JPS6245341Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement for protecting the needle system of a video disc player, particularly a needle type video disc player, when the power is turned off due to a power outage or the like during play.

In a needle-type video disc player, if the power is turned off during play due to a power outage or accidentally unplugging the power outlet, the needle will be in contact with the video disc and the disc will have stopped rotating. If the needle is rotated again when the power is turned on, the needle tip will be destroyed, so some kind of protection measure for the needle system is required.

However, with the conventional needle support elastic body of the type that lowers the needle when the power is turned off, if an attempt is made to raise the cantilever lifter during a power outage, stress will always be applied to the needle support elastic body. Therefore, the elastic properties of the elastic body deteriorate. Therefore, when the power is turned off, it is necessary to move the arm cage supporting the needle system out of the disk and lower the needle.

However, there is no conventional device with a configuration that allows the needle cantilever to rise and the arm cage to return when the power is off.Also, configurations using batteries or large-capacity capacitors are conceivable, but they are expensive. Not only that, but there are also problems with durability and maintenance, especially when batteries are used.

The present invention was made to improve the problems of the prior art, and when the power is turned off due to a power outage etc. during play, the arm cage and needle system can be moved by using the inertia energy of the disk drive system such as the player. The needle system is protected by returning the needle to the starting point.

The present invention will be explained below with reference to the embodiments shown in the drawings. In FIGS. 1 and 2, 1 is an arm cage, 2 is a cantilever, 3 is a slide motor, 4 is a pulley, 5 is a worm, and 6 is a Worm wheel, 7 rope driven drum, 8,8'
is a rope roller, 9 and 10 are idlers, 11
12 is a lever, 12 is an electromagnetic plunger, 13 is a return spring, 14 is a rope, and 15 and 16 are rollers.

The arm cage 1 is driven by a slide motor 3 to rotate a drum 7 via a pulley 4, a worm 5, and a worm wheel 6, and is linearly fed by a rope 18 wound between the drum and a roller 8. A cantilever 2 is provided on the arm cage, and a needle 23 is attached to the tip of the cantilever 2.

The idler 9 is attached coaxially with the drum 7, and a lever 11 is attached to the shaft of the idler 10, which is placed opposite to the idler. It is connected to the plunger 12 and attached to a return spring 13.

The idler 10 is interlocked with a playter rotation center 20 and a belt 21.

The slide motor 3 is movable in the direction of the arrow, and is configured to drive and decelerate the pulley 4 with a belt 22.

One end of the rope 14 is locked to the worm 5, and the other end is fixed to the lever 11 via rope rollers 15, 16 as shown. Further, a spring 24 is engaged with the support base 3' of the slide motor 3.

Next, on the arm cage 1, below the needle 23, the tip of a lifter lever 26 is disposed opposite to it, as shown in FIG. The rear end portion is held down by a lifter lever presser 28 and is engaged with an arm 27.

The arm 27 is provided so as to be movable up and down by hinges 29 and 29', and is further engaged with a spring 30, and a rope 33 that is latched to the lever 11 via rope rollers 31 and 32. attached to the arm.

When playing with the power turned on, the electromagnetic plunger 12 is energized, so the lever 17 is attracted in the direction of arrow A, the idlers 9 and 10 do not engage, and there is a constant gap between them. Clearance exists. Therefore, the arm cage 1 is linearly moved by the slide motor 3 as described above.

On the other hand, when the power is turned off due to a power outage, etc., the electromagnetic plunger 12 becomes de-energized and there is no attractive force acting on the lever 17, so the bias force of the return spring 13 causes the lever 17 to move in the direction of arrow B. When rotated, the idler 10 engages the idler 9. At this time, since the rotational energy of the playter does not go to zero at the same time as the power is turned off and remains, the idler 9 is driven and the arm cage 1 is returned to the starting point.

In this case, if the worm 5 and the worm wheel 6 are engaged, the above-mentioned return is impossible, so the rope 14 is used to release the worm 5 and the worm wheel 6. That is, when the power is turned on, the rope 14
is locked to the lever 11, so it is pulled in the direction of arrow C to engage the worm 5 and the worm wheel 6. However, when the power is turned off, the lever 11 returns as described above and the rope 14 is loosened, the motor 3 and worm 5 are pulled in the direction of arrow D by the bias force of the spring 24, and the worm 5 and worm wheel 6 are no longer engaged.

Next, at the same time as the above-mentioned return of the arm cage 1, the needle 23 is lifted as described below.

That is, during play, the arm 27 is at the top because the rope 33 is pulled by the lever 11, but when the power is turned off, the electromagnetic plunger 12 is de-energized and the rope 33 is pulled by the lever 11. Since the arm 27 is no longer pulled by the arm 27 and loosens, the arm 27 is lowered by the bias force of the spring 30. As a result, the rear end of the lifter lever 26 is lowered, and its tip is raised about the hinge 34 to lift the needle 23.

As is clear from the above explanation, according to the present invention, when the power is turned off due to a power outage, etc., the remaining rotational energy of the player of a video disc player can be used to return the arm cage to the starting point and lift the needle. As a result, the needle system can be protected reliably, and the device of the present invention is also advantageous in terms of cost, durability, and maintenance compared to conventional devices.

Incidentally, the remaining energy of the rotation of the playter is dissipated by the brake being applied due to the slip between the idlers 9 and 10 after recovery.

Furthermore, the present invention is not limited to the above-mentioned needle-type video disc player, but in short, the present invention is not limited to the above-mentioned needle-type video disc player, but in short, the present invention is applicable to a mechanical return system that uses rotational energy in equipment that requires a rotation system, such as a 33.3 [rpm] linear tracking arm or It can be applied as a power outage countermeasure for the recovery system of the optical stylus portion of an optical disc player.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are system diagrams each showing an embodiment of the present invention. 1... Arm cage, 3... Slide motor, 5... Worm, 6... Worm wheel,
9,10...Idler, 11...Lever, 12...
...Electromagnetic plunger, 13...Returning spring.

Claims (1)

[Claims for Utility Model Registration] (1) A means for linearly feeding an arm cage that holds a needle, a means for driving the linear feeding means, a means for transmitting plater rotation to the linear feeding means, and when the power is turned off. A video disc player, comprising actuating means for engaging the transmission means with the linear feeding means and separating the driving means from the linear feeding means, and means for lifting the needle when the power is turned off. (2) The video disc player according to claim 1, wherein the lift means is adapted to be linked to an actuating means. (3) The actuating means has an electromagnetic plunger that is de-energized when the power is turned off, and the plunger is configured to engage the transmission means with the linear feeding means and disconnect the driving means. A video disc player according to claim (1) of the utility model registration claim.