US3757188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error correction for incremental plotter
Assignee: Cal Comp Inc
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Filing: 1972-01-12
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Granted: 1973-09-04
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Expires: 1992-01-12
Abstract
Abstract The difference between the desired and actual location of plotting stylus of an X-Y Incremental Plotter can be corrected by the selective addition or subtraction of pulses to the control circuitry. Where position feedback is employed, the correction can be effectuated by inhibiting either a command pulse or a feedback pulse.
Inventors
- 👤 H Brewer
- 👤 Cor Kindale K Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:33
CPC Classifications
G; G01; G01R; G01R17/00; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1445
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
An error correction system for an incremental plotting device having a stylus and wherein the X and Y axis of the plotting device are divided into a number of error correcting zones, comprising: a program card having at least one pair of connection points associated with each error zone, said connection points being arranged such that they can be jumpered or not jumpered depending upon whether positional modification is required, and; gating means associated with each pair of connection points for selecting the proper pair of connection points in accordance with the position of the stylus of said plotting device.
Claim 2
Dependent Claim
100 words
An error correction system for an incremental plotting device having a stylus and wherein the X and Y axis of the plotting device are divided into a number of error correcting zones, comprising: a program card having at least one pair of connection points associated with each error zone, said connection points being arranged such that they can be jumpered or not jumpered depending upon whether positional modification is required, and; gating means associated with each pair of connection points for selecting the proper pair of connection points in accordance with the position of the stylus of said plotting device.
Claim 3
Dependent Claim
98 words
An error correction system for an incremental plotter having a movable plotting head and a plotting surface divided into a plurality of error correction zones comprising: a program card having at least one pair of connection points associated with each error zone, said connection points being arranged such that they can be jumpered or not jumpered to provide stored error correction depending upon whether positional modification is required, and; gating means associated with each pair of connection points for selecting the proper pair of connection points in accordance with the position of the plotting head of said plotter.
Claim 4
Dependent Claim
98 words
An error correction system for an incremental plotter having a movable plotting head and a plotting surface divided into a plurality of error correction zones comprising: a program card having at least one pair of connection points associated with each error zone, said connection points being arranged such that they can be jumpered or not jumpered to provide stored error correction depending upon whether positional modification is required, and; gating means associated with each pair of connection points for selecting the proper pair of connection points in accordance with the position of the plotting head of said plotter.
Claim 5
Dependent Claim
74 words
The apparatus recited in claim 2 wherein is included: an up-down counter for each axis; means for loading said up-down counters with a number which corresponds to the number of increments of travel in each axis; servo means responsive to said up-down counters for positioning the plotting head; means for modifying the count in said up-down counter in accordance with the stored error correction data which corresponds to the position of said plotting head.
Claim 6
Dependent Claim
19 words
The system recited in claim 3 wherein is included: feedback means for determining the position of said plotting head.
Claim 7
Dependent Claim
14 words
The apparatus recited in claim 4 wherein said feedback means comprises a digital encoder.
Claim 8
Dependent Claim
20 words
The apparatus recited in claim 5 wherein is included: counter means for counting the index pulses generated by said encoder.
Claim 9
Dependent Claim
45 words
The apparatus recited in claim 6 wherein said means for selecting the stored error comprises: decoding means response to said counter means whereby the position of the plotting head and hence the requisite error correction data can be determined and applied to said up-down counter.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |