JPS5627629A - Form detecting device - Google Patents

Abstract

PURPOSE: To improve form detecting accuracy by controlling as required the period of integrating a displacement detecting signal corresponding to the tension distribution of a rolled work material corresponding to an external force applied in required timing to avoid the effect of a transient phenomenon.

CONSTITUTION: If an electromagnetic force by flowing a current to a coil via a driving signal generator, a sample timing generating circuit 8, etc., is applied to a work under rolling, the work is displaced corresponding to a tension distribution occurred corresponding to the form of the work. The detection signal of this displacement according to, for example, a capacity change is integrated and then sample-held by an integrating circuit 6 via the changeover circuit 5 of a signal processing circuit 9 controlled via the circuit 8. On the other hand, the integration period of the circuit 6 is controlled as required by an integration timing generating circuit 38 controlled via the circuit 8 and becomes longer than a transient period in the rise and fall of the displacement detection signal applied to the circuit 6 during the suspended period of integration. By so doing, form detection with high accuracy free of disturbance can be carried out.

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