Tabulation control systems for printing apparatus

Claim 2

A tabulation control system for a printing apparatus, comprising in combination: a tab position memory register for continuously memorizing items of encoded decimal value information each representing a series of tab-set positions; means for generating pulse signals; printing head feed means operated by the pulse signals; a pulse counter for successively counting pulse signals supplied to said printing head feed means including means for detecting a starting position of a printing head after the printing head has reached the starting position; a tab command signal generator for reading from said tab position memory register the item of encoded decimal value information representing a next tab-set position distinct from the present tab-set position; means for shifting and controlling the content of said tab position memory register each time said tab command signal generator is operated; and a coincidence detector for detecting the coincidence of the item of encoded decimal value information representing the next tab-set position with the output from said pulse counter.

Claim 3

A tabulation control system for a printing apparatus, comprising in combination a tab position memory register for continuously memorizing a plurality of modes each successively storing items of encoded decimal value information, each mode representing a series of tab-set positions and each mode being linked to another with a stop code therebetween; means for generating pulse signals; printing head feed means operated by the pulse signals; a pulse counter for counting pulse signals supplied to said printing head feed means including means for detecting a starting position of a printing head after the printing head has reached the starting position, each of said pulse signals representing one printing position; a stop code detector for detecting the stop codes memorized in said tab position memory register; a mode designation command signal generator for designating one of the modes memorized in said tab position memory register; a mode designation counter actuated by said mode designation command signal generator; a mode command signal counter for counting the stop code detected by said stop code detector; a first coincidence detector for detecting the coincidence of the output from said mode designation signal counter with the output from said mode command signal counter; a tab command signal generator for reading from the mode designated by said first coincidence detector the item of decimal value information representing a next tab-set position; means for shifting and controlling the content of said tab position memory register each time said tab command signal generator is operated; and a second coincidence detector for detecting the coincidence of the item of decimal value information representing the next tab-set position with the output from said pulse counter thereby to control the operation of said printing head feed means.

Claim 4

A tabulation control system for a printing apparatus, comprising in combination a tab position memory register for continuously memorizing a plurality of modes each successively storing items of encoded decimal value information, each mode representing a series of tab-set positions and each mode being linked to another with a stop code therebetween; means for generating pulse signals; printing head feed means operated by the pulse signals; a pulse counter for counting pulse signals supplied to said printing head feed means including means for detecting a starting position of a printing head after the printing head has reached the starting position, each of said pulse signals representing one printing position; a stop code detector for detecting the stop codes memorized in said tab position memory register; a mode designation command signal generator for designating one of the modes memorized in said tab position memory register; a mode designation counter actuated by said mode designation command signal generator; a mode command signal counter for counting the stop code detected by said stop code detector; a first coincidence detector for detecting the coincidence of the output from said mode designation signal counter with the output from said mode command signal counter; a tab command signal generator for reading from the mode designated by said first coincidence detector the item of decimal value information representing a next tab-set position; means for shifting and controlling the content of said tab position memory register each time said tab command signal generator is operated; and a second coincidence detector for detecting the coincidence of the item of decimal value information representing the next tab-set position with the output from said pulse counter thereby to control the operation of said printing head feed means.