Patent US4291262A successfully refreshed from Google Patents.
US4291262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo positioning apparatus
Assignee: Ricoh Co Ltd
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Filing: 1979-10-29
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Granted: 1981-09-22
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Expires: 1999-10-29
Abstract
Abstract While a motor shaft (13) is moving from a previous position to a present command position, the number of steps between the present command position and a new command position is calculated. After the shaft (13) reaches the present command position, the shaft (13) is driven to the new command position in accordance with the calculated number of steps.
Inventors
- 👤 Yoshinori Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:45
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B19/231; G05B19/232; B; B41; B41J; B41J1/00; B41J1/22; B41J1/24; G05B2219/00; G05B2219/30; G05B2219/42; G05B2219/42212
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
A servo positioning apparatus including a motor having a shaft and drive means for applying drive power to the motor, characterized by comprising: position difference storage means for storing a present position difference between a previous command shaft position and a present command shaft position, the drive means applying drive power to the motor in accordance with the present position difference; computing means for computing a new position difference between a new command shaft position and the present command position while the shaft is moving from the previous command position to the present command position; and control means for controlling the position difference storage means to store the new position difference when the shaft reaches the present command position.
Claim 2
Dependent Claim
119 words
A servo positioning apparatus including a motor having a shaft and drive means for applying drive power to the motor, characterized by comprising: position difference storage means for storing a present position difference between a previous command shaft position and a present command shaft position, the drive means applying drive power to the motor in accordance with the present position difference; computing means for computing a new position difference between a new command shaft position and the present command position while the shaft is moving from the previous command position to the present command position; and control means for controlling the position difference storage means to store the new position difference when the shaft reaches the present command position.
Claim 3
Dependent Claim
42 words
An apparatus as in claim 1, in which the position difference storage means comprises a down counter, the drive means comprising position pulse generator means for generating position pulses corresponding to rotational increments of the shaft, the position pulses decrementing the counter.
Claim 4
Dependent Claim
28 words
An apparatus as in claim 1, in which the computing means is constructed to compute a direction of shaft rotation in which the new position difference is minimum.
Claim 5
Dependent Claim
49 words
An apparatus as in claim 1, further comprising present command position storage means for storing the present command position for application to the computing means, the control means causing the present command position storage means to store the new command position when the shaft reaches the present command position.
Claim 6
Dependent Claim
37 words
An apparatus as in claim 1, further comprising a rotary type element fixed to the shaft, the apparatus further comprising code converter means for converting a type element code into the new command position which corresponds thereto.
Claim 7
Dependent Claim
16 words
An apparatus as in claim 5, in which the code converter means comprises a read-only memory.
Claim 8
Dependent Claim
17 words
An apparatus as in claim 4, in which the present command position storage means comprises a register.
Claim 9
Dependent Claim
25 words
An apparatus as in claim 2, in which the present position difference and the new position difference are constituted by respective numbers of rotational increments.
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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |