Arrangement for Web Winding

The invention relates to an arrangement for web winding on a roll core or the like in a support drum winder, which comprises a first and a second support drum, a web cutter, transfer means for the transfer of a complete roll from the support drums, supply means for a new roll core and guide and retainer devices for governing said web until a supplied core retains said web against said first drum.

In the following specification and claims, the concept "first support drum" refers to that support drum, together with which the roll forms the first roll nip in the running direction of the web.

An arrangement is known from the British Patent Application No. 2 065 081, in which the new roll core is moved above the drums and in a channel between the support drums. The roll core is provided with a glue stripe along a mantle line. As a result hereof, the core must be supplied precisely oriented in the channel. This is cumbersome to carry out and requires high precision devices. The control of the web front end is questionable after the web cutting, also. The web front end can easily slip down between the support drums, which causes expensive halts in the winding process. The known arrangement requires further several operative devices, the functions of which must be synchronized mutually.

The object of the invention is to remove the problems described earlier by providing an arrangement, which guaranties in an uncomplicated way a secure and a profitable function of the equipment. An improvement object is to form a supply measure in which it is not necessary to move the supply means all the way into the winding position for a roll core supply therein. An uncomplicated web retainment in the winding position prior a new winding process is a further object.

The characteristics of the invention include that during the transfer of the complete roll, the new roll core is freely supplied from a location above the support drums in a position therebetween. The supplied core retains the generated web end, which is formed by the engagement of the cutter and the web, against the first support drum, and so the usual retainer devices can be deactivated. As this supply mode is not sensitive to any orientation generated by a rotation around the roll core axis, the free fall supply can be exploited to drop or to throw the new core between the drums. Retainer devices include members which are separate from the first drum and generate a force action against this drum.

By rotatably supporting the core supply means and the web cutter to a movable support arm of the transfer means, to which arm the pusher roll or drum is supported, the thrust against the complete roll and the web cutting are possible by means of the same operative device. This fact has a great importance in view of the production costs of the arrangement. Roll core supply means can be combined with the web cutter. Hereby it is possible to carry out by a common actuator device the delivery of the new roll core in to a supply location, from which it is freely supplied to the position between the drums. This device can, for instance, be a work cylinder, which by a suitable way is connected to the support arm. An actuator member can be in association of the pusher, the cutter and the supply means. This actuator governs the proper sequence of complete roll removal, web cutting and core supply. A simple form of the actuator member is a roll contacting bar connected to the outside of a core trough, which is attached to a hollow, cylindrical cutter, both being rotatable around the pusher.

A favourable supply device is possible by providing the supply trough with a releasable locking, for instance, with a pinch grip know per se, by the release of which the core is dropped in the cuneate position between the support drums.

After the cutting, the governing of the web front end can be secured according to the invention with air jets by bending and/or forcing the web against the first support drum during the supply of the new core. A separate retainer member is further applied for the web retaining, for instance, a bar-like retainer or another air nozzle, the air jets of which is directed mainly perpendiculary against the web.

By supporting the cutter and the core supply means to a support arm, the motion path of which is concentric with the first support drum, the construction of the arrangement is easily kept uncomplicated.

It is favourable to attach by attachment material like glue, after the web cutting, the trailing end of the complete roll to the surface of the complete roll and the new leading end of the web to the new roll core. This is possible by arranging attachment material supply means like glue applicators, in the web running direction prior the retainer member, for a supply on a web surface area, which is free from a contact with the first support drum. The function of these supply means should hereby be so arranged, that sized areas are formed at both sides of the generated cutting position located in an unsized area so, that at least one sized area is near the new front portion and at least a corresponding one is in the complete roll near the trailing end portion. Supply means can be applicators located permanently in a row, which is arranged across the web. Attachement stripes can be located at intervals of 150 mm in this transverse direction.

The invention is described in the following with reference to the attached drawing, in which FIGS. 1-4 show process stages of a complete wound paper roll and a new roll core during the core replacement.

Reference numeral 1 in the drawing refers to a paper web and 2 to a complete wound paper roll. The actual winding around a core 6a is carried out by means of support drums 3,4 and a rider roll 5 is known per se. For initiating a new winding, the arrangement comprises a new core 6b located in a core trough 7. Core trough 7 is provided with a releasable locking means, for instance a pinch grip, by which core 6b is locked in trough 7. Core trough 7 is operationally connected to a movable support arm 8, at which is also supported a rotatable cylinder-like pusher roll, tube or drum 10 and a web cutter 9. The motion of support arm 8 is arranged by a known way, for instance, by means of a work cylinder 24. Cutter 9 is a trough-like member, which comprises a lever 23 which in the initial roll transfer stage is arranged to touch roll 2. Cutter 9 partly surrounds pusher 10. Along with the motion of pusher 10, the interaction between lever 23 and roll 2 is further transmitted to the actual cutter blade, for instance by arranging the cutter to rotate relative to pusher 10. This lever 23 governs the proper sequence of pushing roll 2, cutting web 1 and, when no obstructions will hinder a core supply, the supply of new core 6b. The embodiment of lever 23 shown in FIGS. 1-4 operates in association with a rotatable cutter cylinder, the two extreme rotation positions are obvious in FIGS. 3, 4. At the opposite side of the complete roll is located a descender 22 for the reception of complete roll 2, when roll 2 is pushed away from drums 3,4. The arrangement comprises pneumatic guide devices like nozzles 11a and 11b which are connected to a lift device 12 of rider roll 5 and a third pneumatic guide device 13. The latter guide device 13 is operationally connected to a retainer 14 of web 1. Instead of the bar-like retainer 14, one can alternatively apply for the retaining of web 1 an air nozzle 14a, the air jet of which is directed mainly perpendicularly against the cut web, and thus, forces the web against first support drum 3. The situation shown in FIG. 1 corresponds to the final phase of a winding carried out around core 6a, whereby drums 3 and 4 are stopped. For the cutting of web 1, for pushing away roll 2 which is detached from web 1, and for the supply of new core 6b between drums 3,4, support arm 8 along with operative members supported thereat is rotated in the direction of the arrow A. For the disengagement of rider roll 5 from roll 2, lift device 12 is moved in the direction of the arrow B. In order to prevent web 1 during the cutting from being detached from the mantle of drum 3 and, thus, eventually slipping between drums 3,4 under the arrangement, web retainer 14 is brought vertically in contact with web 1 so, that this is firmly against drum 3. This retainment can also be carried out by an air jet of nozzle 14a. An air jet arranged from nozzle 13 supports and bends the new front end of web 1, as described later on.

FIG. 2 shows the situation just after the cutting of web 1, whereby pusher 10 has pushed roll 2 away from drum 3. A trailing portion 1a of the wound web and a new leading portion 1b of web 1 are generated by the cutting of web 1. An air jet 15 is initiated in a position between drums 3 and 4 and roll 2 by pneumatic guide device 13, for instance a nozzle, which is moved between drum 3 and 4. A portion of jet 15 is directed between drums 3 and 4 and roll 2, at the same time bending leading portion 1b of the web towards drum 3. The attachment of web trailing end 1a to roll 2 can in this embodiment be carried out by an arrangement known per se, for instance by staples or by a sticker tape.

Roll 2 is moved in to descender device 22 in FIG. 3. At the same time, core trough 7 is rotated around pusher 10 so that, after the release of the pinch grip, core 6b is freely dropped between drums 3 and 4 to be supported by them. For an effective forcing of leading portion 1b of web 1 against drum 3, air jets 15 are produced by guide device 13. Roll pusher 10, web retainer 14 and the function of nozzle 14a are returned to one's initial position as shown in FIG. 1. Rider roll 5 is lowered into contact with core 6b, after which the winding of web leading portion 1b around core 6b is initiated. The guiding of web leading end is carried out by rider roll 5, and by jets 16 and 17 of nozzles 11a and 11b and jets 15 of nozzle 13 so that jets 15 and 17 are activated prior to starting operation of the machine at crawling speed and, after the crawling speed operation is started, jet 16 is also activated. Thereby leading portion 1b is easily guided tightly around core 6b through the nips in the winding position.

FIG. 4 shows another embodiment for the guiding of leading portion 1b of web 1 around new core 6b. Reference numeral 18 refers to permanent glue nozzles set in a row. During the crawling stage of drums 3 and 4, glue stripe groups 19 and 20 are sprayed on web 1 before the cutting of this. Stripe groups 19 and 20 are located at different sides of the future cutting position 21 of web 1, so that group 20 forms the attachment of trailing portion 1a of complete roll 2 to roll 2 and leading portion 1b is attached to new core 6b by group 19. A single stripe in group 19 and 20 is directed along web 1, so that neighbouring stripes in the same group are at distance of about 150 mm in the transverse direction of web. In this embodiment of the arrangement a protective device can further be applied, by which one prevents drum 3 being stained by glue. A short unsized portion of the web is located between stripes 19 and 20, so that cutting portion 21 is without cutter blade staining glue.

The invention is not limited to the embodiment shown but several modifications thereof are feasible within the scope of the attached claims. The embodiment according to FIG. 4, for instance, can be provided by a member functionally corresponding air nozzle 11b shown in FIG. 3.