Patent US4612709A successfully refreshed from Google Patents.
US4612709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring positional movement of a numerically controlled machine tool
Assignee: Siemens AG
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Filing: 1985-07-09
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Granted: 1986-09-23
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Expires: 2005-07-09
Abstract
Abstract An apparatus for measuring the positional movement of a movable workpiece of a numerically controlled machine tool. The apparatus comprises an incremental linear measuring system arranged along the path of movement of the movable workpiece, a rotary measuring system, mechanically coupled to a drive of the movable workpiece, and means within the computer control of the machine tool to relate the resulting measurements from the two systems to one another. The measuring resolution of the rotary measuring system is substantially greater than that of the incremental linear measuring system such that if the rotary measuring system is subordinated to the incremental linear measuring system, the machine tool can achieve greater control accuracy with respect to stopping and positioning the workpiece. The apparatus can also be configured to measure characteristics of the machine tool such as spindle pitch, spindle pitch error, and backlash and correct any control inaccuracies accordingly.
Inventors
- 👤 Roderich Baisch
- 👤 Horst Gose
- 👤 Wolfgang Papiernik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:05
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/39; G01; G01D; G01D18/00; G01D18/001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
An apparatus for measuring positional movement of a movable workpiece of a machine tool, comprising: (a) direct position measuring means, arranged along the path of movement of the movable workpiece; (b) indirect position measuring means, mechanically coupled to a drive of the movable workpiece and having a measuring resolution at least four times greater than the measuring resolution of said direct position measuring means; and (c) means for relating resulting measurement values of both position measuring means with each other and for automatically determining spindle pitch and spindle pitch error of a spindle coupled to the drive so that the control accuracy of the machine tool can be improved.
Claim 2
Independent Claim
109 words
An apparatus for measuring positional movement of a movable workpiece of a machine tool, comprising: (a) direct position measuring means, arranged along the path of movement of the movable workpiece; (b) indirect position measuring means, mechanically coupled to a drive of the movable workpiece and having a measuring resolution at least four times greater than the measuring resolution of said direct position measuring means; and (c) means for relating resulting measurement values of both position measuring means with each other and for automatically determining spindle pitch and spindle pitch error of a spindle coupled to the drive so that the control accuracy of the machine tool can be improved.
Claim 3
Dependent Claim
33 words
An apparatus as recited in claim 1 wherein the measuring resolution of the indirect position measuring means is at least ten times greater than the measuring resolution of the direct position measuring means.
Claim 4
Dependent Claim
21 words
An apparatus as recited in claim 1 wherein the indirect position measuring means is subordinated to the direct position measuring means.
Claim 5
Independent Claim
97 words
An apparatus for measuring positional movement of a movable workpiece of a machine tool, comprising: (a) direct position measuring means, arranged along the path of movement of the movable workpiece; (b) indirect position measuring means, mechanically coupled to a drive of the movable workpiece and having a measuring resolution at least four times greater than the measuring resolution of said direct position measuring means; and (c) means for relating resulting measurement values of both position measuring means with each other and for automatically measuring and correcting reversal backlash between the indirect measuring means and the movable workpiece.
Claim 6
Independent Claim
97 words
An apparatus for measuring positional movement of a movable workpiece of a machine tool, comprising: (a) direct position measuring means, arranged along the path of movement of the movable workpiece; (b) indirect position measuring means, mechanically coupled to a drive of the movable workpiece and having a measuring resolution at least four times greater than the measuring resolution of said direct position measuring means; and (c) means for relating resulting measurement values of both position measuring means with each other and for automatically measuring and correcting reversal backlash between the indirect measuring means and the movable workpiece.
Claim 7
Dependent Claim
33 words
An apparatus as recited in claim 4 wherein the measuring resolution of the indirect position measuring means is at least ten times greater than the measuring resolution of the direct position measuring means.
Claim 8
Dependent Claim
21 words
An apparatus as recited in claim 4 wherein the indirect position measuring means is subordinated to the direct position measuring means.
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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |