US 4,535,956 AGranted

Thread braking mechanism

AssigneeMaschinenfabrik Benninger AG

InventorsEdwin Wildi, Erwin Bossart, Hans Hasler

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Abstract

In a housing, two rollers having substantially parallel axes are freely rotatably journaled and bound between them a clamping bite. The thread to be braked is drawn through the clamping bite and thereby drives the rollers. A first of the two rollers is stationarily mounted in the housing. The second roller comprises a cover made of a rubber-elastic material. This second roller is journaled in a pivotable forked lever which is under the action of an angle lever. The second roller can be pressed against the stationary first roller with an adjustable operating bias by means of the angle lever and a force accumulator constituted by a tension spring. Spring means of a rapid braking device constitute a compression spring supported by a braking rod which is axially displaceable between two end positions. The compression spring acts upon a spring bush carrying a nose member. In one of the two end positions of the braking rod the nose member extends with play beneath an arm of the angle lever. In another one of the two end positions of the braking rod the nose member additionally transmits to this arm of the angle lever the force of the compression spring in order to initiate a rapid braking action of the two rollers.

Claims9

Dependent claims

A thread braking mechanism for thread comprising:

a housing;
two rollers substantially axially parallel and freely rotatably journaled in said housing;
said two rollers defining therebetween a clamping bite through which extends a thread which causes said two rollers to rotate while said thread is drawn through said clamping bite;
said two rollers comprising a stationary first roller and a displaceable second roller;
a force accumulator operatively connected to said displaceable second roller such as to displace said displaceable second roller relative to said stationary first roller in a substantially axially parallel manner and to resiliently press with an adjustable operating bias said displaceable second roller against said stationary first roller;
a rapid braking device comprising an individual spring means operatively associated with said displaceable second roller in order to suddenly increase the force acting thereupon for a rapid-braking operation;
and
said spring means, in an operative state of said rapid-braking device, subjecting said displaceable second roller to a stopping force in order to suddenly increase the force acting thereupon and to rapidly brake said two rollers independently of the action of said force accumulator which generates said operating bias.

5 more elements

Dependencies are inferred from the claim text.