WO2014057143A1

WO2014057143A1 - Unit for unwinding/winding a web

Info

Publication number: WO2014057143A1
Application number: PCT/ES2013/000214
Authority: WO
Inventors: Joaquin Amat Cano; Jordi PRAT GRIL
Original assignee: Comexi Group Industries, Sau
Priority date: 2012-10-09
Filing date: 2013-09-27
Publication date: 2014-04-17

Abstract

The invention relates to a unit comprising a rotating structure (1) that is rotatably supported between two walls of a frame (2), and first and second shafts (3a, 3b) supported on a plate of the rotating structure (1) in an overhanging manner. Actuating means cause the first and second shafts (3a, 3b) to rotate about the axes thereof, and other actuating means cause the rotating structure (1) to rotate about a horizontal axis (E) alternately positioning the first and second shafts (3a, 3b) in a working position and a replacement position. When activated, retractable supporting means associated with the rotating structure (1) support distal ends of the first and second shafts (3a, 3b) during the rotation of the rotating structure (3a, 3b) about the horizontal axis (E). The coils are installed on, or removed from, the first and second shafts (3a, 3b) by means of a movement in an axial direction.

Description

DESCRIPTION

COIL BAND REWINDING / REWINDING UNIT Field of technique

The present invention relates in general to a reel winding / rewinding unit of sheet web, and more particularly to a unwinder / rewinding unit comprising two reel shafts installed in a rotating support structure that is rotated to alternately position the reel shafts. in a work position and a coil replacement position. The unwinder / rewinder unit can act as a unwinder unit and as a rewinder unit depending on the position in which the unit is installed in a sheet strip treatment machine, the arrangement of some of its components or accessories, and the mode of operation according to which it is controlled.

By way of example, the unwinder / rewind unit of the present invention is applicable to longitudinal strip web cutting machines, adhesive or lacquer application machines on sheet web, sheet web drilling or microperforation machines, etc. Background of the invention

International patent application WO 20121641 15 A1 discloses a reel unit winding belt, which comprises two parallel winding shafts, supported in cantilever on a turntable and independently operated to rotate around respective horizontal axes. In turn, the turntable is actuated to rotate about a horizontal axis of rotation parallel to the winding trees with respect to a first vertical wall of a bench to arrange the winding trees alternately in a working position and in a position of replacement. Drive means linearly move the winding shafts and their respective drive devices along a diametral direction of the turntable between peripheral positions and central positions. On a second vertical wall of the bed, opposite said first vertical wall, carriages are provided movably provided with jaws that support the distal end of each of the winding trees at least along a portion of its displacement linear during the formation of a coil.

In operation, the winding shaft that is in the working position, on which the forming coil is installed, is gradually displaced towards the center of the turntable as the diameter of the coil grows. When the forming coil reaches the desired diameter, the corresponding shaft is approximately in a central position. Then the turntable rotates 180 degrees so that the shaft that was in the replacement position during the winding, and on which an empty mandrel is installed, is changed from the replacement position to the working position and A new coil is started on the empty mandrel. Next, the winding shaft on which the finished coil is installed is moved from the central position to the replacement position and the finished coil is removed and replaced by another empty mandrel.

A drawback of the winding unit of the aforementioned international patent application WO 2012164115 A1 is the relative complexity of mechanisms that involves moving linearly the winding shafts along the diametral direction of the turntable and moving linearly at the same time the carriages provided with jaws along the second vertical wall of the frame.

Another drawback of the winding unit of the aforementioned international patent application WO 20121641 15 A1 is that it is specifically designed to act as a winding or rewinding machine and is not useful for acting as an unwinder.

Exhibition of the invention

The present invention contributes to mitigating the foregoing and other inconveniences by providing a rewinder / rewinder unit for sheet strip treatment machine comprising a main frame including a drive side wall and an operating side wall between which a structure is mounted. swivel stand so that it can rotate around a horizontal axis of rotation. This rotating support structure comprises a drive side plate rotatably supported on said drive side wall and an operating side plate rotatably supported on said operating side wall, and said drive side plate and said operating side plate are rigidly connected to the to each other for some structural elements.

The rotating support structure carries first and second coil shafts parallel to said horizontal axis of rotation, and located in fixed positions, on opposite sides of the horizontal axis of rotation in a diametral direction, and at symmetrical distances from the axis of horizontal rotation. Each of the first and second coil shafts has a proximal end rotatably connected to the drive side plate and a free distal end, so that said first and second coil shafts are supported in cantilever on the drive side plate. Thus, sheet web coils or coil mandrels can be installed in or removed from the first and second reel shafts by a movement in an axial direction by a movement in an axial direction from the operating side of the main frame. To this end, the operating side plate of the rotating support structure comprises recesses or openings sized so as not to interfere with the reels of the sheet web when they are installed or removed from the first and second reel shafts in the axial direction, and the operative side wall of the main frame has a corresponding recess or opening formed in a position corresponding to a replacement position to allow the coils to pass.

The unwinder / rewind unit includes shaft drive means that independently rotate said first and second coil shaft around their respective axes of rotation, and drive means of rotating support structure that rotate the rotating support structure around of the horizontal axis of rotation to alternately place the first and second reel shafts in a working position and a replacement position. Preferably, in the working and replacement positions the axes of rotation of the two coil shafts and the horizontal axis of rotation are in a horizontal plane.

The unwinder / rewind unit further comprises retractable support means associated with the rotating support structure which, when activated, support the distal ends of the first and second reel shafts during turns of the rotating support structure around the horizontal axis of rotation. and preferably while certain operations are performed when the rotating support structure is stopped. Thus, said retractable support means prevent the bending of the first and second reel shafts due to the weight of the coils, which would occur if the distal ends of the first and second overhang supported reel shafts were not supported.

In one embodiment, these retractable support means comprise first and second support arms movably mounted on the operating side plate of the rotating support structure and first and second jaws mounted on said first and second support arms, respectively . The first and second support arms are moved by arm actuation means between an inactive position, in which the first and second support arms do not interfere with said reels of sheet web when they are installed in or removed from the first and second winding trees, and an active position in which said first and second jaws are adjacent to the distal ends of the first and second trees of coil, respectively. The said first and second jaws are opened and closed by means of jaw actuation means for grasping and releasing the distal ends of the first and second coil shafts, respectively, when the first and second support arms are said active position.

An auxiliary jaw is mounted on the operative side wall of the main frame, which when activated supports the distal end of that of the first or second coil shaft that is in the working position, at least during periods of time in which the first and second support arms are in said inactive position.

