EP1075910A1 - Machine for cutting paper logs - Google Patents

Abstract

The cutter (10) for separating paper rolls (14) into shorter lengths has guides (12) for the roll which is moved axially with respect to a circular saw blade (18). The blade is mounted on an arm to allow pivoting between retracted and cutting positions. A feed mandrel for the roll has an arm to support the pin (32), which fits into the bore in the centre of the roll (28). The mandrel can be retracted to allow removal of the cut sections.

Description

The present invention relates to a machine for sawing a paper roll, especially a roll without central chuck.

The invention aims in particular to allow the production of large series of rolls, from a main roll of long axial length, each of which has no mandrel central, or is provided with a mandrel but not very resistant to the crash.

Thus, each roll is constituted by the winding continuous of a sheet of paper, for example cotton wool cellulose, the center or core of the roll being constituted by a cylindrical central hole, opening axially at both ends, in particular in order to allow for example the unwinding the roll from the center when there is no mandrel, or after the mandrel has been removed.

We first form a main roll of large length, also called "log" which is then cut, by example by sawing, to cut it successively in one series of smaller length rollers.

During this cutting operation, by sawing or by cutting, the roller is subjected to forces significant transverse which can lead to deformation of the roller resulting from a crushing phenomenon, this deformation which could prevent normal use of the roller, for example by making its central unwinding impossible. The same problem can arise when the flexible mandrel does not offer not sufficient resistance to crushing.

Such overwriting can also make it impossible to mounting the paper roll in a user device in which the roller is mounted rotating about an axis which should normally pass through its central hole.

The invention aims to provide a machine improved for cutting, in particular by sawing, a roll of paper which overcomes these disadvantages and which can be integrated into a large production facility series of paper rolls.

To this end, the invention provides a machine for cutting a roll of paper into smaller rolls length, of the type comprising guide means in axial translation of the roller, drive means in axial translation of the roller to move it opposite the cutting means by means of a side saw capable to move transversely between a retracted position and a sawing position in which it cuts completely a free front axial end section of the roller, characterized in that it comprises a spindle removable, support and shape-keeping section front axial end when cut, which is likely to occupy an active position in which, with a view to cutting, it is introduced, at least partially axially in the central cylindrical hole of the roller, and a position of rest to allow evacuation of the cut section and for allow movement in advance, back and forth, roll for cutting a new section.

• la broche comporte au moins une partie expansible radialement entre un état rétracté dans lequel son diamètre extérieur est nettement inférieur au diamètre interne du trou central du rouleau de manière à faciliter son introduction et son extraction axiale dans et hors du trou central, et un état expansé dans lequel la broche est reçue avec serrage radial dans le trou central du rouleau.
• la broche expansible est une broche gonflable pneumatique ou hydraulique ;
• la broche expansible est une broche mécanique ;
• la broche comprend une partie fixe de faible diamètre à l'extrémité de laquelle sont montés articulés une pluralité de branches mobiles entre une position rétractée et une position active expansée dans laquelle elles assurent un serrage radial ;
• la broche est montée mobile en translation axiale dans les deux sens entre sa position active et sa position de repos ;
• en position de repos, la broche est dégagée par rapport au tronçon découpé de manière à permettre l'évacuation de ce dernier par poussée axiale du fait de l'avance du rouleau ;
• la machine comporte des moyens d'évacuation transversale du tronçon découpé à l'issue de son avance sous l'action de poussée qui lui est appliquée par le rouleau ;
• la broche est montée sur un support pivotant, de telle sorte qu'après la découpe, elle entraíne l'élément tronçonné vers son évacuation
• en position active de la broche, l'extrémité axiale arrière de la broche est située à proximité immédiate du plan de découpe.

According to other characteristics of the machine:

• the spindle comprises at least one radially expandable part between a retracted state in which its outer diameter is significantly less than the internal diameter of the central hole of the roller so as to facilitate its introduction and its axial extraction in and out of the central hole, and an expanded state in which the spindle is received with radial clamping in the central hole of the roller.
• the expandable spindle is an inflatable pneumatic or hydraulic spindle;
• the expandable spindle is a mechanical spindle;
• the spindle comprises a fixed part of small diameter at the end of which are articulated a plurality of movable branches between a retracted position and an active expanded position in which they ensure radial tightening;
• the spindle is mounted movable in axial translation in both directions between its active position and its rest position;
• in the rest position, the spindle is released relative to the cut section so as to allow the evacuation of the latter by axial thrust due to the advance of the roller;
• the machine comprises means for transversely discharging the section cut at the end of its advance under the thrust action which is applied to it by the roller;
• the spindle is mounted on a pivoting support, so that after cutting, it drives the sectional element towards its evacuation
• in the active position of the spindle, the rear axial end of the spindle is located in the immediate vicinity of the cutting plane.

• la figure 1 est une vue schématique en perspective des principaux composants d'une machine conforme aux enseignements de l'invention ;
• les figures 2 à 8 sont des vues schématiques en coupe axiale de la machine qui permettent d'illustrer les différentes étapes de découpe d'un rouleau.
• les figures 9, 10 et 11 représentent un mode de réalisation d'une broche expansible, vue, en coupe longitudinale et en position rétractée à la figure 9, en coupe longitudinale et en position expansée à la figure 10, et axiale en bout et en position expansée à la figure 11.

Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:

• Figure 1 is a schematic perspective view of the main components of a machine according to the teachings of the invention;
• Figures 2 to 8 are schematic views in axial section of the machine which illustrate the different steps of cutting a roll.
• Figures 9, 10 and 11 show an embodiment of an expandable spindle, seen in longitudinal section and in the retracted position in Figure 9, in longitudinal section and in the expanded position in Figure 10, and axial at the end and expanded position in Figure 11.

FIG. 1 shows a cutting machine 10 of known general design which includes in particular a guide bench 12 on which a horizontal roller rests main or "log" 14 of paper of great axial length which is a roller of the type without mandrel, or with a mandrel flexible central, which we wish to cut into a series of single rollers 16 of shorter axial length.

To this end, in the embodiment shown in the figures, the main roller cutting tool 14 is a disc saw blade 18 which is rotatably mounted about an axis of rotation A1 parallel to the axis X-X of the roller 14.

According to an alternative embodiment not shown the saw may be of the ribbon type.

So as to cut the roll 14 transversely, by its sharpened edge 20, the saw 18 is mounted movable by relative to the machine frame 10 around a horizontal axis of tilting A2, while being driven in rotation by known means, for example of the belt type (s).

According to another variant embodiment not shown, the frame supporting the rollers is movable vertically towards the cutting member and the latter is fixed vertically

In order to perform sawing in the best conditions, the front axial end portion of the main roller 14 which must be cut is held in position by means of known general concept in the form of cylindrical clamps which surround the periphery of the roller with a possibility of tightening. A front clip 24 is preferably arranged around the section being cut and a rear clamp 26 is arranged around the main roller 14, the two clamps thus being arranged on either side of the saw plane P corresponding to the plane in which the saw 18 tilts transversely.

According to another variant embodiment not shown, the log 14 is held by a single rear clamp 26.

In a known manner, the machine 10 also includes means for driving the main roller 14 for the move axially along the bench 12, in one movement in advance from back to front, these means acting for example on the rear free end of the main roller 14.

By axially pushing the main roller 14 from the rear forward, we can thus successively cut out a series of small rollers 16 of the same length if the advance travel of the log 14 is performed at a constant step.

As can be seen in the figures, the central hole cylindrical 28 of the front free end section 16 to be cut opens into the free end transverse face before 17 of this section and it is therefore accessible for, in accordance with lessons of the invention, introduce axially from behind forward, i.e. from left to right considering the figures, an expandable pin 30 for support and holding in the form of the section 16 during cutting.

The pin 30 is generally in the form of a cylinder of horizontal axis A3 which is delimited externally by a convex cylindrical surface 32 substantially continuous axially and whose outside diameter, according to one aspect of the invention, is variable in the since pin 30 is an expandable pin.

The expandable spindle 30 can also be of structural mechanical with an external surface constituted by cylinder sectors which are mounted radially movable in both directions so as to vary the outside diameter of the cylindrical envelope of the spindle.

Figures 9 to 11 show an example of realization of such a pin. This has a fixed part and an expanding mobile part.

The fixed part 50 is a hollow cylinder with a part before, i.e. in the direction of insertion into the hole central log, small outside diameter, and a rear part which is also of small diameter. However in a variant not shown, it may have a sufficient diameter to be used to reform the central hole of the roller when the spindle is inserted into it.

The cylinder 50 supports at its front part three branches or petals 52 which can pivot each around an axis by example perpendicular to that of cylinder 50. They can thus occupy a retracted position (Figure 9) in which they are in the extension of the cylindrical portion 50 and an active position (Figures 10 and 11) in which they form a large diameter cylindrical outer surface desired for holding inside the central hole of the roller and, where appropriate, its fitness.

In the embodiment shown, each branch 52 has a first part 54 of external shape in portion of cylinder. As seen in Figures 10 and 11, these branches form, in the expanded position, a cylinder of determined diameter. We see in Figure 9, in position retracted, that the front end of the spindle then has a frustoconical shape which facilitates its introduction into the hole center of the roller when it is partially collapsed.

The branches have one end 56 which is housed at inside the cylinder 50 and which forms a pivot with a housing ring 58.

The system is actuated by a rod 60 which includes a ring simultaneously engaged with the ends 56, and a ball 64 which rests on the inner surface of the branches 52. A motor controls the axial movement of the rod inside cylinder 50.

The device operates as follows.

We introduce the pin 30 inside the central hole of the roller in retracted position. The frustoconical shape of its part before helps to reform the central hole if necessary. Of even, the rear part is likely to contribute to the setting in shape if its diameter is sufficient. When the spindle is in position, the motor acts on the rod 60 which moves towards inside the cylinder. Ball 64 sliding on the face inside of the arms 52 rotates them around the housing 58. At the end of the rod stroke, the three branches 52 are spaced apart radially from each other and form a bearing surface of diameter corresponding to that which one has determined for the central hole.

According to an alternative embodiment, not shown, the expandable pin 30 can be an inflatable pin delimited by an outer casing of generally cylindrical shape in flexible material.

Whatever its constitution, the expandable pin 30 is likely to occupy a retracted state, which is for example illustrated in Figure 4, in which its outside diameter is minimal and is significantly smaller than the internal diameter of the hole central 28, and it is likely to occupy an expanded state in which its outside diameter is greater than or equal, of preferably greater than the internal diameter of the central hole 28 of so as to ensure cooperation by friction and by radial clamping between the peripheral cylindrical surface 32 of the expandable spindle 30 and the concave internal cylindrical surface from the central hole 28.

In the example shown, the expandable pin 30 is axially movable mounted relative to the frame of the machine 10, and therefore relative to the saw 18 and the roller 14 in the position of the sawing, by means 34 illustrated schematically on the figures.

Thus, the expandable spindle 30 can occupy a position active, shown in Figures 2 and 3, in which it is inserted axially into the central hole 28 of the part free end end of the main roller 14, and a position rest, free, in which it is located axially entirely outside the central hole 18.

We will now describe the operation and implementation machine work with reference to Figures 2 to 8.

In the position illustrated in Figure 2, the roller main 14 is in the axial sawing position with its part front free end clamped in clamps 24 and 26, with the saw 18 in the retracted position and with the expanding spindle 30 in active position and in its expanded state. As we can see in Figure 2, the rear end transverse face 31 of the expandable pin 30 is located substantially at right, at immediate proximity to sawing plane P, so that support and keep the future small roller in shape cut at least over most of its length axial, but without interfering with the saw when cutting.

In the position illustrated in Figure 3, the operation of sawing of the small roller 16 is finished and the expandable spindle 30 is being reduced in diameter to reach, as can be seen in figure 4, its state retracted in which its outside diameter is significantly less than the inner diameter of the central hole 28.

During this phase of radial retraction of the expandable spindle 30, we also control the return of the saw 18 in its retracted position, this return corresponding to a tilting of the saw 18 around the axis A2 in the plane transverse sawing P.

The next step is to extract axially from behind forward, i.e. from right to left considering the figures, the pin retracted 30 to reach the position illustrated in Figure 5 in which the pin 30 is located entirely outside the central hole 28 of the small roller cut 16 and in which the saw 18 has returned to its retracted position. The small cut roll 16 remained in position in the clamp 24 which retains it by clamping.

The next step in setting up the machine 10 consists in simultaneously opening the clamps 24 and 26 to reach the position illustrated in Figure 6 in which the main roller 14 and the small cut roller 16 are free to be moved axially from back to front, i.e. from right to left, under the action of means (no shown) of axial thrust of the roller 14 according to a advance movement whose stroke is substantially equal to the axial length of the roller 16.

Such an advance is illustrated in Figure 7 in which the main roller 14 is in the same axial position, for compared to saw 18, as the one illustrated in figure 2. During of this advance, the transverse face of free end before 17 of the main roller 14 simultaneously caused the thrust axial from back to front of the small cut roll 16 which is out of the machine. It can then be evacuated axially then vertically on a conveyor 38, its fall on the conveyor being guided and accompanied by a slide 40.

Next, the unrepresented control means machine 10 automatic caused introduction again, from the retracted pin 30 into the hole 28 of the main roller 14 then tightening of the clamps 26 and 24 to lead to the position illustrated in figure 8. In view of the cutting a new small roller 16, just order the expansion of pin 30 again to reach the position shown in Figure 2 in which can start a new cutting cycle of a new small roller 16. By its expansion the spindle 30 reform the end of the inside diameter of log in case it had still suffered a slight sag during the operation of previous cut.

As a variant not shown, if one wishes by example evacuate the cut roll 16 on a conveyor horizontal located at the same altitude as the main roller 14, it is possible, if necessary, to erase the expandable pin 30, after its axial exit from the central hole 28, to release the area downstream of the clamp 24.

Furthermore, two pliers 24 and 26 have been shown. now the log while cutting. According to a variant one can remove clamp 24 and provide a blocking piece axial of the section while the spindle is pulled towards a clear position allowing the evacuation of the section.

According to another alternative embodiment, the spindle is mounted on a support pivoting about a perpendicular axis to that of the log. After cutting, the section is driven in a rotational movement, down for example and then it's deposited on a conveyor which discharges it. In the next step, the support pivots to bring the spindle in the axis of the log which is then pushed axially until the spindle occupies the sawing position of the section. In this case, the pin has only pivoting movements. According to another variant, the support can carry several pins which are presented in turn in front of the log for cutting sections.

The machine according to the invention which has just been described is designed independently and can be easily integrated into a high-speed production line of paper rolls without central core.

Claims (10)

Machine (10) for cutting a roll of paper (14) into rolls (16) of shorter length, of the type comprising means (12) for guiding the roller (14) in axial translation, means for drive in axial translation of the roller (14) to move it opposite the cutting means (18) by means of a side saw capable of moving transversely between a retracted position and a sawing position in which it completely cuts a section of 'free axial front end of the roller (14),
characterized in that it comprises a removable pin (30), for supporting and maintaining the shape of the front axial end section during its cutting, which is capable of occupying an active position in which, for cutting , it is introduced, at least partially axially into the cylindrical central hole (28) of the roller, and a rest position to allow the evacuation of the cut section and to allow a movement of advance, from back to front, of the roller (14) for the cutting of a new section. Machine (10) according to the preceding claim, characterized in that the spindle (30) has at least one radially expandable part between a retracted state in which its outside diameter is much smaller than the diameter internal of the central hole of the roller so as to facilitate its insertion and axial extraction in and out of the hole central, and an expanded state in which the spindle is received with radial clamping in the central hole (28) of the roller. Machine (10) according to the preceding claim, characterized in that the expandable spindle (30) is a pneumatic or hydraulic inflatable spindle. Machine (10) according to claim 2, characterized in that the expandable spindle (30) is a mechanical spindle. Machine according to the preceding claim, characterized in that the spindle comprises a fixed part (50) small diameter at the end of which are mounted articulated a plurality of branches (52) movable between a retracted position and an active expanded position in which they provide radial tightening. Machine (10) according to any one of previous claims, characterized in that the spindle (30) is mounted movable in axial translation in both directions between its active position and its rest position. Machine (10) according to any one of previous claims, characterized in that, in position rest, the spindle (30) is released relative to the section cut (16) so as to allow the evacuation of the latter by axial thrust due to the advance of the roller (14). Machine (10) according to the preceding claim, characterized in that it comprises means (40) transverse evacuation of the cut section (16) after its advance under the thrust action applied to it by the roller (14). Machine according to one of claims 1 to 5, characterized in that the spindle (30) is mounted on a support pivoting, so that after cutting, it drives the cut-off element towards its evacuation. Machine (10) according to any one of previous claims, characterized in that, in position active of the spindle (30), the rear axial end (31) of the pin (30) is located in the immediate vicinity of the plane (P) of sawing.

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