JPS6319989Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a horizontal holding adjustment device for keeping the turntable of a record player placed on a stand in a horizontal position. To provide a record player which can be freely adjusted in the vertical direction in a free space above and which is suitable for obtaining balanced sound quality without causing howling due to electromechanical vibration.

Conventionally, in order to hold the turntable of a record player horizontally, there is a simple structure in which a screw installed on the pedestal of the base is adjusted, and a structure in which the support shaft of the base is lifted by the elastic force of a spring is known. However, in both cases, it is necessary to turn screws in at least multiple places to reach a horizontal position in the narrow space between the mounting table and the base, and it is difficult to achieve levelness even though it is time-consuming. Due to the structure in which the turntable is directly supported on a base that propagates mechanical vibrations caused by electrical vibrations, howling occurs, records have poor tracing, and are unstable and susceptible to external vibrations. Ta.

The present invention focuses on the above-mentioned obstacles and difficulties, and changes the relative relationship between the shaft center and the piston, which adjusts the movable plate with the support arm facing the base up and down from above, to improve the vibration absorbing structure of the bearing structure. The damping effect allows the turntable to be held horizontally while being completely isolated from vibrations. An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an external perspective view of the main part of a record player in which the present invention is implemented, and FIG. FIG. 2 is a side view taken along line A-A' of a supporting arm as a movable plate 2 that can be adjusted.

In FIG. 2, 30 is a piston 5 that slides in a cylinder 33 that is fitted and fixed to the fixed plate 1, and a threaded shaft center 32 that is integrated with an adjustment knob 31 that changes the distance D between the movable plate and the fixed plate is inserted into the piston 5. A load receiving coil spring 6 is inserted between the lower end of the piston and the inner bottom surface of a receiving cap 4 fitted into the cylinder. 7 is a fastening screw that fixes the knob and the movable plate; 8 is a locking screw that prevents rotation of the cylinder that is fitted and fixed to the fixed plate;
A narrow groove in the axial direction is bored in the cylinder.

With the above configuration, when the knob is rotated around the axis as indicated by the arrow, the distance between the movable plate and the fixed plate expands and contracts in accordance with the advance and retreat of the threaded portion of the axis.

Here, the piston slides up and down on the inner wall of the cylinder, but as the shaft moves forward, it is pressed downward against the elastic force of the coil spring, and the shaft is kept in a suspended state. Also, the thickness of the movable plate is slightly thinner than that of the fixed plate,
Both the fixed plate and the movable plate are preferably made of a metal material such as aluminum, and the bearing structure is preferably made of brass. 9 is an elastic material for absorbing spring noise.

Thus, according to the present invention, the bearing structure is such that the movable plate serving as the supporting arm is separated from the base and exposed to the upper space, and the axis is supported by the piston and the coil spring to maintain the movable plate in a suspended state. Because they are connected to form a two-tier structure, vibrations from the base are blocked, and they are fixed and
Since the movable plate is made of a thick rigid body, it does not cause resonance due to external vibrations, preventing howling and deterioration of the S/N ratio, and the adjustment knob can be rotated in the free space above. Since it can be operated, the horizontality of the turntable can be precisely and easily adjusted and held stably.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the main part of a record player implementing the present invention, and Fig. 2 is an A--A in Fig. 1.
_A1 is a cut side view. 1: Fixed plate, 2: Movable plate, 30: Bearing structure, 3
1: Adjustment knob, 32: Threaded shaft center, 33: Cylinder, 4: Receiving cap, 5: Piston, 6: Coil spring, 9: Elastic material for absorbing sound, D: Spacing.

Claims (1)

[Scope of utility model registration request] In a record player that adjusts the horizontality of the turntable at multiple points on the base,
A high-mass thick fixed plate serving as a base, a high-mass thick movable plate serving as a plurality of support arms on which the turntable is rotatably placed and facing parallel to the fixed plate, and the fixed plate. a piston that is fixed in the thickness direction of the cylinder and whose cylinder slides on its inner wall; a threaded shaft that is rotatably fixed to the movable plate and screws into the piston; and a piston that expands and contracts in response to the movement of the piston. A leveling adjustment device for a record player, comprising a bearing structure made of a coil spring whose force changes, and capable of reducing mechanical vibration and adjusting levelness while keeping the piston in a suspended state.