Patent ID: 9050790
Filing Date: 2015-06-09
Classification: B41F,B41P,H05K

Abstract:
1. A printing apparatus comprising: a mask formed with a pattern hole for printing; a printing mechanism having a squeegee that comes into contact with a front surface of the mask at a predetermined contact angle and a printing head that holds the squeegee, the printing mechanism reciprocally moving the squeegee with the movement of the printing head, and causing the squeegee to slide on the front surface of the mask with a predetermined printing pressure to move a solder on the front surface of the mask while scraping the solder by the squeegee, both in the forward and backward movements of the squeegee, thereby printing the solder to a substrate via the pattern hole; a detection device having a sensor attached to the printing head and executing detection operation for detecting a width or a height of solder on the front surface of the mask by sensing the solder on the front surface of the mask by the sensor; and a control unit controlling the printing mechanism, wherein the squeegee is turnably and vertically movably attached to the printing head so as to scrape off the solder using the same work surface both in the forward and the backward movement, the control unit includes: a program storage unit storing a program which executes operations in the order of a forward printing for performing printing on the substrate by moving the squeegee in a forward direction, a squeegee reverse operation for raising the squeegee to retract the squeegee after the forward printing so that the work surface of the squeegee is oriented in a backward direction, and in this state, the printing head is moved in the forward direction and the detection operation is performed by the detection device during the movement, and a backward printing for performing printing on the substrate by moving the squeegee in the backward direction; a printing condition storage unit storing at least one of the contact angle and the printing pressure as a printing condition; a printing control unit controlling the printing mechanism on the basis of the program stored in the program storage unit and the printing condition stored in the printing condition storage unit; and an arithmetic processing unit obtaining the printing condition on the basis of the width or height of the solder detected by the detection operation, the printing control unit adjusts a printing condition at the time of the backward printing on the basis of the printing condition obtained by the arithmetic processing unit; and the printing condition storage unit updates and stores the printing condition obtained by the arithmetic processing unit.