JPS584679Y2 - Dot printer dot needle drive power control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dot needle drive power supply control circuit for a dot printer that is applied to, for example, a cash register.

Conventionally, in this type of dot printer for cash registers, etc., if the dot magnet drive circuit is destroyed and the head moves while the dot magnet is energized, the ribbon and platen will be destroyed by the dot needle in the embossing state. It had the disadvantage of

In view of these points, the present invention provides a power supply control circuit that switches the power supply for embossing the dot needle in response to the energization command signal generated by the energization width control circuit in response to the character pulse. The dot needle drive power control circuit of the dot printer prevents the dot magnet from becoming energized and in a single state due to destruction of the dot magnet drive circuit at the moment of printing, and prevents damage to the dot needle, ribbon, platen, etc. This is what we offer.

Next, an embodiment of the present invention will be described with reference to the drawings regarding a cash register.

FIG. 1 shows the appearance of a cash register having a ticket issuing function.

This register is connected to the register main body 1 and the printer 2, and by operating multiple item keys 3 set for each product on the register main body 1, the product name, unit price, product classification number, etc. of the specified product can be displayed. It has the function of issuing a printed ticket from the outlet 4 of the printer 2 and at the same time displaying the total amount of the sold products on the display 5, and is also characterized by being able to process sales aggregation work at any time. .

Therefore, I will explain the system of the register.

FIG. 2 shows a block diagram of the system, and the overall configuration of the device is composed of a central processing unit 6, a storage device 11, and an input/output device 8.

The central processing unit (CPU) 6 has built-in arithmetic circuits, program counters, control circuits, instruction recorders, command registers, etc., and functions as a data processing circuit to perform various arithmetic processing based on input signals, the storage device 7, and input/output devices. It functions to control 8.

The storage device 7 has four functions of this cash register:
In other words, "registration", "inspection", "payment" and "setting"
9 read-only memories (ROM) 9 that generally store fixed data such as each work program, and variable data such as product name, unit price, product classification number, number of sales items, sales amount, and product classification. 12 random access memories that store sales points, aggregated amounts, etc.
(RAM) 10, connected to the central processing unit 6 through an address bus 1F and a data bus 12, and control signal lines 13 and 14 from the central processing unit 6.
is selectively inputted via the ROM selector 15 and RAM 16.

The input/output device 8 includes three output ports 17, 18i9,
It is provided with i input ports 20 buttons and a keyboard display circuit 21, and a control signal line 22 from the central processing unit 6 is inputted to each of them similarly to the storage device I.

The signal from the output port 11 is input to the drawer opening device 23 to control the opening operation of the drawer 24, and the signal from the output port 18 generates various timing clocks. It is connected to each constituent circuit or device and controls the timing of information exchange between the CPU 6 and each circuit or device. Furthermore, the signal from the output port 19 is input to the dot printer control circuit 26 to control the printing operation of the dot printer 27. It does the work that it does.

Note that a feed signal and a cut signal from the output port 17 are input to the control circuit 26 and the dot printer 27, respectively.

The input port 20 has the four functions described above, namely, "registration,""inspection,""payment," and "setting."
Control key 2 for switching between each work program
8 is input, and based on this key data, the program stored in the ROMB of the storage device 1 moves the entire device into each specified work mode, such as "registration".
It is set in "Settings" etc.

On the other hand, a keyboard 29 and a display 5 for displaying input/output data are connected to the keyboard display circuit 21, respectively.

Next, in FIG. 3, reference numerals 30 and 31 denote ticket paper and journal paper as printing paper, which are fed in parallel to the printing side at intervals of one character line by a paper feeding device 32 such as a ratchet mechanism, and the other side is pressed by a platen 33. The image is printed by the dot printer 27 while the image is being displayed.

This dot printer 21 has seven dot printers 3 each.
It has seven vertical dot needles 35 that stamp on the printing paper 30 and 31 when energized in step 4, and as shown in FIG. One character is formed, and 40 characters are printed in one line while being moved along the guide 37 to the right and left by the drive of the feed wire 36.

Further, 38 is a slit body, and six slits 39 are formed in this slit body 38 for each character in parallel to the left and right feeding directions of the head 271 of the dot printer 21.

A slit detector 40 provided integrally with the dot printer 21 slides on the slit 39 as the dot printer 21 moves, detects the right end or left end of each of the slits 39, and generates a detection signal.

Reference numerals 41 and 42 denote a right position detector and a left position detector, each of which is provided with, for example, a light emitting diode and a light receiving element. When the dot printer 27 is located at the right end button and the left end button, the light shielding plate 41. ．． 42. A detection signal is generated by being blocked by the light.

Next, the dot printer control circuit 26 will be explained with reference to FIG.

The detection signal from the slit detector 40 passes through a level conversion circuit 43 and is converted into a pulse signal by a pulse conversion circuit 44, from which the dot needle 35 is converted.
A character pulse is output for timing the stamping.

Note that the slit detector 40, level conversion circuit 43, and Hihalus conversion circuit 44 constitute a character pulse detection circuit 45.

This character pulse is converted into a pulse representing the character position by a hexadecimal counter 46.
The output of 6 passes through an inverter 47 and is counted in decimal form by a digital counter 48 serving as a first up/down counter. Each block is divided into 4 blocks with 10 characters as one block and the number of prints per line divided into 4 blocks. The digit counter 48 is converted into a pulse representing the position.
The output of is connected to a shift pulse input terminal of a 4-pit shift register 50 through an inverter 49.

The data of the block that is not to be printed out of the four blocks is input from the data processing circuit 51 to the parallel input of the 4-bit shift register 50, and the parallel output outputs a print control signal from the 4-bit output terminal.

Further, the character from the pulse conversion circuit 44 is
The pulse passes through the inverter 50 and is sent to the delay time generation circuit 53.
After a predetermined period of time has elapsed, the delayed pulse is converted into a delayed pulse, and this delayed pulse is given enough energization time to stamp the dot needle 35 to the energization width control circuit 54, and the output of this energization width control circuit 54 is the second pulse. The signal is input to a dot counter 55 as an up/down counter and counted in hexadecimal format, and together with the print control signal of the 4-bit shift register 50, forms a matching circuit 56.

Next, the detection signals from the right position detector 41 and the left position detector 42 are inputted to an up/down counter control circuit 59 through respective level conversion circuits 57 and 58. A down signal is generated.

This up or down signal is input to the digit counter 48 and the dot counter 55.

Next, reference numeral 60 denotes a buffer memory for temporarily storing the stored contents that become print data from the output port 19 by the data processing circuit 51, and the order in which the stored contents are read out in the backup memory 60 is determined by the output of the digit counter 48. and this buffer memory 6
The data that continues from 0 is the character generator 6.
At step 1, the output of the dot counter 55 converts the printing order of the character composition into right-hand or left-hand printing, and is converted into data for dot printing.

Further, the output of the minus number circuit 56 formed by the parallel output of the 4-bit shift register 50 and the output of the energization width control circuit 54 is connected to the character generator 61 through an inverter 62, and is connected to the character generator 61 through an inverter 62. Seven matching circuits 63 are formed with the data read out from the Yaractage Generator 61, and the output of each minus number circuit 63 is inputted to each dot magnet 34 through each dot magnet drive circuit 64, respectively. The dot needle 35 is made ready for stamping.

At the same time, the 4-pit shift register 50
The output of the minus number circuit 56 formed by the parallel output of the energization width control circuit 54 and the output of the energization width control circuit 54 is input to the energization control circuit 56 through the level conversion circuit 65 as an energization command signal, and is output as a dot only when the energization command is issued. Embossing drive power source 67 for the needle 35
is supplied to each dot magnet 34.

Note that the level conversion circuit 65 and the energization control circuit 66 constitute a power supply control circuit.

In addition, the detection signal from the light position detector 41 passes through the level conversion circuit 5 as a home position detection signal, and forms a coincidence circuit 69 with the output of an oscillator 68 that generates a paper feed clock. The output of this minus number circuit 69 forms a coincidence circuit 71 with the signal from the manual feed key for feeding paper at any time, and furthermore, the output of this minus number circuit 71 is connected to the output port of the data section side circuit 51. An OR circuit 72 is formed with the program feed signal from 17.

The output of this OR circuit 72 further forms an OR circuit 74 with the output signal of the timer 73 of the up/down signal from the up/down/counter control @Nr59, and the output signal of this OR circuit 74 is It is input to the device 32.

Incidentally, FIG. 5 shows a schematic diagram of this embodiment.

Next, the characteristic operation of this dot printer 27 will be explained.

When the head 27a of the dot printer 27 is positioned at the right end with respect to the print paper in which the ticket paper 30 and the journal paper 31 are arranged side by side, a detection signal from the light position detector 41 causes the digit counter 48 to count up, for example, and the dot counter 55 is counted down to reverse the reading order of the stored contents of the buffer memory 60, and at the same time, the character generator 61 reverses the marking order of the dot hands 35 in the character structure, and the seven dot hands 35 strike five times in the left direction. 40 characters are printed to the left while composing one character by engraving, and when one line of printing is completed and the head 27a is located at the left end, a detection signal is generated by the left position detector 42. For example, the digit counter 48 is counted down and the dot counter 55 is counted up to further reverse the reading order of the stored contents and the stamping order of the character structure, and print 40 characters in the right direction on the next line.

In this way, each time a detection signal is generated by the right position detector 41 or the left position detector 42, the digit counter 48 and the dot counter 55 are switched up and down, and printing is performed while the head 27a is moving in both directions. will be carried out.

The slit detector 40 also detects the right end of each slit 39 when the head 27a moves from right to left, and detects the left end of each slit 39 when the head 271 moves from left to right. In response to the pulse, the delay time oscillator circuit 53 generates a delay pulse after a predetermined period of time has elapsed, and the energization width control circuit 4 adjusts the time to be sufficient for striking the dot hand 35, and the time is adjusted based on data from the character generator 61. At the same time, each dot needle 35 for each dot magnet 34 is made ready for engraving via each dot magnet drive circuit 64, and at the same time, an engraving drive power source 67 is supplied to each dot magnet 34 by an energization control circuit 66 for each energization command signal.

In this way, by converting the detection pulse into a delay pulse and delaying the timing at which the dot needle 35 pops out, the printing position is adjusted to match the character positions printed in both the left and right directions. The dot magnet 34 is energized at the moment when

In addition, printing of 40 characters per line is divided into 4 blocks of 10 characters each, and the buffer memory 60 is used for 10 characters to print the same character on the same line twice on the ticket paper 30 and once on the journal paper 31. If you want the remaining block of the journal paper 31 to be blank, input the blank block to the parallel input of the 4-bit shift register 50. The pulse signal input to the 4-bit shift register 50 via the hexadecimal counter 46 and the decimal digital counter 48 is converted into a print control signal and issues a no-print command, so that only the block with the no-print command is not printed, and each Enables selective printing of blocks.

Furthermore, the output from the manual feed key 70 for paper feeding is transmitted to the light position detector 41.
A coincidence circuit 71 is formed by the detection signal of the home position by the output of the oscillator 68 and the output of the coincidence circuit 69. When the position is other than the home position, paper feeding will not be performed even if the manual feed key 70 is operated during ticket issuance.

According to the present invention, the power source for driving the dot needle is switched in response to the output of the energization width control circuit based on the output of the character pulse detection circuit, so that the power source for driving the dot needle is switched for each energization command signal. Since the dot magnet is energized only at the moment when the dot needle strikes, for example, if the dot magnet drive circuit is destroyed, the dot magnet will not be in the energized state 11, and the energization can be controlled. This prevents damage to the dot needle, ribbon, platen, etc. due to damage to the drive circuit.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a cash register according to an embodiment of the present invention, Fig. 2 is a block diagram of the above system, a third country is a control circuit diagram of the above dot printer, and Fig. 4 is a character structure formed by stamping with the above dot hands. FIG. 5 is a block diagram showing the dot needle drive power supply control circuit. 27...Dot printer, 35...Dot needle, 45...Character pulse detection circuit,
54... Energization width control circuit, 64... Dot magnet drive circuit, 65... Level conversion circuit constituting the power supply control circuit, 66... Power supply control. The energization control circuit that constitutes the circuit, 67...
Power source for driving the dot needle.

Claims (1)

[Scope of utility model registration request] A character pulse detection circuit that detects a character pulse that determines the timing of marking when m horizontal markings is performed in a dot printer that prints one character by printing im markings with n vertical dot needles, and this detection circuit. an energization width control circuit that receives the output of the dot needle and provides sufficient time for stamping the dot needle, and a dot magnet drive that responds to the output of the energization width control circuit to enable the dot needle corresponding to the printing to be stamped. A dot needle drive power source for a dot printer, comprising a circuit, an embossing drive power source for the dot needle, and a power supply control circuit that switches the embossing drive power source in response to the output of the energization width control circuit. control circuit.