JPS58177563A - Driving device of pickup arm or the like of record player - Google Patents

Abstract

PURPOSE:To obtain a sufficiently large reduction gear ratio even when a main gear is sized small, by putting a pickup, etc., into operation through a two- stage reduction gear mechanism by the rotating force of a turntable. CONSTITUTION:When a starting rod 8 moves to left to press a friction link 6, a starting link 5 rotates counterclockwise around a shaft 7 and the main gear 4 starts rotating. When a rod driving gear 9 rotates, the main gear 4 is pressed up along an arcuate cam 9b to enage a continuous tooth part 4b with a pinion 3 and the main gear 4 rotates counterclockwise successively. When the rod driving gear 9 further rotates, an arcuate flange 9c is disengaged from a flange 4f simultaneously with a recessed part 4e engages the arcuate cam 9b, and the main gear 4 starts moving down and stops where a nontooth part faces the pinion 3. A driving rod 10 for a pickup arm, etc., moves to left and right according to the rotation of the rod driving gear 9 to operate the pickup arm, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for slowly operating a pickup arm and other mechanisms of a record player.

In a record player, the pickup arm, etc. is driven by the rotational force of the turntable's rotating shaft, but in the past, it was directly connected to a main gear that meshed with a pinion fixed concentrically to the turntable's rotating shaft. The pickup arm, etc. was driven in conjunction with the rotation of the main gear through the opened and closed doors. In general, the pickup arm needs to move very slowly compared to the rotation of the turntable, so in order to achieve a large reduction ratio, the main gear needs to be very large, which not only makes the main gear expensive. However, the disadvantage was that the record player itself had to be large.

However, in recent years, it has become necessary to make the entire record glarer extremely compact and to reduce the production cost.

The present invention was made in response to the above requirements, and
The present invention will be described in detail below with reference to the embodiments shown in the drawings.

In the figure, 1 is a substrate that supports a drive device such as a pickup arm (not shown) of the record soleyer of the present invention, 2 is a rotating shaft of a turntable (not shown), and 3 is a board that is fitted onto the rotating shaft 2. It is a pinion that is fixed together and provided directly below the turntable, and has a convex portion 3a on its upper periphery.

Reference numeral 4 denotes a main gear that meshes with the pinion 3, and a portion of its periphery, above a continuous tooth portion 4b, is provided with a toothless portion 4a for releasing the mesh with the pinion 3.

On the upper surface of the main gear 4, a starting link 5 that engages with the convex portion 3a to start meshing between the binion 3 and the main gear 4, and a known 7-reaction link 6 are rotatably mounted on a shaft 7, and the pickup is rotated. When the innermost track on the record is reached, a starting rod 8 that starts meshing between the binion 3 and the main gear 4 is configured to push the friction link 6. A rotation center shaft 4c is concentrically provided on the main gear 4, and is rotatably mounted on the substrate l. Gear teeth 4d are formed on the lower outer periphery of the rotation center shaft 4c and mesh with the teeth 9a of the rod drive gear 9 to transmit the rotation of the main gear 4 to the rod drive gear 9. A recess 4e and a flange 4 are provided below the gear tooth 4d, and engage with the upper surface of an arcuate cam 9b and an arcuate flange 9c provided below the gear tooth 9a of the rod drive gear 9, respectively. is moved up and down with the rotation of the pinion 3 to control engagement and disengagement between the pinion 3 and the main gear. The number of teeth of the main gear 4 and the number of teeth of the gear teeth 9a are multiples of the number of teeth of the binion 3 and the number of teeth of the gear teeth 4d, respectively.

FIG. 4 is a plan view of the outer circumferential surface of the rod drive gear 9, showing the mutual relationship among the cam 9b, gear teeth 9a, and seven flange 9c. When the starting rod 8 (5) moves to the left in FIG. When the convex portion 3a of the pinion 3 that is rotating in the direction collides with the convex portion 3a, the main gear 4 starts rotating.

When the main gear 4 starts to rotate, the recess 46 is in a position where it meshes with the lowest part of the arcuate cam 9b. Therefore, when the rod drive gear 9 rotates in the direction of arrow A in FIG. The continuous tooth portion 4b meshes with the pinion 3, and the main gear 4 continues to rotate counterclockwise. When the main gear 4 is in the highest raised position, the upper surface of the arcuate 7 langes 9C enters the lower surface of the 7 langes 4f to support the main gear 4 in the raised position, and
The engagement between the arcuate cam 9b and the recess 4e is released. When the rod drive gear 9 further rotates, the concave portion 4e engages with the arcuate cam 9b again, and at the same time, the arcuate flange 9C and flange 4f are disengaged, and the main gear 4 begins to descend, eventually becoming missing as shown in FIG. The gear 4 stops at the position where the tooth portion 4a faces the pinion 3. The pick-up arm drive rod 10 moves left and right with the rotation of the rod drive gear 9 to operate the pick-a-way 2 arm and the like.

In the present invention, the pick arm and the like are actuated by the rotational force of the turntable via a two-stage reduction mechanism, so even if the main gear 4 is made small, a sufficiently large reduction ratio can be achieved, and the entire record player can be In addition to being extremely compact, the mechanism is simple as the operation of the pick, arm, etc. is controlled simply by the vertical movement of the main gear 4, and the production cost is low due to advances in mass production technology for gears and cams. It has the advantage of providing an economical record P glare.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the device of the present invention, Fig. 2 is a longitudinal cross-sectional view of the device of the present invention in a state where the rotation of the turntable is not transmitted to the picker, f, etc. drive mechanism, and Fig. 3 is the rotation of the turntable. FIG. 4 is a longitudinal cross-sectional view of the device of the present invention in a state in which the rod drive gear is being transmitted to the pi, qua, pi, etc. drive mechanisms, and FIG. 4 is a developed view of the rod drive gear. 1... Board, 2... Rotating shaft, 3... Binion, 3
a...Convex part, 4...Main ear, 4g...Long tooth part, 4b...Continuous tooth part, 4c...Rotation center axis, 4d...
...Gear tooth, 4e...recess, 4t...flange, 5
...Startup link, 6...Friction link, 7.
... Shaft, 8... Starting rod, 9... Rod drive gear, 9m... Teeth, 9b... Arc-shaped cam, 9C... Arc-shaped flange, 10... Driving rod for big-up arm, etc. Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) In a record player that controls the pickup arm etc. by the rotational force of the turntable, the turning,
A pinion provided concentrically with the table rotation axis, a main gear that meshes with the binion and is driven, and a rod drive that meshes with gear teeth provided concentrically with the rotation axis of the main gear and is driven by the main gear. A drive device for a pickup arm or the like of a record player, characterized in that the speed is reduced by a gear, and the vertical movement of the main gear is controlled by the rod drive gear, thereby controlling engagement and disengagement between the binion and the main gear. . (2) A binion provided concentrically with the rotation axis of the turntable, a main gear that partially has a toothless portion and rotates when meshed with the binion and moves up and down along the direction of the rotation axis, and the main gear It is rotated by the rotation of the big arm, etc., and there is a rod drive gear that reciprocates the drive port of the big arm, etc., and a rod drive gear that reciprocates the main gear.The lower outer periphery of the rotating shaft of the main gear has gear teeth and 7 langes, and a recess between the gear teeth and the flange. In addition, on the outer periphery of the rod drive gear, there is an arc-shaped cam that engages with the recess and moves the main gear up and down by its rotation, and an arc-shaped 7 flange whose upper surface engages with the lower surface of the 7 flange. and when the main gear is in the lowest position, the toothless portion is in a position facing the binion, and the main gear and the binion are disengaged; When the shim main gear and the binion begin to engage with each other by a starting member provided elsewhere and the main gear starts to rotate, the rod drive gear rotates and the shim main gear is pushed up by the arcuate cam, and at the same time the seven langes are supported by the arcuate flange. When the main gear is fully engaged with the binion and rotates, and after completing one rotation, the main gear is no longer engaged with the seven flange of the arcuate flange and is pulled down by the arcuate cam, so that the toothless portion faces the binion. 1. A drive device for a pickup arm or the like of a record player, characterized in that the rotation of a main gear is stopped in a state where the rotation of the main gear is stopped, and the speed is reduced by the binion, the main gear, and the drive gear.