US3558127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet handling apparatus
Assignee: Xerox Corp
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Filing: 1968-11-19
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Granted: 1971-01-26
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Expires: 1988-11-19
Abstract
Abstract Sheet-handling apparatus for retaining a stack of sheet material at a predetermined level so that the topmost sheet may be forwarded therefrom by cooperable sheet-forwarding means. The apparatus includes a sensor bar pivotal into contact with the topmost sheet in the stack. The pivotal motion of the sensor bar controls two switches so that the upward motion of the stack will cause the opening of the first of the switches to reduce the speed of further upward movement of the stack. Continued pivotal movement of the sensor bar, caused by the slow movement of the stack, then opens the second switch to stop the stack at a predetermined height.
Inventors
- 👤 Roy E Blewitt Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:44
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6502; B; B65; B65H; B65H1/00; B65H1/08; B65H1/14; B65H1/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
Apparatus for elevating a stack of sheet material to a predetermined height including: sensing means mounted for movement in response to sheet material moved toward the predetermined height; motor means adapted to move the stack of sheet material to the predetermined height; motor control circuit means having first and second paths for delivering alternating current and half-wave rectified current, respectively, to said motor means to operate said motor means at a fast or slow speed; first switching means coupled with said sensing means for disabling said first path and enabling said second path as said stack of sheet material is moved toward the predetermined height at the fast speed; second switching means coupled with said sensing means for disabling said first and second path to interrupt current to said motor means and stop the stack of sheet material in response to the sheet material arriving at the predetermined height.
Claim 2
Dependent Claim
149 words
Apparatus for elevating a stack of sheet material to a predetermined height including: sensing means mounted for movement in response to sheet material moved toward the predetermined height; motor means adapted to move the stack of sheet material to the predetermined height; motor control circuit means having first and second paths for delivering alternating current and half-wave rectified current, respectively, to said motor means to operate said motor means at a fast or slow speed; first switching means coupled with said sensing means for disabling said first path and enabling said second path as said stack of sheet material is moved toward the predetermined height at the fast speed; second switching means coupled with said sensing means for disabling said first and second path to interrupt current to said motor means and stop the stack of sheet material in response to the sheet material arriving at the predetermined height.
Claim 3
Dependent Claim
55 words
The apparatus as set forth in claim 1 wherein said sensing means is moved and said second switching means reactivated by the removal of sheet material from the stack to drive said motor and said stack of sheet material at the slow speed to again raise the stack of sheet material to the predetermined height.
Claim 4
Dependent Claim
84 words
The apparatus as set forth in claim 2 wherein the first and second switching means are connected in series and said circuit means includes a rectifier in parallel with said first switching means so that alternating current is passed through said first and second switching means, bypassing said rectifier, when said motor is being driven at the fast speed and so that half-Wave rectified current is passed through said rectifier and second switching means when said motor is being driven at the slow speed.
Claim 5
Dependent Claim
171 words
Apparatus for moving a workpiece and then stopping it at a predetermined location including: motor means operable to move the workpiece; circuit means to deliver full wave current to said motor means to drive said motor and the workpiece at a fast speed as it moves toward the predetermined location; sensor means to detect when the workpiece approaches the predetermined location and, in response thereto, to modify said circuit means to deliver half-wave current to said motor means to drive said workpiece at a slow speed; and means responsive to the arrival of the workpiece at said predetermined location to interrupt current to said motor means to stop the workpiece at a predetermined location; said circuit means including a first switching means and a rectifier in parallel and a second switching means in series therewith and wherein the fast speed is attained through alternating current passing through said first and second switching means while the slow speed is attained through half-wave current passing through said rectifier and said second switching means.
Claim 6
Dependent Claim
171 words
Apparatus for moving a workpiece and then stopping it at a predetermined location including: motor means operable to move the workpiece; circuit means to deliver full wave current to said motor means to drive said motor and the workpiece at a fast speed as it moves toward the predetermined location; sensor means to detect when the workpiece approaches the predetermined location and, in response thereto, to modify said circuit means to deliver half-wave current to said motor means to drive said workpiece at a slow speed; and means responsive to the arrival of the workpiece at said predetermined location to interrupt current to said motor means to stop the workpiece at a predetermined location; said circuit means including a first switching means and a rectifier in parallel and a second switching means in series therewith and wherein the fast speed is attained through alternating current passing through said first and second switching means while the slow speed is attained through half-wave current passing through said rectifier and said second switching means.
Claim 7
Dependent Claim
113 words
Apparatus for moving a workpiece and then stopping it at a predetermined location including: motor means operable to move the workpiece; circuit means to deliver full-wave current to said motor means to drive said motor and the workpiece at a fast speed as it moves toward the predetermined location; sensor means to detect when the workpiece approaches the predetermined location and, in response thereto, to modify said circuit means to deliver half-wave current to said motor means to drive said workpiece at a slow speed; and means responsive to the arrival of the workpiece at said predetermined location to interrupt current to said motor means to stop the workpiece at the predetermined location.
Claim 8
Dependent Claim
113 words
Apparatus for moving a workpiece and then stopping it at a predetermined location including: motor means operable to move the workpiece; circuit means to deliver full-wave current to said motor means to drive said motor and the workpiece at a fast speed as it moves toward the predetermined location; sensor means to detect when the workpiece approaches the predetermined location and, in response thereto, to modify said circuit means to deliver half-wave current to said motor means to drive said workpiece at a slow speed; and means responsive to the arrival of the workpiece at said predetermined location to interrupt current to said motor means to stop the workpiece at the predetermined location.
Claim 9
Dependent Claim
160 words
Apparatus for moving a workpiece and then stopping it at a predetermined location including; motor means operable to move the workpiece; circuit means to deliver full-wave current to said motor means to drive said motor and the workpiece at a fast speed as it moves toward the predetermined location; sensor means to detect when the workpiece approaches the predetermined location and, in response thereto, to modify said circuit means to deliver half-wave current to said motor means to drive said workpiece at a slow speed; and means responsive to the arrival of the workpiece at said predetermined location to interrupt current to said motor means to stop the workpiece at the predetermined location; said circuit means including two switching means and a rectifier and wherein the slow speed is attained through half-wave current passing through said rectifier and one of said switching means while the fast speed is attained through full-wave current passing through the other of said switching means.
Claim 10
Dependent Claim
160 words
Apparatus for moving a workpiece and then stopping it at a predetermined location including; motor means operable to move the workpiece; circuit means to deliver full-wave current to said motor means to drive said motor and the workpiece at a fast speed as it moves toward the predetermined location; sensor means to detect when the workpiece approaches the predetermined location and, in response thereto, to modify said circuit means to deliver half-wave current to said motor means to drive said workpiece at a slow speed; and means responsive to the arrival of the workpiece at said predetermined location to interrupt current to said motor means to stop the workpiece at the predetermined location; said circuit means including two switching means and a rectifier and wherein the slow speed is attained through half-wave current passing through said rectifier and one of said switching means while the fast speed is attained through full-wave current passing through the other of said switching means.
References Cited (Backward Citations)
US2821672A
Cited
US2847091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |