JPH07128937A - Document reader - Google Patents

Abstract

PURPOSE:To prevent a book document from being damaged at the time of fitting by arranging a cylindrical member larger than the outside dimension of a driving roller and having the formation of a tapered part on the front surface side of a device main body in the central region of the driving roller and between paging belts. CONSTITUTION:For the paging belt 16, the bottom end 30a of a front side plate 30 is extended slightly downward from the paging belt 16 and made round, so that the leading edge of the inner side of the book document is guided to the lower side of the paging belt 16 and prevented from catching thereon. For the paging belt 16a, a guiding roller 31 is set a little larger than the outside dimension of the driving roller 14 and the tapered part 32 is formed on the front surface side of the device main body, so that the leading edge of the inner side of the book document 100 is guided to the lower part of the paging belt 16a by the guiding roller 31 and the tapered part 32 and the book document 100 is prevented from catching on the paging belt 16a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to slide a document table on which a book document is opened and placed from the front side to the back side of the apparatus main body and mount it at the document reading position. By reciprocating the carriage equipped with the page turning means and the reading means with respect to the surface,
The present invention relates to a document reading device that separates pages of the book document one by one and performs page turning operation of the book document and scanning of reading document information.

[0002]

2. Description of the Related Art A document reading device such as a copying machine or a facsimile having a book document image reading function and a page turning function is already known, and is disclosed in Japanese Patent Laid-Open No. 4-81164.
It is disclosed in Japanese Patent Publication No. This document reading device
The entire document reading unit is opened with a hinge provided at the rear part as a center, and a book document is placed on a document table to mount the document.

[0003]

However, in the above-described conventional document reading apparatus, the reading unit having a considerable weight has to be lifted to load the document, and there is a problem that the operability is poor. In addition, it is necessary to provide a protective cover to prevent the user from directly touching the drive unit of the reading device or the circuit that applies a high voltage to the turning belt when the document is mounted, which increases the cost.
It was a factor of weight increase. Further, since the document reading unit is supported by the hinge, a space for rotating the document reading unit is required, and it is difficult to reduce the size of the entire apparatus.

The present invention has been made in view of the above-mentioned conventional problems.
It is an object of the present invention to provide a document reading device that can prevent a book document from being damaged when the book document is pulled out and can be loaded.

[0005]

In order to achieve the above object, the present invention is directed to a document reading position by sliding a document table on which a book document is opened and placed from the front side to the back side of the apparatus main body. Mounted on the book document and reciprocally moving the carriage having the page turning means and the reading means with respect to the document surface of the book document, the pages of the book document are separated one by one, and the page turning operation of the book document is performed. Further, in the document reading device for reading and scanning the document information, the page turning unit has a folding belt stretched between a driving roller and a driven roller, and a charging roller for applying a high voltage to the turning belt. The turning belt is divided in the running direction, and is substantially larger than the outer dimension of the driving roller in the substantially central region of the driving roller and between the turning belts. Ku is characterized by arranging the cylindrical member taper portion is formed in the apparatus main body front side.

[0006]

According to the above construction, since the cylindrical member having the taper portion formed on the front side of the main body of the apparatus is arranged in the substantially central region of the drive roller and between the turning belts, the outer dimension of the drive roller is slightly larger. When the book document is slid and loaded, the upper edge of the book document hits the tapered portion of the cylindrical member and is guided under the turning belt to prevent the book document from being damaged by the turning belt or the like.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram showing an example of a document reading apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing the configuration of the carriage. 1 and 2, reference numeral 1 denotes a document table on which the book document 100 can be placed in a two-page spread state. The document table 1 includes a pair of left and right elevating mechanisms 1a, 1 corresponding to respective pages 101, 102 of a book document 100 in a spread state.
b, and these elevating mechanisms 1a and 1b are book originals 10
The book manuscript 100 is urged upward in the drawing so that the book manuscript 100 is lifted and lowered separately according to the thickness and the degree of opening, and the book manuscript 100 is pressed with a constant pressure by the manuscript pressing sheets 36 and 37 described later. There is. This document table 1 can be slid with respect to the apparatus main body by a slide portion 1c described later,
The original is loaded in the pull-out method. Further, 2 is a carriage on which a document reading means 3 and a page turning means 4 which will be described later are mounted, and the carriage 2 is driven by a driving means 50.

In FIG. 2, the document reading means 3 includes a reduction optical system including illuminations 5A, 5B, mirrors 6, 7, 8 and a lens 9 and a known photoelectric conversion element 10 such as a CCD.
When the carriage 2 scans and moves from the left side to the right side in FIG.
No. 02 original image is read. Also, 1
Reference numeral 1 denotes an optical path switching mirror that moves forward and backward with respect to the sheet original reading position Ps. By moving the optical path switching mirror 11 forward and backward to selectively position the sheet original reading position Ps, the optical path switching mirror 11 is placed on the contact glass 12. The image of the formed sheet document 13 can also be read.

The page turning means 4 is, as shown in FIGS. 2, 3 and 4, a driving roller 14 and a driven roller 15.
The turning belt unit 20 includes a turning belt 16 which is stretched over the charging belt 17 and charging rollers 17a and 17b which are arranged in pressure contact with the upper running surface of the turning belt unit 20. In the turning belt unit 20, the shaft of the driving roller 14 is grounded, and the turning belt 16 has a two-layer structure of a high resistance layer on the surface and a medium resistance layer on the inside. In addition, the charging roller 1
7a and 17b have their axes connected to the negative and positive electrodes 18, respectively, and the charging roller 17a is shown in FIG.
As shown in FIG. 5A, the charging roller 17b is formed into a flat roller, and as shown in FIG. 5B, the charging roller 17b is formed into a roller having periodic unevenness. A gear 21 is rotatably attached to one side of the carriage 2, and the gear 21 is a drive gear 2 provided at the end of the drive roller 14.
It meshes with the rack 2, which is fixed in parallel with the moving direction of the carriage 2. The diameters of the gears 21, 22 and the driving roller 14 are set so that the turning belt 16 rotates at the same speed as the moving speed of the carriage 2. Here, the charging roller 17
When a high voltage is applied from a and 17b, an unequal electric field is formed on the turning belt 16, and the unequal electric field generates an attraction force for attracting a page of the book original 100.

In the turning belt unit 20, the turning belt 16 is divided into two belts in the running direction,
The divided folding belts 16 and 16a are stretched around the driving roller 14 and the driven roller 15 with an appropriate gap.
A guide roller 31 as a cylindrical member is provided on the shaft of the drive roller 14 at a position where a space is provided between the turning belts 16 and 16a in the drive roller 14. A rubber roller 23 is provided at a position of the driven roller 15 where the turning belts 16 and 16a are spaced from each other.
It is provided on the shaft. A reverse roller 24 adjacent to the turning belt unit 20 and capable of coming into contact with and separating from the rubber roller 23.
Is provided. The shaft of the reverse roller 24 is rotated in the opposite direction to the rubber roller 23 by a drive gear 25 that meshes with the rack 19 via an idle gear 26. The drive gear 25 is provided with a torque limiter 27. By the torque limiter 27, the reverse roller 24 is driven to rotate when one page of the book original is held and conveyed by the rubber roller 23, but when two or more pages of the book original are held and conveyed by the rubber roller 23, a space between the pages is held. Since the close contact force is small, the returning force of the reverse roller 24 works to return the pages which are multi-conveyed. The reference numeral 34 designates a page storage portion into which the leading end of the flipped original page is temporarily inserted when the driven roller lifting means is operated.

Next, the operation of the above-mentioned device will be described.

First, when the image of the sheet original 13 placed on the contact glass 12 is read, the optical path switching mirror 11 moves to the sheet original reading position Ps,
The light emitted from the illumination 5A and reflected on the original surface passes through a reduction optical system including mirrors 7 and 8 and a lens 9,
It is read by the photoelectric conversion element.

On the other hand, when the book original 100 is set on the original table 1 in the spread state, the optical path switching mirror 11 is retracted from the sheet original reading position Ps, and then the carriage 2 is moved in one direction to irradiate from the illumination 5B. The light reflected by the document surface of the book document 100 passes through a reduction optical system including mirrors 6 to 8 and a lens 9 and is read by the photoelectric conversion element 10. The reading area at this time is two pages in the spread state, and the fact that the reading means 3 has reached the book original 100 is detected by a sensor (not shown).

Next, when the sensor (not shown) detects that the carriage 2 has moved in the other direction and the drive roller 14 has reached the original page 102, the charging roller 1
7, 17a are actuated to generate a suction force on the turning belts 16, 16a. At this time, the driven roller 15 is lifted by the driven roller lifting means,
The document page 102 adsorbed to the turning belts 16 and 16a below 4 is gradually conveyed to the opposite side of the moving direction of the carriage 2 from right to left in FIG. Is inserted into. Then, after the drive roller 14 has passed the original page 102, the original page 102 is pulled out from the storage section 34 and the page is turned with the movement of the carriage 2.

By the way, as shown in FIG.
The slide unit 1c is provided to slide out to the front side of the main body of the apparatus, and when a document is mounted on the document table 1, the book document 100 is placed on the lift mechanisms 1a and 1b of the pulled-out document table 1. Put. And the book manuscript 10
Slide the original table 1 on which 0 is placed back to the original position.
At this time, the upper edge of the book original 100 on the back side is first guided by the guide plate 28 and the roller 29 that assists sliding, passes under the front plate 30 of the carriage 2, and comes into close contact with the turning belt 16 and under the guide roller 31. Belt 1 passing through
It is pushed and fixed in a predetermined position reaching the end portion on the back side of 6a.

Thus, the book original 100 is mounted on the original table 1, but at this time, the upper edge of the book original 100 on the back side is not caught by the turning belts 16 and 16a. With respect to the turning belt 16, as shown in FIG. 7, the lower end 30a of the front side plate 30 is turned over by the turning belt 1
6 is slightly downwardly extended and is rounded so that the upper end edge of the book original 100 on the back side is turned over.
And is prevented from being caught on the turning belt 16. For the turning belt 16a, the guide roller 31 is slightly larger than the outer dimension of the driving roller 14,
By forming the taper portion 32 on the front surface side of the apparatus main body, the back side upper end edge of the book original 100 is guided by the guide roller 31.
And the tapered portion 32 guides the book document 100 to the lower side of the turning belt 16a.
Is prevented from being caught.

Thus, the shaft of the drive roller 14 is provided with the guide roller 31 which is slightly larger than the outer dimension of the drive roller 14 and the tapered portion 32 is formed on the front side of the main body of the apparatus, so that the book original 100 is mounted. It is possible to prevent the top edge of the back side from hitting the turning belt 16a and being damaged.

[0018]

According to the structure of the present invention, a cylindrical member having a taper portion on the front side of the main body of the apparatus is formed in the substantially central region of the drive roller and between the turning belts is slightly larger than the outer dimension of the drive roller. Since the document is arranged by sliding, the upper edge of the document is prevented from being guided to the lower side of the turning belt or the like by the cylindrical member and the taper portion when the document is mounted by sliding, and the document is prevented from being damaged when the document is mounted. be able to.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a document reading apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing the configuration of the carriage.

FIG. 3 is a perspective view of page turning means of the present invention.

FIG. 4 is a perspective view showing an operation when turning a page.

5A and 5B are cross-sectional views of a charging roller.

FIG. 6 is a perspective view showing a document mounting portion.

FIG. 7 is a side view of a document mounting portion.

[Explanation of symbols]

 1 Document Plate 2 Carriage 3 Document Reading Means 4 Page Turning Means 14 Driving Rollers 15 Driven Rollers 16, 16a Turning Belts 17a, 17b Charging Rollers 31 Guide Rollers 32 Tapered Parts 100 Book Documents

Claims (1)

[Claims] 1. A document table on which a book document is opened and placed is slid from the front side to the back side of the apparatus main body and mounted at the document reading position, and page turning is performed on the document surface of the book document. In a document reading apparatus for reciprocally moving a carriage equipped with a reading unit and a reading unit, the pages of the book document are separated one by one to perform page turning operation of the book document and reading scanning of document information. The turning means includes a folding belt stretched between a driving roller and a driven roller, and a charging roller for applying a high voltage to the turning belt. The turning belt is divided in the traveling direction, and the turning belt is substantially centered. A cylinder in which a taper portion is formed on the front side of the main body of the apparatus, which is slightly larger than the outer dimension of the drive roller between the turning belts. Document reading apparatus characterized in that a member.