JPS6048814B2 - Recording medium drive device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device that drives a recording medium such as a magnetic tape, and more specifically, it improves the utilization efficiency of the drive source built into this device, simplifies the device configuration, and facilitates operation. The purpose of the present invention is to improve operability and reliability, and to provide an inexpensive and compact device that operates while saving energy.

Conventionally, devices that drive recording media such as magnetic tapes require a drive source to drive the recording medium and a drive source to switch and control the drive state.A motor is used for the former, and a motor is used for the latter. generally used a plunger or manual force.

However, systems that use plungers have problems such as increased equipment cost, larger size, power consumption, heat generation, and noise, while systems that rely on manual force have problems with operability.
There are problems in terms of functional expandability. On the other hand, some methods have been adopted in which separate motors are used for both drive sources, or a common motor is used for both drive sources. If the device is made smaller, it is difficult to reduce the cost.Also, in the system using a common motor, the output power is required for switching the drive state while the recording medium is being driven. A large motor must be installed, which increases the size and cost of the device, and furthermore, the mechanism for sharing the drive source described above has a problem of poor reliability.

In this method using a common motor, there is an example in which the motor power is used separately for forward rotation and reverse rotation, and a cam is rotationally driven to sequentially change the drive state of the recording medium during reverse rotation, but in this case, the above drive state Since the switching is performed sequentially, there is a problem in that the response speed is slow. The present invention provides a novel drive device that eliminates the above-mentioned drawbacks of the conventional system, and one embodiment based on the present invention will be described below with reference to the drawings.

1 is a plan view of the device, and 10 is the device board. One end of the magnetic tape 12 is wound around a supply reel 14, and each tape guide 1 is fixed to a substrate 10.
6, the tape comes into contact with the erasing head 18, the tape guide 20, and the recording/reproducing head 22, and is wound around the take-up reel 26 via the tape drive capstan 24. The pinch roller 28 is rotatably supported by a shaft 32 mounted on one end of a pinch roller lever 30. The shaft 34 installed on the substrate 10 rotatably supports the pinch roller lever 30 and the pressure lever 36 located below the shaft 34, and the protrusion 36a formed at one end of the pressure lever 36 and the pinch roller lever 3
A torsion spring 38 is applied between the protrusion 36a and the one end 30a of the protrusion 36a. Ru. A tension spring 42 is stretched between the pin 40 set on the substrate 10 and the crimp lever 36, and biases the crimp lever 36 counterclockwise, so that it is always kept at a position away from the magnetic tape 10 by a mechanism described later. Position the pinch roller 28. At positions 180 degrees opposite; stepped portions 44a and 4
A switch cam 44 provided with a switch cam 4b is integrally fixed to a cam shaft 46, and a switch lever 48 that abuts the outer periphery of the switch cam 44 is integrally fixed to a cam shaft 46.
is rotatably supported by a shaft 50 set on the substrate 10,
One end portion 48a abuts against the actuator 52a of the normally open type microswitch 5J2, and receives a counterclockwise biasing force from the actuator 52a.

Note that the reels 14 and 26 are configured to be rotatably supported and driven by a reel stand, which will be described later, and a sub-board 54 indicated by a broken line is disposed below the board 10. FIG. 2 shows an operation control beam structure arranged on the sleeve side of the board 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 connected to the board 10, respectively.
It is supported movably in the directions shown by arrows 76 and 78 by a mechanism not shown. cam follower 58
flat parts 58a and 58b that come into contact with the Ξ-angle cam 56;
Rack portions 58c, 58d, 58e, and 58f are formed on the side surfaces of the end portions, and a protrusion 58g is further formed. Differential rod 68,7
Shafts 80, 8 are installed at the mouths, 72 and 74, respectively.
Pinions 88, 90, 92, and 94 are rotatably supported by the racks 58c and 58d of the cam follower 58, respectively.
, 58e and 58f. A rack section 6 is provided on each side of the play rack 60, fast forward rack 62, rewind rack 64, and record rack 66.
0a, 62a, 64a and 66a are formed, and these rack portions are meshed and engaged with pinions 88, 90, 92 and 94, respectively. A pin 60b is embedded in the play rack 60, which engages with the protrusion 36b of the crimp lever 36 through the hole 61 of the board 10 (see FIG. 1) and rotates the crimp lever 36 against the spring 42. and
Furthermore, pin protrusions 62b and 64b are formed at the tips of the fast-forwarding rack 62 and the rewinding rack 64, which project toward the back side of the figure. Displacement levers 96, 98 made of soft iron
1?0 and 102 are rotatably supported by shafts 104, 106, 108 and 110, respectively, which are set on the substrate 10, and have stepped portions 96a, 98a, 100a and 1 at one end.
02a. At the other ends of the displacement levers 96 and 102, tension springs 112 and 116, each of which has one end fixed to the substrate 10 side, are stretched. Tensile spring 114
is stretched, and the displacement levers 96 and 100 are biased to rotate counterclockwise, and the displacement levers 98 and 1 mouth 2 are biased to rotate clockwise. Stoppers 118 and 120 fixed to the substrate 10
, 122 and 124 are the displacement levers 96, 98, 1
? 0 and 102, and also prevents the displacement levers 96 and 9 from rotating.
The other ends of 8, 100 and 102 are brought into contact with each other. A magnetic core 126 machined from soft iron faces each of the displacement levers 96, 98, 1 port 0 and 102,
128, 130, and 132 are integrally fixed to the substrate 10 by means not shown, and each magnetic core has an electromagnetic coil 134, 136,
138 and 140 are attached. One of the two lead wires of each of these electromagnetic coils is connected in common to terminal 142, and the remaining one lead wire is connected to terminal 142.
44, 146, 148 and 150, respectively. 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 the flat part 58a of the cam follower 58 is connected to the triangular cam 56.
The contact point is closed at the position shown in the figure where it comes into contact with the maximum radius portion 56a. A gear 154 coaxial with the camshaft 46 is integrally fixed to the triangular cam 56. Stoppers 156, 158 fixed to the substrate 10,
160 and 162 are the above-mentioned differential rods 68 and 162, respectively.
The above-mentioned racks 60, 62, 64 and 6 are disposed at positions where one end portions of 70, 72 and 74 can come into contact with each other, while the above-mentioned stoppers 118, 120, 122 and 124 are provided with the above-mentioned racks 60, 62, 64 and 6.
6 are arranged so that one end portion of each can be brought into contact with each other. The arrangement of these stoppers is determined as follows.
That is, at the position of the Ξ-angle cam 56 in a state where the maximum radius portion 56a of the king-angle cam 56 faces the flat portion 58a of the cam follower 58, the displacement levers 96, 98, 10 and 102 are arranged to move toward the opposing magnetic cores. 126,128,
When magnetically attracted by 130 and 132 and rotated, the respective step portions 96a, 98a, 100
a and 102a are the respective steps 68a of the differential rod.
, 70a, 72a and 74a and the rack 60,
It is determined to regulate the relative positions of 62, 64 and 66. Note that the above-described magnetic attraction force is generated by energizing the electromagnetic coils 134, 136, 138, and 140. 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 each have a reel engager 1
The reel shafts 64a and 166a are integrally formed and are rotatably supported by reel shafts 168 and 170, respectively, which are mounted on the sub-board 54. Fast forward arm 172 and rewind arm 174
are supported rotatably about a common shaft 176 set on the sub-board 54, and shafts 178 and 180 are set at each end. The fast-forward idler 182 has a rubber-lined small-diameter step 182a and is rotatably supported on the shaft 178, and the rewind idler 184 has a rubber-lined small-diameter step 184a and is rotatably supported on the shaft 180. ing. Fast forward lever 186 and rewind lever 18
8 are respective shafts 190 and 1 installed on the sub-board 54.
92 so as to be rotatable. Fast forward lever 186
A pin protrusion 186a is provided at one end, and a cam surface 1 is provided at the other end.
86b is formed, and a tension spring 196 is stretched between the remaining end and a pin 194 planted on the sub-board 54, and the fast-forwarding lever 186 is urged to rotate counterclockwise. A pin protrusion 188a is provided at one end of the rewind lever 188.
A cam surface 188b is formed at the other end, and a tension spring 2 is provided between the remaining end and the pin 198 planted on the sub-board 54.
00 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-forwarding arm 172, and a tension spring 204 is also stretched between the pin projection 188a and the rewinding arm 174. The pin protrusion 62b of the fast forwarding rack 62 and the rewinding rack 6 in the state shown in FIG.
The pin protrusion 64b of No. 4 is shown in broken lines in FIG. Similarly, the rewinding lever 188 receives the urging force of the spring 200 and its cam surface 188b abuts the pin protrusion 64b, pressing the rewinding rack 64 against the stopper 122. It has stopped.

In this state, the fast feed arm 172 receives the biasing force of the spring 202 and comes into contact with the pin protrusion 186a, and the small diameter stepped portions 18 and 2a of the fast feed idler 182 touch the take-up reel stand 16.
It is stopped at a position away from 6. Similarly, the rewinding arm 174 receives the biasing force of the spring 204 and the pin protrusion 188
a, and the small diameter stepped portion 184a of the rewinding idler 184
is stopped at a position away from the supply reel stand 164. Next, the take-up lever 206 is rotatably supported by a shaft 208 installed on the sub-board 54, and passes through an elongated hole 210 formed in the board 10 (not shown) at one end to connect the pinch roller lever 30. A pin 212 that can come into contact with one end portion 30a is planted.

Furthermore, a shaft 214 is installed at the other end of the winding lever 206, and a rubber idler 216 and a winding pulley 218, which are relatively rotatable, are each rotatably supported using the shaft 214 as a common axis. . Note that the rubber idler 216 and the take-up pulley 218 are configured to rotate relative to each other through a predetermined friction torque using a well-known method (not shown). A tension spring 22 is provided between the take-up lever 206 and the pin 220 planted on the sub-board 54.
2 is stretched, and the winding lever 206 is rotated counterclockwise to a position where one end 30a of the pinch roller lever 30 and the pin 212 come into contact with each other, as indicated by the two-dot chain line.
The motor 224 is fixed to the back surface of the sub-board 54, and a first motor pulley 232 via a one-way clutch is fixed to an output shaft 224a protruding from the surface of the sub-board.
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 centrally fixed integrally. The belt 230 is connected from the first motor pulley 232 to the take-up pulley 218, the fast-forward idler 182, the rewind idler 184, and the fly hole 228.
and then the first motor. It is stretched so as to return to the pulley 232. Next, the triangular cam drive mechanism will be explained. The pulley 250 is concentrically integrated with a small gear 252 and rotatably supported by a shaft 254 mounted on the sub-board 54. The large gear 256 and the small gear 258 are concentric. The gear 154 explained in FIG. 2 and the small gear 258 mesh with each other, and the large gear 256 meshes with the small gear 252 described above. is supported by Output shaft 22 of the above-mentioned motor 224
4a has a second motor pulley different from the first motor pulley 232 mentioned above.
A second motor pulley 234 is similarly attached via a one-way clutch, and this second motor pulley 23:4
A belt 266 is stretched between the pulley 250 and the pulley 250 on a sash i. As shown in FIG. 4, a first motor pulley 232 with a built-in one-way clutch is attached to the motor output shaft 232
When 4a rotates in the direction of arrow 236, it rotates in the same direction, driving belt 230 in the direction of arrow 268.

Also, a second motor pulley 2 with a built-in one-way clutch
34 is an arrow 240 in which the motor output shaft 242a is opposite to the above.
When rotating in this direction, the belt 266 rotates in the same direction.
is driven in the direction of arrow 270. Therefore, the action of each one-way clutch causes the motor output shaft 224a to move in the direction indicated by the arrow 2.
When rotating in the direction of arrow 236, the first motor pulley 232 is driven, and when rotating in the direction of arrow 236, the second motor pulley 234 is not driven. Here, the relationship between the rotation of the motor 224 and the displacement of each member will be briefly explained.

Upon turning on the device power switch (not shown), the motor 224 rotates, typically counterclockwise, driving the belt 230 in the direction of arrow 268, causing the tape drive capstan 24 and rewind idler 184 to rotate counterclockwise. The fast-forward idler 182 and the take-up pulley 218 are rotated clockwise. At this time, the belt 266 is not driven by the action of the one-way clutch. Then, when an operation control circuit (not shown) is operated by operating a switch (not shown) for selecting the driving state of the magnetic tape, the motor 224 is reversely driven to rotate clockwise, and the belt 266 is rotated in the direction of an arrow 270. The gear 254 is driven to rotate counterclockwise. Therefore, the switch cam 44 in FIG. 1 and the king angle cam 56 in FIG. 2 are decelerated and rotationally driven in the counterclockwise direction. At this time, the first motor pulley 232 is separated from the output shaft 224a, so
No rotational force is transmitted to the flywheel 228, and the flywheel 228 idles due to inertia. The device has the above configuration, and its operation will be explained next. FIG. 5 shows a plan view of the apparatus in a magnetic tape reproducing state.

When the regeneration condition is selected, the operation control circuit described above (not shown) energizes terminals 142 and 144 and motor 26.
2, energize it so that it rotates clockwise. Therefore, the displacement lever 96 is attracted to the magnetic core 126 and rotates clockwise with respect 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 second motor pulley 234 From then on, the Ξ-angle cam 56 and the switch cam 44 begin to rotate counterclockwise. However, at this point, the above-mentioned stepped portion 96a
The positions of the stoppers 118 and 156 explained in FIG. 2 are set so that there is a slight gap between the step portion 68a and the step portion 68a. ! When the triangular cam 56 rotates, the movement of the differential rod 68 in the direction of the arrow 300 is restricted based on the engagement of the step portion 68a, so that the pinion 88 moves toward the shaft 8.
0 and converts the displacement of the rack part 58c of the cam follower in the direction of arrow 300 into the displacement of the rack part 60a of the play rack 6.0, and moves the play rack 60 in the direction of arrow 302.
drive in the direction. Meanwhile, in parallel with this operation, the switch lever 48 escapes from the stepped portion 44a (shown in FIG. 1) of the switch cam 44, rotates clockwise, and moves the actuator 52a of the microswitch 52 to the state shown by the two-dot chain line. Set this switch to 0N. On the other hand, in conjunction with the displacement of the cam follower 58 in the direction of arrow 300, the leaf switch 152 is brought into the OFF state. Further, the Ξ-angle cam 56 rotates and the tip of the switch lever 48 falls into the stepped portion 44b of the switch cam 44, so that the actuator 52a of the microswitch 52 returns to the position shown by the solid line in the figure, turning this switch into the OFF state. to be restored. When the microswitch 52 shifts from 0N to 0FF while the leaf switch 152 is in the 0FF state, the above-mentioned operation control circuit determines that the operation for the regeneration operation is completed and stops the motor 224 from rotating clockwise. Switch the current direction so that it rotates counterclockwise. When this operation is completed, the Ξ-angle cam 56 stops at a position rotated by 180 degrees from the position shown in FIG. 2, and the cam follower 58 stops at a position moved in the direction of arrow 300. As the play rack 60 moves, the pin 60b rotates the crimp lever 36 clockwise against the spring 42, and the protrusion 36a separates from the one end 30a of the pinch roller lever 30, thereby increasing the elasticity of the spring 38. Pinch roller lever 3
0 clockwise to move the pinch roller 28 onto the tape 1.
2 and press it against the capstan 24. As the pinch roller lever 30 rotates clockwise, the pin 212 that was in contact with the one end 30a of the pinch roller lever 30 becomes movable, and under the action of the spring 222, the take-up lever 206 is rotated about the shaft 208 as a fulcrum. By rotating clockwise, the rubber idler 216 is brought into rolling contact with the take-up reel stand 166. Therefore, the magnetic tape 12 is driven at a constant speed in the direction of arrow 383 by the capstan 24 and the pinch roller 28 which are rotated by the motor 224, and is wound at a constant torque based on the frictional torque between the take-up pulley 218 and the rubber idler 216. It is wound on a reel. As the magnetic tape 12 travels, the recording/reproducing head 22 (shown in FIG. 1) reproduces signals from the magnetic tape, and a reproducing circuit (not shown)
A reproduced signal can be obtained in cooperation with the above. The operations of the racks other than the play rack 60 when transitioning to the playback state described above will be described below.

As mentioned above, the fast-forwarding rack 62 is connected to the fast-forwarding lever 186.
It receives an additional force from a spring 196. Therefore, the movement of the cam follower 58 causes the differential rod 70 to move toward the displacement member 9.
The cam follower 5 because it is not regulated by 8.
8 and brought to the position shown in FIG. 4, the fast-forwarding rack 62 remains at the position shown in FIG. 2 and is not moved at all. This operation is the same for the unwinding rack 64, and the unwinding rack 64 is also not displaced. As will be described later, the record rack 66 is also subjected to an auxiliary force in the direction of arrow 300 in FIG.
Similarly, it does not change. As is clear from this explanation, it will be understood that racks corresponding to electromagnetic coils that are not energized with respect to the electromagnetic coils 134, 136, 138, and 140 in FIG. 2 are not displaced. 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 switches the rotation direction of the motor 224 again, and rotates the Ξ-angle cam 56 in FIG. 5 in the counterclockwise direction. Then, the cam follower 58 is moved in the direction of the arrow 302, and the pinch roller 28 and the rubber tire 216 are changed from the state shown in FIG. 5 to the state shown in FIG. The state returns to the state shown in the figure.
On the other hand, the switch cam 44 is also moved from the position shown in FIG.
When the microswitch 52 rotates 80 degrees counterclockwise and reaches the position shown in FIG. 1, it changes from 0N to 0FF.
Prior to this, the leaf switch 152 changed from 0FF to 0N.
becomes the state of The operation control circuit changes the micro loss switch 52 from 0N to 0 when the leaf switch 152 is in the 0N state.
By shifting to FF, it is determined that the stopping operation is complete, and the rotation direction of the motors 262, 224 is switched counterclockwise, and at the same time, the power to the electromagnetic coil 134 is cut off. When this stopping operation is completed, the triangular cam 56 and other members such as racks are returned to the positions shown in FIG. 2. FIG. 6 shows a plan view of the apparatus 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 rotational direction of the motor 224 is reversed. Therefore, the displacement lever 98 is attracted to the magnetic core 128, and its stepped portion 98a can engage with the stepped portion 70a of the differential rod 70, and at the same time, the Ξ-angle cam 56 and the switch cam 44 rotate counterclockwise. As the cam follower 58 moves in the direction of the arrow 78, the differential rod 70 similarly tries to move in the direction of the arrow 78, but as described above, it is locked by the displacement lever 98, so the pinion 90 moves toward the rapid feed rack 62. is moved in the direction of arrow 400 and brought to the position shown in FIG. In parallel with this operation, the microswitch 52 is turned ON by the switch cam 44 and the relief 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 1.
86 and rotates the fast-forwarding lever 186 clockwise about the shaft 190, thereby causing the spring 2
02, the fast forward arm 172 is similarly rotated clockwise. In order to
2a is brought into contact with the take-up reel stand 166, and then the fast-forwarding lever 186 is still rotated clockwise and its pin protrusion 1
86a is separated from the fast feed arm 172, and the fast feed idler 182 is pressed against the take-up reel stand 166 by the elastic force of the spring 202.

The rotation of the triangular cam 56 causes the microswitch 5 to
2 returns to 0FF, and the operation control circuit switches to leaf switch 1.
52 is in the 0FF state, the microswitch 52 changes from 0N to 0.
It is determined that the operation for the fast 1 forward operation is completed by the displacement to FF, and the direction of energization to the motor 224 is switched, and the rotation of the motor 224 is reversed, so that the above-mentioned playback operation state As in the case of Ξ angle cam 56
is a position rotated by 180 degrees from the position shown in FIG. 2, and the cam follower 58 stops at a position moved in the direction of arrow 400.

Then, a fast forward operation is performed by reversing the motor 224. 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 above explanation of the stopping action of the playback state.

Next, FIG. 7 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 motor 224 is reversed in an operation similar to the transition to the fast forwarding state described above, and in this case, the electromagnetic coil 138 is energized and the differential The rack 72 is locked and the rewinding rack 64 is moved by the movement of the cam follower 58. As a result, the pin protrusion 64b drives the rewinding lever 188 counterclockwise, and the small diameter stepped portion 184a of the rewinding idler 184 is brought into contact with the supply reel stand 164. Upon completion of this rewinding operation, the motor 224 is reversed again, thereby rotating the supply reel stand 164 and the supply reel 14 in the clockwise direction, driving the magnetic tape 12 in the direction of arrow 500, and performing the rewinding operation. It will be done. The transition from the rewind state to stop is similar to the stop operation from the previous playback state and the stop operation from the fast forward state.

The record rack 66 shown in FIG. 2 is connected to a recording/playback changeover switch (not shown), and an energizing force in the direction of an arrow 78 is applied from this switch.

This recording/playback changeover switch switches the circuitry of the device from the playback state to the recording state in conjunction with the displacement of the record rack 66 in the direction of the arrow 76, 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 driving the record rack 66 and the play rack 60 simultaneously 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.

As is clear from the above description, the recording medium drive device of the present invention includes a first displacement member (cam follower of the embodiment),
A cam that reciprocates the first displacement member with a constant stroke, a plurality of second displacement members (play racks, etc.) that switch the device to different operating states, and the first and second displacement members and the rack. A plurality of differential members (differential rods) that are differentially displaced via a pinion mechanism, and a position that is arranged corresponding to this differential member and between a position where this differential member is locked and a position where this differential member is not locked. a plurality of locking members (displacement levers) that can be freely displaced; and an electromagnetic device (such as an electromagnetic coil) that selectively displaces the plurality of locking members and holds the locking members at the locking position by electromagnetic force. , a recording medium driving member (such as a capstan), and a pair of one-way clutches for transmitting the output of the motor during normal rotation to the recording medium driving member and the output during reverse rotation to the cam. The structure is as follows.

According to this configuration, when switching and controlling the driving state of the recording medium, no load is applied to the motor to drive the recording medium, so the rotational output of the motor can be effectively used, and the device can be made smaller. It is. Furthermore, this switching selection of the drive state of the recording medium can be achieved with a simple mechanism that simply locks the locking member electromagnetically to prevent the corresponding differential member from displacing. It has excellent energy saving properties and reliability. Furthermore, switching to any drive state of the recording medium is performed in the first
This can be done at the same response speed determined by the displacement speed of the displacement member. Therefore, by employing the present invention, it is possible to obtain an excellent effect of producing a device that is small in size, highly reliable, has a fast response speed, and saves energy.

[Brief explanation of the drawing]

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 plan view of the reel stand drive mechanism and the Ξ-angle cam drive. A plan view of the mechanism part, FIG. 4 is a perspective view showing the motor part,
FIG. 5 is a plan view of the device in the playback state, FIG. 6 is a plan view of the device in the fast forward state, and FIG. 7 is a plan view of the device in the rewind state. 10...Substrate, 12...Magnetic tape,
14... Supply reel, 24... Capstan, 26... Take-up reel, 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...Rewind rack,
66... Rucode truck, 68, 70, 72, 7
4... Differential rod, 88, 90, 92, 94.
...Pinion, 96, 98, 100, 102...
...Displacement lever, 134, 136, 138, 140
..... Electromagnetic coil, 152 ..... - Leaf switch, 164 ..... Supply reel stand, 166
......Take-up reel stand, 182...Fast forward idler, 184...Rewind idler, 216
...Rubber idler, 224 ...Motor, 230 ...Belt, 232 ...1st
motor pulley, 234... second motor pulley, 262... cam drive motor, 266...
····belt.

Claims (1)

[Claims] 1 A first displacement member, a cam that reciprocates the first displacement member with a constant stroke, a plurality of second displacement members that switch the recording medium drive device to different operating states, and a rack that is connected to each other through a pinion mechanism. and the first displacement member and the second displacement member.
a plurality of differential members arranged in correspondence with the second displacement member and interlocked with the second displacement member while maintaining a differential relationship; a plurality of locking members movable between a locking position and a non-locking position;
an electromagnetic device that selectively displaces the plurality of locking members and holds the locking members at the locking position by electromagnetic force;
a medium drive member for driving a recording medium, a motor that can be rotated in the forward direction, and a pair of motors for transmitting the output of the motor when the motor rotates in the normal direction to the medium drive member and the output when the motor rotates in the reverse direction to the cam. a one-way clutch, which drives the recording medium when the motor is in a forward rotation state and drives the recording medium when the motor is in a reverse rotation state;
By electromagnetically selecting and regulating the displacement of the differential member, the corresponding second displacement member is selectively driven and displaced by the output of the motor when it is reversed. recording medium drive device.