JPH0363140B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a drive device for a channel change mechanism in a tape player, and particularly to a drive device for a channel change mechanism in a tape player. This relates to a drive device.

[Technical Background of the Invention] The pinch roller, which is crimped to the capstan shaft for constant-speed tape running on the power plate, must be released from the crimping to prevent deformation and deterioration when the power is interrupted. be.

Conventionally, this release has been carried out by interlocking a pinch roller with a head plate provided with a head, and retracting the head plate when the power is turned off. According to this method, the head plate must be moved forward again when the power is turned on, and a mechanism for moving the head plate back and forth when the power is turned off and turned on is required, making the structure complicated. In addition, the head plate has many modes that require forward and backward movement, such as fast forward/rewind, rotation, and eject, and moving it back and forth when power is turned off or turned on has the disadvantage of complicating the control system. It was hot.
On the other hand, tape players are provided with a channel change mechanism for switching the running of the tape from the forward side to the reverse side, or vice versa.

This channel change mechanism alternately presses and separates left and right pinch rollers from a capstan shaft using a roller change plate that is linked to a drive device that utilizes the rotational force of a motor, for example. The roller change plate has forward side and reverse side cams, and each cam is engaged with a left and right pinch roller.When the roller change plate is locked to either the left or right side, these cams will The pinch roller is pressed against the capstan shaft, and the other pinch roller is separated.

The applicant previously proposed a mechanism for separating the pinch roller from the capstan shaft without moving the head plate in order to solve the above-mentioned problems associated with such separation of the pinch roller. That is, by returning the roller change plate to the center position using a biasing force such as a spring when the power is turned off, the left and right cams do not press either pinch roller to the capstan shaft. . This mechanism eliminates the need to move the head plate when the power is turned on or off, simplifying the configuration and control system, and making it possible to further downsize the tape player.

[Problems with the Background Art] However, as described above, the applicant's previous proposal is a channel change in which a power plate is moved by the rotation of a power gear linked with a motor, and a roller change plate is moved by this power plate. When implemented in a mechanism, the following problems arise.

That is, in this type of channel change mechanism, as shown in FIG. 9, the power gear 1 is provided with two intermittent portions 1F and 1R on the forward side and reverse side. This word gear 1 meshes with a gear 2 on the motor side. A roller-shaped pressing portion 1b is provided on the surface of the power gear 1, and these are engaged with the long holes 40 of the power plate 3, so that the power plate 3 reciprocates as the power gear 1 rotates. The power plate 3 is connected to a roller change plate of a channel change mechanism via a member not shown.

During the play operation of this mechanism, one of the two intermittent parts 1F and 1R is opposed to the gear 2 on the motor side and locked away from the motor to prevent channel change. During channel change operation, remove this lock and use the power of gear 2 on the motor side to rotate power gear 1 by half a turn.
By locking again at the position of the intermittent portion on the opposite side, the power plate is reciprocated to perform a channel change.

However, in this mechanism, when the roller change plate is returned to the center position by the force of the spring when the power is turned off as described above, the power plate 3 interlocked with the roller change plate also attempts to return to the center position. Then, the power plate 3 is inserted into the elongated hole 40.
Since the power gear 1 is connected to the power gear 1 by the pressing portion 1b, the power gear 1 also tends to rotate along with the power plate 3. However, in order for the power gear 1 to rotate, after releasing the lock, it is necessary to forcefully rotate the stopped motor by meshing with the gear 2 on the motor side, which places a burden on the motor and related mechanisms. This burden, on the other hand, is the power plate 3
This creates resistance to the movement of the roller change plates and requires a strong spring to move these plates to the central position. Furthermore, during play, each plate must be moved against this strong spring, creating the problem that a large driving force is required.

In addition, the channel change mechanism is a mechanism that moves the roller change plate from the forward side to the reverse side or vice versa, but as mentioned above, when the power plate 3 comes to the center position when the power is cut off, it To restore it, power gear 1
It is necessary to move the power plate 3 to its original position. However, since the power gear 1 is locked every half rotation and the power plate 3 is locked in the forward or reverse direction, in the conventional device, when the power is turned on,
The power gear 1 rotates half a rotation by the driving force of the motor, and the roller change plate also moves and is locked in a position opposite to its original position. That is, a channel change is performed when the power is turned on.
Therefore, when the power is turned on, in order to run the tape in the same direction as before the power was turned off, an unnecessary channel change operation must be performed after the power is turned on.

[Object of the Invention] The present invention was proposed in order to solve the above-mentioned problems, and its purpose is to move each member and thereby separate the pinch roller without putting a burden on the motor. To provide a drive device for a channel change mechanism, which can smoothly perform the above operations, and can maintain tape running in the original direction without changing the channel when power is turned on.

[Summary of the Invention] The drive device for the channel change mechanism according to the present invention is configured to release the engagement between the power gear and the power plate when the power is turned off, so that the power plate 3 is released by the force of the spring when the power is turned off. Even if the power gear 1 is moved to the center position, the power gear 1 is prevented from rotating.

Further, in the present invention, the power gear 1 is engaged with a lock link 6 that locks it in the play position, and when the power plate 3 is in the left and right positions, the lock link 6 locks the power gear 1 and locks the power plate 3 in the play position. is provided with a pressing part that presses the lock link 6 when it is in the center position, and when the power is turned off, this pressing part releases the lock of the power gear 1, thereby meshing the gear 2 on the motor side and the power gear 1. It is.

Furthermore, the present invention is configured to delay the locking of the power plate 3 when the power is turned on.
When the power is turned on, the power gear 1 is locked in the same position as before the power was turned off.

[Embodiment of the Invention] An embodiment of the drive device for the channel change mechanism of the present invention as described above will be specifically described with reference to the drawings.

As shown in FIG. 1, a power gear 1 having two intermittent portions 1F and 1R on the forward side and the reverse side meshes with a gear 2 on the motor side. A roller-shaped pressing part 1 is provided on the surface of the power gear 1.
b is provided. A long hole 4 extending in a direction perpendicular to the direction of movement of the power plate 3 is formed in the power plate 3, and the pressing portion 1b is inserted into the long hole 4 so as to be movable along the long hole 4.

A pin 5 provided on the frame side of the tape player is fitted into a slide hole 3a provided on the power plate 3, so that the power plate 3 can move in the vertical direction in the figure. This power plate 3
is connected to the roller change plate of the channel change mechanism via a member not shown. Therefore, like the conventional channel change mechanism, the power plate 3 is always urged to the neutral position by a spring (not shown).

The elongated hole 4 of the power plate 3 is provided with edges 4F and 4R on the forward side and the reverse side, which are pressed by the pressing portion 1b when the power gear 1 rotates. Further, the elongated hole 4 is provided with a power plate that faces the edges 4F and 4R on the forward side and the reverse side, so that when the power plate 3 returns from the lock position to the center position, the power plate 3 is pressed against the stopped pressing part 1b. Relief portions 4f and 4r are provided to allow movement in the return direction of 1. Therefore, in this embodiment, the elongated hole 4 has a moving part 4c corresponding to the width of the elongated hole formed between the relief parts 4f and 4r on the forward side and the reverse side, and the inside of this moving part 4c is pressed. The portion 1b reciprocates.

On the other hand, a cam 1c is provided on the back side of the power gear 1, and a lock link 6 centered on a shaft 6a and a sub-lock link 7 centered on a shaft 7a are provided on both sides of the cam 1c. By engaging with the stepped portion, the power gear 1 is locked. Pin 6 for lock link 6
b is provided, and when the power plate 3 is not in the left or right lock position, this pin 6b is pressed by the pressing part 3b provided on the power plate 3, the lock link 6 rotates, and the power gear 1 is locked. It seems like it will be released. The sub-lock link is normally in a released state by a member not shown, and the power gear 1 is locked only by a channel change operation.

In addition, lock link 6 and sublock link 7
is urged toward the power gear by a spring (not shown). Furthermore, cam 1 of power gear 1
c is biased in the rotational direction by a plate spring 8.

The drive device for the channel change mechanism of the present invention having the above configuration operates as follows.

During forward running...Fig. 1 When the tape is running on the forward side,
As shown in FIG. 1, the intermittent portion 1F of the power gear 1 in the forward position faces the gear 2 on the motor side. Therefore, the power gear 1 is locked by the lock link 6 and is stopped in a state separated from the rotating motor-side gear 2.

On the other hand, the power plate 3 is locked on the forward side by an electromagnetic plunger (not shown) together with the roller change plate of the channel change mechanism, and therefore the pinch roller on the forward side is in a pressed state. The power gear 1 has its pressing portion 1b located at the forward side edge 4F of the elongated hole 4 of the power plate 3.
At the same time, the lock link 6 is locked to the cam 1c.
It is locked by engaging with the stepped portion of the lock.
Here, the lock link 6 can engage with the cam 1c because the power plate 3 is in the forward position and the pin 6b of the lock link does not engage with the pressing part 3b of the power plate. This is because it is biased towards the power gear.

The cam 1c is biased in the rotational direction by the plate spring 8, but the lock link 6
The rotation is prevented, and the sub-lock link 7 is in a released state.

When the current is cut off...Figures 2 and 3 When the power is suddenly cut off in the forward state shown in Figure 1, power is no longer supplied to the electromagnetic plunger that locks the roller change plate and power plate 3 in the forward direction. lost, leaving these plates free. Then, the roller change plate that had pressed the pinch roller returns to the center position by the force of the neutral spring, and the pinch roller is released, while the power plate 3 that is interlocked with the roller change plate also returns to the center position as shown in Figure 2. return. As a result, the pressing portion 3b of the power plate presses the lock link 6, causing the lock link 6 to rotate, thereby unlocking the power gear 1.

On the other hand, in the power gear 1, the movement of the power plate 3 causes the pressing portion 1b to move relatively within the elongated hole 4 from the forward edge 4F to the relief portion 4f, and the power gear 1 does not actually rotate. do not have.

However, since the power gear 1 is unlocked, it rotates slightly due to the urging force of the plate spring 8 that presses the cam 1c, and eventually the current is cut off as shown in Fig. 3. It stops at the position where it meshes with gear 2 on the motor side, which is stopped.

Therefore, when the power is turned off, the engagement between the power gear and the power plate is released, so the power plate 3, which moves the power gear 1 meshed with the stopped motor, does not forcefully rotate, and the motor The member can be moved smoothly without putting a burden on the member.

Channel change operation...FIGS. 4 and 5 By the way, if only the above configuration is used, the channel change will be performed as described above when the power is turned on again.

That is, when the power is turned on in the state shown in FIG. 3, the motor starts rotating, and the power gear 1 meshing with the gear 2 on the motor side starts rotating from the forward position to the reverse position. Therefore, the roller change plate and the power plate 3 start moving toward the reverse side when the pressing portion 1b of the rotating power gear 1 presses the edge 4F of the elongated hole 4. Then, after the power plate 3 reaches the reverse side as shown in Fig. 4 and is locked by an electromagnetic plunger (not shown) that is excited when the power is turned on, the power gear 1 further rotates as shown in Fig. 5. It will be locked in the reverse position and stop.

At this time, reverse side intermittent portion 1R of power gear 1
is opposed to gear 2 on the motor side, and the rotational force to power gear 1 is cut off. Note that the motor continues to rotate. Further, the pressing portion 1b of the power gear 1 has a long hole 4.
It passes from the forward side through the moving part 4c and is locked at the reverse side edge 4R.

Also, as a result of the power plate 3 being locked in the reverse side, the pressing portion 3b of the power plate that was pressing the pin 6b of the lock link 6 moves back.
The lock link 6 is powered by the spring bias.
It meshes with the gear cam 1c to lock the power gear 1.

In addition, a normal channel change is performed by turning off the electromagnetic plunger by detecting the end of the tape or by manually commanding a channel change without cutting off the power, leaving the channel change plate and power plate 3 free, and moving the lock link. , unlocks power gear 1.
Then, the power gear 1 is pressed by the plate spring 8 and rotates, meshing with the gear 2 on the motor side.
You will be able to obtain the driving force of the motor.

When power is turned on...Figs. 6 to 8 As described above, with only the configuration of the previous embodiment, a channel change is performed when power is turned on. Therefore, in the present invention, a delay circuit is provided in the electromagnetic plunger for power plate locking. The locking of the power plate is delayed by half a rotation of the power gear.

That is, when the power is turned on in the power off state shown in FIG. 3, the power gear 1 starts rotating from the forward position to the reverse position, while the electromagnetic plunger for power plate locking is provided with a delay circuit. Because of this, it will not be sucked in immediately.

That is, after the power is turned on and the gear 2 on the motor side and the power gear 1 start meshing as shown in FIG.
After reaching F, as shown in FIG. 6, the edge 4F is pressed to the reverse side to move the power plate 3 to the reverse side.

When the power gear 1 rotates further and the intermittent part 1R on the reverse side faces the gear 2 on the motor side,
The pressing part 1b moves to the reverse side edge 4R through the moving part 4c, but at this point the electromagnetic plunger is not yet attracted. Therefore, the roller chain change plate is also in an unlocked state, and the power plate 3 is also in an unlocked state. Therefore,
As shown in FIG. 7, the power plate 3 returns to the center position by the force of the neutral spring.

At this time, since the pressing part 3b of the power plate 3 in the neutral position is pressing the pin 6b, the lock link 6 cannot lock the power gear 1, and the power
Gear 1 can rotate freely. The power gear 1 meshes with the gear 2 on the motor side again by the plate spring 8, and is pressed by the pressing portion 1b of the power gear 1, so that the roller change plate and the power plate 3 are forwarded as shown in FIG. Start moving to the side.

Thereafter, the power gear 1 further rotates and moves to the forward position as shown in Fig. 1, and when power is turned on to the electromagnetic plunger in this state, the power plate 3 that has moved to the forward side is locked at that position. Ru. At that time, the pressing part 1b passes from the reverse side of the elongated hole 4 through the moving part 4c to the edge 4F on the forward side.
is locked. Also, as a result of the power plate 3 being locked to the forward side, the pressing portion 3b of the power plate that was pressing the pin 6b of the lock link 6 moves back, and the lock link 6 is forced to move toward the power gear due to the biasing force of the spring. It meshes with the stepped portion of the cam 1c and locks the power gear 1.

As described above, in the present invention, since the locking of the power plate is delayed, the power
Since the gear rotates to its original position and locks, there is no channel change when the power is turned on.

In addition, the means for delaying the locking of the power plate is
The locking means is not limited to this, but may be mechanically delayed, and the locking means itself is not limited to an electromagnetic plunger.

[Effects of the Invention] As described above, according to the drive device for the channel change mechanism of the present invention, the engagement between the power gear and the power plate is released when the power supply is turned off, so that the power supply is stopped. When the motor is disconnected, the movement of each member and the release of the pinch roller can be smoothly performed without putting a burden on the motor. In addition, the power plate and the lock link are engaged, and the lock link unlocks the power gear when the power plate is in the center position, and also delays the start of the power plate's operation when the power is turned on. When the power is turned on, the power is turned on again.
It is possible to rotate the gear and run the tape in the same direction as before the power was turned off, thereby providing a tape player with high operability.

[Brief explanation of drawings]

1 to 8 are plan views showing an embodiment of the driving device for the channel change mechanism according to the present invention, in which FIG. 1 shows when forward running, FIG. 2 shows when power is cut off from the forward position, and FIG. Figure 3 shows when the operation is completed, Figures 4 and 5 show the operation in the middle of the channel change operation and the subsequent locking to the reverse position, and Figures 6 to 8 show the stages in the middle of the operation when the power is turned on. This is what is shown.
FIG. 9 is a plan view showing an example of the prior art. 1...Power gear, 1F, 1R...Intermittent part, 1
b...Roller, 1c...Cam, 2...Motor side gear, 3...Power plate, 3a...Slide hole, 3b...Press portion, 4...Long hole, 4F, 4R...
...edge, 4f, 4r... relief part, 4c... moving part,
5...pin, 6...lock link, 6a...shaft,
6b...Pin, 7...Subblock link, 7a...
...Axis, 8...Plate spring.

Claims (1)

[Claims] 1. In conjunction with a roller change plate that alternately presses and releases the pinch rollers on the capstan shaft,
A power plate 3 that moves to the forward side and the reverse side and to the center position thereof; An electromagnetic plunger that locks the power plate 3 to the forward side and the reverse side during play operation of the tape player; and a power plate 3 that is always kept at the center position. The power plate is provided with a long hole 4 extending in a direction perpendicular to the direction of movement of the power plate, and the long hole 4
A pressing portion 1b provided on the surface of the power gear inside
is movably inserted along the long hole 4, and the green part of the long hole is pressed by the pressing part 1b which rotates as the power gear rotates, and the power plate moves to the forward side and the reverse side. In the elongated hole, the power plate is placed opposite the edges 4F and 4R pressed by the pressing part, and when the power plate returns from the locked position to the central position, the power plate is pressed against the stopped pressing part. The power gear has two intermittent parts on the forward side and reverse side that do not mesh with the gear on the motor side, and the power gear 1 has two intermittent parts on the forward side and the reverse side that do not mesh with the gear on the motor side. A locking link 6 is provided with a spring 8 biased in the direction of engagement with the gear, and locks the power gear 1 at a position where the intermittent portion thereof faces the gear 2 on the motor side.
The power plate 3 is provided with a pressing part 6b that presses the lock link 6 in the release direction when the power plate 3 is at the center position, and delays the locking of the power plate 3 by half a rotation of the power gear 1 when the power is turned on. A drive device for a channel change mechanism characterized by: