$1)$ In the position shown, as slide bar E pulls to the left, what is the motion of link D$?$

$2)$ In the position shown, as slide bar E pulls to the left, what is the motion of slide block I?

$3)$ Pulley J is keyed to shaft A$.$ As pulley J rotates, what is the motion of crank pin C$?$

$4)$ As pulley J rotates, what is the motion of slide bar E$?$

$5)$ What effect does moving slide bar E to the left have on crank pin C and on the motion of the slider$-$crank mechanism it drives?

$6)$ Sleeve F is keyed to the housing H$.$ As pulley J drives shaft A$,$ what is the motion of sleeve F$?$

$7)$ Sleeve J is integrally molded with item G$.$ What is item G$?$

$8)$ Sleeve J has internal threads at its right end, and sleeve F has external threads at its right end. As item G rotates, what happens to sleeve F$?$

$9)$ As item G rotates, what happens to slide bar E$?$

$10)$ What is the purpose of this mechanism and how does it operate?