Abstract: A system is disclosed for additively manufacturing a composite structure. The system may include a support, and a print head operatively connected to and moveable by the support. The print head may include a supply of continuous reinforcement, an outlet configured to discharge the continuous reinforcement, and a tensioning module disposed between the supply and outlet. The tensioning module may be configured to generate a signal indicative of a tension in the continuous reinforcement. The system may also include a processor programmed to selectively cause the supply to dispense the continuous reinforcement based on the signal.

Abstract: A hand-held or table-mounted tool for adhering a flooring edge finish to a flooring edge. The hand-held tool includes a main body, which can include a handle, a base, and a bi-level soleplate, which is heated during application to adhere a flooring edge finish to a flooring edge. The soleplate of the tool can be made of polymer, carbon, metal, ceramic, glass, or a mixture thereof.

Abstract: The present invention relates to a method for determining the oscillation amplitude of a sonotrode excited by a converter, wherein the converter is connected to a current generator and the current IE(t) provided by the current generator and flowing through the converter is measured. According to the invention, in order to provide a method for determining the oscillation amplitude of a sonotrode excited by a converter, the voltage UE(t) applied to the converter by the current generator is measured and the oscillation amplitude of the sonotorode or a field quantity of the electrical oscillation system comprising the current generator and the converter, said field quantity being related to the oscillation amplitude of the sonotrode, is calculated from the measured voltage UE(t) and from the measured current IE(t).

Abstract: A launcher assembly includes an outer housing that supports aprons and a nozzle. The nozzle and apron are removable from the base to aid in set up and preparation. Rollers are mounted to ends of the base to aid movement through a sewer pipe. One end of the launcher includes an opening slot for receiving an extended end of the liner. A bladder is banded to a nozzle for inverting the liner. The launcher is held in place by a separately inflatable bellows and pillow. Cameras are mounted to the launcher to provide at least one image on a remote display to aid alignment and installation.

Abstract: The technology provides for alignment of forming positions of glazing gaskets formed on both front and rear sides of a glass panel. After the glazing gasket has been formed on the multilayer glass panel, a first distance L1 is measured from the reference member to the glazing gasket. After the multilayer glass panel has been reversed and positioned at the reference position for the glass panel, a second distance L1? is measured from the reference member to the glazing gasket. An offset amount of the forming position of the glazing gasket on the rear side of the multilayer glass panel is determined from the difference of the first distance L1 and the second distance L1?. An application starting position of the application nozzle when forming the glazing gasket on the rear side of the multilayer glass panel is corrected based on the offset amount.

Abstract: A portable, handheld, light-weight device for sealing seams between adjacent sheets of flooring in which a seam following guide is incorporated as an inseparable part of the body of the handheld device. The guide has a pair of laterally separated rollers carried by a roller mounting that has a narrow, seam following element located midway between the rollers. A support on the body may be extended to hold a sealant dispensing tip out of contact with the adjacent sheets of flooring, or collapsed to allow the tip to contact the adjacent sheets of flooring that are to be sealed together with sealant therebetween. An electrically powered propulsion system drives the rollers and is operable to automatically advance the device along a seam as sealant is discharged into it. Alternatively, the device can be manipulated manually with the propulsion system disabled for use in detail work.

Abstract: A portable impulse welding assembly operable by an operator with a main air regulator receiving pressurized air for decreasing or maintaining air pressure to a first preset limit. A splitter simultaneously divides a first regulated air into first and second portions and a rod air regulator provides a first valve air to a first air flow conduit and a second air flow conduit. A pair of pneumatic cylinders mounted in the housing, each pneumatic cylinder having a rod, the pneumatic cylinders selectively receive air from the first air flow conduit to extend each rod from each pneumatic cylinder or receive air from the second air flow conduit causing each rod to retract into each pneumatic cylinder and a controller to control seal times and cool times and a laser pointer to ensure sealing accuracy.

Abstract: A manual and an automatic fastening device for fastening a bonding element to a surface by means of a light-curing adhesive is disclosed. The fastening devices apply the bonding element to the surface with a specific contact pressure, before the light is irradiated onto the bonding element for curing the adhesive. As the bonding element consists of transparent material, the adhesive is cured between the fastening element and the surface.

Abstract: A rotary lamination apparatus includes a die, a punch, a rotation drive source, a mounting table, at least one proximity sensor, and a determining device. The punch punches core pieces from a thin plate material. The rotation drive source drives and rotates the die about the central axis of the die. The mounting table is arranged in the inner space formed by the die. The core pieces are rotated and laminated on the mounting table. The proximity sensor detects whether the die is in the proximity of a predetermined position in a non-contact manner after the die has stopped rotating. The determining device determines whether the die is stopped at the predetermined position based on a detection result from the proximity sensor.

Abstract: A masking device capable of effectively carrying out a masking operation using a masking jig by means of a robot. A step S5, wherein the masking jig is taken out by a second robot, must be completed prior to step S6, and may be carried out until step S2 has been completed, otherwise, may be carried out concurrently with step S4. Since the taking out operation of the masking jig by the second robot may be concurrently with the detecting/taking-out operation of the workpiece or the applying operation of adhesive by the first robot, cycle time may be reduced.

Abstract: A laminating apparatus (200) for laminating a substrate foil (SF) with a laminating foil (LF) comprises a first and a second facility (210, 214) for providing the substrate foil and the laminating foil respectively, a recognition facility (224, 225) for determining a location of at least one feature of at least one (LF) of the laminating foil and the substrate foil and an alignment facility (252, 253) for aligning the at least one (LF) of the foils, a separation facility (240) for separating a portion (SF1; LF1) of the at least one of the foils after it is controlled by the alignment facility, a laminating facility (250, 252) for laminating the separated portion of the at least one of the foil against the other one of the foils.

Abstract: A device for transferring labels in a labeling machine with at least two retaining elements for holding labels, with the retaining elements being mounted offset in the circumferential direction around a gripper cylinder axle, and a mechanical control means configured to change the relative speed between the retaining elements in the circumferential direction of the gripper cylinder.

Abstract: In a masking system a robot performs first conveyance work of making an object gripping unit grip an object and set the object at a predetermined position based on positional information of the object which was detected by a first detection unit, coating work of making a coating unit coat an adhesive on a masking location of the object which is set at the predetermined position, and second conveyance work of making a masking piece gripping unit adhere a masking piece to the masking location of the object based on positional information of the masking piece which was detected by a second detection unit.

Abstract: Apparatus for connecting at least two plates (1, 2) of which a supporting plate (1) comprises a higher strength than a supported plate (2) posed thereon. By means of a connecting element (5) rotated by a rotational feeder unit (11), the connecting element with a collar (6) presses the supported plate (2) onto the supporting plate (1). With a shaft (10) a friction welding connection to the supporting plate (1) is made. The rotational feeder unit (11) is provided with a measurement device with measures an axial force exerted by the rotational feeder unit as well as a respective feeding motion and which indicates, upon abutment of the shaft of the connecting element onto the supporting plate, the pressure increase encountered therein, which, thereby, advances the rotational feeder unit, the feeding motion of which is adjustable to at least three sequential connecting stages.

Abstract: A label and label attaching device for attaching a label onto a backing sheet. The label has a protruding apex portion, side surfaces defined when the label is folded at the apex and end portions at the outer base ends of the side surfaces. A label sheet is formed by temporarily attaching labels to a backing sheet. Prior to attachment, an intermediate portion of the label protrudes from its back surface to its front surface in a folded chevron shape. Outer end portions of the side surfaces project out from the side surfaces and the outer end portions are temporarily attached to the backing sheet with the folded portion protruding. The attaching device has two divided bodies to which the outer end portions are temporarily attracted. The divided bodies are movable together and apart to define the folded label. Then the label holding unit moves the folded label to an attaching position on the backing sheet which is moving past.

Abstract: A labeling applicator having a suction plate (21) including a pair of divided bodies (21b, 21c) movable relatively to two positions, i.e., a contact position (S) where the opposing end faces facing each other move toward contact while sucking a first surface side of a label (L) to which an RFID tag is attached and a separated position (V) where the opposing end faces are separated from each other, wherein a portion (2) of the label (L) is folded in a peak by the end faces of the divided bodies (21b, 21c) facing each other as a divided body (21c) moves, thus forming a folded portion (M) having a bend or curved position (7) on the proximal end, before labeling an article (W). A non-abutting portion (20) is provided by cutting the edge of each split body (21b, 21c) corresponding to the bend (7) on the proximal end of the folded portion (M) such that the end faces of the divided bodies (21b, 21c) do not abut when the end faces move toward contact.

Abstract: A die bonder is provided comprising a bond head including a collet for picking up a die and bonding the die at a bonding site. The die bonder further comprises a first motor which is connected to the collet by a shaft for driving the collet in driving directions towards and away from the bonding site and a second motor which is connected to the bond head for driving the bond head in directions parallel to the driving directions of the first motor. A rotary motor is also operatively connected to the collet for rotating the collet about a rotational axis that is parallel to the driving directions of the first motor. The shaft is slidably connected to the rotary motor and is slidable relative to the rotary motor when it is driven by the first motor to move.

Abstract: Provided are an optical display device manufacturing system and an optical display device manufacturing method which can more preferably carry out a defect inspection. A detection condition of a defect in the inspection of an optical film before being bonded to an optical display unit carried out by a defect inspection apparatus (14, 24) is corrected based on the result of inspection of the optical display device with the optical film bonded, carried out by an inspection apparatus (30), and the optical film including the defects detected by the defect inspection apparatuses (14, 24) based on the corrected detection condition are excluded.

Abstract: A method for controlling a labelling device, that is part of a block system including a supply device for supplying articles to be labeled, includes supplying, by the supply device, a predetermined number of the articles such that the labelling device and the supply device are each operated at a first operating speed. The predetermined number of the articles are delivered, in an automated manner, to the labelling device. A drive of the labelling device is decoupled from a corresponding drive of the supply device. The labelling device is then operated at a second operating speed.

Abstract: A surrogate patch assembly for a rework area of a structure comprises a surrogate patch body which may be formed of a material for drawing moisture from the rework area. The patch assembly may include a sensor mounted to the surrogate patch body. The sensor may comprise a thermal sensor for sensing the temperature of the rework area and the surrogate patch body. The sensor may comprise a moisture sensor for sensing moisture drawn into the surrogate patch body.

Abstract: A sheet peeling apparatus 10 includes: a sticking means 14 for sticking a peeling tape PT by pressing the peeling tape PT onto an adhesive sheet S; a moving means 15 for moving the peeling tape PT stuck to the adhesive sheet S and a holding means 11 for holding a wafer W relative to each other to peel the adhesive sheet S; a detecting means 17 for detecting the position of the outer periphery of the adhesive sheet S, and outputting a signal thereof; an input means 18 for inputting a correction value; a controlling means 19 for determining a pressing position of the peeling tape PT to the adhesive sheet S based on the output signal from the detecting means 17 and the correction value, and controlling the moving means 15 so as to stick the adhesive sheet S at the pressing position.

Abstract: A method and apparatus for assembling a plurality of independently formed solid components is provided thereby forming a single delivery vehicle for a pharmaceutical or pharmaceutical-like product. The solid components can be held and fed to the apparatus via a plurality of magazines. Pusher rods and the like can be used for positioning each of the solid components. Where the components are connected via a bonding liquid, a sprayer is provided and compression pins or the like press the components with the bonding liquid together to form the final product. A rivet or other connection structure can also be used and driven through holes in each of the solid components to form the final product.

Abstract: A jamming detection method and a sheet laminating apparatus using the jamming detection method are provided. The sheet laminating apparatus includes a laminating channel, a laminating roller assembly, a distance sensor, a document sensor and a controller. The distance sensor is used for measuring a moving distance of a document. The document sensor is used for detecting a transmitting status of the document. According to the moving distance of the document and the transmitting status of the document, the controller discriminates whether a jamming condition of the sheet laminating apparatus occurs.

Abstract: A labeling and preparation device for test tubes. At least one storage section places at least one pallet having a set of test tubes at a preset position. At least one transfer section is disposed above the storage section, and clamps or releases one of the test tubes. A labeling section is disposed below the transfer section, receives the test tubes transferred from the transfer section, and attaches a label having information related to a sample on a circumference of each test tube. An ejection section is disposed below the labeling section, and ejects the test tubes to an outside. A controller controls drivers of the transfer section, the labeling section and the ejection section.

Abstract: A postage label dispensing system for dispensing adhesive-backed labels includes a conveyance system for displacing a supply of label material along a feed path wherein the label material includes a face material having an adhesive backing and a liner material detachably bonded to the adhesive backing. The adhesive backing defines a pair of longitudinal adhesive strips and a non-adhesive region disposed therebetween. The liner material has a longitudinal cut disposed adjacent to, and aligned with, the non-adhesive region to define a pair of liner strips. A peeler plow is disposed downstream of a bending means which induces a bend in the label material along an axis substantially parallel to the longitudinal cut, i.e., in an area corresponding to the non-adhesive region, which bend produces an opening between the face material and the liner strips.

