FR2568176A1 - SYSTEM MOUNTED ON A FILM TUBE WINDING MACHINE FOR CONTROLLING A CUTTING DEVICE - Google Patents

Abstract

THE CONTROL SYSTEM OF A CUTTING SYSTEM FOR DIVIDING THE COIL TUBES MANUFACTURED BY A MACHINE FOR WINDING FILM TUBES INCLUDES A COMPUTER 25 WHICH, IN ADDITION TO THE FIXED VALUES INPUT, ALSO PROCESSES THE MEASUREMENT DATA FROM TWO MEASURING SENSORS 15, 26. ONE OF THE MEASURING SENSORS 15 TRANSMITS THE MOVEMENT OF THE FILM TAPE 14 AND THE OTHER SENSOR 26 THE CIRCUMFERENTIAL MOVEMENT OF THE WINDING TUBE OBTAINED ON THE WINDING CHUCK 10 OF THE MACHINE FOR WINDING THE FILM TUBES . THE MEASUREMENT SENSOR 26 PREFERABLY INCLUDES A SENSOR 40 APPLIED AGAINST THE INSIDE FACE OF THE WINDING TUBE REALIZED.

Description

System mounted on a machine for winding film tubes and intended for

order a cutting device

  The present invention relates to a system mounted on a ma-

  china winding film tubes operating continuously, in part

  bottom on a spiral winding machine, and intended to control a cutting member and a carriage supporting said cutting member and capable of advancing and reversing in the direction of advance of the wound tube, the speed of said carriage during the cutting process being equal to the

  tube advance speed, this system comprising a computer which, or

  be fixed values entered, processes the pulses which are

  by an electric pulse generator associated with a roller

  measurer placed on the film sheet leading to the spindle

rolling.

  A system with the characteristics indicated below

  above is the subject of patent DE-PS 27 24 899. It has been found that irregularities in winding the film sheet on the winding mandrel could appear, in particular with sheets of

  thick film. This remark generally concerns the ma-

  chines to be wound in a spiral on which the process of winding-

  This is done using winding belts. In general, these irregularities are certainly minor, but they must be taken into account for the products which require to cut the sections of tube.

according to high precision.

  The object of the present invention is to provide a system of the

  type indicated previously, allowing to detect even irregularities

  tees appearing during the winding process on the mandrel of the machine for winding the film tubes and taking into account the organ -2-

  cutter used to separate the pipe sections.

  In accordance with the present invention, this object is achieved by the system indicated above, in that there is additionally provided a measurement sensor detecting the rotational movement of the wound tube in its circumferential direction, and in that said sensor is

connected to the computer.

  It turned out that by detecting the circumferential movement

  of the coiled tube, a correction value is obtained which allows

  hold tube sections of exactly the same length. In re-

  However, a direct measurement - which might seem appropriate - of the longitudinal movement of the coiled tube cannot provide such precision. This is especially true for the detection of possibilities

  error during longitudinal movement. Due to the movement he-

  coiled tube licoldal, misalignment of the measuring wheel

  relative to the longitudinal direction of the tube can result in an er-

  measurement of the longitudinal movement of the coiled tube. It is necessary

  also take into account disturbances due to the presence of inequality

  bed on the outside of the tube or traces of glue on the wheel

  measured. The measurement sensors intended to detect the movement ctr-

  of the tube perpendicular to its longitudinal direction may

  can be adjusted with great angular precision.

  The additional measurement sensor can advantageously

  include a feeler member applied against the inner face of the tu-

  be, said feeler member being able to have the shape of a rotating wing mounted at the end of the winding mandrel and being able to be designed

  with at least one elastic support end. A feeler organ app-

  folded inside the manufactured tube is protected against any

  intentional adjustment work by operating personnel

  tion and it rests on a tube surface which, thanks to the proximity of the winding mandrel, is absolutely smooth and which is also free of any trace of glue. On small diameter tubes, it

  it may also be advantageous to provide an external measurement sensor

  laughing designed in the form of a Hall generator, which cooperates with at least one of the permanent magnets rotating with and inside the

tube.

  -3- The variations of the longitudinal movement which are caused on the winding mandrel by the slipping of the belts of a spiral winding machine during the formation of the winding are determined by a comparison between the values recorded on the sheet. of film supplied and the circumferential movement values of the coiled tube and they are taken into account by the computer for

  carry out a suitable control of the movement of the carriage carrying an

  cutting gane and to define the moment of application of the cutting member. A system in accordance with the present invention therefore represents the assurance of obtaining tube sections of exactly dimensions

  identical regardless of the thickness of the film sheet.

  The various objects and characteristics of the invention are-

  will now be detailed in the description which follows, made to

  by way of nonlimiting example, with reference to the appended figures which represent: - FIG. 1, in schematic form, a winding machine

  in spiral equipped with a cutting-off device of: tube and system

order teme,

  - Fig. 2, a diagram drawn up using various values

  their measurement and transferred onto a section of tube wound in a spiral, - FIG. 3, a longitudinal section along the axis III - III of FIG. 4, a first measurement sensor assigned to the circumferential movement of the coiled tube, - FIG. 4, a front view of the measurement sensor according to arrow IV of FIG. 3, - Fig. 5, a schematic longitudinal section of a second measurement sensor, and - FIG. 6, a cross section along the axis VI - VI of

  Fig. 5, of the measurement sensor according to FIG. 5.

  Fig. 1 shows in a very schematic form a winding mandrel 10 and its free end 10a of a winding machine

  spiral, on which the spirally wound tube 13 is rotated

  tion in a known manner by means of a winding belt 11 in the direction of arrow 12 and evolves in the manner of a propeller in its

  longitudinal direction. To form the spirally wound tube 13, more

-4-

  film ribbons are most often fed to the winding core

  Lement 10 at an angle to its longitudinal axis. The figure does

  shows that a film ribbon 14, for example a paper ribbon, forms

  mant the basic ribbon. The film tape drive rollers and the usual gluing system are not shown. The film tape 14 passes over a measuring roller 15 which

  is rotated in the direction of arrow 16 under the effect of the

film tape 14.

  The tube cutting device 17 of the tube winding machine consists of a carriage 18 which supports a knife

  circular 19 can be adjusted perpendicular to the longitu-

  end of the spirally wound pipe 13 which can move alternately

  tively on a spindle 21 or on a guide slide in the direction of the double arrow 20. The drive unit 22 of the carriage 18

is symbolized by a shoemaker.

  The control system, which ensures the longitudinal movement

  nal of the carriage 18 and the implementation of the circular knife 19 per-

  making it possible to obtain sections of tube of predetermined length, has a first pulse generator 23 which is connected to the shaft

  24 of the measuring roller 15 moved by the film tape 14 and which

  delivers synchronization pulses to a computer 25 in operation

  tion of the rotation of the measuring roller 15. A second generator

  of pulses 26 provided in the control system delivers to the computer

  25 of pulses corresponding to the rotational movement of the tube

  wound 13 in its circumferential direction. The design of this se-

  cond pulse generator 26 will be described later with reference to

  Refer to Figs. 3 and 4. The connection of the two pulse generators

  23 and 26 with the computer 25 is represented by a dashed line

  te 27. The control links c8té output from the computer 25 with the drive unit 22 of the carriage and with the carriage 18 proper supporting circular knife 19 are represented by lines

dashed line 28.

  The computer 25 is provided with a keyboard 29 allowing entry

  constant data such as the inside diameter D of the tube in

  rolled 13. In FIG. 2 are shown, in addition to the quantities indicated

  -5- quées, vector arrows corresponding to the speed of passage

  of the tape VB determined by the measuring roller 15, the circumferential speed

  ferential VU determined by the measurement sensor 26 and the speed VR resulting from these two values and representative of the longitudinal displacement of the tube 13, this speed being determined by the computer

  25 from the data entered.

