SCREEN PRINTER HAVING STRUCTURE FOR SOLDER AMOUNT ESTIMATION

摘要

A photoelectric sensor 60 and squeegees 32 and 42 are fixed to a slider, when outward movement printing in which solder on a screen S is rolled by an outward movement of the right squeegee 32 is completed, the right squeegee 32 is separated from a state of contacting a right end R1 of a solder roll and a squeegee position p1 at that time is input, and, subsequently, the slider is returned until the photoelectric sensor 60 detects a left end R2 of the solder roll and a squeegee position p2 at this time is input. An amount (a solder roll width R) of solder remaining on the screen S is calculated by subtracting a movement amount S from the squeegee position p1 to the squeegee position p2 from a distance X from the right squeegee 32 to an optical axis position of the photoelectric sensor 60 on the screen S.

主权项

1. A screen printer which performs printing by moving solder which is placed on a screen using a squeegee, the screen printer comprising:
a head, on which the squeegee is mounted; parallel movement means for causing the head and the screen to move relatively in a direction parallel to the screen; perpendicular movement means for causing the head and the screen to move relatively in a direction perpendicular to the screen; position detection means for detecting a relative position between the squeegee and the screen; optical detection means which is provided such that an optical axis position is capable of moving relative to the screen due to the parallel movement means, and which is for detecting the screen and the solder at the optical axis position in an identifiable manner; printing completion time control means for, when printing is completed, controlling the perpendicular movement means such that the squeegee and the screen move relatively in a direction perpendicular to the screen to a position at which the squeegee is at least separated from a state of being in contact with one end side of the solder in a printing direction, and, after the controlling is performed, controlling the parallel movement means such that the head and the screen move relatively in a direction parallel to the screen until at least another end side of the solder in the printing direction is detected by the optical detection means; and solder amount estimation means for estimating an amount of solder on the screen based on the relative position between the squeegee and the screen which is detected by the position detection means when the printing is completed, and the relative position between the squeegee and the screen which is detected by the position detection means when the other end of the solder in the printing direction is detected by the optical detection means.