US4564911A
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Method of monitoring a cutting tool by recognizing a sensed deviation in a mathematically smoothed function of force
Assignee: Eaton Corp
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Filing: 1983-04-25
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Granted: 1986-01-14
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Expires: 2003-04-25
Abstract
Abstract A method of monitoring the performance of a cutting tool which moves relative to a workpiece through a cycle includes the steps of dividing the cycle into a plurality of increments, sensing a function of force applied to the tool during the increments, mathematically smoothing the function of force sensed during the increments, and establishing a trend in the mathematically smoothed function of force for the plurality of increments. The mathematically smoothed function of force is compared with the established trend and if the mathematically smoothed function of force deviates substantially from the established trend a first signal is generated.
Inventors
- 👤 Stanley K. Smith
- 👤 Donald J. Rozsi
- 👤 Alvin M. Sabroff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:21
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/406; G05B19/4065; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37233; G05B2219/37344; G05B2219/37499; G05B2219/37525; G05B2219/37542; G05B2219/37543
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
163 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle comprising the steps of: dividing said cycle into a plurality of increments; sensing a function of the force applied to said tool during a plurality of said increments of said cycle; mathematically smoothing said function of force sensed during said plurality of sensed increments of said cycle; establishing a trend in the mathematically smoothed function of force for said plurality of sensed increments of said cycle; determining whether the mathematically smoothed function of force for subsequently sensed increments of said cycle deviates substantially from the established trend in the mathematically smoothed function of force for previously sensed increments of said cycle; and generating a first signal in response to sensing a substantial deviation in the mathematically smoothed function of force for subsequently sensed increments of said cycle from the established trend in the mathematically smoothed function of force for previously sensed increments of such cycle.
Claim 2
Independent Claim
163 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle comprising the steps of: dividing said cycle into a plurality of increments; sensing a function of the force applied to said tool during a plurality of said increments of said cycle; mathematically smoothing said function of force sensed during said plurality of sensed increments of said cycle; establishing a trend in the mathematically smoothed function of force for said plurality of sensed increments of said cycle; determining whether the mathematically smoothed function of force for subsequently sensed increments of said cycle deviates substantially from the established trend in the mathematically smoothed function of force for previously sensed increments of said cycle; and generating a first signal in response to sensing a substantial deviation in the mathematically smoothed function of force for subsequently sensed increments of said cycle from the established trend in the mathematically smoothed function of force for previously sensed increments of such cycle.
Claim 3
Dependent Claim
55 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said step of establishing a trend in the mathematically smoothed function of force comprises establishing a substantially linear trend in the mathematically smoothed function of force for a plurality of increments.
Claim 4
Dependent Claim
56 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said step of establishing a trend in the mathematically smoothed function of force includes the step of sensing the gradient for the mathematically smoothed function of force for a plurality of increments.
Claim 5
Dependent Claim
126 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 3 wherein the step of sensing the gradient for the mathematically smoothed function of force includes the steps of; sensing the minimum gradient for the mathematically smoothed function of force previously sensed for the previously sensed increments; comparing the gradient of the actual determined mathematicaly smoothed function of force for a particular increment with the sensed minimum gradient for the mathematically smoothed function of force; and establishing a third signal if the actual gradient of the mathematically smoothed function of force for that particular increment is greater than a set multiple of the minimum gradient previously sensed for the mathematically smoothed function of force.
Claim 6
Dependent Claim
34 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 4 wherein said third signal is indicative of a nonproperly performing tool.
Claim 7
Dependent Claim
124 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 3 wherein the step of sensing the gradient for the mathematically smoothed function of force includes the steps of: sensing the maximum gradient for the mathematically smoothed function of force previously sensed for the previously sensed increments; comparing the gradient of the mathematically smoothed function of force for a particular increment with the previously sensed maximum gradient for the mathematically smoothed function of force; and establishing a third signal if the gradient of the actual mathematically smoothed function of force for particular increment is less than a set multiple of the previously sensed maximum gradient for the mathematically smoothed function of force.
Claim 8
Dependent Claim
111 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 further including the steps of: setting a maximum value for the mathematically smoothed function of force for each sensed individual increment; comparing the actual determined mathematically smoothed function of force for each sensed individual increment with the set maximum value for the mathematically smoothed function of force for that particular increment; and establishing a second signal if the actual determined mathematically smoothed function of force for a particular individual increment is larger than the set maximum value for the mathematically smoothed function of force for that particular increment.
Claim 9
Dependent Claim
35 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 7 wherein said second signal is indicative of a non properly performing tool.
Claim 10
Dependent Claim
130 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 7 further including the steps of: setting a high warning value for the mathematically smoothed function of force for each sensed increment which is less than the maximum set value for the mathematically smoothed function of force for that particular increment; comparing the set high warning value for the mathematically smoothed function of force for a particular increment with the actual determined mathematically smoothed function of force for that particular increment; and establishing a fourth signal if the set high warning value for the mathematically smoothed function of force for a particular increment is exceeded by the actual determined mathematically smoothed function of force for that particular increment.
Claim 11
Dependent Claim
77 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said first signal has a first characteristic if the deviation from the established trend in the mathematically smoothed function of force is a deviation in a positive direction and a second characteristic if the deviation from the established trend in the mathematically smoothed function of force is a deviation in a negative direction.
Claim 12
Dependent Claim
45 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said step of sensing a function of the force applied to said tool comprises sensing the torque applied to said tool.
Claim 13
Dependent Claim
45 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said step of sensing a function of the force applied to said tool comprises sensing the thrust applied to said tool.
Claim 14
Dependent Claim
46 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said step of sensing a function of the force applied to said tool comprises sensing the separation force applied to said tool.
Claim 15
Dependent Claim
31 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said tool rotates relative to said workpiece.
Claim 16
Dependent Claim
32 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 1 wherein said tool moves linearly relative to said workpiece.
Claim 17
Independent Claim
207 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle comprising the steps of: dividing said cycle into a plurality of increments; sensing a function of the force applied to said tool during a plurality of said increments of said cycle; mathematically smoothing said function of force sensed during said plurality of sensed increments of said cycle; establishing a trend in the mathematically smoothed function of force for said plurality of sensed increments of said cycle; determining whether the mathematically smoothed function of force for subsequently sensed increments of said cycle deviates substantially from the established trend in the mathematically smoothed function of force for previously sensed increments of said cycle; and generating a first signal in response to sensing a substantial deviation in the mathematically smoothed function of force for subsequently sensed increments of said cycle from the established trend in the mathematically smoothed function of force for previously sensed increments of said cycle; wherein said step of mathematically smoothing said function of force includes the steps of determining the cumulative percentage deviation for the function of force during each sensed increment of said cycle; and determining a cumulative percentage deviation data point for each sensed individual increment.
Claim 18
Independent Claim
207 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle comprising the steps of: dividing said cycle into a plurality of increments; sensing a function of the force applied to said tool during a plurality of said increments of said cycle; mathematically smoothing said function of force sensed during said plurality of sensed increments of said cycle; establishing a trend in the mathematically smoothed function of force for said plurality of sensed increments of said cycle; determining whether the mathematically smoothed function of force for subsequently sensed increments of said cycle deviates substantially from the established trend in the mathematically smoothed function of force for previously sensed increments of said cycle; and generating a first signal in response to sensing a substantial deviation in the mathematically smoothed function of force for subsequently sensed increments of said cycle from the established trend in the mathematically smoothed function of force for previously sensed increments of said cycle; wherein said step of mathematically smoothing said function of force includes the steps of determining the cumulative percentage deviation for the function of force during each sensed increment of said cycle; and determining a cumulative percentage deviation data point for each sensed individual increment.
Claim 19
Dependent Claim
81 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 16 wherein said step of determining a cumulative percentage deviation data point for each sensed individual increment includes determining the cumulative percentage deviation data point for a particular individual increment by adding the absolute value of the percent deviation for that particular increment to the sum of the absolute values of the percent deviation for the previously sensed increments.
Claim 20
Dependent Claim
56 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 16 wherein said step of establishing a trend in the mathematically smoothed function of force includes the step of sensing the gradient for the cumulative percentage deviation data points for a plurality of increments.
Claim 21
Dependent Claim
76 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 18 wherein said step of sensing the gradient of the cumulative percentage deviation data points includes the step of: determining whether the gradient of the cumulative percentage deviation data points in a particular increment deviates substantially from the established trend in the gradient of the cumulative percentage deviation data points for previously sensed increments.
Claim 22
Dependent Claim
147 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 19 wherein said step of determining whether the gradient of the cumulative percentage deviation data points deviates substantially from the established trend in the gradient of the cumulative percentage deviation data points includes the steps of: sensing the minimum gradient of the cumulative percentage deviation data points previously sensed for the previously sensed increments; comparing the gradient of the actual determined cumulative percentage deviation data points for a particular increment with the previously sensed minimum gradient for the previously sensed cumulative percentage deviation data points; and establishing a third signal if the gradient of the actual determined cumulative percentage deviation data points for that particular increment is greater than a set multiple of the minimum gradient previously sensed for the cumulative percentage deviation data points.
Claim 23
Dependent Claim
35 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 20 wherein said third signal is indicative of a non properly performing tool.
Claim 24
Dependent Claim
145 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 19 wherein said step of determining whether the gradient of the cumulative percentage deviation data points deviates substantially from the established trend in the gradient of the cumulative percentage deviation data points includes the steps of: sensing the maximum gradient of the cumulative percentage deviation data points previously sensed for the previously sensed increments; comparing the gradient of the actual determined cumulative percentage deviation data point for a particular increment with the previously sensed maximum gradient for the cumulative percentage deviation data points; and establishing a third signal if the gradient of the actual determined cumulative percentage deviation data points for that particular increment is less than a set multiple of the maximum gradient previously sensed for the cumulative percentage deviation data points.
Claim 25
Dependent Claim
110 words
A method monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 22 further including the steps of; sensing the minimum gradient of the cumulative percentage deviation data points previously sensed for the previously sensed increments; comparing the gradient for the cumulative percentage deviation data points for a particular increment with the previously sensed minimum gradient of the cumulative percentage deviation data points; and establishing a fourth signal if the gradient of the actual determined cumulative percentage deviation data points for a particular increment is less than a set multiple of the cumulative percentage deviation data points for that particular increment.
Claim 26
Dependent Claim
110 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 16 further including the steps of: setting a maximum value for the cumulative percentage deviation data point for each sensed individual increment; comparing the actual determined cumulative percentage deviation data point for each sensed individual increment with the set maximum value for the cumulative percentage deviation data point for that particular increment; and establishing a second signal if the actual determined cumulative percentage deviation data point for that particular increment is larger than the set maximum value for the cumulative percentage deviation data point for that particular increment.
Claim 27
Dependent Claim
34 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 24 wherein said second signal is indicative of a nonproperly performing tool.
Claim 28
Dependent Claim
130 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 24 further including the steps of: setting a high warning value for the cumulative percentage deviation data points for each sensed increment which is less than the maximum set value for the cumulative percentage deviation data point for that particular increment; comparing the set high warning value for the cumulative percentage deviation data point for a particular increment with the actual determined cumulative percentage deviation data point for that particular increment; and establishing a fourth signal if the set high warning value for the cumulative percentage deviation data point for a particular increment is exceeded by the actual determined cumulative percentage deviation data point for that particular increment.
Claim 29
Dependent Claim
77 words
A method of monitoring the performance of a tool which moves relative to a workpiece through a cycle as defined in claim 16 wherein said first signal has a first characteristic if the deviation from the established trend in the cumulative percentage deviation data points is a deviation in a positive direction and a second characteristic if the deviation from the established trend in the cumulative percentage deviation data points is a deviation in a negative direction.
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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) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |