Winding – tensioning – or guiding – Convolute winding of material – Pressure element against coil
Reexamination Certificate
1999-01-25
2001-04-03
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
Pressure element against coil
C242S541600, C242S541700, C242S542400
Reexamination Certificate
active
06209818
ABSTRACT:
The invention pertains to a rider roll arrangement, to weight at least one winding of a material in the form of a web which is supported during winding in a winding device.
A rider roll arrangement of the same generic class is known from U.S. Pat. No. 5,320,299. In order to be able to hold the individual weighting rollers in contact with the winding along a line of contact (nip line), the brackets are mounted to the support beam in an articulated manner, such that the weighting rollers can be swung, independently of each other, about a pivot axis with respect to the support beam. A swinging of the weighting rollers on their brackets is carried out by means of one piston rod respectively, each end of which is applied with pressure by means of piston/cylinder units; the center regions of the piston rods feature a hinge for a pivoted connection with the associated brackets. A clear improvement of the winding structure was achieved with the known rider roll arrangements. However, due to the piston rod, the piston/cylinder units acting upon its two ends must be in extraordinarily precise alignment with each other. In addition, the bracket associated with each weighting roll transfers lateral force to the piston rod as it swings about the pivot axis.
Further the U.S. Pat. No. 3,389,450 discloses a roll comprising a support and a sleeve rotatable thereon, having means for removing transverse deflection or sag. A series of annular spools, including at least a pair of end spools, are rotatable mounted on the axis by a series of antifriction bearings, each spool being supported at either end by one of these bearings. Each of the intermediate bearings is radially adjustable on the axis by means of four support shoes arranged in pairs, which arcuately engage the inner circumference of the bearing. Each shoe is connected with one of corresponding hydraulic pistons, to adjust the position of the support bearing in this direction. The pistons are arranged for movement along a perpendicular axis radial to the support, to adjust the shoes to compensate for the change of internal dimension of the bearing along this axis as the bearing is shifted along the first axis. The pistons are supplied by fluid pressure at independently-controlled levels, wherein cylinders of corresponding orientation in each of their supports are connected in common, so that an equal adjustment of two bearings being symmetrically spaced with respect to the axial center of the axis is maintained. To adjust the pressure in each of the supply lines bellows are included which volumes are adjustable by means of screws. To adjust the entire roll with the series of annular spools the bellows and the corresponding cylinders are adjusted to straighten the roll.
The object of the invention is to create a compact rider roll arrangement, with which the space required for installation of the rider roll arrangement can be reduced. An additional object is to create a rider roll arrangement that enables a rapid and simple exchange of the weighting rollers for repair or maintenance work. Yet another object of the invention is to be able to select the number of weighting rollers per meter of rider roll width to be as high as possible.
In order to solve these problems, a rider roll arrangement is proposed. Due to a combination of the means for the pressing and lifting respectively of each individual weighting roller in a piston/cylinder unit that acts in two directions and due to the arrangement of this unit in the interior of the weighting roller, the building space required for each weighting roller with respect to the rider roll width is minimal. For this purpose, it is preferable to use pistons and cylinders that are separate from each other. Since a swinging of the weighting rollers with respect to the support beam can be omitted on one hand and since, on the other hand, a piston rod that is put under load on both sides can be omitted, it is especially simple to exchange the weighting rollers by means of detaching the brackets from the support beam.
The combination of hydraulic means and/or pneumatic means in a common piston/cylinder unit enables a precise variation of the nip pressure between the relevant weighting rollers and the winding that is weighted by means of said weighting roller, since slight differences in force between the pressing force and the lifting or compensating force acting in the opposite direction lead to a significant variation in nip pressure.
In a preferred embodiment, the cylinder comprises opposing cylinder chambers, with the hydraulic means acting upon the cylinder chambers that faces the at least one winding and the pneumatic means acting upon the opposite cylinder chamber, which faces away from the winding. This solution can be achieved in a preferred way with a cylinder having an H-shaped cross-sectional profile.
It is preferred for the brackets to comprise a central plate, to which the weighting rollers are mounted in pairs. With this arrangement, the number of weighting rollers per meter of rider roll width can be further increased and, simultaneously, two weighting rollers are exchanged in one step. A very simple mounting of the weighting rollers to the brackets can be achieved by means of mounting the cylinders in a fixed manner to the associated brackets. In particular, this mounting can be selected to be, in fact, fixed but in a detachable manner, e.g., by means of a screw connection, such that when exchanging a weighting roller, in particular with a paired arrangement, the other respective weighting roller can continue to be used.
In order to control nip pressure, it is advantegous that the cylinder chambers for the hydraulic means of the weighting rollers arranged in pairs are connected to each other and only the pneumatic means are controlled individually. By this means it is also possible to completely lift away weighting rollers that are not required, as is the case when winding several windings in the winding device, in the gap between windings, without the need to undertake structural modifications to the rider roll arrangement.
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patent: 295 07 313 U1 (1995-05-01), None
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patent: 2-144359 (1990-06-01), None
Dorfel G. Walter
Treutner Jurgen
Pham Minh-Chau
Walsh Donald P.
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