Device for fitting rivets, buttons or the like

A device for fitting articles including rivets, buttons and the like, which comprise an article lower-portion and an article upper-portion, to a fabric and the like, the device comprising:

• a lower tool serving as an abutment for the article lower-portion;
• a ram executing a riveting stroke, a lower end of the ram forming an upper tool for impinging upon the article upper-portion and for urging the article against the lower tool upon execution of the riveting stroke;
• a rotatable driven cam disc, an upper end of the ram cooperating with the rotatably driven cam disc for controlling travel movement of the ram;
• a clamp displaceable by the ram in a direction of and in synchronism with movement of the ram, wherein, in order to provide a finger protecting function, the device is operative to stop the clamp in a position spaced from the lower tool during a first lowering movement;
• an electrical switch, and means mechanically coupled to the ram for actuating the switch during the first lowering movement, actuation of the switch stopping the device prior to advancement of the ram to a spaced position from the lower tool, the spaced position being less than the thickness of the finger, and wherein a subsequent second lowering movement of the clamp is initiated by further rotation of the cam after the spaced position is reached;
• and wherein
• the cam disc stops advancement of the ram for a period between a first and a second lowering movement, and thereafter advances the ram to take the clamp along therewith in movement synchronous with movement of the ram over its entire downward path;
• and
• a spring connected between the clamp and the ram for coupling the clamp in a single-sided free movement in relation to the ram against a force of the spring, the spring being loaded either on application of the clamp to the fabric or upon a contact with the finger for actuation of the switch to trigger the finger protecting function, loading of the spring occurring along with a relative movement between the ram and the clamp and resulting in actuation of the switch.