Method and device for automatically leveling fleeces, slivers, rovings and the like by drawing
US4137487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1976 |
| Grant date | Jan 30, 1979 |
| Priority date | — |
| Expiry date | Sep 27, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01H5/42
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for automatically leveling a band of fibers such as sliver, roving and the like by varying the drafting speed of a drafting mechanism responsive to variations in the thickness of the band. Analogue signals are produced by variations in the thickness of the band and are converted to digital signals for being stored in a digital register. After a period of time, corresponding with the time for conveyance of the scanned point in the sliver up to and into the draft zone, the information is read out of the storage register and converted back to an analogue signal. The analogue signal is compared with another signal representing the actual drafting speed for producing a compared signal for controlling the drafting speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.