EP0275806A1 - Cutting device for an apparatus which simultaneously dispenses and cuts off strips of coiled materials - Google Patents

Abstract

Improved cutting device for a device for simultaneously distributing and cutting strips of wound material. This device is remarkable in that it comprises two independent blades (22-23) arranged side by side at an angle and each corresponding to two half-lengths of the drum, said blades fixed on blade holders (24-25) oriented angularly in the drum each being associated with a follower roller (28-29) cooperating respectively with a fixed cam (10-30) of the same profile disposed on each lateral wing of the casing of the apparatus, said cams (10-30) being angularly offset to allow the progressive and successive exit of each of the blades and define two cutting zones (ZC1, ZC2) of the strip of material inside the device while obtaining only one clean cutting line of said material perpendicular to its side edges.

Description

Improved cutting device for a device for simultaneous distribution and cutting of strips of wound material.

The object of the invention relates to the technical sector of the means for distributing the length of materials wound on reels. In particular, but not exclusively, the invention applies to dispensers for paper, wadding and similar wiping materials.

The apparatus is not limited to the type according to which the roll of material in service mounted with free rotation on a support, is applied by pressure directly to a drum with non-slip surface, so that by simple manual pulling on the strip of overflowing material of the device, a strip is distributed and cut automatically, the length of which is substantially equal to the diameter of the drum, by a serrated cutting device associated with the drum, and protruding from the drum when it is rotated by traction on the material, so as to penetrate the material thus stretched on either side of the cutting device. After cutting, the launched drum returns to its initial position through the action of various complementary members, and a new strip of material overflows from the device.

Such a cutting device has in particular been described in the French patent ^No. 2.332.215 and in the Certificate of Addition ^No. 2,340,887 owned by the applicant. The drive mode of the cutting device, the drum rotates and the control means on the move, stop, and control have been described in the above patents and also in European Patent ^No. 0157713 and in French Patent n ^o 85.19447 and n ^o 85.02873 in the name of the depositor. Other means can however be used. However, it appears important for a good understanding of the invention to recall beforehand, by way of nonlimiting example, the particular characteristics of the cutting device described in the aforementioned patents, with reference to Figures 1, 2, and 3 of the drawings. .

These schematically illustrate the movement of the cutting blade. The drum (1) whose interior is hollow allows relative to its axis of rotation an internal operation of the cutting blade (2) by means of a roller (3) associated with the blade holder (4) cooperating with the outline of a fixed bearing (5) forming a cam and around it. The bearing by this cooperation ensures a movement of distribution and a progressive displacement of the blade (2), determined by the shape of the cam in order to make describe by this one inside the drum and simultaneously with the trajectory of this one. ci and in the same direction a full circle trajectory of 360 degrees from a retracted position to a position near the plane of tangency with respect to the strip of paper so that at the end of the manual pull of the blade cutting passing through the slot in the drum, the blade protrudes transversely in this strip, with penetration into the strip of paper which is stretched on both sides of the cutting blade.

The apparatus of the aforementioned type allows the cutting of lengths of strips of wadding and similar materials. This type of device is operated with great reliability of use and its commercial success confirms its technical performance.

However, it has appeared interesting for certain types of very fine wiping products the need to soften the tensile force of the cutting device when cutting the paper. Indeed, these very fine materials cause tearing of the paper during traction with the wet hands of the user.

The aim sought after according to the invention was therefore to improve, for example and without limitation, the design of the device to solve this need. In addition, the invention relates to a new cutting device whatever the additional means used for controlling the stopping of the drum.

After various tests and research carried out in In relation to the rotation of the drum, a solution has been found offering unexpected results which are very effective with regard to the cutting of paper into particularly very fine materials. This solution lies in a different arrangement of the cutting blade and of the cutting device in general according to an operating mode which goes against the prior operation of this device as recalled above, and of the prior art in general. of which the depositor is aware. This device is adaptable for single roller devices, double rollers and in general to any device comprising a service roller and at least one reserve roller.

According to a first characteristic, this device comprises an internally hollow drum with a longitudinal slot on its outer periphery, and receiving a blade and cutting blade support articulated against a return means inside the drum, said blade projecting externally through the slot under the effect of rotation of the drum when it is rotated by traction on the material so as to penetrate the material stretched on either side of the cutting device, said blade moving along a path given by a follower roller associated with the blade holder and cooperating with mechanisms including in particular a fixed profiled cam disposed on the side wall of the casing of the device arranged to receive said drive drum and one or more reserve rollers , said device being characterized in that it comprises two independent blades arranged side by side at an angle and each corresponding to a half-length of the ta mbour, said blades fixed on blade holders angularly oriented in the drum, each being associated with a follower roller cooperating respectively with a fixed cam of the same profile disposed on each lateral wing of the casing of the device, said cams being angularly offset for allow the progressive and successive exit of each of the blades and define two zones for cutting the strip of material inside the device while obtaining only one clean cutting line of said material perpendicular to its lateral edges.

These characteristics and others will emerge clearly from the following description.

• Les figures 1 et 2 sont des vues à caractère schéma­tique illustrant le fonctionnement du dispositif de coupe tel que décrit dans les brevets n^o 2.332.215 et 2.340.887 du dépo­sant.
• La figure 3 illustre schématiquement la lame utilisée pour couper la bande de papier, selon les figures 1 et 2.
• La figure 4 est une vue de face de l'appareil avec le nouveau dispositif de coupe dans sa mise en oeuvre non limita­tive avec un des appareils exploités par le déposant.
• La figure 5 est une vue de côté selon la ligne A-A de la figure 4.
• La figure 6 est une vue de côté selon la ligne B-B de la figure 4.
• La figure 7 est une vue partielle illustrant le posi­tionnement de l'une des lames de coupe dans le tambour, en coupe selon la ligne C-C de la figure 9.
• La figure 8 est une vue en coupe illustrant le tambour pris dans un demi-ensemble et agencé avec les deux lames de cou­pe selon l'invention.
• La figure 9 est une vue à caractère schématique illus­trant la position de l'une des lames de coupe au moment de la coupe de la bande de papier.
• Les figures 10, 11, 12 et 13, sont des vues à carac­tère schématique illustrant les différentes phases d'avancement de la coupe d'une bande de matériaux très fins, avec le disposi­tif selon l'invention.

To fix the subject of the invention illustrated in a nonlimiting manner in the figures of the drawings where:

• Figures 1 and 2 are schematic views illustrating the operation of the cutting device as described in Patent ^No. 2,332,215 and 2,340,887 of the applicant.
• FIG. 3 schematically illustrates the blade used to cut the strip of paper, according to FIGS. 1 and 2.
• Figure 4 is a front view of the device with the new cutting device in its non-limiting implementation with one of the devices operated by the applicant.
• FIG. 5 is a side view along the line AA in FIG. 4.
• FIG. 6 is a side view along the line BB in FIG. 4.
• FIG. 7 is a partial view illustrating the positioning of one of the cutting blades in the drum, in section along the line CC in FIG. 9.
• Figure 8 is a sectional view illustrating the drum taken in a half-assembly and arranged with the two cutting blades according to the invention.
• Figure 9 is a schematic view illustrating the position of one of the cutting blades when cutting the strip of paper.
• Figures 10, 11, 12 and 13 are schematic views illustrating the different stages of advancement of the cutting of a strip of very fine materials, with the device according to the invention.

In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.

The cutting device according to the invention can be used with all types of apparatus for distributing strips of wound material, single roller, double roller, and more generally with a service roller and several reserve rollers.

The cutting device according to the invention applies naturally but in a nonlimiting manner to the various devices whose characteristics have been described and defined in particular in the aforementioned patents. It goes without saying, however, that the cutting device according to the invention can in principle and its function be used with other devices.

A non-limiting application of the cutting device to GRANGER devices has been illustrated to enhance the new inventive concept.

Beforehand, we briefly recall the main elements of the GRANGER device. This comprises, from a housing, a base plate (6) for wall mounting, free rotation support means, a drive drum (7) relative to the lateral wings (6.1) (6.2) of said housing. . The drum receives inside a blade holder articulated on a side wall of the drum having on the outside a follower roller (9) cooperating with a fixed cam (10) to authorize the periodic exit of the serrated cutting blade outside of the drum, when the strip of material overflowing under the apparatus is pulled, thereby driving in rotation the drum with rough surface on which and applied the roll (R1) of wound material. This is carried by a support bracket (8) articulated on the base plate. We also see a roller (11) according to an arrangement described in another application, with a belt (12) also associated with the drum to correctly guide the material towards the lower opening and to avoid the introduction of the user's fingers to near the cutting blade.

Referring to FIG. 4, the casing includes, at the level of the positioning zone of the drum, clearances U-shaped interiors (6.3) formed on the side wings. It will be recalled, briefly, the main means allowing the blade to move out, the means being arranged on one of the walls (6-1) of the casing.

Referring to Figures 4 and 6, as described in the aforementioned prior patents, the parachute (13) is arranged to successively receive the cam support plate (14) (10), the profiled cam (10) authorizing the guiding of the follower roller (9) mounted on the blade holder, the pawl (16) with its return spring (17).

There is also illustrated a fixed ramp (15) curvilinear about 90 degrees and on which moves the movable stop (18) mounted on the drum; the fixed stop disposed on the drum is referenced in (19). This ramp is arranged between the cam (10) and the pawl and its orientation is established to allow the guide and the support of the mobile stop of the drum during the rotation of the latter. Also illustrated in (20) the non-return stop of the parachute and in (21) the guide roller of the free end of the strip of material. The operation of the mechanism has been described in the aforementioned prior patents and should be referred to.

The cutting device integrated in the material drive drum comprises according to the invention two independent blades (22-23) arranged side by side and each corresponding to substantially a half-length of the drum. As appears in Figure 8, the two blades are not arranged in alignment but at an angulation α of about 150 to 179 degrees and advantageously of the order of 170 °. Thus the two blades are arranged substantially in a plane symmetrical with respect to the transverse median axis of the drum, and are thus mounted opposite. Their serrated parts are however oriented on the same side. Each blade (22-23) is mounted on an L-shaped blade holder (24-25) articulated by its lower end on axes (32-33) positioned on support blocks (26) formed inside said drum; the support blocks of a same blade being offset to give an angular orientation of the blades (Figures 7 and 8). Each blade holder (24-25) is biased in the rest position corresponding to the blade removal inside the drum by a return spring (27), one end (27.1) of which is fixed to the wall of the drum. Furthermore, according to another arrangement of the invention, each blade or blade holder receives at the end in external overflow from each transverse wall of the drum, a roller (28-29) mounted free in rotation capable of acting and cooperating with fixed position cams arranged on the housing for receiving the drum and its complementary mechanisms. Thus it is understood that each blade (22-23) has an articulation movement which is specific to it while being similar to each other. Advantageously, provision is made for the axis of the drum, the axis of rotation of the rollers (28-29) and the axis (32) of articulation situated towards the lateral side of the drum of each blade holder to be aligned, along the line XX or substantially, limiting the cutting forces. According to another particularly important and complementary arrangement, the two aforementioned rollers (28-29) each cooperate with a fixed cam disposed on the casing of the device. More precisely by referring to the figures of the drawings, a first fixed cam is that (10) fixed on the first wing (6.1) of the casing on the side of the stop and locking mechanism in position of the drum as illustrated in FIG. 6.

A second fixed cam (30) is attached and fixed to the second wing (6.2) of the casing opposite to the previous one. The two cams (10) and (30) have exactly the same peripheral profile so that when the follower rollers (28-29) associated with the blade holders (24-25) bypass them along their outer periphery, the trajectories of the two blades are exactly the same.

However and according to an essential arrangement of the invention contributing to the proper functioning of the cutting device taken as a whole, the two cams (10) and (30) have a different angular orientation so that it occurs an offset in their output during the rotational movement of the drive drum. Their arrangement defines a different angular orientation of the order of about 80 to 100 degrees so that there is continuity in the penetration of the two blades in the strip of material to be cut. More specifically, as appears schematically in FIGS. 10 to 13, the angular offset of the two cams (10-30) makes it possible first to obtain penetration into the wiping material of a blade (22) on a half-width, then of the other blade (23) on the second half-width before the withdrawal of the first blade.

According to another interesting arrangement, the output of the teeth of each blade is progressive in the sense that as the rotation of the drum and the successive output of the blades, it is the teeth located towards the outside of the drum which come out first and then the others, gradually approaching the central part of the material. Thus, the outlet depth of the different teeth of each blade varies significantly, the outlet being maximum for the tooth closest to the lateral end of the drum. Furthermore, the slot (31) formed on the drum through which the blades pass is cut according to a V-profile complementary to the profile and arrangement of the blades. There are therefore two different cutting zones of the paper strip with respect to its dispensing roller and the drive drum, one being located substantially as illustrated in FIG. 10, immediately after the contact plane of the roller. of paper and of the drive drum (ZCI, cutting area 1), and the other in the lower rear part of the drive drum illustrated by the reference (ZC2, cutting area 2).

The cut is made along a continuous horizontal line of the strip of material. Furthermore, we see according to Figures 10 to 13 schematically that the last tooth of the first blade located most in the center of the drum, initiates a V-shaped cut corresponding to the profile of the tooth and the last tooth of the second blade located most in the center of the drum initiates another V cut adjacent to the above, a tiny strip of paper ensuring the connection between them. Under the continuous pulling effect of the strip of material by the user, said connecting strip also tears definitively separating the piece of pulled paper. The material is cut according to the above-mentioned device by tearing the paper strip with a progressive action. It should be made clear that the inclination of the cutting blades in two planes, on the one hand with respect to the longitudinal axis of the drum or its external generatrix and on the other hand the teeth of each blade in depth going towards the middle of the drum, combined with the profiles of the cams, allows a cut of the paper strip, straight, clean and without connection perpendicular to the sides of the strip.

Obtaining the result, namely the quality of the cut and its sharpness, requires particularly precise positioning of the various means constituting the cutting device. It should in particular be emphasized that the first blade (22) penetrates into the material by a hinge movement given according to the arrow F1 opposite to the direction of unwinding F2 of the drum, which accentuates the tearing effect with less effort. . The second blade (23) penetrates in the same direction as the direction of unwinding of the drum.

It is also necessary to indicate the wide open V-shaped inclination of the openings for the passage of the blades out of the drum avoiding the untimely stopping of the roll of material at this level, the roll of material always being in point contact or on a generator on the training drum. Compared to the prior art, one no longer feels the passage forming a flat portion of the rectilinear slot of the drum and on which the roll of paper could bear.

Thus, according to the invention the cutting of a strip of paper is carried out according to an approach and an original process. The cut is made in two stages, in two different cutting zones rents in situ in the device and thanks to a particular positioning of the cutting blades, and their respective teeth, the cutting line on the paper strip is rectilinear and perpendicular to its edges.

Thanks to these different arrangements, it is possible to reduce the strength of the various return springs and therefore their cost. It is without risk of unexpected tearing to pull very fine wiping material even with wet hands.

Claims (6)

-1- Cutting device improved for a device for the simultaneous distribution and cutting of strips of wound material, of the type comprising an internally hollow drum (7) with a longitudinal slot on its outer periphery, and receiving a blade and blade support section articulated against a return means inside the drum, said blade projecting externally through the slot under the effect of rotation of the drum when it is rotated by traction on the material so to penetrate into the stretched material on either side of the cutting device, said blade moving along a path given by a follower roller associated with the blade holder and cooperating with mechanisms including in particular a fixed profiled cam arranged on the side wall of the casing of the device arranged to receive said drive drum (7) and one or more reserve rollers (R1), said device being characterized in that it comprises two blades (22-23) independent arranged side by side at an angle and each corresponding to a half-length of the drum, said blades fixed on blade holders (24-25) oriented angularly in the drum each being associated with a follower roller ( 28-29) cooperating respectively with a fixed cam (10-30) of the same profile disposed on each lateral wing of the casing of the apparatus, said cams (10-30) being angularly offset to allow the progressive and successive exit of each of the blades and define two cutting zones (ZC1, ZC2) of the strip of material inside the device while obtaining only one clean cutting line of said material perpendicular to its lateral edges. -2- Cutting device according to claim 1 characterized in that each blade (22-23) is mounted on a blade holder (24-25) L-shaped articulated by its lower end on axes (32-33) positioned on support blocks (26) offset for mounting each blade, and formed inside said drum. -3- Cutting device according to claims 1 and 2 characterized in that the axis of the drum, the axis of rotation of the follower rollers (28-29) and the axis (32) of articulation of each blade holder , located on the lateral side of the drum, are aligned. -4- Cutting device according to claim 1 characterized in that the two cams (10-30) are angularly offset in an orientation of about 80 to 100 degrees, allowing during rotation of the drum, the penetration into the material d wiping of a first blade (22) over a half-width, then of the other blade (23) over the second half-width before the removal of the first blade. -5- Device according to claims 1, 2 and 4 together characterized in that the output of the teeth of each blade (22-23) is progressive, the teeth located towards the outside of the drum coming out first and then the others approaching as the central part of the material progresses. -6- Cutting device according to claim 1 characterized in that the slot (31) formed on the drum has a V-shaped profile complementary to the profile and arrangements of the blades.

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