MX2008007104A - End plug for a roll of material, roll of material and retention mechanism in a dispenser - Google Patents

Abstract

The invention relates to an end plug (5) for a roll of material to be inserted into a retention mechanism (1), the end plug comprising:a receiving portion(60) for being inserted in the roll of material, an end face (680) for contacting the retention mechanism and a bearing member (70) for being inserted into the retention mechanism. The bearing member comprises a bearing pin (80) comprising a counter surface (82) facing the end face and at least one locking portion (950) for locking the end plug in an end position (250) in the retention mechanism, the locking portion being positioned within a zone (900) defined by a first surface (90') extending towards the end face from an intersection position (910) with the bearing pin, the first surface being inclined with respect to the longitudinal axis of the bearing pin by an angle of 117 and a second surface (90'') extending towards the end face from the intersection position, the second surface being inclined with respect to the longitudinal axis of the bearing pin by an angle of 141.

Description

EXTREME PLUG FOR A ROLL OF MATERIAL, ROLL OF MATERIAL AND RETENTION MECHANISM IN A DISPATCHER 1. Technical Field The invention relates to the technical field of dispensers for interchangeable rolls of material, in particular rolls of thin paper, and the appropriate geometry to insert these rolls in these dispatchers. In particular, the invention relates to an end cap of a roll of material, in particular a roll of thin paper, which is to be inserted towards a retainer mechanism of a dispenser. 2. Previous Bouquet Many dispatchers are known in the field to dispatch paper towels, kitchen paper, toilet paper, thin sheet, plastic wrap sheet and other materials rolled into a roll. Usually, these dispensers are provided with a support guide bracket having support members in the form of arms on each of which one end of an interchangeable roll is rotatably mounted. The support arm usually carries a hub member rotatably supported thereon onto which one end of the roll core is inserted when replacing the roll.

US 4,340,195 relates to a dispenser for accommodating rolls of source and reservoir of flexible sheet material having a housing provided on inwardly oriented tracks on opposite inner side walls thereof and guide means associated with each track adjacent to the lower end of the sheet. the same to impulsively assist the source roll in the dispensing action with a reserve roll segregation device cooperating between the guide means and the reserve roll for both holding the reserve roll away from the dispensing position of the roll source and drive the guide means to brake against the rolled envelope of the source roll incident to the removal of sheet material thereof. US 4,307,639 describes a dispenser of rolled rolls of flexible sheet material, such as paper towels, thin hygienic paper or the like having inwardly oriented tracks on the opposite inner side walls of the dispenser housing to receive the spindles therein. they are projected outwards, carried by rolled rolls that are going to be supplied so that the rolls move in succession downwards in relation to the tracks with a section of the lower end of each track inclining away from a feed roller mounted adjacent the lower end of the dispenser housing and each track having in said lower end section a pivotally mounted roll rotation guide deflected towards the center of track from the underside of each track section by bending in housing from the feed roller. A serrated cutting blade is pivotally mounted within the feeder roller to cut the hoe material, the grooves of the blade being spaced to accommodate between the deformable eccentric segment and the conical portions on the pressure roller during the initial projection of the blade from inside the feed roller when cutting the sheet material. WO 2005/094653 A1 relates to a fastening mechanism for a dispenser, a roll of interchangeable material and an end plug, therefore, and a method for inserting a roll of material into said fastening mechanism. The roll is provided with at least one end cap with a bearing pin for mounting the roll to the dispenser holding mechanism. The clamping mechanism comprises a clamping housing with a guide groove for insertion of the bearing pin, the guide groove having a first section with a first width and a second section with a second width that is smaller than the first width. The first and second sections are arranged in a direction perpendicular to the longitudinal extension of the guide groove and in a longitudinal direction of the bearing pin to be received. A sliding element is mounted to the holding housing and 7 is movable between a first position that closes or narrows the width of the guide groove and a second position that opens the guide groove. A clamping element is mounted on the sliding element and is rotationally movable about a rotation e between a clamped position and an unclamped position. The fastening element is provided with a coupling portion that, in a clamped position, it is coupled with a clamping geometry of the clamping housing. 3. SUMMARY OF THE INVENTION An object of the present invention is to provide end plugs for a roll of material that improves the insertion capacity of the end plugs in a retention mechanism as well as that of improving the clamping forces and capacity. exchange end plugs in the retention mechanism. Another object is to provide a retention mechanism for these plugs of extreme . The first object is solved by an end cap for a roll of material with the features of claim 1 or claim 7. A retention mechanism that resolves the second object is defined by features of claim 41. The basic idea of the invention is to provide a concept of fastening an end plug in a latch mechanism wherein the end plug comprises a latch portion for holding the end plug in an end position in the latch mechanism. The end position is generally related to the position that the end cap takes when the roll of material is in its operable dispensing position. The position of the fastening portion in the end cap is placed in a zone that is defined between a first surface and a second surface so that a large variety of different structures is conceivable that can be used in connection with the holding mechanism of the present exhibition. In particular, the end cap for a roll of material to be inserted into a retention mechanism according to claim 1 comprises a receiving portion to be received in the roll of material, in others words with dimensions to fit into the roll of material. Provided, in addition, an end face for contact with the retention mechanism and a support member to be inserted towards the retention mechanism, in other words with dimensions to fit into the retention mechanism. According to the inventive concept, the support member comprises a bearing pin comprising a counter surface facing the end face and at least one holding portion for holding the end cap in an end position in the retaining mechanism . As mentioned above, the fastening portion which forms part of the support member and which is located in a zone defined by a first surface extending towards the end face from a position of intersection with the bearing pin, the first surface being inclined with respect to the longitudinal axis of the bearing pin by an angle of 117 °, and a second surface extending towards the end face from the intersecting position, the second surface being inclined with respect to the longitudinal axis of the support pin by an angle of 141 °. This particular concept of an end cap with a holding portion forming part of the support member and is positioned in an area between the first surface and the second surface allows the provision of different structures defining the holding portion so that the individual geometry and design of the holding portion can be freely selected in order to adjust the cap of extreme of the particular needs of a user. As the structures are compatible with the retention mechanism, reliable clamping within the retention mechanism and defined clamping forces can be achieved for all structures that have a clamping portion placed within the defined area between the first surface and the second surface. The different conceivable structures for the definition of the clamping portion allow a fine adjustment of the end plug with respect to clamping resistance, plug stability in general, complexity of the molding tools and consumption of material. The last two aspects are also related to the cost of the end plug. The aspects described above, in particular with respect to the position of the fastening portion, provide an end plug with a fastening portion that provides the necessary insertion capability, and same time the clamping force. Additionally, this particular arrangement of the fastening portion that serves to hold the end plug in an end position has various advantages over simply providing the conventional pin without any additional fastening portion. An end cap with the additional holding portion, by a door, can slide more easily towards the retaining mechanism but on the other hand, supports higher loads without being deformed. Since the fastening portion is necessarily located between the first and second inclined surfaces, structures that can not be easily deformed are conceivable since the fastening portion generally has a broad base on the end face of the end plug. In a preferred embodiment, the intersection position is spaced from the end face by 2 mm. This particular embodiment allows a definition of the position of the holding portion that is compatible with the holding mechanism of the present disclosure. Preferably, the end face defines a contact plane for contacting the retention mechanism where the flat contact faces of the opposite surface. In another mode, the intersection position is spaced of the contact plane by 2 mm. Depending on the intended effect for the fastening portion, it could be advantageous when the second surface is inclined with respect to the longitudinal axis of the support pin by an angle of 119 °. Consequently, the volume of the area in which the fastening portion is positioned can be decreased with the positive effect that the end plug can slide towards a latching mechanism more smoothly but provides substantially the same clamping forces in the position of extreme. Consequently, the properties of insertion, support and restraint can be improved. In the last preferred embodiment, the position of the holding portion can be additionally placed in a zone defined by a third surface extending from the intersecting position towards the end face, the third surface being inclined with respect to the longitudinal axis of the support pin by an angle of 122 °, and a fourth surface extending from the intersection position towards the end face, the fourth surface being inclined with respect to the longitudinal axis of the support pin by an angle of 141 °, in where the holding portion is located between the first surface and the second surface or between the third and fourth surface. The provision of a fastening portion in the defined areas between the first and second surfaces and the third and fourth surfaces allows a smooth insertion of the end cap and a wide variety of different structures that can be used in combination with the retention mechanism. The end plug according to claim 7 also comprises a receiving portion to be received in the roll of material, in other words with dimensions to fit in the roll of material, an end face defining a contact plane for making contact with the retention mechanism and a support member to be inserted towards the retention mechanism, in other words with dimensions to be adjusted from within the retention mechanism, the end face being located between the support member and the receiving portion. The support member according to the inventive concept comprises a support pin comprising at least a first portion of a first external diameter, a second portion of a second external diameter, and a third portion of a third external diameter, the second portion being located between the first portion and the third portion, and the second portion outer diameter being smaller than the first outer diameter and the third outer diameter, wherein the third portion is located closer to the end face than the first portion. In addition, at least one fastening portion for securing the end cap at an end position in the mechanism is retained. The fastening portion that forms part of the support member and being located closer to the end face than the second portion of the support pin, wherein the fastening portion has at least one extension that is greater than the first, second diameters. and third external support pin. This end plug also allows the provision of a fastening portion can be defined by a variety of different structures in the end cap and that can be made especially to the needs of the user while providing improved insertion, support and restraint properties . The holding portion can be defined by a truncated cone, the base of the truncated cone being located adjacent to the end face and the upper part of the truncated cone which is located adjacent to the support pin. The upper part of the truncated cone may have a diameter substantially corresponding to the third outer diameter of the support pin, in particular a diameter of 5 mm. In a preferred embodiment, the outer surface of the truncated cone is inclined with respect to the longitudinal axis of the support pin by an angle of less than 117 °. In this particular modality, it is preferred if the external surface of the truncated cone is intercepted with the support pin in a position separated from the end face of less than 2 mm, in particular less than 1.5 mm. These specific measures allow a very flexible design of a plug between or where, at the same time, the truncated cone surface is still compatible with the retention mechanism and provides improved insertion, clamping and support properties. The truncated cone can be adapted to the specific needs with regard to stability, slip capacity and material consumption. In a specific case, the truncated cone also has improved properties with respect to the production of the end cap where the occurrence of an air bubble in the support pin can be reduced and / or the position of the air bubble can be reduced. move towards one end of the support pin so that the stability of the support pin is not compromised. It is self evident that a truncated cone must have an angle of inclination with respect to the axis longitudinal of the support pin that is greater than 90 ° in order to be called a cone. Preferably, the holding protrusion is rotationally symmetrical with respect to the longitudinal axis of the support pin. This specific embodiment has the advantage that the end plug provides a smooth and constant movement when it is rotated about the longitudinal axis. However, the fastening portions that are not rotationally symmetrical, eg, rectangular or fragmented, are also conceivable as long as they are located in the sections defined above and as long as they provide the necessary clamping force in combination with the retaining mechanism. . In a preferred embodiment, the fastening portion can be defined by a ring-shaped structure located on the end face, and the top portions of the ring-shaped structure can define the fastening portion. This specific embodiment can be advantageous when a roll of material is to be removed from the retention mechanism in order to exchange it with a fresh roll since it can be configured in such a way that it can be removed more easily when the roll of material has run out. In another preferred embodiment, the holding portion is defined by a stepped structure located on the end face, wherein at least a corner portion of the step structure can define the fastening portion. With respect to this modality, basically the same comments as above regarding the ring-shaped structure are applied. In addition, the stepped structure may be easier to manufacture and the molding tools may be less complicated compared to the situation of the truncated cone, since there are no inclined surfaces present. In still another preferred embodiment, the fastening portion is defined by a bevelled structure located on the end face, wherein at least a portion of the bevelled structure defines the fastening portion. This specific mode allows relatively low wear and, thus, is practical for use on end plugs that are to be reused or for heavier rolls of material with relatively long webs of material. In another embodiment, the fastening portion is defined by a substantially cylindrical structure located on the end face, wherein at least a corner portion of the substantially cylindrical structure defines the fastening portion. The technical effects of this modality correspond basically the stepped structure mentioned above but the end cap has a still simpler structure, which leads to a still simpler molding tool. In still another embodiment, the fastening portion defined by a hemispherical structure and / or another substantially spherical surface, wherein at least a tangential portion of the hemispherical structure and / or other substantially spherical surface defines the fastening portion. The technical effects of this embodiment correspond basically to those mentioned with respect to the previous beveled structure but the molding tool could have an even simpler structure since no corner portions are present. In another preferred embodiment, the end face comprises recesses, wherein the end face may comprise a flange defining the contact plane. This embodiment has the advantage that the consumption of material can be reduced due to the recesses, preferably without compromising the total resistance of the end plug. This additional strength can be achieved, for example, by providing additional support structures. The contact plane can still come up against an external wall of the retention mechanism in order to provide the necessary guidance function. The end cap as described above can be adjusted to fit into the hollow core of a roll of material, in particular a roll of paper towel or a roll of toilet paper. The present invention, furthermore, it provides a roll of material for use in a retention mechanism which is provided, at least at one longitudinal end of the roll, with an end cap as described above. A retainer mechanism in a dispenser for retaining an end plug of a roll of interchangeable material is defined by a housing with an insertion groove for inserting a support member of the end cap, the insertion slot being disposed between a rail of guide upper and lower one, the guide rails having at least one inclined sliding surface for interaction with an inclined holding portion of the support member. Additionally, a clamping member formed on at least one of the guide rails is provided, the clamping member being formed so as to interact with the inclined clamping portion of the support member to retain the end plug in a end position and a counter bracket being disposed in the housing, the counter bracket having a guide groove for guiding the support pin of the support member. Said retention mechanism ensures that the interaction between the end plug, as described above, and the retention mechanism itself allows easier insertion and removal of the end plug or a roll of material and ensures a clamping force on the scale desired from 15N to 19N, in particular 18N to 19N. The provision of a clamping force is particularly important if the insertion groove is inclined with respect to the horizontal plane, eg, by 6 °. The holding force then serves to hold the roll of material in place against the gravitational forces and against the pulling forces exerted when the user pulls a paper towel out of the dispenser. Preferably, the clamping member is formed on the inclined sliding surface of one of the guide rails. The clamping member may be a protrusion extending perpendicular to the insertion groove. To achieve the defined insertion and removal characteristics, the fastening member may have a first inclined portion disposed in the direction of insertion, before the clamping member and a second inclined portion disposed, in the insertion direction, behind the clamping member, the first inclined portion having a smoother inclination than that of the second inclined portion. The inclined portions formed in this manner ensure proper interaction with the inclined surface of the end cap and ensure easy insertion and appropriate clamping forces. The asymmetrically formed inclined portions allow different insertion forces and removal forces of the end cap when it is inserted towards and pulled out of the retention mechanism. In other words, these features are related to a retention mechanism that allows for easy retention of a roll but retains the roll securely in the retention mechanism. In a preferred embodiment, the clamping member is formed by decreasing the tilt angle of the retention mechanism. the inclined sliding surface of the guide rail. This leads to an interaction with the inclined clamping portion of the end plug which presses the end cap out of the insertion slot in a direction on the longitudinal axis of the support pin. Preferably, sliding surfaces inclined are inclined with respect to a plane extending in the direction of insertion of the insertion groove and perpendicular to an external surface of the housing by an angle to the plane in the scale of 117 ° to 141 °. Preferred, the angle is selected on a scale of 120 ° to 122 °. In a specifically preferred embodiment, the angle of inclination is 121.1 °. These angles ensure that an interaction with the inclined fastening portions of the end plug is possible and a uniform insertion of the end plug towards the end position of the latching mechanism is ensured. In a further preferred embodiment, a prevention member is provided in the insertion groove for preventing the insertion of an end heel with incorrect dimensions. By providing this prevention member, it can be ensured that only rolls with appropriate dimensions and appropriate material are inserted towards the retention mechanism and, in addition to this, it can be ensured that a roll of material is inserted in the correct orientation when They provide different plugs at the ends of the rolls of material. It is preferred that the counter bracket be provided with a clamping boss to hold the end plug in place. its end position, the retaining protrusion of the counter bracket extending in a direction opposite to that of the clamping boss of the guide rail in the end position. Preferably, the counter bracket is pivotable inside the housing. This counter brace helps reject inappropriate end plugs and holds the appropriate end plugs reliably in an end position. 4. Brief Description of the Drawings In the following, the exemplary embodiments of the invention will be described in detail with reference to the schematic drawings, in which: Figure 1 is a schematic perspective side view of an end cap and an amplified portion of the end cap; Figure 2 is a schematic cross-section of a retention mechanism and a side view of an end cap in a first variant; Figure 3 is a side view and a perspective view of an end cap in a second variant. Figure 4 is a side view and a perspective view of an end cap in a third variant. Figure 5 is a cross section of the holding mechanism with the end cap of Figure 4 inserted therein; Figure 6 is a side view and a perspective view of the end cap in a fourth variant; Figure 7 is a cross section in front view of the retention mechanism and the end cap according to Figure 3 inserted therein; Figure 8 is a non-sectioned front view of Figure 7, Figure 9 is a top view of the arrangement of Figures 7 and 8 with portions of the retention mechanism housing cut away; Figure 10 is a cross-section of the end cap and the retention mechanism in a position of the end cap before sliding past the retaining member of the retention mechanism; Figure 11 is a cross section of the retention mechanism of Figure 10 without the end cap inserted therein; Figure 12 is a non-sectioned front view of the retention mechanism with the end cap inserted therein in the position shown in Figure 10; Figure 13 is a top view of the mechanism of retention and the end cap in a position as shown in Figures 11 and 12 with parts of the housing in the cut-off retention mechanism, Figure 14 is an enlarged view of the contact portion between a support member and the cap end in interaction with the upper guide rail and the clamping member in the insertion groove of the retention mechanism, Figure 15 is a cross section of the retention mechanism with the end cap inserted therein in a position in which the end plug slides past the upper guide rail clamping member of the retention mechanism, Figure 16 is a non-sectioned front view of Figure 15; Figure 17 is a top view of the retention mechanism with the end cap inserted therein in the position shown in Figures 15 and 16 with parts of the retention mechanism housing being cut; Figure 18 is an amplification of the contact portion between the end cap support member in interaction with the upper guide rail of the holding member in the insertion groove of the retention mechanism Figure 19 is a front view cross section of the retention mechanism with the end cap inserted therein in its end position; Figure 20 is a rear view cross-section of the retention mechanism and the end cap of Figure 19; Figure 21 is a non-sectioned front view of the retention mechanism and the end cap in the position shown in Figures 19 and 20; Figure 22 is a top view of the end cap inserted in its end position in the retention mechanism, as shown in Figures 19 to 21, the retention mechanism housing being partially broken; Figure 23 is an enlarged view showing the interaction between the end cap support portion and the upper guide rail of the insertion groove with the end cap in its end position; Figure 24 is a perspective cross section showing the end cap in its end position within the retention mechanism; Figure 25 is a perspective side view of an enlarged sectional view of an end cap with a ring-shaped structure defining a holding portion; Figure 26 is a side perspective view and an enlarged side view of an end cap with a stepped structure defining a holding portion, Figure 27 is a side perspective view and an enlarged side view of an end cap with a beveled structure defining a holding portion; Figure 28 is a side perspective view and an enlarged side view of an end cap with a cylindrical structure defining a holding portion; Figure 29 is a side perspective view and an enlarged side view of an end cap with a hemispherical structure defining a holding portion; Figure 30 is a perspective view of an end cap with a conical structure defining the holding portion; Figure 31 is a perspective view of the housing of the retention mechanism; Figure 32 is a perspective view of the upper guide rail of the insertion slot in a front view, Figure 33 is a perspective view of the side rear of the upper guide rail of the insertion slot, FIG. 34 is a top view of the upper guide rail of the insertion slot; Figure 35 is a bottom view of the upper guide rail of the insertion slot; Figure 36 shows the retention mechanism with an end cap inserted therein in a first position of the end plug in a top view with parts of the retention mechanism housing being cut; Figure 37 shows the end plug inserted towards the retention mechanism, as in Figure 36, in a second position, Figure 38 shows the end cap in the retention mechanism, as in Figures 36 and 37, in a Third position, Figure 39 shows the end plug in an end position in the retention mechanism as shown in Figures 36 to 38, Figure 40 shows the counter bracket in a perspective view, and Figure 41 shows the mechanism housing of retention in a perspective view. 5. Detailed Description of the Preferred Modes In the following description of preferred embodiments of the invention, the corresponding parts or elements in the different drawings will be denoted by the same reference numerals. Figure 1 is a schematic perspective side view of an end cap 5 to be retained in a retention mechanism 1 shown, e.g., in Figure 2. Figure 1 also shows an amplified view of a relevant portion of the end plug 5. The end plug shown in Figure 1 is a general illustration of the end cap of the present disclosure. The end cap 5 has a receiving portion 60 to be received in a roll of material, in other words with dimensions to fit in a hollow core (not shown) of a roll of material (not shown), in particular a roll of thin paper material such as paper towels or toilet paper. The receiving portion comprises a cylindrical portion 62 and a plurality of ribs 64 that expand radially from the cylindrical portion 62. The hollow core of the roll of material fits into the zircons at the top of the ribs 64 which they expand radially. A finger portion 66 that also extends radially from the cylindrical portion 62 of the receiving portion 60 serves to retain the roll of hypocaust material in place when the end cap fits toward the core. The nail portions 66 extend beyond the radial expansion of the ribs so that they enter the core material in order to secure the end plug in the core. The end plug 5 comprises a support member 70 to be inserted towards the retaining mechanism, the support member 70 extending away from the receiving portion in the axial direction of the end plug 5. The support member 70 has a support pin 80 which comprises a counter surface 82 which is oriented in the direction of the receiving portion 60. The counter surface 82 of the support pin 80 is formed by a first portion 84 of the support pin of a first external diameter di springing back towards a second portion 86 of the support pin having a diameter d? external, while the first diameter di is greater than the second diameter d2 second. The counter surface 82 is located between the first portion 84 and the second portion 86 of the support pin 80. The contra The surface 82 can have different shapes and can be inclined with respect to the longitudinal axis of the support pin, perpendicular to the longitudinal axis of the support or beveled pin 80. Additionally, the support pin 80 includes a third portion 88 of a third diameter d3 exterior, while the third diameter d3 exterior shown in the embodiment is equal to the first diameter di. The second portion 86 of the support pin 80 is located between the fastening portion and the first portion 84 of the support pin 80. An end face 680 is present which is directed against the counter surface 82 of the support pin 80, the end face being adapted to abut against an external wall of the retention mechanism. A first surface 90 'and a second surface 90"are shown, which enclose a zone 900. The zone 900 corresponds to the area within which the fastening portion 950 for holding the end plug in an end position can be positioned so that the end cap 5 can be held at an end position 250 in the retention mechanism 1. In this overview of Figure 1, a specific geometric structure defining the clamping portion is not shown, however, a number of structures conceivable geometries defining the fastening portion are shown and described in the following figures. The fastening portion is defined as the portion of the support member 70 which serves to hold the end plug in the end position 250 in the latch mechanism 1. Consequently, an interaction between the plug end support member 70 and a retaining member 220 of the latch mechanism 1 (see below, eg, Figures 30 to 34), occurs in the fastening portion. The first surface 90 'intercepts at a position 910 intersecting with the support pin 80 in the third portion 88 of the support pin 80. In particular, the intersection position 910 of the first surface 90 'with the support pin 80 is spaced from the longitudinal axis 500 and the end cap 5 by a distance corresponding to the outer diameter di of the third portion 88 of the pin 80 of support and is spaced from the end face 680 of the end cap 5 by a distance d. In a preferred embodiment, the distance d is selected to be 2 mm and the third external diameter d3 is selected to be 5 mm. The first surface 90 'extends towards the face 680 from the intersection position 910 and is inclined with respect to the longitudinal axis 500 of the support pin 5 by an angle of 117 °. The second surface 90 '' also extends towards the end face 680 from the intersection position 910 but is inclined with respect to the longitudinal axis 500 of the support pin 80 by an angle of 141 °. The zone 900 between the first surface 90 'and the second surface 90", and also the face 680 of the tread, symbolizes the different possible positions of a holding portion of the support member 70. As will be shown in the following embodiments, particularly in the embodiments of the end cap shown in Figures 2 to 6 and h 25 to 30, various solutions for the structure that provides a fastening portion 950 are conceivable that provide a reliable fastening function. in the retention mechanism 1. In particular, the embodiments shown in the aforementioned Figures all have at least one fastening portion 950 that is positioned in the respective zone 900. In other words, the position of the holding portion is configured between the first surface 90 'and the second surface 90".

It will be appreciated that the zone 900 showing the possible positions of the fastening portions of the end cap corresponds directly to a combination of the embodiments shown in Figures 4 and 6, which define the end positions of the fastening portion. In particular, the fastening portion 950 of Figure 4 corresponds to the first surface 90 'and the fastening portion 950 of Figure 6 corresponds to the second surface 90"in Figure 1. In other words, Figure 4 and Figure 6 define the end positions of a fastening portion and, at the same time, enclose the zone 900 as defined with respect to Figure 1. In other words, the zone 900 can be obtained that simply remain on the end plugs shown in Figures 4 and 6. The embodiment shown in Figure 3 with a fastening portion 950 that is inclined with respect to the longitudinal axis 500 of the support pin 800 by means of ai = 121.1 ° is another example of a one-way embodiment. holding portion 950 that is directly located within zone 900 in Figure 1. It will be appreciated that a fastening portion will be understood to be located in the defined area between the first surface and the second surface if when less than s a section of a fastening portion is placed inside of this area. Accordingly, a fastening portion will be disposed which is positioned within the first surface and the second surface if it also extends beyond these surfaces. However, the holding function for holding the end plug in an end position in the latching mechanism 1 will occur essentially in the sections of the holding portions that are confined between the first surface and the second surface. In an embodiment that is not shown, the end face 680 of the end cap 5 is structured so as to comprise recesses. However, the end face 680 still defines a contact plane that serves to bump against an external wall of the retention mechanism in the same manner as explained for the end face 680 of the explicitly shown embodiments. In particular in a mode that uses the recesses in the end face 680 in order to save material, the portions of the end face 680 that extend further towards the external wall of the retention mechanism when the end cap 5 is inserted towards The retention mechanism defines this contact plane. The contact plane could be defined, e.g., by a flange extending around the circumference of the end face.

Figure 2 is a cross section through a retention mechanism 1, and a side view of an end cap 5 that can be retained in the retention mechanism 1. The latching mechanism 1 comprises a housing 10 which is preferably made of a molded plastic material. The housing 10 comprises an insertion groove 20 for inserting the support member 70 of the end cap 5. A counter bracket 30 is pivotally disposed within the housing 10 and can pivot about a pivot axis 12. The counter bracket 30 is prestressed towards an insertion position by means of a spring 34 which is shown schematically in Figure 1. The insertion groove 20 is formed by an upper guide rail and a lower one in the housing, the upper guide rail 200 of which is shown in the cross-section of Figure 1. The insertion groove 20 has an end position 250 in which the end cap 5 is retained in its end position. The end plug 5 of this embodiment corresponds basically to that shown and described in Figure 1 and includes a fastening portion 950 for holding the end plug in an end position in the retaining mechanism 1, the holding portion 950 being disposed between the receiving portion 60 and the support pin 80. The holding portion 950 is inclined with respect to the longitudinal axis of the support pin by an angle in the scale of 117 to 141, in particular 120 to 122, preferably 121.1. Consequently, the fastening portion 950 is completely within the zone 900 defined with respect to the end cap described in Figure 1 and also acts in its entirety as the fastening portion 950 for holding the end plug in the retaining mechanism. The holding portion 950 and the counter surface 82 are arranged so as to be inclined in opposite directions. In other words, the two surfaces are arranged to constitute a potential well. The interaction of the end plug 5 with the retention mechanism 1 will become more apparent in the description of the following Figures 6 to 32. Briefly, the clamping portion 950 interacts with the respective sliding surfaces of the guide rails and interacts with a clamping member in order to hold the end plug 5 in its end position 250. The counter surface 82 is in contact with the guide bracket 30 and interacts with the end section 310 of the guide bracket 30. In the end position 250, the clamping force of the end plug 5 in the retention mechanism 1, due to the specific geometry of the retention mechanism 1 is in interaction with the end cap support member in the range of 15N to 19N . This very narrow band of clamping force is necessary, on the one hand, to keep the roll of material in place and securely hold the roll of material in the end position 250 but, on the other hand, allow easy insertion and removal of the roll of material when the roll is held. what to exchange Figure 3 is a side view and a perspective view of an end cap 5. The end cap 5 is basically identical to the end cap shown in Figure 2. The angle ai which is measured between the longitudinal axis 500 of the end cap 5 and the holding portion 950 is 121.1 °. The longitudinal axis 500 of the end cap 5, at the same time, is the longitudinal axis of the support pin 80. The additional dimensions shown in Fig. 3 are d? = 5.0 + -0.2mm, d2 = 3.5 + -0.1mm, d ^ = 3.5 + -0.1mm, d4 is the front end face diameter of the pin 80 of support that is reached at the end of the bevel 85. A limiting member 68 is disposed between the receiving portion 60 and support member 70. The limiting member 68 is for limiting the insertion depth of the receiving section 60 of the end plug 5 towards the hollow core of the roll of material. In other words, the limiting member 68 serves the purpose of bringing the end cap 5 to a defined position with respect to the hollow core of the roll material. The face of the limiting member 68 facing the support pin 80 serves, at the same time, the end face 680 of the end cap. The support member 70 exhibits the following dimensions in the longitudinal direction of the longitudinal axis 500. The length li of the holding portion 950 in the longitudinal direction is 2 mm. The length 12 of the third portion 88 of the support pin 80 is 2.5 mm. The length 13 of the second portion 86 of the support pin 80 is 5 mm. The length of the most distant portion of the support pin 80 is 1 < ¡+ Ls = 5 mm, while the first portion 84 has a longitudinal extension of 14 = 3.5 mm and the beveled portion 85 has a longitudinal extension of 15 = 1.5 mm. A radius of a bevel 89 between the second portion 86 and the third portion 88 of the support pin 80 has a radius of 0.5 mm. The same radius may be present in the foot area of the fastening portion.

The bevel 89 is particularly helpful during the molding process of the end plug 5 since an air bubble that appears randomly embedded in the smaller diameter portion 86 of the support pin 80 can be moved by providing the bevel 89 to the 84 largest diameter portion. In this way, the bevel 89 helps improve the stability of the end cap support pin. Figure 4 shows another end plug 5 '. The end cap 5 'shown in Figure 4 is almost identical to that shown in Figure 2, except that the holding portion 950 is inclined towards the longitudinal axis 500 of the support pin 80 by an angle of a2 of 117 °. The interaction of the fastening portion 950 of this end cap 5 'with the retaining mechanism 1 can be seen in Figure 5. The interaction of the fastening portion 950 with the upper guide rail 210, in particular with a bulge 220 for securing the upper guide rail 210, leads to a situation in which the end face 680 'of the end plug 5' is lifted out of the external surface of the retaining mechanism 1 in order to overcome the clamping boss 220 . Figure 6 shows still another plug 5"of end, which is substantially identical to the end caps shown in Figures 3 and 4, except for the angle of inclination of the holding portion 950. In the third embodiment of the end cap 5", the angle of inclination a3 of the fastening portion 950 is 141 ° From the discussion of Figures 3 to 6, it follows that the position of the fastening portion for holding the cap The extremity in the end position in the retention mechanism is of special importance For a position of the clamping portion in a zone that is defined between two surfaces with angles of 117 ° and 141 °, the end buffer, on the one hand , it can be slid into the end position and, on the other hand, it can be clamped with a reasonable clamping force at the end position of the retention mechanism.This is of particular interest since, on the one hand, the clamping force it has to be high enough to hold the end cap reliably in its end position during use, but on the other hand, the loading and removal of the rolls has to be easy in order to give the operator the perception of an exchange free of impediment of the rolls and, additionally, prevent the clamping mechanism and the end plug from being destroyed.

Figure 7 is a front view cross-section of the latch mechanism 1 and the end cap 5 (with a holding portion of an inclination angle of 121.1 °) inserted towards the latch mechanism 1. Here, a situation is shown in which the end plug 5 is inserted into the insertion slot 20 and the counter surface 82 of the support pin 80 is engaged with the counter bracket 30, and consequently, pulls the counter bracket 30 in the direction of the end plug 5. The counter surface 82 exerts a force against the counter bracket 30 in the direction of the longitudinal axis 500 of the support pin 80, the force acting perpendicular to the direction of insertion of the insertion groove 20 and resulting in oscillation of the counter brace towards the outer wall 100 of the housing 10. The outer surface 110 of the outer wall 100 of the housing 10 and the end face 680 of the limiting member 68 are in contact with each other and provide the reaction force to the pulling force exerted towards the counter bracket 30. The insertion groove 20 is formed in the outer wall 100 of the housing 10 and comprises a lower rail 200 and an upper rail 210 while the lower rail 200 has an inclined sliding surface 202 and the guide rail 210 upper has an inclined sliding surface 212. The inclined sliding surfaces 202, 212 are inclined so that their angle of inclination substantially corresponds to the angle of inclination of the fastening portion 950 of the support member 70 of the end plug 5. In the present case this means that the inclined sliding surfaces 202, 212 are inclined by an angle of 121.1 °. Depending on the end cap used, the inclination could also be selected to be on a scale of 117 ° to 141 °, and in particular 120 ° to 122 °. In the position of the end cap 5 shown in Figure 7, the inclined surfaces 202, 212 of the insertion groove 20, however, do not necessarily strike against the fastening portion 950 of the end cap 5. Figure 8 shows the end cap 5 in the retention mechanism 1 in the same configuration as that shown in Figure 7, but in a non-sectioned view. In this Figure it is clearly visible how the support pin 80 enters the insertion groove 20 and as it is guided along the insertion groove so that the end cap 5 can only slide along the groove 20. of insertion Figure 9 is an illustration of the end cap in a cross-section of top view, the end cap 5 is further slid into the insertion groove of the retention mechanism 1. In this illustration it becomes clearer how the interaction between the counter surface 82 of the support pin 80 with the counter bracket 30 brings the counter bracket 30 further and further in an orientation towards the external wall 100 of the housing 10. In other words, the interaction of the counter surface 82 of the support pin 80 and the counter bracket 30 pivots the counter bracket 30 about the piloting axis 32 of the counter bracket 30 towards the external wall 100 of the housing 10 so that, in the end position of the counter bracket 30, the counter bracket 30 is parallel to the outer housing wall 100 and, thus, parallel to the insertion direction of the end cap 5. Figures 10 to 14 show the end cap 5 and the retention mechanism 1 in different views in a position in which the end cap 5 moves further towards the end position. In particular, in Figure 10 a situation is shown in which the end cap moves this distance that the inclined surface 212 of the upper rail 210 begins to bump against the fastening portion 590 of the end cap.

Figure 11 is a cross-section through the retention mechanism 1 alone, showing the external wall 100 of the retention mechanism with the upper guide rail 210, while the inclination of the inclined portion 212 varies as it extends towards the end position 250 of the retention mechanism. Figure 12 shows the end plug 5 in the retention mechanism 1 in a non-sectioned front view, the interaction between the inclined holding portion 950 of the end plug 5 and the upper guide rail 210 and in particular the inclined surface 212 of the upper guide rail 210 being clearly visible. Figure 13 shows the same position of the end plug 5 in a cross section of top view. The end cap 5 moves towards the end position 250. The end position 250 is defined, as will be evident in the following drawings, by a clamping boss 220 that is formed in the upper guide rail 210. The interaction of the upper guide rail 210 and the holding protrusion 220 with the support member 70 of the end plug 5 is shown in greater detail in Figure 14. Figure 14 shows the upper guide rail 210 and the protrusion 220 of FIG. subjection. The inclined surface 212 of the upper guide rail 210 changes its inclination slightly towards the holding protrusion 220. However, it is more important that the holding protrusion 220 extends in the direction parallel to the longitudinal axis 500 of the support pin. In this way, the interaction between the clamping boss 220 and the end plug 5, in particular between the clamping portion 950 and the clamping boss 220, leads to a movement of the end plug 5 in the direction of the longitudinal axis 500 of the pin 80. of support so that the end face 680 of the limiting member 68 is lifted from the outer surface 110 of the front wall 100, as will be explained with reference to Figure 15 below. In other words, the holding protrusion 220 exerts a force towards the inclined holding portion 950 which moves the end cap 5, in particular the end face 680 of the end cap, in a direction away from the external surface 110 of the end cap. housing 10 of the retention mechanism 1. On the other hand, the counter surface 82 of the support pin 80 interacts with the counter bracket 30 (not shown in Figure 14) so that an elastic tension builds up between the holding protrusion 220 and the counter brace 30.

Figures 15 to 18 show the end plug 5 in the retention mechanism 1 in still a further moved position in which the external surface 680 of the limitation member 68 of the end cap 5 is lifted from the outer surface 110 of the mechanism 1 retention. This is due to the fact that the fastening portion 950 of the end cap 5 abuts against the holding protrusion 220 of the upper guide rail 210. The counter bracket 30 is pressed against a portion of the housing 10 by the interaction between the holding portion 950 and the holding protrusion 220 and the counter surface 82 and the counter bracket 30 so that an elastic tension acting on the member is accumulated. 70 end cap support. In this situation, the insertion force of the end plug 5 towards the insertion slot 20 is greater than in the positions described above. In other words, an operator who inserts the end plug 5 feels quite a resistance acting against the additional insertion of the end cap. In order to overcome this resistance, which is due to the superior friction and elastic tension, the operator needs to push the stronger end plug 5 towards the retaining mechanism 1. In other words, the operator may feel that the end cap is almost in its end position but is still movable in the insertion direction. Figure 16 shows the same position of the end cap 5 in the retention mechanism 1 shown in Figure 15, but in a non-sectioned front view. Here, again, it is clearly visible that the front face 680 of the end plug 5 rises from the external surface 110 of the housing 10 of the retaining mechanism due to the interaction of the clamping boss 220 and the clamping portion 950 of the plug extreme. Figure 17 shows the same situation as in the Figures 15 and 16, but in a top view with parts of the housing broken. The upper guide rail 210 and the holding protrusion 220, which interacts with the holding portion 950 of the support member 70 is shown. It should be noted that the counter brace 30 also comprises clamping protuberances 320 extending in a direction opposite to that of the clamping boss 220 of the upper guide rail 210. The retaining protuberances 320 of the counter bracket 30 interact with the counter surface 82 of the support pin 80 of the end plug 5. Accordingly, the distance between the counter surface 82 of the support pin 80 and the contact area of the upper guide rail 210 with the fastening portion 950. of the end cap 5 is increased so that an elastic tension accumulates between states two facing surfaces. The dimensions of the clamping boss 220 of the upper guide rail 210 and the clamping boss 320 of the counter bracket 30 are balanced so that the end plug 5 can slide towards its end position on the protuberances 220, 320 of clamping with a pushing force that is not unduly high. Figure 18 shows, in an amplified view, the interaction of the fastening portion 950 of the end plug 5 with the holding protrusion 220 of the upper guide rail 210 at the position of the end plug 5 in the latching mechanism 1, as shown in Figure 17. Figures 19 to 24 show end plug 5 in its end position in retention mechanism 1. The end face 680 abuts against the external surface 110 of the housing 10 again. In other words, the end plug 5 has overcome the clamping protuberances 220, 320 discussed in Figure 17 and has moved again towards a position that abuts against the housing 10 of the retention mechanism 1. The counter brace 30 has again jumped to a position where it is parallel to the outer wall 100 of the retention mechanism 1. Figure 19 shows the cross section of the end cap 5 in the retention mechanism 1 in a front view in cross section. Figure 20 shows the end plug 5 in the retention mechanism 1 in the same position as the end cap in a rear side view. In this rear side view, the holding protrusion 220 of the upper guide rail 210 is visible which interacts with the holding portion 950 of the end cap 5 and prohibits the end cap 5 from leaving the end position. This same position of the end cap 5 in the retaining mechanism 1 is also shown in a front view not shown in Figure 21. Here, it becomes clearly evident that a part of the holding portion 950 is "hidden" behind the boss 220 for securing the upper guide rail 210 and, in this manner, holds the end plug 5 in its end position. Figure 22 shows the end plug 5 in the retention mechanism 1 in a top view with portions of the housing cut away. The holding protrusion 220 of the upper guide rail 210 maintains the end cap 5 through interaction with the holding portion 950 in its end position. In addition, the interaction of the contra The surface 82 of the support pin 80 with the boss projection 320 of the counter bracket 30 also holds the end cap in the end position. Figure 23 shows the interaction of the upper guide rail 210 with the holding protrusion 220 and the fastening portion 950 of the end cap 5. It should be noted that the holding protrusion 220 is asymmetric. This asymmetric shape is formed so that, in the direction of insertion, the holding protrusion 220 has a softer slope than in the direction of removal. In other words, the widest portion of the holding protrusion 220 is reached in the insertion direction through a longer distance than in the opposite direction. This leads to a situation in which the end plug 5 is held firmly in the end position and a clamping force of 18N to 19N is exerted towards the end plug 5. Figure 24 shows the end cap 5 and the retention mechanism 1 in a perspective cross section. The lower rail 200 and the upper rail 210 of the insertion slot 20 are shown. In the upper rail, the holding protrusion 220 is also shown. The counter bracket 30 which is pivotable about the pivot axis 32 is shown as the protuberance 320 of securing the counter bracket 30. The insertion groove 20 is formed between the lower guide rail 200 and the upper guide rail 210. In the entry section 22 of the insertion slot 20, a prevention section is provided comprising a first prevention member 280 and a second prevention member 282. The prevention members 280, 282 are formed so that only an end cap 5 with a support pin 80 of the correct dimensions can be inserted into the insertion slot 20. To achieve this, the first prevention member 280 ensures that the outer diameter of the first portion 84 of the end cap 80 has a correct external diameter. If the outer diameter of the first portion 84 of the end cap is too large, the support pin 80 can not pass through this first prevention member 280 of the prevention section. A second prevention member 282 of the prevention section ensures that the second portion 86 of the end cap support pin 80 has the correct outer diameter. If the external diameter of the second portion 86 of the support pin is too large, the support pin can not slide past this second prevention member 282 of the prevention section. A third mechanism of prevention is present in the counter bracket 30 in which the guide groove in the counter bracket 30 is dimensioned so that only one support pin with the correct outer diameters can be retained in the counter bracket 30. In particular, the guide groove in the counter bracket 30 it has dimensions such that a support pin with a too large diameter of the second portion 86 of the support pin can not be inserted towards the guide groove. Further, if the first portion 84 of the support pin 80 is too small, a holding portion 82 of the support pin 80 can not be brought into contact with the rails forming the guide groove in the counter bracket 30 and the counter bracket. 30 will not be pivoted towards the outer wall of the housing 10. Subsequently, a support pin with a counter surface 82 of the wrong dimension will fall out of the retention mechanism through an outlet section 24 of the insertion slot 20, as shown in FIG. you can see in Figure 31. This support pin of incorrect dimensions, consequently would be rejected by the retention mechanism 1. In Figure 25, another alternative of the end plug is shown in a perspective side view and an amplified sectional view of its support member 70. The fastening portion 950 is defined by a ring-like structure 980 that extends around the third portion 88 of the support pin 80. It will be appreciated that the fastening portion 950 has at least one diameter d5 which is greater than the third external diameter d3 of the third portion 88 of the support pin 80. Additionally, the first surface 90 'and the second surface 90"are shown schematically in order to illustrate that the fastening portion 950 is positioned within the zone 900 and, consequently, between the first surface 90' and the second surface 90" . It will also be appreciated that the ring-shaped structure 980 is generally located closer to the end face 680 than the second portion 86 of the support pin 80. As can be seen in the Figure, the top sections of the ring-shaped structure 980 basically define the holding portion 950. In a further alternative shown in Figure 26, the end plug is provided with a stepped structure 980 'which defines at least one fastening portion 950. It will be appreciated that the fastening portions 950 are basically defined by the corner portions of the step structure 980 '.

In the amplified perspective side view of the support member 70, the first surface 90 'and the second surface 90"are shown schematically to illustrate that the fastening portions 950 are located in a zone 900 between the first surface 90' and the second surface 90". It will also be appreciated that the step structure 980 'is located closer to the end face 680 than the third portion 88 of the support pin 80. In addition to this, it is immediately apparent from the Figure that the holding portion 950 has at least one outer diameter d5 that is larger than the outer diameter d3 of the third portion 88 of the bearing pin 80. Figure 27 shows yet another embodiment of the end cap with a chamfered structure 980"defining at least one fastening portion 950. As in Figures 26 and 27, it is schematically shown that the fastening portion 950 is positioned in a zone 900 between the first surface 90 'and the second surface 90". In addition, the beveled structure 980"sits closer to the end face 680 than the third portion 88 of the support pin 80. In another embodiment of the end cap shown in Figure 28, a substantially cylindrical structure 980 '' 'is provided which defines at least a portion 950 clamping. Here, again, the first surface 90 'and the second surface 90"are shown schematically defining the zone 900 in which the fastening portion 950 is placed. Furthermore, it is immediately apparent that the outer diameter d5 of the cylindrical portion 980 '' 'defining the holding portion 950 has a diameter greater than the diameter d0 of the third portion 88 of the bearing pin 80. Figure 29 shows still another embodiment of the end plug. In this embodiment, a substantially semiconducting structure 980 '' '' is provided which basically defines at least one fastening portion 950. Here, again, the holding portion 950 is placed in a zone 900 defined by the first surface 90 'and the second surface 90". The fastening portion 950 is preferably defined by at least a tangential portion in the hemispherical structure 980"''. Figure 30 shows still another embodiment of an end cap to be held in the retention mechanism 1. The end cap of Figure 30 shows a truncated cone structure 980 '' '' 'which defines at least one holding portion 950. The truncated cone structure 980 '' '' differs from the truncated cones shown in Figures 2 to 6 in that the intersecting position 910 ' the surface of the truncated cone structure 980 '' '' and the support pin 80 is separated from the end face 680 by less than 2 mm. Consequently, the angle a4 between the surface of the truncated cone structure 980"'' 'and the longitudinal axis 500 of the support pin 80 is less than 117 °. However, at least one fastening portion 950 is positioned within the zone 900 which is defined by the first surface 90 'and the second surface 90". The holding portion 950 carries the clamping forces even when the angle is less than 117 °. Figures 31 to 35 show the upper guide rail 210 of the retention mechanism 1 in different views and perspectives. The holding protrusion 220 has, in the insertion direction X, a smoother inclination than in the opposite direction. In particular, the section 222 extends through a longer distance than the section 224. An end cap inserted towards the retaining mechanism, consequently, will be fastened with its holding portion 950 behind the more inclined section 224. It has been found that the interaction between the inclined clamping portion 950 of the end cap support member with the specific shape of the clamping boss 220 leads to improved handling of the insert from the end cap to the retention mechanism. In particular, the end plug can be slid to the end position easily due to the interaction of the inclined surface with the softer inclined portion 222 of the holding protrusion 220. The end plug then jumps to its end position and sits there firmly, while the interaction between the inclined clamping portion of the end plug and the steeper inclined portion 224 of the clamping boss 220 results in a clamping force of 18N and 19N. This particular clamping force has been found to be advantageous since it keeps the end cap and the thin paper roll mounted on the end cap in a fixed position during use, but allows, on the other hand, the easy replacement of the end cap. Roll thin paper by simply pulling the thin paper roll out in a direction opposite to the insertion direction. In this way, the removal process works substantially in the same way as insertion but backwards. Figures 36 to 39 show, once again, the process of inserting the end cap 5 into the retention mechanism in different perspective. Figure 36 is a top view showing the end cap and retention mechanism 1 with parts of the housing of the snap mechanism 1 broken. The end plug 5 is shown in a position before actually entering the insertion slot. The support pin 80 sits in an inlet section 22 of the insertion groove. The prevention members 282 and 280 that were described with respect to Figure 23 are shown. In addition, the counter bracket 30 is shown in an insertion position pivoted about the pivot axis 32. Figure 37 shows the end cap 5 in a position slid toward the serration groove in the insertion direction X. The counter surface 82 of the support pin 80 interacts with the counter bracket 30 so that the counter bracket 30 is pivoted about the piloting axis 32 towards the external wall 100 of the housing 10. The fastening portion 950 of the end cap 5 began to interact with the boss 220 of the upper guide rail 210. Figure 38 shows the end plug 5 in the latch mechanism 1 in a third position in which the fastening portion 950 of the end cap 5 interacts with the boss 220 of the upper guide rail 210 so that the face 680 end of cap 5 of The end is lifted from the outer surface 110 of the housing 10. The counter surface 82 of the bearing pin 80 also interacts with the boss 320 of the counter bracket 30 so that an elastic tension builds up between the retaining portion 950 and the retaining portion 950. against surface 82 by lightly deformation of counter brace 30 and / or by moving counter brace 30 beyond its fastening position in a position in which it exerts more tension towards counter surface 82. Figure 39 shows end plug 5 in its end position in the retention mechanism 1. The end face 680 abuts against the external surface 110 of the housing 10 and the holding portion 950 of the end cap 5 slides past the boss 220 of the upper guide rail 210. The counter surface 82 of the support pin 80 also moves beyond the boss 320 of the counter bracket 30. Consequently, the counter bracket 30 jumped to its end position, as can be clearly seen by comparing the orientation of the counter. bracket in Figures 31 and 32. The end cap 5 sits, in this position, firmly in the end position by the interaction of the portion 950 for fastening the end cap 5 with the holding protrusion 220. Figure 40 shows counter brace 30 in a perspective view. The counter bracket 30 is pivotable about a piloting axis 32 that is formed by the piloting members 32 'and 32". The counter bracket 30 has a guide groove 360 which is formed by a lower guide rail 362 and an upper guide rail 364. The guide slot 360 has dimensions to interact with the counter surface 82 of the support pin 80, as shown in the previous Figures. In other words, the guide slot 360 has a width that adjusts the lower diameter of the second portion 86 of the support pin and is able to interact with the counter surface 82. A guide protrusion 320 is formed in the guide rail 362 lower and in the upper guide rail 364. The holding protrusion 320 has a uniform section leading to its wider portion which is located in the direction of insertion and a more pronounced portion which is located in the opposite direction. The guide bracket 30, further, includes a spring support 340 for accommodating a spring 34, as shown in Figure 1. + A fourth prevention member 286 is provided downstream of the guide slide 360 in the form of a hood which prevents the insertion of a guide pin 80 of an end plug 5 that is too long. Said guide pin too long, consequently, it will be rejected by the third portion 286 of prevention. Figure 41 shows a perspective view of the housing 10 of the retention mechanism 1. The insertion groove 20, which is formed by the lower guide rail 200 and the upper guide rail 210 is clearly visible. The upper guide rail 210 has a clamping boss 220 formed therein. The insertion groove 20 has an inlet section 22 and an outlet section 24. The output section 24 serves to reject support pins of incorrect dimensions. In particular, the support pins having too small dimensions fall out of the insertion groove 20 through the outlet section 24. Figure 41 also shows that the prevention members 280 and 282 are also present on the upper side of the insertion slot 20.

Claims (38)

1. CLAIMS 1. End cap for a roll of material to be inserted in a retention mechanism, the end cap comprising: a receiving portion to be received in the roll of material, an end face to make contact with the retention mechanism; a support member to be inserted into the retaining mechanism, the support member comprising: a support pin comprising a counter surface facing the end face; and - at least one fastening portion for holding the end plug in an end position in the retaining mechanism, the fastening portion forming part of the support member and being positioned within a span defined by: - a first surface that it extends towards the end face from a position of intersection with the support pin, the first surface being inclined with respect to the axis longitudinal of the support pin by an angle of 117 °; and - a second surface extending towards the end face of the intersecting position, the second surface being inclined with respect to the longitudinal axis of the support pin by an angle of 141 °.
2. 2. End cap according to claim 1, wherein the intersection position is separated from the end face by 2 mm.
3. 3- End cap according to claim 1 or 2, wherein the end face defines a contact plane for contacting the retention mechanism, the contact plane facing the counter surface.
4. 4. - End cap according to claim 3, wherein the intersection position is separated from the contact plane by 2 mm.
5. 5. End cap according to any of the preceding claims, wherein the second surface is inclined with respect to the longitudinal e of the support pin by an angle of 119 °.
6. 6. End cap according to claim 5, wherein the fastening portion is further positioned in an area defined by: a third surface extending towards the end face from the intersecting position, the third surface being inclined with respect to to the longitudinal axis of the support pin at an angle of 122 °; and a fourth surface extending towards the end face from the intersecting position, the fourth surface being inclined with respect to the longitudinal axis of the support pin by an angle of 141 °; the fastening portion being positioned either between the first surface and the second surface or between the third and fourth surface.
7. 7. End cap for a roll of material to be inserted in a retention mechanism, the end cap comprising: a receiving portion to be received in the roll of material; an end face defining a contact plane for contacting the retention mechanism; - a support member to be inserted towards the retaining mechanism, the end face being located between the support member and the receiving portion, the support member comprising: a support pin comprising at least a first portion of a first outer diameter, a second portion of a second outer diameter, and a third portion of a third outer diameter, the second portion being located between the first portion and the third portion, and the second outer diameter being smaller than the first outer diameter and the outer diameter. third outer diameter, wherein the third portion is positioned closer to the end face than the first portion; and at least one fastening portion for holding the end plug in an end position in the retaining mechanism, the fastening portion forming part of the support member and being located closer to the end face than the second portion and the third portion of the support pin, wherein the holding portion has at least one external diameter that is greater than the first, second and third outer diameter of the support pin.
8. 8. End cap according to any of the preceding claims, wherein the holding portion is defined by a truncated cone, the base of the truncated cone being located adjacent to the end face and the upper part of the train cone being located adjacent to the support pin.
9. 9. End cap according to claim 8, wherein the upper part of the truncated cone has an external diameter that corresponds sudbstantially to the third external diameter of the support pin, in particular a diameter of 5 mm.
10. 10. End cap according to claim 8 or 9 in combination with claim 1, wherein the external surface of the truncated cone is inclined with respect to the longitudinal axis of the support pin by an angle of less than 117 °.
11. 11. End cap according to claim 10, wherein the external surface of the truncated cone is intercepted with the support pin in a position separated from the end face by less than 2 mm, in particular less than 1 mm.
12. 12.- End cap in accordance with the claim 10, wherein the external surface of the truncated cone is intercepted with the support pin in a position separated from the contact plane by less than 2 mm, in particular less than 1.5 mm.
13. 13. End cap according to any of the preceding claims, wherein the fastening portion is rotationally symmetrical with respect to the longitudinal axis of the support pin.
14. 14. End cap according to any of the preceding claims, wherein the fastening portion is defined by a ring-shaped structure located on the end face.
15. 15. End cap according to claim 14, wherein the top sections of the ring-shaped structure define the holding portion.
16. 16. End cap according to claim 14 or 15, wherein the ring-shaped structure is located closer to the end face than the second portion of the support pin.
17. 17. End cap according to any of the preceding claims, wherein the holding portion is defined by a stepped structure located on the end face.
18. 18. End cap according to claim 17, wherein at least one corner portion of the step structure defines the holding portion.
19. 19. End cap according to claim 17 or 18, wherein the stepped structure is located closer to the end face than the third portion of the support pin.
20. 20. End cap according to any of the preceding claims, wherein the fastening portion is defined by a beveled structure located on the end face.
21. 21. End cap according to claim 20, wherein at least a portion of the beveled structure defines the holding portion.
22. 22. End cap according to claim 20 or 21, wherein the beveled structure is located closer to the end face than the third portion of the support pin.
23. 23. End cap according to any of the preceding claims, wherein the fastening portion is defined by a basically cylindrical structure located on the end face.
24. 24. End cap according to claim 23, wherein at least one corner portion of the substantially cylindrical structure defines the holding portion.
25. 25. end cap according to claim 23 or 24, wherein the substantially cylindrical structure is located closer to the end face than the third portion of the support pin.
26. 26. End cap according to any of claims 23 to 25, wherein the cylindrical structure bears a bevel that defines the holding portion of the cylindrical structure.
27. 27. End cap according to any of the preceding claims, wherein the fastening portion is defined by a hemispherical structure and / or other substantially spherical surface.
28. 28. End cap according to claim 27, wherein at least a tangential portion of the semi-silk structure and / or other substantially spherical surface defines the fastening portion.
29. 29. End cap according to claim 27 or 28, wherein the hemispherical and / or other substantially spherical surface is located closer to the end face that the third portion of the support pin.
30. 30. End cap according to claims 7 to 29, wherein the position of the holding portion is configured by: a cylindrical surface with an external diameter corresponding to the outer diameter of the third portion of the support pin; and a first surface extending from a position of intersection with the external diameter of the third portion of the bearing pin towards the end face, the first surface being inclined with respect to the longitudinal axis of the support pin by 117 °.
31. 31. End cap according to claim 30, wherein the position of the fastening portion is located between the first surface and a second surface extending from the intersecting position toward the end face, the second surface being inclined with respect to the longitudinal axis of the support pin by an angle of 141 °.
32. 32. End cap according to claim 30 or 31, wherein the intersection position it is spaced by 2 mm from the contact plane.
33. 33.- End cap according to claim 32, wherein the first surface intercepts the contact plane spaced from the cylindrical surface by 4 mm.
34. 34. End cap according to any of the preceding claims, wherein the end face comprises recesses.
35. 35. End cap according to any of the preceding claims, wherein the end face comprises a flange defining the contact plane.
36. 36. End cap according to any of the preceding claims, wherein the counter surface is disposed between the first portion and the second portion of the support pin.
37. 37. End cap according to claim 36, wherein the counter surface extends in a plane substantially perpendicular to the longitudinal axis of the support pin.
38. 38. End cap according to any of the preceding claims, wherein the end cap comprises a limiting member for limiting the insertion depth of the receiving portion towards the roll of material, one face of the limiting member defining the end face. 39.- Use of an end cap according to any of the preceding claims to fit in the hollow core of a roll of material, in particular a roll of paper towel or a roll of thin paper. 40.- Roll of material for use in a retention mechanism that is provided, at least at one longitudinal end of the roll, with an end cap according to any of claims 1 to 38. 41.- Retention mechanism for a Dispatcher for retaining an end cap of a roll of exchangeable material, the retention mechanism comprising: a housing with an insertion groove for inserting an end cap support member, the insertion groove being disposed between a guide rail upper and a lower guide rail, the guide rails having at least one inclined sliding surface for interaction with an inclined holding portion of the support member; a clamping member formed in at least one of the guide rails, the clamping member being formed so as to interact with the inclined clamping portion of the abutment member for retaining the end plug in an end position, and a counter brace that is disposed in the housing, the against bracket having a guide groove for guiding a support pin of the end cap support member. 42.- Retention mechanism according to claim 41, wherein the clamping member is formed on the inclined sliding surface of one of the guide rails. 43.- Retention mechanism according to claim 42, wherein the clamping member is a protrusion extending perpendicular to the insertion groove. 44.- Retention mechanism according to claim 42 or 43, wherein the clamping member has a first inclined portion disposed before a wider portion of the clamping member in the direction of insertion and a second inclined portion disposed afterwards. the wider portion of the clamping member in the insertion direction, the first inclined portion having a softer inclination than the second inclined portion. 45.- Retention mechanism according to any of claims 42 to 44, wherein the clamping member is formed by decreasing the re-inclination angle of the inclined sliding surface of the guide rail. 46.- Retention mechanism according to any of claims 41 to 45, wherein the inclined sliding surfaces are inclined with respect to a plane extending in the direction of insertion of the insertion slot and perpendicular to an external surface of the accommodation by an angle to this plane on the scale of 117 ° to 141 °. 47.- Retention mechanism according to claim 46, wherein the angle is in the scale of 1209 ° to 122 °. 48.- Retention mechanism according to claim 46 or 47, wherein the angle is 121.1 °. 49.- Retention mechanism according to any of claims 41 to 48, wherein at least one prevention member for preventing the insertion of an end cap with incorrect dimensions is provided in the insertion slot. 50.- Retention mechanism according to any of claims 41 to 49, wherein the counter bracket carries at least one clamping protrusion to hold the end cap in its end position, the clamping boss of the counter bracket extending in a direction opposite to that of the clamping boss of the guide rail in the end position. 51.- Retention mechanism according to any of claims 41 to 50, wherein the counter bracket is pivotable in the housing from an insertion position to a clamping position.