JPH0516104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an arm drive device for a record player that is capable of playing both sides of a record disc using a single linear tracking arm.

<Prior art> A linear tracking arm generally has a supporting portion that can slide freely on a linear rail, and the needle of the cartridge moves linearly on the diameter line of the record. It is configured as follows. This poses no particular problem in the case of single-sided performance, but in order to be able to perform double-sided performance with a single arm, the structure becomes extremely complex, and a straight rail is problematic for double-sided performance. In addition, to solve this problem, a method using a curved rail has been proposed, but since the slider with the arm base attached is driven while contacting the curved part of the rail, it becomes a point contact, which causes problems when the player plays. The problem is that rattling occurs and normal linear tracking performance may not be possible.

<Object of the Invention> The present invention focuses on the above-mentioned problems, and an object of the present invention is to provide an arm drive device for a record player that can perform good double-sided performance using a single linear tracking arm using a straight rail. It was done for a purpose.

<Structure of the Invention> In order to achieve the above-mentioned object, the present invention provides a rail located on the outer periphery of a record disc and installed parallel to the tangential direction of the record disc, and a rail disposed at the end of this rail. A driving rope is stretched parallel to the rail via a reversing pulley, and an arm stand to which a linear tracking arm is attached is supported by a slider so as to be able to slide freely on the rail.
In an arm drive device that connects an arm stand and a drive rope to drive a linear tracking arm, the arm is driven by a rotating shaft section provided perpendicularly to the moving direction of the slider in a plane containing the record. The stand is rotatably supported on a slider so that the linear tracking arm can be placed on both the front and back sides of the record, and the arm stand and the driving rope It is characterized by a structure in which the arm base is inverted by 1° as the connecting portion connecting the two moves in an arc along the pulley.

<Example> Hereinafter, the present invention will be specifically explained with reference to an illustrated example.

In the figure, 1 is a turntable, 2 is a phono motor that drives the turntable 1 with a belt 3, 4 is a record mounted on the turntable 1, 5 is a linear tracking arm, and the first
As shown in the figure, the record disc is supported in a vertical position, and the linear tracking arm 5 is arranged in such a position that the longitudinal direction of the arm is vertical. Note that support structures for the turntable 1, phono motor 2, etc. are not shown. 7 is a linear rail, 8 is a driving part board parallel to the rail 7, the rail 7 and the driving part board 8 are overlapped and integrated, and are mounted above the record disc 4 by a support structure (not shown). placed horizontally. 9 is a reversing pulley pivotally supported by a shaft 9a perpendicular to one end of the drive unit board 8; 10 is an arm drive unit provided on a mounting plate 8a formed at the other end of the drive unit board 8; 11 is a drive unit; It is a rope for use. The arm drive unit 10 includes a drive motor 12, a worm 14 rotated by a belt 13, a drum 15 having a worm wheel 15a that engages with the worm 14, and a drive rope 11 wound around the drum 15.
is looped around the reversing pulley 9 via the direction changing pulley 16 in the middle.

19 is a slider that is slidably attached to the rail 7, and 20 is an arm stand. A vertical rotating shaft 21 is caulked to the arm stand 20, and is inserted into the shaft hole 22 of the slider 19 to prevent it from coming off. As a result, the arm stand 20 is rotatably supported by the slider 19. The linear tracking arm (hereinafter simply referred to as arm) 5 is attached to the arm stand 20 by inserting the shaft 24 of the support 23 into the support hole 25 of the arm stand 20, and is operated by the up-down operation section 26. ing. The arm stand 20 has a connecting portion 2 at the tip of a protruding piece 20a that extends to a position where it touches the driving rope 11.
7 is formed, and the driving rope 11 is connected to the connecting portion 27. Reference numeral 31 denotes a tension spring, and a spring hook 32 is provided at a position eccentric from the shaft hole 22 of the slider 19 in the sliding direction, and a spring hook 32 is provided at a position eccentric from the rotating shaft 21 of the arm stand 20 at right angles to the sliding direction. The locking portion 36 or 37 of the arm stand 20 hits the stopper 34 or 35 provided on the slider 19. The arm stand 20 is fixed in position. This position corresponds to the position where the arm 5 plays the front or back side of the record 4.

The arm 5 has a tension spring 41 suspended between a spring hook 39 provided on the balance weight 38 and a spring hook 40 provided on the arm stand 23, and the arm 5 and the balance weight 38 are balanced in advance. A predetermined stylus pressure is applied by a tension spring 41. However, this is not necessary in the case of a system in which the record 4 is supported vertically and performance is performed on both sides.

<Operation> Next, the operation will be explained. The states shown in FIGS. 1 to 3 show the state in which the arm 5 has advanced halfway and is in the cue-up state when the front surface of the record disc 4 is being played. The arm 5 is moved by the arm drive unit 10.
It is carried out by. That is, when the driving motor 12 rotates and the worm wheel 15a and therefore the drum 15 rotate counterclockwise in FIG. 2 via the worm 14, the looped driving rope 11 moves, and this movement Connecting part 27 according to
The arm stand 20 connected to the driving rope 11 is pulled and moves to the left in FIG. 2 together with the slider 19. When it moves to the leftmost end in the queue-up state and reaches a position where the axis 9a of the reversing pulley 9 and the rotation axis 21 of the arm stand 20 coincide, the connecting part 2
7 contacts the reversing pulley 9 and rotates along its outer periphery along with the driving rope 11 in an arcuate trajectory, and the arm stand 20 is accordingly reversed by 180 degrees. At this time, the tension spring 31 applies a rotational force in the counterclockwise direction in FIG. 3 to the arm stand 20, and the locking portion 37 hits the stopper 35, so that the arm stand 20 is held in an inverted position. The arm 5 now moves to the playing position on the back side of the record 4, and when the drive motor 12 continues to rotate in the same direction, the arm stand 20 moves to the right in FIG. It becomes possible.

From this state, drive motor 1 in the opposite direction from now.
2, the arm stand 20 moves in the opposite direction, turns over to the front side, and the arm 5 moves to the front side.

That is, by moving the driving rope 11, the arm 5 can be not only moved but also reversed. This makes it possible to perform as desired.

<Effects of the Invention> According to the present invention, it is possible to perform linear tracking performance with a single arm on both sides of a record using a straight rail, and the simple structure allows for good performance without rattling of the arm. This makes it possible to perform on both sides, making it easier to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a bottom view of essential parts of the same, and FIG. 4 is an exploded perspective view of the same. 4...Record, 5...Linear tracking arm, 7...Rail, 9...Reversing pulley, 9a
...Axis, 10...Arm drive unit, 11...Driving rope, 19...Driving rope, 19...Slider, 20...Arm stand, 21...Rotating shaft, 22
...Shaft hole, 27...Connection part.

Claims (1)

[Claims] 1. A rail is installed on the outer periphery of the record and parallel to the tangential direction of the record, and a driving rope is run parallel to the rail via a reversing pulley placed at the end of this rail. An arm stand with a linear tracking arm attached thereto is supported by a slider that can slide freely on the rail, and the arm stand and a driving rope are connected to drive the linear tracking arm. In an arm drive device for a record player, an arm base is rotatably supported on a slider by a rotation shaft provided perpendicular to the moving direction of the slider in a plane containing the record, and the linear tracking arm is moved to the record player. The connecting part between the arm stand and the driving rope moves in an arc along the reversing pulley at a position where the rotating shaft coincides with the axis of the reversing pulley. The old arm stand
An arm drive device for a record player, characterized in that it is configured to be reversed by 180°.