Patent ID: 8127677

Claim:
A plate inserting apparatus comprising: a plate cylinder with an outer surface where a plate is to be mounted; a press roller which is rotatably supported to oppose the outer surface of said plate cylinder and, when a leading edge bent portion of the plate to be supplied to said plate cylinder abuts against said press roller and a distal end of the leading edge bent portion abuts against the outer surface of said plate cylinder, inserts the leading edge bent portion of the plate into a groove portion formed in said plate cylinder upon the rotation of said press roller according to said plate cylinder; and a braking unit which starts a braking operation to the plate when the leading edge bent portion of the plate abuts against said plate cylinder and said press roller and terminates the braking operation to the plate when the leading edge bent portion of the plate is inserted in the groove portion of said plate cylinder, a potentiometer which generates rotational phase pulses as the plate cylinder rotates, and a control unit which detects the rotational phase of said plate cylinder on the basis of the rotational phase pulses generated by said potentiometer to thereby control said braking unit.