Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1991-08-27
1994-02-22
Stodola, Daniel P.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
B65H 1920
Patent
active
052880346
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP90/00362 filed 6 Mar. 1990 and based, in turn, upon German national application No. P39 07 136.7 filed 6 Mar. 1989, under the International Convention.
FIELD OF THE INVENTION
The invention relates to a system for joining the end of a web of material running off a first winding roll with the initial portion of a web of new winding roll replacing the first. More particularly the invention relates to a system for joining the end of a web of material running off a first winding roll with the initial portion of a web of a new winding roll having means for severing the running off web, for holding the thus-created web end and for pressing the web end against the outer circumference of the new replacement winding roll, in order to achieve an adhesive bond.
BACKGROUND OF THE INVENTION
In unwinding machines for winding rolls of webs of material, e.g. paper or cardboard webs, splice devices are known which join the end of a web of material running off towards a processing machine with the web beginning of a new roll. If the machine comprises stationary fastening devices for the winding rolls, then in stationary processing machines the roll remnant is cut off, the separated end of the running off web is held tight and, after the roll remnant has been removed and a new winding roll has been inserted, it is fastened, e.g. glued, to the new roll.
For the automation of the splice process, the German Pat. No. 14 40 107 proposes a generic device comprising a storage device for storing the material of the running web of material, a cutting device for the separation of the running web and between the cutting device and the storage device a driven suction roller which receives a part of the stored supply of web material bringing it in pressure contact with the outer circumference of a new roll, in order to achieve an adhesive bond with the initial portion of the new roll provided with an adhesive strip.
The suction roller is mounted on a swivel arm whose fulcrum is located above the maximum outer diameter of the new roll and which extends substantially horizontally when in the rest position. The construction of the therein described device is expensive because for the clamping of the running web, the movements of the storage device, the rotating and swinging motions of the suction roller, for the cutting device and for turning on the suction air, separate drives are required for each of these operations. Besides, the cutting blade has to be separately removable from its cutting position, since it is in the path of the running web during its unwinding. These necessary drives require an expensive control unit. Furthermore, this device is less suitable for use in drum-type unwinding machines arranged immediately upstream of roll-cutting and winding machines.
OBJECT OF THE INVENTION
It is the object of the present invention to provide a device of this kind which can be used even in conditions of reduced space, with the lowest possible expense from the point of view of construction and control techniques.
SUMMARY OF THE INVENTION
This object is attained in an apparatus which comprises a splice element which can come to rest against the running off web and is movable outside the range of a full winding roll and can be pressed against its outer circumference, this splice element comprising a web-cutting element and a holding element, which when pressed against the running off web is located behind the web cutting element in the direction of the web travel.
According to the invention, the elements for cutting the unwinding web, for holding the so-created end portion of the web and for pressing it against the outer circumference of the new replacement web are incorporated in a single splice element, thereby reducing the expense for its construction, e.g. by reducing the number of drives.
A further advantage of the device according to the invention is the fact that it can be used in unwinding machines with various discharge directions of
REFERENCES:
patent: 3780960 (1973-12-01), Tokuno et al.
patent: 3939031 (1976-02-01), Takimoto
patent: 4681274 (1987-07-01), Thievessen et al.
patent: 4705226 (1987-11-01), Goetz
patent: 4892263 (1990-01-01), Beisswanger
Meyer Runald
Most Egbert
Schonmeier Herbert
Thievessen Karl
Weis Manfred
Dubno Herbert
Jagenberg Aktiengesellschaft
Kateshov Yuri
Nguyen John Q.
Stodola Daniel P.
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