PURPOSE: To raise the reliability on suction and manage the suction stroke accurately, in a suction head.

CONSTITUTION: A suction head is composed of a pipe 3, which is connected to a vacuum pump 1 and is provided, at the top, with a ventilation hole 2, a sliding sleeve 4, which is set freely of sliding to the top of the pipe 3, a spring 5, which energizes the sliding sleeve 4 toward the top of the pipe 3, and a suction head 6, which is fixed to the top of the sliding sleeve 4 and is made in fan shape out of soft material.