JP2001232779A - Apparatus and method for printing timber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for printing a timber using an ink jet without collapse of printing. SOLUTION: Even when an ink injected from a print head 40 to a lateral installation material W1 side is scattered, adhered to the head 40 side and solidified, suitable printing can be continued since the head 40 is fixed and does not have a movable part. Therefore, maintenance such as cleaning or the like of the head 40 is not required.

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. Or as a wood joint, joint as a joint,
A tenon hole was being formed. 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 wood has been assembled with each other.

[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 the side surface of the structural member or column member or on the joint. Automated printing of position information is progressing,
For example, JP-A-62-297079 and JP-A-3-825
No. 01 discloses this. In these prior arts,
Printing is performed by inkjet 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; A print control unit that controls the ejection of each ink ejection port of the print head, a storage unit that stores print information and print control data, and a calculation unit that calculates print control data from the print information. Enter the position of the horizontal member from the floor plan, etc., generate position information in the calculation unit, store this position information in the storage unit as print information, transmit the print information of the storage unit to the calculation unit, The computing unit generates print control data for controlling each ink ejection port of the print head from the transport speed of the wood, stores the data in the storage unit, and transports the wood by the transport unit. After the wood is recognized by the sensor, the print control data is transmitted from the storage unit to the print control unit, and printing is performed by ejecting ink from each ink ejection port of the print head while transporting the wood. Characteristic.

In the printing apparatus according to the first aspect, since the print head is fixed, even if ink adheres to the print head, the print does not lose its character. In addition, since the ejection time of each ink jet nozzle is calculated in consideration of the transport speed, the printing position can be freely changed. Therefore, when printing is performed after processing the wood, the printing position may need to be changed depending on the size of the processed portion, which is suitable for printing after processing such wood. In the case of printing after processing wood, it is desirable to determine a position suitable for printing from the processed data when calculating the print control data, and to generate the print control data so as not to print on the processed portion.

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. A print control unit that controls the transfer unit, and a storage unit that stores print information and print control data, and a calculation unit that calculates print control data from the print information. The position of the horizontal member is input with reference to a floor plan and the like, position information is generated in the calculation unit, this position information is stored in the storage unit as print information, and the print information in the storage unit is transmitted to the calculation unit. The arithmetic unit generates print control data for controlling each ink ejection port of the print head from the transport speed of the wood, stores the print control data in the storage unit, and stores the print control data in the storage unit. After transporting the wood, the transport control data is transmitted to the transport control unit after the wood is recognized by the sensor, and the transport of the wood is performed.Also, the print control data is transmitted from the storage unit to the print control unit, and the wood is transmitted. It is a technical feature that printing is performed by ejecting ink from each ink ejection port of the print head while transporting the ink.

In the printing apparatus according to the second aspect, since the print head is fixed, even if ink adheres to the print head, there is no character distortion in printing. The size of printing can be changed by changing the transport speed of the wood by the transport control unit. Furthermore, since the ejection time of each ejection port of the ink jet is calculated on the premise that the conveyance speed is controlled, the printing position can be freely changed. Therefore, when printing is performed after processing the wood, the printing position may have to be changed depending on the size of the processed portion, which is suitable for printing after processing such wood. When printing after processing of wood, when calculating print control data and transport control data, determine a position suitable for printing from the processed data and generate print control data and transport control data if printing is not performed on the processed part It is desirable to make it.

Further, in the wood printing method according to the third aspect, a wood conveying means, a fixed ink jet print head having a plurality of ink ejection ports, a sensor for sensing wood, and ejection of each ink ejection port of the print head. A printing method for wood using a printing device comprising a printing control unit for controlling printing control data, a storage unit for storing printing information and printing control data, and a calculating unit for calculating printing control data from the printing information. Then, the position of the horizontal member is input with reference to a floor plan or the like, position information is generated in a calculation unit, this position information is stored in a storage unit as print information, and the print information in the storage unit is calculated by the calculation. The printing unit transmits print control data for controlling each ink ejection port of the print head from the transport speed of the wood in the arithmetic unit, and stores the generated print control data in the storage unit. By transporting the wood by the means, after recognizing the wood by the sensor, transmitting print control data from the storage unit to the print control unit, and ejecting ink from each ejection port of the print head while transporting the wood. Printing is a technical feature.

In the printing method according to the third aspect, since the print head is fixed, even if the ink adheres to the print head, the printing is not distorted. Further, since the ejection time of each ejection port of the ink jet is calculated in consideration of the transport speed, the printing position can be freely changed. Therefore, when printing is performed after processing the wood, the printing position may need to be changed depending on the size of the processed portion, which is suitable for printing after processing such wood. When printing is performed after processing wood, it is preferable to determine a position suitable for printing from the processed data when calculating the print control data, and to generate print control data so as not to print on the processed portion.

According to a fourth aspect of the present invention, there is provided a wood printing method, wherein a wood conveying means, a fixed ink jet type print head having a plurality of ink jetting ports, a sensor for detecting wood, and control of jetting of each ink jetting port of the print head. Printing control unit, comprising a transport control unit for controlling the transport unit,
A method for printing wood using a printing device having 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, comprising: Input the position of the horizontal member with reference to etc., generate position information in the calculation unit,
This position information is stored in a storage unit as print information, and the print information in the storage unit is transmitted to the arithmetic unit, and the arithmetic unit performs transport control data for transporting the wood at a transport speed corresponding to printing, Generates print control data for controlling each ink ejection port of the print head to correspond to the speed, stores it in the storage unit, transports the wood by the transport unit, and recognizes the wood by the sensor. After doing
The transport control data is transmitted to the transport control unit to transport the wood, and also, the print control data is transmitted from the storage unit to the print control unit, and the wood is transported from each ejection port of the print head. It is a technical feature that printing is performed by ejecting ink.

In the printing method according to the fourth aspect, since the print head is fixed, even if ink adheres to the print head, the print does not become misaligned. The size of printing can be changed by changing the transport speed of the wood by the transport control unit. Furthermore, since the ejection time of each ejection port of the ink jet is calculated on the premise that the conveyance speed is controlled, the printing position can be freely changed. Therefore, when printing is performed after processing the wood, the printing position may need to be changed depending on the size of the processed portion, which is suitable for printing after processing such wood. When printing after processing wood, when calculating print control data and transport control data, determine a position suitable for printing from the processed data and generate print control data and transport control data so that printing is not performed on the processed part It is desirable to make it.

[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
2 is numbered 1 and mortise hole S3 is mortise hole S4.
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 given to each of the horizontal members and the column members, and the position information (print position and printing position) of the joint of each horizontal member is made to correspond to each serial number. The print 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), 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, the lumber is subjected to the joint joint processing by the lumber processing apparatus 80, and then is conveyed to the lumber printing apparatus 10 after the printed surface faces downward. Is done. 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 wood.

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. At this time, how far from the leading end the printing is performed is calculated based on the processing data. L increases as the degree of processing increases. That is, the print control data is calculated based on the transport speed and the processing data. When the degree of processing is the same, the printing position is the same. Therefore, if the transport speed is constant, it is not necessary to consider the transport speed when calculating the print control data. However, in the present invention, since the printing position varies depending on the degree of processing, it is necessary to consider the transport speed even when the transport speed is constant in calculating the print control data.

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. The printing position can be changed by controlling the transport speed, but the printing position is calculated based on the processing data. That is, the transport control data is calculated based on the print data and the print control data.

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

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[Procedure amendment]

[Submission Date] March 3, 2000 (200.3.3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

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. D) The side of the wood as described above with reference to D)
To perform printing on. 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.

Claims (4)

[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. A storage unit for storing print information and print control data; and a calculation unit for calculating print control data from the print information. The calculation unit generates position information, and the position information is stored in the storage unit as print information. The print information of the storage unit is transmitted to the calculation unit, and the calculation unit generates print control data for controlling each ink ejection port of the print head from the transport speed of the wood, and stores the print control data in the storage unit. After the wood is conveyed by the conveyance means and the wood is recognized by the sensor, print control data is transmitted from the storage unit to the print control unit, and the wood is conveyed. Wood printing apparatus and performs printing by ejecting ink from the ink ejection ports of the printing head while. 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. A transport control unit for controlling the means, a storage unit for storing print information and print control data, and an arithmetic unit for calculating print control data from the print information,
The calculation unit generates position information, stores the position information in the storage unit as print information, transmits the print information in the storage unit to the calculation unit, and calculates the print head of the print head from the transport speed of the wood in the calculation unit. After generating print control data for controlling each ink ejection port, storing the print control data in the storage unit, transporting the wood by the transport unit, recognizing the wood by the sensor, and controlling the transport control data to the transport control. The print control data is transmitted from the storage unit to the print control unit, and the ink is ejected from each ink ejection port of the print head while transporting the wood to perform printing. 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. A method of printing wood using a printing device having a storage unit for storing print information and print control data, and a calculation unit for calculating printing control data from the print information, wherein position information is generated in the calculation unit. The position information is stored in the storage unit as print information, and the print information in the storage unit is transmitted to the calculation unit, and the calculation unit controls each ink ejection port of the print head from the transport speed of the wood. The print control data to be generated is stored in the storage unit, the wood is transported by the transport unit, and the wood is recognized by the sensor. It transmits the print control data to the print controller from wood printing method and performing printing by the ink is ejected from each ejection port of the print head while transporting the timber. 4. 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. A printing unit 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 position information is generated in a calculation unit, the position information is stored in a storage unit as print information, and the print information in the storage unit is transmitted to the calculation unit, and the calculation is performed. And transport control data for transporting wood at a transport speed corresponding to printing, and controlling each ink ejection port of the print head so as to correspond to the transport speed. Generate print control data, store it in the storage unit, transport the wood by the transport unit, recognize the wood by the sensor, and then transmit transport control data to the transport control unit to transport the wood. Wood printing, wherein printing is performed by transmitting print control data from the storage unit to the print control unit and ejecting ink from each ejection port of the print head while transporting wood. Method.