JPS62282838A - Clamp mechanism for hollow disc - Google Patents

Abstract

PURPOSE:To clamp a disc with a center hole without using man power, by using a form memory alloyed actuator. CONSTITUTION:A hollow disc 1 is supported by a table 2, while a truncated conical center hole presser 4, consisting of an elastic body, is tightly attached to a center shaft 3, clamping the disc 1, and a form memory alloyed actuator 5 is connected to the center hole presser 4. When heat is added to the actuator 5 and it is restored to its original form, the center hole presser 4 becomes smaller than a center bore of the disc 1 by the actuator 5 so that setting and removal of the disc 1 are possible to be done. When the actuator 5 comes to less than the restoring temperature, it is restored to its original state again by dint of elastic force of the center hole presser 4. Thus, the center hole presser 4 is formed into a truncated conical form whereby clamping can be made yet stronger.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a clamping mechanism for a perforated disk.

[Conventional technology]

Conventionally, as shown in FIG. 3, a clamp mechanism using a screw has been known.

[Problem that the invention seeks to solve]

However, since the conventional clamp mechanism has a moving part,
The sliding part may wear out and fall off, contaminating the disk surface, and furthermore, there is a problem in that dust falls off from fingers etc. when attaching and removing screws and contaminates the disk surface. .

Therefore, in order to solve these conventional problems, it is an object of the present invention to provide a clamping mechanism that does not have a sliding part and can perform clamping without requiring human power.

[Means for solving problems]

A clamping mechanism for a perforated disc according to the present invention is a clamping mechanism for clamping a disc having a center hole at the center hole, comprising: a table for supporting the disc; [C1 fixed to the table; A central shaft having a diameter slightly smaller than the diameter of the central hole of the disc, (dl) A central shaft made of an elastic body attached to the central shaft and having a diameter larger than the diameter of the central hole of the disc, +111 The present invention is characterized in that it includes an actuator made of a shape memory alloy that acts so that the center hole becomes smaller than the diameter of the center hole of the disk when the center hole is joined to the center hole and its shape is recovered.

[Effect]

When the shape memory alloy actuator of the clamp mechanism configured as above is heated to recover its shape, the center diameter becomes smaller than the center hole diameter of the disk, so it is necessary to set the disk on the table. When the temperature of the zero-order shape memory alloy actuator is lowered below the shape recovery temperature, the elastic modulus of the shape memory alloy becomes smaller, so the central groove expands and clamps the center hole of the disc.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. In FIG. 1(a), a circle g111 is supported by a table 2, and a truncated cone-shaped center holder 4 made of an elastic body is fixed to the central shaft 3, and clamps the disk l. An actuator 5 made of a shape memory alloy is joined to the central Okami 4. FIG. 1 Tbl shows a state in which the actuator 5 shown in FIG. 1 ial has been restored to its shape by applying heat. Indicates a state where it can be installed and removed. When the actuator 5 becomes lower than the shape recovery temperature, the elastic force of the central Okami 4 reverts to the shape shown in Figure 1 fa.
The state becomes t. By making the center holder 4 into a truncated conical shape in this way, it is possible to generate a force acting in the direction of the table during clamping, thereby making the clamp stronger.

FIG. 2 shows another embodiment in which the central Okami holder 4 and the actuator 5 are joined. FIG. 2(a) shows the state before the shape recovery of the actuator 5, and FIG. This is the state after shape recovery, that is, Fig. 2(b)
The shape shown in 1 is stored in the actuator 5, and the shape shown in FIG.
). When the actuator 5 has such a shape, the amount of shape memory material used may be small and processing becomes easy.

〔Effect of the invention〕

As explained above, the present invention has the effect of preventing contamination of the disk surface by providing a clamping mechanism that does not have a sliding part and does not require human power.

[Brief explanation of drawings]

FIG. 1 shows the perforated disk clamping mechanism of the present invention.
Cross-sectional perspective view showing the state before shape recovery of the actuator +
a+ and a cross-sectional perspective view (b) showing the state after shape recovery of the actuator. FIG. 2 is a perspective view [al] showing the state of the actuator before shape recovery in an example of joining the actuator and the center ogami cage according to the present invention, and a perspective view (b) showing the state of the actuator after shape recovery. FIG. 3 is a longitudinal sectional view showing a conventional clamp mechanism. 1...Perforated disc 2...Table 3...Central axis 4...Central Okami 5...Actuator and above Applicant: Seiko Epson Corporation Figure 2 (a) (b)

Claims (1)

[Claims] (1) (a) A clamping mechanism that clamps a disk having a center hole at the center hole, (b) a table that supports the disk, (c) fixed to the table and having a diameter of the center hole of the disk. (d) a center hole holder made of an elastic body attached to the center shaft and having a diameter larger than the center hole diameter of the disc; (e) a center hole holder having a diameter slightly smaller than the center hole diameter of the disk; A clamping mechanism for a perforated disc, characterized in that it is equipped with a shape memory alloy actuator that acts so that the center hole presser becomes smaller than the center hole diameter of the disk when the center hole presser is joined to the presser foot and has recovered its shape. .