HAND-LEVER CUTTER
Hand-lever cutters stand on the floor and have a convenient height table to lay the work upon. The cut is made by pulling the knife down through the pile. The knife is hung from two swinging links, and is easily operated when it has double shear and a toggle crank connection to the hand-lever shaft.
Fig. 6
POWER CUTTING MACHINE (HAND-CLAMP)
Knife Pulled Down at One End
Power cutting machines substitute power fixtures for the hand (sometimes in addition to the hand operating fixtures), and eliminate labor and save time. A hand-clamp power cutter is operated first by screwing the clamp by hand down firmly upon the line where the work is to be cut; then pulling the starting lever, which causes the knife to make the cut, return to the top, and stop.
Fig. 7
POWER CUTTING MACHINE (HAND-CLAMP)
Knife Pulled at Both Ends
Semi-automatic means a cutting machine which has a treadle to bring the clamp down quickly upon the work, and a regular hand-clamping wheel instantly acting to produce the clamping pressure when it is turned a part of a revolution. The clamp returns automatically to the top by touching the treadle lightly with the foot and giving the clamping wheel a slight backward turn. The advantages are the simplicity of construction and operation of the regular hand-clamp machine, and a gain of about one-third greater output with one-third less effort. Automatic-clamp power cutting machines save labor by pressing the pile by power, instead of requiring the operator to screw the clamp down and back again by hand. In the larger sizes power attachments save the labor of pulling the back gage and work forward by hand. Automatic spacing (or measuring) devices for duplicating any desired width, without the customary measuring for each cut, enable larger production.
Fig.8
AUTOMATIC-CLAMP POWER CUTTING MACHINE
With Instantly Variable Automatic Clamping Device