US3896361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for compensating an error in numerical control
Assignee: Fujitsu Ltd
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Filing: 1970-10-12
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Granted: 1975-07-22
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Expires: 1990-10-12
Abstract
Abstract A method and apparatus providing compensation for an error or deviation occuring in numerical control apparatus having a servocontrol system, wherein a command signal quantity and a compensating signal quantity are applied simultaneously to a pulse motor connected to drive a movable machine element. The compensating signal quantity is obtained from a summing device which combines the command signal quantity, a signal generated in proportion to the actual velocity of the movable machine element, and a deviation signal generated in proportion to the command signal quantity. The deviation signal is provided by a deviation setting circuit so as to vary linearly in relation to a command velocity determined by the command signal quantity during the time the command is issued so that continuous path control of the movable element can be carried out accurately.
Inventors
- 👤 Seiuemon Inaba
- 👤 Kanryo Shimizu
- 👤 Yoshihiro Hashimoto
- 👤 Youichi Amemiya
- 👤 Hiroshi Usami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:55
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B2219/00; G05B2219/30; G05B2219/34; G05B2219/34156; G05B2219/41; G05B2219/41065; G05B2219/41186; G05B2219/42; G05B2219/42163
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
226 words
In a numerical control system including pulse motor means for driving a movable element of a machine, means for generating pulses in proportion to the actual velocity of said movable element, and means for supplying command velocity input pulses, an improvement for compensating for an error in said numerical control system comprising, means for applying input signals to said pulse motor means to drive said pulse motor means to control a velocity of movement of said movable element, deviation signal generating means having an input for application of said command velocity input pulses and having an output for producing deviation signal pulses in proportion to a command velocity determined by said command input pulses, means for combining said command input pulses, said deviation signal pulses, and said actual velocity pulses to produce compensating pulses, means for applying said compensating pulses and said command velocity input pulses to said means for applying input signals to said pulse motor means, said means for applying input signals to said pulse motor means including means for applying said command velocity input pulses as an electrical input to said pulse motor means, and pulse responsive means connected to said pulse motor means for supplying a mechanical input thereto in response to said compensating pulses for altering the velocity of said pulse motor means as determined by said command velocity input pulses.
Claim 2
Dependent Claim
226 words
In a numerical control system including pulse motor means for driving a movable element of a machine, means for generating pulses in proportion to the actual velocity of said movable element, and means for supplying command velocity input pulses, an improvement for compensating for an error in said numerical control system comprising, means for applying input signals to said pulse motor means to drive said pulse motor means to control a velocity of movement of said movable element, deviation signal generating means having an input for application of said command velocity input pulses and having an output for producing deviation signal pulses in proportion to a command velocity determined by said command input pulses, means for combining said command input pulses, said deviation signal pulses, and said actual velocity pulses to produce compensating pulses, means for applying said compensating pulses and said command velocity input pulses to said means for applying input signals to said pulse motor means, said means for applying input signals to said pulse motor means including means for applying said command velocity input pulses as an electrical input to said pulse motor means, and pulse responsive means connected to said pulse motor means for supplying a mechanical input thereto in response to said compensating pulses for altering the velocity of said pulse motor means as determined by said command velocity input pulses.
Claim 3
Dependent Claim
178 words
In a numerical control system composed of a numerical control device giving command pulses, an electrohydraulic pulse motor capable of generating output torques to move a machine in response to said command pulses, a detecting means for detecting an actual movement quantity of a movable part of a machine, and a compensating pulse generating means for generating compensating pulses in response to which said electro-hydraulic pulse motor generates output torques for compensating the error of movement of said part of the machine, an apparatus for compensating an error in the numerical control system comprising, a deviation setting means for issuing pulses representing a steady-state deviation proportional to the frequency of said command pulses, and a compensating pulse generating means for generating said compensating pulses so that the resultant of an addition of said steady-state deviation pulses, said command pulses, and feedback pulses corresponding to said actUal movement quantity of said part and detected by said detecting means, is made zero, whereby the error of the numerical control system maintains a proportional relationship to the velocity of said command.
Claim 4
Dependent Claim
178 words
In a numerical control system composed of a numerical control device giving command pulses, an electrohydraulic pulse motor capable of generating output torques to move a machine in response to said command pulses, a detecting means for detecting an actual movement quantity of a movable part of a machine, and a compensating pulse generating means for generating compensating pulses in response to which said electro-hydraulic pulse motor generates output torques for compensating the error of movement of said part of the machine, an apparatus for compensating an error in the numerical control system comprising, a deviation setting means for issuing pulses representing a steady-state deviation proportional to the frequency of said command pulses, and a compensating pulse generating means for generating said compensating pulses so that the resultant of an addition of said steady-state deviation pulses, said command pulses, and feedback pulses corresponding to said actUal movement quantity of said part and detected by said detecting means, is made zero, whereby the error of the numerical control system maintains a proportional relationship to the velocity of said command.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |