Printing apparatus having a memory for storing composite and printed character information for subsequent erasure

A printing apparatus comprising:

• a first character key for inputting a first character;
• a second character key for inputting a second character;
• printing means for printing the first and second characters on a printing paper in response to actuation of said first character key and said second character key;
• a correction key;
• erasing means for erasing the printed character on the printing paper in response to actuation of said correction key;
• instruction means for instructing a movement of said printing means;
• first memory means, after printing the first character input by said first character key, for making said printing means opposed to a print position of the first character in response to the instruction of said instruction means, and then storing a composite character without adding any qualifier information between first and second character information, the composite character being obtained by printing the second character input through said second character key and including the first and second characters;
• said memory means responsive to operation of said correction key for sequentially storing, character by character, the first and second character information from said first memory means;
• and
• control means for sequentially transmitting the first and second character information from said first memory means to said second memory means to conduct individual erasing operations on said first and second characters by said erasing means.

A printing apparatus comprising:

• a first character key representing a first character;
• a second character key representing a second character;
• an erasure instruction key for instructing an erasure operation;
• erasure means for erasing the character printed on a recording sheet;
• recording sheet feed means capable of reciprocally feeding the recording sheet;
• first memory means for storing recording sheet feed information, first character information and second character information when the first character and the second character are printed at the horizontally same position, the recording sheet feed information representing a quantity of the recording sheet to be fed between the printing of the first character and the printing of the second character, the first character information representing the first character, and the second character information representing the second character;
• second memory means for sequentially fetching and storing the first and second character information stored in said first memory means;
• and
• control means for controlling said erasure means and said recording sheet feed means such that, in the case of performing the erasure operation responsive to the instruction of said erasure instruction key, the first and second character information are fetched from said first memory means to said second memory means, and after erasing the first character the feeding of the recording sheet in a direction opposite to the direction in a printing operation is performed in response to the recording sheet feed information, after which the second character is erased.

A character processing apparatus comprising:

• first memory means capable of storing a plurality of character information respectively representing printed characters;
• first input means for inputting the character information representing the character to be printed;
• second input means for inputting print information required for the print operation;
• second memory means for storing the print information input by said second input means;
• print means for printing the character information input by said first input means, in response to the print information input by said second input means;
• comparison means for comparing the print information previously input by said second input means with newly input print information;
• and
• memory control means for storing the newly input print information into said second memory means when in said comparison means it is discriminated that the newly input print information is different from the previously input print information.