JPS6323767Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record end detection wire support device for a record player.

FIG. 1 shows a conventional device of this type, in which a stylus (not shown) attached to the tip of the tone arm 14 advances to the innermost circumference of the record 11 and enters the lead-out groove, then the shaft 14a of the tone arm 14 One end 3a of the detection wire 3 is pushed out in the direction of arrow A at the lower bent portion 2a of the plate 2 fixed to the plate 2, and the other end 3b pushes the lower bent portion 4a of the clutch 4.
This clutch 4 is rotatably mounted on a cam gear 7, and when the clutch 4 rotates counterclockwise, its upper bent portion 4b engages a guide cam 5 that can rotate coaxially with the clutch 4. Rotate counterclockwise and push out. When the guide cam 5 is pushed out by a predetermined amount or more, the upper bent portion 5a of the guide cam 5 is caught on the protrusion 6a of the turntable gear 6. Since the turntable gear 6 is rotating clockwise, the guide cam 5 is pushed counterclockwise about the rotation shaft 19, and the cam gear 7 meshes with the turntable gear 6 and rotates. A pin 20 is attached to the rotating shaft 19 of the cam gear 7.
are fitted, and since the pin 20 is fixed to one end of the link 8, the link 8 rotates counterclockwise.
Since the lower pin 21 attached to the auto cam 9 is inserted into the hole at the other end of the link 8, the auto cam 9 also rotates counterclockwise as the link 8 rotates.
This auto cam 9 is provided with a slope 22 on its outer periphery, and the shaft 10a of the arm lifter 10 is in contact with this slope 22, so that the auto cam 9
As the tone arm 14 rotates, the arm lifter 10 rises along the shape of the slope 22 and the tone arm 14
, and lift the stylus tip from the record 11.

When the auto cam 9 rotates further, the reversing cam 12 rotatably attached to the pin 23 of the auto cam 9
presses the pin 13 of the plate 2 and rotates the plate 2 counterclockwise, so the tone arm 14
At this time, the tone arm 14 rotates counterclockwise and returns to the armrest position, and at this time, the toothless portion of the cam gear 7 faces the turntable gear 6, and the movement of the tone arm 14 stops.

Also, at almost the same time, the switch lever 16 that is in contact with the outer periphery of the downward protrusion 7a of the cam gear 7
falls into the groove 7b on the outer periphery, so the switch lever 1
6 rotates clockwise and pushes the movable part of the micro switch 17 to turn it off, the turntable gear 6 stops, and the record playing ends.

The present invention relates to the detection wire 3 in the above configuration.
Regarding this, as described above, the detection wire 3 is pushed by the lower bent portion 2a of the plate 2 and pushed in the direction of the arrow A. In order to do this, a separate molded product 18 is conventionally fixed to the fixing portion with a screw 24 as shown in FIG.
The detection wire 3 is supported by the through hole 25 a of the press part 25 .

However, since the through holes in the pressed parts are formed by cutting them with a press, the contact surface with the detection wire is rough and has a large frictional resistance, which causes sound distortion when playing 17cm records. In other words, there are 17cm and 30cm records, and the position of the lead-out groove for each record end is 17cm.
The difference between cm records and 30cm records is that 17cm records are closer to the turntable shaft, so the detection wire for detecting the end of a record is usually pushed out in the direction of arrow A by the lead-out groove of the 30cm record. Designed. Therefore 17
When playing a cm record, the stylus tip of a 17cm record has not yet reached the lead-out groove, but when it reaches a position corresponding to the lead-out groove of a 30cm record, the detection wire 3 is pushed out, and at this time the stylus tip of the 17cm record is not yet reached. During a performance, the detection wire 3 moved over a rough surface with high frictional resistance, which was discarded by the tip of the stylus, resulting in distortion of the sound.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a detecting wire support device for a record player that easily reduces sound distortion.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, the detection wire 3 is supported by holders 18, 18 made of molded products, and the portions of the holders 18, 18 that support the detection wire 3 are arranged in a pair of opposing positions, as seen in the enlarged view of FIG. Projection 1
8a, 18b and the groove between them, the contact portion of the detection wire 3 is formed on an arcuate surface 18c.

With such a configuration, according to the present invention, the friction during movement of the detection wire can be reduced, and the lateral pressure on the needle tip can also be reduced, and sound distortion can therefore be significantly reduced, making it suitable for practical use. It's convenient.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a perspective view of the main part of FIG. 3...Detection wire, 18...Holder, 18
a, 18b...Protrusion, 18c...Circular surface.

Claims (1)

[Scope of utility model registration request] In response to the stylus tip entering the lead-out groove on the innermost circumference of the record 17, the plate 2 fixed to the tone arm 14 moves the detection wire 3 to engage the cam gear 7 and the turntable gear 6. In the record player in which the tone arm 17 is returned to the rest position, a pair of protrusions 18a and 18b facing each other with the detection wire in between, and a groove between the protrusions that contact the detection wire 3 to support the wire. The detection wire 3 has a circular arc surface.
A detection wire support device for a record player, characterized in that a guide portion 18c is formed of an integrally molded product.