Method and apparatus for forming snarl-free thread reserves
US4552320A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1983 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Apr 4, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/31
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Snarls are formed at winding machines and the like when the thread tension is reduced. By reducing the angle .alpha. which the thread forms with the end surface or face of the delivery bobbin or spool the friction between the thread and the bobbin edge can be increased to such an extent that no thread coils or turns can disengage from the surface of the delivery bobbin and become snarled even when the thread tension decreases. The reduction in the angle .alpha. may be achieved by lowering a thread guide eye towards the delivery bobbin, by lifting the delivery bobbin or by deflecting the thread at an extension or protection provided at the bobbin. Upon deflecting the thread at the extension a thread reserve can be provided by applying thread turns at the extension in a direction opposite to the thread turns wound on the bobbin and which thread reserve can be eliminated in a simple manner by withdrawing the same as a whole or in sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.