US3549098A - Paper rolling device for use in paper machines - Google Patents

Description

United States Patent [72] Inventors Viki Helkala;

Sauli Koskela, Jyvaskyla, Finland [2]] Appl. No; 738,218 [22] Filed June 19,1968 [45] Patented Dec. 22, 1970 [73] Assignee Valmet 0y Helsinki, Finland a corporation of Finland [32] Priority June 20, 1967 [33] Finland [31] No. 1739/67 [54] PAPER ROLLING DEVICE FOR USE IN PAPER MACHINES 1 Claim, 2 Drawing Figs.

[52] U.S.CI. 242/67.1

[51] Int. Cl B65h 17/02 [50] Field of Search 242/67.1

[56] References Cited UNITED STATES PATENTS 1,868,115 7/1932 Mulligan 242/67.l

Primary Examiner--Nathan L. Mintz Attorney-Richards & Geier ABSTRACT: A paper rolling device for paper making machines has two adjacent rolls, one of which serves normally as a bobbin for the paper. The second roll which is a driven one has a perforated zone located close to one end of the zone. Inside the second roll and below the perforations, a suction box is located which is followed by a blow box, thereby preventing a narrow strip of paper passing between the rolls from being wound upon the second roll.

PATENTEDUECZZIBTG 3,549,098

WINDING ROLL V/kl HELKALA m! 5414/ Maxim 3 wrsmns I fig PAPER ROLLING DEVICE FOR USE IN PAPER MACHINES The present invention concerns a paper-rolling device for use in paper machines, comprising two parallel cylinder rolls, one of which acts as bobbin for the paper roll to be wound and through the pressure nip defined by which rolls the paper to be wound on the roll acting as bobbin for the paper roll passes.

When a paper machine is started up or, e.g., when for some reason the paper web breaks while the machine is running, which happens comparatively often in practice, the procedure is to separate from the paper web a narrower strip, which is guided and passed through the machine with the aid of rope arrangements and compressed air jets. After one has succeeded in passing the said strip through the rolling device of the paper machine, one allows it to increase gradually to the entire width of the paper web, whereupon the normal production run of the machine may be resumed. It is highly important from the viewpoint of operational economy, owing to the great capital investment tied down in a paper machine, to strive by any possible means to minimize the breaks which occur in the productive time of the machine because, as it well known, in the case of a paper machine every standstill minute or equivalent represents a considerable economic loss.

When the above-mentioned paper strip is being guided to pass through the rolls of the rolling device in the paper machine, great difficulties are encountered in practice for the reason that the rotation of the rolls of the rolling device causes before the press nip of these rolls a pressure zone which tends to prevent the end of the paper strip from entering between the rolls. The object of the present invention is to facilitate the introduction of the paper strip between the said rolls, and in the invention this is accomplished by inhibiting the generation of the said pressure zone or at least appreciably reducing its strength at least in that part of the press nip defined by the rolls through which the said paper strip is passed.

The invention is mainly characterized in that the mantle surface of the second roll cooperating with the rollwhich takes care of the winding-on, or of the'so-called Pope cylinder roll, has been provided with a zone extending over the circumference of the roll and provided with holes piercing through the mantle and which zone has a width substantially smaller than the length of the roll. The actual width of the zone depends on the length of the roll and is a fraction of that length.

The invention is described in the following in closer detail with reference to the attached drawings, in which one embodiment of the invention has been schematically displayed.

FIG. 1 is a section on line 1-1 of FIGQZ.

FIG. 2 is a perspective view of the device shown in FIG. 1, with some parts broken off.

The rolling device comprises two cylinder rolls 1 and 2, of which at least one roll, or the so-called Pope cylinder roll is a driven roll. The roll I normally acts as bobbin for the paper to be wound on. When for one reason or another e.g. breakage of the paper web has occurred on the machine, the paper strip 4 which is a narrow part of the web is presented to one end of thepress nip defined by the rolls 1 and 2 and this strip is passed through between the rolls 1 and 2, whereupon one begins to increase the width of the paper strip at the other end of the machine until it conforms to the full working width of the machine and the paper web is guided to encircle the roll 1. According to the invention, at one end of the roll 2 a perforated zone 5 has been provided, which prevents the formation of a pressure zone or essentially reduces its strength in front of the press nip defined by the rolls 1 and 2. The actual width of the perforated zone depends upon the length of the roll 2 and is a fraction of that length. The design of one end of the roll 2 has been changed from normal by fixing the combined end piece and journaling piece 3 at greater than usual depth inside the roll 2.

The efficiency of the perforated zone 5 may be improved by arranging on its inside, below the press nip defined by the rolls 1 and 2, a suction device, e.g. a suction box 6 belonging to prior art in itself, which produces a suction zone 8 on the upper surface of the roll 2. In order to ensure detachment of the paper strip 4 from the surface of the roll 2 after one has succeeded in passing it through, it is possible, and indicated, to provide after the suction box 6 a blow box 7 or equivalent, which creates a pressure zone 9 and prevents the paper strip from winding itself around the roll 2. lt is obviously proper to render the suction and blow boxes inactive when the paper machine is running in conventional manner.

The invention is not restricted to the example of embodiment presented nor to anything else that has been presented in the foregoing.

We claim:

1. A paper rolling device for paper making machines, comprising two interengaging rolls, a length of paper being adapted to pass between said rolls and to be wound upon one of said rolls, the other roll having a perforated zone extending over a fraction of its length, a suction device located within said other roll and communicating with some of perforations of said zone and a blowing device located within said other roll and following said suction device, said blowing device communicating with other perforations of said zone.

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