JPS6037539B2 - magnetic tape device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape device in which the operating state of the device is switched by the driving force of a motor. The purpose is to reduce the cost of seed equipment and improve its reliability.

Conventionally, in magnetic tape devices that use the driving force of a motor to change the operating state of the device, the driving force of the motor is used to bring the magnetic tape into an operating state, such as playing, fast forwarding, or rewinding, while canceling the operating state. Some devices use a charged spring to do this.

As a configuration for performing this releasing operation, a regulating means for regulating the releasing action is arranged so that the releasing action does not occur even when the force of a charged spring is applied, and a releasing means for releasing the regulating means is further provided. A locking member is used as the regulating means, and a solenoid or a manual operating member for releasing the locking member is used as the releasing means. however,
In this conventional method, in addition to the motor, there is another drive source for starting the release operation, which complicates the device configuration and reduces reliability. There is a drawback that a large impact is generated on the parts, which causes a large impact noise, which significantly deteriorates the quality of the device.

On the other hand, in order to solve the problem of impact noise caused by this spring force, there are examples in which the above-mentioned operation release is also performed following the motor-driven cam, but in this case, the operating state of the device Since the switching is performed in the order assigned to the cams, there is a problem in that the response speed is slow. The present invention provides a device that eliminates the above-mentioned drawbacks, and one embodiment based on the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the device, and one side is the device board.

The magnetic tape device 12 has one end wound around a supply reel 14 and tape guides 16 each fixed to a substrate 10'.
, the erasing head 18 , the tape guide 20 and the green reprinting head 22 , and is wound onto the take-up reel 26 via the tape drive capstan 24 . The pinch roller 28 is rotatably supported by a shaft 32 that stands on one end of a pinch loaf lever 30. A shaft 34 that extends over the substrate 1 rotatably supports a pinch roller lever 30 and a crimping lever 36 located below the pinch roller lever 30, and a protrusion 36a formed at one end of the crimping lever 36. A torsion spring 38 is applied between the pinch roller lever 30 and the one end 30a of the pinch roller lever 30, and is normally biased so that the protrusion 36a supports the one end 30a. A tension spring 42 is stretched between the pin 40 held up on the substrate 101 and the crimping bar 36, and biases the crimping lever 36 counterclockwise so that it is always at a position away from the magnetic tape 10 by a mechanism to be described later. Place the pinch loaf 28 at. A switch cam 44, which has stepped portions 44a and 44b at positions 180 degrees opposite to each other, is integrally fixed to a cam shaft 46, and a switch lever 48 that is attached to the outer periphery of the switch cam 44 is attached to a shaft 50' that is mounted on a base plate 1. This is rotatably supported, and one end 48a is connected to a normally open type microswitch 52.
actuator 52a, and receives a counterclockwise biasing force from it.

The reel 14.26 is configured to be rotatably supported and driven by a reel stand, which will be described later, and a sub-board 54 shown by a broken line is disposed below the board 10. FIG. 2 shows an operation control mechanism arranged on the back side of the substrate 10.

A maximum radius portion 56a and a minimum radius portion 5 are formed on the camshaft 46, which is rotatably supported with respect to the substrate 10 by a bearing (not shown).
A triangular cam 56 having a diameter 6b is integrally fixed.
Cam follower 58, play rack 60, fast forward rack 6
2. The rewind rack 64, the record rack 66, and the differential rods 68, 70, 72, and 74 are each supported by a mechanism (not shown) relative to the substrate 10 so as to be movable in the directions shown by arrows 76 and 78. The cam follower 58 is formed with a square hole including flat parts 58a and 58b that support the triangular cam 56, and a rack part 58 is formed on the side surface of the end.
c, 58d, 58e and 58f are formed, and a projection 58g is further formed. Differential rod 68, 70, 7
Pinions 88, 90, 92 and 94 are rotatably supported on shafts 80, 82, 84 and 86, respectively, which are mounted on shafts 80, 82, 84 and 86, respectively. 588 and 5
It is meshed and engaged with 8f. Rack portions 60a, 62a, 64a are provided on each side of the play rack 60, fast forward rack 62, rewind rack 64, and record rack 66.
and 66a are formed, and these rack portions are meshed and engaged with pinions 88, 90, 92 and 94, respectively. The play rack 601 has a pin 60b that engages with the protrusion 36b of the crimp lever 36 through the hole 61 of the substrate 10 (see FIG. 1) and allows the crimp lever 36 to rotate against the spring 42. Further, pin protrusions 62b and 64b are formed at the tips of the fast-forwarding rack 62 and the rewinding rack 64 to project toward the back side of the figure. Displacement levers 96, 98, 100 and 102 made of soft iron are rotatably supported by shafts 104, 106, 108 and 11, respectively, which are mounted on a base plate 10', and have a stepped portion 96a at one end.
, 98a, 100a and 102a. At the other ends of the displacement levers 96 and 102, tension springs 112 and 116, each having one end fixed to the substrate 10 side, are suspended, and between the ends of the displacement levers 98 and 100, a tension spring 114 is stretched, and the displacement levers 96 and 10 are rotated counterclockwise, and the displacement levers 98 and 102 are rotated clockwise. Stoppers 118, 120, 122 and 124 fixed to the substrate 1 prevent the displacement levers 96, 98, 100 and 102 from rotating, and the other ends of the displacement levers 96, 98, 100 and 102 abut. It looks like this.

Magnetic cores 126, 128, 13 machined from soft iron face each of the displacement levers 96, 98, 100, and 102.
0 and 132 are integrally fixed to the substrate 101 by means not shown, and electromagnetic coils 134, 136, 138 and 1 are attached to each magnetic core so as to surround these magnetic cores.
40 is installed. One of the two lead wires of each of these electromagnetic coils is commonly connected to the terminal 14.
2, and the remaining one each is connected to terminals 144 and 146.
, 148 and 150' are connected to each other. The leaf switch 152 is fixed to the substrate 10' so as to be operated by the protrusion 58g of the cam follower 58, and its contact point is at the position shown in the figure where the flat part 58a of the cam follower 58 touches the maximum radius part 56a of the triangular cam 56. It is connected to close. Gear 15 coaxial with camshaft 46
4 is integrally fixed with the triangular cam 56.

Stoppers 156, 158, 16 fixed to the substrate 10
0 and 162 are the above-mentioned differential rods 68, 70, 7, respectively.
The above-mentioned stoppers 18, 120, 122 and 124
are arranged so that one end portions of the racks 60, 62, 64 and 66 described above can abut each other. The arrangement of these stoppers is determined as follows. That is, at the position of the triangular cam 56 in which the maximum radius portion 56a of the triangular cam 56 faces the flat portion 58a of the cam follower 58, the displacement levers 96, 98, 100, and 102 move toward the opposing magnetic cores 126, 128, 130, respectively. and 132, the respective steps 96a, 98alooa and 102a can engage the respective steps 68a, 70a, 72a and 74a of the differential rod. Rods 68, 70, 72 and 7
4 and the racks 60, 62, 64, and 66. The above-mentioned magnetic attraction force is generated by the electromagnetic coils 134, 136, 138 and 14.
This is done by energizing 0'. FIG. 3 shows a plan view of the reel stand drive mechanism and the triangular cam drive mechanism.

The supply reel stand 164 and the take-up reel stand 166 integrally have reel engagers 164a and 166a, respectively.
The rollers are supported rotatably on roller shafts 168 and 170, respectively. Fast forward arm 172 and rewind arm 1
The shafts 74 are rotatably supported around a common axis about a pith 176 planted on the sub-board 54, and shafts 178 and 180 are erected at their respective ends. The fast forward idler 182 has a rubber-lined small-diameter stepped portion 182a and is rotatably supported by the shaft 178, and the rewind idler 184 has a rubber-lined small-diameter stepped portion 184a and is rotatably supported by the shaft 18. There is. Fast forward lever 186 and rewind lever 18
8 are respective shafts 190 and 192 that stand on the sub-board 54;
It is rotatably supported. A pin protrusion 186a is provided at one end of the fast-forwarding lever 186, and a cam surface 186 is provided at the other end.
b is formed, and a tension spring 196 is stretched between the remaining end and a pin 194 established on the sub-board 54, and the fast-forwarding lever 186 is biased to rotate counterclockwise. A pin protrusion 188a is formed at one end of the rewinding lever 188, a cam surface 188b is formed at the other end, and a tension spring 200 is formed between the remaining end and the pin 198 that stands on the sub-board 54.
is stretched, and the rewind lever 188 is urged to rotate clockwise. On the other hand, a tension spring 202 is stretched between the pin projection 186a and the fast forward lever 172, and a tension spring 202 is also stretched between the pin projection 188a and the rewind lever 174.
4 is hung. The pin protrusion 62b of the fast forward rack 62 and the pin protrusion 64b of the rewind rack 64 in the state shown in FIG. 2 are shown in broken lines in FIG. The cam surface 186b comes into contact with the pin protrusion 62b, and the table feed rack 6
Similarly, the rewinding lever 188 receives the biasing force of the spring 200 and its cam surface 188b abuts the pin protrusion 64b, causing the rewinding rack 64 to move. It stops directly in pressure contact with the stopper 122.

In this state, the table feed arm 172 comes into contact with the pin protrusion 186a under the biasing force of the spring 202, and the small stepped portion 182a of the fast feed idler 182 is stopped at a position away from the winding reel stand 166. Similarly, rewind arm 17
4 comes into contact with the pin protrusion 188a under the biasing force of the spring 204, and the small diameter stepped portion 184a of the unwinding driver 184 is stopped at a position away from the supply reel stand 164. Next, the winding lever 206 is moved to a shaft 208 that is mounted on the sub-board 54.
The pinch roller lever 3
A pin 212 that can be connected is set up on one end 30a of the 0. Furthermore, a shaft 21 is attached to the other end of this winding lever 206.
4 is installed, and a rubber idler 216 and a take-up pulley 21 are relatively rotatable about this shaft 214 as a common shaft.
8 are rotatably supported. Note that the rubber idler 216 and the take-up pulley 218 are assembled by a well-known method (not shown).
The relative rotation is performed through a predetermined friction torque. A tension spring 222 is stretched between the take-up lever 206 and a pin 220 that stands on the sub-board 54, and one end 30a of the pinch roller lever 30 shown by the two-dot chain line is in contact with the pin 212. Move the winding lever 2 to the winding position.
06 is rotated counterclockwise in all directions. Note that below the supply reel stand 164 and the take-up reel stand 166, a reel stand rotation stop detection element, which will be described later, is provided. The tape drive motor 224 is fixed to the back surface of the sub-board 54, and a motor pulley 2 is attached to an output shaft 224a protruding from the surface of the sub-board 54.
26 is fixed.

The tape drive capstan 24 is rotatably supported by a radial bearing (not shown) fixed to the substrate 10 (not shown) and a thrust bearing (not shown) fixed to the sub-board 54. A flywheel 228 is integrally fixed concentrically. The belt 230 is the motor pulley 22
6, a take-up pulley 218, a fast-forward idler 182, a rewind idler 184, a flywheel 228, and then return to a motor pulley 226. Next, the triangular cam drive mechanism will be explained. Pulley 250 is small gear 252
The shaft 25 is integrated with the same zero and is marked on the sub-board 54.
4 is rotatably supported. The large gears 256 and 4/258 are concentrically integrated, and the small gear 258 meshes with the gear 154 described in FIG. 2, and the large gear 256 meshes with the small gear 252 described above. Substrate 54
It is rotatably supported by a shaft 26 on which it stands. The cam drive motor 262 is fixed to the back surface of the sub-board 54, and the motor pulley 264 is fixed to the output koji 262a protruding from the surface of this sub-board. A belt 266 is stretched between the motor pulley 264 and the pulley 250. Here, the tape drive motor 224 and the cam agitation motor 2
The relationship between the rotation of 62 and the displacement of each member will be briefly explained.

The tape drive motor 224 constantly rotates counterclockwise when the device power switch (not shown) is turned on,
0 in the direction of arrow 268, the tape drive capstan 24 and rewind idler 184 are rotated clockwise, and the fast forward idler 182 and take-up pulley 218 are rotationally driven clockwise. The cam drive motor 262 is started by an operation control circuit (not shown) that is linked to a switch (not shown) that selects the drive state of the magnetic tape, rotates in the direction of the rebound indicator, and drives the belt 266 in the direction of the arrow 270. The gear 254 is rotated in the direction of the rebound indicator. Therefore, the switch cam 44 in FIG. 1 and the triangular cam 56 in FIG. 2 are decelerated and rotationally driven in the counterclockwise direction. The device has the above configuration, and its operation will be explained next.

FIG. 4 shows a plan view of the magnetic tape in the reproducing state.

When the playback condition is selected, the operation control circuit (not shown) described above energizes terminals 142 and 144 as well as cam drive motor 262 of FIG. 3. Therefore, the displacement lever 96
is attracted to the magnetic core 126 and rotates clockwise relative to the shaft 104, so that its stepped portion 96a can engage with the stepped portion 68a of the differential rod 68, and at the same time, the triangular cam 56 and the switch cam 4
4 begins to rotate counterclockwise. However, at this point, the stoppers 118 and 15 explained in FIG.
6 position is set. When the triangular cam 56 rotates, the movement of the lid moving rod 68 in the direction of the arrow 300 is restricted based on the engagement of the step portion 68a, so the pinion 88 rotates around the koji 80 and moves the rack portion 58c of the cam follower. The displacement in the direction of arrow 300 is converted into a displacement of the rack portion 60a of the play rack 60, and the play rack 60 is driven in the direction of arrow 302. On the other hand, in parallel with this operation, the switch lever 48 moves the step portion 44a (the first
(shown in the figure), rotate clockwise to bring the actuator 52a of the microswitch 52 to the state shown by the two-dot chain line, and turn this switch ON'. On the other hand, as the leaf switch 152 is turned off in conjunction with the displacement of the cam follower 58 in the direction of arrow 300, the triangular cam 56 rotates and the tip of the switch lever 48 falls into the stepped portion 44b of the switch cam 44, thereby causing the micro The actuator 52a of the switch 52 returns to the position indicated by the solid line in the figure, returning the switch to the OFF state. The above operation control circuit turns off the leaf switch 152.
When the microswitch 52 shifts from ON to OFF in this state, it is determined that the operation for the regeneration operation has been completed, and the power to the cam drive motor 262 is cut off. When this operation is completed, the triangular cam 56 stops at a position rotated 180 degrees from the position shown in FIG.
8 stops at the position moved in the direction of arrow 300. As the play rack 60 moves, the pin 60b presses the bar 36, and the bar 36 is rotated clockwise against the spring 42, causing the protrusion 36a to pinch. One end 30a of the lever lever 30
By separating from the pinch roller lever due to the elasticity of the spring.
30 clockwise to press the pinch roller 28 against the capstan 24 with the tape 12 in between. The pin 2 was in contact with one end 30a of the pinch roller lever 30 due to the clockwise rotation of the pinch roller lever 30.
12 becomes movable, and by the action of the spring 222, the take-up lever 206 rotates counterclockwise about the shaft 208,
A rubber idler 216 is brought into rolling contact with the winding IJ-roll table 166. Therefore, the magnetic tape 12 is driven by the tape drive motor 224.
Capstan 24 and pinch roller 2 being rotated from
8 at a constant speed in the direction of arrow 303, and is wound onto a constant torque take-up reel based on the frictional torque between the take-up pulley 218 and the rubber idler 216. As the magnetic tape 12 runs, the recording head 22 (shown in FIG. 1) reproduces the signal from the magnetic tape, and cooperates with a reproducing circuit (not shown) to obtain a reproduced signal. The operations of the racks other than the play rack 60 when transitioning to the playback state described above will be described below. As explained in FIG. 3, the fast feed rack 62 receives the biasing force of the spring 196 from the fast feed lever 186. Therefore, since the differential rod 70 is not regulated by the displacement member 98 due to the movement of the cam follower 58, it is moved in the same direction as the cam follower 58, and brought to the position shown in FIG. It remains at the position shown in the figure and is not moved at all. This operation is performed by the unwinding rack 64 in FIG.
It is also the same machine, and the rewinding rack 64 is not displaced either. As will be described later, the record rack 66 is also subjected to an urging force in the direction of the arrow 300 in FIG. 4, so it is not displaced in the same way. As is clear from this explanation, in contrast to the electromagnetic coils 134, 136, 138, and 140' shown in FIG. 2, the racks corresponding to the electromagnetic coils that are not energized do not displace. Next, the operation when switching from the above-mentioned reproduction state to the stop state will be explained.

When the stop state is selected from the regeneration state, the above-mentioned operation control circuit energizes the cam drive motor 262 again to rotate the triangular cam 56 in FIG. 4 in the counterclockwise direction. Then, the cam follower 58 is moved in the direction of the arrow 302 and moves to the regeneration state described above for operation, and the pinch roller 28 and rubber tire 216 change from the state shown in FIG. 4 to the state shown in FIG. 3 or FIG. The state shown in is restored. on the other hand,
When the switch cam 44 also rotates 180 degrees counterclockwise from the position shown in FIG. 4 and reaches the position shown in FIG. The state changes from OFF to ON. The operation control circuit determines that the stop operation is complete when the microswitch 52 moves from ON to OFF while the leaf switch 152 is in the ON state, and cuts off the power to the cam drive motor 262 and at the same time turns off the power to the fin magnetic coil 134. cut off. When this stop operation is completed, the triangular cam 56
Also, each member such as the rack is returned to the position shown in FIG. 2. FIG. 5 shows a plan view of the Hishitaka in a fast-forwarding state of the magnetic tape.

When the fast forward state is selected from the stop state, the electromagnetic coil 13
6 is energized, and the cam drive motor 262 is also energized. Therefore, the displacement lever 98 is attracted to the magnetic core 128,
The stepped portion 98a can engage with the stepped portion 70a of the differential rod 70, and at the same time, the triangular cam 56 and the switch cam 4
4 begins to rotate counterclockwise, and as the cam follower 58 moves in the direction of arrow 78, the differential rod 70 similarly moves in the direction of arrow 78.
However, since it is stopped by the displacement lever 98 as described above, the pinion 90 moves the rapid feed rack 62 in the direction of the arrow 400 and brings it to the position shown in FIG. In parallel with this operation, the microswitch 52 is turned on by the switch cam 44 and the leaf switch 152 is turned off by the cam follower 58 in the same way as at the start of the above-described regeneration operation. While the fast-feeding rack 62 is moving, the pin protrusion 62b is pressed against the fast-feeding lever 18.
6 and rotates the fast-forwarding lever 186 clockwise about the shaft 190, thereby causing the spring 20
2, the fast feed arm 172 similarly moves clockwise.The small diameter stepped portion 182a of the fast feed arm 182
66, and then the fast-forwarding lever 186 is still rotated clockwise, its pin protrusion 186a is separated from the fast-forwarding arm 172, and the fast-forwarding idler 182 is pressed against the winding roll table 166 by the elastic force of the spring 202. . Therefore, the take-up reel table 166 is rotated counterclockwise by the fast-forward idler 182 rotated by the tape drive motor 224 to drive the take-up reel 26, and the magnetic tape 12 is rotated in the direction of the arrow 402 than when playing back. drive at high speed.

In addition, in the rapid traverse machine, the microswitch 52 returns to OFF due to the rotation of the triangular cam 56, and the operation control circuit displaces the microswitch 52 from ON to OFF with the leaf switch 152 in the OFF state, thereby performing rapid traverse operation. The cam drive motor 26 is determined to have completed the operation.
2, the triangular cam 56 is rotated 180 degrees from the position shown in FIG. 2, and the cam follower 58 is moved in the direction of arrow 400 and stopped, as in the case of the above-mentioned regeneration operation state. .

Even when this fast-forwarding operation is performed, the racks other than the fast-forwarding rack 62 are not displaced on the same principle of operation as described in the explanation of the reproduction operation above. The stopping of the fast-forward state is the opposite of the fast-forwarding operation, and this can be understood from the explanation of the above-mentioned stopping action of the playback state.

Next, FIG. 6 shows a plan view of the apparatus in a state in which the magnetic tape is rewound.

When the rewinding state is selected from the stop state, the electromagnetic coil 138 is energized, the differential rack 72 is locked, and the cam follower 58 is moved in the same manner as the transition to the fast forward state described above. The unwinding rack 64 is moved. As a result, the pin protrusion 64b drives the rewinding lever 188 counterclockwise, and the four-stepped portion 184a of the rewinding idler 184 is brought into contact with the supply reel stand 164. Therefore, the supply reel stand 164 and the supply reel 14 are rotated clockwise, and the magnetic tape 12 is driven in the direction of arrow 500. The transition from this rewind state to stop is similar to the stop operation from the previous playback state or the stop operation from the fast forward state. In addition, the record rack 6 shown in FIG.
A recording/reproducing switch (not shown) is connected to 6, and an auxiliary force in the direction of arrow 78 is applied from this switch.

This recording/playback changeover switch moves the record rack 66 in the direction of arrow 76 to switch the circuitry of the device from the playback state to the recording state, just as in a general device.
Further, since the driving of the record rack 66 can be easily understood from the driving operations of the playback, fast forward, and rewind racks described above, a detailed explanation will be omitted. It should also be noted that the procedure for simultaneously driving the record rack 66 and the play rack 60 to bring them into a so-called recording state is also performed by the above-mentioned operation control circuit. The above-mentioned reproduction state selection, fast forwarding state selection, rewinding state selection, recording state selection, and stop state selection can be easily performed by operating a switch or the like that energizes an electromagnetic coil or the like.

Next, when the magnetic tape 12 that is driven to run reaches the end and the reel stand that was sending out the magnetic tape stops, we will explain the configuration and operation for canceling and stopping the operation of the device. .

FIG. 7 is a perspective view showing a reel stand stop detection element located below the supply reel stand 164.

The winding reel stand 166 (see FIG. 3) has a similar configuration. A magnet 800 is integrally provided in the lower part of the supply reel stand 164 by being embedded. On the other hand, the Hall element 804 is inserted into the magnet 8 through the hole 802 of the sub-board 54.
It is attached by means not shown so as to protrude to a height capable of sensing 00'. The energization of this Hall element 804 and the processing of its output signal are performed by the above-mentioned operation control circuit (not shown).
The end of the magnetic tape is detected by the discontinuation of the displacement output for a predetermined period of time, and in the rewinding state, the end of the magnetic tape is detected by the discontinuation of the displacement output from the Hall element (not shown) on the winding roll table side for a predetermined period of time. Configured to detect end-of-tape. FIG. 8 is a time chart showing the operation when the magnetic tape 12 being driven reaches the above-mentioned end of the tape, and this explanation will be given as a representative of the reproduction operation.

Point P on the time axis in the figure is when the regeneration state is selected and the cam drive motor 262 and electromagnetic coil 134 are energized, and point Q is when the operation to bring the regeneration state is completed and the cam drive motor 262 is energized. At this point, the current supply is cut off, and the Hall element 804 generates a displacement output due to the rotation of the supply reel stand 164. Point R is the point at which the magnetic tape 12 reaches the end and the supply reel stand 164 stops, and the Hall element 804
stops the displacement output at this point. Then, at a point S after a predetermined period of time has elapsed from point R, the above-mentioned operation control circuit detects the end of the tape based on the fact that the displacement output of the Hall element 804 has been stopped, and the cam drive motor 262 shown in FIG. After energizing, the triangular cam 56 is rotated counterclockwise as explained in FIG. 4 to perform an operation equivalent to a stopping operation, and when point T is reached, the cam drive motor 2
62 and the electromagnetic coil 134, and the apparatus is brought to the stopped state shown in FIGS. 2 and 3. The above is the case when the end of the tape is reached from the playback state, but if the end is reached from the fast forward or rewind state, the same procedure is followed to bring the tape to the stop state. As is clear from the above description, the magnetic tape device of the present invention has a cam (reference number 56 in the embodiment) which can be freely displaced between the operating position and the return position.
, a motor 262 that drives this cam from the return position to the operating position and from the operating position to the return position in cooperation with the switches 52 and 152 that detect the position of this cam, and a first motor that follows this cam 56. Displacement member (cam follower...
...58), a plurality of second displacement members (play racks ...62, etc.) for switching the device to different operating states, the first and second displacement members, and a rack and pinion mechanism. A plurality of differential members (differential rods, etc. 68, etc.) that are differentially displaced via the . . . 134, etc.).

