Sliding member 1 can slide along axis x-x in box-shaped guide 2. Screw a, fastened to sliding member 1, slides along slot b in guide 2. Sliding member 1 is spring-loaded by spring 3. Box-shaped guide 2 can slide on flat surface 4 along rectangular rod 5. With respect to each other, links 1 and 2 accomplish a single translational motion along the common axis x-x.
$30$EM,KP$