Strip-withdrawal device for metal ribbons to be wound
AssigneeWalzmaschinenfabrik August Schmitz GmbH
InventorsHans Kaster, Klaus Bosenberg
Life of this patent
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Abstract
A strip-withdrawal device for producing back tension in a plurality of metal ribbons to be wound, with at least one travelling-wave linear motor for producing the back tension, the linear motor being subject to preliminary bending against the bending forces occurring during operation, which preliminary bending is desired during operation, so that the gap between the linear motor and the plane of the strip remains of equal size over the width and thus also the braking forces acting on each ribbon.
Claims11
A strip withdrawal device for producing back tension in a plurality of metal ribbon strips to be wound comprising:
- (a) at least one travelling wave, electric linear motor means for forming an air gap for the passage of strips to be braked and generating a magnetic field of adequate strength within the air gap to produce eddy currents in the strips which react with the magnetic field to brake the strips;
- (b) said motor means being disposed above and across the width of the air gap;
- and
- (c) means for bending said motor means so that said motor assumes a concave contour which, seen in the direction of travel of the strips, provides greater spacing from the strips passing through the center of the air gap than at the edges of the air gap;
- the contour being preset such that, during the operation of said device, the contour approaches a straight line.
A method for producing back tension in a plurality of metal ribbon strips to be wound, the method comprising the steps of:
- (1) forming an air gap with at least one travelling wave electric motor for the passage of strips to be braked, said motor generating a magnetic field of adequate strength to produce eddy currents in the strips which react with the magnetic field to brake the strips;
- and
- (2) bending the motor to assume a concave contour which, seen in the direction of travel of the strips, provides greater spacing from the strips passing through the center of the air gap than at the edges of the air gap, presetting the contour so that the contour approaches a straight line during operation.
Dependencies are inferred from the claim text.