Abstract: A roll of a continuous web of an optical film laminate with predefined slit lines for use in a continuous manufacturing system by laminating optically functional film sheets to liquid-crystal panels. The optical film laminate with predefined slit lines comprises an optically functional film having an adhesive layer which is subjected to a preliminary inspection, and a carrier film releasably laminated to the adhesive layer. Defect-free normal sheets and defective or defect-containing sheets having predefined length corresponding to the dimension of the liquid-crystal panel are formed on the carrier film by sequentially forming slit lines along the transverse direction with respect to the lengthwise direction of the optical film laminate.

Abstract: There is disclosed a configurable modular labeling machine and a method of making same. The machine can be selectively assembled in a number of different configurations. The machine has a frame or housing that can mount selectively positionable applicator and rewind modules. The applicator module includes a plate that can carry direction-changing and feed rolls and can mount a dispensing mechanism. The rewind module can include a plate that can mount direction-changing rolls and a rewind.

Abstract: A manufacturing device of a stereoscopic image display panel includes a first unit for transferring a display panel provided in a display panel preparation space to an attachment space, a second unit for transferring a control film provided in a control film preparation space to the attachment space, and a drum unit positioned in the attachment space. The drum unit adsorbs the control film transferred to the attachment space by the second unit in a non-vacuum manner and rotates so as to attach the control film to a display surface of the display panel.

Abstract: An insulated glass secondary edge sealing device that dispenses sealant to insulated glass units including at least two panes of glass separated by a spacer, including a fixed sealant dispensing head, a table that supports the insulated glass units, a fence, a depth sensor, a linear motion encoder, a metering device. The sealant dispensing head has a dispensing nozzle and a corner dam. The dispensing nozzle includes a floating insulated glass unit contact surface and the corner dam is shiftable between a retracted position and an extended position. A control unit receives signals from the depth sensor and the linear motion encoder and controls the metering device to dispense a measured flow of sealant based on the depth of the inset of the spacer and the movement of the insulated glass unit parallel to the fence and relative to the encoder.

Abstract: An electrostatic chuck includes an array of independently biased conductive chuck elements, an array of sensor-conductor assemblies, and/or a combination of an array of sensor-conductor assemblies and at least one motorized chuck. Conductive chuck elements, either standing alone or embedded in a sensor-conductor assembly, are independently biased electrostatically to compensate for bowing and/or warping of a substrate thereupon so that the substrate can be bonded with a planar surface. A single electrostatic chuck can be employed to reduce the bowing and warping of one of the two substrates to be bonded, or two electrostatic chucks can be employed to minimize the bowing and warping of two substrates to be bonded.

Abstract: The operation of tow cutters in an automatic fiber placement machine are monitored to determine if inconsistencies in fiber placement are related to cutter operation. A machine vision system detects inconsistencies in tow placement, and timing signals are generated that represent the actuation of the cutters. The timing signals are correlated with recorded images of the placed tows to determine if the inconsistency in tow placement is related to cutter operation.

Abstract: This disclosure discloses a tag label producing apparatus comprising: at least one feeding roller; a printing device; and an apparatus antenna; and a coordination control portion that controls in coordination the feeding roller, the printing device, and the apparatus antenna, such that information transmission/reception is performed between an RFID circuit element and the apparatus antenna when an IC circuit part of the RFID circuit element provided to a tag medium is fed downstream in a transport direction from a segment from a nearest roller to the apparatus antenna along a feeding path.

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 pallet is made from thermoformed polymeric sheets with an attached communications device. A further aspect of the present invention includes a radio frequency identification device attached to an apparatus. In still another aspect of the present invention, a communications device is incorporated into one or more sheets of a pallet or other container prior to forming. Methods of making and using a thermoformed pallet and container having a communications device are also provided.

Abstract: An active anvil assembly for use in forming a looped suture is provided. The active anvil assembly includes an anvil member, a first sensor operably connected to the anvil member, and a control assembly. The first sensor is configured for measuring at least one of force, torque, and distance feedback. Also provided are systems and methods for forming a looped suture including an active anvil assembly.

Abstract: A seal agent D and liquid crystal C are clamped to a lower substrate 6, a pair of the lower substrate 7 and an upper substrate 7 are laminated with the seal agent D and the liquid crystal C interposed therebetween, and at least one of the pair of substrates is a roll-shaped long flexible resin film. When the substrates are laminated, the lower substrate 6 on one hand is aligned to the upper substrate 7 on the other hand in every arbitrary length. With this arrangement, productivity can be improved as well as a positional dislocation due to accumulation of positioning errors can be prevented.

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: 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: A continuous manufacturing method and system for liquid-crystal display elements which enhances accuracy, increases speed and improves in yield in the continuous production of liquid crystal elements. The continuous method and system performs steps of, defining a plurality of defective and normal-polarizing-sheet slitting positions on a continuous web of optical film, based on positions of defects existing in the optical film, and applying only normal polarizing sheets to a liquid-crystal panel. The polarizing sheet includes the defective and normal-polarizing-sheet slitting positions recorded as encoded information which is used to determine whether the polarizing sheet defined between slit lines sequentially formed in the continuous web, is a normal polarizing sheet, peeling the normal polarizing sheet from the carrier film and applying the normal polarizing sheet to the liquid-crystal panel.

Abstract: An apparatus for applying labels to products includes a label application station at which the labels are applied to a product and an application head movably mounted relative to a base for movement between a first operative loading position spaced from the label application station and a second operative application position at which the application head applies at least one label to a product positioned at the label application station. An electrically actuated solenoid is operatively connected to the application head to move the application head between the first and second operative positions.

Abstract: The invention relates to a method for contacting a flexible sheet to a first element with improved lateral alignment. The method includes a step of measuring a first lateral misalignment after establishing a first contact between the flexible sheet and either of the first element and a sheet parking surface called anchor in the first stage. If the 5 misalignment exceeds a predetermined threshold the flexible sheet is parked at the anchor such that it is not in contact with the first element, and the relative position of the first element and the anchor is altered during the second stage for correcting the mismatch during a contact between the flexible sheet and the first element to be established within the next step of the method. During the steps of shifting the contact point to obtain the second stage 10 the contacting process is more accurate and reproducible than the process for establishing the initial contact.

Abstract: A method for positioning an article within a label applicator and securing the article between a first roller, a second roller, and a moveable contact member includes securing the article by moving the moveable contact member from a first position in which the moveable contact member is not in contact with the article to a second position in which the moveable contact member is in contact with the article. A label is received for application to the article by delivering the label between the article and at least one of the first roller, second roller, and the moveable contact member.

Abstract: The method for forming a laminate of the present invention is a method for forming a laminate, comprising a silane coupling agent treatment step of applying an aqueous solution of a silane coupling agent onto a surface of a metal layer, and drying the resultant applied film to form a silane coupling agent coating, and a lamination step of laminating a resin layer on the silane coupling agent coating, these steps being continuously performed, wherein when the formed silane coupling agent coating is analyzed in the silane coupling agent treatment step by FT-IR with a reflection absorption spectrometry and then the peak area of Si—O is turned to a value less than a predetermined threshold value, at least one part of the aqueous solution of the silane coupling agent is renewed, thereby conducting the silane coupling agent treatment while the peak area is controlled into a predetermined range.

Abstract: A lay-up apparatus lays first and second strips of tape 101, 102 on top of two electrodes 5, 6 deposited on a photovoltaic device panel 1. The strips of tape are unwound by first and second grippers 112, 122 and cut to predetermined lengths by first and second cutters 113, 123. The cut strips of tape are laid one on top of the other and transported by rotatable moving means 130. The moving means 130 rotates in opposite directions when laying the strips of tape it holds from the electrode 5 toward the electrode 6 and when laying the strips of tape from the electrode 6 toward the electrode 5, while using one end of the strips of tape as a reference and keeping constant the relative positions of the reference end of the strips of tape and that electrode which is nearest the reference end.

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: An ultrasonic welding tool with fluid drive, wherein the ultrasonic welding tool (2) is connected by way of a piston rod (3) to a working piston (5) which is guided in a housing (4) of the drive, wherein the working piston (5) sub-divides the drive housing (4) into a primary chamber (6) and a secondary chamber (7), wherein each of the chambers is able to communicate by way of a valve (16) with a fluidized pressure source, wherein at least one sensor (18, 19) is provided for detecting a physical property of the fluid drive which sensor emits an actual signal which is in relationship with the physical property detected and which via a control circuit controls the two valves in such a way that the physical property detected follows a reference value profile.

Abstract: A method and device for automated manufacture of an elongated composite material part having at least one layer. The method includes depositing, by unrolling onto a mold, in a first direction, along the mold, an assembly having a composite material layer separably attached to a substrate tape, and forming and compacting part of the assembly onto the mold in the first direction. The assembly is partially shaped to the shape of the mold, and then a remaining portion of the assembly is formed and compacted in a second direction, opposite the first direction, to shape the assembly completely to the shape of the mold. Then the assembly is separated, by peeling the substrate tape from the composite material layer that is secured to the mold, by unrolling the substrate tape in the second direction.

Abstract: To provide a laminating method which achieve high accuracy and high quality in a laminating step of an optical sheet and a display panel. Contact areas between the optical sheet and the sheet holding head are read. At this time, an optical element face of the optical sheet is brought into contact with the sheet holding head, light is irradiated to the contact areas therebetween from a no-optical-element face, and positional information of the optical sheet is read based on the distribution of the reflected light thereof.

Abstract: A processing speed of each mechanisms in a cutting section is controlled such that all polarizing films housed in a container in advance are used in a joining process and simultaneously a new container with polarizing films housed therein that are cut by a size of a liquid crystal panel is loaded from the cutting section. Here, a fracture included in the polarizing film is cut and removed in the cutting section while a delayed time due to this process is shortened by controlling at least a processing speed in a processing mechanism in a cutting mechanism among mechanisms provided in the cutting section and the joining section.

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: A hand held labeler has a support liner wheel that is driven by a motor to accurately advance the label web, while providing adequate storage for the support liner of an entire label web. In one embodiment, the labeler includes a micro-controller that controls the motor to vary the speed of the support liner wheel to accommodate for the increased speed of the label web as the circumference of the support liner grows on the support liner wheel. The labeler also includes an applicator to separate the labels from the support liner. The applicator may include a trigger mechanism that is connected to the micro-controller to signal the micro-controller that a label has been placed on an item. The micro-controller may be programmed to start the motor upon receiving the signal from the trigger mechanism.

Abstract: The present invention is to provide a label automatic application device and a label automatic application method capable of easily removing a large number of single labels one by one from a label band body formed by coupling the single labels while displacing and overlapping the labels with each other in the longitudinal direction, so as to automatically apply a large amount of labels to application bodies per unit time. A label band body 8 formed by displacing a little and overlapping many single labels with each other is attached to a label transfer belt conveyor 32. The label transfer belt conveyor 32 to which the label band body 8 is attached and a product transfer belt conveyor 52 for moving application bodies 54 are arranged so that the forward directions thereof are the opposite directions to each other. The air is jetted by an air jet means 38 to a surface onto which a bonding means 5 is coated in a front end 1y of a lead label 1a of the label band body 8.

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 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: An application and infusion system for applying a resin to one or more fiber tows and for infusing the fiber tows with the resin, wherein each of the fiber tows is moving at a respective fiber speed. The application and infusion system includes a deposition and infusion system comprising one or more nozzles configured to deposit the resin on a respective one of the fiber tows. The system further includes a controller configured to control a flow rate of the resin through each of the nozzles relative to the fiber speed of the respective ones of the fiber tows. Other aspects of the application and infusion system are also provided.

Abstract: In a method for labeling, a label strip (20) is moved by means of an electric motor (80). Arranged on this label strip are labels (26) of predetermined length (EL) with uniform interstices (SB). The motor has associated with it a position controller (218), also a sensor (44) for sensing a predetermined position of a label (26) when the latter is moved on the label strip (20) relative to the sensor (44). The method has the following steps: in accordance with a stored profile, the label strip (20) is set in motion beginning from a start position (A), a first target position (Z) of the label strip being specified to the position controller (218); during the motion of the label strip (20), a predetermined position (M) of the label strip (20) is sensed; and subsequently thereto, a revised target position (Z) is specified to the position controller (218). This makes possible fast and precise labeling, since the target position can be reached very accurately. A corresponding device has a compact design.

Abstract: A simulation press having a main body and an actuator attached thereto. The actuator is substantially aligned with the main body. A first plate is coupled to the main body and a second plate is coupled to the actuator. Both plates are adapted to engage a workpiece so as to simulate various modes of deformation of an area or areas on the workpiece when the second plate is moved relative to the first plate. The simulation press further includes a drive controller for controlling operation of the actuator. The drive controller additionally responds to feedback from at least one feedback sensor included with the simulation press.

Abstract: A label product in web form has alternating, oppositely indented creases in the liner of the product to produce a fan-folded stack having alternating, reversely folded plies. Each crease is substantially, if not entirely, perforation-free to maximize the strength of the liner at the fold lines. The product is preferably produced on a narrow web press in a creasing station that includes a stack of rolls wherein a first die roll is on the bottom of the stack, a second die roll is on the top of the stack, and a pair of base rolls are located in the middle of the stack between the die rolls. A blade on each die roll cooperates with a cushion on the corresponding base roll to produce a crease during every other rotation of the die roll, each of the base rolls having a smaller circumference than its corresponding die roll.

Abstract: The invention relates to an adhesive application apparatus for use with an assembling machine for assembling operatively upper and lower components for carrying printhead integrated circuits. The application apparatus includes a plate and a dispensing mechanism which includes an adhesive reservoir, said mechanism being operatively engaged with said plate in a sealing and sliding manner, the mechanism configured to dispense adhesive onto the plate when sliding along the plate. The apparatus also includes a displacement mechanism to slide the dispensing mechanism along the plate, and a control system to control operation of the dispensing and displacement mechanisms.

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: The invention relates to a machine for the manufacture of a web of corrugated board which is conveyed in a working direction and comprises at least one smooth liner and at least one corrugated medium that has corrugation tips and corrugation troughs, the corrugated medium being applied by adhesion to the at least one liner at least in the vicinity of the corrugation troughs, wherein a quality assessment device for assessment of the quality of the adhesive bond between the at least one liner and the at least one corrugated medium is provided, which comprises at least one ultrasonic transmitter that is disposed on one side of the web of corrugated board and at least one ultrasonic receiver that is disposed on the opposite side of the web of corrugated board and is allocated to the at least one ultrasonic transmitter; and a control anti evaluation unit which, in a manner for data transmission, is connected to the at least one ultrasonic receiver for evaluation of the signal of the ultrasonic receiver.

Abstract: The invention relates to a marking system comprising wires exhibiting ultrasoft ferromagnetic properties. Said wires are arranged on or in a carrier and are associated with pre-established parallel positions which are separated by a constant gap according to a pre-established frame. The wires can be present or absent in each position, forming a detectable binary code. The inventive marking system can especially be embodied as a magnetically coded label. The invention also relates to a method for producing one such marking system by continuously incorporating ferromagnetic wires into an adhesive complex. The inventive marking system is used to identify and authenticate articles, products or objects.

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 substrate bonding device for fabricating a liquid crystal display (LCD) device accurately aligns substrates of the LCD device while preventing the introduction of foreign material into the substrate bonding device, thereby substantially preventing the generation of defects within liquid crystal material of the LCD device.

Abstract: A method for applying and monitoring an application structure comprising a repairing function and device thereof are provided. The method includes arranging automatically a first application structure on the substrate using the application device. The first application structure on the substrate monitored by the at least one camera such that the at least one camera is constantly aligned to the first application structure and the first application structure. The method further includes transmitting the images acquired by the at least one camera to an image processing device that analyzes the images of the first application structure and the image processing device filing partial areas of the first application structure. The method also includes applying, after application of all partial areas of the first application structure, at least a second application structure to the substrate by the application device based on the repair list.

Abstract: A mixing device for synthetic leather to joint with a solid powder material includes a material mixing unit and a stirring and conveying unit. The material mixing unit includes a mixing body and two feeders. The mixing body is connected with the two feeders and has a mixing chamber therein which is intercommunicated with the two feeders. The stirring and conveying unit is connected with the material mixing unit and has a stirring and conveying chamber therein which is intercommunicated with a solid material container and the mixing chamber. Thereby, a solid powder material, a first material and a second material are respectively disposed in the solid material container and the feeders, and then guided into the mixing chamber to be well mixed for forming a mixture. The mixture is manufactured to form synthetic leather containing the solid powder material.

Abstract: An alignment tool for a bonding apparatus comprises a loading surface for receiving a pushing force from a surface of a device which is attached to the bonding apparatus, the loading surface being arranged and constructed to experience a tilting moment upon receiving an unequally distributed pushing force from a misaligned device acting on it. The loading surface transmits the tilting moment experienced by it to a sensing surface which is operatively connected to the loading surface through a columnar body, which has a smaller width than the loading surface and the sensing surface, and which connects the loading surface and the sensing surface. An array of piezoelectric elements communicates with the sensing surface and produces electrical signals in response to the tilting moment such that a computing unit operatively connected to the piezoelectric elements may detect a direction of tilt of the loading surface from the electrical signals produced by the piezoelectric elements.

Abstract: An automated system and method for applying thermoplastic adhesives to work pieces from a roll of adhesive segments applied to an adhesive segment-laden carrier release tape. The present invention may be implemented in a system that automatically advances the adhesive segment-laden carrier release tape to position an adhesive segment thereon in the apparatus for application thereof to a work piece. Accurate indexing and advancement of the adhesive segment-laden carrier release tape preferably is provided by optical indexing of the carrier release tape, e.g., by the optical detection of a transverse line or other index marking printed or otherwise provided on the adhesive segment carrier release along with the adhesive segments deposited thereon.

Abstract: A fiber lay-up apparatus and method includes one or more fiber sources from at least one fiber supply wherein a fiber may be fed under tension to provide a pre-stress to the fiber. The fiber lay-up apparatus may include a resin impregnator for impregnating a fiber with a resin. The fiber may be impregnated under pressure to reduce friction, to provide a motive force to move the fiber through the impregnator, or to enhance control over impregnation. The fiber may be shaped by a fiber shaping unit including one or more active or passive shaping members that provide enhanced control over the shape and placement of the fiber as the fiber leaves the fiber lay-up apparatus. A cutting element for cutting a fiber as it is being layed-up may be positioned proximal to the one or more shaping members, and may enable the fiber lay-up apparatus to end the lay-up of one fiber (or set of fibers) and begin the lay-up of a new fiber (or set of fibers) without delay.

Abstract: In a corrugated cardboard machine and in a method of producing a web of corrugated cardboard, an electronic control device is provided in order to avoid downtimes of the corrugated cardboard machine, said control device being designed such that at least one web length of the web of corrugated cardboard between the at least one production device and a longitudinal cutting device is detectable and an application width of the at least one production device is variable in dependence on the at least one web length. Changing the application width prevents an escape of glue from the sides so that there is no need for cleaning.

Abstract: This marking or labeling machine comprises at least one marking or labeling member, and feed means for bringing each workpiece for marking or labeling into register with said member. The feed means comprise firstly at least two arms mounted to turn about a common first axis, and each carrying at least one member for supporting a workpiece for marking or labeling, and secondly independent means for driving each of the arms in rotation about the common first axis independently of the other arm.

Abstract: A rotary labelling machine comprises a carrousel that can be pivotally driven by a carrousel motor and a plurality of container stations supported by said carrousel, wherein each container station comprises a container-holder plate and a plate motor suitable to rotate the plate about its own axis, carrousel sensor means detecting the movement of the carrousel and generating a reference signal representative of the carrousel angular position, a plurality of local control units. Each control unit is connected with one of the plate motors, respectively, and is configured to receive and process the reference signal and generate a control signal specific for said plate motor. Signal propagation means are connected to the carrousel sensor means and to the local control units to propagate the reference signal to each of the local control units.

Abstract: A method and system for controlling the processing of an IC chip assembly line using a central computer system and a common communication protocol. In one embodiment, a manufacturing execution system (MES) is used as the computer system and the communications protocol is the standard semi equipment communications standard/generic equipment model (SECS/GEM). One or more equipment cell controllers (CC) may be used to communicate between the MES a plurality of in-line substations which comprise the assembly line. Automated vision camera systems may also communicate information to the MES via the CCs. In one embodiment, the MES maintains a database in memory comprising processing history of a die-strip and results of automated die-strip examination from the vision camera systems. In one embodiment, the die-strip may be of a ball grid array (BGA) type.

Abstract: An apparatus for positioning packing boxes relative to a covering sheet comprises a belt for conveying the sheet from a gluing unit to a device for centering the box on the pre-glued sheet and optical sensors for identifying the position of the sheet on a belt conveyor surface, the belt being made with at least two regions of the conveyor surface having contrasting colors.