When vertical disks 1 and 2, keyed to shaft A, rotate, motion is transmitted by one of them to flywheel 3 which is rigidly attached to the top of vertical screw 4. When disk 1 is shifted in to contact with flywheel 3, screw 4, connected by a screw pair to fixed threaded member 5, propels ram 6 downward with increasing velocity throughout its stroke until ram die 7 strikes the work lying on anvil die 11. The ram is returned to its top position by shifting disk 2 in to contact and disk 1 out of contact with flywheel 3. This is accomplished by lever 8 and links 9 and 10. At this, screw 4 is reversed and ram 6 and die 7 are raised at decreasing velocity toward the end of the up stroke. Belt-shifter 12 and links 13, 14 and 15 serve to shift the driving belt from the idle pulley to the working pulley and back again.
$3458$CF,HP$