JPS6487192A - Pucnhing machine - Google Patents

Abstract

PURPOSE: To shorten the stroke of a punch pin and reduce the capacity of a motor for driving the punch pin by making the gouging depth by a blade on the end of the punch pin deeper than the thickness of a plurality paper sheets to be punched. CONSTITUTION: Two slants 57a, 57b slanting toward the center of a punch pin 56a of a punching machine is provided on the end of the punch pin 56a and the gouging depth 1 by a blade is made deeper than the thickness (m) of a plurality of recording papers P to be punched. Accompanying the punching of the punch pin 56a, the load on the punch pin 56a reduces for an instant when its atmost lower end points A, B reach the position where they pass the whole thickness of the recording papers P. Immediately thereafter, the load on the punch pin 56a increases again when the atmost upper end points C, C' of the blade reach the uppermost position P. As the punch pin 56a descends, its fitting amount into the recording papers P gradually increases and finally a punch hole is pierced through. Thus capacity of the motor for driving the punch pin 56a can be made smaller by dividing the load charged to the punch pin 56a into two relatively low peaks.