JP2536107Y2 - Dynamic balance testing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a dynamic balance tester used for a dynamic balance test of a thin-walled disk-shaped work such as an optical disk.

[Prior art] For example, when performing a dynamic balance test of a thin disk such as an optical disk or a laser disk, the thin disk cannot be attached to the rotating spindle of the testing machine as it is, so an adapter for the thin disk is attached to the spindle, A thin disk to be tested is attached to the adapter.

Conventional thin-walled disk adapters are configured to position the thin-walled disk by fitting a core hole of the thin-walled disk into a tapered cone for positioning, and fix the thin-walled disk with a holding plate that is screwed at a plurality of locations. .

[Problem to be Solved by the Invention] In the above-mentioned conventional adapter, it is necessary to adjust the tightening amounts of a plurality of screws for fixing the holding plate to expose the thin circular plate, so that setting requires skill and There was a problem that workability was poor. Further, since the thrust bearing is provided to convert the operation of the holding plate from the rotational motion to the linear motion, there is also a problem that the runout of the core portion adversely affects the measurement result.

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration.

That is, the adapter according to the present invention is a dynamic balance tester provided with an adapter for attaching a disk-shaped work having a center hole to a rotating shaft at a central portion, wherein the adapter is:
A lower adapter attached to the main shaft of the tester main body, and an upper adapter mounted so as to be movable only in the axial direction of the main shaft with respect to the lower adapter. A tapered cone formed upwardly by a spring, biased upward by a spring, a work receiving plate provided on an outer peripheral portion of the tapered cone, and a magnet provided facing an upper surface of the work receiving plate. The adapter is provided with a magnet that is attracted by the magnet of the lower adapter, moves the upper adapter to the lower adapter, and clamps the work fitted to the tapered cone between the work receiving plate and the lower adapter. The locking pin provided on the adapter side is inserted, and a pin hole for preventing rotation around the main shaft is provided.

[Operation] The disk-shaped work fitted to the tapered cone of the positioning member is pressed against the tapered cone by the magnetic force of the magnet and fixed to the work receiving plate, so that the work can be easily attached and detached. Further, since the locking pin provided on the lower adapter side is inserted into the pin hole provided on the upper adapter, the positioning of the upper adapter with respect to the lower adapter is accurately performed, and the displacement is prevented.

[Embodiment] Fig. 1 shows an embodiment of an adapter used when a non-magnetic thin disk is attached to a main shaft of a testing machine. This adapter 1 is a lower adapter 2 that can be split from each other.
The upper adapter 3 is fixedly attached to the main shaft with the tip of a vertical main shaft 6 of the tester inserted into a main shaft hole 5 provided at the lower end of the lower adapter 2.

The lower adapter 2 is provided with a guide shaft 12 having the same axis as the main shaft 6 from the center of the bottom of the concave portion 11 formed in the main body 10, and a positioning member 14 is fitted around the guide shaft. The upper portion of the positioning member 14 is a tapered cone 15 having a tapered outer peripheral portion, and this portion protrudes above the concave portion 11. Positioning member 14
Is slidable along the guide shaft 12 within a range from the bottom of the concave portion 11 to the spacer 16 fixed to the lower surface of the flange portion 12b of the guide shaft 12, and is urged upward by a spring 18 built in the inner peripheral portion. Have been. A work receiving plate 20, in which an appropriate number (for example, three) of magnets 19,... Are arranged on the upper surface side at equal intervals along the circumferential direction, is fitted on the upper outer peripheral portion of the main body 10. ing. The upper surface of the work receiving plate 20 is formed in a stepped shape with a slightly higher inside, and is formed as a horizontal plane orthogonal to the guide shaft 12.

The upper adapter 3 is provided with a main body 25 attached to the upper portion 12a of the guide shaft and a lower peripheral portion of the main body, and magnets 26,... Corresponding to the magnets 19,. And a flange 27. This flange 27
In correspondence with the work receiving plate 20, the lower surface is formed in a stepped shape in which the inner peripheral side is positioned slightly lower, and is formed as a horizontal plane orthogonal to the guide shaft 12. Since a bearing metal 30 is stuck on the inner peripheral surface of the guide hole 29 in which the guide shaft upper part 12a is fitted, and the detent pin 32 protruding upward from the flange part 12b is inserted into the pin hole 33, The entire upper adapter 3 is slidable along the axis XX and is not rotatable around the axis. Between the inside and outside of the guide hole 29, communication holes 34,. The upper and lower magnets 19 and 26 corresponding to each other have the opposite magnetic poles. For example, if the magnetic pole of the magnet 19 is (N), the magnetic pole of the magnet 26 is provided as (S). And the flange 27 are attracted to each other. The work receiving plate 20 and the flange 27 are preferably made of a non-magnetic material, for example, a synthetic resin.

A method of mounting an optical disk, which is a non-magnetic thin disk, as a work will be described. First, with the upper adapter 3 removed, the core hole 41 of the work 40 is fitted to the taper cone 15 of the positioning member 14. Set it to In this state, since the positioning member 14 is lifted by the action of the spring 18, there is a slight gap between the work 40 fitted to the positioning member 14 and the work receiving plate 20.
Next, the upper adapter 3 is attached to the lower adapter 2 by inserting the guide hole 29 into the guide shaft upper part 12a and inserting the pin hole 33 into the locking pin 32. When the upper adapter 3 approaches the lower adapter 2 to some extent, the magnets 19,.
, The upper adapter 3 is drawn to the lower adapter 2 side. Accordingly, the positioning member 14 holding the work 40 is pushed down against the force of the spring 18, and the work 40 is held in a plane orthogonal to the axis while being held by the work receiving plate 20 and the flange 27. You.

When removing the work 40, the upper adapter 3 may be pulled upward to remove the work 40 from the tapered cone 15. Its attachment and detachment are very simple.

[Effects of the Invention] As is clear from the above description, in the dynamic balance tester according to the present invention, the work mounting adapter fixes the work by using the magnetic force of the upper and lower magnets arranged with the work interposed therebetween. Therefore, fixing work such as screws is not required, the workability is good, and the thrust bearing is not used, so that the runout of the tapered cone can be suppressed to a minimum.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an adapter of a dynamic balance testing machine according to the present invention. 1 ... Adapter, 2 ... Lower adapter, 3 ... Upper adapter, 6 ... Spindle, 12 ... Guide shaft, 14 ... Positioning member, 15 ... Taper cone, 19,26 ... Magnet, 20 ... Work Receiving plate, 27 …… Flange, 40 …… Work.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-3760 (JP, A) JP-A 62-135937 (JP, U) JP-A 1-146337 (JP, U) JP-A 61-135 158641 (JP, U) JP-B 60-35747 (JP, B2) JP-B 51-23166 (JP, B2) Jiko 62-34009 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A dynamic balance tester provided with an adapter for mounting a disk-shaped work having a center hole in a central portion to a rotary shaft, wherein the adapter is a lower adapter mounted on a main shaft of a tester main body. And an upper adapter attached to the lower adapter so as to be movable only in the axial direction of the main shaft,
The lower adapter has a tapered surface which fits into a core hole of a work formed on an outer peripheral portion, and a tapered cone urged upward by a spring, a work receiving plate provided on an outer peripheral portion of the tapered cone, and a work receiving plate. A magnet provided facing the upper surface of the plate, and the upper adapter includes:
A magnet is attracted by the magnet on the lower adapter side to move the upper adapter to the lower adapter side, and a magnet for holding the work fitted to the tapered cone between the work receiving plate and the lower adapter side is provided. A dynamic balance tester characterized by having a locking pin inserted therein and a pin hole for preventing rotation about a main shaft.