According to this configuration, switching of the driving state of the magnetic tape can be performed simply by selecting one of the plurality of differential members and regulating the movement of the differential member so that it does not displace. Therefore, its reliability is high, and switching selection of any driving state of the magnetic tape can be performed at substantially the same response speed. Further, according to this configuration, the operation of selectively displacing the second displacement member can always follow and be linked to the displacement of the cam, and therefore the operation of bringing the remounting to the selected operating state, Each operation that cancels the selected operating state and returns the device to the reset state operates in accordance with the above-mentioned cam displacement, so the mechanism operates quietly without generating any impact. There is no need to rearrange a dedicated special drive source to release the operating state. Therefore, by adopting the present invention,
A great effect can be achieved in that it is possible to realize a magnetic tape device that operates quietly, has high reliability, is inexpensive, and has excellent responsiveness.

[Brief explanation of drawings]

Fig. 1 is a plan view of the top surface of the device board of an apparatus according to an embodiment of the present invention, Fig. 2 is a plan view of the operation control mechanism arranged on the back side of the board, and Fig. 3 is a reel stand drive mechanism and triangular cam drive mechanism. Fig. 4 is a plan view of the device in the playback state, Fig. 5 is a plan view of the device in the fast forward state, Fig. 6 is a plan view of the device in the rewind state, and Fig. 7 is a plan view of the device in the rewinding state. A perspective view showing the elements, and FIG. 8 is an operation time chart. 10...Substrate, 12...Magnetic tape,
14... Supply reel, 24... Capstan,
26... Winding roll, 28... Pinch roller, 44...
Switch cam, 52... Micro switch, 54... Sub board, 56... Triangular cam, 58... Cam follower, 60... Play rack, 62... Fast forward rack, 64... ...Rewinding rack, 66...
...Record rack, 68, 70, 72, 74...
・Socket rod, 88, 90, 92, 94...pinion,
96, 98, 100, 102...displacement lever, 13
4,136,138,140... Electromagnetic coil,
152... Leaf switch, 164... Supply reel stand, 166... Winding reel stand, 182...
...Fast forward Aidra, 184... Rewind Idra, 216... Rubber Idra, 224...
...tape drive motor, 230. ．．・．． ．．・Belt, 2
62...Cam drive motor, 266...Belt,
800...Magnet, 804...Hall element. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A cam that is freely displaceable between an operating position and a return position, and a motor that drives the cam from the return position to the operating position and from the operating position to the return position in cooperation with a switch that detects the position of the cam. a first displacement member that reciprocates to follow the cam; a plurality of second displacement members that are movable between an operating position and a return position in order to switch the recording medium drive device to a different operating state; and a plurality of differential members arranged in correspondence with the first displacement member and the second displacement member and interlocked with the first displacement member and the second displacement member through a pinion mechanism and arranged in correspondence with the second displacement member; an electromagnetic device for selectively regulating displacement of the differential member, and selectively displacing the corresponding second displacement member by electromagnetically selecting and regulating the displacement of the differential member. configuring and bringing the device into a selected operating state;
and a magnetic tape device characterized in that each of the operations for canceling the selected operating state and bringing the device back to the rest state operates in accordance with the displacement of the cam.