JPS61105675A - Card read/detection circuit - Google Patents

Abstract

PURPOSE:To make it possible to detect an error even in a case where a card is destroyed from the edge to the information area, by checking the ''bright'' and ''dark'' of card information after an elapse of certain time from the time when the destroyed position of the card is observed. CONSTITUTION:When a card which is destroyed from the front edge to a part of information area is read by a card information reading head 5 to the direction shown by the arrow, A signal (e) which is outputted after an elapse of a specified period from the time when a signal (h) which is issued at the time corresponding to 80 columns counting is the check timing after 80 columns counting from the destroyed card edge point X to the direction of thick arrow. A card end edge signal (d) is shorter to the extent that the card is destroyed and is turned to logical ''1'', and a triggerable flip-flop output signal 1 is logical ''1'', and then an error is detected. Next, when a card makes a slip because of the destruction card edge, the signal (d) at the end of the card becomes long, and an output (f) of an inverter 15 is logical ''1'' level, and AND condition is materialized when a shift register output (g) is logical ''1'', and it becomes logical ''1''.

Description

[Detailed Description of the Invention] [Field of Application of the Invention J The present invention is concerned with detecting errors in card reading devices that read damaged cards from the leading edge of the card to the inside of the data area. The present invention relates to a check circuit suitable for preventing erroneous readings when holes are not normal.

[Background of the invention]

As described in Japanese Patent Application Laid-Open No. 153550/1983, the conventional device requires a step 2 to read the form information under the condition that the form diameter class is not detected within the form trailing edge detection period corresponding to a predetermined clock signal. This has made it possible to detect slippage of multiple forms and cases where the length of the form has become short. However, no consideration has been given to slippage in the case where a portion of the information from the leading edge of the form to the inside of the card information area is damaged, or if the leading edge of the card is crushed.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a check circuit that always detects a card that is damaged from the leading edge of the card to the inside of the card information area as an error without misreading the card.

[Summary of the invention]

Regarding card reading, we determined that there would be no problem if we checked the information reading within the standard card dimensions, but when using the same card many times, after the tip of the card gets crushed,
A damaged card may be read as is. Previously, the problem was that cards that were damaged from the tip of the card to the inside of the card information area were not detected as an error and were read incorrectly. Such cards may cause serious problems such as data corruption or data loss. The present invention is a circuit that has a function of detecting an error whenever information is damaged from the tip of the card to the inside of the card information area.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. FIG. 1 schematically shows the configuration of the card reading device, and FIG. 2 shows the arrangement of the information reading elements and the direction in which the card advances. FIG. 3 shows a card reading detection circuit according to the present invention, FIG. 4 is a time chart showing its normal state, FIG. 5 shows an example of card damage and the direction of card movement. The figure shows the direction of movement of a card that is damaged from the tip of the card to part of the data area, and the information reading element. Figure 6 shows a time chart when the damaged card is read. Figure 7 shows the time chart when the damaged card is read. A time chart is shown when a slip occurs when reading card information with a crushed card tip.

In Fig. 1, 1 is a card, 2 is a hopper, 3 is a card transport roller, 4 is a clock generator, 5 is a card information reading head, 6 is a light source lamp, and 7 is a device that detects the range from the front edge to the rear edge of the card. Element 8 represents a card information reading element.

Card 1 to be read is placed in hopper 2, and the card is placed in hopper 2.
The cards are sent one by one to the card transport rollers from the front side. The card conveyance roller rotates at a constant speed, and the card 1 is sent to the card information reading head 5, and the read card 1 is stored in the stacker 9.

The card information reading head is ROW Y as shown in Figure 2.
-ROW 9 consists of 12 elements for cards 1 to 80
Read column information one column at a time. Also included is an element 7 that detects the range from the front edge to the rear edge of the card. The advancing direction of the card is the direction of the arrow in FIG.

In the card reading detection circuit of the present invention shown in FIG.
5 is set by a clip 70 with a signal C indicating the range from the front edge to the rear edge of the card, and is reset by a signal P delayed by a predetermined time from the rear edge of the signal C.

11 is within the range of the output condition 13, and the signal N which is counted up by the clock pulse b generated at the center position of each column of the card and output when 80 counts is inputted to the NOR gate 12. Further, the output signal of 13 is also input to the NOR gate 12. Therefore, at the time when the 7' flip-flop 13 is reset, the system register 10. triggerable 7
Lip flops 14 and 17 are all reset.

