Device for determining adjustment values for the pre-draft of a sliver
US6640154B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 2002 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Dec 16, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01H13/32
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A device is provided for determining and optimizing a pre-draft value on a draw unit for slivers. The draw unit has a feed roll pair, a center roll pair and a delivery roll pair, a pre-draft zone between the feed roll pair and the center roll pair, and a main draft zone between the center roll pair and the delivery roll pair. The device has a center roll drive motor for driving a lower roll of the center roll pair, a sensor for measuring values of a variable indicative of draft forces at the center roll drive motor, and means for controlling the drive motor in accordance with a function defining a relationship between the measured value and the pre-draft value. The function indicates an optimum region having at least one of an increase end point and an increase end region, the optimum region providing a parameter that is usable for optimizing the pre-draft value for the draw unit. A speed of the center roll drive motor is controlled to adjust a ratio of circumferential speeds of the center roll pair to the feed roll pair in order to change the pre-draft value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.