JPH0350347B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device that is capable of reciprocating recording and playback, and uses the force of a motor that drives a reel stand to release the lock during operation, especially when the reel stand is stopped. The purpose is also to enable unlocking.

The present invention provides two flywheels for normal rotation and reverse rotation, one flywheel transmits the power to rotate the reel stand, this flywheel is provided with a friction mechanism, and the other flywheel is provided with a friction mechanism. It is characterized by a configuration in which the rotational force that releases the lock in the running state is obtained from the flywheel, and when the reel stand is stopped, one flywheel operates a friction mechanism and slips, and the rotational force of the other flywheel causes the reel to slip. It is possible to provide a magnetic recording/reproducing device with a very simple configuration that can perform lock release.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing in particular the rotating system of the mechanical parts of the magnetic recording and reproducing apparatus of this embodiment, FIG. 2 is a side view, and FIGS. 3 and 4 are cross sections for explaining the operation of the take-up reel stand. It is a diagram.

FIG. 1 shows the normal rotation playback state. In the rotation system below the cassette 1 and the recording/playback head 2, the normal rotation flywheel 3 and the reversal flywheel 4 are connected to a motor 6 by a single belt 5. The wheels rotate in opposite directions, creating an anti-rolling effect. As shown in the side view of FIG. 2, this belt 5 is three-dimensionally stretched over a pulley of a motor 6 and two flywheels 3 and 4 in order to be stored compactly.

The axis of the forward rotation flywheel 3 is a forward rotation capstan 7, and a forward rotation pinch roller 8 is selectively pressed against the forward rotation capstan to cause the tape to run in the forward rotation side.

As shown in Fig. 3, this forward rotation capstan 7
A flywheel gear 9, which is formed coaxially with the motor and rotates in unison, is always engaged with the first reduction gear 10. A shaft 13 of the reduction gear 10 is mounted on an idler plate 12, and the idler plate 12 is rotatably supported by a shaft 11 mounted on a mechanical chassis. The relationship between these axes 11 and 13 is the first
As is clear from the figure, the idler plate 12 is located approximately on the same line as the positive shaft capstan 7, and the idler plate 12 is located on the same line as the shaft 1.
Even if it rotates a little around 3, the flywheel gear 9
and the first reduction gear 10 are designed not to separate from each other. This first reduction gear 10 includes a forward rotation winding gear 1 which slips at a constant torque as described later.
4 are coaxial, and this gear 14 is engaged with a reel stand gear 15a. This engagement occurs when the idler plate 12 is in the position shown in FIGS. 1 and 3 during normal rotation. At this time, as shown in the figure, when the forward rotation flywheel 3 rotates counterclockwise to feed the tape, the information is sequentially transmitted to the flywheel gear 9, the first reduction gear, the forward rotation take-up gear 14, and the reel stand gear 15a. The reel stand gear 15a rotates counterclockwise, and the reel stand 15c rotates together with the reel stand gear 15a.
Wind up the tape.

Here, as shown in FIG. 3, the slip mechanism of the first reduction gear 10 and the forward rotation take-up gear 14 is constructed by sandwiching a felt 16 between them and pressing them together from the forward rotation take-up gear 14 side with a leaf spring 17, thereby applying frictional force. It is designed to obtain constant torque. Further, the reduction ratio in this rotation system is set to be approximately 1.1 to 2 times the rotation speed of the reel stand 15c, which is 0.3 to 0.7 revolutions/second, in order to wind the tape at a constant speed.

Next, the mode of fast forwarding (fast forwarding in the forward rotation direction) will be explained. In the fast-forwarding state, it is necessary to release the pressing force of the tape against the forward rotation capstan 7 by the pinch roller 8 (the tape and the head 2 may be in contact or non-contact), and drive the reel stand 15c at high speed with strong torque. . The present invention has a unique rotation system in which the reel stand 15c is moved up and down. In the regeneration mode shown in FIGS. 1 and 3, the first reduction gear 10 and the reel stand gear 15b are vertically separated, but when viewed from the top, they are in a position where they can be engaged, and the forward rotation winding gear 14 and It is engaged with the reel stand gear 15a.

When the reel stand 15c is manually moved downward, the first reduction gear 10 and the reel stand gear 15b are engaged with each other, and the take-up gear 1
4 and the reel stand gear 15a are separated. As a result, the flywheel gear a is directly connected to the reel stand 15c via the first reduction gear 10, and the reel stand 15c is directly connected to the reel stand 15c.
can be rotated with strong torque and at high speed.

The mechanism for moving the reel stand 15c is such that the shaft 15d can slide up and down using a shaft 19 mounted on the reel base board 18 as a guide, and is not always attached upwardly by a spring 20. The reel stand 15c, reel stand gear 15b, and reel stand gear 15a are press-fitted into this shaft 15d, which is being driven, and rotate together. When the reel stand 15c is pushed downward by manual operation, the locking member 21 is inserted into the recess at the lower end of the shaft 15d, so that the reel stand 15c is locked in the hollow position, and as described above, the reel stand 15c is locked in the hollow position. Gear 15b is engaged and enters the fast forwarding state.

Next, the states of reverse playback and reverse fast forward (rewind in normal play) will be explained.

FIG. 5 is a plan view similar to FIG. 1, showing an inverted reproduction state. Here, the idler plate 12 is rotated clockwise around the shaft 11 of the mechanical chassis by an idler moving mechanism to be described later, and the first reduction gear 10 rotating around the shaft 13 is moved. As described above, a small amount of movement will not separate the gear 10 from the flywheel gear a, but it will separate from the normal rotation reel stand gears 15a and 15b. Then, it comes to engage with the second reduction gear 22 on the opposite side from the normal rotation reel stand. Of course, this engagement does not occur during normal rotation as described above.

This second reduction gear 22 rotates around a shaft 24 mounted on the mechanical chassis. Further, the reversing take-up gear 23 is coaxial with the second reduction gear 22, is configured to slip with a constant torque, and is engaged with the reel stand gear 25a. At this time, as in the case of forward rotation, if the forward rotation flywheel 3 is rotating counterclockwise, the flywheel gear 9, the first reduction gear 22, the reversal take-up gear 23, and the reel stand gear 25a
The rotational force is sequentially transmitted to the reel stand gear 25a, which rotates clockwise, and the reel stand gear 25c, which rotates together with the reel stand gear 25a, can wind up the tape. Of course, at this time, the forward rotation pinch roller 8 separates from the forward rotation capstan 7, and the reverse rotation pinch roller 2
6 is pressed against the reversing capstan 27, and the tape runs in the reversing direction. Therefore, playback (or recording) in the reverse direction is possible.

Here, as shown in FIG. 6, the slip mechanism of the second reduction gear 22 and the reversing take-up gear 23 is made by sandwiching a felt 28 between them and pressing them together from the reversing take-up gear 23 side with a spring 29. transmitting torque. This is independent from the slip mechanism for forward rotation described above, and the winding torque can be set independently for forward rotation and reverse rotation.

Next, the fast rewind (fast forward in the reverse direction) mode will be explained. In fast return, in order to rotate the reel stand 25c with strong torque and high speed like fast forward, the reel stand 25c is rotated in the same way as the reel stand 15c.
It constitutes a unique rotation system that moves up and down.

In the reverse playback mode shown in FIGS. 5 and 6, the second
Although the reduction gear 22 and the reel stand gear 25b are separated in the vertical direction, they are in a position where they can be engaged when seen in a plan view, and the reversing take-up gear 23 and the reel stand gear 25
a is engaged. Reel stand 25 by manual operation
When c is moved downward, the idler plate 12 is rotated clockwise by the idler movement mechanism as in the case of reverse playback, and the engagement between the forward rotation reel stand gears 15a and 15b and the first reduction gear 10 is interrupted. From the planar positional relationship shown in Fig. 5, as shown in Fig. 7,
The reversing take-up gear 23 and the reel stand gear 25a are separated, and the second reduction gear 22 and the reel stand gear 25b are engaged. Therefore, the force from the flywheel gear 9 is transmitted to the reel stand 25c, causing it to rotate at high speed with strong torque.

The structure of the reel stand is the same as that for forward rotation, and the locking member 21 enters the recess at the lower end of the reel shaft to lock the reel stand in the lowered position.
The reel stand gear 25b is engaged and the fast rewinding state is maintained. As described above, by locking the vertical movement of each axis during fast forwarding and fast forwarding back, the mode can be maintained.

Next, the idler moving mechanism will be explained. 8th
The figure shows a plan view of this part.

A shaft 32 is installed on the idler plate 12 which rotates around the shaft 11 of the mechanical chassis, and this shaft 32 is guided by the cam surface of the drive cam 31 and rotates between a forward rotation state 32 and a reverse rotation state 32'. Rotate between.
Relay gear 30 always engaged with first reduction gear 10
rotates around a shaft 33 mounted on a mechanical chassis, and a gear 30a coaxially and integrally provided with this relay gear 30 is in a state capable of engaging with a drive cam 31. The relationship between the relay gear 30 and the drive cam 31 is shown in FIGS. 9a, b, and c when viewed from above, and in FIG.
It is shown in Figures a and b and will be explained below.

FIG. 9a shows a normal rotation state, in which the toothless portion 31a of the drive cam 31 faces the relay gear 30a, and the drive cam 31 does not move. This time, the 10th one seen from the back
As shown in Figure a, the drive cam 31 is locked by a locking member 35 controlled by a solenoid 34. Here, the 10th
When the solenoid 34 is attracted as shown in FIG. b, the locking member 35 gives an initial rotation to the drive cam, and the relay gear 30a and the drive cam 31 are thereby engaged. Therefore, as shown in FIG. 9b, rotational force is applied to the drive cam 31 from the forward rotation flywheel 3, the first reduction gear 10, and the relay gears 30, 30a, causing the shaft 32 to move along the cam surface.
moves, that is, the idler plate 12 rotates around the shaft 11 to a position 12' shown in dashed lines in FIG. 8, and then moves to the inverted state shown in FIG. 9c. In the reversed state, the other toothless portion 31b of the drive cam 31 (the toothless portion 31
a) faces the relay gear 30a, the rotation of the drive cam 31 stops, and the 10th
They are locked by the locking member 35 in the same positional relationship as shown in Figure a.

Next, when the solenoid 34 is operated to enter the normal rotation regeneration mode or the forward rotation mode, the solenoid 34 is attracted, the drive cam 31 rotates half a turn in the same manner as described above, and the idler plate 12 returns to the position shown by the solid line in FIG.

As described above, according to this embodiment, the idler plate 12
By rotating the reel, normal rotation playback and reverse playback are switched, and by moving the driven reel stand downward in each state, fast forwarding in the rotational direction is possible.

In other words, during forward rotation regeneration, the forward rotation pinch roller 8
The solenoid 34 is controlled to advance the head and move the idler plate 12 to the normal rotation side. During reversal playback, the solenoid 34 is controlled so as to move the reversing pinch roller 26 and the head forward at the same time, and move the idler plate 12 to the reversing side 12'. During fast forwarding of normal rotation, the solenoid 34 is controlled so as to push the reel stand 15c downward to release the pinch roller that is in contact with it at that time and move the idler plate 12 to the normal rotation side. Similarly, for fast winding in normal rotation (fast forwarding in reverse direction), by pushing the reel stand 25c downward, the solenoid 34 releases the pinch roller that is in contact with it at that time and moves the idler plate 12 to the reverse side 12'. This made it possible to construct a mechanism capable of reciprocating motion very easily, contributing greatly to miniaturization and weight reduction.

Note that the above-mentioned slip mechanism is not limited to between the first reduction gear 10 and the normal rotation take-up gear 14, and between the second reduction gear 22 and the reverse rotation take-up gear 23, for example, Platform gear 15a
and 15b, or between the reel stand gears 25a and 25b. Furthermore, it goes without saying that the "playback" state mentioned above is the same as the "recording" mode when the recording operation is performed at the same time.

Next, the winding torque for fast forwarding and fast unwinding will be explained. Returning to FIG. 3, a felt 44 is sandwiched between the forward rotation flywheel 3 and the flywheel gear 9, and is pressed by a spring 45 to obtain a constant friction torque. With this friction mechanism, even if the reel stands 15, 25 are stopped at the end of fast feed and the flywheel gear 9 is stopped, they will slip between them and the forward rotation flywheel.

Further, the movement of the head 2 will be explained. 1st
Figure 1 shows the head board 3 at the bottom of the mechanical chassis.
9 and a plan view around the reel base board 18. FIG.
The head 2 is fixed to the head board 39, while the head 2
Elongated holes 39a and 39b are provided at the locations, and the mechanical chassis can be moved in parallel along the guide pins 40 and 41 fitted into the holes, and the return spring 38
It is urged in the direction of return by. By the way, the regeneration cam 37 is provided at a position where it can engage with the flywheel gear 36 that rotates together with the reversing side flywheel 4, and when the regeneration cam 37 is in a stopped state, the toothless portion 37a of the regeneration cam 37 and this flywheel gear 36
are opposed to each other, and the reproduction cam 37 is stopped. This regeneration cam 37 is controlled manually or by a solenoid or the like, and is locked at the regeneration position and the stop position. When the regeneration operation is performed, it engages with the flywheel gear 37, and due to its rotational force, the cam surface 37
At step b, the shaft 39c of the head board is moved upward in the figure, that is, the head 2 is advanced to the reproduction position.

At this time, the other end 39d of the head board lifts up one end 21a of the lock plate 21 that locks the lower end of the shaft of the reel stand, thereby releasing the lock for fast forwarding or fast rewinding. Here, to explain the lock plate 21, the reel board 18 is located between the two reel stands.
It is rotatably supported by a shaft 43 that is erected on the shaft, and is biased by a spring 42 attached near one end 21a. When the shaft of the reel stand mentioned above is pressed, the lock plate 21 is pushed sideways by the slopes of the conical lower ends 15d and 25d, rotates a little against the spring 42, and when the shaft is further lowered, it moves into the recessed part. The force of the spring 42 is used to prevent the shaft from moving upward.

Therefore, when a playback operation is performed during fast forwarding or fast rewinding, the head board 39 advances and moves the lock plate 21 to release the fast forwarding and fast rewinding locks.

In addition, as mentioned above, the torque for fast-forwarding and fast-rewinding is extracted from the forward-rotating flywheel 3, and since the forward-rotating flywheel 3 is provided with a friction, the reel stand is fixed at the end after fast-forwarding. Even when the winding is locked, the rotation of the reversing flywheel 4, that is, the release of fast forwarding and fast winding (release of the lock plate 21) via the regeneration cam 37 and the head board 39, is performed using the force of the motor. It is possible.

In the above configuration, the head board 39 is movable back and forth, and when it moves forward, the head contacts the tape for playback (or recording), and when it moves back, it performs fast forwarding or rewinding. Although the lock plate 21 is moved at the end when moving forward, the present invention applies the rotational force of the reversing flywheel 4 to the lock plate 21 by the reproducing cam 37 or the like, regardless of whether the head board 39 is movable or not. Any configuration that transmits the information may be sufficient. For example, the head 2 is fixed at all times, and has a member that presses the tape inside the cassette tape and presses it in during fast forwarding, rewinding, or stopping to make the tape and the head non-contact. Even if the tape and head are in contact with each other by retracting the member,
The present invention can be realized by interlocking the regeneration cam 37 with the above member and interlocking with the lock plate 21.

As described above, according to the present invention, two flywheels are provided for forward rotation and reverse rotation, one flywheel rotates the reel stand, and this flywheel is provided with a friction mechanism, and the other By using the rotational force of the flywheel to release the locking member that locks the running state, even if the reel stand stops at the end of the tape during fast forwarding, the friction mechanism will cause the former flywheel to slip and prevent the other from slipping. A simple operation and configuration in which the locking member can be released by the rotational force of the flywheel can be realized, and this can greatly contribute to the reduction in size and weight.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention during forward rotation, FIG. 2 is a side view thereof, and FIG. 3 is a cross-sectional view for explaining the operation of the take-up reel stand during forward rotation. The figure is a cross-sectional view to explain the operation of the take-up reel stand during fast forwarding, and Figure 5 is a plan view showing the time of reversal.
FIG. 6 is a sectional view for explaining the operation of the supply reel stand, FIG. 7 is a sectional view for explaining the operation during early winding, and FIG. 8 is a plan view of the idler moving mechanism.
Figures 9a, b, and c are plan views showing the cam mechanism;
10a and 10b are rear views of the cam mechanism, and FIG. 11 is a plan view showing the head drive mechanism. 1...Cassette, 3...Flywheel for forward rotation,
4...Reversing flywheel, 5...Belt, 6...
...Motor, 7...Capstan for forward rotation, 9...Flywheel gear, 10...First reduction gear, 12...
...Idler plate, 14...Forward rotation winding gear, 15
a, 15b...Forward rotation reel stand gear, 15c...
Forward rotation reel stand, 21...Lock plate, 22...Second reduction gear, 23...Reverse rotation winding gear, 26a,
25b... Reversing reel stand gear, 25c... Reversing reel stand, 30, 30a... Relay gear, 31...
Drive cam, 31a, 31b... Missing tooth portion, 34...
Solenoid, 36... Flywheel gear, 37...
...Regeneration cam, 37a... Missing tooth portion, 39... Head board, 44... Felt, 45... Spring.

Claims (1)

[Claims] 1. A reel stand for winding the tape, first and second capstans with different rotational directions provided for running the tape in both reciprocating directions, and the first and second capstans.
A first flywheel gear is coaxial with the first flywheel and rotates via a friction mechanism that obtains a constant torque, and rotational force is generated from the flywheel gear. a rotation transmission mechanism that decelerates and transmits rotation to the reel stand; a lock member that fixes the running state;
A second flywheel that rotates coaxially and integrally with the second flywheel.
a flywheel gear, and a mechanism for unlocking the locking member using the rotational force of the second flywheel gear, when the reel stand stops and the rotational force of the first flywheel gear is stopped. A magnetic recording and reproducing apparatus characterized in that the locking member is moved by the rotational force of the second flywheel via the second flywheel gear to release the lock.