US3612840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear error compensator for numerically controlled machine tools
Assignee: Kearney and Trecker Corp
•
Filing: 1969-09-08
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Granted: 1971-10-12
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Expires: 1989-09-08
Abstract
Abstract Within a pulse-counting numerical control system for a machine tool, a signal modifier is connected to effect the addition or subtraction of a predetermined number of pulses to the control system to compensate for repeatable linear errors that may appear in the machine''s slidable members.
Inventors
- 👤 Richard E Stobbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:42
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/35; G05B19/351; G05B19/353; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41036; G05B2219/41309; G05B2219/41461; G05B2219/49; G05B2219/49169; G05B2219/49219
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
In a machine tool having a movable member; drive means connected to effect relative positioning movement of said member; a positioning control system including a source of control pulses individually representative of uniform increments of movement and being operable to regulate the operation of said drive means to effect accurate positioning of said member; an error compensator control operable to transmit a compensating signal to said numerical control system for modifying the number of said control pulses to compensate for positioning errors due to inaccUracies in the machine structure; first means in said error compensation control for producing a plurality of pulse trains with each train providing a different number of compensating pulses; and second means in said error compensation control to select one of said pulse trains for insertion into said control system at a predetermined position of said movable member to compensate for a predetermined inaccuracy of the machine at that position.
Claim 2
Dependent Claim
154 words
In a machine tool having a movable member; drive means connected to effect relative positioning movement of said member; a positioning control system including a source of control pulses individually representative of uniform increments of movement and being operable to regulate the operation of said drive means to effect accurate positioning of said member; an error compensator control operable to transmit a compensating signal to said numerical control system for modifying the number of said control pulses to compensate for positioning errors due to inaccUracies in the machine structure; first means in said error compensation control for producing a plurality of pulse trains with each train providing a different number of compensating pulses; and second means in said error compensation control to select one of said pulse trains for insertion into said control system at a predetermined position of said movable member to compensate for a predetermined inaccuracy of the machine at that position.
Claim 3
Dependent Claim
54 words
A machine tool according to claim 1, wherein said second means provides for the selection of any one of said pulse trains for insertion into said control system at different positions of said movable member to effect the compensation through the entire range of movement of said movable member at predetermined intervals of movement.
Claim 4
Dependent Claim
35 words
A machine tool according to claim 1, wherein said compensating pulses serve to add or subtract pulses in said control system depending upon the type of correction required to improve the accuracy of the machine.
Claim 5
Dependent Claim
41 words
A machine tool according to claim 1, wherein said second means comprises a compensation selector matrix settable to select the desired pulse train for introduction into said control system upon completion of each predetermined increments of movement of said movable member.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |