Presses – Concurrent pressing and conveying – Roll type
Patent
1999-06-28
2000-10-31
Gerrity, Stephen F.
Presses
Concurrent pressing and conveying
Roll type
68258, 100170, B30B 304
Patent
active
06138559&
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an apparatus for processing web-shaped material comprising a working roller extending in the longitudinal direction of the apparatus, a counter support forming a counter support surface against which the web material is pressable over the whole working breadth, which corresponds to the web width, by means of the working roller, a pressure bearing structure with a front side for surface mounting the working roller on this front side and applying a pressing force to said working roller, a supporting carrier extending in the longitudinal direction of the apparatus, the pressure bearing structure and a supporting wall of the supporting carrier being arranged to be movable relative to one another in the pressing direction, and a pressing device for generating a pressing force, the pressing device comprising a cavity between said pressure bearing structure and said supporting wall, and a pressure hose arranged in said cavity, said cavity extending in the longitudinal direction of the apparatus and changing with said relative movement, a pressing chamber with oval or flat cross section being provided between a counter support surface for the hose formed on said pressure bearing structure and the supporting wall for applying a pressing force over the rear side of the pressure bearing structure, the pressing volume of said pressing chamber being defined by the amount of pressing medium contained in the hose.
An apparatus of this kind is known from U.S. Pat. No. 2,878,778. The press device with an inflatable pressure hose has proven particularly suitable for generating the desired high pressing forces on the working roller (nip roller). However adjustment problems and uneven roller running conditions occur and reoccur with these known apparatus and increased productivity demands specifically with regard to uniformity and the adjustability of the pressing force, require the use of relatively costly structures which increase production costs. An edge clamping attachment for the hose leads to wear and relatively short durability. Bearing rollers are axially mounted and guided in a pivotal frame on which the pressing force generated by means of the pressure hose is exerted. In another known apparatus (European Patent Specification No. 0 534 930) specific measures for allowing the flexible adjustment of the working roller are provided in which several separately controllable elements for generating pressing force are formed by pneumatic pistons.
Objects of the invention consist of improving the simplicity of construction, durability, operational security, maintenance, operation and the operating result of an apparatus of this type for processing web-shaped material.
These objects are achieved in connection with the features of the aforementioned apparatus in that the pressure hose is provided as a pressure hose element which comprises an L-, U- or oval-shaped form when the apparatus is viewed in longitudinal section, at least one bent portion directed away from the counter support surface for the hose towards the rear side of the apparatus and a supporting portion adapted to lie in planar fashion against said counter support surface for the hose, a hose free space being formed within said cavity at each filling state of the hose by each bent portion between said counter support surface for the hose and the supporting wall. According to the invention at least one end of the pressure hose element is bent backwards towards the rear longitudinal side of the apparatus. By virtue of the bent portion the pressure hose element will lie as uniformly as possibly against the support surface of the pressure bearing structure for the range of large to small working pressures and also can be accommodated entirely behind the bearing structure without the need for clamping connection means.
A particularly advantageous and useful embodiment of the invention is achieved when a working unit formed by the pressure bearing structure and the working roller in pressing relationship is arranged between the counter support
REFERENCES:
patent: 2851869 (1958-09-01), Quoos et al.
patent: 2878778 (1959-03-01), Kusters
patent: 3592036 (1971-07-01), Blain
patent: 5302203 (1994-04-01), Zimmer
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