US4855923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parts assembly using signature analysis
Assignee: Xerox Corp
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Filing: 1988-01-06
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Granted: 1989-08-08
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Expires: 2008-01-06
Abstract
Abstract A method of assembling parts in which, before actual assembly of the parts, the forces associated with a good assembly of parts and the forces associated with a faulty assembly of parts are identified to train a pattern of recognition signature analysis system. During assembly, the forces required to actually assemble the parts are measured and a determination is made by the system as to whether these forces are associated with a good assembly or a faulty assembly to determine if the assembled part should be accepted or rejected.
Inventors
- 👤 David M. Fullmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:36
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/22; B; B23; B23P; B23P19/00; G05; G05B; G05B19/00; G05B19/02; G05B19/418; G05B19/41875; G05B2219/00; G05B2219/30; G05B2219/50; G05B2219/50073; Y; Y02; Y02P; Y02P90/00; Y02P90/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A method of assembling parts, including the steps of: sensing, at discrete time intervals before actual assembly of the parts, forces exerted on the parts corresponding to a good assembly and a faulty assembly; processing statistically the sensed forces to determine waveforms corresponding to the forces associated with a good assembly and the forces associated with a faulty assembly; detecting, at discrete time intervals, forces exerted on the parts during the actual assembly of the parts; processing statistically the detected forces to determine waveforms of the forces used during actual assembly of the parts; comparing the waveforms of the forces used during actual assembly of the parts to the waveforms corresponding to the forces associated with a good assembly and a faulty assembly to classify the waveforms of the forces used during actual assembly of the parts as those associated with a good assembly or those associated with a faulty assembly.
Claim 2
Independent Claim
151 words
A method of assembling parts, including the steps of: sensing, at discrete time intervals before actual assembly of the parts, forces exerted on the parts corresponding to a good assembly and a faulty assembly; processing statistically the sensed forces to determine waveforms corresponding to the forces associated with a good assembly and the forces associated with a faulty assembly; detecting, at discrete time intervals, forces exerted on the parts during the actual assembly of the parts; processing statistically the detected forces to determine waveforms of the forces used during actual assembly of the parts; comparing the waveforms of the forces used during actual assembly of the parts to the waveforms corresponding to the forces associated with a good assembly and a faulty assembly to classify the waveforms of the forces used during actual assembly of the parts as those associated with a good assembly or those associated with a faulty assembly.
Claim 3
Dependent Claim
45 words
A method according to claim 1, wherein said step of processing the sensed forces includes the step of employing a maximum likelihood statistical technique to form the waveforms corresponding to the forces associated with a good assembly and the forces associated with a faulty assembly.
Claim 4
Dependent Claim
38 words
A method according to claim 2, wherein said step of processing the detected forces includes the step of employing a maximum likelihood statistical technique to form the waveform of the actual forces used during assembly of the parts.
Claim 5
Dependent Claim
33 words
A method according to claim 3, further including the step of assembling the parts with an assembly robot having an end effector for holding the parts with a plurality of degrees of motion.
Claim 6
Dependent Claim
36 words
A method according to claim 4, wherein said step of processing statistically the sensed forces and said step of processing statistically the detected forces includes the step of using a computer to perform the required computations.
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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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |