Front/back discrimination device for time card, time recorder provided with same, front/back discrimination method for the time card, and program
A time recorder includes a first sensor that detects the side edge of a time card having a cut-out formed at at least one corner of the bottom, a second sensor that detects the bottom of the time card, and a card feeding unit that feeds the time card. When the time card is fed by this card feeding unit, a pulse counter of the card feeding unit counts the number of pulses of predetermined pulse signals after the first sensor detects the time card and until the second sensor detects the time card. Next, the front and back faces of the time card are determined based on the number of pulses that is a counting result. Hence, the front and back faces can be determined by the first sensor and the second sensor only.
1. A time card front/back discrimination device that determines 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 is 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 device comprising:
a first detector that detects a side edge of the time card when the time card is fed into the time card front/back discrimination device;
a second detector that detects a bottom of the fed time card;
a pulse counter that counts a number of pulses of a predetermined pulse signal after the first detector detects the time card and until the second detector detects the time card; and
determining means which detects a side length of the time card at which a cut-out is formed based on the number of pulses counted by the pulse counter, and which determines 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.
2. The time card front/back discrimination device according to claim 1 , wherein
the first detector is disposed at a position near one side of a feeding path of the time card, and overlapping the cut-out of the fed time card, and detects the fed time card,
the second detector is disposed at a position near an end of the feeding path of the time card, and is not overlapping the cut-out of the fed time card, and near the bottom of the time card over the first detector, and
the second detector detects the time card after the first detector detects the time card.
3. The time card front/back discrimination device according to claim 1 , further comprising a motor for feeding the time card,
wherein the pulse signal comprises a drive pulse for driving the motor.
4. The time card front/back discrimination device according to any one of claim 1 , further comprising feeding means for feeding the time card,
wherein the feeding means changes a feeding direction of the time card based on the detection by the second detector.
5. The time card front/back discrimination device according to claim 1 , further comprising measuring means for measuring a date and a time,
wherein the pulse signal is generated by the measuring means.
6. A time recorder comprising:
the time card front/back discrimination device according to claim 1 ; and
a printing unit that prints a date and a time on the time card based on a determination result by the time card front/back discrimination device.
7. The time card front/back discrimination device according to claim 1 , wherein the determining means:
sets a first reference value and a second reference value corresponding to the number of pulses counted by the pulse counter;
determines that, when the number of pulses is greater than the first reference value, the time card is upside down; and
determines whether or not the number of pulses is smaller than the first reference value and is greater than the second reference value to determine the front and back faces of the time card.
8. A time recorder comprising: the time card front/back discrimination device according to claim 7 ; and a printing unit that prints a date and a time on the time card based on a determination result of the time card front/back discrimination device.
9. 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.
10. 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.