Wheel 1 rotates about fixed axis A and carries twelve roller-type pins 6. Spring-loaded rivet snap 2 reciprocates in fixed guide B. Lever 4 turns about fixed axis C and its end b acts on rivet dolly 3. By turning lever 4 counterclockwise, the sheets 5 to be riveted, together with snap 2 and dolly 3, are raised until pins 6 of wheel 1 strike rivet snap 2 with a series of blows.
$3168$SmC,FD$