Sewing – Work manipulating – Guides
Patent
1990-01-24
1991-07-23
Schroeder, Werner H.
Sewing
Work manipulating
Guides
112147, 112153, 112306, D05B 3502, D05B 3510
Patent
active
050333992
ABSTRACT:
An automatic fabric guide mechanism in a sewing machine includes at least one edge displacement detecting device including a common light source and a pair of light sensors juxtaposed to each other so as to receive rays of light from the common light source. The light source and the light sensors cooperate with each other to define a generally U-shaped channel for accommodating a free lateral edge of a fabric during the feed of the fabric past the stitching position. This detecting device is so designed and so operated as to detect the occurrence of a lateral swing of the fabric being sewed depending on whether both of the light sensors fail to receive the rays of light from the common light source or whether both of the light sensors receive the rays of the light from the common light source. The fabric guide mechanism also includes at least one control roller operable to compensate for the displacement of the fabric so that the stitching can be formed substantially exactly in alignment with an intended stitching line spaced a predetermined distance inwardly from the free lateral edge of the fabric.
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Miyachi Nobuji
Tujimoto Kenji
Hams Corporation
Lewis Paul C.
Schroeder Werner H.
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