FR2575448A1 - INSTALLATION FOR ADJUSTING THE TENSION EXERCISED ON LAMINATE MATERIALS, PARTICULARLY FOR THE MANUFACTURE OF DISPOSABLE HYGIENIC TOWELS - Google Patents

Abstract

THIS INSTALLATION IS INTENDED TO ENSURE THE AUTOMATIC ADJUSTMENT OF THE TENSION OF TWO MATERIALS WHICH IT IS A question of joining together by stratification or of assembling; THIS INSTALLATION INCLUDES TWO FEED ROLLS 16 AND 18 WHICH DELIVER THE SAID MATERIALS. A DELIVERY DEVICE 24, 30 OR 26, 32 UNLOADS EACH MATERIAL IN FILM TO DELIVER IT TO LAMINATION ROLLS 34, 36. MOVABLE ARMS 54, 56 ADJUST THE TENSION ON THE FILM MATERIAL 12, 14. CYLINDERS COMPUTER CONTROLLED TIRES 38 AUTOMATICALLY ADJUST THE POSITIONS OF THE MOBILE ARMS ACCORDING TO A SIGNAL THAT IS TRANSMITTED TO THE COMPUTER BY A DEVICE 82 WHICH MEASURES THE TENSION OF THE LAMINATE COMING OUT OF THE LAMINATION ROLLS.

Description

1 * '

  The present invention relates to an ins-

  tallation used to automatically adjust the tension exerted on materials to be joined by

layering or assembling.

  In the manufacture of disposable sanitary napkins or the like, two materials of the

  film type which have different elastic moduli

  are routed to laminate rolls

  cation. However, the tension of these materials must

  be limited to certain predetermined intervals.

  It has been found that most processing machines must remain within a certain range

  operating voltage to work well.

  This range is determined by the general qualities of the materials to be treated, which requires certain adjustments.

  specific to the speed of the ma-

  china and certain specific levels of unwinding tension. For example, if the tensions are too

  weak, the material does not follow its path correctly

  jet. If the voltages are too high, it may

  to solve problems of tearing, slipping or sticking

  of the material. When the elasticity of the materials

  The tension of the belts varies in the machine.

  The present invention requires automatically adjustable tensioning devices which act on the unwinding devices of the two materials, which have to be joined by lamination or to assemble a downstream tension detector acting on the laminated or assembled strip and a logic device. of

setting.

  The principle on which the present invention is based consists in automatically varying the

  tension of the unwinding device of the two materials

  res (within specified limits) in a fixed ratio

  equal to the ratio of their average elasticities

  matives (which are expressed in units of length-

  management per unit or unwinding voltage on any

  the width of the material). De-

  bearings vary automatically to stabilize the reading of the downstream voltage indicator at a manually set target value. Photoelectric sensor devices

  are described in the U.S. Patent N'2.088.984.

  It is the position of the strip which is measured and not

not its thickness.

  -We have used gauges in the past

  constraints and movable arms to control the tension

  sion exerted on a conveyed belt, as described in the U.S. patent. No. 2,753,128, as well as in Japanese Patent No. 44-12163 and only in

British Patent No. 1,371,760.

  The U.S. Patent No. 2,627,296 describes an apparatus comprising means for adjusting the

  tension exerted in a strip of fabric.

  The U.S. Patent No. 3,239,161 describes a drive control mechanism which provides

  a strip of material of great length whose vi-

  tesse and tension are adjustable.

  The U.S. Patent No. 3,510,374 describes an adjusting device which is used to detect a property

  of a moving band and to adjust the band in motion

  in such a way that the desired property is

  uniform over the entire length of the strip.

  The E.UJ.A. n 3,107,679 describes _n an automatic tension adjustment device which uses pneumatic or electric circuitry to keep the tension in a substantially constant

strip of material.

