Strip winder

Details Strip winder Strip winder

2000-02-15

2001-09-04

Jillions, John M. (Department: 3653)

Winding, tensioning, or guiding

Convolute winding of material

With particular material connection to take-up

C242S542200, C242S547000

Reexamination Certificate

active

06283403

ABSTRACT:

The invention relates to a strip winder for winding hot or cold strip to a coil, comprising pressure rolls, deflection cups, and a feed shaft.
In such strip winders the pressure rolls are driven and positioned together with the deflection cups on pivot systems which are moved by hydraulic or pneumatic cylinders and are supported so as to be pivotable about a pivot point such that they are movable toward and away from the winder mandrel. The pressure rolls and deflection cups serve to guide the first windings of the strip to be wound about the winder mandrel and, in combination with expanding of the winder mandrel, provide the frictional connection between the strip and the winder mandrel, while subsequently the strip is wound under tension with the pressure rolls and deflection cups pivoted away. The pressure rolls also have the task to secure the outer winding at the end of the winding process.
The strip to be deflected by the deflection cups is forced into the curved contour of the deflection cup because of centrifugal forces and lateral power. This results in a frictional force which provides resistance to the transport movement of the strip. This frictional force, especially for thin strips because of their minimal buckle resistance, can cause the strip to buckle and get stuck between the winding mandrel and the deflection cups within the winder, thus forcing the winding process to be interrupted.
In order to overcome these disadvantages, JP 58 215 220 A and GB 867 086 A suggest to provide the deflection cups with channels having outlet openings in the cup area and to connect the channels to a medium supply system. This achieves that the strip to be wound can no longer be damaged within the area of the deflection cups. However, in the area of the feed shaft and of the pressure rolls, there is still the possibility of damage to the strip.
The invention therefore has the object to design a strip winder such that beginning of winding of a hot or cold strip onto the winder mandrel can be securely performed also at greater velocities and small thickness.
To this end, it is suggested that the pressure rolls are embodied as comb rolls, the outlet openings of the channels are aligned with the comb gaps of the comb rolls positioned downstream in the strip transport direction, and pressure medium is supplied via the comb gaps to the deflection cups positioned downstream in the strip transport direction.
For this purpose, it is suggested to provide the deflection cups with channels having outlet openings within the cup area and to connect the channels to a medium supply system.
The exiting medium provides a reduction of the frictional force between strip and cup during the deflection of the strip. It exerts forces onto the strip, whose components act in the direction of strip movement as well as toward the winder mandrel. Accordingly, the strip is guided onto the spreading winder mandrel. Moreover, the strip is forwardly transported by the driven pressure rolls against which it rests under frictional force so that breaking out of the strip is prevented. At the end of the winding process the outer winding of the coil is forced by the pressure rolls onto the coil wherein the pressure rolls are driven at a slightly lower velocity than the strip transport velocity and thus prevents flapping of the strip end about the coil.
The medium with which the channels of the deflection cups are to be supplied can be water or compressed air. When the medium supply is provided for multiple channels, it is sufficient to provide a flexible line extending thereto which can compensate for the pivot movement of the cups.
Moreover, it has been found to be advantageous when the pressure rolls are comb rolls, the outlet openings of the channels are aligned with the comb gaps of the comb rolls positioned downstream in the strip transport direction, and pressure medium is supplied via the comb gaps to the deflection cups positioned downstream in the strip transport direction.
In this way, the complete deflection cup arranged downstream is flooded with pressure medium so that the leading strip end, which is forced by centrifugal forces against the cups, is entrained and the strip is thus kept away from the deflection cups.
In order to ensure the safe transport of the incoming band within the winder, it is furthermore suggested to connect the shaft flap, and possibly also other parts of the winder feed shaft to the medium supply system and to allow the medium to flow through the openings in the guide surfaces onto the incoming strip to thereby reduce friction and to ensure safe transport.


REFERENCES:
patent: 3100605 (1963-08-01), Bond
patent: 4964587 (1990-10-01), Oki et al.
patent: 3708891 (1987-11-01), None
patent: 867086 (1961-05-01), None
patent: 2096973 (1982-10-01), None
Patent Abstracts of Japan, vol. 008, No. 064 (M-285), Mar. 27, 1984 & JP 8 215220 A (Kawasaki Seitetsu KK), Dec. 14, 1983.

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