JPS6113295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device,
The aim is to provide a device that has drive means with an extremely simple configuration while allowing full remote control of PLAY, FF, and REW.

For example, tape drive means in video tape recorders and the like have conventionally had a very complicated structure. Because PLAY, FF, and REW basically require different modes such as tape speed and transmission torque, a dedicated idler or gear is provided for each, and a lever that moves each idler or gear to a predetermined position by external operation. This is because the classes are structured in various ways. In addition, remote control has been promoted in recent years, and for this purpose, means such as providing dedicated motors for each of the take-up and supply reels, loading cylinders, etc., or using solenoids to move each idler are used. , which not only becomes expensive but also increases the size of the device and increases power consumption.

Therefore, although the present invention is a remote controller, it does not use a solenoid, and furthermore, the motor can be configured with a single drive motor.

The present invention will be described below based on drawings showing an example of implementation. 1 to 3 show a tape cassette used in the present invention and a method for driving the tape cassette. In particular, this embodiment employs a method in which a portion of the cassette reel is exposed from the cassette body and driven directly, in contrast to the conventional reel stand drive method. In the figure 1
is the cassette body, 2 is the upper cover, and the upper cover 2
A supply reel 5 supports a reel shaft 3 on a part thereof, and has a magnetic tape 4 wound around the reel shaft 3.
A take-up reel 6 is rotatably supported.
The lower ends of the supply and take-up reels 5 and 6 are integrally provided with idler contact portions 5a and 6a that are partially exposed through the opening 1a of the cassette body 1. 7 is an idler, and 8 is a lid that covers the tape stretching portion 4a of the magnetic tape 4.

Next, the configuration of the driving means of the present invention will be explained. First, FIG. 4 shows the configuration of the relay drive body 9. In Fig. 4, the drive motor (not shown) and belt 1
The first rotating body 16 connected at
A slip spring 18 supported by the lower end of the rotary support shaft 12 is brought into contact with the lower end and urged upward. Reference numeral 14 denotes a second rotating body whose lower part than its upper end is fitted into the first rotating body 16, which is rotatably supported on the rotating support shaft 12 by a bearing 13, and whose lower outer surface is connected to the first rotating body 16. The one-way rotating clutch 15 interposed between the inner surface of the first rotating body 16 comes into contact with the felt 17, and the upper end constitutes an idler part 14a with which an external driven body comes into contact. ing. A third rotating body 19 shown in FIG. 5 is driven by coming into contact with the second rotating body 14 of the relay drive body 9. As shown in FIG. The third rotating body 19 includes a sub-idler 20 whose outer periphery is lined with rubber, and a slip spring 21 from the sub-idler 20.
The main idler 22 to which driving force is transmitted via
It is composed of. Like the sub-idler 20, the main idler 22 also has a rubber lining on its outer periphery. 23 is a retaining ring that engages with the lower end of the main idler 22 and supports the lower surface of the slip spring 21. This third rotating body 19 is rotatably supported by an idler lever 24 via a bearing 25 . The idler lever 24 has a pin 28 attached to one end of a support lever 27 which is rotatably supported by a pin 25 implanted in a base plate 48 as shown in FIG.
It is pivoted by. In addition, idler lever 2
4 is engaged with a pin 30 at one end of the slide lever 29. One end of the link lever 32 that engages with the pin 31 provided on the support lever 27 is attached to the base plate 4.
The elongated hole 29a of the slide lever 29 engages with the pin 36 of the auxiliary link lever 34, which is rotatably supported by the link pin 33 fixed at 8. . Fifth
FIG. 6 shows the assembled state of each of the parts shown in the figure.
The pin 37 provided on the support lever 27 has the other end of an idler biasing spring 40, one end of which abuts against a protrusion 39a of a lock plate 39 whose rotation center is a lock plate pin 38 implanted in a base plate 48. It is in contact. The lock plate 39 is formed with a return spring 41 that biases the lock plate 39 clockwise, an unload spring 43 that biases the unload detection lever 42 counterclockwise, and a slide plate 44. Idler release lever 45 rotated by cam groove 44a
A protrusion 39b that can be brought into contact with one end is provided. As shown in FIGS. 7 and 8, the slide plate 44 is pushed by a protrusion 46a provided at a part of the lower end of the loading member 46, and the board 48 is pushed against the slide plate return spring 47 shown in FIG. Long hole part 48
It moves in the direction of arrow A via guide pins 49 and 49 that engage with points a and 48b. A cam groove 44a as shown in the figure is formed at the tip of the slide plate 44, and one end of an idler release lever 45, which is pivotally supported by a release lever pin 50 implanted in the base plate 48, is provided in this cam groove 44a. The cam pin 51 shown in FIG. A contact 45 a that can come into contact with one end of the idler lever 24 is formed in a part of the idler release lever 45 .

Next, the configuration of the cassette locking and unlocking means will be explained. In FIG. 8, 52 is a tape guide drum, and a loading motor (not shown)
The magnetic tape 4 is pulled out from inside the tape cassette and wound by rotation of the loading ring 46 which meshes with the loading gear 53 directly connected to the tape cassette, as in the conventional case. This loading ring 46
At its upper end, there is a gear section 46b that meshes with the loading gear 53, and at its lower end, there is a guide section 46c that abuts an unload roller 54 rotatably supported by one end of the unload detection lever 42. The unload roller 54 has an engagement recess 46d. 9 to 12 show the construction of the cassette locking means and its lock release means. The cassette holder 55, which guides the insertion of the cassette body 1 into the main body of the apparatus, is provided with rotating shafts 56 on the tape guide drum 52 side, sandwiching the tape guiding drum 52, and the cassette holder 55 guides the insertion of the cassette body 1 into the apparatus main body. A holder up spring 57 biasing counterclockwise, and a lock pin 60 that engages with a holder lock pawl 59 having a pivot point on a side plate 58 fixed to the side surface of the base plate 48 are provided on the side surface. The holder lock pawl 59 is biased clockwise by a lock spring 61 hooked on the side plate 58 and comes into contact with a part of the side plate 58, but there is a contact portion 59a against which one end of the unload detection lever 42 can come into contact. It has a lock spring 61 and can be rotated counterclockwise by an unload spring 43 via an unload detection lever 42. Rotation shaft 5 of cassette holder 55
6, an eject button 63 and an eject lever 6 protruding from the device are provided on the holder board 62 having
4 so as to be integrally rotatable, and a return spring 6 that rotates the eject button 63 clockwise.
5. A square hole 62a that regulates the rotation angle of the eject button 63, and a switch 66 that sends an eject signal when the eject button 63 is manually operated against the return spring 65. The eject lever 64, which rotates integrally with the eject button 63, has a locking part 64a that is inserted into the square hole 62a of the holder board 62 and whose rotation is restricted, and one end that contacts the unload detection lever 42. An eject spring 68 has both ends elastically connected to an eject bar 67 that slides while being guided by elongated holes 48c and 48d of the board 48, and an eject spring 68 that contacts the other end of the eject bar 67 to prevent rotation of the eject button 63. The contact portion 64b is provided with a locking contact portion 64b. As shown in FIG. 11, the lower end of the cassette holder 55 is provided with a lock plate holding mechanism that engages with the hole 39a of the lock plate 39 to prevent rotation of the lock plate 39. Reference numeral 69 denotes a lock shaft that engages with the hole 39c of the lock plate 39, and is slidable up and down on the lock shaft holder 70 fixed to the cassette holder 55, and is connected to the retaining ring 71 provided at the lower end and the lock shaft holder 70. It is biased downward by a biasing spring 72 interposed therebetween.

The operation of the magnetic recording/reproducing apparatus having the above configuration will be described below. First, in Figure 13,
The state of the main drive unit from before the loading of the cassette main body until the loading of the magnetic tape 4 is completed is shown. The lock plate 39 is stopped by the stopper 73 by the return spring 41.
At this time, the lower notch 39d of the protrusion 39b of the lock plate 39 [see FIG. 6]
The end surface of the support lever 27 is in contact with the pin 37, and the idler biasing spring 40 is in contact with the pin 37. One end of the support lever 27 is biased while being held between the lower notch 39d and the idler biasing spring 40. There is. In this state, the sub-idler 20 that is in contact with the rotating body 14 in FIG.
9 positions the idler lever 24 at the center of the cassette. The idler release lever 45 is guided by the cam groove 44a of the slide plate 44, which is in the position shown in the figure by the slide plate return spring 47, and the abutting portion 45a is located at a position spaced apart from the idler lever 24, and the protrusion of the lock plate 39. It is further away than the portion 39b. The unloading spring 43 connecting the locking plate 39 and the unloading detection lever 42 is set so that it has a free spring length when in this positional relationship, so there is no biasing force against the unloading detection lever 42. Therefore, the unloading roller 54 is rotated most clockwise by the locking spring 61 of the holder locking pawl 59, and is at a position where it does not come into contact with the guide portion 46c of the loading ring 46. The holder lock claw is the lock pin 6 of the cassette holder 55.
0 is engaged to hold the cassette main body 1 in a state where it can be loaded. The magnetic tape 4 is wound around the tape guide drum 52 by the rotation of the loading motor, and when a predetermined path has been formed, each tape post (not shown) is brought into contact with a positioning member (not shown), and then the loading ring 46 When the tape post rotates, it applies a biasing force to the positioning member of the tape post, positioning it more reliably and firmly, and the protrusion 46 of the loading ring 46
After moving the slide plate 44 from the state shown in FIG. 13 to the state shown in FIG. make it stop.
That is, when the cassette main body 1 is installed in the device, the cassette holder 55 is locked, and the magnetic tape 4 forms a tape path with a plurality of tape posts that follow the loading ring 46, and then the tape posts are positioned and the slide plate 44 is moved. Movement begins, and the loading motor stops in the state shown in FIG. 14 (STOP mode state), completing the loading mode. In the STOP mode state shown in FIG. 14, the idler release lever 45 is rotated clockwise by the cam groove 44a of the slide plate 44, and first
When the protrusion 39b of the cassette holder 55 is pressed and the lock plate 39 is rotated counterclockwise against the return spring 41, the lock shaft 69 of the cassette holder 55 and the lock plate 39 are
The holes 39c are at the same position, and the lock shaft 69 is lowered by the biasing spring 72 and engages with the holes 39c to prevent the lock plate 39 from rotating. This rotation of the lock plate 39 causes the support lever 27 to be released by pressing the lower notch 39d of the lock plate 39, and the idler biasing spring 40 generates a clockwise biasing force. The contact portion 45a contacts the idler lever 24 and prevents the support lever 27 from rotating. As described above, the idler biasing spring 40 applies pressure contact force between the sub-idler 20 and the second rotating body 14 by the lock plate of the lock plate 39, but the idler release lever 45
A state in which contact between the second rotary body 14 and the second rotating body 14 is prevented is the STOP state. Further, the unload spring 43 connecting the lock plate 39 and the unload detection lever 42 generates a biasing force by the rotation of the lock plate 39, and presses the unload roller 54 against the guide portion 46c of the loading ring 46.

Next, FIG. 15 showing the PLAY mode will be explained. In PLAY, the loading motor further rotates in the loading direction, pushes the slide plate 44, and stops with the idler release lever 45 rotated counterclockwise. Since the contact portion 45a of the idler release lever 45 separates from the idler lever 24, the support lever 27 is rotated clockwise by the idler biasing spring 40, and the sub-idler 20 is brought into pressure contact with the second rotating body 14.
At this time, the rotation of the support lever 27 causes the auxiliary link lever 34 to rotate counterclockwise around the link pin 33 via the link lever 32, and the pin 34 is further rotated from the end of the long hole 29a of the slide lever 29 to
is released, so that the sub-idler 20 supported by the idler lever 24 can roll around the outer periphery of the second rotating body 14. The drive motor is
During PLAY, the first rotating body 16 rotates clockwise, and the first rotating body 16 connected by the belt 10 also rotates clockwise, so this driving force is transferred to the one-way rotating clutch 15.
The cutting direction is transmitted to the second rotating body 14 via the felt 17 by a slip spring 18 at the lower end. In other words, the slip structure is such that an appropriate winding torque can be applied to the magnetic tape 4 from the capstan and pinch roller to the take-up reel 6 during play. In this way, clockwise rotational torque is also applied to the second rotating body 14, so that counterclockwise rotational torque is transmitted to the sub-idler 20. Rotational torque is also transmitted to the main idler 22 via the slip spring 21, but since there is a bearing load on the bearing 25 between the main idler 22 and the idler lever 24, the sub-idler 20 is Rotate clockwise along the At this time, if the bearing load is small in response to the load due to the rotation of the idler lever 24, the idler lever 24 cannot rotate, but this can be done by replacing the bearing 25 with an Oiles metal or the like with a large bearing load. The main idler 22 rotated clockwise comes into contact with the idler contact portion 6a of the take-up reel 6 of the cassette body 1, transmits clockwise rotational torque to the take-up reel 6, and rotates the magnetic tape 4 with an appropriate torque. It becomes possible to wind it up. The torque transmitted from the drive motor is transmitted to the belt 10, the first rotating body 16, the felt 17,
second rotating body 14, sub-idler 20, slip spring 21, main idler 22, take-up reel 6,
The information is transmitted to the magnetic tape 4.

Next, the REW mode will be explained based on FIG. 16. The slide plate 44 is stopped at a position before STOP. The idler release lever 45
It is in the same position as during PLAY, and the sub-idler 20 is also brought into pressure contact with the second rotating body 14. Since the drive motor is designed to rotate counterclockwise in the opposite direction to that during PLAY, the first rotating body 16 and the second rotating body 14 are rotated counterclockwise as one unit by the action of the one-way rotating clutch 15. Rotate in the direction. The sub-idler 20 and the main idler 22 also rotate clockwise, contrary to the PLAY mode, and the idler lever 24 rotates counterclockwise, causing the main idler 22 to come into contact with the idler contact portion 5a of the supply reel 5, and the supply reel 5 to transmit counterclockwise rotational torque. According to this route, the slip mechanism between the first rotating body 16 and the second rotating body 14 corresponding to the winding torque during PLAY does not work on the one-way rotating clutch 15, and the transmitted torque is
It becomes much larger than when playing. Slip spring 2 between main idler 22 and sub-idler 20
1 has a transmission torque larger than that of the slip spring 18, and is used as a tape overtension prevention slip to prevent abnormal tension when the main idler 22 comes into contact with the reel at the end of the tape, and is used during normal winding. In this case, the main idler 22 and sub idler 20 do not operate during PLAY or REW, and rotate as one unit.

Next, the movement from REW and PLAY to STOP will be explained with reference to FIG. The STOP position is the same as the loading completion position, and the idler release lever 45
rotates clockwise, the contact portion 45a pushes up the idler lever 24, and prohibits contact between the sub-idler 20 and the second rotating body 14. At this time, the support lever 27 rotates counterclockwise due to the movement of the idler lever 24, the auxiliary link lever 34 further rotates clockwise, and the pin 36 moves to the slide lever 2.
9 and pulls up the slide lever 29. Therefore, idler lever 2
4 rotates around the pin 28, and the main idler 2
2 is positioned approximately at the center of the opening 1a of the cassette body 1. To return this main idler 22 to the center in STOP mode, it is necessary to
When changing to the mode, the sub-idler 22 can be easily moved from the take-up reel 6 to the supply reel 5 side, and as will be described later, this idler center return mechanism is also activated at the end of unloading when loading the next cassette. This is to prevent the main idler 22 from becoming an obstacle.

Next, the unloading and cassette ejecting operations will be explained. The unloading signal is obtained by rotating an eject button 63 projecting outside the apparatus shown in FIG. 10 in a counterclockwise direction and operating a switch 66 using an eject lever 64 to obtain a pulse signal. The unloading motor is driven by this signal, and the loading ring 4
6 rotates counterclockwise, and the slide plate 44 first returns to the state shown in FIG. 16 by the return spring 47, that is, the REW state, and comes into contact with a stopper (not shown) and stops. At this position, the main idler 22 contacts the idler abutting portion 5a of the supply reel 5, and winds up the magnetic tape 4 loaded on the supply reel 5. Furthermore, when the loading ring 46 rotates counterclockwise and the tape post following the loading ring 46 moves into the cassette body 1, and the magnetic tape 4 is stored in the cassette body 1, the loading ring 46 rotates counterclockwise. The ring 46 is in the state shown in FIG. Since the unload detection lever 42 is biased counterclockwise by the lock plate 39, the unload roller 54 engages with the recess 46d of the loading ring 46, and as shown in FIG. Rotate clockwise. Then, as shown in FIG. 19, the lock pin 60 is released from the holder lock pawl 59, and the cassette holder 55 together with the cassette main body 1 is rotated counterclockwise about the pivot shaft 56 by the holder up spring 57.
The cassette main body 1 can be taken out. At this time, the lock plate 39, which has been disengaged from the lock shaft 69 due to the rotation of the cassette holder 55, is rotated by the return spring 41 to the state shown in FIG. With this rotation of the lock plate 39, the support lever 27 has one end having the pin 37 held by the idler biasing spring 40 and the protrusion 39b, and rotates counterclockwise, thereby moving the sub-idler 20 and the second rotating body 14.
spaced apart. Further, the auxiliary link lever 34 rotates via the link lever 32 whose one end is supported by the support lever 27, and returns the main idler 22 to the center as in the STOP mode described above.

The series of operations is completed above, but in addition to this, the operation when it is desired to insert the cassette holder 55 into the main unit and then pop it out of the apparatus again in the power-off state will be explained. When the cassette holder 55 is loaded into the main unit and held by the holder lock claw 59, the lock shaft 69 and the hole 39c of the lock plate 39 are not engaged, so the unload detection lever 42
There is no urging force to rotate the holder lock pawl 59. When the eject button 63 shown in FIG. 18 is rotated counterclockwise from this state, the eject bar 67 is pulled via the eject spring 68, its tip presses the unload detection lever 42, and the holder lock claw 59 is pulled. Rotate to unlock the cassette holder 55. After loading is started, the unload roller 54 of the unload detection lever 42 comes into contact with the guide portion 46c of the loading ring 46, and the unload detection lever 4
To lock the rotation of 2, press the eject button 63.
Even if the eject bar 67 is operated, the eject spring 68 is only extended and the eject bar 67 is not moved. However, by operating the ejector lever 64, the switch 66
operates, but the signal from this switch 66 is
Since the circuit is configured to detect only in STOP mode, it will not shift to unloading mode during other PLAY, REW, or loading operations.

Next, FF will be explained. In this configuration, the rotation direction of FF is the same as that of PLAY, so the transmission from the first rotating body 16 to the second rotating body 14 is via the slip mechanism, and the transmitted torque becomes small. Therefore, FF is made to follow exactly the same path as PLAY, but while the drive motor is controlled at a considerably lower rotation speed than the no-load rotation speed of the drive motor during PLAY, in FF the rotation is controlled by increasing the voltage applied to the drive motor. Since it does not perform winding, it is possible to wind up at a speed several times faster than PLAY. In other words, in FF, like in PLAY, the tape is driven by pressing the pinch roller against the capstan, but by increasing the voltage applied to the motor, canceling rotation control, and rotating at high speed together with the capstan, high-speed winding is possible. During the above-mentioned REW, the voltage applied to the motor is increased and the rotation control is canceled, similar to the FF. The above is expressed by the motor torque curve in FIG. S on the Y axis indicates the motor rotation speed,
T on the X axis indicates motor torque. D is the control rotation speed during PLAY, and the torque at the intersection of the curves B is the driving load. During normal rotation, the applied voltage is controlled in response to load fluctuations to obtain constant speed rotation, but in order to improve control accuracy, the torque curve is considerably lower than the maximum applied voltage applied to the drive motor. It is common practice to set the motor and its driving load so that it can be controlled by Therefore
During FF and REW, if an applied voltage corresponding to A is applied, the driving load is about the same as during PLAY, so it is possible to obtain the rotational speed C, and high-speed winding is performed.

The magnetic recording/reproducing apparatus of the present invention can be implemented as described above, and the REW, FF, and PLAY modes can all be performed by rotating or reversing the loading motor and drive motor using external electrical signals. In particular, although the present invention has been described as a configuration that does not use a reel stand, a configuration that uses a reel stand can be adopted without any change. During PLAY, the rotation is transmitted from the drive motor to the slip mechanism with extremely low slip torque, and then to the reel driver (main idler), and during rewinding, the relay drive is rotated as one unit by the clutch, and the rotation is transferred to the supply reel. has a configuration that transmits large torque, so
For PLAY, FF, and REW, the optimal drive conditions can be obtained simply by changing the rotation direction of the drive motor. Also, as can be seen from the drawings, the number of idlers is much smaller than in conventional tape recorders and is very compact, which is advantageous in promoting miniaturization of the device.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention.
2 is a plan view of the cassette, FIG. 3 is a cutaway perspective view of the main parts showing the reel drive system, FIG. 4 is a cutaway perspective view of the main parts of the relay drive body, and The figure is an exploded perspective view of the main drive unit, Figure 6 is a perspective view of the main drive unit, Figure 7 is a side view of the loading ring, Figure 8 is a plan view in PLAY mode, and Figure 9 is the cassette eject. Fig. 10 is a side view of the eject mechanism operating section when the cassette holder is locked, Fig. 11 is a side view of the eject mechanism locking section when the cassette holder is locked, and Fig. 12 is a side view of the eject mechanism operating section when the cassette holder is locked. Plan view, Fig. 13 is a plan view of the main drive section in loading mode, Fig. 14 is a plan view of the main drive section in STOP mode, Fig. 15 is a plan view of the main drive section in PLAY mode, Fig. Figure 16 is a plan view of the main drive unit in REW mode, Figure 17 is a plan view at the end of unloading, Figure 18 is a side view of the eject mechanism operation part when the cassette is ejected, and Figure 19 is the plan view when the cassette is ejected. FIG. 20 is a side view of the eject mechanism lock portion of FIG. 2, and is a graph showing the torque curve of the drive motor. DESCRIPTION OF SYMBOLS 1...Cassette main body, 4...Magnetic tape, 5...Supply reel, 6...Take-up reel, 9...Relay drive body, 10
... Belt, 14... Second rotating body, 14a... Idler part, 15... One-way rotating clutch, 16... First rotating body, 17... Felt, 18... Slip spring,
19...Third rotating body, 20...Sub idler, 21
...Slip spring, 22...Main idler, 24...
Idler lever, 27...Support lever, 29...Slide lever, 32...Link lever, 34...Auxiliary link lever, 36...Pin, 39...Lock plate, 39
a, 39b...protrusion, 39c...hole, 40...idler biasing spring, 41...return spring, 42...unload detection lever, 43...unload spring, 44...slide plate, 44d...cam groove, 45...idler release Lever, 45a... Contact portion, 46... Loading ring, 46a... Projection, 46b... Gear portion, 46c...
Guide part, 46d... Recessed part, 47... Slide plate return spring, 48... Substrate, 48a, 48b... Elongated hole part, 49
...Guide pin, 51...Cam pin, 52...Tape guide drum, 53...Loading gear, 54...Unload roller, 55...Cassette holder, 57...
Holder up spring, 59...Holder lock claw,
59a... Contact portion, 60... Lock pin, 61... Lock spring, 62... Holder board, 62a... Square hole, 6
3... Eject button, 64... Eject lever, 64a... Locking part, 64b... Contact part, 65... Return spring, 66... Switch, 67... Eject bar, 68... Eject spring, 69... Lock shaft, 7
3...stopper.

Claims (1)

[Claims] 1. A magnetic recording and reproducing device that runs a magnetic tape wound between the two reels by driving a take-up reel and a supply reel, a first rotating body connected to a drive source and capable of rotating in both forward and reverse directions; a reel driver that selectively contacts the supply reel or the take-up reel and transmits a tape winding force;
A second rotating body is provided between the rotating body and the reel driving body to relay driving force, and a one-way rotating clutch is provided in a transmission path between the first rotating body and the second rotating body. A mechanism and a slip mechanism are provided in series, and the first and second rotating bodies are integrated into a transmission path between the first and second rotating bodies by a one-way rotation clutch mechanism by selecting the rotational direction of the drive source. 1. A magnetic recording/reproducing device comprising: a first drive path that rotates the first rotating body; and a second drive path that limits the transmission torque between the first rotating body and the second rotating body by the slip mechanism.