Device and method for machining a cylindrical sleeve

Abstract

The invention relates to a device (30) for machining a cylindrical sleeve Q, which has a first end-face butt edge (11), a second end-face butt edge (12), and a sleeve wall (13) extending between the first butt edge (11) and the second butt edge (12), wherein a material section (20) abuts an outer surface (14) of the sleeve wall (13) and has a projection (22) extending beyond the first butt edge (11), wherein the device (30) comprises a hollow cylinder (31) and an inner punch (32) which can be moved axially within the hollow cylinder (31), wherein the hollow cylinder (31) has a funnel-shaped opening region (35) for receiving the first butt edge (11), wherein the opening region (35) is designed to deflect the projection (22) radially inwards when the first butt edge (11) is axially inserted into the hollow cylinder (31), wherein the The inner stamp (32) has an outer edge (37),which is designed to fold the inwardly directed projection (22) towards the second impact edge (12) and press it against an inner surface (16) of the sleeve wall Q when a relative axial movement occurs between the inner punch (32) and the hollow cylinder (31). Furthermore, the invention relates to a method for machining the sleeve (10).

Description

[0001] The invention relates to a device for machining a cylindrical sleeve comprising a first end-face butt edge, a second end-face butt edge, and a sleeve wall extending between the first and second butt edges, wherein a material section rests on an outer surface of the sleeve wall, which, in an intermediate step of the sleeve manufacturing process, has a projection extending beyond the first butt edge. The invention further relates to a method for machining such a sleeve with a projection.

[0002] Such a cylindrical sleeve is described in the unpublished EP 4 442 589 A1. In its final state, the cylindrical sleeve forms the cartridge body of a cartridge from which a viscous material, such as silicone, acrylic, or an adhesive, can be dispensed using a cartridge gun. The viscous material is preferably contained in a foil pouch, which is inserted into the cartridge body and must be opened before first use. The cartridge body can be made of a thin-walled and readily recyclable material such as cardboard or paperboard.

[0003] Starting from the intermediate step described above, the excess material is folded inwards over the first butt joint and then optionally glued to an inner side of the tube wall. This section of material thus covers the first butt joint and provides effective protection against moisture penetration into the tube. The second butt joint can also be protected from moisture in the same way, either by another section of material or by a continuous section of material that extends beyond both butt joints with an overhang. According to EP 4 442 589 A1, it has been shown that a section of material covering the butt joint, even made of paper, significantly improves the moisture resistance of the cardboard tube compared to an unprotected butt joint.

[0004] Good moisture resistance is particularly important when the cardboard tube is used as the cartridge body for silicone, acrylic, or other building materials on a construction site, as it is generally unavoidable that material supplies are exposed to the elements, especially rain, for a certain period of time and / or stored in rooms with high humidity. These moisture exposures can cause the cardboard tube to swell and lose its essential properties for a cartridge body, such as dimensional stability.

[0005] Due to high demand, cartridges for viscous materials are produced in very large quantities. If the cartridge body uses the sleeve described above, whose butt joints are covered by one or more material sections in the final state, efficient and cost-effective manufacturing of the sleeve becomes particularly important.

[0006] The object underlying the invention is to propose a device for the manufacture of the sleeve by which moisture protection of the impact edge of the sleeve can be provided in a simple and cost-effective manner.

[0007] The problem underlying the invention is solved by the subject matter according to claim 1. Exemplary embodiments can be found in the dependent claims to claim 1.

[0008] According to the invention, a device is proposed by which the protrusion of the material section adhering to the outer surface of the sleeve wall, extending beyond the first butt edge, is folded over and pressed against the inner surface of the sleeve wall. The device according to the invention comprises a hollow cylinder and an inner punch that can move axially within the hollow cylinder. The hollow cylinder has a funnel-shaped opening for receiving the first butt edge. The opening is designed to deflect the protrusion radially inwards when the first butt edge is axially inserted into the hollow cylinder. The inner punch has an outer edge designed to fold the inwardly deflected protrusion towards the second butt edge and press it against an inner surface of the sleeve wall when a relative axial movement occurs between the inner punch and the hollow cylinder.By inserting the first butt edge into the device and through the interaction of the hollow cylinder and inner punch, a simple method is created to automatically fold over the protruding material section and immediately press it directly against the inner surface of the sleeve wall. Pressing the folded-over protrusion against the inner surface creates a secure bond between the folded-over protrusion and the sleeve wall, provided the material section is coated or supplied with an adhesive.

[0009] After the first butt edge has been covered by the material section using the device according to the invention, the second butt edge can also be processed accordingly. For this purpose, the sleeve can be rotated 180° and then inserted into the opening area of ​​the device with the second butt edge facing the sleeve. It is also possible to use two opposing devices, one for covering the first butt edge and the other for covering the second butt edge.

[0010] In one embodiment, the inner punch is fixed in the axial direction. The relative axial movement between the inner punch and the hollow cylinder is then solely attributable to an absolute axial movement of the hollow cylinder. However, it is also possible that the inner punch moves when the hollow cylinder is axially fixed, or that both the hollow cylinder and the inner punch move.

[0011] A spring unit can be provided that generates an axial spring force between the hollow cylinder and the inner punch. In one embodiment, the spring unit is tensioned by inserting the sleeve into the opening area of ​​the hollow cylinder and by the relative axial movement between the inner punch and the hollow cylinder. After the protrusion has been folded over, pressed firmly against the inner surface of the sleeve wall, and the sleeve subsequently removed from the opening area, the device automatically returns to its initial position due to the tensioned spring unit, in which it can then accept a new sleeve for machining.

[0012] The spring unit can have several coil springs spaced apart around the circumference of the hollow cylinder. Each coil spring can be supported at one end by the inner piston and at the other end by the hollow cylinder. For example, three coil springs can be provided, each offset by 120° around the circumference of the hollow cylinder.

[0013] In one embodiment, a rotating element is provided so that the inner punch is rotated relative to the hollow cylinder when the relative axial movement between the hollow cylinder and the inner punch occurs. This relative rotation between the hollow cylinder and the inner punch also allows for a relative rotation between the inner punch and the inner surface of the sleeve wall. After the inwardly directed projection has been folded over towards the second buttress edge, the inner punch is not only axially inserted into the sleeve but is simultaneously rotated or drilled into it. This not only simplifies the axial insertion of the inner punch into the sleeve but also results in particularly intensive pressure of the folded-over projection against the inner surface of the sleeve wall.The twisting means thus allow a particularly strong connection to be achieved between the inner surface of the sleeve wall and the folded-over protrusion, if the protrusion and / or the inner surface of the sleeve wall have previously been coated with an adhesive.

[0014] The rotational means can comprise a cam and a pin guided within the cam. The cam can be associated with the inner punch, while the pin is associated with the hollow cylinder. Through the interaction of the cam and the pin guided within it, the relative axial movement between the inner punch and the hollow cylinder results in a simultaneous relative rotation between the inner punch and the hollow cylinder, or between the inner punch and the sleeve. It is also possible for the pin to be associated with the inner punch and the cam with the hollow cylinder.

[0015] The torsion elements can be an additional or alternative component of the spring unit. If the spring unit is tensioned during relative axial movement between the inner piston and the hollow cylinder, thereby generating a spring force, this spring force can act not only axially but also circumferentially. If the spring unit, as described above, has several coil springs, for example, an inclination of the coil spring axes can also generate a circumferential force between the inner piston and the hollow cylinder when the inner piston and hollow cylinder are moved axially relative to each other. Furthermore, regardless of the inclination described above, the coil springs can be designed to buckle laterally to a certain extent under compressive load, thereby also generating a circumferential force component between the inner piston and the hollow cylinder.

[0016] The inner punch can have a punch base with a recess contour, the recess contour serving to further deflect the protrusion already directed inwards through the opening area towards the second impact edge. The recess contour is preferably arranged rotationally symmetrically to a central axis of the inner punch.

[0017] A further object of the invention, namely the provision of a method for machining the cylindrical sleeve with the protrusion at at least the first butt edge, is achieved by the combination of features according to claim 7. An exemplary embodiment is described in the dependent claim to claim 7.

[0018] The inventive method for machining the cylindrical sleeve provides that the sleeve is inserted axially into the hollow cylinder with the first butt edge and the protrusion is deflected radially inwards through the opening area, wherein the inwards deflected protrusion is folded towards the second butt edge by an axial relative movement of the inner punch within the hollow cylinder and pressed against an inner surface of the sleeve wall.

[0019] The axial relative movement of the inner punch can be superimposed by a rotational movement of the inner punch relative to the sleeve. This rotational movement between the inner punch and the sleeve reliably presses the insertion of the inner punch into the sleeve and the folded-over protrusion against the inner surface of the sleeve wall, thus enabling a secure adhesive bond between the sleeve wall and the folded-over protrusion.

[0020] The invention will be explained in more detail with reference to the exemplary embodiments shown in the drawing. The drawing shows: Figure 1 shows a schematic section of a sleeve with unfolded protrusions; Figure 2 shows a sleeve with folded protrusions; Figure 3 shows a material section for covering a butt edge of the sleeve. Figure 1 Figure 4 schematically shows a device according to the invention for machining the sleeve with hollow cylinder and inner punch in an exploded view; Figure 5 the device of Figure 4 in two different positions of the hollow cylinder ( Figures 5A and 5B ); Figure 6 shows a cross-section along line VI-VI in Figure 5A ; and Figure 7 shows a further embodiment of the device according to the invention.

[0021] The Figures 1 and 2Figure 10 shows a sleeve, which is made of paper material and can be used as the cylindrical cartridge body of a cartridge. A foil pouch containing a viscous material such as silicone, acrylic, or adhesive can be arranged inside the cartridge body. The viscous material can be dispensed from the previously opened foil pouch or from the cartridge body using a standard cartridge gun.

[0022] The sleeve 10 has a first end-face butt edge 11 and a second end-face butt edge 12. A sleeve wall 13 made of cardboard extends between the first butt edge 11 and the second butt edge 12. In the area of ​​the first butt edge 11, a paper material section 20 abuts an outer surface 14 of the sleeve wall 13. In particular, the material section 20 abuts the outer surface 14 with a region 21, and an adhesive layer (not shown) is provided between region 21 and the outer surface 14. In addition to region 21, the material section 20 also has a projection 22, which is shown in the Figure 1 The shown condition extends beyond the first buttress edge 11. Figure 2Figure 1 shows the projection 22 in a folded-over state (final state), in which the projection 22 is fixed to an inner surface 15 of the sleeve wall 13 by an adhesive. In the area of ​​the second butt joint 12, a further material section 23 is provided, which is identical to the material section 20. Areas / components / details of the material section 23 that are identical to those of material section 20 are designated with the same reference numerals.

[0023] Figure 3 Figure 1 shows the material section 20 in its unwound form. The material section 20 is strip-shaped and has an overlap area 24 in which the two short ends of the material section 20 overlap when placed against the sleeve 10. Figure 3It is evident that the overhang consists of a first overhang area 22a and a second overhang area 22b. In the applied and folded-over state of the material section 20, the overhang area 22a covers the butt edge 11, while the overhang area 22b rests against the inner surface 15 of the sleeve wall 13.

[0024] The material sections 20 and 30 shown here are only narrow strips. It is also possible that only a single material section is provided, extending over the entire length of the sleeve 10 and thus projecting beyond the butt joints 11 and 12. Product information or the like may be printed on the material section.

[0025] Figure 4 shows a device 30 by which the overhang 22 can be folded over, i.e. from the one in Figure 1 the condition shown in the Figure 2The device 30 can be converted into the (final) state shown. It comprises a hollow cylinder 31 and an inner punch 32. The inner diameter 33 of the hollow cylinder 31 and the outer diameter 34 of the inner punch 32 are dimensioned such that the inner punch 32 can move into the hollow cylinder 31, leaving only a small gap (for example, less than 1 mm). The outer diameter of the inner punch can be 40 to 50 mm, preferably 43 to 47 mm. Figure 5 shows two different axial positions of the hollow cylinder 31. According to Figure 5B (left side) practically the entire inner die 32 is located inside the hollow cylinder 31

[0026] In Figure 5A portion of the sleeve 10 with the first buttress edge 11 and the material section 20 is also shown. The hollow cylinder 31 has a funnel-shaped opening region 35 into which the sleeve 10 with the first buttress edge 11 can be inserted axially along direction 36. The buttress edge 11 rests on the funnel-shaped opening region 35, whereby the projection 22 is deflected or bent radially inwards. If the hollow cylinder 31 is now moved further in direction 36, and thus the hollow cylinder 31 is shown in the illustration of the Figure 5 When pressed downwards, the inwardly directed projection 22 comes into contact with the inner punch 32. In particular, the projection 22 is folded by a circumferential outer edge 37 of the inner punch 32 towards the second impact edge 12 and pressed against the inner surface 15 of the sleeve wall 14. In the Figure 5BIn the position shown, the inner punch 32 projects into the sleeve 10 with its upper portion. The outer edge 37 of the inner punch and the inner surface 15 of the sleeve wall are opposite each other. The folded-over projection 22, or the second projection area 22b, is located between the outer edge 37 and the inner surface 15.

[0027] The inner punch 32 has a punch base 38 in which a recess contour 39 is formed. The recess contour 39 simplifies the deflection or folding of the projection 22.

[0028] As can be seen from the overall picture of the Figures 4 to 6As is clearly shown, three coil springs 40 are provided, which are supported on one side by the hollow cylinder 31 and on the other side by a base 41 that is firmly connected to the inner punch 32. When the hollow cylinder 31 is pressed down, the coil springs 30 are compressed. After the projection 22 has been folded over and pressed against the inner surface, and the sleeve 10 is removed from the opening area 35, the tensioned coil springs 30 ensure that the hollow cylinder 31 returns to its initial position. Figure 5A is moved. In this initial position, the device 30 is ready to deflect the protrusion of a new sleeve, fold it towards the other impact edge and press it against the inner surface of the sleeve.

[0029] Figure 7Figure 3 shows a further embodiment of the device 30 according to the invention. A groove or cam 43 is formed in a cylindrical surface 42 of the inner punch 32, which serves to receive an inwardly directed pin 44 in the hollow cylinder 31. When the hollow cylinder 31 is lowered, the inner punch 32 is slightly rotated due to the interaction of the pin 44 and the cam 43. This rotation simplifies the folding over of the projection 22 and increases the pressure of the folded over projection against the inner surface 15. To allow the inner punch 32 to rotate relative to the base 41, and thus also relative to the hollow cylinder 31 and the sleeve 10, a rotary bearing is provided between the inner punch 32 and the base 41. The rotary bearing is schematically indicated by balls 45 of a ball bearing (not shown in detail here).

[0030] But even in the exemplary embodiment of the Figures 4 to 6A certain relative rotation between the inner punch 32 and the hollow cylinder 31 can occur simply because the coil spring 40 can bend slightly to the side when the hollow cylinder 31 and the inner punch 32 are compressed together. Reference symbol list

[0031] 10 Sleeve 11 First butt edge 12 Second butt edge 13 Sleeve wall 14 Outer surface 15 Inner surface 20 Material section 21 Area 22 Overhang (22a, 22b) 23 Further material section 24 Overlap area 30 Device 31 Hollow cylinder 32 Inner punch 33 Inner diameter 34 Outer diameter 35 Opening area 36 Arrow (direction) 37 Outer edge 38 Punch base 39 Recess contour 40 Coil spring 41 Base 42 Shell surface 43 Groove / catch 44 Pin 45 Ball

Claims

1. Device (30) for machining a cylindrical sleeve Q, which has a first end-face butt edge (11), a second end-face butt edge (12) and a sleeve wall (13) extending between the first butt edge (11) and the second butt edge (12), wherein a material section (20) abuts an outer surface (14) of the sleeve wall (13) which has a projection (22) extending beyond the first butt edge (11), wherein the device (30) comprises a hollow cylinder (31) and an inner punch (32) which can be moved axially within the hollow cylinder (31), wherein the hollow cylinder (31) has a funnel-shaped opening region (35) for receiving the first butt edge (11), wherein the opening region (35) is designed to deflect the projection (22) radially inwards when the first butt edge (11) is axially inserted into the hollow cylinder (31), wherein the The inner stamp (32) has an outer edge (37) which is designed toto fold the inwardly directed projection (22) towards the second impact edge (12) and press it against an inner surface (16) of the sleeve wall Q when a relative axial movement takes place between the inner punch (32) and the hollow cylinder (31).

2. Device (30) according to claim 1, characterized by the fact that a spring unit is provided which generates an axial spring force between hollow cylinder (31) and inner punch (32).

3. Device (30) according to claim 2, characterized by the fact that The spring unit comprises several coil springs (40) which are arranged in the circumferential direction of the hollow cylinder (31).

4. Device (30) according to one of claims 1 to 3, characterized by the fact that Rotating means are provided so that the inner punch (32) is rotated relative to the hollow cylinder (31) when the relative axial movement between the hollow cylinder (31) and the inner punch (32) takes place.

5. Device (30) according to claim 6, characterized by the fact thatThe twisting means comprise a cam (43) and a pin (44) which is guided in the cam (43).

6. Device (30) according to any one of claims 1 to 7, characterized by the fact that the inner punch (32) has a punch base (38) with a recess contour (39), the recess contour (39) serving to further deflect the inwardly directed protrusion (22).

7. Method for machining a cylindrical sleeve (10) having a first end-face butt edge (11), a second end-face butt edge (12) and a sleeve wall (13) extending between the first butt edge (11) and the second butt edge (12), wherein a material section (20) rests on an outer surface (14) of the sleeve wall (13) and has a projection (22) extending beyond at least the first butt edge Q, wherein the device (30) comprises a hollow cylinder (31) and an inner punch (32) which can be moved axially within the hollow cylinder (31), wherein the hollow cylinder (31) has a funnel-shaped opening region (35) for receiving the first butt edge (11), wherein the sleeve (10) is inserted axially into the hollow cylinder (31) with the first butt edge (11) and the projection (22) is deflected radially inwards through the opening region (35),wherein the inwardly directed projection (22) is folded by an axial relative movement of the inner punch (32) within the hollow cylinder (31) in the direction of the second impact edge (12) and pressed against an inner surface (15) of the sleeve wall (13).

8. Method according to claim 7, characterized by the fact that the axial relative movement of the inner punch (31) is superimposed by a rotational movement of the inner punch (31) relative to the sleeve (10).

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