Ink-jet application apparatus and method
A film paid out from a feed side film roll is conveyed so that an application target area of the film is located on a suction table in an application portion. Image-capturing cameras are disposed so as to be adjacent to ink-jet application heads so that one application head and one image-capturing camera are integrated with each other in terms of position of installation to form one application head unit portion. Each application head unit portion is moved above the suction table by a three-dimensionally movable XYZ-direction driving unit. A position where application will be performed next is image-captured by each of the image-capturing cameras in advance during the applying operation due to each of the application heads. A result of image capturing by each of the image-capturing cameras is processed by an image processing unit.
1. An ink-jet application apparatus comprising:
an upstream side guide roller which pays out and conveys a roll-like film;
a suction table which adsorptively holds the paid-out film;
an application head which applies a liquid coating material on the film adsorptively held by the suction table; and
a downstream side guide roller which conveys the film coated with the coating material and winds up the film like a roll, wherein:
an image-capturing camera for capturing an application target area is disposed so as to be adjacent to the application head and integrated with the application head in terms of position of installation to thereby form an application head unit portion;
the application head unit portion is moved above the suction table by a three-dimensionally movable XYZ-direction driving unit; and
control means for operating the ink-jet application apparatus such that firstly, the image-capturing camera moves in a direction orthogonal to a conveying direction of the film and captures an image of an application target area on the film only once initially in a series of operations, and before the application head moves to an application start position of the application target area, the image captured by the image-capturing camera is processed to calculate a correction value at application time based on a displacement quantity from a visual field center of the image-capturing camera, and thereafter the correction value is reflected on a position where the coating material should be applied originally and the application head is moved thereto;
next, the image-capturing camera moves in advance and captures an image of a position where the coating material will be applied next at a same time of an applying operation of the application target area due to the application head that is arranged in the position where the coating material should be applied originally; and
while the application head moves to an application target area where the coating material will be applied next, a result of image-capturing due to the image-capturing camera is processed by an image processing unit to thereby correct a displacement quantity from an originally set application position and a processing operation of moving the application head to the position where the coating material will be applied next and on which a correction value is reflected is performed and repeated in accordance with each application target area.
2. An ink-jet application apparatus according to claim 1 , wherein:
a plurality of application head unit portions each having the same configuration as defined above are provided; and
the XYZ-direction driving unit is formed so that the application head unit portions can operate integrally in a Y-axis direction as a width direction of the film but the application head unit portions can move individually in an X-axis direction as a length direction of the film and in a Z-axis direction as a height direction of the film.
3. An ink-jet application apparatus according to claim 1 or 2 , wherein:
alignment marks are provided in the application position of the film;
the alignment marks are image-captured by the image-capturing camera in a state where the paid-out film is adsorptively held; and
a positional displacement quantity due to adsorptive holding of the film is corrected so that the application head is moved to the position where the coating material will be applied next.
4. An ink-jet application apparatus according to claim 1 or 2 , wherein the application position whose image is captured by the image capturing camera in advance is shaped like striped grooves in section.