Winding – tensioning – or guiding – Convolute winding of material – Simultaneous winding
Patent
1994-07-26
1996-05-21
Darling, John P.
Winding, tensioning, or guiding
Convolute winding of material
Simultaneous winding
2425416, 2425421, B65H 1814
Patent
active
055181996
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a machine for making paper or cardboard rolls. More particularly this invention concerns a method of and apparatus for winding paper strips cut from a light-gauge wide paper web into individual rolls.
BACKGROUND OF THE INVENTION
Winding machines are known for making wound rolls from individual webs produced by longitudinal slitting of paper or cardboard webs wherein the wound rolls engage peripherally during winding against one or two driven support of carrying rollers. In these winding machines called periphery winders the wound rolls are rotated by the driven support or carrier roller during winding. German 3,933,861 describes this type of support-roller machine where the wound rolls are arranged alternately to both sides of a vertical diameter plane of a central support roll against which they engage during winding. Freely rotatable guide heads are engaged in the ends of the sleeve of each wound roll to partially or wholly support the roll weight.
It is known from German 4,012,979 to connect each guide head with a rotary drive in order to individually control the tension of each wound roll during winding. These additional center drives are very expensive in the working of very wide (8 m and more) paper webs with several winding stations (10 and more) and in addition increase the minimum width of a wound roll since the driven guide heads cannot be lowered on the winding support to fit them with new sleeves and to unload the wound rolls.
Practice has shown that with papers with low weight per unit area, in particular newsprint, undesired crepe folds are formed in the two outer wound rolls (end rolls) under certain circumstances when they are wound with winding machines where the wound rolls are exclusively rotated by the driven support or carrying roll during winding.
OBJECT OF THE INVENTION
It is an object of the invention so to improve the described type of winding machine that end rolls of better quality can be produced with minimal constructive costs.
Another object is to provide an improved method of winding up paper strips into rolls and of operating a roll-making machine of the above-described type.
SUMMARY OF THE INVENTION
These objects are attained according to the instant invention in a roll making machine having an elongated support roller centered on and rotatable about a horizontal axis and at least one row of takeup rolls coaxial to a takeup-roll axis parallel to the support-roller axis and including at least one central roll and a pair of end rolls axially flanking the central roll. The rolls are closely juxtaposed with the support roller and at least the central roll radially engages the support roller. A relatively wide paper web is fed to the support roller and a cutter between the web supply and the support roller slits the web into a plurality of strips including at least one central strip and a pair of end strips flanking the end strip. The central and end strips pass at least partially around the support roller and are wound on the respective central and end rolls. The support roller is rotated about its axis so that the strips wind at least partially around the support roller and at least the central roll is rotated by engagement with the support roll. According to the invention respective end-roll periphery drives radially engage the end rolls and rotate same at a greater peripheral speed than the support roller.
It has been shown that with newsprint the paper web does not have a uniform length but is longer at the edges of the web. Thus the web tension before winding is less for the two end rolls than for the central rolls and this must be compensated for to obtain a uniform roll hardness of a rolling setup with an increased line load on the contact line of the edge rollers and the support or carrying roller. The different relationship between web tension and line load with the end rolls increases the likelihood that crepe folds will appear.
According to the invention the web tension of the end rolls can be increase
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Hehner Reinhard
Heymanns Willi
Schonmeier Herbert
Welp Ewald G.
Darling John P.
Dubno Herbert
Jagenberg Aktiengesellschaft
Wilford Andrew
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