US3736487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepping motor drive circuit
Assignee: AT&T Teletype Corp
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Filing: 1966-08-03
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Granted: 1973-05-29
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Expires: 1986-08-03
Abstract
Abstract A circuit for moving the rotor of a stepping motor from one position to another without vibration or oscillation including means for energizing the magnets of the stepping motor that would normally be energized to move the rotor of the motor from a first position to a second position for a first predetermined period of time, means for energizing the magnets that would normally be energized to return the rotor from the second position to the first position for a second predetermined period of time and means for re-energizing the magnets would normally be energized to move the rotor from the first position to the second position.
Inventors
- 👤 H Cook
- 👤 O Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:36
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
293 words
In a stepping motor operating circuit of the type including a pair of flip-flops each having inputs and having outputs connected to the inputs of a stepping motor, a pair of input leads and circuitry interconnecting the input leads, the outputs of the flip-flops, and the inputs of the flip-flops so that successive pulses on one of the input leads cause the flip-flops to produce output pulses that rotate the stepping motor in one direction and so that successive pulses on the other input lead cause the flip-flops to produce output pulses that rotate the stepping motor in the other direction, the combination with the input leads of a drive circuit including a pulsing lead, a pair of delay circuits each having an input and an output and means for connecting the pulsing lead to one of the input leads and to the input of one of the delay circuits, for connecting the output of said one of the delay circuits to the other of the input leads and to the input of the other of the delay circuits and for connecting the output of said other of the delay circuits to said one of the input leads so that a single pulse on the pulsing lead changes the flip-flops from a first condition to a second condition thereby energizing the stepping motor to move its rotor from a first position to a second position then changes the flipflops from the second condition to the first condition thereby energizing the stepping motor to move its rotor from the second position to the first position then changes the flip-flops from the first condition to the second condition thereby energizing the stepping motor to move its rotor from the first position to the second position.
Claim 2
Dependent Claim
293 words
In a stepping motor operating circuit of the type including a pair of flip-flops each having inputs and having outputs connected to the inputs of a stepping motor, a pair of input leads and circuitry interconnecting the input leads, the outputs of the flip-flops, and the inputs of the flip-flops so that successive pulses on one of the input leads cause the flip-flops to produce output pulses that rotate the stepping motor in one direction and so that successive pulses on the other input lead cause the flip-flops to produce output pulses that rotate the stepping motor in the other direction, the combination with the input leads of a drive circuit including a pulsing lead, a pair of delay circuits each having an input and an output and means for connecting the pulsing lead to one of the input leads and to the input of one of the delay circuits, for connecting the output of said one of the delay circuits to the other of the input leads and to the input of the other of the delay circuits and for connecting the output of said other of the delay circuits to said one of the input leads so that a single pulse on the pulsing lead changes the flip-flops from a first condition to a second condition thereby energizing the stepping motor to move its rotor from a first position to a second position then changes the flipflops from the second condition to the first condition thereby energizing the stepping motor to move its rotor from the second position to the first position then changes the flip-flops from the first condition to the second condition thereby energizing the stepping motor to move its rotor from the first position to the second position.
Claim 3
Dependent Claim
45 words
The combination according to claim 1 further including a reversing switch connected between the pulsing circuit and the input leads and adapted to cause the pulsing circuit to operate upon the input leads so that the flip-flops energize the stepping motor in a reverse direction.
Claim 4
Dependent Claim
50 words
The combination according to claim 1 wherein said one of the delay circuits changes the flip-flops from the second condition to the first condition after a predetermined period of time and wherein said other delay circuit returns the flip-flops to the first condition after approximately the same period of time.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |