JPH0142106Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen mounting frame, and more particularly to a screen mounting frame that allows a desired number of screens to be mounted and allows some or all of these screens to be easily replaced.

When creating a gravure printing plate, a method of printing a gravure screen onto a carbon tissue is used to form a so-called dote for supporting a doctor blade and holding printing ink on the gravure printing plate. is commonly practiced.

Conventionally, when printing a gravure screen on a carbon tissue, it was common to print it in a large size, such as a full B version or an A double version.
In conventional gravure processes, one type of gravure contact screen with a 45° angle was commonly used for each color plate. Alternatively, gravure contact screens with different angles may be used for each color plate, but in that case,
The large size was maintained, that is, one cylinder was replaced entirely.

Therefore, in such a conventional baking method,
Once a gravure screen is attached to a contact screen mounting frame, it is rarely removed from this mounting frame, so it is firmly attached with adhesive or tape.

By the way, as a gravure plate making method, a method is known in which a gravure screen is baked on a carbon tissue, and a lithographic or letterpress net positive is further baked to form an corrosion resist to obtain a plate for gravure printing.

It is also known that in this case, it is necessary to adjust the screen angle of the net positive and the screen angle of the gravure screen so that moire is minimized. Therefore, when a new mesh positive for use in such a gravure plate making method is created, problems are unlikely to occur because it is created at a standard angle that minimizes moiré. However, there may be cases where it is necessary to use net positives made by other companies or other net positives with a mixture of screen angles. In such a case, it becomes necessary to change the angle of the gravure screen for each page where each net positive exists and print it onto the carbon tissue. Conventionally, for this purpose, a cut-and-paste screen was positioned on a transparent base made of polyester or the like, and then attached to a screen mounting frame with tape. This method has drawbacks such as it takes time to replace the screen and the tape glue may adhere to the carbon tissue.

The present invention eliminates these drawbacks and provides a screen mounting frame that allows the screen to be easily replaced for each desired page.

The present invention will be explained in more detail below.

FIG. 1 is an explanatory diagram of one embodiment of the screen mounting frame of the present invention. In FIG. 1, a transparent plate 2 such as a glass plate is attached to an outer frame 1. The outer frame 1 is preferably made of metal such as aluminum. A deaeration groove 3 is provided on the screen mounting surface side of the outer frame 1. The deaeration groove 3 surrounds the outer frame 1. This degassing groove 3 is covered with a cover plate 4 made of stainless steel plate or the like, and the cover plate 4 is provided with a degassing opening 5. Outer frame 1
and the cover plate 4 are the tape 6 at the outer peripheral edge of the outer frame 1.
It is sealed to prevent air from leaking. On the other hand, the inside of the outer frame 1 and the deaeration groove 3 are communicated through a connecting groove 3'. Alternatively, instead of or in addition to the connecting groove 3', thick material such as tape is applied partially to the back surface of the cover plate 4 to connect the deaeration groove 3 and the inside of the outer frame 1. You may let them. Therefore, by removing air from the deaeration opening 5 with a vacuum pump, the air within the screen mounting frame is removed.

A means for attaching a screen is provided near the inner peripheral edge of the outer frame 1. In the case of FIG. 1, the magnetic body 7 is embedded in the outer frame 1. The magnetic body 7 may be a magnet or may be non-magnetized iron or the like. A desired number of screens can be attached to such a screen attachment frame. 1st
In the case of the figure, four screens a, b, c, and d are attached. The screen is supported on top of this screen by a magnetic holding plate 8. When the magnetic body 7 is a magnet, the holding plate 8 may be a magnet or a magnetic body such as unmagnetized iron. If the magnetic body 7 is not a magnet, a magnet is used as the holding plate 8.

The magnetic body 7 may be provided continuously as shown in FIG. 1, or may be provided intermittently.

FIG. 2 shows a sectional view taken along line A--A in FIG. As a means for attaching the screen, in addition to using a magnetic material as shown in FIG. 1, pins may be used. A suitable number of pins are provided near the inner peripheral edge of the outer frame 1, and holes are provided at the ends of the screen to match the pins.
A screen can be attached by passing a pin through this hole.

As described above, according to the screen mounting frame of the present invention, the screen can be replaced extremely easily. Furthermore, even if it is necessary to use screens with different screen angles for each page or several pages, by preparing a screen the size of one page, it is possible to easily replace only the pages that require replacement. can.

The screen mounting frame of the present invention is used in combination with a carbon chip mounting plate 9 as shown in FIG. After attaching the carbon film to the carbon film mounting plate 9 and attaching the desired screen to the screen mounting frame, bring the carbon film mounting plate 9 and the screen mounting frame into close contact, and operate the operation button 10 for degassing. By removing air from the opening 5, the screen and carbon tissue are brought into close contact with each other, the degree of adhesion is checked using a vacuum gauge 11, and the screen is printed by irradiating light from the direction of the transparent plate 2.

Since the screen mounting frame of the present invention is used as described above, it is necessary to prevent the holding plate 8, pins, etc. from being higher than the cover plate 4.

The screen mounting frame of the present invention allows the screen to be installed and removed easily in a short time at an angle that minimizes moiré for each page, improving work efficiency, and since it does not need to be fixed with tape, etc. This prevents the carbon tissue from being contaminated.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the screen mounting frame of the present invention with a partially missing part, Fig. 2 is a partially enlarged sectional view taken along line A-A in Fig. 1, and Fig. 3 is a diagram showing the screen mounting frame of the present invention in use. Explanatory diagrams are shown respectively. 1... Outer frame, 2... Transparent plate, 3... Deaeration groove,
4... Covering plate, 5... Degassing opening, 6... Tape, 7... Magnetic material, 8... Holding plate, 9... Carbon tissue mounting plate, 10... Operation button, 11...
...vacuum gauge.

Claims (1)

[Scope of utility model registration request] An outer frame 1 and a transparent plate 2 attached to the outer frame 1
, a deaeration groove 3 provided near the periphery of the screen mounting surface side of the outer frame 1, a cover plate 4 on the deaeration groove 3, and a deaeration groove provided in the cover plate 4. an opening 5; a magnetic body 7 attached to the inside of the screen mounting surface of the outer frame 1 along the cover plate 4; and a presser plate 8 that is coupled to the magnetic body 7 by magnetic force. and a screen mounting means configured so as not to be higher than the height of the covering plate 4.A screen mounting frame on which a desired number of screens can be detachably mounted.