Crank wheel and con-rod transmission with amplitude adjustment - attaches input end of con-rod to mid-point of inclined telescopic crank pin

摘要

The crank wheel (5) with connecting rod (7) converts input rotation into reciprocal linear motion, incorporates amplitude adjustment, and may be used to drive the thermal comb of a printer. The trailing end of the rod connects (14) to an inclined extended crank-pin (11), and the inclination of the pin (11) is varied to adjust the amplitude of slide (9) movement. The pin may comprise a telescopic lever which extends from the crank wheel hinge (41) to a ball-joint fulcrum (11a). The latter centres on an extension of the wheel (5) axis (3). The ball is located by a screw (12) rotated to adjust the pin length and its inclination, the trailing end of the rod having a nominally fixed axial (3) relationship with the wheel.