US3909125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepper motor control
Assignee: Xerox Corp
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Filing: 1974-02-22
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Granted: 1975-09-30
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Expires: 1994-02-22
Abstract
Abstract A feed control apparatus employing a control circuit for accurately positioning the shaft of a multiphase stepper motor by selective energization of respective phases of the motor under the influence of a low duty cycle power supply and a one way clutching mechanism thereby accurately positioning the motor in a proper angular position such that normal energization of the motor phase coils will result in the desired motor drive direction.
Inventors
- 👤 Edward G Reehil
- 👤 Edward L Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:05
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/04; H02P8/08; Y; Y10; Y10S; Y10S400/00; Y10S400/902
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
234 words
In an electrostatographic reproducing system having an image receptor element, the combination comprising an imaging station for placing an image on an area thereon, a transfer station for transferring said image to a copy surface, and means for driving said copy surface to said transfer station with said image area of said image receptor, said means for driving including a multiphase motor and a control system for positioning said motor on a predetermined phase at the beginning of a drive cycle, and driving said motor thereafter over a predetermined displacement, first control means applying a sequential series of phase emitting signals, a record control means providing a second series of control signals, said second control means responsive to said sequential series of control signals for applying said sequential series to said motor in a predetermined sequence, first power means for applying power to said motor, said motor being bidirectional loaded in a first direction to drive said copy surface toward said transfer station and free running in a reverse direction, said second control means including a first gating means for applying said first power means to said motor in said predetermined sequence whereby a predetermined phasE is positioned, second power means, second gating means responsive at the end of said predetermined sequence for applying said second power means to said motor in a normal sequence causing said motor to run in said loaded direction.
Claim 2
Dependent Claim
234 words
In an electrostatographic reproducing system having an image receptor element, the combination comprising an imaging station for placing an image on an area thereon, a transfer station for transferring said image to a copy surface, and means for driving said copy surface to said transfer station with said image area of said image receptor, said means for driving including a multiphase motor and a control system for positioning said motor on a predetermined phase at the beginning of a drive cycle, and driving said motor thereafter over a predetermined displacement, first control means applying a sequential series of phase emitting signals, a record control means providing a second series of control signals, said second control means responsive to said sequential series of control signals for applying said sequential series to said motor in a predetermined sequence, first power means for applying power to said motor, said motor being bidirectional loaded in a first direction to drive said copy surface toward said transfer station and free running in a reverse direction, said second control means including a first gating means for applying said first power means to said motor in said predetermined sequence whereby a predetermined phasE is positioned, second power means, second gating means responsive at the end of said predetermined sequence for applying said second power means to said motor in a normal sequence causing said motor to run in said loaded direction.
Claim 3
Dependent Claim
70 words
The reproducing system of claim 1 wherein said motor is a three phase motor and wherein said normal sequential series of control signal is applied to first second and third phases respectively for driving said motor in said first direction, said predetermined phase (being said third phase, and said gating means applies said first power means to said second phase first, said first phase second, and said third phase last.
Claim 4
Dependent Claim
50 words
The reproducing system of claim 1 wherever said first control means is a counter and decoder, said counter counting in accordance with a predetermined pulse input rate, and said decoder being coupled to said counter for applying a plurality of output signals, one for each phase of said multiphase motor.
Claim 5
Dependent Claim
125 words
The reproducing system of claim 3 wherein said second control means is a second counter and second decoder, said second counter coupled to said first counter and counting in accordance with the counting rate of said first counter, and second decoder supplying output signals along a second plurality of output lines, a first portion of said second plurality of output lines coupled to said first gating means for providing said predetermined sequence, a second portion of said second plurality of output lines coupled to said second gating means for applying said second power means and disabling said first gating means, and a third portion of said output lines coupled to said first and second counters to reset once after completing of said predetermined motor displacement.
References Cited (Backward Citations)
US3450995A
Cited
US3732005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |