US3601930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine
Assignee: Heald Machine Co
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Filing: 1969-11-17
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Granted: 1971-08-31
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Expires: 1989-11-17
Abstract
Abstract This invention relates to a grinding machine and, more particularly, to apparatus for generating a surface of revolution by the abrasive process using the controlled-force principle wherein the force is regulated by control of feed using electrical means.
Inventors
- 👤 Edward G Robillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:51
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/007; B23Q15/12; B24; B24B; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
A grinding machine for generating a surface of revolution on a workpiece, comprising a. a base, b. a workhead mounted on the base for supporting the workpiece for rotation about the axis of the surface of revolution, c. a wheelhead mounted on the base and rotatably supporting a spindle on which an abrasive wheel is mounted, d. feed means for bringing about relative movement between the wheelhead and the workhead to cause the wheel to engage the workpiece for a grinding operation, e. recording means for indicating at all times the size of the wheel and generating a signal indicative thereof, f. a transducer generating a signal indicative of the force between the wheel and the workpiece, and g. a control receiving a signal from the recording means and from the transducer and transmitting a command signal to the feed means to adjust the said movement to maintain the said force at a predetermined value commensurate with the size of the wheel.
Claim 2
Dependent Claim
162 words
A grinding machine for generating a surface of revolution on a workpiece, comprising a. a base, b. a workhead mounted on the base for supporting the workpiece for rotation about the axis of the surface of revolution, c. a wheelhead mounted on the base and rotatably supporting a spindle on which an abrasive wheel is mounted, d. feed means for bringing about relative movement between the wheelhead and the workhead to cause the wheel to engage the workpiece for a grinding operation, e. recording means for indicating at all times the size of the wheel and generating a signal indicative thereof, f. a transducer generating a signal indicative of the force between the wheel and the workpiece, and g. a control receiving a signal from the recording means and from the transducer and transmitting a command signal to the feed means to adjust the said movement to maintain the said force at a predetermined value commensurate with the size of the wheel.
Claim 3
Dependent Claim
55 words
A grinding machine as recited in claim 1, wherein the recording means includes a stepping motor which receives successive signals indicative of the amount of wheel dress and stores the accumulated sum of the signals and includes a potentiometer driven by the stepping motor whose voltage output is always proportional to the said accumulated sum.
Claim 4
Dependent Claim
33 words
A grinding machine as recited in claim 2, wherein the transducer consists of a strain gage inserted between the wheelhead and the base to generate an electrical signal indicative of the grinding force.
Claim 5
Dependent Claim
61 words
A grinding machine as recited in claim 3, wherein the feed means consists of a stepping motor, wherein the control consists of a pulse generator transmitting pulses to the feed stepping motor, and wherein the signal from the potentiometer is connected to the pulse generator to modulate the frequency of pulse generation in accordance with the size of the abrasive wheel.
Claim 6
Dependent Claim
60 words
A grinding machine as recited in claim 4, wherein a compensation apparatus including a stepping motor and compensation slide is interposed between the feed stepping motor and the base, wherein the compensation stepping motor receives a group of pulses on occasion from the pulse generator, the same group of pulses being transmitted to the stepping motor of the recording means.
References Cited (Backward Citations)
US3269064A
Cited
US3417512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |