PURPOSE: To remove steady offset by providing a thickness meter with a displacement measuring means for measuring an axial interval obtained when two gauge rollers rotating while abutting upon a plate-like member are abutted on each other and using the measured value as a reference interval.
CONSTITUTION: The axial interval of the two gauge rollers 10, 11 rotating while abutting upon the plate-like member is converted into a corresponding AC signal by a differential transformer 12 and the AC signal is supplied to an AC signal/ DC signal convertion circuit (AC/DC conversion circuit) 13. The AC/DC conversion circuit 13 constituted of a synchronous detector or the like detects the output from the differential amplifier 12, converts the output into a DC signal and supplies the DC signal to a corrected value calculating circuit 14 and a differential amplifier 15. Said constitution makes it possible to remove steady offset generated when characteristic change or the like is generated on the side of a circuit measuring the displacement of the gauge rollers or the like.
HIMIZU KAZUO
FUJITA KEIJI
HATSUTORI MASAJI
NIPPON METAL IND
| JPS533261A | 1978-01-12 | |||
| JPS5659609U | 1981-05-21 | |||
| JPS522452A | 1977-01-10 |