Rivet head caulking machine

Abstract

A caulking machine has a column with a table for placing a work piece having rivet shanks passing therethrough, a cylinder vertically movably mounted on the column, a piston shaft fixedly mounted in the cylinder so as to be movable together with the cylinder, a spindle rotatably mounted in the piston shaft, and a rivet head forming tool having a forming shaft and mounted to the bottom end of the spindle. The forming shaft is adapted to be pressed against the rivet shank in the work piece by operating the cylinder, and can be rotated by a motor via the spindle to form a rivet head on the rivet shank. The machine has a rotation detector for determining whether a rivet head is being formed or the machine is idling by measuring the rotation of the forming shaft. If it is determined that the machine is idling, a display device can be activated and the operation of the machine can be stopped.

Dependencies are inferred from the claim text.