US3770947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool control
Assignee: CITY NAT BANK OF DETROIT
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Filing: 1971-08-20
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Granted: 1973-11-06
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Expires: 1991-08-20
Abstract
Abstract System for control of tool drive with respect to at least X and Y axes to trace a first path segment and to approach a second path segment (e.g., for tool offset, or to trace an inscribed curve tangent to the two path segments), by steps comprising storage of data descriptive of X and Y positions corresponding to current X and Y tool positions and of a first function the value of which is dependent upon the perpendicular distance from the X and Y positions to the second path segment, updating of the stored data upon advance of the drive during the tracing of the first path segment, and interruption of the tracing of the first path segment when the function assumes a predetermined value.
Inventors
- 👤 D Deily
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:23
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/41; G05B19/4103; G05B2219/00; G05B2219/30; G05B2219/33; G05B2219/33099; G05B2219/34; G05B2219/34098; G05B2219/50; G05B2219/50289; G05B2219/50313; G05B2219/50334; G05B2219/50336
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A method for control of a tool drive with respect to at least X and Y axes to trace a first path segment and to approach a second path segment, by steps comprising storage of data descriptive of X and Y positions corresponding to current X and Y tool positions and of a first function the value of which is dependent upon the perpendicular distance from said X and Y positions to said second path segment, updating of the stored data upon advance of said drive during the tracing of said first path segment, and interruption of the tracing of said first path segment when said function assumes a predetermined value different from zero.
Claim 2
Independent Claim
114 words
A method for control of a tool drive with respect to at least X and Y axes to trace a first path segment and to approach a second path segment, by steps comprising storage of data descriptive of X and Y positions corresponding to current X and Y tool positions and of a first function the value of which is dependent upon the perpendicular distance from said X and Y positions to said second path segment, updating of the stored data upon advance of said drive during the tracing of said first path segment, and interruption of the tracing of said first path segment when said function assumes a predetermined value different from zero.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said predetermined value corresponds to a desired tool offset for said second path segment, and said X and Y positions are said current tool positions.
Claim 4
Dependent Claim
60 words
The method of claim 1 wherein said X and Y positions are pseudo tool positions on a pseudo path segment parallel to said first path segment and intersecting the center of an inscribed curve to be traced tangent to said first and second path segments, and said predetermined value corresponds to the distance between said first and pseudo path segments.
Claim 5
Dependent Claim
30 words
The method of claim 3 wherein said inscribed curve is a circular arc, and said pseudo path segment is spaced from said first path by the radius of said arc.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein said tracing of said first path segment is interrupted when the value of said function changes its algebraic sign.
Claim 7
Dependent Claim
80 words
The method of claim 1 wherein the stored value of said function is updated according to the following table, where said second path segment is a line segment between points (X1, Y1) and (X2, Y2), and said function is of the form H Delta X.Y Delta Y.X + (X1.Y2-X2.Y1), where Delta X X2-X1 and Delta Y Y2-Y1: UNIT DRIVE ADVANCE VALUE OF H UPDATING +X - Delta Y +Y + Delta X -X + Delta Y -Y - Delta X
Claim 8
Dependent Claim
72 words
The method of claim 1 wherein the stored value of said function is updated according to the following table, where said second path segment is a circular arc having a center (XC, YC) and endpoints (X1, Y1), (X2, Y2), and said function is of the form H (X-XC)2 + (Y-YC)2: UNIT DRIVE ADVANCE VALUE OF H UPDATING +X +2(X-XC) + 1 +Y +2(Y-YC) +1 -X -2(X-XC) + 1 -Y -2(Y-YC) + 1
Claim 9
Dependent Claim
81 words
The method of claim 1, said steps further comprising storage of additional data descriptive of a second function the value of which is dependent upon the perpendicular distance from current tool position to said first path segment, updating of the additional stored data upon advance of said drive during the tracing of said first path segment, and control of said advance so that the value of said second function tends toward a predetermined constant value corresponding to a desired tool offset.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |