JPH0416248Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an actuating device for a movable head, and in order to miniaturize VTRs (video tape recorders), the control head is retracted during tape loading, and This invention relates to an actuating device for a movable head which is returned to a predetermined operating position upon completion of the operation.

[Prior Art] Conventionally, this type of movable head has been provided with a cam mechanism to move the control head forward and backward, and in which the control head is biased toward the operating position and the loading block is controlled during tape loading. There is a known device that uses the urging force of the head to push it away and evacuate it.

[Problems to be solved by the invention] The above-mentioned conventional example has a complicated structure and high cost, and in the latter case, the loading head receives the urging force applied to the control head when it is pushed away, so the loading mechanism requires an extra load. Both methods had issues, such as the need for additional materials.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an actuating device for a movable head which has a simple structure and does not require any unnecessary addition to the loading mechanism, solving the problems of the prior art.

[Means for Solving the Problems] The present invention includes a tape loading member that moves between a tape unloading position and a tape loading position by rotation of a motor, and a tape loading member that is rotatably supported on a base. The tape loading member includes a head plate that comes into contact with the loading member during loading of the tape loading member, a pressing portion provided on an operating member that is linked to the motor, and a pin that presses the head plate to a forward position. This operating device for a movable head is characterized in that it is equipped with a transmission lever that does not transmit the operation of the pressing portion to the head plate from the loading position until it comes into contact with the head plate.

[Operation of the invention] The movable head actuating device of the invention moves the loading block toward the tape loading position while guiding the loading block to the guide groove using a transmission means such as a link using the torque generated by the rotation of the motor. let Then, one end of the head plate located in the moving area of the loading block is pushed. As a result, when in the loading position, the head plate, which was biased by the spring, is released from bias by the reverse rotation of the motor that drives the link, and freely rotates clockwise as described below. This will allow the vehicle to pass through the loading block without being obstructed.

Next, when the loading block passes the area of the head plate, a pin attached to the worm gear comes into contact with a lever pivotally supported on the support shaft of the worm gear, thereby rotating the lever clockwise. This lever then rotates another lever equipped with a pin that comes into contact with the head plate clockwise through the biasing force of the spring, and the pin pushes the head plate counterclockwise to close the loading block. position on the moving area. Note that while the worm gear is rotating, the first lever continues to rotate, causing the spring to accumulate biasing force. After the worm gear stops rotating, the biasing force of this spring continues to hold the head on the head plate in the loading position.

On the other hand, when the loading block is moved in the unloading direction by the reverse rotation of the motor, the first
The pin of the worm gear that was in contact with the lever moves away from this lever, the biasing force of the spring is removed, and even if the loading block comes into contact with the head plate, the head plate will rotate clockwise without any resistance. move and evacuate from the loading block movement area.

[Example] The present invention will be explained based on illustrated embodiments.

1 and 2 are a plan view and a side view showing the right half of a tape loading member to which an embodiment of the present invention is applied. 1 is a main plate, 2 is a motor fixed to the bottom of the main plate 1, 3 is a belt that transmits the rotation of the motor 2 to the pulley 4, 5
6 is a worm that rotates together with the pulley 4; 6 is a worm gear that is rotatably attached to a support shaft 7 provided on the main plate and meshes with the worm 5; 8;
9 and 10 are links that move the loading block 11 to the loading position as the worm gear 6 rotates; 12 is a connection point 13 between the links 9 and 10;
Main plate 1 is a guide groove that guides the
is formed.

Furthermore, 14 is a sub-plate in which a guide groove (not shown) is formed for guiding the loading block 11, 15 is a head plate rotatably supported on a support shaft 16 provided on the sub-plate 14, 1
Reference numeral 7 denotes a control head supported by a head plate 15, and the head plate 15 enters into the movement area of the loading block 11 when the control head is at the tape unloading position.

Furthermore, 18 is a stopper that stops the loading block 11 at the end of its movement during tape loading.

Next, the operating members interlocked with the motor 2 will be explained. A lever 1 19 is rotatably attached to the support shaft 7 and engages with a pin 20 provided on the worm gear 6.
9 and the pin 25 of the lever 21.

The above tape loading member is connected to the worm gear 6 when the motor 2 rotates during tape loading.
When the loading block 11 is rotated clockwise, the loading block 11 moves while being guided by a guide groove (not shown) formed in the sub-plate 14, and the head plate 15, which is intruding into this movement area, is rotated clockwise by the support shaft 16. The motor 2 passes through the motor while rotating around the center, and comes into contact with the stopper 18 and stops.
will also stop.

In this loading process, the pin 20 of the worm gear 6 does not come into contact with the lever 19 while the pin 20 of the worm gear 6 rotates approximately 180 degrees from the start of rotation, so that the lever 21, which is connected via the spring 23, is free to move counterclockwise. It is rotatable. Therefore, when the loading block 11 comes into contact with the head plate 15, the head plate 15 rotates clockwise about the support shaft 16 and retreats from the movement area of the loading block 11. At this time, since the pin 20 of the worm gear 6 is not in contact with the lever 19, the head plate 15 can be retracted from the movement area of the loading block 11 without any resistance.

That is, when the loading block 11 rotates the head plate 15, the head plate 1
Since no force is acting on the head plate 5 to suppress its rotation, the head plate 15 rotates smoothly and no unnecessary load is applied to the loading member.

On the other hand, when the motor 2 rotates and the loading block 11 moves through the link 10 and passes the area of the head plate 15, the pin 20 moves to the lever 19.
The levers 19 and 21 rotate clockwise. Then, the pin 22 presses the head plate 15, the head plate 15 rotates counterclockwise, the tape contacts the control head 17, the loading block 11 contacts the stopper 18, and tape loading is completed. .

On the other hand, during tape unloading, the operation is the opposite of tape loading. That is, when the motor rotates in the reverse direction and the loading block 11 starts to move away from the stopper 18, the pin 20 of the worm gear 6 that was in contact with the lever 19 moves away from the lever 19, and the loading block 11 starts to contact the head plate 15. Even if they touch each other, the head plate 15
The tape is unloaded by rotating clockwise without any resistance and retreating from the movement area of the loading block 11.

Furthermore, when the loading block 11 passes the head plate 15, the pin 20 pushes the spring 19 clockwise as the worm gear 6 rotates, and the lever 21 is rotated clockwise by the biasing force of the spring 23. and head plate 15 with pin 22.
is pressed and rotated counterclockwise around the support shaft 16.

Furthermore, when the control head 17 reaches the loading position and the head plate 15 is stopped by a stopper (not shown), the lever 2
1 also stops, but the lever 19 continues to rotate clockwise against the urging force of the spring 23 until the loading block 11 comes into contact with the stopper 18 and stops, and when the worm gear stops, the lever 19 continues to rotate clockwise. Stop at a position.

As a result, the control head 17 is reliably held at the tape loading position by the biasing force of the spring 23 when tape loading is completed. Furthermore, during unloading, the motor 2 may be rotated in the opposite direction as described above.

[Effects of the invention] According to the invention, when the head plate is pushed by the loading block and retracted as described above,
The pin holding the head plate on the locus of movement of the loading block so as to bias the spring has means for removing the bias by rotation of the worm gear; The loading position is maintained by the urging force of
Costs can be reduced by adopting a simple structure in which the bias is removed by reverse rotation of the motor during unloading.

Further, the movable head actuating device of the present invention has excellent effects such as high durability because no extra burden is placed on the loading member.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an embodiment of the present invention together with a tape loading mechanism, and FIG. 2 is a side view thereof. 1... Main plate, 2... Motor, 3...
Belt, 4...Pulley, 5...Worm, 6...
Worm gear, 7, 16... Support shaft, 8, 9, 10
...Link, 11...Loading block, 1
2...Guide groove, 13...Connection point, 14...Sub plate, 15...Head plate, 17...Control head, 18...Stopper, 19,2
1... Lever, 20, 22, 25... Pin, 23
...Spring, 24...Protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] A tape loading member that moves between a tape unloading position and a tape loading position by the rotation of a motor, and a tape loading member that is rotatably supported on a base and that is mounted during loading of the tape loading member. a head plate that comes into contact with the loading member; a pressing portion provided on the operating member that is interlocked with the motor; and a pin that presses the head plate to the forward position; An operating device for a movable head, comprising a lever that does not transmit the operation of the pressing portion to the head plate until the lever comes into contact with the head plate.