Abstract: The basic module comprises a frame, a support which is mounted to reciprocate vertically on the frame adjacent the rear thereof, and a printing screen, which projects horizontally forwardly from the support in cantilever fashion. A cable, which is attached at one end to the support and at its opposite end to the frame, passes intermediate its ends over a plurality of pulleys, certain of which are mounted on the frame, and one of which is attached to a counterweight located beneath the frame. The weight is carried on one end of a pivotal treadle, the opposite end of which is adapted to be manipulated by the foot of an operator standing in front of the frame. Normally the weight is in a lowered position in which it causes the cable to retain the screen in an elevated position, but when the foot treadle is depressed, the weight is lifted and the screen and its support drop by gravity to their lowered positions.