Abstract: Control parameters necessary for controlling mechanism sections of a printing apparatus are stored in a program ROM. Selection data used for selecting predetermined control parameters stored in the program ROM are stored in a non-volatile memory. When operations of the mechanism sections of the printing apparatus are selectively changed, the selection data stored in the non-volatile memory are changed in accordance with operating states of the mechanism sections. The mechanism sections of the printing apparatus can be controlled upon every change in their operations without replacement of the ROM for storing the control parameters.

Abstract: A printing apparatus is disclosed which comprises a platen roller for feeding a cut paper sheet set on a hopper, a paper bail bar having paper bail rollers used in conjunction with the platen roller to secure the cut paper sheet against the platen roller, and a paper loading mechanism for loading the cut paper sheet by causing rotation of the platen roller at a predetermined angle. The paper loading mechanism includes a paper bail switch for checking whether the paper bail roller is in contact with the platen roller. When it is detected by the paper bail switch that the paper bail roller is released from the platen roller, the platen roller is rotated in the normal direction at a first predetermined angle. When, it is detected by the paper bail switch that the paper bail rollers are in contact with the platen roller, the platen roller is rotated in the reverse direction at a second predetermined angle.