JPH0127121Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tone arm lifter device for a record player.

Conventionally, there has been a device of this type as shown in FIG. In FIG. 1, reference numeral 1 denotes a tone arm lifter, which is attached to a base plate (not shown) of a record player so as to be movable in its axial direction. This tone arm lifter 1 has a tone arm mounting portion (not shown) formed at its upper end, and when the tone arm lifter 1 is raised,
A needle (not shown) of the tone arm is separated from the record surface, and is configured such that when the needle descends, it comes into contact with the record surface. Reference numeral 2 denotes a rotating member, which is provided to be rotatable about a shaft 4 with respect to the frame 3 fixed to the substrate. This rotating member 2 is formed into a substantially L-shape, and has a substantially corner portion 2a.
serves as the center of rotation as described above, and the tone arm lifter 1 is placed on one piece 2b. Reference numeral 5 denotes a spring, which is formed into a coil shape, into which the above-described shaft 4 is inserted. One end of this spring 5 is hooked to the rotating member 2, and the other end is hooked to the frame 3, and the rotating member 2 is urged against the frame 3 in a counterclockwise direction in FIG. . Due to this bias, the rotating member 2
The tone arm lifter 1 placed on is held in an elevated state. Reference numeral 6 designates an electromagnetic plunger, which is fixed to the frame 3, and its operating rod 7 is connected to the other piece 2c of the rotating member 2, with 8 as a fulcrum. A leaf switch 9 is fixed to the frame 3 and is operated when the rotating member 2 is rotated by the spring 5. This leaf switch 9 detects that the tone arm lifter 1 is in the raised position (detects the top dead center), and based on this detection, records the tone arm only when the tone arm lifter 1 is in the raised position. It allows movement to an appropriate position along the board surface.

In the above tone arm lifter device, when the electromagnetic plunger 6 is energized, the actuating rod 7 moves to the left in FIG. 1 descends, and the tone arm needle comes into contact with the record. Next, the electromagnetic plunger 6
When the power is cut off, the rotating member 2 is rotated counterclockwise by the spring 5, the tone arm lifter 1 is raised, and the needle of the tone arm is moved away from the record surface. During the counterclockwise rotation process of the rotating member 2, the leaf switch 9 is operated, and it is detected that the tone arm needle has sufficiently separated from the record surface, and the tone arm is thereby moved to an appropriate position. obtain.

In the conventional tone arm lifter device explained with reference to FIG. are doing. However, by using this leaf switch 9, the operating points vary widely from part to part, and therefore the operating positions vary widely, resulting in poor detection accuracy. For this reason, the leaf switch 9 was turned on and the tone arm began to move before the needle had sufficiently separated from the surface of the record, resulting in a malfunction that could damage the record. In order to avoid such malfunctions, conventionally the leaf switch 9 must be operated only when the needle moves further away from the record surface than necessary in order to delay the timing of the switch operation.

In this way, if the needle moves further away from the record surface than necessary, the time from when the electromagnetic plunger 6 is de-energized until the tone arm is moved along the record surface becomes longer, resulting in full automatic operation. This has the disadvantage of slow operation time as a player. Further, the rotation range of the rotation member 2 by the electromagnetic plunger 6 and the rotation range of the rotation member 2 by the spring 5 are extremely narrow, so that the needle does not move away from the record surface more than necessary, as described above. The leaf switch cannot be configured to operate when the leaf switch is further away than necessary. For this reason, when using a conventional leaf switch, after operating the switch,
The tone arm is configured to be able to be moved along the surface of the record after a suitably set delay time has elapsed. Therefore, the movement of the tone arm is delayed by this delay time, resulting in a disadvantage that the operation time of the fully automatic player is slow.

This idea was made to compensate for the shortcomings of the conventional ones as mentioned above, and it is a device that compensates for variations in operating position by using a micro switch instead of a leaf switch and providing an adjustment screw to compensate for variations in operating position. is intended to provide.

An example of this invention is shown below in Figures 2 and 3.
The diagram will be explained. In the figure, reference numeral 1 is the tone arm lifter explained in the conventional example,
It is attached to a board of a record player (not shown) so as to be movable in its axial direction.
Reference numeral 2' denotes a rotating member, which is formed in a square shape by one piece, a middle part, and the other piece, and rotates around the shaft 4 attached to the middle part, and rotates around the frame 3 described in the conventional example. It is rotatably mounted on the As described above, this frame 3 is fixed to a substrate (not shown), and an electromagnetic plunger 6 and a micro switch 9' are also fixed to this frame 3. The tone arm lifter 1 is placed on one of the above-mentioned pieces of the rotating member. Reference numeral 5' denotes a tension spring, which is tensioned between the frame 3 and the other part of the rotating member 2', thereby causing the rotating member 2' to move as shown in FIG. It is biased counterclockwise around the shaft 4. The electromagnetic plunger 6 is mounted below the shaft 4 in the middle part of the rotating member 2' in FIG. 3 with its operating rod 8 as a fulcrum. The moving member 2' is rotated clockwise in FIG. 2 against the spring 5'. By this clockwise rotation, the tone arm lifter 1 described above is lowered. Reference numeral 10 denotes an adjustment screw, which is screwed into the other part of the rotating member 2', the tip of which is opposed to the unillustrated operator of the micro switch 9', When ' is rotated counterclockwise in FIG. 2 by the spring 5', the micro switch 9' is operated by the adjusting screw 10. By adjusting this operating position by turning the adjusting screw 10, the micro switch 9' can be operated by the adjusting screw 10 when the tone arm lifter 1 rises and reaches the top dead center.

In the tone arm lifter device configured as described above, by energizing the electromagnetic plunger 6,
The rotating member 2' is rotated clockwise in FIG. 2 against the spring 5', and as a result of this rotation, the tone arm lifter 1 is lowered and the needle of the tone arm comes into contact with the top of the record. Next, when the power supply to the electromagnetic plunger 6 is cut off, the rotating member 2' is rotated counterclockwise by the spring 5'.
The tone arm lifter 1 rises and the tone arm needle leaves the record. This rotating member 2'
During the counterclockwise rotation process, the micro switch 9' is operated by the adjustment screw 10, and it is detected that the tone arm needle has left the record sufficiently (top dead center). It can be moved to an appropriate position.

As mentioned above, in this device, normally the tone arm lifter 1 is raised by the force of the tension spring 5', and upon receiving a lowering command signal, the tone arm lifter 1 is raised by the force of the electromagnetic plunger 6. The device for lowering the arm lifter includes a micro switch 9' fixed to the frame 3 to which the electromagnetic plunger 6 is fixed, and an adjustment screw 10 attached to the tone arm lifter 1 so as to be adjustable. The micro switch 9' is operated by pressing the operator with the screw, and the adjustment screw 10 is moved in conjunction with the movement of the tone arm lifter 1 to set the top dead center of the tone arm lifter. Detection is made when the micro switch 9' is operated, and the timing at which the micro switch is operated can be adjusted using the adjustment screw, so the top dead center of the tone arm lifter 1 is detected. It is possible to compensate for variations in position.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is a perspective view of an embodiment of the present invention, and FIG. 3 is an enlarged view of the main part of FIG. 3: Frame, 4: Axis, 5': Tension spring, 9': Micro switch, 10: Adjustment screw.

Claims (1)

[Scope of utility model registration request] Normally, the tone arm lifter is in a raised state due to the force of a spring, and when receiving a lowering command signal, the tone arm lifter is lowered by the force of the plunger. The micro switch is fixed, and the adjustment screw is adjustable with respect to the tone arm lifter, and the adjustment screw presses the micro switch to operate the tone arm lifter. is detected when the micro switch is operated by the movement of the adjustment screw that is moved in conjunction with the movement of the tone arm lifter, and the timing at which the micro switch is operated by the adjustment screw is detected. A tone arm lifter device for a record player, which is adjustable.