巴西专利BR112014012394B1 unwinder to unwind spools of material onto the sheet, and method to unwind the spools of material to

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专利摘要:
REEL REWINDER AND REWINDING METHOD. Unwinder comprising: a first unwinding position (P2), in which a first spool (Bl) is positioned; a second unwinding position (P3), to which the first spool is transferred when it must be replaced by a second spool (B2); a hold position (Pl), in which the second spool (B2) is held on hold; a first unwinding member (13) arranged and controlled to initiate the rotation of the second spool (B2) when the first spool (Bl) is to be replaced by the second spool (B2). Furthermore, the unwinder comprises a second unwinding member (31) with at least one flexible endless element (33). The flexible endless element extends from the first unwinding position (P2) to the second unwinding position (P2), and is arranged and controlled in such a way that the first spool is kept in contact with said second unwinding member and in rotation by means of the second unwinding member (31) in the first unwinding position (P2), in the second unwinding position (P3) and while it is being transferred from the first unwinding position (P2) to the second unwinding position (P3) ).
公开号:BR112014012394B1
申请号:R112014012394-2
申请日:2012-11-15
公开日:2020-11-03
发明作者:Roberto Morelli；Angelo Benvenutti
申请人:Fabio Perini S.P.A；
IPC主号:

专利说明:

TECHNICAL FIELD
[001] The present invention relates to machines for converting or processing sheet material rolled into logs or spools. More specifically, the present invention relates to improvements to methods and devices for unwinding spools of sheet material, specifically, but not exclusively, spools of cellulose material, such as paper, "tissue" paper and the like, and for feeding said sheet material for one or more processing stations downstream of the unwinder. TECHNICAL STATUS
[002] In the papermaking field, for example, for the manufacture of articles made of tissue paper, such as toilet paper, paper towels or the like, it is customary to produce large diameter rolls by winding one or more layers of cellulose material. These large diameter spools are subsequently unwound by means of unwinders to feed the sheet material to the processing and converting stations, for the production of smaller diameter logs or other products, specifically semi-finished products intended for subsequent processing to obtain finished products intended for sale, such as toilet paper rolls, paper towel rolls, paper napkins and the like.
[003] The unwinders must be designed in such a way as to allow a quick replacement of an empty spool with a new spool which is kept in a waiting position. US-B-7,350,740 and US-B-7,500,634 describe unwinders that perform the replacement of an empty spool with a new spool automatically and without stopping the feeding of material on the sheet.
[004] W02006 / 077609 describes an unwinder, in which an empty spool is moved by means of a pair of guides from an unwinding position to an unloading position. Once the spool has been transferred from one to the other of the two positions mentioned above, a new spool is lowered from the top towards the unwinding station until it comes into contact with the unwinding belts below. The unwinder movement is stopped before the empty spool replacement step. Once the new spool has been positioned, the unwinder is rewired. In this case, to ensure a continuous supply of the sheet material downstream it is necessary to provide a "garland", that is, a supply of sheet material formed between a series of guide rollers with a distance between centers that can be varied to allow the supply of sheet material downstream of the wreath when there is no supply of sheet material upstream of said wreath.
[005] A similar unwinder is described in WO 2007/099570.
[006] WO 2010/121252 describes an unwinder in which a spool unwinding position and a waiting position for a new spool are provided. When the spool being unwound is empty, the sheet material is cut and the tail end of the sheet material is wound onto a suction roller. The empty spool is removed from the unwinding position and replaced with a new spool, which until that moment was held in the waiting position. The roll on which the tail of the cut sheet material has been rolled is moved in the direction of the new spool to provide the seam of the sheet material rolled over the new spool with the sheet material rolled over the roll once the seam of the two sheet material has been performed, the feed in the direction of the downstream stations can start again. Also in this prior art unwinder, a garland accumulator can be provided to ensure continuous supply to the production line downstream of the unwinder. This is also necessary in order to wrap an appropriate length of sheet material over the suction roller from the first empty spool.
[007] EP-1444154 describes an unwinder in which, to perform an automatic replacement of an empty spool with a new stand-by spool, three separate unwinding members are provided. A first main unwinding member comprises central unwinding systems, that is, systems which couple the sheet material spool on its geometric axis and rotate it. This first unwinding member performs most of the unwinding cycle for each spool. Next to the unwinding position, a waiting position is provided for a second spool intended to replace the first spool, when the latter is empty. To perform the replacement of the spool being unwound by a standby spool, the unwinding member is transferred together with the spool being unwound from the main unwinding position in the direction of the auxiliary unwinding position below. Here a second unwinding member is located which, coming into contact with the spool being unwound, keeps the last one in rotation and is responsible for executing the final part of the unwinding cycle. The first unwinding member can therefore be returned to the main unwinding position to receive the spool on hold, while the second unwinding member continues to keep the spool in rotation to supply the sheet material. The standby spool is rotated with a third with a third unwinding member. Beginning the unwinding of the standby spool, the front end of the spool is deposited on the final part of the sheet material still being unwound from the first spool, which is temporarily in a lower position and is unwound by the second unwinding member. In this way, the two sheet materials that come from the two spools are overlapped and fed together into the seam means positioned downstream. Once the front end of the new spool reaches the splicing medium, the seam is performed between the unwound sheet material of the first spool and the unwound sheet material of the second spool, so that the empty spool can be removed by cutting the material in the remaining sheet and the new spool previously on hold begins its actual unwinding cycle.
[008] These unwinders of the prior art have some problems. In some cases these machines are specifically complex, difficult to manage and have high manufacturing costs. Some of these are unable to perform the replacement of the spools without stopping the feeding of material on the sheet and, therefore, require a garland accumulator which increases the cost of the machine, its susceptibility to breaks and also the space necessary for the installation of the machine, with a consequent increase in the areas required for the conversion line, of which the unwinder forms the first block.
[009] In general, unwinders of the prior art can unwind the spools in one direction only.
[0010] Furthermore, many decoilers in the prior art use glue or adhesive tape to perform the splicing of the two layers that come from the almost empty spool and the new spool. This involves the need for consumables and relatively long preparation times. Furthermore, the adhesive material used in the splicing area, which is discarded and subsequently recycled, pollutes the cellulose material, which must therefore be properly treated before being recycled. SUMMARY OF THE INVENTION
[0011] According to one aspect, the invention provides a spool unwinder, specifically for spools of cellulose material, such as parent spools or large diameter spools that come from a paper mill, to feed the paper converting lines , such as lines for making logs, rolls, napkins or the like, which completely or partially overcome the problems of prior art machines and devices.
[0012] Substantially, according to an embodiment, an unwinder to unwind reels of material on a sheet is provided, which comprises: a first unwinding position, in which a first reel is positioned during at least part of an unwinding cycle; a second unwinding position, to which said first spool is transferred when it must be replaced by a second spool; a waiting position, in which said second spool is held on hold; a first unwinding member associated with said holding position, arranged and controlled to initiate rotation of said second spool when the first spool is to be replaced by the second spool. Furthermore, the unwinder comprises a second unwinding member which has at least one flexible endless element. Advantageously, the endless flexible member of the second unwinding member extends from the first unwinding position to the second unwinding position, and is arranged and controlled so that the first spool is kept in contact with said second unwinding and rotating member through said second unwinding member in the first unwinding position, in the second unwinding position and while it is being transferred from said first unwinding position to the second unwinding position.
[0013] As will be apparent from the description hereinafter, in this way the unwinder can perform the replacement of an almost empty spool with a new spool, previously arranged in a waiting position, without requiring to stop feeding material in the sheet, and, therefore, without any garland accumulator or magazine or similar. Alternatively, accumulators can be provided which are smaller in size than those required in systems in which the replacement of the two spools occurs by stopping the unwinding.
[0014] A continuous unwinding without the need to stop the rotation of the reels can happen using only two unwinding members, with a considerable simplification in relation to the prior art unwinding systems with automatic splicing. Additional advantages of embodiments of the invention will hereinafter be illustrated and will be clear from the description of the drawings, which show a non-limiting embodiment of the invention.
[0015] In advantageous modalities, the waiting position is above the first unwinding position, that is, the waiting position is at a greater height, more or less in the first unwinding position. The transfer of a spool from one of said positions can therefore take place with a specifically simple transfer device, for example, formed by a pivot arm or a pair of pivot arms.
[0016] In some embodiments, the first unwinding position is located between the second unwinding position and an exit of the unwinder material sheet. A splicing device can be arranged on the sheet material. In some specifically advantageous embodiments, the splice device is a mechanical device, in which one or more pressure wheels act against one or more countersinks. The sheet material of the two spools passes between the wheels and the countersinks and the two materials are joined by the effect of localized pressure exerted on the fibers (effect known as "blending").
[0017] Advantageously, the second unwinding member can be arranged and controlled to modify the path of the endless flexible element as a function of the position of the first spool with respect to the first unwinding position and the second unwinding position. Typically, it can be provided that the endless flexible element is guided around a plurality of guide rollers, at least one of which has a movable geometry axis to modify the path of the endless flexible element, and at least one of which is motorized. If necessary, an additional guide roller can be movable to recover the loosening of the endless flexible element caused by the gradual decrease in the diameter of the spool being unwound.
[0018] The roller with the movable geometry axis provided to modify the path of the endless flexible element can be arranged and controlled in such a way as to move from a lower to a higher position. When the roller is located in the upper position, the flexible endless element is positioned to act on a spool located in the second unwinding position. When the roller is located in the lower position, the position of the endless flexible element is such as to allow the empty spool to be transferred from the second unwinding position in the direction of an unloading position, without interfering with the second unwinding member. Furthermore, when the mobile roller is located in the lower position, the spool located in the second unwinding position stops being rotated.
[0019] In practical modalities the flexible endless element extends from the first unwinding position to the second unwinding position and has an active branch that moves from said first unwinding position in the direction of said second unwinding position or vice versa accordingly with the direction of rotation of the first spool.
[0020] In some embodiments, the endless flexible element extends between the second unwinding position and the splicing device for splicing the unwound sheet material from the first spool and the unfolding sheet material from the second spool, the first unwinding position being located between the second unwinding position and said splice device.
[0021] In advantageous modalities, counterpoints can be provided in the first unwinding position, which are controlled and arranged to axially couple the first spool and release the first spool to allow its movement in the direction of the second unwinding position. In other embodiments, other systems can be provided to retain the spool in the first unwinding position, for example, rollers for coupling the ends of the winding rod.
[0022] The transfer device that transfers the spools from the waiting position to the first unwinding position may be provided with articulation arms with seats formed by the mobile portions carried by said articulation arms. The seats can be provided with crazy wheels or other than members that allow the spool to rotate around its geometric axis under the action of the first unwinding member, while the same spool is attached to the aforementioned seat.
[0023] A transfer member may be provided to transfer the spools from the first unwinding position to the second unwinding position. The transfer member may comprise a car, or a pair of cars, movable along respective guides extending between the two unwinding positions. In advantageous embodiments, the same transfer member is also arranged and designed to be movable from the second unwinding position to an unloading position in which the empty spool is released.
[0024] To cut the sheet material coming from the almost empty spool, a cutting member may be provided, controlled and arranged to cut the sheet material from said first spool at the end of the unwinding. In this way, it is possible to stop the unwinding even before all the sheet material has been unwound. This is specifically useful for discarding the first turns, that is, the innermost turns, of each spool, which are usually wrinkled or damaged and cannot be used for production. The cutting member may comprise a smooth, or preferably serrated, mechanical blade. Other cutting systems, for example, laser cutting tools, water, compressed air, or the like, could also be used.
[0025] The cutting member is preferably associated with the second unwinding position, although other configurations are possible, for example, in the loading position, or in an intermediate position, or on the transfer member.
[0026] Preferably both the first unwinding member and the second unwinding member are peripheral unwinding members. Also projecting the first unwinding member as a peripheral unwinding member, that is, comprising one or more straps, sheets, blankets or other endless elements, the transfer of the spool in the first unwinding position and the control passage of the first member of unwinding for the second unwinding member and spool coupling by the crazy counterpoints positioned in the first unwinding position, are simplified.
[0027] Advantageously, an unwinder according to the invention can be controlled to unwind the spool in one direction or in the opposite direction. This is specifically useful and advantageous considering the following. The layer of cellulose material that comes from the continuous forming machine usually has two opposite surfaces which have different roughnesses in relation to each other. Specifically, when the cellulose material is treated with a Yankee cylinder, the surface of the layer in contact with the Yankee cylinder is smoother than the opposite surface. To obtain a better quality multi-layer product, two layers are preferably combined with each other in such a way that the smooth surface of each layer is facing out of the finished product. This requires the two spools to be unwound in opposite directions. The use of an unwinder that allows unwinding in one direction or the other simplifies plant layout and management.
[0028] In some embodiments of the invention, the unwinder uses a system to amend the layers by means of mechanical layer bonding. This allows the layers to be bonded without the use of glue or double-sided adhesive tapes, eliminating consumables and pollutants and simplifying operations for preparing the new spool on hold.
[0029] According to a further aspect, the invention relates to a method for unwinding the spools of material on the sheet and making a seam between a tail of a first sheet material unfolded from a first reel and a head of a se - second sheet material unwound from a second spool without stopping the sheet material feed, which comprises the steps of: - positioning said first spool in a first unwinding position; - position the second spool in a waiting position, in which a first unwinding member is arranged; - unwinding the first sheet material of said first spool by means of a second unwinding member; - before the unwinding of the first spool has finished, transferring said first spool from the first unwinding position towards a second unwinding position, keeping said first spool in rotation by means of said second unwinding member and continue to unwind said first sheet material; - put the second spool in rotation and transfer the second spool from the waiting position towards the first unwinding position while the second sheet material begins to unwind from the second spool; - mend the head of the second sheet material to the tail of the first sheet material.
[0030] According to advantageous modalities of the method of the present invention, the head of the second sheet material is placed on the first sheet material, while said first sheet material continues to unwind from the first spool and said second material in sheet is unwound from the second spool. Furthermore, the head of the second sheet material moves forward supporting the first sheet material towards a splicing device.
[0031] Additional advantageous features and modalities of the unwinder and the method according to the present invention are hereinafter described in greater detail and in the appended claims, which form an integral part of the present description. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The invention will be better understood following the description and accompanying drawings, which show a practical non-limiting modality of the unit according to the invention. More specifically, in the drawings: Figs. 1 to 6 show a sequence of operation of an unwinder according to the invention, also comprising the step of replacing an empty spool with a new spool, in a side view and partial section of an unwinder according to a possible embodiment; Fig. 1A shows an enlargement of one of the carriages that form the transfer member of the spools from the first unwinding position to the second unwinding position and from there to the unloading position; Fig. 7 shows a plan view according to VII-VII of Fig. 1; θ Figs. 8 to 10 show a sequence for replacing an empty spool with a new spool in a second mode of the unwinding cycle. DETAILED DESCRIPTION OF A MODALITY
[0033] With initial reference to Figs. 1 and 7, the main elements of an unwinder according to the invention will first be described in a possible embodiment. The unwinder, indicated as a whole with 1, comprises a load-bearing structure 3, on which means and devices are arranged that define: a waiting position for a new spool waiting to replace a spool being unwound; a first unwinding position, in which a spool being unwound is positioned for a part of the unwinding cycle; a second unwinding position, in which the spool being unwound is transferred in the final stage of supplying the material in a sheet wound around it; and an unloading position, in which the rod, mandrel or winding core, on which the spool has been wound, is transferred once the spool is empty or when it must be replaced for other reasons. In fact, it should be understood that a spool is normally used until it is empty and is replaced when empty. A spool is normally considered to be empty when the sheet material that remains around the winding core is very wrinkled and can no longer be used. In fact, it is known that when forming the paper mill spools the innermost part of the spool, that is, the first coiled turns, have coiling defects. This part of the sheet material is not used, it remains wound around the core of the spool to be replaced and can be recycled if necessary. It should also be considered that there may be situations in which it is necessary to replace the spool before it is empty, for example, before reaching the part of the sheet material to be discarded, as is known to those skilled in the art. The replacement cycle is substantially the same in both cases and henceforth, for the sake of simplicity, reference will always be made to replacing an empty spool, being understood that "empty" must be understood not only as a spool on which there is no longer an adequate amount of usable sheet material, but more widely also a spool, for which the unwinding cycle has been definitively or temporarily completed.
[0034] In the illustrated embodiment, the structure 3 comprises columns 5 on which the articulation arms 7 are articulated around a geometric axis AA, whose arms can perform an alternating rotation movement, that is, an articulation movement, of according to the double arrow f7. In Figs. 1 to 6 a single arm 7 is shown, but it should be understood that there are actually two arms symmetrically arranged on both sides of the machine to couple, at opposite ends, a rod with a new spool waiting. In general, the winding rod can be understood as the tubular winding core (usually made of cardboard, plastic, aluminum or other suitable material) equipped with end sleeves provided for catching the core by counterpoints and other members of the unwinder, hereinafter described below.
[0035] The movement according to the double arrow f7 is transmitted by an actuator, for example, a piston actuator - cylinder 9, the cylinder 9A of which is attached at 9B to the load-bearing structure 3, and the stem 9C of which it is articulated in 9B in the respective articulation arm 7. In some modalities, two different piston - cylinder actuators 9 can be provided, one for each arm 7 although it would also be possible to use a single actuator and if necessary a torsion to transmit the movement from one to the other of the two articulation arms 7. Instead of piston-cylinder actuators, it would be possible to use actuators of another type, for example, electric motors, hydraulic motors or similar.
[0036] Each articulation arm 7 has an end 7A which defines a seat 7B for housing the respective end of a standby reel B2. Each seat 7B has wheels 7R on which the ends of the winding rods AS of the waiting reels support, in order to allow the rotation of the spool supported on the seats 7B, for the purposes that will be explained hereinafter.
[0037] The end 7A of each arm is advantageously articulated in 7C in the respective articulation arm 7. The articulation movement according to the double arrow f7A can be transmitted to each end 7A of each articulation arm 7 by a respective actuator, for example, a piston actuator - cylinder 11, the cylinder 11A of which is articulated in 11B on the respective articulation arm 7, while the stem 11C is articulated in 11D at the corresponding end 7A of the respective arm 7.
[0038] The articulation arms 7 with the ends 7A and the relative actuators form a transfer device, for transferring the spools from a waiting position to a first unwinding position, as will be described hereinafter.
[0039] In the raised position, shown in Fig. 1, the articulation arms 7 with the end 7A and the respective seats 7B define a waiting position for the reel B2. In the illustrated embodiment, the two arms 7 are connected by a torsion bar 7T. The torsion bar 7T ensures synchronous movement of the two articulation arms 7. Furthermore, in the example shown (see Fig. 7) the torsion bar is also used to support a first unwinding member 13 arranged in an intermediate position between the two arms 7. In this embodiment, the first unwinding member 13 comprises a flexible endless element 15, for example, formed by one or more belts parallel to each other and guided around a first motorized roller 17 and around a second crazy roll 19. Each roll 17 and 19 can actually consist of several coaxial rollers or pulleys, for example, one for each belt that forms the unwinding member 13. From now on, for the sake of brevity, reference will always be made to "rollers" 17, 19. The roll 17 can be motorized, for example, by means of an electric motor 18. The roll 19 is mounted on the articulation arms 23 articulated around a geometric axis BB in order to articulate air according to the double arrow f13. In Figs. 1 to 6 only one articulation arm 23 is shown, but it should be understood that preferably two articulation arms 23 are provided, arranged side by side. The geometric axis of articulation BB of the arms 23 is supported by extensions 7X torsionally constricted on the torsion bar 7T and extending it in an intermediate position between the articulation arms (see Fig. 7), such that when the arms 7 articulate According to f7, the articulation axis BB of the arms 23 follows the rotation movement around the axis AA performed by the articulation arms 7, for the purposes that will be apparent from now on.
[0040] The articulation movement according to f13 is transmitted by means of an actuator 25 or a pair of actuators 25, one for each arm 23. The actuator or actuators 25 can, for example, be piston-cylinder actuators. Alternatively, a single actuator 25 can be provided with a torsion bar that transmits movement from one to the other of the two arms 23.
[0041] Approximately below the hold position, indicated with P1 in Fig. 1, a first unwinding position is defined and indicated as a whole with P2, in which a first reel B1 being unwound (Fig. 1) is located . The first unwinding position P2 is defined by a pair of crazy counterpoints 27, also shown in Fig. 7. The counterpoints 27 are provided with an axial movement to move in the direction and away from each other according to f27 to couple the opposite ends of a winding rod AS of the spool B1, which is located in the unwinding position and releasing said spool allowing its transfer in the direction of a second unwinding position, indicated as a whole with P3. The second unwinding position P3 is located, with respect to the first unwinding position P2, on the side opposite the exit of sheet material N1 from the unwinder 1 in the direction of the downstream station (not shown). In other words: the first unwinding position P2 is located between the sheet material exit from the unwinder and the second unwinding position P3.
[0042] To keep the reel B1 in rotation when it is located in the first unwinding position P2, a second unwinding member, indicated as a whole with 31, is provided. In the illustrated embodiment, the second unwinding member 31 comprises at least one flexible endless element 33, which forms a peripheral unwinding element, that is, which transmits the rotation movement through the friction contact with the reel B1. side cylindrical surface of the spool. In some embodiments, the endless flexible element 33 can be formed by an endless belt. Preferably, however, said flexible endless element 33 is formed by a plurality of parallel belts all guided around the identical path defined by guide rollers or series of guide pulleys, at least one of which is motorized and the others preferably being crazy. In the illustrated embodiment, the endless flexible element 33 extends from the exit area of sheet material N1 to the second unwinding position P3. In some embodiments, in addition to the endless flexible member 33 that extends over the aforementioned length, smaller auxiliary flexible endless members can be provided, for example, which extend only in the area of the first unwinding position P2, and the which move at the same speed as the endless flexible member 33. This is because, as will be apparent from now on, the spool in position P2 is larger (at least in the first unwinding stage) and requires a drag torque, which is greater than the torque that is enough to keep the almost empty spool in the second unwinding position P3 in rotation.
[0043] In the illustrated embodiment, the endless belts that form the flexible endless element 33 are guided around rollers 35, 36, 37, 38, 39, 40, 41. As for the unwinding member 23, also for the endless flexible element 33 the guide or return rollers can each consist of a plurality of coaxial rollers or pulleys. From now on, for the sake of brevity, reference will always be made to guide or return rollers. At least one of the guide rollers is motorized, for example, the guide roller 40 can be motorized. The roller motor 40 is schematically indicated with 42 (see specifically Fig. 7). In the illustrated embodiment all rollers 35-41 are supported with shafts, which are stationary with respect to frame 3, with the exception of rollers 37 and 35.
[0044] In fact, the roller 37 or each roller 37 is supported by a movable arm 43, or by a pair of movable arms 43 articulated around a CC axis to a fixed part of the load-bearing structure 3. One actuator 45, for example, a piston - cylinder actuator, is used to keep the tension of the endless flexible element approximately constant, transmitting a controlled articulation movement according to the double arrow f43 of the articulation arm 43.
[0045] Vice versa, the guide roller 35 is supported by an articulation arm 47 articulated to a fixed structure around a D-D geometry axis. The pivot element according to the double arrow f47 of the arm 47 is transmitted by an actuator, for example, a piston-cylinder actuator 49 in order to modify the position of the guide roller 35 as a function of the step of the unwinding cycle , as will be described below with reference to the sequence of Figs. 1 to 6.
[0046] Between the first unwinding position P2 and the second unwinding position P3 a pair of guides 51 extends, which is carried by structure 3 and along which a transfer member is guided to transfer the spools. In the illustrated example the transfer member comprises a pair of opposing carriages 53, movable along the two side members of the unwinder (see also Fig. 7). The movement of the carriages 53 according to the double arrow f53 along the guides 51 can be transmitted, for example, by an electric motor (not shown) on each carriage 53, which rotates a pinion that meshes with a respective rack (none of which is shown in the drawing, for the sake of simplicity), which extends along one, the other or both guides 51, or in another suitable way. In other embodiments, a single fixed motor, connected to the two cars 53 by means of guided chains along a path that accompanies the guides 51, can be provided.
[0047] The guides 51 extend beyond the second unwinding position P3 forming a downward curve and continuing to form a downward section 51 A, which ends in an unloading position P4. In the unloading position P4 a pair of conveyors 57 are provided to receive and remove the empty rods from the spools coming from the second unwinding position P3.
[0048] The structure of the cars 53 is shown in greater detail in Fig. 1A, which illustrates an enlargement of one of the two cars, limited to its main elements.
[0049] In some embodiments, each carriage 53 has a locking element 59 operated by an actuator 61, for example, a piston-cylinder actuator, to lock on each carriage 53 the respective end of a reel rod B1 almost empty for transfer it from the first unwinding position P2 to the second unwinding position P3 and from this to the unloading position P4, as will be described in more detail hereinafter. In practice, the locking element 59 is double, one on each carriage 53, to couple the two opposite ends of the rod AS of the spool. Each locking member 59 is provided with a crazy wheel 59R. The respective car 53 is in turn provided with two crazy wheels 53R. The wheels 53R and 59R are arranged in such a way that, when the end of the AS winding rod is coupled with the respective carriage 53, it is trapped between the wheels 53R, 53R, 59R and can rotate, for the purposes here described, around its geometric axis.
[0050] In the illustrated embodiment, with the second unwinding position P3 a cutting member 65 is associated, comprising, for example, a transverse blade 66 supported by articulation arms 67 which are operated to move according to the double arrow f67 by an actuator, not shown, for example, a piston-cylinder actuator or similar.
[0051] The path of sheet material N1 being unwound from the reel B1 located in the first unwinding position P2 is defined by the endless flexible element 33 of the unwinding member 31, as well as by a guide roller 71, located further lower than the geometric axis of articulation AA of the articulation arms 7. The path of the sheet material N1 then extends from roll 71 down to a set of three guide rollers 72, 73 and 74, in substance defining the exit of the unwinder . One or more of these rollers can be mounted in such a way as to translate with respect to the others to detect fluctuations in the tension of the material in sheet N1 by means of an encoder, while the sheet material is unwound according to the arrow fN in the direction of a Conversion station downstream of the unwinder 1, not shown, for example, a recording unit, a rewinder or the like. In other embodiments, a load cell can be provided which detects the reaction forces on the bearings of a guide roller of sheet material N. In general, whatever the system for detecting a fluctuation in the tension of sheet material N , a signal generated by the detection system can be used to control the unwinding speed, in order to keep the unwinding voltage at the required value.
[0052] The guide roller 71 forms part of a splicing device 81, which comprises, in addition to the aforementioned guide roller 71, a series of connecting wheels of layers 83. The latter cooperate with the surface of the guide roller 71 when the tail end of sheet material N1 coming from the reel B1 being unwound must be spliced with the head end of sheet material N2 wound on the reel B2 waiting.
[0053] As can be seen in the drawing, the first unwinding position P2 is located between the splicing device 81 and the second unwinding position P3 and the endless flexible element 33 of the second unwinding member 31 extends from the splicing device 81 to the second unwinding position P3.
[0054] The operation of the unwinder 1 described above is clear from the structure as illustrated above. Figs. 1 to 6 show in detail a sequence of operation, including the step of replacing an empty spool B1 with a new standby spool B2.
[0055] More specifically, in Fig. 1 the spool B1 in an intermediate stage of its unwinding cycle, is rotating according to the arrow fB1 (in the counterclockwise direction in the drawing) to supply the material in sheet N1 according to the fN arrow for the downstream station, not shown. Reel B2 is in standby position P1. Advantageously, this was disposed with the free head end NL2 partially unwound in a predetermined position.
[0056] In this step the spool B1 is kept in rotation (arrow fB1) by the second unwinding member 31 and more specifically by the flexible endless element 33 which moves according to the arrow f33 by means of the drive system associated with the roller guide 40, for example. The guide roller with the movable geometry axis 37 can be moved gradually to keep the endless flexible element 33 in tension as the diameter of the spool B1 decreases as a result of the unwinding of the material on sheet N1.
[0057] In Fig. 2 the spool B1 located in the first unwinding position P2 is almost empty and must be replaced by the new spool B2 located in the standby position P1. In Fig. 2 it can also be seen that the first unwinding member 13 has already been moved against the second reel B2 before starting the lowering movement of the articulation arms 7. Thus, although the first unwinding member 13 is stationary, it acts as a brake.
[0058] To transfer the spool B1 from the first unwinding position P2 to the second unwinding position P3 the carriages 53 are moved along the guides 51, until they are against the spool winding rod B1 in the first unwinding position P2. By means of the locking member 59 provided on each carriage 53, the ends of the winding rod AS of the reel B1, projecting from the reel B1, are coupled with the carriages 53.
[0059] Furthermore, the guide roller 35 is lifted by means of an upward articulation of the pair of arms 47 by means of the piston actuators - cylinder 49, until the guide roller 35 is taken to a higher position than the guides 51, on which the carriages 53 move. This changes the path of the endless flexible element 33, the upper branch from which it moves upwards. In reality, the lifting movement of the guide roller 53 can be gradual and used, if necessary, in combination with the aforementioned gradual movement of the guide roller 37, to compensate for the decrease in diameter of the spool B1 during the unwinding of the material in sheet N1.
[0060] Fig. 3 shows the subsequent step, in which the cars 53 that form the transfer member transferred the spool B1 from the first unwinding position P2 to the second unwinding position P3. To perform this movement, the counterpoints 27 are first released (arrow f27, Fig. 7) from the winding rod AS of the spool B1, after said rod has been coupled with the carriages 53 that form the transfer member of the spool between the positions P2, P3 and P4. Due to the crazy wheels 53R, 59R of the two cars 53, the reel B1 can continue to rotate around its geometric axis to unwind the material in sheet N.
[0061] Due to the lifting of the guide roller 35 in the position of Fig. 3, the endless flexible element 33 of the second unwinding member 31 remains in contact with the spool B1 and extends at a certain angle around it also when said spool B1 is located in the second unwinding position P3.
[0062] In this way, the first spool B1 is kept in constant rotation while it is in the first unwinding P2, during the transfer from the first unwinding position P2 to the second unwinding position P3, and also when it is located in the second position unwinding P3. The rotation speed and, consequently, the unwinding speed of the material in sheet N1 can be decreased before starting the transfer or during the transfer to the second unwinding position P3, or when the first spool B1 is located in the second unwinding position P3.
[0063] Once the spool B1 has been moved away from the first unwinding position P2, the lowering motion of the second spool B2 from the standby position P1 (Fig. 1) in the direction of the first unwinding position P2 can begin. This movement is achieved by articulating the arms 7 by means of the actuators 9 as shown in Fig. 3. The rotation or geometric axis of articulation B-B of the arms 23 of the first unwinding member 13 follows the articulation movement of the articulation arms 7.
[0064] When the cycle to replace the first spool B1 with the second spool B2 must be started, the first unwinding member 13 is put in rotation and gradually accelerated, to start the rotation of the second spool B2 in the unwinding direction. The endless flexible element 15 of the first unwinding member 13 follows the lowering movement of the reel B2 being constricted with its geometric axis B-B on the articulation arms 7 by means of extensions 7X and the torsion bar 7T. Therefore, the endless flexible element 15 of the first unwinding member 13 remains in contact with the second reel B2 while the latter is lowered towards the first unwinding position P2. The acceleration of the rotary movement of the second spool B2 is performed in a synchronized mode with the lowering movement of the spool B2.
[0065] In this step, due to the beginning of rotation (in the counterclockwise direction in the figure) according to the arrow fB2 of the second spool B2 caused by the first unwinding member 13, the head or end portion NL2 of the sheet material N2 starts to be unwound and rests on the first sheet material N1, which continues to be fed according to the arrow fN as a result of rotation of the spool B1, which is located in the second unwinding position P3 and is maintained in rotation by the second clearing member 31.
[0066] As can be seen in Fig. 3, in this step the head portion of sheet material N2 being unwound from carriage B2 advances supported by the first sheet material N1 together with the last in the direction of the splicing device 81 .
[0067] Fig. 4 shows the subsequent step, in which the second spool B2, continuing to be lowered and kept in rotation by the first unwinding member 13, comes into contact with the sheet material N1 and begins to press against the member unwinding 31 and more precisely against the upper branch of the endless flexible element 33. The head of sheet material N2 being unwound from spool B2 is spliced by splicing device 81 at the end of sheet material N1, which continues advancing as a result of the movement of the endless flexible element 33. The cutting member 65 cut the sheet material N1 coming from the spool B1, generating the tail C1 of the sheet material N1 and thus allowing the spool B1 to be moved away in the direction of the unloading position P4. The roller 35 is lowered to move the endless flexible element 33 away from the empty spool B1 and thus stop the rotation effect of the empty spool B1, so that the sheet material wound on it is no longer supplied. Furthermore, lowering the spool 35 allows the path to be released to move the spool B1 away from the second unwinding position P3 in the direction of the unloading position P4.
[0068] Fig. 5 shows the subsequent step, in which the carriages 53 transferred the first empty spool B1 to the unloading position P4 while the new spool B2 was released in the first unwinding position P2. The second spool B2 is released in the first unwinding position P2 as follows. The geometrical axis of the winding rod AS of the reel B2 is aligned with the counterpoints 27 by means of the movement of the articulation arms 7. Once this position has been reached, the counterpoints 27 are moved towards each other (arrow f27) and couple inside the hollow ends of the AS winding rod. To facilitate this picking operation, the counterpoints and corresponding cavities of the winding rod AS preferably have a truncated cone-shaped portion. Once the second spool B2 has been coupled with the counterpoints 27, the ends 7A of the articulation arms 7 are rotated through the actuators 11 to release the rod AS and the spool B2 and allow the arms 7 to be raised again in the direction of the standby position P1. Before transferring the reel B2 to the counterpoints 27, the reel B2 can in any case rotate and, therefore, supply the material in sheet N2, due to the wheels 7R provided inside the seats 7B formed by the arms 7.
[0069] The first unwinding member 13 decoupled from the second spool B2 which continues to rotate as a result of the movement of the endless flexible element 33 of the second unwinding member 31 in order to maintain continuous feed of the material in sheet N2, the which replaces the N1 sheet material.
[0070] After finally reaching the second unwinding position P2 and being coupled by the counterpoints 27, the reel B2 can be accelerated to pass from a reduced rotation speed, in which the step of replacing the spools B1 and B2 was performed, for the normal operating speed. If the normal operating speed is specifically low, it may also be possible to operate at normal operating speed, also during the change or replacement of spools.
[0071] In any case, even if the speed at which the spool replacement is performed is lower than the normal operating speed, it is still possible to feed the line downstream of the unwinder 1 continuously, if necessary by temporarily decreasing the speed of the unwinder. line.
[0072] Alternatively, an accumulator, for example, a garland accumulator, can be provided between the unwinder 1 and the downstream line. With respect to machines that require a complete stop of the unwinder during the replacement of the empty spool with the new spool, an advantage is in any case obtained, since any required accumulator can be of smaller dimensions. The presence of an accumulator could also be used in order to perform the exchange of the reel B1 by the reel B2 at a reduced speed, while maintaining the speed of feeding the material in the sheet downstream of the accumulator at a higher speed, equal to the speed of normal operation, or an intermediate speed between the normal operating speed and the unwinding speed of the spools B1, B2 during the exchange step.
[0073] Fig. 6 shows the subsequent step, in which the empty spool B1 was moved away from the unloading position P4 and the carriages 53 that form the transfer member returned to their position along the approximately horizontal section of the guides 51 The arms 7 were returned to the position to receive, from a crane that moves suspended, not shown, a new spool to be kept in the waiting position P1, while the spool B2, which is kept in rotation and unwound by the second unwinding member 31, is located in the first unwinding position P2.
[0074] Figs. 8, 9 and 10 show steps equivalent to those of Figs. 2, 3, and 4 described above in the case in which the spools B1 and B2 must be unwound with a rotation in an opposite direction to that shown in the sequence of Figs. 1 to 6, rotating the unwinding members 13 and 31 in opposite directions. The unwinder structure is identical. The unwinding steps are substantially the same, with appropriate adaptations, including the fact that the contact between the reel B2 and the endless flexible element 33 happens after the tail of the material in sheet N1 has passed downstream of the contact point of the reel B2 with said endless flexible element 33.
[0075] Figs. 8, 9 and 10 show that the unwinding device is also capable of handling these spools with a sequence substantially equivalent to that previously described. Therefore, the unwinder 1 has the additional advantage, with respect to the unwinders of the prior art, of being able to unwind the spools without distinction in one direction or the other, simply by reversing the rotation movement of the unwinding members 13e31.
[0076] It is understood that the drawing shows only one example, provided merely as a practical demonstration of the invention, which can vary in its forms and dispositions, without however departing from the scope of the concept underlying the invention. Any reference numbers in the attached claims are provided to facilitate the reading of the claims with reference to the description and drawings, and do not limit the scope of protection represented by the claims.

权利要求:
Claims (24)
[0001]
1. Uncoiler to unwind spools (B1, B2) of sheet material (N1, N2) comprising: a first unwinding position (P2), in which a first spool (B1) is positioned for at least part of a cycle unwinding; a second unwinding position (P3), to which said first spool is transferred when it must be replaced by a second spool (B2); a hold position (P1), in which said second spool (B2) is held on hold; a first unwinding member (13) associated with said holding position (P1), arranged and controlled to start the rotation of said second spool (B2) when the first spool (B1) is to be replaced by the second spool (B2); characterized by the fact that a second unwinding member (31), which comprises at least one flexible endless element (33), extends from the first unwinding position (P2) to the second unwinding position (P3), and is arranged and controlled so that the first spool is kept in contact with said second unwinding member and in rotation by means of said second unwinding member (31) in said first unwinding position (P2), in said second unwinding position ( P3) and while it is being transferred from said first unwinding position (P2) to said second unwinding position (P3).
[0002]
2. Unwinder, according to claim 1, characterized by the fact that said waiting position (P1) is above said first unwinding position (P2).
[0003]
3. Unwinder, according to claim 1 or 2, characterized by the fact that said first unwinding position (P2) is located between the second unwinding position (P3) and an exit of the material in the unwinder's sheet.
[0004]
4. Unwinder, according to claim 1 or 2 or 3, characterized by the fact that said second unwinding member (31) is arranged and controlled to modify the path of the endless flexible element (33) as a function of the position of the first spool (B1) with respect to the first unwinding position (P2) and the second unwinding position (P3).
[0005]
5. Unwinder according to claim 4, characterized in that said flexible endless element (33) is guided around a plurality of guide rollers (35-41), at least one (35) of which it has a movable geometric axis, to modify the path of the endless flexible element (33), and at least one of which (40) is motorized.
[0006]
6. Unwinder, according to claim 5, characterized by the fact that at least two of said guide rollers (35-41) have a movable geometric axis, to modify the path of the endless flexible element (33).
[0007]
7. Unwinder, according to claim 5 or 6, characterized by the fact that said at least one roller (35) with the movable axis is arranged and controlled so as to move from a lower position to a higher position in said second unwinding position.
[0008]
8. Unwinder, according to one or more of the preceding claims, characterized by the fact that said endless flexible element (33) extends from said first unwinding position (P2) to said second unwinding position (P3 ) and has an active branch which moves from said first unwinding position in the direction of said second unwinding position or vice versa according to the direction of rotation of the first spool (B1).
[0009]
9. Unwinder, according to one or more of the preceding claims, characterized by the fact that said flexible endless element (33) extends between the second unwinding position (P3) and a splicing device (81) to amend the sheet material (N1) unwound from the first spool (B1) in sheet material (N2) unwound from the second spool (B2), the first unwinding position (P2) being located between the second unwinding position (P3) and said splice device (81).
[0010]
10. Unwinder, according to one or more of the preceding claims, characterized by the fact that in said first unwinding position (P2), controlled counterpoints (27) are provided and arranged to axially couple said first spool and release the first spool to allow its movement in the direction of the second unwinding position (P3).
[0011]
11. Unwinder, according to one or more of the preceding claims, characterized by the fact that it comprises a movable transfer member (53) between the first unwinding position (P2) and the second unwinding position (P3), to transfer the first spool (B1) from the first unwinding position (P2) to the second unwinding position (P3).
[0012]
12. Unwinder, according to claim 11, characterized in that said transfer member (53) moves from the second unwinding position (P3) to an unloading position (P4) to release the first spool (B3) and its unwinding end.
[0013]
13. Uncoiler, according to claims 7 and 12, characterized by the fact that said at least one guide roller with movable geometric axis (35) is controlled and arranged to be lowered from the upper position to the lower position at the end of the unwinding on said first spool, allowing the transfer member (53) to pass from the second unwinding position (P3) to the unloading position (P4).
[0014]
14. Unwinder, according to one or more of the preceding claims, characterized by the fact that associated with said second unwinding position (P3) is a cutting member (65) controlled and arranged to cut the sheet material of said first spool (B1) at the end of the unwinding.
[0015]
15. Unwinder, according to one or more of the preceding claims, characterized by the fact that said first unwinding member (13) is a peripheral unwinding member.
[0016]
16. Unwinder, according to claim 15, characterized in that said first unwinding member (13) comprises a flexible endless element (15) guided around at least two rollers (17, 19), at least one of which is motorized.
[0017]
17. Unwinder, according to claim 15 or 16, characterized by the fact that said first unwinding member (13) is supported mobile to accompany the second spool (B2) when said second spool (B2) is transferred from the position (P1) in the direction of said first unwinding position (P2).
[0018]
18. Unwinder, according to claim 17, characterized by the fact that said first unwinding member (13) is supported by arms (23) that articulate around a geometric axis substantially parallel to the geometric axis of the second spool (B2 ) and the first spool (B1).
[0019]
19. Unwinder, according to one or more of the preceding claims, characterized by the fact that it comprises a transfer device (7, 7A, 9) arranged and controlled to transfer the second spool (B2) from the standby position ( P1) for the first unwinding position (P2).
[0020]
20. Unwinder, according to claim 19, characterized by the fact that said transfer device (7, 7A, 9) comprises arms (7) that articulate around a geometric axis substantially parallel to the second spool (B2) in the said waiting position (P1).
[0021]
21. Unwinder, according to claim 19 or 20, characterized by the fact that said first unwinding member (13) is constrained to said transfer device (7, 7A, 9) to accompany the movement of the second spool (B2 ) from the waiting position (P1) to the first unwinding position (P2).
[0022]
22. Method for unwinding the spools of sheet material and making a seam between a tail of a first sheet material (N1) uncoiled from a first reel (B1) and a head (NL2) of a second sheet material (N2) uncoiled a second spool (B2) without stopping the feeding of sheet material, characterized by the fact that it comprises the steps of: positioning said first spool (B1) in a first unwinding position (P2); positioning the second spool (B2) in a waiting position (P1), in which a first unwinding member (13) is arranged; unwinding the first sheet material (N1) from said first spool by means of a second unwinding member (33); before finishing the unwinding of the first spool (B1), transfer said first spool from the first unwinding position (P2) towards a second unwinding position (P2), keeping said first spool (B1) in rotation by means of said second unwinding member (31) and continuing to unwind said first sheet material (N1); put the second spool (B2) in rotation and transfer the second spool (B2) from the hold position (P1) towards the first unwinding position (P2) while the second sheet material (N2) starts to unwind from the second spool ( B2); splice the head of the second sheet material (N2) into the tail of the first sheet material (N1).
[0023]
23. Method, according to claim 22, characterized by the fact that the head of the second sheet material (N2) is placed over the first sheet material (N1), while said first sheet material (N1) continues the unwinding of the first spool (B1) and said second sheet material (N2) is unwinding of the second spool (B2), and in which said head of the second sheet material (N2) advances supporting the first sheet material ( N1) towards a splice device (81).
[0024]
24. Method according to claim 23, characterized in that said first sheet material (N1) is cut when the head of the second sheet material (N2) has been inserted in said splicing device (81) together with the first sheet material (N1).

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同族专利:

公开号 | 公开日

US9670020B2|2017-06-06|

CN104080719A|2014-10-01|

CN104080719B|2016-11-23|

IN2014CN03859A|2015-10-16|

CA2856125C|2019-08-27|

EP2782857A1|2014-10-01|

ES2618496T3|2017-06-21|

ITFI20110253A1|2013-05-24|

CA2856125A1|2013-05-30|

MX2014006062A|2015-06-04|

BR112014012394A2|2017-05-30|

RU2605344C2|2016-12-20|

KR20140102191A|2014-08-21|

RU2014125283A|2015-12-27|

JP6071151B2|2017-02-01|

JP2014533643A|2014-12-15|

MX349509B|2017-08-02|

KR101945077B1|2019-02-01|

EP2782857B1|2017-01-04|

US20140326822A1|2014-11-06|

WO2013076011A1|2013-05-30|

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法律状态:
2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

2019-09-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

2020-06-02| B09A| Decision: intention to grant|

2020-11-03| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 15/11/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

申请号 | 申请日 | 专利标题

IT000253A|ITFI20110253A1|2011-11-23|2011-11-23|"UNWINDER FOR COILS AND RUNNING METHOD"|

ITFI2011A000253|2011-11-23|

PCT/EP2012/072793|WO2013076011A1|2011-11-23|2012-11-15|Reel unwinder and unwinding method|

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