Patent US5408304A successfully refreshed from Google Patents.
US5408304A
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Image forming apparatus having a pre-paper-feed function
Assignee: Canon Inc
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Filing: 1992-03-11
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Granted: 1995-04-18
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Expires: 2012-03-11
Abstract
Abstract In an image forming apparatus having a pre-paper-feed function to previously convey a paper to a predetermined position before a print request, after a device for generating a pre-paper-feed requests has generated the pre-paper-feed request, the pre-paper-feed request can be made invalid.
Inventors
- 👤 Yoji Serizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:44
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/16; G03; G03G; G03G15/00; G03G15/65; G03G15/6555; G03G15/6558; G03G15/6561; G03G15/6564; G03G2215/00; G03G2215/00362; G03G2215/00535; G03G2215/00556; G03G2215/00717; G03G2215/00721
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
90 words
An image forming apparatus comprising: means for receiving, prior to a print request signal and from an image data source, a predetermined signal instructing said apparatus to feed a sheet to a predetermined position; means for receiving the print request signal; means for forming an image on the sheet fed from the predetermined position in response to the print request signal; and means for outputting an identifying signal identifying a time after which the predetermined signal instructing the apparatus to feed the sheet to the predetermined position cannot be cancelled.
Claim 2
Dependent Claim
90 words
An image forming apparatus comprising: means for receiving, prior to a print request signal and from an image data source, a predetermined signal instructing said apparatus to feed a sheet to a predetermined position; means for receiving the print request signal; means for forming an image on the sheet fed from the predetermined position in response to the print request signal; and means for outputting an identifying signal identifying a time after which the predetermined signal instructing the apparatus to feed the sheet to the predetermined position cannot be cancelled.
Claim 3
Dependent Claim
44 words
An image forming apparatus according to claim 1, wherein said apparatus is capable of feeding the sheet to the predetermined position for image formation on a next page in response to the predetermined signal, prior to completion of image formation on a current page.
Claim 4
Dependent Claim
28 words
An image forming apparatus according to claim 1, wherein said predetermined signal is a continuous signal to be maintained until at least a print request signal is outputted.
Claim 5
Dependent Claim
37 words
An image forming apparatus according to claim 3, wherein when the maintained state of said predetermined signal is released at a time when the predetermined signal is cancelable, said apparatus cancels the instruction of the predetermined signal.
Claim 6
Dependent Claim
33 words
An image forming apparatus according to claim 1, wherein said predetermined signal is a strobe signal in the form of a pulse and said apparatus further comprises means for storing said predetermined signal.
Claim 7
Dependent Claim
56 words
An image forming apparatus according to claim 5, further comprising means for receiving a predetermined command sent from the image data source and for cancelling the instruction from the predetermined signal, wherein when the predetermined command is received at a time when the predetermined signal is cancelable, said apparatus cancels the instruction of the predetermined signal.
Claim 8
Dependent Claim
31 words
An image forming apparatus according to claim 1, wherein said apparatus outputs statuses of said apparatus to the image data source and outputs said identifying signal as one of the statuses.
Claim 9
Dependent Claim
28 words
An image forming apparatus according to claim 1, wherein said predetermined signal is sent via a signal line different from signal lines used for transmission of other signals.
Claim 10
Dependent Claim
26 words
An image forming apparatus according to claim 1, wherein said predetermined signal is sent via a signal line used for transmission of a vertical sync signal.
Claim 11
Dependent Claim
14 words
An image forming apparatus according to claim 1, further comprising the image data source.
Claim 12
Dependent Claim
21 words
An image forming apparatus according to claim 1, wherein said image forming means forms the image by an electrostatic recording system.
Claim 13
Dependent Claim
38 words
An image forming apparatus according to claim 1, further comprising means for reserving a plurality of sheets, wherein said apparatus feeds a sheet from said reserving means to the predetermined position on the basis of the predetermined signal.
Claim 14
Dependent Claim
37 words
An image forming apparatus according to claim 12, wherein when the print request signal is received without receiving the predetermined signal, said apparatus feeds a sheet from said reserving means in response to the print request signal.
Claim 15
Dependent Claim
20 words
An image forming apparatus according to claim 1, wherein said predetermined position is a stop position at a registration roller.
Claim 16
Dependent Claim
14 words
An image forming apparatus according to claim 1, further comprising the image data source.
Claim 17
Dependent Claim
52 words
An image forming apparatus according to claim 15, wherein said image forming apparatus cancels the instruction of the predetermined signal by stopping the sending of the predetermined signal when the image forming apparatus is set into an off-line state at the identified time, after said image data source outputs the predetermined signal.
Claim 18
Dependent Claim
26 words
An image forming apparatus according to claim 15, wherein the image data source converts code data sent from an external host computer into bit map data.
Claim 19
Dependent Claim
50 words
An image forming apparatus according to claim 17, wherein said image forming apparatus cancels the predetermined signal by stopping the sending of the predetermined signal when a print cancel command is received from the external host computer at the identified time, after said image data source outputs the predetermined signal.
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) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |