JPS6316802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed reduction device for an automatic record player, and its purpose is to return a tone arm from the end position of a record using a gear with a small diameter, and to reduce the speed of a record. The object is to enable movement to the performance start position.

Generally, in automatic record playing devices, the driving force for returning the tone arm from the record playing end position or moving it to the record playing start position is generated by meshing with a small gear directly connected to the turntable. Many of them are configured to reduce the speed and take out the material using a large gear, and the reduction device requires a large gear with a large diameter in order to obtain a large reduction ratio. As a result, the entire mechanism for the automatic record player has become larger and the cost of materials has increased (see Japanese Patent Publication No. 50-3923, Japanese Patent Publication No. 50-24602, etc.).

The present invention eliminates such conventional drawbacks, and will be described below with reference to drawings of embodiments.

FIG. 1 shows an example of the configuration of an automatic record playing device of the present invention, in which 1 indicates a turntable 2.
It is a small gear that rotates together with the gear, and a portion thereof is provided with an engaging convex portion 1a. Numeral 3 is a large gear that meshes with the small gear 1, and a part of the large gear is provided with a concave toothless portion 3a for preventing constant meshing with the small gear 1. Reference numeral 4 denotes a starting link which is attached to the large gear 3 so as to rotate about the shaft 5, and the tip thereof engages with the engagement convex portion 1a of the small gear 1 to connect the small gear 1 and the above. A pawl portion 4a is provided for causing meshing with the large gear 3. Numeral 6 is a friction link attached to the large gear 3 so as to rotate about the shaft 5 in the same manner as the starting link 4, and has a protrusion 6a at its tip that is pushed by the starting rod 7. It is provided. When the projection 6a at the tip of the friction link 6 is pushed by the activation rod 7, the claw portion 4a of the activation link 4 engages the engagement convex portion 1 of the small gear 1.
a to cause the small gear 1 and the large gear 3 to mesh with each other. The large gear 3 is attached to one end of a rotating shaft 15 that is supported on the base plate 9, and has a connecting gear 16 at the other end of the rotating shaft 15. Reference numeral 8 denotes a driving gear rotatably supported by the base plate 9, and meshes with the connecting gear 16. The number of teeth of this drive gear 8 is set to be a multiple of the number of teeth of the connection gear 16, and the large gear 3 and the small gear 1 mesh with each other and rotate several times, so that the large gear 3 becomes free from the small gear 1, the drive gear 8 rotates once. Reference numeral 10 denotes a feed link provided on the lower surface of the substrate 9 so as to be able to rotate around the rotation shaft 15, and an engaging portion 10a provided at one end thereof engages a cam provided on the drive gear 8. 8a, 8b, and 8c, respectively, and a pressing piece 10b provided at the other end.
is projected upward from the window 9a of the substrate 9. And the pressing piece 10 of the feed link 10
b corresponds to the pressing piece 4b of the activation link 4 which is rotatably attached to the large gear 3 and projects downward from the window 3b thereof. This feed link 10
The engaging portion 10a is the cam portion 8 of the drive gear 8.
a, 8b, and 8c, and by pushing the pressing piece 4b with the pressing piece 10b, the starting link 4 is rotated, and the small gear 1 and the large gear 3 are engaged with each other. It's starting to cause a lot of trouble. Reference numeral 11 denotes a center spindle provided at the center of the small gear 1, and a record feeder 12 is provided on the top of the center spindle for feeding records placed on the turntable 2 one by one. The record feeder 12 is pressed by a pressing piece 10c of the feed link 10, and when the engaging portion 10a abuts the cam portion 8c and the feed link 10 rotates, the engaging portion 10a is pressed against the pressing piece 10c of the feed link 10. When the portion 10a contacts the cam portions 8a and 8b and the feed link 10 rotates, the feed link 10 is rotated by a larger amount. Reference numeral 14 denotes a connecting rod for moving the tone arm, one end of which is rotatably attached to a driving pin 13 provided on the driving gear 8.

In the automatic record playing device of this embodiment having such a configuration, the record feeder 12 and the tone arm (not shown) are driven by the rotation of the drive gear. This operation will be explained below.

First, the operation of driving the record feeder 12 will be explained. When in a stopped state, as shown in FIG. 2, the small gear 1 faces the toothless portion 3a of the large gear 3, and the feed link 10
0a is in contact with the cam portion 8a of the drive gear 8. In this state, when the start operation is performed, the turntable 2 rotates, and at the same time, the starting rod 7
When pressed in the direction of arrow A, the friction link 6 is pushed and the activation link 4 is pressed as shown in FIG.
Since the starting link 4 is rotated at the same time, the claw portion 4a of the starting link 4 comes into contact with the engagement convex portion 1a of the rotationally driven small gear 1, and the small gear 1 and the large gear 3 are meshed with each other. Therefore, the large gear 3 is the same as the small gear 1.
As shown in FIG. 4, the drive gear 8 is rotated in the direction of arrow B by the coupling gear 16 rotating together with the large gear 3. The drive gear 8 is rotated in the direction of arrow C as shown in FIG. At this time, the engaging portion 10a of the feed link 10 is connected to the cam portion 8 of the drive gear 8.
b, the pressing piece 10b is located away from the pressing piece 4b of the activation link 4;
The rotation of the large gear 3 continues. Large gear 3 above
When the rotation of the drive gear 8 continues and the toothless part 3a faces the small gear 1, the cam part 8c of the drive gear 8 comes into contact with the engaging part 10a of the feed link 10, as shown in FIG. In order to rotate the feed link 10 clockwise, the pressing piece 1
0b engages with the pressing piece 4b of the starting link 4 and rotates the starting link 4 clockwise. Therefore, the small gear 1 and the large gear 3 are meshed again by the claw portion 4a of the starting link 4. The large gear 3 is rotated by receiving the rotational driving force of the small gear 1, and the drive gear 8 is also rotated. When the feed link 10 is rotated clockwise by the cam portion 8c, the pressing piece 1
Since the record feeder 12 of the center spindle 11 is pushed by 0c, one record placed on the center spindle 11 is fed onto the turntable. Next, the operation of driving the tone arm will be explained. When the large gear 3 continues to rotate, the connecting rod 14 provided on the driving gear 8 is pulled in the direction of arrow D as shown in FIG. is moved to the playing start position on the record. This movement of the tone arm continues until the small gear again faces the toothless portion 3a of the large gear 3. In this way, the supply of records to the turntable and the lead-in operation of the tone arm are completed.

On the other hand, when the playing end position of the record is detected, the starting rod 7 is similarly pushed in the direction of the arrow A in the figure, so the rotational driving force of the small gear 1 is transmitted to the drive gear 8 via the large gear 3 and the connecting gear 16. rotated,
It supplies records to the turntable 2 and performs lead-in operation of the tone arm. Then, before the record is fed onto the turntable 2, the tone arm is returned to its original starting position in response to the movement of the connecting rod 14 in the direction of arrow E (see FIG. 4).

As described above, according to the present invention, there is provided a large gear having a toothless portion that meshes with a small gear rotated together with a turntable, and a pawl that is supported by the large gear and engages with an engaging convex portion provided on the small gear. a friction link that is coaxially supported with the starting link and responds to the movement of the starting rod, and a driving gear that meshes with a connecting gear that is coaxially provided with the large gear. One end of the feed link is brought into contact with the cam part of the driving gear, and the other end is connected to the pressing piece provided on the starting link, so that the number of large gears is To provide a reduction gear device which is capable of rotating the drive gear once in accordance with the rotation, and can move a tone arm in response to the drive gear even if the diameter of the large gear is small, and which is compact as a whole. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing an example of the configuration of an automatic record playing device of the present invention, and FIGS. 2 to 6 are explanatory diagrams of the operation of the device. 1... Small gear, 2... Turntable, 3...
Large gear, 4... Starting link, 6... Friction link, 7... Starting rod, 8... Drive gear, 10...
...Feed link, 14...Connecting rod.

Claims (1)

[Claims] 1. A large gear having a toothless part that meshes with a small gear that rotates with the turntable, a drive gear that meshes with a connecting gear coaxially provided on this large gear, and an end portion on a fulcrum that is eccentrically provided on this drive gear. a connecting rod that is supported by the gear and drives the tone arm; a starting link that is supported by the large gear and has a pawl that engages with an engaging protrusion provided on the small gear; and a starting link that is provided coaxially with the starting link. , a friction link that operates together with the starting link in response to the movement of the starting rod, is rotatably supported between the large gear and the driving gear, and an engaging portion at one end thereof is connected to the cam of the driving gear. and a press piece at the other end is connected to the press piece provided on the activation link, and the feed link is operated in response to the cam part of the drive gear. The speed reduction device for an automatic record player is configured such that the starting link is operated and the claw portion thereof is engaged with the engaging convex portion of the small gear.