US4190246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper feeding system
Assignee: Xerox Ltd
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Filing: 1978-01-17
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Granted: 1980-02-26
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Expires: 1998-01-17
Abstract
Abstract A selector circuit for use with a paper tray in a copy machine to determine the sizes of paper stored in the paper trays, compare the available sizes with the operator-selected size and enable the proper paper tray feed mechanisms to assure feeding the desired size paper.
Inventors
- 👤 Kazuyasu Sasuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:41
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6502; G03G15/6508; B; B65; B65H; B65H1/00; G03G2215/00; G03G2215/00362; G03G2215/00367; G03G2215/00379; G03G2215/00383; G03G2215/00535; G03G2215/00556; G03G2215/00603
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
In a paper feeder for use in a copying machine equipped with a plurality of trays for storing paper of various sizes; the improvement comprising: a circuit for encoding a selected paper size from a number of available paper sizes; circuit means for detecting and encoding the sizes of paper stored in the plurality of trays; a comparator circuit for comparing said selected paper size with one of the plurality of trays that contains paper corresponding to the selected paper size; and a dual discriminator circuit for generating signals in response to the output of said comparator circuit, said discriminator circuit in a first mode enables paper feeding from a selected tray if paper is available for feeding and in a second mode generates a signal to indicate necessity of adding paper to the selected tray if the tray is empty.
Claim 2
Dependent Claim
141 words
In a paper feeder for use in a copying machine equipped with a plurality of trays for storing paper of various sizes; the improvement comprising: a circuit for encoding a selected paper size from a number of available paper sizes; circuit means for detecting and encoding the sizes of paper stored in the plurality of trays; a comparator circuit for comparing said selected paper size with one of the plurality of trays that contains paper corresponding to the selected paper size; and a dual discriminator circuit for generating signals in response to the output of said comparator circuit, said discriminator circuit in a first mode enables paper feeding from a selected tray if paper is available for feeding and in a second mode generates a signal to indicate necessity of adding paper to the selected tray if the tray is empty.
References Cited (Backward Citations)
US3622238A
Cited
US3977666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |