WO2021053255A1 - Machine for the manufacture of hair removal strips and method of controlling said machine - Google Patents

Machine for the manufacture of hair removal strips and method of controlling said machine Download PDF

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Publication number
WO2021053255A1
WO2021053255A1 PCT/ES2020/070555 ES2020070555W WO2021053255A1 WO 2021053255 A1 WO2021053255 A1 WO 2021053255A1 ES 2020070555 W ES2020070555 W ES 2020070555W WO 2021053255 A1 WO2021053255 A1 WO 2021053255A1
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WO
WIPO (PCT)
Prior art keywords
station
drive roller
die
traction
cutting
Prior art date
Application number
PCT/ES2020/070555
Other languages
Spanish (es)
French (fr)
Inventor
Óscar LÓPEZ IGLESIAS
Hugo Marante Fondado
Original Assignee
Laboratorios Maverick, S.L.U.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Laboratorios Maverick, S.L.U. filed Critical Laboratorios Maverick, S.L.U.
Publication of WO2021053255A1 publication Critical patent/WO2021053255A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D26/00—Hair-singeing apparatus; Apparatus for removing superfluous hair, e.g. tweezers
    • A45D26/0014—Hair-singeing apparatus; Apparatus for removing superfluous hair, e.g. tweezers using wax
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D26/00—Hair-singeing apparatus; Apparatus for removing superfluous hair, e.g. tweezers
    • A45D26/0019—Hair-singeing apparatus; Apparatus for removing superfluous hair, e.g. tweezers using an adhesive element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q9/00—Preparations for removing hair or for aiding hair removal
    • A61Q9/04—Depilatories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
    • B26D1/40—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member
    • B26D1/405—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/023—Packaging fluent material

Definitions

  • the object of the present invention is framed in the technical field of hygiene and personal care products.
  • a depilatory strip manufacturing machine and a control method of said machine are proposed that allow continuous manufacturing of depilatory strips, guaranteeing a correct alignment of the adhesive substance on the substrate of the depilatory strips.
  • Depilatory bands generally comprise two strips of a support material, mainly composed of paper and impregnated with an adhesive substance that is what allows the hair to be removed. Generally this adhesive substance is wax.
  • the support strips have the wax impregnated only on one of their faces so that the wax is arranged between the two support strips, the wax being protected and isolated from the outside until the time the strip is to be used.
  • the user separates both support strips, obtaining two equal and evenly impregnated bands, ready for application on the skin in the area to be epilated.
  • the adhesive substance is arranged in the central part of the strip, leaving a perimeter edge free of adhesive substance.
  • the user applies the band on the impregnated face on the area where he wants to remove the hair, smoothing it in the direction of hair growth and thus adhere to the skin.
  • the band is removed with one hand forcefully (grasping it by the perimeter edge free of adhesive substance), pulling the hair out by the roots.
  • Document ES2668817 is known from the state of the art, which describes a method of manufacturing a hair removal element comprising a support substrate and a protective film, including the adhesive substance used to remove hair.
  • the procedure describes a stage of To obtain a continuous strip of the laminated type, applying the adhesive substance in portions discretely and periodically to the support substrate and then applying the protective film on the adhesive portions. Subsequently, it comprises a step of applying a cutting die to define adhesive-free lateral extensions where the cutting die passes through the support substrate and the protection film. The remaining scrap is recovered continuously by means of an accumulation roller or by gravity or suction when it is discontinuous.
  • a second substrate acts as a release liner to protect the coated substrate.
  • the second substrate may comprise a continuous web or discontinuous material that includes discrete sheets.
  • a composite structure can be created where the first surface of the substrate faces the first surface of the second substrate.
  • the discrete area of the personal care composition would be sandwiched between the substrate and the second substrate.
  • the personal care composition and the substrate are preferably different shapes with the area of the substrate larger than the personal care composition. This provides an area for the consumer to hold the substrate that is not coated in the personal care composition.
  • a blade preferably a rotary die cutter, can be used to cut the shape into the substrate.
  • a second blade can be used to cut the shape into the second substrate.
  • the scrap material can be removed from the process for recycling or disposal.
  • Document JP2004305310 is also known which describes a depilatory sheet suitable for removing hair.
  • a depilatory adhesive layer is formed on the surface of a backing sheet, and a release paper sheet in the same way as the backing sheet is superimposed on the adhesive layer in such a way that the peripheral edge of the release paper sheet snaps to peripheral edge of carrier sheet.
  • the depilatory adhesive layer is formed only in the center in the longitudinal direction, but it is not formed at least at both ends in the longitudinal direction on the surface of the backing sheet.
  • document ES2018925 describes a procedure for the manufacture of dressings for aesthetic and cosmetic purposes, consisting of a first phase of mixing the appropriate ingredients in each case, according to the treatment to be carried out, in a stainless steel tank at a temperature of 60 degrees centigrade, then in a second phase by placing a textile base on a flat and smooth totally aseptic surface, and spreading the product on it, by compression, at room temperature, then in a third phase the whole is die-cut, in the appropriate shapes to the area of the body where it is to be applied, and finally the dressings obtained will be placed in protective bags heat welded.
  • the invention relates to a depilatory strip manufacturing machine and a control method of said machine.
  • the depilatory strips that are manufactured with the machine and the procedure described are of the type that comprise a substrate, in which there is an adhesive substance, preferably wax.
  • the machine and method are preferably configured to manufacture depilatory bands with curved edges.
  • the bands are obtained by cutting, with the desired shape, the substrates already impregnated with the wax.
  • the invention allows the depilatory bands to be manufactured continuously, ensuring a correct alignment of the adhesive substance (wax) on the substrate on which it is positioned and with respect to the cutting die by which the band is obtained.
  • the strips obtained have four sides, two of them parallel to each other (the cut is made in the longitudinal direction of the strip) and two other curved sides (joining the parallel sides).
  • a coil of tape made of an elastic material is arranged in the machine, which forms the substrate of the band.
  • the adhesive substance is distributed on said tape and subsequently a cut is made, with a rotating die, to obtain the depilatory bands. It is essential that the adhesive substance is arranged centrally on the web. To do this, the usual misalignments that occur in the wax placement process and in the cutting process (punching) of the strip must be avoided.
  • the die-cutting process generates a waste (excess paper) since the reels have a greater width than the substrate of the bands to be obtained. Thus, after cutting, a negative of the bands is obtained. In this way the waste can be collected continuously and it is not necessary to install additional collection systems. It is key to keep the speed constant during the collection of the waste because otherwise the centering of the wax with respect to the shape of the band would vary.
  • the machine comprises a feeding station in which the coil of a tape of elastic material (generally paper) that is used as a substrate for the depilatory band is arranged; a station for impregnating the adhesive substance on the tape; and a cutting station in which, by means of a rotating die, the cut that forms the depilatory band is made. It also includes a continuous waste winding station.
  • a feeding station in which the coil of a tape of elastic material (generally paper) that is used as a substrate for the depilatory band is arranged; a station for impregnating the adhesive substance on the tape; and a cutting station in which, by means of a rotating die, the cut that forms the depilatory band is made. It also includes a continuous waste winding station.
  • a solution to ensure a constant speed of the belt along the path is the provision of an unwinding traction station, after the feeding station, and a waste traction station, after the unwinding station. cutting, before the winding station.
  • the control of the movement of the belt along the machine is carried out by means of servomotors that are part of the stations and that are synchronized with each other.
  • the machine comprises servo motors instead of asynchronous motors driven through frequency inverters precisely to ensure that the speed of the belt and the waste (the already trimmed belt) is the same throughout the entire run.
  • the relationship between the different axes of the stations is as synchronized as possible even though the diameters of the drive rollers of the stations are different.
  • the gearboxes between the servomotors and the mechanics coupled to them are also different.
  • the relationships must be changing to be able to implement, for example, the automatic tension control (traction) that must be varied, for example, depending on the amount of tape that remains in the reel of the input station and the amount of waste that there is at the waste collection station.
  • a dosage control of the adhesive substance has been included with the servomotor that controls a drive roller of the station. court.
  • a virtual axis has been implemented. Said virtual axis is synchronized with the servo motor of the driving roller of the cutting station (with its corresponding relationship, preferably defined by toothed wheels that drive the die). In this way, information on the degrees of rotation of the cutting die is obtained and the exact position of the cutting figures (die blades) can be controlled.
  • the virtual axis is set to 0 in each turn by detecting (for example by means of a laser detector) a specific point of the die in each complete turn. In this way, the starting point is secured on each lap.
  • the starting and ending degrees of each figure are selected so that, when connecting the machine or when necessary, a position capture mode in which the position of the drive roller encoder of the cutting station at the beginning and end of each figure is memorized with respect to the virtual axis.
  • the distance of tape traveled during each figure of the die is known.
  • the impregnation of adhesive substance in the impregnation station is calculated, thus incorporating the error between the advancement ratios of the tape with respect to the cut, in the space between each impregnation and limited to a die turn.
  • Adjusting the tension of the tape is done by controlling the unwinding tension and controlling the tension and the winding torque of the waste.
  • Figure 1 represents a perspective view of the depilatory strip manufacturing machine.
  • Figure 2 represents another perspective view of the depilatory strip manufacturing machine in which a detail of the cutting station has been represented.
  • Figure 3 represents a view of the unwinding traction system.
  • Figures 4A-B represent perspective views of the cutting station in which the die linked to the driving roller and the cutting traction system are observed.
  • the depilatory strips that are manufactured with the machine described are of the type that comprise a substrate, preferably made of a partially elastic material (such as paper), on which is an adhesive substance, preferably wax.
  • the machine and method are preferably configured to manufacture depilatory bands with curved edges. The bands are obtained by cutting, with the desired shape, the substrates already impregnated with the wax.
  • the invention allows the bands to be manufactured continuously, ensuring a correct alignment of the adhesive substance (wax) on the substrate on which it is positioned and with respect to the cutting die by which the band is obtained.
  • the adhesive substance must be centered on the depilatory strip so that the adhesive substance-free perimeter can be used by the user to grasp the strip and pull it.
  • the strips obtained have four sides, two of them parallel to each other (the cut is made in the longitudinal direction of the strip) and two other curved sides (joining the parallel sides).
  • Figure 1 shows a perspective view of the depilatory strip manufacturing machine.
  • the machine is configured to receive a roll of substrate material tape (such as paper) that is unwound and passed through a path through the entire machine.
  • the adhesive substance generally wax
  • the adhesive substance is arranged discontinuously, leaving a free space between one impregnation and the next.
  • the tape is cut, with a rotating die such as the one that can be seen in the detail of figure 2, to obtain, on the one hand, the depilatory strips and, on the other, a waste that is collected continuously.
  • the waste is the excess of the tape that has not been used as a substrate for the bands.
  • the key to the invention is to keep the speed of the belt constant throughout its journey through the machine. It must be taken into account that, as the waste is also collected continuously, the tension applied to it also affects the positioning of the belt. Since the substrate of the depilatory bands is made of a material that is at least partially elastic, it is essential to maintain this speed to avoid uncontrolled elongations that lead to cumulative misalignments. These misalignments would cause the impregnation of the wax and / or the cut not to were centered on the tape. In current machines, to minimize misalignment, the mechanical ratio is varied with a variable gearbox. That is, when a deviation in impregnation is observed, the ratios or shear moment are manually adjusted.
  • the machine of the present invention comprises a feeding station (1) with a support shaft (2) configured to receive a reel (2) of tape (4) of substrate material.
  • a tensioner (5) (unwinding traction station) that is in charge of applying a certain tension on the tape (4) to carry out the unwinding operation.
  • said tensioner (5) comprises a tensioner servomotor (6) linked to a tensioning drive roller (7) for its drive. It also comprises a tensioner pressure adjustment system (8) comprising at least one adjustment roller, facing the tensioning drive roller (7), and with the possibility of movement with respect to it to move away or approach.
  • the belt (4) passes through the adjustment roller and the tensioning drive roller (7), and the tensioner pressure adjustment system (8) applies a greater or lesser force on said belt (4) depending on the position where you place the first adjustment roller.
  • the impregnation station (9) of the adhesive substance (generally wax) as seen in Figures 1 and 2.
  • Said impregnation station (9) is configured to apply the adhesive substance discontinuously on the belt (4), for which it performs two cycles.
  • the tape (4) is impregnated, in the center of the area to be trimmed to form the depilatory band.
  • no impregnation is carried out, thus leaving a free space of wax between what will be two consecutive bands.
  • the wax impregnation station (9) comprises a circuit with a metering pump connected to a reservoir of adhesive substance and to a nozzle configured to apply the adhesive substance to the tape (4).
  • the pump is also connected to a frequency variator that allows modifying the speed of said dosing pump so that, depending on the speed, more or less adhesive substance is applied in more or less time and its weight is always the same. Right. This adjusts the amount of adhesive substance it is impregnated in each cycle.
  • the wax impregnation station (9) also has a metering valve that distributes the passage of the adhesive substance towards the nozzle, or towards the reservoir in the second cycle, thus avoiding overpressures in the circuit. It can also comprise a temperature regulation system with a plurality of thermal resistances, responsible for maintaining the desired temperature homogeneously throughout the circuit through which the adhesive substance flows to prevent it from solidifying.
  • FIGS. 4A-B show the cutting station (10) from two different perspectives.
  • the cutting station there are two drive rollers, more specifically an input drive roller (12) and a cutter drive roller (14). Each of them is coupled to a servomotor (input servomotor (13) and cutter servomotor (15).
  • Figure 4A shows the input drive roller (12), which faces a pressure adjustment system of the cutting station (13) comprising at least one adjustment roller, facing the input drive roller (12 ) and with the possibility of displacement with respect to it to move away or closer, thus adjusting the traction pressure applied on the belt (4).
  • the cutting station (10) comprises an axial adjustment system, configured to axially move the cutting station (10), or at least the die (11), to center it on the belt (4).
  • the movement can be carried out by means of threaded elements that join a support of the cutting station (10), on which It is mounted, with a fixed element of the machine, such as a machine frame, and that allow said relative movement.
  • FIG 2 it can be seen how the depilatory bands (16) are collected after punching, for example arranged on a conveyor belt (18). It is also observed how the shrinkage (17) is directed towards the next machine station, in this case a shrinkage traction station (19). As can be seen in the figure, the loss (17) is a "negative" of the depilatory bands on the tape (4).
  • the shrinkage traction station (19) is similar to the tensioner (5), that is, it comprises a traction servomotor (20) linked to a traction drive roller (21). It also comprises a traction pressure adjustment system (22) that comprises at least one adjustment roller that approaches or moves away from the traction drive roller (21) depending on the pressure to be exerted on the shrinkage (17) .
  • the waste (17) is the tape (4) left over after cutting, so the pressure exerted on it is directly linked to the speed of the tape (4) throughout the machine. As previously described, it is essential to keep the linear displacement speed of the thinning constant to ensure correct centering of the adhesive substance on the depilatory band.
  • the machine comprises a winding station (23) shown in figure 5.
  • This station is configured to wind the waste (17) by controlling, by means of a machine control unit, the torque of a shaft of collection (24) around which it is wound.
  • the collection shaft (24) is linked to a collection servomotor (25) by means of a transmission system (26).
  • a transmission system (26).
  • It also comprises an inflation system to be able to hold the shrinkage (17) without the need for additional fastening elements.
  • To remove the shrink coil (17) it is only necessary to deflate some membranes of an inflation system of the machine and remove it.
  • the shrinkage traction station (19) is essential to prevent tension variations caused by the winding station (25) from damaging the cutting operations due to the elasticity of the tape (4).
  • the machine also includes a control unit that is configured to manage and control all the elements that make up the machine.
  • the servo motors of the machine work in a closed loop, controlled by servo drives (drivers) that are in communication with each other through the control unit. These elements work with instructions in real time.
  • servomotors have been used instead of asynchronous motors driven with frequency variators to ensure constant speed of the belt (4) and waste (17).
  • the relationship between all the traction axes of the belt (4) is as synchronized as possible taking into account the diameters of the different driving rollers (tensioning driving roller (7), input driving roller (12) , cutter drive roller (14) and traction drive roller (21)) are different and so are the reducers between servomotors (the servomotors are coupled to the shafts through reducers to obtain enough torque) and the mechanics applied to servo motors.
  • the tensioner relationships must be changing to be able to implement the tension control applied to the belt automatically.
  • the control of the dosage of the wax is carried out by means of an encoder of the servo motor of the cutter (15) (which is the servo motor on which the others depend, that is, the master servo motor).
  • an encoder of the servo motor of the cutter (15) which is the servo motor on which the others depend, that is, the master servo motor.
  • precise control of the movement of the tape (4) on the drive roller of the cutter (14) is carried out, thus improving the impregnation precision.
  • this solution by itself does not allow to solve the problem of the accumulated error between the relations of the cutting station (10) and all the driving rollers in charge of moving the belt (4) along the entire path.
  • a virtual axis synchronized with the drive roller of the cutter (14) is implemented (with its corresponding relationship, preferably defined by the toothed wheels that drive the die (11)).
  • This virtual axis allows to know the position of the blades of the die (11) electronically since the sevomotor of the cutter (15) is coupled to a reducer with which, through a transmission gear (for example with two pinions ) is linked to the cutter roller (14).
  • a transmission gear for example with two pinions
  • the virtual axis is reset to zero in each turn after the detection, by a laser detector, of a specific point of the die (11) in each complete turn, thus ensuring the starting point in each turn.
  • a position capture mode is executed that comprises a step of memorizing the position of the virtual axis and the encoder of the drive roller of the cutter (14) at the beginning and at the end of each cutting figure (which determines the shape of a depilatory band) to know the distance of tape (4) traveled during the length of each figure of the die (11). Based on these values, the impregnation of the wax is controlled, managing to incorporate the error between the advance relationships of the tape (4) with respect to the die (11), in the space between each impregnation and always limited to one die turn ( eleven).
  • the control method allows to control the unwinding tension (that is, the tension applied to the tape (4) in the tensioner (5) by means of a “tenser” system (electronic tension control system of the belt (4)) that allows to separate a variable corresponding to the weight of the reel (2) from a tension variable on the belt (4).
  • a “tenser” system electronic tension control system of the belt (4)
  • the torque applied by the servo motor of the cutter is monitored in real time (15) when pulling the belt (4) to be able to vary in real time the ratio of the tension drive roller servo motor (6) with with respect to said servo motor of the cutter (15), looking for a predetermined torque command, entered through a user interface.
  • the control method of the present invention can also comprise a step of control of the winding tension of the waste (17) that allows to obtain a high precision in the position of the cut with respect to the adhesive substance already impregnated.
  • This control is carried out by synchronizing the speed of the belt (4) in the cutting station (10) and the speed of the belt (4) in the shrinkage traction station (19).
  • a control of the winding torque of the waste is also carried out (17).
  • the waste (17) is wound, as an output coil (27) on a collection shaft (24).
  • the diameter of the output reel (27) increases as the amount of waste (17) increases (proportional to the decrease in diameter of the reel (2) of tape (4) of the feeding station (1)). Due to said changing diameter, it is not possible to make a synchronism with the driving roller of the cutter (14) (from which the other elements of the machine are controlled) since the transmission ratio changes at each turn.
  • the width of the shrinkage (17) is very small since the excess of the tape (4) must be as little as possible to reduce manufacturing costs. This leads to shrinkage breaks (17) as soon as the tension is slightly increased.
  • the control method comprises a winding torque control stage so that the pick-up servomotor (25) only applies the desired torque entered through the user interface, applying an increase and decrease ramp of the winding torque. applied torque. That is, the voltage deviations are corrected to bring the torque parameter to a predetermined value but in a "smooth" way, without sudden changes that would cause a breakdown of the loss (17). In this way, the complete waste (17) is wound correctly.
  • This is an additional control by which the factor that the diameter of the take-up reel (27), as it changes, varies the speed of the shrinkage (17) (also affecting the speed of the belt (4) is eliminated. ) along the path of the machine) and may break it. For this reason, it is essential to control the torque, that is, to control the force applied to the belt (4) and the loss (17) so that it does not break.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Forests & Forestry (AREA)
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Abstract

A machine for the manufacture of hair removal strips, comprising a feed station (1) of a band (4) of substrate of the strips; a station (9) for the impregnation of an adhesive substance on the band (4); a cutting station (10) for the stamping of the band (4) and the obtaining of hair removal strips (16) and a band of scrap (17), and a winding station (19) for the band of scrap (17). It comprises a tensioner (5) that aids the unreeling, and a traction station (19) for the band of scrap prior to the winding station (23). The stations comprise servo motors in real-time communication with one another through the machine control unit. The machine prevents errors in the alignment of the adhesive substance on the band, even on bands (4) of elastic material. A method for the controlling of said machine is also described.

Description

MÁQUINA DE FABRICACIÓN DE BANDAS DEPILATORIAS Y MÉTODO DE DEPILATORY BAND MANUFACTURING MACHINE AND METHOD OF
CONTROL DE DICHA MÁQUINA CONTROL OF SAID MACHINE
DESCRIPCIÓN DESCRIPTION
OBJETO DE LA INVENCIÓN OBJECT OF THE INVENTION
El objeto de la presente invención se enmarca en el campo técnico de la higiene y los productos de cuidado personal. The object of the present invention is framed in the technical field of hygiene and personal care products.
Se proponen una máquina de fabricación de bandas depilatorias y un método de control de dicha máquina que permiten la fabricación en continuo de las bandas depilatorias, garantizando un correcto alineamiento de la sustancia adhesiva en el sustrato de las bandas depilatorias. A depilatory strip manufacturing machine and a control method of said machine are proposed that allow continuous manufacturing of depilatory strips, guaranteeing a correct alignment of the adhesive substance on the substrate of the depilatory strips.
PROBLEMA TÉCNICO A RESOLVER Y ANTECEDENTES DE LA INVENCIÓN TECHNICAL PROBLEM TO BE SOLVED AND BACKGROUND OF THE INVENTION
Las bandas depilatorias comprenden generalmente dos tiras de un material de soporte, compuesto mayoritariamente por papel e impregnadas con una sustancia adhesiva que es la que permite retirar el vello. Generalmente esta sustancia adhesiva es cera. Las tiras de soporte llevan impregnada la cera solo en una de sus caras de manera que la cera está dispuesta entre las dos tiras de soporte, quedando la cera protegida y aislada del exterior hasta el momento en que la banda se va a utilizar. Depilatory bands generally comprise two strips of a support material, mainly composed of paper and impregnated with an adhesive substance that is what allows the hair to be removed. Generally this adhesive substance is wax. The support strips have the wax impregnated only on one of their faces so that the wax is arranged between the two support strips, the wax being protected and isolated from the outside until the time the strip is to be used.
Para poder usar la banda, el usuario separa ambas tiras de soporte, obteniendo dos bandas iguales e impregnadas de manera uniforme, listas para su aplicación sobre la piel en la zona que se quiere llevar a cabo la depilación. La sustancia adhesiva se dispone en la parte central de la banda, dejando un borde perimetral libre de sustancia adhesiva. El usuario aplica la banda por la cara impregnada sobre la zona en la que quiere retirar el vello, alisándola en sentido de crecimiento del vello y así se adhieren a la piel. La banda se retira con una mano de forma enérgica (agarrándola por el reborde perimetral libre de sustancia adhesiva), arrancando el vello de raíz. In order to be able to use the band, the user separates both support strips, obtaining two equal and evenly impregnated bands, ready for application on the skin in the area to be epilated. The adhesive substance is arranged in the central part of the strip, leaving a perimeter edge free of adhesive substance. The user applies the band on the impregnated face on the area where he wants to remove the hair, smoothing it in the direction of hair growth and thus adhere to the skin. The band is removed with one hand forcefully (grasping it by the perimeter edge free of adhesive substance), pulling the hair out by the roots.
Del estado de la técnica se conoce el documento ES2668817 que describe un procedimiento de fabricación de un elemento de depilación de los que comprenden un sustrato de soporte y un film protector entre los que se encuentra la sustancia adhesiva que se emplea para retirar el vello. El procedimiento describe una etapa de obtener una tira continua de tipo laminado aplicación la sustancia adhesiva en porciones de forma discreta y periódica el sustrato de soporte y aplicando después el film de protección sobre las porciones de adhesivo. Posteriormente comprende una etapa de aplicar un troquel de corte para definir unas extensiones laterales libres de adhesivo y donde el troquel de corte atraviesa el sustrato de soporte y el film de protección. El retal restante se recupera en continuo mediante un rodillo de acumulación o por gravedad o aspiración cuando es discontinuo. Document ES2668817 is known from the state of the art, which describes a method of manufacturing a hair removal element comprising a support substrate and a protective film, including the adhesive substance used to remove hair. The procedure describes a stage of To obtain a continuous strip of the laminated type, applying the adhesive substance in portions discretely and periodically to the support substrate and then applying the protective film on the adhesive portions. Subsequently, it comprises a step of applying a cutting die to define adhesive-free lateral extensions where the cutting die passes through the support substrate and the protection film. The remaining scrap is recovered continuously by means of an accumulation roller or by gravity or suction when it is discontinuous.
El documento US2014205741 que describe un procedimiento para recubrir una composición depilatoria sobre al menos un área de tratamiento discreta de un sustrato impermeable al agua. Un segundo sustrato actúa como un revestimiento de liberación para proteger el sustrato recubierto. El segundo sustrato puede comprender una banda continua o material discontinuo que incluye láminas discretas. Se puede crear una estructura compuesta donde la primera superficie del sustrato se enfrenta a la primera superficie del segundo sustrato. El área discreta de la composición para el cuidado personal se intercalaría entre el sustrato y el segundo sustrato. La composición de cuidado personal y el sustrato son preferiblemente formas diferentes con el área del sustrato más grande que la composición de cuidado personal. Esto proporciona un área para que el consumidor sostenga el sustrato que no está recubierto en la composición de cuidado personal. Se puede usar una cuchilla, preferentemente una troqueladora rotativa, para cortar la forma en el sustrato. Se puede usar una segunda cuchilla para cortar la forma en el segundo sustrato de El recorte del material sobrante puede retirarse del proceso para reciclarlo o desecharlo. Document US2014205741 which describes a process for coating a depilatory composition on at least one discrete treatment area of a water-impermeable substrate. A second substrate acts as a release liner to protect the coated substrate. The second substrate may comprise a continuous web or discontinuous material that includes discrete sheets. A composite structure can be created where the first surface of the substrate faces the first surface of the second substrate. The discrete area of the personal care composition would be sandwiched between the substrate and the second substrate. The personal care composition and the substrate are preferably different shapes with the area of the substrate larger than the personal care composition. This provides an area for the consumer to hold the substrate that is not coated in the personal care composition. A blade, preferably a rotary die cutter, can be used to cut the shape into the substrate. A second blade can be used to cut the shape into the second substrate. The scrap material can be removed from the process for recycling or disposal.
Se conoce también el documento JP2004305310 que describe una lámina depilatoria adecuada para eliminar el vello. En la lámina depilatoria se forma una capa adhesiva depilatoria en la superficie de una lámina de soporte, y una lámina de papel de liberación en la misma forma que la lámina de soporte se superpone en la capa adhesiva de tal manera que el borde periférico de la hoja de papel de liberación se ajusta al borde periférico de la hoja de soporte. La capa adhesiva depilatoria se forma solo en el centro en la dirección longitudinal, pero no se forma al menos en ambos extremos en la dirección longitudinal en la superficie de la lámina de soporte. Document JP2004305310 is also known which describes a depilatory sheet suitable for removing hair. In the depilatory sheet, a depilatory adhesive layer is formed on the surface of a backing sheet, and a release paper sheet in the same way as the backing sheet is superimposed on the adhesive layer in such a way that the peripheral edge of the release paper sheet snaps to peripheral edge of carrier sheet. The depilatory adhesive layer is formed only in the center in the longitudinal direction, but it is not formed at least at both ends in the longitudinal direction on the surface of the backing sheet.
Asimismo, en el documento ES2018925 se describe un procedimiento para la fabricación de apósitos con fines estéticos y cosméticos, compuesto por una primera fase de mezcla de los ingredientes apropiados en cada caso, según el tratamiento a realizar, en un tanque de acero inoxidable a una temperatura de 60 grados centígrados, luego en una segunda fase colocando una base textil sobre una superficie plana y lisa totalmente aséptica, y extendiendo el producto sobre ella, por compresión, a temperatura ambiente, luego en una tercera fase se procede al troquelado del conjunto, en las formas adecuadas a la zona del cuerpo donde se ha de aplicar, y finalmente se colocarán los apósitos obtenidos en bolsas protectoras soldadas con calor. Likewise, document ES2018925 describes a procedure for the manufacture of dressings for aesthetic and cosmetic purposes, consisting of a first phase of mixing the appropriate ingredients in each case, according to the treatment to be carried out, in a stainless steel tank at a temperature of 60 degrees centigrade, then in a second phase by placing a textile base on a flat and smooth totally aseptic surface, and spreading the product on it, by compression, at room temperature, then in a third phase the whole is die-cut, in the appropriate shapes to the area of the body where it is to be applied, and finally the dressings obtained will be placed in protective bags heat welded.
El problema técnico de estos procedimientos de fabricación de bandas depilatorias es que, cuando se emplean para fabricar bandas que comprenden sustratos de material parcialmente elástico, como por ejemplo papel, se producen desalineaciones en la colocación de la cera en la banda. Generalmente se emplean procedimientos de fabricación en continuo en los que la cera se impregna en el sustrato de forma discontinua y periódica, a una distancia considerable (varios metros de material de sustrato). Con las máquinas y procedimientos actuales aparecen errores acumulativos en el posicionamiento de la cera por lo que se hace necesario el desarrollo de máquinas y procedimientos que permitan conseguir que la cera quede centrada en la forma de la banda. The technical problem with these depilatory strip manufacturing processes is that when used to make strips comprising substrates of partially elastic material, such as paper, misalignments occur in the placement of the wax on the strip. Generally, continuous manufacturing processes are used in which the wax is impregnated into the substrate discontinuously and periodically, at a considerable distance (several meters of substrate material). With current machines and procedures, cumulative errors appear in the positioning of the wax, which is why it is necessary to develop machines and procedures that allow the wax to be centered in the shape of the band.
Para conseguir resolver este problema es esencial tener en cuenta la tensión que se aplica al sustrato en el que se dispone la cera. Dicha tensión deber ser lo más constante posible ya que el material de sustrato para la impregnación tiene cierta elasticidad y, en caso de que no sea constante, incrementará la desalineación del sustrato respecto a la cera y a los troqueles de corte. In order to solve this problem, it is essential to take into account the stress applied to the substrate on which the wax is placed. Said tension should be as constant as possible since the substrate material for impregnation has a certain elasticity and, if it is not constant, it will increase the misalignment of the substrate with respect to the wax and the cutting dies.
DESCRIPCIÓN DE LA INVENCIÓN DESCRIPTION OF THE INVENTION
La invención se refiere a una máquina de fabricación de bandas depilatorias y un método de control de dicha máquina. Las bandas depilatorias que se fabrican con la máquina y el procedimiento que se describe son del tipo de las que comprenden un sustrato, en el que se encuentra una sustancia adhesiva, preferentemente cera. En este caso, la máquina y el procedimiento están preferentemente configurados para fabricar bandas depilatorias con bordes curvos. Las bandas se obtienen cortando, con la forma deseada, los sustratos ya impregnados con la cera. La invención permite fabricar las bandas depilatorias de forma continua, asegurando una correcta alineación de la sustancia adhesiva (cera) en el sustrato sobre el que se posiciona y respecto al troquel de corte mediante el que se obtiene la banda. En un ejemplo de realización, las bandas obtenidas tienen cuatro lados, dos de ellos paralelos entre sí (el corte se realiza en dirección longitudinal de la banda) y otros dos lados curvos (que unen los lados paralelos). The invention relates to a depilatory strip manufacturing machine and a control method of said machine. The depilatory strips that are manufactured with the machine and the procedure described are of the type that comprise a substrate, in which there is an adhesive substance, preferably wax. In this case, the machine and method are preferably configured to manufacture depilatory bands with curved edges. The bands are obtained by cutting, with the desired shape, the substrates already impregnated with the wax. The invention allows the depilatory bands to be manufactured continuously, ensuring a correct alignment of the adhesive substance (wax) on the substrate on which it is positioned and with respect to the cutting die by which the band is obtained. In an exemplary embodiment, the strips obtained have four sides, two of them parallel to each other (the cut is made in the longitudinal direction of the strip) and two other curved sides (joining the parallel sides).
En la máquina se dispone una bobina de cinta de un material elástico (preferentemente papel) que conforma el sustrato de la banda. Sobre dicha cinta se distribuye la sustancia adhesiva y posteriormente se realiza un corte, con un troquel rotativo, para obtener las bandas depilatorias. Es esencial que la sustancia adhesiva quede dispuesta de forma centrada en la banda. Para ello hay que evitar las desalineaciones habituales que se producen en el proceso de colocación de la cera y en el proceso de corte (troquelado) de la banda. A coil of tape made of an elastic material (preferably paper) is arranged in the machine, which forms the substrate of the band. The adhesive substance is distributed on said tape and subsequently a cut is made, with a rotating die, to obtain the depilatory bands. It is essential that the adhesive substance is arranged centrally on the web. To do this, the usual misalignments that occur in the wax placement process and in the cutting process (punching) of the strip must be avoided.
El proceso de troquelado genera una merma (papel sobrante) ya que las bobinas tienen una anchura mayor que el sustrato de las bandas a obtener. Así pues, tras el corte, se obtiene un negativo de las bandas. De esta forma la merma se puede recoger en continuo y no es necesario instalar sistemas de recogida adicionales. Es clave mantener la velocidad constante durante la recogida de la merma porque de no ser así variaría el centrado de la cera con respecto a la forma de la banda. The die-cutting process generates a waste (excess paper) since the reels have a greater width than the substrate of the bands to be obtained. Thus, after cutting, a negative of the bands is obtained. In this way the waste can be collected continuously and it is not necessary to install additional collection systems. It is key to keep the speed constant during the collection of the waste because otherwise the centering of the wax with respect to the shape of the band would vary.
La máquina comprende una estación de alimentación en la que se dispone la bobina de una cinta de material elástico (papel generalmente) que se emplea como sustrato para la banda depilatoria; una estación de impregnación de la sustancia adhesiva en la cinta; y una estación de corte en la que, mediante un troquel rotativo, se realiza el corte que conforma la banda depilatoria. Asimismo comprende una estación de bobinado de la merma en continuo. The machine comprises a feeding station in which the coil of a tape of elastic material (generally paper) that is used as a substrate for the depilatory band is arranged; a station for impregnating the adhesive substance on the tape; and a cutting station in which, by means of a rotating die, the cut that forms the depilatory band is made. It also includes a continuous waste winding station.
Una solución para asegurar una velocidad constante de la cinta a lo largo del recorrido es la disposición de una estación de tracción de desbobinado, a continuación de la estación de alimentación, y de una estación de tracción de la merma, a continuación de la estación de corte, antes de la estación de bobinado. El control del movimiento de la cinta a lo largo de la máquina se realiza mediante servomotores que forman parte de las estaciones y que se sincronizan entre sí. La máquina comprende servomotores en lugar de motores asincronos accionados a través de variadores de frecuencia precisamente para asegurar que la velocidad de la cinta y de la merma (la cinta ya recortada) sea la misma durante todo el recorrido. A solution to ensure a constant speed of the belt along the path is the provision of an unwinding traction station, after the feeding station, and a waste traction station, after the unwinding station. cutting, before the winding station. The control of the movement of the belt along the machine is carried out by means of servomotors that are part of the stations and that are synchronized with each other. The machine comprises servo motors instead of asynchronous motors driven through frequency inverters precisely to ensure that the speed of the belt and the waste (the already trimmed belt) is the same throughout the entire run.
Con la presente invención se consigue que la relación entre los distintos ejes de las estaciones sea lo más sincronizada posible aún siendo diferentes los diámetros de los rodillos motrices de las estaciones. También son diferentes los reductores entre los servomotores y la mecánica acoplada a estos. Las relaciones deben ser cambiantes para poder implementar, por ejemplo, el control automático de tensión (tracción) que debe ir variando por ejemplo en función de la cantidad de cinta que queda en la bobina de la estación de entrada y la cantidad de merma que hay en la estación de recogida de la merma. With the present invention it is achieved that the relationship between the different axes of the stations is as synchronized as possible even though the diameters of the drive rollers of the stations are different. The gearboxes between the servomotors and the mechanics coupled to them are also different. The relationships must be changing to be able to implement, for example, the automatic tension control (traction) that must be varied, for example, depending on the amount of tape that remains in the reel of the input station and the amount of waste that there is at the waste collection station.
Para garantizar que la sustancia adhesiva siempre se coloque de forma centrada sobre la cinta (y por tanto quede centrada en la banda depilatoria), se ha incluido un control de dosificación de la sustancia adhesiva con el servomotor que controla un rodillo motriz de la estación de corte. To ensure that the adhesive substance is always placed centrally on the tape (and therefore is centered on the depilatory strip), a dosage control of the adhesive substance has been included with the servomotor that controls a drive roller of the station. court.
Por otra parte, para eliminar errores acumulativos en las relaciones entre el servomotor que controla el rodillo motriz de la estación de corte y el resto de servomotores encargados de mover la cinta por toda la máquina, se ha implementado un eje virtual. Dicho eje virtual está sincronizado con el servomotor del rodillo motriz de la estación de corte (con su relación correspondiente, definida preferentemente por unas ruedas dentadas que traccionan el troquel). Así se obtiene información de los grados de giro del troquel de corte y se puede controlar la posición exacta de las figuras de corte (cuchillas del troquel). On the other hand, to eliminate cumulative errors in the relationships between the servomotor that controls the driving roller of the cutting station and the rest of the servomotors in charge of moving the tape throughout the machine, a virtual axis has been implemented. Said virtual axis is synchronized with the servo motor of the driving roller of the cutting station (with its corresponding relationship, preferably defined by toothed wheels that drive the die). In this way, information on the degrees of rotation of the cutting die is obtained and the exact position of the cutting figures (die blades) can be controlled.
El eje virtual se pone a 0 en cada vuelta al detectar (por ejemplo mediante un detector láser) un punto concreto del troquel en cada giro completo. De esta manera se asegura el punto de inicio en cada vuelta. The virtual axis is set to 0 in each turn by detecting (for example by means of a laser detector) a specific point of the die in each complete turn. In this way, the starting point is secured on each lap.
Mediante una interface de usuario se seleccionan los grados de inicio y fin de cada figura de forma que, al conectar la máquina o cuando sea necesario, se ejecuta un modo de captura de posiciones en el que se memoriza la posición del encoder del rodillo motriz de la estación de corte al comienzo y final de cada figura respecto al eje virtual. Así se conoce la distancia de cinta recorrida durante cada figura del troquel. Con este valor se calcula la impregnación de sustancia adhesiva en la estación de impregnación, incorporando así el error entre las relaciones de avance de la cinta respecto al corte, en el espacio entre cada impregnación y acotado a una vuelta de troquel. By means of a user interface, the starting and ending degrees of each figure are selected so that, when connecting the machine or when necessary, a position capture mode in which the position of the drive roller encoder of the cutting station at the beginning and end of each figure is memorized with respect to the virtual axis. Thus, the distance of tape traveled during each figure of the die is known. With this value the impregnation of adhesive substance in the impregnation station is calculated, thus incorporating the error between the advancement ratios of the tape with respect to the cut, in the space between each impregnation and limited to a die turn.
El ajuste de la tensión de tracción de la cinta se realiza controlando la tensión de desbobinado y controlando la tensión y el torque de bobinado de la merma. Adjusting the tension of the tape is done by controlling the unwinding tension and controlling the tension and the winding torque of the waste.
BREVE DESCRIPCIÓN DE LAS FIGURAS BRIEF DESCRIPTION OF THE FIGURES
Para completar la descripción y con objeto de ayudar a una mejor comprensión de las características de la invención, se acompaña a esta memoria descriptiva, como parte integrante de la misma, un conjunto de dibujos en dónde con carácter ilustrativo y no limitativo, se ha representado lo siguiente: To complete the description and in order to help a better understanding of the characteristics of the invention, this specification is accompanied, as an integral part thereof, by a set of drawings where, with an illustrative and non-limiting nature, it has been represented the next:
La figura 1 representa una vista en perspectiva de la máquina de fabricación de bandas depilatorias. Figure 1 represents a perspective view of the depilatory strip manufacturing machine.
La figura 2 representa otra vista en perspectiva de la máquina de fabricación de bandas depilatorias en la que se ha representado un detalle de la estación de corte. Figure 2 represents another perspective view of the depilatory strip manufacturing machine in which a detail of the cutting station has been represented.
Figura 3 representa una vista del sistema de tracción de desbobinado. Figure 3 represents a view of the unwinding traction system.
Figuras 4A-B representan unas vistas en perspectiva de la estación de corte en la que se observan el troquel vinculado al rodillo motriz y el sistema de tracción de corte. Figures 4A-B represent perspective views of the cutting station in which the die linked to the driving roller and the cutting traction system are observed.
A continuación se proporciona una lista de los distintos elementos representados en las figuras que integran la invención: Below is a list of the different elements represented in the figures that make up the invention:
1. Estación de alimentación 1. Feeding station
2. Bobina 2. Coil
3. Eje de soporte 4. Cinta 3. Support shaft 4. Tape
5. Tensor 5. Tensioner
6. Servomotor del tensor 6. Tensioner servo motor
7. Rodillo motriz tensor 7. Tensioning drive roller
8. Sistema de ajuste de la presión del tensor 8. Tensioner pressure adjustment system
9. Estación de impregnación 9. Impregnation station
10. Estación de corte 10. Cutting station
11. Troquel 11. Die
12. Rodillo motriz de entrada 12. Input drive roller
13. Servomotor de entrada 13. Input servo motor
14. Rodillo motriz de la cortadora 14. Cutter drive roller
15. Servomotor de la cortadora 15. Cutter servo motor
16. Banda depilatoria 16. Depilatory band
17. Merma 17. Loss
18. Cinta transportadora 18. Conveyor belt
19. Estación de tracción 19. Traction station
20. Servomotor de tracción 20. Traction servo motor
21. Rodillo motriz de tracción 21. Traction drive roller
22. Sistema de ajuste de la presión de tracción 22. Traction pressure adjustment system
23. Estación de bobinado 23. Winding station
24. Eje de recogida 24. Pickup shaft
25. Servomotor de recogida 25. Pickup servomotor
26. Sistema de transmisión 26. Transmission system
27. Bobina de recogida 27. Pickup coil
28. Sistema de ajuste de la presión de la estación de corte 28. Cutting station pressure adjustment system
DESCRIPCIÓN DETALLADA DETAILED DESCRIPTION
La presente invención no debe verse limitada a la forma de realización aquí descrita. Otras configuraciones pueden ser realizadas por los expertos en la materia a la vista de la presente descripción. En consecuencia, el ámbito de la invención queda definido por las siguientes reivindicaciones. The present invention should not be limited to the embodiment described herein. Other configurations can be made by those skilled in the art in light of the present description. Accordingly, the scope of the invention is defined by the following claims.
Las bandas depilatorias que se fabrican con la máquina que se describe son del tipo de las que comprenden un sustrato, preferentemente de un material parcialmente elástico (como por ejemplo papel), sobre el que se encuentra una sustancia adhesiva, preferentemente cera. En este caso, la máquina y el procedimiento están preferentemente configurados para fabricar bandas depilatorias con bordes curvos. Las bandas se obtienen cortando, con la forma deseada, los sustratos ya impregnados con la cera. The depilatory strips that are manufactured with the machine described are of the type that comprise a substrate, preferably made of a partially elastic material (such as paper), on which is an adhesive substance, preferably wax. In this case, the machine and method are preferably configured to manufacture depilatory bands with curved edges. The bands are obtained by cutting, with the desired shape, the substrates already impregnated with the wax.
La invención permite fabricar las bandas de forma continua, asegurando una correcta alineación de la sustancia adhesiva (cera) en el sustrato sobre el que se posiciona y respecto al troquel de corte mediante el que se obtiene la banda. La sustancia adhesiva debe quedar centrada en la banda depilatoria para que, el perímetro libre de sustancia adhesiva pueda ser empleado por el usuario para coger la banda y tirar de ella. The invention allows the bands to be manufactured continuously, ensuring a correct alignment of the adhesive substance (wax) on the substrate on which it is positioned and with respect to the cutting die by which the band is obtained. The adhesive substance must be centered on the depilatory strip so that the adhesive substance-free perimeter can be used by the user to grasp the strip and pull it.
En un ejemplo de realización, las bandas obtenidas tienen un cuatro lados, dos de ellos paralelos entre sí (el corte se realiza en dirección longitudinal de la banda) y otros dos lados curvos (que unen los lados paralelos). In an exemplary embodiment, the strips obtained have four sides, two of them parallel to each other (the cut is made in the longitudinal direction of the strip) and two other curved sides (joining the parallel sides).
En la figura 1 se ha representado una vista en perspectiva de la máquina de fabricación de bandas depilatorias. Como se puede apreciar, la máquina está configurada para recibir una bobina de cinta de material de sustrato (como por ejemplo papel) que se va desbobinando y se hace pasar por un recorrido a lo largo de toda la máquina. En dicha cinta se dispone la sustancia adhesiva (generalmente cera) de forma discontinua, dejando un espacio libre entre una impregnación y la siguiente. Figure 1 shows a perspective view of the depilatory strip manufacturing machine. As can be seen, the machine is configured to receive a roll of substrate material tape (such as paper) that is unwound and passed through a path through the entire machine. In said tape, the adhesive substance (generally wax) is arranged discontinuously, leaving a free space between one impregnation and the next.
Posteriormente la cinta se corta, con un troquel rotatorio como el que se puede ver en el detalle de la figura 2, para obtener por una parte las bandas depilatorias y por otra parte una merma que se recoge en continuo. La merma es el sobrante de la cinta que no se ha empleado como sustrato de las bandas. Subsequently, the tape is cut, with a rotating die such as the one that can be seen in the detail of figure 2, to obtain, on the one hand, the depilatory strips and, on the other, a waste that is collected continuously. The waste is the excess of the tape that has not been used as a substrate for the bands.
La clave de la invención es mantener la velocidad de la cinta constante a lo largo de su recorrido por la máquina. Hay que tener en cuenta que, como la merma también se recoge en continuo, la tensión que se aplica sobre ella también afecta al posicionamiento de la cinta. Como el sustrato de las bandas depilatorias es de un material que es al menos parcialmente elástico, es esencial mantener dicha velocidad para evitar elongaciones incontroladas que derivan en desalineaciones acumulativas. Estas desalineaciones provocarían que la impregnación de la cera y/o el corte no estuvieran centrados en la cinta. En las máquinas actuales, para minimizar las desalineaciones, se hace variar la relación mecánica con una reductora variable. Es decir, cuando se observa una desviación en la impregnación, de manera manual se ajustan las relaciones o el momento de corte. The key to the invention is to keep the speed of the belt constant throughout its journey through the machine. It must be taken into account that, as the waste is also collected continuously, the tension applied to it also affects the positioning of the belt. Since the substrate of the depilatory bands is made of a material that is at least partially elastic, it is essential to maintain this speed to avoid uncontrolled elongations that lead to cumulative misalignments. These misalignments would cause the impregnation of the wax and / or the cut not to were centered on the tape. In current machines, to minimize misalignment, the mechanical ratio is varied with a variable gearbox. That is, when a deviation in impregnation is observed, the ratios or shear moment are manually adjusted.
Así pues, la máquina de la presente invención comprende una estación de alimentación (1) con un eje de soporte (2) configurado para recibir una bobina (2) de cinta (4) de material de sustrato. A continuación se encuentra un tensor (5) (estación de tracción de desbobinado) que es el encargado de aplicar una determinada tensión sobre la cinta (4) para realizar la operación de desbobinado. Thus, the machine of the present invention comprises a feeding station (1) with a support shaft (2) configured to receive a reel (2) of tape (4) of substrate material. Next there is a tensioner (5) (unwinding traction station) that is in charge of applying a certain tension on the tape (4) to carry out the unwinding operation.
Como se puede ver en la figura 3, dicho tensor (5) comprende un servomotor del tensor (6) vinculado a un rodillo motriz tensor (7) para su accionamiento. Asimismo comprende un sistema de ajuste de presión del tensor (8) que comprende al menos un rodillo de ajuste, enfrentado al rodillo motriz tensor (7), y con posibilidad de desplazamiento respecto a él para alejarse o acercarse. La cinta (4) pasa a través del rodillo de ajuste y del rodillo motriz tensor (7), y el sistema de ajuste de presión del tensor (8) aplica una mayor o menor fuerza sobre dicha cinta (4) en función de la posición en la que sitúe el primer rodillo de ajuste. As can be seen in Figure 3, said tensioner (5) comprises a tensioner servomotor (6) linked to a tensioning drive roller (7) for its drive. It also comprises a tensioner pressure adjustment system (8) comprising at least one adjustment roller, facing the tensioning drive roller (7), and with the possibility of movement with respect to it to move away or approach. The belt (4) passes through the adjustment roller and the tensioning drive roller (7), and the tensioner pressure adjustment system (8) applies a greater or lesser force on said belt (4) depending on the position where you place the first adjustment roller.
A continuación del tensor se encuentra la estación de impregnación (9) de la sustancia adhesiva (cera generalmente) tal y como se observa en las figuras 1 y 2. Dicha estación de impregnación (9) está configurada para aplicar de forma discontinua la sustancia adhesiva en la cinta (4), para lo cual realiza dos ciclos. En el primer ciclo se impregna la cinta (4), en el centro de la zona que va a recortarse para formar la banda depilatoria. En el segundo ciclo no se realiza impregnación, dejando así un espacio libre de cera entre lo que van a ser dos bandas consecutivas. Following the tensioner is the impregnation station (9) of the adhesive substance (generally wax) as seen in Figures 1 and 2. Said impregnation station (9) is configured to apply the adhesive substance discontinuously on the belt (4), for which it performs two cycles. In the first cycle, the tape (4) is impregnated, in the center of the area to be trimmed to form the depilatory band. In the second cycle, no impregnation is carried out, thus leaving a free space of wax between what will be two consecutive bands.
Preferentemente, la estación de impregnación de cera (9) comprende un circuito con una bomba dosificadora conectada a un depósito de sustancia adhesiva y a una boquilla configurada para aplicar la sustancia adhesiva sobre la cinta (4). La bomba está conectada también a un variador de frecuencia que permite modificar la velocidad de dicha bomba de dosificación para que, en función de la velocidad se aplique más o menos sustancia adhesiva, en más o menos tiempo y el peso de la misma sea siempre el correcto. De esta manera se ajusta la cantidad de sustancia adhesiva que se impregna en cada ciclo. La estación de impregnación de cera (9) dispone también de una válvula dosificadora que distribuye el paso de la sustancia adhesiva hacia la boquilla, o hacia el depósito en el segundo ciclo, evitando así sobrepresiones en el circuito. Puede comprender también un sistema de regulación de la temperatura con una pluralidad de resistencias térmicas, encargadas de mantener la temperatura deseada homogéneamente por todo el circuito por el que fluye la sustancia adhesiva para evitar que se solidifique. Preferably, the wax impregnation station (9) comprises a circuit with a metering pump connected to a reservoir of adhesive substance and to a nozzle configured to apply the adhesive substance to the tape (4). The pump is also connected to a frequency variator that allows modifying the speed of said dosing pump so that, depending on the speed, more or less adhesive substance is applied in more or less time and its weight is always the same. Right. This adjusts the amount of adhesive substance it is impregnated in each cycle. The wax impregnation station (9) also has a metering valve that distributes the passage of the adhesive substance towards the nozzle, or towards the reservoir in the second cycle, thus avoiding overpressures in the circuit. It can also comprise a temperature regulation system with a plurality of thermal resistances, responsible for maintaining the desired temperature homogeneously throughout the circuit through which the adhesive substance flows to prevent it from solidifying.
Una vez impregnada la cera en la cinta (4), ésta continua avanzando hacia una estación de corte (10) que comprende el troquel (11) de corte y un sistema de tracción de la cinta. En las figuras 4A-B se ha representado la estación de corte (10) desde dos perspectivas diferentes. En la estación de corte se encuentran dos rodillos motrices, más concretamente un rodillo motriz de entrada (12) y un rodillo motriz de la cortadora (14). Cada uno de ellos está acoplado a un servomotor (servomotor de entrada (13) y servomotor de la cortadora (15). Once the wax has been impregnated in the tape (4), it continues advancing towards a cutting station (10) comprising the cutting die (11) and a tape traction system. Figures 4A-B show the cutting station (10) from two different perspectives. In the cutting station there are two drive rollers, more specifically an input drive roller (12) and a cutter drive roller (14). Each of them is coupled to a servomotor (input servomotor (13) and cutter servomotor (15).
En la figura 4A se muestran el rodillo motriz de entrada (12), que está enfrentado a un sistema de ajuste de presión de la estación de corte (13) que comprende al menos un rodillo de ajuste, enfrentado al rodillo motriz de entrada (12) y con posibilidad de desplazamiento respecto a él para alejarse o acercase, ajustando así la presión de tracción que se aplica sobre la cinta (4). Figure 4A shows the input drive roller (12), which faces a pressure adjustment system of the cutting station (13) comprising at least one adjustment roller, facing the input drive roller (12 ) and with the possibility of displacement with respect to it to move away or closer, thus adjusting the traction pressure applied on the belt (4).
En la figura 4B se observa que, el rodillo motriz de la cortadora (14), que está vinculado al servomotor de la cortadora (15), está enfrentado al troquel (11). La cinta (4) se desplaza entre el rodillo motriz de la cortadora (14) y el troquel (11), generando así las bandas depilatorias (16) y una merma (17) que, en la máquina propuesta, se recoge en continuo. El troquel (11) está asimismo accionado por el servomotor de la cortadora (15) al que está vinculado mediante un mecanismo de transmisión, que puede comprender por ejemplo unas ruedas dentadas. In figure 4B it can be seen that the drive roller of the cutter (14), which is linked to the servo motor of the cutter (15), faces the die (11). The tape (4) moves between the drive roller of the cutter (14) and the die (11), thus generating the depilatory bands (16) and a waste (17) that, in the proposed machine, is collected continuously. The die (11) is also driven by the servo motor of the cutter (15) to which it is linked by means of a transmission mechanism, which may comprise, for example, toothed wheels.
Adicionalmente, la estación de corte (10) comprende un sistema de ajuste axial, configurado para desplazar axialmente la estación de corte (10), o al menos el troquel (11), para centrarla sobre la cinta (4). El desplazamiento se puede realizar mediante elementos roscados que unen un soporte de la estación de corte (10), sobre el que está montada, con un elemento fijo de la máquina, como por ejemplo un bastidor de la máquina y que permiten dicho movimiento relativo. Additionally, the cutting station (10) comprises an axial adjustment system, configured to axially move the cutting station (10), or at least the die (11), to center it on the belt (4). The movement can be carried out by means of threaded elements that join a support of the cutting station (10), on which It is mounted, with a fixed element of the machine, such as a machine frame, and that allow said relative movement.
En la figura 2 se puede observar cómo las bandas depilatorias (16) se recogen después del troquelado, por ejemplo dispuestas sobre una cinta transportadora (18). Se observa también cómo la merma (17) se dirige hacia la siguiente estación de la máquina, en este caso una estación de tracción (19) de merma. Como se puede ver en la figura, la merma (17) es un “negativo” de las bandas depilatorias en la cinta (4). La estación de tracción (19) de merma es similar al tensor (5), es decir, comprende un servomotor de tracción (20) vinculado a un rodillo motriz de tracción (21). Asimismo comprende un sistema de ajuste de la presión de tracción (22) que comprende al menos un rodillo de ajuste que se acerca o aleja del rodillo motriz de tracción (21) en función de la presión que se quiera ejercer sobre la merma (17). La merma (17) es la cinta (4) sobrante tras el corte por lo que, la presión que se ejerce sobre ella está directamente vinculada a la velocidad de la cinta (4) a lo largo de la máquina. Como se ha descrito previamente, es esencial mantener constante la velocidad de desplazamiento lineal de la merma para asegurar el correcto centrado de la sustancia adhesiva en la banda depilatoria. In figure 2 it can be seen how the depilatory bands (16) are collected after punching, for example arranged on a conveyor belt (18). It is also observed how the shrinkage (17) is directed towards the next machine station, in this case a shrinkage traction station (19). As can be seen in the figure, the loss (17) is a "negative" of the depilatory bands on the tape (4). The shrinkage traction station (19) is similar to the tensioner (5), that is, it comprises a traction servomotor (20) linked to a traction drive roller (21). It also comprises a traction pressure adjustment system (22) that comprises at least one adjustment roller that approaches or moves away from the traction drive roller (21) depending on the pressure to be exerted on the shrinkage (17) . The waste (17) is the tape (4) left over after cutting, so the pressure exerted on it is directly linked to the speed of the tape (4) throughout the machine. As previously described, it is essential to keep the linear displacement speed of the thinning constant to ensure correct centering of the adhesive substance on the depilatory band.
Asimismo, la máquina comprende una estación de bobinado (23) que se muestra en la figura 5. Esta estación está configurada para enrollar la merma (17) controlando, mediante una unidad de control de la máquina, el par de giro de un eje de recogida (24) alrededor de que se enrolla. Para ello el eje de recogida (24) está vinculado a un servomotor de recogida (25) mediante un sistema de transmisión (26). Además comprende un sistema de inflado para poder sujetar la merma (17) sin necesidad de elementos de sujeción adicional. Para retirar la bobina de merma (17) solo es necesario desinflar unas membranas de un sistema de inflado de la máquina y extraerla. Likewise, the machine comprises a winding station (23) shown in figure 5. This station is configured to wind the waste (17) by controlling, by means of a machine control unit, the torque of a shaft of collection (24) around which it is wound. For this, the collection shaft (24) is linked to a collection servomotor (25) by means of a transmission system (26). It also comprises an inflation system to be able to hold the shrinkage (17) without the need for additional fastening elements. To remove the shrink coil (17) it is only necessary to deflate some membranes of an inflation system of the machine and remove it.
La estación de tracción (19) de merma es esencial para evitar que las variaciones de tensión provocadas por la estación de bobinado (25) perjudiquen las operaciones de corte debido a la elasticidad de la cinta (4). La máquina comprende asimismo una unidad de control que está configurada para gestionar y controlar todos los elementos que componen la máquina. Los servomotores de la máquina trabajan en lazo cerrado, controlados por unos servoaccionamientos ( drivers ) que están en comunicación entre sí a través de la unidad de control. Estos elementos trabajan con instrucciones en tiempo real. The shrinkage traction station (19) is essential to prevent tension variations caused by the winding station (25) from damaging the cutting operations due to the elasticity of the tape (4). The machine also includes a control unit that is configured to manage and control all the elements that make up the machine. The servo motors of the machine work in a closed loop, controlled by servo drives (drivers) that are in communication with each other through the control unit. These elements work with instructions in real time.
En la máquina de la invención se han empleado servomotores en lugar de motores asincronos accionados con variadores de frecuencia para asegurar la velocidad constante de la cinta (4) y la merma (17). Para conseguir esto es necesario que la relación entre todos los ejes de tracción de la cinta (4) esté lo más sincronizada posible teniendo en cuenta los diámetros de los distintos rodillos motrices (rodillo motriz tensor (7), rodillo motriz de entrada (12), rodillo motriz de la cortadora (14) y rodillo motriz de tracción (21)) son distintos y también lo son los reductores entre servomotores (los servomotores se acoplan a los ejes a través de reductores para obtener así el par suficiente) y la mecánica aplicada a los servomotores. Asimismo las relaciones del tensor deben ser cambiantes para poder implementar el control de tensión aplicada a la cinta de forma automática. In the machine of the invention, servomotors have been used instead of asynchronous motors driven with frequency variators to ensure constant speed of the belt (4) and waste (17). To achieve this, it is necessary that the relationship between all the traction axes of the belt (4) is as synchronized as possible taking into account the diameters of the different driving rollers (tensioning driving roller (7), input driving roller (12) , cutter drive roller (14) and traction drive roller (21)) are different and so are the reducers between servomotors (the servomotors are coupled to the shafts through reducers to obtain enough torque) and the mechanics applied to servo motors. Likewise, the tensioner relationships must be changing to be able to implement the tension control applied to the belt automatically.
Así pues, para asegurar que la sustancia adhesiva (cera) siempre esté centrada respecto a la forma de las bandas depilatorias (16) es necesario eliminar cualquier error acumulativo que pudiera producirse por diferencias en las relaciones de transmisión o por la elasticidad del material de la cinta (4). Aunque la diferencia entre las relaciones sea mínima, son errores acumulativos, por lo que en poco tiempo de producción se produce un descentrado de la cera. Thus, to ensure that the adhesive substance (wax) is always centered with respect to the shape of the depilatory bands (16), it is necessary to eliminate any cumulative error that could occur due to differences in the transmission ratios or due to the elasticity of the material of the tape (4). Although the difference between the relationships is minimal, they are cumulative errors, so that in a short time of production there is a run-out of the wax.
Este problema técnico se consigue solucionar mediante un control de la posición de dosificación de la cera y mediante un control de la posición del troquel (11) que se incluyen en el método de control de la máquina que se describe a continuación. This technical problem is solved by controlling the wax dosing position and by controlling the position of the die (11), which are included in the machine control method described below.
El control de la dosificación de la cera se lleva a cabo mediante un encoder del servomotor de la cortadora (15) (que es el servomotor del cual dependen los demás, es decir, el servomotor master). De esta forma se lleva un control preciso del movimiento de la cinta (4) sobre el rodillo motriz de la cortadora (14), mejorando así la precisión de impregnación. Sin embargo, esta solución por sí sola no permite solventar el problema del error acumulado entre las relaciones de la estación de corte (10) y todos los rodillos motrices encargados de mover la cinta (4) por todo el recorrido. The control of the dosage of the wax is carried out by means of an encoder of the servo motor of the cutter (15) (which is the servo motor on which the others depend, that is, the master servo motor). In this way, precise control of the movement of the tape (4) on the drive roller of the cutter (14) is carried out, thus improving the impregnation precision. However, this solution by itself does not allow to solve the problem of the accumulated error between the relations of the cutting station (10) and all the driving rollers in charge of moving the belt (4) along the entire path.
Adicionalmente se implementa un eje virtual sincronizado con el rodillo motriz de la cortadora (14) (con su relación correspondiente, definida preferentemente por las ruedas dentadas que traccionan el troquel (11)). Este eje virtual permite conocer la posición de las cuchillas del troquel (11) de forma electrónica ya que el sevomotor de la cortadora (15) está acoplado a una reductora con la que, a través de un engranaje de transmisión (por ejemplo con dos piñones) está vinculado al rodillo de la cortadora (14). Así se consigue saber los grados exactos en los que está posicionado el troquel (11) y en consecuencia llevar un control de la posición exacta de las figuras de corte del troquel (11) (las cuchillas de corte). El eje virtual se resetea a cero en cada vuelta tras la detección, por parte de un detector láser, de un punto concreto del troquel (11) en cada giro completo, asegurando así el punto de inicio en cada vuelta. Additionally, a virtual axis synchronized with the drive roller of the cutter (14) is implemented (with its corresponding relationship, preferably defined by the toothed wheels that drive the die (11)). This virtual axis allows to know the position of the blades of the die (11) electronically since the sevomotor of the cutter (15) is coupled to a reducer with which, through a transmission gear (for example with two pinions ) is linked to the cutter roller (14). Thus it is possible to know the exact degrees in which the die (11) is positioned and consequently to keep track of the exact position of the cutting figures of the die (11) (the cutting blades). The virtual axis is reset to zero in each turn after the detection, by a laser detector, of a specific point of the die (11) in each complete turn, thus ensuring the starting point in each turn.
Con el método de control de la máquina, se recogen datos con la posición del troquel (11) en tiempo real de tal forma que, en el momento que se desee (por ejemplo al conectar la máquina para empezar un ciclo o siempre que se considere necesario) se ejecuta un modo de captura de posiciones que comprende una etapa de memorizar la posición del eje virtual y del encoder del rodillo motriz de la cortadora (14) al comienzo y al final de cada figura de corte (que determina la forma de una banda depilatoria) para conocer la distancia de cinta (4) recorrida durante la longitud de cada figura del troquel (11). En base a estos valores se controla la impregnación de la cera, consiguiendo incorporar el error entre las relaciones de avance de la cinta (4) respecto al troquel (11), en el espacio entre cada impregnación y siempre acotado a una vuelta de troquel (11). With the control method of the machine, data is collected with the position of the die (11) in real time in such a way that, at the desired moment (for example when connecting the machine to start a cycle or whenever it is considered necessary) a position capture mode is executed that comprises a step of memorizing the position of the virtual axis and the encoder of the drive roller of the cutter (14) at the beginning and at the end of each cutting figure (which determines the shape of a depilatory band) to know the distance of tape (4) traveled during the length of each figure of the die (11). Based on these values, the impregnation of the wax is controlled, managing to incorporate the error between the advance relationships of the tape (4) with respect to the die (11), in the space between each impregnation and always limited to one die turn ( eleven).
Asimismo el método de control permite realizar un control de la tensión de desbobinado (es decir, la tensión que se aplica sobre la cinta (4) en el tensor (5) mediante un sistema de “tenser” (sistema electrónico de control de tensión de la cinta (4)) que permite separar una variable correspondiente con el peso de la bobina (2) de una variable de tensión en la cinta (4). Para ello se supervisa en tiempo real el par que está aplicando el servomotor de la cortadora (15) al traccionar la cinta (4) para poder variar en tiempo real la relación del servomotor del rodillo motriz tensor (6) con respecto a dicho servomotor de la cortadora (15), buscando una consigna de par predeterminada, introducida a través de una interface de usuario. Se consigue así un control muy preciso de la tensión entre el rodillo motriz tensor (7) y el eje de soporte (3) (sobre el que se encuentra la bobina (2) y que no se tiene en cuenta en el peso de la bobina) sin que afecte el peso de la bobina (2) en cada momento a la tensión sobre la cinta (4). Likewise, the control method allows to control the unwinding tension (that is, the tension applied to the tape (4) in the tensioner (5) by means of a “tenser” system (electronic tension control system of the belt (4)) that allows to separate a variable corresponding to the weight of the reel (2) from a tension variable on the belt (4). To do this, the torque applied by the servo motor of the cutter is monitored in real time (15) when pulling the belt (4) to be able to vary in real time the ratio of the tension drive roller servo motor (6) with with respect to said servo motor of the cutter (15), looking for a predetermined torque command, entered through a user interface. This achieves a very precise control of the tension between the tensioning drive roller (7) and the support shaft (3) (on which the coil (2) is located and which is not taken into account in the weight of the coil ) without affecting the weight of the coil (2) at any time to the tension on the belt (4).
El método de control de la presente invención puede comprender también una etapa de control de la tensión de bobinado de la merma (17) que permite obtener una alta precisión en la posición del corte respecto a la sustancia adhesiva ya impregnada. Este control se realiza mediante sincronización de la velocidad de la cinta (4) en la estación de corte (10) y la velocidad de la cinta (4) en la estación de tracción (19) de merma. The control method of the present invention can also comprise a step of control of the winding tension of the waste (17) that allows to obtain a high precision in the position of the cut with respect to the adhesive substance already impregnated. This control is carried out by synchronizing the speed of the belt (4) in the cutting station (10) and the speed of the belt (4) in the shrinkage traction station (19).
Por otra parte, se realiza también un control del torque de bobinado de la merma (17). La merma (17) se va enrollado, a modo de bobina de salida (27) sobre un eje de recogida (24). El diámetro de la bobina de salida (27) va aumentando conforme aumenta la cantidad de merma (17) (proporcional a la disminución de diámetro de la bobina (2) de cinta (4) de la estación de alimentación (1)). Debido a dicho diámetro cambiante, no se puede hacer un sincronismo con el rodillo motriz de la cortadora (14) (a partir del que se controlan los demás elementos de la máquina) ya que la relación de transmisión cambia a cada vuelta. On the other hand, a control of the winding torque of the waste is also carried out (17). The waste (17) is wound, as an output coil (27) on a collection shaft (24). The diameter of the output reel (27) increases as the amount of waste (17) increases (proportional to the decrease in diameter of the reel (2) of tape (4) of the feeding station (1)). Due to said changing diameter, it is not possible to make a synchronism with the driving roller of the cutter (14) (from which the other elements of the machine are controlled) since the transmission ratio changes at each turn.
Además, la anchura de la merma (17) es muy pequeña pues el sobrante de la cinta (4) debe ser lo mínimo posible para reducir costes de fabricación. Esto conlleva roturas de la merma (17) en cuanto se aumenta levemente la tensión. Furthermore, the width of the shrinkage (17) is very small since the excess of the tape (4) must be as little as possible to reduce manufacturing costs. This leads to shrinkage breaks (17) as soon as the tension is slightly increased.
Para solucionar este problema, el método de control comprende una etapa de control del torque de bobinado de manera que el servomotor de recogida (25) solo aplica el par deseado introducido a través de la interfaz de usuario, aplicando una rampa de incremento y decremento del torque aplicado. Es decir, se corrigen las desviaciones de tensión para llevar el parámetro de par hasta un valor predeterminado pero de una forma “suave”, sin cambios bruscos que provocarían una rotura de la merma (17). De esta forma se consigue bobinar correctamente la merma (17) completa. Se trata de un control adicional por el cual se elimina el factor de que el diámetro de la bobina de recogida (27), al ir cambiando, varíe la velocidad de la merma (17) (afectando también a la velocidad de la cinta (4) a lo largo del recorrido de la máquina) y la pueda romper. Por eso esencial controlar el par, es decir, controlar la fuerza que se aplica sobre la cinta (4) y la merma (17) para que no se rompa. To solve this problem, the control method comprises a winding torque control stage so that the pick-up servomotor (25) only applies the desired torque entered through the user interface, applying an increase and decrease ramp of the winding torque. applied torque. That is, the voltage deviations are corrected to bring the torque parameter to a predetermined value but in a "smooth" way, without sudden changes that would cause a breakdown of the loss (17). In this way, the complete waste (17) is wound correctly. This is an additional control by which the factor that the diameter of the take-up reel (27), as it changes, varies the speed of the shrinkage (17) (also affecting the speed of the belt (4) is eliminated. ) along the path of the machine) and may break it. For this reason, it is essential to control the torque, that is, to control the force applied to the belt (4) and the loss (17) so that it does not break.

Claims

REIVINDICACIONES
1. Máquina de fabricación de bandas depilatorias que comprende una estación de alimentación (1) destinada a recibir una bobina (2) de cinta (4) que se emplea como sustrato de las bandas depilatorias (16); una estación de impregnación (9) de una sustancia adhesiva en la cinta (4) configurada para impregnar dicha sustancia adhesiva de forma discontinua dejando un espacio libre entre impregnaciones; una estación de corte (10) que comprende un troquel rotatorio (11) para troquelado de la cinta (4) y obtención de las bandas depilatorias (16) y una merma (17), y una estación de bobinado (19) de la merma (17); donde la máquina está caracterizada por que: comprende un tensor (5), dispuesto entre la estación de alimentación (1) y la estación de impregnación (9) y que comprende un servomotor del tensor (6) vinculado a un rodillo motriz tensor (7), y un sistema de ajuste de presión del tensor (8) configurado para regular la presión que se aplica sobre la cinta (4) en el tensor; la estación de corte (10) dispone además de un sistema de tracción de la cinta, con un rodillo motriz de entrada (12) acoplado a un servomotor de entrada (13), y enfrentado a un sistema de ajuste de presión de la estación de corte (28) configurado para regular la presión que se ejerce sobre la cinta (4) y dispone de un rodillo motriz de la cortadora (14) que está acoplado a un servomotor de la cortadora (15) y enfrentado al troquel (11); comprende una estación de tracción (19) de merma dispuesta entre la estación de corte (10) y la estación de bobinado (25) y que comprende un servomotor de tracción (20) vinculado a un rodillo motriz de tracción (21) y un sistema de ajuste de la presión de tracción (22) configurado para regular la presión que se ejerce sobre la merma (17); la estación de bobinado (23) de la merma (17) comprende un eje de recogida (24) configurado para girar, a través de un sistema de transmisión (26), accionado por un servomotor de recogida (25); - comprende una unidad de control configurada para gestionar y comunicar entre sí todos los servomotores. A depilatory strip manufacturing machine comprising a feeding station (1) intended to receive a coil (2) of tape (4) that is used as a substrate for the depilatory strips (16); a station for impregnating an adhesive substance on the tape (4) configured to impregnate said adhesive substance discontinuously leaving a free space between impregnations; a cutting station (10) comprising a rotating die (11) for punching the tape (4) and obtaining the depilatory bands (16) and a waste (17), and a winding station (19) of the waste (17); where the machine is characterized in that: it comprises a tensioner (5), arranged between the feeding station (1) and the impregnation station (9) and comprising a tensioner servomotor (6) linked to a tensioning drive roller (7 ), and a tensioner pressure adjustment system (8) configured to regulate the pressure applied to the belt (4) on the tensioner; The cutting station (10) also has a belt traction system, with an input drive roller (12) coupled to an input servomotor (13), and facing a pressure adjustment system of the cutter (28) configured to regulate the pressure exerted on the belt (4) and has a drive roller of the cutter (14) that is coupled to a servo motor of the cutter (15) and facing the die (11); It comprises a waste traction station (19) arranged between the cutting station (10) and the winding station (25) and comprising a traction servomotor (20) linked to a traction drive roller (21) and a system adjustment of the traction pressure (22) configured to regulate the pressure exerted on the shrinkage (17); the winding station (23) of the waste (17) comprises a collection shaft (24) configured to rotate, through a transmission system (26), driven by a collection servomotor (25); - it comprises a control unit configured to manage and communicate with each other all the servomotors.
2. Máquina de fabricación de bandas depilatorias según la reivindicación 1 en la que el sistema de ajuste de la presión del tensor (8) comprende al menos un rodillo de ajuste, enfrentado al rodillo motriz tensor (7) y con posibilidad de desplazamiento respecto a dicho rodillo motriz tensor (7) para aplicar una tensión mayor o menor sobre la cinta (4) que pasa a través del rodillo motriz tensor (7) y el rodillo de ajuste. 2. Depilatory strip manufacturing machine according to claim 1, in which the tensioner pressure adjustment system (8) comprises at least one adjustment roller, facing the tensioning drive roller (7) and with the possibility of movement with respect to said tensioning drive roller (7) to apply a greater or lesser tension on the belt (4) passing through the tensioning driving roller (7) and the adjusting roller.
3. Máquina de fabricación de bandas depilatorias según una cualquiera de las reivindicaciones anteriores en la que el sistema de ajuste de la presión de la estación de corte (28) comprende al menos un rodillo de ajuste, enfrentado al rodillo motriz de entrada (12) y con posibilidad de desplazamiento respecto a dicho rodillo motriz de entrada (12) para aplicar una tensión mayor o menor sobre la cinta (4) que pasa a través del rodillo motriz de entrada (12) y el rodillo de ajuste. 3. Depilatory strip manufacturing machine according to any one of the preceding claims, in which the pressure adjustment system of the cutting station (28) comprises at least one adjustment roller, facing the input drive roller (12) and with the possibility of movement with respect to said input drive roller (12) to apply a greater or lesser tension on the belt (4) that passes through the input drive roller (12) and the adjustment roller.
4. Máquina de fabricación de bandas depilatorias según una cualquiera de las reivindicaciones anteriores en la que en la que el sistema de ajuste de la presión de tracción (22) comprende al menos un rodillo de ajuste, enfrentado al rodillo motriz de tracción (21) y con posibilidad de desplazamiento respecto a dicho rodillo motriz de tracción (21) para aplicar una tensión mayor o menor sobre la cinta (4) que pasa a través del rodillo motriz de de tracción (21) y el rodillo de ajuste. Depilatory strip manufacturing machine according to any one of the preceding claims, in which the traction pressure adjustment system (22) comprises at least one adjustment roller, facing the traction drive roller (21) and with the possibility of movement with respect to said traction drive roller (21) to apply a greater or lesser tension on the belt (4) that passes through the traction drive roller (21) and the adjustment roller.
5. Máquina de fabricación de bandas depilatorias según una cualquiera de las reivindicaciones anteriores en la que la estación de impregnación (9) comprende un circuito con una bomba dosificadora conectada a un depósito de sustancia adhesiva y a una boquilla configurada para aplicar la sustancia adhesiva sobre la cinta (4). Depilatory strip manufacturing machine according to any one of the preceding claims, in which the impregnation station (9) comprises a circuit with a metering pump connected to a reservoir of adhesive substance and to a nozzle configured to apply the adhesive substance to the tape (4).
6. Máquina de fabricación de bandas depilatorias según la reivindicación 5 en la que la estación de impregnación (9) comprende una válvula dosificadora configurada para distribuir el paso de la sustancia adhesiva hacia la boquilla o hacia el depósito y/o un sistema de regulación de temperatura con una pluralidad de resistencias térmicas configurado para mantener la temperatura de la sustancia adhesiva en el circuito. Depilatory strip manufacturing machine according to claim 5, in which the impregnation station (9) comprises a metering valve configured to distribute the passage of the adhesive substance towards the nozzle or towards the reservoir and / or a regulation system of temperature with a plurality of thermal resistors configured to maintain the temperature of the adhesive substance in the circuit.
7. Máquina de fabricación de bandas depilatorias según una cualquiera de las reivindicaciones anteriores en la que la estación de corte (10) comprende un sistema de ajuste axial, configurado para desplazar axialmente la estación de corte (10), o al menos el troquel (11), para centrarla sobre la cinta (4) desplazando un soporte de la estación de corte (10), sobre el que está montada, respecto a un elemento fijo de la máquina. Depilatory strip manufacturing machine according to any one of the preceding claims, in which the cutting station (10) comprises an axial adjustment system, configured to axially move the cutting station (10), or at least the die ( 11), to center it on the belt (4) by moving a support of the cutting station (10), on which it is mounted, with respect to a fixed element of the machine.
8. Método de control de una máquina de fabricación de cintas depilatorias como la descrita en una de las reivindicaciones 1 a 7 caracterizado por que comprende las siguientes etapas: implementar un eje virtual sincronizado con el rodillo motriz de la cortadora (14) a través de su relación con el troquel (11) mediante el sistema de transmisión para obtener los grados de giro del troquel (11) y conocer la posición exacta de cada figura de corte del troquel (11); establecer, en cada giro completo del troquel (11), un cero para el eje virtual correspondiente con un punto concreto del troquel (11); memorizar la posición del eje virtual y de un encoder del rodillo motriz de la cortadora (14) al comienzo y al final de cada figura de corte para conocer la distancia de cinta (4) recorrida durante la longitud de cada figura del troquel (11); determinar el error en la relación de avance de la cinta (4) respecto al corte en base a la posición del eje virtual en la operación de corte; incorporar dicho error en el espacio libre entre cada impregnación en la estación de impregnación (9), acotado a una vuelta del troquel (11). 8. Control method of a depilatory tape manufacturing machine as described in one of claims 1 to 7, characterized in that it comprises the following steps: implementing a virtual axis synchronized with the drive roller of the cutter (14) through its relationship with the die (11) by means of the transmission system to obtain the degrees of rotation of the die (11) and to know the exact position of each cutting figure of the die (11); establishing, in each complete rotation of the die (11), a zero for the virtual axis corresponding to a specific point of the die (11); memorize the position of the virtual axis and of an encoder of the drive roller of the cutter (14) at the beginning and at the end of each cutting figure to know the distance of tape (4) traveled during the length of each figure of the die (11) ; determining the error in the advance ratio of the tape (4) with respect to cutting based on the position of the virtual axis in the cutting operation; incorporate said error in the free space between each impregnation in the impregnation station (9), limited to one turn of the die (11).
9. Método de control según la reivindicación 8 en el que el reseteo del eje virtual en cada giro se realiza después de una etapa de detectar, mediante un detector láser, el punto concreto del troquel (11) determinado como cero. Control method according to claim 8, in which the resetting of the virtual axis in each rotation is carried out after a step of detecting, by means of a laser detector, the specific point of the die (11) determined as zero.
10. Método de control según una cualquiera de las reivindicaciones 8 a 9 en el que se realiza un control de tensión de desbobinado que comprende las etapas de: controlar, con la unidad de control, en tiempo real el par que se aplica en el servomotor de la cortadora (15); adaptar en tiempo real la relación del servomotor de tracción (20) en función del par aplicado en el servomotor de la cortadora (15) para adaptarlo a una consigna de par predeterminada. Control method according to any one of claims 8 to 9, in which unwinding tension control is carried out, comprising the steps of: controlling, with the control unit, in real time the torque applied to the servomotor of the cutter (15); adapt in real time the ratio of the traction servomotor (20) as a function of the torque applied to the cutter servomotor (15) to adapt it to a predetermined torque command.
11. Método de control según una cualquiera de las reivindicaciones 8 a 10 que comprende una etapa de control de la tensión de bobinado de la merma (17) mediante sincronización de la velocidad de la cinta (4) en la estación de corte (10) y la velocidad de la cinta (4) en la estación de tracción (19) de merma. Control method according to any one of claims 8 to 10, comprising a step of controlling the winding tension of the waste (17) by synchronizing the speed of the belt (4) in the cutting station (10) and the speed of the belt (4) in the traction station (19) of shrinkage.
12. Método de control según una cualquiera de las reivindicaciones 8 a 11 que comprende aplicar en el servomotor de recogida (25) un par predeterminado, aplicando una rampa de incremento y decremento del torque aplicado en él. Control method according to any one of claims 8 to 11, which comprises applying a predetermined torque to the collection servomotor (25), applying a ramp of increasing and decreasing the torque applied to it.
PCT/ES2020/070555 2019-09-17 2020-09-16 Machine for the manufacture of hair removal strips and method of controlling said machine WO2021053255A1 (en)

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Application Number Priority Date Filing Date Title
ES201930804A ES2812600B2 (en) 2019-09-17 2019-09-17 DEPILATORY STRIP MANUFACTURING MACHINE AND CONTROL METHOD OF SAID MACHINE
ESP201930804 2019-09-17

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4824702A (en) * 1986-06-11 1989-04-25 Straub Dale K Transfer adhesive sheet material
US5842469A (en) * 1997-07-03 1998-12-01 Rapp; John D. Method for extending the useful life of a nasal dilator
US20130150867A1 (en) * 2010-05-31 2013-06-13 E.V.F. Delacour Bv. Method manufacturing an epilatory strip and strips obtainable by the method
EP2749186A1 (en) * 2012-10-31 2014-07-02 Cosmewax S.A. Depilatory strip meter-system with double cutting wegdes
ES2668817T3 (en) * 2014-10-23 2018-05-22 Cosmewax, S.A. Procedure for obtaining a hair removal element

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4824702A (en) * 1986-06-11 1989-04-25 Straub Dale K Transfer adhesive sheet material
US5842469A (en) * 1997-07-03 1998-12-01 Rapp; John D. Method for extending the useful life of a nasal dilator
US20130150867A1 (en) * 2010-05-31 2013-06-13 E.V.F. Delacour Bv. Method manufacturing an epilatory strip and strips obtainable by the method
EP2749186A1 (en) * 2012-10-31 2014-07-02 Cosmewax S.A. Depilatory strip meter-system with double cutting wegdes
ES2668817T3 (en) * 2014-10-23 2018-05-22 Cosmewax, S.A. Procedure for obtaining a hair removal element

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ES2812600A1 (en) 2021-03-17

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