阅读说明：本技术 用于展开带材的装置及印压元件成片材形式的机器 (Device for unwinding a web and machine for embossing elements in sheet form ) 是由 C·德加兰德 B·杰凯特 于 2019-09-06 设计创作，主要内容包括：本发明涉及用于印压机(1)用于展开带材的装置(10),其允许待印压的该带材(2)以预展开状积累于该印压机(1)的至少一印压卷轴(3)和板压机(310)之间,其特征在于,该用于展开带材的装置(10)包括：-中央鼓(11),其被配置成以可变的前进速度被引导旋转,与该用于展开带材的装置(10)的轴联合旋转,-卫星式滚轮(14),其带有轴(11),该轴被构造成平行于该中央鼓(11)的该轴,其中该卫星式滚轮(14)可绕该中央鼓(11)转动,及该预展开的带材可由于该卫星式滚轮(14)的移动而绕该中央鼓(11)缠绕,及-行星式引导装置(15),其根据该中央鼓(11)的旋转速度和该行星式引导装置(15)的外环(13)该旋转速度之间的差移动该卫星式滚轮(14)绕该中央鼓(11),该外环(13)被配置成与该中央鼓(11)的旋转方向相反的旋转方向以恒定速度被引导旋转。本发明还包括印压机(1),其配置为在每张片材上放置由至少一条待印压的带材(2)制成的镀金或金属膜。(The invention relates to a device (10) for unwinding a strip for a platen press (1) which allows the strip (2) to be pressed to be accumulated in pre-unwound form between at least one pressing reel (3) of the platen press (1) and a platen press (310), characterized in that the device (10) for unwinding the strip comprises: -a central drum (11) configured to be guided in rotation at a variable advancement speed, rotating in conjunction with the shaft of the device (10) for unwinding the strip, -satellite wheels (14), with a shaft (11) configured parallel to the axis of the central drum (11), wherein the satellite wheels (14) are rotatable around the central drum (11) and the pre-unwound strip is wound around the central drum (11) as a result of the movement of the satellite wheels (14), and-planetary guide means (15), which moves the satellite wheels (14) around the central drum (11) according to the difference between the rotational speed of the central drum (11) and the rotational speed of the outer ring (13) of the planetary guide (15), the outer ring (13) is configured to be guided in rotation at a constant speed in a direction of rotation opposite to the direction of rotation of the central drum (11). The invention also comprises a platen press (1) configured to place on each sheet a gold-plated or metallic film made of at least one strip (2) to be pressed.)

1. Device (10) for unrolling a strip for a platen press (1) allowing the strip (2) to be embossed to be accumulated in pre-unrolled form between at least one embossing reel (3) of the platen press (1) and a platen press (310), characterized in that the device (10) for unrolling a strip comprises:

-a central drum (11) configured to be guided in rotation at a variable advancement speed, in rotational connection with a shaft (16) of the device (10) for unwinding the strip,

-a satellite wheel (14) with an axis (21), the axis (21) being configured parallel to the axis (16) of the central drum (11), wherein the satellite wheel (14) is rotatable around the central drum (11), and the pre-unwound band is windable around the central drum (11) due to the movement of the satellite wheel (14), and

-a planetary guide device (15) moving the satellite wheel (14) around the central drum (11) according to the difference between the rotational speed of the central drum (11) and the rotational speed of the outer ring (13) of the planetary guide device (15), configured to be guided in rotation at a constant speed in a direction of rotation opposite to the direction of rotation of the central drum (11).

2. Device (10) for unrolling a strip according to the preceding claim, characterised in that the planetary guide means (15) comprise:

-a central gear (12), the central gear (12) rotating around the central drum (11) and being coaxial with the central drum (11) when the central gear (12) is coaxial with the outer strip (13),

-a satellite gate (17) moving around the central drum (11) and coaxial with the central drum (11) in association with the satellite roller (14), and

-at least one satellite gear (20) mounted on the satellite door (17), engaged with the outer ring (13) and the central gear (12), guided in rotation around the central drum (11) in one direction or the other, according to the difference in the rotation speed of the central drum (11) and the outer ring (13).

3. Device (10) for unrolling a strip according to the preceding claim, characterised in that the original radius of the central gear wheel (12) corresponds to the outer radius of the central drum (11).

4. Device (10) for unrolling a strip according to any one of the preceding claims, characterised in that the diameter of the satellite rollers (14) is of a smaller size than the radial space between the original diameter of the outer ring (13) and the outer diameter of the central drum (11).

5. Device (10) for unrolling a strip according to any one of the preceding claims, characterised in that the satellite wheels (14) rotate.

6. Device (10) for unrolling a strip according to the preceding claim, characterized in that the planetary guide means (15) also comprise a serrated wheel (18) mounted on the satellite gate (17), moving in conjunction with the satellite wheel (14) and engaging with the outer ring (13).

7. Device (10) for unrolling a strip according to the preceding claim, characterised in that the original radius of the serrated wheel (18) corresponds to the outer radius of the satellite rollers (14).

8. Device for unrolling a strip according to any one of claims 1-4, characterised in that the satellite wheels (14) are fixed to the satellite gates (17) of the planetary guide (15) and that the satellite wheels (14) are perforated with internal cavities arranged to communicate with pressurised air so as to form an air cushion under the strip (2) to be embossed.

9. Device (10) for unrolling a strip according to any one of the preceding claims, characterised in that the planetary guide (15) comprises a guide track (22; 33), which guide track (22; 33) moves around the central drum (11) in conjunction with the satellite rollers (14), which guide track (22; 33) is apt to be inserted between the two strands of pre-unrolled strip to guide the outer strands of said strip.

10. Device (10) for unrolling a strip according to the preceding claim, characterised in that the guide (22) comprises one to ten, for example five, additional satellite wheels (23), one or more of the additional satellite wheels (23) and the satellite wheels (14) being in the shape of a circle (C).

11. Device (10) for unrolling a strip according to the preceding claim, characterised in that one or more of the additional satellite wheels (23) rotate.

12. Device (10) for unwinding a strip according to the preceding claim, characterized in that the track (22) also comprises as many additional satellite wheels (23) as serrated wheels (24), the serrated wheels (24) being mounted on the satellite doors (17) and rotating and engaging the outer ring (13) in association with the respective additional satellite wheels (23).

13. Device (10) for unrolling a strip according to claim 9, characterised in that the guide (33) comprises a metal element fixed to the satellite port (17) with between one and ten, for example five folds or bends (30), one or more of the folds or bends (30) and the satellite wheel (14) being in the shape of a circle (C).

14. Device (10) for unrolling a strip according to any one of claims 10-13, characterised in that the diameter of the circle (C) corresponds to the original diameter of the outer ring (13).

15. Device (10) for unwinding a strip according to any one of the preceding claims, characterized in that the outer ring (13) is configured to be guided in rotation at a constant speed substantially equal to the average of the variable advancing speed.

16. Device (10) for unwinding a strip according to any one of the preceding claims, characterized in that the shaft (16) of the central drum (11) can be guided in rotation to variable advancement speeds by means of an electric motor (25) of the device (10) for unwinding a strip to form a guiding shaft.

17. Platen press (1) of sheet-type elements configured to place on each sheet a gold-plated or metallic film made of at least one strip (2) to be pressed, characterized in that it further comprises at least one device (10) for unrolling a strip according to one of the preceding claims.

Technical Field

The invention comprises a device for unwinding a web for a machine for embossing elements in sheet form. The invention also comprises a platen press configured to place on each sheet a gold-plated or metallic film made of at least one strip to be stamped.

Background

It is known how to print text and/or patterns by means of embossing, that is to say a sheet of coloured or metallic film (called metallic tape) produced by one or several strips to be embossed, exerting pressure on a support. In industry, such transfer operations are traditionally performed by means of a plate press, in which the supports for printing are introduced one after the other, while each strip to be printed is brought in a continuous manner.

Each web to be imprinted is wound in the form of a reel, mounted on the machine in a rotary movement and unwound by directly pulling it using an advancing shaft. In fact, the advancement shaft is designed to rotate at variable speeds, considering that the advancement of the strip runs in a sequential manner inside the plate press. However, compliance with such constant acceleration, deceleration and standstill can become particularly difficult due to the relatively large inertia of the reel due to its heavy weight.

In order to solve this difficulty, it is conceivable to separate the rotation of the reel from the rotation of the advancing shaft, so that a reserve of strip is formed between the two rotators. For this purpose, a system for unwinding the strip is generally used which is capable of simultaneously accumulating the strip in pre-unwound form downstream of the reel and supplying a pre-unwound strip of suitable length for each request from the advancing reel. The presence of such a reserve of strip in the insertion position advantageously allows the reel to unwind at a substantially constant speed, while allowing the advancing shaft to operate at a variable speed.

In this respect, from document WO2012/116781 a system for unwinding a strip material between a reel and a forward shaft is known, which system moves two sets of gears, wherein the distance of the two sets of gears may vary according to the advancement of the strip material. In particular, the two sets of gears are positioned in such a way as to define a flow path for the strip, wherein the form describes a series of rings that pass over each gear, respectively, to be alternately transferred from one set of gears to the other. One set of gears is movably mounted for movement toward each other between a position adjacent to each other and a position spaced apart from each other, wherein in the position adjacent to each other the two sets of gears are arranged alongside each other to define a flow path of minimum length of the strip; at one location spaced from each other, the two sets of gears are spaced apart by a distance to define a flow path of maximum length of the strip.

However, due to the inertia of the reel, such unwinding systems of the strip may be intermittent, in particular during the transitional phases of acceleration and deceleration, starting and stopping. These interruptions may stretch the web to be stamped and damage it. Reel brakes are often necessary to ensure optimal tension of the strip material and not unwind more reels than is necessary when the forward feed is slowed and stopped. Another disadvantage of this system is that it may be difficult to initiate movement, especially after certain production failures. Another problem is that the outsourcing system requires a place and arrangement of the strip between the reel and the press, which is not negligible. The significant length of the unwound strip may destroy the removal accuracy and increase the consumption of the strip length.

Disclosure of Invention

One of the objects of the present invention is to propose a device for unrolling a web for embossing that allows at least partially solving at least one of the above drawbacks.

The object of the present invention is a device for unwinding a strip for a platen press, which allows the strip to be pressed to be accumulated in pre-unwound form between at least one pressing reel of the platen press and a platen press, characterized in that it comprises:

a central drum, configured to move in rotation with variable advancement speed, rotating in conjunction with the shaft of the device for unwinding the strip,

-a satellite wheel with an axis configured parallel to the axis of the central drum, wherein the satellite wheel is rotatable around the central drum and the pre-unwound band is windable around the central drum due to the movement of the satellite wheel, and

-a planetary guide device moving the satellite wheel around the central drum according to a difference between a rotational speed of the central drum and the rotational speed of an outer ring of the planetary guide device, the outer ring being configured to move rotationally at a constant speed in a rotational direction opposite to a rotational direction of the central drum.

The web material to be embossed is then pre-unwound at a constant speed on an embossing reel, which is drawn by the satellite rollers. The strip can be delivered at a variable advancing speed at the end of the device for unwinding the strip. The accumulated length of the strip to be embossed varies according to the circular motion of the satellite rollers around the central drum, said variation depending, due to the planetary guidance, on the difference between the rotation speed of the central drum and the outer ring. Therefore, it is possible to accumulate the to-be-stamped tape and then deliver the accumulated to-be-stamped tape according to each request of the guide shaft.

The device for unwinding the strip is more compact than the previous "linear" systems of the prior art, since it can be directly integrated into the machine. It is also stronger and easier to move. The distance between the reel and the press machine can be small, which can improve the placement accuracy of the strip material, so that the consumption of the strip material can be reduced.

According to one embodiment, the planetary guide device comprises:

-a central gear co-rotating and coaxial with the central drum when the central gear is coaxial with the outer strip,

-a satellite gate moving around the central drum in association with the satellite wheel, coaxial with the central drum, and

-at least one satellite gear mounted on the satellite door, engaged with the outer ring and the central gear, guided in rotation around the central drum in one direction or the other, according to the difference in the rotation speed of the central drum and the outer ring.

According to one embodiment, the original radius of the central gear corresponds to the outer radius of the central drum.

According to one embodiment, the diameter of the satellite wheel is sized smaller than the radial space between the original diameter of the outer ring and the outer diameter of the central drum.

According to one embodiment, the satellite wheel rotates.

For example, the planetary guide further includes a saw gear installed at the satellite door to move in conjunction with the satellite wheel and to be engaged with the outer ring. For example, the original radius of the serrated wheel corresponds to the outer radius of the satellite wheel.

According to another embodiment, the satellite wheel is fixed to the satellite gate of the planetary guide and the satellite wheel is perforated with an internal cavity configured to communicate with pressurized air to form an air cushion under the web to be embossed.

According to one embodiment, the planetary guide means comprise a guide track moving around the central drum in association with the satellite wheel, the guide track being apt to be inserted between the two strands of the pre-unwound strip to guide the outer strand of said strip.

According to one embodiment, the track comprises one to ten, for example five, additional satellite wheels, one or more of the additional satellite wheels and the satellite wheel being in the shape of a circle.

One or more of the additional satellite wheels rotate.

For example, the track may further include as many additional satellite wheels as there are serrated wheels mounted on the satellite door and rotating and engaging the outer ring in association with respective additional satellite wheels.

According to another embodiment, the guide track comprises a metal element fixed to the satellite port with between one and ten, for example five folds or bends, one or more of the folds or bends and the satellite wheel being rounded.

According to one embodiment, the diameter of the circle corresponds to the original diameter of the outer ring.

According to one embodiment, the outer ring is configured to be guided in rotation at a constant speed substantially equal to an average of the variable advancing speed.

According to one embodiment, the shaft of the central drum can be guided in rotation to variable advancement speeds by the motor of the device for unwinding the strip forming an advancement shaft. The number of parts can be reduced.

The invention also relates to a platen press for sheet-type elements, which is configured to place, on each sheet, a gold-or metal-plated film made of at least one strip to be stamped, characterized in that it further comprises at least one device for spreading out the strip according to the above description.

Drawings

Further advantages and characteristics will emerge from a reading of the description of the invention and of the attached drawings, which represent non-limiting examples of embodiment of the invention, in which:

figure 1 illustrates very schematically an example of a platen press.

Fig. 2 is a perspective view of the apparatus for unrolling a web of material of the platen press of fig. 1 (showing the transparent box).

Fig. 3 is another view of the apparatus of fig. 2 for unrolling a strip of material.

Fig. 4 shows a longitudinal section through the elements of the device for spreading a strip according to fig. 2.

Fig. 5 shows a transverse section a-a of the elements of the device for unrolling a strip of fig. 4.

Fig. 6 is a perspective view of the central drum and central gear of the apparatus for unrolling a strip material of fig. 2.

Fig. 7 is a perspective view of the outer ring and support of the device for unrolling a strip of fig. 2.

Fig. 8 is a perspective view of the planetary guide of the device for unwinding a strip of fig. 2.

Fig. 9 is another view of the planetary guide of fig. 8.

Fig. 10 shows a transverse section through the device for unrolling a web material according to fig. 2, the device for unrolling a web material being in a first extreme position when unrolling a web material to be stamped.

Fig. 11 shows a second extreme position similar to fig. 10.

Fig. 12 shows a perspective view of the elements of a device for unrolling a strip according to a second embodiment.

In these figures, like elements carry like reference numerals. The following embodiments are examples. Even if the description refers to one or more embodiments, this does not necessarily mean that each reference refers to the same embodiment, or that the features only apply to a single embodiment. Simple features of different embodiments may also be combined or interchanged to provide further embodiments.

Detailed Description

The terms "upstream" and "downstream" are defined according to the longitudinal movement direction of the sheet D (fig. 1). The sheet moves from upstream to downstream, generally along the longitudinal main axis of the machine, at a speed that stops periodically.

The terms "element in the form of a sheet" and "sheet" are to be considered equivalent and also include elements made of folded and flat cardboard, paper or any other material currently used in the packaging industry. In this context, "paper" or "sheet element" or "element in the form of a sheet" very generally denotes any support for the impression in the form of a sheet, such as cardboard, paper, plastic sheet, etc.

The terms "top", "bottom", "low", "high", "horizontal" and "vertical" are defined in terms of the arrangement of components in the molding machine placed on the floor.

Fig. 1 shows an embodiment of a platen press 1, which platen press 1 is capable of providing each sheet with a gold-plated or metallic film produced by at least one stamping strip 2, in particular for the manufacture of packages.

The machine 1 generally consists of a plurality of work stations 100, 200, 300, 400, 500, which work stations 100, 200, 300, 400, 500 are arranged side by side but interdependent with one another to form a unified whole to process a series of sheet-like elements. Thus, there is a feeder 100, edge stop 200, embossing station 300, web feed station 400 and receiving station 500. A transfer device 600 is also provided to move each sheet individually from the output end of the edge stop 200 to the receiving station 500, including through the embossing station 300.

In this particular embodiment, chosen by way of example only, the sheets are successively lifted from the top of the stack by the suction gripper which delivers them to the immediately adjacent edge stop 200.

At the level of the edge stop 200, the sheets are placed in the stack by means of a suction gripper, that is to say the sheets are placed one after the other in a partially overlapping manner. The entire stack is then guided along a plane in the direction of the embossing station 300 by means of a belt-driven transport mechanism. At the end of the stack, the head plies may be systematically and precisely positioned by using a front wedge and side wedges or a registration system.

The station immediately behind the edge stop 200 is the embossing station 300. The function of the embossing station 300 is to place, by hot embossing, on each sheet a metal film made of the embossed web 2. For this, a plate press 310 is used, and a pressing operation is performed in a general manner inside the plate press 310 between a fixed upper heating plate 320 and a lower plate 330 installed to move for vertical back and forth movement.

The feeding station for the strip 400 is loaded to ensure both the feeding of the stamped strip 2 into the machine 1 and the simultaneous emptying of said strip 2, which has been used once after the transfer to the stamping station 300.

The process of processing sheets in the platen press 1 is completed in the receiving station 500, where the main function is to repackage already processed sheets into stacks of sheets. To this end, the transport device 600 is, for example, configured to automatically release the sheet when the sheet is found to be aligned with the new stack of sheets. The sheet will then fall vertically on top of the stack.

In general, the transport device 600 sets a series of gripper bars, which are mounted to be movable by means of two sets of chains 620, the two sets of chains 620 being arranged laterally on each side of the platen press 1. Each set of chains 620 runs in a loop that allows the gripper bars to pass in sequence along a trajectory through the embossing station 300, the web feed station 400 and the receiving station 500.

The clamp bar combination will move away from the stop position, accelerate, reach maximum speed, decelerate, and then stop, while describing a cycle corresponding to the movement of the sheet from one station to the next. The chain 620 moves and stops in such a cycle that during each stop all gripper bars holding the sheet pass from one station to the adjacent downstream station. The operation of each station is synchronized with this cycle, which is referred to as the machine cycle. The workstation starts a new job at the beginning of each machine cycle.

The feeding station for the strip 400 comprises at least one device 10 for unwinding the strip, which can accumulate the stamped strip 2 in pre-unwound form downstream of at least one stamping reel 3 and can feed the pre-unwound strip according to each request of the advancing axis of the machine 1.

For this purpose, the device 10 for unwinding the web is inserted between at least one embossing reel 3 and the platen press 310 (fig. 1).

In addition, it can be seen from figures 2 to 11 that the device 10 for unwinding the strip comprises a central drum 11, satellite rollers 14 and planetary guides 15.

The central drum 11 is configured to be guided in rotation at a variable advancement speed, which rotates integrally with the shaft 16 of the device 10 for unwinding the strip. In each machine cycle, the forward speed controlled by the machine 1 is increased and then decreased (which may be referred to as "forward") and then stopped. This advancement step (advance before stop) allows the strip 2 to be embossed to coincide with the sheet intended to be laid, by embossing the metal film according to a predefined program in the machine 1. The advance between each stop may be the same or different, or the advance between at least two consecutive and periodic stops may be different.

The satellite wheel 14 carries an axis 21, which axis 21 is parallel to the axis 16 of the central drum 11. The satellite wheels 14 are rotatable about the central drum 11.

In operation, the pre-unwound strip may be wound (at least one revolution) around the central drum 11 by movement of the satellite rollers 14. More precisely, after passing through the satellite rollers 14, the pre-unwound strip is wound around the central drum 11, forming a lever of the pre-unwound strip (fig. 10 and 11).

According to one embodiment, the planetary guide 15 comprises a central gear 12, an outer ring 13, a satellite gate 17 and at least one satellite gear 20 (fig. 4 and 5).

The central gear 12 rotates integrally with the central drum 11 and is coaxial with the central drum 11 (fig. 6). For example, they are fixed to the shaft 16 (fig. 4). Such as bearings, support the opposite ends of the shaft 16.

For example, the original radius of the central gear 12 corresponds to the outer radius of the central drum 11 (fig. 6).

The outer ring 13 is toothed (fig. 7). Which is coaxial with the central gear 12 and is configured to be guided in rotation at a constant speed. "constant" refers to a substantially constant velocity, that is, an average velocity that varies by less than +/-10%, for example. The constant speed is for example substantially equal to the average of the variable forward speeds.

The outer ring 13 rotates in the opposite direction to the central drum 11. The direction of rotation of the outer ring 13 can be selected such that rotation of the outer ring 13 unwinds the impression spool 3.

For example, the outer ring 13 is carried by a support 19, which support 19 is mounted rotatably on the shaft 16 by means of bearings (fig. 4). In the axial direction, the central gear 12 is inserted between the central drum 11 and the support 19 of the outer ring 13.

For example, the diameter of the satellite rollers 14 is smaller than the radial gap between the original diameter of the outer ring 13 and the outer diameter of the central drum 11, so that the inner strand of the web 2 to be printed wound on the central drum 11 is inserted between the satellite rollers 14 and the central drum 11 without getting stuck.

The satellite gate 17 moves jointly with the satellite roller 14 around the central drum 11 and is coaxial with the central drum 11. For example, the satellite door 17 is rotatably mounted on the shaft 16 by means of bearings (fig. 4).

By way of example, the satellite door 17 is formed on the one hand by a disc 17a, for example a solid disc, with a bearing at its centre, and on the other hand by a ring 17b, which ring 17b is fixed coaxially to the disc 17a and supports flat bearings for the shaft of at least one satellite gear 20 and for the shafts of toothed wheels 18 and 24 (see later on) (fig. 4, 8 and 9).

At least one satellite gear 20 is mounted on the satellite door 17. Which on the one hand engages the outer ring 13 and on the other hand engages the central gear wheel 12, is guided to rotate in one direction or the other of the central drum 11 depending on the difference in rotational speed of the central drum 11 and the outer ring 13. The movement of the at least one satellite gear 20 causes the satellite bearings 14 to move around the central drum 11, thereby varying the length of the pre-unwound strip.

The planetary guide 15 comprises, for example, four satellite gears 20, in the example of a cruciform shape (see fig. 5, 8 and 9), mounted on the satellite doors 17.

The satellite gear 20 transmits the guide of the outer ring 13 and the guide of the central gear 12 to the satellite door 17 and moves in association with the satellite bearing 14. The satellite gears 20 themselves are not connected to any satellite bearings.

For example, the diameter of at least one satellite gear 20 is approximately greater than the diameter of the satellite bearing 14.

The satellite gear 20, the central gear 12 and the outer ring 13 are configured at one end of the shaft 16, substantially in the same plane. For example, they are received into a cassette 28 (fig. 2 and 3). The configuration of these engaged articles is also referred to as an "epicycloidal train" or "planetary guide" where the "planetary inner" or "sun" is the central gear 12 and the "planetary outer" or "ring" is the outer ring 13 and the "satellite" engages and rotates about their common axis, i.e. the satellite gear 20 and the "common axis" is the axis 16.

According to one embodiment, the satellite bearing 14 is rotating and is rotating on its own about its axis 21. Thus, the embossed tape 2 can be rolled without rubbing around the satellite bearings 14.

According to one embodiment, the planetary guide 15 comprises a saw-toothed wheel 18 mounted on the satellite gate 17, which saw-toothed wheel 18 moves in conjunction with the satellite wheel 14 and engages with the outer ring 13. For example, the serrated wheel 18 and satellite bearing 14 are mounted on a shaft 21 at the end of the satellite bearing 14 (FIG. 4). The flat bearing areas support the opposite ends of the shaft 21 of, for example, the satellite bearings 14. For example, the original radius of the serrated wheel 18 corresponds to the outer radius of the satellite bearing 14. The circumferential rotational speed of the satellite bearing 14 thus corresponds to the rotational speed of the outer ring 13, to which the web material 2 to be imprinted is unwound from the imprinting reel 3. The web material 2 to be imprinted is thus guided by the satellite bearing 14 at the same speed as it is unwound from the imprinting reel 3.

According to another embodiment, the satellite scroll 14 is non-rotating. For example, it is fixed to the satellite door 17. In this case, the satellite 14 may be porous and provide an internal cavity configured to be placed in communication with pressurized air to form an air cushion under the web 2 to be printed, so that the web 2 to be printed may wrap around the satellite 14 without friction.

According to one embodiment, the planetary guide 15 further comprises a guide track 22, which guide track 22 moves jointly with the satellite wheels 14 around the central drum 11 (fig. 8 and 9).

The guide 22 can be inserted between two strands of pre-unwound strip 2, the inner strand of the strip 2 to be printed abutting against the central drum 11 and the outer strand serving to guide the outer strand of the strip (fig. 10 and 11).

According to one embodiment, track 22 includes one to ten, such as five, additional satellite wheels 23, wherein one or more of the additional satellite wheels 23 and satellite wheels 14 are in the shape of a circle C (fig. 9). For example, the additional satellite dishes 23 and the satellite dishes 14 are regularly spaced, for example on a circular arc comprised between 90 ° and 180 °. Guide track 22 may also include a retaining element 34 to retain and guide the opposite end of additional satellite rollers 23 around shaft 16.

One or more additional satellite scroll wheels 23 may rotate. The outer strand of the pre-unwound strip can thus actually slide over the additional rotary satellite wheel 23 without rubbing.

In the example of fig. 1 to 11, the track 22 comprises one to ten, for example five, additional rotary satellite wheels 23 and as many saw-toothed wheels 24 as possible mounted on the satellite doors 17 (fig. 5 and 8). The serrated wheels 24 rotate in association with their respective additional satellite wheels 23. Which are respectively mounted at the axial ends of the additional satellite wheels 23 and engage with the outer ring 13. The flat bearing areas may support the opposite ends of each additional satellite wheel 23.

For example, the additional satellite wheels 23 and serrated wheels 24 are similar in diameter size to the satellite wheels 14. The inner strand of web material 2 to be printed can be inserted without jamming between the satellite wheel 14 and the additional satellite wheel 23 on the one hand, and the central drum 11 on the other hand.

The diameter of said circle C of the outer ring 13 corresponds approximately to the original diameter of the outer ring 13. The additional satellite wheel 23 has a circumferential rotational speed which corresponds to the rotational speed of the outer ring 13, at which the web material 2 to be printed is unwound from the printing reel 3. The web material 2 to be imprinted is thus guided by the satellite bearing 14 at the same speed as it is unwound from the imprinting reel 3.

The web material 2 to be embossed from the embossing reel 3 can thus be guided by the additional satellite rollers 23 so that the outer strands follow approximately the original diameter of the outer ring 13, the outer strands being approximately parallel to the inner strands of the web material wound around the central drum 11. In addition, with the additional satellite wheel 23, the guiding of the outer strands is close to circular, which avoids interruptions in the unwinding of the strip.

The guide 22 can also comprise a plate 32 or an element of plate fixed to the satellite gate 17 in the shape of a circular arc so as to guide the inner strand of web 2 to be printed against the central drum 11 (fig. 8 to 11).

Between the embossing reel 3 and the device 10 for unwinding the web material, the web material 2 to be embossed is oriented tangentially to the additional satellite wheel 23, for example by means of an entry lever 26. On leaving the device 10 for spreading the strip, the strip 2 to be stamped can be leveled in a horizontal position by means of the exit lever 27 in order to guide the strip 2 to the plane in the platen press 310 (fig. 1).

According to one embodiment, the device 10 intended for unwinding the strip comprises an electric motor 25, the motor 25 being configured to direct the shaft 16 of the central drum 11 to a variable advancing speed (fig. 3 and 4). For example, the motor 25 is directly connected to the end of the shaft 16. A shaft 16, rotating in association with the central drum 11 to unwind the strip 2 to be printed, also forms an advancing shaft. The number of parts can be reduced.

The device 10 for unwinding the strip may also comprise an advancing roller 29, which roller 29 is pressed against the central drum 11 to ensure good transfer between the strip 2 to be printed and the central drum 11 (fig. 1).

The outer ring 13 can be guided in rotation at a constant speed by an auxiliary motor 31 of the device 10 for unwinding the strip (fig. 3). For example, the auxiliary motor 31 guides the outer ring 13 via a pulley system.

In operation, the outer ring 13 is induced to rotate at a constant speed, for example, a rotational speed approximately equal to the average of the variable forward speeds (counterclockwise in the example of fig. 10 and 11).

When the forward speed is zero (fig. 10), the satellite wheel 14 (in this case in a counterclockwise direction of rotation) is guided around the central drum 11 by the outer ring 13. The movement of the satellite rollers 14 has the effect of increasing the length of the pre-unwound strip, thereby accumulating the reserve of strip. Fig. 10 thus shows the first extreme position of the satellite wheel 14, for which the reserve of pre-unwound strip is greatest. When the satellite wheel 14 moves around the central drum 11 to reach this first extreme position, the placement of the gold-plated or metal film on the sheet is done in the platen press 310.

Then, as the forward speed increases (fig. 11), the central drum 11 is directed into rotation in the opposite direction to the outer ring 13 (clockwise in fig. 11), directing the satellite rollers 14 to rotate in the same direction, which reduces the length of the pre-unwound strip fed to the embossing station 400. Fig. 11 shows an example of the second extreme position of the satellite wheel 14, for which the reserve of pre-unwound strip is minimal.

Then, the forward speed is decreased until stopped. The satellite wheel 14 is thus guided (in the anticlockwise direction here) around the central drum 11 by the outer ring 13 until it returns to the first extreme position (figure 10). A new machine cycle is then started and execution continues.

The web 2 to be imprinted is then pre-unwound at a constant speed on the imprinting reel 3, which is drawn by the satellite rollers 14. Upon leaving the device 10 for unwinding the strip, the strip is conveyed at a variable advancing speed given by the central drum 11. The accumulated length of the strip 2 to be imprinted varies according to the circular movement of the satellite rollers 14 around the central drum 11, which, due to the planetary guidance, depends on the difference between the rotation speeds of the central drum 11 and the outer ring 13. Therefore, it is possible to accumulate the tape 2 to be stamped and then deliver the accumulated tape 2 to be stamped according to each request of the guide shaft.

If a plurality of reels 3 are fed to the embossing station 300 at the same advance speed, the plurality of reels 3 can also be unwound together with the device 10 for unwinding the web material.

It will be appreciated that the device 10 for unwinding the strip is more compact than the previous "linear" systems of the prior art, since it can be directly integrated into the machine 1. It is also stronger and easier to move. The distance between the reel 3 and the press machine 310 can be small, which can improve the placement accuracy of the strip material, so that the consumption amount of the strip material can be reduced. The unwinding of the embossing roll 3 can be continuously braked during the production process by means of the braking device, ensuring a minimum strip tension in a gentler manner, thus avoiding intermittent deterioration of the strip.

Fig. 12 shows a further exemplary embodiment of a device 10' for spreading a strip.

This example differs from the previous examples in that the guide rail 33 comprises a metal element, for example a metal sheet or such as sheet metal, exhibiting 1 to 10, for example 5, folds or bends 30.

The axial ends of the metal elements are fixed to the satellite doors 17. The guide rail 33 may also include a retaining element 34 to retain and guide the opposite end of the metal element around the shaft 16.

The folds or bends 30 and the satellite rollers 14 (e.g., shafts 16 in the radial direction) are circular and coaxial with the outer ring 13. The diameter of the circle corresponds for example approximately to the original diameter of the outer ring 13.

For example, the folds or bends 30 are regularly spaced, for example on a circular arc comprised between 90 ° and 180 °.

The outer strands of the pre-unwound strip may actually slide over the folds or bends 30 without rubbing. The strip 2 to be stamped coming from the stamping reel 3 can thus be guided by the folds and the bends 30 so that the outer strands approximately follow the original diameter of the outer ring 13, the outer strands being approximately parallel to the inner strands of the strip wound around the central drum 11. The more folds or bends 30, the more nearly circular the outer strands are directed, which avoids discontinuities in the unwinding of the strip.