Sewing – Special machines – Buttonhole
Patent
1974-09-24
1977-08-16
Hunter, H. Hampton
Sewing
Special machines
Buttonhole
112206, 112410, 112266, D05C 1512
Patent
active
040418847
ABSTRACT:
Apparatus for making a seam from two threads, each thread being formed into bridging loops and prone loops, each prone loop of one thread embracing a double portion between two bridging loops of the other thread, such doubled portions forming the prone loops. The apparatus has opposed sewing-machine-type needles which move together and apart, crossing a reference plane between the needles in a pattern whereby a loop between the eye of one needle and the previously made seam, is penetrated when the first needle starts to retreat from its furthermost excursion past the reference plane, by the other needle during its approach to the reference plane. The needles of a pair are slightly staggered laterally so that they pass one another, preferably with light contact, during loop penetration.
The example relates to a seam which is made upon a base fabric and in which the bridging loops of both threads are held slack to form pile loops by means of loopers.
The mechanism for actuating each needle of a pair comprises a combination of eccentrics and links which imparts to the needle a secondary motion along the line of the reference plane as well as towards and through that plane. This permits continuous motion of the base fabric which is in any event essential in the apparatus shown, because there is always at least one needle of the pair penetrating the base fabric. The needles of a pair are slanted in relation to one another and to the reference plane, in a plane normal to the reference plane and containing the line in which the seam extends.
A number of pairs of needles are mounted on a pair of needle bars operated by the needle-actuating mechanism which includes thread draw-off and feed mechanisms, for both threads.
Rolls and guides are provided for supporting a supply of base fabric and advancing it to pass along the reference plane where it passes between the needles.
REFERENCES:
patent: 10354 (1853-12-01), Blodgett
patent: 3361096 (1968-01-01), Watkins
Ward Gerald Frank
Wray Gordon Richard
Hunter H. Hampton
National Research Development Corporation
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