Thread monitoring switch for textile machines having magnet biasing lever to prevent any annoying thread flutter
AssigneeEvolution SA
InventorGerhard Kempf
Life of this patent
Estimating the term…
Abstract
A filament supplied to a textile machine is held under tension by a thread mounted on a weighted or otherwise biased lever which trips a switch to arrest the machine upon rupture of the filament. In normal operation, the lever is held against a stop by the tension of the thread supplemented by the force of a magnet whose attraction diminishes rapidly over the swing range of the lever, the biasing force slightly exceeding the magnetic force in the normal lever position to prevent oscillations in response to minor fluctuations in filament tension but to initiate a rapid cutoff in the event of a break.
Claims10
A device for monitoring the passage of a filament to a machine, comprising:
- a fixed support;
- a movable member mounted on said support and provided with thread-guiding means thread-guiding means for holding said filament under tension;
- stop means on said support defining a normal position for said member;
- switch means on said support operable by said member in an off-normal position thereof to arrest said machine upon rupture of said filament;
- biasing means tending to displace said member from said normal position to said off-normal position agains the tension of said filament;
- and
- magnetic means disposed in part on said member and in part on said support for exerting upon said member a retaining force supplementing the tension of said filament in opposing said biasing means, said retaining force being less than the force of said biasing means in said normal position and diminishing to substantially zero within the range of displacement of said member for rapid operation of said switch means by said member in the event of filament rupture.
Dependencies are inferred from the claim text.