said thread needle laterally during its forward and rearward movements into loops of fabric to correspond with the movement of the subjacent impaling pins."
Claim 13 in suit reads directly upon the defendant's machine except as to that element "of a driving shaft provided with a laterally movable connecting member adapted to reciprocate said thread needle." In providing the connecting member between the eccentric of the driving shaft and the rocker arm or support for the thread needle, and to permit of the slight lateral movement of the thread needle in registry with the impaling pins, the complainant made use of the common mechanical expedient of universal joints or ball and socket bearings at each end of the connecting member. The claim thus describes the preferred embodiment of aconnecting member which is in fact laterally movable. In the defendant's machine a reciprocating connecting member is provided without the universal joint or ball and socket bearings at each end, but with a bearing at the end adjacent the thread needle, slidably embracing a pin upon the needle support. While the needle support is rocked by the reciprocating motion of the connecting member and given lateral movement by a cam, the connecting member itself has no lateral movement, but the pin slides in its bearing and thus permits the reciprocating motion to be transmitted to the needle support during its lateral movement in much the same way as by the use of the universal joints. It is urged that the defendant's connecting member nevertheless has lateral movement in