JP3528485B2 - Mechanism for preventing unauthorized use of time clock - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for preventing improper use of a time clock for preventing improper printing of time stamps in time fields other than the day of a time card. 2. Description of the Related Art In general, a time clock is temporarily lowered from an insertion slot formed in an upper part of a main body until a lower end of a time card inserted reaches a predetermined position. After raising it to the printing position,
2. Description of the Related Art There is known a printer which operates a printer and prints the time of attendance and departure in a date field on the day. [0003] However, in the above-described time recorder, the upper end of the time card is pressed to suppress the rise of the time card, or the upper end of the time card is forcibly lifted by grasping the upper end of the time card. By forcibly changing the position of the time card corresponding to, illegal printing could be performed in places other than the current day column. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a mechanism for preventing unauthorized use of a time recorder for controlling the sending of a time card to prevent unauthorized use of a time recorder for printing data other than the date column of the day. And [0005] In order to solve the above-mentioned problems, a mechanism for preventing unauthorized use of a time clock according to the present invention uses a time card inserted from an insertion opening formed in an upper portion of a time clock main body to read the time card. A time recorder that moves the date column until it reaches the position of the printer and prints the time of attendance and departure, and monitors the moving speed of the time card. If the moving speed of the time card is different from a predetermined speed, the printer activates the printer. A mechanism for preventing unauthorized use of a time clock, wherein the time card is forcibly ejected without being operated. FIG. 1 is a perspective view of a front side of a time recorder. As shown in FIG.
Time card insertion slot 2 at the top of the time recorder body 1
And a pair of feed rollers 5 for moving the time card 3 inserted from the insertion port 2 to a predetermined position along the time card path 4 at the center thereof.
When the time card 3 is inserted from the sensor 6, when the sensor 6 near the feed roller 5 detects that the time card 3 is inserted, the control unit 7 rotates the motor 8 to rotate the feed roller 5, and To the second sensor 9
When the lower end of the time card 3 is detected, the motor 8 is reversed, the feed roller 5 is reversed, and the feed roller 5 is moved up to a predetermined position, and the printer 10 prints the date, the time of attendance and departure in a predetermined column of the time card 3. Thereafter, the feed roller 5 is rotated again in the discharge direction to discharge the time card 3. The feed amount of the time card 3 is determined by the rotation amount of the feed roller 5, but as shown in FIG.
A rotary encoder 12 is provided coaxially with the rotary shaft 10 of the first embodiment. A signal (pulse) output from the rotary encoder 12 is input to a control unit 7 composed of a microprocessor, and the control unit 7 stores the signal (pulse) in a memory. The number of pulses input according to the control program is counted, the feed amount of the time card 3 is measured, and when it is determined that the predetermined amount has been sent, the motor 8 is stopped, the printer 10 is operated, and the date on the date card 3 It is configured to print the clock-in / out time. The controller 7 counts the pulses output from the rotary encoder 12 and simultaneously monitors the pulse width and cycle to monitor the time card moving speed. Since this moving speed is proportional to the rotation speed of the feed roller, the output pulse P when the feed roller is rotating at a predetermined speed has a fixed pulse width T1 and a fixed period T2 as shown in FIG. However, when the rotation speed increases, the pulse width t1 and the cycle t2 of the output pulse P1 decrease, and when the rotation speed decreases, the pulse width t1 of the output pulse P2 increases and the cycle t2 also increases. . This output pulse is monitored by constantly measuring the pulse width t1 from the rising edge of the pulse to the falling edge and the period t2 from the rising edge of the pulse to the rising edge of the next pulse. The width t1 is compared with the reference cycle T2 and the cycle t2, respectively. When a difference exceeding an allowable error occurs in any of them, some external force is applied to the time card 3, and the drive system (feed roller 5) operates normally. It is configured that the time card 3 is ejected by forcibly rotating the motor 8 in the card ejection direction upon judging that the moving speed of the time card 3 has been disturbed because it cannot be performed. In FIG. 3, reference numeral 13 denotes a driver circuit for driving the motor, 14 denotes a gear for transmitting the rotation of the motor 8 to the feed roller 5a on the driving side, 15 denotes an AC power supply,
Denotes a power transformer, and 17 and 18 denote rectifier circuits for supplying DC power to the respective circuits, motors and the like. According to the time clock having the above structure, when the insertion of the time card 3 from the insertion slot 2 is confirmed by the sensor 6, the motor 8 is rotated (forward rotation) in the card suction direction, and the second sensor 9, when the lower end of the time card 3 is detected, the motor 8 is rotated in the card ejection direction (reverse rotation), and at the same time, the counting of output pulses of the rotary encoder 12 is started, and the pulse width t1 and cycle t2 of the output pulse are started. And measure. When the feed roller 5 rotates normally and the time card 3 is fed at a predetermined moving speed, the width and the cycle of the output pulse of the rotary encoder 12 are almost constant. Then, when the feed roller 5 rotates by a predetermined amount and the date date column on the time card 3 reaches the printing position of the printer 10, the rotation of the motor 8 is stopped once and the time card 3 is stopped. 10 is operated to print the time of starting and leaving at a predetermined position on the time card 3, and when the printing is completed, the motor 8 is again rotated in the card discharging direction to discharge the time card 3, and a series of printing operations is completed. However, in order to falsify the clock, the user forcibly lifts or holds down the time card 3 in order to print the clock in the date field of the previous day or the date field of the next day. In this case, the feed roller 5a cannot rotate normally, and when the time card 3 is pulled from above, the moving speed of the time card 3 is increased, so that the rotation of the feed roller 5a is increased and the rotary encoder 12 does not rotate. When the output pulse P1 having a reduced pulse width or cycle is output and the moving speed is reduced by pressing the rise of the time card 3 from above, the rotation of the feed roller 5a is slowed and the pulse width or cycle is output from the rotary encoder 12. The longer output pulse P2 is output, and the disturbed output pulse P1 or P21 is input to the controller 7.
The control unit 7 compares the pulse width t1 of the output pulse P1 or P2 with the reference pulse width T1, and outputs the output pulse P1 or P2.
2 and the reference period T2, and when any one of the differences exceeds the allowable range, it is determined that some external force is applied to the time card 3 and an illegal operation is about to be performed, and the pulse counting is performed. Does not operate the printer 10 even if the count reaches a predetermined count, the motor 8 is forcibly rotated in the card discharging direction, and the time card 3 is discharged without printing the clock. As described above, even if the time card 3 is forcibly stopped at a position other than the correct position and an attempt is made to print improperly,
The fact that some external force is applied to the time card 3 is judged from the disturbance of the output pulse of the encoder 12 (the disturbance of the moving speed of the time card 3), and the time card 3 is forcibly ejected without printing. Can be prevented. Although the rotary encoder is configured to interlock with the driving-side feed roller 5a, as shown in FIG. 5, the rotary encoder may be interlocked with the rotation shaft of the driven-side feed roller 5b. In this case, since the feed roller 5a on the driving side is directly rotated in conjunction with the motor 8, the feed roller 5b on the driven side is rotated through the movement of the time card 3. 3 can be detected more reliably. Further, a rotary encoder which operates in conjunction with each other may be provided on both rotating shafts on the driving side and the driven side of the time card feed roller. In this case, a two-phase pulse output type encoder capable of detecting the forward and reverse rotation directions is used, and it is determined whether the time card is pulled or pushed based on the rotation direction and the suction / discharge state of the time card. If it is determined that an external force has been applied to the time card, the motor may be forcibly rotated in the card ejection direction. In the above-described time recorder, the moving amount and moving speed of the time card are detected by the rotary encoder, but may be detected by the linear encoder. Furthermore, a voice synthesizing circuit (not shown) may be operated to output voice data stored in the memory as a warning or caution message from a speaker to prompt an appropriate operation. According to the time recorder described above, unauthorized use is prevented, and the time card feed mechanism is smoothly moved due to the occurrence of a failure in the time card feed mechanism or the entry of foreign matter into the time card path. When the output pulse of the rotary encoder is disturbed, the output can be performed without printing on the time card even when the output pulse of the rotary encoder is disturbed. According to the present invention, it is possible to forcibly change the printing position by pulling or pushing the time card inserted from the insertion slot of the time clock against the feed force of the feed roller. It is determined from the moving speed of the card whether external force is applied or not to the time card, and when it is determined that external force is applied, it is forcibly ejected without printing, so that unauthorized use of the time clock is surely performed. Can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a time clock according to the present invention. FIG. 2 is a cross-sectional view of a main part of the time clock. FIG. 3 is a block diagram showing a configuration of an unauthorized use prevention mechanism. FIG. 5 is a block diagram showing another example of an unauthorized use prevention mechanism. [Description of References] 1 Time recorder main body 2 Insertion opening 3 Time card 5 Feed roller 7 Control unit 8 Motor 10 Printer 12 Rotary encoder

Claims (1)

(57) [Claims] [Claim 1] A time card inserted from an insertion slot formed at an upper part of a time clock main body is moved until a date column of the day reaches a position of a printer, so that a clock-in / out time is set. In the time recorder for printing, the moving speed of the time card is monitored, and when the moving speed of the time card is different from a predetermined speed, the time card is forcibly ejected without operating the printer. Unauthorized use prevention mechanism.