Patent US3863400A successfully refreshed from Google Patents.
US3863400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the approach speed in machine tools particularly grinding machines
Assignee: Finike Italiana Marposs SpA
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Filing: 1973-05-31
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Granted: 1975-02-04
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Expires: 1993-05-31
Abstract
Abstract A device for controlling the approach speed of a grinder toward a piece to be machined which includes a unit containing a control group and a processing group for the continuous evaluation of size changes in time of pieces during a machining cycle and a commutation group operated by said unit to control the passage from approach speed to feed speed. The device may include a threshold circuit between the unit and the commutation group to avoid commutation as a result of mechanical or electrical oscillations. The device also may include a timing means associated with the unit to control its triggering which may be placed at the output of a second threshold circuit which receives signals from a gauging head adapted to measure the sizes of the pieces being machined.
Inventors
- 👤 Roberto Rossi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:54
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/02; B24B49/04; B23; B23Q; B23Q15/00; B23Q15/20; B23Q15/22; B23Q15/225
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A device for controlling the approach speed of the tool towards the pieces to be machined in machine-tools, particularly grinders, comprising gauging means, adapted to provide a signal responsive to the actual size of the workpiece; a processing unit connected with said gauging means and adapted a process said signal responsive to size, for providing a signal responsive to the rate of size change; and a commutating group, operated by said unit, to control, at the time of contact between tool and piece, the passage from approach speed to feed speed.
Claim 2
Independent Claim
91 words
A device for controlling the approach speed of the tool towards the pieces to be machined in machine-tools, particularly grinders, comprising gauging means, adapted to provide a signal responsive to the actual size of the workpiece; a processing unit connected with said gauging means and adapted a process said signal responsive to size, for providing a signal responsive to the rate of size change; and a commutating group, operated by said unit, to control, at the time of contact between tool and piece, the passage from approach speed to feed speed.
Claim 3
Dependent Claim
18 words
The device according to claim 1, including a threshold circuit placed between said unit and said commutating group.
Claim 4
Dependent Claim
19 words
The device according to claim 2, further including a timing means associated with said unit to control its triggering.
Claim 5
Dependent Claim
55 words
The device acccording to claim 3, in which said timing means is placed at the output of a second threshold circuit, said second threshold circuit being fed at the input by said gauging means, the signals of the gauging means causing the triggering of said second threshold circuit, said gauging means comprising a gauging head.
Claim 6
Dependent Claim
41 words
The device according to claim 4, in which said second threshold circuit is provided with a terminal to which a reference voltage is applied, to control triggering of the circuit itself, on the basis of the signals of said gauging head.
Claim 7
Dependent Claim
46 words
The device according to claim 4, in which said timing means is inserted between said second threshold circuit and said unit to put into operation a control group of the unit itself with a pre-set delay with respect to said triggering of the second threshold circuit.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |