Sewing – Special machines – Darning
Patent
1992-06-02
1993-05-25
Crowder, Clifford D.
Sewing
Special machines
Darning
112130, 112272, 112275, 112277, D05B 1900, D05B 3704
Patent
active
052130525
ABSTRACT:
A sewing machine is provided with an adjusting device for hem projection length sensors that can be moved relative to a cutting device, wherein the first hem projection length sensor is provided for sending a signal that brings about a cutting process for the front hem projection length, and the second of the sensors is provided for sending a signal that brings about a cutting process for the rear hem projection length. The length of the respective hem projection length and the width of an associated seamless fabric edge shall be able to be set depending on each other with minimum operator effort by the adjusting device both at the beginning and the end of the fabric. The adjusting device has a stop that is movable in the direction of feed for the front edge of the fabric for presetting the width of a seamless front fabric edge. The distance from the stitch formation site can be used to preset the position of the hem projection length sensor, and which serves to dimension a seamless rear fabric edge adjoining the end of the seam. A residual seam length is determined from the difference between the fabric end length and the width of the seamless front edge of the fabric. A control is provided for stopping the needle bar in its top reversal position when this residual seam length is reached. A measuring device for measuring the feed distances of the fabric can be activated by a signal of a sensor which is arranged in front of the stitch formation site and indicates the fact that the actual fabric end length drops below a predeterminable fabric end length.
REFERENCES:
patent: 3329113 (1967-07-01), Lewis
patent: 4112860 (1978-09-01), Ellington et al.
patent: 4276837 (1981-07-01), Biermann
patent: 4569297 (1986-02-01), Dusch
patent: 4895088 (1990-01-01), Pirrello et al.
patent: 5146860 (1992-09-01), Niwa et al.
Crowder Clifford D.
G. M. Pfaff Aktiengesellschaft
Lewis Paul C.
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