Paper making and fiber liberation – Apparatus – Apparatus repair – cleaning or conditioning
Reexamination Certificate
1994-10-07
2001-03-20
Cuda, Irene (Department: 3726)
Paper making and fiber liberation
Apparatus
Apparatus repair, cleaning or conditioning
C241S285100, C248S223410, C162S273000, C492S047000
Reexamination Certificate
active
06203668
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a device for fastening a roll to a frame construction in a paper machine, paper finishing machine, or equivalent, wherein the ends of the roll are provided with bearings housings. The bearing housings, or fastening bases that have been formed onto the bearing housings, are mounted against a back-up face formed on the frame construction so as to position the roll in its place on the machine frame. A method for fastening the roll to the machine frame is also disclosed.
In certain parts of paper machines, board machines and equivalent and/or of paper and board finishing machines, quick replacement of rolls is required in order that unduly long standstills could be avoided. Quick replacement of rolls is a particularly important property in soft calenders, in which, out of the rolls that form the calendaring nip, the soft faced roll must be replaced from time to time and quite frequently for conditioning. However, in conventional frame constructions, the opening of the fastening screws and, on the other hand, the tightening of the screws to the correct tightening torque, constitute quite a laborious and time-consuming working step. The fastening screws are placed in very awkward locations, for example high above the floor plane, far from tending platforms, in narrow gaps, and close to hot roll faces. Also, tightening of the screws to the correct torque requires a high force whose generation under the circumstances referred to above is difficult and even dangerous.
Owing to the drawbacks mentioned above, in the prior art, attempts have also been made to develop various fastening arrangements in which the roll is fastened to the frame construction without screws by means of particular fastening members. However, for the most part, these fastening arrangements have involved a number of considerable drawbacks, such as complicated fastening arrangement and unreliability of the fastening, for which reason such fastening arrangements in machine constructions in operation have been very rare. Moreover, it has not been possible to apply any of such fastening arrangements to a soft calender.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a device and method for fastening a roll to the frame construction by means of which the above drawbacks involved in the prior art are avoided.
It is another object of the present invention to provide a new and improved device and method for fastening a roll to the frame construction by means of which the fastening and detaching of the roll can be carried out easily and rapidly.
In view of achieving these objects and others, in accordance with the invention, fastening members are arranged on the frame of the machine and can be displaced forcibly substantially in a direction perpendicular against the back-up face formed on the frame construction. The fastening members are provided with a flange portion, i.e., shoulders or with equivalent formed pieces, whereby by providing bearing housings or the fastening bases fitted on the bearing housings with at least one groove corresponding to the shape of the flange portions of the fastening members, a secure fastening is attained. In this manner, when the roll is installed in its operating position, the flange portions are arranged to pass into the at least one grooves in the bearing housings, and the fastening members are arranged to tighten the bearing housings or the fastening bases, respectively, forcibly against the back-up faces on the frame construction. Preferably, the bearing housings or fastening bases formed thereon have two grooves so that there are two fastening members having a flange portion which are situated on each side of the roll.
By means of the invention, compared with the prior art, a number of advantages are obtained, of which some of the most important ones are security and reliability of operation of the fastening device. By means of the device in accordance with the invention, the roll also remains in its position in the event of any disturbances. The invention can be applied most advantageously so that, when the device in accordance with the invention is used, the roll is attachable to the frame construction and detachable from the same completely untouched by hand, i.e., by the intermediate of the control desk. Manual operation is, however, also fully possible if desired.
In the method for fastening a roll to a frame of a paper machine, paper finishing machine, or equivalent, in accordance with the invention, the ends of the roll are provided with bearings and fastening members having a flange portions, i.e., shoulders or formed pieces, are arranged on the machine frame. The roll bearings are mounted in respective bearing housings arranged against back-up faces of the machine frame. To fasten the roll, the bearing housings are displaced into connection with the machine frame such that at least one groove in the bearing housing receives a respective one of the flange portions of the fastening members, and the fastening members are then displaced in a direction substantially perpendicular to the back-up faces to tighten the bearing housings against a respective back-up face. The bearing housings can be displaced in a direction parallel to a respective one of the back-up faces in conjunction with the displacement of the fastening members to tighten the bearing housings against the back-up faces. Further, the displacement of the fastening members can be controlled by remote-control via a control desk.
Further advantages and characteristic features of the invention come out from the following detailed description of the invention.
In the following, the invention will be described in detail with reference to some exemplifying embodiments of the invention illustrated schematically in the figures in the accompanying drawings. However, the invention is by no means strictly confined to the details of these embodiments.
REFERENCES:
patent: 2379752 (1945-07-01), Schultz
patent: 3840192 (1974-10-01), Hendrickson
patent: 4770382 (1988-09-01), Lehti
patent: 5193262 (1993-03-01), Hyde et al.
patent: 2535039 (1977-02-01), None
patent: 77105 (1988-01-01), None
patent: 527541 (1976-05-01), None
Immonen Raimo
Koivukunnas Pekka
Cuda Irene
Steinberg & Raskin, P.C.
Valmet Corporation
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