JPS6025073Y2 - Crimp plate for copy machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate for pressing a document onto a holding portion from behind in an electrophotographic copying machine or other copying machine that copies by using reflected light from the surface of the document.

This type of pressure bonding plate generally has a white surface that comes into contact with the original and has good reflectivity.

If this side is not white, and the size of the original is smaller than the size that can be copied by the copying machine, the non-white parts of the crimp plate that protrude from the original will also be imprinted, making the surrounding area unsightly. This is because if the translucency is high, the reflection of the background part of the original is weak, which impairs the contrast of the copy, and when it is too strong, it causes background fogging.

However, such a white surface is generally contaminated with dirt from the operator's hand or when a document written on both sides is copied before the ink or stamp is completely dry, resulting in a white surface that always remains white. is difficult to maintain.

In particular, since ballpoint pen ink and ink pads are oil-based, organic solvents such as thinner, benzine, and methyl ethyl ketone are required to remove the stains, making it impossible for ordinary users to wipe them off.

The present invention aims to provide a pressure bonding plate that can be easily wiped away from such stains, and is a pressure bonding plate for copying machines provided with a saponified ethylene-vinyl acetate copolymer layer at least on the surface that contacts the original. It is.

The surface of the pressure bonding plate made of saponified ethylene-vinyl acetate copolymer has extremely high resistance to oil and organic chemicals, and is not attacked by oil-based or organic chemical inks.

This prevents oils and solvents from diffusing into the interior of the saponified ethylene-vinyl acetate copolymer, and prevents ink pigments from diffusing and settling internally through oils and solvents, resulting in ballpoint pen inks, stamp inks, and ink pads. Stains caused by such things are limited to superficial stains.

Therefore, dirt can be easily wiped off with a wet rag or the like.

Furthermore, it is possible to prevent copying defects due to reflection spots and decreased reflection due to dirt on the pressure bonding plate.

According to experiments, most stains such as hand stains, ink, ballpoint pen ink, stamp ink, and ink pads can be completely removed by wiping with a damp cloth. Figure 1 shows the proposed method for the document pressure plate of an electrophotographic copying machine. In this example, 1 is a document support frame, 2 is a platen glass, 3 is a document, 4 is a white-colored rubber document pressure plate, 5 is an operating frame for the pressure bonding plate, and 6 is an ethylene-vinyl acetate joint. It is a heavy saponified layer.

Figure 2 shows an example of the structure of the pressure bonding plate, including nitrile rubber,
A saponified ethylene-vinyl acetate copolymer layer 6 is provided on the surface layer 4' of a soft and elastic pressure bonding plate 4 made of vinyl chloride or the like that contacts the original.

FIG. 3 shows another example of the configuration of the pressure bonding plate, in which the surface layer 4' and the back layer 4' of the surface of the pressure bonding plate 4 that contact the original are coated with ethylene.
A saponified vinyl acetate copolymer layer 6 is provided.

This is an effective mode when the front layer becomes soiled and the back layer is used by turning it over so that it is in contact with the document.

As a method for providing the saponified ethylene-vinyl acetate copolymer layer 6 on the surface layer 4' or the back layer 4' of the pressure bonding plate 4,
There is a method of laminating a film or sheet of saponified ethylene-vinyl acetate copolymer.

In addition, in the present invention, not only the white surface of the crimp plate 4 is dirty, but also the surface thereof may become soiled with dust in the air and dirt from hands, and lose its commercial value. can also be used as a plate composed of saponified ethylene-vinyl acetate copolymer.

In the present invention, the saponified ethylene-vinyl acetate copolymer is commonly known, for example, as described in Japanese Patent Publication No. 47
It has an ethylene content of 20 to 60 mol% and a saponification degree of 90 to 100 mol%, as disclosed in Japanese Patent No. 4315 and No. 49-13221.
The film or sheet used as the saponified vinyl acetate copolymer layer includes, for example, 1 industrial material, 2nd winding and 7th winding.
■Eval ■-F film manufactured by Kuraray (from a completely saponified ethylene-vinyl acetate copolymer with an ethylene content of 32 mol%) described on page 32 of the issue (issued on July 1, 1975). Eval II-E film (a 25-μ thick film made of a completely saponified ethylene-vinyl acetate copolymer containing 44 mol % of ethylene), etc. can be used.

Next, a pressure bonding plate using the ethylene-vinyl acetate copolymer film of the present invention (EVAL ■-F film) and a polyvinyl alcohol film, a polypropylene film, a pressure bonding plate using a polyvinyl chloride film, and a polyvinyl alcohol film, A comparative study was conducted on the stain resistance, wipeability, and beauty of copies of pressure bonding plates using polypropylene film and polyvinyl chloride film, and the method and results of the experiment are shown below.

Experimental Method An electronic copying machine was used, and a pressure bonding plate having the following configuration was used.

This invention: A white-colored rubber sheet is laminated with Kuraray's Noevaal ■-F film (a 15μ thick film made of a completely saponified ethylene-vinyl acetate copolymer with an ethylene content of 32 mol%). .

Comparative Example 1: A vinylon [F] film manufactured by Kuraray Co., Ltd. (75 μm thick film coated with completely saponified polyvinyl alcohol) was superimposed on a white colored rubber sheet.

Comparative Example 2: A polypropylene film (thickness 20 μm) was superimposed on a white colored rubber sheet.

Comparative Example 3: A polyvinyl chloride film (thickness: 500μ) was superimposed on a white colored rubber sheet.

The films of the present invention and Comparative Examples 1 to 3 were placed in contact with the original.

Copying was continued for one week using an electronic copying machine equipped with the various pressure-bonding plates obtained in this manner.

The number of copies per day per machine was approximately 50.

The results of the experiment are shown in Table 1 below, showing the beauty of copies produced by electronic copying machines using the pressure bonding plates of the present invention and Comparative Examples 1 to 3, as well as the stain resistance and wipeability of the pressure bonding plates.

(Note 1) Stainability Manuscripts written in pencil on both sides, manuscripts written in ballpoint pen on both sides, manuscripts stamped with stamp ink or vermilion ink on both sides were continuously copied for one week at a rate of about 500 f&, and then crimped. Observation of stains on the board surface.

The manuscript paper used was thick white paper, and the size was A-
It was 4.

○: Almost no stains Δ: Light stains × Severe stains (Note 2) Cleanability: Various types of stains that may occur during actual use can be removed using ballpoint pen, oil-based marker ink (red, black, blue, green), stamp ink,
Water-based felt-tip pens (red, black), fluorescent pens, and ink stamps were applied to the surface of the crimp plate, left for 2 moments, and then the surface was wiped.

○ Dirt has been completely removed Δ Some dirt remains ×
Significant stains remain (Note 3) Beauty of copies A total of approximately 500 copies of manuscripts with pencil writing on both sides, ballpoint pen writing on both sides, and stamps or vermillion ink on both sides for one week. I continued copying.

The manuscript paper used was thick white paper and the size was A-4.
Met.

Next, write a thick white manuscript (size B) with pencil writing on one side.
5) on A4 size paper, and make a copy of the outer periphery of the copy (
The portion protruding from size B5) was observed.

Similarly, a transparent film original (size A4) with pencil writing on one side was copied onto a size A4 paper, and the copy was observed.

○ No stains are found on the outer periphery and center of the copy ∆ There are stains on the outer periphery and center of the copy × Considerable blemishes are found on the outer periphery and center of the copy From Table 1, The pressure bonding plate using the EVAL ■-F film of this invention is stain-resistant and easy to wipe, and the resulting copies are still beautiful even after one week of use, whereas the vinylon ■ film (polyvinyl alcohol film) Although the pressure bonding plate used is not easily soiled, the surface of the film becomes uneven, especially when wiped with a wet cloth, and it can be seen that the copies start to show stains after one week of use.

It can also be seen that the pressure bonding plate using the EVAL ■-F film of the present invention is less stained and easier to wipe compared to the pressure bonding plate using polypropylene film or polyvinyl chloride film, and the resulting copies are also beautiful.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part of the original document pressure bonding plate of the present invention in an electrophotographic copying machine, and FIGS. 2 and 3 are partially enlarged views of examples of the structure of each pressure bonding plate. 1... Original table frame, 2... Platen glass, 3... Original, 4... Original pressure bonding plate,
5... Crimping plate operation frame, 6... Ethylene-vinyl acetate copolymer saponified layer.

Claims (1)

[Scope of utility model registration request] A pressure-bonding plate for a copying machine, which is provided with a saponified ethylene-vinyl acetate copolymer layer on at least the surface that comes into pressure contact with a document.