JPH08234330A - Original image reader - Google Patents

Abstract

PURPOSE: To prevent the slippage, simplify the structure, and reduce the cost by pressing an original placed on an original table by a sheet-shaped intermediate original pressing cover having openings formed therethrough to position it, and then covering the upper part with a cover. CONSTITUTION: An intermediate original pressing cover 3 is rotated in the closing direction to press an original 1 placed on an original table 2 by a pressing surface 3a. Since opening parts 4 are provided in the thickness direction of the cover 3, air by the wind pressure at pressing is passed from each opening part 4 in a direction B. Thus, the original 1 is positioned in a position for reading an original image, and prevented from being slipped. The original 1 is finally pressed by rotating the cover 3, and a cover 5 is successively closed, thereby, the original image is read by a reading part. Thus, the opening and closing wind pressure of the covers 3, 5 are never imparted to the original 1 placed on the original table 2, and the original 1 is positioned in the position for reading the original image, and prevented from being slipped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile machine, a scanner, a scanner, or a multi-function machine having a combination of these functions. The present invention relates to a document image reading device for reading a document image of.

[0002]

2. Description of the Related Art In a conventional copying machine or the like for forming a copy image by reading a document image by pressing and fixing the document placed on a document table so as not to move, a photographic paper is used. When scanning a document such as a small piece of paper or a voucher on the platen and pressing the platen from above the document before scanning the document image, the pressure of the plate closing the document causes the document to be misaligned or the photographic paper If the original itself is warped, as is often seen in, the original position will be misaligned even if the pressure plate is closed, or the original will be bent and misaligned even if the originals are aligned and placed. When the image is read, the read copy image becomes a defective copy. In such a case, you have to repeat document setting and scanning many times,
The time and money spent for this is enormous.

Therefore, when the pressure plate is closed, an elastic member provided on the pressure plate is applied to push down the guide member against the spring, and the document holding portion presses the leading end side of the set document to set the document surface on the document table. The original position is shifted due to the curl of the leading edge of the original and the original image is read.
An image reading apparatus that prevents a copied image from being a defective copy is known (see Japanese Patent Laid-Open No. 6-178060). However, the original image of a small piece of paper such as photographic paper or a slip that has been curled due to the wind pressure and curl habit of closing the platen is misaligned from the original reading position on the original table and the original image is read. Was occurring.

[0004]

In the above-mentioned conventional document image reading apparatus, a document such as a photographic printing paper or a small piece of paper such as a slip, which is curled due to wind pressure for closing the pressure plate or curl habit, is placed on the document table. There is a problem that the original image is read when the reading position deviates from the original position.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to solve such a problem. That is, even a curled photographic paper or a small original such as a voucher can be easily placed at the reading position on the platen and the position shift can be prevented, so that the cost is reduced. It is an object of the present invention to provide a document image reading apparatus of.

[0006]

In order to achieve the above object, the invention according to claim 1 uses a reading section located directly below the document table in a state where the document placed on the document table is pressed by a pressure plate. In the original image reading device that reads the image,
A sheet-shaped intermediate document pressing plate for pressing and positioning the document placed on the document table, at least one opening formed through the intermediate document pressing plate, and opening / closing to cover the intermediate document pressing plate. And a possible pressure plate. The invention according to claim 2 is characterized in that the intermediate document pressing plate is configured to be openable / closable or removable with respect to the document table. The invention according to claim 3 is characterized in that the openings of the intermediate document pressing plate are arranged in a lattice shape. According to a fourth aspect of the present invention, the pressing surface of the intermediate original document pressing plate is formed in a color in which the shape of the intermediate original document pressing plate cannot be read by the reading unit. According to a fifth aspect of the invention, the intermediate document pressing plate is transparent. According to a sixth aspect of the invention, the intermediate document pressing plate has flexibility. The invention according to claim 7 is characterized in that a scale is formed on the intermediate document pressing plate.

[0007]

The original image reading apparatus configured as described above is
In claim 1, the original placed on the original table is pressed and positioned by a sheet-shaped intermediate original pressing plate having an opening opened in the thickness direction, and the upper part is covered with the pressing plate. It is possible to provide a low-cost original image reading device with a simple structure that can easily place even a small-sized original such as printing paper or a slip at the reading position on the original table and prevent misalignment. .

According to a second aspect of the present invention, the document placed on the document table is pressed and positioned by an intermediate document pressing plate which can be opened / closed or removed in the form of a sheet having an opening opened in the thickness direction, and the document is placed thereon. Since it is covered with a pressure plate, even originals such as curled photographic paper and slips can be easily placed at the reading position on the original table to prevent misalignment and prevent automatic original feeding operation. It is possible to provide a low-cost original image reading apparatus with a simple configuration that does not occur.

According to a third aspect of the present invention, the original placed on the original table is pressed and positioned by a sheet-shaped intermediate original pressing plate having openings arranged in a lattice shape which are opened in the thickness direction, and is positioned above the original. Since it is covered with a pressure plate, even curled photographic paper or small originals such as slips can be easily placed at the correct reading position on the platen, and the simple structure that prevents misalignment reduces cost. It is possible to provide the document image reading apparatus.

According to a fourth aspect of the present invention, the original placed on the original table is positioned by pressing the sheet-shaped intermediate original pressing plate having an opening opened in the thickness direction with a pressing surface of a color that cannot be read. Since it is covered with a pressure plate, it is possible to easily place even curled originals such as photographic paper or slips that are curled without reading the intermediate document pressure plate at the reading position on the platen. It is possible to provide a low-cost document image reading apparatus with a simple configuration that prevents misalignment.

According to a fifth aspect of the present invention, the original placed on the original table is pressed and positioned by the intermediate original pressing plate of a transparent sheet member having an opening opened in the thickness direction, and the upper plate is covered with the pressing plate. As a result, even a curled photographic paper or a small piece of paper such as a voucher can be easily placed at the correct reading position on the platen, and a simple structure that prevents misalignment makes it possible to read original images at low cost. A device can be provided.

According to a sixth aspect of the present invention, the original placed on the original table is pressed and positioned by a sheet-shaped flexible intermediate original pressing plate having an opening opened in the thickness direction, and the upper plate is pressed. Since it is covered with, it is possible to easily place even curled photographic paper or small originals such as slips at the reading position on the platen, and a simple configuration that securely prevents misalignment by cost It is possible to provide a cheap original image reading device.

According to a seventh aspect of the present invention, the original placed on the original table is pressed and positioned by an intermediate original pressing plate having a sheet-shaped scale having an opening opened in the thickness direction, and the upper plate is covered with the pressing plate. Therefore, even originals such as curled photographic paper or slips of small paper can be easily placed at the correct reading position on the platen, and a simple structure that prevents misalignment can reduce the cost of original images. A reader can be provided.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of a document image reading apparatus according to an embodiment of the present invention. A document 1 is placed on the upper surface of an electrophotographic copying machine as an image forming apparatus to read a document image. Manuscript stand 2 (contact glass)
Is provided. The document image reading means is a document table 2
It is located directly below. A characteristic configuration of the present invention is that an intermediate document pressure plate 3 which is openable and closable independently of the document pressure plate is pivotally supported between the document pressure plate 5 and the document table 2.

The intermediate document pressing plate 3 is composed of a flexible transparent sheet member having a large number of openings 4 as through holes, and is rotated in the direction of arrow A shown by a hinge 3c. The original platen 2 can be opened and closed, and the original plate 1 on the original platen 2 is curved in a pressing surface (lower surface).
It is also provided so that it can be pressed by 3a and removed from the document table 2. Since the intermediate document pressing plate 3 is transparent, it is possible to easily confirm the document placement state.
Further, since it has flexibility, it can be pressed down in close contact with a document.

By making the pressing surface 3a into a curved shape, the original 1 can be brought into closer contact with the original table 2 and the occurrence of positional deviation can be further reduced. Various bending directions can be selected such that the central portion in the longitudinal direction projects downward (or upward), or the central portion in the widthwise direction projects downward (or upward). The intermediate document pressing plate 3 is placed on the platen 2 before the closing of the platen 5.
The original 1 is pressed and fixed while being aligned with the upper original reference position. The pressure plate 5 is configured so as to be opened and closed on the document table 2 by rotating in the direction of the arrow A shown around the fulcrum 5b by a biasing means (not shown).
By pressing d with the backing surface 5a, scanning light from a reading unit (not shown) for reading the original image is blocked.

The intermediate document pressing plate 3 is constructed so that it can be detached from the document table 2, so that if the pressure plate 5 has an automatic document feeder, it can be removed from the document table 2 so that the automatic document can be removed. It can be configured so as not to interfere with the feeding operation. The backing surface 5a and the pressing surface 3a have the same color, or the pressing surface 3a has a color in which a reading unit (not shown) for reading a document image has no sensitivity. Therefore, when the document 1 placed on the document table 2 is scanned by the reading unit (not shown), the shape of the intermediate document pressing plate 3 is not read.

In reading the original image of the original 1,
First, the document 1 is placed on the document table 2. Next, the document table 2
The intermediate document pressing plate 3 is rotated in the closing direction and pressed by the pressing surface 3a on the document 1 placed on the. On this occasion,
Since the opening 4 is opened in the thickness direction of the intermediate document pressing plate 3, the air due to the wind pressure when the intermediate document pressing plate 3 is rotated and pressed from each opening 4 in the direction of arrow B in the figure. To pass. Therefore, the document 1 on the document table 2 is positioned at a position where the document image is read, and the positional deviation is prevented.

Finally, the intermediate document pressing plate which presses the document 1 placed on the document table 2 by the pressing surface 3a and positions it at the position where the image of the document is read to prevent misalignment. By rotating and pressing 3 and then closing the pressure plate 5, the reading unit (not shown) can read the original image. Therefore, the opening / closing air pressure of the pressure plates 3 and 5 is not applied to the original 1 placed on the original table 2, and the original 1 is positioned at the position where the original image is read and the positional deviation is prevented.

The sheet-shaped intermediate document pressing plate 3 having the opening 4 formed therethrough may be a net stretched on a hollow frame, which has the same effect and a sufficient air passage amount. It is also possible to use a plate provided with an air vent hole that can be secured at the same position, and the same effect is obtained. The shape, number, arrangement interval, etc. of the openings 4 provided in the intermediate document pressing plate 3 are not limited, and one or a plurality of openings may be provided, and they are arranged in a lattice shape as shown in the drawing. It is also possible. Since it is possible to easily adjust the position of the original 1 of a curled small piece of photographic paper or a slip through the ends of a finger or a writing instrument through the openings 4 arranged in a grid on the intermediate original pressing plate 3. , The document image can be positioned at a position where the image is read, and can be accurately aligned.

FIG. 2 is a diagram for explaining the operation of the present invention. The opening 4 provided in the intermediate document pressing plate 3 is sized so that the end portion of a finger, a writing instrument, or the like can be inserted thereinto.
A small piece of curled photographic paper or a voucher, which is temporarily fixed in a distorted temporary position by being pressed by the intermediate document pressing plate 3 placed on, is passed through the opening 4 through the end of a finger or a writing instrument. This is convenient because it is possible to position and align while adjusting to the position where the original image is read.

The intermediate document pressing plate 3 may be a transparent member and provided with a scale 3b at the end of the upper surface 3d as shown in the figure.
According to this structure, particularly when the document is positioned and aligned in a position where the image of the document is read while adjusting the position of the document, the center position of the document 1 can be clearly seen and accurate positioning can be performed. Therefore, it is possible to easily position and align the document image at an accurate position where the document image is read.

[0023]

As described above, according to the first aspect of the present invention, the original placed on the original table is pressed and positioned by the sheet-shaped intermediate original pressing plate having the opening formed therethrough. Later, I covered it with a pressure plate, so
Even a curled photographic paper or a small piece of paper such as a voucher can be easily placed at the reading position on the platen to prevent misalignment, and the configuration is simple and the cost can be reduced.

According to the second aspect of the present invention, the document placed on the document table is positioned by pressing it with a sheet-shaped openable or removable intermediate document pressing plate having an opening formed through it. Furthermore, since I covered it with a pressure plate,
A curled photographic paper or a small piece of paper such as a voucher can be easily placed at the reading position on the platen, preventing misalignment and a simple structure that does not interfere with automatic document feeding operation at low cost A document image reading device can now be provided.

According to the third aspect of the present invention, the document placed on the document table is positioned and pressed by a sheet-shaped intermediate document pressing plate having openings formed in a through-hole array arranged in a lattice shape. Since the top is covered with a pressure plate, it is possible to easily place even curled photographic paper and small originals such as slips at the correct reading position on the platen with a simple configuration to prevent misalignment. It has become possible to provide a manuscript image reading device at a low cost.

According to the fourth aspect of the present invention, the original placed on the original table is pressed by the pressing surface of a color which cannot read the sheet-shaped intermediate original pressing plate having the opening formed therethrough. Since it is positioned and covered with a pressure plate, it is possible to easily place even curled originals such as photographic paper and slips that are curled without reading the pressure plate on the platen at the reading position on the platen. It is now possible to provide a low-cost document image reading apparatus with a simple configuration that prevents misalignment.

According to the fifth aspect of the present invention, the original placed on the original table is pressed and positioned by the intermediate original pressing plate of a transparent sheet member having an opening formed therethrough, and the upper plate is pressed by the pressing plate. Since it is covered, curled photographic paper and small originals such as slips can be easily placed at the correct reading position on the original table, and a simple structure that prevents misalignment and low cost originals An image reading device can now be provided.

According to the sixth aspect of the present invention, the original placed on the original table is pressed and positioned by the sheet-shaped flexible intermediate original pressing plate having the opening formed therethrough, and then positioned. Since the cover is covered with a pressure plate, it is possible to easily place even curled photographic paper or small-sized originals such as slips at the reading position on the platen, and to prevent misalignment firmly by a simple structure It is now possible to provide a low cost original image reading device.

According to the seventh aspect of the present invention, the original placed on the original table is pressed and positioned by the intermediate original pressing plate having a sheet-shaped scale having an opening formed therethrough, and the upper plate is pressed. Since it is covered with, it is possible to easily place even curled photographic paper or small originals such as slips at the correct reading position on the platen, and a simple structure that prevents misalignment and low cost A document image reading device can now be provided.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating an outline of a document image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a state of a main part of the document image reading apparatus according to the embodiment of the present invention.

[Explanation of symbols]

1 ... manuscript, 2 ... manuscript table, 3 ... intermediate manuscript pressing plate, 3a ... pressing surface, 3b ... scale, 3c ...
Hinge, 3d ... top surface, 4 ... opening, 5 ... pressure plate, 5a ... backing surface, 5b fulcrum.

Claims (7)

[Claims] 1. A document image reading apparatus for reading a document image by a reading unit located directly below the document table in a state where a document placed on the document table is pressed by a pressure plate, and a document placed on the document table is pressed. A sheet-shaped intermediate document pressing plate for positioning, at least one opening formed through the intermediate document pressing plate, and a pressure plate that can be opened and closed independently to cover the upper surface of the intermediate document pressing plate. An original image reading apparatus having: 2. The document image reading apparatus according to claim 1, wherein the intermediate document pressing plate can be opened and closed or removed from the document table. 3. The original image reading apparatus according to claim 1, wherein the intermediate original document pressing plate is provided with a plurality of the openings, and the openings are arranged in a lattice shape. 4. The pressing surface of the intermediate document pressing plate is made of a color in which the shape of the intermediate document pressing plate cannot be read by the reading section.
The document image reading device described in 2 or 3. 5. The document image reading apparatus according to claim 1, wherein the intermediate document pressing plate is transparent. 6. The document image reading device according to claim 1, wherein the intermediate document pressing plate has flexibility. 7. The document image reading device according to claim 1, wherein the intermediate document pressing plate is provided with a scale.