US3590670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine tool cutting indication and control
Assignee: General Electric Co
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Filing: 1969-03-24
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Granted: 1971-07-06
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Expires: 1989-03-24
Abstract
Abstract A high pass filter of particular characteristics is provided in the signal path from a vibration transducer attached to a machine tool to an indicator which enables the indicator to reliably indicate when the machine tool is performing a cutting operation.
Inventors
- 👤 Robert A Thompson
- 👤 Stephen E Grabkowski
- 👤 Raymond A Mathieu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:59
CPC Classifications
B; B23; B23Q; B23Q17/00; B23Q17/09; B23Q17/0952; B23Q17/0957; B23Q17/0904; B23Q17/0919; B23Q17/0928; B23Q17/22; B23Q17/2233; B23Q17/2241; G; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37351; Y; Y10; Y10S; Y10S82/00; Y10S82/904; Y10T; Y10T408/00; Y10T408/16; Y10T408/17; Y10T408/172; Y10T82/00; Y10T82/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
255 words
In combination with a machine tool which includes a workpiece holder and a cutting tool, motor means for moving the workpiece holder in relation to the cutting tool, and means for advancing the workpiece holder in relation to the cutting tool to bring a workpiece attached to the workpiece holder into engagement with the cutting tool for performing a machining operation on the workpiece apparatus for providing an indication of engagement of the cutting tool with the workpiece comprising an accelerometer physically attached to said machine tool for sensing mechanical vibrations therein and converting said vibrations into an electrical signal, amplifying means connected to said accelerometer for amplifying said signal, attenuating means connected to said amplifying means for attenuating the frequency components of said signal below a predetermined frequency, said components representing a substantial portion of the vibrations produced by said machine tool independent of any cutting operation being performed thereon whereby the predominant portion of the signal energy of the resultant signal corresponds to components produced on said machine tool by the machining operation, rectifier means connected to said attenuating means and responsive to a predetermined power level for providing a unidirectional voltage representative of the power level of said resultant signal, a switching circuit connected to the output of said rectifier means and responsive to a predetermined level of said unidirectional voltage to provide an output, an indicating device connected to said switching circuit and responsive to the output thereof to provide an indication of engagement of said cutting tool with said workpiece.
Claim 2
Dependent Claim
255 words
In combination with a machine tool which includes a workpiece holder and a cutting tool, motor means for moving the workpiece holder in relation to the cutting tool, and means for advancing the workpiece holder in relation to the cutting tool to bring a workpiece attached to the workpiece holder into engagement with the cutting tool for performing a machining operation on the workpiece apparatus for providing an indication of engagement of the cutting tool with the workpiece comprising an accelerometer physically attached to said machine tool for sensing mechanical vibrations therein and converting said vibrations into an electrical signal, amplifying means connected to said accelerometer for amplifying said signal, attenuating means connected to said amplifying means for attenuating the frequency components of said signal below a predetermined frequency, said components representing a substantial portion of the vibrations produced by said machine tool independent of any cutting operation being performed thereon whereby the predominant portion of the signal energy of the resultant signal corresponds to components produced on said machine tool by the machining operation, rectifier means connected to said attenuating means and responsive to a predetermined power level for providing a unidirectional voltage representative of the power level of said resultant signal, a switching circuit connected to the output of said rectifier means and responsive to a predetermined level of said unidirectional voltage to provide an output, an indicating device connected to said switching circuit and responsive to the output thereof to provide an indication of engagement of said cutting tool with said workpiece.
Claim 3
Dependent Claim
105 words
The combination of claim 1 in which a capacitor with a resistive discharge path is provided at the output of said rectifier means to receive charge passed through said rectifier means and provide a voltage indicative of the power level of said resultant signal, the time constant of the capacitor with resistive discharge path being sufficiently great to retain the voltage thereon above a predetermined switching level over a period of time greater than the period of time of successive short time interval engagements which a machine tool makes with the workpiece thereby to provide a constant indication of a machining operation being performed thereon.
References Cited (Backward Citations)
US3095532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |