the standby position is appropriately controlled to the above-mentioned forward and backward recording / reproducing positions, rewinding and fast-forwarding positions, and the traveling direction switching plate 97, the feeding switching plate 112, and the traveling switching gear while being controlled. Ten
9. The position of the feed switching gear 110 is shown in the expanded state in FIGS. 16 (a) to 16 (f), respectively.

Next, the operation sequence from the insertion of the tape cassette 4 into the loading chassis 5 to the switching to the desired mode will be briefly described.

When the tape cassette 4 is inserted from the cassette insertion slot 2,
The door 25 is pushed upward by the insertion front end portion 4b of the tape cassette 4.

When a loading switch (not shown) is pressed, the drive motor 8 rotates and the worm gear mechanism 10 and the spur gear mechanism 11 rotate the loading drive gear 9 clockwise in FIG. 9, the cassette moving arm 19 rotates clockwise, and the tape cassette 4 moves. When the insertion rear end 4a of the tape cassette 4 is pulled away from the door 25 by being drawn into the cassette receiving portion 5b of the loading chassis 5, the door 25 hangs down to close the cassette insertion opening 2.

When this pulling-in is completed, the cam of the loading drive gear 9 pushes the pin 14 of the loading arm 13, and the loading arm 13 rotates clockwise, whereby the loading chassis 5 descends.

When the tape cassette 4 descends to the standby position, the cassette receiving portion 5b of the loading chassis 5 rotates with respect to the base portion 5a and becomes parallel to the chassis 1. The left and right reel hubs 34 and 35 of the tape cassette 4 are the left hub 62 and the right side. Hub of
63, respectively, and the toothless portion 9a of the loading drive gear 9 looks into the gear 38 of the spur gear mechanism 11.
The clockwise rotation of 13 stops (Fig. 10).

The toothless portion 40a of the mode switching drive gear 40 is looking into the gear 39 of the spur gear mechanism 11 from the eject position (FIG. 9) to immediately before the standby position. The device remains down.

Immediately before the standby position, the protrusion of the loading drive gear 9
9b rotates the protrusion 40b of the mode switching drive gear 40 counterclockwise,
The mode switching drive gear 40 meshes with the gear 9, and thereafter, the mode switching operation is performed by the left rotation of the mode switching drive gear 40.

In the standby position, the slit of the traveling direction switching plate 97
The slit 119 of the feed switch plate 112 and the feed switching plate 112 is the optical sensor S.
Is detected by the traveling direction switching plate 97, the left and right pinch rollers 75 and 76 are separated from the capstans 54 and 55, and the traveling direction switching plate 104 is located at the same position as the rewinding and fast-forwarding shown in FIGS. The position of the traveling direction switching plate 97 remains unchanged with respect to the counterclockwise rotation of the mode switching drive gear 40 and the traveling switching gear 109, which continue to the toothless portion 109a.

Regarding the feed switching plate 112, the pin 102 has a cam groove 113.
Since the inclined portion 113b and the floating portion 103c of the cam groove 103 are engaged, the head plate 71 and the magnetic head 70 are in the retracted position, and the feed switching arm 87 is in the neutral position without tilting to the left or right.

As a result, the tape cassette 4 can be moved upward together with the loading chassis 5 and moved downward from this position to the standby position without any trouble.

Since the feed switching rack 114 meshes with the feed switching gear 110, when the mode switching drive gear 40 rotates counterclockwise from the standby position and the optical sensor S detects the slit 118, the rewinding position shown in FIG. The feed switching arm 87 tilts to the right and the right reel 93 on the winding side rotates at high speed due to the power transmission of the gears 61, 90, the pinion 89, and the gear 65, and the tape 51 is rewound in the direction of the arrow in FIG. Be done.

The magnetic head 70 and the pinch rollers 75 and 76 are separated from the tape 51 as in the standby position.

When the mode switching drive gear 40 further rotates counterclockwise from the rewinding position in FIG. 16B to move the feed switching plate 112 and the optical sensor S detects the slit 117, the fast-forward position shown in FIG. The feed switching arm 87 tilts to the left and the left reel 92 on the winding side rotates at high speed due to the power transmission of the gears 60, 90, the pinion 89, and the gear 64, and the tape 51 is fast-forwarded in the direction of the arrow in FIG. It

When the feed switching plate 112 reaches this fast-forward position,
The protrusion 115 collides with the protrusion 105 of the traveling direction switching plate 97, and the traveling direction switching plate 97 that has been stopped until then.
Is the feed switching plate due to the engaging operation of the protrusions 115 and 105.
16 (c) and FIG. 4 together with 112, and as shown in FIG. 16 (d), the toothless portion 110a of the feed changeover gear 110 looks into the feed changeover rack 114 and runs. The above-mentioned integral movement continues until the travel switching rack 104 of the direction switching lever 97 reaches a position where it starts to mesh with the travel switching gear 109.

When the mode switching drive gear 40 further rotates counterclockwise from the position shown in FIG. 16 (d), only the traveling direction switching plate 97 moves, and when the optical sensor S detects the slit 107, the forward recording / reproducing position shown in FIG. 16 (e). The left rotation arm 83 rotates clockwise, and the reel 92 on the take-up side is driven at a low speed by the power transmission of the pinion 56, the intermediate gear 81, and the gear 64, and the left pinch roller arm 79 rotates right to pinch the roller. 75 contacts the left capstan 54, and the tape 51 is recorded and reproduced in the direction of the arrow in FIG.

The pin 102 is provided at the frontmost portion 103a of the cam groove 103 of the traveling direction switching plate 97 and the floating portion 11 of the cam groove 113 of the feed switching plate 112.
3c is engaged with the head plate 71 and the magnetic head 70 to form a tape.
The magnetic head 70 projects toward the tape 51 and contacts the tape 51.

When the mode switching drive gear 40 further rotates counterclockwise from the position shown in FIG. 16 (e), the traveling direction switching plate 97 continues to move,
When the optical sensor S detects the slit 106, the recording / reproducing position in the reverse direction shown in FIG. 16 (f) is reached, and the right rotating arm 84 rotates counterclockwise and is wound by the power transmission of the pinion 57, the intermediate gear 82, and the gear 65. The reel 93 on the side is driven at a low speed, the pinch roller 76 contacts the right capstan 55 by the left rotation of the right pinch roller arm 80, and the tape 51 travels in the direction of the arrow in FIG.

With the movement of the traveling direction switching plate 97, the pin 102
Engages from the foremost portion 103a to the rearward portion 103d of the cam groove 103, and engages with the leftmost foremost portion 103b at the position of FIG. 16 (f), so that the head plate 71 and the magnetic head 70 are The slack of the tape 51 at the time of switching the contact from the pinch rollers 75 to 76 is thereby reduced.

When unloading the tape cassette 4, immediately before the standby position, the projection 40b of the mode switching drive gear 40 rotates the projection 9b of the loading drive gear 9 counterclockwise to engage the loading drive gear 9 with the gear 38, Next, the toothless portion 40a looks into the gear 39, and thereafter, the mode switching drive gear 40 stops.

Movement of the left and right pinch rollers 75, 76 for switching the running direction of the tape 51 during the recording or reproducing operation to the forward direction or the reverse direction shown in FIG. 1 or 2, and the hub on the winding side. Intermediate gear 81 or 82 for switching drive of 62 or 63
Since the movement of the tape is performed by the sliding operation of the traveling direction switching plate 97 as described above, the tape traveling direction switching device is simplified with a reduced number of constituent parts.

Also, a pinion for rewinding or fast-forwarding the tape 51.
The movement of 89 and gear 90 is controlled by the feed switching plate 11 as described above.
The tape feed switching device has a reduced number of constituent parts because the structure is performed by the sliding operation of 2.

Then, the tape traveling direction switching and the tape feeding switching, which are necessary functions as a tape recorder, are performed by the traveling direction switching plate 97 and the feeding switching plate 112 which are divided and divided into two. Since the two switching plates 97 and 112 are provided so as to substantially overlap with each other in the vertical direction, the space in the longitudinal direction required for disposing these switching plates can be made small.

