Method of levelling out variations of a fibre sliver and apparatus for implementing the method
US4369550A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1981 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Mar 16, 2001 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01H5/42
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An autolevelling drawframe for levelling out staple fibre slivers in the spinning mill operation, in which deviations of the sliver weight (linear density) from the preset desired value detected are processed into correcting signals and are transmitted to a correcting member, which adapts the input speed of the drafting arrangement. The correcting signal transmitted is generated from the product of a voltage proportional to the rotational speed of the main motor and a voltage determined by the deviation in linear density. The apparatus consists of a computer (34,41; 60,41; 67,71) for computing the correcting signal, which computer is connected electrically with the correcting member (48), with a transducer (20) transmitting the voltage proportional to the rotational speed of the main motor, and with means for generating the voltage determined by the deviation in linear density. The computer can consist of a control device (36) and a multiplicator (41) or of a microprocessor (71) (digital computer).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.