Labeling apparatus and method

Abstract

A labeling device (1) comprises: a feed roller (11); a gluing roller (12); a cutting roller (13) provided with a cutter (130); and a transfer carousel (14) comprising suction protrusion means (140) angularly distributed along an outer circumference of the transfer carousel (14) and provided with corresponding recesses (140R). The transfer carousel (14) receives the web (2) from the feed roller (11), presses it against the suction protrusions (140), and transports the labels (20) to an unloading area (S). The transfer carousel (14) interacts with the gluing roller (12) in the gluing region (I) and interacts with the cutting roller (13) in the cutting region (T). The glue application roller (12) and the transfer carousel (14) rotate in opposite directions and the glue application region (I) lies behind the cutting region (T) with respect to the path of movement of the web (2). The glue applicator roller (12) cooperates with the suction projection device (140) to spread glue and the cutter (130) is cyclically inserted into a recess (140R) of the suction projection device (140) to cut the web (2) into labels (20).

Description

Technical Field

[0001] This invention relates to a labeling apparatus and a labeling method for applying labels to the surface of a container. Background Technology

[0002] Labeling is a typical process in the beverage industry and other industries, where labels need to be fitted with adhesive so that they can be applied to surfaces in a continuous industrial cycle.

[0003] Typically, labels are obtained from webs wound on a roll. The roll is then cut to obtain the labels to be applied to the container.

[0004] Regarding adhesive application, that is, applying adhesive to suitable areas of the web, some known solutions in the prior art involve using pre-adhesive webs. For example, solutions for pre-adhesive application to webs are described in patent documents EP1871674B1 and EP2507135B1.

[0005] However, in this approach, there is a risk of defects due to improper labeling, which suggests that a different approach is preferred, in which the adhesive is applied after the web is unfolded (e.g., just before or after the web is cut).

[0006] Patent document WO2019243203A1 describes an example of a system for applying adhesive after unfolding the web, wherein the adhesive is applied to the web by a spray gun.

[0007] Regarding cutting, in some known prior art solutions, the web is conveyed by a roller equipped with an anvil and cut by one or more rotating cutters mounted on the cutting roller. These rotating cutters interact with the anvil to cut the web between the cutters and the anvil by pressure cutting. Examples of this method are described in patent documents EP2067701B1, EP2221154B1, EP2279954B1, DE102013215999A1, and EP3919397A1. This method, involving the interaction between the cutter and the anvil to perform pressure cutting, has the disadvantage of causing rapid wear of the cutters.

[0008] An alternative cutting method is described in patent documents WO2021239626A1, WO2021198072A1, and WO2022069415A1, in which the rollers conveying the web are provided with slots to accommodate the cutting tool while the web is being cut. However, this system has complex drawbacks that increase the cost of the equipment.

[0009] Another method for cutting webs is described in patent document EP3925743A1, in which the roller conveying the web is provided with recesses while the web is being cut, and a rotating blade mounted on the cutting roller interacts with these recesses. This cutting method is more economical than schemes where the blade is housed in slots in the conveying roller, and more reliable than schemes where the blade interacts with the anvil. However, the device in patent document EP3925743A1 has the disadvantages of being complex and cumbersome. Furthermore, the method proposed in EP3925743A1 for tensioning the web during cutting by utilizing the rotation of the conveying roller in conjunction with selectively using upstream and downstream suction of the recesses is complex and not very reliable.

[0010] Patent document EP3647213A1 describes a cutting system with multiple suction supports defining a path; a recess is provided between two successive supports, configured to interact with a blade to cut the label. These supports are connected to a rotation axis, allowing them to rotate about the axis while moving relative to each other. Therefore, this system is particularly inconvenient and complex because two successive supports need to be in place during cutting to allow the blade to be inserted into the recess formed by the two successive supports. In this case, there is still a need for a device for applying adhesive to and cutting the web and then applying the label, which is compact or reduced in size, capable of applying adhesive to the web after it has been unfolded, and has a simple, robust, and reliable cutting system. There is also a need to prevent the blade from becoming smudged with adhesive so that the blade can cut the label cleanly and efficiently. Summary of the Invention

[0011] One object of this disclosure is to provide a labeling device and method that overcomes the aforementioned disadvantages of the prior art.

[0012] More specifically, the object of this disclosure is to provide a labeling apparatus and method that allows for the application of adhesive and cutting of a web after it has been unfolded, followed by labeling, using equipment of particularly small size. Another object of this disclosure is to provide a particularly simple, robust, and reliable method for applying and cutting labels.

[0013] These objectives are achieved entirely by the labeling apparatus and method of this disclosure as characterized in the appended claims.

[0014] The purpose of labeling equipment is basically to provide a series of labels with adhesive on them, which are intended to be applied to the corresponding containers.

[0015] More specifically, the labels are made of polymer materials, but they can be made of other materials.

[0016] The label is obtained by cutting the web such that each cut separates a segment of the web from the web itself (where each segment defines a label). Preferably, the label is rectangular in shape because the cut is perpendicular to the web; however, implementations with labels of different shapes (e.g., elongated rectangles) are not excluded.

[0017] Each label has adhesive applied to its front and back areas; thus, each segment (defining the corresponding label) has a front and back area that are coated with adhesive when they are ready to be applied to a container.

[0018] The device includes a feed roll. The feed roll has the function of applying a dragging action on the web; for this purpose, the web is at least partially wound around the feed roll. In one example, the feed roll rotates about a vertical axis. The feed roll is configured to feed the web.

[0019] The labeling equipment also includes an adhesive applicator roller. The adhesive applicator roller has the function of applying adhesive to the surface of the web; more specifically, it has the function of applying adhesive to the surface of the web designed to define front and rear end regions where adhesive is applied. In one example, the adhesive applicator roller rotates about a vertical axis. In particular, the adhesive applicator roller rotates about a third axis of rotation.

[0020] Labeling equipment may include an adhesive reservoir configured to feed adhesive to an adhesive applicator roller. The equipment may also include a scraper mounted rearward of the adhesive reservoir relative to the direction of rotation of the adhesive applicator roller and configured to regulate the spread (i.e., amount of adhesive) of the adhesive on the outer surface of the adhesive applicator roller.

[0021] The coating roller may also have, for example, multiple ridges and / or grooves defining a knurled surface, or alternating grooves and ridges defining a predetermined pattern on its outer surface.

[0022] The labeling equipment also includes a cutting roller. The cutting roller has the function of cutting the web to separate segments. The cutting roller is provided with at least one cutter configured for cutting the web. This at least one cutter rotates together with the cutting roller. In one example, the cutting roller rotates about a vertical axis. Specifically, the cutting roller rotates about a second axis of rotation.

[0023] The labeling equipment also includes a conveyor turntable. The conveyor turntable defines a path for the web material to move along which it remains adhered to the turntable (e.g., on a side surface of the turntable). The conveyor turntable rotates about a first axis of rotation. Therefore, a second axis of rotation is parallel to the first axis of rotation, and a third axis of rotation is parallel to the first axis of rotation.

[0024] The web interacts with the cutting rollers in the cutting zone along the movement path; therefore, the conveyor turntable has the function of interacting with the cutting rollers to cut segments.

[0025] In one example implementation, the web also interacts with the coating roller in the coating area along the movement path; therefore, the transfer turntable also functions to interact with the coating roller to apply adhesive to the surface of the web. In particular, the coating roller and the transfer turntable can be configured to rotate in opposite directions; thus, the respective tangential velocities in the coating area are consistent.

[0026] The conveyor turntable receives the web from the feed rollers in the loading area.

[0027] The conveyor turntable is configured in the unloading area to make pre-cut (and glued) labels available at the exit.

[0028] In one example implementation, the movement path also includes a segment located downstream of the cutting area. In this case, the movement path is a path for moving the web to the cutting area, and then, downstream of the cutting area, it is a path for moving web segments (i.e., labels).

[0029] In this scenario, in one example implementation, along a movement path downstream of the cutting area, a transfer turntable cooperates with a labeling machine (or a central turntable) to transfer labels onto a container (in the unloading area); thus, the transfer turntable also has the function of transferring the cut and glued labels onto the container (which moves on the labeling machine and along the corresponding container movement path; for example, the labeling machine may be a rotary machine, or alternatively a linear machine).

[0030] The unloading area is angularly spaced from the loading area along the web movement path. The adhesive application area and the cutting area are angularly positioned between the loading and unloading areas relative to the web movement path. Preferably, the adhesive application area is located after the cutting area in the web's feed direction from the loading area to the unloading area (i.e., relative to the web's movement path) (but the reverse is also possible). Adhesive is applied after cutting to prevent the cutting tool from becoming contaminated, thus allowing the tool to cut the label cleanly and efficiently.

[0031] In one example implementation, the transfer turntable includes a plurality of suction protrusions (suction pads or support blocks) distributed at an angle along the outer periphery of the transfer turntable.

[0032] Each suction protrusion device may include a single suction protrusion (i.e., a single suction protrusion), or it may include a pair of suction protrusions (i.e., a coating suction protrusion and a cutting suction protrusion).

[0033] Unless otherwise stated, the following description applies to both the first embodiment, which includes a single suction protrusion, and the second embodiment, which includes a pair of suction protrusions (for each suction protrusion device).

[0034] Each protrusion of the suction protrusion device is provided with a recess (radially oriented, i.e., a radial recess). The recess divides each suction protrusion into two parts or extensions, such that each suction protrusion includes a front extension and a rear extension, with the recess located between the front extension and the rear extension. For each suction protrusion, the front extension and the rear extension project radially from the outer periphery of the transfer turntable away from the axis of rotation of the transfer turntable. For each suction protrusion, the front extension is located ahead of the rear extension in the direction of rotation of the transfer turntable.

[0035] The transfer turntable is configured to hold the web (received from the feed rollers in the loading area) adhered to one or more suction protrusions. In one example, the transfer turntable is also configured to use the suction protrusions to hold the label when bringing it into contact with the corresponding bottle.

[0036] Preferably, a plurality of suction protrusions are located on a transfer turntable. Specifically, the plurality of suction protrusions are configured to move integrally with the transfer turntable. The transfer turntable may, for example, rotate about an axis of rotation at a constant speed. Preferably, the plurality of suction protrusions system is configured to move (about the axis of rotation) at a speed equal to the speed of the transfer turntable. More specifically, the recess moves in sync with the suction protrusions, and even more specifically, moves in sync with the transfer turntable.

[0037] Because the suction protrusions and the conveyor turntable move as a unit at the same speed, the distance between one suction protrusion and the next is constant.

[0038] Preferably, each suction protrusion of the suction protrusion system includes a pair of portions (or extensions) and a recess, wherein the recess is located between the extensions and the extensions are etched on the same body. In other words, each suction protrusion includes a body having a pair of extensions and a recess located between the two extensions.

[0039] The rotation of the cutting roller and the rotation of the conveyor turntable are synchronized, causing at least one cutter of the cutting roller to cyclically insert into the recess of the suction protrusion device to cut the web. The interaction between the cutter of the cutting roller and the recess of the suction protrusion device of the conveyor turntable occurs during the cutting step. Thus, the web is cut to separate its segments during the cutting step; in particular, the cutting roller and the conveyor turntable can be configured to rotate in opposite directions; in this way, the respective tangential velocities at the cutting area are consistent.

[0040] The rotation of the coating roller is synchronized with the rotation of the conveyor turntable, causing the coating roller to engage with the suction protrusions of the conveyor turntable to apply adhesive to areas of the web corresponding to the front and rear ends of the label. The interaction between the coating roller and the suction protrusions of the conveyor turntable occurs during the coating step. Therefore, during the coating step, adhesive is applied to the web to form adhesive (or binder) areas on the web.

[0041] Therefore, there are at least a first embodiment and a second embodiment. In the first embodiment, each of the plurality of suction protrusion devices includes one suction protrusion (i.e., a single suction protrusion); in this case, the suction protrusion preferably interacts with the coating roller and also with the cutting roller, that is, the coating roller and the cutting roller are configured to interact with the same suction protrusion. In the second embodiment, each of the plurality of suction protrusion devices includes one coating suction protrusion and one cutting suction protrusion (defining a pair of suction protrusions); the coating suction protrusion is configured to interact with the coating roller during the coating step, while the cutting suction protrusion is configured to interact with the cutting roller during the cutting step.

[0042] The device also includes a control unit.

[0043] It should be noted that synchronization can be achieved (exclusively) through a mechanical system. However, synchronization is preferably achieved through a control unit, also because the cutting roller, the coating roller, and the conveyor turntable each include their own drive motor unit configured to rotate them about their respective axes of rotation. In this case, the control unit is connected to the coating roller, the cutting roller, and the conveyor turntable (i.e., to the motor drive units connected to the coating roller, the cutting roller, and the conveyor turntable) to synchronize their respective rotations, such that the coating roller cooperates with the suction protrusions of the conveyor turntable to apply glue at the front and rear extensions, and such that at least one cutter of the cutting roller is cyclically inserted into the recess of the suction protrusions to cut the web.

[0044] Label cutting, gluing, and transfer to bottles occur on the same conveyor turntable with recesses, making the equipment particularly compact and reliable. In effect, this configuration reduces the number of parts and allows them to be placed in a smaller space, as well as eliminating the need for the cutter to interact with the anvil or other contact surfaces.

[0045] In one embodiment, the rear extension is operably in a retracted position relative to the front extension. In other words, the rear extension protrudes radially from the conveyor turntable to a lesser extent than the front extension. Therefore, the applicator roller is configured to interact with the front extension to apply adhesive to the surface of the web positioned at the front extension.

[0046] For example, each suction protrusion may be asymmetrically shaped about an axis passing through the center (i.e., about an axis passing through the center of the suction protrusion or through the axis of rotation of the recess and the transfer turntable), such that the rear extension protrudes radially from the outer periphery of the transfer turntable to a lesser extent than the front extension. Therefore, the rear extension protrudes less from the transfer turntable than the front extension.

[0047] Additionally or alternatively, the rear extension is movable between an extended position and a (radially) retracted position, wherein in the retracted position, the rear extension protrudes radially from the outer periphery of the transfer turntable to a lesser extent than the front extension protrudes radially from the outer periphery of the transfer turntable. In the retracted position, the degree to which the rear extension protrudes radially from the outer periphery of the transfer turntable can be the same as, or less than, the degree to which the front extension protrudes radially from the outer periphery of the transfer turntable, if necessary.

[0048] The rear extension can be configured to retract radially relative to the axis of rotation of the front extension toward the transfer turntable, at least in the adhesive application area. For example, the rear extension can be moved by a cam.

[0049] Preferably, in a work cycle, the glue-applying roller is configured to apply glue (i.e., the glue-applying roller is configured to cooperate with the suction protrusion of the conveyor turntable to apply glue), and the cutting roller is configured to cut the label from the web (i.e., at least one cutter of the cutting roller is inserted into the recess of the suction protrusion to cut the label from the web). In other words, a work cycle includes a glue-applying step and a label-cutting step from the web.

[0050] Specifically, when the cutting roller (i.e., the cutting area) is located before the adhesive roller, the cutting step precedes the label adhesive application step.

[0051] In one example implementation, the transfer turntable rotates at a constant angular velocity during the work cycle. This ensures that the circumferential speed of the transfer turntable (i.e., the circumferential speed of the area of ​​the transfer turntable suitable for receiving and holding the web adhered thereto) is also constant.

[0052] Furthermore, the angular velocity of the conveyor turntable is variable (from one work cycle to the next or within the same work cycle), for example, varying with the production speed of the equipment, or more specifically, varying with the angular velocity of the central turntable configured to receive multiple bottles and interact with the conveyor turntable to bring the cut labels into contact with the bottles.

[0053] In one example implementation, the feed roller can be configured to vary its rotational speed between a maximum and a minimum value (i.e., a decreasing value or a value less than the maximum value) within the same work cycle. For example, the control unit can be programmed to vary the rotational speed of the feed roller between a maximum and a minimum value (preferably within the same work cycle). In this case, the maximum speed of the feed roller is set to impart a movement speed to the web equal to the circumferential speed of the transfer turntable. Therefore, when the feed roller rotates at its maximum speed, the movement speed imparted by the feed roller to the web is consistent with the circumferential speed of the transfer turntable. On the other hand, when the feed roller rotates at its minimum speed (or in any case at a decreasing speed, below or less than the maximum speed), the movement speed imparted by the feed roller to the web is less than the circumferential speed of the transfer turntable; this produces slippage, causing the transfer turntable (which is moving along the movement path at a higher speed) and the web held adhered to it (and also moving along the movement path, more slowly) to slide relative to each other (i.e., slip).

[0054] The rotation of the feed roller is synchronized (i.e., in phase) with the rotation of the conveyor turntable, the glue roller, and the cutting roller (in other words, the control unit is programmed to coordinate the rotation), such that the feed roller has its maximum speed during the glue application and cutting steps; the rotation of the feed roller is also synchronized (i.e., in phase), such that the feed roller has its minimum speed during a deceleration interval after a label cutting step (and before the next label cutting step); preferably, the deceleration interval is located in time between a label cutting step and the glue application step in the next cycle. Additionally or alternatively, the deceleration interval is located in time between a label glue application step and the label cutting step. In this respect, the speed of the feed roller can employ a first minimum speed in a first deceleration interval and a second minimum speed in a second deceleration interval, the first deceleration interval being located in time between a label glue application step and the cutting step, and the second deceleration interval being located in time between the label cutting step and the label glue application step in the subsequent work cycle. In this respect, the deceleration interval includes both the first and second deceleration intervals.

[0055] It should be noted that the term "minimum value" includes both the case where the minimum value is relative and the case where the minimum value is absolute (for example, the first minimum speed can be a relative minimum value, the second minimum speed can be an absolute minimum value, and vice versa).

[0056] Therefore, during the deceleration interval, the feed rollers slide between the web, which is positioned in contact with the outer periphery of the conveyor turntable, and the conveyor turntable itself.

[0057] The rotation of the feed rollers is synchronized with the rotation of the conveyor turntable (i.e., in phase) (in other words, the control unit is programmed to coordinate the rotation) such that at the end of the deceleration interval, when the feed rollers are once again at their maximum speed, the web is positioned on the conveyor turntable such that the portion of the web to be cut and / or coated is located in the recess of a suction protrusion.

