JPH07128929A - Document reader - Google Patents

Abstract

PURPOSE:To provide a document reader not damaging an original page at the time of separating, attracting and carrying it. CONSTITUTION:The linear velocity of a scanning unit is variably adjusted by a speed control means. While the page of the book original 14 is separated, attracted and then, carried up to the position of a page carrying roller 53 provided in a page housing guide 52, scanning is executed by the scanning unit and its speed at this time is lower than a normal speed. The feeding of the page up to the position of the page carrying roller 53 is controlled at the feed rate of the page after passing a paging part page detecting sensor 61 detecting the presence of the separated/attracted page.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original reading device having a page turning reading function for book originals used as an original reading device for copying machines and facsimiles.

[0002]

2. Description of the Related Art In recent years, various document reading apparatuses have been developed which are configured to automatically turn pages of a document which has been read after reading information of a book document. The present applicant has, as this type of document reading apparatus, a page turning reading means (scanning unit) having a turning belt for turning a page and a page feeding roller for feeding a page turned over by the turning belt to a storage guide. ) Is reciprocally moved with respect to the document surface of the book document that is opened and placed at the document reading position with the reading surface of the document facing upward, so that the pages of the book document are turned one by one by the page turning means. Separately, a document reading apparatus has been proposed which performs the page turning operation of the book document and the scanning of reading the document information. According to the document reading device according to this proposal, page turning scanning and document reading scanning of a book document, which requires a great deal of labor for copying work, can be completely automated, and productivity of copying etc. is significantly improved. A multifunctional document reading system can be realized.

In this document reading apparatus, FIG. 1 to FIG.
As shown in FIG. 6, the page-turning means (turning belt unit 18) is stretched around the driving roller 34 and the driven roller 35, and the turning belt 33 is attached to the charging rollers 36a and 36b.
By electrostatically attracting the uppermost page of the book document 14 that is opened and placed on the document table 13 to the lower surface of the turning belt 33, the scanning unit 15 is reciprocally moved, The document reading / scanning of the book document 14 and the page turning operation are performed.

Here, the book original 14 is attracted and lifted by the turning belt 33 of the turning belt unit 18.
The page storage guide 5 arranged at the rear of the separation position of the page along with the movement of the scanning unit 15.
2 toward the inside of the page conveying roller 53 and the pressure roller 5
4 is conveyed.

Further, the pages that have been separated and stored are turned over as they are turned over, and the reverse roller 6 passes near the center of the binding portion of the book document 14 as shown in FIG. Is discharged to.

[0006]

In the document reading apparatus described above, the scanning unit 15 is temporarily stopped at the page turning position of the book document 14 and the turning belt 33 of the turning belt unit 18 causes the book document 14 to move.
After lifting the page of the reverse roller (separation roller)
The speed of the scanning unit 15 was controlled so that the linear speed of the scanning unit 15 was returned to the original linear speed (120 mm / sec) when the page separation operation of 6 was completed.

However, in the speed control method of the scanning unit 15 as described above, the pages separated and adsorbed by the turning belt 33 of the turning belt unit 18 are not properly conveyed into the page storage guide 52, and the pages of the page storage guide 52 are not conveyed. When a phenomenon such as contact with the end portion occurs, there is a problem that the page that is separated and adsorbed and conveyed is broken or torn.

The present invention has been made in view of the above points, and an object thereof is to provide an original reading apparatus which does not damage an original page when the pages are separated and sucked and conveyed.

[0009]

According to the present invention, in order to solve the above-mentioned problems, the page turning reading means is reciprocally moved with respect to the document surface of a book document which is opened and placed at the document reading position. As a result, in the document reading device for separating the pages of the book document one by one by the page-turning reading means and performing the page-turning operation of the book document and the scanning of reading the document information,
It is configured to include a speed control means for variably adjusting the linear speed of the page turning reading means.

Here, after the pages of the book document are separated and adsorbed by the page turning reading means, they are conveyed to a position higher than the position of a page conveyance roller provided in a page accommodating guide for accommodating the adsorbed pages. While scanning, the speed of the page turning reading means is scanned at a speed lower than the normal speed.

Further, after the page is fed to the page conveying roller position, it passes through a page detecting means for detecting the presence / absence of a separated suction page provided in the turning belt unit in the page turning reading means. Controlled by the page feed amount.

[0012]

According to the present invention, the linear velocity of the page turning reading means is variably adjusted by the speed control means.

Further, after the pages of the book document are separated and adsorbed by the page turning reading means,
The speed of the page turning reading means is scanned at a speed lower than the normal speed while being conveyed to a position higher than the position of the page conveying roller provided in the page storage guide for storing the adsorbed page.

Further, after the page is fed to the page-conveying roller position, it passes through a page detecting means for detecting the presence or absence of a separated suction page provided in the page-turning belt unit in the page-turning reading means. It is controlled by the page feed amount.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1 and FIG. 2, when reading a sheet original or only one page of a book original 14, the original is placed on the contact glass 12, the original is pressed by a pressure plate (not shown), and the drive motor 22 drives the motor pulley 22a. , Timing belt 21, drive pulley 20
a, the scanning unit 15 via the timing belt 19
While scanning in a predetermined direction, the document reading position 23
The original on the contact glass 12 with the light sources 24a, 24b
Illuminated by, and the optical image is reflected by the mirrors 25, 26, 2
7. An image is formed on the photoelectric conversion element 29 via the imaging lens 28.

On the other hand, when a plurality of pages of the book original 14 are continuously read, the book original 14 is opened and placed on the original plates 13a and 13b, and then the pressing sheets 37 and 3 are placed.
The document trays 13a and 13b are independently raised so that the document surface of the book document 14 is pressed with a predetermined pressure by 8. The scanning of the scanning unit 15 at the time of reading the book original in this case is the same as that of the sheet original described above, but the reading position of the book original 14 is
1 and 2, the reading unit 17 uses the reading position 32 to illuminate the book manuscript 14 with the light sources 30a and 30b, and the optical images thereof are reflected by the mirrors 31, 26, 27, and 27. An image is formed on the photoelectric conversion element 29 via the image lens 28.

Next, a document page turning operation when a plurality of pages of the book document 14 are continuously read will be described. In FIG. 1, the scanning unit 15 at the home position at the left end of the apparatus main body 11 scans and moves in the right direction so that the document page of the book document 14 is read by the reading unit 17. Then, when the reading unit 17 of the scanning unit 15 finishes reading the document pages up to the edge of the right page of the book document 14, the scanning direction of the scanning unit 15 is reversed, and the scanning unit 15 is faster than its reading speed. At a high speed (120 mm / sec in this embodiment), the document page turning operation of the book document 14 that has been read is started.

In this turning operation, first, the scanning unit 15 is scanned in the left direction, and the right page edge of the book document 14 is detected by the reading means 17. Thereafter, the scanning unit 15 is stopped at the position where the right page end of the book document 14 reaches the center of the turning belt unit 18, and in this state, as shown in FIG. Then, pick up the page that has been read and lift it.

At this time, when the accuracy of the above-described document edge detection is poor, the position where the turning belt unit 18 is lifted may be too close to the binding portion of the book document 14, as shown in FIG. There is a nature. When the page-turning scanning of the document page is continued in such a state, the page attracted by the page-turning belt 33 is not fed into the page storage guide 52, and there is a high possibility that the page is damaged.

Therefore, in the document reading apparatus of the present embodiment, as described above, the page-turning section page detection sensor 61 is used in the vicinity of the driven roller 35 of the turning belt 33 in the state where the turning belt unit 18 is lifted. ,
The turning belt 33 detects whether or not the page is turned over to prevent the above document damage.

That is, when the page-turning section page detection sensor 61 detects a page while the page-turning belt unit 18 is being lifted, it is determined that the page is not turned up assuming the state shown in FIG. The turning operation is interrupted, the scanning unit 15 is scanned in the direction opposite to the turning operation direction, the scanning unit 15 is returned to the turning operation start position, and the turning operation for the same page is executed again.

On the other hand, in the case where the top-page page of the book original 14 is adsorbed to the page-turning belt 33 and the page-turning belt unit 18 is lifted, the page-turning section page detection sensor 61 does not detect this page. Has
When it is determined that the normal turning operation as shown in FIG. 3 is in progress, the scanning unit 15 is operated for a predetermined time (1 in this embodiment).
After being stopped, the speed is lower than the speed at the start of the turning operation (6 in this embodiment) in the page turning direction.
The scanning unit 15 is caused to scan at 0 mm / sec).

After that, when the above-described normal turning operation advances by a distance (or time) corresponding to the turning page, and the turning page detecting sensor 61 detects the end of the page, as shown in FIG. The reverse roller (separation roller) 6 is pressed against the driven roller 35 of the turning belt 33 at a portion thereof. The reverse roller 6 is rotatably driven in a direction that prevents the pages that are attracted to the turning belt 33 from entering the page storage guide 52 in a normal state. When more than one page has entered, the second and subsequent pages rotate in a direction that prevents entry into the page storage guide 52, and when there is one page, the page is guided by losing the advancing force of this page. Is configured.

When the scanning of the scanning unit 15 proceeds in this way, the pages separated and adsorbed on the turning belt 33 are
As shown in FIG. 5, the page-turning belt 33 and the page-conveying rollers 53 arranged on the page-storing guide 52 are rotated to convey the sheet into the page-storing guide 52.