This auxiliary jaw is mounted on an auxiliary mobile support connected by means of guides to the operating side wall of the main frame, and support actuating means move said auxiliary mobile support between a retracted position, in which the auxiliary mobile support and the auxiliary jaw does not interfere with the distal end of the first or second reel shaft when the rotating support structure rotates around the horizontal axis of rotation, and a support position, in which the auxiliary jaw is adjacent to the distal end of that of the first or second winding trees that are in the working position and ready to grab it. Auxiliary jaw drive means are mounted on the auxiliary mobile support that open and close the auxiliary jaw to grip and release the distal end of that of the first or second coil shaft that is in the working position when the mobile support auxiliary is in said support position.

In one embodiment, the first and second support arms are rigidly attached to each other forming a part, which is connected to an inner side of the operating side plate of the rotating support structure so that they can rotate around the axis. of horizontal rotation. In this case, the said arm drive means comprise first and second cylinders of dynamic fluid, each of which has a first end connected to the operating side plate of the rotating support structure and a second end connected to one of the first and second support arms. Alternatively, and since the first and second arms form a single rigid piece, a single dynamic fluid cylinder would be sufficient.

In another embodiment, the first and second arms are independent, and are connected to an inner side of the operating side plate of the rotating support structure so that they can rotate about respective axis of rotation or about a common axis of rotation , such as the axis of horizontal rotation. In this embodiment, said arm drive means comprise first and second dynamic fluid cylinders, each of which has a first end connected to the operative side plate of the rotating support structure and a second end connected to one of the first and second support arms, so that the movements of the first and second arms are independently actuated. In such a case, the auxiliary jaw could be omitted.

The unwinder / rewinder unit comprises a guiding, splicing and cutting device mounted on a mobile frame, which is guided in a guided way to the main frame on one side of the rotating support structure corresponding to the first and second working position. winding trees. The mobile frame is moved by means of frame actuation between a withdrawn position, in which the mobile frame and said guide, splice and cutting device do not interfere with one of the reels of sheet strip installed in one of the first or second winding shaft when the rotating support structure rotates around the horizontal axis of rotation, and at least one operative position, in which the guiding, splicing and cutting device interacts with that of the reels of sheet web which is installed in that of the first or second coil trees that is in the working position and / or with the sheet band that is being unwound or rewound.

The guiding, splicing and cutting device comprises a treadmill that guides a path of the sheet web that is being unwound or rewound. In one embodiment, this treadmill is mounted on a movable tread roller support, which is movably connected to the movable frame, for example such that the movable roller roller support can rotate about a rotation axis parallel to said axis of horizontal rotation. The mobile roller roller support is moved by means of a roller roller support actuator between a remote position, in which the roller roller is not in contact with that of the reels of the web of foil that is installed in that of the first or second reel shafts that is in the working position when the mobile frame is in said operative position, and a contact position, in which said treadmill presses the web of foil that is being unwound or rewound against that of the reels of sheet strip that is installed in that of the first or second reel shafts that is in the working position when the mobile frame is in the operative position.

The guiding, splicing and cutting device comprises a cross-cutting element mounted on a mobile support of the cutting element mobilely connected to the mobile frame. Said mobile cutting element support is moved by means of cutting drive between a passive position, in which said cross-cutting element is separated from a path of the sheet web which is being unwound or rewound, and a position cutting, in which the Transversal cutting element penetrates said path of the sheet web that is being unwound or rewound and cuts the web of sheet.

The rotating support structure preferably comprises a plurality of guide rollers parallel to the horizontal axis of rotation located in a peripheral region thereof between the drive side plate and the operating side plate. These guide rollers are supported so that they can rotate freely, so that they support and guide the sheet band during the rotation of the rotating support structure and optionally while performing certain operations when the rotating support structure is stopped. For example, the guide rollers are arranged so that they can rotate around connecting rods connected at their ends to the drive side plate and the operating side plate. In one embodiment, these connecting rods are part of the aforementioned structural elements that rigidly connect the drive side plate and the operating side plate to each other.

Up to now, the unwinder / rewinder unit of the present invention has been described according to a basic configuration, which can be adapted very easily to act as a unwinder unit or as a rewind unit.

For example, said guide rollers are installed in the rotating support structure in different positions when the unwinder / rewind unit operates as a unwinder unit and when it operates as a rewind unit. For this, the drive side plate and the operating side plate of the rotating support structure comprise a first set of fixing elements and a second set of fixing elements, so that when the unwinder / rewind unit must be configured to operate as the unwinder unit the connecting rods around which the said guide rollers rotate are installed in said first set of fixing elements, while when the unwinder / rewinder unit must be configured to operate as the rewind unit the connecting rods around of which the guide rollers rotate are installed in said second set of fasteners.

On the other hand, when the unwinder / rewinder unit is configured to operate as a unwinder unit, it includes a diameter detector that detects the diameter of a replacement coil installed in one of the first or second reel shafts during the rotation of the structure of rotating support that moves here of the first or second reel shafts in which said replacement reel is installed from the replacement position to the working position. In such a case, the unwinder / rewind unit includes other control means that stop the rotation of the rotating support structure in a splice position in which the first or Second coil shaft on which the replacement coil is installed is in an angular position selected according to the diameter detected by said diameter detector.

In this splicing position, the guiding, splicing and cutting device acts to cut the tail of the film strip that is still being unwound from a coil about to run out and splice said tail with the start of the film band coil replacement. Next, the mobile frame on which the guiding, splicing and cutting device is mounted is moved to its removed position and the rotating support structure is rotated to move the bobbin shaft on which the replacement coil is installed from the position from splice to work position.

When the unwinder / rewind unit is configured to act as a rewind unit, it includes first and second auxiliary tread rollers parallel to the horizontal axis of rotation mounted so that they can freely rotate in first and second movable structures mobilely connected to the support structure. swivel These first and second auxiliary tread rollers are associated with the first and second reel shafts, respectively. In such a case, the unwinder / rewind unit includes auxiliary tread roller support drive means that independently move each of said first and second movable structures between a separate position, in which the corresponding first or second auxiliary tread roll does not interfere with a reel of web sheet when it is installed in or removed from the corresponding first or second reel shaft by a movement in the axial direction, and a contact position, in which the corresponding first or second auxiliary treadmill presses against a completed web belt reel or a reel web reel about to be completed installed in the corresponding first or second reel shaft.

In one embodiment, the unwinder / rewind unit of the present invention comprises a rotating electrical joint through which a supply current of the various electric motors and other devices installed in the rotating support structure as well as control signals of the same.

In another embodiment, the rotating electrical joint only conveys the supply current and the unwinder / rewind unit further comprises wireless communication means for transmitting the control signals between electronic control means installed in the main frame and an electronic control device. installed on the rotating support structure 1. Preferably, these wireless communication means comprise a radio frequency system, such as a wireless local area network (Wi-Fi). Brief description of the drawings

The foregoing and other features and advantages will become more apparent from the following detailed description of some embodiments with reference to the attached drawings, in which:

Fig. 1 is a perspective view of a unwinder / rewinder unit for sheet web treatment machine according to an embodiment of the present invention configured to act as a unwinder unit;

Fig. 2 is a schematic side view of the unwinder / rewinder unit configured to act as a unwinder unit;

Fig. 3 is a perspective view of the unwinder / rewind unit showing an outer side of a drive side wall of a main frame thereof;

Fig. 4 is a perspective view of a rewind / rewind unit according to an embodiment configured to act as a rewind unit; Fig. 5 is a schematic side view of the unwinder / rewind unit configured to act as a rewind unit;

Figs. 6A-6F are schematic side views illustrating a sequence of coil change operations using the unwinder / rewinder unit configured as a unwinder unit; Y

Figs. 7A-7F are schematic side views illustrating a sequence of coil change operations using the unwinder / rewinder unit configured as a rewind unit. Detailed description of some embodiments

Figs. 1 and 2 show a rewinder / rewinder unit for sheet web treatment machine according to the present invention, which is configured to act as a unwinder unit. However, in relation to Figs. 1 and 2 will first describe those elements of the unwinder / rewinder unit that are common to the unwinder unit configuration and the rewinder unit configuration.

The unwinder / rewinder unit comprises a main frame 2 formed by a drive side wall 4 and an operating side wall 5 (partially shown) connected to each other by connecting bars 38. Between the drive side wall 4 and the operator side wall 5 of the frame Main 2 is arranged a rotating support structure 1 mounted so that it can rotate around a horizontal axis of rotation E.

This rotating support structure 1 comprises a drive side plate 6 rotatably supported on the drive side wall 4 and an operating side plate 7 rotatably supported on the operator side wall 5 of the main frame 2, and structural elements, such as connecting bars 8 and crossbars 37a, 37b, which rigidly connect the drive side plate 6 and the operating side plate 7 to each other.

The drive side wall 4 of the main frame 2 has an opening 26 in which the drive side plate 6 of the rotating support structure 1 is installed. The drive side plate 6 of the main frame 2 has a coaxial peripheral circular track 24 with the horizontal pivot axis E that is supported and rolls on guide wheels 25 mounted so that they can freely rotate in the drive side wall 4 and located around said opening 26. The operating side plate 7 of the structure of swivel support 1 is rotatably connected to the operative side wall 5 of the main frame 2 by a central journal 36 coaxial with the horizontal axis of rotation E.

The rotating support structure 1 has first and second coil shafts 3a, 3b parallel to said horizontal axis of rotation E. Each of these first and second coil shafts 3a, 3b has a proximal end rotatably connected to the plate of rotation. drive side 6 and a free distal end, so that the first and second coil shafts 3a, 3b are supported in a cantilever on the drive side plate 6. This allows reels of reed band or empty chucks to be installed in or removed from the first and second coil shafts 3a, 3b by a movement in an axial direction thereof.

Each of the first and second reel shafts 3a, 3b includes a clamping device for attaching the reel band coils or empty mandrels to the first and second reel shafts 3a, 3b. These clamping devices can be of a conventional type and are driven by a dynamic fluid controlled by solenoid valves (not shown).

The first and second coil shafts 3a, 3b are located on the drive side plate 6 in fixed diametrically opposite positions and symmetrical distances from the horizontal axis of rotation E, so that the axes of rotation of the first and second coil trees 3a , 3b and the horizontal axis of rotation E are in a plane. The operating side plate 7 comprises recesses 9 dimensioned so as not to interfere with the sheet web coils when they are installed in or removed from the first and second coil shafts 3a, 3b by said movement in the axial direction.

The unwinder / rewind unit comprises shaft drive means that independently rotate said first and second coil shaft 3a, 3b around their respective rotation axes, and drive means of rotating support structure that rotate said structure of rotating support 1 around said horizontal axis of rotation E to alternately place the first and second reel shafts 3a, 3b in a working position and a replacement position. Said plane comprising the axes of rotation of the first and second coil shafts 3a, 3b and the horizontal axis of rotation E is in a horizontal position when the first and second coil shafts 3a, 3b are in the working position and in the replacement position (Figs. 1 to 4).

The operating side wall 5 of the main frame 2 comprises a recess or opening (not shown) facing the replacement position of the first and second reel shafts 3a, 3b and dimensioned so as not to interfere with a reel of web sheet when the it is installed in or removed from that of the first and second reel shafts 3a, 3b which is in the replacement position by means of said movement in the axial direction.

The rotating support structure 1 comprises, in a peripheral region thereof, a plurality of guide rollers 21 parallel to the horizontal axis of rotation E extending between the driving side plate 6 and the operating side plate 7. In the Illustrated embodiment, these guide rollers 21 are supported so that they can freely rotate around connecting rods 8 that are part of said structural elements that rigidly connect the drive side plate 6 and the operating side plate 7 to each other. other. During the rotation of the rotating support structure 1 around the horizontal axis of rotation E, and during other periods of operation of the unwinder / rewind unit, the guide rollers 21 support and guide the sheet band above the horizontal axis of rotation E and of the first and second coil shafts 3a, 3b.

As best shown in Fig. 3, the drive side plate 6 of the rotating support structure 1 is integral with a central shaft 49 coaxial with the horizontal axis of rotation E, which extends towards the outer side of the wall of drive side 4 of the main frame 2. Said central shaft 49 has a free end rotatably supported on a complementary support 50 fixed to the wall of the drive side 4 of the main frame 2. Said shaft drive means comprise first and second electric motors 22a, 22b installed on respective supports 51 fixed on an outer side of the drive side plate 6 of the rotating support structure 1. Each of said first and second motors Electrical 22a, 22b is operatively connected by a mechanical transmission including a gear reducer and a pulley and belt mechanism to one of the first and second reel shafts 3a, 3b to rotate it. Thus, the first and second electric motors 22a, 22b and their mechanical transmissions rotate together with the drive side plate 6 of the rotating support structure 1 and the first and second coil shafts 3a, 3b connected thereto.

The aforementioned rotating support structure drive means comprise an electric motor 27 (Fig. 3) installed on an outer side of the drive side wall 4 of the main frame 2. This electric motor 27 is operatively connected through a housing of gears for rotating a pinion 28 (Figs. 2 and 5) meshed with a cogged gear ring 29 with the horizontal axis of rotation E formed or fixed on the outer perimeter of the drive side plate 6 of the rotating support structure 1.

The unwinder / rewind unit further comprises retractable support means associated with the rotating support structure 1, which, when activated, support distal ends of the first and second reel shafts 3a, 3b during the turns of the structure of rotating support 1 around the horizontal axis of rotation E and for other periods of time during operation of the unit.

These retractable support means comprise first and second support arms 10a, 10b rigidly joined to each other forming a single piece, which is connected to an inner side of the operating side plate 7 of the rotating support structure 1 of so that the first and second support arms 10a, 10b can rotate together around the horizontal axis of rotation E. At the ends of the first and second support arms 10a, 10b, respectively, first and second jaws 11a, 11b are mounted respectively.

The first and second support arms 10a, 10b are moved by arm drive means comprising first and second dynamic fluid cylinders 30a, 30b, each of which has a first end connected to the operating side plate 7 of the rotating support structure 1 and a second end connected to one of the first and second support arms 10a, 10b. When activated, these first and second dynamic fluid cylinders 30a, 30b move the first and second support arms 10a, 10b between an inactive position, in which the first and second support arms 10a, 10b do not interfere with said reels of web sheet when they are installed in or removed from the first and second reel shafts 3a, 3b, and an active position in which said first and second jaws 1 1a, 1 1 b are adjacent to the distal ends of the first and second coil shafts 3a, 3b, respectively.

On the first and second support arms 10a, 10b are installed jaw drive means, such as respective first and second dynamic fluid cylinders 39a, 39b, which open and close said first and second jaws 1 1 a, 1 1 b for gripping and releasing said distal ends of the first and second reel shafts 3a, 3b, respectively, when the first and second support arms 10a, 10b are said active position.

The unwinder / rewinder unit further comprises an auxiliary jaw 12 mounted on the wall of the operating side 5 of the main frame 2. When this auxiliary jaw 12 is activated, said support supports a distal end of that of the first or second reel shafts 3a, 3b which is in the working position provided that the first and second support arms 10a, 10b are in said inactive position and optionally for other periods of time.

The auxiliary jaw 12 is mounted on an auxiliary mobile support 13 connected to the operating side wall 5 of the main frame 2 so that it can run along guides 40. Support drive means, such as for example a cylinder of dynamic fluid 41, move the auxiliary mobile support 13 between a retracted position, in which the auxiliary mobile support 13 and the auxiliary jaw 12 do not interfere with the distal end of the first or second coil shaft 3a, 3b when the support structure Swivel 1 rotates around the horizontal axis of rotation E, and a support position, in which the auxiliary jaw is adjacent to the distal end of that of the first or second coil shaft 3a, 3b which is in the working position.

On the auxiliary mobile support 13 are mounted auxiliary jaw drive means, such as a dynamic fluid cylinder 42, which open and close the auxiliary jaw 12 to grasp and release the distal end of that of the first or second coil shafts. 3a, 3b which is in the working position when the auxiliary mobile support 13 is in said support position.

The unwinder / rewinder unit further comprises a guiding, splicing and cutting device 14 located on one side of the rotating support structure 1 adjacent to said working position of the first and second reel shafts 3a, 3b. This a guiding, splicing and cutting device 14 is mounted on a mobile frame 15, which is connected to the main frame 2 by means of guides 43. Rack drive means move said mobile frame 15 between a removed position, in which the mobile frame 15 and said guide, splice and cut device 14 do not interfere with one of the sheet web coils installed in one of the first or second reel shafts 3a, 3b when the rotating support structure 1 rotates around the horizontal axis of rotation E, and at least one operating position, in which the guiding, splicing and cutting device 14 is disposed in a position suitable for interacting with that of the reels of sheet web which is installed in that of the first or second reel shafts 3a, 3b which is in the working position and / or with the sheet band that is being unwound or rewound.

Said frame drive means comprise an electric motor 44 (Fig. 3) operatively connected through a reduction mechanism to rotate a shaft 45 that drives pulley sets 46a, 46b located on the drive side and on the operating side of the main frame and on which respective belts 47 are mounted (Figs. 1, 3 and 4). The mobile frame 15 is connected to said belts 47 by a connection 48. The electric motor 44 is controlled so that it can place and stop the mobile frame 15 at any desired intermediate position between the withdrawn position and the operating position. In addition, since the diameter of the reel of web of sheet which is in the first or second reel shaft 3a, 3b located in the working position varies gradually as the web of reel that is unwound or rewound, the position The operation of the mobile frame 15 is gradually varied according to the frame drive means.

The guiding, splicing and cutting device 14 comprises a tread roller 16 that guides a path of the sheet web that is being unwound or rewound. This treadmill 16 is mounted on a movable tread roller support 17 movably connected to the movable frame 15 so that it can rotate about an axis of rotation parallel to said horizontal axis of rotation E by means of roller support drive means treadmill comprising, for example, dynamic fluid cylinders 52 (Figs. 2 and 5).

Thus, said dynamic fluid cylinders 52 move the movable roller roller support 17 between a separate position, in which the tread roller 16 separated from that of the sheet web coils that is installed in that of the first or second shafts of coil 3a, 3b which is in the working position when the movable frame 15 is in the said operative position, and a contact position, in which the treadmill 16 presses the sheet web being unwound or rewind against that of the sheet web coils that is installed in that of the first or second reel shafts 3a, 3b that is in the working position when the mobile frame 15 is in the operative position.

The guiding, splicing and cutting device 14 also comprises a cross-cutting element 18 mounted on a mobile support of cutting element 19 mobilely connected to the mobile frame 15, for example so that it can swing around an axis parallel to the axis of horizontal rotation E. Cutting drive means, including for example dynamic fluid cylinders 53 (Figs. 2 and 5), move said mobile support of cutting element 19 between a passive position, in which said cutting element transverse 18 is separated from a path of the sheet web which is being unwound or rewound, and a cutting position, in which the cross-cutting element 18 penetrates the sheet web that is in said path and cuts the sheet band when the mobile frame 15 is in the operative position.

The unwinder / rewinder unit of the present invention, from a basic configuration including the elements described so far, can be configured to act as a rewinder unit or as a rewind unit by small variations in the arrangement of some of the elements and / or by including some additional elements, as described below. Obviously, the control means that control the devices and drive of the unwinder / rewinder unit are also configured differently when the unwinder / rewinder unit acts as a unwinder unit and as a rewind unit.

Thus, the arrangement of the guide rollers 21 is different when the unwinder / rewind unit operates as a unwinder unit and when it operates as a rewind unit. For this, the drive side plate 6 and the operating side plate 7 of the rotating support structure 1 comprise first and second sets of fixing elements 31, 32 provided for the installation of the connecting rods 8 around which the guide rollers 21 rotate, so that the connecting rods 8 with the guide rollers 21 are installed in the first set of fixing elements 31 of when the unwinder / rewinder unit is configured to operate as a unwinder unit (Figs. 1 and 2) and in the second set of fixing elements 32 when the unwinder / rewind unit is configured to operate as a rewind unit (Figs. 3 and 4).

When the unwinder / rewinder unit is configured to operate as a unwinder unit (Figs. 1 and 2) it further comprises a diameter detector 20 (shown in Fig. 2) fixed for example to the operating side wall of the main frame 2, which detects the diameter of a replacement coil BR installed in that of the first or second coil shaft 3a, 3b which is located in the replacement position during the rotation of the rotating support structure 1 that moves this first or second reel shaft 3a, 3b in which the replacement coil BR is installed from the replacement position to the working position. The diameter detector 20 cooperates with control means during a coil replacement operation when the unwinder / rewinder unit operates as a unwinder unit, as will be explained in detail below in relation to Figs. 6A-6F.

When the unwinder / rewind unit is configured to operate as a rewind unit (Figs. 4 and 5) it also comprises first and second auxiliary tread rollers 33a, 33b parallel to the horizontal axis of rotation E mounted on the rotating support structure 1. Said first and second auxiliary tread rollers 33a, 33b are mounted so that they can freely rotate in respective first and second mobile structures 34a, 34b mobilely connected to the rotating support structure 1. More specifically, the first and second mobile structures 34a, 34b can swing around one of the connecting bars 8 parallel to the horizontal axis of rotation E installed in the second set of fasteners 32, and around which respective guide rollers 21 rotate.

Auxiliary tread roller support drive means, such as for example first and second dynamic fluid cylinders 35a, 35b, move the first and second movable structures 34a, 34b between a separate position, in which the first and second rollers Auxiliary presses 33a, 33b do not interfere with reels of sheet strip when they are installed in or removed from the first and second reel shafts 3a, 3b by a movement in an axial direction, and a contact position, in which one of the first and second auxiliary tread rollers 33a, 33b presses against a coil of completed sheet belt BC installed in one of the first or second reel shafts 3a, 3b.

As shown in Figs. 4 and 5, for this purpose, the rotating support structure 1 comprises first and second support cross members 37a, 37b extending between the drive side plate 6 and the operating side plate 7, and each of said first and second Dynamic fluid cylinders 35a, 35b has a first end connected to one of said first and second support cross members 37a, 37b and a second end connected to one of the first and second mobile structures 34a, 34b. The unwinder / rewinder unit of the present invention comprises a rotary electrical joint 23 coaxial with the horizontal axis of rotation E, which is arranged to carry the supply current transport of the various electric motors 22a, 22b, 27, 44 installed in the rotating support structure 1 between conductive cables associated with the main frame 2 and conductive cables associated with the rotating support structure 1.

Optionally, the unwinder / rewind unit further comprises wireless communication means for transmitting control signals between electronic control means installed in the main frame 2 and an electronic control device installed in the rotating support structure 1. Preferably, said Wireless means of communication comprise a radio frequency system. In one embodiment, this radio frequency system is a wireless local area network (Wi-Fi) that includes a first access point to said wireless local area network (Wi-Fi) located in mainframe 2 and a second point of access to the wireless local area network (Wi-Fi) installed in the rotating support structure 1.

Thus, since all electrical signals between the electronic control means in the main frame 2 and the different electronically controllable devices installed in the rotating support structure 1, such as the different electric motors, can be transmitted through said means of Wireless communication, said rotary electrical joint 23 (Fig. 3) is reserved for carrying out only the supply of power supply of the first and second electric motors 22a, 22b, of the electric motor 27 of rotating support structure drive, and of the electric motor 44 that rotate the shaft 45, so that the rotating electric joint 23 can be relatively simple, reliable and economical.

Each of the first and second electric motors 22a, 22b that rotate the first and second coil shafts 3a, 3b is associated with a frequency converter and an angular position detector, which are controlled by said electronic control means by motor control signals transmitted through said wireless communication means to independently regulate the speeds and directions of rotation of the first and second coil shafts 3a, 3b.

The electronic control means also control the said solenoid valves (not shown) associated with the clamping devices installed in the first and second reel shafts 3a, 3b, which are actuated by a dynamic fluid, such as pressurized air, to hold said reel band coils or empty mandrels to the first and second reel shafts 3a, 3b. These solenoid valves they are controlled by the electronic control means by means of clamping control signals transmitted through the wireless communication means.

Said first and second dynamic fluid cylinders 30a, 30b that move the first and second support arms 10a, 10b and said first and second dynamic fluid cylinders 39a, 39b that open and close the first and second jaws 11a, 11b they are operated, for example, by pressurized air and are controlled by solenoid valves (not shown), which in turn are controlled by means of support control signals transmitted by the wireless communication means to temporarily support the distal ends of the first and second reel shafts 3a, 3b during turns of the rotating support structure 1.

Optionally, in the rotating support structure 1, coil diameter detectors (not shown) arranged to detect the diameter of a reed web coil installed in any of the first and second reel shafts 3a, 3b are installed. These diameter detectors generate coil diameter control signals that are transmitted to the electronic control means by the wireless communication means.

Optionally, the rotating support structure 1 further comprises at least one safety barrier (not shown) that generates a safety control signal when activated by a user or operator. This security control signal is also transmitted to the electronic control means by the wireless communication means.

Alternatively, the unwinder / rewinder unit of the present invention may not include the wireless communication means, and in that case the different control signals may be transmitted through the rotating electrical joint 23.

In relation to Figs. 6A-6F now describes the operation of the unwinder / rewinder unit of the present invention when it operates as a unwinder unit.

Fig. 6A shows the unwinding unit with the first reel shaft 3a located in the working position and the second reel shaft 3b in the replacement position. In the first coil shaft 3a there is a working coil BT which is being unwound in cooperation with the guide, splicing and cutting device 14, and in the second coil shaft 3b a full replacement BR coil has been installed. The auxiliary jaw 12 is activated by supporting the distal end of the first winding shaft 3a, while the first and second jaws 11a, 11b are deactivated and the first and second support arms 10a, 10b on which they are mounted are in The inactive position. Fig. 6A shows the BT work coil in a state close to being depleted.

Next, as shown in Fig. 6B, the first and second support arms 10a, 10b are moved to the active position and the first and second jaws 11a, 11b are activated to grip and support the distal ends of both first and second coil trees 3a, 3b. Once the first and second jaws 11a, 11b are activated, the auxiliary jaw 12 is opened and the auxiliary mobile support 13 on which it is mounted is moved to the withdrawn position.

Fig. 6C illustrates the next step, which consists in removing the mobile frame 15 on which the guiding, splicing and cutting device 14 is installed to the removed position and initiating the rotation of the rotating support structure 1 in the direction shown by an arrow to move the first coil shaft 3a on which the working coil BT is installed from the working position to the replacement position and the second coil shaft 3b on which the replacement coil BR is installed from the replacement position to the work position. During the rotation of the rotating support structure 1, the sheet band is still unwound from the working coil BT installed in the first reel shaft 3a while being supported by the guide rollers 21 at the top of the support structure Rotating 1. Also during rotation of the rotating support structure 1, the diameter detector 20 detects the diameter of the replacement coil BR when it passes through the bottom of the rotating support structure 1.

Next, control means stop the rotation of the rotating support structure 1 in a splice position shown in Fig. 6D, in which the second coil shaft 3b on which the replacement coil BR is installed is parked. at an angular position selected based on the diameter of the replacement coil BR detected by the diameter detector 20. Then, the mobile frame 15 on which the guide, splice and cut device 14 is installed is moved to a cutting position and splicing in which the tread roller 16 and the cross-cutting element 18 of the guiding, splicing and cutting device 14 cooperate with each other to cut the tail of the BT work coil, which is practically finished, and adhere it at the beginning of the replacement coil BR.

Fig. 6E shows how following the cutting and splicing operation the mobile frame 15 with the guiding, splicing and cutting device 14 is moved to the withdrawn position, and the rotating support structure 1 is further rotated to position the second winding shaft 3b on which the replacement coil BR is in the working position and the first coil shaft 3a on which the working coil BT is on the replacement position Then the mobile frame 15 with the guiding, splicing and cutting device 14 is moved back to the operative position to rewind the replacement coil, which has now become the new BT work coil. The previous BT work coil is now an empty MV, or almost empty mandrel located in the replacement position.

Finally, as shown in Fig. 6F, the auxiliary jaw 12 is open and the auxiliary mobile support 13 on which the auxiliary jaw 12 is mounted is moved back to the support position and the auxiliary jaw 12 is closed to grip the end. distal of the second coil shaft 3b, which allows opening the first and second jaws 11a, 11b and moving the first and second support arms 10a, 10b to the inactive position while the sheet band is still unwound from the new work coil BT. In this situation, the empty mandrel MV can be axially removed from the first coil shaft 3a located in the replacement position and replaced by a new replacement coil

The situation shown in Fig. 6F corresponds to the situation shown in Fig.

6A, with the difference that now the first coil shaft 3a is in the replacement position and the second coil shaft 3b is in the working position. Thus, the positions of the first and second coil shafts 3a, 3b are cyclically alternated in the work and replacement positions.

In relation to Figs. 7A-7F now describes the operation of the unwinder / rewind unit of the present invention when it operates as a rewind unit.

Fig. 7A shows the unwinding unit with the first reel shaft 3a located in the working position and the second reel shaft 3b in the replacement position. In the first coil shaft 3a a coil in BF formation is located which is being rewound in cooperation with the guiding, splicing and cutting device 14, and in the second coil shaft 3b an empty mandrel MV has been installed. The auxiliary jaw 12 is activated by supporting the distal end of the first coil shaft 3a, while the first and second jaws 1 1a, 11 b are deactivated and the first and second support arms 10a, 10b on which they are mounted are in the inactive position. Fig. 7A shows the coil in BF formation in a state close to completion.

Then, as shown in Fig. 7B, the second auxiliary tread rollers 33b is moved to the contact position to press the coil in formation BF close to completion, the first and second support arms 10a, 10b are moved to the active position. and the first and second jaws 11a, 11b are activated to grip and support the distal ends of both first and second coil shafts 3a, 3b. Once the first and second jaws 1 1a, 11 b are activated, the auxiliary jaw 12 is opened and the auxiliary mobile support 13 on which it is mounted is moved to the withdrawn position.

In relation to Fig. 7C, the mobile frame 15 with the guiding, splicing and cutting device 14 is then moved to the withdrawn position and the rotation of the rotating support structure 1 in the direction shown by an arrow to move is initiated. the first coil shaft 3a on which the coil in formation BF is installed from the working position to the replacement position and the second coil shaft 3b on which the empty mandrel MV is installed from the replacement position to the position of work. During the rotation of the rotating support structure 1, the sheet band is still rewound in the bobbin in formation BF installed in the first reel shaft 3a while the sheet band is supported by the guide rollers 21 at the top of the rotating support structure 1, and the second auxiliary tread rollers 33b continue to press the coil in BF formation close to completion.

As shown in Fig. 7D, once the rotation of the rotating support structure 1 is completed, the coil in formation BF is in the replacement position and the empty mandrel MV is in the working position. Next, the movable frame 15 on which the guiding, splicing and cutting device 14 is installed is moved to the operating position in which the treadmill 16 and the cross-cutting element 18 of the guiding, splicing and cutting device 14 cooperate with each other to cut the tail of the coil in BF formation, which is practically completed, and adhere the start of the sheet band thus formed to the empty mandrel MV. During these operations, the distal ends of both first and second coil shafts 3a, 3b are still supported by the first and second support arms 10a, 10b and first and second jaws 11a, 1 1 b.

Then, as shown in Fig. 7E, the movable frame 15 with the guide, splice and cutter device 14 remains in the operative position to rewind the sheet web on the empty mandrel, which has now become the new coil in BF formation, while the previous coil in formation is now a completed coil BC located in the replacement position. The second auxiliary tread rollers 33b helps adhere the tail end of the sheet web to the completed coil BC. The auxiliary mobile support 13 on which the auxiliary jaw 12 is mounted is moved to the support position and the auxiliary jaw 12 is closed to grip and support the distal end of the second coil shaft 3b on which the new coil is located in BF training in the work position. Finally, as shown in Fig. 7F, while the sheet band is still rewinding in the new coil in BF formation, the first and second jaws 11 a, 1 1 b are open and the first and second support arms 10a, 10b they are moved to the inactive position, which allows axially removing the completed coil BC from the first coil shaft 3a located in the replacement position and replacing it with a new empty mandrel MV.

The situation shown in Fig. 7F corresponds to the situation shown in Fig. 7A, with the difference that now the first coil shaft 3a and the elements associated therewith are in the replacement position and the second coil shaft 3b and the elements associated with it are in the working position. Thus, the positions of the first and second coil shafts 3a, 3b are cyclically alternated in the work and replacement positions.

One skilled in the art will be able to introduce modifications and variations in the exemplary embodiment shown and described without departing from the scope of the present invention as defined in the appended claims.

Claims

1. - Unwinder / rewinder unit for sheet strip treatment machine, comprising a rotating support structure (1) supported on a main frame (2) so that it can rotate around a horizontal axis of rotation (E), about first and second coil shafts (3a, 3b) parallel to said horizontal axis of rotation (E) supported on said rotating support structure (1), shaft drive means that independently rotate said first and second coil shafts ( 3a, 3b) around their respective axes of rotation, and drive means of rotating support structure which rotate said rotating support structure (1) around said horizontal axis of rotation (E) to alternately position the first and second winding shafts (3a, 3b) in a working position and a replacement position, characterized in that:

said rotating support structure (1) comprises a drive side plate (6) rotatably supported in a drive side wall (4) of said main frame (2) and an operating side plate (7) rotatably supported in a wall of operating side (5) of the main frame (2), said drive side plate (6) and said operating side plate (7) being rigidly connected to each other by structural elements;

the first and second coil shafts (3a, 3b) are supported in cantilever on the drive side plate (6) in diametrically opposite positions and at symmetrical distances from the horizontal axis of rotation (E); Y

the operating side plate (7) comprises recesses (9) sized so as not to interfere with reels of sheet strip when they are installed in or removed from the first and second reel shafts (3a, 3b) by a movement in one direction axial;

and because it further comprises retractable support means associated with the rotating support structure (1) that when activated support distal ends of the first and second coil shafts (3a, 3b) at least during the turns of the support structure rotating (1) around the horizontal axis of rotation (E).

2. - Unwinder / rewind unit according to claim 1, characterized in that said retractable support means comprise:

first and second support arms (10a, 10b) movably mounted on the operator side plate (7);

first and second jaws (11a, 11b) mounted on said first and second support arms (10a, 10b), respectively; arm actuating means that move the first and second support arms (10a, 10b) between an inactive position, in which the first and second support arms (10a, 10b) do not interfere with said reels of sheet web when they are installed in or removed from the first and second coil shafts (3a, 3b), and an active position in which said first and second jaws (11a, 11b) are adjacent to distal ends of the first and second shafts of coil (3a, 3b), respectively; Y

jaw drive means that open and close said first and second jaws (11a, 11b) to grasp and release said distal ends of the first and second coil shafts (3a, 3b), respectively, when the first and second arms of support (10a, 10b) are said active position.

3. - Unwinder / rewinder unit according to claim 1 or 2, characterized in that an auxiliary jaw (12) is mounted on said operating side wall (5) of the main frame (2), and when said auxiliary jaw is activated (12) it supports a distal end of that of the first or second coil shafts (3a, 3b) that is in said working position at least when the first and second support arms (10a, 10b) are in said inactive position.

4. - Unwinder / rewinder unit according to claim 3, characterized in that the auxiliary jaw (12) is mounted on a mobile auxiliary support (13) guided in a guided way to the operative side wall (5) of the main frame (2), and because support drive means move said auxiliary mobile support (13) between a retracted position, in which the auxiliary mobile support (13) and said auxiliary jaw (12) do not interfere with said distal end of the first or second shaft of coil (3a, 3b) when the rotating support structure (1) rotates around the horizontal axis of rotation (E), and a support position, in which the auxiliary jaw is adjacent to the distal end of that of the first or second winding trees (3a, 3b) that is in the working position.

5. - Unwinder / rewind unit according to claim 4, characterized in that there are provided auxiliary jaw drive means mounted on the auxiliary mobile support (13) that open and close said auxiliary jaw (12) to grasp and release the distal end of that of the first or second coil shaft (3a, 3b) that is in the working position when the auxiliary mobile support (13) is in said support position.

6. - Unwinder / rewinder unit according to claim 1 or 2, characterized in that a movable frame (15) in which a guide, splice and cutting device (14) is mounted is guided in a guided manner to the main frame (2) in one side of the rotating support structure (1) adjacent to said working position of the first and second reel shafts (3a, 3b), and frame drive means are provided that move said mobile frame (15) between a removed position, in which the mobile frame (15) and said guiding, splicing and cutting device (14) do not interfere with one of the reels of reed band installed in one of the first or second reel shafts (3a, 3b ) when the rotating support structure (1) rotates around the horizontal axis of rotation (E), and at least one operating position, in which the guiding, splicing and cutting device (14) interacts with that of the band coils of sheet that is installed in that of the first or second coil trees (3a, 3b) that is in the working position and / or with the sheet band that is being unwound or rewound.

7. - Unwinder / rewind unit according to claim 6, characterized in that the guiding, splicing and cutting device (14) comprises a tread roller (16) guiding a path of the sheet web that is being unwound or rewound, said said tread roller (16) mounted on a mobile tread roller support (17) movably connected to the mobile frame (15) so that it can be moved by means of tread roller support drive means between a separate position, in which said treadmill (16) is not in contact with that of the reels of sheet web which is installed in that of the first or second reel shafts (3a, 3b) that is in the working position when the mobile frame ( 15) is in said operative position, and a contact position, in which said tread roller (16) presses the sheet web that is being unwound or rewound against that of the web band coils sheet that is installed in that of the first or second coil shafts (3a, 3b) that is in the working position when the mobile frame (15) is in the operative position.

8. - Unwinder / rewind unit according to claim 6, characterized in that the guiding, splicing and cutting device (14) comprises a transverse cutting element (18) mounted on a mobile support of cutting element (19) connected in a mobile way to the mobile frame (15), and cutting drive means are provided that move said mobile support of cutting element (19) between a passive position, in which said cross-cutting element (18) is separated from a trajectory of the sheet band that is being unwound or rewound, and a cutting position, in which the transverse cutting element (18) penetrates said path of the sheet band that is being unwound or rewound and cuts the sheet band.

9. - Unwinder / rewinder unit according to claim 1 or 2, characterized in that the rotating support structure (1) comprises, in a peripheral region thereof, a plurality of guide rollers (21) parallel to the horizontal axis of rotation ( E) supported so that they can rotate freely between the drive side plate (6) and the operating side plate (7), where said guide rollers (21) support and guide the sheet band at least during the rotation of the rotating support structure (1).

10. - Unwinder / rewind unit according to claim 9, characterized in that the guide rollers (21) are arranged so that they can rotate around connecting bars (8) that are part of said structural elements that rigidly connect the plate of drive side (6) and the operator side plate (7) to each other.

1 1. - Unwinder / rewind unit according to claim 9 or 10, characterized in that the drive side plate (6) and the operating side plate (7) of the rotating support structure (1) comprise a first set of elements of fixing (31) provided for the installation of said guide rollers (21) when the unwinder / rewind unit operates as a unwinder unit and a second set of fixing elements (32) provided for the installation of the guide rollers (21) when The unwinder / rewind unit operates as a rewind unit.

12. Unwinder / rewinder unit according to claim 6, 7 or 8, characterized in that the unwinder / rewinder unit comprises, when operating as a unwinder unit, a diameter detector (20) that detects the diameter of a replacement coil (BR) installed in one of the first or second reel shafts (3a, 3b) during the rotation of the rotating support structure (1) that moves that of the first or second reel shafts (3a, 3b) in which said recess is installed replacement coil (BR) from the replacement position to the working position, and control means that stop the rotation of the rotating support structure (1) in a splice position in which the first or second coil shaft (3a, 3b) on which the replacement coil (BR) is installed is in an angular position selected according to the diameter detected by said diameter detector (20).

13.- Unwinder / rewind unit according to claim 6, 7 or 8, characterized in that the unwinder / rewind unit comprises, when operating as a rewinding unit, first and second auxiliary tread rollers (33a, 33b) parallel to the horizontal axis of rotation ( E) mounted so that they can freely rotate in first and second movable structures (34a, 34b) mobilely connected to the rotating support structure (1), and are provided with a means of auxiliary tread roller support drive moving said first and second movable structures (34a, 34b) between a separate position, in which the first and second auxiliary tread rollers (33a, 33b) do not interfere with reels of sheet web when they are installed in or removed from the first and second reel shafts (3a, 3b) by a movement in an axial direction, and a contact position, in which one of the first and second auxiliary tread rollers (33a, 33b) presses against a completed sheet web coil (BC) installed in one of the first or second reel shafts (3a, 3b).

14. - Unwinder / rewinder unit according to claim 13, characterized in that the rotating support structure (1) comprises first and second support cross members (37a, 37b) extending between the drive side plate (6) and the plate operating side (7), and said auxiliary tread roller drive means comprise first and second dynamic fluid cylinders (35a, 35b), each of which have a first end connected to one of said first and second cross-members of support (37a, 37b) and a second end connected to one of the first and second mobile structures (34a, 34b).

15. - Unwinder / rewind unit according to claim 1, characterized in that said shaft drive means comprise first and second electric motors (22a, 22b) installed on an outer side of the drive side plate (6) of the support structure rotating (1), each of said first and second electric motors (22a, 22b) being operatively connected by a mechanical transmission to rotate one of the first and second coil shafts (3a, 3b).

16. - Unwinder / rewind unit according to claim 15, characterized in that a rotating electrical joint (23) coaxial with the horizontal axis of rotation

(E) is arranged for transporting power supply of said electric motors (22a, 22b) and control signals thereof between conductive cables associated with the main frame (2) and conductive cables associated with the rotating support structure ( one ).

17.- Unwinder / rewind unit according to claim 15, characterized in that a rotary electrical joint (23) coaxial with the horizontal axis of rotation (E) is arranged for transporting supply current of at least said electric motors (22a, 22b) between conductive cables associated with the main frame (2) and conductive cables associated with the rotating support structure (1), and wireless communication means are arranged to transmit control signals between electronic control means installed in the frame main (2) and an electronic control device installed in the rotating support structure (1) and configured to control at least the operation of the first and second electric motors (22a, 22b).

18. - Sheet strip rewinder / rewinder unit according to claim 17, characterized in that said wireless communication means comprise a radiofrequency system.

19. - Sheet strip rewinder / rewind unit according to claim 18, characterized in that said radio frequency system includes a first access point to a wireless local area network (Wi-Fi) located in the main frame (2) and a second access point to said wireless local area network (Wi-Fi) installed in the rotating support structure (1).

20. - Sheet strip unwinder / rewind unit according to claim 17, 18 or 19, characterized in that each of said first and second electric motors (22a, 22b) is associated with a frequency inverter and an angular position detector controllable by motor control signals transmitted by said wireless communication means.

21. - Sheet strip unwinding / rewinding unit according to claim 17, 18 or 19, characterized in that each of the first and second reel shafts (3a, 3b) includes a clamping device driven by a dynamic fluid controlled by controllable solenoid valves by means of clamping control signals transmitted by said wireless communication means for attaching said reel band coils or empty mandrels to the first and second reel shafts (3a, 3b).

22. - Sheet strip unwinder / rewinder unit according to claim 17, 18 or 19, characterized in that the rotating support structure (1) includes retractable support means actuated by dynamic fluid actuators controlled by electrovalves controllable by means of support control signals transmitted by said wireless communication means to temporarily support distal ends of the first and second coil shafts (3a, 3b).

23. - Sheet strip unwinder / rewind unit according to claim 17, 18 or 19, characterized in that in the rotating support structure (1) coil diameter detectors are installed that generate coil diameter control signals transmissible by said wireless communication means to said electronic control means.

24. - Sheet strip unwinding / rewinding unit according to claim 17, 18 or 19, characterized in that the rotating support structure (1) comprises at least one safety barrier that generates a safety control signal transmissible by said means wireless communication to said electronic control means.

25. - Unwinder / rewind unit according to claim 1, characterized in that the drive side plate (6) of the rotating support structure (1) has a peripheral circular track (24) coaxial with the horizontal axis of rotation (E) which it rolls on guide wheels (25) mounted so that they can freely rotate in said drive side wall (4) of the main frame (2) and located around an opening (26) thereof, and the operating side plate ( 7) of the rotating support structure (1) is rotatably connected to the operative side wall (5) of the main frame (2) by a central journal (36) coaxial with the horizontal axis of rotation (E).

26. - Unwinder / rewinder unit according to claim 1 or 25, characterized in that said rotating support structure drive means comprise an electric motor (27) installed on an outer side of said drive side wall (4) of the main frame ( 2), said electric motor (27) being operatively connected to rotate a pinion (28) engaged with a toothed crown (29) coaxial with the horizontal axis of rotation (E) attached to the drive side plate (6) of the structure rotating support (1).

27. - Unwinder / rewind unit according to claim 1, characterized in that the first and second support arms (10a, 10b) are rigidly joined to each other forming a part connected to an inner side of the operating side plate (7) of the rotating support structure (1) so that they can rotate around the horizontal axis of rotation (E).

28. - Unwinder / rewind unit according to claim 27, characterized in that said arm drive means comprise at least one dynamic fluid cylinder (30a, 30b) having a first end connected to the operating side plate (7) of the rotating support structure (1) and a second end connected to one of the first and second support arms (10a, 10b).