Winding – tensioning – or guiding – Convolute winding of material – With spool loading or coil removal
Patent
1998-10-26
2000-08-29
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
With spool loading or coil removal
2425415, B65H 1820, B65H 1826, B65H 1930
Patent
active
061095591
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a rider roll unit for winding machines with at least one support or carrier drum for winding web-like material to be wound, in particular paper or the like roll to be wound under a load, as a function of its diameter in diameter of the roll to be wound.
A rider roll unit of this kind is known from EP-A1 0,640,544 in conjunction with a double support drum in which the second support drum in the web running direction can be lowered during the winding process.
For use in so called center drive winders, the DE 39 18 520 A1 and the WO 95/32908 disclose devices with load roll units comprising frames bearing two rolls around which an endless belt is fitted running. The load roll units as a whole may be tilted along a pass approximately parallel to the circumference of the roll to be wound by means of lever arms and a first group of piston/cylinder units. A second group of piston/cylinder units is used to tilt the frame in order to keep the nip load between the roll to be wound and the load roll unit uniform. The first and second group of piston/cylinder units are independly moved.
The DE 38 16 774 A1discloses a winder with a load roll and two support rollers, one of which is a belt roller arrangement. The load roll is borne at a support beam fixedly mounted to the end of a tilt arm that may be tilted around a stationary articulation point by means of a first cylinder/piston unit. A second piston/cylinder unit is arranged exactly parallel to the tilt arm in order to lift said load roll when the winding is finished.
SUMMARY OF THE INVENTION
To optimize the winding structure according to this invention, it is proposed that in a generic rider roll unit, the tie-bar with the rider roll can pivot at the support arms around the first axle parallel to the support drum, and a guide-bar articulated at the tie-bar pivotable around a second axle parallel to the support drum causes a forced pivoting of the tie-bar with the rider roll about the first axle, when the tie-bar with the rider roll is elevated in adapting to the increasing diameter of the roll, so that the acting direction of the rider roll changes on the roll.
Through suitable selection of the guide-bar geometry, due to the invention the result is, on the one hand, that the operating direction of the rider roll is always at a right angle with respect to the surface of the roll being wound. Thus, it is possible to use highly sensitive control means to control the contact pressure of the rider roll against the roll being wound. Control means of this kind are known from PCT/EP 96/01877. On the other hand, through suitable selection of the guide-bar geometry, a base motion line of the rider roll can be specified in accordance with the increasing diameter of the growing roll, such that the load distribution of the rider roll on the first and on the second support drum changes in accordance with the increasing roll diameter in order to achieve on optimal winding structure.
The winding structure can also be affected significantly by the fact that the geometry of the guide-bar is variable, and specifically either before beginning a new winding process and/or during each winding process. Particularly preferred is a guide-bar with variable active length or a guide-bar with a locally variable articulation point. Basically it is also possible, alternatively or cumulatively, to affect the guide-bar geometry by changes in the support arms, in particular, by realizing a variable length or by changing the location of the articulation point on the machine side.
Rider roll units with variable guide-bar geometry also make it possible to implement supplemental functions, for example, using the rider roll as a roll ejector.
The components or process steps stated above, and also those claimed or described in detail in the embodiment according to this invention, are not subject to any particular exemptions with respect to their size, structure, material selection and technical concept or process conditions, so that the selection criteria known in the particul
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Dorfel G. Walter
Goerner Bernd
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