Sewing – Special machines – Darning
Patent
1975-06-25
1977-07-19
Schroeder, Werner H.
Sewing
Special machines
Darning
112153, D05B 2100, D05B 3510
Patent
active
040361551
ABSTRACT:
An apparatus for guiding work past a sewing machine needle along a predetermined path to form a line of stitching corresponding to the path with deviations of the work from a normal feed path to the needle being sensed and causing a pivotal movement of the work about the needle to overcome the deviation. The ability of the apparatus to correct the deviation is related to the speed of sewing and to maintain this sewing speed within the deviation correcting ability there are fast and slow sewing speeds and sensing means that senses the occurrence of a large deviation and decreases the sewing speed to the slow speed to enable the apparatus to correct the deviation. For sewing a line of stitching a preselected distance from the edge of a workpiece, the vertical axis on which the work is pivoted is slightly tilted so that the workpiece is positioned to have the portion of its edge at the needle normally extend transversely beyond the needle a distance greater than the preselected distance from the needle. The edge of the workpiece engages the guide and is forced to be the preselected transverse distance from the needle. The apparatus utilizes a method when the work is two plies of cloth that are to be sewed together of holding the plies at a plurality of spaced points and feeding it at a determined rate while the feed dogs of the sewing machine are set to advance the cloth at a faster rate. The presser foot is made to exert only a light pressure on the cloth to permit slippage therebetween in order to minimize relative shifting and stretching of the two plies as they are sewn together with stitches having a stitch length determined by the rate of the apparatus.
REFERENCES:
patent: 51547 (1965-12-01), Brown
patent: 1488334 (1924-03-01), Frey
patent: 2142476 (1939-01-01), McDonald
patent: 2672833 (1954-03-01), Ritter
Nerbun Peter
Schroeder Werner H.
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