JP3050870B1 - Wood printing device and wood printing method - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a wood printing apparatus and a wood printing method using an ink jet that does not cause print collapse. SOLUTION: Even if the ink ejected from the print head 40 to the horizontal member W1 scatters and adheres to the print head 40 side and solidifies, the print head 40 is fixed and there is no movable part, so that printing is performed properly. Can be continued. For this reason, maintenance such as cleaning of the print head 40 becomes unnecessary.

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 and a wood printing method 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. In these conventional techniques, printing is performed by ink jet because the target wood has hygroscopicity.

[0004]

However, as described above, the printing by the ink jet printing is performed by the printing head perpendicular to the conveying direction of the printing medium, as can be understood from the head of the ink jet printer. It is performed while being sent. Printing on wood covers a wide printing area of several cm square, and unlike flat, glossy paper, a large amount of ink is required to clarify the printing. For this reason, a large amount of ink is sprayed, and in such an ink jet, the attached ink solidifies and the drive speed of the print head is reduced, and the print does not follow the wood transport speed, so the print is broken. A problem occurred.

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 and a wood printing method using an ink jet which does not cause print collapse.

[0006]

According to a first aspect of the present invention, there is provided a wood printing apparatus, comprising: a wood conveying means; a fixed ink jet print head having a plurality of ink ejection ports; , it becomes provided with a print control unit for controlling the injection of each ink ejection nozzle of the print head, the storage unit for storing print information and print control data, which have a calculator for calculating the print control data from the print information A wood printing device , wherein the printing information of the storage unit is stored.
Information is sent to the computing unit, and the computing unit transmits the timber transport speed.
Printing to control each ink ejection port of the print head from the degree
Generate control data, store it in the storage unit,
The timber processed by the transfer means is transferred, and
After recognizing the wood processed by the
The print control data is sent to the print control unit to
While transporting the material, check each ink ejection port of the print head
It is a technical feature that printing is performed by ejecting ink from the ink .

In the first aspect of the present invention, since the print head is fixed, even if ink adheres to the print head, the character of the print does not collapse. Appropriately printed on processed wood
It can be performed.

According to a second aspect of the present invention, there is provided a wood printing apparatus, wherein a wood conveying means, a fixed ink jet print head having a plurality of ink jetting ports, a sensor for detecting wood, and jetting of each ink jetting port of the print head. printing control unit for controlling, it becomes a transport control unit for controlling the conveying means, a storage unit for storing print information Mukuo and print control data, the calculator for calculating the print control data from the print information a perforated to wood printer, print information of the storage unit
Is sent to the computing section, and the computing section prepares the wood for printing.
Transport control data for transporting at the appropriate transport speed and transport speed
Each ink ejection port of the print head is controlled to correspond to
Print control data to be controlled and store it in the storage unit.
And transported wood processed by the transport means.
After recognizing the processed wood by the sensor,
A tree processed by sending transmission control data to the transport control unit
Transports the material, and print control data from the storage unit.
To the print control unit to prevent the processed wood from being transported.
Ink is ejected from each ink ejection port of the print head
It is a technical feature that the printing is performed by performing the printing .

According to the second aspect, since the print head is fixed, even if ink adheres to the print head, the character of the print does not collapse. In addition, the size of printing can be adjusted by changing the transport speed of the wood by the transport control unit. Furthermore, it is possible to print properly on the processed wood.
You.

Further, according to the third aspect of the present invention, a wood conveying means, a fixed ink jet print head having a plurality of ink ejection ports, a sensor for sensing wood, and control of ejection of each ink ejection port of the print head. A printing method for wood using a printing device having a printing control unit for storing printing information and printing control data, and a printing unit having a calculation unit for calculating printing control data from the printing information. Transmitting the print information of the storage unit to the calculation unit,
By generating print control data for controlling each ink ejection port of the print head from the transport speed of the wood in the arithmetic unit ,
This is stored in the storage unit and processed by the transporting means.
After the processed wood is conveyed and the processed wood is recognized by the sensor, the print control data is transmitted from the storage unit to the print control unit, and each ejection port of the print head is conveyed while the processed wood is conveyed. It is a technical feature that printing is performed by ejecting ink from the printer.

According to the third aspect of the present invention, since the print head is fixed, even if ink adheres to the print head, the character of the print does not collapse. Appropriately printed on processed wood
It can be performed.

According to a fourth aspect of the present invention, a wood conveying means, a fixed ink jet print head having a plurality of ink ejection ports, a sensor for sensing wood, and printing for controlling the ejection of each ink ejection port of the print head. A control unit, a transport control unit that controls the transport unit, and a storage unit that stores print information, transport control data, and print control data, and an operation that calculates print control data and transport control data from the print information A method of printing wood using a printing device having a unit, wherein the print information of the storage unit is transmitted to the calculation unit, and the control unit transports the wood at a transfer speed corresponding to printing in the calculation unit. , by generating the print control data which Seioroshi each ink ejection port of the print head so as to correspond to the transport speed, and stores it in the storage unit, the transport unit Processed wood transported, after recognizing the processed timber by the sensor, performs the transport of the timber conveyance control data is processed and transmitted to the transport controller, also print control data from said storage unit Is transmitted to the print control unit, and printing is performed by ejecting ink from each ejection port of the print head while transporting the processed wood.

According to the fourth aspect, since the print head is fixed, even if ink adheres to the print head, the character of the print does not collapse. In addition, the size of printing can be adjusted by changing the transport speed of the wood by the transport control unit. Furthermore, it is possible to print properly on the processed wood.
You.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wood printing apparatus and a wood printing method 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. 5 (A) is a so-called top view, and shows the numbering indicating the wood arrangement position so that the construction at the assembly site is easy. In this example, when viewed from the south, "I", "B", "C", etc. are displayed in the horizontal direction, and Arabic numerals "1,""2","3", etc. are displayed in the vertical direction. Thereby, the arrangement position and connection of each horizontal member and column member can be understood. For example, the horizontal member W1 is
It is connected to the horizontal member W2 at number 1 and column material W3 at number 1.
It can be seen that it is connected to the column member W4 at the numbered e.

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, wood (square) W
1 is put into a processing line (not shown), based on the processing data from the computer 70, the wood processing apparatus 80 has a tenon S2 for connecting to the horizontal member W2 and a pillar, as shown in FIG. A mortise hole S3 for connecting with the material 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 construction of the wood printing apparatus 10 will be described in more detail with reference to FIG. This printing device 10
Has belt conveyors 32 and 34 as means for transporting wood. The belt conveyors 32 and 34 each have a metal bar conveyor 33 suspended between drums 35 and 35. An ink jet print head 40 is provided between the belt conveyors 32 and 34. Drums 35, 3 on the print head 40 side of each belt conveyor 32, 34
5, a belt 37 is wound around the drive motor 3.
By rotating the print head 40, the transport speed on both sides of the print head 40, that is, the synchronization of the belt conveyors 32 and 34 is maintained. The belt 33 used for the belt conveyors 32 and 34 is preferably a metal or resin bar conveyor (ladder). This is because the contact with the wood surface is a line contact, and the printed surface is not contaminated by the contact with the belt after printing. Printing device 10 of the present embodiment
In the above, an example using a belt conveyor is shown, but a roll or the like can also be used.

The printing device 10 is provided with a control device 20. The control device 20 includes a print control unit 22 that controls the print head 40 and a transport control unit 24 that controls the drive motor 36 to adjust the transport speed of the wood W. In the printing apparatus 10 of the present embodiment, the transport control unit 24 is provided, but this may be omitted. That is, by making the speed of the drive motor 36 constant, when printing is performed, printing can be appropriately performed by generating print control data at the constant speed.

FIG. 3A 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. 3B is a view of the sensor 42 in FIG. 2 as viewed in the direction in which the wood is transported (arrow B in FIG. 2). The sensor 42 includes a pair of sensor holding members 42A,
2B, an infrared light emitter 42α is provided on the sensor holding member 42A side, and on the sensor holding member 42B side,
An infrared light receiver 42β for receiving infrared light from the infrared light emitter 42α is provided. Here, the wood is the sensor 4
2, the infrared ray is cut off, and a signal from the infrared ray detector 42β detecting this is output to the control computer 70 shown in FIG. In addition, as a sensor,
An X-ray sensor or any other device capable of detecting the presence or absence of wood can also be used.

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. In addition, floppy disk (F
It can be supplied via an auxiliary storage medium such as D), and can also be supplied online from another computer such as a LAN network.

Next, the printing process by the control computer 70 based on the print data will be described with reference to the flowchart of FIG. Here, as described above with reference to FIG. 1, after the lumber is subjected to the joining process in the wood processing device 80, the timber is conveyed to the wood printing device 10 after the printed surface faces downward. You. Since the processing is performed according to the serial numbers (W1, W2, W3), the wood printing apparatus 10 can easily recognize which position information corresponds to the processed lumber.

In FIG. 2, when the horizontal member W1 reaches the printing device 10 and a detection signal is sent from the sensor 42 (S1).
04: Yes), the arithmetic unit 72 sets the serial number (here, W
The position information (print data) corresponding to 1) is read from the storage unit 74 (S106). Then, the arithmetic section 72 creates print control data and transport control data from the print data and stores them in the storage section 74 (S108).

FIG. 4 shows how the print control data is created.
This will be described with reference to FIG. At the transport speed V, the distance L from the tip of the horizontal member W1 detected by the sensor 42 (FIG. 5)
(See (D)) If an attempt is made to print "A" at a distant position, the nozzle N4 is activated at t1 = L / V, and N3 at time t2 and N2, N3, N4, N5, N5 at time t3.
6 and N7 are activated at the same time, the ejection port N2 is activated at time t4, and the print control data is created so as to activate the ejection port N1 at time t5.

FIG. 4 shows the creation of the transport control data.
This will be described with reference to FIG. FIG. 5B shows the print character "A" when the printing is performed at a transport speed higher than V. In other words, by increasing the transport speed of wood,
By increasing the size (width) of the character in the transport direction (here, the horizontal direction) and reducing the transport speed, the size (width) of the character in the transport direction can be reduced. Thus, the transport control data indicating the transport speed is adjusted according to the size of the character.

Subsequently, the arithmetic section 72 sends the transport control data to the transport control section 24 of the control device 20 of the printing apparatus 10 (S110), and sends the print control data to the print control section 22 (S112). Thereby, the transport control unit 2
0 controls the speed of the drive motor 36, and the print control unit 22 activates each of the ejection ports N1 to N7 of the print head 40 while transporting the wood at the time designated by the print control data. Printing is executed as described above with reference to D). In this embodiment, the transport speed is controlled. However, the transport speed is not controlled, the transport speed is kept constant, and each ejection port of the print head 40 is printed with print data corresponding to the transport speed. Can also be launched.

In the wood printing apparatus and the printing method of the present embodiment, since 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. However, since the print head 40 is fixed and there is no movable part, printing can be properly continued. For this reason, maintenance such as cleaning of the print head 40 becomes unnecessary.

FIG. 4A shows the ejection port N of the print head 40.
The example of printing when 1-N7 is arrange | positioned perpendicular | vertical with respect to the conveyance direction of wood is shown. On the other hand, FIG.
By inclining and fixing the print head 40, the ejection ports N1 to
A print example when N7 is inclined by 40 degrees with respect to the direction of transport of the wood is shown. In this way, by tilting the injection port,
The size in the direction perpendicular to the character transport direction can be adjusted. That is, by adjusting the transport speed and the angle of the print head 40 as described above with reference to FIG. 4B, characters of a desired size can be printed.

In the above-described example, the transport control section 24 is provided on the control device 20 side of the printing apparatus 10 and the transport speed of the wood in the printing apparatus is made variable by the transport control data. By making the speed constant, it is possible to omit the generation of the above-described transport control data.

The transport speed in the printing device 10 is 1
-20 m / min is desirable. This is because it is suitable for printing on wood. In the example described above, printing was performed only once by the print head 40. Alternatively, after the printing, it is also possible to send the conveyance control data to reversely convey the timber and to perform the printing again. In this case, completely different information may be printed.