  Figs. 3 and 4 show an embodiment of the cap-

  measuring tor 26 which is located at the end 10a of the chuck

  bearing 10. At this point, the hollow winding mandrel is provided with a front plate 30 transverse to the axis of the mandrel, which is provided with a central opening in which is engaged a housing for

  bearing 31 of the measurement sensor 26. An outer flange 32 of the housing

  bearing 31 lies in abutment against the front plate 30 and is removably mounted on the latter by means of screws 33. Inside the bearing housing are provided two ball bearings 34 and 35 on a shaft 36. At the inner end of the shaft 36 is fixed the

  rotor of an electric pulse generator 37. At the op-

  posed from the shaft 36 is fixed a mounting plate 38 whose outer edge forms, with the outer zone of the flange 32 of the bearing housing 31, a kind of labyrinth seal 39. A removable rotating wing with two arms 40 is fixed by means of screws 41 on the plate 38. In recesses 42 made at the two ends of the rotating wing 40 are housed added elements 44 terminated by a spout 43 which are subjected to the tension of a pressure spring 45. The beaks

  43 of the inserts 44 are easily inserted into the inner wall

  of the tube formed on the winding mandrel 10 and pushed by

  the latter in a helical movement and provide a drive

  ment without sliding of the rotary wing 40 without however preventing a longitudinal extraction of the tube. The chamfer 46 of the spouts 43 has the role of preventing the spouts 43 from tearing the interior wall

  of the tube during the longitudinal extraction of the coiled tube 13.

  Figs. 5 and 6 show a second measurement sensor responsible for determining the circumferential movement of the coiled tube. This second

  measurement sensor consists of a Hall 47 generator which is im-

  planted outside the coiled tube 13 and shown in dis-

2568 1 7 6

-6-

  continuous in FIG. 5 and which cooperates with a ring of permanent magnets

  nents 48 which rotates inside the coiled tube 13 with the latter.

  According to FIG. 6, the permanent magnets 48 are placed at

  exactly equal tervalles on a flange tube 49 so as not to touch the inner wall of the coiled tube 13. The flange tube 49 is fixed on the central part 50 of a support secured to a shaft 51, two pressure jaws 52 and 53 being arranged in said support. According to FIG. 6, the two pressure jaws 52 and 53 are mounted on guide bolts 54 secured to the central part and are subjected to the tension of pressure springs by which they are pressed against the inner face of the wound tube 13. Due to the friction thus obtained with the wound tube 13, the support associated with the flange tube 49 is driven by the wound tube 13. The shaft is housed freely rotatable in a bearing 56 of the winding head 57 of a winding machine. The pressure of the jaws 52 and 53 generated by the springs 55 and the configuration of the jaws are chosen so that the coiled tube 13 can pass

  over the brake shoes 52 and 53 in the longitudinal direction.

  In the Hall generator, the rotating permanent magnets

  48 produce output pulses which are transmitted to the computer

  signal in the form of correction signals.

2568 1 76

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Claims (7)

  1. System mounted on a machine to wind the tubes of   film operating continuously, in particular on a winding machine   ler in a spiral, and intended to control a cutting member and a cha-   riot supporting said cutting member and being able to move forward and backward in the direction of advance of the coiled tube, the speed of said carriage during the cutting process being equal to the speed of advance of the tube,   this system comprising a computer which, in addition to fixed values   treats pulses which are delivered by an electric pulse generator associated with a measuring roller placed on the film sheet leading to the winding spindle, characterized in   there is also a measurement sensor (26) e.ié à.l'ordina-   tor (25) pmr determine the rotational movement (V) of the coiled tube   (13) in its circumferential direction.   2. System according to claim 1, characterized in that   that the additional measurement sensor (26) comprises a pal-   fear (40) applied against the inner face of the tube.   3. System according to claims 1 and 2, characterized   in that the feeler member of the additional measurement sensor (26) has the form of a rotating wing (40) mounted at the end   (10a) of the winding mandrel (10) and comprises at least one end   elastic support tee (inserts 44).   4. System according to claim 3, characterized in that the rotary wing (40) is connected by means of a shaft   (36) to a pulse generator (37) protected inside the man- winding line (10).   5. System according to claim 3 or 4, characterized in that the external fulcrum (34) of the rotary wing (40) is covered in the direction of the periphery of the winding mandrel   and, in the axial direction, in the direction of the rotating wing (40).   6. System according to claim 1, characterized in that   that the measurement sensor is a Hall generator (47) which is im-   planted outside the rolled-up tube (13) and which is stressed by at least a permanent magnet (48) placed inside the rolled-up tube   (13), said magnet rotating with the tube (13).   7. System according to claim 6, characterized in that there is provided a ring of permanent magnets (48) which is placed at a small distance from the inner face of the wound tube (13) on a support (50, 52 , 53) applied elastically against the face inside the tube.