ES2402734A1

ES2402734A1 - Mechanism of cutting of plastic bands (Machine-translation by Google Translate, not legally binding)

Info

Publication number: ES2402734A1
Application number: ES201330407A
Authority: ES
Inventors: Ernesto Puiggros Marull
Original assignee: Construcciones Electromecanicas del Ter SA
Current assignee: Construcciones Electromecanicas del Ter SA
Priority date: 2013-03-21
Filing date: 2013-03-21
Publication date: 2013-05-08

Abstract

Plastic band cutting mechanism essentially characterized in that it consists of a plurality of interchangeable cutting blades (1) mounted on guides (6) of a tooth support formed by two plates (3) (4) which acts together with a metal gripper. The plastic band to be cut constituted by upper jaws integrated in the plates (3) and (4) and other lower ones constituted by a "U" profile (10). (Machine-translation by Google Translate, not legally binding)

Description

Mecanismo de corte de bandas de plástico. Mechanism of cutting plastic bands.

TECHNICAL FIELD

La presente invención se refiere a un mecanismo para el corte de bandas de plástico utilizadas en la confección de bolsas de plástico en general. Dicho mecanismo cumple la función tradicional de las cuchillas de corte presentes en los cabezales de soldadura y corte propios de máquinas para la fabricación de bolsas en rollo mejorando las prestaciones de estas en cuanto a rendimiento y capacidad de corte. The present invention relates to a mechanism for cutting plastic bands used in the manufacture of plastic bags in general. Said mechanism fulfills the traditional function of the cutting blades present in the welding and cutting heads of machines for the manufacture of roll bags, improving their performance in terms of performance and cutting capacity.

BACKGROUND OF THE INVENTION

La fabricación de bolsas de plástico, por ejemplo de bolsas de basura, se basa en la realización de líneas de soldadura y corte sobre una banda de plástico, la cual es doblada sobre sí misma una o varias veces para conseguir la estructura de bolsa requerida, y que en muchos casos incorpora bandas de plástico complementarias que configurarán las cintas de cierre y transporte de la bolsa. The manufacture of plastic bags, for example garbage bags, is based on the realization of welding and cutting lines on a plastic band, which is folded on itself once or several times to achieve the required bag structure, and that in many cases incorporates complementary plastic bands that will configure the closure and transport tapes of the bag.

Por lo general los cortes realizados son líneas de rasgadura, consistentes en cortas incisiones alineadas interrumpidas por un muy corto tramo de material que mantiene el conjunto formalmente unido hasta que al efectuar una fuerza tangencial, se rasgan obteniéndose la separación de la pieza por la línea definida. In general, the cuts made are lines of tear, consisting of short aligned incisions interrupted by a very short section of material that holds the assembly formally joined until, when making a tangential force, they tear, obtaining the separation of the piece by the defined line. .

Estas líneas de rasgadura se hallan situadas generalmente entre dos líneas de soldadura con las que se cierra la bolsa por los laterales. Sistemáticamente se agrupan en conjuntos soldadura-corte-soldadura, donde la primera soldadura cierra un lateral de la bolsa precedente, la segunda cierra un lateral de la bolsa posterior, y la línea de corte marca el punto por el que las diferentes bolsas de desprenderán del rollo en el que son servidas para su uso. Es imperativo que la distancia entre las soldaduras y la línea de corte sea mínima, a fin de minimizar material perdido por bolsa. These tear lines are generally located between two welding lines with which the bag is closed on the sides. They are systematically grouped into welding-cutting-welding assemblies, where the first weld closes one side of the preceding bag, the second closes one side of the back bag, and the cut line marks the point where the different bags will detach from the Roll in which they are served for use. It is imperative that the distance between the welds and the cutting line be minimal, in order to minimize material lost per bag.

En estas condiciones, para realizar las líneas de corte se utilizan cuchillas que se insertan entre los cabezales de soldadura, descendiendo para efectuar los cortes cuando dichos cabezales se hallan en contacto con la banda. Under these conditions, blades are used to make the cutting lines that are inserted between the welding heads, descending to make the cuts when said heads are in contact with the band.

Las cuchillas presentan una geometría adaptada al corte a realizar, en función del ancho de la banda, los dobleces efectuados sobre esta, la fuerza deseada para la separación de las bolsas y las dimensiones de los cortes cuando estos son totales. Normalmente presentan una pluralidad de dientes puntiagudos que inciden sobre la banda y la atraviesa una cierta distancia hasta que la huella de la incisión realizada tiene la medida requerida. The blades have a geometry adapted to the cut to be made, depending on the width of the band, the folds made on it, the desired force for the separation of the bags and the dimensions of the cuts when they are total. Normally they have a plurality of pointed teeth that impact on the band and cross it a certain distance until the footprint of the incision made has the required measure.

El corte ha de ser extraordinariamente preciso, por lo que la tensión de la banda en la zona de corte ha de estar controlada. Este control se realiza a través de unos pisadores dispuestos en el lado externo de los cabezales de soldado, de manera que el tramo de banda entre los pisadores queda inmovilizado y tensionado. The cut must be extraordinarily precise, so the tension of the band in the cutting area must be controlled. This control is carried out through treadmills arranged on the outer side of the welder heads, so that the band section between the treadmills is immobilized and tensioned.

Sin embargo, las cuchillas actuales presentan cuatro problemas que la presente invención soluciona. However, current blades have four problems that the present invention solves.

En primer lugar, el corte puede resultar impreciso al no conseguirse una inmovilización y un control de tensión adecuado en el tramo de banda situado entre los pisadores. Esto es así porque los pisadores están dispuestos en el lado exterior de los cabezales de soldadura, a varios centímetros de la cuchilla, siendo entonces el elemento más alejado de la línea de corte. In the first place, the cut can be inaccurate because no immobilization and adequate tension control are achieved in the section of belt between the treadmills. This is so because the treadmills are arranged on the outer side of the welding heads, several centimeters from the blade, then being the furthest element from the cutting line.

El módulo de Young o módulo de elasticidad longitudinal es un parámetro que caracteriza el comportamiento de un material elástico según la dirección en la que se aplica una fuerza. En los plásticos, esta deformación es muy grande, por lo que, a mayor distancia entre los pisadores y la línea de corte, la deformación de la banda de plástico cuando se le aplica una fuerza es superior, agravándose la circunstancia si se tiene en cuenta que el calor desprendido por los cabezales de soldadura también incide negativamente en la tensión y deformación del plástico. Young's modulus or modulus of longitudinal elasticity is a parameter that characterizes the behavior of an elastic material according to the direction in which a force is applied. In plastics, this deformation is very large, so that, at a greater distance between the treadmills and the cutting line, the deformation of the plastic band when a force is applied is greater, aggravating the circumstance if taken into account that the heat given off by the welding heads also negatively affects the tension and deformation of the plastic.

El segundo problema radica en el cimbreo que sufre la cuchilla, al ser una lámina metálica que cruza transversalmente la máquina de fabricación de bolsas, por lo que su anchura es, como mínimo, igual al ancho máximo de banda que puede admitir la máquina. The second problem lies in the cimbreo that undergoes the blade, to the being a metallic sheet that crosses transversely the machine of manufacture of bags, by what his width is, like minimum, equal to the maximum width of band that can admit the machine.

Este cimbreo resta precisión al corte y por otro lado, a la larga puede producir deformaciones y roturas en el material. This cimbreo subtracts precision to the cut and on the other hand, in the long run it can produce deformations and breaks in the material.

Otro importante problema consiste en la imposibilidad de modificar la geometría de una cuchilla establecida. Another important problem is the impossibility of modifying the geometry of an established knife.

Como se ha citado anteriormente, la banda de plástico a cortar presenta una configuración variable en función de los dobleces que presente o de la incorporación de cintas y refuerzos. Esto significa que en un mismo corte de la banda, hay dientes que atacarán puntos donde solo hay que atravesar dos capas de material y dientes que atacaran zonas de cuatro capas, seis o incluso más. En esos casos los dientes tendrán una configuración y penetraran en la pieza de forma diferente a los primeros. Lo mismo ocurre cuando deseamos que parte de la línea de rasgadura generada tenga diferente resistencia al rasgado o incluso cuando es necesario efectuar un corte limpio de una medida superior al ancho de un diente. Esto obliga al fabricante a elaborar una cuchilla específica para cada perfil de corte deseado. As mentioned above, the plastic band to be cut has a variable configuration depending on the folds present or the incorporation of tapes and reinforcements. This means that in the same cut of the band, there are teeth that will attack points where you only have to cross two layers of material and teeth that attack areas of four layers, six or even more. In those cases the teeth will have a configuration and will penetrate the piece differently than the first. The same happens when we want that part of the tear line generated has different tear resistance or even when it is necessary to make a clean cut of a measure greater than the width of a tooth. This forces the manufacturer to make a specific blade for each desired cutting profile.

Por último, otro problema que la presente invención soluciona consiste en la necesidad de sustituir toda la cuchilla cuando un diente de la misma se rompe o se desgasta excesivamente. Finally, another problem that the present invention solves is the need to replace the entire blade when a tooth thereof breaks or excessively wears.

DESCRIPTION OF THE INVENTION

El objetivo de la presente invención es un mecanismo de corte de bandas de plástico operativamente dispuesto entre dos cabezales de soldadura, actuando exactamente igual que una cuchilla convencional a fin de que pueda ser incorporado en cualquier máquina de fabricación de bolsas sin que ello implique un profundo rediseño de la misma, que ofrezca unas prestaciones superiores en cuanto a precisión de corte, y que permita la modificación de su geometría así como la sustitución de sus dientes en caso de rotura o desgaste. The aim of the present invention is a plastic band cutting mechanism operatively arranged between two welding heads, acting exactly like a conventional blade so that it can be incorporated into any bag making machine without implying a deep redesign of the same, that offers superior performance in terms of precision of cut, and that allows the modification of its geometry as well as the replacement of its teeth in case of breakage or wear.

El nuevo mecanismo consta de una pluralidad de hojas de corte intercambiables a modo de dientes, que se disponen de manera alineada y paralela en un mismo plano, formando un perfil de corte y que se mueven conjuntamente, como si de una cuchilla convencional se tratase. Para ello van montadas en un soporte portadientes de gran rigidez, constituido por dos placas, la placa portaguías y una placa de cierre. The new mechanism consists of a plurality of interchangeable cutting blades by way of teeth, which are arranged in an aligned and parallel manner in the same plane, forming a cutting profile and moving together, as if it were a conventional blade. To this end, they are mounted on a highly rigid support holder, consisting of two plates, the guide plate and a closing plate.

La placa portaguías es maciza, básicamente rectangular presenta una zona rebajada en la que se disponen una pluralidad de tabicaciones paralelas, espaciadas una distancia igual al ancho de los dientes y de una altura correspondiente con su grosor. Las tabicaciones conforman un conjunto de celdas rectangulares que darán origen a una guía para cada diente. The guide plate is solid, basically rectangular, it has a recessed area in which a plurality of parallel partitions are arranged, spaced a distance equal to the width of the teeth and a height corresponding to their thickness. The partitions form a set of rectangular cells that will give rise to a guide for each tooth.

La cresta de las tabicaciones se halla alineada con el plano de la superficie del portaguías sobre el cual se acopla la placa de cierre. The crest of the partitions is aligned with the plane of the surface of the carrier on which the closure plate is coupled.

Esta placa de cierre igualmente es maciza y básicamente rectangular, y se apoya sobre la cresta de los tabiques cerrando el conjunto portadientes y generando unas las celdas de sección rectangular. La medida de estas celdas es tal que permite el libre movimiento longitudinal de los dientes, pero no desplazamientos laterales o diagonales. This closing plate is also solid and basically rectangular, and rests on the crest of the partitions, closing the assembly and creating some rectangular section cells. The measurement of these cells is such that it allows the free longitudinal movement of the teeth, but not lateral or diagonal displacements.

Las hojas de corte presentan una configuración rectangular alargada, en uno de cuyos extremos se dispone una punta de corte con forma básicamente triangular propiciando uno o dos filos de corte. En el extremo contrario, el cuerpo rectangular dispone de una cabeza de anclaje que se acopla a un soporte móvil que tiene como función el transmitir conjuntamente el movimiento a todas las hojas de corte. A lo largo de la hoja de corte se han previsto varios espaciadores que limitan el rozamiento con las paredes internas de las guías por las que se desplaza. The cutting blades have an elongated rectangular configuration, at one of whose ends there is a basically triangular shaped cutting tip leading to one or two cutting edges. At the opposite end, the rectangular body has an anchor head that is coupled to a mobile support whose function is to transmit the movement together to all the cutting blades. Several spacers are provided along the cutting blade that limit friction with the internal walls of the guides through which it travels.

La configuración de la punta de corte marca la diferencia entre diferentes dientes y la misma se diseña en función del corte deseado. The configuration of the cutting tip marks the difference between different teeth and it is designed according to the desired cut.

El soporte móvil está constituido por una placa de asiento donde se han previsto un asiento para la cabeza de anclaje de cada diente, y una regleta que se coloca sobre la zona de asiento de las cabezas de anclaje afianzándolas. The mobile support is constituted by a seat plate where a seat for the anchoring head of each tooth is provided, and a strip that is placed on the seating area of the anchoring heads securing them.

Esta configuración proporciona una superior rigidez del dispositivo de corte con respecto a una cuchilla convencional, y dado que el perfil de corte se construye mediante la asociación de diferentes hojas de corte intercambiables, este puede ser modificado simplemente sustituyendo aquellas hojas de corte necesarias. De la misma manera, la rotura accidental de un diente o su sustitución por desgaste se puede llevar a término manteniendo el resto de componentes. This configuration provides superior rigidity of the cutting device with respect to a conventional blade, and since the cutting profile is constructed by associating different interchangeable cutting blades, this can be modified simply by replacing those necessary cutting blades. In the same way, the accidental breakage of a tooth or its replacement by wear can be completed by maintaining the rest of the components.

Otro aspecto de la invención hace referencia a la incorporación de un nuevo pisador que retiene la banda de plástico mediante unas mordazas situadas a pocos milímetros de la línea de rasgado, con lo que se garantiza la tensión apropiada en la banda de plástico para el corte y se elimina totalmente la posibilidad de deformación relacionada con el módulo de Young del material y con el calor desprendido por los cabezales de soldadura. Another aspect of the invention refers to the incorporation of a new treadmill that retains the plastic band by means of jaws located a few millimeters from the tear line, thereby ensuring proper tension in the plastic band for cutting and the possibility of deformation related to the Young's modulus of the material and the heat released by the welding heads is totally eliminated.

Este pisador está constituido por dos mordazas formadas por los bordes de ataque de las placas que componen el soporte portadientes, los cuales incorporan un cordón elástico o elemento afín en cada caso que actúa conjuntamente con otras dos mordazas dispuestas en un soporte inferior que complementa el soporte portadientes. Este soporte inferior está constituido por un perfil con la misma estructura que el soporte portadientes pero en el que se han eliminado las guías, quedando un hueco en el que se insertan las puntas de corte durante la sección de la banda. Los bordes de ataque del soporte inferior incorporan también unos cordones elásticos que llegarán a contactar con los presentes en el portadientes cuando este desciende con las cuchillas. This treadmill is constituted by two jaws formed by the leading edges of the plates that make up the support holder, which incorporate an elastic cord or related element in each case that acts together with two other jaws arranged in a lower support that complements the support toothpick This lower support is constituted by a profile with the same structure as the support holder but in which the guides have been removed, leaving a gap in which the cutting tips are inserted during the section of the band. The leading edges of the lower support also incorporate elastic cords that will come into contact with those present in the holder when it descends with the blades.

DESCRIPTION OF AN EXAMPLE

Según los dibujos, la figura 1 representa una vista general del mecanismo de corte. La figura 2 corresponde a una vista explotada del mismo. La figura 3 representa dos hojas de corte con diferente geometría. Finalmente, la figura 4 corresponde a un alzado en sección. According to the drawings, Figure 1 represents a general view of the cutting mechanism. Figure 2 corresponds to an exploded view thereof. Figure 3 represents two cutting blades with different geometry. Finally, figure 4 corresponds to a section elevation.

De acuerdo con el ejemplo ilustrado, el novedoso mecanismo de corte de bandas consta de una pluralidad de hojas de corte (1) a modo de dientes, montadas en un soporte portadientes (2). According to the illustrated example, the novel band cutting mechanism consists of a plurality of cutting blades (1) as teeth, mounted on a tooth support (2).

El soporte portadientes (2) a su vez está constituido por una placa portaguías (3) y una placa de cierre (4). Fig.2 The support holder (2) in turn is constituted by a guide plate (3) and a closing plate (4). Fig. 2

La placa portaguías (3) presenta una zona rebajada en la que se disponen unas tabicaciones paralelas (5) de altura correspondiente al grosor de las hojas de corte (1), y dispuestas a espacios regulares correspondientes al ancho de las mismas. The guide plate (3) has a recessed area in which parallel partitions (5) of height corresponding to the thickness of the cutting blades (1) are arranged, and arranged at regular spaces corresponding to their width.

La placa de cierre (4) se apoya sobre la cresta de los tabiques (5) cerrando el conjunto portadientes (2) y generando unas celdas de sección rectangular constitutivas de unas guías (6), las cuales tienen una holgura suficiente para permitir el movimiento longitudinal de las hojas de corte (1), pero no desplazamientos laterales o diagonales. The closing plate (4) rests on the crest of the partitions (5) closing the holder assembly (2) and generating rectangular section cells constituting guides (6), which have a sufficient clearance to allow movement longitudinal cutting blades (1), but no lateral or diagonal displacements.

En la figura 3 del ejemplo ilustrado, se muestran dos tipos de hojas de corte de geometría diferente, al objeto de facilitar la compresión del concepto de “configurabilidad” del perfil de corte. Una es apropiada para hacer líneas de rasgadura (7a) y otra apropiada para realizar un corte seguido (7b). In figure 3 of the illustrated example, two types of cutting blades of different geometry are shown, in order to facilitate the compression of the concept of "configurability" of the cutting profile. One is appropriate to make tear lines (7a) and another appropriate to make a cut followed (7b).

Las hojas de corte (1) presentan una configuración rectangular alargada, en uno de cuyos extremos se dispone una cabeza de anclaje (11) que se acopla a un soporte móvil (9) que tiene como función el transmitir conjuntamente movimiento a todas los hojas (1) y en el extremo contrario, dispone de una punta de corte (7) con forma básicamente triangular propiciando dos filos de corte (8). The cutting blades (1) have an elongated rectangular configuration, at one of whose ends there is an anchoring head (11) that is coupled to a mobile support (9) whose function is to transmit motion together to all the blades ( 1) and at the opposite end, it has a cutting tip (7) with a basically triangular shape leading to two cutting edges (8).

En la zona inferior, media y superior de la hoja de corte (1) se disponen unos espaciadores (12) que limitan el rozamiento con las paredes de las guías (6) por las que se desplaza. In the lower, middle and upper part of the cutting blade (1) there are spacers (12) that limit friction with the walls of the guides (6) through which it travels.

El soporte móvil (9) está constituido por una placa donde se ha previsto un asiento (14) para la cabeza de anclaje The mobile support (9) is constituted by a plate where a seat (14) for the anchoring head is provided

(11) de cada hoja de corte (1), y una regleta (13) que se coloca sobre la zona de asiento de las cabezas de anclaje. (11) of each cutting blade (1), and a strip (13) that is placed on the seating area of the anchoring heads.

El mecanismo de corte incorpora un pisador que retiene la banda de plástico (16) constituido por unas mordazas superiores (15) y otras inferiores (10). The cutting mechanism incorporates a treadmill that retains the plastic band (16) consisting of upper jaws (15) and lower jaws (10).

Las mordazas superiores (15) están formadas por los bordes de ataque de las placas que componen el soporte portadientes (2), los cuales incorporan un cordón elástico (18) y las inferiores por un perfil en “U” (10) que incorpora también unos cordones elásticos (18). The upper jaws (15) are formed by the leading edges of the plates that make up the support holder (2), which incorporate an elastic cord (18) and the lower ones by a “U” profile (10) that also incorporates elastic cords (18).

Este perfil (10) presenta la misma estructura que el soporte portadientes (2) y en su hueco central se insertan las puntas de corte (7) durante la sección de la banda (16). This profile (10) has the same structure as the support holder (2) and in its central recess the cutting tips (7) are inserted during the section of the band (16).

REFERENCE LIST

1 Hoja de corte 2 Portadientes 3 Portaguías 4 Placa de cierre 5 Tabicaciones 6 Guías 7 Punta de corte 8 Filos 9 Soporte móvil 10 Perfil “U”/mordazas inferiores. 11 Cabeza de anclaje hoja 12 Espaciadores 13 Regleta 14 Asientos cabeza de anclaje 15 Mordazas superiores 16 Banda de plástico 17 Hueco mordazas 18 Cordón elástico 1 Cutting blade 2 Holder 3 Guide holder 4 Closing plate 5 Tabulations 6 Guides 7 Cutting tip 8 Blades 9 Mobile support 10 “U” profile / lower jaws. 11 Anchor head blade 12 Spacers 13 Strip 14 Seats anchor head 15 Upper jaws 16 Plastic band 17 Hollow jaws 18 Elastic cord

Claims

1st.- Mechanism of cutting plastic bands characterized essentially by a plurality of interchangeable cutting blades (1) as teeth, mounted on guides (6) provided on a support holder (2) consisting of a guide plate (3) and a closing plate (4). It also incorporates a treadmill of the plastic band to be cut (17) consisting of upper jaws (15) and lower jaws (10), the upper ones being integrated in the guide plate (3) and the closing plate (4).

2nd.- Mechanism for cutting plastic bands according to claim one, characterized in that the guide plate (3) has a recessed area in which a plurality of parallel partitions (5) of height equal to the thickness of the cutting blades are provided. (1), and arranged to regular spaces corresponding to their width.

3.- Mechanism for cutting plastic bands according to claim one and two, characterized in that the closing plate (4) is positioned on the crest of the partitions (5) closing the holder assembly (2), generating some sectional cells rectangular constitutive of the guides (6), which have a sufficient clearance to allow the longitudinal movement of the cutting blades (1), but not lateral or diagonal displacements.

4th.- Mechanism of cutting plastic bands according to claim one characterized in that the cutting blades

(1) they have an elongated rectangular configuration, at one of whose ends there is an anchor head (11) that is coupled to a mobile support (9) and at the opposite end, it has a cutting tip (7) basically shaped triangular propitiating one or two cutting edges (8), the geometry of this tip being variable depending on the desired cut.

5th.- Mechanism for cutting plastic bands according to claim one and four, characterized in that along the cutting blade (1) there are spacers (12) that limit friction with the walls of the guides (6).

6.- Mechanism of cutting plastic bands according to previous claims, characterized in that the mobile support (9) is constituted by a plate where seats (14) are provided for the anchoring head (11) of each cutting blade ( 1), and a strip (13) that is positioned on the seating area of the anchoring heads preventing its exit.

7º.- Mechanism of cutting plastic bands according to claim one characterized in that the upper jaws (15) are formed by the leading edges of the plates that make up the support holder (2), and incorporate an elastic cord (18) or element related to coming into contact with the plastic band to be cut (16).

8ª.-Mechanism of cutting of plastic bands according to claim one characterized in that the lower jaws are constituted by a "U" profile (10) in whose ridges elastic cords (18) or related element are arranged.

SPANISH OFFICE OF THE PATENTS AND BRAND

Application no .: 201330407

SPAIN

Date of submission of the application: 21.03.2013

Priority Date:

REPORT ON THE STATE OF THE TECHNIQUE

51 Int. Cl.: B26B27 / 00 (2006.01) B26D1 / 04 (2006.01)

RELEVANT DOCUMENTS

Categoría Category: 56 Documentos citados Reivindicaciones afectadas 56 Documents cited Claims Affected

X X: US 5036590 A (REINKE ARTHUR J et al.) 06.08.1991, 1 US 5036590 A (REINKE ARTHUR J et al.) 06.08.1991, one

columna 1, líneas 9-63; columna 2, línea 18 – columna 3, línea 30; figuras 1-6. column 1, lines 9-63; column 2, line 18 - column 3, line 30; Figures 1-6.

Y Y: 2,4-8 2.4-8

Y Y: GB 1334383 A (BEECHWOOD MEATS LTD) 17.10.1973, 2,4 GB 1334383 A (BEECHWOOD MEATS LTD) 17.10.1973, 2.4

página 1, líneas 11-67; página 2, líneas 31-68; página 2, líneas 31 – página 3, línea 3; figura 2,3. page 1, lines 11-67; page 2, lines 31-68; page 2, lines 31 - page 3, line 3; figure 2.3.

Y Y: ES 1077791 U (TALLERES ANCHI S.L.) 08.10.2012, 6 ES 1077791 U (TALLERES ANCHI S.L.) 08.10.2012, 6

página 2, líneas 6-9; página 3, líneas 2-15; página 4, línea 14 – página 5, línea 7; figuras 1-4. page 2, lines 6-9; page 3, lines 2-15; page 4, line 14 - page 5, line 7; Figures 1-4.

Y Y: US 2005125033 A1 (MCNALLY-HEINTZELMAN KAREN M et al.) 09.06.2005, 5,7,8 US 2005125033 A1 (MCNALLY-HEINTZELMAN KAREN M et al.) 09.06.2005, 5,7,8

párrafos [0001,0004-0008,0020-0040]; figuras 1a-2e. paragraphs [0001,0004-0008,0020-0040]; Figures 1a-2e.

A TO: US 3883953 A (SAULLO JAMES W et al.) 20.05.1975, 1,4,7 US 3883953 A (SAULLO JAMES W et al.) 20.05.1975, 1,4,7

columna 1, líneas 6-9,37-48; columna 2, líneas 12-26; figuras 1-7. column 1, lines 6-9,37-48; column 2, lines 12-26; Figures 1-7.

A TO: WO 9006812 A1 (GEE DAVID WILLIAM et al.) 28.06.1990, 1 WO 9006812 A1 (GEE DAVID WILLIAM et al.) 28.06.1990, one

páginas 1-5; página 8, línea 5 – página 16, línea 20; figuras 1-38. pages 1-5; page 8, line 5 - page 16, line 20; Figures 1-38.

A TO: DE 4021735 A1 (C E PATTBERG GMBH & CO) 04.04.1991, 1,4 DE 4021735 A1 (C E PATTBERG GMBH & CO) 04.04.1991, 1.4

columna 1, línea 3 – columna 3, línea 18; columna 3, línea 38 – columna 6, línea 22; figuras 1-6. column 1, line 3 - column 3, line 18; column 3, line 38 - column 6, line 22; Figures 1-6.

Categoría de los documentos citados X: de particular relevancia Y: de particular relevancia combinado con otro/s de la misma categoría A: refleja el estado de la técnica O: referido a divulgación no escrita P: publicado entre la fecha de prioridad y la de presentación de la solicitud E: documento anterior, pero publicado después de la fecha de presentación de la solicitud Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

El presente informe ha sido realizado • para todas las reivindicaciones • para las reivindicaciones nº: This report has been prepared • for all claims • for claims no:

Fecha de realización del informe 17.04.2013 Date of realization of the report 04.17.2013: Examinador M. C. Fernández Rodríguez Página 1/5 Examiner M. C. Fernández Rodríguez Page 1/5

REPORT OF THE STATE OF THE TECHNIQUE

Minimum documentation searched (classification system followed by classification symbols) B26D Electronic databases consulted during the search (name of the database and, if possible, terms of

search used) INVENES, EPODOC

WRITTEN OPINION

Date of Completion of Written Opinion: 04.17.2013

Statement

Novedad (Art. 6.1 LP 11/1986) Novelty (Art. 6.1 LP 11/1986): Reivindicaciones Reivindicaciones 1-8 SI NO Claims Claims 1-8 IF NOT

Actividad inventiva (Art. 8.1 LP11/1986) Inventive activity (Art. 8.1 LP11 / 1986): Reivindicaciones Reivindicaciones 1-8 SI NO Claims Claims 1-8 IF NOT

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).

Opinion Base.-

This opinion has been made on the basis of the patent application as published.

WRITTEN OPINION

1. Documents considered.-

The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Documento Document: Número Publicación o Identificación Fecha Publicación Publication or Identification Number publication date

D01 D01: US 5036590 A (REINKE ARTHUR J et al.) 06.08.1991 US 5036590 A (REINKE ARTHUR J et al.) 06.08.1991

D02 D02: GB 1334383 A (BEECHWOOD MEATS LTD) 17.10.1973 GB 1334383 A (BEECHWOOD MEATS LTD) 17.10.1973

D03 D03: ES 1077791 U (TALLERES ANCHI S.L.) 08.10.2012 ES 1077791 U (TALLERES ANCHI S.L.) 08.10.2012

D04 D04: US 2005125033 A1 (MCNALLY-HEINTZELMAN KAREN M et al.) 09.06.2005 US 2005125033 A1 (MCNALLY-HEINTZELMAN KAREN M et al.) 06.09.2005

2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement

The object of the invention is a mechanism for cutting plastic bands, with a plurality of interchangeable cutting blades, mounted as guides, a treadmill, with upper and lower jaws.

The technical problem is the cutting or tearing of continuous plastic bands for the manufacture of bags, for example roll garbage bags, so that pulling a bag is separated by the tear line.

The solution proposed in the application presents a guide plate with a recessed area where parallel partitions are arranged, which provides greater rigidity to the cutting device, allowing the exchange of the cutting blades, also has jaws that hold the continuous band plastic, thanks to an elastic cord or related element.

State of the art:

Document D01 (see D01, column 1, lines 9-63; column 2, line 18 -column 3, line 30; figures 1-6.) Discloses a plastic band cutting mechanism that essentially consists of a plurality of sheets interchangeable cutting

(26) as a tooth, mounted on a guide holder (22) in which it fits into a support holder (24), arranged in an upper jaw (20). It also incorporates a treadmill of the plastic band to be cut constituted by a lower jaw (14).

Document D01 does not explicitly disclose that the support holder is divided into a guide plate and a closing plate, nor that there is division in the upper or lower jaw, although it can be seen by the figures that the latter is divided by a profile in "U" (27), where the teeth or cutting blades fit.

Therefore, the differences indicated are considered to represent an obvious design option for a person skilled in the art, in view of the state of the art, and therefore, that independent claim 1 has no inventive activity (Art.8 L11 / 86 ).

Document D02 (see D02 page 1, line 11 -line 67; page 2, lines 31 -68; page 2, lines 31 -page 3, line 3; figure 2, 3.) discloses a guide plate that has a plurality of parallel partitions (13) of height equal to the thickness of the cutting blades (17), and arranged to regular spaces (12) corresponding to their width.

It would be obvious to one skilled in the art, to combine the characteristics disclosed by document D02 with those anticipated by document D01, to obtain the cutting mechanism object of claim 2, therefore, it is considered that said claim 2 does not imply inventive activity (Art.8 L11 / 86).

It is considered that the characteristics of claim 3 represent an obvious design option for a person skilled in the art, in view of the state of the art and therefore that claim 3 lacks inventive activity (Art.8 L11 / 86) . The D01 describes that the plastic band cutting mechanism has cutting blades (26) of elongated rectangular configuration, at one of whose ends an anchoring head (22, 24) is arranged that is coupled to a mobile support (20) and at the opposite end, it has a cutting tip (27) with a basically triangular shape

Document D01 does not disclose that the mechanism can cause one or two cutting edges, or that the geometry of the cutting tip is variable depending on the desired cut.

However, these design options are considered obvious to a person skilled in the art in view of the state of the art, and therefore, that claim 4 does not imply inventive activity (Art. 8 L11 / 86).

Document D04 (see D04 pages 1 -5; page 8, line 5 -page 16, line 20; figures 1 -38.) Discloses tweezers whose jaws or blades have protrusions (110, 112) as spacers.

It would be apparent to one skilled in the art to combine the features anticipated by documents D04 and D01, to obtain the cutting mechanism object of claim 5, and therefore that said claim does not imply inventive activity (Art.8 L11 / 86) .

WRITTEN OPINION

The D03 (see D03 column 1, lines 6-9; column 1, lines 37-48; column 2, lines 12-26; figures 1-7.) Discloses a support with a plate where seating for heads of anchoring (3) of each cutting blade or blade, and emptying (5) for clamping blades (6).

In view of the features disclosed by D03, and D01, the person skilled in the art could consider that the combination of all the features set forth in claim 6 is a normal design process. Thus the object of claim 6 does not imply inventive activity (Art.8 L11 / 86).

The D04 describes jaws whose contact parts (116, 120) with the material to be treated are provided with elastic cords or related element (122). It is considered that the effect of arranging the elastic cords or related element, is to facilitate the grip, and therefore, that the protuberances (122) can be considered related or equivalent elements. Therefore, claim 7 does not imply inventive activity (Art.8 L11 / 86).

D01 discloses a mechanism for cutting plastic bands in which the lower jaws are constituted by a "U" profile.

It is considered that it would be apparent to one skilled in the art, in view of the state of the art, to combine the features disclosed in D04 with those anticipated by D01, to obtain the cutting mechanism object of claim 8, and therefore , that this does not imply inventive activity (Art.8 L11 / 86).