Image forming system

a technology of image forming and forming system, which is applied in the direction of transportation and packaging, thin material processing, article separation, etc., can solve the problems of image defect (irregularities across the sheet feed direction), complicated mechanism, and prone to production, so as to avoid adverse effects and high-quality images

Inactive Publication Date: 2005-07-28
KONICA MINOLTA MEDICAL & GRAPHICS INC
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0012] In view of the prior art problems described above, it is an object of the present invention to provide an image recording apparatus capable of avoiding an adverse...

Problems solved by technology

It is well known that an image defect (irregularities across the sheet feed direction) tends to be produced by the flapping of the sheet or irregular rotation of the drive system, when the leading edge of the sheet enters the second nip roller located downstream and the tailing edge of the sheet gets out of the upstream first nip roller, according to this method.
However, when the detached roller contacts the sheet, irregularities still tend to occur.
However, this method involves a complicated mechanism for rotating and rocking the roller (concurrent revolving and rotating).
And because of using heavy weight and large inertia rollers, this method is not sufficie...

Method used

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embodiment 1

[0071] The following gives more specific description of the present invention with reference to the first embodiment. The weight of the driven roller 182 of the second conveyance roller pair 180 in FIGS. 3 and 5 was changed to 100, 200, 300, 400 and 540 gf in that order, and the spring constant was changed, thereby adjusting the balance of the energizing force between the biasing member 58 and the biasing member 64. The gap amount of the nip gap 183 of FIG. 6 was changed to 100, 125, 150 and 190 μm in that order. Then the image was recorded and the disturbed image (irregularities in the image) at the time of entry of the film leading edge were observed, thereby evaluating the image quality. FIG. 8 shows the result of this experiment. In the image quality evaluation in FIG. 8, the image is not affected by irregularities at the time of film entry, if the evaluation score is “Excellent” (almost no disturbed image at the time of film entry) or better.

[0072] In the first embodiment, the...

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Abstract

An image recording apparatus for recording an image on a sheet by a main scanning with a laser beam and a sub-scanning of the sheet, the image recording apparatus having: a pair of upstream rollers, arranged upstream of an exposing position of the laser beam; a pair of downstream rollers, wherein the sub-scanning is conducted by nipping and conveying the sheet with the pairs of upstream rollers and downstream rollers; wherein the pair of downstream rollers includes: a first roller driven by a drive section; a second roller, having a total weight of 300 g or less, wherein a gap amount of a nip between the first and the second rollers is set smaller than a thickness of the sheet; and a roller holding section for holding both ends of the second roller so as to be capable of driven rotation.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to an image recording apparatus for recording an image wherein a sheet-like object to be scanned is conveyed while being sandwiched between a pair of rollers. [0002] Patent Document 1 discloses a method for recording an image on the whole surface of a sheet as a recording medium by conveying it with two sets of nip rollers. It is well known that an image defect (irregularities across the sheet feed direction) tends to be produced by the flapping of the sheet or irregular rotation of the drive system, when the leading edge of the sheet enters the second nip roller located downstream and the tailing edge of the sheet gets out of the upstream first nip roller, according to this method. To solve the problem caused when the tailing edge of the sheet gets out of the upstream first nip roller, it is a common practice to release the first nip roller before the sheet gets out of the roll, as described in the Patent Document 2. ...

Claims

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Application Information

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IPC IPC(8): B65H5/00B65H5/06
CPCB65H5/062B65H2301/44318B65H2404/1316B65H2404/1451B65H2404/144B65H2404/1441B65H2404/1421
Inventor SUMI, MAKOTO
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
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