Zigzag control device for sewing machines
AssigneeThe Singer Company
InventorsReinhold Papajewski, Helmer Heinz Holl
Life of this patent
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Abstract
A control device for a zigzag sewing machine is disclosed in which the width of zigzagging and the neutral position of needle vibration may be separately influenced and in which for any given maximum width of zigzag stitching the extreme left and right hand neutral positions of needle vibration can always be made to coincide with the left and right hand sides of that maximum width of zigzag stitching.
Claims4
A zigzag control mechanism for a sewing machine having a needle bar supported for lateral zigzag movement, said zigzag control mechanism comprising a bight adjusting member (72) for controlling the width of zigzag stitching, a position adjusting member (62) for controlling neutral position within the range of zigzag movement at which straight stitches will be formed when the width of zigzag stitching is reduced to zero by the bight adjusting member, and a width limiting member (42) for limiting the width of zigzag stitching which may be set by said bight adjusting member (72) and for simultaneously effecting that adjustment of the position adjusting member (62) which will locate the neutral position of needle vibration at the extreme left and right hand edges of zigzag sewing regardless of the total width of zigzagging.
A zigzag control mechanism for a sewing machine of the type having a frame (11), needle bar carrying gate (12) shiftably supported on said frame for lateral zigzag movement and having a driven arm (15), a zigzag drive member (30) in said frame having a substantially constant throw, a motion transmitting connection (85) between said zigzag drive member and a pivot pin (86) on said driven arm, and a toggle device provided for regulating the transfer of motion from said zigzag drive member to said needle bar gate, said toggle device including an anchor link (80) or (81) pivoted at one extremity (82) with respect to said zigzag drive member and having at the other extremity a control pivot (78), (79) which may be selectively positioned into or out of coincidence with a line through the axis of said pivot pin (86) on said driven arm and perpendicular to said driven arm 15 of said needle bar carrying gate (12), the improvement which comprises three interconnected control members for regulating the disposition of said control pivot (78), (79) and including a width limiting member (42) pivoted to turn on an axis in said frame, a position adjusting member (62) pivotally supported on said width limiting member (42) at a point (61) spaced from the turning axis of said width limiting member which pivotal support (61) for said position adjusting member is movable into and out of coincidence with said line through the axis of the pivot pin on said driven arm and perpendicular to said driven arm of said needle bar carrying gate, and a bight adjusting member (72) pivotally supported at (70, 71) on said position adjusting member 62 and carrying said anchor link control pivot (78, 79,) and cooperating stop abutment means (99, 100) on said position and bight adjusting members for limiting the excursion of said bight adjusting member (72) from the zero bight position in direct proportion to the amount by which said pivotal support (61) for said position adjusting member is moved away from said line through the axis of the pivot pin on said driven arm and perpendicular to said driven arm of said needle bar carrying gate by turning movement of said width limiting member (42).
Dependencies are inferred from the claim text.