[0058] It should be noted that, operably, the suction protrusions are arranged along the outer periphery of the conveyor turntable, such that two successive suction protrusions are separated by an arc greater than the label length (the web segment constituting the label has a predetermined length). Therefore, the sliding caused by the deceleration of the feed roller relative to the conveyor turntable has the effect of separating the just-cut segment from the rest of the web (because as the web decelerates, the cut segment continues to move with the conveyor turntable). Furthermore, the sliding caused by the deceleration of the feed roller relative to the conveyor turntable has the effect of correctly repositioning the web relative to the next portion to be coated and cut, aligning that portion with the next suction protrusion.

[0059] It should be noted that the coating roller is configured to interact with the suction protrusion device to apply adhesive to the surface of the web at the front and rear extensions (while no adhesive is applied to the portion of the web between the front and rear ends, i.e., no adhesive is applied to the area of ​​the web facing the suction protrusion), such that each segment has a front and rear end region with adhesive (and no adhesive is applied to the portion of the web between the two adhesive regions, which is the part to be cut). In other words, with each interaction between the coating roller and the web connected to a suction protrusion, adhesive is applied to two regions close to each other but separated by a gap along the direction of movement of the web (i.e., a pair of regions), which correspond to the rear end of one segment and the front end of the next segment; in effect, cutting is performed in the region of the web between these two adhesive regions after the coating step.

[0060] In one embodiment, the feed roller has its maximum speed during the cutting and gluing steps, and its minimum speed during the deceleration interval between the gluing step and the label cutting step in the next cycle. Therefore, during the cutting and gluing steps, the gluing roller is configured to move the web at a speed equal to the circumferential speed of the conveyor turntable. After the gluing step, i.e., after passing through the gluing area (along the web's feed path), the feed roller is configured to move the web at a speed less than the circumferential speed of the conveyor turntable during the deceleration interval. During the deceleration interval, the cut and glued label travels along the movement path at a speed equal to the circumferential speed of the conveyor turntable; during the deceleration interval, the web is configured to slide (or glide) along the outer circumference of the conveyor turntable such that the rear end region of the next label (i.e., the label yet to be cut after the one that has just been cut and glued) is positioned at the next front extension (after the front extension where the cutting has just occurred).

[0061] Note that, in this case, preferably, the distance between the cutting area and the gluing area (i.e., the distance between the cutting roller and the gluing roller) is less than the length of the label. Furthermore, the gluing roller is configured to cooperate with the suction protrusion device that has cut the label; thus, the gluing roller is configured to apply glue to the rear end area of ​​the just-cut label and the front end area of ​​the next label. Also note that, in this case, the suction protrusion device can be symmetrical about an axis passing through its center and the axis of rotation of the conveyor turntable; that is, the degree to which the front extension protrudes radially from the outer periphery of the conveyor turntable is the same as the degree to which the rear extension protrudes radially from the outer periphery of the conveyor turntable.

[0062] In one example, when the cutting area is before the gluing area (i.e., the cutting roller is before the gluing roller), the feed roller can have a maximum speed during the cutting step and a minimum speed during the deceleration interval between the label cutting step and the gluing step of the cut label. Therefore, during the cutting step, the feed roller is configured to move the web at a speed equal to the circumferential speed of the conveyor turntable. After the cutting step, i.e., after passing through the cutting area (along the feed path of the web), the feed roller is configured to move the web at a speed less than the circumferential speed of the conveyor turntable during the deceleration interval. During the deceleration interval, the web is configured to slide along the outer circumference of the conveyor turntable such that the rear end region of the next label (i.e., the label yet to be cut after the one just cut) is located at the next front extension (after the front extension where the cutting has just occurred). During the deceleration interval, the cut label travels at a speed equal to the circumferential speed of the conveyor turntable, causing the gluing roller to interact with the front end region and the rear end region of the cut label to apply glue thereon.

[0063] Note that, in this case, preferably, the distance between the cutting area and the gluing area (i.e., the distance between the cutting roller and the gluing roller) is greater than the length of the label. The gluing roller engages with the suction element and with the front extension of the suction protrusion device where the cutting has occurred. Also note that the rear extension is operably in a retracted position relative to the front extension, i.e., the rear extension protrudes radially from the outer periphery of the conveyor turntable to a lesser extent than the front extension; in practice, during time intervals, the web exposes the rear extension by sliding on the conveyor turntable, and the retracted position of the rear extension relative to the front extension prevents the protrusion from being smudged with glue when the protrusion device interacts with the gluing roller.

[0064] It should be noted that for each suction protrusion, the front extension and the rear extension are suction extensions; for example, the front extension and the rear extension are provided with suction pipes connected to a compressor or a vacuum source.

[0065] In one example implementation, each suction protrusion is configured to generate a suction effect in the recess (also). This suction effect in the region where the recess is located serves to tension the portion of the web positioned at the recess. Tensing the web in the region to be cut has the advantage of improving cut quality in a particularly simple manner. Alternatives for obtaining a tensioning effect on the recess-facing portion of the web can also be envisioned: for example, the two extensions of the suction protrusion may oscillate toward and away from each other along the path of movement.

[0066] In one example implementation, when each of the plurality of suction protrusion devices includes a coating suction protrusion for interacting with a coating roller and a cutting suction protrusion for interacting with a cutting roller, the feed roller is configured to generate a first sliding action between the web and the conveyor turntable during a first deceleration time interval and a second sliding action between the web and the conveyor turntable during a second deceleration time interval, such that at the end of the second deceleration time interval, the web is positioned on the conveyor turntable such that the portion of the web to be cut is located at the recess of the cutting suction protrusion.

[0067] In one embodiment, the angular distance between the cutting roller and the coating roller is 10° to 30°, more specifically, the angular distance is substantially 20°, wherein the angular distance lies between the radial rays connecting the first and second rotation axes and the radial rays connecting the first and third rotation axes. The distance between the cutting roller and the coating roller ensures that when the suction protrusion is in the coating area (in other words, when the suction protrusion interacts with the coating roller), the head and tail extensions of the suction protrusion are completely covered by the web material.

[0068] For example, the feed roller is configured to vary its speed throughout the work cycle. For instance, the feed roller speeds can be synchronized such that the feed roller has a minimum speed during the time interval between the glue application stage of a label and the subsequent label cutting stage. Alternatively, the feed speeds can be synchronized such that the feed roller has a maximum speed (preferably equal to the speed of the conveyor roller) during the time interval between the label cutting step and the label glue application step. The function of the deceleration time interval is to allow the web to slide relative to the conveyor turntable, thereby positioning it in the recess.

[0069] In this case, the smaller the distance between the cutting roller and the coating roller (e.g., 20°), the shorter the time interval between the minimum tape feed speeds. For example, having the smallest possible feed speed interval is particularly advantageous to ensure sufficient label production speed.

[0070] In one example, the diameter of the coating roller is between Φ160 and Φ110; more specifically, the diameter of the coating roller is essentially Φ120. Reducing the diameter of the coating roller allows the cutting roller and the coating roller to be placed closer together.

[0071] In one embodiment, a cutting roller extends along a second axis between a first end and a second end. The cutting roller may include a movement system configured to move the cutting roller about the second axis, and more specifically, to move a tool about the second axis; a coating roller extends along a third axis between the first end and a second end and includes a movement system for moving it about the third axis. The first end of the cutting roller and the first end of the coating roller lie in a concentric half-plane that cuts the conveyor turntable perpendicular to its first axis. The cutting roller movement system and the coating roller movement system may be located at the same end (e.g., both at the first or second end) or at opposite ends (e.g., one system at the first end and the other at the second end, or vice versa).

[0072] Positioning the moving system at opposite ends allows the cutting roller and the coating roller to be brought closer together.

[0073] This disclosure also provides a labeling method.

[0074] The method includes the step of feeding a web (the web is made of label material). Preferably, the web feeding step is performed by a feed roller.

[0075] The method also includes the step of cutting the web to divide it into web segments that form labels. The cutting step is performed by a cutting roller on which at least one cutter is mounted. The cutting roller can rotate about a second axis.

[0076] The method also includes an adhesive application step, namely, applying adhesive to the surface of the web. The adhesive application step is preferably performed by an adhesive application roller. The adhesive application roller is rotatable about a third axis.

[0077] The method also includes the step of moving the web along the movement path.

[0078] This movement is accomplished by means of a conveyor turntable. The conveyor turntable can rotate about a first axis. In particular, the second and third axes are parallel to the first axis. The coating roller and the conveyor turntable can rotate in opposite directions.

[0079] The transfer turntable receives the web in the loading area (from the feed rollers) and maintains its adhesion as the web moves along the movement path.

[0080] The cutting step is performed during the movement of the web along the movement path. More specifically, the conveyor turntable interacts with the cutting rollers in the cutting zone. The cutting zone is positioned downstream of the loading zone relative to the web movement path.

[0081] The conveyor turntable transports the web-cut segments to the unloading area; therefore, the movement path has a first segment where the web is not cut (upstream of the cutting area) and a second segment where the label is located (downstream of the cutting area).

[0082] The adhesive application step takes place during the movement of the web along the travel path. More specifically, the transfer turntable interacts with the adhesive application rollers in the adhesive application area. The adhesive application area (similar to the cutting area) is located downstream of the loading area. The adhesive application area and the cutting area are located upstream of the unloading area. Therefore, the adhesive application area and the cutting area are located at an angle relative to the web travel path between the loading area and the unloading area.

[0083] The adhesive application area can be located before or after the cutting area relative to the web movement path.

[0084] In the unloading area, labels are transferred to a labeling machine (or central turntable); for example, the labeling machine includes a labeling turntable, and the labels are transferred to the labeling turntable, i.e., directly onto the bottles conveyed by the labeling turntable. Alternatively, in the unloading area, labels can be directly fed out or transferred to an additional conveyor turntable.

[0085] In one example embodiment, the transfer turntable includes a plurality of suction protrusions distributed at an angle along the outer periphery of the transfer turntable. In the (first) embodiment, each suction protrusion may include one suction protrusion (i.e., a single suction protrusion), or in the (second) embodiment, it may include a pair of suction protrusions (i.e., an adhesive suction protrusion and a cutting suction protrusion).

[0086] It should be emphasized that the concepts described in the first and second embodiments of the device in this disclosure also apply to the method.

[0087] Each suction protrusion of the suction protrusion device may be provided with a corresponding recess.

[0088] In this configuration, as the web moves along the moving path, the web (or each web segment) remains adhered to one or more suction protrusions (from the loading area to the unloading area).

[0089] The method includes synchronizing the movement step (on a transfer turntable) and the cutting step. Preferably, the method includes synchronizing the movement step, the cutting step, and the feeding step. More preferably, the method includes synchronizing the movement step, the cutting step, the feeding step, and the adhesive application step.

[0090] In this configuration, the rotation of the cutting roller and the rotation of the conveyor turntable are synchronized, causing at least one cutter of the cutting roller to be cyclically inserted into the recess of the suction protrusion device in order to cut the web.

[0091] The rotation of the coating roller and the rotation of the conveyor turntable are synchronized, so that the coating roller applies glue to the surface of the web at the suction protrusions positioned on the conveyor turntable.

[0092] The method may include the step of feeding adhesive to a coating roller via an adhesive reservoir. It may also include the step of adjusting the distribution (i.e., amount of adhesive) of the adhesive on the outer surface of the coating roller via a doctor blade. The doctor blade is mounted rear of the adhesive reservoir relative to the direction of rotation of the coating roller.

[0093] The coating roller may also have multiple ridges and / or grooves defining a knurled surface on its outer surface.

[0094] In one embodiment, preferably at least during the adhesive application step, the rear extension is in a retracted position relative to the front extension, such that the adhesive roller interacts with the front extension to apply adhesive to the surface of the web positioned at the front extension.

[0095] For example, each suction protrusion may be asymmetrically shaped about an axis passing through the center, such that the rear extension protrudes radially from the outer periphery of the transfer turntable to a lesser extent than the front extension. Alternatively or additionally, the rear extension may be movable between an extended position and a retracted position, wherein in the retracted position, the rear extension protrudes radially from the outer periphery of the transfer turntable to a lesser extent than the front extension.

[0096] In one example implementation, the transfer turntable rotates at a constant angular velocity. The circumferential speed of the transfer turntable is also constant.

[0097] Preferably, in one work cycle, the glue-applying roller applies glue, and the cutting roller cuts the label from the web. Therefore, in one work cycle, the conveyor turntable can rotate at a constant angular velocity, making the circumferential speed of the conveyor turntable constant.

[0098] The feed roller can, for example, vary its rotational speed between a maximum and a minimum during a work cycle. At its maximum speed, the feed roller imparts a movement speed to the web equal to the circumferential speed of the conveyor turntable. Therefore, the feed roller speed varies periodically according to a predetermined curve, thus defining a cycle corresponding to (i.e., depending on) the work cycle of the equipment. The cycle of the feed roller speed (which is a time interval) includes a synchronization phase where the rotational speed has a maximum value (i.e., a synchronization time interval) and a deceleration phase where the feed roller's rotational speed is less than the maximum speed (i.e., a deceleration time interval). Therefore, the minimum rotational speed of the feed roller is used during the deceleration time interval. During the deceleration time interval, the feed roller slides between the web, which is positioned in contact with the outer circumference of the conveyor turntable, and the conveyor turntable itself. At the end of the deceleration time interval (during the synchronization time interval), the web is positioned on the conveyor turntable so that the portion of the web to be cut is located in the recess of a suction protrusion, and the web resumes movement synchronously with the movement of the conveyor turntable.

[0099] In one example embodiment, the rotation of the applicator roller, the cutting roller, and the conveyor turntable is synchronized, such that the feed roller has maximum speed during the applicator and cutting steps. In another example embodiment, the rotation of the applicator roller, the cutting roller, and the conveyor turntable is synchronized, such that the deceleration time interval is located between the cutting step of one label and the applicator step of the next label; in this case, preferably, each suction protrusion device includes a (single) suction protrusion that interacts with the applicator roller during the applicator application step and with the cutting roller during the cutting step.

[0100] In another example, the rotation of the applicator roller, the cutting roller, and the conveyor turntable is synchronized, such that the deceleration time interval includes a first deceleration time interval located in time between the applicator and cutting steps of a label, and a second deceleration time interval located in time between the cutting step of the label and the applicator steps of the label in the subsequent cycle; in this case, preferably, each suction protrusion device includes an applicator suction protrusion that interacts with the applicator roller in the applicator application step, and a cutting suction protrusion that interacts with the cutting roller in the cutting step. During the first deceleration time interval, the feed roller creates a first sliding action between the conveyor turntable and the web positioned in contact with the outer periphery of the conveyor turntable. At the end of the first deceleration time interval (in the synchronization time interval), the web is positioned on the conveyor turntable such that the portion of the web to be cut is located in the recess of a suction protrusion device, and the web resumes synchronous movement with the movement of the conveyor turntable during the cutting step. During the second deceleration time interval, the feed roller creates a second sliding action between the conveyor turntable and the web. At the end of the second deceleration time interval (in the synchronization time interval), the web is positioned on the conveyor turntable so that the portion of the web to be coated is located in the recess of a suction protrusion, and the web resumes to move synchronously with the movement of the conveyor turntable during the coating step.

[0101] Preferably, in each work cycle, the adhesive application step precedes the cutting step; in any case, the cutting step and the adhesive application step are performed during a synchronization time interval (in the case of a cycle in which the speed of the feed roller is changed).

[0102] However, in one example, the glue application step precedes the cutting step in each work cycle.

[0103] In one embodiment, the glue-applying roller interacts with a suction protrusion to apply glue to the surface of the web located at the front and rear extensions; in this case, the feed roller has a maximum speed during the cutting and glue-applying steps and a minimum speed during a deceleration interval that is time-wise between the glue-applying step and the label-cutting step in the next cycle (i.e., time-wise after the cutting step and before the label-cutting step in the next cycle).

[0104] It should be noted that if adhesive is applied after cutting and at a relatively large distance from the cut, the deceleration time interval is located between the label cutting step and the next label cutting step; if adhesive is applied after cutting but at a relatively small distance from the cut, the deceleration time interval is located between the label adhesive application step and the label adhesive application step of the next cycle.

[0105] In one example implementation, the method includes, for example, creating a negative pressure in the recess by air suction in the recess; this causes the web portion positioned in the recess to be tensioned during the cutting step. Attached Figure Description

[0106] These and other features will become more apparent from the following description of preferred embodiments illustrated by way of non-limiting example in the accompanying drawings:

[0107] - Figures 1A to 1D and Figures 2A to 2D A device 1 is shown according to one or more aspects of this disclosure;

[0108] - Figure 3 A cutting roller 13 interacting with a conveyor turntable 14 is shown according to one or more aspects of this disclosure;

[0109] - Figure 4 A coating roller 12 interacting with a transfer turntable 14 according to one or more aspects of this disclosure is shown;

[0110] - Figure 5A and Figure 5B A device 1 is shown according to one or more aspects of this disclosure;

[0111] - Figures 6A to 6C Parts of an applicator roller 12 according to one or more aspects of this disclosure are shown;

[0112] - Figures 7A to 7D , Figures 9A to 9E as well as Figures 10A to 10D The operating sequence of device 1 according to one or more aspects of this disclosure is shown;

[0113] - Figure 8A and Figure 8B A suction protrusion device 140 according to one or more aspects of this disclosure is shown;

[0114] - Figure 11A and Figure 11B A graph showing the rotational speed of the feed roller 11 according to one or more aspects of this disclosure is provided;

[0115] - Figures 12A to 12C Device 1 is shown according to one or more aspects of this disclosure. Detailed Implementation

[0116] The number 1 in the attached diagram indicates a labeling device. Device 1 includes a feed roller 11, a glue-applying roller 12, a cutting roller 13, and a conveyor turntable 14. The feed roller 11, glue-applying roller 12, cutting roller 13, and conveyor turntable 14 each rotate about a corresponding axis of rotation. Specifically, the conveyor turntable 14 is configured to rotate about a first axis of rotation X1, the cutting roller 13 is configured to rotate about a second axis of rotation X2 parallel to the first axis of rotation X1, and the glue-applying roller 12 is configured to rotate about a third axis of rotation X2 parallel to the first axis of rotation X1.

[0117] The apparatus 1 also includes a first roll 15A and a second roll 15B, each roll consisting of a web 2 of label material wound on a spool. The apparatus 1 includes a film buffer (or rocker arm) 16 configured to receive the unfolded web 2 from either the first roll 15A or the second roll 15B. Preferably, the film buffer 16 receives the web 2 unfolded from the first roll 15A, while the second roll 15B remains in reserve; conversely, the film buffer 16 receives the web 2 unfolded from the second roll 15B, while the first roll 15B remains in reserve. The function of the film buffer 16 is to maintain a constant tension on the web 2. The apparatus 1 includes a web guide 17 configured to receive the tensioned web 2 from the film buffer 16 and to orient and align the web 2 for feeding to the feed roller 11.

[0118] The feed roller 11 receives the web from the web guide 17 in the loading area C and feeds the web 2 to the transfer turntable 14.

[0119] The glue-applying roller 12 is configured to interact with the conveyor turntable 14 in the glue-applying area I to apply glue to the surface of the web 2.

[0120] The apparatus 1 may include an adhesive reservoir 121 configured to feed adhesive to an adhesive applicator roller 12. The apparatus 1 may also include a scraper 122 mounted rear of the adhesive reservoir 121 in a direction of rotation relative to the adhesive applicator roller 12 and configured to adjust the spread (i.e., amount of adhesive) of the adhesive on the outer surface of the adhesive applicator roller 12.

[0121] The coating roller 12 may also have a plurality of ridges and / or grooves defining a knurled surface, or alternating grooves and ridges defining a predetermined pattern, on its outer surface 120. For example, each ridge may define a parallelepiped protruding from the outer surface of the coating roller 12. Each parallelepiped may have a first side and a second side adjacent to the first side to define a pair of first sides L1 and a pair of second sides L2. Preferably, sides L1 and L2 are of the same length.

[0122] The cutting roller 13 includes a cutter 130, which is configured to interact with the conveyor turntable 14 in the cutting area T to cut the web 2, thereby dividing the web 2 into segments that constitute the label 20.

[0123] Therefore, the conveyor turntable 14 receives the web 2 from the feed roller 11 in the loading area C; then it interacts with the glue roller 12 in the glue application area I to apply glue to the web 2, and interacts with the cutting roller 13 in the cutting area T to divide the web 2 into labels 20.

[0124] Furthermore, in the loading area, the transfer turntable 14 can receive the web 2 from the feed roller 11, which interacts with the cutting roller 13 in the cutting area T to divide the web 2 into labels 20, and then interacts with the glue roller 12 in the glue application area I to apply glue to the labels 20.

[0125] The device 1 includes a central turntable 18 rotating about its own axis, an inlet station 18A for a plurality of bottles 21 to be labeled, and an outlet station 18B for a plurality of labeled bottles 21. The central turntable 18 is configured to receive a plurality of bottles 21 from the inlet station 18A. A transfer turntable 14 also interacts with the central turntable 18 in an unloading area S to bring cut labels 20 into contact with corresponding bottles 21. The central turntable 18 is also configured to transfer a plurality of labeled bottles 21 to the outlet station 18B.

[0126] Therefore, inside the device, the web 2 moves along the movement path, passing through the loading area C, the adhesive application area I, and the cutting area T, where it is cut into labels 20. The labels 20 are then applied to the bottle 21 in the unloading area S. Note that the cutting area T can also be located before the adhesive application area.

[0127] Generally, the unloading area S of the transfer turntable defines the location where labels are transferred to the central turntable 18 to be applied to the bottle 21, or defines the location where labels are sent directly from the device 1 or transferred to an auxiliary turntable (e.g., an auxiliary transfer turntable).

[0128] For example, device 1 may include an additional conveyor turntable between conveyor turntable 14 and central turntable 18 along the movement path of web 2 or label 20. Conveyor turntable 14 may be configured to interact with the additional conveyor turntable to transport the cut labels to the additional conveyor turntable. The additional conveyor turntable may be configured to contact the cut labels 20 with the corresponding bottles 21 by interacting with the central turntable 18.

[0129] More specifically, the transfer turntable 14 includes a plurality of suction protrusions 140. The suction protrusions 140 are distributed at an angle around the outer periphery of the transfer turntable 14. Each suction protrusion 140 includes a recess 140R, a front extension 140T, and a rear extension 140C. The recess 140R is located between the front extension 140T and the rear extension 140C and is radially oriented, while the front extension 140T and the rear extension 140C project radially from the outer periphery of the transfer turntable 14 away from the axis of rotation of the transfer turntable 14. The front extension 140T is located ahead of the rear extension 140C relative to the direction of rotation of the transfer turntable 14. For each suction protrusion 140, the front extension 140T and the rear extension 140C are provided with suction channels connected to a compressor or vacuum source to generate a suction effect, by which the web 2 (and the individual label 20) is held adhered to the outer periphery of the conveyor turntable along a portion of the travel path; more specifically, the suction holds the web adhered to the suction protrusion device 140. The rotation of the conveyor turntable 14, the glue roller 12, and the cutting roller 13 is synchronized, such that each suction protrusion device 140 performs three functions; the first function is to hold the web 2 adhered to the conveyor turntable 14 through the suction channels. The second function is to cooperate with the glue roller 12 in the glue application step, so that glue is applied to the areas of the web 2 that contact the front extension 140T and the rear extension 140C; more specifically, the front extension 140T applies glue to the rear end region 20B of the label 20, and the rear extension 140C applies glue to the front end region 20A of the label 20 following the feed direction of the web 2 on the conveyor turntable. The third function is to cooperate with the cutting roller 13 in the cutting step, so that the cutter 130 of the cutting roller 13 inserts into the recess 140R of the suction protrusion 140 to divide the web 2 into labels 20. More specifically, the cutter 130 separates the rear end region 20B of a label 20 from the front end region 20A of the subsequent label 20 by cutting the web 2 in a separation region 20S between the rear end region 20B of a label 20 and the front end region 20A of the subsequent label 20.

[0130] In one example, each suction protrusion 140 cooperates with the adhesive roller 12 during the adhesive application step, such that adhesive is applied to the label area 20 located at the front extension 140T of the suction protrusion 140 (according to the alternative second function). In this case, the cutting area T is preferably located before the adhesive application area I. In one example, when cutting precedes adhesive application, the adhesive roller 12 applies adhesive to the front extension 140T of the suction protrusion 140 and the suction element 141.

[0131] In the first embodiment, each suction protrusion device 140 includes a single suction protrusion 140 (divided into two extensions with a recess between the two extensions), which is configured to interact with both the coating roller 12 and the cutting roller 13; thus, the suction protrusion 140 performs both the (second) coating function and the (third) cutting function.

[0132] In the second embodiment, each suction protrusion device 140 includes a pair of suction protrusions 140 (each suction protrusion is divided into two extensions with a recess in between), specifically an adhesive application suction protrusion 140' and a cutting suction protrusion 140''. The adhesive application suction protrusion 140' is configured to interact with the adhesive application roller 12 during the adhesive application step, thereby performing a (second) adhesive application function. The cutting suction protrusion 140'' is configured to interact with the cutting roller 13 during the cutting step, thereby performing a (third) cutting function.

[0133] Unless otherwise stated, this disclosure applies to both the first and second embodiments.

[0134] Therefore, the equipment 1 cyclically performs the adhesive application step of the web 2 and the cutting step of cutting the web 2 into labels 20. Alternatively, the equipment performs the steps of cutting the web 2 into labels 20 and applying adhesive to the labels 20.

[0135] The transfer turntable 14 also includes a plurality of suction elements 141 angled around its outer periphery. The suction elements 141 are spaced apart from each other and from suction protrusions 140. The suction elements 141 protrude from the transfer turntable 14 to a lesser extent than the suction protrusions 140. Specifically, in one example, the suction elements 141 protrude from the transfer turntable 14 to a lesser extent than a single suction protrusion 140. In another embodiment, the suction elements 141 protrude from the transfer turntable 14 to a lesser extent than the pair of suction protrusions, or to a lesser extent than the adhesive-coating suction protrusion 140' and / or the cutting suction protrusion 140''. Specifically, when the adhesive is applied before cutting, the suction element 141 protrudes less; when the adhesive is applied after cutting and the distance between T and I is less than the length of the label, the suction element 141 protrudes less; when the adhesive is applied after cutting and the distance between T and I is greater than the length of the label, the degree of protrusion is the same as the degree of protrusion of the front extension 140T.

[0136] The suction element 141 is also provided with a suction conduit connected to a compressor or vacuum source to generate a suction effect that keeps the web 2 (and the individual label 20) adhered to the suction element 141 during transport along the movement path.

[0137] More specifically, the suction protrusions 140 are spaced apart from each other along the outer periphery of the transfer turntable 14, covering an arc of length L. Each label 20 is characterized by a length l such that the distance l between each suction element 141 and the suction protrusion 140 following it (in the rotation direction of the transfer turntable 14) is equal to the length of the label 20. Therefore, when the cutting step of the label 20 is completed, the rear end region 20B of the label 20 is held on the transfer turntable 14 by suction on the front extension 140T of the cut suction protrusion 140, while the front end region 20A of the label 20 is held on the transfer turntable 14 by suction element 141 located in front of the cut suction protrusion 140 (in the rotation direction of the transfer turntable 14).

[0138] The suction element 141 also has the function of transferring (placing) the front end area 20A of the label 20 cut from the web 2 onto the bottle 21 (or conveying the front end area 20A of the cut label outside the device 1 or conveying it onto an additional conveyor turntable).

[0139] More specifically, the length l of the label 20 is such that l < L, so that each suction element 141 is spaced from the next suction protrusion 140 by an arc of length Ll = dl.