The shift register 10 is reset by the output number of the NOR gate 12 by the output of the counter 11, and the shift register 10 is reset with the output number of the NOR gate 12 by the output of the counter 11.
It is gated by the output signal 3 and is shifted by the clock signal α obtained by the clock generator 4 synchronized with the conveyance roller 3 in FIG. 1, and the output of the shift register 10 is obtained at the beginning of 0<1<1. Also, when the signal d indicating the brightness or darkness of the information hole at the rear end of the card is logic ``1'' and the output e of the system register 10 is logic ``1'', the triggerable 7 lip 70 tab 14 is set. An output l is obtained. Also, a signal f obtained by inverting the signal d by the inverter 15 and a register output ?
When the AND output k is at the logic level "1" and the output 0 of the register 10 is at the logic level "1", the triggerable flip-flop 17 is set to obtain the output m.

FIG. 4 shows a time chart when reading a card under normal conditions. From the signal that is output when the 80th column is counted, the signal that is output after a predetermined period of time is the signal e that is output in the ``dark'' part and the signal that is output in the ``bright'' part. is obtained.

From the circuit diagram in Figure 3, checking the "dark" part at the rear end of the card is to check the "dark" part (signal d) of the information hole at the rear end of the card.
) That is, when the logic level is 0, the check signal of the output e of the shift register 10 immediately becomes the logic 1', so the triggerable flip-flop 14 is not set and the output l is at the logic 0 level. Also, check the bright part of the rear end of the card by checking the bright part of the information hole (signal f) at the rear end of the card.
) cannot be ANDed with the shift register 10 output 1 because it is at the logic level 01, and even if the shift register 10 output O signal is input, the triggerable flip 70 knob 17 is not set, and the output m is at the logic 10 level. .

On the other hand, as shown in Fig. 5, when a card that is damaged from the tip of the card to part of the card information area is read in the direction of the arrow by the card information reading head 5, the signal output when 80 force rams are counted is determined. When checking using the signal e that is output after a certain period of time has elapsed, the check timing is from the time when 8 degrees have been counted in the middle direction from the damaged part X point of the leading edge of the card shown in FIG. The signal will be shorter by the amount of time it was damaged.
If the output signal of the triggerable flip-flop is already at the logic level "1", the error detection is performed.

Next, Fig. 7 shows that if the leading edge of the card is crushed and the card slips, the signal d becomes dark 1 at the rear edge of the card.
Therefore, the output f of the inverter 15 is a logic '
1 level, and when the system register output f is logic ``1'', the AND condition is satisfied and becomes logic ``1''. On the other hand, the register output 0 is input to the logic ``11'' level removable flip-flop 17 and is set as shown in the figure, and the output m becomes the logic level ``1''.

〔Effect of the invention〕

According to the present invention, the rear end of the card can be seen through the card information hole.
, ``Dark'' is detected, so even if the card is damaged from the tip of the card to the card information area, the card information will be changed to ``Bright'' or ``Dark'' after a certain period of time after counting 80 cards from the damaged position. Don't check ``,
It becomes possible to detect errors. Furthermore, in the case of card slippage due to the collapse of the leading edge of the card, it is possible to check for ``brightness'' and ``darkness'' at the rear end of the card.

Therefore, it is possible to always detect errors in fluctuations in card feeding in the card running system.

Furthermore, although the transition from card media to other media (for example, floppy disks) is progressing, the same card is still being used as a parameter card.

Therefore, there are many cases where a damaged card is read, and this check circuit has the effect of greatly improving the reliability of card information reading.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a configuration diagram of a card reading device according to an embodiment of the present invention;
Fig. 2 is an explanatory diagram showing the arrangement of information reading elements and the direction of card movement, Fig. 3 is a card reading detection circuit diagram, Fig. 4 is a normal time chart related to Fig. 3, and Fig. 5 is a card reading detection circuit diagram. An example of damage: card information reading element, direction of card travel. An explanatory diagram showing the column count direction, FIG. 6 is a detection timing chart when the card tip is damaged, and FIG. 7 is a slip detection timing chart due to the card tip being crushed. 1...Card, 2...Hopper, 3...
・Card conveyance roller, 4...Clock generation section, 5...
・Card information reading head, 9...Stacker, 10...Sist register, 11.
... Counter, 12... Noah gate, 13... Flip-flop, 15... Inverter, 16... AND gate.

Claims (1)

[Claims] 1. A flip-flop for further extending the signal indicating the range from the front edge to the rear edge of the card by a predetermined range; a counter for counting the number of 80 card information holes;
Card slip errors caused by factors such as card tip collapse, which consists of a shift register that outputs a check signal to check "darkness" and "lightness" at the rear end of the card, and two flip-flops that detect errors at the timing of the check signal. A card reading detection circuit characterized by having both a detection function and an error detection function for cards that are damaged from the leading edge of the card to the inside of the card information area.