Screen printing machine with oscillating stencil frame

Claim 1

A SCREEN PRINTING MACHINE COMPRISING A BASE HAVING A FIXED WORK-RECEIVING TABLE, A SCREEN-BEARING FRAME DISPOSED ABOVE SAID TABLE, MEANS FOR PIVOTALLY MOUNTING SAID SCREEN-BEARING FRAME IN ITS REARWARD PORTION FOR SWINGABLE MOVEMENT BETWEEN LOWERED, OPERATIVE POSITION AND ELEVATED INOPERATIVE POSITION, A SQUEEGEE-SUPPORT FRAME DISPOSED ABOVE SAID SCREEN-BEARING FRAME, SUPPORT ARMS INTEGRAL WITH THE REARWARD END OF SAID SQUEEGEE-SUPPORT FRAME AND EXTENDING PERPENDICULARLY DOWNWARDLY THEREFROM, MEANS PIVOTALLY MOUNTING SAID SUPPORT ARMS FOR SWINGABLE MOVEMENT OF SAID SQUEEGEE-SUPPORT FRAME BETWEEN ELEVATED AND LOWERED POSITIONS, MEANS CONNECTING SAID SCREEN-BEARING FRAME AND SAID SQUEEGEE-SUPPORT FRAME FOR JOINT SWINGABLE MOVEMENT, A SQUEEGEE CARRIER MOUNTED ON SAID SQUEEGEE FRAME FOR RECIPROCAL MOVEMENT FORWARDLY AND REARWARDLY THEREALONG, A PRIME MOVER MOUNTED ON SAID BASE REARWARDLY OF SAID SQUEEGEE-SUPPORT FRAME, A CRANK OPERATIVELY ENGAGED TO, AND DRIVEN BY, SAID PRIME MOVER, AND HAVING AN AXIS OF ROTATION PARALLEL TO THE PIVOT AXIS OF SAID SQUEEGEE-SUPPORT FRAME, SAID AXIS OF ROTATION OF SAID CRANK BEING ALIGNED WITH OR ABOVE THE PATH OF REARWARD MOVEMENT OF SAID SQUEEGEE CARRIER, A CAM FOLLOWER CARRIED ON SAID CRANK, A CAM MOUNTED ON ONE OF SAID SUPPORT ARMS ON PROJECTING PERPENDICULARLY REARWARDLY THEREFROM, SAID CAM HAVING AN UPWARDLY CURVED END PORTION EXTENDING BEYOND THE AXIS OF ROTATION OF SAID CRANK, SAID CAM BEING DISPOSED FOR ENGAGEMENT BY SAID CAM FOLLOWER FOR EFFECTING RECIPROCAL RAISING AND LOWERING OF SAID SQUEEGEE-SUPPORT FRAME TOGETHER WITH SAID SCREEN-BEARING FRAME, MEANS BIASING SAID SQUEEGEESUPPORT FRAME IN DOWNWARDLY SWUNG POSITION, AND MEANS DRIVE BY SAID CRANK FOR EFFECTING RECIPROCAL TRAVEL OF SAID SQUEEGEE CARRIER.