Printing apparatus

Abstract

Abstract A printing apparatus for cash registers and the like wherein the set of type wheels are rotated through cooperating serrations by respective connection discs which are loosely mounted on an operating shaft that is reciprocally rotated by a suitable driving system. An arm member is secured to the operating shaft adjacent each disc for reciprocal rotation therewith and has a lock member formed on its free end which cooperates with a catch means formed on a lever member which is pivotally supported on the adjacent connection disc. A spring is connected between each lever member and the connection disc for urging the catch means into cooperative engagement with the lock member so as to rotate the connection discs with the operating shaft through the adjacent arm members. A selectively operated pawl is arranged adjacent each connection disc to stop the rotation of the connection disc at a predetermined position corresponding to the proper positioning of a digit on the cooperating type wheel, at which time the spring permits release of the cooperating engagement between the catch means and the lock member permitting the continued rotation of the operating shaft. Thus, the shaft may rotate until each of the connection discs has been stopped at a proper position and then the appropriate digits on the type wheels may be printed. Rotation of the shaft is then reversed and the connection wheels returned to their original positions by release of the pawls and re-engagement of the catch means and lock members. Alternate forms of the driving system for rotation of the operating shaft are disclosed and a second set of type wheels may be included for cooperation with the connection discs to provide a second corresponding printout.

Inventors

• 👤 Chuji Ishikawa

Bibliographic Details