PIERCER

PURPOSE:To accurately position the form by conforming to a piercing form by providing a form stopper freely rotatably and forming plural walls abutting to the form side so as to vary the distance from this rotation center to each wall of the form stopper. CONSTITUTION:In case of setting a letter sized paper, the letter side paper is placed close to the right side after aligning the mark 21 of a form stopper 13 to the position of a LETTER first. The letter size paper is then moved in the stopper 13 direction and the left side of the letter sized paper 9 is stopped by abutting to the wall 14 of the form stopper 3. The alignment of the form in the horizontal direction and the decision of the piercing position are thus executed. Then, in case of setting an A4 sized paper, the stopper 13 is rotated and the mark 21 of the stopper is aligned to the position of the A4. Thereafter the A4 sized paper is placed close to the right side similarly as the previous time, moved to the stopper 13 direction, stopped by abutting to the wall 15 of the paper stopper 3 and the decision of the piercing position and alignment in the horizontal direction of the form are performed.