[0140] During a work cycle that includes a label application step and a cutting step, the transfer turntable 14 rotates at a constant angular velocity, such that the circumferential speed of the transfer turntable is V. t It is constant, while the feed roller is at a value V during the working cycle. a =V a Changing its speed V between min and maximum speed a At maximum speed, the feed roller speed is set to value V. a =V a max. More specifically, the maximum speed of the feed rollers makes V a max=V t The minimum speed of the feed roller makes V a min < V t .

[0141] Therefore, when the speed V of the feed roller 11 a equals V a At max speed, the feed roller 11 imparts a speed V to the web 2 equal to that of the transfer turntable 14. t Movement speed.

[0142] Next, the feed roller 11 is decelerated to V. a min, then accelerate to return to V again a max. When it reaches V a max, with V a Run at maximum speed and decelerate to V. a The moment min and its re-reaching of V a The time between the moments of max is called the cycle period T. c As it decelerates to V a min、with V a Run at minimum speed, accelerate to V a The moment when max is reached and when it reaches V a The time interval between the moments of maximum deceleration is called the deceleration time interval T. dec During the deceleration time interval T dec In the middle, the rotational speed V of the feed roller 11 a Always less than the rotational speed V of the conveyor turntable t (In other words, the deceleration time interval T) dec It is V a min <= V a <V a The maximum time interval). More specifically, during the deceleration time interval T. dec In the middle, the web 2 slides relative to the outer periphery of the conveyor turntable 14.

[0143] Therefore, when the speed of the feed roller 11 is at its maximum speed, the glue application step and the cutting step are performed.

[0144] Therefore, in the first embodiment where the suction protrusion device 140 includes only one (i.e., a single) suction protrusion 140, and in the second embodiment where the suction protrusion device 140 includes an adhesive-coating suction protrusion 140' and a cutting suction protrusion 140'', the speed V a It can be varied in the first mode and the second mode respectively.

[0145] In the first mode (e.g.) Figure 11A (This is purely by way of example) After the cutting step, during the deceleration time interval T dec In the middle, the feed roller 11 decelerates, while the cut labels 20 are conveyed at a speed V on the turntable. t The fabric moves along the movement path; simultaneously, the uncut web 2 slides, causing the web 2 to be repositioned so that the separation region 20S (i.e., the region between the rear end region 20B of the next label 20 to be cut and the front end region 20A of the next label 20) is positioned at the recess 140R of the suction protrusion 140 after the cut suction protrusion 140. More specifically, the deceleration time interval T dec The web cover distance d1 is necessary.

[0146] In the second mode (e.g.) Figure 11B (This is purely by way of example) After the glue application step that occurs when the glue suction protrusion 140' encounters the glue application roller 12, at the glue suction protrusion 140', the feed roller 11 moves at the first deceleration time interval T dec During period 1, decelerate to the first minimum speed V a min1; The slowing down of the feed roller 11 relative to the transfer turntable 14 causes the web 2 to slide first relative to the transfer turntable 14, such that the glued portion of the web is positioned at the cutting suction protrusion 140'' (specifically, such that the separation area 140S of the label is positioned at the recess 140R of the cutting suction protrusion 140''). Thereafter, the feed roller 11 returns to a speed equal to V of the speed of the transfer turntable 14 during the cutting step. a Max speed. After the cutting step, the feed roller 11 reaches the second deceleration time interval T. dec During period 2, the speed is reduced again to the second minimum speed V. a min2; During this step, the label 20 that has just been cut travels together with the conveyor turntable 14, and the rest of the web 2 slides to be repositioned such that the separation area 20S (i.e., the area between the rear end area 20B of the next label 20 to be cut and the front end area 20A of the next label 20 thereafter) is positioned at the recess 140R of the suction protrusion 140' for applying adhesive.

[0147] Therefore, in the operating sequence of device 1, firstly, the feed roller 11 feeds the continuous web 2 to the transfer turntable 14 in the loading area C. The transfer turntable 14 transports the web 2 to the gluing area I, where the gluing roller 12 applies glue to the web 2 at the rear end region 20B of the label 20 and subsequently at the front end region 20A of the label 20. In particular, during the gluing step, the rear end region 20B of the label 20 contacts the front extension 140T of the suction protrusion 140, and the front end region 20A contacts the rear extension 140C of the suction protrusion 140. Subsequently, the web 2 travels together with the conveyor turntable 14 to the cutting zone, where the cutting roller 13 is synchronized so that the cutter 130 is inserted into the recess 140R of the suction protrusion 140 between the front extension 140T and the rear extension 140C to separate the label 20. Specifically, the rear end region 20B of the label 20 is separated from the front end region 20A of the subsequent label (and then the label is cut in the separation zone 20S). The label 20, separated from the web 2, travels together with the conveyor turntable 14 to the unloading zone S, where the label 20 is applied to the bottle 21. More specifically, from the cutting zone to the unloading zone S, the rear end region 20B of the label 20 remains on the outer periphery of the conveyor turntable 14 due to the suction of the front extension 140T, while the front end region 20A of the label remains on the outer periphery of the suction element 141 before the suction protrusion 140 that has just been cut.

[0148] Specifically, in the adhesive application and cutting steps, the speed V of the feed roller... a Constantly maintain its maximum V a max.

[0149] In the first mode, the feed roller 11 decelerates to V immediately after the cutting step. a min, and the web 2 slides on the outer periphery of the conveyor turntable 14, so that the rear end region 20B of the label 20 after the one just cut and the front end region 20A of the next label 20 after that label 20 are positioned at the suction protrusion 140 after the one just cut (therefore, the separation region 20S is at the recess 140R). Simultaneously with repositioning, the feed roller speed V... a Reaching maximum speed V again a The maximum value is reached, and the next cycle begins. Therefore, each cycle includes a first step F1 and a second step F2. The first step F1 includes the application and cutting steps, in which the feed roller speed V... a It is the maximum speed and equal to the speed V of the transfer turntable 14. t The second step F2 includes a repositioning step, in which the speed of the feed roller is changed from V. a max to V amin, or vice versa. More specifically, it should be noted that during the deceleration time interval T... dec During this period, the rear end region 20B of a label 20 and the front end region 20A of the label behind the label 20 are positioned on the suction protrusion 140, while the front end region 20A of the label 20 is positioned on the suction element 141.

[0150] In the second mode, the feed roller 11 decelerates to V immediately after the coating step. a min1, and the web 2 slides on the outer periphery of the conveyor turntable 14, so that the rear end region 20B and the front end region 20A of the label 20 that has just been glued are positioned at the cutting suction protrusion 140'' after the glued adhesive suction protrusion 140'' (therefore, the separation region 20S is positioned at the recess 140R of the cutting suction protrusion 140''). Simultaneously with repositioning, the speed V of the feed roller... a Reaching maximum speed V again a The feed roller 11 is immediately decelerated to V after the cutting step. a min2, and the web 2 slides on the outer periphery of the conveyor turntable 14, such that the rear end region 20B of the label 20 after the just-cut label and the front end region 20A of the next label 20 after that label 20 are positioned at the glue application suction protrusion 140'' after the just-cut cutting suction protrusion 140'', and the next cycle begins. In the second mode, each cycle includes a first step F11, a second step F12, and a third step F13, where the first step F11 includes a glue application step, in which the feed roller speed V a It is the maximum speed and equal to the speed V of the transfer turntable 14. t The second step F12 includes a repositioning step, in which the speed of the feed roller is changed from V. a max to V a min1, or vice versa, the third step F13 includes a cutting step, in which the feed roller speed V a It is the maximum speed and equal to the speed V of the transfer turntable 14. t Then, the cycle includes a fourth step F14, which includes a repositioning step in which the speed of the feed roller is changed from V. a max to V a min2, or vice versa.

[0151] Generally speaking, V a min1 and V a min2 can be the same, or V a min1 can be greater than or less than V. a min2.

[0152] At the same time, the central turntable 18 receives bottles 21 to be labeled from the delivery station 18A.

[0153] The suction element 141 draws the front end region 20A of the label 20 into the unloading region S, thereby applying the label 20 to the bottle 21 located on the central turntable 18. Finally, the labeled bottle 21 is conveyed to the delivery station 18B.

[0154] In embodiments where the cutting step is prior to the adhesive application step (i.e., the cutting area T is prior to the adhesive application area I), at least two possible methods may exist.

[0155] The first method (its steps are illustrated in the example below) Figures 9A to 9E In the second method (shown in the diagram), the cutting area T and the adhesive application area I are positioned such that the distance between them is greater than l (the length of the label 20) and preferably greater than L (the length of the arc between two successive suction protrusions 140). Figures 10A to 10D As shown in the diagram, the cutting area T and the adhesive application area I are positioned such that the distance between them is less than the length of the label 20 and less than L. In both the first and second methods, when the cutting step of the label 20 is completed, at the separation area 20S, the rear end area 20B of the label 20 is held on the transfer turntable 14 at the front extension 140T of the cut suction protrusion 140, while the front end area 20A of the label 20 is held on the transfer turntable 14 by a suction element 141 located in front of the cut suction protrusion 140 (in the rotation direction of the transfer turntable 14).

[0156] Therefore, during one work cycle including the cutting step and the labeling step, the transfer turntable 14 rotates at a constant angular velocity, such that the circumferential speed V of the transfer turntable is... t The value V is constant, while the feed roller takes a value of V during this work cycle. a =V a The minimum value V of min a The speed of min and the feed roller are taken as value V. a =V a The speed V changes between the maximum speed of max and its speed. a More specifically, the maximum speed of the feed rollers makes V a max=V t The minimum speed of the feed roller makes V a min <V t .

[0157] Therefore, when the speed V of the feed roller 11 a equals V a At max speed, the feed roller 11 imparts a speed V to the web 2 equal to that of the transfer turntable 14. t Movement speed.

[0158] Next, the feed roller 11 is decelerated to V. a min, then accelerate to return to V again a max. When it reaches V a max, with V a Run at maximum speed and decelerate to V. a The moment min and its re-reaching of V a The time between the moments of max is called the cycle period T. c As it decelerates to V a min、with V a Run at minimum speed, accelerate to V a The moment when max is reached and when it reaches V a The time interval between the moments of maximum deceleration is called the deceleration time interval T. dec During the deceleration time interval T dec In the middle, the rotational speed V of the feed roller 11 a Always less than the rotational speed V of the conveyor turntable t (In other words, the deceleration time interval T) dec It is V a min <= V a <V a The maximum time interval). More specifically, during the deceleration time interval T. dec In the middle, the web 2 slides relative to the outer periphery of the conveyor turntable 14.

[0159] In the first method (i.e., when the distance between the cutting area T and the adhesive application area I is greater than the length of the label), the feed roller 11 has a maximum speed V during the cutting step. a max, and during the deceleration time interval T dec The minimum speed V is in a min, the deceleration time interval T dec The timing is between the cutting step and the adhesive application step of label 20 within the same cycle (or between the cutting step of one label and the cutting step of the next label when the distance between T and I is greater than the length of the label). In the first method, the adhesive roller 12 interacts with the suction element 141 (to apply adhesive to the front end portion 20A of label 20) and with the suction protrusion device 140 to apply adhesive to the rear end portion 20B of label 20 at the front extension 140T. Therefore, after the cutting step, the feed roller 11 decelerates to a minimum speed V. a min, so that the cut label 20 moves at a speed equal to the circumferential speed V of the conveyor turntable 14. t The first part travels at a certain speed, while the rest of the second part decelerates to less than the circumferential speed V. tThis allows it to slide and position itself such that the separation region 20S is positioned at the recess 140R of the next suction protrusion 140 after the cut suction protrusion 140. During the deceleration time interval T... dec In this method, the front end region 20A of the next label 20 to be cut (not yet coated with adhesive) is positioned at the next suction element 141 after the cut protrusion 140. In the first method, during the deceleration time interval T... dec During this period, the cut labels 20 are processed at a speed of V. t As it travels, the cutting roller 12 interacts with the front end region 20A located at the suction element 141, and then with the rear end region 20B located at the front extension 140T of the cut suction protrusion 140.

[0160] In the first method, the rear extension 140C is operably retracted relative to the front extension 140T. For example, each suction protrusion 140 is asymmetrically shaped about an axis passing through its center, such that the rear extension 140C protrudes radially outward from the outer periphery of the transfer turntable 14 to a lesser extent than the front extension 140T. This prevents the applicator roller 12 from interfering with the web portion located at the rear extension 140C. In practice, during deceleration intervals, the web exposes the rear extension by sliding on the transfer turntable, and the retracted position of the rear extension relative to the front extension prevents the protrusion from being smudged with adhesive when it interacts with the applicator roller. Alternatively, the rear extension 140C can move radially between an extended position (in which it protrudes radially from the outer periphery of the transfer turntable 14 to the same extent as the front extension 140T protrudes radially from the outer periphery of the transfer turntable 14) and a retracted position (in which it protrudes radially from the outer periphery of the transfer turntable 14 to a less extent than the front extension 140T protrudes radially from the outer periphery of the transfer turntable 14).

[0161] In the second method (i.e., when the distance between the cutting area T and the adhesive application area I is less than the length of the label), the feed roller 11 has a maximum speed V during the cutting and adhesive application steps. a max, and during the deceleration time interval T dec The minimum speed V is in a min, the deceleration time interval T dec In terms of timing, this occurs between the gluing step and the cutting step of label 20 in the next cycle. In the second method, the gluing roller 12 interacts with a suction protrusion to apply glue to the areas of label 20 located at the front extension 140T and the rear extension 140C. Therefore, after the cutting step, the feed roller 11 maintains a maximum speed V. a Max continues until the adhesive application step, after which the feed roller 11 is reduced to the minimum speed V.a min, so that the cut and glued labels 20 move at a speed equal to the circumferential speed V of the conveyor turntable 14. t The web 2 travels at a speed that is less than the circumferential speed V of the conveyor turntable 14. t This allows it to slide and position itself such that the separation region 20S (i.e., the region between the rear end region 20B of the next label 20 to be cut and the front end region 20A of the next label 20 thereafter) is positioned at the recess 140R of the next suction protrusion 140 after the cut suction protrusion 140. Specifically, in the presence of the suction element 141, during the deceleration time interval T... dec In the middle, the front end area 20A (with glue applied) of the next label 20 to be cut is positioned at the next suction element 141 (with a radial protrusion less than that of the suction protrusion 140) after the cut suction protrusion 140.

[0162] Therefore, in the operating sequence of device 1, firstly, the feed roller 11 feeds the web 2 in continuous form to the transfer turntable 14 in the loading area C.

[0163] In the first method, when the cutting area T is located before the adhesive application area I, the web 2 is conveyed from the transfer turntable 14 to the cutting area T. In the cutting area T, the cutting roller 13 is synchronized with the transfer turntable 14, causing the cutter 130 to insert into the recess 140R of the suction protrusion 140 located between the front extension 140T and the rear extension 140C to separate the label 20. Specifically, the rear end region 20B of the label 20 is separated from the front end region 20A of the subsequent label (and then the label is cut in the separation area 20S). During the cutting step, the speed of the feed roller 11 is maintained at its maximum value. After the cutting step, the feed roller 11 is decelerated to V. a min. The newly cut label 20 travels along with the conveyor turntable 14, with its front end region 20A positioned at the suction element 141 before the cut protrusion device 140, and its rear end region 20B positioned at the front extension 140T of the cut protrusion device 140. The label 20 travels to the glue application area I, where the glue application roller 12 interacts with the suction element 141 to apply glue to the front end region 20A, and then interacts with the front extension 140T of the cut protrusion device 140. Simultaneously, the web 2 slides, positioning the front end region 20A of the label yet to be cut on the suction element 141 after the cut protrusion device 140, while the rear end region 20B is positioned on the protrusion device 140 behind it. After repositioning, the feed roller speed returns to V. amax, the next cycle begins. The separated label 20, located on the suction element 141 and the rear end region 20B on the front extension 140T, moves toward the unloading region S together with the transfer turntable 14.

[0164] Therefore, in the first method, there are a first step F1 and a second step F2, where the first step F1 includes a cutting step, in which the speed V of the feed roller is... a The maximum speed is equal to the speed V of the transfer turntable 14. t The second step F2 includes a repositioning step, in which the speed of the feed roller is changed from V. a max to V a min, or vice versa. In the first method, the rear extension 140C can be permanently in a retracted position relative to the front extension 140T, or it can be moved, for example, by a cam to a retracted position near the adhesive application area I.

[0165] In the second method, where the cutting area T is located before the gluing area I, (where cutting precedes gluing and the distance between T and I is less than the length of the label), the web 2 is conveyed from the conveyor turntable 14 to the cutting area T. In the cutting area T, the cutting roller 13 is synchronized with the conveyor turntable 14, causing the cutter 130 to be inserted into the recess 140R of the suction protrusion 140 located between the front extension 140T and the rear extension 140C to separate the label 20. Specifically, the rear end area 20B of the label 20 is separated from the front end area 20A of the subsequent label (and then the label is cut in the separation area 20S). The cut label 20 (followed by the web 2) travels together with the conveyor turntable 14 to the gluing area I. In the gluing area I, the gluing roller 12 applies glue to the rear end region 20B of the cut label 20 and the front end region 20A of the next label 20 to be cut. Specifically, during the gluing step, the rear end region 20B of the cut label 20 contacts the front extension 140T of the suction protrusion 140, and the front end region 20A of the next label 20 to be cut contacts the rear extension 140C of the suction protrusion 140. Throughout the cutting and gluing steps, the speed of the feed roller 11 is always maintained at its maximum value V. a After the adhesive application step, the feed roller 11 is reduced to V. a min, and the web 2 slides, so that the front end region 20A (with glue) of the label 20 to be cut is positioned at the suction element 141 after the protrusion device 140 where cutting and gluing have occurred, while the rear end region 20B (without glue) is positioned at the front extension 140T of the next suction protrusion device 140. Afterwards, the feed roller speed returns to V. amax, the next cycle begins. The separated label 20, located on the suction element 141 and the rear end region 20B on the front extension 140T, moves toward the unloading region S together with the transfer turntable 14.

[0166] Therefore, in the second method, each cycle includes a first step F1 and a second step F2. The first step F1 includes a cutting and gluing step, in which the feed roller speed V a The maximum speed is equal to the speed V of the transfer turntable 14. t The second step F2 includes a repositioning step, in which the speed of the feed roller is changed from V. a max to V a min, or vice versa. More specifically, note that during the deceleration time interval T... dec During this period, the rear end region 20B of label 20 and the front end region 20A of the label following label 20 are positioned on the suction protrusion 140, while the front end region 20A of label 20 is positioned on the suction element 141.

[0167] For completeness, note that an embodiment may also exist in which each suction protrusion device 140 includes a pair of suction protrusions 140 (each suction protrusion is divided into two extensions with a recess in between), specifically an adhesive application suction protrusion 140' and a cutting suction protrusion 140'. The adhesive application suction protrusion 140' is configured to interact with the adhesive application roller 12 during the adhesive application step, thereby performing a (second) adhesive application function. The cutting suction protrusion 140' is configured to interact with the cutting roller 13 during the cutting step, thereby performing a (third) cutting function. This aspect is illustrated by way of example. Figure 2B and Figure 11B As shown in the image.

[0168] A cutting roller 13 extends along a second axis between a first end and a second end, and includes a movement system 132 configured to move the cutting roller 132 about the second axis X2, and more specifically, to move the cutter 131 about the second axis X2. A coating roller 12 extends along a third axis X3 between a first end and a second end, and includes a movement system for moving it about the third axis X3. The first ends of the cutting roller 13 and the coating roller 12 lie in the same half-plane, which is perpendicular to the first axis X1 of the conveyor turntable 14 and cuts the conveyor turntable 14. The movement system 132 of the cutting roller 13 and the movement system of the coating roller 12 may be located at the same end (e.g., both at the first or second end), or at opposite ends (e.g., one system at the first end and the other at the second end, or vice versa).

Claims

1. A labeling device (1), comprising: - A feed roller (11) configured to feed a web (2) made of label material; - A transfer turntable (14) that rotates about a first rotation axis (X1) and includes a plurality of suction protrusions (140) that are angled along the outer periphery of the transfer turntable (14) and are provided with corresponding recesses (140R). - A cutting roller (13) rotates about a second rotation axis (X2) parallel to the first rotation axis (X1) and is provided with a cutter (130) for cutting the web (2) to divide the web (2) into web (2) segments that constitute the label (20). - A glue-applying roller (12) that rotates about a third rotation axis (X3) parallel to the first rotation axis (X1) and is configured to apply glue to the surface of the web (2), the glue-applying roller (12) and the transfer turntable (14) being configured to rotate in opposite directions; - The transfer turntable (14) is adapted to receive the web (2) from the feed roller (11) in the loading area (C), to hold the web (2) adhered to one or more suction protrusions in the suction protrusions (140), and to transport the label (20) to the unloading area (S), which is angularly spaced from the loading area (C) along the movement path of the web (2). The transfer turntable (14) is configured to interact with the glue roller (12) in the glue coating area (I) and with the cutting roller (13) in the cutting area (T), which are angularly located between the loading area (C) and the unloading area (S). The glue coating area (I) is located after the cutting area (T) relative to the movement path of the web (2). The adhesive roller (12) cooperates with the suction protrusion (140) of the conveyor turntable (14) to apply adhesive, and the cutter (130) of the cutting roller (13) is cyclically inserted into the recess (140R) of the suction protrusion (140) to cut the web (2).

2. The apparatus (1) according to claim 1, comprising an adhesive reservoir (121) configured to feed adhesive to the adhesive roller (12).

3. The device (1) according to claim 2, comprising a scraper (122) wherein the scraper (122) is located after the glue reservoir (121) in a rotational direction relative to the glue roller (12) to adjust the spreading of the glue on the outer surface (120) of the glue roller (12).

4. The labeling device (1) according to any one of the preceding claims, comprising a control unit connected to the adhesive roller (12) and the conveyor turntable (14) to synchronize their respective rotations.

5. The apparatus (1) according to any one of the preceding claims, wherein the coating roller (12) includes an outer surface (120) having a plurality of ridges and / or grooves to define a knurled surface, or the outer surface (120) defining alternating grooves and ridges.

6. The device (1) according to any one of the preceding claims, wherein each suction protrusion (140) includes a front extension (140T) and a rear extension (140C), the front extension (140T) being located in front of the rear extension (140C) in the rotational direction of the transfer turntable, and the recess (140R) being located between the front extension (140T) and the rear extension (140C).

7. The apparatus (1) according to claim 6, wherein the rear extension (140C) is operably in a retracted position relative to the front extension (140T) such that the glue roller (12) is configured to interact with the front extension (140T) to apply glue to the surface of the web (2) positioned at the front extension (140T).

8. The device (1) according to claim 7, wherein each suction protrusion (140) is asymmetrically shaped about an axis passing through the center, such that the rear extension (140C) protrudes radially from the outer periphery of the transfer turntable (14) to a lesser extent than the front extension (140T) protrudes radially from the outer periphery of the transfer turntable (14).

9. The device (1) according to claim 7 or 8, wherein the rear extension (140C) is movable between an extended position and a retracted position, wherein in the retracted position, the rear extension (140C) protrudes radially from the outer periphery of the transfer turntable (14) to a lesser extent than the front extension (140T) protrudes radially from the outer periphery of the transfer turntable (14).

10. The apparatus (1) according to any one of the preceding claims, wherein the coating roller is configured to interact with the suction protrusion (140) to apply adhesive to the surface of the web (2) located at the front extension (140T) and the rear extension (140C), and wherein the feed roller (11) has a maximum speed (V) during the cutting and coating steps. a max), and in time located between the glue application step and the label (20) cutting step in the next cycle (T dec The minimum speed (V) is in a min).

11. The device (1) according to any one of the preceding claims, wherein the glue roller is configured to interact with a suction element (141) to apply glue to the front end portion (20A) of the label (20) and to interact with a suction protrusion device (140) to apply glue to the rear end portion (20B) of the label (20) at the front extension (140T).

12. A labeling method, comprising the following steps: - The web (2), which is made of label material, is fed via a feed roller (11); - Provide a transfer turntable (14) that rotates about a first rotation axis (X1) and includes a plurality of suction protrusions (140) that are angled along the outer periphery of the transfer turntable (14) and are provided with corresponding recesses (140R). - The web (2) is divided into segments that constitute the label (20) by a cutting roller (13) which rotates about a second rotation axis (X2) parallel to the first rotation axis (X1) and is provided with at least one cutter (130) for cutting the web (2). - Adhesive is applied to the surface of the web (2) via an adhesive roller (12) which rotates about a third rotation axis (X3) parallel to the first rotation axis (X1), wherein the adhesive roller (12) and the transfer turntable (14) are configured to rotate in opposite directions; Via the aforementioned transfer turntable (14): - Receive the web (2) from the feed roller (11) in the loading area (C); - The web (2) is held to adhere to one or more of the suction protrusions (140), and the web (2) is moved along a movement path to an unloading area (S), which unloads the label (20) and is angularly spaced from the loading area (C) along the movement path of the web (2). The conveyor turntable (14) interacts with the cutting roller (13) in the cutting zone (T) and with the glue-applying roller (12) in the glue-applying zone (I), the glue-applying zone (I) and the cutting zone (T) being located at an angle between the loading zone (C) and the unloading zone (S), the glue-applying zone (I) being located after the cutting zone (T) relative to the movement path of the web (2). The adhesive roller (12) cooperates with the suction protrusion (140) of the conveyor turntable (14) to apply adhesive, and the cutter (130) of the cutting roller (13) is cyclically inserted into the recess (140R) of the suction protrusion (140) to cut the web (2).

13. The labeling method according to claim 12, comprising the following steps: - Glue is fed to the coating roller (12) via glue reservoir (121). - The spread of the adhesive on the outer surface (120) of the coating roller (12) is adjusted by a scraper (122), the scraper (122) being mounted behind the adhesive reservoir (121) relative to the rotational direction of the coating roller (12).

14. The method according to claim 12 or 13, wherein each suction protrusion (140) includes a front extension (140T) and a rear extension (140C), the front extension (140T) being located ahead of the rear extension (140C) in the rotational direction of the transfer turntable, and the recess (140R) being located between the front extension (140T) and the rear extension (140C).

15. The method of claim 14, wherein at least during the adhesive application step, the rear extension (140C) is operably in a retracted position relative to the front extension (140T) such that the adhesive roller (12) interacts with the front extension (140T) to apply adhesive to the surface of the web (2) positioned at the front extension (140T).

16. The method of claim 15, wherein at least one of the following conditions is met: - Each suction protrusion (140) is asymmetrically shaped about an axis passing through the center, such that the rear extension (140C) protrudes radially from the outer periphery of the transfer turntable (14) to a lesser extent than the front extension (140T) protrudes radially from the outer periphery of the transfer turntable (14). - The rear extension (140C) is movable between an extended position and a retracted position, wherein in the retracted position, the rear extension (140C) protrudes radially from the outer periphery of the transfer turntable (14) to a lesser extent than the front extension (140T) protrudes radially from the outer periphery of the transfer turntable (14).

17. The method according to any one of claims 14 to 16, wherein the coating roller (12) interacts with the suction protrusion device (140) to apply adhesive to the surface of the web (2) positioned at the front extension (140T) and the rear extension (140C), and wherein the feed roller (11) has a maximum speed (V) during the cutting and coating steps. a max), and in time located between the glue application step and the label (20) cutting step in the next cycle (T dec The minimum speed (V) is in a min).

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