JPS5851352B2 - Recording disk scanning body drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving device for a scanning body in an apparatus for recording or reproducing signals by bringing the scanning body into contact with a disk-shaped recording medium that is rotationally driven. The structure is such that operations of moving the scanning body toward and away from the recording medium, steady feeding operations in the radial direction of the recording medium, and rapid feeding operations can be performed easily.

EMBODIMENT OF THE INVENTION The present invention will be described below by giving an example thereof with reference to the drawings.

FIG. 1 shows a state other than recording and reproducing, where 5 is a recording disk mounted and fixed on a turntable 4, 6 is a drive motor for the turntable 4, and a worm 7a is attached to the tip of the shaft 1. , and the worm wheel 8 is engaged with this.

A shaft 9 has the worm wheel 8 fixed to one end and the worm 10 fixed to the other end, and the worm wheel 11 is engaged with the worm 10.

Due to these things, the feed screw 12 is connected to the turntable 40.
It can transmit rotational force that is synchronized with rotation.

15 is a fast feed gear A (a gear for rapidly moving the carriage 34 to the right).

), 16 is a fast feed gear B (a gear for rapidly moving the carriage 34 to the left).

), and this is the small gear 15a fixed to these.
Alternatively, the pinion 14a meshes with the fixed intermediate gear 14 through the pinion 16a.

Further, this intermediate gear 14 is a small gear 14a fixed thereto.
is engaged with the feed screw 12 via an idler gear 13.

The movable gear 17 to which the small gear 17a is fixed is the lever 1
It is rotatably attached to one end of 8.

Further, the movable gear 17 is connected to the shaft 2 of the fast-forward motor 21.
It meshes with pinion 19 which is fixed at zero.

The other end of the lever 18 is rotatably supported by a shaft 20 (in this case, the shaft 20
It is assumed that the friction between the lever 18 and the hole in the lever 18 can be ignored).

Furthermore, when the pinion 19 is rotated by a conical spring or the like, the movable gear 17 applies friction greater than enough to rotate together with the lever 18 about the shaft 20 between the lever 18 and the movable gear 17. put.

Also, this lever 18 is always at the same level when the fast-forwarding motor 21 is not working (a neutral point where it is not engaged with each of the fast-forwarding gear A15, fast-forwarding gear B16, and scanning body upper and lower gears 26).

) is regulated by a centering spring 36 attached to a pin 35 attached to the rapid-forward motor 21.

22 is a winding portion of the solenoid, and 23 is its yoke.

A clutch portion 24 is rotatably attached to the tip 23a of the yoke 23.

Further, a wire 25 is attached to one end of this clutch plate 24, and this wire 25 is attached to a spacer 37.
The pin 4 contacts the pulley 38 which is rotatably attached to the tip of the spacer 39, changes direction by almost 90 degrees, and attaches the pin 4 to the tip of the spacer 39.
One end is tied to a tension spring 33 fixed to the scanning body holder support angle 34b via a lever 32 rotatably supported at 0, so that the solenoid is regulated in one direction. The other end 24 of the clutch plate 24
A is made so that it does not come into contact with the intermediate gear 14, and when the solenoid is working, it comes into contact with the intermediate gear 14 and is made so that the intermediate gear 14 does not rotate.

As mentioned above, one end of the lever 32 is connected to the pin 4 at the tip of the lever 39.
It is rotatably supported at 0.

At the other end? A scanning body upper and lower gear 26 that can mesh with the 'bJh gear 17a is rotatably supported.

The scanning body upper and lower gears 26 operate in a non-contact manner even when the solenoid is activated and the fast-forwarding motor 21 rotates and the small gear 17a fixed to the movable gear 17 rotates and meshes with the fast-forwarding gear A15. in position.

Further, when the solenoid is activated, the scanning body upper and lower gears 26 are barked to such an extent that they come into contact with the small gear 17a fixed to the movable gear 17 when the rapid-forward motor 21 is not activated.

Further, a gear pulley 27 is fixed to the scanning body upper and lower gears 26, and the driving force transmitted to the scanning body upper and lower gears 26 is transmitted to the cam 29 by a tying belt 28 (the gear pulley on the cam 29 side is not shown). .

The scanning body holder 30 is rotatably supported by the scanning body holder support angle 34b via a pin 41.

Reference numeral 31 denotes a scanning body for collecting signals from the recording disk 5, and is fixed to the scanning body holder 30.

Reference numeral 34 denotes a carriage on which the spacer 37, the spacer 39, an angle 34a to which the fast-forward motor 21 is fixed, a scanning body holder support angle 34b1, a scanning body holder support angle 34b1, a solenoid, etc. are mounted, and two guide rods 42. .43 lead screw 1
2 so as to be movable in the left and right direction.

In the state shown in FIG. 1, the winding 22 of the solenoid is not energized, so one end 24a of the clutch plate 24 is out of contact with the intermediate gear 14 due to the action of the tension spring 330.

Further, the scanning body upper and lower gears 26 supported by the lever 32 are in a non-contact position even when the fast feed motor 21 operates and transmits the driving force to the fast feed gear A15.

Further, the scanning body 31 is supported at a position apart from the recording disk 5 via the cam 29 and the scanning body holder 30 by the action of a return spring 440.

In this state, if the fast-forward motor 21 is energized to rotate clockwise, the fast-forward gear A15 and the fast-forward gear 816
Centering spring 3 at the level where it does not engage (neutral point)
The small gear 17a fixed to the movable gear IT, which is regulated by the gear 6, has a moderate friction on the movable gear 17, so the driving force transmitted to the pinion 19 is applied to the lever before rotating the movable gear 17. 18 together with centering spring 36
It rotates toward the rapid feed gear 15 around the shaft 20 against the

Then, before meshing with the scanning body drive gear 26, the rapid feed gear A
45 (when engaged, a dog friction is generated between the pinion 17a and the fast-forwarding gear 150 due to the force of the lever 1B&- to rotate, so an appropriate pressing force is applied between the pinion 17a and the fast-forwarding gear A150. By the way, lever 18
Provide a stopper to stop the

This stopper is not shown.

Also, the same applies to the fast feed gear B'16 side L.),
Once the lever 18 has stopped, the movable gear 17
The driving force of the fast-forwarding motor 21 is transmitted to the fast-forwarding gear A15 against the friction applied to the small gear 15a, the intermediate gear 1
4. The signal is transmitted to the idler gear 13 via the small gear 14a, and the idler gear 13 rotates clockwise when viewed from this figure.

Then, the feed screw 12 meshing with the idler gear 13 functions as a rack, and the carriage 34 moves to the right.

If the fast-forward motor 21 is energized to rotate counterclockwise, the driving force transmitted to the small gear 17a is transmitted to the fast-forward gear 816, contrary to the above, and the idler gear 13 is rotated counterclockwise. and rotate counterclockwise.

Therefore, the carriage 34 moves to the left.

That is, since the carriage 34 can be moved in the left-right direction depending on the direction of rotation of the fast-forward motor 210, the scanning body 31 can be set at any position in the radial direction of the recording disk 5.

FIG. 2 shows the recording and reproducing state, in which the winding 22 is energized, so the clutch plate 24 is attracted to an iron core (not shown) inside the winding 22 against the tension spring 33.

As a result, the intermediate gear 14 is held by the clutch plate 24a.

As a result, the idler gear 13 and the rotating feed screw 12 are in a nut-screw relationship, and the carriage 34 rotates the recording disk 5 by 120 rotations of the feed screw (that is, in synchronization with the 40 rotations of the turntable). Sent toward the inner circumference.

In addition, when the solenoid is in operation, the scanning body drive gear 26 is pulled to the extent that it meshes with the small gear 17a located at the neutral point.

When the fast-forwarding motor 21 is rotated clockwise in this state, this driving force is transmitted to the scanning body upper and lower gears 26 and passes through the gear pulley 27 and the timing belt 28 to the cam 29.
The rotation is transmitted and the cam 29 rotates against the return spring 44, and the scanning body 31 is pressed against the recording disk 5 via the scanning body holder 30 which is in contact with the outer periphery of the cam 29.

When the scanning body 31 is pressed against the recording disk 5, this state is maintained by, for example, passing a restraining current to the fast-forward motor 21.

(It is assumed that the winding 22 and the fast-forward motor 21 are energized at the same time or immediately after the solenoid is activated.

) Recording and reproduction are performed through this series of operations.

Furthermore, when the recording and playback is temporarily stopped, the fast forward motor 21 and the solenoid are not energized, as shown in FIG. Since the gear A15, the fast feed gear B16, and the pinion 17a are not in contact with each other, the idler gear 13, the pinion 14a connected thereto, and the intermediate gear 1
4, small gear 15a, small gear 24a, fast feed gear A15,
The friction between the fast feed gear B16 and the friction between the two guide rods 42 and 43 and the carriage (this is considerable).

), the carriage 34 is in a stationary state.

As described above, the present invention uses the screw for constant-speed feeding of the scanning body during recording and reproduction as a rack when the scanning body is fast-forwarded, and also connects the fast-feeding motor of the scanning body to the recording disk of the scanning body. It is also used as a drive source for separation motion, and with a simple configuration, it is possible to perform constant speed drive, fast forward drive, and movement toward and away from the recording disk during recording and reproduction of the scanning body.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views of essential parts of an embodiment of the present invention, respectively, showing different operating states. 5... Recording disc, 6... Turntable drive motor, 12... Feed screw, 13...
...Idler gear, 14...Intermediate gear, 1
5, 16... Rapid feed gear, IT... Movable gear, 18... Lever, 21... - Rapid feed motor, 22... Solenoid winding line, 24・
...Clutch plate, 29...Cam, 32.
...Lever 30' ...°Scanning body holder 3
1...Scanning object.

Claims (1)

[Claims] 1. A feed screw that rotates in accordance with the rotation of the recording disk, a carriage that can slide along the feed screw, a scanning body that is provided on the carriage so that it can approach and separate from the recording disk by a vertical drive mechanism, and an idler gear rotatably supported on the carriage so as to be always engaged with the feed screw; a rotation preventing means for preventing rotation of the idler gear when the scanning body is not in rapid motion; and an idler gear disposed on the carriage. Interlocked with the motor and the start of rotation drive of the motor,
a first clutch means for transmitting the rotational force to the idler gear; a second clutch means for transmitting the rotational force of the motor as a driving force to the vertical drive mechanism; A recording disk scanning body driving device comprising driving means for respectively operating two clutch means.