Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Reexamination Certificate
1999-01-29
2001-01-09
Nguyen, John Q. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
C242S541600, C242S547000
Reexamination Certificate
active
06170777
ABSTRACT:
The invention pertains to a load roll arrangement of the type corresponding to the preamble of claim
1
.
Such a load roll arrangement can be found in DE 21 47 673 A1. The support drums, in the manner typical of two-drum winding arrangements, have the same diameter and are arranged side by side at the same height in such a way that a winding core, placed from above into the winding bed, formed by the gap between the two support drums, cannot fall between the support drums. The placement of the winding cores is carried out manually or with a suitable device. The paper web comes from a roll cutting machine in which the web, having the width of the paper machine, is divided into more narrow lengths, as is customary, for example, in newspaper printing or other uses. The winding cores are as long as the individual partial webs are wide. They are placed into the winding bed while successively butting against each other and form a so-called winding core set. The beginnings of the partial webs are glued to the winding cores, whereupon the support drums begin to move and the winding cores, onto which the individual windings are wound, begin to turn. The winding cores or the wound roll are pressed down into the winding bed by means of an arrangement of load rolls in order to ensure, particularly during the initial phase, a good engagement of the wound rolls that are forming and in the later phase, a perfect formation of the wound rolls.
The load roll arrangement consists of many individual rolls succesively arranged in transverse direction with respect to the web, which rolls are pivotably mounted on arms and rest on top of the wound rolls independently of each other. In this way, a uniform resting on all wound rolls or a deliberately uneven resting can be achieved.
The arms of the load rolls are arranged at a support beam, provided centrally above the support drums, which can be raised and lowered vertically and which, in the initial phase, is lowered closely above the support drums and rises with an increasing wound roll diameter.
Not too long ago, it was customary for the winding cores of a set to have the same diameter. Lately, however, it is required that within a winding core set, winding cores of varying diameters may also be used. The conventional load roll arrangements have indeed a certain adaptability and, by means of an appropriate swiveling motion of the support arms, are able to handle differences in height, i.e., differences of up to 35 mm in diameter of the winding cores placed in the winding bed.
However, this is insufficient in the case of the newer requirements. There is a need for arrangements in which simultaneously winding cores with a diameter of 100 mm or 120 mm and a diameter of 180 mm can be used.
Working with a set of individual winding cores having such varying diameters has been possible thus far on carrying rolls with individual winding stations facing each other.
It is the object of the invention to create a load roll arrangement of this type in such a way that on the corresponding multiple-drum, preferably two-drum, winding arrangement winding cores with greater differences in diameter can be used.
This object is solved by means of the invention disclosed in claim
1
.
While in the case of the conventional two-drum winding arrangements, at a certain height of the support beam, only 35 mm of lift was available which is possible within the bounds of normal pressure application of the load rolls. In order to apply the load rolls in the presence of varying wound roll diameters, due to the additional adjustment arrangement of the invention, it has become possible to bring the load rolls hanging on the support beam at more greatly varying heights, and in this way to adapt the load rolls to a “diameter profile” that results along the winding bed from winding cores that differ from each other. When the respective core has a smaller diameter, the load roll arrangements located within its longitudinal area are lowered further. In the case of greater diameters, the load rolls are raised. Thus, on all winding cores of varying size, a resting is possible without confinement to the limitations of the range of tolerance of the normal load roll arrangement.
Particularly, the adjustment arrangement in accordance with claim
2
may comprise individual adjustment units that engage the respective mounting arrangement. The mounting arrangement is a structural unit that comprises, respectively, a carrier for the support arms that can be swiveled up and down, the support arms themselves and the force member that, while the support arms are swiveled, press the respective load roll onto the wound roll.
Structurally, the simplest approach is displacement of the mounting arrangement with respect to the support beam on a slide guide.
For this purpose, it may be advantageous for the displacement to occur with the aid of a connecting rod in the manner indicated in claim
4
.
In the normal position, the respective mounting arrangement takes the highest position in which it is resiliently held in accordance with claim
5
, for example, by means of a helical spring in accordance with claim
6
.
The advance of the connecting rod, in accordance with claim
7
, may take place by means of a control element present in each adjustment unit which, according to claim
8
, is in the form of a cam plate.
Accordingly, on the upper surface of the support beam, a number of cam plates corresponding to the number of adjustment units, are present.
A structurally simple solution for driving these cam plates is the common adjustment shaft on which all cam plates are rotatably mounted and which via drag levers are engaged selectively by the cam plate or not, depending on whether the latch connecting both is engaged or not.
The adjustment shaft does not rotate continuously but merely covers a pivot angle range of, for example 270°, wherein the one critical angle causes the connecting rod to be lifted and a height adjustment of the load roll which, for example, corresponds to the greatest existing winding core diameter and the other limit is laid out correspondingly for the smallest winding core diameter.
By utilizing intermediate angle positions, an adaptation to intermediate diameters can take place.
REFERENCES:
patent: 4105170 (1978-08-01), Schonmeier
patent: 5165618 (1992-11-01), Ruff
patent: 5320299 (1994-06-01), Fitzpatrick et al.
patent: 2 147 673 (1991-01-01), None
patent: 295 07 313 U (1995-01-01), None
patent: WO 93/15009 (1993-01-01), None
Dorfel G. Walter
Gorner Bernd
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