US4947217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus with control mechanism to correct any abberation in stopping position of original document
Assignee: Canon Inc
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Filing: 1988-10-21
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Granted: 1990-08-07
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Expires: 2008-10-21
Abstract
Abstract There is disclosed an image forming apparatus with a document handling device. In order to prevent eventual aberration in the stopping position of the document, the apparatus of the present invention measures the amount of abberation in the stopping position of the document and accordingly controls the image forming position.
Inventors
- 👤 Koichi Murakami
- 👤 Takeshi Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/60; G03G15/65; G03G15/6555; G03G15/6558; G03G15/6561; G03G15/6564; G03G2215/00; G03G2215/00172; G03G2215/00177; G03G2215/00181; G03G2215/00185; G03G2215/00362; G03G2215/00367; G03G2215/00405; G03G2215/00409; G03G2215/00535; G03G2215/00556; G03G2215/00599
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
An image forming apparatus comprising: original document feeder means for feeding an original document to a predetermined position and for stopping the same thereat; signal generator means for generating pulse signals periodically in synchronism with the feeding of the original document; counter means for counting the number of pulse signals generated from said signal generator means during a period of time from occurrence of an instruction for an operation stop of said original document feeder means to an actual operation stop thereof; image forming means for forming an image of the original document on a recording material; and control means for controlling said image forming means in accordance with a counting value of said counter means so as to control the position of the image to be formed on said recording material.
Claim 2
Dependent Claim
132 words
An image forming apparatus comprising: original document feeder means for feeding an original document to a predetermined position and for stopping the same thereat; signal generator means for generating pulse signals periodically in synchronism with the feeding of the original document; counter means for counting the number of pulse signals generated from said signal generator means during a period of time from occurrence of an instruction for an operation stop of said original document feeder means to an actual operation stop thereof; image forming means for forming an image of the original document on a recording material; and control means for controlling said image forming means in accordance with a counting value of said counter means so as to control the position of the image to be formed on said recording material.
Claim 3
Dependent Claim
34 words
An image forming apparatus according to claim 1, wherein said control means is adapted to control the timing of feeding of said recording material in accordance with the counting value of said counter means.
Claim 4
Dependent Claim
62 words
An image forming apparatus according to claim 2, wherein said image forming means is adapted to form an electrostatic latent image on a photosensitive member, then developing said latent image and transferring thus developed image onto the recording material, and said control means is adapted to control the timing of registration between the image on said photosensitive member and the recording material.
Claim 5
Dependent Claim
54 words
An image forming apparatus according to claim 3, wherein said image forming means comprises signal generator means for generating pulse signals periodically in synchronization with the rotation of said photosensitive member, and said control means is adapted to control said timing of registration based on the pulse signals generated by said signal generator means.
Claim 6
Dependent Claim
152 words
An image forming apparatus comprising: designating means for designating a desired area on an original document; original document feeder means for feeding the original document to a predetermined position and for stopping the same thereat; signal generator means for generating pulse signals periodically in synchronism with the feeding of the original document; counter means for counting the number of pulse signals generated from said signal generator means during a period of time for occurrence of an instruction for an operation stop of said original document feeder means to an actual operation stop thereof; image forming means for forming on a recording material an image of the original document according to the area designated by said designating means; and control means for controlling said image forming means in accordance with a counting value of said counter means so as to control the position of the image to be formed on said recording material.
Claim 7
Dependent Claim
152 words
An image forming apparatus comprising: designating means for designating a desired area on an original document; original document feeder means for feeding the original document to a predetermined position and for stopping the same thereat; signal generator means for generating pulse signals periodically in synchronism with the feeding of the original document; counter means for counting the number of pulse signals generated from said signal generator means during a period of time for occurrence of an instruction for an operation stop of said original document feeder means to an actual operation stop thereof; image forming means for forming on a recording material an image of the original document according to the area designated by said designating means; and control means for controlling said image forming means in accordance with a counting value of said counter means so as to control the position of the image to be formed on said recording material.
Claim 8
Dependent Claim
34 words
An image forming apparatus according to claim 5, wherein said control means is adapted to control the timing of feeding of said recording material in accordance with the counting value of said counter means.
Claim 9
Dependent Claim
62 words
An image forming apparatus according to claim 6, wherein said image forming means is adapted to form an electrostatic latent image on a photosensitive member, then developing said latent image and transferring thus developed image onto the recording material, and said control means is adapted to control the timing of registration between the image on said photosensitive member and the recording material.
Claim 10
Dependent Claim
54 words
An image forming apparatus according to claim 7, wherein said image forming means comprises signal generator means for generating pulse signals periodically in synchronization with the rotation of said photosensitive member, and said control means is adapted to control said timing of registration based on the pulse signals generated by said signal generator means.
Claim 11
Dependent Claim
23 words
An image forming apparatus according to claim 5, wherein said designating means is provided on the upper part of said original feeder means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |