Sewing – Elements – Tensioning
Patent
1977-10-31
1979-02-27
Krizmanich, George H.
Sewing
Elements
Tensioning
D05B 4700
Patent
active
041413067
ABSTRACT:
This disclosure relates to thread tensioning apparatus for sewing machines of the type disclosed in U.S. Pat. No. 3,667,414, issued June 6, 1972, and in particular has for its purpose a simplification of such a mechanism by providing a novel tension transmission means including a leaf spring for transmitting spring pressure to the thread tensioning discs of said mechanism, an adjustable abutment means positioned against one side of said spring means provides for presetting the initial minimum tension on the leaf and a slidable fulcrum member bearing against the other side of said spring member is adjustable for varying the pressure exerted on the discs. The relationship of fulcrum positions, which may be adjusted by means of a dial or the like, with respect to resulting tension applied to the thread may be caused to occur in an advantageous non-linear manner by choice if the proper contour of the leaf spring. For purposes of this invention the contour of the leaf spring in width, thickness, or free state curvature may be varied to obtain the non-linear response.
REFERENCES:
patent: 2609772 (1952-09-01), Casas-Robert
patent: 2760458 (1956-08-01), Ayres
patent: 3366083 (1968-01-01), Ketterer et al.
patent: 3557731 (1971-01-01), Casas-Robert
patent: 3667414 (1972-06-01), Illes et al.
Bell Edward L.
Ebs William V.
Krizmanich George H.
Smith Robert E.
The Singer Company
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