  The U.S. Patent No. 3,762,125 describes a

  device for regulating the application of a material

  - * on- another material by stratification, which uses

  li.se a photoelectric cell 50 which responds to

  indrices 48 carried by the film "F" and which sends the

  foriation to a control box 34 of a clutch 39, le3ruel controls the stretching rollers 38a and 33b in order to keep the two strips aligned one

su; the other. -

  The U.S. Patent No. 4,347,993 describes monitoring and adjustment means which includes a

  control unit that responds to the outputs of the transducer

  tension sensor and a reference voltage selector by adjusting the torque applied to the tension adjustment roller, to adjust in this way

belt tension.

  The invention therefore aims to provide an apparatus for maintaining a viable range of

  film material tension, which is obtained by measuring

  the tension on the laminates coming out of the rolls

stratification water.

  To achieve this object, the invention provides a computer-controlled transformation machine in which films supplied by feed rollers are automatically stretched at rates corresponding to the relative elasticity of the film material. Pneumatically actuated mobile arms are

  in contact with the film material to adjust the

  * tension on this matter. The positions of the movable arms are measured and supplied as inputs to the processing machine's computer, as well as a signal from a device used to measure the final stress on the laminate as it

  comes out of the laminating rollers.

  Other features and benefits of

  the invention will appear during the description

-2575448

  who will follow. The accompanying drawing, given by way of example only, is a schematic diagram of an installation intended for use in a machine

  to automatically adjust the voltage

  sion exerted on the film materials to be laminated-

  As can be seen by referring to the accompanying drawing, the installation according to the invention has the function of automatically varying the tension exerted on each of the two film materials 12 and 14

  in order to maintain the tensions exerted on these materials

  res in desirable intervals.

  The installation 10 includes feed rollers 16 and 18 delivering the sheet materials 12 and 14. Unwinding motors 20 and 22

  drive endless belts 24 and 26 to unwind

  the materials in film 12 and 14. Rolling games

  leaux 30 and 32 can be idle rollers or motor rollers or alternatively tendency rollers (intended to reduce the friction and drag resistance exerted on the strip) which serve to convey

  the film materials 12 and 14 to rolls of stra-

  classification 34 and 36 which are driven separately, or to another similar device used to join the film materials 12 and 14 by stratification and / or

assemble them.

  The installation 10 includes a computer 38 or microprocessor which controls the speed of the motors

  and 22 via its outputs 40 and 42. The elastic module-

  The approximate ticity of each of the film materials 12 and 14 is displayed manually in the computer 38 as input. Movable arms 54 and 56 ("dancer" arms) are mounted on pivots at 50 and 52 and carry

  crazy rollers 58 and 60 around which.

  pass the materials into film 12 and 14. Pneumatic regulators 68 and 70 controlled by computer-generated inputs 72 and 74 operate in combination with pneumatically actuated jacks to adjust the position of the movable arms 54. and 56. The pivots 50 and 52 constitute rotary sensor means serving to capture the angular position of the first and second movable arms 54, 56, and are functionally connected to the computer 38 so that the position of the movable arms 54, 56 is provided as signal quality. input to the computer. This connection is therefore made in such a way that the positions of the mobile arms 54; 56 are transmitted as input signals to said computer, while

  other means of entry are provided for on said computer

l

  tor to manually introduce the relative elasticities

  tives of said first and second film materials.

  The position of the movable arms 54 and 56 is determined by measuring devices 75.-and 76 which transmit signals to the computer 38 serving as input 78 and 80. A measuring device 82 measures the final tension exerted on the laminate composed of the two materials 12 and 14 supplied by the rollers of

stratification 34 and 36.

  The computer 38 is programmed so as to maintain the tension exerted on the film materials 12 and 14 in an optimum interval-in order to avoid sticking, tears or accidental routing defects which would result in defects in the laminate, in adjusting the position of the mobile arms as well as the speed of the unwinding motors, mainly as a function of the input coming from the device 82 for measuring the voltage and the inputs

initials displayed manually.

  The speed of the laminating rollers 34 and 36 can be independent. The speed of the motor 20 is automatically adjusted to maintain or return the movable arm 54 to a fixed position (central or horizontal in the drawing). The pneumatic pressures or loads exerted on the two movable arms are automatically adjusted (in a previously fixed ratio) to keep the tension of the belt at the level

  of sensor 82 within a predetermined interval.

Claims (5)

CLAIMS i - Installation for automatic adjustment of the tension exerted on film materials to be strapped, characterized in that it comprises a first supply roller (16) delivering a first film material (12), means conveyor serving to unwind and convey said first film material, laminating means (34, 36), a movable arm (54) which attacks said first film material, the first pneumatic means (68) serving to adjust said movable arm to vary the tension exerted on said first film material, the second film material (14) carried by a second feed roller ('18), conveying means (26, 32) serving to unwind said second material in film and to convey it to said laminating means (34, 36), a second movable arm (56) which attacks said second material in film and second pneumatic means (70) serving to adjust the position said second movable arm to make v varying the tension exerted on said second film material, a computer (38) and means (82) for measuring the tension exerted on the laminate made of said first film material (12) and said second film material (14) and which are functionally connected to said computer (38) to transmit a signal to it, said computer being functionally connected to said first and second pneumatic means (68, 70) for actuating these pneumatic means by function of said signal supplied by said measuring means (82).   2 - Installation according to claim 1, characterized in that said first and second E mob.iles arms (54: 56; are} pivotally mounted and each   of them is placed between one of said feed rollers   tation ('1t, 18) and said stratification means (34, 36).   3 - Installation according to claim 1, characterized in that said computer (38) comprises   means for manually adjusting the elas-   ticities of said first and second film materials (12, 14).   4 - Installation of automatic adjustment of   voltage. exerted on film materials with stra-   tifier, characterized in that it comprises in combination   naison: a first feed roller (16)   as a first film material (12) means   routing (24, 30) used to unwind and route   ner said first film material, means of   stratification (34, 36), a movable arm (54) which   tackles said first film, first pneumatic means (68) serving to adjust said movable arm (54) to vary the tension exerted on said first film material, said second material   film (14) carried by a second roll of feed   tion (18), conveying means (26, 32) serving to unwind said second material in film and to convey it to said laminating means (34, 36), a second movable arm (56) which attacks said second material film (14) and second pneumatic means (70) for adjusting the position of said second movable arm (56) to vary the tension exerted on said second film material (14), a computer (38) and means ( 82) for measuring the tension exerted on the laminate composed of said first film material (12) and said second   film material (14) and which are functionally connected   nally to said computer (38) to transmit to it   a signal, said computer being connected function-   to said first and second pneumatic means   ticks (68, 70) to activate them depending on the   general emitted by said measuring means (82) and rotary sensor means (50, 52) serving to capture the angular position of said first and second movable arms. - Installation according to claim 4,   characterized in that said rotary sensor means   tifs (50, 52) are operatively connected to said computer (38) so that the position of said movable arms (54, 56) is provided as a signal quality input to said computer.   6 - Installation according to claim 4,   characterized in that said rotary sensor means   tifs (50, 52) are operatively connected to said computer (38) in such a way that the positions of said movable arms (54, 56) are transmitted as input signals to said computer, while other input means are provided on said computer for manually introducing the relative elasticities   said first and second film materials.   7 - Installation of automatic adjustment of   the tension exerted on materials in film with stra--   tifier, these materials being different and routed to   variable tensions from feed rolls--   tation debiting said materials in film, characteristic   in that it comprises adjustable movable arms (54, 56) intended to attack said film material, a computer (38), means making it possible to initially adjust the tension exerted on said materials   in film, means (68, 70) connected to said computer   tor to adjust the position of said movable arms (52,   54) and means (82) for measuring the tension   sion exerted on the laminate and which are connected to said computer in such a way that the loads   exerted on the movable arms (54, 56) are automatically   to adjust the tension of the laminate.