Winding – tensioning – or guiding – Convolute winding of material – Simultaneous winding
Patent
1991-12-23
1995-04-11
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
Simultaneous winding
2425411, 2425423, B65H 1810, B65H 2304
Patent
active
054050995
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This is the U.S. national phase of PCT/EP91/00191 filed 01 Feb. 1991 with a claim to the priority of German application P 4,012,979.9 filed 24 Apr. 1990.
1. Field of the Invention
The present invention relates to a method of and apparatus for winding up material webs, in particular cardboard or paper webs, on winding sleeves. More particularly this invention relates to such a system wherein a material web pulled from a supply roll against a braking force is separated by longitudinal cutting into individual strips which are subsequently wound up under tension to individual wound rolls.
2. Background of the Invention
When winding up paper or cardboard webs which are drawn off a supply roll and which are subdivided by longitudinal cutting into individual strips, the webs must be exactly guided through the winding machine and during longitudinal cutting and winding-up must be held under a certain tension. The tension is created by driving the winding roll against a braking force effective on the supply roll, driving of the windup roll being effected by a support or brace roll engaging on its periphery and/or with a guide head connected to a rotary drive engageable in the windup sleeve. Since the tension during winding-up substantially influences the quality of the wound-up roll it is known to control it via the drives of the support or braking rolls or of the guide head and/or of the payout brake of the supply roll.
German published application 3,514,042 describes such a method wherein between the supply roll and the longitudinal-cutting device there are draw rollers and between the draw rollers and the wind roller a web-tension controller is provided. Between the tension rollers and the support roll a stretch control is effective.
German patent 2,060,753 describes a method and apparatus for winding up web-like material on two winding axles which are arranged diametrally opposite each other in a horizontal plane in a support roll. The winding rolls are held on their sleeves by means of retractile guide heads which are fixed in support slides movable radially of the support roll. In this machine the tension is created solely by the support roll braced on the windup roll against the retaining force of the supply roll as it pays out.
It has been shown that the tension of the webs between paying out and rolling up has at best different values depending on the type of paper being used and the necessary winding quality. Thus, on longitudinal, cutting higher tensions are needed much more than for winding up to achieve a tight roll. It can happen that on winding up high tensions are needed for example in core winding by means of a driven guide head of rolls of LWC paper.
OBJECT OF THE INVENTION
It is an object of the invention to so improve such a method and winding machine that different tensions can be set for longitudinal cutting and at the windup location.
SUMMARY OF THE INVENTION
This object is attained according to the invention in a method of the standard type where the web is pulled from a braked supply roll, is longitudinally slit into individual strips, and is then wound up on at least one takeup roll by pinching the individual strips between two pinch rolls at a location the slitter and the takeup roll, and by driving or braking the pinch rolls such that the web is under substantially more tension upstream of the location than downstream therefrom.
By frictionally guiding the webs over a driven roller the tension is subdivided into two stretches of the web, upstream of the driven pinch roll and downstream of the driven roll. The subdivision can be set by the torque applied to the driven roll. Since the interruption of the tension is downstream in the web-travel direction from the longitudinal-cutting device, the longitudinal cutting can be carried out at a substantially higher tension than the winding up. It is particularly advantageous here that the tension necessary for the desired winding quality can be completely independent of the tension requirements in o
REFERENCES:
patent: 1838612 (1931-12-01), Cameron
patent: 3157371 (1964-11-01), Billingsley
patent: 3386679 (1968-06-01), Foulon
patent: 3433429 (1969-03-01), Schnitzspahn
patent: 3712554 (1973-01-01), Lorenzini et al.
patent: 3792824 (1974-02-01), Meyer et al.
patent: 4245796 (1981-01-01), Eglinton
patent: 4767075 (1988-08-01), Peters et al.
Hehner Reinhard
Urban Ernst-Gunther
Dubno Herbert
Jagenberg Aktiengesellschaft
Jillions John M.
Wilford Andrew
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