[0031]

As described above in detail, according to the present invention, since there is no movable part in the print head, the character of the print does not collapse.

[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. 2 is a block diagram of the wood printing apparatus in FIG. 1;

FIG. 3A is a perspective view of a print head, and FIG. 3B is a view of the sensor in FIG.

FIG. 4A, FIG. 4B, and FIG. 4C are explanatory diagrams of a printing example.

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.

FIG. 6 is a flowchart showing a printing process of a control computer in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wood printing device 20 Control device 22 Printing control unit 24 Transport control unit 32, 34 Belt conveyor (conveying means) 40 Print head 42 Sensor 70 Control computer 72 Operation unit 74 Storage unit 80 Wood processing device

Claims (6)

(57) [Claims] An ink jet print head having a plurality of ink ejection ports, a sensor for detecting wood, and a print control unit for controlling ejection of each ink ejection port of the print head. made with a storage unit for storing print information and print control data, a <br/> wood printing apparatus that have a calculator for calculating the print control data from the print information, the calculating the print information of the storage unit To the relevant section
Part at by generating print control data for controlling the respective ink ejection openings of the printing head from the conveying speed of the timber, which was stored in the storage unit, conveys the processed timber by said transport means, said Sen
After recognizing the wood processed by the
The print control data is sent to the print control unit to
While transporting the material, check each ink ejection port of the print head
Characterized by printing by ejecting ink from the wood
Printing device. 2. A means for conveying wood, a fixed ink jet print head having a plurality of ink ejection ports, a sensor for sensing wood, a print control unit for controlling ejection of each ink ejection port of the print head, and the conveyance. together comprising a transport controller for controlling the means, print information Mukuo and storage unit for storing print control data, chromatic to <br/> wood printing apparatus calculator for calculating the print control data from the print information a is to send the print information of the storage unit to the arithmetic unit, the operation
Transport system that transports wood at the transport speed corresponding to printing at the section
Control data and the print head so as to correspond to the transport speed.
Generate print control data to control each ink ejection port
Then, this is stored in the storage unit, and the wood processed by the transport means is transported, and
After recognizing the wood processed by the
To the transport control unit to transport the processed wood.
And print control data from the storage unit.
And print the processed wood while transporting it.
Print by ejecting ink from each ink ejection port of the head
Wood printing device characterized by performing. 3. A wood conveying means, a fixed ink jet print head having a plurality of ink ejection ports, a sensor for sensing wood, and a print control unit for controlling ejection of each ink ejection port of the print head. And a storage unit for storing print information and print control data, a method of printing wood using a printing device having a calculation unit for calculating print control data from the print information, wherein the print information in the storage unit is stored in the storage unit. the transmitted to the arithmetic unit, and a print control data for controlling the respective ink ejection openings of the printing head from the conveying speed of the timber is generated by the arithmetic unit, and stores it in the storage unit, processed by the transport means wood and the transport, after recognizing the processed timber by the sensor, and transmits the print control data to the print control unit from the storage unit, transport of the processed wood <br/> material Wood printing method and performing printing by the ink is ejected from each ejection port of the printing head while. 4. A wood conveying means, a fixed ink jet print head having a plurality of ink ejection ports, a sensor for detecting wood, a print control unit for controlling ejection of each ink ejection port of the print head, and the conveyance. A printing device comprising a transport control unit for controlling means, a storage unit for storing print information, transport control data and print control data, and an arithmetic unit for calculating print control data and transport control data from the print information A method for printing wood using the method described above, wherein the print information of the storage unit is transmitted to the calculation unit, and the calculation unit transfers the wood at a transfer speed corresponding to the printing. by generating print control data Seioroshi each ink ejection port of the print head so as to, stores it in the storage unit, the processed wood by said conveying means After transporting and recognizing the processed wood by the sensor, transport control data is transmitted to the transport control unit to transport the processed wood, and print control data from the storage unit is transmitted to the print control unit. A method of printing wood by transmitting the processed wood and ejecting ink from each ejection port of the print head while transporting the processed wood. 5. The wood printing apparatus according to claim 1, wherein the print information is position information. 6. The wood printing method according to claim 3, wherein the print information is position information.