Impact control for carrier mounted serial printers

摘要

A printing device in a typewriter including a rocker bracket turned in a direction of printing by a cam rotated when a key is pressed, a type head vertically movable and rotatably supported by the rocker bracket, a vertically movable pulley and rotatable pulley which are mounted on the bracket which are connected to a letter selecting mechanism and rotated by a predetermined value in accordance with a letter selected by the key, a printing arm for pivotally supporting a trigger detachably engageable with the rocker bracket and abutting against and being rotated by the cam to turn the rocker bracket, vertical direction selecting means for moving to a predetermined position in accordance with a value of rotation of the vertically movable pulley, rotational direction selecting means provided on the rotatable pulley and a printing pressure control member for being movable in accordance with the movements of the vertical directional selecting means and the rotational direction selecting means and having at least two abutting portions within a moving path of the trigger, whereby the position of the printing pressure control member is set by the respective selecting means and the trigger is caused to impinge on a portion selected out of the abutting portions, so that a position where the rocker bracket is to be released can be adjusted to thereby enable adjustment of the printing pressure.