JPS599065A - Dot matrix printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to impact printing, and more particularly to impact printing, which uses a dot pattern in a printing operation to record dots on a print medium to form characters, images, symbol lines, etc. Regarding the type line printer type printing machine.

[Background technique]

They can be of various types such as dot matrix printers, helical printers and band printers. A dot hewax matrix printer, an improvement on the bar hewax printer, consists of a rotating cylinder having multiple rows of single raised dot printing elements spirally formed around a peripheral surface. A plurality of printing hammers are provided having bar-shaped dog impact surfaces. Paper print media is continuously fed between the hammer and cylinder. To complete the print strip on the paper, the hammer is selectively activated to impact the dot print element against the ink ribbon and the paper when one of the dot elements is placed in the position to be printed. You can see the actuator that does this.

A band matrix printing machine has a single ifl' of raised dots distributed along the band-IJ belt that moves horizontally across the paper to be printed. Another type is a dot printing machine having protruding dots distributed in a plurality of rows on a drum rotating on one axis parallel to the line to be printed. In both cases, printing is accomplished by impacting the protruding dot printing elements with a printing hammer. This causes the protruding dot to impinge on the print ribbon facing the paper, and when the paper makes contact, ink or print dots are transferred to the dot's location.

One of the dot printing elements moving along the print line prints the pattern by impacting the hammer against the print belt or drum when the print dot is at the desired location. In this way, any desired pattern can be
It is formed by an array of dots printed along lines. Subsequent lines are printed by stepping the paper perpendicular to the print line.

One limitation to the speed of an impact printing machine, such as an impact line printer type printing machine, is the cycle time of the printing hammer and the maximum repetition rate of the pattern on the dot helix cylinder or hachelt, band or drum. It would be obvious that it would be beneficial if the throughput of the printing machine could be improved with a constant hammer repetition rate of 1.

[Summary of the invention]

The present invention provides improved printing throughput for all point addressable printing machines.
It uses a multiple dot pattern distributed over a band or drum.

In dot hexox matrix printing machines,
Different arrays of dots whose position and spacing can be varied are used to increase printing speed.

1.2 compared to using a single dot pattern
．． By using 1.2 dot pattern, 66
Savings in print speed and power consumption are realized. 1
．． 2.1.6 Using a dot pattern
This results in a speed improvement of 1°O for the pattern.

Belt, band, or drum line printers are provided with multiple dot patterns of predetermined distribution. More specifically, it is an array of dots that provides improved performance due to the fact that the timed dot pattern is determined by 'If' which analyzes its sequential frequency of occurrence. is rVE Ll-]σ. Dot patterns with high statistical probability are often used for belts, . . . dots or dots. for example,
Pattern 1 consists of dots in the upper position, pattern 2 consists of dots in the lower position, and pattern 3 consists of dots in the upper and lower positions. If it is discovered that pattern 1 occurs more frequently than the other two patterns in a particular application, pattern 1 will often appear in more places on the belt, band, or drum. Used and distributed.

The above example has 2 rows (n=2) with 6 possible patterns.
and one row (n=1) of patterns.

There are 2 −1 possible patterns in the general case involving any number of rows and columns. The particular patterns that are often used and distributed are determined by statistical analysis in whatever character set is used. Accordingly, it is a principal object of the present invention to provide a new and improved dot-seven-trick printing machine.

In accordance with the present invention, there is provided a printing machine/stem having a plurality of discrete dot pattern marking elements for forming a character set and having a device for distributing the marking elements on the printing machine according to a predetermined distribution arrangement. .

In accordance with the present invention, different dot arrays of varying position and spacing are used to increase printing speed, providing a matrix printing machine having a helical array of embossed patterns on a cylinder.

According to the invention, a specific pattern of embossed dots is used and distributed depending on the statistical analysis of what kind of letterform is used, using bands, belts or drums. A trisox printing machine is provided.

[Description of preferred embodiment]

Referring to FIG. 1, a rotating cylinder 10 of a dot-helix matrix printing machine is shown.

Ten rows of single raised dot printing elements are spirally formed around the peripheral surface of the cylinder.

A plurality of similar rows are oriented along the cylinder.

There is one line ff at the printing position of each character.

Printing with a bar-shaped impact surface...The mark 12 is a drag +-+
'4] For each row of t-elements, perform gradient J. Although not shown, a paper print medium is continuously fed vertically between a rotating cylinder and print strips. A magnetically actuated actuator selectively activates the smell, the air, and the air.
When one of the dot elements is in position to print so as to record a dot printed on the paper, the dot printing element is struck 71 by the ink ribbon and the paper.

Printing with the basic dot pattern shown in Figure 1...
The repetition rate of the dots was determined to be 1 ms, the vertical spacing between the dots was 0.0508 cm, and the cylinder was 50.8 on.
Assume that it is rotating with a surface modulus of /sec. 5×7
When printing a character, it takes 6 milliseconds to complete one horizontal row of dots, and it takes 42 milliseconds to print one character.

There are 5 bits per character and a spacing of v'i1 dots between characters. 5×7 characters 15f drawn in Figure 2
It takes 18 hammer strikes to print.

In accordance with the present invention, printing speed and power consumption are improved by arranging different tosoto patterns on a cylinder.

In one example, the dot elements are oriented in a 1.2.1.2 array. The vertical spacing between dots is 0.0508 cn. The repetition rate of No Nma is fixed at 1 millisecond, and the cylinder is i5.
Assuming that the dot rotates at a speed of 2.4 cm/sec, the dot pattern is arranged in such a way that the number does not need to be hit twice within 6 rows of dots (1 millisecond). Therefore 5
It takes 4 milliseconds to print a row of dots instead of 6 milliseconds for the pattern of FIG. Therefore, an increase in the printing speed for the 66th column is realized. Printing the letter E shown in FIG. 2 requires only 12, rather than 18, impacts. This yields a power saving of 63%σ).

Dora! ...The printing speed can be further improved by providing a different arrangement k of patterns. For example, in Figure 4,
,2.1, the filter pattern is shown.

Assuming the same constant parameters, the cylinder is 2032(-n
Assume that it is rolling [-] at a speed of 17 seconds. Therefore, it now takes only 6 milliseconds to print a 5-dot line, a 100% speed improvement. It takes only 10 hammer strokes to print the intersection rE shown in Figure 2.
Requires A. Other dot patterns/for different resolutions can achieve the same print speed improvements.

The pattern in relief need not be in the form of dots. These can be extended into a rod shape to further improve the quality of the print. The bar-shaped pattern shown in the 51st line 1 is the 6th
It can be used instead of the dot pattern shown in the figure.

The solid line print on the right can be achieved by overlapping dots or bars.

In another embodiment of the invention, a line printer belt is provided to provide improved print throughput for all point addressable line printers.
Many dot patterns are distributed on the hand or drum. With full reference to FIG. 6, a single dot can be detected at any one of the seven locations across the hammer 1'5, where the hammer 1 roller can collide with a single protruding tab ζ dot printing element 14. The structure of one of the /Narundo printing machines is shown. The dot printing elements are arranged along the belt 15 at intervals of eight printing positions (
Tr) so that two dots are not present in front of the printing hammer at the same time. The belt is moved horizontally across the paper print medium to be printed. Printing is accomplished by a wheel that strikes a protruding dot printing element against a printing ribbon supported by paper, and when the paper is in contact it transfers ink or a print driver at the location of the l-i dot. The pattern is selectively activated by a magnetic actuator such that one of the dot printing elements, which moves along or across the print line, is positioned opposite the print belt or drum whenever one of the dot printing elements is in the position where it is desired to print a dot. It is printed by pressing a hammer. (FP
The number of hammers used can be varied depending on the number of characters printed on a line and the spacing between dots. In this way,
The pattern at any given location g1 is formed by an array of dots printed along one line. Subsequent lines are printed by vertically stepping the paper perpendicular to the print line.

Referring to FIG. 7, a simple multiple dot belt pattern is shown for ITI=2, n=1. m is the number of rows and n is the number of columns in the dot pattern distributed around the belt. This pattern consists of a dot P1 at the upper position, a dot P2 at the lower position, and a dot P6 at both the upper and lower positions. FIG. 8 shows a pattern similar to FIG. 7 with shaded squares for illustrative purposes. Pl, P2 and P3 are self-aligned around the belt as shown.

When each character consists of dots printed on an MXN matrix '2' and the printing element consists of dots distributed on an mXn7 matrix, the printing time T for printing one line of a character is T'''SX(M /m)X(N/n)XTr+(M/m)
given by XTp.

where Tr=hammer repetition rate 'l''p=advance time of paper S=function factor S that varies depending on the initial position of the dot pattern relative to the information to be printed. 1 and multiple dot bands, S>1. This increases the initial position of the required dot pattern further away from the position to be printed.

In order to increase the printing throughput more than in the case of a single dot, it is desirable to make it smaller than Rinsha 1 of S/mn. If this ratio is less than 1, a multiple dot pattern has a clear advantage over a single dot pattern. Even if this ratio becomes less than 1, if the term M/n) Tp reduces the paper advance time so that the total time becomes shorter, the multiple dot pattern is It is more advantageous than The factor S will be reduced if the belt speed is high and the statistics for multiple dot turns indicate skew.

The gist of the present invention is a case where the statistics show skew, as will be described later.

Under the conditions of Tr:==1 mIJ sec and T p = 5 mIJ sec, single dot band and 6 dot pattern strikes m=2. Consider printing an alphanumeric character set such as an 8x7 matrix with n=1 band. A single dot band requires 56 milliseconds to print and 40 milliseconds to advance the paper, resulting in a total print time of 96 milliseconds.

Next, considering the case of multiple dots where m = 2 and n = 1, the average printing speed for all alphanumeric character sets is 43.42 /i milliseconds. This results in an average improvement of 54.7%. However, this print speed improvement requires an eight-fold increase in belt speed, but results in an overall reduction in the number of actual hammer strikes during a print job. Additionally, increasing belt speed further increases printing throughput. Importantly, even if the belt speed increases, the throughput does not increase in the case of a single dot.

The method described above extends the jet dot band (belt, drum) printing concept to multiple dot elements. However, below is a general description of methods that can be used to further increase overall printing throughput. This method involves the use of statistics regarding the desired print character set, the language to be printed and ultimately the type of print job.

Although this description is not complete, it does indicate the method that should be used when designing a multi-dot printing machine.

For m=2, n-1 as shown in FIGS. 7 and 8, the number of independent patterns in the multi-dot belt printer is six. Considering all the character sets mentioned above,
The number of times each pattern occurs is as follows.

P1=231 P2=13 4 P5=1 1 1 Therefore, when printing all alphanumeric sets in which each character has an equal probability of occurrence, the number of types P1 is equal to the number of types P
It is clear that more belts (bunds or drums) than 2 or P6 provide greater printing throughput. Such a pattern is Pl, P2, Pl, P
3 in FIG.

The string-like distribution contained in the set of characters (m =
2. Comparing a multi-dot printing machine with n=1 and a multi-dot belt printing machine that takes this fact into account, in the case of sequential printing operation, if the tapped characters are printed from the left to the right. The following printing speeds can be obtained.

(1) For a non-statistical belt in which six patterns P1, P2, P6 are periodically distributed around the belt: Average printing method II: 24424 mi! Printing method 5 degrees in the case of J seconds/character line depth: 34.125 milliJ seconds/in case of a statistical belt with a circularly distributed pattern of Pl, P2, Pl, P6 around the character line belt :4 The number of cycles at one pattern position depends on the length of the belt.

Average printing speed: 23.878 mIJ seconds/character line Worst case printing speed: 34.125 m! J seconds/character line Random printing, i.e. printing where a pattern is shocked when it reaches a suitable printing position (therefore there is no condition for it to be moved from left to right), the print speed is a non-statistical belt. Singing time: 21, 47 ms, worst case 33.75 ms Statistical belt: average 2111
4 Mi! J seconds, or 31.25 milliJ seconds in the worst case.

Further improvements are made possible by considering the fact that not all letters are used with equal probability in any language. The relative positions of all belt dot patterns (during or between any given dot pattern cycle) are relative to a given dot pattern that directly precedes or follows any song dot pattern. The statistical probability of occurrence (i.e. dependent probability) affects the overall printing speed. Finally the given type O
All statistical skew related to printing operations (e.g. in insurance work, IF+: blank work, payroll work, etc.)
It can be factored into the statistics of the pattern's distribution.

Referring to FIGS. 10-13, the pattern is shown as being distributed in horizontal rows around the belt.

In the case of horizontal distribution, the number of patterns is 2n-1. n =
2, the six patterns P shown in FIG.
1, P2 and Pro exist. However, since patterns P1 and P2 are redundant, only patterns 1) 1 and P3 need to be used, as shown in FIG. 111. FIG. 12 shows seven patterns P1 to P7 for n=3. In this case, patterns 1 and 4 and 6 are redundant, and patterns P1, P4, P5 and P7 are redundant, as in the case shown in FIG.
only is required.

It will be clear that the invention is not limited to the particular patterns shown and described. These patterns can be varied to meet the requirements of different printing applications.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the basic single dot pattern arranged in a helical array on the cylinder of a dot helix 7 trix printing machine. FIG. 2 is a schematic diagram showing the dot matrix array for the printed character E. FIG. 3 is a schematic diagram showing the 1,2.1.2 dot pattern arranged in a spiral array on the cylinder of FIG. FIG. 4 shows 1, 2.1.
FIG. 3 is a schematic diagram showing a 6-dot pattern. FIG. 5 is a schematic diagram showing the bar pattern arranged in a spiral array on the cylinder of FIG. FIG. 6 is a schematic diagram illustrating one configuration of a dot pattern on the belt of a band matrix printing machine. Figure 7 shows vertical multiple dots on a band matrix printing machine.
FIG. 2 is a schematic diagram showing one configuration of a pattern. FIG. 8 is a schematic diagram in square form of the six vertical dot patterns shown in the array of FIG. FIG. 9 is a schematic diagram illustrating the dot no. FIG. 3 is a schematic diagram showing a horizontal array of 6-dot Z-turns on the belt of the 101st single-digit matrix printing machine. FIG. 11 is a schematic diagram showing two horizontal parallel arrays of the dot pattern shown in FIG. FIG. 12 is a schematic diagram showing a seven dot pattern arranged horizontally on the belt of a belt matrix printing machine. FIG. 13 is a schematic diagram showing a horizontal array of four of the dot patterns shown in FIG. 12. 10... Rotating cylinder, 11... Dot printing element,
12... Printing hammer. Applicant Published by International Business Management Co., Ltd.
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Continuation of page 1 [phase] Inventor Han Chung Wang 106 Old Lyme Road, Chabatka, New York, United States of America

Claims (7)

[Claims] (1) Paper is fed along the direction of movement of the circumferential surface of the rotating body,
1. Press the paper against the protruding dot pattern on the circumferential surface of the rotating body using a printing hammer to form a matrix of dots. In a dot matrix printing machine that prints a single character consisting of a dot, the dot pattern is oblique as a whole with respect to the direction of movement of the circumferential surface, and is opposed to a part of the circumferential surface intersecting the direction of movement. , a printing hammer is provided so that the dots pass 1 m below it at different positions as the circumferential surface moves, and selective actuation of the hammer causes the printing hammer to move the paper at different positions along the hammer. A dot matrix printing machine characterized by pressing the dots onto the dots. (2) The diagonal dot pattern consists of one dot in each row of the dot matrix.
The dot matrix printing machine described in item 1). (3) The diagonal dot pattern is comprised of a plurality of groups that repeat in each of the columns of the dot matrix, and the rows of each group are comprised of a different number of dots.
) IJ rack type machine. (4) Paper is fed along the direction of movement of the circumferential surface of a rotating body, and a printing hammer presses the paper against a protruding dot pattern on the circumferential surface of the rotating body to print a matrix of dots. - In a matrix printing machine, the dot pattern forms a line as a whole along the direction of movement of the circumferential surface, and is opposed to a part of the circumferential surface along the direction of movement, A printing hammer is provided so that the dots pass one after another under the printing hammer, and selective operation of the printing hammer forces the paper against the dots at different positions on the paper along the marking. A dot matrix printing machine that features the following features: (5) The above dot pattern consists of one row of dots along the rows of the L dot matrix.
The dot/7-tricks printing machine described in section. (6) The dot matrix printing according to claim (4), wherein the dot pattern is made up of a plurality of groups that repeat in each of the plurality of columns of the dot matrix, and each column of the group consists of a different number of dots. Machine. (7) The dot pattern according to claim 4, wherein the dot pattern is made up of a plurality of groups that repeat for every plurality of columns of the dot matrix, and each group is made up of a plurality of columns and a different number of dots.・7 trix printing machine.