Devices for determining the helix angle of twisted threads during false-twist texturing
US4148178A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1978 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Apr 11, 1998 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02G1/0266
- WIPO fieldMeasurement
- WIPO sectorInstruments
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.