Presses – Concurrent pressing and conveying – Roll type
Reexamination Certificate
1999-05-21
2001-05-29
Gerrity, Stephen F. (Department: 3721)
Presses
Concurrent pressing and conveying
Roll type
C068S258000
Reexamination Certificate
active
06237481
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns an apparatus for processing a material web comprising a stationary backing roller extending the length of the device, a working roller which can be displaced to press against the latter and has a small diameter in relation to the backing roller diameter, a pressing device by means of which the working roller can be pressed against the backing roller along a contact zone, which is continuous over the working width and allows the material web to pass through it, wherein the pressing device has a pressing body with a pressing surface, against which the working roller comes to lie on its peripheral area opposite the contact zone, and a supporting element, arranged separately form the pressing body, with a support body surface, on which the working roller comes to lie during the pressing operation. Such apparatuses are used particularly as dyeing devices for squeezing, i.e. for the dehydration and dyeing of webs saturated with dye, so-called padding machines.
2. Prior Art
An apparatus of this type is familiar from EP 0 534 930. Here both a stationary and a moving bearing bed are each provided with at least one cylindrical pressing body for the pressure application of a working roller, which is conceived as a revolving roller driven by a fixed mating roller. The stationary pressing body is a supporting body, which operates as a passive counterpressure or backing body against the pulling power exercised by the mating roller on the working roller. Such a familiar arrangement can result in disadvantageous spline effects and forces operating between the pressing/supporting bodies. The running of the working roller is impaired, and problems with reproducing working conditions can occur. The attempt has been made to counteract such disadvantageous effects by providing the beds of the bearings with elastic bolsters and deflection-controlled rollers. DE-U-296 19 695 suggests arranging the working roller so that it is displaceable in the contact position with three degrees of freedom, whereby a pressing body needs to be provided with a bearing bed with which the working roller meshes. A stationary backing or mating roller forms a drive roller to make possible the motional bearing of the pressing body in combination with the working roller. In the event of only a slight frictional force operating in the contact zone, in addition the working roller needs to be driven. Such a device achieves an automatic adjustment of the working roller to the operating conditions. In some cases, however, problems will occur with regard to reproducible processing results.
With yet another apparatus (U.S. Pat. No. 2,878,778) a web is fed between two pressure rollers. Each pressure roller is mounted on a pair of backing or mating rollers. One of the pressure rollers and the mating rollers are driven. The construction of the device is costly. The variety of rollers causes problems with regard to setting, reproducibility and cleaning.
3. Objects of the Invention
In contrast to prior art, the present invention has as its major object to alleviate said problems and to improve apparatus of the described type for processing material webs.
In particular, it is an object of the present invention to make such improvements with regard to simplicity of construction, assembly and servicability, adjustability, operational function and results, and system cleaning.
SUMMARY OF THE INVENTION
In an apparatus comprising a stationary backing or mating roller (the term mating roller being used in this context hereinbelow); a displaceable working roller arranged to press against the mating roller in a contact zone upon being charged with pressure force and having a smaller diameter than the mating roller, with the contact zone being continuous over a desired working width and allowing the web to pass through it; a pressing device including a pressing body with a pressing surface to engage the working roller on a peripheral area thereof which is on the roller's side opposite the contact zone; and a supporting element separated from the pressing body and having a support body surface to engage the working roller during the pressing operation; these objects are achieved in that the displaceable working roller is connected to a roller drive and forms a peripheral drive for the revolving mating roller, whereby the working roller in its driven and pressed-against position drives the material web through the contact zone, the supporting element, viewed in the direction of rotation of the working roller, is located in the area between the latter and the pressing body and the feed-in of the web into the contact zone is provided between the supporting element and the mating roller. An essential measure consists in the fact that the working roller, whose diameter is small in relation to the diameter of the mating roller, forms the direct motive source of the device in such a way that the mating roller is only made to revolve via the web without being self-propelled. The supporting element is provided on the side of the device facing the web feed-in, independent of the pressing facility/device, in the area between the latter and the mating roller. This arrangement of the supporting element in front of the contact zone helps the operation of the working roller, which can be moved in the direction of contact and essentially perpendicular to this, to remain stable. In addition propulsion by means of the small roller ensures a particularly quiet and stable operation of the rollers. Owing to the arrangement of the supporting element in combination with the self-drive of the displaceable working roller and the pick-up of the mating roller, dynamic effects are reduced on the supporting element. It is likewise advantageous that, viewed from the direction of rotation of the working roller, the peripheral area of the same remains free behind the contact zone towards the pressing facility. This makes assembly and cleaning considerably easier.
A particularly advantageous embodiment consists in the pressing body and the supporting element being constructed as an L-shape, when viewed in front sectional view, with flat sliding surfaces arranged at least approximately at right angles to each other. This arrangement is advantageously so provided that the lines of contact on the working roller, viewed from the direction of rotation of the roller and proceeding from the line of contact on the pressing body, come to lie at peripheral angle intervals of approx. 90°, 90°, 180°. This also allows an operation which is particularly low on wear and friction to achieve an optimum reduction of surfaces sliding against each other.
It is particularly useful, especially in connection with the aforesaid embodiments, that the axles of the working roller and mating roller lie on the same, at least approximately horizontal plane, the web runs from bottom to top and the working roller comes to lie at least with the greatest part of its own weight on the support body surface. It is useful for this device arrangement in particular that the pressing body is constructed as a plate which can be inserted and removed between the working roller and a pressure generating device of the pressing device on the side of the apparatus including the web delivery. It is particularly advantageous, too, if the pressing body is arranged so that is is displaceable with at least two degrees of freedom for applying pressure, while at the same time being supported on a stationary element between the pressure generating device and the working roller. Thus, operational positioning and motional stability are achieved for a broad spectrum of applications and settings.
Especially in combination with the horizontal arrangement of working roller and mating roller, the pressing body can usefully lie against the apex of the working roller, which is determined by the distance from the axle of the mating roller A=d+D/2, with d=the working roller diameter and D=the mating roller diameter. It is particularly a
Gerrity Stephen F.
Mattingly Stanger & Malur, P.C.
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