Roll and calender

Details Roll and calender Roll and calender

2000-11-09

2003-07-08

Vidovich, Gregory (Department: 3726)

Roll or roller

With internal anchor for annular member

C226S191000, C226S194000, C226S090000, C029S895200

Reexamination Certificate

active

06589145

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 199 55 862.0, filed on Nov. 20, 1999, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a roll with a roll jacket that is rotatably supported by a bearing ring on an axis that is held in a non-rotatable manner. The bearing ring is moveable relative to an axis parallel to a radial direction, and a locking device that unblocks or blocks a radial lift movement. The invention further relates to a calender roll that includes the neighboring roll arranged to form a nip, and at least one further roll. The neighboring roll and the at least one further roll are displaceable in the pressing direction.
2. Discussion of Background Information
Such a roll is known, e.g., from DE 36 04 839 C2. Here, a locking device is formed as a half-moon or sickle-shaped wedge that can be placed into a gap between the roll jacket and the axis when the roll jacket is located in a completely raised or completely lowered position relative to the axis.
In many calenders, sag compensation rolls are used as the upper and lower end rolls. However, both of these sag compensation rolls are of different types, which are usually labeled as K and F types, i.e., the one roll is embodied as a roll with a jacket lift. Such a roll, the roll jacket can move in a radial direction relative to the axis. In the other roll, however, the roll jacket is firmly fixed on the axis, which results in necessitating that two different reserve rolls must also be kept in stock. For this reason, a possibility is provided in the above-mentioned DE 36 04 839 C2 of being able to achieve both types of roll with one single reserve roll. However, in order to reconfigure this roll from one type of roll, e.g., with a jacket lift, to the other type of roll, i.e., without a jacket lift, some mounting measures are necessary. This is relatively unpractical and dangerous, especially in the case of calenders that remain online. Above all, the reconfiguration expense is relatively high.
SUMMARY OF THE INVENTION
The invention simplifies the change in mode of operation from a roll with jacket lift ability to a roll with a fixed jacket.
Therefore, the present invention a roll of the type mentioned at the outset in which the locking device has a rotatable part with a longitudinal opening that can be turned to a first rotational setting in which the longitudinal opening is aligned substantially parallel to the lift movement direction, and a second rotational setting, in which the lift movement is blocked.
With this construction, it is possible to change the mode of operation from a roll with jacket lift ability to a roll in which the jacket is fixed to the axis, or vice versa, without any other retrofitting measures. It is simply necessary for the rotatable part of the locking device to rotate correspondingly. In one rotational setting, the longitudinal opening provides a path of movement in which the axis can be moved relative to the roll jacket. In the other rotational setting, the longitudinal opening is structured in such a way that this path of movement is no longer available. If the axis is fixed laterally, i.e., crosswise to the lift direction relative to the axis, the roll jacket is fixed on this axis with a relatively high degree of precision in this setting of the rotatable part. Usually, the rotatable part is rotated approximately 90° between the first and second rotational settings. However, this is not obligatory. It is also conceivable to use more than one rotatable part, as long as the condition is fulfilled that one longitudinal opening, in one rotational setting, allows the lift movement of the axis in the roll jacket or of the roll jacket relative to the axis, while this lift movement is prevented in the other rotational settings.
Preferably, the rotatable part is formed by the bearing ring or is moveable together with it. This facilitates the production as well as the handling. The bearing ring is rotatable relative to the roll jacket in any case. In this regard, therefore, no further arrangements need to be made. The only additional task is making the bearing rotatable relative to the axis as well in order to bring the longitudinal opening either into alignment with the lift movement direction or to remove it therefrom.
Preferably, the rotatable part can be rotated around the rotational axis of the roll jacket. This further simplifies the movement control and the constructive structure.
Preferably, the longitudinal opening has concave sections on its longitudinal edges whose bending radius corresponds to the axis in this region, where the axis in the region of the rotatable part has flattened sections that extend parallel to the direction of movement. The concave sections can be used to support the rotatable part on the axis if the rotatable part is in the blocked position. In this case, the rotatable part encloses the axis and lies against the circumference with its concave sections. Even if this contact does not occur over the entire circumference of the axis, the bearing is sufficient in most cases.
Preferably, the distance between the flattened sections is just as large as the clear width of the longitudinal opening. Thus, the longitudinal opening simultaneously also serves as a guide for the rotatable part in relation to the axis during the lift movement.
More advantageously, slides lie on the flattened sections. These slides have a flat underside and an upper side having the same bend as the axes in the region of the rotatable part, at least on one part of the axial length. Therefore, on this part of the axial length, the assembly of the axis and slides forms a cylinder jacket surface such that the rotatable part can be supported in every rotational position on a corresponding section of the cylinder jacket surface. Thus, the rotatable part is held reliably when the roll jacket performs a lift movement in relation to the axis.
Here, it is preferred for the slides to have a radially protruding projection with at least one support surface that cooperates in the axial direction with a corresponding opposing surface on the rotatable part. Thus, an axial fixing of the rotatable part in relation to the axis and/or the slides is achieved.
Preferably, the projection fits into an inner groove on the rotatable part. Thus, the slide is fixed in both axial directions in relation to the rotatable part.
Preferably, the rotatable part is supported on the radially outer side of the projections. Thus, a further support option results for the rotatable part that is particularly advantageous when the roll jacket is fixed in relation to the axis. Namely, in this case, the rotatable part can be supported in relation to the axis on at least a total of four positions. Even if one or the other support is occasionally less effective or not effective at all, e.g., due to strain, a very stable support is achieved with this construction.
Preferably, the roll is embodied as a sag compensation roll. Such rolls are best able to utilize the jacket lift characteristic.
It is also advantageous that the axis has a decreased diameter in the region of the rotatable part. Thus, sufficient space is available to accommodate the rotatable part without the diameter of the roll jacket needing to be overly enlarged.
The present invention provides a calender of the type mentioned at the outset which includes devices that optionally block or unblock the neighboring roll.
Such a construction provides the option of operating the calender with all nips. In this case, the jacket is fixed in relation to the axis, such that the ability of the jacket to be displaced is blocked. Further; the neighboring roll is freely displaceable, which is important for opening the nips, among other things. Opening the nips is necessary, e.g., for inserting a material web. However, if the calender is to be operated with only one nip, i.e., formed between

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