Winding – tensioning – or guiding – Convolute winding of material – With tearing or breaking
Patent
1996-10-03
1999-11-09
Nguyen, John Q.
Winding, tensioning, or guiding
Convolute winding of material
With tearing or breaking
242541, 242542, 242533, B65H 3510, B65H 1814, B65H 1826
Patent
active
059798181
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention refers to a surface rewinding machine and method for the formation of logs or rolls of web material wound on a central core. Such rewinding machines are well-known, described, for example, in U.S. Pat. Nos. 4,487,377; 4,723,724; 4,327,877 and 4,828,195; U.K. Patent No. 2,105,688; and in EP-A-0 498 039.
More in particular, the present invention refers to a rewinding machine which includes a first winder roller on which the web material is fed; a second winder roller defining, with the first winder roller, a nip through which the core and the web material pass; means for feeding the web material to said nip; means for introducing a core on which the web material is to be wound; and a web material severing means cooperating with said first winder roller.
BACKGROUND ART
A rewinder of this type is described, for example, in U.S. Pat. 4,487,377.
These rewinders are used for producing smaller-diameter logs or rolls of web material from large-diameter parent rolls. Typically, these machines are used in the paper converting industry to produce rolls of toilet paper, kitchen towels, all-purpose wipers and the like. The formed logs may be as long as 350 cm and only 10-15 cm in outer diameter, and are subsequently cut transversely to their axis to obtain small rolls which may be only 10-30 cm long.
In the production of such logs, it is important to use reliable machines able to run at high production speeds (in the range of 600-1000 m/minute) which provide a consistently high-quality product, with uniform windings, especially of the first loops. The length of the material on each log must be presetable and maintained, from log-to-log, with great accuracy.
One way to obtain high production rates and a high quality of the manufactured product is shown in U.S. Pat. 4,487,377, which provides for a web-cutting member which cooperates with the first winder roller of the rewinder. The web material is cut upstream of the point where the core is introduced. After cutting, the leading edge of the web material adheres to the surface of the winder roller and is transferred (by the rotation of the latter) towards the winding region where the leading edge is made to adhere to a new core suitably introduced by an insertion means.
This machine requires means (for holding the leading edge of the web material onto the winder roller) which are housed inside the winder roller and which must be timely activated and deactivated to hold and release the edge at preset moments, thereby allowing the starting of the winding on a new core.
In U.S. Pat. No. 4,327,877 a machine is described, wherein the web is torn between the core and the second winding roller once the core has been introduced into the nip. Tearing is obtained by a suction means inside the second winding roller. Said suction means forms a loop of web material which is pinced between the new core and the second roller.
OBJECTS OF THE INVENTION
A first object of the present invention is a rewinding machine which is able to produce a high-quality finished product at high speeds with a simpler and more economical construction than that of known rewinders. A further object of the present invention is to provide a versatile rewinder able to produce logs of varying length without requiring complex mechanisms for adaptation to different lengths of web material without a slipping of the web material on the winder roller onto which it is fed. Another object of the present invention is the construction of a rewinder having means for tearing or cutting the web material, which means are reliable, simple, and inexpensive to produce and maintain.
These and further objects and advantages will appear evident to the skilled in the art by the following description.
DISCLOSURE OF THE INVENTION
In the rewinder according to the present invention, a surface or track is provided upstream of the nip between the winder rollers, which defines, together with the web feeding means which feeds the web material into the nip, a channel into which the core is introduced. A
REFERENCES:
patent: 3123315 (1964-03-01), Couzens
patent: 4327877 (1982-05-01), Perini
patent: 4487377 (1984-12-01), Perini
patent: 4723724 (1988-02-01), Bradley
patent: 4828195 (1989-05-01), Hertal et al.
patent: 4856725 (1989-08-01), Bradley
patent: 4962897 (1990-10-01), Bradley
patent: 5137225 (1992-08-01), Biagiotti
patent: 5772149 (1998-06-01), Butterworth
Biagiotti Guglielmo
Perini Eva
Fabio Perini S.p.A.
Nguyen John Q.
LandOfFree
Rewinding machine and method for the formation of logs of web ma does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rewinding machine and method for the formation of logs of web ma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rewinding machine and method for the formation of logs of web ma will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1445475