Sewing – Stitch forming – Multiple machines
Patent
1976-04-01
1977-03-22
Larkin, G. V.
Sewing
Stitch forming
Multiple machines
112 3R, D05B 2500
Patent
active
040130274
ABSTRACT:
This serging machine uses a righthand serging sewing head for serging one edge of an elongate strip of material and another, preferably identical, righthand serging sewing head for serging the opposite edge of that same strip comtemporaneously. This is accomplished by directing the strip material from a front supply roll rearwardly through the machine along one run of a given path, turning the strip 180.degree. at the rear end of the machine to return it forwardly through the serging machine and its feed rolls along another generally parallel run of said path and then rewinding it on a front rewind roll at the front end of said path. One edge is serged during the rearward run; the other during the forward run. First and second motors are used to drive the serging sewing heads continuously. A third motor is used not only to drive the feed rolls continuously to pull the strip through the machine but also to drive the rewind roll through a slip clutch. A fourth motor is used to drive the supply roll intermittently in a manner such that, when the slack between the supply roll and the 1st head reduces to a predetermined minimum so as to tend to tighten and stretch the rearward run, a switch starts the fourth motor to increase the slack until another switch operates to stop the fourth motor when said slack increases to a predetermined maximum degree of looseness.
REFERENCES:
patent: 3749037 (1973-07-01), Cash
patent: 3799082 (1974-03-01), Redman
patent: 3808993 (1974-05-01), Heiler et al.
James Cash Machine Co.
Larkin G. V.
Robert Arthur F.
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