US4193644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo control system
Assignee: Citizen Watch Co Ltd
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Filing: 1978-03-28
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Granted: 1980-03-18
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Expires: 1998-03-28
Abstract
Abstract A servo control system which can automatically control a position of a hydrostatically supported member such as a table of a machine tool, rotary shaft or the like is disclosed. The system comprises a closed loop control system including a differential amplifier for effecting a subtraction operation between an amount of displacement of a member and an amount of reference signal and a servo amplifier delivering a control signal and a servovalve for supplying operating pressure upon receipt of the control signal to the member, whereby the position of the member is controlled by the pressure applied thereto.
Inventors
- 👤 Masakazu Miyashita
- 👤 Akira Kanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:30
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0629; F16C32/064; F16C32/0644; F16C32/0648; B; B23; B23Q; B23Q1/00; B23Q1/25; B23Q1/26; B23Q1/38; B23Q1/385; G; G05; G05D; G05D3/00; G05D3/12; F16C2322/00; F16C2322/39
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A servo control system with closed loop control means for correcting a displacement of a member caused by an external force, said system comprising: (a) base means as a foundation; (b) supporting means secured to said base means for supporting said member; (c) first and second hydrostatic pads provided on said supporting means for hydrostatically supporting said member with said supporting member; (d) a displacement detector detecting an amount of the displacement of said member relative to said supporting means and transmitting a position reading signal; (e) a reference signal generator generating a reference position signal; (f) a differential amplifier connected to said displacement detector and said reference signal generator for transmitting a difference signal between said position reading signal and said reference position signal; (g) servo amplifier connected to said differential amplifier for amplifying said difference signal of said differential amplifier; and (h) a servovalve supplying an operating pressure corresponding to said difference signal delivered from said differential amplifier to said first and second hydrostatic pads.
Claim 2
Dependent Claim
167 words
A servo control system with closed loop control means for correcting a displacement of a member caused by an external force, said system comprising: (a) base means as a foundation; (b) supporting means secured to said base means for supporting said member; (c) first and second hydrostatic pads provided on said supporting means for hydrostatically supporting said member with said supporting member; (d) a displacement detector detecting an amount of the displacement of said member relative to said supporting means and transmitting a position reading signal; (e) a reference signal generator generating a reference position signal; (f) a differential amplifier connected to said displacement detector and said reference signal generator for transmitting a difference signal between said position reading signal and said reference position signal; (g) servo amplifier connected to said differential amplifier for amplifying said difference signal of said differential amplifier; and (h) a servovalve supplying an operating pressure corresponding to said difference signal delivered from said differential amplifier to said first and second hydrostatic pads.
Claim 3
Dependent Claim
22 words
The servo control system according to claim 1 further comprising a restrictor between said servovalve, and said first and second hydrostatic pads.
Claim 4
Dependent Claim
35 words
The servo control system according to claim 2 further comprising a third hydrostatic pad provided on said supporting means for controlling said member upward and downward, said third hydrostatic pad having a restrictor associated therewith.
Claim 5
Dependent Claim
208 words
A servo control system with a closed loop control means for correcting a displacement caused by an external force, said system comprising: (a) base means as a foundation; (b) supporting means secured to said base means for supporting said member; (c) first and second hydrostatic pads provided on said supporting means for hydrostatically supporting said member with said supporting member; (d) a first detector detecting an amount of displacement of said member relative to said supporting means and transmitting a position reading signal; (e) a reference signal generator generating a reference position signal; (f) a second detector detecting a motion position of said member and transmitting a motion position reading signal; (g) a comparator comparing said reference position signal and said motion position reading signal so as to transmit a comparison position reference signal; (h) a differential amplifier connected to said first detector and to said reference signal generator for transmitting a difference signal between said position reading signal and said comparison position reference signal; (i) a servo amplifier connected to said differential amplifier for amplifying said difference signal of said differential amplifier; and (j) a servovalve supplying an operating pressure corresponding to said difference signal delivered from said differential amplifier to said first and second hydrostatic pads.
Claim 6
Dependent Claim
208 words
A servo control system with a closed loop control means for correcting a displacement caused by an external force, said system comprising: (a) base means as a foundation; (b) supporting means secured to said base means for supporting said member; (c) first and second hydrostatic pads provided on said supporting means for hydrostatically supporting said member with said supporting member; (d) a first detector detecting an amount of displacement of said member relative to said supporting means and transmitting a position reading signal; (e) a reference signal generator generating a reference position signal; (f) a second detector detecting a motion position of said member and transmitting a motion position reading signal; (g) a comparator comparing said reference position signal and said motion position reading signal so as to transmit a comparison position reference signal; (h) a differential amplifier connected to said first detector and to said reference signal generator for transmitting a difference signal between said position reading signal and said comparison position reference signal; (i) a servo amplifier connected to said differential amplifier for amplifying said difference signal of said differential amplifier; and (j) a servovalve supplying an operating pressure corresponding to said difference signal delivered from said differential amplifier to said first and second hydrostatic pads.
Claim 7
Dependent Claim
28 words
The servo control system according to claim 4 wherein said second detector detects a rotational angle of said member so as to transmit a rotational angle reading signal.
Claim 8
Dependent Claim
29 words
The servo control system according to claim 4 wherein said second detector detects a linear motion of said member so as to transmit a linear motion position reading signal.
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) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |