JPS5845108B2 - Pickup arm drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a pickup arm of a record player.

Various mechanisms have been devised and used as fully automatic mechanisms to automatically drive the pickup arm of a record player, but all of them are limited to the period from when the pickup arm rises from the armrest position until it performs the lead-in operation, and after the end of the performance. It is unavoidable that a predetermined period of time is required from rising above the record surface to descending to the armrest after the return operation, and therefore the operating period of the pickup arm cannot be made longer than necessary. First, it is necessary to reduce the time required for lead-in and return operations.

Therefore, the operating speed becomes too high and accurate control cannot be performed, resulting in malfunction.

There is also a method of driving using a motor that can rotate forward and reverse, but this method requires a control circuit for forward and reverse rotation of the motor, and has the disadvantage that the motor drive control circuit is complicated. be.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic pickup arm drive device that can eliminate wasted time in operating a pickup arm drive mechanism and does not require a complicated electrical control circuit.

Another object of the present invention is to provide a drive device capable of accurately performing a pick-up arm ride-in operation with a simple configuration.

Still another object of the present invention is to provide a drive device that can accurately perform lead-in and return operations of a pickup arm with a simple configuration.

A pickup arm driving device according to the present invention includes a first gear member having a gear portion extending along a predetermined line, and a drive that drives the gear portion of the first gear member to reciprocate in a predetermined section on the predetermined line. a second gear member having a gear portion extending parallel to the gear portion of the first gear member; and a pinion gear provided between the gear portions of the first and second gear members in engagement with both gears. a lever that is movable while rotatably supporting the pinion gear and rotates the pickup arm in the lead-in direction; and a second gear member that is biased in one direction of movement and brought into contact with a predetermined stopper. The present invention is characterized in that it includes a biasing means and a lowering position specifying member that designates a lowering position of a pickup arm disposed within a movement range of the lever according to the disk size when the lever is moved in the direction of the biasing force.

Another driving device of the present invention includes a first gear member having a gear portion extending along a predetermined line, and a driving means for driving the gear portion of the first gear member to reciprocate in a predetermined section on the predetermined line. , a second gear member having a gear portion extending parallel to the gear portion of the first gear member and for rotating the pickup arm in the first direction (i.e., return direction);
and a pinion gear provided between the gear portions of the second gear member to engage with both the gear portions; a lever for rotating the pickup arm in the direction), a biasing means for biasing the second gear member generally in the second direction of the pickup arm to contact a predetermined stopper, and a disc for rotating the lever in the biasing direction. A lowering position specifying member that is arranged within the movement range of the lever and determining the lowering position of the pickup arm according to the size, a defining member that defines the movement range in the opposite direction to the biasing direction of the lever, and a return instruction for the pickup arm. The invention is characterized in that it includes a prohibition member that prohibits movement of the lever in response to the movement of the lever.

Preferably, the gear portions of the first and second gear members are formed along concentric circular arcs centered on a predetermined axis, and the lever is attached to be swingable about the predetermined axis.

As another preferred example, the gear portions of the first and second gear members are formed along a straight line, and the lever is attached to be slidable on a predetermined plane.

As described above, according to the present invention, the first and second gear members and the pinion gear constitute a differential transmission mechanism, and the first gear member is moved linearly or circumferentially by an appropriate driving means. The arm is caused to reciprocate within a predetermined section, and the movement of the first gear is transmitted to the pinion gear and the second gear member, thereby horizontally rotating the arm.

The features of the present invention will be described in detail below with reference to the accompanying drawings for a better understanding.

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
It is a partial sectional view along the AA' line of a figure.

In the figure, reference numeral 1 denotes a driving cam gear having gears on its outer periphery, and a recess 2 having the shape shown in the figure is formed on one surface of the drive cam gear.

On the other hand, a gear 4a formed along an arc around the shaft 3 is provided at the tip end of the first lever 4, which is attached to be swingable around the shaft 3.

A protruding pin 4b is formed at the other end of the lever 4, and this protruding pin 4b engages with the peripheral wall surface 2a of the recess 2 of the cam gear 1.

Therefore, when the gear 1 is rotated once at a constant speed in the direction of the arrow (counterclockwise) from the position shown in FIG. As a result, the lever 4 moves from the position 4 indicated by the solid line to the position 4' indicated by the constant chain line, and is then returned to its original position by the return spring 13.

Therefore, the gear 4a performs one reciprocating rotational movement about the central shaft 3 in response to the swinging of the lever 4.

A second lever 5 is provided which is swingably attached to the shaft 3, and a gear 5a is formed on this lever 5 along an arc centered on the shaft 3.
A pinion gear 6a is provided between the first gear 4a and the first gear 4a.

A third lever 6, which rotatably supports this pinion gear 6a, is attached to be swingable about the shaft 3.

The second lever 5 is biased in the counterclockwise direction in the swing direction in this example by a spring 7, which is a biasing means, and is in a state where it comes into contact with a stopper 8 and is locked.

Further, a defining stopper 9 is provided to define the range of clockwise swing of the third lever 60.

The mechanism drives the pickup arm by engaging the PU plate 11, which is attached integrally with the horizontal rotation center shaft 10 of the pickup arm (not shown), with the tips 5b and 6b of the levers 5 and 6, respectively.

In such a configuration, for example, the cam gear 1 is configured to engage with a gear that rotates integrally with the turntable shaft and rotate only one revolution, and in response to a separately provided well-known disc size detection means, Assuming that the pin 12 is installed within the swing range of the lever 6 corresponding to the lowered position on the disk, the gear portion 4a of the first lever 4 rotates counterclockwise.

Therefore, due to the operation of the differential gear configuration, a force is exerted which tends to rotate the third lever 6 counterclockwise and the second lever 5 clockwise.

However, since the second lever 5 is biased counterclockwise by the biasing spring 7, only the third lever 6 rotates counterclockwise, and the tip 6b of the third lever 6 moves toward the PU plate 11.
drive in the same direction.

Therefore, the tone arm horizontally rotates clockwise to perform a lead-in operation.

When the tip 6b of the lever 6 comes into contact with the aforementioned pin 12, the lever 6 stops rotating, and then the second lever 5
The spring begins to rotate clockwise against the biasing spring 7.

Thereafter, the PU plate 11 is clamped by the tips 5b and 6b of the second and third levers, and stops at a predetermined lowered position on the disk, thereby completing the lead-in.

In this state, the first lever 4 is in a position 4' indicated by a chain line.

When the cam gear 1 rotates further, the gear 4a of the lever 4
rotates clockwise.

Accordingly, the second lever 5 is rotated counterclockwise by the force of the spring 7, returns to the stopper 8 position, that is, the original position, and stops.

Then, the third lever 6 rotates clockwise and the stopper 9
It comes into contact with and stops.

In this state, the first lever 4 returns to its initial state and releases the engagement between the cam gear 1 and the turntable gear.
All operations of the above mechanism are completed and the lead-in operation is completed.

Incidentally, the raising and lowering operations of the pickup arm can be performed by, for example, providing a cam surface on the cam gear 1 or a rotating plate interlocked with the cam gear 1, and engaging the cam surface with a pin for raising and lowering the pickup arm. It is clear that if the above-mentioned cam surface is appropriately designed, it will be possible to cause the pickup arm to move up and down during the lead-in operation.

Next, the case where the return operation is performed after the playback of the disc is completed will be explained.

Also at this time, the cam gear 1 is engaged with a gear that rotates together with the turntable, and is rotated counterclockwise.

Then, the pin 12 provided corresponding to the lowered position is moved from this position by a predetermined means, for example, a means for detecting that the pickup has reached the performance end position, and is placed at the position 12' shown by the dotted line, and the stopper 9 is moved. 12' by 3rd
Clamp the lever 6.

Of course, the pins 12 and 12' may be different pins.

In this state, the lever 6 is prohibited from moving, so the second lever 5 is driven clockwise against the spring 1 and moves against the plate 11' (which is at the dotted line position 11' at the end of the performance). Rotate clockwise.

Therefore, the pickup arm horizontally rotates counterclockwise and moves to the armrest position (position indicated by 11).

At this time, the first lever 4 is at a position 4' indicated by a chain line.

When the cam gear 1 further rotates, the gear 4a of the first lever 4
Since the second lever 5 begins to rotate clockwise, the second lever 5 is moved counterclockwise by the spring 7 and returns to the position where it contacts the stopper 8.

In this state, the first lever 4 returns to its original position 4, and the cam gear 1 also disengages from the gear of the turntable and stops rotating.

In the above embodiment, the gears 4a and 5a are rotated by the swinging movement of the lever 4, but it is obvious that the same effect can be obtained by a structure in which these gears are moved linearly. It is also clear that the repeat operation of the pickup arm can be easily performed by the above embodiment.

As described in detail above, in the present invention, the pickup arm can be automatically driven simply by reciprocating one of the gears that engage with the pinion gear that constitutes the differential transmission mechanism. Because there is no need to use all
Sufficient time is taken for lead-in and return operations, resulting in a highly reliable device.

Note that the means for driving the gear 4a is not limited to the configuration shown in FIG. 1, and it is clear that various modifications are possible.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a partial sectional view taken along line AA' in FIG. Explanation of symbols of main parts, 3... Central axis, 4...
...First lever, 4a...Gear, 5...
...Second lever, 5a...Gear, 6...
...Third lever, 6a...Pinion gear,
7...Biasing spring, 8,9...Stopper, 12...Pin for specifying lowering position, 12'...
...Prohibition pin, 13...Return spring.

Claims (1)

[Scope of Claims] 1. A first gear member having a gear portion extending along a predetermined line; and a driving means for driving the gear portion of the first gear member to reciprocate in a predetermined section on the line. , said first
a second gear portion having a gear portion extending parallel to the gear portion of the gear member;
a gear member, a pinion gear provided between the gear portions of the first and second gear members in engagement with both gear portions, and a pickup arm that is movable by rotatably supporting the pinion gear; a lever for rotating the second gear member; a biasing means for biasing the second gear member in one direction of movement of the gear member to abut a predetermined stopper; and a disc when the lever is moved in the biasing direction. A drive device for a pickup arm, comprising a lowering position specifying member that is arranged within a movement range of the lever according to the size and designating a lowering position of the pickup arm. 2. The pickup arm drive device according to claim 1, wherein the gear portions of the first and second gear members are formed along a straight line. 3. The gear portions of the first and second gear members are formed along concentric arcs centered on a predetermined axis, and the lever is attached to be swingable about the predetermined axis. A pickup arm driving device according to claim 1, characterized in that: 4 a first gear member having a gear portion extending along a predetermined line; a driving means for driving the gear portion of the first gear member to reciprocate in a predetermined section on the line;
a second gear member having a gear portion extending parallel to the gear portion of the gear member and for rotating the pickup arm in the first direction; and a second gear member between the gear portions of the first and second gear members. a pinion gear that is provided to engage with the pinion gear; a lever that rotatably supports the pinion gear and that is movable in a lever for rotating the pickup arm in a second direction;
urging means for urging the second gear member generally in a second direction of the pickup arm to contact a predetermined stopper; and moving the lever in accordance with the disk size when the lever is moved in the urging direction. a lowering position specifying member disposed within a range that determines the lowering position of the pickup arm; a defining member that defines a movement range of the lever in a direction opposite to the biasing direction; A drive device for a pickup arm, comprising: a prohibition member for prohibiting movement of the pickup arm. 5. The pickup arm drive device according to claim 4, wherein the gear portions of the first and second gear members are formed along a straight line. 6. The gear portions of the first and second gear members are formed along concentric arcs centered on a predetermined axis, and the lever is attached to be swingable about the predetermined axis. A pickup arm driving device according to claim 4, characterized in that: