US4834568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper feeding apparatus for printer
Assignee: Brother Industries Ltd
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Filing: 1988-01-21
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Granted: 1989-05-30
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Expires: 2008-01-21
Abstract
Abstract A paper feeding apparatus for a printer comprises a control means and a drive mechanism for feeding a sheet of paper to a predetermined printing position on the platen. The control means activates the drive mechanism for a predetermined period until a paper detective sensor near the platen detects a leading edge of the sheet. If the paper detective sensor detects no sheet after the predetermined period, a control means repeats the paper feed operation without requiring the operator to give a subsequent driving signal.
Inventors
- 👤 Isao Kagami
- 👤 Makoto Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:48
CPC Classifications
B; B41; B41J; B41J11/00; B41J11/36; B41J11/42; B41J13/00; B41J13/0009; B41J13/0018
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
A sheet-feeding control device for a printer comprising: a printing mechanism including a platen and a printhead opposite said platen for printing on a sheet on said platen; a tray for holding a pile of said sheets thereon; a feed roller provided at an edge portion of said tray to rotate in a forward direction and to contact said sheets on said tray and sequentially feed a top sheet of said sheets to said printing mechanism; a drive mechanism for rotating said feed roller and said platen; detection means opposite said platen for detecting that said sheet has reached a predetermined position of a sheet path between said tray and said printhead and generating a signal representative thereof; a first forward-feeding means for activating said drive mechanism to cause a forward-feeding action of said platen during a predetermined time period and for stopping said forward-feeding action when said detection means sends said detection signal; and a second forward-feeding means for activating said drive mechanism to automatically repeat said forward-feeding action when said detection means sends no detection signal during said predetermined time period of said first forward-feeding means.
Claim 2
Dependent Claim
188 words
A sheet-feeding control device for a printer comprising: a printing mechanism including a platen and a printhead opposite said platen for printing on a sheet on said platen; a tray for holding a pile of said sheets thereon; a feed roller provided at an edge portion of said tray to rotate in a forward direction and to contact said sheets on said tray and sequentially feed a top sheet of said sheets to said printing mechanism; a drive mechanism for rotating said feed roller and said platen; detection means opposite said platen for detecting that said sheet has reached a predetermined position of a sheet path between said tray and said printhead and generating a signal representative thereof; a first forward-feeding means for activating said drive mechanism to cause a forward-feeding action of said platen during a predetermined time period and for stopping said forward-feeding action when said detection means sends said detection signal; and a second forward-feeding means for activating said drive mechanism to automatically repeat said forward-feeding action when said detection means sends no detection signal during said predetermined time period of said first forward-feeding means.
Claim 3
Dependent Claim
47 words
The sheet-feeding control device for the printer according to claim 1, wherein said drive mechanism has gear means that rotates for a predetermined distance during said predetermined time period to feed said sheet, said gear means having a non-driving portion that stops said feed said feeding action.
Claim 4
Dependent Claim
262 words
A sheet-feeding control device for a printer comprising: a printing mechanism including a platen and a printhead opposite said platen for printing on a sheet on said platen; a tray for holding a pile of said sheets thereon; a feed roller provided at an edge portion of said tray to rotate in a forward direction and to contact said sheets on said tray and sequentially feed a top sheet of said sheets to said printing mechanism; a drive mechanism for rotating said feed roller and said platen; detection means opposite said platen for detecting that said sheet has reached a predetermined position of a sheet path between said tray and said printhead and generating a signal representative thereof; an initial forward-feeding means for activating said drive mechanism to cause an initial forward-feeding action of said feed roller and said platen; a first backward-feeding means responsive to said initial forward-feeding means for activating said drive mechanism to cause a backward-feeding action of at least said platen to prevent misfeeding of said sheet; a first forward-feeding means responsive to said first backward-feeding means for activating said drive mechanism to cause a forward-feeding action of said platen; a second forward-feeding means for activating said drive mechanism to automatically repeat said forward-feeding action when said first forward-feeding means completes said forward-feeding action and said detection means sends no detection signal; and a second backward-feeding means responsive to said second forward-feeding means for activating said drive mechanism to automatically repeat said backward-feeding action to prevent misfeeding of said sheet when said detection means sends said detection signal.
Claim 5
Dependent Claim
262 words
A sheet-feeding control device for a printer comprising: a printing mechanism including a platen and a printhead opposite said platen for printing on a sheet on said platen; a tray for holding a pile of said sheets thereon; a feed roller provided at an edge portion of said tray to rotate in a forward direction and to contact said sheets on said tray and sequentially feed a top sheet of said sheets to said printing mechanism; a drive mechanism for rotating said feed roller and said platen; detection means opposite said platen for detecting that said sheet has reached a predetermined position of a sheet path between said tray and said printhead and generating a signal representative thereof; an initial forward-feeding means for activating said drive mechanism to cause an initial forward-feeding action of said feed roller and said platen; a first backward-feeding means responsive to said initial forward-feeding means for activating said drive mechanism to cause a backward-feeding action of at least said platen to prevent misfeeding of said sheet; a first forward-feeding means responsive to said first backward-feeding means for activating said drive mechanism to cause a forward-feeding action of said platen; a second forward-feeding means for activating said drive mechanism to automatically repeat said forward-feeding action when said first forward-feeding means completes said forward-feeding action and said detection means sends no detection signal; and a second backward-feeding means responsive to said second forward-feeding means for activating said drive mechanism to automatically repeat said backward-feeding action to prevent misfeeding of said sheet when said detection means sends said detection signal.
Claim 6
Dependent Claim
40 words
The sheet-feeding control device for the printer according to claim 3, wherein said first and second forward-feeding means each includes means for advancing said sheet to said predetermined position opposite said printhead when said detection means sends said detection signal.
Claim 7
Dependent Claim
31 words
The sheet-feeding device for the printer according to claim 3, wherein said first and second forward-feeding means each includes means for determining if said detection means has sent said detection signal.
Claim 8
Dependent Claim
38 words
The sheet-feeding device for the printer according to claim 3, wherein said second forward-feeding means includes means for displaying an error sign when said detection means sends no detection signal even after said second forward-feeding action is completed.
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |