Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1994-03-07
1995-09-26
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Picture signal generator
271121, 271124, 271137, 271138, H04N 100, B65H 352
Patent
active
054538521
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an image reading apparatus such as a facsimile or image scanner and is further directed to the improvement of the components of such an image reading apparatus.
BACKGROUND ART
A brief explanation will be made first, referring to FIG. 41, of the general configuration of an image reading apparatus (including both the one-side and two-side reading types) in which media having information to be read (below, referred to as documents or paper) are stacked on a hopper and are sequentially taken out from the lowermost document (bottom take-out type) and the information of the document is optically read (two-side reading type).
In the figure, the documents 1 stacked on a document hopper 3 are sequentially taken out from the lowermost document by the coaction of a paper feed roller 5 and a document separation pad elastically pressed against the same. Thereafter, the documents 1 are sent to a paper eject roller 13 via feed rollers 9 and 11 while being guided by paper guides (document stands) 17 and 19 and are ejected from there to the outside and stacked on a stacker 15. During this feeding operation, the information of the document is read by a first optical reading unit 21A and a second optical reading unit 21B. In the illustrated conventional example, the first optical reading unit 21A is arranged beneath a document passage 23 and reads the information (image) on a lower surface of the document, while the second optical reading unit 21B is arranged above the document passage 23 and reads the information (image) on the upper surface of the document. Note that, the first optical reading unit 21A and second optical reading unit 21B are constituted by light source lamps 25a and 25b; first and second reflection mirrors 27a, 29a and 27b, 29b; imaging lenses 31a and 31b; and one-directional image sensors 33a and 33b.
FIG. 42 shows the general configuration of a single reading unit type image reading apparatus which reads both surfaces of the document by inverting the same.
In the figure, parts corresponding to those in FIG. 41 are given the same numerals, and an explanation thereof will be omitted. Note that, in FIG. 42, the document 1 is shown supplied from the left side of the figure reverse to FIG. 41. The document 1 is sent in the right direction in the figure by a feed belt 41, and initially the image of the lower surface is read by the single reading unit 21. Note that, the reading unit 21 is moveable along the document stand 17, which performs a sub-scanning (in a direction orthogonal to a beam scanning direction, that is, the scanning of the document feeding direction). This sub-scanning is exactly the same in the case of FIG. 41 as well.
The document whose lower surface has been read is drawn in a direction A of the figure (left direction) by the feed belt 41. Before the rear edge is separated from reversing rollers 43, the feed belt 41 is reversed to pass the document between the reversing rollers 43, draw it in a direction B, and drop it on the reversing stand 45. Thereafter, the reversing rollers 43 are reversed and the document 1 is supplied onto the document stand 17 by coaction with the feed belt 41. At this time, the front and back of the document 1 are inverted from those at the first reading, and accordingly the image of the other surface (initial upper surface) can be read. After the completion of the reading operation, the feed belt 41 is reversed again, and the document 1 is fed rightward in the figure and stacked on the stacker 15. Note that, at this time, the passage switching lever 47 is opened to a position 47'. Although not particularly illustrated, if necessary, the passage switching lever is appropriately provided also at the portion of the reversing rollers 43.
There has been a rapid reduction of size and lowering of price of the main body of data processing apparatuses. Along with this, the reduction of size and lowering of price of the peripherals have been demanded. The image reading apparatuses are no exceptions. There was a problem in
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Futatsuka Masahiko
Ishida Satoshi
Masuda Minoru
Miyauchi Yasunori
Morikawa Shuichi
Fujitsu Limited
PFU Limited
Rogers Scott A.
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