JPS6284392A - Card reader - Google Patents

Abstract

PURPOSE:To prevent a motor from being damaged by stopping a card feed motor when a data read timing signal does not come in over a certain period. CONSTITUTION:While a motor 3 is driving, the interruption of a timer 8 is always applied to a CPU 4, and the time from the rise of a clock is counted. When the motor 5 is once driven, a card 1 is conveyed by a roller. Therefore timing marks arranged at the same interval on the card sequentially pass through a sensor 2, and the clock signal can be obtained from a reproduction circuit 3 at every specified period. If all the timing marks completely pass, and the card 1 stops in halfway due to some force, the sensor 2 cannot detect a timing signal, and the clock reproduction circuit 3 does not transmits the signal to the CPU 4. Thus it cannot apply resetting to the timer 8, and the timer interruption applies to the CPU 4. Receiving the interruption, the CPU 4 stops the drive of the motor 5.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a card reader.

[Prior Art] Conventionally, there are mainly two types of devices that drive a card feeding motor only when a card is inserted. One is to detect the presence or absence of a card using a microswitch, as shown in Japanese Utility Model Application Publication No. 57-46954, and the other is to optically detect the card using a dedicated photointerrupter. It is.

[Problems to be Solved by the Invention] All of the above methods require dedicated parts for detection and are complex in structure. Furthermore, if the card gets stuck during card feeding or if feeding is interrupted by some external force, the motor continues to rotate, and if this continues for a long time, there is a risk of damage to the motor.

The present invention does not require special parts, and the motor is stopped when the card stops.

[Means for Solving the Problems] The present invention provides a control means for controlling the drive of the motor depending on whether or not the output of the detection means for detecting the timing mark formed on the card arrives within a certain period. It is something.

[Embodiment In FIG. 1, 1 is a card, and mm is a timing mark for reading data. 2 is a reflective photo sensor for timing mark detection, 3 is a clock regeneration circuit, 4 is a reflective photo sensor for detecting timing marks;
is a CPU that performs various controls.

5 is a card feeding motor, 6 is a motor drive circuit, and 7 is a card feeding roller. 8 is a timer, which is set to a time slightly longer than the cycle of the clock from the clock regeneration circuit 3 when the bood is being sent.

Next, the operation will be explained with reference to the flowchart shown in FIG. The timing mark at the beginning of the card is arranged so that it passes the sensor 2 when the card 1 is inserted into the roller 7. Therefore, a clock is generated by inserting the card and is transmitted to the CPU 4. Upon the rise of this clock, the CPU 4 clears the timer 8 and issues a command to drive the motor 5, so that the card is fed by the roller 7.

On the other hand, while the motor is being driven, the CPU is always interrupted by a timer, and the time from the rise of the clock is measured.

Once the motor 5 is driven, the card is fed by rollers, so that the timing marks placed at equal intervals on the card pass the sensor 2 one after another, and the clock is regenerated at a constant cycle.

The timer 8 is cleared at the rising edge of each clock, and the motor 5 continues to rotate.

The data on the card is read using timing marks.

If all the timing marks have passed or if the card is stopped midway due to some force, the clock will no longer be generated and the timer will not be cleared. When the contents of the timer reach the set value, the drive signal for the motor 5 is stopped, and the rotation of the motor is stopped.

Therefore, no unreasonable load is placed on the motor and no damage is caused.

Note that a hole punched in the card may be used as the timing mark, and in this case, a transparent type sensor is used as the sensor.

[Effects of the Invention] According to the present invention, the motor is driven while the output is being generated at a constant cycle by the timing mark for data reading, and the motor is stopped when the output stops, so that the card detection is easy. There is no need for special parts for this, and since the motor stops when the card stops midway through, undue stress is not placed on the motor and damage can be prevented.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation. 1...Card m...Timing mark 2...Sensor 3...Clock regeneration circuit 4...CPU 5...Motor and above

Claims (1)

[Scope of Claims] Detecting means for detecting a timing mark for reading data formed on a card; and a motor for driving the card while the detecting means is generating an output within a certain period; A card reader comprising: control means for stopping the motor when no output is received for a predetermined period or more.