JPH02152840A - Carrying device for paper sheet - Google Patents

Abstract

PURPOSE:To prevent a reduction in reading rate even if a manufacture error of roller and wrinkling of a document are present by making the carrying speed of a lower stream side driving roller higher than that of an upper stream side driving roller and providing a difference in pressing pressure between a lower stream side tension roller and an upper stream side tension roller. CONSTITUTION:A document 5 sent in is caught between an upper stream side driving roller 1 and an upper stream side tension roller 3, entered into a reader, and passed through the reading position a by an optical system 9. The document 5 further sent is caught between the upper stream side driving roller 1 and the upper stream side tension roller 3 and between a lower stream side driving roller 2 and a lower side tension roller 4 simultaneously. In this case, the document 5 is stretched between these driving rollers 1 and 2 by the difference in carrying speed between the driving rollers 1, 2, and pressed to a reading plate 8. Further the document 5 carried simultaneously by these driving rollers 1, 2 is slipped between the lower side driving roller 2 and the lower side tension roller by the difference in pressing pressure between the tension rollers 3 and 4, and carried synchronously with the upper stream side driving roller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper sheet conveying device for conveying forms and the like in a reading section of an optical character reading device or the like.

[Conventional technology]

The document conveying device in the reading section of a conventional optical character reading device reads characters while conveying the document using drive rollers installed before and after the reading position and a tension roller that faces the drive rollers. was. Further, the document conveyance speeds of the drive rollers before and after the reading position were set to be the same.

[Problem to be solved by the invention]

However, in the above-described conventional paper sheet conveyance device, a difference in conveyance speed may occur between the drive rollers before and after the reading position due to manufacturing errors. If the conveyance speed of the drive roller on the downstream side of the document conveyance route is slow, the document may wrinkle, bulge, or the like in the reading section. If this phenomenon occurs,
Since the surface of the form enters inside the reading position set by the optical system, it becomes out of focus, causing a reduction in the reading rate.

Even if there is no difference in the conveyance speed of the drive rollers, if the form has wrinkles, the reading rate will decrease as in the case described above.

[Means to solve the problem]

The paper sheet conveying device of the present invention includes an upstream drive roller and a downstream drive roller provided upstream and downstream of a reading section of an optical character reading device, and the upstream drive roller and downstream drive roller, respectively. an upstream tension roller and a downstream tension roller that are pressed against each other, the paper sheets are sandwiched between the upstream drive roller and the upstream tension roller, and then sandwiched between the downstream drive roller and the downstream tension roller, and then In the conveying device for conveying paper sheets from the upstream side to the downstream side after passing through the reading section, the conveyance speed of the paper sheets by the downstream drive roller is higher than the conveyance speed of the paper sheets by the upstream drive roller. and a difference is provided between the pressing pressure of the upstream tension roller and the pressing pressure of the downstream tension roller.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a front view of one embodiment of the present invention.

The upstream drive roller 1 and the downstream drive roller 2 are driven by a motor 6 via a drive belt 7.

The peripheral speed of the upstream drive roller 1, that is, the conveyance speed of the form 5, is set to be approximately 1% slower than that of the downstream drive roller 2.

The upstream tension roller 3 is pressed against the upstream drive roller 1 with a pressure F1. Downstream tension roller 4
is pressed against the downstream drive roller 2 with a pressure F2.

The pressing pressure F2 of the downstream tension roller is set to about 50% of the pressing pressure F of the upstream tension roller.

The form 5 sent from the upstream conveyance path is sandwiched between the upstream drive roller 1 and the upstream tension roller 3, enters the reading section, and is passed through the reading position a by the optical system 9. Further, the sent form 5 is simultaneously sandwiched between the upstream drive roller 1 and the upstream tension roller 3, and between the downstream drive roller 2 and the downstream tension roller 4. At this time, the form 5 is pulled between the upstream drive roller 1 and the downstream drive roller 2 due to the difference in conveyance speed between the upstream drive roller 1 and the downstream drive roller 2, and is pressed against the leading plate 8.

The form 5 that is simultaneously conveyed by the upstream drive roller 1 and the downstream drive roller 2 slips between it and the downstream drive roller 2 because the pressing pressure of the downstream tension roller 4 is smaller than that of the upstream tension roller 3. and is transported in synchronization with the transport speed of the upstream drive roller 1.

〔Effect of the invention〕

As explained above, the present invention makes the conveying speed of the downstream drive roller faster than that of the upstream drive roller, and further provides a difference between the pressing pressure of the downstream tension roller and the pressing pressure of the upstream tension roller. This has the effect of preventing a decrease in the reading rate even if there are manufacturing errors in the rollers or wrinkles in the form.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Upstream drive roller, 2... Downstream drive roller, 3... Upstream tension roller, 4... Downstream tension roller, 5... Form, 6... Motor, 7...
... Drive belt, 8...' Leading plate, a
...Reading position, F, ...Upstream tension roller pressure, F2...Downstream tension roller pressure.

Claims (1)

[Claims] An upstream drive roller and a downstream drive roller provided on the upstream and downstream sides of a reading section of an optical character reading device, and an upstream tension roller and a downstream tension that are pressed against the upstream drive roller and downstream drive roller, respectively. rollers, the sheet is sandwiched between the upstream drive roller and the upstream tension roller, and then passed between the downstream drive roller and the downstream tension roller and passed through the reading section from the upstream side. In the conveying device for conveying paper sheets to the downstream side, the conveyance speed of the paper sheets by the downstream drive roller is set higher than the conveyance speed of the paper sheets by the upstream drive roller, and the pressing pressure of the upstream tension roller is increased. and a paper sheet conveyance device, characterized in that a difference is provided in the pressing pressure of the downstream tension roller.