| 摘要 |
The present invention provides a method using a non contact Z height laser scan sensor to measure/detect an object surface containing extruded shapes with different Z axis elevation heights to determine the position where to precisely inkjet print outline contours, legends, logo images, or solid fill with materials. The apparatus consist of a printing carriage, a supporting beam, a printing platen for the object to be placed and a control system. The said printing carriage is installed with print heads and a laser Z height scan sensor. The object with uneven Z height surface elevation features to be printed is placed on the printing platen. The said printing carriage with the laser Z height scan sensor will scan across the object on the X and Y axis to detect the exact target positions of the uneven Z height surface elevation contours on the object. The image processing program can then calculate a precise position to print a given image, or compute an image from the contour shapes to be printed on the object. The method can be featured with high degree of automation, easy control and accurate positioning, so as to improve the inkjet printing quality. |
| 主权项 |
1. A method of printing on elevation contours of the print object comprising:
a). An inkjet printing apparatus, including a printing carriage, a supporting beam, a printing platen for the object to be placed and a control system, wherein the said printing carriage is installed with print heads and a laser Z height scan sensor, and one or more objects with one or multiple uneven Z height surface elevation features are placed on the said printing platen; b). Pre-process given images to be printed on the uneven Z height surface elevation features of the print object; c). A laser Z height scan sensor to detect the uneven Z height surface elevation features of the print object by one or more scan pass on the X and Y axis; d). An image processing program to recognize the position of a reference point which is the center of each elevation contour relative to the printing platen; e). Matching position coordinate of the center of each elevation contour on the print object with the center of each pre-process given image and then putting together one or multiple pre-process given images that have the exact position coordinates to form a combined image to be printed; f). A control system controls the print heads to print the combined image composed by one or multiple pre-process given images on the object. |
