JPH0420392B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is capable of printing twice in response to the first hammer that pops out when printing near perforations with creases on continuous slips made of multiple parts (hereinafter referred to as copy paper). This paper relates to a printing method for line printers. [Prior Art] As shown in FIG. 7, a conventional line printer runs a character band 4 on which printed characters 2 and timing marks 3 are formed on the upper surface over a platen 1, and also runs a ribbon on the printed characters 2. 5 and the copy paper 6, and move the copy paper 6 perpendicularly to the character band 4 (in the direction of the arrow).
Furthermore, the hammer coils 8 provided in each of the many hammers 7 arranged so as to face the printed characters 2 of the character band 4 are driven, and when the desired printed characters 2 come to a predetermined position on the copy paper 6, the hammer coils 8 are driven. The coil 8 is driven to apply impact energy to the hammer 7 for printing. Reference numeral 9 indicates that a hole (not shown) of the copy paper 6 printed by the printing unit of the line printer engages with a tractor pin 9b driven in the direction of the arrow by the drive unit 9a, and sends out the copy paper 6 in the direction of the arrow. It's a tractor. In addition, character band 4
For example, 136 hammers 7 are arranged horizontally in a row. FIG. 8 is a circuit diagram of a data compare circuit of a conventional line printer, in which the character code of the print data is input to one input terminal of the exclusive OR gate 10, and the character code of the band P-ROM is input to the other input terminal. A code is input, and if these two codes match, an output "1" is output, which drives the hammer coil 8. The operating procedure of such a conventional line printer consists of data load, print, and paper feed routines, and the print routine is shown in FIG. That is, when the print routine starts, it is determined whether the data flag (data to be printed) is set (step 1), and if it is set, the data flag (data to be printed) is passed through the data compare subroutine (step 2) and then the hammer drive subroutine (step 3). Execute. Next, the printed data flag is erased (step 4), and the process returns to step 1 to repeat the same process. If the data flag is not set, the printing routine ends (step 5). [Problems to be Solved by the Invention] However, as shown in FIG. 10a, for example, when the first hammer 7
In the state before impact, there are gaps between each sheet of copy paper 6 and between the paper and character band 4 via ribbon 5. Therefore, the impact energy of the hammer 7 that first flew out is consumed by the air space between them, resulting in no printing or very thin printing (lower printing clarity), making it difficult to read the printing. Can not. It should be noted that the printing by the second or later hammer 7 that pops out near the perforation 6a of six sheets of copy paper 6 having the same perforation 6a is normal (see FIG. 10b). For example, 1
When printing “F” from 1st to 10th digit on a line should be printed as shown in Figure 11, but if printed from the state shown in Figure 11, the first impact will be from the 7th digit. Table 1 shows examples of experimental results regarding the number of copy sheets 6 and the printing state of the first impact near the perforation 6a.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention arranges a ribbon on the upper surface of the printed characters of a character band provided with a large number of moving printed characters, and feeds the copy paper perpendicularly to the band on the upper surface of the ribbon. In a line printer that prints desired type on the paper by driving one or more of a number of hammers, a perforation with a crease is provided below the number of hammers. and a signal generating means for detecting the vicinity of the perforation by the detection means and printing only the first print of each line twice in a plurality of lines on the paper before and after the perforation. [Function] According to the present invention, in a continuous paper made of multiple parts, it is now possible to print even on the paper near the perforations, thereby improving the utility value of the copy paper. [Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6. Note that the same parts as those in the conventional example are given the same reference numerals, and the explanation thereof will be omitted. FIG. 1 is a schematic diagram showing the main parts of a line printer according to an embodiment of the present invention, and the difference from the schematic diagram of the conventional example shown in FIG. The light receiving element (phototransistor) 11b and the case 11
A long focal length photointerrupter (hereinafter referred to as detection means) 11 housed in c is provided below a large number of hammers 7, and the detection means 11 detects the copy paper 6 near the perforations with creases. It's becoming like that. FIG. 2 is an explanatory diagram of detection of perforations 6a with folds in six sheets of copy paper 6. Figure 2a
is when the copy paper 6 is flat, and the detection means 11 receives light and generates an ON signal. Second
Figure b shows a state near the perforation 6a where there is a crease, and light cannot be received within a range of 0.2 inches from the perforation 6a, and an OFF signal is generated (OFF in the diagonally shaded area in the figure). FIG. 2c is an explanatory view when the perforation 6a in FIG. 2b is located on the opposite side, and the effect is that light cannot be received within a range of 0.2 inch from the perforation 6a, similar to FIG. 2b. FIG. 3 is an enlarged explanatory view of FIG. 2b, and the dimension 0.4 inch in the figure is the detection range (OFF
1 inch in the figure is an appropriate range of multiple lines in which only the first character to be printed is printed twice. Therefore, the detection means 11 may be disposed at an appropriate position 0.3 inches below the center line of the plurality of hammers 7 and facing the printing surface of the copy paper 6. FIG. 4 shows a timing chart of the detection means 11 and a line counter to be described later printed on the copy paper 6.
This is an explanatory diagram showing the relationship between each line before and after the perforation of the copy paper 6 based on the line counter for 6LPI (counter for printing 6 lines in 1 inch) and the line counter for 8LPI (counter for printing 8 lines in 1 inch). be. That is, from the falling signal from the H level to the L level among the photointerrupter signals from the detection means 11, 0.5 inch before and after the perforation 6a, that is, 1 inch from the falling signal, only the first print is printed twice. range. If the line counter described later is used for 6LPI, there will be 6 lines per inch, and if it is used for 8LPI, there will be 8 lines. Figure 5a shows a double print signal (hereinafter referred to as
FIG. 3 is a circuit diagram of a signal generating means for generating a signal (referred to as a DP signal). 12 is a multiplexer (MPX), and the perforation 6 of the copy paper 6 has a tendency to fold.
The range of 1 inch before and after a is 6 lines (6-1 in decimal system)
= 5) is input in advance (A ₁ terminal 1, B ₁ terminal 0, C ₁ terminal 1, D _{1 terminal}
terminal 0). Similarly, a binary code indicating that the range of 1 inch before and after the perforation 6a on the copy paper 6 has 8 lines (8-1=7 in decimal system)
Input 0111 (A ₂ terminal 1, B ₂ terminal 1, C ₂ terminal 1, D ₂ terminal 0). 13 is a changeover switch for 6LPI and 8LPI,
14 is a line counter, and 15 is a D flip-flop (hereinafter referred to as D-FF). 16 is a monostable multivibrator (hereinafter referred to as One
-Shot). Assume that the changeover switch 13 is now set to the 6LPI side. At the fall of the photointerrupter signal from the detection means 11, the D-FF 15 is set and generates the DP signal. One-Shot16 is triggered by the rising edge of the DP signal and generates a single pulse, which is sent to the multiplexer (MPX).
When the binary code 0101 stored in the A ₁ , B ₁ , C ₁ , and D ₁ terminals is input to the CK terminal of the line counter 12 and the LD terminal () of the line counter 14, the binary code 0101 is input to the terminals Q _A , Q _B ,
Binary code 0101 for Q _C and Q _D (Q _A terminal 1, Q _B terminal 0,
_QC terminal 1, _QD terminal 0) are set, and the line counter 14 is also loaded (written) at the same timing. (A terminal 1, B terminal 0, C terminal 1, D terminal 0) Then, the LINECK signal that is generated every time the line printer feeds one line of paper is DownMode.
(ie, a subtraction counter), the binary code 0101 of the line counter 14 is subtracted to 0100 (4 in decimal system). Every time the LINECK signal is generated, the subtraction is repeated and 0101 is loaded into the line counter 14, and then the LINECK signal on the sixth line is generated, the D-FF is reset, and the DP signal drops. Further, a similar explanation will be given for the case where the changeover switch 13 is set to the 8LPI side, but the explanation will be omitted. Further, FIG. 5b is a timing chart when the changeover switch 13 in FIG. 5a is turned on to the 6LPI side. Next, the operation of this embodiment will be explained with reference to the flowchart of the print routine shown in FIG. When the print routine is started, first, P, R, and C (print routine counters) (not shown) are cleared (step 10). Next, through steps 1, 2, and 3 of the conventional print routine shown in FIG. 9, P, R, C=P, R, C
Count +1 (step 11). Next, determine whether it is within the 1 inch range before and after perforation 6a.
If NO, erase the printed data flag (step 4) and return to step 1 to repeat the same process. If the detection signal from the detection means 11 is generated in step 12 for 1 inch before and after the perforation 6a, the print routine is entered and it is determined whether or not it is the first printing (step 13). If so, return to step 1 and print twice. If not, the process returns to step 1 via step 4. Then, repeat 6 times for 6LPI, and 8 times for 8LPI at perforation 6a.
Prints within a 1-inch area before and after. (See Figure 4 and Figures 5a and 5b) Furthermore, for printing that has passed within a 1-inch range before and after the perforation 6a, step 1, 2, 3, 11,
After repeating steps 12 and 4, the print routine ends (step 5). [Effects of the Invention] As is clear from the above description, the present invention includes perforation detection means and signal generation means for causing the detection means to print the first print near the perforation twice, This makes it possible to print near the perforations, which improves the value of printing on copy paper consisting of continuous slips and the like made up of multiple parts, and has the effect of being able to meet market demands.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the main parts of a line printer according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram for detecting copy paper. 3 is an enlarged explanatory view of FIG. 2b, and FIG. 4 is a timing chart of the detection means and before and after the perforation of the copy paper. An explanatory diagram showing the relationship between each row of
6 is a flowchart of a print routine, FIG. 7 is a schematic diagram of a conventional line printer, and FIG. 8 is a data compare diagram of FIG. 7. A circuit diagram of the circuit, Fig. 9 is a flowchart of the print routine of Fig. 7, Fig. 10 is an explanatory diagram of perforations with creases, and Fig. a shows the state before the first hammer impact. Figure b is an explanatory diagram showing the state in which the second and subsequent hammers have made an impact, and Figure 11 is an explanatory diagram showing the relationship between the hammers of the line printer and the character band. In the figure, 2...printed letters, 11...detection means,
{4... Character band, 12... Multiplexer, 5... Ribbon, 13... Changeover switch, 6
...Copy paper, 14...Line counter, 6a
...perforation, 15...D-FF, 7...hammer, 16...monostable multivibrator} Double print signal generating means.

Claims (1)

[Scope of Claims] 1. A ribbon is arranged on the upper surface of a character band having a large number of traveling type characters, and a paper consisting of a plurality of sheets is fed perpendicularly to the band on the upper surface of the ribbon. In a line printer that prints desired type that has traveled to a predetermined position on the paper by driving one or more of a number of hammers, detection of perforations with creases provided below the number of hammers. A printing method for a line printer, comprising: means for detecting the vicinity of a perforation by the detection means, and signal generation means for printing only the first print of each line twice in a range of multiple lines of paper before and after the perforation.