VARIABLE RADIUS CRANK ARM FOR TYPEWRITER IMPRESSION CONTROL

摘要

A variable radius crank arm which is selectively adjustable is disclosed in a typewriter setting and used to exert an influence on the flight of the typebar towards the print impression position for the purpose of controlling the velocity of the typebar at impact and hence the quality of the printed impression. The crank arms is provided with a selectively positionable clip which is retained in the selected position by appropriate detenting. The compactness of the design combined with the ease of accessibility for the purpose of adjusting the clip to the selected position is a feature of the invention. Another feature resides in the fact that the clip on the variable radius crank arm may be selectively positioned to any desired position without introducing undesired or detrimental effects in the positioning or placement of any other parts. This last feature is achieved by positioning the clip in an arcuate slot.