PLATE THICKNESS DETECTING METHOD BY ROTARY ENCODER OF TWO-SHEET TAKE DETECTING DEVICE FOR PLATE

摘要

PURPOSE:To decide many kinds of plate thickness and to detect a two-sheet take by providing the rotary encoder which outputs the thickness of a plate material in the form of a pulse quantity. CONSTITUTION:A fixed plate 3 is provided with a swivel plate 5 and when the thickness of the plate material W is detected, the swivel plate 5 is rotated by 90 deg. by an actuator 7 to a pass line for the plate material. The clamp 15 consisting of an upper arm 11 and a lower arm 13 (fitted with contactors 21 and 23 atop) and the detecting device 9 consisting of the rotary encoder 19, etc., are mounted on the plate 5. When the plate thickness is measured, the number of pulses from the B position to the C position of the clamp 15 is counted and stored as an initial value in a RAM 33. Then the plate material W is inserted into the clamp 15 and the number of main pulses from the B position to the contacting of the contactors 21 and 23 with the plate material W is counted. A CPU 29 multiplies the difference between the initial value and the number of main pulses by a specific value to a calculate the plate thickness and displays the result on a device 37. Thus, many kinds of plate thickness are decided and the two-sheet take is detected.