Devices for determining the helix angle of twisted threads durin

Details Devices for determining the helix angle of twisted threads durin Devices for determining the helix angle of twisted threads durin

1978-04-11

1979-04-10

Petrakes, John

Textiles: spinning, twisting, and twining

Apparatus and processes

Monitor and control

57284, 73160, D02G 102, G01N 3336, G01L 506

Patent

active

041481780

ABSTRACT:
Devices are described for determining the helix angle of twisted threads during false-twist texturing. The thread passes over a convex spherical surface at the top of a two-armed lever pivoted between the arms and having a vertical zero position. Magnetic means act on the lower arm to bias the lever to the zero position. In one device the lever is pivoted about a diameter of a vertical cylindrical tube rotatable on a second vertical tube, a scale being provided to indicate the position of the tube about its axis which, in turn, depends on the helix angle of the thread traversing the spherical surface, which has a radius of curvature equivalent to the length of the upper lever arm. In another device the two-armed lever is carried by a ball in a spherical bearing and has a pointer at the lower end that indicates the position of the lever with respect to polar co-ordinates on a flat surface. The lower arm may be arranged selectively to cover photo-electric devices connected to maintain the twist density of the thread at processing positions of a friction texturing machine operating on the false-twist texturing principle. The magnetic biasing may be effected by permanent magnets or for greater sensitivity by an electro-magnet fed with discrete pulsations.

REFERENCES:
patent: 2715382 (1955-08-01), Kreamer
patent: 3405556 (1968-10-01), Gonsalves et al.
patent: 3613347 (1971-10-01), Carruthers
patent: 3667292 (1972-06-01), Hada
patent: 3705487 (1972-12-01), Carruthers
patent: 4015414 (1977-04-01), Sholly, Jr.

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