US4608758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error correction system for measuring instrument
Assignee: Dr Johannes Heidenhain GmbH
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Filing: 1984-02-27
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Granted: 1986-09-02
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Expires: 2004-02-27
Abstract
Abstract A measuring system includes a measuring graduation and scanning unit which scans the measuring graduation. The scanning unit and the measuring graduation are connected to respective ones of two objects, the position of which is to be measured. An error correction system which includes an error correction profile is provided for the correction of errors such as graduation errors and/or machine errors. The position of the correction profile is adjustable transversely to the measuring direction by means of eccentrics. Each of the eccentrics defines an index mark which is used with an error correction scale to indicate the position of the eccentric and therefore the deflection of the correction profile. In order to facilitate reproduceable error correction, the index marks are each defined by a respective index mark carrier which is mounted to the eccentric in an adjustable manner such that the index marks can be repositioned to define any arbitrary orientation of the eccentrics as a new zero position.
Inventors
- 👤 Karl-Hermann Voelk
- 👤 Karl-Heinz Wehrstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:49
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/347; G01D5/34746; G01D5/34753; G01B; G01B5/00; G01B5/0011
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
In a measuring system of the type comprising a measuring scale coupled to a first object and extending along a measuring direction; a scanning unit positioned to scan the scale and coupled to a second object; and an error correction system comprising an error correction profile, at least one adjusting element for adjusting the position of the correction profile transversely to the measuring direction, a transfer element coupled between the scanning unit and the second object to vary the spacing therebetween in response to the profile, and an error correction scale positioned adjacent to the adjusting element; wherein the adjusting element moves with respect to the error correction scale during adjustment of the position of the correction profile; the improvement comprising: an index mark carrier which defines an index mark that cooperates with the error correction scale to indicate the position of the adjusting element; and means for adjustably mounting the index mark carrier to the adjusting element such that the relative position of the index mark carrier with respect to the adjusting element can be varied.
Claim 2
Dependent Claim
177 words
In a measuring system of the type comprising a measuring scale coupled to a first object and extending along a measuring direction; a scanning unit positioned to scan the scale and coupled to a second object; and an error correction system comprising an error correction profile, at least one adjusting element for adjusting the position of the correction profile transversely to the measuring direction, a transfer element coupled between the scanning unit and the second object to vary the spacing therebetween in response to the profile, and an error correction scale positioned adjacent to the adjusting element; wherein the adjusting element moves with respect to the error correction scale during adjustment of the position of the correction profile; the improvement comprising: an index mark carrier which defines an index mark that cooperates with the error correction scale to indicate the position of the adjusting element; and means for adjustably mounting the index mark carrier to the adjusting element such that the relative position of the index mark carrier with respect to the adjusting element can be varied.
Claim 3
Dependent Claim
44 words
The invention of claim 1 wherein the index mark carrier comprises an annular ring and wherein the index mark carrier mounting means comprises means for defining a conical annular groove in the adjusting element, said groove sized to receive and clamp the annular ring.
Claim 4
Dependent Claim
29 words
The invention of claim 1 wherein the index mark carrier comprises an annular disc, and wherein the index mark carrier mounting means comprises an adhesive layer on the disc.
Claim 5
Dependent Claim
78 words
The invention of claim 1: wherein the error correction scale defines a reference line; and wherein the index mark carrier mounting means allows the index mark carrier to be shifted with respect to the adjusting member in order to allow the index mark to be aligned with the reference line, independently of the position of the adjusting member, in order to designate any selected one of a range of positions of the adjusting member as a reference position.
Claim 6
Dependent Claim
136 words
The invention of claim 1: wherein the adjusting element comprises a first disc member mounted to the measuring system for rotation about a selected axis such that rotational adjustment of the adjusting member alters the position of the correction profile transversely to the measuring direction; wherein the index mark carrier comprises a second disc member; wherein the error correction scale defines a reference line; and wherein the index mark carrier mounting means allows the second disc member to be rotated about the selected axis independently of the first disc member in order to allow the index mark to be aligned with the reference line, independently of the rotational position of the first disc member, in order to designate any selected one of a range of rotational positions of the first disc member as a reference position.
Claim 7
Dependent Claim
225 words
In a measuring system of the type comprising a measuring scale coupled to a first object and extending along a measuring direction; a scanning unit positioned to scan the scale and coupled to a second object; and an error correction system comprising means for adjusting the separation between the scanning unit and the second object; the improvement comprising: an error correction scale mounted to the measuring system and defining a reference line; an adjusting disc; means for mounting the adjusting disc to the measuring system for rotation about a selected axis; means for coupling the adjusting disc to the separation adjusting means such that rotation of the adjusting disc about the selected axis alters the separation between the scanning unit and the second object; an index mark carrier disc which defines an index mark; and means for rotatably mounting the index mark carrier disc to the adjusting disc such that the index mark carrier disc is rotatable about the selected axis independently of the adjusting disc; said index mark positioned to cooperate with the error correction scale to indicate the relative angular position of the index mark; and said index mark alignable with the reference line, independently of the angular position of the adjusting disc, in order to designate any selected one of a range of positions of the adjusting member as a reference position.
Claim 8
Dependent Claim
225 words
In a measuring system of the type comprising a measuring scale coupled to a first object and extending along a measuring direction; a scanning unit positioned to scan the scale and coupled to a second object; and an error correction system comprising means for adjusting the separation between the scanning unit and the second object; the improvement comprising: an error correction scale mounted to the measuring system and defining a reference line; an adjusting disc; means for mounting the adjusting disc to the measuring system for rotation about a selected axis; means for coupling the adjusting disc to the separation adjusting means such that rotation of the adjusting disc about the selected axis alters the separation between the scanning unit and the second object; an index mark carrier disc which defines an index mark; and means for rotatably mounting the index mark carrier disc to the adjusting disc such that the index mark carrier disc is rotatable about the selected axis independently of the adjusting disc; said index mark positioned to cooperate with the error correction scale to indicate the relative angular position of the index mark; and said index mark alignable with the reference line, independently of the angular position of the adjusting disc, in order to designate any selected one of a range of positions of the adjusting member as a reference position.
Claim 9
Dependent Claim
46 words
The invention of claim 6 wherein the index mark carrier disc comprises an annular ring and wherein the index mark carrier disc mounting means comprises means for defining a conical annular groove in the adjusting disc, said groove sized to receive and clamp the annular ring.
Claim 10
Dependent Claim
31 words
The invention of claim 6 wherein the index mark carrier disc comprises an annular disc, and wherein the index mark carrier disc mounting means comprises an adhesive layer on the disc.
References Cited (Backward Citations)
DE3136981C1
Cited
US4430799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |