EP0044814A1 - Machine for forming rolls from a web of paper - Google Patents

Abstract

1. Machine for forming rolls from a paper band (4) comprising at least one receiving mandrel, means for rotating this mandrel in a first position, in order to form a roll, a cutting device (5-7) for cutting the paper band (4) when the roll has reached the desired size and a distributor (9, 16, 17) of adhesive pieces (18) for attaching the terminal edge of the band (4) to the last layer of the roll, characterized in that the machine comprises devices (1) intended to transport the roll having reached the desired size from said first position (3) to a second position (31), adapted in such a way that the paper band (4) crosses the cutting device when the roll is in this second position (31), the machine comprising a mechanism for rotating the roll in this second position after the cutting of the paper band, this mechanism comprising a driving roller (15) adapted in such a manner that it presses against the external layer of the roll, and being driven over a predetermined angle in order to bring the terminal edge of the band of the considered roll in a superimposed position with the last layer of the roll and facing said distributor.

Description

Machines are already known for forming rolls from a strip of paper comprising at least one receiving mandrel and means for driving this mandrel in rotation to form the roll, means for cutting the strip of paper upstream from the roll when it has reached the desired dimension.

When a roll is finished, it is necessary to fix the end edge of the paper strip to the last layer of the roll, to prevent the strip from unwinding after handling the roll. This fixing operation can be easily done by gluing, when the roller is constituted by a single wound strip. On the other hand, when the roller comprises several superimposed strips, wound simultaneously, a simple point of glue is not enough and it is necessary to fix the end of the external strip to the last turn formed by this strip, by means of a small piece of sticky or adhesive paper. This operation is carried out by hand and it results in a loss of time which slows down the production rate of the roll making machine. This loss of time is particularly noticeable when the machine is provided to simultaneously form a series of rollers, placed coaxially on drive means. It is indeed necessary to successively fix the end edge of each of the windings formed before being able to unload the machine from the finished rollers and then form a new series of rollers.

The object of the present invention is to increase the productivity of a machine, by reducing as much as possible the time necessary for fixing the rollers.

To this end, the machine which is the subject of the invention is characterized in that it comprises a mechanism for driving the roller in rotation after cutting the strip of paper; this mechanism being constituted by a roller arranged so as to bear against the outer layer of the roller and driven by a determined angle to bring the bor: end of the strip of the roller considered in position superimposed on the last layer of the roller and facing a dispenser of sticky coins arranged to apply a coin on the roll in order to fix the end edge of the strip to the last layer of the roll.

The single figure of the accompanying drawing shows schematically and by way of example an embodiment of the terminal part of the machine which is the subject of the invention.

Roll forming machines are well known in themselves and include supports for one or more large diameter rollers, as well as means for slowing the rotation of these rollers, in order to obtain a regular tension of the strip which is unwound to wind on small diameter rolls. The machine may also include devices for cutting the strip delivered by a feed roller and thus obtain several parallel strips of smaller width. Such machines are used in particular for making paper rolls for cash registers, telex devices, calculating machines, etc.

With reference to the drawing, the terminal part of the roll forming machine comprises a mandrel holder 1, capable of rotating around a shaft 2 and provided with two rotary rods 3 and 3 'on which the mandrels which are cardboard tubes constituting the hollow central support of a roll. The means for driving these rods 3 and 3 'in rotation are not shown, because they are well known in themselves.

During operation of the machine, a strip of paper 4, which may consist of several superimposed layers, is wound on the mandrel carried by the rod 3, while the mandrel holder is stationary. When the rollers have reached the desired diameter, a mechanism causes the mandrel holder 1 to rotate by ½ turn and the formed roller occupies position 3 '. During this rotation during which the roll formed is always integral with the strip 4, an end portion of this strip comes to occupy the position 4 'in which it rests on the mandrel of the roll to be formed and extends above a rail 5 of a cutting device, this rail 5 has a rectilinear groove 6 in which a cutting roller 7 engages and moves to cut the strip or strips passing over this rail. This cutting device is not part of the invention and is therefore not described in detail.

The terminal part of the machine includes a device for terminating the rollers. Device which enables an adhesive label or any sticky piece to be placed on the terminal edge of the tape roller. To this end, this device comprises a frame constituting a receptacle for strips of self-adhesive labels carried by a support strip 9, originally, this support strip forms a roller 10 simply placed in the bottom of the receptacle 11. The frame 8 carries an oscillating arm 12, articulated at 13 and subjected to the action of a jack 14 for controlling its pivoting, this arm 12 carries at least one roller 15 capable of being driven in rotation by an angle determined by a motor not shown.

Above this roller 15 is a spout 16 over which the support strip 9 passes at an acute angle, before engaging with a toothed drive drum 17 which is driven by a stepping motor device. Due to the acute angle formed by the support strip 9 on the spout 16, each adhesive piece detaches itself from the support strip. The drawing shows a coin 18 in the process of detaching and arriving near the periphery of the roller carried by the rod 3 '.

• - Lorsque le rouleau est terminé et arrivé dans la position 3', le vérin 14 est commandé par des moyens non représentés pour appliquer le galet 15 contre la périphérie de ce rouleau, de façon à maintenir la dernière couche du rouleau appliqué contre le corps de celui-ci. Le dispositif de coupe est ensuite actionné de sorte que la partie 4' de la bande est coupée en 2.

The operation of the device is as follows:

• - When the roller is finished and arrived in position 3 ', the cylinder 14 is controlled by means not shown to apply the roller 15 against the periphery of this roller, so as to maintain the last layer of the roller applied against the body of this one. The cutting device is then actuated so that the part 4 ′ of the strip is cut in 2.

The portion bearing on the mandrel by the rod 3 is taken by means not shown and known to be held on the mandrel of the roll to be formed. The roller 15 is driven by a determined value, which rotates the roll formed to complete the winding thereof. When the end edge of the strip comes opposite the spout 16, the drum 17 is driven by a value corresponding to the distance separating two coins 18 on the support strip 9, so that the coin 18, in the process of detachment, comes to be applied partially on the terminal edge when entering it. The roller 15 still continues its rotation by a value sufficient for the end edge with the piece 18 to pass between this roller and the formed roller, which applies this piece 18 to the peripheral layer of the roller which is then finished. The jack 14 is then actuated to move the roller 15 away from the roll formed and thus allow the unloading of the machine. The user can then replace on the rod 3 'new mandrels which are thus ready to receive future rollers.

It should be noted that as soon as the cutting device has cut the strip 4, the mandrel mounted on the rod 3 can be rotated to form a roller. This operation can therefore be carried out at the same time as the operation for fixing the strip of the finished roll or rolls takes place.

In the foregoing description, the formation of a single roller has been explained, but it goes without saying that the machines for the manufacture of rollers are generally provided for the simultaneous manufacture of coaxial rollers and that therefore it is necessary that the device for fixing the end of the strip to a roll also comprises a series of support strips 9, so that all of the finished rolls can receive their adhesive fixing label at the same time.

It is of course possible to provide many variants and the device delivering the coins 18 could be of any suitable type. In particular, it could include a sizing device for non-adhesive plain paper fixing pieces.

According to an advantageous variant, the roller 15 - could be mounted to rotate directly on the frame 8, the latter then being displaceable by translation or by pivoting so as to be distant and respectively approaches the roller in position 3 ′ in this way, the distributor of tabs or labels 18, as well as the roller 15 can always be brought into a correct position relative to the roller in position 3 ', regardless of the diameter of the latter. The stopping position of the assembly could be determined by the abutment of the roller 15 against the roller itself.

When a machine is intended for the production of rollers which always have the same diameter, it is clear that the roller 15 and the distributor of tongues could be mounted stationary on the machine.

Claims (4)

1. Machine for forming rolls from a strip of paper comprising at least one receiving mandrel and means for driving this mandrel in rotation to form the roll, means for cutting the strip of paper upstream of the roll when the latter ci has reached the desired dimension, characterized in that it comprises a mechanism for driving the roller in rotation after cutting the strip of paper, this mechanism consisting of a roller arranged so as to bear against the outer layer of the roll and driven by a determined angle to bring the end edge of the strip of the roll considered in position superimposed on the last layer of the roll and facing a sticky dispenser arranged to apply a piece on the roll in order to fix the end edge of the strip to the last layer of the roll. 2. Machine according to claim 1, charac- terized in that the roller is mounted on an oscillating arm capable of occupying a position spaced from the roller and respectively a position in which it comes into contact with the roller. 3. Machine according to claim 2, characterized in that the dispenser comprises drive means for a support strip for adhesive pieces and guide means for bringing this support strip to a spout disposed near and in upstream of the point of contact between the paper roll and the drive roller, the support strip making an acute angle on this spout, so that the small pieces detach themselves from the support strip when it passes over the spout , the distributor drive means being controlled in synchronism with the drive roller to bring a coin, during detachment, in contact with the end edge of the roller strip. 4. Machine according to claim 1, characterized in that the roller and the coin dispenser constitute a movable assembly capable of being moved away from and respectively close to the roller to bring the roller into contact with the periphery of this roller and the distributor. of coins, in the appropriate position to apply a coin on the roller.

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