US3766461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backlash compensation circuit for numerically controlled stepping motor driven machine
Assignee: Superior Electric Co
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Filing: 1971-10-04
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Granted: 1973-10-16
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Expires: 1991-10-04
Abstract
Abstract A circuit for use with a numerically controlled machine having lost motion or backlash between a moved part and a stepping motor which enables selection of (1) no backlash compensation, (2) backlash compensation by moving the part to each final position in the same direction or (3) backlash compensation by adding the exact amount of backlash each time the movement of the part is reversed. The circuit has a counter which in selection (2) adds and subtracts a movement greater than the actual backlash while in selection (3), the counter is set to provide the exact amount of backlash and also have its condition used to determine when backlash compensation is required.
Inventors
- 👤 A Leenhouts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:16
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41038; G05B2219/41081
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
256 words
A compensating system for use with a motor foR incrementally moving a machine part in either of two directions wherein there is backlash between the motor and the part, with the backlash being predeterminable as a number of incremental movements of the motor, for overcoming the backlash comprising means for commanding the motor to move the part a number of equal length increments in a selected direction and means for selecting one of three modes of backlash compensation consisting of a. no backlash compensation, b. backlash compensation for moving the part to each of its final commanded positions in the same direction, and c. backlash compensation by adding the predetermined motion to the commanded motion in the same direction as the commanded motion only when the commanded motion is reversed from the immediately preceding commanded motion, in which the system includes a counting means having means for providing a first signal when the counting means has a zero count, a second signal when the counting means has a predetermined count equal to the number of movements in the backlash and a third signal when the counting means has a greater count than the predetermined count and means for using the first and third signals for determining if backlash compensation is to be effected when mode b is selected and setting the extent of the backlash compensation and for using the first and second signals for determining if backlash compensation is to be effected when mode c is selected and setting the extent of the backlash compensation.
Claim 2
Dependent Claim
256 words
A compensating system for use with a motor foR incrementally moving a machine part in either of two directions wherein there is backlash between the motor and the part, with the backlash being predeterminable as a number of incremental movements of the motor, for overcoming the backlash comprising means for commanding the motor to move the part a number of equal length increments in a selected direction and means for selecting one of three modes of backlash compensation consisting of a. no backlash compensation, b. backlash compensation for moving the part to each of its final commanded positions in the same direction, and c. backlash compensation by adding the predetermined motion to the commanded motion in the same direction as the commanded motion only when the commanded motion is reversed from the immediately preceding commanded motion, in which the system includes a counting means having means for providing a first signal when the counting means has a zero count, a second signal when the counting means has a predetermined count equal to the number of movements in the backlash and a third signal when the counting means has a greater count than the predetermined count and means for using the first and third signals for determining if backlash compensation is to be effected when mode b is selected and setting the extent of the backlash compensation and for using the first and second signals for determining if backlash compensation is to be effected when mode c is selected and setting the extent of the backlash compensation.
Claim 3
Dependent Claim
63 words
The invention as defined in claim 1 in which the counting means is an up-down counter and in which there are means for causing said counting means to count up for each backlash compensating directed movement of the motor in one direction and to effectively count towards a zero count for each backlash compensating directed movement of the motor in the other direction.
Claim 4
Dependent Claim
40 words
The invention as defined in claim 2 in which the presence of the second signal indicating that the count of the counting means equals the selected count inhibits backlash compensating directed movement for a commanded movement in the one direction.
Claim 5
Dependent Claim
38 words
The invention as defined in claim 2 in which the presence of the first signal indicating that the count of the counting means is zero inhibits backlash compensating directed movement for a commanded movement in the other direction.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |