JPS5827404Y2 - Adjustment mechanism for arm rotation position detection device in record player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adjustment mechanism for an arm rotation position detection device in a record player.

In an auto record player that automatically performs, it is necessary to adjust the relative positional relationship between the tip of the arm, the detection sensor, and the part that gives the signal to the sensor. It is necessary to maintain a suitable holding state so that it does not move due to vibration.

Therefore, in the past, as shown in FIGS.
There is one in which bases C are stacked on top of each other at the shutter edge with a washer 5 interposed therebetween to prevent rattling, and are fixed by caulking using the caulking portion 4a of the shaft 4.

This mechanism detects the rotation angle of the arm 10 by blocking the light beam of the optical sensor 7 with the shutter 3', but the mounting angle of the shutter with respect to the rotation axis 2 is adjusted by the spring 8'. The angular distance between the base holder and the shutter 3', which is always in tension, is adjusted by an adjusting screw 10 into which a spring 9 is inserted.

However, this conventional mechanism uses a washer 5 to prevent backlash between the base and the shutter, and also uses an adjustment screw 1.
Since the same spring 9 is used for 0, the number of parts increases, and the base σ is also attached by caulking, which makes assembly difficult.

The present invention focuses on the above points, and the actuating plate of the shutter etc. and the base are coaxially arranged, a leaf spring is used to press between them, and the mutual angle can be adjusted by an eccentric cam at the part of the leaf spring. Therefore, it is an object of the present invention to provide an adjustment mechanism for an arm rotation position detection device that eliminates the above-mentioned problems.

Hereinafter, one embodiment will be described with reference to FIG. and coaxially arranged with respect to the rotating shaft 2.

The base 6 has a bearing portion 6b at a position away from the shaft collar portion 6a, on which the cam shaft 11a of the eccentric cam 11 is pivotally supported.
is formed, and a hole 3a in which the camshaft 11a can freely move is formed in a portion of the shutter 30 corresponding to that position, and a cut and raised piece 3b is formed in the hole 3a.

A leaf spring 12 is compressed between the eccentric cam 11 and the shutter 3, and the leaf spring 12 has a guide hole 12a through which the camshaft 11a and the cut-and-raised piece 3b are guided.

The spring 8 applies a tensile force in the direction in which the base 6 and the shutter 3 overlap, so that the cam surface of the eccentric cam 11 pivotally supported by the base 6 is pressed against the raised piece 3b of the shutter 3.

13 is an E-shaped retaining ring to prevent the eccentric cam 12 from being removed;
Reference numeral 11b is an adjustment section that can be rotated with a flathead screwdriver.

In the above, the mounting angle of the shutter 3 with respect to the base 6 can be adjusted by rotating the eccentric cam 12.

That is, as a result, the distance between the cam shaft 11a of the eccentric cam 11 and the cut and raised piece 3b of the shutter 3 changes, so the angle between the base 6 and the shutter 3 changes.

Therefore, the mounting angle of the shutter 3 with respect to the arm 1 also changes.

At this time, the surface of the eccentric cam 11 that comes into contact with the raised piece 3b is pressed by the spring 8, and the eccentric cam 11, shutter 3, and base 6 are integrated in a pressed state by the leaf spring 12, so that their positions are fixed. Of course, there is no slippage, and there are no loose buttons.

Note that it is not always necessary to use a single leaf spring; instead, the shutter 3 is made of metal, a piece is cut and raised at an angle from both sides of the hole 3a, and this is attached to the eccentric cam 11. You can also compress it with

In other words, an inclined cut and raised piece may be used instead of the leaf spring.

Further, the eccentric cam 11 does not necessarily need to be pivoted to the base 6, and may be pivoted to the shutter 3.

In this case, the base 6 is provided with a projection on which the cam surface of the eccentric cam 11 comes into contact, and the leaf spring 12 is interposed between the base 6 and the eccentric cam 11.

Further, the shutter 3 is not limited to this, and may be a member that comes into contact with a specific member when a light beam or the like is not used.

In other words, it may be an actuating plate. As mentioned above, the present invention
A base that is fixed to the rotating shaft of the arm and rotates together with the rotating shaft, an actuating plate that is rotatably and removably attached to the base, and a load is placed between the base and the actuating plate. an elastic means provided in the state and applying a biasing force to rotate the base in one direction relative to the actuation plate; and an elastic means passing through the base and the actuation plate and pivotally supported by one of them. an eccentric cam fixed to one end of the adjustment shaft; and a contact portion provided on the other of the base or the actuating plate and elastically abutted against the cam surface of the eccentric cam when rotated by the biasing force of the elastic means. is inserted in a loaded state between the other end of the eccentric cam or the adjusting shaft and the base or the actuating plate, and the base and the actuating plate are inserted between the other end of the adjusting shaft or the eccentric cam. The apparatus includes a leaf spring that elastically clamps the actuating plate in the overlapping direction thereof, and a stop means that is detachably inserted into the other end of the adjustment shaft to prevent the eccentric cam from coming off.

Therefore, according to the present invention, the eccentric cam can be easily rotated by means such as a screwdriver, and at the same time has an appropriate amount of depression to prevent it from accidentally rotating due to vibration, etc., and the base and actuating plate are They can rotate with each other, and at the same time, mutual play is regulated to accurately maintain a certain relative position corresponding to the rotation angle of the eccentric cam, and furthermore, assembly and disassembly work during assembly, methane maintenance, etc. is facilitated. It has many effects such as:

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the conventional mechanism, Fig. 2 is a bottom view of the shutter section, Fig. 3 is an explanatory diagram of the mechanism of this embodiment, Fig. 4 is a bottom view of the shutter section, and Fig. 5 is a bottom view of the shutter section. It is a sectional view taken along the line ■-■. 1...Arm, 2...Cartwheel axis, 3...Shutter, 6
...base, 7...sensor, 8...spring,
11... Eccentric cam, 12... Leaf spring.

Claims (1)

[Scope of utility model registration request] A base that is fixed to the rotating shaft of the arm and rotates together with the rotating shaft, an actuating plate that is rotatably and removably attached to the base, and a load is placed between the base and the actuating plate. an elastic means provided in the state and applying a biasing force to rotate the base in one direction relative to the actuation plate; and an elastic means passing through the base and the actuation plate and pivotally supported by one of them. an eccentric cam fixed to one end of the adjustment shaft; and an abutment provided on the other of the base or the actuating plate, which elastically contacts the cam surface of the eccentric cam when rotated by the biasing force of the elastic means. the base and the other end of the eccentric cam or the adjusting shaft and the base or the actuating plate, the base being inserted between the other end of the eccentric cam or the adjusting shaft and the base or the actuating plate; It is characterized by comprising a leaf spring that elastically clamps the actuating plate in the direction in which they overlap, and a stop means that is detachably attached to the other end of the adjustment shaft to prevent the eccentric cam from coming off. Adjustment mechanism for arm rotation position detection device in record player.