TW527288B - Dot impact printer - Google Patents

Abstract

This invention provides a dot impact printer in which mutually contradictory print quality and print speed are enhanced, and unevenness of print density can be prevented without sacrifice of durability of various components. The dot impact printer performs printing by traveling an ink ribbon 1 in a direction S orthogonal to the carrying direction F of a print sheet 4 and reciprocating a print unit 2 mounting a print head for impacting the ink ribbon 1 against the print sheet 4 along the traveling direction S of the ink ribbon 1. With regard to forward print where printing is performed while moving the print unit 2 in the same direction Fw as the traveling direction S of the ink ribbon 1 and reverse print where printing is performed while moving the print unit 2 in the direction Rv reverse to the traveling direction S of the ink ribbon 1, traveling speed of the ink ribbon 1 at the time of reverse print is set higher than that at the time of forward print.

Description

27288 V. Description of the invention (1) "Technical scope" The present invention relates to a printing device of the type that the point-sensitive character unit moves along the ribbon, which is used to print the "technical background" on the surface and to print on the surface. By. On the printing device of the life treasure m 'using the click-type character of the ribbon, in addition to borrowing one word: [individual printing method of the person, there is also mm ... along with the printing head of Baijing Jiangxi number and printing paper The moving direction is orthogonal, and the long-shaped printing unit of the device is arranged, and the characters of one line are sorted and printed at a speed, which is the so-called line printing method. Putting the printing on the printing method of the order printing method to make the ribbon move in a direction orthogonal to the moving direction of the printing paper and in the other direction, and at the same time make the P-shaped early-and-reverse movement along the moving direction, And _ face for printing. In the printing device with the above-mentioned line printing method, it is necessary to speed up the printing speed without degrading the printing quality, and to look at the relative relationship between the color T moving in a certain direction and the printing unit moving back and forth. , Then its important is how to control the moving speed of the ribbon. That is, the relative speed of the printing unit relative to the ribbon is the smaller the actual speed Vh of the printing unit. $ 'Will be as shown in Figures 5 and 6, because the printing head continuously hits the color The area and frequency of the same-belt of the belt increase, resulting in the phenomenon that the seal becomes thinner due to the drying up of the ink. Therefore, on the conventional printing device, as shown in the timing flow of FIG. 7 to FIG. 9, various methods are used to control the speed of color π. The actual speed of the printing unit shown in each figure is regarded as a positive value. For example, as shown in Figure 7, the movement of the ribbon is only performed during the reversing action of the printing unit, and the movement of the ribbon is stopped during the printing action. This paper size applies the Chinese National Standard (CNS) A4 specification ( 210 X 297 公 餐） Order # Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 ^ 27288

-Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, that is, there is a method to move the printing unit in the same direction as the ribbon moving direction. • When printing forward, there is a method to reverse the transfer. , Which is to control the relative speed of the ribbon relative to the printing unit to the actual speed of the printing unit. (Hereinafter, it is referred to as the first conventional example.) In addition, as shown in FIG. 8, when printing is performed forward, the moving speed of the ribbon is set to a speed that exceeds the actual speed of the printing unit by%. When reverse-printing characters, there is a method that converts the speed of the ribbon to a low speed so that the relative speed of the ribbon relative to the printing unit becomes larger than VH. (Hereinafter, it is referred to as the second conventional example.) Furthermore, as shown in FIG. 9, there is a method in which the speed of the ribbon movement during reverse transfer is lower than that during forward printing, and Delay the switching timing of the ribbon moving speed from reverse transfer to forward printing by a predetermined time. (Hereinafter referred to as the third conventional example.) However, in the above-mentioned second conventional example, as the printing speed becomes faster, the reversing operation time of the stamp unit is set to be very short, so the ribbon is made shorter. Cannot move fully within the next day. That is to say, even if the ribbon is borrowed, the next ㈣ action ', but the impact of the strike on the ribbon ^ printed on the ribbon is not sufficiently moved, such as the original impact of the impact on the ribbon In the downstream direction of the moving direction, the printing unit is repeatedly hit by the printing unit several times. Therefore, when the ribbon is moved from right to left, the printing density on the left becomes thinner. In addition, if the ribbon is moved from left to right, the density of the printing on the right is made thinner in contrast to the above. In the second conventional example, the printing unit moves back and forth.

