JPH0130202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a position detection plate adjustment device for a single-point rotation type pick-up arm of a record player, and includes an adjustment board attached to a mount for horizontally rotating the pick-up arm, and a position detection plate adjusting device for a pick-up arm of a record player. The detection plate having a slit portion for detecting the needle tip position can be easily fixed after adjustment.

Conventional configurations and their problems In recent years, so-called semi-automatic players have been widely used in which the pick-up arm automatically returns to the rest position when it reaches the end of the record.

In this type of record player, it is necessary to accurately detect that the pick-up arm is located at the end of the record. For this reason, the position of the needle tip and the slit section is usually adjusted by changing the position of a detection plate that has a slit section for detecting the position of the needle tip of the pick up arm on an adjustment board attached to a mount that horizontally rotates the pick up arm. ,
After adjusting the positional relationship between the needle tip and the slit portion in this manner, it is necessary to fix the detection plate to the adjustment board. For this purpose, a detection plate adjusting device as shown in FIG. 1 has conventionally been used.

In FIG. 1, reference numeral 1 denotes an adjustment board that is attached via a support to a stand (not shown) for horizontally rotating the pick-up arm, and 2 a detection plate having a slit portion 2a at its tip for detecting the needle tip position of the pick-up arm. 3 is a shaft, and 4 is an R washer. The detection plate 2 is sandwiched between the R washer 4 and the adjustment board 1 by the shaft 3, and is rotatably fixed on the adjustment board 1 by caulking the lower end 3a of the shaft 3 to the adjustment board 1. has been done. With the above configuration, the detection plate 2 is forced onto the adjustment board 1 by the R washer 4, and rotates around the shaft 3 with a certain load on the adjustment board 1. .

In the above configuration, when a screwdriver or the like is inserted into the triangular hole 1a of the adjustment board 1 and the triangular hole 2b of the detection plate 2 and the driver or the like is rotated to adjust the position of the detection plate 2 with respect to the adjustment board 1, the R washer 4 The detection plate 2 is fixed to the adjustment board 1 due to the friction between the pressure bonding surfaces of the adjustment board 1 and the detection plate 2 due to the spring force.

However, in this case, as shown in Fig. 1, the R washer 4 is located at the center of rotation of the adjustment board 1 and the detection board 2, and it takes a considerable amount of effort to generate the frictional force necessary for fixing the adjustment board 1 and the detection board 2. Spring force is required.
In addition, since the force is applied only to the center, the load changes greatly against warping of the adjustment board 1 and the detection plate 2. For this reason, the number of unstable elements for fixing increases, and the adjusted position tends to shift.

OBJECTS OF THE INVENTION The present invention provides a pick-up position detection plate adjusting device that has a simple structure and can stably fix the plate after adjustment.

Structure of the Invention In the present invention, a detection plate having a slit portion for detecting the position of the pick-up arm needle tip provided with a protruding portion in the center is rotatably attached to the adjustment substrate by a shaft through a slit portion provided in a stepped portion of the adjustment substrate. The fixing position is adjusted by rotating the detection plate relative to the adjustment board around its axis, and the position of the detection plate relative to the adjustment board is adjusted by friction between the shaft, the slit, and the protrusion provided on the detection plate. It is designed to be easily fixed.

DESCRIPTION OF EMBODIMENTS FIGS. 2 and 3 show an embodiment of the present invention, and 5 indicates a slit portion 5a provided in a stepped portion, a triangular hole 5b for position adjustment, a shaft insertion hole 5c, and a column insertion hole. 5
d, an adjustment board 6 includes a slit portion 6a for detecting the needle tip position of the pick-up arm, a triangular hole 6b for position adjustment, a protrusion portion 6c projecting downward, and a shaft insertion hole 6.
The detection plate 7 having a diameter d is crimped to the adjustment board 5 via the detection plate 6 at the shaft. As shown in FIG. 2, the detection plate 6 is provided with a downwardly protruding protrusion 6c, and the adjustment board 5 is provided with a slit portion 5a at its step. The detection plate 6 is attached to the adjustment board 5 by a rotating shaft 7 through the slit portion 5a. Therefore, the protrusion 6c of the detection plate 6 is
It is pressed toward the adjustment board 5 between the slit portion 5a of the adjustment board 5 and the shaft 7 caulked to the adjustment board 5.

As shown in FIG. 3, the adjustment board 5 configured in this manner is attached to a pedestal 8 via a support 9 with screws 12, which rotates the pick-up arm 11 in the horizontal direction. , slit portion 6a of detection plate 6
When the pick-up arm 11 comes near the end of the record, the slit portion 6a crosses the sensor 10 and detects the end of the record. It is configured.

In this way, by rotating the detection plate 6 with respect to the adjustment board 5 about the rotation shaft 7, the positional relationship with the needle tip of the cartridge 11a attached to the tip of the pickup arm 11 can be easily adjusted. The adjustment board 5 of the detection plate 6 after adjustment can be
Fixing to the shaft 7, slit portion 5a and detection plate 6
This can be done easily and stably due to the friction of the protrusion 6c that protrudes toward the adjustment board 5.

Effects of the Invention As described above, according to the present invention, R
The detection plate can be easily fixed after adjustment without using washers, and the number of parts can be reduced compared to conventional methods.

[Brief explanation of drawings]

Figures 1a and b are an exploded perspective view and a cross-sectional view of a conventional example, Figures 2a and b are an exploded perspective view and a cross-sectional view of an embodiment of the present invention, and Figure 3 is an embodiment of the present invention. FIG. 3 is an exploded perspective view of the components attached to the pick-up arm. 5... Adjustment board, 5a... Slit part, 6... Detection plate, 6a... Slit part, 6c... Projection part, 7... Shaft,
8... Frame, 9... Support, 10... Position detection sensor,
11...Pickup arm, 11a...Cartridge.

Claims (1)

[Claims] 1. An adjustment board attached to a pedestal for horizontally rotating the pick-up arm, and a detection plate provided with a position detection slit at its tip, the detection plate comprising:
The rear end is attached to the adjustment board by a shaft, the vicinity of the tip is inserted into the slit provided in the step of the adjustment board, and the adjustment board is inserted between the shaft and the slit provided in the step. The pick-up arm has a protruding portion that protrudes toward the direction of the pick-up arm, and is configured to adjust the position of the needle tip of the pick-up arm and the detection plate by rotating the detection plate relative to the adjustment board about the axis. Arm position detection plate adjustment device.