US3828439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sizing system for measuring the diameter of a rotating workpiece of non-circular cross-section
Assignee: Toyoda Koki KK
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Filing: 1972-08-21
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Granted: 1974-08-13
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Expires: 1992-08-21
Abstract
Abstract An in-process sizing device generates an output signal corresponding to the diameter of a rotating workpiece of noncircular cross-section. A signal generating circuit generates a first and a second signal each time the output signal is respectively increasing and decreasing in the cycle thereof. A peak holding circuit holds the voltage peak of the output signal in response to the first signal. A sample holding circuit picks up a voltage sample corresponding to a major diameter of the rotating workpiece from the voltage peak in response to the second signal and holds the same therein. Another circuit is connected to the sample holding circuit to generate a sizing signal when the voltage sample attains a voltage preset thereto in accordance with the desired particular diameter.
Inventors
- 👤 M Ishikawa
- 👤 K Moriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:06
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
An in-process sizing system for measuring a particular major diameter of a rotating workpiece of non-circular cross-section, comprising: a detecting device for detecting the changes of diameter of said rotating workpiece to generate an output signal corresponding to the diameter of said rotating workpiece; a signal generating circuit for generating a first signal and a second signal each time said output signal is respectively increasing and decreasing in response to the change of diameter due to the non-circular cross-section of said rotating workpiece; a peak holding circuit for holding the voltage peak of said output signal in response to said first signal; a sample holding circuit for picking up a voltage sample corresponding to said major diameter from said voltage peak in response to said second signal and for holding the same therein; and circuit means connected to said sample holding circuit for generating a sizing signal when said voltage sample attains a preselected voltage in accordance with a desired major diameter.
Claim 2
Dependent Claim
162 words
An in-process sizing system for measuring a particular major diameter of a rotating workpiece of non-circular cross-section, comprising: a detecting device for detecting the changes of diameter of said rotating workpiece to generate an output signal corresponding to the diameter of said rotating workpiece; a signal generating circuit for generating a first signal and a second signal each time said output signal is respectively increasing and decreasing in response to the change of diameter due to the non-circular cross-section of said rotating workpiece; a peak holding circuit for holding the voltage peak of said output signal in response to said first signal; a sample holding circuit for picking up a voltage sample corresponding to said major diameter from said voltage peak in response to said second signal and for holding the same therein; and circuit means connected to said sample holding circuit for generating a sizing signal when said voltage sample attains a preselected voltage in accordance with a desired major diameter.
Claim 3
Dependent Claim
122 words
An in-process sizing system according to claim 1, wherein said detecting device comprises: a pair of measuring feelers held in contacting engagement with said rotating workpiece of non-circular cross-section during a grinding operaTion; a differential transformer connected to said measuring feelers, said differential transformer having a primary coil and a secondary coil therein; a carrier oscillator for supplying a carrier current to said primary coil, said differential transformer modulating said carrier current in response to the relative displacement of said measuring feelers to generate said output signal; an amplifier connected to said secondary coil for amplifying said output signal; and a synchronous rectifier connected to said amplifier for demodulating and rectifying said output signal synchronously with the frequency of said carrier current.
Claim 4
Dependent Claim
120 words
An in-process sizing system according to claim 1, wherein said generating circuit comprises: a condenser connected to said detecting device for cutting out the DC voltage part of said output signal; a first operational amplifier connected to said condenser; a differential circuit connected to said first operational amplifier for generating a positive voltage peak and a negative voltage peak each time said output signal is respectively increasing and decreasing in the cycle thereof; a second operational amplifier connected to said peak holding circuit for supplying said first signal each time said positive voltage peak is generated; and a third operational amplifier connected to said sample holding circuit for supplying said second signal each time said negative voltage peak is generated.
Claim 5
Dependent Claim
81 words
An in-process sizing system according to claim 1, wherein said peak holding circuit comprises: an operational amplifier connected to the output terminal of said detecting device and operable as a buffer amplifier; a first diode connected to said operational amplifier; a condenser connected to said first diode so as to be charged by the voltage peak of said output signal; and a second diode connected to said condenser so as to discharge said condenser when said first signal is applied thereto.
Claim 6
Dependent Claim
85 words
An in-process sizing system according to claim 1, wherein said sample holding circuit comprises: switching means connected to said peak holding circuit and to said signal generating circuit for picking up said voltage sample from said voltage peak in the cycle of said output signal when said second signal is applied thereto; a condenser connected to said switching means for holding said voltage sample; and an operational amplifier connected to said condenser and said switching means so as to be operable as a buffer amplifier.
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) | 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 |