Numbering machine with check digit function

A numbering machine in which each of code numbers to be printed and a check digit number associated therewith are printed simultaneously, said machine comprising:

• a print unit including a plurality of numbering type wheels for successively setting the code numbers in response to print operations;
• a check digit type wheel including a predetermined circulating sequence of digits for check digits corresponding to the code numbers to be printed by said print unit;
• and
• a check digit type wheel drive control means whereby in response to a change of the code number of said print unit by a print operation, the check digit printing digit on said check digit type wheel is changed according to a predetermined number of skips, said check digit type wheel drive control means including:
• synchronous drive means for rotating said check digit type wheel in synchronism with the intermittent rotation of the numbering type wheel corresponding to the least significant digit place;
• synchronous drive releasing means for disengaging said synchronous drive means with said check digit type wheel in response to a change of the code number on the numbering type wheels of said print unit dictating a skipping of said circulating sequence of digits for check digits;
• a driving source for imparting a rotational driving force to said check digit type wheel in response to the disengagement of said synchronous drive releasing means;
• and
• rotational angle control means whereby said check digit type wheel is rotated by said driving source through a predetermined rotational angle corresponding to a predetermined number of skips of the circulating check digit pattern corresponding to a change of the code number.