JPS6049982B2 - Operation control device for recording medium drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control device for controlling the drive of a recording medium such as a magnetic tape. Moreover, the first objective is to provide a compact device, and the second objective is to improve the operational feeling in this type of system.

The operation control device for a recording medium drive device is roughly classified into a manual type, a plunger type, a motor drive type, etc. depending on the type of drive source for control.

Conventionally, in these systems, the operation of bringing the device mechanism into a predetermined operating state is performed by the driving force of this drive source, and the action of canceling this predetermined operating state is performed by the force of a spring charged with the driving force. The impact and impact noise generated when the mechanism of the device is actuated by this spring force poses problems in terms of the reliability of the device and the tactile sensation given to the user of the device. In addition, in such a method using spring force, the above-mentioned release operation cannot be performed stably unless this force is set sufficiently large, so the drive source must be a drive that can sufficiently charge this spring. It required a lot of power and had problems in terms of energy efficiency. Furthermore, the above-mentioned manual method requires a large amount of manual force, which poses a problem in terms of operability, and the plunger method requires a large amount of electric energy, and the volume occupied by the plunger itself becomes large. This poses a problem in terms of energy saving and miniaturization of the device, and in the motor drive system, the driving force of this motor is used to bring the above-mentioned device mechanism into the operating state, or in 5, release the operating state. The problem is that the driving force transmission mechanism that performs the operation for recording becomes complicated, which impedes the miniaturization of the device, and furthermore imposes restrictions on the mechanism for driving the recording medium, reducing its driving performance. Another problem is that it hinders the reduction in price and size of the device. The present invention provides an operation control device that eliminates the drawbacks of the conventional devices described above, 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 10 is the device board.

One end of the magnetic tape 12 is wound around a supply reel 14, contacts a tape guide 16, an erasing head 18, a tape guide 20, and a recording/reproducing head 22, which are fixed to the substrate 10, respectively, and is wound through a tape drive capstan 24. It is wound on a reel 26. The pinch roller 28 is rotatably supported by a shaft 32 mounted on one end of a pinch roller lever 30. A shaft 34 mounted 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 One end 3 of 30
A torsion spring 38 is applied between the protrusion 36a and the protrusion 30a, and is normally biased such that the protrusion 36a abuts the one end 30a. A tension spring 42 is stretched between the pin 40 set on the substrate 10 and the crimp lever 36, and urges the crimp lever 36 in a counterclockwise direction.
The pinch roller 28 is located at a position away from the.

Steps at 180 degrees opposite positions! The switch cam 44 provided with portions 44a and 44b is integrally fixed to a cam shaft 46, and the switch lever 28 that comes into contact with the outer periphery of the switch cam 44 is rotatably supported by a shaft 50 mounted on the base plate 10. Part 4
8a is in contact with the actuator 52a of the normally open type microswitch 523, and receives a counterclockwise biasing force therefrom.

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.
Ru. 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. Rewinding rack 6 Record rack 66 and differential opening 7 ports 68, 70, 72 and 74 are supported by mechanisms (not shown) relative to base plate 10 so as to be movable in directions shown by arrows 76 and 78, respectively. The cam follower 58 is formed with a square hole including flat parts 58a and 58b that come into contact with the triangular cam 56.
8c, 58d, 58e and 58f are formed, and a projection 58g is further formed. Differential rod 68, 70,
Shafts 80, 82, 84 installed in 72 and 74, respectively
Pinions 88, 90, 92 and 974 are rotatably supported by and 86, and these pinions are meshed and engaged with the rack portions 58c, 58d, 58e and 58f of the cam follower 58, respectively. play rack 60,
Rack portions 60a, 62a,
64a and 66a are formed, and these rack portions are meshingly 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 fast forward rack 6
Pin protrusions 62b and 64b that protrude toward the back side of the figure are formed at the tips of the rewinding rack 64 and the rewinding rack 64, respectively. Displacement levers 96, 98, 100 and 10' made of soft iron
:! are the shafts 104, 106, 1 installed on the substrate 10, respectively.
08 and 110, and has stepped portions 96a, 98a, 100a, and 102a at one end. At the other ends of the displacement levers 96 and 102, there are tension springs 112 and 11, each of which has one end fixed to the substrate 10 side.
A tension spring 114 is stretched between the other ends of the displacement levers 98 and 100, so that the displacement levers 96 and 1d0 move counterclockwise, and the displacement levers 98 and 102
is rotated clockwise. Stoppers 118, 120, 122, and 124 fixed to the substrate 10 prevent the displacement levers 96, 98, 100, and 102 from rotating, and are arranged so that the other ends of the displacement levers 96, 98, 100, and 102 come into contact with each other. It's getting old. displacement lever 96,
Magnetic cores 126, 128, 130 and 132 made of soft iron are integrally fixed to the substrate 10 by means not shown in the drawings, facing each of the magnetic cores 98, 100 and 102, respectively. Electromagnetic coils 134, 136, 138 and 140 are attached to the magnetic core. One of the two lead wires of each of these electromagnetic coils
One of each is wired in common and connected to terminal 142, and one of each of the remaining wires is connected to terminal 144, 146, 148 and 15.
0 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 leaf switch 152 is
8a contacts the maximum radius portion 56a of the triangular cam 56 such that its contact closes at the position shown in the figure. A gear 154 coaxial with the camshaft 46 is integrally fixed to the triangular cam 56. Stoppers 156, 158, 160 and 162 fixed to the substrate 10 are arranged at positions where one ends of the above-mentioned differential rods 68, 70, 72 and 74 can come into contact with each other, while the stoppers 118, 12
0, 122 and 124 have the above-mentioned racks 60, 62,
The one ends of 64 and 66 are arranged so that they can come into contact with 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 is opposed to the flat portion 58a of the lower roller 58, the displacement levers 96, 98,
Magnetic cores 126 and 128 in which 100 and 102 face each other
, 130 and 132 to rotate and displace the respective step portions 96a, 98a, 100a.
and 102a are stepped portions 68a and 70a of the differential rod, respectively.
, 72a and 74a.
8, 70, 72, and 74 and the racks 60, 62, 64, and 66 are determined to be regulated.
The above-mentioned magnetic attraction force is generated by the electromagnetic coils 134, 1.
This is done by energizing 36, 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 integrally have reel engagers 164a and 166a, respectively.
The reel shafts are rotatably supported by reel shafts 168 and 170, respectively. Fast forward arm 172 and rewind arm 1
74 is rotatably supported using a common axis as a shaft 176 installed on the sub-board 54, and shafts 178 and 180 are installed 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 192 decorated 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 planted on the sub-board 54, and the fast-forwarding lever 186 is urged 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 planted 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 arm 172, and a tension spring 202 is also stretched between the pin projection 188a and the rewind arm 174.
4 is hung. The pin protrusion 62b of the fast-forwarding rack 62 and the pin protrusion 64b of the rewinding rack 64 in the state shown in FIG. 2 are shown in broken lines in FIG. The cam surface 186b abuts against the pin protrusion 62b, stopping the fast-forwarding rack 62 at a position where it is in pressure contact with the stopper 120, and similarly, the rewind lever 188 receives the biasing force of the spring 200 and the cam surface 188b abuts against the pin protrusion 62b. comes into contact with the pin protrusion 64b,
The rewinding rack 64 is stopped at a position where it is in pressure contact with the stopper 122.

In this state, the fast-feeding arm 172 comes into contact with the pin protrusion 186a under the biasing force of the spring 202, and is stopped by the small diameter stepped portion 182a of the fast-feeding idler 182 at a position away from the take-up reel stand 166. Similarly, the rewinding arm 174 receives the biasing force of the spring 204, and the pin protrusion 188a
The small diameter stage 184a of the unwinding idler 184 is stopped at a position away from the supply reel stand 164. Next, the winding lever 206 is moved to the shaft 20 mounted on the sub-board 54.
8, and a substrate 10 (not shown) at one end.
A pin 212 is installed so as to pass through an elongated hole 210 formed in the pin 212 and come into contact with one end 30a of the pinch roller lever 30. Furthermore, the other end of this winding lever 206 has a shaft 2.
14 is installed, and a rubber idler 216 and a take-up pulley 2 are relatively rotatable about this shaft 214 as a common shaft.
18 are rotatably supported. The rubber idler 216 and the take-up pulley 2 are assembled by a well-known method (not shown).
The relative rotation of 18 is configured to occur through a predetermined friction torque. Take-up lever 206 and sub-board 54
A tension spring 222 is stretched between the pin 220 and the pin 220, and the take-up lever 206 is moved counterclockwise to a position where the pin 212 comes into contact with one end 30a of the pinch roller lever 30, which is indicated by a two-dot chain line. It is rotated in the direction. The tape drive motor 224 is fixed to the back surface of the sub-board 54, and the motor pulley 22 is attached to an output shaft 224a protruding from the surface of the sub-board 54.
6 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 centrally fixed integrally. belt 2
30 from the motor pulley 226 to the take-up pulley 218;
It is stretched so as to return to the motor pulley 1J226 via a fast forward idler 182, a rewind idler 184, and a flywheel 228. Next, the triangular cam drive mechanism will be explained.
The pulley 250 is concentrically integrated with a small gear 252, and is rotatably supported by a shaft 254 mounted on a sub-board 54. The large gear 256 and the small gear 258 are concentrically integrated, and the small gear 258 and the gear 154 explained in FIG.
The large gear 256 meshes with the small gear 25 mentioned above.
2, the sub-board 54: d. Axis 26 planted in
0 and is rotatably supported. Cam drive motor 262
is fixed to the back surface of the sub-board 54, and a motor pulley 264 is fixed to an output shaft 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 relationship between the rotation of the tape drive motor 224 and the cam drive motor 262 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 counterclockwise, and the fast forward idler 182 and take-up pulley 218 are rotated 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, and rotates counterclockwise.
The gear 254 is driven by driving the belt 266 in the direction of the arrow 270.
Rotate counterclockwise. 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 apparatus in a magnetic tape reproducing state.

When the regeneration state is selected, the operation control circuit (not shown) described above energizes terminals 142 and 144 and cam drive motor 262 of FIG. 3. Therefore, the displacement lever 9
6 is attracted to the magnetic core 126, rotates clockwise relative to the shaft 104, and its stepped portion 96a connects to the stepped portion 68a of the differential rod 68.
At the same time, the triangular cam 56 and the switch cam 44 begin to rotate counterclockwise. However, at this point, the stoppers 118 and 1 explained in FIG.
56 positions are set. 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 68a, so the pinion 88 rotates around the shaft 80 and the rack portion 58c of the cam follower is rotated. Play rack 60 displacement in direction of arrow 300
is converted into a displacement of the rack portion 60a, and the play rack 60 is driven in the direction of the arrow 302. 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 brings the actuator 52a of the microswitch 52 into the state shown by the two-dot chain line. It's ready, and turn 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. As the triangular cam 56 further rotates and the tip of the switch lever 48 falls into the stepped portion 44b of the switch cam 44, the actuator 52a of the microswitch 52 returns to the position shown by the solid line in the figure, returning the switch to the OFF state. let The above-mentioned operation control circuit controls the 0FF of the leaf switch 152.
When the microswitch 52 shifts from 0N to 0FF 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 crimp lever 36 is rotated clockwise by the pin 60b against the spring 42, and the protrusion 36a engages the one end 30a of the pinch roller lever 30.
As a result, the pinch roller lever 30 is rotated clockwise by the elasticity of the spring 38, and the pinch roller 28 is pressed against the capstan 24 with the tape 12 interposed therebetween. 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 the winding lever 206 rotates counterclockwise around the shaft 208 due to the action of the spring 222. The rubber idler 216 is brought into rolling contact with the take-up reel stand 166. Therefore, the magnetic tape 12 is connected to the tape drive motor 22.
The film is driven at a constant speed in the direction of arrow 303 by the capstan 24 and the pinch roller 28, which are rotated from 4, and is wound onto a take-up reel with a constant torque based on the friction torque between the take-up pulley 218 and the comb idler 216. As the magnetic tape 12 runs, the recording/reproducing head 22 (shown in FIG. 1) reproduces the signal from the magnetic tape, and the reproduction 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 166 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 Figure 2 and is not moved at all. This operation is similar to the rewinding rack 64 in FIG. 2, 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 arrow 300 in FIG. 4, so it is not displaced in the same way. As is clear from this explanation, the electromagnetic coils 134, 136, 138 in FIG.
, 140 will not be 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 playback state, the above-mentioned operation control circuit energizes the cam drive 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 arrow 302, performing the reverse operation of shifting to the regeneration state described above, 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 2. 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 0 degrees counterclockwise and reaches the position shown in FIG. 1, the microswitch 52 changes from 0N to 0FF, and the leaf switch 152 changes from 0FF to ON prior to this. The operation control circuit is O of the leaf switch 152.
In the N state, the microswitch 52 changes from 0N to 0FF.
When the cam drive motor 262 is displaced, it is determined that the stopping operation is completed, and at the same time, the electromagnetic coil 13 is turned off.
Cut off the power to 4. 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. 5 shows a plan view of the apparatus 1 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 becomes engageable with the stepped portion 70a of the differential rod 70, and at the same time, the triangular cam 56 and the switch cam 44 begin to rotate counterclockwise, and the movement of the cam follower 58 in the direction of the arrow 78 causes a differential Similarly, the movable rod 70
However, since it is stopped by the displacement lever 98 as described above, the pinion 90 moves the fast-forwarding 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 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 small diameter stepped portion 182a of the rapid feed idler 182
is in contact with the take-up reel stand 166, and then the fast-forwarding lever 186 is still rotated clockwise so that its pin protrusion 186
a separates from the fast-forward arm 172 and moves to the fast-forward idler 18.
2 is pressed against the take-up reel stand 166 by the elastic force of the spring 202. Therefore, the take-up reel stand 166 is rotated counterclockwise by the fast-forward idler 182 that is rotated by the tape drive motor 224 to drive the take-up reel 26 and play the magnetic tape 12 in the direction of the arrow 402 faster than when playing. run at speed. In addition, in the above-mentioned fast-forwarding state, the microswitch 52 returns to 0FF due to the rotation of the triangular cam 56,
The operation control circuit determines that the operation for fast forward operation is completed when the microswitch 52 is displaced from 0N to 0FF while the leaf switch 152 is in the 0FF state, and cuts off the power to the cam drive motor 262, so that the above-mentioned regeneration is performed. As in the operating state, the triangular cam 56 is rotated 180 degrees from the position shown in FIG.
It stops at the position where it moved in the 0 direction.

Even when this fast-forwarding operation is performed, the racks other than the fast-forwarding rack 62 are not displaced on the same operating principle as described in the explanation of the reproduction operation above. This fast-forwarding motion is used to stop the fast-forwarding state described above. This is the opposite of the operation that performed the playback, and can be understood from the above explanation of the stop operation in 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 in this case, the differential rack 72 is locked, and the cam follower 58 The rewinding rack 64 is moved by this movement. This causes the pin protrusion 64b to move to the rewind lever 188.
is driven counterclockwise, and the small diameter stepped portion 184a of the rewinding idler rack 184 is brought into rolling 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 the rewind state to the 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/reproduction changeover switch (not shown) is connected to 6, and an energizing force in the direction of 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 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 selection of the playback state, fast-forwarding state, rewinding state, recording state, and stop state can be easily performed by operating a switch that energizes an electromagnetic coil or the like.

As described above, the present invention includes a first displacement member (cam follower in the embodiment) that follows a motor-driven cam, a plurality of second displacement members (such as a play rack) that switches the device to different operating states, a plurality of differential members (differential rods) that are differentially displaced via the first and second displacement members and the rack and pinion mechanism; a plurality of locking members (displacement levers) that are freely displaceable between a locking position and a non-locking position, and selectively displacing the plurality of locking members to move the locking member to the locking position. It is equipped with an electromagnetic device (such as an electromagnetic coil) that is held by electromagnetic force, and by electromagnetically selecting and regulating the displacement of this differential member, the corresponding second displacement member is selectively displaced. According to the present invention, the operating state of the recording medium drive device can be selected while the first displacement member and the second displacement member are always mechanically connected via the differential mechanism. Therefore, there is no need to mechanically couple or separate these two displacement members, and therefore, the effect that the operation is quiet and highly reliable can be achieved.

Furthermore, this operating state can be selected by simply regulating the movement of the differential member so that it does not displace, so the energy required for this is extremely small, and therefore a small and energy-saving electromagnetic coil can be used to select this operating state. This makes it possible to select the desired type of equipment, and has the great effect of making this type of device more electronic, more compact, and more energy efficient.

[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 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, and FIG. 6 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...Zench roller, 44...Switch cam, 52...Micro switch, 54...Sub-board, 56...Triangle Cam, 58...Cam follower, 60...
...Play rack, 62゛゜゜゜゛Fast forward rack, 64
... Rewinding rack, 66 ... Rucord rack, 68, 70, 72, 74 ... Differential rod, 88
,90,92,94...Zenion,96,98,
100, 102... Displacement lever, 134, 13
6,138,140... 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...Tape drive motor, 230...Belt, 262...
・Cam drive motor, 266...belt.

Claims (1)

[Claims] 1 a cam driven by a motor, a first displacement member that follows the cam, a plurality of second displacement members that switch the recording medium drive device to different operating states, and a rack and pinion mechanism that displaces the first displacement member. a plurality of differential members that maintain a differential relationship with the displacement member and the second displacement member and are disposed corresponding to the second displacement member; and a plurality of differential members disposed corresponding to the second displacement member; a plurality of locking members that are displaceable between a position where the differential member is locked and a position where the differential member is not locked; and a plurality of locking members that are selectively displaced to bring the locking member into the locking position. an electromagnetic device held by electromagnetic force, and configured to selectively displace the corresponding second displacement member by electromagnetically selecting and regulating the displacement of the differential member. An operation control device for a recording medium drive device.