JPH0419538Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to the improvement of a document holding plate for a copying machine. The present invention relates to a document holding plate that is configured to be able to press and hold a document from the upper surface side of a document placement table, which is provided with a document positioning member that allows a side edge of the document to come into contact with a stepped surface.

"Prior Art and its Problems" An electrophotographic copying machine is already well known, which uses an optical system inside the copying machine to project and expose a document to be copied onto a base paper. 1st
As shown in the figure, there is a document placing table 2 including a transparent plate 1 on which a document A is placed, and a support shaft (not shown) located on the placing table 2 and disposed at one end of the top of the main body 3. ), and a document holding plate 4 is attached to the transparent plate 1 so as to be openable and closable, and a document positioning member 5 is attached to the side end of the transparent plate 1, which also serves as a fixing member for fixing the transparent plate 1 to the main body 3. Furthermore, a light source 6 for illuminating the document A is disposed inside the main body 3 diagonally below the transparent plate 1.

The document holding plate 4 is composed of a pressing member 7 generally made of a flexible rubber or resin material, and a document abutting member 8 formed in the same shape or slightly smaller than the pressing member 7. The structure is such that the original A is brought into close contact with the transparent plate 1.

However, the document positioning member 5 on the document table 2 regulates the position of the document A by bringing the document A into contact with its side edge 5a.
The document positioning member 5 naturally protrudes from the upper surface of the transparent plate 1, and a step corresponding to the thickness of the document positioning member 5 is formed on the document table 2. Therefore, as shown in FIG. 2, when a document is placed on the document table 2 and the document A is pressed from above by the document presser plate 4, the document presser plate 4 is pressed due to the difference in level of the document table 2. Therefore, the entire surface of the transparent plate 1 is not pressed uniformly, and a gap B is created at the side edge of the document positioning member 5. For this reason, the document A located near the side edge of the document positioning member is not pressed sufficiently and the side edge
If Aa is curled, it will rise from the transparent plate 1, causing image defects on the copy side edges.
It had the disadvantage that clear images could not be copied.

Further, since the document holding plate 4 is placed on the document positioning member 5 that protrudes from the upper surface of the transparent plate 1, especially when the positioning members 5 are arranged at both ends of the transparent plate 1, the holding plate 4 The pressing force is significantly reduced, and in the case of an original with a folded part in the center or the like, that part cannot be completely pressed, and a black line appears on the copy.

Furthermore, a light source 6 is provided diagonally below the transparent plate 1.
If more irradiation is performed, the raised side edge Aa of the original A will be in the shadow of the side edge 5a of the original positioning member 5 and will not be illuminated, resulting in black streaks appearing on the copy. It also had various drawbacks such as.

In order to prevent this drawback, conventionally, a protrusion corresponding to the level difference of the document table was provided on the back side of the document holding plate to prevent the document from lifting up. This poses a problem in terms of the accuracy with which the document holding plate is lowered, and it is troublesome to adjust the positioning when assembling the copying machine.

Further, as shown in FIG. 3, the edge side of the document positioning member 5' is chamfered diagonally downward, and the side edge Aa of the document A is inserted into the chamfered portion 5b', thereby solving the above-mentioned drawback. No. 53-110131) has been proposed, but even this technique cannot completely eliminate the above drawbacks, and especially in the case of document A with curled side edges Aa, the insertion is extremely troublesome. During use, defects such as crushing of the chamfered portion 5b' are likely to occur, which also poses a practical problem.

In order to eliminate this drawback, the Utility Model No. 58-26575
In No. 1, a plate-like member capable of pressing and holding the entire surface of the document mounting table 2 including the positioning member 5, and a bag portion having an elastic member sheet containing fluid sealed on the lower surface of the plate-like member are used to hold the document. A pressing plate is configured, and by pressing and holding the original with the pressing plate, the bag portion comes into close contact with the transparent plate 1 via the original A, and a step portion is formed between the transparent plate 1 and the original positioning member 5. A technique is disclosed in which the curve is curved along the .

However, in this technology, the use of a fluid-filled bag in the document holding plate, which is most frequently opened and closed, tends to cause various drawbacks in terms of manufacturing and usage, as described below. .

For example, in terms of structure, in order to form the bag portion for enclosing the fluid, the document holding plate must be manufactured with sealing performance in mind, and a step of injecting fluid into the bag portion is also required; The manufacturing process becomes complicated.

In addition, the original is not limited to a flat object such as paper, but may be a book with a hard cover, and in such cases, the bag part presses against the corner of the hard cover and the bag part If a hole is formed in the bag, or the sealing surface of the bag portion may peel off due to repeated opening and closing operations, and in such cases, the function is completely lost.

Furthermore, in this prior art, even if the sheet that encloses the fluid and forms the bag portion is made of a thin elastic material, as long as the fluid is used, the sheet can be accurately curved into an L-shape along the shape of the stepped portion. This is impossible, and voids similar to those in the prior art will inevitably be created at the corners, making it impossible to completely prevent the side edges of the document from lifting up.

In view of the shortcomings of the prior art, the present invention has been developed to make it possible to copy clear images by preventing light leakage and lifting of the original, and also to eliminate the need for any troublesome operations during assembly and use. Its purpose is to provide boards.

"Technical Means for Solving the Problem" The present invention relates to a document holding plate used in a document placing table, in which a document positioning member is arranged via a step at the side edge of a transparent plate on which the document is placed. be.

A feature of the present invention is that the side edge thereof can face the stepped portion through a predetermined gap, at least on the side of the transparent plate from the document positioning member, more specifically, slightly inside the stepped surface. The present embodiment has a pressing member positioned at , and at least the side of the pressing member that faces the stepped portion is made of a material that has shape retention properties that are harder than the original contacting member. In this case, the pressing member is formed of a resin molded body to satisfy the above requirements.

A document abutting member made of a flexible thin layer of rubber, soft resin, etc. is disposed on the lower surface of the pressing member with its side end extending toward the positioning member from at least the side end of the pressing member. point.

The document abutting member is configured to be able to hold the document while being curved along the stepped portion when pressing the document.

It is in.

"Operation" According to this technical means, since the pressing member is positioned slightly inside the stepped surface as shown in FIG. 5, an L-shaped gap is formed between the pressing member and the stepped surface when pressing the document. Since the side edges of the original pressing member are made harder than the original contacting member, the pressing member forcibly presses the original contacting member from the back side when pressing the original. Easily curves into an L shape.

Moreover, since the document abutting member is formed of a flexible thin layer, it is extremely easy to curve the document, and it can be accurately curved into an L-shape.

"Embodiments" Hereinafter, embodiments of the present invention will be described in detail by way of example based on the drawings. However, unless otherwise specifically stated, the dimensions, materials, shapes, relative positions, etc. of the components described in this example are not intended to limit the scope of this invention, but are merely illustrative examples. It's nothing more than that.

The present invention will be explained below based on the drawings. Note that the same parts as in the conventional example are given the same reference numerals.

4 and 5 show an embodiment of the present invention,
The transparent plate 1 placed on a part of the top surface of the copying machine main body 3 is
It has vertical and horizontal dimensions slightly larger than the maximum size that can be copied by a copying machine, and a document positioning member 5 is disposed at the side end of the dimension.

The document holding plate 24 located on the transparent plate 1 is
Original contacting member 28 that presses the original onto the transparent plate 1
and a pressing member 27 that presses the document abutting member 28 from behind.
is formed of a thin plate-like soft material, such as rubber or soft resin, and is formed such that its side end 28a is positioned outside the side edge 5a of the document positioning member shown by the line Y-Y' in FIG. Further, the pressing member 27 is formed of a molded body of resin or the like, and its side end 27a is formed so as to be slightly positioned from the side edge (stepped portion) 5a of the document positioning member 5.

When pressing the original A on the original placing table 2, the original pressing plate 24 presses the side edge 28 of the original contacting member 28.
a is located outside the side edge 5a of the document positioning member 5;
Also, since the side ends 27a of the pressing member 27 are formed to be located inside the side edge 5a of the document positioning member 5, the document contacting member 28 is not affected by the pressing force of the pressing member 27, as shown in FIG. The sheet is curved along the stepped portion on the document table 2, and is evenly pressed against the entire surface of the transparent plate 1.

``Effect'' Therefore, according to the original document holding plate of the present invention, by utilizing the rigidity of the pressing member located on the back side of the original holding plate, the flexible thin layer is Since the document abutting member consisting of the body is forcibly and accurately curved into an L-shape, there is no room for a gap to be formed at the corner of the stepped portion, and the drawbacks of the prior art described above can be completely eliminated.

That is, even if the side edges of the document are curled, the document is completely brought into close contact with the transparent plate, completely preventing the document from lifting up, and preventing light from outside the copying machine from entering the transparent plate. Since the incidence of light can also be blocked, image defects at the side edges of the document can be prevented and clear images can be copied.

In addition, since the document contacting member of the document holding plate presses the entire transparent plate with a uniform pressing force, even if the document has a folded part in the center etc., the entire document can be placed in perfect contact with the transparent plate. and there will be no black lines when copying.

Furthermore, even when irradiation is performed from a light source disposed diagonally below the transparent plate, the original is not raised, so that the irradiation extends to the side edges of the original, and no black streaks appear on the copy.

Furthermore, the document holding plate according to the present invention is easy to manufacture because it is sufficient to simply attach the document contacting member made of a flexible thin layer to the lower surface of the plate-shaped document holding plate member. Also, even during use, since there is no fluid sealed inside, it is possible to copy even books with hard covers without having to be careful about the copying operation, and a part of the abutment member is damaged due to repeated use. Even if the contact member is damaged or contaminated, it can be used continuously without any reduction in the above advantages, and furthermore, even if the contact member becomes damaged or contaminated, only the relevant contact member needs to be removed and replaced, which is preferable in terms of maintenance.

It has various effects such as

[Brief explanation of the drawing]

1 and 2 show a conventional example of the present invention, in which FIG. 1 is a partial sectional view, and FIG. 2 is an enlarged sectional view of the main part. FIG. 3 is a sectional view of a main part showing another conventional example. Figures 4 and 5 show an embodiment of the present invention, with Figure 4 being a partial cross-sectional view, and Figure 5 being an enlarged cross-sectional view of the main part of the document holding plate placed on the transparent plate. . 1...Transparent plate, 4, 24...Document holding plate, 5...
...Document positioning member, 7, 27...Press member,
8, 28...Document abutting member, A...Document.

Claims (1)

[Scope of Claim for Utility Model Registration] In a document holding plate of a copying machine used for a document placing table, in which a document positioning member is disposed at the side edge of a transparent plate on which the document is placed via a stepped portion, the side edge of the document holding member is a pressing member positioned at least closer to the transparent plate than the document positioning member so as to be able to face the stepped portion with a predetermined gap therebetween; and a side end of the pressing member extending toward the positioning member from at least the pressing member side end. a document abutting member made of a flexible thin layer and disposed on the lower surface of the pressing member in the state, and at least the side of the pressing member facing the stepped portion is made of a harder material than the document abutting member. What is claimed is: 1. A document holding plate characterized in that the document holding member is configured to be able to hold the document while curving the document abutting member along the stepped portion when pressing the document.