Abstract: A vibration welding system has a pair of electromagnets coupled to a first workpiece support for effecting reciprocating movement of the first workpiece support relative to a second workpiece support, and an electrical drive system coupled to the electromagnets for successively energizing and de-energizing the electromagnets out of phase with each other to effect the reciprocating movement of the first workpiece support.

Abstract: A system is configured to process steam. The system includes a steam supply line, a corrugator system, a heat sink, and one or more return lines. The corrugator system includes two corrugating rolls. The corrugating rolls each have a plurality of bores formed therethrough. The bores extend substantially longitudinally through the corrugating rolls. The heat sink is configured to draw steam through the corrugator system. The one or more return lines are in fluid communication with one or both of the corrugator system or the heat sink. The one or more return lines are configured to receive condensate communicated from one or both of the corrugator system or the heat sink. A steam trap assembly may also be positioned between the heat sink and a return line. The steam trap assembly may include a steam trap and a bypass line that is operable to selectively bypass the steam trap.

Abstract: Provided are a method of manufacturing an optical display unit and a manufacturing system of the optical display unit wherein in the case of sticking an optical film to an optical display substrate, a defective optical film is eliminated optimally and precision of the elimination can be confirmed.

Abstract: A label applicator system transfers labels from a web to items moving on a rotary item transport. The applicator system includes a supply for supplying the web with the labels thereon and a take-up for taking up the web after transfer of the label from the web to the item. The supply and take-up are vertically oriented. The applicator includes a movable label applicator head. A rotary table moves the items along a path defined by rotation of the table and rotates the items relative to an axis of the items. The label applicator head is movable toward and away from the item and the item is rotated to apply the label to the item as it moves passed the applicator head.

Abstract: The present invention refers to a process and an apparatus for combination of steel tubes or pipes with plastic linings, in which steam is used as heat carrier to heat the steel tubes or pipes lined with linings. The apparatus comprises a multifunctional combining chamber, a multifunctional carriage for conveying tubes or pipes, an arrangement for steam circulating, which continuously supplies re-usable steam, a cooling and shaping arrangement and a controlling device. The steam circulating system comprises a furnace for re-heating the steam and means for supplying supplementing steam. The percentage of passing the qualification control is increased up to 99.9% by embodiment of the method and/or apparatus according to the present invention, while it is only 97% by a conventional apparatus, and the production capacity is increased by 15%.

Abstract: A system and a method for continuously manufacturing a liquid crystal display device, which can suppress the occurrence of stripe defects, are provided, and the system includes carrier film feeding means; peeling means for peeling off a sheet piece of a polarizing film and a pressure-sensitive adhesive from a carrier film; take-up means for taking up the carrier film; bonding means for bonding the sheet piece to a liquid crystal panel with the pressure-sensitive adhesive interposed therebetween to form a liquid crystal display device; and speed control means for controlling the take-up means and the bonding means so that the carrier film can be folded back while it is allowed to protrude from the front end of the peeling means toward the bonding means at least at a peeling-off end time when peeling off the sheet piece from the carrier film is completed.

Abstract: A device for positioning the conveyor belt running through machines for thermal treatment of filaments, essentially constituted by a pressurized chamber (1) traversed by a conveyor belt (2) enclosed at each end by a sealing head mounted on a frame or movable door (3) connected to the pressurized chamber (1) by a bellows (4), each sealing head including a head of horizontal superposed rollers (5, 6) which are pressed against the opposite surfaces of the conveyor belt (2). The device includes a positioning elements (8) and a position control elements (9) acting on a very short region immediately adjacent each sealing head. The invention is more particularly applicable in the field of the textile industry, in particular of the field of treating filaments by elements of thermal treatment machines currently called heat setting machines.

Abstract: A composite wood product and its method of manufacture. The wood product comprises aligned, substantially straight wood strands cut from veneer, disposed side by side lengthwise in substantially parallel relationship with adhesive bonding together the strands. The product is produced in a billet having a width in the range of about 3 ft. to 12 ft. and with a thickness in the range of about 1.1 inches to 2 inches. The strand ends are distributed in a specific pattern that approximates maximizing the minimum distance between strand ends. The wide sides of the billet are coated with a dark colored resin. The billet may be sawn lengthwise into sizes used for joists and rafters. Such a sawn product (e.g. 1.5? by 9.25?) has the wide sides a dark resin color and the narrow sawn sides mostly wood colored. The strands are parallel to its length.

Abstract: An apparatus for high speed labeling of produce including a turret which carries label depositor arms and continuously rotates so that its fully extended tangential speed matches the produce conveyor speed. The label depositor arms are reciprocated along a predetermined path by a mechanical linkage. A supply of pressurized air and vacuum are selectively delivered to the label depositor arms to pick-up a print-on-demand label and adhere it to the produce. One or more rotating turrets are included within a system for high speed labeling. The system monitors a common shaft which drives a conveyor that moves multiple lanes of produce under corresponding turrets. A conveyor offset signal in combination with a printer offset control, allows the system to independently synchronize the high-speed labeling operation at each lane.

Abstract: The present invention relates to an apparatus for conforming a functionalized flexible planar film on an optical lens. The apparatus according to the invention may also be used in a process of functionalization of an optical lens. As a factor of the functionalization that one wishes to introduce into said optical lens and the nature of the functionalized flexible planar film used, the functionalization process is a process of gluing, transfer, or molding of a functionalized flexible planar film onto an optical lens. The implementation of each of these respective processes makes it possible to obtain a functionalized optical lens, said functionalization being adhered, transferred, or molded using a functionalized flexible planar film.

Abstract: A device and a method, in particular for labeling containers, in particular bottles, having a corresponding conveyor device, several equipment units, in particular labeling units, and a controller as well as a control console for controlling certain unit functions. To ensure reliable operation of the device, the control console is arranged to be variable in position and at least one position detector is provided, whereby the controller enables or blocks certain functions in a safety-oriented manner as a function of the position of the control console.

Abstract: A laminating apparatus having a thickness-detecting function is provided. Before the laminating operation is done, the thickness of the article to be laminated is detected by a thickness detecting mechanism of the laminating apparatus. According to the detected thickness, the temperature or the rotating speed of the heating roller of the laminating apparatus is dynamically adjusted.

Abstract: This document describes the methodology for laminating layers of converted materials to form a precision laminated multilayered structure. With this methodology the pattern in the next layer to be laminated to create the multilayered structure can be adjusted based upon first or prior layer that the next layer is to be laminated to. The next layer will then be precisely aligned to the first or prior layers creating a precision laminated multilayer structure.

Abstract: A labeller includes a waste liner rewind wheel for taking up the release liner after it has been separated from the labels, and a print mechanism positioned along the label path for real-time printing of a desired print material on the labels. In one embodiment, the waste liner rewind wheel includes a mechanism for adjusting the speed of the rewind wheel as the amount of waste liner on the rewind wheel increases, while maintaining sufficient tension on the waste liner to pull the waste liner onto the rewind wheel. In another embodiment, the print mechanism is mounted to the frame along the label path, such that the print mechanism is capable of printing on the labels as they are moved past the print mechanism. The labeller may additionally include an encoder for registering the position of the label web with respect to the print mechanism.

Abstract: Each platform mounted mold assembly for plastic tubing includes a circuit board containing parameters defining elements of the forming, molding, tipping or welding operation to be undertaken on the tubing. A control unit includes an RF generator for providing the RF energy to effect the forming, molding, tipping or welding process, a source of air under pressure to operate the mechanical elements attendant each mold assembly, various sensors and a multiplex unit. In operation, the control unit serially addresses each of the mold assemblies, senses the parameters attendant the mold and applies the appropriate power level of RF energy for a specific duration and temperature while activating the mechanical aspects of the mold assembly. The mold assemblies may be serially activated through a multiplex unit or in a particular sequence that may be operator controlled.

Abstract: A method and an arrangement for the production of composite work pieces of layers laminated to each other, with at least one layer representing a glass plate. First, at least one composite work piece is laminated in a lamination press under the effects of pressure and heat in order to at least activate the adhesive material used for lamination. Then the composite work piece is removed from the lamination press and transported into a curing station and/or cooling station for curing and/or cooling. A testing device for detecting broken glass in the composite work piece is arranged between the lamination press and the curing station or between the lamination press and the cooling station, which detects potentially present broken glass by testing the inherent stability of the composite work piece.

Abstract: A horizontal hotpress system is provided, which can maintain the thickness of the boards (laminated boards) after hot-pressing within the allowable range, by driving and controlling the press cylinders individually, even when, for example, the size or material of the boards changes. Also, A horizontal hotpress system is provided, which can maintain the thickness of the boards (laminated boards) after hot-pressing within the allowable range, by driving and controlling the press cylinders individually or jointly without adjusting the pressing positions of the press cylinders, even when, for example, the size or material of the boards changes, and further, being able to adapt to change of the material of the boards or the like.

Abstract: A labeler is supported on a frame and includes a waste liner rewind mechanism. The frame may be a two-piece frame, wherein each piece supports a plurality of labeler components. A waste liner rewind wheel is rotatably mounted on one of the frame members, and is capable of supporting the release liner of the label web after the labels have been removed and applied to items. A rewind drive is connected to the waste liner rewind wheel for advancing the waste liner rewind wheel to wind the release liner about the waste liner rewind drive wheel. The rewind mechanism actuates the rewind drive as a function of the amount of tension on the release liner. The labeler may also include a print mechanism positioned along the label web path for printing a desired printed information on the individual labels.

Abstract: A method is provided for configuring a mailpiece creation system to minimize system set-up, mitigate errors and reduce the skill level required to perform tabbing operations. The method includes the steps of (i) determining a fold configuration of the sheet material employed in the creation of a mailpiece, (ii) determining the dimension of an adhesive tab for securing a free edge of the sheet material, (iii) determining a target location for the placement of each adhesive tab relative to the free edge of the folded sheet material, (iv) configuring at least one system parameter of the mailpiece creation system in accordance with at the fold configuration, adhesive tab dimension, and/or target location, and (v) executing a mail run job by the mailpiece creation system.

Abstract: When a label on a conveyor belt is detected, there is performed a label sticking process of making a sticking mechanism take out the label and stick it to an article at a predetermined position, while when a defect of the label on the conveyor belt is detected before detecting the label, the label is sent out to a label recovery position without performing the label sticking process.

Abstract: Adhesive labels are applied to a continuous strip by a unit fed with a first continuous strip of wrapping material advancing along a first path, and a second continuous strip of backing material presenting a succession of labels and advancing along a second path. The labels are detached singly from the second strip by a diverter blade placed along the second path and presenting a sharp edge over which the backing strip is routed through an acute angle to induce the separation of the labels.

Abstract: A tissue manufacturing/handling device is provided. The device comprises a reel turn-up section including a tissue reeling station and an adhesive application system. The tissue reeling station is configured to provide a tissue spool in the path of an advancing tissue web. The adhesive application system is configured to apply a turn-up adhesive to the advancing tissue web or the tissue spool and comprises an adhesive spray rack. The spray rack comprises at least one adhesive applicator nozzle coupled to an adhesive manifold via an adhesive valve assembly. The spray rack comprises a rotation mechanism configured to permit reciprocal rotation of the spray rack about an axis substantially parallel to the spray rack axis between a spray position and at least one maintenance position. Additional embodiments are disclosed and claimed.

Abstract: A fluid enveloping device includes a housing having a vacuum chamber; a valve for blocking off the communication of the vacuum chamber and atmospheric environment; a vacuum pump module connected to the vacuum chamber for extracting air until the vacuum chamber is close to a vacuum state; a die holder for locating a lower thin film and receiving the fluid at the lower thin film; a punch holder for locating an upper thin film; and a sealing nip in the vacuum chamber for hot-pressing the upper and the lower thin films to envelope the fluid therein.

Abstract: The present invention provides a sheet laminating apparatus with a jamming-detection mechanism. A sensing element is disposed beside the roller for detecting whether a plastic film is adhered onto the roller during the laminating operation. When the jamming phenomenon occurs, the roller is reversely rotated to eject the jammed sheet article.

Abstract: A laminating device includes first and second rollers, a motor, a first drive element associated with the motor and configured to be driven thereby, a second drive element associated with at least one of the rollers, and adapted to engage the first drive element so that the motor may drive the rollers to rotate in respective first directions, and a support arrangement which at least partially supports at least one of the rollers and the second drive element. The support arrangement is movable with respect to the first drive element between a first position, in which the first and second drive elements engage one another, and a second position, in which the first and second drive elements are disengaged from one another, allowing rotation of the rollers in respective second directions without this motion being transmitted to the motor.