Sewing machine having auxiliary work turning needle
AssigneePfaff Industriemaschinen GmbH
InventorsDieter Balzer, Walter Hager
Life of this patent
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Abstract
An auxiliary needle is supported by a shiftable and rotatable slide rod which extends in a slightly inclined position relative to the vertical and is guided by an extension in a guide slot. The upper portion of the guide slot extends at an angle relative to the slide rod. Therefore, if moved from its rest position downwardly into its working position, the auxiliary needle performs first a combined rotary and translational motion, and then, upon penetrating a workpiece, only a straight longitudinal motion.
Claims5
A device for use with a sewing machine having at least one stitching needle which reciprocates into a workpiece that is fed over a support to form stitches, comprising an auxiliary needle having a point, a slide rod connected to said auxiliary needle and having a longitudinal axis which is offset from said point, a bushing mounted at a fixed location with respect to the sewing machine, said bushing carrying said slide rod for longitudinal movement parallel to its axis and for rotation about its axis, drive means operatively connected to said slide rod for moving said slide rod and guide means engaged with said slide rod for guiding movement of said slide rod through a path having a first portion effecting rotation of said slide rod about its axis, and a second portion for effecting only longitudinal movement of said guide rod along its axis, said rotation of said guide rod causing pivotal displacement of said auxiliary needle point to a penetration location whereby movement of said slide rod in said second portion of said path causes penetration of said point into the workpiece.
Dependencies are inferred from the claim text.