Front/back discrimination device for time card, time recorder provided with same, front/back discrimination method for the time card, and program

A time card front/back discrimination method of determining front and back faces of a time card having a first cut-out formed at one corner of an edge of the time card and a second cut-out formed at the other corner of the edge, where a side length of the time card at which the first cut-out is formed is different from a side length of the time card at which the second cut-out is formed, the method comprising:

• a step for detecting a side edge of a fed time card;
• a step for detecting a bottom of the fed time card;
• a step for counting a number of pulses of a predetermined pulse signal after the side edge of the time card is detected and until the bottom of the time card is detected;
• and
• a step for detecting a side length of the time card at which a cut-out is formed based on the number of counted pulses, and determining whether the cut-out is the first cut-out or the second cut-out based on the detection to determine the front and back faces of the time card.

A program that causes a computer to execute:

• a process for detecting a side edge of a fed time card;
• a process for detecting a bottom of the fed time card;
• a process for counting a number of pulses of a predetermined pulse signal after the side edge of the time card is detected and until the bottom of the time card is detected;
• and
• a process for detecting a side length of the time card at which a cut-out is formed, having a first cut-out formed at one corner of an edge of the time card and a second cut-out formed at the other corner of the edge, where a side length of the time card at which the first cut-out is formed is different from a side length of the time card at which the second cut-out is formed, based on the number of counted pulses, and determining whether the cut-out is the first cut-out or the second cut-out to determine front and back faces of the time card based on the detection.