Electromagnetic bobbin thread supply alarm
US4180007A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1979 |
| Grant date | Dec 25, 1979 |
| Priority date | — |
| Expiry date | Jan 15, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05D2207/06
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A low bobbin thread supply alarm in which a bobbin case is fitted with lever pivoted thereon and carrying a permanent magnet for travel to the hub of the bobbin. An arm overhanging the bobbin case and bobbin carries a Hall generator in a portion thereof overlying the hub of the bobbin. The lever and permanent magnet carried thereby is urged by an electromagnet supported externally of the looptaker toward and away from the hub of the bobbin at suitable intervals. When the lever pivots greater than a given amount due to depletion of thread on the hub of the bobbin the permanent magnet on the lever will trigger a voltage change on the Hall generator which may cause an appropriate alarm to provide a warning of a low thread condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.