JPH0239209Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a parallelism measuring device for a turntable in, for example, a video disc player.

[Technical background of the invention and its problems]

In order to obtain stable playback characteristics during playback on a video disc player, record player, etc., it is necessary to keep the parallelism of the turntable within a set value, and highly accurate adjustment is required during assembly. Therefore, in order to keep the travel trajectory of the top surface of the turntable and the pick-up arm on which the pick-up is mounted, that is, the height from the reference surface of the arm to the top surface of the turntable, constant until it moves from the innermost circumference to the outermost circumference of the turntable. , the rail that runs on the pick-up arm is adjusted, or the turntable's bearing housing is adjusted using the rail as a reference. However, in the past, a contact sensor was installed on the pick-up arm, and the parallelism of the turntable was measured by alternately touching the innermost and outermost peripheries of the top surface of the turntable to measure the height of each part of the turntable. I try to do that. Therefore, the task of measuring the parallelism of the turntable is extremely troublesome and requires skill.

[Purpose of invention]

This idea was created in view of the above circumstances, and its purpose is to be able to measure the innermost and outermost circumferences of a turntable at the same time without requiring any level of skill, thereby shortening the adjustment time. The present invention aims to provide a turntable height measuring device that can measure the height of a turntable.

[Summary of the idea]

A slide plate consisting of a pair of holding plates is movably provided on the rail laid on the base, and a positioning pin is provided on this slide plate for positioning the turntable by contacting the outer peripheral surface of the turntable. The parallelism of the turntable is measured by simultaneously touching two points on the innermost and outermost peripheries of the table and using the rail as a reference surface.

[Example of idea]

This invention will be explained below based on an embodiment shown in the drawings. 1 in the figure is the base, this base 1
A turntable 2 for placing a video disc or record disc is provided on the top. Rails 3, 3 are laid on the base 1 located on the side adjacent to the turntable 2, and a slide plate 4 is mounted on these rails 3, 3 so as to be freely movable. That is, this slide plate 4
consists of a first retaining plate 5 and a second retaining plate 6 which partially overlaps the upper surface of the first retaining plate 5, and this overlapping portion is connected to be vertically movable by connecting pins 7, 7. Furthermore, three support legs 8 are provided at both longitudinal ends of the first and second holding plates 5 and 6, and are supported independently at three points by the rails 3 and 3. Further, a pair of positioning pins 9, 9 projecting downward are provided at both longitudinal ends of the first holding plate 5, and these positioning pins 9, 9 abut against the outer peripheral surface of the turntable 2. The slide plate 4 is positioned using the slide plate 4. Further, sensors 11, 11 are attached to the longitudinal intermediate portions of the first holding plate 5 and the second holding plate 6 via sensor holders 10, 10, respectively. One sensor 11 faces the innermost periphery of the upper surface of the turntable 2 when the slide plate 4 is positioned at a predetermined position by the positioning pins 9, 9, and the other sensor 11
are arranged to face the outermost periphery. and,
These sensors 11, 11 measure the parallelism of the turntable 2 by using the rails 3, 3 as a reference surface 12 and detecting the height from the reference surface 12.
The measured value of No. 1 is displayed on a display section (not shown).

Therefore, when measuring the parallelism of the turntable 2, when the slide plate 4 is moved along the rails 3, 3, the positioning pins 9, 9 come into contact with the outer peripheral surface of the turntable 2. The slide plate 4 is positioned. Therefore, the sensors 11, 11 are in contact with the innermost and outermost peripheries of the upper surface of the turntable 2, and the height relative to the reference surface 12 is simultaneously detected, and the turntable is The parallelism of table 2 can be measured.

[Effect of idea]

As explained above, this idea consists of a slide plate consisting of a pair of holding plates that is movable on the rails laid on the base, supporting these holding plates at three points, and supporting the innermost and outermost peripheries of the turntable. Since the facing sensors are provided, the heights of the innermost and outermost peripheries of the turntable can be detected simultaneously, and the parallelism of the turntable with respect to the reference plane can be detected easily and with high precision. Therefore, the measurement can be performed without requiring any skill, and the parallelism adjustment work can be shortened.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a perspective view, FIG. 2 is a plan view of the main part, and FIG. 3 is a side view of the main part. 1...bass, 2...turntable, 3...
Rail, 4... Slide plate, 5, 6... Holding plate,
7...Connecting pin, 9...Positioning pin, 11...
Sensor, 12...Reference surface.

Claims (1)

[Scope of utility model registration request] A base equipped with a turntable, a pair of parallel rails laid on this base, one support leg supported on one end so as to be freely movable on the one rail, and the other end running on the other rail. It has two support legs that are freely supported, and is supported at three points in total, and is supported so that it can run freely on a first holding plate that faces the top surface of the turntable when moving forward, and also on the one rail on one end side. a second holding plate having one support leg and two support legs movably supported on the other rail at the other end, supported at three points in total, and facing the upper surface of the turntable when moving forward; a slide plate in which the first and second holding plates are vertically movably coupled by a coupling pin; and a slide plate provided on the slide plate parallel to a straight line passing through the center of rotation of the turntable; A pair of positioning pins protrude from different positions and abut against the outer peripheral surface of the turntable to position the slide plate; A device for measuring parallelism of a turntable, comprising: a sensor that contacts two points on the outer periphery and measures the parallelism of the turntable using the rail as a reference surface.