Patent US3828477A successfully refreshed from Google Patents.
US3828477A
Expired / Lapsed
US
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Closed loop grinder infeed control system w/automatic compensation for wheel diameter changes due to dressing operations
Assignee: SHEFFIELD MACHINE TOOL COMPANY A CORP OF OH
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Filing: 1973-05-07
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Granted: 1974-08-13
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Expires: 1993-05-07
Abstract
Abstract An infeed control system for a grinding machine is disclosed which includes a distance transducer generating trains of electrical pulses in response to wheelhead movement in either direction on the infeed slide, and a first and second up-down counter receiving and counting these electrical pulses generated, the first of these counters counting up in response to pulses generated by grinding infeed movement, the second counting up in response to pulses generated in response to dressing infeed movement. A series of comparator networks compares these counts with preset values set in the series of comparators, and generates sequencing control signals there from at points in the infeed motions of the wheelhead corresponding to the preset values. To compensate for the effect of the changes in wheel diameter due to dressing operations, an arrangement is provided which inhibits the counting up of the counter responding to electrical pulses generated by grinding infeed motion occurring after each dressing operation for a count total equal to the dressing depth.
Inventors
- 👤 N Sanford
- 👤 A Wainscott
- 👤 B Skelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:40
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4166; B; B24; B24B; B24B49/00; B24B49/18; G05B2219/00; G05B2219/30; G05B2219/45; G05B2219/45159; G05B2219/45161; G05B2219/50; G05B2219/50313
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
297 words
An infeed control system in a grinding machine of the type including a grinding wheel, workpiece support means, dresser means, and means for supporting said grinding wheel between said workpiece support means and said dresser means and also including means for advancing said grinding wheel alternatively towards the workpiece support means for machining operations and towards the dresser means for dressing operations, the infeed control system including: distance transducing means for generating a train of signals, said signal trains corresponding to the extent of movement of said grinding wheel towards either said dresser means or said workpiece support means respectively; first up-down counter means counting up in response to said signals in said train generated by said distance transducing means in response to movement of said grinding wheel towards said workpiece support and down in response tO said signals in said train generated in response to movement away therefrom; second up-down counter means counting up in response to said signals in said train generated by said distance transducing means in response to movement of said grinding wheel towards said dresser means and counting down in response to said signals in said train generated in response to movement of said grinding wheel towards said workpiece support means; control means controlling said motion of said grinding wheel in response to the attainment of predetermined counts in said first and second up-down counter means, including means discontinuing the infeed movement of said grinding wheel towards said workpiece support means in response to the attainment of a predetermined count in one of said first or second up-down counter means and discontinuing the infeed movement of said grinding wheel towards said dresser means in response to the attainment of a predetermined count in one of said first or second up-down counter means.
Claim 2
Dependent Claim
297 words
An infeed control system in a grinding machine of the type including a grinding wheel, workpiece support means, dresser means, and means for supporting said grinding wheel between said workpiece support means and said dresser means and also including means for advancing said grinding wheel alternatively towards the workpiece support means for machining operations and towards the dresser means for dressing operations, the infeed control system including: distance transducing means for generating a train of signals, said signal trains corresponding to the extent of movement of said grinding wheel towards either said dresser means or said workpiece support means respectively; first up-down counter means counting up in response to said signals in said train generated by said distance transducing means in response to movement of said grinding wheel towards said workpiece support and down in response tO said signals in said train generated in response to movement away therefrom; second up-down counter means counting up in response to said signals in said train generated by said distance transducing means in response to movement of said grinding wheel towards said dresser means and counting down in response to said signals in said train generated in response to movement of said grinding wheel towards said workpiece support means; control means controlling said motion of said grinding wheel in response to the attainment of predetermined counts in said first and second up-down counter means, including means discontinuing the infeed movement of said grinding wheel towards said workpiece support means in response to the attainment of a predetermined count in one of said first or second up-down counter means and discontinuing the infeed movement of said grinding wheel towards said dresser means in response to the attainment of a predetermined count in one of said first or second up-down counter means.
Claim 3
Dependent Claim
66 words
The system of claim 1 wherein said control means includes means discontinuing said infeed motion of said grinding wheel towards said workpiece support in response to the attainment of a predetermined count in said first up-down counter means and discontinuing said infeed motion of said grinding wheel towards said dresser means in response to the attainment of a predetermined count in said second up-down counter means.
Claim 4
Dependent Claim
68 words
The system of claim 2 wherein said control means includes inhibit means inhibiting said first counter means from counting in response to said signals during initial movement of said grinding wheel away from said dresser means after said dressing operations until said grinding wheel has moved a distance towards said workpiece support means corresponding to a preselected dressing depth removed from the grinding wheel by said dressing operations.
Claim 5
Dependent Claim
29 words
The system of claim 3 wherein said inhibit means includes means responsive to the attainment of a predetermined count in said counter means corresponding to said preselected dressing depth.
Claim 6
Dependent Claim
30 words
The system of claim 2 wherein said control means includes means resetting said second counter means to zero after said dressing operations but before return movement of said grinding wheel.
Claim 7
Dependent Claim
190 words
An infeed control system in a grinding machine of the type including a grinding wheel, workpiece support means, dresser means, and means for supporting said grinding wheel between said workpiece support means and said dresser means and also including means for advancing said grinding wheel alternatively towards the workpiece support means for machining operations and towards the dresser means for dressing operations, the infeed control system including: means responding to movement of said grinding wheel towards said workpiece support means and towards said dresser means to produce signals corresponding to the extent of movement in either direction; control means responsive to said signals to discontinue infeed movement of said grinding wheel towards said workpiece support means or said dresser means in response to the attainment of signals corresponding to predetermined movement in either direction respectively; inhibit means inhibiting the response of said means responding to movement of said grinding wheel during initial movement of said grinding wheel away from said dresser means after dressing operations until said grinding wheel has moved towards said workpiece support means a distance corresponding to preselected dress depth to be removed during said dressing operations.
Claim 8
Dependent Claim
190 words
An infeed control system in a grinding machine of the type including a grinding wheel, workpiece support means, dresser means, and means for supporting said grinding wheel between said workpiece support means and said dresser means and also including means for advancing said grinding wheel alternatively towards the workpiece support means for machining operations and towards the dresser means for dressing operations, the infeed control system including: means responding to movement of said grinding wheel towards said workpiece support means and towards said dresser means to produce signals corresponding to the extent of movement in either direction; control means responsive to said signals to discontinue infeed movement of said grinding wheel towards said workpiece support means or said dresser means in response to the attainment of signals corresponding to predetermined movement in either direction respectively; inhibit means inhibiting the response of said means responding to movement of said grinding wheel during initial movement of said grinding wheel away from said dresser means after dressing operations until said grinding wheel has moved towards said workpiece support means a distance corresponding to preselected dress depth to be removed during said dressing operations.
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |