JPS5834030B2 - 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 scanning body is configured to easily move the scanning body towards and away from the recording medium, to carry out steady feeding operations in the radial direction of the recording medium, and to perform rapid feeding operations.

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 the turntable 4, 6 is a drive motor for the turntable 4, and the other end of the shaft 7a is connected to the drive motor of the turntable 4. has a worm portion 7b, with which a worm wheel 8 is engaged.

9 is a shaft (bearing part omitted) of the worm wheel 8, and a worm 1o is fixed to the other end thereof, and a worm wheel 11 fixed to a screw rack 12 is engaged with the shaft 9.

This allows the screw rack 12 to constantly rotate in synchronization with the rotation of the turntable 4.

A pinion 13 is always engaged with the screw rack 12 and is fixed to a shaft 14 supported by a bearing (bearing not shown) on a carriage 29, and a disk 15 is fixed to the other end of the shaft 14.

16 is a winding portion of the solenoid, 17 is its yoke, and the yoke 17 is fixed to the carriage 29.

18 is a clutch plate bent into an almost U-shape, and yoke 1
A tension spring 33 is attached to the yoke 17 so as to be slightly rotated by the operation of the solenoid.
One end is configured to hold the disc 15 in a non-contact manner when the solenoid does not work, and the other end is configured to hold the disc 15 in a non-contact manner as shown in FIG. A lever 35 provided with a lever 35 is rotatably supported by a pin 37.

Numeral 19 is a fast-forwarding motor fixed to the carriage 29, and a gear 2o is fixed to its shaft 34.
The other end of the lever 35 is rotatably supported.

The intermediate gear 21 provided on the lever 35 is the gear 2
When the clutch plate 18 rotates with the operation of the solenoid described above, it rotates around the outer circumference of the gear 20, and the small gear 2 provided on the intermediate gear 21 rotates around the outer circumference of the gear 20.
1a is configured to disengage from the gear 22 and engage with the gear 26.

22 is a fast forward gear that can mesh with the gear 21a, and is integrally fixed with an idler 23 that can run on a rail 24 provided in a part of the case, for example.

Reference numeral 25 denotes a scanning body upper and lower gear that can mesh with the small gear 21a, and a gear pulley 26 is fixed thereto.

A timing belt 27 transmits the driving force transmitted to the scanning body upper and lower gears 25 to the cam 28 (the gear pulley on the cam 28 side is not shown).

40 is a return spring for the cam 28. Reference numeral 29 denotes a carriage on which a fast-forward motor 19, a solenoid, etc. are mounted, and it is supported by two guide rods (not shown) so as to be movable in the left and right directions along the screw rack 12, and a scanning body holder 31 is attached to the pin 30 at the tip of the carriage. It is rotatably supported through.

Reference numeral 32 denotes a scanning body for collecting output from the recording disk 5, and is fixed to the scanning body holder 31.

Next, this operation will be explained.

In the state shown in FIG. 1, since the winding 16 is not energized, the clutch plate 18 does not fix the disk 15 due to the action of the tension spring 33, and also moves the small gear 21a fixed to the intermediate gear 21 to the fast-forwarding gear. 22 (see FIG. 4), the scanning body 32 is supported at a position apart from the recording disk 5 via the cam 28 and the scanning body holder 31 by the action of a return spring 40.

As a result, if the fast-forward motor 19 is energized, the gear 20,
Rotation is transmitted to the idler 23 from the intermediate gear 21, small gear 21a, and fast feed gear 22, and while the scanning body 32 is separated from the recording disk 5, the carriage 29 can be moved in the left and right direction according to the rotational direction of the fast feed motor.In other words, the diameter of the recording disk 5 The scanning body 32 can be set at any position in the direction.

Note that in this state, since the disk 15 is not fixed, the pinion 13 can freely rotate on the rotating screw rack 12.

Figures 2 and 3 show recording and reproducing conditions, and the winding 1
6 is energized, the clutch plate 18 is connected to the tension spring 33
It is attracted to an iron core (not shown) inside the winding 16 against the force.

As a result, the disc 15 is held by the clutch plate 18, and the rotation of the pinion 13 is disrupted.

Further, the small gear 21a fixed to the intermediate gear 21 is disengaged from the gear 22 by the operation of the clutch plate 18, and is engaged with the scanning body upper and lower gears 25.

From this state, if the fast-forward motor 19 is energized, the gear 20
, intermediate gear 21. Small gear 21a, scanning body upper and lower gears 25,
The rotation is transmitted to the cam 28 via the gear pulley 26 and the timing belt 27, and the cam 28 rotates against the return spring 40, rotating the scanning object holder 31 that is in contact with the outer periphery of the cam 28 to perform scanning. The body 32 is pressed against the recording disk 5.

When the scanning body 32 is pressed against the recording disk 5, this state is maintained by, for example, passing a restraining current to the fast-forward motor 19.

(It is assumed that the winding 16 and the rapid-forward motor 19 are energized almost simultaneously, for example, by one S-W.) On the other hand, the pinion 13 whose rotation is bundled is connected to the rotating screw rack 12 and the relationship between the nut and the screw. Carriage 29
is sent toward the inner circumference of the recording disk 5 by the rotation of the screw rack 12 (that is, in synchronization with the rotation of the turntable 4).

Recording and reproduction are performed by this series of operations.

Note that the relationship between the idler 23 and the rail 24 shown in FIGS. 1 and 2 may be replaced by a gear and a rack.

As described above, according to the present invention, constant-speed driving, fast-forward driving, and movement of the scanning body toward and away from the recording disk during recording and reproduction can be performed with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a perspective view of the same device in another operating state, FIG. 3 is a perspective view of the same essential parts, and FIG. FIG. 5... Recording disc, 12... Feed screw,
13...Pinion, 16...Solenoid winding M, 19...Motor, 21...Intermediate gear, 23...Idler, 24... ...-
Rule, 28...cam, 29...carriage, 31...scanning body holder 32...
...Scanning object.

Claims (1)

[Claims] 1. A feed screw 12 that rotates in accordance with the rotation of the recording disk;
a carriage that is slidable along the feed screw; a scanning body that is provided on the carriage so as to be able to approach and separate from the recording disk by a vertical drive mechanism; a supported pinion, a rotation preventing means for preventing rotation of the pinion at times other than when the scanning body is being fast-forwarded, a carriage fast-forwarding means for slidingly moving the carriage by transmitting rotational force, and provided on the carriage. A clutch means for transmitting the rotational force of the motor to the carriage fast-forwarding means when the carriage is fast-forwarded, and a clutch means for transmitting the rotational force of the motor to the vertical drive mechanism during recording or reproduction to bring the scanning body into contact with the recording disk. A recording disk scanning body drive device. 2. In the recording disk scanning body driving device according to claim 1, the operations of the pinion rotation prevention means, the clutch means for transmitting the rotational force of the motor to the carriage rapid-forwarding means and the vertical drive mechanism are controlled by a single solenoid. The device is configured to be driven by the