Print wheel selection type compact printer.

摘要

In a print wheel selection type compact printer print wheels (3) are mounted on a print wheel shaft (1) to be rotated into specific angular positions for type selection. A print wheel spring (2) is arranged between each print wheel (3) and the print wheel shaft (1) and forms part of a clutch mechanism to either couple the respective print wheel (3) to or release it from the print wheel shaft (1). One or more indentations (1a, 1e) are provided in the print wheel shaft (1) for each print wheel (3) and adapted to be engaged by or disengaged from a protrusion (2a) of the print wheel spring (2). The leading surface in the direction of rotation of said print wheel shaft (1) of the profile of one or both of the indentation (1a) of the print wheel shaft (1) and the protrusion (2a) of the print wheel spring (2) comprises at least two surfaces of different slants.