Patent US3919972A successfully refreshed from Google Patents.
US3919972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic cut sheet feeding unit
Assignee: Canon Inc
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Filing: 1972-05-23
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Granted: 1975-11-18
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Expires: 1992-05-23
Abstract
Abstract An automatic cut sheet feeding device provided with a cut sheet box with an open top. The box is provided with a separation pawl facing the inside and located on each end of the upper side of the sheet feeding lateral side, the separation pawls being mounted to allow the box to move vertically to some degree. The bottom surface of the box body is inserted into the space between the lower side and the bottom surface of the arm in order to limit the separation pawls from moving over a certain degree. By said arrangement, the device can feed the cut sheets effectively into the copying device automatically, without requiring an additional guide etc., even when the number of sheets has been reduced.
Inventors
- 👤 Shigehiro Komori
- 👤 Hisashi Sakamaki
- 👤 Hiroyuki Hattori
- 👤 Toshihide Iida
- 👤 Koichi Miyamoto
- 👤 Kazumi Umezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6517; B; B65; B65H; B65H1/00; B65H1/08; B65H1/12; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/585; G03B27/586; G03G15/6502
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
An automatic cut sheet feeding unit comprising in combination, a box type body, said box type body comprising a separation pawl on top of each forward corner section thereof, the separation pawl being movable between a fixed upper and variable lower positions relative to the box type body, an intermediate plate which carries a stack of cut sheets and is accommodated in the box type body, spring means between the box type body and the intermediate plate and used to press the cut sheets loaded on the intermediate plate against the bottom face of the separation pawls in the fixed upper position, a feed roller mounted to be movable between a position out of contact with the stack, in which position the spring means urges the stack against the pawl and forces the pawl to its fixed upper position and a feeding position in pressure contact with the stack and below the upper fixed position of the pawl so that the pawl rests against the stack by its own weight, said feed roller, on receiving a feed signal, feeding the cut sheets loaded on the intermediate plate, and means to drive and control the feed roller.
Claim 2
Dependent Claim
196 words
An automatic cut sheet feeding unit comprising in combination, a box type body, said box type body comprising a separation pawl on top of each forward corner section thereof, the separation pawl being movable between a fixed upper and variable lower positions relative to the box type body, an intermediate plate which carries a stack of cut sheets and is accommodated in the box type body, spring means between the box type body and the intermediate plate and used to press the cut sheets loaded on the intermediate plate against the bottom face of the separation pawls in the fixed upper position, a feed roller mounted to be movable between a position out of contact with the stack, in which position the spring means urges the stack against the pawl and forces the pawl to its fixed upper position and a feeding position in pressure contact with the stack and below the upper fixed position of the pawl so that the pawl rests against the stack by its own weight, said feed roller, on receiving a feed signal, feeding the cut sheets loaded on the intermediate plate, and means to drive and control the feed roller.
Claim 3
Dependent Claim
35 words
An automatic cut sheet feeding unit as set forth in claim 1, wherein the spring means is installed at the end of the paper feeding side between the intermediate plate and the box type body.
Claim 4
Dependent Claim
35 words
An automatic cut sheet feeding unit as set Forth in claim 1, wherein the spring means is installed in between the box type body and the intermediate plate to push up the intermediate plate horizontally.
Claim 5
Dependent Claim
52 words
An automatic cut sheet feeding unit as set forth in claim 1, wherein the box type body possesses a fixed lid and movable lid and, means mounting said box type body and its movable lid on a copying device for said movable lid to serve as a tray for the copied paper.
Claim 6
Dependent Claim
85 words
An automatic cut sheet feeding unit as set forth in claim 1, wherein the box type body so composed as to be provided with a side presser on each lateral side when facing the paper feeding direction and a spring used to place the side pressers in positions spaced by a distance narrower than the width of the cut sheet, and the side pressers have a slope at the upper section thereof so as to allow the cut sheets to be inserted and loaded automatically.
Claim 7
Dependent Claim
154 words
An automatic cut sheet feeding unit comprising in combination: a box type body, a separation pawl adjacent each forward corner section thereof and free to move substantially, vertically relative to said box type body, an intermediate plate accommodated in the box type body for carrying cut sheets thereon, said separation pawls bearing against the upper surface of the cut sheets with a constant pressure, resilient means operative against said intermediate plate to urge said plate in a direction to press the uppermost of the cut sheets loaded on the intermediate plate towards a discharge position, a feed roller mounted above the cut sheets to cooperate with said resilient means to exert a pressure upon the upper surface of the cut sheets at the discharge position, said feed roller operative upon receiving a feed signal, to feed the uppermost cut sheet loaded on the intermediate plate, and means to drive and control said feed roller.
Claim 8
Dependent Claim
154 words
An automatic cut sheet feeding unit comprising in combination: a box type body, a separation pawl adjacent each forward corner section thereof and free to move substantially, vertically relative to said box type body, an intermediate plate accommodated in the box type body for carrying cut sheets thereon, said separation pawls bearing against the upper surface of the cut sheets with a constant pressure, resilient means operative against said intermediate plate to urge said plate in a direction to press the uppermost of the cut sheets loaded on the intermediate plate towards a discharge position, a feed roller mounted above the cut sheets to cooperate with said resilient means to exert a pressure upon the upper surface of the cut sheets at the discharge position, said feed roller operative upon receiving a feed signal, to feed the uppermost cut sheet loaded on the intermediate plate, and means to drive and control said feed roller.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |