EP2523882A1 - Unreeling assembly, particularly for labeling devices - Google Patents

Unreeling assembly, particularly for labeling devices

Info

Publication number
EP2523882A1
EP2523882A1 EP20110700915 EP11700915A EP2523882A1 EP 2523882 A1 EP2523882 A1 EP 2523882A1 EP 20110700915 EP20110700915 EP 20110700915 EP 11700915 A EP11700915 A EP 11700915A EP 2523882 A1 EP2523882 A1 EP 2523882A1
Authority
EP
European Patent Office
Prior art keywords
reel
continuous film
unreeled
tensioning element
tensioning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20110700915
Other languages
German (de)
French (fr)
Other versions
EP2523882B1 (en
Inventor
Maurizio Pedercini
Ivan Di Pinto
Alessandro Gazzini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sacmi Verona SpA
Original Assignee
Sacmi Verona SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sacmi Verona SpA filed Critical Sacmi Verona SpA
Publication of EP2523882A1 publication Critical patent/EP2523882A1/en
Application granted granted Critical
Publication of EP2523882B1 publication Critical patent/EP2523882B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/048—Registering, tensioning, smoothing or guiding webs longitudinally by positively actuated movable bars or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/182—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in unwinding mechanisms or in connection with unwinding operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B65H2513/11—Speed angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/20—Actuating means angular
    • B65H2555/24—Servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/75—Labelling machines

Definitions

  • the present invention relates to an unreeling assembly, particularly for labeling devices.
  • the feeding means have, generally, an unreeling assembly, which is typically comprised of two reels of continuous film which are supported by a respective reel support; from one of the two reels, the continuous film is unreeled by means of a traction drum, and is then cut by a cutting assembly, arranged downstream of the unreeling assembly, to be then sent to the applicator elements.
  • an unreeling assembly which is typically comprised of two reels of continuous film which are supported by a respective reel support; from one of the two reels, the continuous film is unreeled by means of a traction drum, and is then cut by a cutting assembly, arranged downstream of the unreeling assembly, to be then sent to the applicator elements.
  • the "working" reel i.e. the reel from which the continuous film is unreeled
  • the traction drum a plurality of return rolls are normally interposed, as well as a tensioning dandy roll.
  • the unreeling assembly in addition to feeding the continuous film to the cutting assembly to be cut, also has the function of correctly tensioning the film, longitudinally, by means of the action of the tensioning dandy roll.
  • the tensioning dandy roll cooperates with the reel support, which can be governed by a braking device or by a servomotor.
  • the reel support which can be governed by a braking device or by a servomotor.
  • a first partial solution adopted nowadays to eliminate this drawback is to combine the braking device with a pneumatic motor, which also acts on the reel support and makes it possible to minimize the tension of the film being unreeled and therefore its longitudinal extension, predominantly during the initial phase of unreeling the reel.
  • a second type of unreeling assemblies has, instead of the pneumatic motor and the braking devices, a second servomotor which is designed to assist the servomotor associated with the traction drum to correctly handle the film being unreeled from the reel, both during the initial phase of unreeling (thus eliminating the stress on the film which is due to the effect of inertia of the rotating elements, reel and reel support), and during the work phase.
  • the control device when a displacement of the tensioning dandy roll from the set position is detected, the control device operates on the servomotor which is associated with the reel being unreeled to vary the linear speed of the unreeled film so as to return the tensioning dandy roll to the set position.
  • a drawback of this solution is the lack of control over the position of the tensioning dandy roll over time, with the consequence of not succeeding in optimizing the performance levels of the unreeling assembly during the work phase and, especially, during the step of connecting the end portion of the film being unreeled from the reel which is about to be depleted and the free end portion of the film which is wound around the other reel.
  • the known unreeling assemblies reduce the speed of the traction drum with a consequent reduction in the productivity of the labeling device that is arranged downstream of the unreeling assembly. Disclosure of the Invention
  • the aim of the present invention is to solve the problems and overcome the drawbacks mentioned above, by providing an unreeling assembly, particularly for labeling devices, that makes it possible to keep the speed of the traction drum high even during the connection step.
  • an object of the present invention is to develop an unreeling assembly, particularly for labeling devices, which makes it possible to reduce the stress to which the film is subjected, both during the work phase and during the connection step, with the same geometry of the unreeling assembly.
  • a further object of the invention is to provide an unreeling assembly, particularly for labeling devices, which is capable of increasing the range of grammages of the films to be processed.
  • an unreeling assembly particularly for labeling devices, comprising a supporting frame for at least two reels of continuous film which are supported by a respective reel support, which can be actuated to rotate about an unreeling axis of the reel by a respective servomotor, and a motorized traction drum, which is designed to unreel said continuous film from one of said at least two reels of continuous film, between the reel of film being unreeled and said traction drum there being at least one element for tensioning said continuous film, said tensioning element being movable, with respect to said supporting frame, along a respective movement path, characterized in that it comprises control means which operate on the servomotor and are adapted to control the position of said tensioning element along the respective movement path.
  • control means are adapted to move, on command, said tensioning element between at least one first working position, in which said tensioning element is adapted to apply a preset tension to said continuous film being unreeled, and at least one second accumulation position for increasing the length of the continuous film that lies between said reel being unreeled and said traction drum with respect to the length of said continuous film, between said reel being unreeled and said traction drum, with said tensioning element in said first working condition.
  • Figure 1 is a schematic view of an unreeling assembly
  • Figure la is an enlarged view of a portion of the joining station shown in Figure 1 ;
  • Figure 2 is a graph showing the typical trend of the tension to which a continuous film being unreeled from a reel is subjected as a function of the angle of the tensioning dandy roll;
  • Figure 3 shows a possible trend, as a function of time, of the position of a tensioning dandy roll of an unreeling assembly according to the invention in proximity to the connection step;
  • Figure 3 shows a possible variation, again as a function of time, of the trend of the position of a tensioning dandy roll of an unreeling assembly according to the invention in proximity to the connection step;
  • Figure 4 shows the trend, as a function of time, of the position of a tensioning dandy roll of a known unreeling assembly in proximity to the connection step.
  • the present invention relates to an unreeling assembly, generally indicated with the reference numeral 1, particularly for labeling devices.
  • the unreeling assembly 1 comprises, in particular, a supporting frame 2 for at least two reels 3 of continuous film 10 which will be cut, typically by a cutting assembly, which is arranged downstream of the unreeling assembly 1 , to make the labels.
  • Each reel 3 is supported by a respective reel support 4, which is rotatably mounted on the supporting frame 2 and can be actuated to rotate about a respective unreeling axis 100 of the reel 3 by a respective servomotor (13a, 13b).
  • the unreeling assembly 1 is moreover provided with a traction drum 5, which is motorized for example by an actuation motor 9 and is designed to unreel the continuous film 10 from one of the two reels 3 (hereinafter 3 a shall indicate the reel from which the continuous film 10 is being unreeled).
  • a traction drum 5 which is motorized for example by an actuation motor 9 and is designed to unreel the continuous film 10 from one of the two reels 3 (hereinafter 3 a shall indicate the reel from which the continuous film 10 is being unreeled).
  • At least one tensioning element 6 is provided between the reel 3a and the traction drum 5, which tensioning element is movable, with respect to the supporting frame 2, along a respective movement path that is schematized in Figure 1 with the arrow marked with the reference numeral 200.
  • the unreeling assembly 1 comprises control means 11 , which operate on the servomotor 13a that is associated with the reel being unreeled 3a, to control the position of the tensioning element 6 along the respective movement path 200.
  • control means 11 are, in particular, adapted to move, on command and, advantageously, under defined operative conditions which shall be described in more detail hereinafter, the tensioning element 6 between at least one first working position, in which the tensioning element 6 is adapted to apply a preset tension to the continuous film 10 being unreeled, and at least one second accumulation position.
  • the length of the continuous film 10 that lies between the reel 3 a being unreeled and the traction drum 5 is greater than the length of the continuous film 10 between the reel 3a being unreeled and the traction drum 5 when the tensioning element 6 is in the first working position.
  • control means 11 are capable, by operating on the servomotor (and specifically on the servomotor 13b that is associated with the reel 3b), of bringing, in a controlled manner and according to a rule of motion which can be preset (see for example the trend of ⁇ in the time interval U in Figures 3 and 3a), the tensioning element 6 from the post-connection position (indicated with ⁇ 2 in Figures 3 and 3a), and more generally from any position that is different from the first working position (po, to the first working position ⁇ 0 by precisely controlling (following the aforementioned rule of motion) its movement over time and, consequently, controlling the tension to which the continuous film 10 is subjected during the entire connection step.
  • a rule of motion which can be preset (see for example the trend of ⁇ in the time interval U in Figures 3 and 3a), the tensioning element 6 from the post-connection position (indicated with ⁇ 2 in Figures 3 and 3a), and more generally from any position that is different from the first working position (po, to
  • the supporting frame 2 supports, between the reel 3a of continuous film 10 being unreeled and the traction drum 5, a plurality of return rolls 7 which include some return rolls of the tensioning device 7a,
  • a joining station 8 which is designed to provide the connection between the end portion of the continuous film 10 being unreeled from the reel 3a about to be depleted and the end portion 3c of the film supported by the other reel 3b.
  • the tensioning element 6 can be constituted by what is called a tensioning dandy roll 6a which is supported by the supporting frame 2 so that it can rotate about a respective pivoting axis 101.
  • the position of the tensioning element 6 with respect to the supporting frame 2 is defined by the angular shift ( ⁇ ) of the tensioning dandy roll 6a about the pivoting axis 101 with respect to a predetermined base position,
  • control means 1 1 comprise means for commanding the servomotor (13a, 13b) that is associated with the two reels (3a, 3b).
  • the first working position of the tensioning element 6 substantially corresponds to the minimum tension position (designated by (po in the chart shown in Figure 2) so as to minimize the longitudinal stress to which the film being unreeled is subjected and increase the stability of operation of the unreeling assembly 1.
  • control means 11 are adapted to bring the tensioning element 6 from the first working position to the second accumulation position by means of a variation in the angular velocity (to) of the servomotor 13a that is associated with the reel 3a being unreeled.
  • control means 11 are capable of setting, substantially instantaneously, the speed (co) of the servomotor 13a in such a way that the linear velocity of the continuous film 10 being unreeled from the reel 3a (i.e. upstream of the tensioning dandy roll 6a) is greater than the linear velocity of the film on the traction drum 5 (i.e. downstream of the tensioning dandy roll 6a).
  • the control means 11 are further capable of operating on the servomotor 13a to exactly control (as can be seen for example in the diagram shown in Figure 3) the angular position of the tensioning dandy roll 6a during the entire connection step and, therefore, both to accumulate the film and to return the tensioning dandy roll 6a from the post-connection angular position ⁇ 2 to the first working position ⁇ 0 according to a rule of motion which can be preset.
  • control means 11 are able to operate on the servomotors (13a, 13b) which are associated with the two reels (3a and 3b) to precisely define the movement of the tensioning dandy roll 6a (and more generally of the tensioning element 6) as a function of time, and according to a rule of motion which can be preset, along the respective movement path 200, unlike what occurs in the unreeling assemblies used today, which operate on the angular velocity of the servomotor or on the braking device only if a shift of the tensioning dandy roll 6a from the working position is detected and, especially, according to a trend that is completely non- controlled, as shown in the diagram in Figure 4.
  • the joining station 8 is capable of making an optimal connection only at reduced linear velocities of the film upstream of the tensioning dandy roll
  • the first working position ⁇ 0 of the tensioning dandy roll 6a is set, advantageously, on the basis of the geometry of the unreeling assembly 1 (position of the return rolls of the tensioning device 7a and of the tensioning dandy roll 6a) so as to minimize, during the operation of the unreeling assembly 1, the tensions to which the continuous film 10 being unreeled is subjected.
  • the control means 11 which are for example constituted by a processor or by a PLC, operate on the servomotor 13a that is associated with the reel support 4 on which the reel 3a that is about to be depleted is wound, so as to "force" the movement of the tensioning dandy roll 6a towards the second accumulation position (indicated with (pi in the diagrams in Figure 3 and Figure 3a) according to a rule of motion that can be preset.
  • control means 11 operate on the servomotor 13b so as to gradually return, again following a "rule of motion" which can be preset, the tensioning element 6 from the post-connection position (position indicated with cp2 in Figure 3 and in Figure 3 a) to the first working position ⁇ 0 .
  • the rules of motion used to command the movement of the tensioning dandy roll 6a (and, more generally, of the tensioning element 6) along the respective movement path 200 are, in particular, chosen so as to:
  • a) contain as far as possible the "stress" to which the continuous film 10 is subjected during the connection step; and/or b) limit the quantity of continuous film 10 that is subjected to the variation of tension and, therefore, potentially to be discarded; and/or
  • the rules of motion are to be considered a succession, as a function of time, of intermediate positions between the initial position (for example ⁇ p 0 or ⁇ 2 ) and the final position (for example ( i or, respectively, ⁇ ) that is desired to be reached.
  • control means 11 are adapted to generate an extremely high number of intermediate positions so that the "rules of motion" that are actually followed by the tensioning dandy roll 6a tend towards the preset "rules of motion", such as for example a fifth-order polynomial or a trapezoidal.
  • an unreeling assembly 1 by making it possible to perceptibly reduce the longitudinal stress on the film being unreeled, allows the use of continuous films (10) with low grammage and/or limited height and/or low quality.
  • control means 11 it is possible to preset several rules of motion so as to make it possible to optimize, for example, the accumulation of film before the connection step or to limit the stress during the passage from the post-connection position to the first working position.

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Abstract

The present invention relates to an unreeling assembly (1), particularly for labeling devices, comprising a supporting frame (2) for at least two reels (3) of continuous film (10) which are supported by a respective reel support (4), which can be actuated to rotate about an unreeling axis (100) of the reel (3) by a respective servomotor (13a, 13b), and a motorized traction drum (5), which is designed to unreel the continuous film (10) from one of the at least two reels (3) of continuous film (10), between the reel (3a) of film being unreeled and the traction drum (5) there being at least one element (6) for tensioning the continuous film (10), the tensioning element (6) being movable, with respect to the supporting frame (2), along a respective movement path (200), characterized in that it comprises control means (11) which operate on the servomotor (13a, 13b) and are adapted to control the position of the tensioning element (6) along the respective movement path (200).

Description

UNREELING ASSEMBLY, PARTICULARLY FOR LABELING DEVICES Technical field
The present invention relates to an unreeling assembly, particularly for labeling devices.
Background Art
Currently, some types of labeling devices for containers such as bottles or jars have means for feeding bands of film to applicator elements, of various types, which are designed to apply the labels on the containers.
The feeding means have, generally, an unreeling assembly, which is typically comprised of two reels of continuous film which are supported by a respective reel support; from one of the two reels, the continuous film is unreeled by means of a traction drum, and is then cut by a cutting assembly, arranged downstream of the unreeling assembly, to be then sent to the applicator elements.
Between the "working" reel, i.e. the reel from which the continuous film is unreeled, and the traction drum a plurality of return rolls are normally interposed, as well as a tensioning dandy roll.
The unreeling assembly, in addition to feeding the continuous film to the cutting assembly to be cut, also has the function of correctly tensioning the film, longitudinally, by means of the action of the tensioning dandy roll.
In order to keep the film unreeled from the working reel correctly tensioned, the tensioning dandy roll cooperates with the reel support, which can be governed by a braking device or by a servomotor. Although the unreeling assemblies thus structured are widely used, they are not without drawbacks.
In particular, in applications in which plastic films are used, significant limitations arise when particularly extensible continuous films are unreeled, as is the case with films of reduced thickness, low density and/ or limited height.
A first partial solution adopted nowadays to eliminate this drawback is to combine the braking device with a pneumatic motor, which also acts on the reel support and makes it possible to minimize the tension of the film being unreeled and therefore its longitudinal extension, predominantly during the initial phase of unreeling the reel.
However, using a pneumatic motor has some drawbacks including notably the consumption of compressed air, noise, and greater wear of the braking devices.
A second type of unreeling assemblies has, instead of the pneumatic motor and the braking devices, a second servomotor which is designed to assist the servomotor associated with the traction drum to correctly handle the film being unreeled from the reel, both during the initial phase of unreeling (thus eliminating the stress on the film which is due to the effect of inertia of the rotating elements, reel and reel support), and during the work phase.
Basically, when a displacement of the tensioning dandy roll from the set position is detected, the control device operates on the servomotor which is associated with the reel being unreeled to vary the linear speed of the unreeled film so as to return the tensioning dandy roll to the set position.
A drawback of this solution is the lack of control over the position of the tensioning dandy roll over time, with the consequence of not succeeding in optimizing the performance levels of the unreeling assembly during the work phase and, especially, during the step of connecting the end portion of the film being unreeled from the reel which is about to be depleted and the free end portion of the film which is wound around the other reel.
In particular, in order to perform the connection adequately, and without subjecting the continuous film to excessive stress, the known unreeling assemblies reduce the speed of the traction drum with a consequent reduction in the productivity of the labeling device that is arranged downstream of the unreeling assembly. Disclosure of the Invention
The aim of the present invention is to solve the problems and overcome the drawbacks mentioned above, by providing an unreeling assembly, particularly for labeling devices, that makes it possible to keep the speed of the traction drum high even during the connection step.
Within this aim, an object of the present invention is to develop an unreeling assembly, particularly for labeling devices, which makes it possible to reduce the stress to which the film is subjected, both during the work phase and during the connection step, with the same geometry of the unreeling assembly.
A further object of the invention is to provide an unreeling assembly, particularly for labeling devices, which is capable of increasing the range of grammages of the films to be processed.
This aim, as well as these and other objects which will become more evident hereinafter, are achieved by an unreeling assembly, particularly for labeling devices, comprising a supporting frame for at least two reels of continuous film which are supported by a respective reel support, which can be actuated to rotate about an unreeling axis of the reel by a respective servomotor, and a motorized traction drum, which is designed to unreel said continuous film from one of said at least two reels of continuous film, between the reel of film being unreeled and said traction drum there being at least one element for tensioning said continuous film, said tensioning element being movable, with respect to said supporting frame, along a respective movement path, characterized in that it comprises control means which operate on the servomotor and are adapted to control the position of said tensioning element along the respective movement path.
Advantageously, the control means are adapted to move, on command, said tensioning element between at least one first working position, in which said tensioning element is adapted to apply a preset tension to said continuous film being unreeled, and at least one second accumulation position for increasing the length of the continuous film that lies between said reel being unreeled and said traction drum with respect to the length of said continuous film, between said reel being unreeled and said traction drum, with said tensioning element in said first working condition. Brief description of the drawings
Further characteristics and advantages of the invention will become better apparent from the following detailed description of some preferred, but not exclusive, embodiments of an unreeling assembly, particularly for labeling devices, according to the invention, illustrated by way of non- limiting example in the accompanying drawings, wherein:
Figure 1 is a schematic view of an unreeling assembly;
Figure la is an enlarged view of a portion of the joining station shown in Figure 1 ;
Figure 2 is a graph showing the typical trend of the tension to which a continuous film being unreeled from a reel is subjected as a function of the angle of the tensioning dandy roll;
Figure 3 shows a possible trend, as a function of time, of the position of a tensioning dandy roll of an unreeling assembly according to the invention in proximity to the connection step;
Figure 3 shows a possible variation, again as a function of time, of the trend of the position of a tensioning dandy roll of an unreeling assembly according to the invention in proximity to the connection step; and
Figure 4 shows the trend, as a function of time, of the position of a tensioning dandy roll of a known unreeling assembly in proximity to the connection step.
Ways of carrying out the Invention
In the embodiments that follow, individual characteristics shown in relation to specific examples may in reality be interchanged with other, different characteristics, existing in other embodiments.
Moreover, it should be noted that anything found to be already known during the patenting process is understood not to be claimed and to be the subject of a disclaimer.
With reference to the figures, the present invention relates to an unreeling assembly, generally indicated with the reference numeral 1, particularly for labeling devices.
The unreeling assembly 1 comprises, in particular, a supporting frame 2 for at least two reels 3 of continuous film 10 which will be cut, typically by a cutting assembly, which is arranged downstream of the unreeling assembly 1 , to make the labels.
Each reel 3 is supported by a respective reel support 4, which is rotatably mounted on the supporting frame 2 and can be actuated to rotate about a respective unreeling axis 100 of the reel 3 by a respective servomotor (13a, 13b).
The unreeling assembly 1 is moreover provided with a traction drum 5, which is motorized for example by an actuation motor 9 and is designed to unreel the continuous film 10 from one of the two reels 3 (hereinafter 3 a shall indicate the reel from which the continuous film 10 is being unreeled).
For keeping the tension of the continuous film 10 being unreeled from the reel 3 a constant, at least one tensioning element 6 is provided between the reel 3a and the traction drum 5, which tensioning element is movable, with respect to the supporting frame 2, along a respective movement path that is schematized in Figure 1 with the arrow marked with the reference numeral 200.
According to the present invention, the unreeling assembly 1 comprises control means 11 , which operate on the servomotor 13a that is associated with the reel being unreeled 3a, to control the position of the tensioning element 6 along the respective movement path 200.
These control means 11 are, in particular, adapted to move, on command and, advantageously, under defined operative conditions which shall be described in more detail hereinafter, the tensioning element 6 between at least one first working position, in which the tensioning element 6 is adapted to apply a preset tension to the continuous film 10 being unreeled, and at least one second accumulation position.
In this second accumulation position, the length of the continuous film 10 that lies between the reel 3 a being unreeled and the traction drum 5 is greater than the length of the continuous film 10 between the reel 3a being unreeled and the traction drum 5 when the tensioning element 6 is in the first working position.
In an entirely similar fashion, the control means 11 are capable, by operating on the servomotor (and specifically on the servomotor 13b that is associated with the reel 3b), of bringing, in a controlled manner and according to a rule of motion which can be preset (see for example the trend of φ in the time interval U in Figures 3 and 3a), the tensioning element 6 from the post-connection position (indicated with φ2 in Figures 3 and 3a), and more generally from any position that is different from the first working position (po, to the first working position φ0 by precisely controlling (following the aforementioned rule of motion) its movement over time and, consequently, controlling the tension to which the continuous film 10 is subjected during the entire connection step.
With reference to the embodiment shown schematically in Figure 1, downstream of the traction drum 5 there is an applicator 20 of labels which are applied from the continuous film 10 onto containers to be labeled.
For optimizing the unreeling of the continuous film 10 from the reel 3a, the supporting frame 2 supports, between the reel 3a of continuous film 10 being unreeled and the traction drum 5, a plurality of return rolls 7 which include some return rolls of the tensioning device 7a,
Advantageously, between the at least two reels 3 and the tensioning element 6, there is a joining station 8 which is designed to provide the connection between the end portion of the continuous film 10 being unreeled from the reel 3a about to be depleted and the end portion 3c of the film supported by the other reel 3b.
According to a preferred embodiment, the tensioning element 6 can be constituted by what is called a tensioning dandy roll 6a which is supported by the supporting frame 2 so that it can rotate about a respective pivoting axis 101.
In this specific case, the position of the tensioning element 6 with respect to the supporting frame 2 is defined by the angular shift (φ) of the tensioning dandy roll 6a about the pivoting axis 101 with respect to a predetermined base position,
Conveniently, as previously mentioned, the control means 1 1 comprise means for commanding the servomotor (13a, 13b) that is associated with the two reels (3a, 3b).
Advantageously, the first working position of the tensioning element 6 substantially corresponds to the minimum tension position (designated by (po in the chart shown in Figure 2) so as to minimize the longitudinal stress to which the film being unreeled is subjected and increase the stability of operation of the unreeling assembly 1.
According to a possible embodiment, the control means 11 are adapted to bring the tensioning element 6 from the first working position to the second accumulation position by means of a variation in the angular velocity (to) of the servomotor 13a that is associated with the reel 3a being unreeled.
In practice, the control means 11 are capable of setting, substantially instantaneously, the speed (co) of the servomotor 13a in such a way that the linear velocity of the continuous film 10 being unreeled from the reel 3a (i.e. upstream of the tensioning dandy roll 6a) is greater than the linear velocity of the film on the traction drum 5 (i.e. downstream of the tensioning dandy roll 6a).
This produces the movement of the tensioning dandy roll 6a from the first working position φ0 to the second accumulation position (pi with consequent accumulation of a quantity of continuous film 10 that can be used by the applicator element 20 in the subsequent connection step.
The control means 11 are further capable of operating on the servomotor 13a to exactly control (as can be seen for example in the diagram shown in Figure 3) the angular position of the tensioning dandy roll 6a during the entire connection step and, therefore, both to accumulate the film and to return the tensioning dandy roll 6a from the post-connection angular position φ2 to the first working position φ0 according to a rule of motion which can be preset.
In practical terms, the control means 11 are able to operate on the servomotors (13a, 13b) which are associated with the two reels (3a and 3b) to precisely define the movement of the tensioning dandy roll 6a (and more generally of the tensioning element 6) as a function of time, and according to a rule of motion which can be preset, along the respective movement path 200, unlike what occurs in the unreeling assemblies used today, which operate on the angular velocity of the servomotor or on the braking device only if a shift of the tensioning dandy roll 6a from the working position is detected and, especially, according to a trend that is completely non- controlled, as shown in the diagram in Figure 4.
In some applications, for example if the joining station 8 is capable of making an optimal connection only at reduced linear velocities of the film upstream of the tensioning dandy roll, it will be possible, as shown in the diagram in Figure 3 a, to use a rule of motion (in the sector Δί3) to slow down, before effecting the connection, the linear velocity of the film that is crossing the joining station 8 by "consuming" part of the film accumulated by the tensioning dandy roll 6a in the second accumulation position without necessarily reducing the speed of the traction drum 5.
The operation of the unreeling assembly 1 according to the invention is evident from the foregoing description.
In particular, the first working position φ0 of the tensioning dandy roll 6a is set, advantageously, on the basis of the geometry of the unreeling assembly 1 (position of the return rolls of the tensioning device 7a and of the tensioning dandy roll 6a) so as to minimize, during the operation of the unreeling assembly 1, the tensions to which the continuous film 10 being unreeled is subjected.
Before executing the step of connecting the end portion of the film being unreeled from the reel 3a that is about to be depleted and the free end 3c of the continuous film 10 wound around the other reel 3b, the control means 11, which are for example constituted by a processor or by a PLC, operate on the servomotor 13a that is associated with the reel support 4 on which the reel 3a that is about to be depleted is wound, so as to "force" the movement of the tensioning dandy roll 6a towards the second accumulation position (indicated with (pi in the diagrams in Figure 3 and Figure 3a) according to a rule of motion that can be preset.
This "forcing", as has been explained, is done by acting on the angular velocity ω of the servomotor 13a that is associated with the reel 3a about to be depleted by varying, in particular, this velocity gradually so that the trend of the movement of the tensioning element 6 as a function of time (for the puiposes of example, the variation of φ as a function of time as shown in Figures 3 and 3a) follows a "rule of motion" that is set appropriately.
Similarly, the control means 11 operate on the servomotor 13b so as to gradually return, again following a "rule of motion" which can be preset, the tensioning element 6 from the post-connection position (position indicated with cp2 in Figure 3 and in Figure 3 a) to the first working position φ0.
The rules of motion used to command the movement of the tensioning dandy roll 6a (and, more generally, of the tensioning element 6) along the respective movement path 200 are, in particular, chosen so as to:
a) contain as far as possible the "stress" to which the continuous film 10 is subjected during the connection step; and/or b) limit the quantity of continuous film 10 that is subjected to the variation of tension and, therefore, potentially to be discarded; and/or
c) prevent the detachment of the continuous film 10 from the return rollers 7 and 7a; and/or
d) contain the reduction of the speed of the traction drum 5.
In more detail, the rules of motion are to be considered a succession, as a function of time, of intermediate positions between the initial position (for example <p0 or φ2) and the final position (for example ( i or, respectively, φο) that is desired to be reached.
According to the invention, the control means 11 are adapted to generate an extremely high number of intermediate positions so that the "rules of motion" that are actually followed by the tensioning dandy roll 6a tend towards the preset "rules of motion", such as for example a fifth-order polynomial or a trapezoidal.
All characteristics of the invention, indicated above as advantageous, advisable or similar, may also be missing or substituted by equivalent characteristics.
The individual characteristics set out with reference to general teachings or to specific embodiments may all be present in other embodiments or may substitute characteristics in such embodiments.
In practice it has been found that in all embodiments the invention is capable of fully achieving the set aim and objects.
In particular, the use of an unreeling assembly 1 according to the invention, by making it possible to perceptibly reduce the longitudinal stress on the film being unreeled, allows the use of continuous films (10) with low grammage and/or limited height and/or low quality.
Furthermore, thanks to the control means 11 it is possible to preset several rules of motion so as to make it possible to optimize, for example, the accumulation of film before the connection step or to limit the stress during the passage from the post-connection position to the first working position.
Lastly, it has been found that, with the ability to simultaneously control the speed of the film that is crossing the joining station and the accumulation of the continuous film, an optimal connection can be obtained without necessarily reducing the speed of the traction drum and, therefore, without compromising the productivity of the labeling device.
The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.
In practice the materials used, provided they are compatible with the specific use, as well as the dimensions and the shapes may be any, according to the requirements.
Moreover, all the details may be substituted by other, technically equivalent elements.
The disclosures in Italian Patent Application No. VR2010A000004 from which this application claims priority are incorporated herein by reference.
Where the technical features mentioned in any claim are followed by reference numerals and/or signs, those reference numerals and/or signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference numerals and/or signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference numerals and/or signs.

Claims

1. An unreeling assembly (1), particularly for labeling devices, comprising a supporting frame (2) for at least two reels (3) of continuous film (10) which are supported by a respective reel support (4), which can be actuated to rotate about an unreeling axis (100) of the reel (3) by a respective servomotor (13a, 13b), and a motorized traction drum (5), which is designed to unreel said continuous film (10) from one of said at least two reels (3) of continuous film (10), between the reel (3a) of film being unreeled and said traction drum (5) there being at least one element (6) for tensioning said continuous film (10), said tensioning element (6) being movable, with respect to said supporting frame (2), along a respective movement path (200), characterized in that it comprises control means (11) which operate on said servomotor (13a, 13b) and are adapted to control the position of said tensioning element (6) along the respective movement path (200).
2. The unreeling assembly (1) according to claim 1, characterized in that said control means (11) are adapted to move on command said tensioning element (6) between at least one first working position, in which said tensioning element (6) is adapted to apply a preset tension to said continuous film ( 10) being unreeled, and at least one second accumulation position for increasing the length of the continuous film (10) that lies between said reel (3a) being unreeled and said traction drum (5) with respect to the length of said continuous film, between said reel (3 a) being unreeled and said traction drum (5), with said tensioning element (6) in said first working condition.
3. The unreeling assembly (1) according to claim 1 or 2, characterized in that said control means (11) are adapted to actuate said servomotors (13a, 13b) to move in a preset and gradual manner said tensioning element (6) along the respective movement path (200) according to a rule of motion which can be preset.
4. The unreeling assembly (1) according to one or more of the preceding claims, characterized in that said control means (11) are adapted to move said tensioning element (6) from said first working position to said second accumulation position by means of a variation of the angular velocity of said servomotor (13a) associated with the reel support (4) that supports said reel (3a) being unreeled.
5. The unreeling assembly (1) according to one or more of the preceding claims, characterized in that said first working position of said tensioning element (6) substantially corresponds to the minimum tension position, so as to allow the processing of continuous films (10) with low grammage and/or with limited height.
6. The unreeling assembly (1 ) according to one or more of the preceding claims, characterized in that it comprises, downstream of said traction drum (5), an applicator (20) of labels obtained from said continuous film ( 10) onto containers to be labeled.
7. The unreeling assembly (1) according to one or more of the preceding claims, characterized in that it comprises a plurality of guiding cylinders (7, 7a) between the reel (3a) of film being unreeled and said traction drum (5).
8. The unreeling assembly (1) according to one or more of the preceding claims, characterized in that it comprises, between said at least two reels (3) and said tensioning element (6), a joining station (8) designed to provide the connection between the end portion of the continuous film (10) being unreeled from the reel (3a) about to be depleted and the end portion (3c) of the film supported by the other reel (3b).
9. The unreeling assembly (1) according to one or more of the preceding claims, characterized in that said tensioning element (6) comprises a tensioning dandy roll (6a), which is supported by said supporting frame (2) so that it can rotate about a respective pivoting axis (101).
EP11700915.9A 2010-01-15 2011-01-13 Unreeling assembly, particularly for labeling devices Active EP2523882B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR2010A000004A IT1397685B1 (en) 2010-01-15 2010-01-15 UNBINDING GROUP, PARTICULARLY FOR LABELING DEVICES
PCT/EP2011/050390 WO2011086122A1 (en) 2010-01-15 2011-01-13 Unreeling assembly, particularly for labeling devices

Publications (2)

Publication Number Publication Date
EP2523882A1 true EP2523882A1 (en) 2012-11-21
EP2523882B1 EP2523882B1 (en) 2016-01-06

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US (1) US20130001349A1 (en)
EP (1) EP2523882B1 (en)
ES (1) ES2573577T3 (en)
IT (1) IT1397685B1 (en)
WO (1) WO2011086122A1 (en)

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EP3385203B1 (en) * 2017-04-07 2020-07-08 Mespack, S.L. Web film movement compensating device for a web film movement compensation between a continuous forward movement section and an intermittent forward movement section
CN107792703A (en) * 2017-11-21 2018-03-13 苏州工业园区天势科技有限公司 Transmission detent mechanism for composite label
CN109573159B (en) * 2019-01-18 2024-05-28 广东拓斯达科技股份有限公司 Tectorial membrane device
CN110029468B (en) * 2019-03-25 2021-05-25 浙江富润印染有限公司 Horizontal adjustment driving mechanism of unwinding tensioning roller and cleaning production tensioning system
CN111453520B (en) * 2020-04-10 2021-08-10 重庆泰美自动化科技有限公司 Automatic change screening mask machine dyestripping control system
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Also Published As

Publication number Publication date
IT1397685B1 (en) 2013-01-18
ITVR20100004A1 (en) 2011-07-16
WO2011086122A1 (en) 2011-07-21
US20130001349A1 (en) 2013-01-03
ES2573577T3 (en) 2016-06-08
EP2523882B1 (en) 2016-01-06

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