Winding – tensioning – or guiding – Convolute winding of material – With particular material connection to take-up
Reexamination Certificate
1999-10-21
2001-12-04
Jillions, John M. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With particular material connection to take-up
C242S542300, C242S542400
Reexamination Certificate
active
06325320
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. § 119 of German Patent Application No.198 48 813.0, filed Oct. 22, 1998, 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 winding machine and process for winding a material web, in particular a paper or cardboard web, onto a reel, in which the material web is guided by way of a carrying drum that can be supplied with suction, and a hip formed between the carrying drum and the reel.
2. Discussion of Background Information
A winding machine of this kind has been disclosed, for example, in European Patent EP-B1-0 658 504, wherein a carrying drum is provided with internally supplied suction. A corresponding winding machine is used, for example, at the end of a machine used for producing or refining a material web. It can also be used for wrapping a winding roll that has already been completely wound. Such a machine can, for example, be a paper making machine.
In practice, problems can occur with the initial threading of the material web or a threading end or threading tip of this material web onto the winding device. Thus, until now, it has been customary to transport the threading end of the material web to the carrying drum, by way of threading ropes, blower plates, vacuum belts and/or the like, whereupon this threading end is guided around the carrying drum. Then, the threading end is removed from the carrying drum once more, by way of a doctor (scraper), e.g., a blowing doctor, a blowing wedge, or the like and by way of baffle, and is discarded into a rejects slusher. The paper web then widens out and is continuously discarded into the rejects slusher. For example, a baffle with a blower device can be provided for this purpose. Then, the material web is cut, by way of a gooseneck, band, knife, water jet, and/or the like and is threaded onto an empty reel that is provided. In this regard, an uncontrolled self-threading of the in particular strip-like threading end or the entire material web onto a provided empty reel or an already wound reel can occur. This problem occurs to a greater degree at high machine speeds and with grooved or bored carrying drums that are not supplied with suction.
In conjunction with a conventional winding machine
10
, there is shown in
FIG. 1
one such undesirable self-threading that deviates from the desired web path A. The web path B represents the case in which, immediately after the nip
18
formed between the carrying drum
12
and an empty reel
16
′, the strip-like threading end of the material web
14
, that is guided by way of the carrying drum
12
or the entire material web
14
is automatically wound in an uncontrolled manner onto the empty reel
16
′. The letter C represents the case in which there is an uncontrolled self-threading onto an already wound reel
16
. In contrast, in the desired web path A, the threading end or the material web
14
is first detached from the carrying drum
12
by a doctor
20
and is discarded into the rejects slusher
22
.
With a carrying drum that is supplied with suction, the guidance of the threading end, which is generally strip-like, or the material web is influenced all the way to the exit region at the doctor
20
so that in this instance, a self-threading onto the still empty reel
16
′ (instance B) can be prevented. Carrying drums are used for this purpose, that are connected to a vacuum source and are supplied with suction by one or both pins. In the frequently used drum embodiments, the inner chamber is supplied with suction without built-in elements. As a result, however, secondary air can now penetrate into the part of the carrying drum that is not wrapped around, which results in a relatively high energy consumption. Carrying drums with internal sealing have, among other things, the disadvantage that functional elements are disposed inside the carrying drum. The carrying drum must be removed, for example, in the event of a possible change of seals. All of the known embodiments have the disadvantage that a doctor device is also always required in order to remove the threading end or the paper web from the carrying drum.
SUMMARY OF INVENTION
The invention comprises a winding machine of the type mentioned in the Background, which permits a continuously reliable, controlled threading of the threading end of the material web while retaining the simplest possible construction.
This is attained according to the invention by providing the carrying drum with a perforated casing and/or with circumferential grooves. The drum is supplied with suction by means of at least one external suction box which is disposed with at least one suction opening opposite the circumference region of the carrying drum that is not wrapped by the material web. The suction box has at least one sealing element in the vicinity of this suction opening, which cooperates with the carrying drum.
Based on this embodiment, a definite web path is always assured, even with the initial threading of the strip-like threading end of the material web. Thus, an uncontrolled self-threading of the threading end or the entire material web onto an empty reel or a wound reel is prevented. The respectively desired web path is assured even at higher machine speeds. With the use of an external suction box, it is assured in any case that virtually no secondary air penetrates into the carrying drum, which results in a reduced energy consumption. A possible changing of the seals can be carried out in an extremely simple fashion. It is no longer necessary to remove the carrying drum for this purpose. In addition, the previously required additional doctor device can be eliminated. For example, a sealing element, in particular a strip-like sealing element, that is provided in the web exit region of the carrying drum can simultaneously be embodied as a doctor.
Correspondingly, in one embodiment of the winding machine according to the invention, at least one sealing element of the suction box is simultaneously embodied as a doctor.
In a suitable fashion, at least one sealing element is embodied as a sealing strip that extends laterally to the web travel direction. A respective doctor can then be provided in the form of a sealing strip of this kind.
A doctor that is embodied by a sealing element and is provided in the web exit region of the carrying drum can therefore be used to detach the material web guided by means of the carrying dram or a threading end of this material web once more from the carrying drum so that the previously required additional doctor device can be eliminated.
In one practical embodiment, the suction box is provided with sealing strips on the two longitudinal sides extending laterally to the web travel direction. Therefore, it is fundamentally also possible to seal the suction box on both ends by means of sealing strips that constitute doctors.
It is also advantageous if at least one sealing strip, which is provided in the web exit region and is simultaneously embodied as a doctor, can be pneumatically loaded. In so doing, the sealing strip can, for example, be pressed against the carrying drum by means of at least one compressed air hose or the like.
In one practical embodiment of the winding machine according to the invention, the sealing strip can be pivoted around an axis parallel to the drum axis, be supported on a side wall of the suction box, and can be acted upon in opposite directions by way of two compressed air hoses. In particular, different pressures can also be adjusted in this manner.
In one practical embodiment, the suction box extends laterally to the web travel direction at least essentially across the entire machine width.
The suction box can advantageously be acted upon with vacuum by means of an internal tube that is provided with suction openings and can be connected to a vacuum source. The internal tube can extend at least essentially across the entire machine width. The suction
Leitenberger Werner
Maurer Jorg
Moller Roland
Greenblum & Berstein P.L.C.
Jillions John M.
Voith Sulzer Papiertechnik Patent GmbH
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