Winding – tensioning – or guiding – Convolute winding of material – With tearing or breaking
Reexamination Certificate
1999-10-15
2001-12-11
Jillions, John M. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With tearing or breaking
C242S526100
Reexamination Certificate
active
06328248
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 198 48 814.9, 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 relates to a winding machine and a method for winding a material web, such as a paper or cardboard web, onto a reel-spool. The material web is carried over a support roll, and a winding nip is formed between the support roll and the reel-spool. Whenever the reel-spool is to be changed, the material web is weakened by being perforated by a weakening device positioned before the support roll in the web travel direction. The material web is then separated at the weakened point.
2. Discussion of Background Information
A winding machine to which the present invention applies is used, for example, at the exit end of a machine for producing or finishing a material web. However, it can also serve, for example, for rewinding a roll that has already been wound onto a spool. The machine can be, for example, a paper machine. Separation of the material web can take place in the web travel direction after (i.e., downstream of the nip formed between the support roll and the new reel-spool. After the separation has taken place, the new leading edge of the material web is positioned about and attached to the new reel-spool.
A winding machine of this type is disclosed in DE-U 295 08 732. The weakening device disclosed therein includes a perforating comb that can swivel around a stationary axle, as well as a stationary counter-holder opposite the comb. During normal operation, the perforating comb must thus be swivelled away from the stationary counter-holder, whereas for each weakening of the material web, the comb must be swivelled around the stationary axle towards the counter-holder. However, such an arrangement is not suitable for higher operating speeds.
A perforating core is also used for each weakening of the material web in a winding machine disclosed in WO 96/11868. In this known winding machine, the perforating core is plunged into the material web perpendicular to the plane of the web.
SUMMARY OF THE INVENTION
The present invention relates to a winding machine for winding a material web onto a reel-spool in which the material web is transported over a support roll and a winding nip is formed between the support roll and the reel-spool. For changing of reel-spool, the material web is weakened before the support roll in the web travel direction. The material web is then separated at the weakened point. The winding machine includes a rotatable perforating unit, the perforating unit provided with a plurality of one of cutting elements and perforating elements and a counter-holder is arranged on an opposite side of the web from the perforating unit, the perforating unit and the counter-holder are movable relative to one another to weaken the web.
The cutting elements can be formed at least partially by one of needles and small knife-points and the counter-holder can extend transversely to the web travel direction and can extend substantially or at least essentially across the entire width of the winding machine.
The rotatable perforating unit can include at least one rotatable perforating roll carrying the elements.
The perforating roll can have a longitudinal axis that extends transverse to the web travel direction, the perforating roll being rotatable around said axis.
Additionally, the perforating roll can extend substantially or at least substantially across the entire width of the winding machine.
Further, the rotatable perforating roll can be controllable driven so that, before a change of reel-spool, the perforating roll rotates at a pre-settable rotation speed.
The pre-settable rotation speed of the perforating roll can be selected so that the circumferential speed of the perforating roll is at least substantially the same as a web speed.
Additionally, the perforating roll and the counter-holder are movable relative to one another such that, for each weakening of the material web, the cutting elements of the perforating roll, rotating at the pre-settable rotation speed, engage or plunge into the material web.
The cutting elements of the perforating unit can be arranged at least partially in a row that is oblique with respect to an axis of the perforating unit.
In the alternative, the cutting elements of the perforating unit can be arranged at least partially in an arrow-shaped row.
Moreover, the cutting elements of the perforating unit can be arranged at least partially in one of several adjacent arrow-shaped rows and zig-zags and the direction of the arrow-shaped rows can be parallel to the web travel direction.
Also, the cutting elements of the perforating unit can be arranged at least partially in a straight row running transversely to the web travel direction.
The perforating roll and the counter-holder can be movable relative to one another so that for each weakening of the material web, cutting elements are engaged with (plunged into) the material web during only one revolution of the perforating roll.
The counter-holder can extend transversely to the web travel direction and can have a plurality of recesses along the length of the counter-holder, the recesses being separated from one another by bridges extending in the web travel direction, with the cutting elements of the perforating unit extending into die recesses.
The counter-holder can include a mating roll extending transversely to the web travel direction and having a number of circumferential grooves distributed along the length of the mating roll, with the cutting elements of the perforating roll unit extending into the grooves.
The rotatable perforating unit can include at least one perforating wheel carrying the elements and the perforating wheel can be displacable along the material web transversely to the web travel direction.
The cutting elements of the perforating wheel can be arranged in a circumferential direction of the perforating wheel.
The cutting elements can be uniformly distributed over the circumference of the perforating wheel.
Further, a rotational axis of the perforating wheel can extend substantially in a plane parallel to a plane of the passing material web.
Moreover, a rotational axis of the perforating wheel can extend substantially parallel to the web travel direction.
On the other hand, a rotational axis of the perforating wheel can extend obliquely to the web travel direction.
The rotational axis of the perforating wheel can be set obliquely, so that when the perforating wheel has been moved over the running material web transversely to the web travel direction a substantially straight lengthwise cut is produced by each cutting element of the rotating perforating wheel.
The counter-holder can extend transverse to the web travel direction and can include a continuous groove that extends transverse to the web travel direction, the cutting elements of the perforating wheel extending into the groove.
The counter-holder can be swivelable towards the perforating unit or the perforating unit can be swivelable towards the counter-holder.
Separation of the material web can be at least assisted by blown air or separation of the material web can be at least assisted by a double-sided adhesive tape that is introduced into the winding gap.
The reel-spool can be provided with suction apertures to assist in the separation of the material web.
At each change of reel-spool, the new reel-spool can be positioned in a space between the support roll and the wound roll of web material on the old reel-spool.
Further, at each change of reel-spool, the new reel-spool can be arranged generally above the support roll.
The support roll can be mounted at a fixed position or the support roll can be a movable pressing roll.
The present invention also relates to a method for winding a material web onto a reel-spool in a winding machine wherein the web material is transported over a support roll
Greenblum & Bernstein P.L.C.
Jillions John M.
Voith Sulzer Papiertechnik Patent GmbH
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