Thread brake
AssigneeIro AB
InventorsMichele Melillo, Kurt A. G. Jacobsson
Life of this patent
Estimating the term…
Abstract
In a thread brake, which comprises at least one brake element (B) adapted to be moved relative to a counter brake element (B.sub.G), said brake elements acting on the thread in braking positions and being adapted to be displaced up to and into a threading position in which the thread can be moved undecelerated through the thread brake, and in the case of which a brake element adjustment device is provided, the threading position of the thread brake (F.sub.K, F.sub.L, F'.sub.L) can be established with the aid of a drive means (A) of said adjustment device, said thread brake having provided therein air guide surfaces (L), which, in the threading position, define an air guide passage used for automatic, pneumatic threading of the thread (Y) by means of a stream of air.
Claims26
In a thread brake having first and second brake members positioned transversely relative to the traveling direction of a thread, the first and second brake members being relatively moveable transversely with respect to the traveling direction between a braking position in brake members act on the thread and a threading position in which the thread can be moved freely through the brake in the thread traveling direction, the improvement comprising:
- drive means for relatively transversely displacing the first and second brake members into said threading position;
- automatic threading means for automatically and pneumatically threading a thread through the brake by a stream of air, said threading means including
- (a) guide surface means defining an elongate air guide passage extending through the thread brake in the thread traveling direction when the brake members are in said threading position, and
- (b) selectively actuatable pressure source means for supplying a stream of air to said passage to cause threading of the thread along the passage;
- and
- said drive means being coupled to a thread breakage detector and including means for automatically relatively displacing the first and second brake members into the threading position in the case of thread breakage, and means for activating the pressure source means.
In a thread brake system having a thread brake which includes first and second brake members positioned transversely relative to the traveling direction of a thread, the first and second brake members being relatively moveable transversely with respect to the traveling direction between a braking position in which the brake members act on the thread and a threading position in which the thread can be moved freely through the brake in the thread traveling direction, the improvement comprising:
- threading means for automatically and pneumatically threading a thread through the brake by a stream of air, said threading means including
- (a) guide surface means defining an elongate air guide passage extending through the thread brake in the thread traveling direction when the brake members are in said threading position, and
- (b) selectively actuatable pressure source means for supplying a stream of air to said passage to cause threading of the thread along the passage;
- thread breakage detector means for supplying a signal upon sensing a thread breakage;
- and
- drive means for relatively transversely displacing the first and second brake members into said threading position in response to the signal from the thread breakage detector means so that a thread is fed through the passage by the stream of air to automatically thread up the thread brake.
Dependencies are inferred from the claim text.