US3831931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet paper feed out device in copier
Assignee: Fujifilm Business Innovation Corp
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Filing: 1972-06-02
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Granted: 1974-08-27
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Expires: 1992-06-02
Abstract
Abstract Sheet papers are piled up on a lifter which is spring biased upward and the uppermost paper is in pressed contact with a set of feed out rollers. The feed out rollers are rotatably provided at a fixed position and the papers are pressed thereon from underneath. The force by which the papers are pressed on the feed out rollers is controlled to be constant regardless of the number of sheets of papers by controlling the force of the spring for biasing the lifter upward.
Inventors
- 👤 T Tsukamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:24
CPC Classifications
B; B65; B65H; B65H1/00; B65H1/04; B65H1/08; B65H1/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A sheet paper feed out device comprising at least one feed out roller for feeding out sheet papers by friction; a lifter for lifting a stack of sheet papers located under said feed out roller; at least one tension spring for urging said lifter upward toward said feed out roller and pressing the stack of sheet papers against said feed out roller; at least one cable connected to the top of said lifter for moving said lifter vertically; pulley means for connecting said cable to one end of said tension spring; and tension control means connected to the other end of said tension spring so that the maximum tension in said spring, which occurs when the lifter is fully loaded with said sheet papers, and the minimum tension, which occurs when the lifter is unloaded, may be adjusted to keep the spring force substantially constant regardless of the number of sheet papers on the lifter.
Claim 2
Dependent Claim
155 words
A sheet paper feed out device comprising at least one feed out roller for feeding out sheet papers by friction; a lifter for lifting a stack of sheet papers located under said feed out roller; at least one tension spring for urging said lifter upward toward said feed out roller and pressing the stack of sheet papers against said feed out roller; at least one cable connected to the top of said lifter for moving said lifter vertically; pulley means for connecting said cable to one end of said tension spring; and tension control means connected to the other end of said tension spring so that the maximum tension in said spring, which occurs when the lifter is fully loaded with said sheet papers, and the minimum tension, which occurs when the lifter is unloaded, may be adjusted to keep the spring force substantially constant regardless of the number of sheet papers on the lifter.
Claim 3
Dependent Claim
35 words
A sheet paper feed out device as in claim 1 including at least one vertically disposed guide pole along which said lifter is guided, the lifter having an opening therein for receiving the guide pole.
Claim 4
Dependent Claim
31 words
A sheet paper feed out device as in claim 2 where at least one bearing is provided in said opening for facilitating the movement of said lifter along said guide pole.
Claim 5
Dependent Claim
28 words
A sheet paper feed out device as in claim 3 where said tension spring is disposed in a plane beneath and parallel to the plane of said lifter.
Claim 6
Dependent Claim
253 words
A sheet paper feed out device comprising at least one feed out roller for feeding out sheet papers by friction; a lifter for lifting a stack of sheet papers located under said feed out roller; at least one tension spring for urging said lifter upward toward said feed out roller and pressing the stack of sheet papers against said feed out roller, said tension spring being disposed in a plane beneath and parallel to the plane of said lifter; at least one cable connected to the top of said lifter for moving said lifter vertically; pulley means for connecting said cable to one end of said tension spring; at least one vertically disposed guide pole along which said lifter is guided, the lifter having an opening therein for receiving the guide pole and where at least one bearing is provided in said opening for facilitating the movement of said lifter along said guide pole; a slider connected to the other end of said tension spring for controlling the tension in said tension spring so that the maximum tension in said spring, which occurs when the lifter is fully loaded with said sheet papers, and the minimum tension, which occurs when the lifter is unloaded, may be adjusted to keep the spring force substantially constant regardless of the number of sheet papers on the lifter; and manual control means for moving said slider in the longitudinal direction of said spring, said manual control means being disposed outside of said sheet paper feed out device.
Claim 7
Dependent Claim
253 words
A sheet paper feed out device comprising at least one feed out roller for feeding out sheet papers by friction; a lifter for lifting a stack of sheet papers located under said feed out roller; at least one tension spring for urging said lifter upward toward said feed out roller and pressing the stack of sheet papers against said feed out roller, said tension spring being disposed in a plane beneath and parallel to the plane of said lifter; at least one cable connected to the top of said lifter for moving said lifter vertically; pulley means for connecting said cable to one end of said tension spring; at least one vertically disposed guide pole along which said lifter is guided, the lifter having an opening therein for receiving the guide pole and where at least one bearing is provided in said opening for facilitating the movement of said lifter along said guide pole; a slider connected to the other end of said tension spring for controlling the tension in said tension spring so that the maximum tension in said spring, which occurs when the lifter is fully loaded with said sheet papers, and the minimum tension, which occurs when the lifter is unloaded, may be adjusted to keep the spring force substantially constant regardless of the number of sheet papers on the lifter; and manual control means for moving said slider in the longitudinal direction of said spring, said manual control means being disposed outside of said sheet paper feed out device.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |