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Sheet-through document reading apparatus

A manuscript reading and page-passing technology, which is applied in image communication, electrical components, etc., can solve problems such as inability to give amplitude, difference in amplitude, and unstable conveying speed of registration rollers.

Active Publication Date: 2013-04-03
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the actual conveying speed of the registration rollers differs depending on the length of the document. As a result, the amount of amplitude imparted to the U-shaped turning path varies at the moment when the rear end of the document is separated from the registration rollers.
[0005] In addition, in the conventional image reading device, there is a problem that it is not possible to provide an appropriate amplitude amount according to the weight per unit area of ​​the document.
Specifically, when a document having a thickness, that is, a document with a heavy basis weight is conveyed, the registration rollers tend to slip, so the actual conveyance speed of the registration rollers becomes unstable.
As a result, depending on the weight per unit area, there will be a difference in the amount of amplitude given to the original in the U-turn path.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0023] figure 1 The illustrated document reading apparatus generally includes a scanner 7 as a reading unit of a fixed optical system, and an automatic document feeder (hereinafter referred to as “ADF”) 8 .

[0024] The scanner 7 is fixed directly below the reading position A, and sequentially reads the document D passing through the reading position A for each line. Specifically, in the scanner 7 , the lamps 71 such as LEDs emit light toward the reading device A through the reading glass 72 . The reflected light from the document D at the reading position A is incident on the imaging lens 76 via the mirrors 73 , 74 , and 75 , and is then imaged by the imaging unit (CCD color line sensor) 77 .

[0025] like figure 1 , figure 2 As shown, the ADF 8 includes: a tray 81 , a paper feeding unit 82 , an alignment conveying unit 83 , a reading conveying unit 84 , a guide unit 85 , a discharge unit 86 , a CPU 87 and a discharge tray 88 .

[0026] The tray 81 is configured so that ...

no. 2 approach ）

[0051] Next, the document reading apparatus according to the second embodiment will be described. However, in the document reading apparatus of the present embodiment, the configuration of the document reading apparatus corresponding to the first embodiment, the configuration of the processing steps, The processing steps are denoted by the same reference numerals and step numbers, and their descriptions are omitted.

[0052] exist Figure 7 , if ADF10 and figure 1 In comparison with the ADF 8 shown, the difference lies in that it also includes a swtich back path (indicated by a dashed-dotted line in the figure) P, which is used for scanning through the document D in order to be able to read both sides of the original document D. The front and back sides of the document D at the position A are reversed and fed again to the upstream side of the reading position A (the registration roller 83 a ). ADF10 except figure 1 In addition to the discharge unit 86 shown, a reverse conve...

no. 3 approach ）

[0071] Next, the document reading apparatus according to the third embodiment will be described, but in the document reading apparatus of the present embodiment, the configuration and processing steps of the document reading apparatus corresponding to the first embodiment are described. The processing steps are marked with the same reference numerals and step numbers, and their descriptions are omitted.

[0072] exist Figure 10 , Figure 11 , if ADF20 and figure 1 , figure 2 The ADF8 shown is different in that it includes a weight per unit area sensor SE3 in addition to the sensors SE0 and SE1 (in this figure, the sensors SE0 and SE1 are not shown). The basis weight sensor SE3 is, for example, an active sensor to which ultrasonic waves are applied, and is arranged slightly upstream of the contact portion between the rollers 83a and 83b, and is arranged with the transmission side and the reception side sandwiched between the conveying path. In the sensor SE3 , the transmi...

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Abstract

A sheet-through document reading apparatus in the present invention can give appropriate amount of amplitude no matter how long the document is. A sheet-through document reading apparatus including: a document tray for containing a plurality of documents; a determination unit that determines a length of a document on the document tray; a feed unit that separates and feeds a document on the document tray; a resist convey unit that performs consistency processing on the document fed by the feed unit; a first drive unit that rotationally drives the resist convey unit; a read convey unit that feeds the document subjected to consistency processing by the resist convey unit; a second drive unit that rotationally drives the read convey unit; a reading unit that reads, at a fixed reading position, the document conveyed by the read convey unit; and a control unit for changing a relative conveying velocity between the resist convey unit and the read convey unit on the basis of a result of the determination by the determination unit.

Description

technical field [0001] The present invention relates to a sheet-through document reading device, and more particularly, to a document reading device that generates waving (slack) in the document between the alignment conveying unit and the reading conveying unit. Background technique [0002] In the conventional document reading apparatus, each document mounted on the document tray is conveyed to the image reading unit by the sorting roller, the registration roller, and the reading roller. Here, by setting the conveying speed v1 of the original on the registration roller to be slightly higher than the conveying speed v2 of the reading roller, the original is formed on the original in the U-shaped revolving path between the registration roller and the reading roller. amplitude. As a result, the speed fluctuation when the trailing end of the original is separated from the contact portion of the finishing roller is absorbed by the wave amplitude formed in the original (for exa...

Claims

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Application Information

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IPC IPC(8): H04N1/047
CPCH04N1/00588H04N2201/0081H04N1/00652H04N1/00774H04N1/00694H04N1/12H04N1/047H04N1/00689H04N1/00713H04N1/00602H04N1/193
Inventor 西川浩志
Owner KONICA MINOLTA BUSINESS TECH INC