US3842545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control method and apparatus for a machine in particular for a grinding machine
Assignee: Finike Italiana Marposs SpA
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Filing: 1972-12-06
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Granted: 1974-10-22
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Expires: 1992-12-06
Abstract
Abstract A method and apparatus for improving the speed of operation of a machine tool wherein a given dimension of a workpiece being machined is continuously measured, the signal representing the measured dimension being supplied to the machine tool control apparatus; this measured value is also compared with a preset reference value representing the given dimension at a time prior to completion of machining; the current machining speed is also calculated from the measured dimension. When the measured value of the dimension equals the reference value, the measuring means is moved out of engagement with the workpiece and the amount of machining is thereafter calculated on the basis of the last machining speed calculated just prior to the disengagement of the measuring means; the calculated machine amount is then compared with the reference value and the difference therebetween is supplied to the machine tool control apparatus.
Inventors
- 👤 M Possati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:42
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/007; B23Q15/013; B23Q15/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A method for use with a machine tool apparatus having means for machining a workpiece and means for measuring the dimensions of the workpiece being machined comprising: generating a measurement signal depending on the dimensions of the workpiece being machined; controlling withdrawal of the measuring means at a point of the machining cycle before said measurement signal reaches the value corresponding to the required final dimensions of the workpiece; processing the values of the measurement signal generated at the time of withdrawing the measuring means, for generating a control signal varying thereafter with a law analogous to that of said values of the measurement signal generated at the time of withdrawing; utilizing said control signal for automatically controlling the completion of the machining of the workpiece.
Claim 2
Independent Claim
126 words
A method for use with a machine tool apparatus having means for machining a workpiece and means for measuring the dimensions of the workpiece being machined comprising: generating a measurement signal depending on the dimensions of the workpiece being machined; controlling withdrawal of the measuring means at a point of the machining cycle before said measurement signal reaches the value corresponding to the required final dimensions of the workpiece; processing the values of the measurement signal generated at the time of withdrawing the measuring means, for generating a control signal varying thereafter with a law analogous to that of said values of the measurement signal generated at the time of withdrawing; utilizing said control signal for automatically controlling the completion of the machining of the workpiece.
Claim 3
Independent Claim
147 words
A method for use with a machine tool apparatus having means for machining a workpiece and means for measuring the dimensions of the workpiece being machined, comprising: generating a measurement signal responsive to the dimensions assumed by the workpiece during the machining; processing said measurement signal for obtaining a signal responsive to the rate of stock removal from the workpiece; comparing said measurement signal with a preset value corresponding to a dimension of the workpiece different from the required final dimension to be attained by the machining; automatically controlling the detecting of the value of the signal responsive to the rate of stOck removal when said measurement signal reaches a value corresponding to said preset value; generating a control signal varying with a rate equal to that detected at the preceding step; utilizing said control signal for automatically controlling the completion of the machining of the workpiece.
Claim 4
Independent Claim
147 words
A method for use with a machine tool apparatus having means for machining a workpiece and means for measuring the dimensions of the workpiece being machined, comprising: generating a measurement signal responsive to the dimensions assumed by the workpiece during the machining; processing said measurement signal for obtaining a signal responsive to the rate of stock removal from the workpiece; comparing said measurement signal with a preset value corresponding to a dimension of the workpiece different from the required final dimension to be attained by the machining; automatically controlling the detecting of the value of the signal responsive to the rate of stOck removal when said measurement signal reaches a value corresponding to said preset value; generating a control signal varying with a rate equal to that detected at the preceding step; utilizing said control signal for automatically controlling the completion of the machining of the workpiece.
Claim 5
Dependent Claim
29 words
The method according to claim 2, further comprising the step of automatically controlling the withdrawal of said measuring means prior to the completion of the machining of the workpiece.
Claim 6
Dependent Claim
29 words
The method according to claim 3, wherein the withdrawal of the measuring means is controlled when the measurement signal reaches a value at least equal to said preset value.
Claim 7
Dependent Claim
37 words
The method according to claim 2, further comprising the step of automatically interrupting the machining of the workpiece as soon as the generated control signal reaches a value corresponding to the required final dimension of the workpiece.
Claim 8
Dependent Claim
100 words
The method according to claim 2, wherein the measurement signal, the preset value, the signal responsive to the rate of stock removal and the control signal are electrical quantities and wherein generating and utilizing said control signal comprise the further steps of: electrically storing said detected value of the signal responsive to the rate of stock removal; electrically integrating this detected value with respect to the time; electrically subtracting the signal produced by the last step from the preset value; utilizing the electrical signal resulting from the last step for automatically controlling the completion of the machining of the workpiece.
Claim 9
Dependent Claim
161 words
Apparatus for use with a machine tool comprising: measuring means for measuring a workpiece by providing a measurement signal depending on the workpiece dimension; machine controlling means connected with said measuring means for controlling the machining cycle by said measurement signal; switch means adapted to disconnect said machine controlling means from said measuring means; comparison means coupled to the output of said measuring means for comparing said measurement signal with a preset value and for operating said switch means when the measurement signal reaches the preset value; processing means connected with said measuring means and comparison means and adapted to generate, after the operation of said switch means, by the comparison means a control signal varying with a law analogous to that of the measurement signal at the time of said operation of the switch means, the output of the processing means being coupled to said machine controlling means for controlling the machining cycle after the operation of the switch means.
Claim 10
Dependent Claim
161 words
Apparatus for use with a machine tool comprising: measuring means for measuring a workpiece by providing a measurement signal depending on the workpiece dimension; machine controlling means connected with said measuring means for controlling the machining cycle by said measurement signal; switch means adapted to disconnect said machine controlling means from said measuring means; comparison means coupled to the output of said measuring means for comparing said measurement signal with a preset value and for operating said switch means when the measurement signal reaches the preset value; processing means connected with said measuring means and comparison means and adapted to generate, after the operation of said switch means, by the comparison means a control signal varying with a law analogous to that of the measurement signal at the time of said operation of the switch means, the output of the processing means being coupled to said machine controlling means for controlling the machining cycle after the operation of the switch means.
Claim 11
Dependent Claim
142 words
The apparatus according to claim 7, wherein said processing means comprises: a derivative circuit connected with said measuring means for providing an output signal responsive to the derivative of the measurement signal; further switch means connected to said comparison means and adapted to be operated when the measurement signal reaches said preset value; store means connected with said derivative circuit through said further switch means for receiving and storing the output of the derivative circuit at the time of the operation of said further switch means; integrating means connected with said store means for integrating the output thereof after said operation of the further switch means; and difference means adapted to receive said preset value and the output of the integrating means for providing said output control signal for controlling the machine tool after said measurement signal has reached said preset value.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |