JP2002158836A - Manuscript transfer type reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manuscript transfer type reader which can prevent contamination of a shading plate. SOLUTION: An image is read while a manuscript is guided and transferred on a reading surface 2 of an image reading sensor 1 by the shading plate 7. A transparent sheet member 8 covering the shading plate 7 is installed. An aperture whose position and size correspond to the reading surface 2 of the sensor 1 is installed in a part of the sheet member 8. In the course of reading transfer of the manuscript, a sheet surface of the sheet member 8 is made to face the sensor 1, and the manuscript is guided together with the shading plate 7. In the case of shading correction of the sensor 1, the aperture part of the sheet member 8 is made to face the reading surface 2 of the sensor 1, and the shading of the sensor 1 is performed by the shading plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a document conveying type reading apparatus.

[0002]

2. Description of the Related Art A conventional document conveying type reading apparatus includes a shading plate which guides the conveyance of a document and performs shading of the reading sensor in opposition to an image reading sensor for reading an image of the document. There is an image reading apparatus which transports a document to a reading surface of an image reading sensor and reads a document image by a pair of document transport rollers provided upstream and downstream of the image reading sensor. The apparatus disclosed in Japanese Patent Application Laid-Open No. 05-91243 discloses a document transporting type reading apparatus in which the white shading plate is rotatably supported so that the white shading plate can press the document against the reading surface by its own weight. I have.

When a document is conveyed in such a device in a state where the shading plate and the document surface are in contact with each other, if there is an image on the document surface facing the shading plate, the shading plate becomes dirty with time, and the image is read. Can be a problem.

In view of such a conventional problem, the present invention provides another document guide member so as to cover the shading plate, and moves the document guide member at the time of document guide and at the time of shading correction to remove dirt on the shading plate. It is an object of the present invention to provide a document conveying type reading device which can prevent the reading.

[0005]

According to a first aspect of the present invention, there is provided an original transport type reading apparatus which guides the transport of an original in opposition to an image reading sensor which reads an image of the original. And a shading plate that performs shading of the reading sensor. The document is conveyed to the reading surface of the image reading sensor by a pair of document conveying rollers provided upstream and downstream of the image reading sensor. In a document transport type reading apparatus for reading an image, a transparent sheet member is provided between the image reading sensor and the shading plate so as to cover the shading plate.

According to a second aspect of the present invention, in order to achieve the above object, in the original transport type reading apparatus according to the first aspect, an opening having a size corresponding to a reading section of the image reading sensor is formed in the sheet member. The sheet member is arranged so that the surface of the image reading sensor facing the shading plate covers the shading plate when the original is conveyed, and the image reading sensor faces the image reading sensor during shading of the image reading sensor. The opening of the sheet member is arranged on a surface.

According to a third aspect of the present invention, in order to achieve the above object, in the document transporting type reading apparatus of the second aspect, the sheet member comprises an endless belt.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an embodiment of a document transport type reading apparatus according to the present invention. In the apparatus of the present embodiment, a shading plate 7 is provided at a portion facing the image reading sensor 1, and a pair of document transport rollers 3, 4 are provided upstream thereof, and a pair of document transport rollers 5, 6 are provided downstream thereof. The document is conveyed while being guided by the shading plate 7 on the reading surface 2 of the image reading sensor 1 by the conveying roller pairs 3, 4, 5, and 6, and the image is read at that time.

In the present embodiment, the shading plate 7
A transparent sheet member 8 is provided so as to cover. An opening 20 of a corresponding size is provided in a part of the sheet member 8 at a position corresponding to the reading surface of the image reading sensor 1 as shown in FIG. Further, at one end of the sheet member 8, a driving means (not shown) for moving the sheet member 8 along the shading plate 7 is provided, and at the other end, the moved sheet member 8 is urged to return to the original position. A spring 10 is provided as restoring means.

The sheet member 8 is wound up by driving the roller 9 by driving means (a motor or the like), thereby moving the sheet member 8 along the shading plate 7. When the lifting force of the sheet member 8 by the roller 9 is released,
The seat member 8 is returned to the original position by a spring provided at the other end of the seat member 8.

At the time of reading and transporting the document, the facing portion of the image reading sensor 1 is a sheet surface of a transparent sheet member 8 and guides the document together with the shading plate 7. At the time of shading correction of the image reading sensor 1, the sheet member 8 is moved along the shading plate 7, and the opening 20 of the sheet member 8 is moved to the surface facing the reading surface 2 of the image reading sensor 1, and the shading plate 7 is moved. Performs shading of the image reading sensor 1. The movement amount of the sheet member 8 is determined by setting the movement amount for moving the opening 20 of the sheet member 8 to the surface facing the reading surface 2 in advance. A means for detecting the position of the opening 20 of the sheet member 8 may be provided.

FIG. 3 is a sectional view (A) and an enlarged sectional view of a main part of another embodiment of the original transport type reading apparatus according to the present invention. In this embodiment, a transparent endless belt 8a is used in place of the sheet member 8 of the above-described embodiment, and the endless belt 8a is wrapped around rollers 11 and 12, and
Is rotated by driving means (not shown) to move the endless belt 8a along the shading plate 7. The detection of the opening of the endless belt 8a (not shown, but provided with the same as the opening 20 of the sheet member 8 of the previous embodiment) is performed by marking the endless belt 8a and transmitting the marking. The detection is performed by the pattern sensor 13.

[0013]

According to the first and second aspects of the present invention, as described above, the shading plate is covered with a transparent sheet member, the sheet portion is used as a document conveyance guide when the document is conveyed, and the shading plate is corrected when the shading correction is performed. By making the opening of the sheet member face the reading surface of the image reading sensor, it is possible to prevent the shading plate from being contaminated due to the conveyance of the original, and to perform shading reliably with the shading plate during shading correction.

According to the third aspect of the present invention, as described above, the sheet member is formed as an endless belt so that the sheet member of the document guide becomes dirty in addition to the common effects. Move the sheet member to
There is an effect that dirt on the sheet portion serving as the guide surface can be set in an initial state.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a document transport type reading device according to the present invention.

FIG. 2 is a plan view showing a configuration of a sheet member of the embodiment device of FIG. 1;

3A and 3B are a cross-sectional view and a main part enlarged cross-sectional view of another embodiment of the document transport type reading device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 image reading sensor 2 reading surface of image reading sensor 3, 4, 5, 6 document transport roller pair 7 shading plate 8 sheet member 8 a endless belt 9 roller 10 spring 11, 12 roller 13 transmission sensor 20 opening

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 1/00 108 H04N 1/04 103E 1/04 1/12 Z

Claims (3)

[Claims] An image reading sensor for reading an image of a document; a shading plate for guiding the conveyance of the document and shading the reading sensor; and a document conveying roller provided upstream and downstream of the image reading sensor. In a document transport type reading device that transports a document by a pair to the reading surface of the image reading sensor and reads an image of the document by the image reading sensor, the shading plate is covered between the image reading sensor and the shading plate. An original transporting type reading device comprising a transparent sheet member. 2. An original transport type reading apparatus according to claim 1, wherein said sheet member has an opening having a size corresponding to a reading section of said image reading sensor. The sheet member is disposed so that a surface facing the shading plate covers the shading plate, and the opening of the sheet member is disposed on the facing surface of the image reading sensor during shading of the image reading sensor. Document transport type reading device. 3. The original transport type reading apparatus according to claim 2, wherein said sheet member comprises an endless belt.