Winding – tensioning – or guiding – Convolute winding of material – With feeder
Reexamination Certificate
1999-10-21
2001-11-06
Jillions, John M. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With feeder
C242S541300, C242S541700, C242S542300, C242S542400
Reexamination Certificate
active
06311921
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No.198 48 816.5, 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 present invention concerns a winding device and a method for winding a material web on a reel. The winding device includes a feed roll, a carrying frame, e.g., a carrying drum and a perforated support belt, and a reel upon which the material web is wound. A vacuum may be applied to hold the material web to the carrying fame. The method of the present invention relates to introducing the material web over a feed roll, guiding the material web by a perforated support belt over a suction carrying drum, and forming a winding nip (gap) between the carrying drum and a reel upon which the material web is wound.
2. Discussion of Background Information
EP-Bl-0 658504 discloses a winding device having a carrying drum with internal suction. The winding device may be used at the end of a machine for producing or refining a material web or may be used to rewind an already wound roll. Such a machine may be a paper machine. During operation, problems may occur particularly when the material web or a leading end of the material web, also referred to herein as the threading tip, is fed into a winding arrangement. Thus, it is conventional to have lead cables, blow plates, vacuum belts, and/or the like to transport the leading end of the material web to the carrying drum, after which the leading end may be guided around the carrying drum. Then, a doctor blade, such as a blow doctor, may remove the leading end of the material web from the carrying drum, and the leading edge may be guided with a blow wedge or the like, or may be diverted with a guide plate, into a pulper. The paper web is then broadly and continuously diverted into the pulper by, for example, a guide plate with a blower. Thereafter, the material web may be separated, i.e., cut, with a gooseneck, belt, knife, water jet, and/or the like and guided onto an empty reel which is made available. Sometimes the automatic feeding of the special strip-type leading end or of the entire material web on an empty reel or on an already wound roll may become uncontrollable. This often occurs with higher machine speeds and with grooved or perforated carrying drums, which are not provided with suction.
FIG. 1
depicts a prior art winding device
10
. In device
10
, a winding nip (gap)
18
is formed between carrying drum
12
and an empty reel
16
′; three web paths, A, B and C are shown, with path A being desired and paths B and C being undesired. In desired web path A, the leading end of material web
14
is first released from carrying drum
12
by a doctor blade
20
and diverted into pulper
22
. In web path B, the strip-type leading end of material web
14
or the entire width of material web
14
is guided over carrying drum
12
and wound directly downstream from winding nip (gap)
18
in an incontrolled manner upon empty reel
16
′. In web path C, there is uncontrolled automatic feeding onto an already wound reel
16
.
By providing a vacuum in carrying drum
12
, the guidance of the usually strip-type leading end of the material web or the material web itself is controlled up to a discharge zone where a doctor blade
20
is provided so that automatic feeding upon empty reel
16
′ (web path B) may be avoided However, with a vacuum in the carrying drum, the web pickup by the doctor blade is made more difficult, and the material web may possibly feed in an uncontrolled manner onto a wound roll as in web path C.
Also, it is problematic in the known designs to have the web removed from a carrying drum with a coated surface (e.g. SiC), soft coating, and/or surface structures, such as, in particular, ridges, V-shaped grooves, or the like, because doctor blade contact is not possible. The leading end, i.e., the threading tip of material web
14
, or the entire width of material web
14
, must then be freed from the carrying drum with a blow knife, which also makes guidance of the web into the pulper more difficult. Moreover, with internal vacuum carrying drums whose interiors are completely subjected to a vacuum, it is possible for air to inadvertently penetrate into the part of the carrying drum not contacted by the web, which results, in particular, in relatively high energy consumption. On the other hand, carrying drums with inside seals have the disadvantage that the carrying drums have to be dismantled in order to change seals.
SUMMARY OF THE INVENTION
The present invention provides for a winding device in which the leading end of the material web or the material web is reliably guided independently of the respective position of the empty reel and in which the web material is reliably removed from the carrying drum regardless of the specific nature of its surface.
In the present invention, the carrying drum is provided with circumferential ridges and/or a perforated jacket which is subjected to an external vacuum in a circumferential region not contacted by the perforated support belt and the material web. Preferably, the leading end or the material web is supported by the support belt and fixed thereon by a vacuum from the interior side of the support belt.
In accordance with the present invention, the material web or its leading end or point is fixed continuously with a vacuum which is provided from the vicinity of the feed roll to the vicinity of the discharge roll, which is near the pulper, thus virtually eliminating uncontrolled automatic feeding. Without the necessity of a doctor blade, the support belt, reliably removes the web from the carrying drum. Since a vacuum fixes the material web on the carrying drum, a certain web tension may be present upstream from the winding device even with low nip pressures between the carrying drum and the reel. Since an external vacuum is applied to the carrying drum, the carrying drum does not need internal sealing fittings. Thus, it is not necessary to disassemble the carrying drum in order to change seals. Also with an external vacuum, it is now possible to apply a combined vacuum to the feed section, carrying drum, and discharge section. For example, with an appropriate external vacuum box, it is possible to provide a vacuum over the entire circumferential perforated surface of the carrying drum, thereby reducing the overall amount of vacuum to a minimum. With a corresponding support belt change, the respective winding characteristics are modifiable if necessary.
In an exemplary embodiment, the support belt comes into contact with the feed roll which is wound by the material web. The support belt picks up the material web in the region of the feed roll and may wind the feed roll in the pickup vicinity.
To improve the winding characteristics, the carrying drum and/or the support belt may have a structured surface. The structured surface may include a surface that has raised portions and recessed portions, a surface that has raised nodes that are spherical or cubical, or a surface that is channeled, corrugated, ribbed, grooved and the like. Preferably, the structured surface may have V-shaped grooves and/or the like.
Preferably, the support belt is a thin, flexible belt which is provided with a surface adapted to the surface of the carrying drum.
In principle, the support belt may be a cut support belt which is provided with a connecting seam as in drying wires or may be a continuous support belt. However, in the latter case, appropriate precautions must be taken to replace the belt. The support belt may, for example, have winding characteristics determined by hardness, by the modulus of elasticity, by roughness, and/or the like. In particular, the carrying drum may have perforations or alternatively may have both perforations and surface structures such as V-shaped grooves and/or the like.
In all exemplary embodiment of the winding device according to the present invention
Leitenberger Werner
Maurer Jorg
Moller Roland
Greenblum & Bernstein P.L.C.
Jillions John M.
Voith Sulzer Papiertechnik Patent GmbH
LandOfFree
Winding device and method for winding web material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Winding device and method for winding web material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Winding device and method for winding web material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2606343