JP3759510B2 - Building board printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a building board printing apparatus using inkjet printing technology, and more specifically, even if the building board cannot be cut accurately with respect to the position of the building board's pattern portion, The present invention relates to a building board printing apparatus for performing uniform ink jet printing.
[0002]
[Prior art]
In Japanese Patent Application Laid-Open No. 2004-133867, the applicant of the present invention is a building board for performing uniform inkjet printing on the handle portion of each building board even if the building board cannot be cut accurately with respect to the position of the handle portion of the building board. We have applied for an invention relating to inkjet control of a printing apparatus. The present invention relates to an invention for acquiring pattern portion contour information of a building board.
[0003]
In general, many ceramic building boards are composed of a substrate portion and a handle portion formed thereon. In addition, building boards with a four-way joint structure with a good construction appearance are often used. In the building board having the four-way joint structure, a lower solid part is formed on two adjacent sides, and an upper solid part is formed on the remaining two sides. When viewed from above, the lower solid portion protrudes beyond the handle contour.
[0004]
On the other hand, in the case of ceramic building boards, since there are many manufacturing processes, from the aspect of production efficiency, for example, a large board formed with patterns of four boards is formed first, and it is divided into four. A method of manufacturing four plates by dividing (cutting) is employed. And in construction where a large number of building boards are attached to the entire wall surface, the cutting accuracy of each board greatly affects the construction appearance. Therefore, it is necessary to pay sufficient attention to the management of cutting accuracy.
[0005]
However, there is a limit to the cutting accuracy of ceramic building boards, and it is difficult to manufacture a completely rectangular building board.
[0006]
FIG. 1 is a top view showing a building board having a four-way consensus structure. Here, the cutting error is drawn with emphasis. The main cutting lines are two sides of the side AB and the side BC in the handle part and the adjacent lower solid part protruding from the handle part outline (side CD and side DA). The embossing that forms the handle is relatively accurate and the corner point D is relatively accurately perpendicular, but the cutting accuracy of the building board is not so high, and the corner points A, B, C is difficult to make a right angle relatively accurately. The corner points A, B, and C are formed by cutting, while the corner point D is a corner point from before cutting.
[Patent Document 1]
Japanese Patent Application No. 2003-109659
[0007]
[Problems to be solved by the invention]
Now, when considering performing full color inkjet printing on the pattern part of a building board of this shape, when printing is performed while running the building board on the determined conveyance path, due to the cutting error of the building board, As the cutting position with respect to the handle is not uniform depending on each building board, the conventional building board printer using a fixed printing head that tries to print uniformly on the cutting line will It is very difficult to perform uniform printing.
[0008]
Therefore, as described in the previous proposal, in consideration of the cutting error of the building board, the pattern (and / or orientation) of the pattern portion with respect to the cutting line (for example, side AB) is detected to control the ejection of the inkjet. Wall construction where a large number of building boards are pasted by correcting the data and controlling inkjet ejection based on the corrected pattern data to perform uniform inkjet printing on the pattern part of each building board It is possible to ensure the uniformity of the entire wall pattern.
[0009]
In that case, for example, typically, the dimension a of the side AB, the dimension b of the side AD, and the angle θ between the side AB and the side AD (90 degrees—the angle formed by the side AB and the side AD, ie, Since the triangle ABD is uniquely determined by determining three values of the pattern portion direction deviation angle with respect to the cutting direction, the position of the corner point D that is relatively perpendicular to the side AB that is the cutting line is determined, The position of the handle portion with respect to the cutting line can be obtained.
[0010]
An object of this invention is to provide the building board printing apparatus which can obtain | require the pattern part position with respect to the cutting position of a building board in this way.
[0011]
[Means for Solving the Problems]
Building board printing apparatus of the present invention includes a conveying means for conveying the building board of the four-way Goke' structure, located above the conveying means, of the four corners point of the handle portion of the building board,該柄The corner point from before cutting the corner (this corner point is assumed to be point D) and the corner points at both ends of the pattern board cutting direction cutting line (of which the corner point close to point D is point A) Position detection means for detecting the relative positions of the three corner points in the two dimensions, and the corner points detected by the position detection means. An arithmetic unit that calculates an angle between the side AB and the side AD based on the position (this angle is referred to as an inner angle A), and rotation correction of the pattern data based on the inner angle A calculated by the arithmetic unit, Control means for controlling the injection .
[0012]
In addition, a linear ruler plate extending along the direction of conveying the building board of the conveying means, and a pusher that presses the building board in the width direction to abut against the ruler plate, The position of each corner point can be accurately detected by fixing the building board in the middle of the conveyance path.
[0013]
In addition, at least one of the position detection means includes a one-dimensional image sensor and a linear motion mechanism that moves the one-dimensional image sensor in a direction perpendicular to the one-dimensional direction, The rectangular coordinate value of the point can be obtained, and the amount of deviation between the cutting position of the building board and the pattern portion position can be easily calculated.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0017]
As shown in FIG. 1, when the plate 1 is viewed from above, the corner point A and the corner point C are formed with notches on one side, and the corner point B has such a notch. The notch portion is not formed, and the corner point D has a shape feature that it is formed in a stepped portion.
[0018]
In addition, there is also an architectural board that forms a handle with a flat bottom part (a handle part that becomes a groove part) and a handle convex part with a flat upper surface, but here, because it focuses on the outline of the handle part, The details of the handle are omitted.
[0019]
FIG. 2 is a top view showing the configuration of the building board printing apparatus according to the embodiment of the present invention. The building board printing apparatus obtains a deviation angle θ which is a remainder angle (90 degrees−angle formed) between the dimension a of the side AB and the dimension b of the side AD shown in FIG. 1 and the side AB and the side AD. Of course, it is possible to measure the dimensions of the side BC and the side CD by arranging the same point as the image sensor described below for the corner point C.
[0020]
A measurement method will be described.
-The board 1 is conveyed to the measurement position by the conveyor 10.
The side CD (actual side end) is pushed in the width direction of the plate 1 by the pusher 11 using a clevis type air cylinder, and the side AB is brought into contact with the ruler plate 12.
The corner point A includes a first image sensor 13A for detecting the corner point A, and the corner point B includes a second image sensor 13B for detecting the corner point. A third image sensor 13C for detecting the corner point is attached to the point D so as to be movable in the horizontal direction indicated by the double arrows by the high-accuracy linear motion mechanisms 14A, 14B, 14C provided respectively. ing.
[0021]
FIG. 3 is a diagram illustrating details of the image sensor and the high-precision linear motion mechanism. FIG. 3A is a diagram for explaining details of detection of the corner point A as viewed from the bottom of FIG. 2, and FIG. 3B is a further enlarged view as viewed from the right of FIG. The high-precision linear motion mechanism 14 includes a linear guider 21 and a slider 22 that moves along the linear guider 21. The position of the slider 22 with respect to the linear guider 21 can be detected. The image sensor 13 is set on the lower surface of the slider 22 with the detection sensor portion 23 parallel to the mounting surface of the plate 1 at a predetermined distance so as to face the handle surface of the plate 1. The detection sensor unit 23 includes a laser light emitting unit 24 and a laser light receiving unit 25. When, for example, the corner point A of the plate 1 is present, the laser light receiving unit 25 receives the laser light reflected by the corner point A. The presence of the plate 1 is detected. Since the laser light receiving unit 25 is a one-dimensional array of photodiodes 26 as shown in FIG. 3B, from the position of the boundary between the photodiodes 26 that receive signals and the photodiodes 26 that do not receive signals. The Y-axis coordinate value (see FIG. 2) of the corner point A is obtained. When the image sensor 13 is moved by the high-accuracy linear motion mechanism 14, the corner point A is detected by the image sensor 13 at an intermediate point, and the angle from the position of the high-accuracy linear motion mechanism 14 at that time is detected. The X-axis coordinate value of the part A (see FIG. 2) is obtained. In the present embodiment, since the plate 1 is brought into contact with the ruler plate 12, X = 0.
[0022]
FIG. 4 is a diagram schematically showing the output voltage waveform of each image sensor. Since the step state can be detected by the image sensor 13, each corner point can be detected. For example, in the detection of the corner point A, as shown in FIG. 4A, when the first image sensor 13A approaches the corner point A by the high-precision linear motion mechanism 14A, the corner point A is initially The planar position of the photodiode 26 corresponding to the step position when the signal is detected for the first time (there is a step) from the state where no signal is detected because it does not exist is the position of the corner point A.
[0023]
The concept of plane position here refers to the relative arrangement relationship of each corner point on the two-dimensional plane. Specifically, assuming an arrangement relationship on the XY plane when the side AB direction is the Y-axis direction and the direction orthogonal to the side AB is the X-axis direction, image processing simulation is performed, and each value to be obtained is determined. calculate.
[0024]
On the other hand, the center position (position on the XY plane) of the photodiode array constituting the first image sensor 13A and the center position (also position on the XY plane) of the photodiode array constituting the second image sensor 13B. If the distance L between the sensors is measured by an appropriate measuring means, a photodiode position corresponding to the step position when the step is first detected during the movement based on this dimension, The dimension of the side AB can be obtained by calculating the distance difference (for how many sensors) from each central position.
[0025]
In this way, the planar positions of the corner point B and the corner point D are also detected by the corresponding image sensors 13B and 13C (see FIGS. 4B and 4C). The X-axis coordinate value and the Y-axis coordinate value of the corner points A, B, and D are obtained, and the dimensions of the line segment AB, line segment BD, and line segment AD are the distances between the corner points on the two-dimensional plane. I want.
[0026]
And the inner angle A is the cosine theorem BD ² = AB ² + AD ² −2AB · ADcos (inner angle A)
Can be obtained from
[0027]
Further, the deviation angle θ is obtained as (90 degrees−inner angle A).
[0028]
Based on the dimensions of the side AB and the side AD thus obtained and the value of the deviation angle θ, the pattern data corrected based on the cutting error may be created as previously proposed. That is, the pattern data corrected by rotating and transforming the pattern data by the shift angle θ around the position of the corner point D is obtained. By controlling the jetting of ink jet based on the corrected pattern data thus obtained, the entire wall surface construction where a uniform ink jet printing is performed on the pattern portion of each building board and a large number of building boards are attached. The uniformity of the wall pattern can be ensured.
[0029]
The present invention is not limited to the above embodiment.
[0030]
Since the X-axis coordinate values of the corner points A and B are both known to be 0, the high-accuracy linear motion mechanisms 14A and 14B are not necessarily required, and the first image sensor 13A and the second image sensor 13B are fixed. Also good.
[0031]
Also for the corner point C, an image sensor and a high-accuracy linear motion mechanism may be provided to detect the position of the corner point C.
[0032]
【The invention's effect】
As described above, according to the present invention, even if it is not possible to cut the building board accurately with respect to the position of the pattern portion of the building board, it is possible to perform uniform inkjet printing on the pattern portion of each building board. The amount of deviation between the cutting position of the building board and the pattern portion position can be easily measured. Based on the measured deviation amount, the uniformity of the entire wall pattern in the wall surface construction in which a large number of building boards are attached is ensured by correcting and controlling the ejection of the ink jet.
[Brief description of the drawings]
FIG. 1 is a top view showing a building board having a four-way consensus structure.
FIG. 2 is a top view showing the configuration of the building board printing apparatus according to the embodiment of the present invention.
FIG. 3 is a diagram illustrating details of an image sensor and a high-precision linear motion mechanism.
FIG. 4 is a diagram schematically showing an output voltage waveform of each image sensor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Board 10 Conveyor 11 Pusher 12 Ruler board 13 Image sensor 14 High precision linear motion mechanism 21 Linear guider 22 Slider 23 Detection sensor part 24 Laser light emission part 25 Laser light reception part 26 Photodiode

Claims (3)

A transport means for transporting a four-way construction board,
Of the four corner points of the handle portion of the building board, the corner point from before cutting the handle portion (this corner point is referred to as point D) and the handle 2 of the three corner points at the corner points at both ends of the building board conveyance direction cutting line (of which, the corner point close to point D is point A and the corner point far from point D is point B) Position detecting means for detecting a relative position on the dimension;
Computing means for calculating an angle formed by the side AB and the side AD (this angle is referred to as an internal angle A) based on the position of the corner point detected by the position detecting means;
A building board printing apparatus comprising: control means for controlling the jetting of the ink jet by rotating the pattern data based on the inner angle A calculated by the computing means . A linear ruler plate extending along the building board conveying direction of the conveying means;
2. The building board printing apparatus according to claim 1, further comprising a pusher for pressing the building board in the width direction against the ruler board.   The at least one of the position detection means includes a one-dimensional image sensor and a linear motion mechanism that moves the one-dimensional image sensor in a direction perpendicular to the one-dimensional direction. The building board printing apparatus according to 1.

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