JP2000185394A - Printing method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the peeling of paint less prone to generate, to enable sharp printing and to save the paint. SOLUTION: Paint is ejected intermittently from a printing nozzle 5 between points 1-2 and dots due to the paint are continuously formed to form a line A. Next, the paint is intermittently ejected from the printing nozzle 5 between points 3-5 to form dots continuously excepting a part. That is, lap printing at an overlap position (point 4) is prohibited so as not to apply the paint doubly with respect to the already formed line A. By this method, a line B is formed. Next, the paint is intermittently ejected from the printing nozzle 5 between points 6-8 to continuously form dots excepting a part. That is, lap printing at an overlap position (point 7) is prohibited so as not to apply the paint doubly with respect to the already formed line a. By this method, a line C is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing method and a printing apparatus for printing on, for example, a hot steel material.

[0002]

2. Description of the Related Art Conventionally, when a product number is written on a hot steel material, a printing nozzle capable of discharging paint is used, the printing nozzle is operated in accordance with the character shape, and the tip of the printing nozzle is operated. , And printing was performed on the surface of the hot steel material by discharging the paint.

In this case, the timing of discharging the paint from the printing nozzle is determined when the character shape and the operation locus of the printing nozzle coincide with each other, and printing is performed by discharging the paint at the coincident timing.

[0004]

However, depending on the character shape, there is a portion where overwriting is performed (for example, a portion where vertical and horizontal character paths intersect), so that the above method may cause a problem. Was.

[0005] Specifically, when overwriting is performed, the paint becomes thicker in that portion. For example, when printing on a hot steel material with paint, the paint is peeled off at the overwritten portion due to shrinkage during cooling of the steel material. May occur. As a result, there is a problem that the characters become unclear and cannot be read.

As this paint, a corrosive paint is used in order to roughen the surface of the steel material to enhance the adhesion of the paint. Particularly, when the print target has corrosion resistance such as SUS steel, the like. However, since the adhesiveness of the paint is weak, the paint tends to peel off due to shrinkage during cooling of the steel material, which has been a serious problem.

[0007] Apart from this, depending on the character shape,
Paint may adhere excessively. For example, in a section where the scanning speed of the printing nozzle is slow (for example, a section where a character path is curved), if the paint is ejected at the same timing as a section where the scanning speed is fast (for example, a section of a straight line of a character path), the paint becomes excessive. Will stick.

[0008] Therefore, in addition to the problem of peeling of the paint, the consumption of the paint increases, and further, if the paint drips during printing, the characters become unclear and the character cannot be read. There was a problem of becoming. The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a printing method and a printing apparatus in which paint is hardly peeled off, clear printing is possible, and the paint can be saved. .

[0009]

Means for Solving the Problems and Effects of the Invention (1)
The invention according to claim 1 for achieving the above object is a printing method for performing printing by discharging a paint from a printing nozzle onto a printing target, wherein the path of the characters to be printed has an overlapping path. The gist of the present invention is a printing method characterized in that overpainting of the paint at a position where the paint occurs is inhibited or suppressed.

According to the present invention, for example, when printing is performed on the surface of a hot steel material with paint, at the position where character paths overlap (intersecting portions), the repainting of paint is prohibited or suppressed. Therefore, unlike the related art, excessive paint does not adhere to the position where the character paths overlap, so that the paint does not peel off, for example, when the hot steel material contracts due to cooling. Therefore, the printed characters are always clear and can be easily read. In addition, since unnecessary paint is not applied, paint can be saved.

The term "suppression" refers to, for example, reducing the amount of coating more than usual. Although the effect of preventing peeling is lower than in the case of "prohibition", a certain effect can be obtained (the same applies hereinafter). (2) The invention according to claim 2 is characterized in that when the paint is intermittently ejected from the printing nozzle and printing is performed using the dots of the paint, the overprinting of the dots is prohibited or suppressed. A gist of the printing method according to the first aspect is provided.

The present invention specifically exemplifies a printing method. Here, when forming a character, the paint is intermittently discharged to form a line or the like by dots of the paint. Therefore, by prohibiting or suppressing the dot overprinting at the position where the character paths overlap, it is possible to prevent the character from being separated and to save the paint, as in the case of the first aspect.

(3) The invention according to claim 3 is a printing method for intermittently discharging paint from the printing nozzle and performing printing with dots of the paint, wherein the printing is performed in the path of the characters to be printed. The gist of the invention is a printing method characterized in that in the section where the dot overprinting occurs, the dot overprinting is prohibited or suppressed.

According to the present invention, in a section of a character path to be printed where dot overprinting occurs, dot overprinting is prohibited or suppressed. For this reason, for example, the interval between dots is narrowed due to the shape of a character or the like (for example, a portion where the character path is sharply bent), and the dot overprinting is prohibited in a section where the paint is repeatedly applied. Thereby, similarly to the first aspect, the peeling of characters can be prevented, and the paint can be saved.

(4) The printing method according to claim 3, wherein the section in which the dot overprinting occurs is a section in which the moving speed of the printing nozzle is slow. The method is summarized. The present invention exemplifies a section in which dot overprinting occurs.

Specifically, in a section in which the moving speed of the printing nozzle is slow, the interval between the centers of the dots becomes narrow, and the paint of the adjacent dots overlaps. Therefore, in such a case, prohibition or suppression of dot overprinting is performed. (5) The invention according to claim 5, wherein the printing target is a steel material of general steel or SUS steel.
The gist is the printing method according to any one of (4) and (4).

The present invention exemplifies an object to be printed. Here, general steel or SUS steel is shown. In particular, SUS
In the case of steel, for example, even when a paint (corrosive paint) that roughens the surface of a steel material to increase the adhesion is used, sufficient adhesion cannot be obtained. By performing the prohibition or the suppression of the above), the effect of preventing the peeling of the paint is great.

This will be described with reference to FIG. An example
For example, for general steel, the corrosive paint (for example, 2Al +
6H_ThreePO_Four+ SiO _Two) Is applied to the surface of general steel
The surface of general steel is
Corroded and roughened, thereby strengthening the pigment component of the paint
Adheres to

On the other hand, when a similar corrosive paint is applied to the SUS steel, the oxide film on the surface of the SUS steel is hardly reduced, so that the surface of the SUS steel is hardly corroded and hardly roughened. For this reason, the pigment component of the paint does not adhere so strongly, so that peeling is likely to occur.

Therefore, in the case of SUS steel in particular, by prohibiting or suppressing the above-mentioned overpainting (or overstrike) of the paint, a great effect of preventing the peeling of the paint can be obtained. (6) The invention according to claim 6 is the gist of the printing method according to claim 5, wherein the steel material is a hot steel material or a cold steel material.

The present invention exemplifies the types of steel materials, and here includes hot steel materials or cold steel materials. In particular, when printing is performed on a steel material having a high temperature with a paint, the paint is easily peeled when the steel material contracts when the steel material is cooled. Therefore, for example, by prohibiting or suppressing the above-mentioned overpainting (or overstrike) of the paint on a hot steel material, a great effect of preventing the paint from peeling can be obtained.

This will be described with reference to FIG. For example, when the paint is thinly applied to the hot steel material of the SUS steel, even when the hot steel material shrinks during cooling,
Dry paint (solid pigment) is easy to follow the change in dimensions, so that peeling of paint (pigment) is small.

On the other hand, when the paint is thickly applied to the SUS steel hot steel material, when the hot steel material shrinks during cooling, the pigment does not easily follow the dimensional change. Peeling off often occurs. For example, by prohibiting or suppressing the above-described overpainting (or overstrike) of the paint on a printing target having a large temperature change such as a hot steel material, a great effect of preventing the paint from peeling can be obtained.

Since the corrosive paint hardly adheres to SUS steel, for example, the above-mentioned overpainting (or overstrike) of the paint is prohibited or suppressed, for example, with respect to a hot steel material of SUS steel. The effect of preventing large paint peeling can be obtained. Here, the definition of a hot steel material and a cold steel material is shown.

Hot steel is a steel that is at or above the recrystallization temperature. -Cold steel is steel that is at or below the recrystallization temperature. (7) The printing method according to any one of (1) to (6), wherein the paint is a paint that is roughened by corrosion and adheres to the surface of the print target. Is the gist.

The present invention exemplifies a paint used for printing. Here, for example, a coating material is used which is roughened by corrosion and adheres to the surface of a steel material to be printed. When this paint is used, for example, in general steel, the surface is suitably roughened and the paint (and thus the pigment) adheres firmly. For example, when the general steel is a hot steel, it shrinks when cooled, This is preferable because peeling hardly occurs.

(8) The invention of claim 8 is a printing nozzle for discharging paint, moving means for moving the printing nozzle in order to print characters on a printing target with the paint, and the printing nozzle. Control means for controlling the timing of discharging paint from the, when printing the characters,
A gist of the printing apparatus is characterized in that overpainting at a position where an overlap occurs in the character path is prohibited or suppressed.

[0028] The printing apparatus of the present invention includes
When the printing nozzle is moved along the path of the character, and the control means discharges the paint from the nozzle for printing along the path of the character, the coating is prohibited or suppressed at the position where the overlapping occurs in the path of the character. . As a result, similar to the first aspect, it is possible to prevent the peeling of the characters and save the paint.

(9) A ninth aspect of the present invention is a printing nozzle for discharging paint, moving means for moving the printing nozzle in order to print a character on a print target with the paint, and Control means for controlling the timing of intermittently discharging the paint from the printing nozzles in order to form the paint dots, in the section where the dots are overprinted in the path of the characters to be printed. ,
The gist of the present invention is a printing apparatus characterized in that the dot overprinting is prohibited or suppressed.

[0030] The printing apparatus of the present invention includes
When the printing nozzle is moved along the character path, and the control means intermittently discharges the paint from the printing nozzle in the character path, in a section where dot overprinting occurs in the character path, Prohibition or suppression of dot overprinting.

As a result, in the same manner as in the third aspect, the peeling of the characters can be prevented, and the paint can be saved. In the present invention described above, characters include not only characters such as hiragana, katakana, kanji, and English, but also various numbers and symbols such as +,-, and #.

Therefore, printing means that a material including the above-mentioned characters or the like is formed by coating (for example, a chain of paint dots).

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (embodiment) of a printing method and a printing apparatus according to the present invention will be described below with reference to the drawings. (Example 1) a) First, a printing device used for a printing method will be described.

FIG. 2 shows the printing apparatus viewed from the end face of the steel material, and FIG. 3 shows the printing apparatus viewed from the side of the steel material. As shown in FIGS. 2 and 3, the printing apparatus according to the present embodiment intermittently sprays a paint on an end face 3 a of a hot steel material 3 made of, for example, SUS steel, which is conveyed on a transfer 1, and The character is printed by the dot (dot).

As the paint, a paint which corrodes and roughens the surface of the hot steel material 3 to increase the adhesion, for example, “2Al +
6H ₃ PO ₄ + can be used SiO ₂ ". The printing apparatus includes a printing nozzle 5 for discharging fuel, an XY stage 7 for moving the printing nozzle 5 in the XY direction (plane direction) according to the character shape, and a hot steel material 3 for the XY stage 7.
A moving mechanism (not shown) for moving toward the end face 3a (Z direction), a controller 9 for controlling the movement of the printing nozzle 5 and controlling the timing of discharging the paint, and a personal computer for outputting a command signal to the controller 9 11 is provided.

As shown in FIG. 3, an air pipe 13 and a paint pipe 15 for supplying paint are connected to the print nozzle 5 through an XY stage 7, and the supply of air to the print nozzle 5 The paint is sprayed in the form of a mist from the discharge port 5a at the tip (so-called air atomization).

B) Next, a printing method using the printing apparatus will be described. Here, as shown in FIG.
The case of printing the character "" will be described as an example. FIG.
As shown in (a), the characters "K" correspond to points 1 to 3 in FIG.
Three lines connecting lines 2, 3, 5, and 6 to 8 (line A, line B,
Line C). In this case, line A and line B intersect at point 4 and line A and line C intersect at point 7.

Accordingly, when the paint is discharged intermittently by the printing nozzle 5 and a line is drawn by connecting the dots (dots) of the paint, the printing is repeated at the positions of points 4 and 7. Will do. Therefore, in the present embodiment, FIG.
As shown in (2), control is performed so that dots are not overprinted at the positions of points 4 and 7, that is, the overprint is prohibited.
Hereinafter, the procedure will be described.

First, as shown in FIG.
During this period, the paint is intermittently ejected from the printing nozzle 5 to continuously form dots (dots). Thereby, a pseudo line A by stippling is formed in the path of points 1 and 2. In this case, a signal for driving the print nozzle 5 is output from the controller 9 as shown in FIG. That is, an ON signal (ON) for discharging the paint.
Is output for 30 msec, and thereafter, an OFF signal (OFF) for inhibiting the discharge of the paint is output for 20 msec (that is, no ON signal is output). Then, the operation is repeated for the number of dots required for forming the line A. In this case, for example, 100 to 200 dots can be ejected per second. However, in FIG. 4C, for the sake of explanation, the number of ON / OFF operations is smaller than the actual number of dots. .

Next, as shown in FIG.
During this period, the paint is intermittently ejected from the printing nozzles 5 to form the paint dots continuously except for some of them.
That is, overlapping of the dots at the overlapping position (point 4) is prohibited so that the paint is not applied twice to the already formed line A. As a result, a pseudo line B is formed in the path of points 3 to 5.

In this case, from the controller 9, FIG.
As shown in (c), at timings corresponding to points 3 to 5,
A signal for driving the printing nozzle 5 is output. That is, the on signal (ON) at point 4 is not output, and
Overstrike at point 4 is prohibited. FIG. 4 (c)
, The OFF section from point 2 to point 3 is a section in which the printing nozzle 5 moves to form the next line B.

Next, as shown in FIG.
During this period, the paint is intermittently ejected from the printing nozzles 5 to form the paint dots continuously except for some of them.
That is, overlapping of dots at overlapping positions (point 7) is prohibited so that the paint is not applied twice to the already formed line B. As a result, a pseudo line C is formed in the path of points 6 to 8.

In this case, from the controller 9, FIG.
As shown in (c), at timings corresponding to points 6 to 8,
A signal for driving the printing nozzle 5 is output. That is, the ON signal (ON) at point 7 is not output, and
Overstrike at point 7 is prohibited. FIG. 4 (c)
, The OFF section from the point 5 to the point 6 is a section for the printing nozzle 5 to move to form the next line C.

As described above, in the present embodiment, when the paint is intermittently discharged from the printing nozzle 5 to the hot steel material 3 of SUS steel to print characters by dots, the character path is changed. Overprinting of dots at overlapping portions (intersecting portions) is prohibited. As a result, the paint in the overlapping portion of the character path becomes thinner, so that the hot steel 3
In the case where a corrosive paint having low adhesiveness to the hot steel material 3 is used, even when the hot steel material 3 contracts upon cooling, the peeling of the paint (accordingly, a solid pigment) can be suppressed. Therefore, the printed characters are always clear and can be easily read. In addition, there is an advantage that paint can be saved and cost can be reduced. (Embodiment 2) Next, Embodiment 2 will be described, but description of the same parts as in Embodiment 1 will be omitted.

In this embodiment, the scanning speed (moving speed) of the printing nozzle 5 is slowed down instead of prohibiting the overprinting at the intersection of the character paths as in the first embodiment. This is to prohibit dot overprinting in a section where dot overprinting occurs.

For example, as shown in FIG. 5, when printing the numeral "5", the scanning speed is usually high in the linear portion,
Although dot overprinting does not occur, the scanning speed is reduced due to the characteristics of the XY stage 7 at the curved portion, and dot overprinting occurs partially. Therefore, in the present embodiment, dot overprinting is prohibited in such a section where the scanning speed is low (for example, a curved portion, a portion bent at a right angle or an acute angle).

Specifically, it is possible to adopt a method in which the frequency of the output of the ON signal at the time of printing is made lower (for example, every other) in the curved portion than in the straight portion. This allows
In the section where the scanning speed of the printing nozzle 5 is low, the peeling of the paint (therefore, solid pigment) can be suppressed. Therefore, the printed characters are always clear and can be easily read. In addition, paint can be saved, which contributes to cost reduction.

It should be noted that the present invention is not limited to the above-described embodiment at all, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. (1) For example, in the above-described embodiment, characters are formed by dots, but characters may be formed by continuously spraying paint. In this case, adjustment is made so that the paint ejection state is reduced (for example, to 0) so that the paint is not applied repeatedly at the intersections of the character paths. In a section where the scanning speed is slow, for example, the discharge amount of the paint is limited (for example, on / off duty ratio control is performed) so that the paint does not become too large.

(2) In the above embodiment, the object to be printed is a hot steel material, but may be a cold steel material. Further, the application target is not a steel material, but may be, for example, an aluminum material.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the principle of the invention, (a) is an explanatory diagram showing the principle of paint adhesion, and (b) is an explanatory diagram showing the paint peeling phenomenon on SUS steel.

FIG. 2 is an explanatory diagram of the printing apparatus according to the first embodiment as viewed from an end surface of a steel material.

FIG. 3 is an explanatory diagram of the printing apparatus according to the first embodiment as viewed from a side surface of a steel material.

4A and 4B illustrate a printing method according to the first embodiment, where FIG. 4A is a diagram illustrating a character path, FIG. 4B is a diagram illustrating a character formed by dots, and FIG. FIG.

FIG. 5 is an explanatory diagram illustrating a printing method according to a second embodiment.

[Description of Signs] 3 ... Hot steel material 5 ... Printing nozzle 7 ... XY stage 9 ... Controller 11 ... PC

Continued on the front page F term (reference) 2C056 EA09 EA13 EA25 EC69 EC71 EC79 FB01 FC01 2C062 RA01

Claims (9)

[Claims] 1. A printing method for performing printing by discharging a coating material from a printing nozzle to a printing target, wherein the coating of the coating material at a position where the path overlaps in a path of the character to be printed is performed. A printing method characterized by being prohibited or suppressed. 2. The method according to claim 1, wherein when the printing nozzle is intermittently ejected from the printing nozzle and printing is performed by using dots of the coating, overlapping of the dots is prohibited or suppressed. The printing method described. 3. A printing method in which paint is intermittently ejected from said print nozzle and printing is performed using dots of the paint, wherein the dots are overprinted in a path of the character to be printed. A printing method characterized in that in a section, the dot overprinting is prohibited or suppressed. 4. The printing method according to claim 3, wherein the section in which the dot overprinting occurs is a section in which the moving speed of the printing nozzle is slow. 5. The printing method according to claim 1, wherein the printing target is a steel material of general steel or SUS steel. 6. The printing method according to claim 5, wherein the steel material is a hot steel material or a cold steel material. 7. The printing method according to claim 1, wherein the paint is a paint that is roughened by corrosion and adheres to the surface of the print target. 8. A printing nozzle for discharging paint, moving means for moving the printing nozzle for printing characters on a printing target with the paint, and controlling timing for discharging the paint from the printing nozzle. A printing device, comprising: a control unit configured to prohibit or suppress, at the time of printing of the character, a repetitive coating at a position where an overlap occurs in a path of the character. 9. A printing nozzle for discharging a paint, moving means for moving the printing nozzle for printing a character on a printing target with the paint, and forming a character by a dot of the paint. Control means for controlling the timing of intermittently discharging the paint from the printing nozzles. In the section of the character to be printed, in the section where the dot overprinting occurs, the dot overprinting is prohibited. Or a printing device characterized by suppressing.