Patent US4900173A successfully refreshed from Google Patents.
US4900173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for feeding sheet
Assignee: Canon Inc
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Filing: 1989-02-02
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Granted: 1990-02-13
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Expires: 2009-02-02
Abstract
Abstract A sheet feeding apparatus for feeding a sheet to a recording station by means of rollers, comprising an automatic OHP sheet feeder, wherein the fact whether a sheet being fed is an OHP sheet or a separating sheet is discriminated; if the sheet is the OHP sheet, the sheet is advanced by a predetermined amount, and is retracted by a predetermined amount into a waiting passage; then, another sheet is supplied and the fact that the another sheet is a separating sheet is confirmed; and thereafter, images or characters are recorded on the OHP sheet, while feeding the OHP sheet and the separating sheet altogether in an overlapped condition.
Inventors
- 👤 Shigeru Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:06
CPC Classifications
B; B41; B41J; B41J13/00; B41J13/009; B41J13/0054
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
A method for feeding a sheet in a sheet feeding apparatus used with a recording system, comprising the steps of: discriminating whether a sheet being fed is a transparent plastic sheet or not; when said sheet is the transparent plastic sheet, advancing said sheet by a predetermined amount, and then retracting said sheet by a predetermined amount into a waiting passage; supplying a plain sheet; and recording images or characters on said transparent plastic sheet, while feeding said transparent plastic sheet and said plain sheet altogether in an overlapped condition.
Claim 2
Independent Claim
90 words
A method for feeding a sheet in a sheet feeding apparatus used with a recording system, comprising the steps of: discriminating whether a sheet being fed is a transparent plastic sheet or not; when said sheet is the transparent plastic sheet, advancing said sheet by a predetermined amount, and then retracting said sheet by a predetermined amount into a waiting passage; supplying a plain sheet; and recording images or characters on said transparent plastic sheet, while feeding said transparent plastic sheet and said plain sheet altogether in an overlapped condition.
Claim 3
Dependent Claim
17 words
A sheet feeding method according to claim 1, wherein said transparent plastic sheet comprises an OHP sheet.
Claim 4
Dependent Claim
21 words
A sheet feeding method according to claim 1, wherein said transparent plastic sheet is supplied from a manual feeding inlet means.
Claim 5
Dependent Claim
138 words
A sheet feeding apparatus comprising: a sheet feeding path for conveying a sheet; a waiting passage situated out of said sheet feeding path; discriminating means for discriminating whether a sheet supplied to said sheet feeding path is a transparent plastic sheet or not; distribution means for selectively distributing said supplied sheet to either said sheet feeding path or said waiting passage when said supplied sheet is retracted, the selective distribution by said distribution means being determined in accordance with a result of the discrimination due to said discriminating means; and control means for advancing said supplied sheet by a predetermined amount and then retracting said sheet into either said sheet feeding path or said waiting passage through said distribution means and then supplying another sheet and advancing said sheet and said another sheet altogether in an overlapped condition.
Claim 6
Dependent Claim
138 words
A sheet feeding apparatus comprising: a sheet feeding path for conveying a sheet; a waiting passage situated out of said sheet feeding path; discriminating means for discriminating whether a sheet supplied to said sheet feeding path is a transparent plastic sheet or not; distribution means for selectively distributing said supplied sheet to either said sheet feeding path or said waiting passage when said supplied sheet is retracted, the selective distribution by said distribution means being determined in accordance with a result of the discrimination due to said discriminating means; and control means for advancing said supplied sheet by a predetermined amount and then retracting said sheet into either said sheet feeding path or said waiting passage through said distribution means and then supplying another sheet and advancing said sheet and said another sheet altogether in an overlapped condition.
Claim 7
Dependent Claim
17 words
A sheet feeding apparatus according to claim 4, wherein said transparent plastic sheet is an OHP sheet.
Claim 8
Dependent Claim
48 words
A sheet feeding apparatus according to claim 5, further comprising an automatic OHP sheet feeder including a sheet stack constituted by the OHP sheets and separating sheets laminated alternately, and wherein said sheet supplied to said sheet feeding path is either the OHP sheet or the separating sheet.
Claim 9
Dependent Claim
55 words
A sheet feeding apparatus according to claim 6, wherein said discriminating means operates for driving said distribution means to guide said OHP sheet into said waiting passage when the OHP sheet is confirmed, and for driving said distribution means to guide said separating sheet into said sheet feeding path when the separating sheet is confirmed.
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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |