Movement No. 36 presents one of the most mechanically fascinating and historically distinctive gear mechanisms in the entire 507 collection — the Mangle Wheel and Pinion, named for its original application in cloth-pressing mangle machines. This mechanism performs a remarkable transformation: it converts the continuous unidirectional rotation of a small pinion into a reciprocating (back-and-forth) rotary motion of the large mangle wheel — without any reversal of the driving pinion’s rotation. The mangle wheel is a large disk-like gear with teeth arranged around its periphery on both the inside and outside of its rim, forming a continuous closed track of teeth. A slot is cut into the face of the mangle wheel following its outline, which serves to guide and constrain the pinion shaft. A small pinion meshes with these teeth and is carried on a shaft that slides vertically in a straight slot cut in a fixed stationary upright bar. As the pinion rotates continuously in one direction, it travels along the outer teeth of the mangle wheel — driving the wheel in one direction — until it reaches the end of the outer tooth track, at which point the guiding slot in the wheel face transitions the pinion shaft smoothly from the outside to the inside of the wheel’s tooth track. The pinion then travels back along the inner teeth, driving the mangle wheel in the opposite direction — all while the pinion itself continues rotating in the same direction without interruption. The pinion shaft rises and falls in the stationary bar’s slot to accommodate this transition between the inner and outer gear tracks. The result is a smooth, continuous reciprocating oscillation of the large wheel produced entirely by unidirectional pinion rotation — an elegant kinematic solution that was used in early laundry mangles, and whose principle appears in various intermittent and reciprocating drive applications throughout mechanical history.
36. Mangle-wheel and pinion-so called from their application to mangles-converts continuous rotary motion of pinion into reciprocating rotary motion of wheel. The shaft of pinion has a vibratory motion, and works in a straight slot cut in the upright stationary bar to allow the pinion to rise and fall and work inside and outside of the gearing of the wheel. The slot cut in the face of the mangle-wheel and following its outline is to receive and guide the pinion-shaft and keep the pinion in gear.