JP4769072B2 - Building board painting equipment - Google Patents

Description

  The present invention relates to a building board coating apparatus for coating the surface of a building board using an ink jet type coating machine.

  Conventionally, when painting building boards such as cement-based exterior boards, it is common to apply paint to the surface of building boards using a spray coater, roll coater coater, flow coater coater, etc. Is. However, with such sprays, roll coats, flow coats, etc., it is difficult to paint a complex pattern, especially to a building board with irregular irregularities such as an exterior board. . On the other hand, painting is also performed using printing rolls such as letterpress and intaglio, but in this case, the same pattern is repeatedly applied, which tends to be a monotonous pattern and the pattern to be painted. When changing, it is necessary to replace the printing roll, and it is not possible to paint a different pattern for each building board.

  Recently, it has been proposed to paint the surface of a building board by using an ink jet printer as a coating machine and spraying the paint from the coating nozzle head of the ink jet type coating machine while feeding the building board (for example, (See Patent Document 1).

Inkjet coating machines can be applied to the surface of the building board in a non-contact manner using paint sprayed from the paint nozzle head, and by controlling the spray of paint from the paint nozzle head The paint can be sprayed to an arbitrary position on the building board so as to have an arbitrary pattern, and the building board having irregularities on the surface can be coated with a complicated pattern. In particular, the control of spraying paint from the painting nozzle head can be set for each building board supplied to the ink jet coating machine, so that it is possible to paint a different pattern for each building board. is there.
JP 2005-74666 A

  When painting with an inkjet coating machine while feeding the building board as described above, the paint is sprayed from the painting nozzle head when the building board passes under the coating nozzle head, and the paint is applied to the surface of the building board. Therefore, it is necessary to start spraying the paint from the painting nozzle head in time with the building board carried into the ink jet type coating machine.

  For this reason, in the above-mentioned Patent Document 1, the “board arrival detection sensor” that detects the arrival of the building board when the building board reaches a predetermined position, and the “board speed detection” that detects the conveyance speed of the building board. An encoder, and controls the timing to start spraying paint from the coating nozzle head based on the plate arrival signal detected by the “plate arrival detection sensor” and the speed data detected by the “plate speed detection encoder” I have to.

  Here, as the “plate speed detection encoder” for detecting the conveyance speed of the building board of Patent Document 1, it is generally formed using a rotary encoder, but the rotary encoder measures the rotation angle of the rotary shaft. This is based on the principle of detecting the speed. In order to detect the conveyance speed of the building board with the rotary encoder, the disk provided on the rotating shaft is brought into contact with the building board being conveyed, and the disk is rolled and rotated by the movement of the building board. This is done by measuring the rotation angle of the rotation shaft accompanying the rotation of.

  As described above, the “plate speed detection encoder” of Patent Document 1 detects the feed speed by contacting the building board. However, the surface of the building board is generally uneven, and particularly the building board formed with an uneven pattern has large unevenness. And in the "plate speed detection encoder" of patent document 1 which measures a speed by rolling and rotating a disk on the surface of a building board having such unevenness, the disk does not rotate accurately due to the unevenness. It is difficult to accurately detect the speed of Therefore, in the thing of patent document 1, the timing which starts the injection of the coating material from the coating nozzle head is controlled based on the plate arrival signal detected by the “plate arrival detection sensor” and the speed data detected by the “plate speed detection encoder”. Since the accuracy of detecting the speed of the building board by the “plate speed detection encoder” is low, the spraying of the paint from the coating nozzle head is started with the timing precisely matched to the building board conveyed to the ink jet type coating machine. It was difficult to do and had a problem in the accuracy of the design for painting on the building board.

  The present invention has been made in view of the above points, and can accurately start the injection of paint from the coating nozzle head in time with the building board conveyed to the ink jet type coating machine. Another object of the present invention is to provide a building board coating apparatus capable of coating with high design accuracy.

Coating apparatus of the building board according to the present onset Ming, while feeding a building board 1 in conveyor 5, by injecting the coating material from the coating nozzle head 3 of the ink jet atomizer 2, painting the surface of the building board 1 as in the a coating apparatus of the building board, a plate detecting sensor 6 for detecting passage of said building board 1 is carried into the ink-jet atomizer 2 by the conveyor 5, sent by the conveyor 5 wherein the speed of the building board 1 and a speed sensor 7 for detecting a non-contact, said plate detecting sensor 6 is the ink jet coating at a distance less than the length in the feed direction of the building board 1 than the speed sensor 7 disposed closer to the machine 2, the coating on the basis of said building board 1 speed by the plate detecting detects that said speed sensor 7 of the building board 1 by the sensor 6 Nozuruhe It is characterized in that comprising so as to control the timing of the start of injection of the coating material of de 3.

In coating apparatus of the building board, it is preferable to use a Doppler velocity sensor as said speed sensor 7.

In coating apparatus of the building board, the conveyor 5, the position for loading the building board 1 to the ink-jet atomizer 2, a position for unloading the building board 1 that is coated with the ink-jet atomizer 2 It is preferable that it is formed by a single belt conveyor 5a.

  According to the present invention, in controlling the timing of starting the spraying of the paint of the coating nozzle head 3 based on the detection of the building board 1 by the board detection sensor 6 and the speed of the building board 1 sent by the speed sensor 7, the speed sensor 7 detects the speed of the building board 1 in a non-contact manner. Therefore, even if the surface of the building board 1 is uneven, the speed of the building board 1 can be detected with high accuracy and conveyed to the ink jet coating machine 2. The spraying of the paint from the coating nozzle head 3 can be started accurately in time with the building board 1 to be applied, and the building board 1 can be coated with high design accuracy.

  Hereinafter, the best mode for carrying out the present invention will be described.

  As shown schematically in FIG. 2, the coating apparatus includes a coating nozzle head 3 provided with a spray nozzle 4, a paint supply tank 11 for supplying paint to the spray nozzle 4 of the paint nozzle head 3, and a spray nozzle of the paint nozzle head 3. 4 includes an ink jet coating machine 2 provided with a coating control system 12 for controlling the spraying of paint from 4 and a transport conveyor 5 for transporting the building board 1.

  The coating nozzle head 3 is provided at the lower end of the ink jet coating machine 2 and is formed as a long line head in a direction perpendicular to the feeding direction of the building board 1. A plurality of (for example, 30) single heads 16 are attached to the lower surface of the coating nozzle head 3 in a line in the longitudinal direction of the coating nozzle head 3 as shown in FIG. The single head 16 is formed in a rectangular shape on the bottom surface, and a large number of jet nozzles 4 are formed on the bottom surface of the single head 16. The spray nozzles 4 are arranged in the longitudinal direction of the single head 16 at predetermined constant intervals. In the embodiment of FIG. 4, the spray nozzles 4 are provided in four rows on the single head 16. By attaching a plurality of single heads 16 provided with the spray nozzles 4 to the coating nozzle head 3 in the longitudinal direction in this way, a large number of spray nozzles 4 are arranged in the longitudinal direction of the coating nozzle head 3. Can be provided. Here, the single head 16 is attached to the coating nozzle head 3 with its longitudinal direction inclined at a predetermined angle with respect to the feeding direction of the building board 1. The pitch of the adjacent injection nozzles 4 in the direction perpendicular to the feed direction of 1 (the width direction of the building board 1) is reduced so that coating can be performed with high density dpi.

  The coating nozzle head 3 is formed of four types of coating nozzle heads 3y, 3c, 3m, and 3k that eject paints of yellow, cyan, magenta, and black, so that full-color printing can be performed. is there. Similarly, the paint supply tank 11 is also composed of four types. The paint supply tank 11y for supplying yellow paint is applied to the coating nozzle head 3y, and the paint supply tank 11c for supplying cyan paint is applied to the coating nozzle head 3c. The paint supply tank 11m for supplying magenta paint is connected to the paint nozzle head 3m, and the paint supply tank 11k for supplying black paint is connected to the paint nozzle head 3k. The coating nozzle heads 3y, 3c, 3m, and 3k are arranged along the conveying direction of the building board 1.

  The painting control system 12 includes various CPUs, ROMs, RAMs, and the like, and includes a painting data creation unit, a painting control unit, an injection nozzle control unit, and the like. The painting data creation unit inputs and stores the color pattern data obtained by scanning the original image with a scanner or the like, and the painting control unit paints the color pattern data corresponding to the building board 1 to be painted. A control signal is output from the data creation unit to the ejection nozzle control unit based on the color pattern data. The spray nozzle control unit is connected to each spray nozzle 4 of the coating nozzle heads 3y, 3c, 3m, and 3k, and controls each spray nozzle 4 based on a control signal input from the spray nozzle control unit. . Each of the spray nozzles 4 is controlled to be sprayed by, for example, a piezo control method, and the spray nozzle control unit controls each spray nozzle 4 to spray and stop the yellow, cyan, magenta, and black paints. Can be individually controlled to perform painting by full color printing corresponding to the color pattern.

The conveyor 5 is formed by a belt conveyor such as a timing belt, and is disposed below the inkjet coating machine 2. As shown in FIG. 2 (b), the conveyer 5 has a coating area A _{2 at a} position directly below the ink jet type coating machine 2 from a carry-in area A _{1 at} the front position where the building board 1 is introduced into the injecting type coating machine _2. , and it is disposed over the discharge area a ₃ of the rear position deriving a building board 1 from the ink jet atomizer 2.

The plate detecting sensor 6 and speed sensor 7 arranged above the loading area A ₁ of the conveyor 5 is provided. As shown in FIG. 1, the plate detection sensor 6 is arranged closer to the ink jet type coating machine 2 at a distance shorter than the speed sensor 7 in the feed direction of the building board 1.

The plate detecting sensor 6 is intended to be formed by an optical sensor such as a photoelectric switch having, for example, light-emitting element and a light receiving element, a building board 1 conveyor 5 which is introduced over the loading area A ₁ of the conveyor 5 Thus, the tip of the building board 1 is detected in a non-contact manner when being conveyed to the ink jet type coating machine 2. The speed sensor 7 is formed by, for example, a Doppler type speed sensor, and detects the speed at which the building board 1 is transported to the ink jet coating machine 2 in the carry-in area A ₁ of the transport conveyor 5. is there. The Doppler type velocity sensor is formed by including a transmission / reception device that transmits a wave such as a sound wave or an electromagnetic wave and receives a wave reflected by the building board 1, and the frequency (or wavelength) of the transmission wave and the reception wave. From this difference, the feeding speed of the building board 1 can be detected in a non-contact manner. In the present embodiment, the speed sensor 7 detects the conveyance speed of the building board 1 when the board detection sensor 6 detects the tip of the building board 1.

  As shown in FIG. 1, the coating control system 12 includes an arithmetic CPU 17, an amplifier 18, a sequencer 19, and a control CPU 20. The plate detection sensor 6 is an arithmetic CPU 17, and the speed sensor 7 is an amplifier. 18 to the CPU 17 for calculation. And if the front-end | tip of the building board 1 is detected by the board detection sensor 6, the detection signal will be input into CPU17 for calculation, and the building board 1 by the speed sensor 7 will be controlled by the calculation CPU17 with the input of this detection signal. The transport speed is detected, and the speed data detected by the speed sensor 7 is input to the calculation CPU 17. When the detection signal and the speed data are input to the calculation CPU 17 in this way, the start timing of jetting the paint from the coating nozzle head 3 is calculated, and the control CPU is connected via the sequencer 19 based on the calculation result. And the coating nozzle head 3 is controlled.

Thus, when the surface of the ceramic building board 1 such as a cement board is coated with the coating apparatus formed as described above, the building board 1 is first introduced onto the carry-in area A _{1 of the} conveyor 5. The introduced building board 1 is sent to the ink jet coating machine 2 by the conveyor 5, but when the tip of the building board 1 passes the position of the board detection sensor 6, as described above, the board detection sensor 6 The front end of the building board 1 is detected, and the speed sensor 7 detects the conveyance speed of the building board 1. Then, as described above, based on the detection signal detected by the plate detection sensor 6 and the speed data detected by the speed sensor 7, the timing at which the coating control system 12 starts to inject the paint from the coating nozzle head 3 is calculated. Is done.

  That is, when the front end of the building board 1 transported by the transport conveyor 5 reaches directly below the spray nozzle 4 of the coating nozzle head 3, it is necessary to start spraying paint from the coating nozzle head 3. The time obtained by dividing the distance D between the position of the detection sensor 6 and the position of the coating nozzle head 3 by the conveying speed V of the building board 1 (T = D / V) is the time when the coating nozzle head 3 starts spraying the paint When the timing time (T = D / V) has elapsed from when the tip of the building board 1 is detected by the board detection sensor 6, the paint from the coating nozzle head 3 is calculated. The coating nozzle head 3 is controlled by the coating control system 12 so as to start the injection.

Here, when four types of coating nozzle heads 3y, 3c, 3m, and 3k are arranged along the conveying direction of the building board 1 for full color coating, the coating is applied to each of the coating nozzle heads 3y, 3c, 3m, and 3k. It is necessary to calculate the injection start timing time. For example, when the distance D ₁ of the between the plate detection sensor 6 and the paint nozzle head 3y is 1 m, the conveying speed V of the building board 1 that has been detected by the speed sensor 7 is assumed to be 40 m / min, building board 1 Control is performed so that the injection of paint from the coating nozzle head 3y starts when a timing time of 1 m / (40 m / min) = 1.5 seconds has elapsed since the tip of the sheet is detected by the plate detection sensor 6. Is done. If the interval between the coating nozzle heads 3y, 3c, 3m, and 3k is 0.2m, the spraying of the coating from the coating nozzle head 3c starts when the timing time of 1.8 seconds elapses from the same calculation. When the 2.1 second timing elapses, the spraying of paint from the coating nozzle head 3m starts, and when the 2.4 second timing elapses, the spraying of paint from the coating nozzle head 3k starts. To be controlled.

  In calculating and controlling the timing time from when the front end of the building board 1 is detected by the board detection sensor 6 to when the coating nozzle head 3 starts to inject paint as described above, the belt travel of the conveyor 5 Although it is possible to calculate the timing time based on the speed, the travel speed of the transport conveyor 5 and the transport speed of the building board 1 are determined by the slip of the building board 1 on the transport conveyor 5 or the slip of the belt itself. May not match, and in this case, when the tip of the building board 1 reaches the position of the coating nozzle head 3, the spraying of the paint from the coating nozzle head 3 cannot be started accurately, and the coating nozzle head The paint sprayed from 3 will not be applied to the exact position of the building board 1 and may not be applied with high design accuracy. Even if the building board 1 slips on the transport conveyor 5 or the belt itself slips by detecting the transport speed of itself and calculating the timing time, the coating nozzle head 3 is not affected by this. When the front end of the building board 1 reaches the position, the coating nozzle head 3 can accurately start spraying the paint, and the coating board 1 can be applied to the accurate position of the building board 1 with high design accuracy. Moreover, in the present invention, since the speed of the building board 1 is detected in a non-contact manner using a Doppler type speed sensor or the like as the speed sensor 7, even if the surface of the building board 1 is uneven, the unevenness is affected. The feeding speed of the building board 1 can be detected with high accuracy without being received, and the timing time can be accurately calculated to coat the building board 1 with high design accuracy.

Each paint nozzle head 3y of the ink jet atomizer 2 as described above, 3c, 3m, while being injected paint from 3k, conveying the building board 1 is passed through the paint area A ₂ at conveyor 5 Thus, the paint sprayed from the respective coating nozzle heads 3y, 3c, 3m, and 3k can be applied to the surface of the building board 1 so that the building board 1 can be painted. The building board 1 coated in this way is transported by the transport conveyor 5, reaches the unloading area A ₃ , and is transported from the terminal end of the transport conveyor 5 to the next process.

The conveyor 5 is formed as a conveyor belt 5 a in which an endless belt 22 such as a timing belt is suspended between pulleys 23. Then, as shown in FIG. 5 (b), from the carry-in area A _{1 at} the front position where the building board 1 is introduced into the ink jet paint machine 2, the paint area A ₂ immediately below the ink jet paint machine 2, and the ink jet paint machine 2. If the unloading area a ₃ of the rear position deriving a building board 1 set up by conveyor belts 5a, respectively, to form a conveyor 5 lined with a plurality of conveyor belts 5a in series, the conveyor belt 5a of the loading area a ₁ from when the building board 1 possess the conveyor belt 5a painting area a _2, such as by fluttering of the building board 1, easily measured error detection and detection by the plate detecting sensor 6 and speed sensor 7 is generated, and a plurality of A plurality of motors for driving the pulleys 23 of the conveyor belts 5a are required, and a large amount of driving energy is required. In this invention, as shown in FIG. 5 (a), it is so as to form a conveyor 5 with a single belt conveyor 5a extending from loading area A ₁ to painting areas A ₂ and the unloading area A _3. By forming the conveyor 5 with the single belt conveyor 5a in this way, it is possible to smoothly transfer the building board 1 without being transferred, so detection / detection by the board detection sensor 6 and the speed sensor 7 is possible. Can be measured stably and accurately. Further, the number of motors for driving the pulley 23 of the conveyor belt 5a is reduced, and the driving energy is reduced.

It is a partial schematic diagram showing an example of an embodiment of the present invention. The schematic structure of a coating apparatus same as the above is shown, (a) is a front view, (b) is a plan view. It is the bottom view to which the coating nozzle head same as the above was expanded. It is the bottom view to which the single-piece head same as the above was expanded. The coating apparatus same as the above is shown, (a) and (b) are respectively schematic front views.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building board 2 Inkjet coating machine 3 Coating nozzle head 5 Conveyor 5a Belt conveyor 6 Board detection sensor 7 Speed sensor

Claims (3)

While feeding the building board in transport conveyor, by ejecting the coating material from the coating nozzle head of an ink jet sprayer, a painting apparatus of the building board which is adapted to coat the surface of the building board, wherein in the conveyor comprising a plate detecting sensor for detecting passage of said building board to be carried into the ink jet coating machine, and a speed sensor for detecting the speed of the building board to be sent by the conveyor in a non-contact, said plate detecting sensor than said speed sensor is located closer to the ink jet coater at a distance less than the length in the feed direction of the building board, the building board by detection with the speed sensor of the building board by the plate detecting sensor and characterized by comprising so as to control the timing of the start of injection of the coating material of the coating nozzle head on the basis of the speed Coating apparatus of that building board. The building board coating apparatus according to claim 1, wherein a Doppler type speed sensor is used as the speed sensor. Said conveyor, from a position for loading the building board to the ink jet coater, leading to a position for unloading the building board painted with the ink-jet coater, be made by forming with a single belt conveyor The building board coating apparatus according to claim 1 or 2, characterized in that.

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