US3891835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for a balance correcting machine
Assignee: Komatsu Ltd
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Filing: 1972-05-26
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Granted: 1975-06-24
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Expires: 1992-05-26
Abstract
Abstract A control system for a balance correcting machine having a cutter slide with a cutter mounted on a cutter spindle for machining a workpiece, such as a connecting rod for a diesel engine, in which an unbalance detecting mechanism provided in the cutter slide detects the unbalance of a workpiece when coming into contact with the surface to be corrected of the workpiece as the cutter slide advances, and a comparator compares this detected unbalance with the predetermined value of the unbalance provided by a balance measuring instrument and produces a control signal for controlling the cutter slide to determine the accurate correcting position.
Inventors
- 👤 Hiroshi Shoda
- 👤 Mikio Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:27
CPC Classifications
G; G01; G01M; G01M1/00; G01M1/30; G01M1/34; F; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10T; Y10T408/00; Y10T408/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
263 words
A control system for a balance correcting machine having a laterally advanceable cutter slide with a cutter mounted on a cutter spindle for machining a workpiece, comprising first means associated with the cutter slide for producing a first analog output signal when coming into contact with the to-be-machined surface of the workpiece as the cutter slide advances, said first analog output signal being indicative of the position of the cutter slide relative to said surface, second means for providing a second analog output signal indicative of the predetermined value of the unbalance of the workpiece prior to machining, third means for comparing the first analog output signal with the second analog output signal to produce a control signal, said third means including an amplifier for amplifying said first analog signal, an output voltage regulator for regulating the voltage of the amplified first analog signal, a firs A-D converter for converting the amplified first analog signal into a first digital signal, a first gate for selectively passing the first digital signal therethrough, a digital counter for presetting the first digital signal passed through said first gate, a second A-D converter for converting the second analog signal into a second digital signal, and a comparator for comparing said first digital signal of said first means preset in said digital counter with said second digital signal of said second means to produce a control signal and fourth means for controlling the cutter slide in accordance with the control signal to determine the proper correcting position of the cutter for machining said workpiece to the desired balance.
Claim 2
Dependent Claim
263 words
A control system for a balance correcting machine having a laterally advanceable cutter slide with a cutter mounted on a cutter spindle for machining a workpiece, comprising first means associated with the cutter slide for producing a first analog output signal when coming into contact with the to-be-machined surface of the workpiece as the cutter slide advances, said first analog output signal being indicative of the position of the cutter slide relative to said surface, second means for providing a second analog output signal indicative of the predetermined value of the unbalance of the workpiece prior to machining, third means for comparing the first analog output signal with the second analog output signal to produce a control signal, said third means including an amplifier for amplifying said first analog signal, an output voltage regulator for regulating the voltage of the amplified first analog signal, a firs A-D converter for converting the amplified first analog signal into a first digital signal, a first gate for selectively passing the first digital signal therethrough, a digital counter for presetting the first digital signal passed through said first gate, a second A-D converter for converting the second analog signal into a second digital signal, and a comparator for comparing said first digital signal of said first means preset in said digital counter with said second digital signal of said second means to produce a control signal and fourth means for controlling the cutter slide in accordance with the control signal to determine the proper correcting position of the cutter for machining said workpiece to the desired balance.
Claim 3
Dependent Claim
157 words
The system as set forth in claim 1, wherein said first means comprises an unbalance detecting mechanism provided in the cutter slide and including a connecting rod which projects from the side of the cutter slide, a detecting head provided at the leading end of said connectng rod biased at all times in the projecting direction by the action of a spring, and a differential transformer for generating an electromotive force having an actuating part connecting in parallel with the cutter spindle to the non-leading end of said connecting rod, the electromotive force of said differential transformer being preset at zero when the leading end of the cutter becomes flush with that of said detecting head and the characteristics of the output gradient being adjusted so that the relationship between the travel of the cutter and the corresponding weight of the workpiece traversed thereby coincides with the relationship between the travel and the output of the transformer.
Claim 4
Dependent Claim
38 words
The system as set forth in claim 1, wherein said second means is a balance measuring instrument for providing said third means with the second analog output signal indicative of the value of the unbalance of the workpiece.
Claim 5
Dependent Claim
162 words
The system as set forth in claim 1, wherein said fourth means comprises a pulse oscillator for generating a pulse signal according to the starting command of the balance correcting machine, second and third gates for passing a pulse signal of said pulse oscillator, a pulse motor for controlling said cutter slide actuated by a pulse signal passed through said second and third gates, a memory for memorizing a predetermined travel limit of said cutter slide and for closing said second gate thereby stopping said pulse motor, a timer for opening said first gate of said third means thereby passing the first digital signal of said first means to said digital counter and for simultaneously opening said third gate thereby passing a pulse signal to said pulse motor as a retracting signal for rEtracting said cutter slide, a phase inverter for subtracting pulse by pulse said retracting signal from said first digital signal of said first means preset in said digital counter.
Claim 6
Dependent Claim
66 words
The system as set forth in claim 4, wherein said fourth means further comprises a fourth gate for passing the retracting pulse signal from the third gate to said pulse motor, said comparator generating a coincidence signal to close the fourth gate to stop said pulse motor when the value of the pulse-subtracted digital signal in said digital counter becomes equal to said second digital signal.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |