US3586951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Numerically controlied machine system driven by electrohydraulic pulse motor
Assignee: Fujitsu Ltd
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Filing: 1970-05-01
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Granted: 1971-06-22
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Expires: 1990-05-01
Abstract
Abstract An electric pulse motor has an input electrically connected to a source of control signals and an output mechanically coupled to the input of a differential mechanism. A compensating electric pulse motor has an output mechanically coupled to the input of the differential mechanism. A rotary pilot valve is mechanically coupled to the output of the differential mechanism. A compensating circuit has an input electrically connected to a machine which is mechanically coupled to the valve and an output electrically connected to the compensating electric pulse motor. The compensating circuit derives a compensating signal in accordance with an error in the machine and supplies the compensating signal to the compensating electric pulse motor to rotate the compensating electric pulse motor in accordance with the compensating signal.
Inventors
- 👤 Seiuemon Inaba
- 👤 Kanryo Shimizu
- 👤 Yoshihiro Hashimoto
- 👤 Hiroshi Usami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:47
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; F15B21/087; F15B13/00; F15B13/16; F15B9/00; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41065; G05B2219/41309
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
A numerically controlled machine system driven by an electrohydraulic pulse motor, said machine system comprising: a source of control signals; a differential mechanism having an input and an output; an electric pulse motor having an input electrically connected to said source of control signals and an output mechAnically coupled to the input of said differential mechanism, said electric pulse motor being driven by control signals from said source of control signals; a compensating electric pulse motor having an input and an output mechanically coupled to the input of said differential mechanism; a rotary pilot valve mechanically coupled to the output of said differential mechanism; a machine mechanically coupled to said rotary pilot valve; and compensating means having an input electrically connected to said machine and an output electrically connected to said compensating electric pulse motor for deriving a compensating signal in accordance with an error in said machine and supplying said compensating signal to said compensating electric pulse motor to rotate said compensating electric pulse motor in accordance with said compensating signal.
Claim 2
Dependent Claim
172 words
A numerically controlled machine system driven by an electrohydraulic pulse motor, said machine system comprising: a source of control signals; a differential mechanism having an input and an output; an electric pulse motor having an input electrically connected to said source of control signals and an output mechAnically coupled to the input of said differential mechanism, said electric pulse motor being driven by control signals from said source of control signals; a compensating electric pulse motor having an input and an output mechanically coupled to the input of said differential mechanism; a rotary pilot valve mechanically coupled to the output of said differential mechanism; a machine mechanically coupled to said rotary pilot valve; and compensating means having an input electrically connected to said machine and an output electrically connected to said compensating electric pulse motor for deriving a compensating signal in accordance with an error in said machine and supplying said compensating signal to said compensating electric pulse motor to rotate said compensating electric pulse motor in accordance with said compensating signal.
Claim 3
Dependent Claim
31 words
A numerically controlled machine system as claimed in claim 1, further comprising an hydraulic motor mechanically coupled between the output of said rotary pilot valve and the input of said machine.
Claim 4
Dependent Claim
99 words
A numerically controlled machine system as claimed in claim 2, further comprising an Inductosyn scale and a cooperating Inductosyn slider on said machine, and wherein said compensating means comprises a sine wave oscillator electrically connected to said Inductosyn slider, a first resolver having a rotor mechanically coupled to said hydraulic motor and a stator electrically connected to said sine wave oscillator, a second resolver having a stator electrically connected to the stator of said first resolver and a rotor mechanically coupled to said differential mechanism and coupling means electrically coupling said second resolver to said compensating electric pulse motor.
Claim 5
Dependent Claim
167 words
A numerically controlled machine system as claimed in claim 3, wherein the coupling means of said compensating means comprises a phase discriminator having one input electrically connected to the stator of said second resolver and another input electrically connected to said Inductosyn scale and an output, a pair of gates each operated by a different polarity signal connected to the output of said phase discriminator and to said compensating electric pulse motor, and a pulse oscillator connected to said gates in a manner whereby when said phase discriminator produces an output signal of one polarity it switches one of said gates to its conductive condition and said one of said gates transfers a pulse from said pulse oscillator to said compensating electric pulse motor and when said phase discriminator produces an output signal of the opposite polarity it switches the other of said gates to its conductive condition and said other of said gates transfers a pulse from said pulse oscillator to said compensating electric pulse motor.
Claim 6
Dependent Claim
80 words
A numerically controlled machine system as claimed in claim 5, wherein said differential mechanism comprises a plurality of intercoupled gears, one of said gears being coupled to and rotating with said electric pulse motor, another of said gears being coupled to and rotating with said compensating electric pulse motor, another of said gears being coupled to and rotating said rotary pilot valve and another of said gears being coupled to and rotating with the second resolver of said compensating means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |