Needle bar drive stabilizing arrangement
AssigneeThe Singer Company
InventorHeinrich Ciecior
Life of this patent
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Abstract
A drive mechanism for reciprocating a sewing machine needle bar endwise from an actuating crank is disclosed in which the lateral stud on the needle bar to which the drive link is connected is fitted with a ball bearing slidably constrained in a guide slot formed parallel to the path of needle reciprocation in a stationary guide frame. The forces and reactions occasioned by alternate acceleration and decelleration during each needle bar stroke will cause the outer race of the ball bearing to engage first one side then the opposite side of the guide slot during each stroke thus turning the bearing in opposite directions and distributing the wear.
Claims1
A needle bar drive stabilizing arrangement for the needle bar reciprocating mechanism of a sewing machine having a frame, a drive shaft journalled in said frame and carrying a crank pin, a needle carrying bar endwise reciprocally mounted in bearings in the frame and having a lateral drive stud secured thereon, and a connecting link having at one extremity a hub embracing the crank pin and at the other extremity a hub embracing the drive stud which is secured on the needle bar, and a guide member fastened to the machine frame and formed with a guide slot having sidewalls parallel to the needle carrying bar one at each side of the drive stud, characterized by this that a cylindrical antifriction bearing is provided of which the inner bearing race is fitted on the drive stud and the outer bearing race is arranged with clearance between the guide slot sidewalls so that during each stroke of the needle bar the outer bearing race will be urged into rolling contact with one guide slot sidewall during acceleration of the needle bar and into rolling contact with the opposite guide slot sidewall during deceleration of the needle bar.
Dependencies are inferred from the claim text.