US3889105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic back up of a numerical control
Assignee: General Electric Co
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Filing: 1974-08-20
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Granted: 1975-06-10
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Expires: 1994-08-20
Abstract
Abstract A numerical contouring control capable of backing up along the path commanded by the block of data controlling the machine tool. When the control is in the backup mode of operation, the counting direction of the X and Y integrand counters of the contouring function generator and the direction control signals for the X and Y motion commands are reversed so that the machine tool reverses its direction along the commanded path. The counting direction of the X and Y distance counters is also reversed in the backup mode so that the X and Y distance counters continue to keep track of the X and Y distances from the present commanded position to the end point of the commanded path. The backup mode is manually terminated by the operator or is automatically terminated when the machine tool reaches the beginning of the commanded path. When the machine tool is returned to the normal mode of operation, the machine tool retraces and completes the commanded path.
Inventors
- 👤 Ulrich H Schneekloth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:28
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/37; G05B19/371; G05B2219/00; G05B2219/30; G05B2219/34; G05B2219/34163; G05B2219/50; G05B2219/50111
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
An improved numerical contouring control of the type having a function generator for generating first and second pulse trains, each pulse representing a commanded increment of motion along a first and second orthogonal axis, said function generator including first and second counters for controlling the rate of generating the pulses, said control also having first and second motor command circuits each responsive to one of said pulse trains and to a direction signal for positioning a machine tool and first and second distance counters for keeping track of the distance to be commanded, along each axis, wherein the improvement comprises: a. first backup counter responsive to the first pulse train for counting the commanded distance along one axis; b. second backup counter responsive to the second pulse train for counting the commanded distance along the other axis; c. control means responsive to a signal indicating that the control is in a backup mode for reversing the motor command direction signals and for reversing the counting direction of the function generator counters, the distance counters and the backup counters; and d. logic means for sensing a count in the first and second back up counters and automatically ending the backup mode of operation.
Claim 2
Dependent Claim
202 words
An improved numerical contouring control of the type having a function generator for generating first and second pulse trains, each pulse representing a commanded increment of motion along a first and second orthogonal axis, said function generator including first and second counters for controlling the rate of generating the pulses, said control also having first and second motor command circuits each responsive to one of said pulse trains and to a direction signal for positioning a machine tool and first and second distance counters for keeping track of the distance to be commanded, along each axis, wherein the improvement comprises: a. first backup counter responsive to the first pulse train for counting the commanded distance along one axis; b. second backup counter responsive to the second pulse train for counting the commanded distance along the other axis; c. control means responsive to a signal indicating that the control is in a backup mode for reversing the motor command direction signals and for reversing the counting direction of the function generator counters, the distance counters and the backup counters; and d. logic means for sensing a count in the first and second back up counters and automatically ending the backup mode of operation.
Claim 3
Dependent Claim
232 words
An improved numerical contouring control of the type having a function generator for generating first and second pulse trains, each pulse representing a commanded increment of motion along a first and second orthogonal axis, said function generator including first and second counters for controlling the rate of generating the pulses, said control also having first and second motor command circuits each responsive to one of said pulse trains and to a direction signal for positioning a machine tool and first and second distance counters for keeping track of the distance to be commanded along each axis, wherein the improvement comprises: a. a first register for storing an initial value of the distance to be commanded along one axis; b. a second register for storing an initial value of the distance to be commanded along the other axis; c. control means responsive to a signal indicating that the control is in a backup mode for reversing the motor command direction signals and for reversing the counting direction of the function generator counters and the distance counters; and d. logic means for automatically ending the backup mode of operation when the difference between the number in the first distance counter and the number in the first register equals a predetermined number or when the difference between the number in the second distance counter and the number in the second register equals said predetermined number.
Claim 4
Dependent Claim
232 words
An improved numerical contouring control of the type having a function generator for generating first and second pulse trains, each pulse representing a commanded increment of motion along a first and second orthogonal axis, said function generator including first and second counters for controlling the rate of generating the pulses, said control also having first and second motor command circuits each responsive to one of said pulse trains and to a direction signal for positioning a machine tool and first and second distance counters for keeping track of the distance to be commanded along each axis, wherein the improvement comprises: a. a first register for storing an initial value of the distance to be commanded along one axis; b. a second register for storing an initial value of the distance to be commanded along the other axis; c. control means responsive to a signal indicating that the control is in a backup mode for reversing the motor command direction signals and for reversing the counting direction of the function generator counters and the distance counters; and d. logic means for automatically ending the backup mode of operation when the difference between the number in the first distance counter and the number in the first register equals a predetermined number or when the difference between the number in the second distance counter and the number in the second register equals said predetermined number.
Claim 5
Dependent Claim
231 words
An improved numerical contouring control of the type having a function generator for generating first and second pulse trains, each pulse representing a commanded increment of motion along a first and second orthogonal axis, said function generator including first and second counters for controlling the rate of generating the pulses, said control also having first and second motor command circuits each responsive to one of said pulse trains and to a direction signal for positioning a machine tool and first and second distance counters for keeping track of the distance to be commanded, along each axis, wherein the improvement comprises: a. a first register for storing the initial value of the first counter in the function generator; b. a second register for storing the initial value of the second counter in the function generatOr; c. control means responsive to a signal indicating that the control is in a backup mode for reversing the motor command direction signals and for reversing the counting direction of the function generator counters and the distance counters; and d. logic means for automatically ending the backup mode of operation when the difference between the number in the function generator first counter and the number in the first register equals a predetermined number or when the difference between the number in the function generator second counter and the number in the second register equals said predetermined number.
Claim 6
Dependent Claim
231 words
An improved numerical contouring control of the type having a function generator for generating first and second pulse trains, each pulse representing a commanded increment of motion along a first and second orthogonal axis, said function generator including first and second counters for controlling the rate of generating the pulses, said control also having first and second motor command circuits each responsive to one of said pulse trains and to a direction signal for positioning a machine tool and first and second distance counters for keeping track of the distance to be commanded, along each axis, wherein the improvement comprises: a. a first register for storing the initial value of the first counter in the function generator; b. a second register for storing the initial value of the second counter in the function generatOr; c. control means responsive to a signal indicating that the control is in a backup mode for reversing the motor command direction signals and for reversing the counting direction of the function generator counters and the distance counters; and d. logic means for automatically ending the backup mode of operation when the difference between the number in the function generator first counter and the number in the first register equals a predetermined number or when the difference between the number in the function generator second counter and the number in the second register equals said predetermined number.
References Cited (Backward Citations)
US3523230A
Cited
US3802622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |