JP2000354984A - On-wood printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-wood print device without letter distortion even when printing from below. SOLUTION: A horizontal member W1 finishing the printing on a lower surface is carried by a roller 32 of a driving roller conveyor. Hereby, a recessed part is formed on a central part of the roller 32, and it does not make contact with a central part where the printing of the horizontal member W1 is carried out. Consequently, the roller 32 and the printed part never make contact with each other, and printed letters are never rubbed and distorted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood printing apparatus for printing position information of precut wood.

[0002]

2. Description of the Related Art Conventionally, in the construction of wooden houses, in the frame construction method of pillars or horizontal members, a site worker such as a carpenter has to make a column or horizontal member of a predetermined size at a work site. In addition, mortars and mortise holes are formed as joints and joints between woods. In recent years, a so-called pre-cut method has been introduced for the processing of these lumbers, the required processing of the lumbers has been performed in advance at a dedicated pre-cutting factory, the processed lumbers have been transported to a construction site, and the lumbers have been assembled.

[0003] For assembling, positional information indicating which cross member is combined with which other cross member or column member is required. The position information is printed on a side surface or a connection of the frame member or the pillar member. Printing of position information has been automated, for example, as described in JP-A-62-297079 and JP-A-3-82501.
There is a disclosure in Japanese Patent Publication No.

[0004]

As for such printing, a method of printing wood (square material) conveyed on a conveyor from above, a method of printing from the side, and a method of printing from below are considered. obtain. On the other hand, printing is most appropriately performed by inkjet because the target wood is not flat unlike paper.

[0005] Here, printing from above or printing from the side is advantageous in that printing by ink jet is not rubbed by a conveyor. However, the size of the wood varies, and in order to print from above or from the side, it is necessary to move the position of the print head according to the size of the wood.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a wood printing apparatus which does not cause character distortion even when printing is performed from below.

[0007]

According to a first aspect of the present invention, there is provided a wood printing apparatus including a driving roller conveyor using a roller having a concave portion formed in a central portion thereof, and an ink ejection port disposed upward. And a print head.

In a second aspect of the present invention, there is provided a wood printing apparatus according to the first aspect, wherein the print head is disposed between rollers of the drive roller conveyor.

According to the first aspect of the present invention, the ink jet port of the print head is arranged upward to print on the lower surface of the wood. Here, since the concave portion is formed at the center of the roller of the drive roller conveyor, the wood print supported by the roller does not come into contact with the roller. For this reason, the print on the lower surface of the wood is not rubbed and distorted.

According to the second aspect, since the print head is disposed between the pair of rollers, printing can be performed without interference by the rollers.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wood printing apparatus according to an embodiment of the present invention will be described in detail. Prior to the description of the wood printing apparatus of the present embodiment, the numbering in the pre-cut method will be described with reference to FIG. FIG.
(A) is a so-called floor plan, and represents a number indicating a timber arrangement position so that construction at an assembly site is easy. In this example, when viewed from the south, "i", "b",
"C" or the like is displayed, and the Arabic numeral "1", "2", "3", or the like is displayed in the vertical direction, whereby the arrangement position and connection of each horizontal member and column member can be understood. It has been like that. For example, the horizontal material W1
2 is connected to the column member W3 at number C1, and is connected to the column member W4 at number E1.

FIG. 1 shows a wood printing apparatus 1 according to an embodiment.
The configuration of a precut facility using 0 is shown. Here, the control computer 70 and the computer 70
Wood processing equipment 80 that processes wood according to instructions from
And a wood printing device 10 for printing on wood processed by the wood processing device 80. The control computer 70 includes a storage unit 74 for storing processing data, print data to be described later, calculated print control data, transport control data, and the like; a calculation unit 72 for performing various calculations; a monitor 76; And

As shown in FIG. 5B, the wood (square) W
1 is put into a processing line (not shown), the wood processing apparatus 80
As shown in FIG. 5C, a tenon S2 for connecting to the horizontal member W2, a tenon hole S3 for connecting to the column member W3,
A joint process for forming a tenon S4 for connection with the column member W4 is performed. Then, the horizontal member W1 on which the connections S2, S3, and S4 are formed is transported to the wood printing apparatus 10 and the tenon S
1 is numbered 1 and the mortise hole S3 is numbered C1.
Is printed.

The wood printing apparatus 10 includes a drive roller conveyor 30 for driving each roller 32 as a wood transport mechanism.
Having. A pair of rollers 3 of the driving roller conveyor 30
2, 32, an ink jet print head 40
Are arranged. The print head 40 includes the print control device 4
4.

FIG. 2A is a perspective view of the print head 40 shown in FIG. The print head 40 has seven independent ejection ports N1, N2, N3, N4, N5, N for ejecting ink.
6, N7 are arranged in a line on the upper surface. As the print head 40 of the present embodiment, any type of ink jet type that ejects ink can be used.
The print head 40 is fixed to the printing device 10.
That is, in the printing apparatus of the prior art, the print head 40
Is driven perpendicular to the direction of transport of the wood, whereas in the present embodiment, it is fixed. In the present embodiment, as the print head, one in which the ejection ports are arranged in a line is used. Can also be improved. The injection port is 5-30
, Desirably 10 to 20 are suitable.

FIG. 2B is a view of the sensor 42 shown in FIG. 1 as viewed in the direction in which the wood is transported. The sensor 42 is
An infrared light emitter 42α is provided on the sensor holding member 42A side, and an infrared light emitter 42α is provided on the sensor holding member 42B side.
An infrared light receiver 42β for receiving infrared light from the camera is provided. Here, when the wood reaches the sensor 42,
Infrared ray is blocked, and infrared ray detector 42β detecting this
Is output to the control computer 70 shown in FIG. Note that an X-ray sensor or any other sensor that can detect the presence or absence of wood can be used as the sensor.

FIG. 3 shows the driving roller conveyor 30 shown in FIG.
FIG. 4 is a cross-sectional view of the roller 32 of the drive roller conveyor 30. FIG. The drive roller conveyor 30 includes a plurality of rollers 32 rotatably supported by a pair of guide plates 31. A sprocket 34 is attached to each roller 32 through the guide plate 31.
Is suspended by a chain 36. Each of the rollers 32 is driven by the chain 36. Each roller 32 is disposed at an interval of 15 cm.

As shown in the sectional view of FIG.
Is formed to have a diameter of 5 cm and a length of 40 cm, and a concave portion 32 a having a step of 1 mm is formed in the center portion over 7 to 8 cm. In FIG. 4, the step of the concave portion 32a is clearly shown for convenience of illustration, but the step of 1 mm for a diameter of 5 cm is a level that is difficult to visually recognize in practice. The step is 0.5
A range of mm to 3 mm is desirable. If it is less than 0.5 mm, the roller may come into contact with the wood. Conversely, if it exceeds 3 mm, the wood becomes unstable when a part of the wood rides on the concave portion 32a. In the present embodiment, the roller 32
Is made of a metal rod, but a resin, rubber or the like having flexibility can be used instead.

The generation of position information (print data) by the control computer 70 is performed according to Japanese Patent Application Laid-Open No. 3-82501. First, a basic grid (coordinates, for example, the horizontal axis is 1, 2, 3,..., And the vertical axis is I, B,
.. Are displayed, and the positions of the horizontal members and the column members are input with reference to the floor plan (FIG. 5).
(A)). Then, serial numbers (W1, W2,...), Which are identifiers, are assigned to each of the horizontal members and the column members, and position information (printing position and printing) of the connection portion of each horizontal member is made to correspond to each serial number. The content (numbering) is generated by the calculation unit, and this is stored in the storage unit 74 as print data. The print data can be input via an input device such as the keyboard 78. Further, it can be supplied via an auxiliary storage medium such as a floppy disk (FD).
It can be supplied from another computer on-line such as an N network.

Next, wood processing and wood printing in the pre-cut facility shown in FIG. 1 will be described. FIG.
As shown in FIG. 5B, when the wood (horizontal member) W1 is put into a processing line (not shown), the wood processing apparatus 80 is operated based on the processing data from the computer 70 as shown in FIG. The joint processing is performed to form a tenon S2 for connecting to the horizontal member W2, a tenon hole S3 for connecting to the column member W3, and a tenon S4 for connecting to the column member W4. And the horizontal member W1 on which the connections S2, S3, S4 are formed,
It is conveyed to the wood printing device 10 and numbered 1 on the tenon S1.
However, the number C is printed in the mortise S3 and the number 1 is printed in the mortise S4.

The printing by the wood printing apparatus 10 will be described in more detail. The horizontal member W1 is the printing device 10
When it reaches, it is conveyed by the drive roller conveyor 30.
When the detection signal is output from the sensor 42, the computer 70 outputs the print data to the print control device 44 at a predetermined timing. The print control device 44 drives the print head 40 to eject ink from the ejection ports N1, N2, N3, N4, N5, N6, and N7 described above with reference to FIG. Is printed on the lower surface of the. In the present embodiment, the print head 40 includes the roller 32 and the roller 32.
And printing can be performed appropriately without interference from the driving roller conveyor.

The horizontal member W1 on which the printing of the item a1 on the lower surface is completed.
Is continuously transported by the rollers 32 of the drive roller conveyor 30 as shown in FIG. Here, as described above, the concave portion 32a is formed in the central portion of the roller 32, and is configured so as not to come into contact with the printed central portion of the horizontal member W1. For this reason, the roller 32 does not come into contact with the printed portion, and the printed image is not rubbed and distorted.

When a large amount of ink is ejected upward to the wood side, the scattered ink tends to adhere to the print head 40 and solidify. For this reason, in the present embodiment, the print head 40
Are fixed as described above. That is, since there is no movable portion, printing can be properly continued. The transport speed of the drive roller conveyor 30 is preferably 1 to 20 m / min. This is because such speed is suitable for printing on wood.

[0024]

As described above in detail, according to the present invention, since the concave portion is formed at the center of the roller of the drive roller conveyor, the print of wood supported by the roller comes into contact with the roller. There is no. For this reason, the print on the lower surface of the wood is not rubbed and distorted.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a facility of a precutting method using a wood printing device according to an embodiment of the present invention.

FIG. 2A is a perspective view of a print head, and FIG.
(B) is a side view of the sensor.

FIG. 3 is a plan view of the drive roller conveyor in FIG.

FIG. 4 is a sectional view of a roller of the drive roller conveyor in FIG. 1;

5 (A) is a plan view used in the pre-cutting method, and FIGS. 5 (B), 5 (C), and 5 (D) are bottom views of the horizontal members.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wood printing apparatus 30 Drive roller conveyor 32 Roller 32a Central part 34 Sprocket 36 Chain 40 Print head 42 Sensor 44 Printing control apparatus 70 Control computer 72 Operation part 74 Storage part 80 Wood processing equipment

Claims (2)

[Claims] 1. A wood printing apparatus comprising: a driving roller conveyor using a roller having a concave portion formed in a central portion; and a print head having an ink ejection port arranged upward. 2. The print head according to claim 1, wherein the print head is disposed between rollers of the drive roller conveyor.
Wood printing equipment.