US3859760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for grinding machine
Assignee: JONES & LAMSON WATERBURY FARREL CORP A CORP OF DE
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Filing: 1972-12-21
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Granted: 1975-01-14
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Expires: 1992-12-21
Abstract
Abstract This disclosure relates to a system which continuously monitors and displays the distance between the cutting edge of a grinding wheel and a lower reference plane. A finish size of a workpiece may be set into the system and the grinding wheel is downfed in predetermined increments until the monitor distance equals the selected finish size.
Inventors
- 👤 Paul E Grieb
- 👤 Richard Sieradzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:33
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/35; G05B19/351; B; B24; B24B; B24B49/00; B24B49/18; G05B19/416; G05B19/4166; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37092; G05B2219/41; G05B2219/41326; G05B2219/45; G05B2219/45159; G05B2219/45161; G05B2219/49; G05B2219/49381; G05B2219/50; G05B2219/50313
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
214 words
A surface grinder comprising a wheelhead arranged to drive a grinding wheel, means for moving said wheel-head and wheel in elevation above a reference plane, means providing a first train of pulses, resolver means coupled to said means for moving for generating a second train of pulses at the same frequency as said first train, means for comparing the phase difference of the pulses of said first and second trains, means for providing a third train of pulses at a frequency substantially higher than pulses of said first and second trains proportional in number to the magnitude of the phase difference between pulses of said first and second trains and one direction of phase difference, and providing a fourth train of pulses of the same frequency as said third train proportional in magnitude to the magnitude of the phase difference between pulses of said first and second trains and the other direction of phase difference, pulse counting means for accumulating the difference in the number of the pulses of said third and fourth trains and establishing a numerical representation thereof, each of the pulses of said third and fourth trains representing an increment of distance between said wheel and said reference plane, and means for visually displaying the distance represented in said counting means.
Claim 2
Dependent Claim
214 words
A surface grinder comprising a wheelhead arranged to drive a grinding wheel, means for moving said wheel-head and wheel in elevation above a reference plane, means providing a first train of pulses, resolver means coupled to said means for moving for generating a second train of pulses at the same frequency as said first train, means for comparing the phase difference of the pulses of said first and second trains, means for providing a third train of pulses at a frequency substantially higher than pulses of said first and second trains proportional in number to the magnitude of the phase difference between pulses of said first and second trains and one direction of phase difference, and providing a fourth train of pulses of the same frequency as said third train proportional in magnitude to the magnitude of the phase difference between pulses of said first and second trains and the other direction of phase difference, pulse counting means for accumulating the difference in the number of the pulses of said third and fourth trains and establishing a numerical representation thereof, each of the pulses of said third and fourth trains representing an increment of distance between said wheel and said reference plane, and means for visually displaying the distance represented in said counting means.
Claim 3
Dependent Claim
92 words
The device of claim 1 wherein said means for moving said wheel comprises a pulse responsive motor, means for selecting a finish distance between said wheel and said reference plane and storing a numerical representation thereof, means for comparing the numerical representations in said pulse counting means and said selecting means as said motor is operated to downfeed said wheelhead in predetermined increments in response to pulses applied thereto, and means for interrupting operation of said motor when a comparison of said numerical representations indicates the actual position said wheelhead has reached.
Claim 4
Dependent Claim
68 words
The device of claim 2 further including a source of motor drive pulses, a downfeed increment pulse counting device adapted to pass a preselected number of drive pulses to said motor, each drive pulse representing a predetermined increment of movement of said grinding wheel and means for periodically permitting said source to apply a number of drive pulses to said motor preselected by said increment pulse counting means.
Claim 5
Dependent Claim
23 words
The device of claim 1 further including means independent of said resolver for incrementing and decrementing the difference in said pulse counting means.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |