Patent ID: 7337718

Claim:
A two-bar linkage fast elevating apparatus for screen printing machine, said screen printing machine including a platform, a printing bed, and a transverse slide base; said transverse slide base having a cantilevered printing head forward extended therefrom to leftward and rightward slide along said transverse slide base, and being provided at two lateral ends thereof with two forward extended cantilevered arms, each of said two cantilevered arms being provided at a lower side with a clamping support for holding a screen frame between said two cantilevered arms; said two-bar linkage fast elevating apparatus comprising a two-bar linkage system and an eccentric shaft driving system, both of which are connected to a rear side of said transverse slide base; said two-bar linkage system including a seat having a support upward extended from each lateral side thereof; two fixing plates symmetrically assembled to predetermined positions on inner wall surfaces of said two supports; two upper and two lower connecting bars, each of which has a first and a second end; an upper and a lower connecting shaft extended between said two fixing plates with two ends extended through said first end of said upper and lower connecting bars, respectively, into upper and lower ends, respectively, of said two fixing plates; and a link bar extended between said two upper connecting bars with two ends extended through two upper shaft holes separately provided at rear portions of two connecting blocks and then into said second end of said two upper connecting bars; and said two lower connecting bars being connected at said second end to two lower shaft holes separately provided at the rear portion of said two connecting blocks; and said eccentric shaft driving system including a rod bearing located at an upper end of said eccentric shaft driving system; a force applying rod assembled to said rod bearing; two fixing members fixedly connected to two ends of said force applying rod; a transmission block fixedly connected to a front side of said two fixing members; and a pivoting support located at a lower end of said eccentric shaft driving system.