Scanning unit 1 in this embodiment described above
FIG. 6 shows a velocity diagram of the turning operation of No. 5. In FIG. 6, point A is the point where the scanning unit 15 starts the document page turning operation, and the scanning unit 15 starts scanning leftward in FIG. 1 from this point A at a speed of 120 mm / sec. .

The leftward scanning of the scanning unit 15 is stopped for 1 second at point B in FIG. 6, during which the page is attracted to the turning belt 33 and the turning belt unit 18 is displaced upward (page). Separation) is performed.

The scanning unit 15 stopped for 1 second
Is then scanned to the left of the gait tab at a speed of 60 mm / sec.

Point C in FIG. 6 is the point where the advancing end portion of the page adsorbed on the turning belt 33 is detected by the turning section page detection sensor 61, and l is adsorbed on the turning belt 33 in FIG. It shows the length of the page from the position where the advancing end of the page is detected by the turning-page page detection sensor 61 to the contact with the page transport roller 53.

At the point C, the moving amount of the page advancing end due to the scanning of the scanning unit 15 after the page advancing end is detected by the page turning portion page detection sensor 61 is equal to or longer than the length l. After a lapse of time (point D in FIG. 6), the scanning unit 15 again moves 120 m
Scanning is performed at a speed of m / sec.

On the other hand, behind the page conveying roller 53,
The guide section page detection sensor 60 is provided, and it is determined whether the page is normally turned over according to whether the guide section page detection sensor 60 detects the page within a predetermined time.

In this way, the scanning unit 15 advances, and the discharge of the page stored in the page storage guide 52 is started from the vicinity of the center of the binding portion of the book document 14.
After that, the scanning unit 15 is moved to the reading start position and starts reading scanning of the second page.

By the way, as another control method of the scanning speed of the scanning unit 15, the scanning unit 15 is set to 120 m again.
There is also a method in which the position where the scanning starts at m / sec is set to the time when the guide section page detection sensor 60 detects the leading edge of the page. In this method, the trailing edge of the page passes the page conveying roller 53. However, while the guide section page detection sensor 60 detects, the scanning unit 15 is 60 mm /
Since scanning is performed at a low speed of sec, the efficiency of the page turning operation becomes poor.

[0033]

According to the present invention, since the scanning unit scans at a low speed when the scanning unit performs the page turning operation, it is possible to determine whether or not the page is surely turned over by the turning unit page detection sensor. This can be confirmed, and it becomes possible to prevent the document from being broken or torn during this page turning operation, and a reliable and safe page turning operation can be performed. Further, since the scanning unit is scanning at a high speed except when confirming the page position, efficient page turning scanning can be performed.

[Brief description of drawings]

FIG. 1 is a schematic side view showing the overall configuration of a document reading apparatus of the present invention.

FIG. 2 is a schematic sectional view of a scanning unit in the document reading apparatus of the present invention.

FIG. 3 is a schematic side view showing a start state of a turning operation of the scanning unit.

FIG. 4 is a schematic side view showing a defective state of a turning operation of the scanning unit.

FIG. 5 is a schematic side view showing a progressing state of a turning operation of the scanning unit.

FIG. 6 is a velocity diagram of a turning operation of the scanning unit.

FIG. 7 is a schematic side view for explaining a turning operation of the scanning unit.

[Explanation of symbols]

 6 Reverse Roller 12 Contact Glasses 13a, 13b Document Plate 14 Book Document 15 Scanning Unit 17 Reading Means 18 Turning Belt Unit 19,21 Timing Belt 22 Drive Motor 21,32 Reading Position 33 Turning Belt 34 Driving Roller 35 Driven Rollers 36a, 36b Charging Rollers 37, 38 Presser sheet 52 Page storage guide 53 Page transport roller 54 Pressing roller 60 Guide section page detection sensor 61 Turning section page detection sensor

Claims (3)

[Claims] 1. A page of the book document is read by the page turning reading unit by reciprocally moving the page turning reading unit with respect to the document surface of the book document opened and placed at the document reading position. An original reading apparatus which separates each page and performs a page turning operation of the book original and a scanning operation for reading the original information, characterized by including a speed control means for variably adjusting the linear speed of the page turning reading means. apparatus. 2. The pages of the book document are separated and sucked by the page-turning reading means, and then conveyed to a position higher than a position of a page-conveying roller provided in a page accommodating guide that accommodates the adsorbed pages. 2. The document reading apparatus according to claim 1, wherein during the interval, the speed of the page turning reading means is scanned at a speed lower than a normal speed. 3. The page feeding to the position of the page conveying roller after passing through a page detecting means for detecting the presence or absence of a separation suction page provided in a turning belt unit in the page turning reading means. The document reading device according to claim 2, wherein the document reading device is controlled by a page feed amount.