Impact printer with means for adjusting the associated print hammer

A printing apparatus comprising:

• a base plate;
• a printing station including a document track which is perpendicular to and secured to said base plate;
• presenter means located at said printing station for presenting characters to be printed in a first plane substantially parallel to said document track and located therein;
• a support plate having a top surface and a bottom surface;
• a print hammer;
• means for pivotally mounting said print hammer on said support plate and also for moving said print hammer in a second plane parallel to said top surface of said support plate between non-printing and printing positions relative to said printing station;
• said print hammer having an impact plane to cooperate with a selected one of a plurality of characters on said presenter means to print said character on a document positioned between said presenter means and said impact plane when said hammer is moved to said printing position;
• said impact plane having mutually perpendicular first and second imaginary axes lying in said impact plane of said print hammer;
• first and second adjustable eccentric means coupled between said support plate and said base plate to enable said first imaginary axis of said impact plane to be positioned parallel to said first plane when said print hammer is in said printing position;
• said support plate having a recess in said bottom surface;
• a moveable adjusting member slidably mounted in said recess next to said base plate to enable said second imaginary axis of said impact plane to be positioned parallel to said first plane and perpendicular to said support plate when said print hammer is in said printing position;
• and
• securing means for securing said first and second adjustable eccentric means and said moveable adjusting member in fixed positions when said print hammer is in said printing position and said impact plane is parallel to said first plane.