Patent ID: 6817288
Filing Date: 2004-11-16
Classification: B41F

Abstract:
A screen-printing apparatus, comprising:a platen for supporting a workpiece; and at least one print head having a frame clamp removably mounted to the at least one print head, a print screen frame removably attached to the frame clamp, the frame clamp having a reciprocating clamp portion and a stationary clamp portion, the reciprocating clamp portion and the stationary clamp portion cooperatively engaging the frame; at least one pneumatic cylinder mounted to the stationary clamp portion, the cylinder having a piston and a piston rod, the piston rod having two opposing ends, one end of the piston rod being connected to the piston, the opposite end of the piston rod being connected to the reciprocating clamp portion, the piston and connected piston rod being movable inside the cylinder, the piston defining two chambers inside the cylinder; adjusting means for horizontally and vertically aligning the frame clamp on the print head; a two position valve having an inlet port, a first outlet port, a second outlet port, and a single direction throw with pinned lever; an air distribution system connecting the first and second outlet ports of the valve to the first and second chambers, respectively of the at least one pneumatic cylinder; and a main air supply system for distributing air to the valve, the main air supply adapted for receiving a supply of pressurized air from a source in an amount sufficient to activate the at least one pneumatic cylinder; whereby the piston rod is operative to cooperatively engage the frame between the reciprocating portion of the clamp and the stationary portion of the clamp, thereby securing the frame to the print head.