US4769673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image scanning apparatus
Assignee: Canon Inc
•
Filing: 1984-09-26
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Granted: 1988-09-06
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Expires: 2004-09-26
Abstract
Abstract An image scanning apparatus has a reciprocating member for scanning a document, a first motor for driving the reciprocating member, a first detection circuit for detecting the speed of the first motor, a first control circuit associated with the detection circuit for rotating the motor at a speed to scan the document at a speed determined by a magnification factor, a recording medium, a second motor for driving the recording medium, a second detection circuit for detecting the speed of the second motor and a second control circuit associated with the second detection circuit for rotating the second motor at a speed determined by the magnification factor.
Inventors
- 👤 Masahiro Tomosada
- 👤 Katsuyoshi Maeshima
- 👤 Tsuneki Inuzuka
- 👤 Hisashi Sakamaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:20
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/041
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
A copying machine comprising: means for scanning a document; a first drive source for driving said scanning means; means for entering a magnification factor of a reproduced image of said document, said entering means including key means for instructing a magnification factor; first detection means for detecting a speed of said first drive source;
Claim 2
Dependent Claim
54 words
A copying machine comprising: means for scanning a document; a first drive source for driving said scanning means; means for entering a magnification factor of a reproduced image of said document, said entering means including key means for instructing a magnification factor; first detection means for detecting a speed of said first drive source;
Claim 3
Dependent Claim
114 words
first control means associated with said first detection means for controlling a speed of said first drive source in accordance with the magnification factor entered by said entering means, said first control means including a micro computer which inputs a binary signal from said entering means; a recording medium for recording a reproduced image corresponding to the document scanned by said scanning means; a second drive source for driving said recording medium; second detection means for detecting a speed of said second drive source; and second control means associated with said second detection means, for controlling a speed of said second drive source in accordance with the magnification factor entered by said entering means.
Claim 4
Dependent Claim
114 words
first control means associated with said first detection means for controlling a speed of said first drive source in accordance with the magnification factor entered by said entering means, said first control means including a micro computer which inputs a binary signal from said entering means; a recording medium for recording a reproduced image corresponding to the document scanned by said scanning means; a second drive source for driving said recording medium; second detection means for detecting a speed of said second drive source; and second control means associated with said second detection means, for controlling a speed of said second drive source in accordance with the magnification factor entered by said entering means.
Claim 5
Dependent Claim
21 words
A copying machine according to claim 1 wherein said scanning means is returned by the reversal of said first drive source.
Claim 6
Dependent Claim
27 words
A copying machine according to claim 1 wherein frequencies of basic pulses for said first drive source and said second drive source are different from each other.
Claim 7
Dependent Claim
15 words
A copying machine according to claim 1, wherein said recording medium is a photosensitive drum.
Claim 8
Dependent Claim
182 words
A document scanning apparatus comprising: reciprocating means for scanning a document; a drive source for driving said reciprocating means; pulse generating means associated with said drive source; means for controlling said drive source in response to the pulses from said pulse generating means to move said reciprocating means at a predetermined speed; and means for detecting an abnormality in the pulses from said pulse generating means to produce an error signal; wherein said abornmality detecting means is capable of detecting an abnormality in the pulses in a first mode and in a second mode; wherein said abnormality detecting means includes first timer means for counting a first predetermined time period and generates said error signal to stop said apparatus if said pulses are not generating while said first timer means counts said first predetermined timer period; and wherein said abnormality detecting means includes second timer means for counting a second predetermined time period and generates said error signal to stop said apparatus if said pulses are generated when said second timer means counts said second predetermined time period, in said second mode.
Claim 9
Dependent Claim
182 words
A document scanning apparatus comprising: reciprocating means for scanning a document; a drive source for driving said reciprocating means; pulse generating means associated with said drive source; means for controlling said drive source in response to the pulses from said pulse generating means to move said reciprocating means at a predetermined speed; and means for detecting an abnormality in the pulses from said pulse generating means to produce an error signal; wherein said abornmality detecting means is capable of detecting an abnormality in the pulses in a first mode and in a second mode; wherein said abnormality detecting means includes first timer means for counting a first predetermined time period and generates said error signal to stop said apparatus if said pulses are not generating while said first timer means counts said first predetermined timer period; and wherein said abnormality detecting means includes second timer means for counting a second predetermined time period and generates said error signal to stop said apparatus if said pulses are generated when said second timer means counts said second predetermined time period, in said second mode.
Claim 10
Dependent Claim
43 words
An apparatus according to claim 5, wherein said pulse generating means includes means for detecting a speed of said drive source, and wherein said control means controls said drive source at a desired speed in accordance with the pulses from said detecting means.
Claim 11
Dependent Claim
57 words
An apparatus according to claim 6, further comprising means for entering a magnification factor of a reproduced image of said document, wherein said control means controls said drive source in accordance with the pulses from said detecting means to scan said document at a desired speed in response to the magnification factor entered from said entering means.
Claim 12
Dependent Claim
49 words
An apparatus according to claim 7, further comprising a second control means for controlling said drive source to return said reciprocating means after the completion of the scan of said document, wherein said second control means provides a predetermined output to said drive source independently from said detecting means.
Claim 13
Dependent Claim
29 words
An apparatus according to claim 7, wherein said abnormality detecting means sets a value corresponding to the entered magnification factor in said first timer means and second timer means.
References Cited (Backward Citations)
US3351831A
Cited
US4421402A
Cited
US4080062A
Cited
US4431299A
Cited
US4456366A
Cited
US4243311A
Cited
US4211482A
Cited
US4372673A
Cited
US4218735A
Cited
US4310241A
Cited
US4461565A
Cited
US4332462A
Cited
US4421403A
Cited
US4379631A
Cited
US4453824A
Cited
US4387983A
Cited
US4383753A
Cited
US4332461A
Cited
US4287461A
Cited
US4415259A
Cited
US4441804A
Cited
US4327994A
Cited
US4364658A
Cited
US4413900A
Cited
US4391506A
Cited
US4426149A
Cited
US4436416A
Cited
US4366219A
Cited
US4457616A
Cited
US4432633A
Cited
US4441805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |