Hot-stamping roller

Abstract

Hot stamping roller, the roller being adapted to cooperate with an object to be decorated, the roller comprising at least a first and a second roller part, each roller part being configured to rotate around a longitudinal axis of the roller, the rotation of the first roller part being independent of the rotation of the second roller part.

Description

Technical field of the invention

[0001] The invention relates to a hot stamping roller. In particular, the invention relates to a hot stamping roller intended for decorating an object having a variable diameter along its length. Technical background

[0002] Hot stamping using silicone or metal rollers is a well-known technique for decorating objects, for example by embossing and / or transferring a design or inks onto a surface. Typical applications of hot stamping include packaging, in the cosmetics industry for example, or marking glass items such as bottles and other glass products.

[0003] Hot stamping rollers can consist of a core and a silicone surface wrapped around and attached to the core. The core itself can be made of metal, for example. The hot stamping roller is typically rotated around an axis extending lengthwise along the roller and through the center of the core.

[0004] During the hot stamping process, the silicone roller's surface is initially heated by a heat source, such as an infrared tile or other heat source, before being moved toward the object to be decorated. Typically, a film of transfer material is spread between the silicone roller and the object. For example, the film is brought into contact with the object by applicator guides. Then, the heat and pressure applied by the silicone roller to the film and the object beneath it transfer some of the material from the film onto the object.

[0005] When the object to be decorated is conical or, if the object has different diameters along its length, for example in a process of decorating a conical glass object, since the axis of rotation of the object has the same speed of rotation along its length, the tangential speed to the surface of the object is not the same if the object is not cylindrical.

[0006] When the object to be decorated is conical or, if the object has different diameters along its length, for example, with a small base of radius r1 and a large base of radius r2, the tangential velocity Vr2 is greater than Vr1.

[0007] Consequently, when the cylindrical hot stamping roller is rotated around its axis, upon contact with the object, slippage occurs between the object and the roller, creating creases in the film. The hot stamping process can tolerate a small difference in tangential speed (on the order of a few percent). Beyond this, the film creases can cause problems in the transfer process.

[0008] Reference will be made, for example, to documents US2008 / 216678, IT201800009548 and US2011 / 179960.

[0009] The object of the present invention is to mitigate the disadvantages described above. Summary of the invention

[0010] The invention provides a hot stamping roller, the roller being adapted to cooperate with an object to be decorated, the roller comprising at least a first and a second roller part, each roller part being configured to rotate about a longitudinal axis of the roller, the rotation of the first roller part being independent of the rotation of the second roller part.

[0011] In some embodiments, the object to be decorated is designed to rotate. In other embodiments, a specific marking method uses a longitudinal axis that describes a horizontal movement (for example, a rolling motion) relative to the object to be decorated. It can, for example, roll over a flat or convex surface of the object. Thus, the hot stamping roller according to the present invention can also be used to decorate two separate sections of the object.

[0012] In some embodiments, at least one of the first and second parts of the roller is cylindrical, conical, concave, or convex. In some embodiments, the first and second parts of the roller have different shapes. In some embodiments, the first and second parts of the roller have identical or similar shapes. In some embodiments, each of the first and second parts of the roller is cylindrical, conical, concave, or convex.

[0013] In some embodiments, the first and second parts of the roller are cylindrical and have different diameters. Thus, a cross-section of the first part of the roller differs from a cross-section of the second part. It is preferable that the diameter of each part of the roller be chosen so as to ensure that the tangential velocities of the roller surfaces at the points of contact with the surface of the object to be decorated are substantially the same along the entire length of the relevant cross-section of the object to be decorated.

[0014] In some embodiments, the roller parts each include a support core.

[0015] Advantageously, the support core comprises a cylindrical body having a central bore.

[0016] The support core of each roller section includes a longitudinal axis around which the roller section rotates when in motion. The longitudinal axis of each support core corresponds to the longitudinal axis of the roller. More precisely, the longitudinal axis of the roller is the central longitudinal axis of each support core.

[0017] In some embodiments, each part of the roller comprises a support core and a surface part.

[0018] In some embodiments, the surface part is formed as a single piece with the supporting core.

[0019] In some embodiments, the surface portion is bonded, joined, or otherwise fixed to the support core.

[0020] In some embodiments, the roller includes an axle. Advantageously, in these embodiments, the first and second parts of the roller are mounted on the axle. More precisely, the axle is received by the first and second parts of the roller through their respective central bores. In such embodiments, the longitudinal axis of the roller and the axle is the same longitudinal axis.

[0021] In some embodiments, the first and / or second roller section includes a plain bearing. The plain bearing allows rotational movement between the roller section(s) and the roller's longitudinal axis. In some embodiments, the roller includes an axle, and the first and / or second roller section includes a plain bearing; the bearing allows rotational movement between the roller section(s) and the axle.

[0022] In some embodiments, at least the second roller part includes at least one plain bearing, for example allowing the second roller part to rotate freely around the longitudinal axis of the roller.

[0023] In some embodiments, the first and / or second roller section comprises a ball bearing or roller bearing. In some embodiments, the first and / or second roller section comprises any other system that allows each roller section to operate at an independent speed.

[0024] The ball bearing or roller bearing allows rotational movement between the roller section(s) and the roller's longitudinal axis. In some embodiments, the roller includes an axis, and the first and / or second roller section includes a ball bearing or roller bearing; the bearing or bearing allows rotational movement between the roller section(s) and the axis.

[0025] In some embodiments, at least the second roller part includes at least one ball bearing or roller bearing, for example allowing the second roller part to rotate freely around the longitudinal axis of the roller.

[0026] In some embodiments, each of the first and second parts of the roller includes at least one ball bearing or roller bearing, for example to enable it to rotate independently of the other part of the roller.

[0027] In some embodiments, the first and / or second roller section fits onto the roller shaft, allowing relative movement between the first and / or second roller section and the shaft, independently of each other. In such embodiments, it is preferable for the first roller section, the second roller section, the plain bearing, and the shaft to be coaxial with each other.

[0028] In some embodiments, the first part of the roller can be fixed relative to the axis. More precisely, the first part of the roller and the axis rotate together.

[0029] In some embodiments, the roller comprises a first roller section that rotates with the longitudinal axis of the roller and a second roller section that rotates freely about the longitudinal axis of the roller by means of a plain bearing. Advantageously, the plain bearing is located between the support core of the second roller section and the axis. In this way, the second roller section is free to rotate about the axis.

[0030] In some embodiments, the rotational speed of the first roller section is equal to the rotational speed of the longitudinal axis. In these embodiments, the rotational speed of the second roller section is independent of the rotational speed of the first roller section and the longitudinal axis. In this way, the rotational speed of the second roller section can be substantially equal to the rotational speed of the adjacent part of the object being decorated.

[0031] In certain embodiments, when the longitudinal axis is not in contact with the object to be decorated, due to friction between the roller sections and / or with the longitudinal axis, the free-rotating part(s) can synchronize with the speed of the longitudinal axis. This advantageously allows the free-rotating part(s) to be driven (by friction) during a heating phase, for example.

[0032] In some embodiments, the roller is a multi-part roller comprising more than two roller parts.

[0033] In some embodiments, a first roller section rotates with the roller's longitudinal axis, and two or more roller sections are configured to rotate freely about the roller's longitudinal axis. In these embodiments, the two or more roller sections rotate independently of the first roller section. In such embodiments, the two or more roller sections can rotate independently of each other. In some embodiments, each roller section is configured to rotate freely about the roller's longitudinal axis. More precisely, each roller section can be configured to rotate independently of any other roller section.

[0034] In some embodiments, each roller part comprises a support core and a surface part.

[0035] In some embodiments, each part of the roller, in contact with the object to be decorated, is adaptable to the tangential speed of the object to be decorated at the point of contact between the object to be decorated and the section or sections of the roller part.

[0036] In some embodiments, at least one of the first and second parts of the roller is cylindrical. In some embodiments, each of the first and second parts of the roller is cylindrical. In other embodiments, at least one of the first and second parts of the roller is conical. In some embodiments, each of the first and second parts of the roller is conical.

[0037] In some embodiments, the first and second parts of the roller are cylindrical and the first part of the roller has a different diameter than the second part of the roller.

[0038] In some embodiments, each section of the roll has a different diameter. This arrangement is particularly suitable for decorating a conical object, for example.

[0039] In some embodiments, the roller parts are butted against each other along the roller axis.

[0040] In some embodiments, the roller sections are spaced longitudinally from one another along the roller's longitudinal axis. More specifically, the roller may include spacers between the roller sections.

[0041] In some embodiments, each roller part includes a silicone surface part.

[0042] In some embodiments, each roller part comprises a support core and a silicone layer covering the support core.

[0043] In some embodiments, the support core is metallic.

[0044] In some embodiments, at least the second part of the roller is free to adapt its rotation speed to the tangential speed of the object to be decorated at the point of contact between them.

[0045] In some embodiments, the roller is driven in rotation.

[0046] In some embodiments, the roller is driven in rotation by a drive shaft extending along the longitudinal axis of the roller. In some embodiments, the drive shaft may be driven by a motor.

[0047] In some embodiments, the roller axis forms the drive axis and is driven in rotation.

[0048] In some embodiments, the object to be decorated is rotated. More precisely, the object to be decorated is rotated by a drive device such as a motor. In these embodiments, the roller can be rotated by friction between the object to be decorated, which is rotated by a drive device such as a motor, and the roller.

[0049] The invention also proposes a hot stamping machine comprising a roller according to the present invention.

[0050] The invention also proposes a hot stamping machine comprising a hot stamping roller, the roller being adapted to cooperate with an object to be decorated, the roller comprising at least a first and a second roller part, each roller part being configured to rotate around a longitudinal axis of the roller, the rotation of the first roller part being independent of the rotation of the second roller part.

[0051] In some embodiments, the hot stamping machine further includes a device for driving the rotation of at least the first part of the roller or the second part of the roller.

[0052] In some embodiments, the hot stamping machine further includes a device for driving the rotation of the object to be decorated.

[0053] In some embodiments, the hot foil stamping machine includes a first and a second film feed system. In some embodiments, each film feed system includes at least one feed roller and one rewind roller. In this way, each film feed system can be used to wind the film between the feed roller and the rewind roller. The roll and the object to be decorated are positioned between the feed roller and the rewind roller so that the film passes between the roller and the object to be decorated during the operation of the film feed system.

[0054] In this way, the film passing over each section of the roll is independent of any film passing over another section. Multiple film feeding systems, each feeding only one section of the roll, prevent film wrinkling.

[0055] In some embodiments, the hot stamping machine includes a heat source that can be used to increase the temperature of the roller surface. It is preferable that the surface of each roller section be continuously rotated to prevent overheating of any part of the roller surface.

[0056] In some embodiments, the heat source can be an infrared heat source.

[0057] In some embodiments, the hot stamping machine includes a heat sensor that can be used to monitor the surface temperature of the roller part(s).

[0058] The hot stamping machine and roller according to the invention are applicable in glass decoration, for example. Other applications include, but are not limited to, decorating plastic and metal objects.

[0059] To avoid any doubt, all the characteristics described herein also apply to every aspect of the invention.

[0060] Within the scope of this application, it is expressly provided that the various aspects, embodiments, examples, and alternatives set forth in the preceding paragraphs, in the claims, and / or in the following description and drawings, and in particular their individual features, may be considered independently or in any combination. In other words, all embodiments and / or features of any embodiment may be combined in any manner, unless such features are incompatible.

[0061] To avoid ambiguity, the terms "may," "and / or," "for example," and any similar terms used in this document shall be interpreted as non-limiting, such that not every feature so described is necessarily present. Indeed, any combination of optional features is expressly envisaged without departing from the scope of the invention, whether or not they are expressly claimed. The applicant reserves the right to amend any originally filed claim or to file any new claim accordingly, including the right to amend any originally filed claim to depend on and / or incorporate any feature of any other claim, even if it was not originally claimed in that manner. Brief description of the figures

[0062] Other features and advantages of the invention will become apparent upon reading the detailed description that follows, for an understanding of which reference should be made to the attached drawings in which: [ Fig. 1 ] there figure 1 shows a schematic view of part of a hot stamping machine according to an example of the invention; [ Fig. 2 ] there figure 2 shows a cross-sectional view of a roller having two freely rotating roller parts; Fig. 3 ] there figure 3 shows the scroll of the figure 2 in perspective view; Fig. 4 ] there figure 4 shows a hot stamping roller and a cylindrical, shouldered object to be decorated; and [ Fig. 5 ] there figure 5 shows the first and second parts of the scroll in another embodiment; [ Fig. 6 ] there figure 6 shows a cross-sectional view of another roller having two freely rotating roller sections; Fig. 7 ] there figure 7 shows the scroll of the figure 6 in perspective view; Fig. 8 ] there figure 8 shows several different hot stamping rollers, each with a shouldered cylindrical object to be decorated; and [ Fig. 9 ] there figure 9 shows the scrolls and objects of the figure 8 in perspective view. Detailed description of the figures

[0063] Various aspects of different embodiments according to the invention are described in more detail below, with reference to figures 1 to 5 attached.

[0064] In all drawings, similar features are represented by the same reference number. In other embodiments, the reference numbers of similar features are increased by a factor of 10. Unless otherwise specified, features of one embodiment may be used in any other embodiment.

[0065] There figure 1This shows a schematic view of part of a hot foil stamping machine 1. The machine includes a decorating object 15 and a hot foil stamping roller 2. The hot foil stamping roller 2 comprises a metal support core 9 and a silicone surface 11 attached to the metal support core 9. The metal support core 9 has a central bore and is mounted via the central bore onto a roller shaft 10. The longitudinal axis 7 of the hot foil stamping roller 2 extends into the page perpendicular to the plane of the page. A heating device 17 extends over part of the silicone surface 11 to increase the temperature of the surface 11. A film feeding system includes a feed roller 19 and a rewind roller 21, configured to distribute the film 23 between themselves and between the hot foil stamping roller 2 and the object 15.

[0066] During operation, the object 15 and / or the roller shaft 10 are driven into rotation. The roller 2 rotates around the longitudinal axis 7 such that the heated silicone surface 11 is brought into contact with the film 23 and a portion of the film 23 is transferred onto the object under the effect of the pressure and temperature applied to the film 23 between the roller 2 and the object 15.

[0067] There figure 2 shows a cross-sectional view of an embodiment of a hot stamping roller 2A having two rotating roller parts 3A, 5A. Each roller part 3A, 5A has a silicone surface part 11A supported by and fixed to a roller support core 9A.

[0068] Roller 2A includes an axle 10A. The first and second roller sections 3A, 5A are mounted on the axle 10A by passing the axle 10A through the central bore of each roller section 3A, 5A. The first and second roller sections 3A, 5A are held in place on the axle 10A by nuts 25 and spaced apart by spacers 27. Other end spacers 27a and 27b are located between the nuts 25 and the adjacent roller section 3A, 5A respectively.

[0069] The first roller part 3A and the second roller part 5A include a central bore to receive the axle 10A. In such embodiments, the longitudinal axis of the roller and the longitudinal axis of the axle are the same axis 7A.

[0070] Plain bearings 13A, located between the support core of each roller section 3A, 5A and the axle 10A, ensure that each roller section is free to rotate about the longitudinal axis 7A of the roller. The rotation of each roller section 3A, 5A about the axis 7A is independent of the rotation of the other roller sections 3A, 5A.

[0071] The axis of axle 10A is driven in rotation around the axis 7A in the direction of arrow A by a motor (not shown).

[0072] There figure 3 represents roll 2A of the figure 2 in perspective view. The first part of roller 3A and the second part of roller 5A are spaced apart from each other along the longitudinal axis 7A and the axle 10A of roller 2A.

[0073] In the alternative embodiment shown in the figure 4For example, the cylindrical object 15B has different diameters along its length. In this embodiment, the first roller section 3B and the second roller section 5B have different diameters. The first roller section 3B has a smaller diameter than the second roller section 5B to correspond to the T-shaped cylindrical object 15B, which has a first section with a larger diameter and a second section with a smaller diameter. Object 15B has a shoulder section with a larger diameter than the body section extending longitudinally from the shoulder of object 15B. The first roller section 3B is configured to rotate about axis 7B, while the second roller section 5B is configured to rotate freely about axis 7B.In this way, the rotational speeds of the first and second roller parts 3B, 5B can vary to adapt to the speed of the portion of object 15B in contact with the respective roller part 3B, 5B.

[0074] There figure 5 shows the first and second parts of the roll of the 2B silicone hot stamping roller shown on the figure 4 The roller sections 3B and 5B have different diameters, and a third roller section 250B, with a conical shape, is positioned between the first and second roller sections 3B and 5B. This third roller section 250B provides a conical surface between the first roller section 3B and the second roller section 5B. The third roller section 250B is free to rotate about axis 7B independently of the first 3B and second 5B roller sections.

[0075] There figure 6shows a cross-sectional view of another embodiment of a hot stamping roller 2C having two rotating roller parts 3C, 5C. Each roller part 3C, 5C has a silicone surface part 11C supported by and fixed to a roller support core 9C.

[0076] The roller 2C comprises an axle 10C. The first and second roller sections 3C, 5C are mounted on the axle 10C by passing the axle 10C through the central bore of each roller section 3C, 5C. Each of the first and second roller sections 3C, 5C is rotatably mounted on the axle 10C and spaced apart by roller bearings 13C. The first and second roller sections 3C, 5C are also held in place on the axle 10C by nuts 25C.

[0077] The first roller part 3B and the second roller part 5B include a central bore to receive the axle 10B. In such embodiments, the longitudinal axis of the roller and the longitudinal axis of the axle are the same axis 7B.

[0078] The roller bearings 13C are located between the support core 9C of each roller section 3C, 5C and the axle 10C, ensuring that each roller section is free to rotate about the longitudinal axis 7C of the roller. The rotation of each roller section 3C, 5C about the axis 7C is independent of the rotation of the other roller sections 3C, 5C.

[0079] There figure 7 represents roll 2C of the figure 6 in perspective view. The first part of roller 3C and the second part of roller 5C are spaced apart from each other along the longitudinal axis 7C and the axle 10C of roller 2C.

[0080] There figure 8shows several different hot stamping rollers 2D, 2E, 2F, 2G, 2H, 2I, 2J, 2K, 2L, 2M, each with a shouldered cylindrical object to be decorated 15D, 15E, 15F, 15G, 15H, 15I, 15J, 15K, 15L, 15M.

[0081] A first 2D roller comprises a pair of 3D and 5D conical roller sections, each with a different diameter, to cooperate with correspondingly shaped portions of a first 15D object. A second 2E roller comprises a 3E conical roller section and a 5E cylindrical roller section to cooperate with correspondingly shaped portions of a second 15E object. A third 2F roller comprises two 3F and 5F roller sections, each with a different diameter, to cooperate with correspondingly shaped portions of a third 15F object. A fourth 2G roller comprises a pair of 3G and 5G concave roller sections to cooperate with convex portions of a fourth 15G object. A fifth 2H roller comprises a 3H conical section and a 5H concave section to cooperate with correspondingly shaped conical and convex portions of a fifth 15H object.

[0082] A sixth roller 2I comprises a cylindrical portion 3I and a concave portion 5I to cooperate with corresponding cylindrical and convex portions of a sixth object 15I. A seventh roller 2J comprises a concave roller portion 3J and a convex roller portion 5J to cooperate with corresponding convex and concave portions of a seventh object 15J. An eighth roller 2K comprises a pair of convex roller portions 3K and 5K to cooperate with concave portions of an eighth object 15K. A ninth roller 2L comprises a conical portion 3L and a convex portion 5L to cooperate with corresponding conical and concave portions of a ninth object 15L. A tenth roller 2M comprises a cylindrical portion 3M and a convex portion 5M to cooperate with corresponding cylindrical and concave portions of a tenth object 15M.

[0083] There figure 9shows the 2D, 2E, 2F, 2G, 2H, 2I, 2J, 2K, 2L, 2M rolls and the 15D, 15E, 15F, 15G, 15H, 15I, 15J, 15K, 15L, 15M objects of the figure 8 in perspective view.

[0084] In another alternative embodiment, a hot stamping roller can be provided for decorating a conical object. In such an embodiment, a silicone hot stamping roller for conical objects comprises a first roller section and a second roller section having different diameters. The first and second roller sections each have a common longitudinal axis. The first roller section rotates with the longitudinal axis, and the second roller section rotates freely about the longitudinal axis by means of a plain bearing.

[0085] A person skilled in the art will appreciate that several variations of the aforementioned embodiments are conceivable without departing from the scope of the invention.

[0086] Throughout the description and claims of this specification, the words "include" and "contain" and their variations mean "including but not limited to", and are not intended to include (and do not exclude) other parts, additives, components, wholes, or steps.

[0087] The features, integers, characteristics, compounds, or groups described in connection with a particular aspect, embodiment, or example of the invention shall be understood as applicable to any other aspect, embodiment, or example described in this document, except where inconsistent. All features disclosed in this specification (including the claims, abstract, and accompanying drawings), and / or all steps of a method or process so disclosed, may be combined in any combination, except for combinations where at least some of these features and / or steps are mutually exclusive. The invention is not limited to the details of all the preceding embodiments.

[0088] The invention extends to any new feature, or any new combination, of the features disclosed in this specification (including the claims, abstract, and accompanying drawings), or to any new feature, or any new combination, of the steps of any method or process so disclosed. List of reference signs

[0089] 1 Hot stamping machine 2 Roller 2A Roller 2B Roller 2C Roller 2DR Roller 2ER Roller 2FR Roller 2G Roller 2HR Roller 2IR Roller 2J Roller 2K Roller 2LR Roller 2MR Roller 3A First part of the roller 3B First part of the roller 3C First part of the roller 3D First part of the roller 3E First part of the roller 3F First part of the roller 3G First part of the roller 3H First part of the roller 3I First part of the roller 3J First part of the roller 3K First part of the roller 3L First part of the roller 3M First part of the roller 5A Second part of the roller 5B Second part of the roller 5C Second part of the roller 5D Second part of the roller 5E Second part of the roller 5F Second part of the roller 5G Second part of the roller 5H Second part of the roller 5I Second part of the roller 5J Second part of the roller 5K Second part of the roller 5L Second part of the roller 5M Second part of the roller 7A Longitudinal axis of the roller 7AA Longitudinal axis of the roller 7BA Longitudinal axis7C Longitudinal axis of the roller 9A Support axis of the roller part 9AA Support axis of the roller part 9CA Support axis of the roller part 10 Axle 10AE Axle 10CE Axle 11 Surface silicone part 11A Surface silicone part 11C Surface silicone part 13A Sliding bearings 13C Roller bearings 15 Object to be decorated 15BO Object to be decorated 15DO Object to be decorated 15EO Object to be decorated 15FO Object to be decorated 15GO Object to be decorated 15HO Object to be decorated 15IO Object to be decorated 15JO Object to be decorated 15KO Object to be decorated 15LO Object to be decorated 15MO Object to be decorated 16 Object rotation axis 17 Heating device 19 Feed roller 21 Rewind roller 23 Film 25 Nut 27 Spacer 27a End spacers 27b End spacers

Claims

1. A hot stamping roller (2, 2A...2M), the roller being designed to engage with an object to be decorated (15, 15B, 15D...15M), the roller comprising at least a first roller part and a second roller part (3A...3M, 5A...5M), each roller part being configured to rotate around a longitudinal axis (7, 7A, 7B, 7C) of the roller, the rotation of the first roller part (3A....3M) being independent of the rotation of the second roller part (5A....5M).

2. The hot stamping roller according to claim 1, in which at least one of the first and second roller parts (3A...3M, 5A...5M) is cylindrical, conical, concave or convex.

3. The hot stamping roller according to claim 2, in which the first and second roller parts have different shapes.

4. The hot stamping roller according to any one of the preceding claims, in which the first and second roller parts have different diameters.

5. The hot stamping roller according to any one of the preceding claims, in which the roller comprises a carrier core (9, 9A, 9C).

6. The hot stamping roller according to any one of the preceding claims, in which each roller part comprises a carrier core (9A, 9C) and a surface part (11A, 11C).

7. The hot stamping roller according to claim 6, in which the surface part (11A, 11C) of at least the first roller part (3A, 3C) is made in one piece with the carrier core (9A, 9C) of the roller.

8. The hot stamping roller according to any one of the preceding claims, further comprising an axle (10A, 10C), in which the first and second roller parts (3A, 3C, 5A, 5C) are mounted on the axle.

9. The hot stamping roller according to any one of the preceding claims, in which at least the second roller part (5A) comprises a plain bearing (13A) enabling the second roller part to rotate freely around the roller's longitudinal axis (7A).

10. The hot stamping roller according to claim 9, in which the first and second roller parts (3A, 5A) comprise a plain bearing (13A) enabling the first and second roller parts to rotate freely around the roller's longitudinal axis (7A) independently of each other.

11. The hot stamping roller according to any one of claims 1 to 8, in which at least the second roller part (5C) comprises at least one roller bearing (13C) enabling the second roller part to rotate freely around the roller's longitudinal axis (7C).

12. The hot stamping roller according to claim 11, in which each of the first and second roller parts (3C, 5C) comprises at least one roller bearing (13C) to enable it to rotate independently relative to the other roller part.

13. The hot stamping roller according to claim 9 or claim 11, comprising a first roller part that rotates with the longitudinal axis of the roller and the second roller part that rotates freely relative to the longitudinal axis of the roller.

14. A hot stamping machine (1) comprising a hot stamping roller (2, 2A...2M), the roller being designed to engage with an object to be decorated (15, 15B, 15D...15M), the roller comprising at least a first roller part and a second roller part (3A...3M, 5A...5M), each roller part being configured to rotate around a longitudinal axis (7, 7A, 7B, 7C) of the roller, the rotation of the first roller part being independent of the rotation of the second roller part.

15. The hot stamping machine according to claim 14, comprising first and second film feed systems (19, 21).

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