JPS5829472Y2 - Vacuum baking frame upper frame closing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for closing the upper frame of a vacuum printing frame used in photoengraving, etc., and in particular allows the opening of the upper frame to be performed with one-touch operation with one hand. The present invention relates to an upper frame closing device configured to ensure the airtight closing function required for.

As is well known, in the case of a vacuum baking frame, an airtight sheet with an airtight backing formed around the periphery is stretched over the upper surface of the lower machine frame, and an upper frame fitted with a translucent plate is hinged at the rear edge of the lower frame. When the upper and lower frames are closed, the airtight chamber formed by the upper and lower frames is evacuated, and the airtight sheet is brought into close contact with the translucent frame under atmospheric pressure. Contact printing is carried out by stacking the sheets in close contact with each other and irradiating them with an appropriate light source through a light-transmitting plate.

In such a vacuum baking frame, during evacuation, it is necessary that the airtight backing formed on the lower frame and the upper frame are sufficiently crimped to maintain airtightness. As a result, the adhesion between the photosensitive material and the original plate becomes poor, resulting in so-called "burning blur".

For this reason, a spring-loaded hinge is generally used at the rear edge hinge of the vacuum firing frame, and a spring-loaded hook is also installed at the front edge, so that the upper and lower frames are crimped using the elasticity of the spring. .

In this case, the hooks on the front edge are usually installed in multiple numbers except for small-sized baking frames, and when opening and closing the top, these hooks are individually locked or separated, so the same operation is performed on the hooks. It was necessary to repeat according to the number of pieces.

In addition, vacuum baking frames equipped with an interlocking mechanism that simultaneously activates multiple hooks with a single operation are in practical use, but the interlocking mechanism requires long members, complicates the structure, and increases costs. There is.

The present invention allows the upper frame to be closed and opened with one touch by simply operating a set of hooks installed at the front edge of the vacuum baking frame, and the upper and lower frames are securely crimped when closed. The purpose of the present invention is to provide a top-up closure device that provides the following.

The present invention will be explained below with reference to the drawings.

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of a vacuum baking frame equipped with a closing device of the embodiment, FIG. 2 is a cross-sectional view of the handle attachment part, and FIG. 3 is a view of the hook part. FIG.

Referring to FIG. 1, the lower frame 1 is a box-shaped frame that houses a vacuum pump, a motor, etc., and has a rubber airtight sheet 9 (see FIG. 2) stretched over its upper surface.

The upper frame 2 is a frame-shaped frame that is hinged to the lower frame 1 at the rear edge with a well-known spring-loaded hinge, and each side is composed of a square tubular member, and a transparent glass plate 3 is attached to the lower surface of the frame. .

A pair of leaf springs 5, 5 are installed at the front end of both side edges of the upper frame 2,
A handle 4 is installed on this.

A closing hook device 6 is installed in the center of the handle 4.

FIG. 2 is a sectional view of the side edge of the first illustrated device, showing the airtight sheet 9 stretched over the upper surface of the lower frame 1 and the airtight backing 10 formed upright on the airtight sheet 9. 07 is 1 of the upper frame 2. This figure shows a cross section of the side edge member. A hole 8 is bored in the front end of the member 7, and a leaf spring 11 (same as 5 shown in the first figure) is inserted into the member 7 through the hole 8. It is installed with 2.12.

The free ends of the leaf spring 11 are attached to both ends of the handle 4.

FIG. 3 is a cross-sectional view of the hook portion of the first illustrated device, and 12 shows a cross-section of the front edge member of the upper frame 2.

13 is a latch attached to the center of the front surface of the lower frame 1.

Two shafts 15 and 1 are attached to the bearing 14 in the center of the handle 4.
A hook 16 is pivotally mounted on the shaft 15, and a lever 20 is pivotally mounted on the shaft 19.

The lower end of the hook 16 is formed with a pawl that engages with the latch 13 when the upper frame 2 is closed, is urged toward the latch 13 by a spring 1T, and is formed into a shape 14.

A lever 21 pivotally mounted on the shaft 20 is formed with a protrusion 22 that abuts and engages with the protrusion 19 of the hook 16.
1 has a finger rest 23 extending upward from the handle 4.

When the illustrated vacuum baking frame is pressed to close the upper frame 2, the handle 4 is grasped and pushed down, and the hook 6 is automatically engaged with the latch 13 to close the upper and lower frames.

At this time, by setting the dimensional relationship of each member so that the glass plate 3 attached to the lower surface of the upper frame 2 contacts the upper edge of the rubber backing 10 and compresses it to some extent, the glass plate 3 and the airtight sheet 9 An airtight chamber is formed between the two.

In this case, the upper frame 2 is cut upward by the compressed rubber backing 10, but since the handle 4 is locked to the lower frame at its center by the third illustrated device,
The leaf springs 11 at both ends are closed with some distortion as shown by the chain lines in FIG.

Therefore, the upper frame 2 is crimped to the lower frame 1 with buttons at both ends of its front edge, and a nearly uniform crimping force is obtained over the entire width.
Sufficient adhesion can be obtained all around.

To open the upper frame 2, use one hand to grasp the area near the hook device of the handle 4 and press down on the finger hook 23 of the lever 21 with a piece of resin.
presses the protrusion 19 of the hook 16, rotates the hook 16 against the spring 11, releases it from the latch 13, and releases the upper frame 2 from the closed state.

Although the present invention has been described above based on the embodiments shown in FIGS. 1 to 3, the present invention is not limited to the above-mentioned contents.
Various modifications and applications are possible.

In addition, the above explanation describes an example in which the present invention is implemented in a vacuum baking frame of the type that has a rubber sheet on the lower frame side and a glass plate on the upper frame side, but this is the opposite type, that is, the lower frame side It is also possible to use a vacuum baking frame of a type other than a hinge type, for example, a type in which the upper frame is suspended upward while keeping the upper frame horizontal.

As described above, the upper frame device of the present invention can reliably close and open the upper and lower frames with one-touch operation using only one hand when opening and closing the vacuum baking frame used in photolithography.
Moreover, with a pair of hook devices installed at the center of the front edge, it is possible to obtain a substantially uniform crimped state over the entire width.

Moreover, the crimping force is achieved by the leaf springs fixed to both ends of the upper part, so the structure is extremely simple, and there are no moving parts in this part other than the bending of the leaf springs, which is extremely favorable from the viewpoint of maintenance. It is something.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a vacuum baking frame embodying the present invention, Fig. 2 is a sectional view of both ends of the upper end of the vacuum baking frame, Fig. 3 is a sectional view of the hook device, and Fig. 4 is another hook. FIG. 2 is a cross-sectional view of an example of the device. 1... Lower frame, 2... Upper frame, 3... Glass plate, 4
...-. Endle, 5.. Leaf spring, 6.. Hook device, 7.. Upper frame side edge member, 8.. Hole, 9.. Rubber sheet, 10.. Rubber backing. , 11... Leaf spring, 12... Bolt, 13... Latch, 14... Bearing, 15... Shaft, 16... Hook, 17... Spring, 18... Hit, 19...Shaft, 21...Lever, 24...Bearing, 28...Spring. 25...shaft, 26...hook,

Claims (2)

[Scope of utility model registration request] (1) A button is attached to a vacuum firing frame equipped with a light-transmitting plate on one side of the upper and lower row frames and a soft sheet for vacuum sealing on the other side, and protrudes in the longitudinal direction of the member from both side edge members of the upper frame, and a pair of leaf springs that are attached so as to be elastically deformable so that the protrusion curves at least downward; a handle in which the pair of leaf springs are connected and installed; and a handle in which the leaf spring is deformed downward in the center of the handle. An upper frame closing device for a vacuum baking frame, which serves as a hook device that is attached so as to engage with the lower frame in the closed state. (2) Regarding the above-mentioned release mechanism of the closing device, a device that engages a hook and a lever extending from the top of the handle in order to pull the hook toward you, and releases the hook by pushing the lever downward.