The size of this paper is applicable to the national standard (CNS) A4 (21〇X 297g g Μ -------- order --------- line (please read the precautions on the back first) (Fill in this page) 527288 A7 Wise Man V. Invention Description (3) The actual speed VH is very fast, so the ribbon's moving speed must be relatively fast when printing forward. Therefore, the ribbon's moving mechanism, such as The guide rails, rollers, and other parts that come into contact with the ribbon will wear quickly, and not only retreating in this way will cause a new problem of shortening the life of the ribbon itself. In the third conventional example, it is relatively The relative speed of the ribbon in the printing unit is smaller than the actual speed, and the impact area on the same impact point where the ribbon is continuously hit by the print head is larger when printing forward than when reverse printing. Therefore, according to the moving direction of the printing unit when it moves back and forth, there will be a problem that the printing density is poor. "Abstract of the Invention"-a kind of tir 糸 who is conceived based on the above situation, and his task is to provide a type of printing. Device, which is used to improve the opposite printing speed and printing speed without Will damage the treasure 丨 # The unevenness of the print density. "Durability and can prevent the law. In order to solve the above-mentioned problems," the present invention refers to the following technical aspects, that is, according to the present invention, The moving direction of the printing paper is t color. 4 It is moved with the device. In order to move the above-mentioned ribbon leader along the moving direction of the above-mentioned ribbon _p = printing of paper: click-type printing clothes for printing, Special features :: Move back the above printing unit-facing the same color square as above. Moving at 2 and-printing on the side :: Same to it ... Word unit-_... The moving element of the band, the type of printing direction上 — · -------- up Loading -------- Order --------- ί Please read the notes on the back before filling in this page} 6 yz / zm A7 V. Description of the invention (4) f. In the reverse transfer printing method in which printing is performed on one side, the moving speed of the above-mentioned color of the reverse transfer printing is set to be faster than the moving speed during forward printing. —If you use such a point-and-click printing device, when you are printing forward • hunt the marks that the printing head hits the ribbon, tied to During reverse transfer, make a relatively full movement to the downstream side of the ribbon in the moving direction. That is, because the area and the number of consecutive blows of the same place of the printing II ㈣ ribbon are reduced, there will be no change in printing density due to dryness. The phenomenon of thinness can effectively prevent the non-uniformity of the stamps / degrees. Moreover, the moving speed of the ribbon is independent of the actual speed of the printing unit when it moves back and forth, it just makes the energy ratio of the reverse speed fc It is enough to switch when printing forward. Therefore, it is not necessary to increase the speed of the ribbon to a higher speed than the actual speed of the printing unit ', and to prevent the parts that come into contact with the ribbon and the wear and damage of the ribbon itself. , And the durability of various parts is not damaged, and the printing speed is increased ^ ------------- (Please read the precautions on the back before filling this page) ^ ¾ of intellectual property Printed by Bureau Consumers Cooperative

In addition, the moving direction of the printing paper and the moving direction of the ribbon are not limited to the state of Wang Ren, but may be orthogonal to each other within a certain allowable range. In addition, the direction of the reciprocating movement of the printing unit and the movement direction of the color f are not limited to a completely parallel state, and may be in a state of being approximately parallel to each other within a certain allowable range. According to an ideal embodiment, the relative speed of the printing unit with respect to the ink ribbon is set to a speed higher than the actual speed of the printing unit during the printing of the forward printing and the reverse printing. For example, it is more ideal that the above-mentioned printing unit is performing a periodic back-and-forth movement -line -ϋ n n

n n I

nn I This paper size is in accordance with China National Standard (CNS) A4 (210 x 297 public love) 7 In the state of invention (5), the above-mentioned ribbon is set to a stop state when printing forwards, and on the other hand, Set it to the moving state when reverse printing. That is, when the printing unit is moved back and forth periodically at a constant speed, when the relative speed of the ribbon with respect to the printing unit is set to a speed higher than the actual speed, the relevant ribbon is switched according to the following conditions: Just fine. In other words, the speed of the ribbon is set to 0 or more during reverse transfer, and the speed at the time of forward printing is set to or δ and 疋 is more than 2 times the actual speed of the printing unit. However, if the speed of the ink ribbon is set to be higher than the actual speed of the printing unit, a problem such as that described by Senko in the second conventional example arises. Here, the moving speed of the ribbon is set to 0 when printing forward, and the reverse speed is set to a speed lower than the actual speed of the printing unit and greater than 0, and It can effectively prevent the parts that come into contact with the ribbon and the ribbon itself from abrasion and damage. According to other ideal embodiments, the above-mentioned printing unit is a long-formed person whose "m is orthogonal to the axis direction of the material on the paper" is loaded with a plurality of the above-mentioned printing heads, and its long-side direction is Set the inclination angle θ of the job to slightly tilt the ribbon in the 带 direction, set the strike width along the short side of the printing unit to Lh ', and print to the above color each time you print forward When the interval of the hitting area of the above-mentioned printing unit is determined as Lf, the following relationship is established:

Lh / sin0 $ Lf If this formula is used, for example, the moving speed of the ribbon is printed forward 527288 A7 V. Description of the invention (6) When the word is set to 0, the printing unit caused by each forward printing The interval LF of the striking area is slightly shorter than the total length of the longitudinal direction of the striking area, and is set to a length h / sm0 or more directly in front of the moving direction of the ribbon. That is to say, in the forward printing and the reverse transfer characters immediately after it, even if there is a hitting area on the ribbon, the hitting area of the forward printing will not hit the color each time. Take it on the same place. With this, the area and number of hits at the same color can reduce a considerable amount, and can effectively prevent the printing density from thinning due to the dryness of the ribbon. Other features and advantages of the present invention will be made clearer with reference to the accompanying drawings and the following description of embodiments of the invention. "Simplified description of the drawing" Fig. 1 is a schematic diagram showing the important parts of the opening > Fig. 2 is a schematic diagram showing the relative positional relationship between the ribbon and the printing unit. Figure 3 is a flowchart showing the timing of the printing operation. Fig. 4 is an explanatory diagram showing the state of the blow caused by the printing unit to the ribbon each time forward printing is performed. (F) The figure is an explanatory diagram showing the impact result of the relative speed with respect to the printing unit. Fig. 6 is an explanatory diagram showing the result of the impact with respect to the relative speed of the printing unit. Fig. 7 is a diagram showing a timing flow when performing a printing operation according to the conventional example. · This paper size is applicable to the national standard (CjsjS) A4 specification (2) 〇χ297 公 爱

527288 A7 B7 V. Description of the invention (Figure 7 of Figure 8 shows the timing when printing is performed by using the second known example. 0 Printing chart of the employee's consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs is showing using the third known example. "Flow of the Invention" during printing operation "Implementation Mode of the Invention" Hereinafter, the ideal embodiment of the present invention will be described with reference to the drawings. The first figure is a state of protection of the point-and-click printing device of the present invention. In addition, the present invention has the characteristics of controlling the speed of the ribbon. The basic structure is the same as the conventional one, so the part of the components is appropriately omitted. As shown in FIG. I, the printing on the printing device In the department, it has the following colors: endless ring-shaped colors, printing unit 2, printing platen roller 3, printing paper 4, driving motor 5 for ribbon movement, ribbon rewinding: counter roller 6, 6 'is a guide color ^ ribbon guide 7 along a predetermined path, a ribbon brake 8 for feeding the ribbon 1, a ribbon cassette 9, a moving mechanism 10, 10 for moving the paper 4 for brushes, and Printing unit & The moving edge sensor 11 etc. In addition, a microcomputer (not shown) is installed on the printing device, and the microcomputer is used to control various actions. The ribbon 1 is guided by the ribbon guide 7 The outside of the ribbon cassette 9 is used as a path, and is pulled to a certain degree of tension, and can be moved in a fixed direction. If the drive motor 5 rotates, it is reversed by a pushing mechanism (not shown). One of the roll-back wheels 6 rotates' and causes the ribbon i that is flared between the roll-wheels 6 ·, 6 to be stretched in the direction shown by the arrow s. This is the same as the printed brain 4—this paper scale applies to Zhongguan Home Standard_ (CNS) A4 Specification (21G X 297 Public Love " " 527288 V. Description of the Invention (8) The side of the ribbon brake 8 which clamps the opposite side of the ribbon cassette at the same time, is subject to a certain tension In this state, the ribbon is tightened. That is, the ribbon! The captive moves the side of the ribbon brake 8 as the upstream side, and moves the side of the rewind rollers 6, 6 as the downstream side. 'Make the part of the moving length caused by the movement, and store it in the ribbon cassette 9 by rewinding the rollers 6 and 6. Qiu ^ Yu ^ On the inside of the tape cassette 9, 'Ribbon 1 is in a bellows shape and has been folded into several screens. In addition, the ribbon W is arranged to be printed on the printing platen roller 3 in a printing unit described later. In the state of moving between the papers 4, the movement direction S of the pot is regarded as a direction orthogonal to the moving direction f of the printing paper 4 (from the right to the left in the figure). In addition, the movement of the ribbon i is It is controlled by the e microcomputer to control the drive motor 5. However, even if the ribbon is stopped during printing, it will not move in the same direction.

S moves in the opposite direction of S. Here's the ribbon! The moving direction is regarded as the positive direction. Printed by the Ministry of Economic Affairs 4th Consumer Property Cooperative of Hui Property Bureau

In this way, the ribbon 1 is made by dyeing a cloth woven with a high density with ink, and received by the fine needle of the printing unit 2. Thereby, the ink ribbon is made strong: the printing paper 4 is pushed, and the ink is transferred to the printing paper 4 for printing. Here, right in the ribbon! The same or two consecutive blows at the same place will not completely dry the ink in this part, and will have almost no effect on the printing density. However, if the number of continuous blows at the same place increases, the ink will dry out completely. The ink dry area 'reduces the print density on the printing paper 4 on the ink transfer side. Therefore, in this embodiment, the area and the number of times X! In the same place continuously hit by the printing unit 2 should be reduced, so as described below in the ribbon! The paper size of the control of the movement speed depends on the Chinese National Standard (CNS) A4 specification (Q x 297). 11 527288 A7 V. Description of the invention (9 Study. / The second picture shows the ribbon 1 and the printing sheet W A general diagram of the relative positional relationship of the printing unit. If it is described in accordance with this figure, the printing unit: it can be said that a keystroke t ~ 'is the side of the ribbon opposite the ribbon carrying the majority of the printing head 2a: and the square. The print heads are arranged at intervals along the longitudinal direction of the print head 2. On the Hg] print head 2 &, for example, "the branch," the field needle 2b ... is divided into 2 columns "and the two The rows are arranged in a tooth-like arrangement that deviates slightly from each other. These fine _ are used to directly strike the ribbon to enter the characters. In addition, the printing unit 2 is designed so that its length dimension can be equal to the visibility length of the printing paper 4, and The length direction is set to be slightly inclined around the moving direction S of the ribbon 1 at a predetermined inclination angle θ. In this way, the seal Zhanfan 2 is linked with a shuttle mechanism not shown in the figure, and along the length direction, that is, It is approximately horizontal with the moving direction s of the ribbon 1 for the period In this round-trip movement, the fine needle 2b of the print head ^ is shot to print the printing paper 4. Here, the print ^ 2 is moved at a speed in the moving direction s with the ribbon s The state of printing on the side in the same direction by private movement Φ is called "forward printing", while the printing unit 2 is at a certain speed in the direction opposite to the direction S of the ribbon i. RV: surface movement-surface printing This state is called "reverse transfer". In the present embodiment, each print 4 of the forward printing and reverse transfer is printed at a time with a frequency band. The so-called line is used. Those who print. The round-trip movement in Yinzi Zao 2 is based on the number of left and right edges of the edge sensor ^ and controlled by the microcomputer to control the shuttle mechanism. For example, the paper size ¥ China 527288 A7

^ 27288

Description of the invention (11) Control the moving speed of the ribbon 1 by month. vF < VR (VF = 0, ο < vR) Vr ^ Lh In addition, when printing forward and reverse printing, the relative speeds VsF and VsR of the ribbon of word unit 2 are established as follows: : About the relationship

V

V

SF == + VH— VF (= VH SR =-VH— VR Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs • VH ^ I + VH — VF I VH ^ I. vH-VR I Each relational expression is a timing program for the printing operation. As shown in the figure, in a state where the printing unit 2 is periodically moved back and forth at a certain speed, the moving speed of the ribbon 丨 enables = to print in the forward direction It is VF at the time, and Vr is converted on the reverse transfer character. Moreover, the reverse transfer character is converted from the forward printing or vice versa, when the printing unit 2 is reversed from the reverse transfer character to the forward printing. When printing forward and reverse transfer, the relative speeds VSF and VSR of the belt 1 with respect to the printing unit 2 are set so that their absolute values are set to the actual speed of the body of the printing unit 2. Vr is higher than Vh, so Vr is set to a speed greater than 0 'On the other hand, VF is set to a speed of 0 or 2 VH or higher. Here, the moving speed VF of the ribbon 1 is set to the actual speed of the printing unit 2 VH is more than 2 times, as described in the second conventional example, because Touch of the word -------- Order --------- {Please read the precautions on the back before filling this page) This paper size applies to China National Standard (CNS) A4 (210 X 297 (Mm) 14. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy as 527288 A7 __—__ B7______ V. Description of the invention (12) Roller 6 on the ribbon 1 and ribbon guide 7, ribbon brake 8, In addition, the ribbon 1 itself is prone to wear and damage, so the VF can be speed-controlled. That is, the speed of movement during printing forward makes the ribbon i stop. In addition, the moving speed VR at the time of reverse transfer is the same reason as described above, and is set lower than the actual speed VH of the printing unit 2. Moreover, Fig. 4 is an explanatory diagram showing the state of the blow caused by the printing unit 2 to the ribbon 1 each time printing is performed forward, and each time the printing is performed forward to the ribbon 1 The 'strike' is shown in the lower part of the figure by a hatching line, and the strike area can be indicated by 20. In addition, the inclination angle of the printing unit 2 relative to the moving direction S of the ribbon 1 is set to 0, and the strike width along the moving direction of the printing head 2a (the short side direction of the printing unit) is set to LH, and each time When the interval between the print heads 2 and the overall hit area 20 generated by the forward printing is set to LF, the following relationship can be established to make the ribbon! Just move it. ΐ ^^ / 〇ιπέ / ^ Li It is important to stop the ribbon 丨 (Vp = 0) every time printing is performed forward, and to make the ribbon 1 move at a constant speed Vr when reverse printing, then The moving speed VR of the ribbon 1 is controlled so that the interval Lf of the striking area 20 can be greater than LH / sin Θ. Here, the so-called "LH / Sin 0" is the length of the straight line S along the movement direction S of the ribbon, and is based on the continuous forward printing each time. This length is formed at an interval L4 of the hitting area 20. Even if the hitting area 20 is overlapped twice due to the forward printing and the subsequent reverse transfer characters, the forward printing is from the current time to the next time. It will not make 3 consecutive times until it is printed forward ------------- install -------- order --------- line (please read the first Note: Please fill in this page again.) 15 527288 A7 B7 V. Description of the invention (the strike area of 13 miles or more overlaps 20). Therefore, even if the ribbon is in the same place, it will be hit twice in the forward printing and reverse transfer characters. At the same time, there will not be three consecutive blows. In view of the above point, at the point of view of the moving speed VR of the ribbon during reverse transfer of characters, for example, the reverse operation time of the printing unit 2 is set to Out, and the reverse transfer time is determined by ', which can be expressed by the following relationship: LF (tH -f Tr) ^ lr Order here, the so-called forward printing time The reverse transfer time is about the same time from the state of the printing unit 2 moving back and forth at a fixed period, and from this relationship with the above, the original relationship vF < vR can be derived. YES 'In order to prevent the printing area 2 which is continuously hit once by the printing head 2a on the downstream side of the moving direction $ of the ribbon i, the color is accelerated during reverse transfer and the reverse operation of the printing unit 2. Take! The speed of movement, and 'print as far as possible' so that the above-mentioned amount of strike area 20 can be moved to the downstream side. The Ministry of Economic Affairs and Intellectual Property Bureau employee consumer cooperative printed 5th □ This is like this According to the printing device having the above structure and operation, the area and the number of times that the printing head 2a continuously strikes the same area of the ribbon i will be reduced, and the structure will not cause the ink of the ribbon 1 to be dry, so it can be maintained to: The state of the printing density and no unevenness 'has nothing to do with the moving party of the printing unit 2. The printing characters can be formed stably. The effect of this is shown by referring to Figures and Figure 6', compared to the printing unit 2. Ribbon The relative speeds vSF and vSR are set to be higher than the actual speed Vh of the printing unit 2 and can be easily understood from the viewpoint of reducing the area and the number of times that the continuous striking ribbon 丨 of the printing head 2a is the same. This paper size applies to China National Standard (CNS) A4 (215 " 297 mm) 16

Φ- ·-• Printed by the Consumers 'Cooperatives of the Intellectual Property Bureau of the Ministry of Green Economy' The present invention is not limited to those described above. _ • For example, the printing head 2a on the printing unit 2 is not limited to the above-mentioned conditions: the person's% has made the number of stitches to 12, and the number of stitches can be made more or less than this, And the arrangement of the needles or the device form of the printing head itself is not limited. In addition, the curve shown in Figure 4 is the minimum inclination angle 0 of the printing subunit 2 relative to the moving direction S of the ribbon 丨, which will minimize the hitting area 20 not overlapping each time printing is performed forward. The interval Lp is expressed in terms of actual size, but the curve is made different according to conditions such as the number of stitches and the printing density. Of course, those other than the conditions shown in the figure can also be applied to the present invention. 'In addition, design matters other than the features of the present invention described above are appropriate changes. For example, if the relative relationship between the movement direction 8 of the ribbon 1 and the movement direction of the printing sheet 7L 2 can be satisfied, the inclination angle of the printing unit 2 to the movement direction s of the ribbon 1 can be maintained in a state of approximately 0 degrees Yes. In addition, it is preferably applied to the line printing method, but in the inline printing method, the present invention can also be applied to a point-to-point printing device that prints one character at a time. "Effects of the Invention" As explained above, according to the present invention, since the area and number of times that the printing head continuously strikes the same ribbon is reduced, it will not cause the phenomenon that the printing density becomes thin due to dry ink, and can be effective. Prevent uneven printing density. In addition, it can prevent the parts that come into contact with the ribbon and the ribbon itself from being worn and damaged, and can speed up the printing speed without destroying the durability of various parts. Dimensions of this paper: Chinese National Standard (CNS) A4 (210 X 297 public love) 17 ^ -------- Order --------- ^ ί Jing first read the precautions on the back before filling This page} 527288 A7 _B7_ V. Description of the invention (15) Component number comparison 1 ... Ribbon 2 ... Printing unit 2a ... Printing head 3 ... Printing platen roller 4 ... Printing paper 5 ... Drive motor 6 ... Reverse roller 7 ... Ribbon guide 8 ... Ribbon brake 9 ... Ribbon cassette 10 ... Moving mechanism 11 ... Edge sensor —.-------- # 装 -------- Order ------ --- (Please read the notes on the back before filling out this page) The paper size printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs applies to the Chinese National Standard (CNS) A4 (210 X 297 mm)

Claims (1)

The patent application for “Wai” means that, =, the tape is printed to the aforementioned two, and the person who prints and prints along the aforementioned ribbon Ximeng t, j | 子 早 疋 ^ to and from the surface is characterized by: —Face the direction of movement with the aforementioned ribbon = direction! Move forward and print forward while printing side = make the other printing unit move in the opposite direction to the moving word of the aforementioned ribbon = and move the opposite side of the printing while printing the reverse color of the reverse color The belt moving speed is set to be faster than the moving speed when printing forward. 2 · = Please use the oldest point-to-click printing device in the patent scope, where in the front = pre-printing and reverse-transferring printing, the relative speed of the earlier-mentioned rain ribbon is the printing unit. Speed above the actual speed. For example, please refer to the point-and-click printing device of item 1 or 2 of the patent scope, i, in the state where the aforementioned printing unit is moving back and forth; and the word order states that the ribbon is in a stopped state during forward printing, and It is moving during reverse transfer. Angle 4 · ^ Click-type printing device of the scope of the patent application, in which the U-shaped printing unit is formed with a long shape, which is mounted along a direction orthogonal to the moving direction of the front brush paper The above-mentioned P-head 15]% is not placed so that its long side direction is inclined slightly with a predetermined inclination Θ with respect to the moving direction of the aforementioned ribbon, and this paper size applies the Zhongguanjia Standard (CNS) A4 specification (210 X 297 (Mm) 19 527288 A8 B8 C8 D8 VI. The scope of the patent application sets the strike width along the short side of the aforementioned printing unit to LH. Each time forward printing, the striking area of the aforementioned printing unit used to print the aforementioned ribbon is printed. When the interval is set to lf; * then the following relationship can be established:% LH / sin 0 S LF 〇 ------------- 衣 -------- order · ( (Please read the notes on the back before filling out this page) Line_: Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 20