Moreover, the stroke required for sliding the mode switching plate is about 1/2 of that in the case where the switching plate is composed of only one, and thus, downsizing in both the height direction and the longitudinal direction can be achieved. It can be realized.

As shown in FIG. 15, the illustrated optical sensor S allows light from a light projecting portion S ₁ such as a light emitting diode to pass through the slit of the traveling direction switching lever 97, the hole 121 of the chassis 1 and the slit of the feed switching lever 112. A light receiving section S _{2 such} as a phototransistor receives light to detect the respective positions of the traveling direction switching plate 97 and the feed switching plate 112.

Instead of the transmissive optical sensor S in the illustrated example, a reflective optical sensor may be used.

In the case of this reflection type optical sensor, the slits 106, 107,
A reflector is attached to each position of 108, 116, 117, 118, and 119, and the light projecting section S ₁ and the light receiving section S ₂ are not shown in the drawing in which the light projecting section and the light receiving section are arranged next to each other. It will be replaced with an optical sensor.

The shapes and structures of the traveling cam mechanism C, the feed cam mechanism F, the engaging member 98, and the cam grooves 103 and 113 are not limited to the examples shown in the drawings, and other devices having the same functions as those of the present invention are also applicable to the present invention. It can be applied without any problems.

(Advantages of the Invention) Since the tape drive mode switching device according to the present invention is configured as described above, during constant speed reproduction traveling, the traveling switching gear meshes with the traveling switching rack, and the toothless portion of the feeding switching gear is fed switching. Since the second mode switching plate is stopped, only the first mode switching plate reciprocates by the rotation of the switching drive gear while the second mode switching plate is stopped, and the forward feed or the reverse feed of the constant speed reproduction traveling is controlled. When rewinding or fast-forwarding, the feed switching gear meshes with the feed switching rack,
Since the toothless part of the travel switching gear looks into the travel switching rack,
While the first mode switching plate is stopped, only the second mode switching plate is reciprocally moved by the rotation of the mode switching drive gear to control rewinding or fast-forwarding.

As described above, the first mode switching plate is operated by the operation of the single mode switching drive gear to perform the recording / reproducing traveling control, and the second mode switching plate is operated to perform the rewinding or fast-forwarding drive control. Therefore, the control operation is simplified, the mode switching control is accurately performed, the number of constituent parts is reduced, and the tape drive mode switching device having excellent quality and low cost is obtained.

During the switching operation of the recording / reproducing traveling control and the rewinding or fast-forwarding drive control, the first mode switching plate and the second mode switching plate move integrally, so that the mode switching control is accurately performed and the control operation is performed. Simplified, and
Since these mode switching plates are substantially overlapped with each other in the vertical direction, the stroke of the plate moving direction required for installing the mode switching plates is shortened, and the downsizing of the device is further promoted.

Since the optical sensor is used to detect the position of each mode switching plate in order to control the driving and stopping of the mode switching drive gear, the adjustment work of the control operation can be easily and accurately performed. .

[Brief description of drawings]

