Movement No. 80 converts the oscillating motion of a lever into rectilinear motion of a slotted rack-bar. As lever (C) vibrates back and forth, two hooked pawls drop alternately into the teeth of the slotted bar (A), advancing it one step at a time in a linear direction. The alternating action of the two pawls ensures that the bar receives a push on both strokes of the lever, producing a nearly continuous linear feed. This mechanism is well suited for applications requiring controlled step-by-step linear advancement, such as in feeding mechanisms, printing presses, and textile machinery.
80. Rectilinear motion is imparted to the slotted bar, A, by the vibration of the lever, C, through the agency of the two hooked pawls, which drop alternately into the teeth of the slotted rack-bar, A.