Patent US5289247A successfully refreshed from Google Patents.
US5289247A
Expired / Lapsed
US
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Image forming apparatus with changeable feed interval for continuous feed
Assignee: Canon Inc
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Filing: 1992-06-25
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Granted: 1994-02-22
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Expires: 2012-06-25
Abstract
Abstract A feed interval of continuous feeding is changed according to the set temperature of a heating member or the size of a recording material, or a feed interval is long for a predetermined time after a state for forming an image is established and is then decreased after the predetermined time has passed, thereby causing a slight increase in the temperature of the non-passage portion.
Inventors
- 👤 Manabu Takano
- 👤 Masahiro Goto
- 👤 Koichi Suwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/2042; G03G15/2046; G03G2215/00; G03G2215/00362; G03G2215/00535; G03G2215/00556; G03G2215/00599
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
An image forming apparatus comprising: means for fixing an unfixed image on a recording material, said fixing means comprising a heating member selectively maintainable at one of at least a first set temperature and a second set temperature lower than the first set temperature during fixing, and a backup member forming a nip with said heating member so that said nip conveys a recording material holding an unfixed image thereon through said nip to fix the unfixed image; feed means for continuously feeding recording materials on which there is an unfixed image to said fixing means; and feed interval control means for switching between a first feed interval at the first set temperature and a second feed interval shorter than the first feed interval at the second set temperature during continuous feeding of the recording materials.
Claim 2
Dependent Claim
136 words
An image forming apparatus comprising: means for fixing an unfixed image on a recording material, said fixing means comprising a heating member selectively maintainable at one of at least a first set temperature and a second set temperature lower than the first set temperature during fixing, and a backup member forming a nip with said heating member so that said nip conveys a recording material holding an unfixed image thereon through said nip to fix the unfixed image; feed means for continuously feeding recording materials on which there is an unfixed image to said fixing means; and feed interval control means for switching between a first feed interval at the first set temperature and a second feed interval shorter than the first feed interval at the second set temperature during continuous feeding of the recording materials.
Claim 3
Dependent Claim
26 words
An apparatus according to claim 1, wherein said heating member comprises a heating roller heated by a heater and supported by bearings made of a resin.
Claim 4
Dependent Claim
39 words
An apparatus according to claim 1, wherein said fixing means further comprises a temperature detection element for detecting the surface temperature of said heating member, said temperature detection element being provided within a passage region of a recording material.
Claim 5
Dependent Claim
22 words
An apparatus according to claim 3, wherein said temperature detection element is provided adjacent a reference position for passage of recording materials.
Claim 6
Dependent Claim
45 words
An apparatus according to claim 1, wherein said fixing means maintains the temperature of said heating member so that said first set temperature is higher than said second set temperature for a predetermined time after a power source of the apparatus body is turned on.
Claim 7
Dependent Claim
142 words
An image forming apparatus comprising: a heating member for fixing; temperature control means for maintaining said heating member at a predetermined set temperature during fixing; a backup member forming a nip with said heating member to convey a recording material holding an unfixed image through said nip to fix the unfixed image; feed means for continuously feeding recording materials at intervals to said nip for fixing an unfixed image on each of said recording materials; size detection means for detecting a size of the recording material; and feed interval control means for controlling the feed interval of said recording materials on the basis of the results of detection by said size detection means; wherein said feed interval control means makes the feed interval longer when said size detection means detects that a recording material has a small passage region in said nip.
Claim 8
Dependent Claim
142 words
An image forming apparatus comprising: a heating member for fixing; temperature control means for maintaining said heating member at a predetermined set temperature during fixing; a backup member forming a nip with said heating member to convey a recording material holding an unfixed image through said nip to fix the unfixed image; feed means for continuously feeding recording materials at intervals to said nip for fixing an unfixed image on each of said recording materials; size detection means for detecting a size of the recording material; and feed interval control means for controlling the feed interval of said recording materials on the basis of the results of detection by said size detection means; wherein said feed interval control means makes the feed interval longer when said size detection means detects that a recording material has a small passage region in said nip.
Claim 9
Dependent Claim
26 words
An apparatus according to claim 6, wherein said heating member comprises a heating roller heated by a heater and supported by bearings made of a resin.
Claim 10
Dependent Claim
40 words
An apparatus according to claim 6, wherein said temperature control means further comprises a temperature detection element for detecting the surface temperature of said heating member, said temperature detection element being provided within a passage region of a recording material.
Claim 11
Dependent Claim
22 words
An apparatus according to claim 8, wherein said temperature detection element is provided adjacent a reference position for passage of recording materials.
Claim 12
Dependent Claim
15 words
An apparatus according to claim 6, wherein a smaller size recording material is an envelope.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |