JPS5586639A - Control method of riveter - Google Patents

Abstract

PURPOSE: To prevent the damaging of a rivet-pushing body and achieve speeding-up by so automatically controlling the riveter that the pushing body is lowered by vertically slidable pistons under low pressure until its bottom end reaches the rivet and is then lowered under high pressure after it has reached the same.

CONSTITUTION: Mechanisms of oscillating a rivet-pushing body are provided to the upper and lower pistons 4, 5 which are vertically and integrally slidably fitted in the upper and lower cylindrical parts 1a, 1b of a cylinder 1 and are so constituted that as low pressure air is fed into the upper and lower cylindrical part 1a or 1b through a reducing valve 51 and changeover valve 52 from a compressed air source 50 the pistons 4, 5 move upward or downward. The pushing body is lowered under low pressure. When its bottom end reaches the rivet, the decrease in the exhaust pressure of the cylindrical part 1a is detected with a pressure switch 53 and the signal thereof causes high pressure air to be fed into the cylindrical part 1b through a changeover valve 54, thereby giving the descending force of high pressure to the pushing body. In this way, the strong collision of the bottom end of the pushing body against the rivet is prevented and speeding-up achieved.

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