Vertical axis hook for lockstitch sewing machine, with screw-adjustable needle guard plate

摘要

A vertical axis hook (10) for a lockstitch sewing machine comprises a hook body (11) with a hook point and a peripheral needle guard plate (12) mounted on the hook body, the plate comprising a fastening and positioning portion and an adjustable portion integral with each other. It further comprises a plate adjustment means to adjust the radial position of the adjustable portion with respect to the hook point. The plate adjustment and positioning means (16) acts in a position of the adjustable portion of the plate which is near the fastening portion thereof.