JPH0127052Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dust-proof shutter for components that are extremely susceptible to dust in laser application equipment and the like.

A conventional dustproof shutter structure of this type is shown in FIG. Figure A is a sectional view of the dustproof shutter structure, and Figure B is a side view of the dustproof shutter structure. A shutter 3 is provided in a case 1 via an O-ring 2 (airtight structure). A shaft 4 for vertical movement is connected to the shutter 3, guide rails 5 are attached to both sides of the shutter 3, and a crosshair plate (reticle plate) for optical alignment is attached to the shutter 3.
Or a blind board etc. is fixed.

In this dustproof shutter configuration, the shaft 4 for vertically moving the shutter 3 presses the O-ring 2 with a constant pressure when the shutter 3 is moved up and down, so the side surface of the shutter 3 is constantly in contact with the O-ring 2, causing the O-ring 2 to wear out. This has the disadvantage that it tends to generate dust.

The purpose of the present invention is to provide a dust-proof shutter that has a structure that contacts an O-ring only when the shutter is required to move up and down, and prevents the generation of dust as much as possible.

Therefore, in the present invention, the case is equipped with a support plate connected to the shutter having an airtight structure through an O-ring by a link mechanism, and when the vertically movable shaft connected to the support plate is pulled upward, the shutter is The link mechanism slides horizontally using a spring, and when the vertically movable shaft is lowered, the bearing hits the seat surface and slides horizontally using the link mechanism, releasing the O-ring. By pressing, the C-ring has a structure that reduces the contact area and prevents dust from coming out.

Next, embodiments of the present invention will be described with reference to the drawings.

Figure 2 A is a cross-sectional view of the dustproof shutter structure, Figure 2 B
is a side view of the dustproof shutter structure.

A case 1 has a shutter 3 via an O-ring 2, and is connected to a support plate 11 by a link mechanism 10. A vertically movable shaft 4 is connected to the support plate 11, and when the vertically movable shaft 4 is pulled up, the shutter 3 is slid downward and fixed by a coil spring 12 via a link mechanism 10. Further, when the vertically movable shaft 4 is lowered, the bearing 13 attached to the lower part of the shutter 3 hits the bottom surface, slides laterally, and presses the O-ring 2. Guide rails 5 are attached to both sides of the shutter 3, and a crosshair plate (reticle plate) or a blind plate 6 is fixed to the shutter 3.

According to this invention, the shutter can be opened and closed without contacting the O-ring when the shutter moves up and down, which prevents dust that is likely to be generated due to contact with the O-ring, and also allows the shutter to open and close smoothly. be.

[Brief explanation of the drawing]

1A and 1B are a sectional view and a side view showing a conventional dustproof shutter structure, and FIGS. 2A and 2B are a sectional view and a side view showing an embodiment of the present invention. 1... Case, 2... O-ring, 3... Shutter, 4... Vertical movable shaft, 5... Guide rail, 6... Crosshair plate (reticle plate) or blind plate, 1
0... Link mechanism, 11... Support plate, 12... Coil spring, 13... Bearing.

Claims (1)

[Scope of utility model registration request] O is installed in the case by partitioning the inside of the case and having a shutter that can be moved up and down, the shutter sliding in the horizontal direction when the shutter is pulled up, and the shutter sliding in the opposite direction to the horizontal direction when the shutter is pulled down. A dustproof shutter characterized by having a link mechanism that presses against a ring.