US4565950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo system
Assignee: Ricoh Co Ltd
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Filing: 1983-11-04
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Granted: 1986-01-21
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Expires: 2003-11-04
Abstract
Abstract At least two movable objects are respectively driven to move by servo motors or the like in response to independent drive start signals. When each of the objects reaches a predetermined position, a sync signal associated therewith is generated. If a time lag exists between the generation of the sync signals, one of the drive start signals supplied to the servo motors is delayed by a period of time which corresponds to the time lag.
Inventors
- 👤 Mitsutoyo Kikuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:30
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/20; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/25; G05B19/251; G05B19/253; G05B2219/00; G05B2219/30; G05B2219/33; G05B2219/33261; G05B2219/34; G05B2219/34052; G05B2219/34215
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A servo system for moving at least two movable objects to positions which are respectively predetermined therefor, said servo system comprising: drive start signal generator means for generating independent drive start signals which respectively cause the movable objects to start moving; servo motor means for driving the movable objects in response to the independent drive start signals; pulse signal generator means for generating pulse signals which respectively represent amounts of movement of the movable objects; reference signal generator means for generating independent reference velocity signals for respectively moving the movable objects; adder means for adding the pulse signals to the reference velocity signals associated therewith, the servo motor means being rotated at a velocity which corresponds to an output of the adder means; sync signal generator means for generating independent sync signals when the movable objects individually reach the predetermined positions; detector means for detecting a time lag between the sync signals; and prevention means for preventing said time lag from being developed.
Claim 2
Dependent Claim
163 words
A servo system for moving at least two movable objects to positions which are respectively predetermined therefor, said servo system comprising: drive start signal generator means for generating independent drive start signals which respectively cause the movable objects to start moving; servo motor means for driving the movable objects in response to the independent drive start signals; pulse signal generator means for generating pulse signals which respectively represent amounts of movement of the movable objects; reference signal generator means for generating independent reference velocity signals for respectively moving the movable objects; adder means for adding the pulse signals to the reference velocity signals associated therewith, the servo motor means being rotated at a velocity which corresponds to an output of the adder means; sync signal generator means for generating independent sync signals when the movable objects individually reach the predetermined positions; detector means for detecting a time lag between the sync signals; and prevention means for preventing said time lag from being developed.
Claim 3
Dependent Claim
34 words
A servo system as claimed in claim 1, in which the prevention means comprises delay means for delaying one of the drive signals by a period of time which corresponds to the time lag.
Claim 4
Dependent Claim
25 words
A servo system as claimed in claim 1, in which the drive start signal generator means and the detector means are constructed in a microcomputer.
Claim 5
Dependent Claim
22 words
A servo system as claimed in claim 1, further comprising a frequency-to-voltage converter means for converting the pulse signals into voltage signals.
Claim 6
Dependent Claim
19 words
A servo system as claimed in claim 1, in which the reference signal generator means comprises a digital-to-analog converter.
References Cited (Backward Citations)
GB1398410A
Cited
US3967170A
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US4130784A
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US4423360A
Cited
US4408281A
Cited
US4414495A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |