US4519601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet feeding apparatus
Assignee: Toshiba Corp
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Filing: 1982-12-02
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Granted: 1985-05-28
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Expires: 2002-12-02
Abstract
Abstract A paper feeding device having a pulse motor controller which controls the pulse motor so that the transfer roller is decelerated in a rotational angle larger than the rotational angle due to the inertia of the drive system consisting of the transfer roller and the pulse motor, thereby suppressing over-rotation of the transfer roller due to the inertia of the drive system.
Inventors
- 👤 Junji Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:44
CPC Classifications
B; B65; B65H; B65H3/00; B65H3/02; B65H3/06; B65H3/0669
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A sheet feeding apparatus comprising: transfer roller means for conveying the sheet by utilizing rotation frictional force; one-way clutch means, connected to said transfer roller means, for rotating said transfer roller means intermittently in one direction; step motor means for rotating said transfer roller means via said one-way clutch means thereby conveying the sheet along a given path; and motor control means for gradually decelerating said step motor means at a rate to cause a rotation angle of said transfer roller means during deceleration to be greater than an overdrive rotation angle determined by inherent inertia of said transfer roller means and said one-way clutch means.
Claim 2
Dependent Claim
106 words
A sheet feeding apparatus comprising: transfer roller means for conveying the sheet by utilizing rotation frictional force; one-way clutch means, connected to said transfer roller means, for rotating said transfer roller means intermittently in one direction; step motor means for rotating said transfer roller means via said one-way clutch means thereby conveying the sheet along a given path; and motor control means for gradually decelerating said step motor means at a rate to cause a rotation angle of said transfer roller means during deceleration to be greater than an overdrive rotation angle determined by inherent inertia of said transfer roller means and said one-way clutch means.
Claim 3
Dependent Claim
183 words
A sheet feeding apparatus according to claim 1, wherein said motor control means comprises: clock signal generating means for generating clock signals; read-only memory means for storing a plurality of time data in which said step motor means is excited, the plural time data causing said transfer roller means to stop and the sheet of paper P to be conveyed to a specific position; timer means connected to said read-only memory means and said clock signal generating means for sending a coincidence signal when the data from said memory means and the value of count for clock signal coincide; processor means connected to said timer means and said read-only memory means for reading out a next data in said read-only memory means and setting this in said timer means when the coincidence signal from said timer means is inputted, and simultaneously for sending a signal of changing over the excitation phase to said step motor means in a predetermined order; and drive means for sending a specific drive signal to said step motor means according to the changing-over signal from said processor means.
Claim 4
Dependent Claim
54 words
A sheet feeding apparatus according to claim 2, wherein each of the time data stored in said read-only memory means is the excitation time for the excitation phase in consecutive change-over ti (i=1, 2, 3, . . . , n) divided by the time of a clock period tc in said clock generating means.
Claim 5
Dependent Claim
33 words
A sheet feeding apparatus according to claim 3, wherein the time data stored in said read-only memory means are so set that in the deceleration interval the excitation time ti is successively larger.
References Cited (Backward Citations)
US3207505A
Cited
US3581000A
Cited
US3743275A
Cited
US3936041A
Cited
US3966198A
Cited
US4175694A
Cited
US4268021A
Cited
US4394010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |