JPS6120439B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an apparatus for printing serial numbers with check digits on documents such as slips. Securities such as stocks, bonds, checks, promissory notes,
Alternatively, office processing slips such as purchase orders, receipt orders, delivery notes, invoices, receipts, and other various documents are often printed with numbers, and these numbers are used as identification numbers unique to the documents. In order to accurately manage these conventional numbers, a mathematically calculated number called a check digit is added to some of them. If you use a number with a check digit, it is possible to check whether the number is entered correctly when entering it into a computer, etc. For example, if the wrong number is entered due to a keystroke error, the input device will can be detected automatically and a warning can be issued using a buzzer or the like. There are various check digit systems used for this purpose, one of which is Modulus 10.
There is a check digit system commonly referred to as a check digit system. This multiplies each digit of a given number by a different weighting value called a weight coefficient, calculates the sum of the products for each digit, and then checks the value obtained by subtracting the above sum from the smallest multiple of 10 that is greater than this sum. That is. A system similar to this is a check digit system called Modulus 11, which, like Modulus 10, multiplies each digit value by a weight coefficient, calculates the sum of the products, and then calculates the number of 11 that is greater than the sum. The value obtained by subtracting the above sum from the minimum coefficient is used as the check digit. There are many variations of such check digit systems with modulus 10 and modulus 11. For example, the weight coefficients used can take various values, and the sum can be calculated after calculating the sum. You can also divide by 10 or 11 and use the remainder as the check digit. An example of one of these check digit systems is a modulus 10 check digit system called Runes Check. This is done by multiplying each digit of a given number, for example "123456", by a weighting factor of "1, 2, 1, 2, 1, 2".
Find the sum of each digit of the product. That is, (1, 2, 3, 4, 5, 6) × (1, 2, 1,
2,1,2)=(1×1,2×2,3×1,4×
2,5×1,6×2)=(1,4,3,8,5,
12), and the sum of each digit is 1+4+3+8+5+
1+2=24, and the product is 2 like (6×2=12)
When the number of digits is reached, break down each digit and calculate the sum as 1 + 2), then subtract the above sum 24 from the minimum multiple of 10, 30, which is greater than this sum 24 (30 - 24 =
6), this "6" is the check digit. The check digit "6" thus obtained is added to the rightmost side of the given number "123456", and the number with the check digit is expressed as "1234566". When the check digit of such a runes check is added to the serial number, the value becomes as shown in Table 1, for example.

【table】

[Table] By the way, the check digit system with modulus 10 has weight coefficients "1, 3, 1, 3, 1,
3", "1, 3, 7, 1, 3, 7", "9, 8, 7,
4, 3, 2'', ``7, 6, 5, 4, 3, 2'', etc. Also, in the check digit system with modulus 11, the weight coefficients ``7, 6, 5, 4, 3,
2" is commonly used. For example, if the given number is "123456" and the weight is "7, 6,"
5, 4, 3, 2'', (1, 2, 3, 4, 5, 6) x (7, 6, 5,
4, 3, 2) = (7, 12, 15, 16, 15, 12), and the sum of the products is 7 + 12 + 15 + 16
+15+12=77, and by subtracting the sum 77 from the smallest multiple of 11, 88, which is greater than the sum 77, we get 88-77=11. Here, if the calculated check digit is 10 or more, 10 is further subtracted from this value, 11-10=1 is used as the check digit, and the number with check digit is set to 1234561.Alternatively, the symbol × etc., and the number with the check digit in this case is
It becomes 123456X. When using the check digit number of modulus 10 or modulus 11 calculated in this manner as an identification number for a form, etc., a special device is required to print the number. In other words, it is necessary to have a device that performs the above-mentioned calculations based on the given number and obtains the value of the check digit, and a device that prints this check digit on printing paper such as a billboard. It is necessary to attach it to a printing machine, collation machine, etc. and print the number on it. As a conventional device for automatically printing a number with a check digit such as modulus 10 or modulus 11, the device disclosed in US Pat. No. 3,734,010 is known. This printing device has a structure in which a type wheel for printing serial numbers and check digits is driven by a pulse motor, and is equipped with a complicated control device for driving this pulse motor. Further, as other printing devices, for example, US Pat. No. 3,603,251 and No. 3,815,495 are known.
These printing devices selectively project a plurality of pneumatically or electrically driven solenoid devices to drive the check digit type wheel of a rotating number printer by pressing against the drive arm of the check digit type wheel. In addition, the serial number type wheel is driven by a separate cam device. However, all of these conventional number printing devices have a structure that integrates a serial number printing mechanism and a check digit printing mechanism, which requires many complex structures to be incorporated into a small space, and the entire printing device This has the disadvantage of complicating the process and increasing manufacturing costs. In addition, even if a failure or abnormality occurs in these printing number devices while the printing device is in operation, and if it becomes necessary to disassemble, repair, or assemble the device, it will take a lot of time and effort due to its complex structure. Furthermore, when changing the font of the numbers, it is necessary to create a new printing device or replace all the type wheels. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a printing device for serial numbers with check digits which does not have the above-mentioned disadvantages. This invention will be explained below. First, an outline of an office form printing machine and a collating machine to which the present invention can be applied will be explained. As shown in Fig. 1, the printing machine has a paper feed unit 1,
It consists of a plurality of offset or letterpress printing units 2, a rubber plate unit 3, a number printing and auxiliary printing unit 4, a punching unit 5, a terminal unit 6 consisting of a horizontal sewing machine, a vertical sewing machine and a slitter, a folder unit 7 and a rewind unit 8. The paper 9 in the form of a winding roll is printed in several colors, carbon copy machine printing, number printing, file holes, marginal holes, horizontal perforations, vertical perforations, and finishing with slits on both ends of the paper. Further, in the case of winding paper delivery, the paper is sent to the rewind unit 8, and in the case of folding paper delivery, the paper is folded and delivered to the folder unit 7.
The printing machine shown in FIG. 1 can manufacture all kinds of office forms because each unit can be selected and used according to the specifications of the office form, and it is rotary type. This allows high-speed printing and high printing efficiency. Also,
If a numbering device is attached to the number printing and auxiliary printing unit 4, consecutive numbers can be printed at high speed at the same time as form printing, improving the production efficiency of office forms.
Therefore, the collating machine in Fig. 2 is printed by the above-mentioned printing machine,
It collates processed paper into multiple sheets,
It is composed of a plurality of sheet feeding units 10, a feeding and gluing unit 11, a number printing unit 12, a slitting unit 13, a sewing machine processing unit 14, a zigzag folding unit 15, a delivery unit 16, and a sheet cutting unit (not shown). Load multiple sets of roll paper discharged from the printing machine,
Gluing is applied to each sheet, and the sheets are adhered to each other while aligning the printing positions, thereby producing a set of office forms made up of a plurality of sheets. Furthermore, like a printing machine, this collating machine can also perform number printing, slitting, sewing, etc. by selectively using each unit.
Paper binding processing, sheet cutting processing, etc. can be performed simultaneously or in any combination, and can be adapted to various forms of office forms. The printed paper fed to the collating machine is marginally punched on both ends in the printing machine, and alignment for collating is done at these marginal punch holes. If it is unnecessary, it can be removed by slitting it, and if it is folded and fed, it can also be cut into sheets. In this case, if a numbering machine is attached to the character printing unit in such a collating machine as well as a printing machine, consecutive numbers can be printed at the same time as collating. In this case, the same number is printed on each sheet, so Mistakes such as different paper numbers cannot occur. Further, FIGS. 3A to 3C show an example of a form produced according to the present invention, and A shows a part of a sheet on which a form is printed by a printing unit of a printing machine. A timing mark "D" for each unit format is printed on a part of the margin of the paper, and B is a consecutive number ("12346" in the figure) by the number printing unit of the printing or collating machine. "12345" is printed, C is the consecutive number "12341",
Check digit "4" corresponding to "12340",
``6'' is printed in the check digit column. FIG. 4 shows a schematic diagram of the external configuration of the serial number printing unit used in the present invention, in which a plurality of number units 21 are fixed radially around a rotating shaft 20 via a mount ring 22. , these number devices 21 engage with cam grooves 24 of a cam device 23 disposed on that side, so that the number devices 21
While rotating, the character wheel 25 is rotated by the character wheel return claw. In this manner, ink is applied to the surface of the letters on the letter wheel 25 by the inking device 26, and the letters are pressed against the paper 27 to print a serial number as shown in FIG. 3B. Note that the number of number devices used in such a serial number printing unit is related to the top and bottom dimensions of the form.
The number is calculated by dividing the rotational circumference of the number plate by the vertical dimension. The paper on which the serial numbers have been printed is led to a check digit printing unit as described below, where a check digit is printed. Check digit printing mechanism 10 according to the invention
0 as shown in FIGS. 5 to 8, and as shown in the schematic perspective view of FIG.
The characters on this type plate 101 are arranged in a line (for example, in the vertical direction) parallel to the conveyance direction of the paper 100A. In addition, the ink ribbon 102 passes from the delivery reel 103 to the ribbon conveyance roller 104 to cover the typeface of the type plate 101, and passes through the conveyance roller 105 to the take-up reel 1.
06. Furthermore, ink ribbon 1
The motor 107 for hoisting 02 is the transmission mechanism 1
08 to the ribbon conveyance roller 104, conveyance roller 105, delivery reel 103, and take-up reel 10.
6. On the other hand, a hammer device 109 and a solenoid device 110 are arranged on the back side of the paper 100A so as to face the type plate 101. Incidentally, the type plate 101 has a structure as shown in FIGS.
) are arranged vertically in a row. Similarly,
The hammer device 109 and the solenoid device 110 each have 11 printing elements (hammers and solenoids) arranged facing each other, and both of these 11 printed characters and each printing element are arranged at a constant rate with respect to the conveyance direction of the paper 100A. spacing, for example 1/4 inch (approximately 6.35
mm) arranged in pitch and usually used
Typefaces of various sizes, including OCR MICR typefaces, can be incorporated into the check digit printing mechanism 100. As shown in FIGS. 6 and 7 showing details of the check digit printing mechanism 100, the check digit printing mechanism 100 is fixed to frames 112, 112A and 113, 113A disposed on both sides, and the interval between these frames is The width is at least equal to or larger than the width of the paper 100A, and a mounting member 114 for fixing to a part of a number printing unit of a printing machine or a collating machine is provided on the lower surface. Further, roller-shaped paper guide devices 115, 116,
Both ends of 117 and 118 are connected to frames 112 and 11
2A, 113, 113A, paper 100
The shafts 119 and 120 are designed to support the printing device, respectively, and the shafts 121 and 1
22 is threaded and incorporated into the lower end of the printing device to engage threaded portions 123 and 124. Gears 125 and 126 are attached to one end of the shafts 121 and 122, and are engaged with each other via transmission gears 127 and 128 located between them. Furthermore, a handle for rotating the shafts 121 and 122 is provided at the other end of the shaft 121, and by rotating this handle, the shaft 121 rotates and the gear 12 is rotated.
5, 127, 128, and 126, the printing device engaged with the shafts 121 and 122 via the screw members 123 and 124 is axially fed along the shafts 121 and 122, and the paper is The number is adjusted to the upper printing position. Thus, the printing mechanism is mounted on the frame 12 separately provided on the screw members 123 and 124.
9 and 130, and frame 129
includes a type plate 101, an ink ribbon 102,
Delivery reel 103 and take-up reel 106 of ink ribbon 102, ribbon conveyance rollers 104 and 10
5, a motor 107, etc. are incorporated, and a hammer device 109, a solenoid device 110, etc. are incorporated in the frame 130. Note that the hammer device 109 includes 11 hammers 131 provided facing each type on the type plate 101, and a hammer shaft 1 that serves as a fulcrum for these hammers 131.
32 and 133, and a shaft 136 that supports a spring 135 that tensions the hammer 131.
The solenoid device 110 is composed of 11 solenoids 134 for operating each of these hammers 131. In addition, frames 112, 112A and 113, 1
13A is coupled by an engaging member, and the paper 100
When A is set, the frames 112 and 112A are separated from each other around the axis P position shown in FIG.
Paper 100A can be installed between hammer device 109 and type plate 101. Therefore, the upper end of the frame 129 is connected to the shaft 1.
19, each supported by a shaft 121 having a threaded lower end, these shafts 119, 12
It is held so that it moves along 1. Further, the type plate 101 is attached to the paper facing surface of the frame 129, and the conveyance rollers 104, 104 from the delivery reel 103 are mounted on the front surface of the type plate 101.
An ink ribbon 102 is disposed to be delivered to a take-up reel 106 via the ink ribbon. A hammer device 109 and a solenoid device 11 are provided in the frame 130 to face the type plate 101.
0 is attached, and its hammer 131 engages with hammer shafts 132, 133 and is driven by a solenoid device 110 disposed behind it to print check digits. Further, a ribbon winding motor 107 is mounted on the frame 129, and the ribbon 102 is transported in response to a ribbon winding signal. Therefore, the ink ribbon 102 is wound once every 5 times or once every 10 times, and the timing is when the first digit of the serial number changes from 4 to 5 or from 9 to 0. It's time to become This means that if the first digit of the consecutive number is between 0 and 4 and between 5 and 9, the same check digit is
Because it never appears again. Also, 0 to 9
In a check digit system in which the same check digit does not appear twice between 9 and 9, the ink ribbon 102 is wound only when it changes from 9 to 0. This method is economical because the amount of ribbon consumed is reduced, and is particularly effective when a one-time ribbon is used. However, 100 sheets of paper
A passes between the paper guide devices 115 and 117, passes through the gap between the hammer surface below it and the ribbon 102, and then passes through the paper guide devices 116 and 1 below.
These guide devices 115 to 118 are arranged so that the paper 100 does not come into contact with the ribbon 102 or the hammer 131. By the way, the check digit printing mechanism constructed as described above is controlled by a control circuit system as shown in FIG. In other words, this control circuit system is
A pulse generator 200 that outputs a pulse signal PS indicating the travel timing in conjunction with the paper transport mechanism of a printing machine or a collating machine, and a mark that detects an arc printed on the paper 100A and outputs an arc signal MS. A detection device 300, an operation display device 400 for operating the control device, setting required numerical values such as a start number, top and bottom dimensions of a form, and displaying necessary data, a pulse signal PS from the pulse generator 200, and mark detection. The mark signal MS from the device 300 is input, the value of the check digit is calculated, and the hammer drive signal HD for printing the check digit is input.
and a print control circuit 500 that outputs an ink ribbon winding signal RS, and a mark printing alarm device 600 that outputs an alarm using a buzzer or the like when check digit printing is out of synchronization. Program tapes 700 such as perforated paper tapes and magnetic tapes, which define the system, are being introduced.
Hammer drive signal HD and ink ribbon winding signal
RS is input to the check digit printing mechanism 100 described above. Thus, the pulse generator 200 allows the light emitted from the light emitter 204 to pass through the hole 203 provided at the periphery of the disk 202 that rotates in conjunction with the roller 201 for conveying the paper 100A. By detecting the interruption with the light receiver 205, a pulse signal as shown in FIG. 11A is generated.
Get PS. The mark detection device 300 also generates pulses P ₁ and P ₂ as shown in FIG. Get mark signal MS. Furthermore, the operation display device 400 includes a tape reader 401 for reading the data of the program tape 700, a display device 402 for displaying the number being printed and other necessary data, and a display device 402 for setting the printing start number using, for example, a check digit. a start number preset device 403 for printing, and a vertical dimension preset device 404 for setting a dimension value corresponding to the vertical dimension of the paper 100A set for printing.
The data read by the tape reader 401 is input to the arithmetic control circuit 509 in the print control circuit 500, and the set value from the vertical dimension preset device 404 is preset to the print synchronization counter 502. The set value from the start number preset device 403 is preset in the print number counter 504. Further, the pulse signal PS from the pulse generator 200 is input to the synchronization signal waveform shaping circuit 501, the mark signal MS from the mark detection device 300 is input to the timing mark correctness determination circuit 505, and the pulse signal PS from the print synchronization counter 502 is input to the 11th signal waveform shaping circuit 501. A synchronization start signal SS as shown in Figure C is output to the print synchronization control circuit 50.
6 is input. Therefore, the print synchronization control circuit 5
06, a check digit printing synchronization signal CD as shown in FIG. Form 13 pulses like this. That is, these pulses are composed of a start signal St, check digit signals 0 to 9, x, and an end signal SP, and the interval T ₃ between the pulses corresponds to the interval in the paper transport direction of 11 types and hammer devices, etc. . Further, pulses such as those shown in FIG. 11F and G are obtained by inputting the pulse signal PS into a shift register or frequency division counter and combining the outputs, and the intervals T ₁ to _{T 4} of each of these pulses are as follows. If the printing press or collating machine is in steady operation and the paper speed is, for example, 60 m/min, then T ₁ ≒ 6.25 mS,
T ₄ is approximately 1.04 mS, and if the vertical dimension of the form is 3 inches to 11 inches, T ₂ is 75 mS to 275 mS. The configurations of the hammer synchronization control circuit 507 and the hammer control circuit 510 are as shown in FIG. In such a configuration, after the printing machine or collating machine with a fixed printing mechanism is ready for operation and all other units are confirmed to operate normally,
Prepare the check digit printing device for operation.
That is, data regarding the top and bottom dimensions of the form is preset in the top and bottom dimension preset device 404, and the start number of the serial number is preset in the start number preset device 403. Then, the tape reader 401 reads the program tape 700 on which data regarding the check digit calculation formula is recorded, and inputs the data to the arithmetic control circuit 509. In this way, the data of the check digit calculation formula is input to the print control circuit 500, and the preparation for operation of check digit printing is completed. Next, based on the data from the arithmetic control circuit 509 and the print number counter 504, the check digit value for the start number is calculated by the check digit arithmetic circuit 508, and the check digit value is calculated by the check digit arithmetic circuit 508, and the value is displayed on the display device 4 together with the print circuit from the print number counter 503.
Displayed on 02. However, the pulse generator 2
The pulse signal PS from 00 is waveform-shaped by a synchronization signal waveform shaping circuit 501, and then sent to a print synchronization counter 502 and a timing mark correctness determination circuit 505.
The mark signal MS from the mark detection device 300 is input to the timing mark correct/incorrect judgment circuit 505.
In order to prevent the check digital printing device from malfunctioning due to signals caused by blurred marks printed on the paper, foreign objects attached to the paper, ink stains, etc., only correct mark signals are passed through and print synchronization control is performed. It is input to circuit 506. The mark signal inputted here is inputted to a printing number counter 503 and a printing number counter 504 to count up (or count down) and set the next number. Further, the mark signal from the print synchronization control circuit 506 is combined with the pulse signal from the synchronization signal waveform shaping circuit 501 by the print synchronization counter 502 to form a synchronization start signal SS. moreover,
The print synchronization control circuit 506 outputs a check digit print synchronization signal CD consisting of 11 pulses at regular intervals that interlocks with the conveyance mechanism. At the same time, the check digit signal CH from the check digit calculation circuit 508 is input to the AND circuit, and at the same timing, the hammer drive signal HD is output, and the check digit printing mechanism 1
When the solenoid 134 of 00 is driven, the hammer 131 presses the paper 100A, and the numerical value of the check digit corresponding to the serial number is printed. Further, the mark signal from the print synchronization counter 506 resets the print synchronization counter 502, and the counter 502 starts integrating pulse signals corresponding to the vertical dimension. The print synchronization counter 502 is configured to output a synchronization start signal SS to prevent the printing apparatus from becoming inoperable if the mark signal cannot be detected for some reason. In this way, the check digit is printed as shown in FIG.
8 calculates and stores the check digit of the next number set in the print number counter 504, and all operations are held until the next mark signal is detected. The above operations are repeated continuously at the same time as the mark signal is input, and the check digits are also continuously printed. In this case, the hammer drive signal HD activates one of the solenoids 134 of the solenoid device 110 to drive the hammer 131 of the hammer device 109 to press the paper 100A against the type plate 101. At this time, the paper 100A is running continuously without stopping, and the hammer 131 is pressed for a very short time (0.5 to 2
milliseconds). Further, although the number printing fields on the paper 100A are located at regular intervals, the check digit print positions are lined up in a line in the conveyance direction, so the hammer 131 is pressed according to the number of the check digits to be printed.
Adjust the timing to match the drive timing. Note that the pairs of marks on the printing paper are used to operate the timing mark correct/incorrect judgment circuit 505. For example, the intervals between the marks are set to 1/4 inch (approximately
6.35mm), after detecting the first pulse P ₁ ,
Pulse signal PS until the next pulse _P2 is input
is calculated using a pulse counter or other device, and whether or not the mark is a correct mark is determined based on whether or not it is a prescribed number (12 in this embodiment). If the first pulse P ₁ is caused by foreign matter on the paper, ink stains, etc., the next pulse P ₂ is unlikely to be generated exactly 1/4 inch later;
In this case, the count value of the pulse counter becomes a value other than 12, which can be determined to be an error. Further, the mark interval T ₂ of the mark signal MS corresponds to the vertical dimension of the form, and this interval T ₂ changes slightly depending on uneven printing of the marks and expansion and contraction of the paper. Therefore, the pulse signal from the pulse generator 200
Electrically detects the top and bottom dimensions of the form using PS,
The print synchronization counter 502 that generates the synchronization start signal SS is always corrected with a correct mark signal. Furthermore, according to the apparatus of the present invention, even if a mark in the correct position is determined to be an error mark due to blurred ink, etc., the print synchronization counter 502 outputs an auxiliary synchronization start signal SS. Therefore, the device will not become inoperable. If ink smearing on the mark continues to occur, the mark printing device 600 issues a warning of insufficient ink density. As described above, according to the serial number printing apparatus with check digits of the present invention, serial numbers can be printed using a conventional printing apparatus, and check digits can also be printed using a check digit printing apparatus having a simple configuration. In addition, the check digit printing device of the present invention has fewer moving parts than conventional ones, making the device more durable and reliable, and since there are fewer moving parts, the operating speed of the printing device can be increased. At the same time, printing efficiency can be improved. Furthermore, since the check digit printing device of the present invention has a simple configuration, it is easy to change the font and has good workability, and since errors are prevented using both pulse signals and mark signals, malfunctions may occur in the control system. There is no problem, and no misalignment occurs.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a printing press to which this invention can be applied, FIG. 2 is a diagram showing a schematic configuration of a collating machine to which this invention can be applied, and FIG. 3 is a diagram showing a schematic configuration of a collating machine to which this invention can be applied. FIG. 4 is a diagram showing an outline of the serial number printing device used in the present invention; FIG. 5 is a diagram showing an outline of the check digit printing mechanism of the invention; FIG. 7 is a plan view thereof, FIG. 8 is a diagram showing the structure of the type plate according to the invention, FIG. 9 is a block diagram showing an example of the control system of the invention, and FIG. FIG. 11 is a circuit configuration diagram showing some details thereof, and a time chart showing an example of its operation. 1, 10...Paper feed unit, 2...Offset printing unit, 3...Rubber plate unit, 4...Number printing/auxiliary printing unit, 5...Punching unit, 6...Terminal unit, 7...Holder unit, 8...Rewind unit, 12 Number printing unit, 13... Slitter unit, 14... Sewing machine processing unit, 20... Shaft, 21... Number device, 22... Mount ring, 24... Cam groove, 25
... Character wheel, 26 ... Inking device, 100A ... Paper, 101 ... Type plate, 102 ... Ink ribbon, 103 ... Delivery reel, 104, 105 ... Ribbon conveyance roller, 106 ... Take-up reel, 107 ... Motor, 108 ... Transmission mechanism, 109... hammer device, 110... solenoid device, 111... typeface,
112, 112A, 113, 113A...Frame, 114...Mounting member, 115-118...Paper guide device, 119-122...Shaft, 123,
124...Screw member, 125-128...Gear, 12
9,130...Frame, 131...Hammer, 13
2,133...Hammer shaft, 134...Solenoid, 135...Spring shaft, 200...Pulse generator, 300 Mark detection device, 400...Operation display device, 500...Print control circuit, 600...Mark printing alarm device, 700...Program tape , P.S.
...pulse signal, MS...mark signal, HD...hammer drive signal, RS...ink ribbon winding signal, 100
...Check digit printing mechanism, 201...Roller,
202...Disc, 203...Hole, 204,301
... light emitter, 205, 302 ... light receiver, 401 ... tape reader, 402 ... display device, 403 ... start number preset device, 404 ... vertical dimension preset device, 501 ... synchronization signal waveform shaping circuit,
502...Print synchronization counter, 503...Print number counter, 504...Print number counter, 505
... Timing mark correct/incorrect judgment circuit, 506... Print synchronization control circuit, 507... Hammer synchronization control circuit,
508...Check digit arithmetic circuit, 509...Arithmetic control circuit, 510...Hammer control circuit, 511
…Ink ribbon control circuit, SS…Synchronization start signal, CD…Check digit printing synchronization signal, CH…
Check digit signal.

Claims (1)

[Claims] 1. A pulse generator that generates a pulse signal in conjunction with a printing paper conveyance mechanism, a mark detection device that detects a timing mark attached to the printing paper and outputs a mark signal, and the printing paper. an operation display device having a tape reader for setting the vertical dimensions and the start number of the serial number and reading data of the input program tape, and fixedly disposed on one side of the conveying path of the printing paper. an ink ribbon supply for supplying an ink ribbon between the type plate and the printing paper; a hammer device disposed corresponding to the position of the type plate on the other side of the conveying path of the printing paper; a print control circuit for inputting the pulse signal and the mark signal, calculating each check digit of the serial number based on data from the operation display device, and controlling the hammer device and the ink ribbon supply device; A printing device for serial numbers with check digits, characterized in that the check digit of the serial number can be printed in the check digit field of the printing paper at a timing corresponding to the detection of the mark.