Sewing – Stitch forming – Zigzag
Patent
1992-12-07
1993-12-07
Nerbun, Peter
Sewing
Stitch forming
Zigzag
74 57, 74567, D05B 302, F16H 2514
Patent
active
052675211
ABSTRACT:
A pattern generator for use in a zig-zag sewing machine wherein a needle bar is moved back and forth in an oscillatory movement to produce zig-zag action as a consequence of rotation of an arm shaft. The shaft rotates at a constant angular velocity with the period of time required for one cycle of oscillatory movement of the needle bar being equal to the period of time for two successive complete revolutions of the shaft. The generator includes a rotatable cam connected to the shaft to rotate the cam at the same velocity as the arm. A slide block follower engages the cam. The block has raised, intermediate and lowered positions in the cam and moves smoothly between these positions as the cam is rotated. The follower is placed in the lowered position at the start of the first revolution and moves smoothly into the raised position upon completion of the first revolution which is coincident with the start of the second revolution, the follower then moving smoothly into the lowered position upon completion of the second revolution which is coincident with the start of the first revolution.
REFERENCES:
patent: 573881 (1896-12-01), Jagielski
patent: 776822 (1904-12-01), Abercrombie
patent: 1116679 (1914-11-01), Dashew
Nerbun Peter
The Singer Company NV
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