The figure shows an embodiment of the present invention, and is shown in FIGS. 1, 2, and 3.
4 and 5 are plan views of the main part of the apparatus at the respective operating positions, FIGS. 5, 7, and 8 are front views of the main part of the loading mechanism of the tape recorder, and FIG. 6 is the main part of FIG. 9 and 10 are plan views of the main part of the loading mechanism,
FIGS. 11, 12, 13, and 14 are plan views of relevant parts of the devising device in respective operating positions, FIG. 15 is a front view of relevant parts of FIG. 1, and FIGS. Up to FIG. 16 (f) are development views of the mode switching plate in each operating position. 1 ... Chassis, 2 ... Cassette insertion port 3 ... Panel, 4 ... Tape cassette 4a ... Rear end of insertion 5 ... Loading chassis, 5a ... Base 5b ... Cassette receiving part 6, 7, 73, 74, 88 ...... fulcrum pin 8 ...... drive motor, 9 ...... loading drive gear 9a, 40a ...... missing tooth portion 10 ...... worm gear mechanism, 11 ...... spur gear mechanism 12, 18 ...... vertical pin 13 ...... low Ding arm 14, 102 ... pin, 15 ... upper arm 16 ... torque spring, 17 ... lower arm 19 ... cassette moving arm, 21 ... engaging piece 22, 103, 113 ... cam groove 23 ... Cam pin, 25 …… Door 34, 35 …… Reel hub 40 …… Mode switching drive gear 51 …… Tape, 54, 55 …… Capstan 56, 57, 89 …… Pinion 58, 59, 68 …… Pulley 60, 61 , 64, 65, 90 …… Gears 62, 63 …… Hub, 66 …… Travel motor 69 …… Belt, 70 …… Magnetic head 71… … Head plate 72, 100, 101 …… Guide pin 75, 76 …… Pinch roller 77, 78 …… Shaft 79, 80 …… Pinch roller arm 9b, 40b, 79a, 80a, 83b, 84b, 105, 115 …… Protrusion 81, 82 ... Intermediate gear 83, 84 ... Rotating arm 83a, 84a, 87a, 87b ... Engaging portion 85, 86 ... Spring, 87 ... Feed switching arm 92, 93 ... Reel, 94 , 95 ...... Guide 97 …… Travel direction switching plate (first mode switching plate) 97a, 97b, 112a, 112b …… Guide hole 97c, 112c, 112d …… Concave part 97d, 112g, 113a …… Smooth part 98 ...... Engagement member, 98a ...... Left end 98b ...... Right end 103a, 103b …… Foremost position 103c, 113c …… Floating part 103d …… Rear part, 104 …… Running switching rack 106, 107, 108, 116 , 117, 118, 119 ... Slit 109 ... Travel switching gears 109a, 110a ... Partly toothless portion 110 ... Feed switching gear 112 ... Feed switching plate (second mode switching plate) 112e, 112f ... Convex portion 113b ...... inclined portion, 114 ...... feed changeover rack C ...... traveling cam mechanism, F ...... feed cam mechanism S ...... light sensor, S ₁ ...... light projecting section S ₂ ...... light receiving portion

Claims (3)

[Scope of utility model registration request] 1. An automatic reverse type tape recorder, wherein a first mode switching plate and a second mode switching plate movably provided on a chassis are meshed with a travel switching rack of the first mode switching plate, Further, the traveling switching gear having a toothless portion that is out of this meshing and the feed switching gear that meshes with the feed switching rack of the second mode switching plate and has a toothless portion that is out of this mesh are In the same axial center, these toothless portions are integrally formed as a mode switching drive gear by making the phases different from each other, and during constant speed reproduction traveling, the traveling switching gear meshes with the traveling switching rack and feed switching is performed. The toothless portion of the gear is seen in the feed switching rack, and the rotation of the mode switching drive gear causes only the first mode switching plate to reciprocate, so that normal speed reproduction traveling can be performed normally. Direction feed or reverse feed is controlled,
At the time of rewinding or fast-forwarding, the feed changeover gear meshes with the feed changeover rack, and the toothless portion of the traveling changeover gear looks into the traveling changeover rack, so that only the second mode changeover plate is caused by the rotation of the mode changeover drive gear. A tape drive mode switching device characterized in that the tape is reciprocally moved to control rewinding or fast-forwarding. 2. The mode switching plates are arranged so as to overlap each other in the vertical direction, and the constant speed reproduction traveling and the rewinding,
The mode switching operation of fast-forward is performed by engaging the engaging portion of the first mode switching plate and the engaging portion of the second mode switching plate in the moving direction so that these mode switching plates move integrally. According to the present invention, the meshing between the traveling switching rack and the traveling switching gear, or the meshing between the feed switching rack and the feed switching gear, which are respectively disengaged from each other, is restored. 1. The tape drive mode switching device according to 1. 3. The tape drive mode switching device according to claim 1, further comprising an optical sensor for detecting the position of each mode switching plate for controlling the driving and stopping of the mode switching driving gear.