Controlled thread brake

Abstract

A controlled thread brake for braking a weft thread (10) in a weaving machine is presented which comprises a brake band (3) and a brake body (2), with the thread brake (1) additionally comprising an electromagnet (6) and a rotatable or rocking lever (4) which can be moved by means of the electromagnet. The lever (4) is connected to the brake band (3) so that a pulling force can be exerted in the longitudinal direction of the brake band by means of the electromagnet (6) in order to be able to press the latter against the brake body (2) for braking the weft thread.

Description

The invention will be explained in the following in more detail with reference to the exemplary embodiment and with reference to the drawings. Shown are:

FIG. 1 a perspective view of an exemplary embodiment of a thread brake in accordance with the present invention,

FIG. 2 a side view of the same exemplary embodiment,

FIG. 3A a side view of a second exemplary embodiment of a thread brake in accordance with the present invention during the braking, and

FIG. 3B a side view of the exemplary embodiment which is shown in FIG. 3A with released thread brake.

Claims

1. Controlled thread brake for braking a weft thread (10) in a weaving machine with a brake band (3) and a brake body (2), characterized in that the thread brake (1) includes an electromagnet (6, 6′) and a rotatable or rocking lever (4) which can be moved by means of the electromagnet and which is operationally connected to the brake band (3) in order to exert a pulling force in the longitudinal direction of the brake band and to place the latter against the brake body (2) for braking the weft thread.

2. Thread brake in accordance with claim 1, with the thread brake comprising two or more brake bodies (2) and/or with the brake body or bodies (2) being formed as a passive brake element.

3. Thread brake in accordance with claim 1, with the brake band (3) being firmly or elastically connected to a holder (8) at a first securing point, in particular at one end, and, spaced in the longitudinal direction, being firmly or elastically connected to the lever (4) at a second securing point, in particular at the other end.

4. Thread brake in accordance with claims 1, comprising a spring element for the release of the thread brake, in particular a tension or compression spring, which acts on the lever (4) and/or a leg spring at the point of rotation of the lever and/or a prestressed brake band (3).

5. Thread brake in accordance with claims 1, with the lever (4) being straight or angled, and/or with the lever (4) being arranged substantially at right angles to the brake band (3).

6. Thread brake in accordance with claims 1, with the point of rotation of the lever (4) being arranged between the brake band (3) and the electromagnet (6) and/or one-sidedly on the side of the brake band or of the electromagnet.

7. Thread brake in accordance with claims 1, with an armature (5) of the electromagnet (6, 6′) being provided at the lever (4), said armature containing a ferromagnetic or permanent magnetic material, and/or with the lever (4) or a part thereof being formed as an armature (5), and/or with the electromagnet (6, 6′) having a U-shaped core or being formed as a pot magnet and with the magnetic field passing through the armature (5).

8. Thread brake in accordance with claims 1, comprising at least one second electromagnet (6′) by means of which the lever (4) and/or the brake band (3) can be moved and which is provided as a release magnet and/or to assist the first electromagnet (6).

9. Thread brake in accordance with claims 1, with an air gap being provided between the armature (5) and the electromagnet or electromagnets (6, 6′) during the braking.

10. Weaving machine comprising at least one thread brake in accordance with claims 1.