FR2495998A1 - DEVICE OF A TUBE TAPE ROLLER MACHINE FOR CONTROLLING A CUTTING EQUIPMENT - Google Patents

Abstract

THE DEVICE CONTROLS A TROLLEY 20 SUPPORTING A CUTTING EQUIPMENT AND CAN BE ANIMATED BY A BACK AND BACK MOVEMENT FOLLOWING THE DIRECTION OF ADVANCE OF THE TUBE TO BE FORMED 10. IT IS CHARACTERIZED IN THAT IT INCLUDES A SIGNAL GENERATOR 14 TORQUE TO A CANE ROLLER 11 TURNING THANKS TO THE ADVANCE OF THE TUBE, AND MEANS 22 CONNECTED TO THE GENERATOR AND CONTAINING A COUNTER 17, 18 EXCITING THE CUTTING EQUIPMENT AND RECEIVING THE GENERATED SIGNAL, TO CONTROL THE MOVEMENT OF THE TROLLEY 20 IN DEPENDENCE OF THE GENERATED SIGNAL.

Description

DEVICE OF A TAPE TAPE MACHINE FOR CONTROLLING

CUTTING EQUIPMENT.

  The present invention relates to a device of a machine for winding a strip of tubing working continuously, of the machine type.

  spiral winder, to control a carriage supporting a balance

  cutting element which can be moved back and forth in the direction of advance of the tube to be formed. Devices of the above type are already known. A particular problem has been exposed for example in DE-A-2 428 219 concerning the synchronous control of the carriage supporting the equipment

  cutting with the displacement of the tube. It has also already been proposed

  ment, with reference to DE-C-2 724 899 and DE-C-875 914, to determine the length of the tube section by measuring the length of the strip or

ribbon to be rolled up.

  The object of the invention is to simplify a device for

  such a request without reducing its safety in this regard.

  To this end, a device of the type defined in the entry

  in material is characterized in that it comprises means of generating

  signal ration coupled to a grooved roller rotating thanks to the advan-

  that of the winding tube applied to the roller, and means connected to the generation means and containing counting means

  exciting the cutting equipment and receiving the generated signal, for control

  der the movement of the carriage in dependence on the signal generated.

  In the device according to the invention, the advance of the tube during winding is taken into account, and according to this advance are controlled both the movement followed by the carriage carrying the cutting equipment that the introduction of the cutting element of this equipment. It was not easily conceivable to establish control from the longitudinal displacement of the tube during winding due to the fact that the tube performs not only a translation but also a rotation, which can affect an exact measurement of the displacement longitudinal of the tube. So it appeared that a roller

  with smooth surface was not conceivable to capture the long displacement

  gitudinal of the tube during winding resting on the roller and simultaneously performing a rotation. Firstly thanks to a -2channel which is above all a groove parallel to the axis of the roller, the longitudinal displacement is determined exactly and thus no sliding of the roller takes place by the rotation of the tube in progress

winding.

  As signal generation means can be provided a pulse generator which is connected to a counter and which is coupled to the roller sensing the movement of the tube. The number

  of pulses delivered penret to determine the length of the tube pass-

  sant on the roller and to control the introduction of the cutting member of the cutting equipment for the detachment of a section of tube to the desired length, by comparing said number of pulses with a predetermined nominal value . Depending on the frequency of the pulses supplied by the generator, the adjustment of the carriage displacement can be synchronized with the advance of the tube, the pulses being able to be analyzed either directly in digital form or through their conversion into an analog signal for the carriage drive. The signal generation means can however use a conventional tachometer generator, from the output signal from which can be obtained own pulses

  to determine the length, via an analog-to-Nur converter

  risk. Other advantages of the present invention will appear more

  clearly on reading the following description of three modes of

  embodiment according to the invention, with reference to the accompanying drawings cor-

  respondents, in which: - Fig. 1 is a block diagram of a control device with the signal generator seen in perspective; Fig. 2 is a block diagram similar to that of FIG. 1, relating to a second embodiment of the control device; and - Fig. 3 is a block diagram similar to that of FIG. 1,

  relating to a third embodiment of the control device.

  Fig. 1 shows a tube with spiral windings which rests on a roller 11 provided with a groove 12 parallel to its axis. The tree

  13 of the roller 11 is also connected in the known manner to a general

  pulse sensor 14. Axial displacement of the winding tube

  creates a rotation of the roller 11 and this rotational movement de-

  triggers the generation of pulses by the generator 14, which

  pulses are delivered on an output link 15 of the general

  tor and, through an intermediate link 16 connected to link 15 to a preceptor 17. The precounter 17 is connected to an intermediate logic step 18 which, after the pulse count has reached a predetermined chosen value corresponding to a length of selected movement of the tube 10, issues a triggering order for a cutting member - not shown - which is arranged on the carriage

  - shown schematically in the drawings - of the cutting equipment.

  Through a second intermediate link 21 connected to the 1st output link 15, the pulses supplied by the generator 15

  are applied to a control stage 22 which produces via two links

  output sounds 23 and 24 of the switching pulses for a motor

  step by step 25, which is intended for driving the carriage 20. The

  dragging is achieved by means of a pinion 7 which is mounted on the shaft 26 of the motor 25 and which meshes with a rack 28 fixed to the carriage 20. The carriage 20 is driven, in a manner not visible in the drawings,

  parallel to the winding tube 10 and also by means of a device

  positive control in a synchronous direction to movement

  longitudinal of the tube 10. In the other direction there is a ma-

  known way a return movement at high speed to a position

  starting tion. The return movement is controlled by the intermediate logic stage 18 through the link 29 serving the regulating stage 22, and the regulating stage 22 performs via a link 30 a change of direction of rotation and a rapid drive in the

stepper motor 25.

  The desired length of the tube section corresponds to a

  determined number of pulses from generator 14. This number of pulses

  sions is entered as a nominal value in the

  order. As soon as the precount counter 17 has reached this number

  of pulses, the cutting member not shown, lying on the chain

  riot 20 is activated by the intermediate logic stage 18 to detach

  the tube section of the tube being wound up 10.

  After this detachment which is carried out thanks to the stepping motor

  step 25 synchronized by the pulses delivered by the generator 14 in accordance with the advance of the tube 10, the stepping motor 25 has its reverse drive direction, and with a number of pulses independent of the generator 14 turns in reverse in a step-by-step procedure - 4 -

  fast to a starting position. Meanwhile, in the precomp-

  tor 17 is already entered again the uninterrupted advance of the tube 10.

  According to the embodiment illustrated in FIG. 2, instead of a stepping motor 25 can be provided for driving the carriage 20 a hydraulic motor 31 which is actuated in synchronism with the movement of the tube 10 by means of a controlled dispensing unit 32

  by the regulation stage 22 '. In this embodiment, a conver-

  digital-analog weaver 33 is connected to the intermediate link 21. To the hydraulic motor 31 is connected a tachometer generator which provides on the control link 30 a real value signal to

  the regulation stage 22 ', which signal is compared to the analog signal

  logic transmitted by the digital-analog converter 33 on the

output link 35.

  In the embodiment shown in FIG. 3, instead of the pulse generator 14 is provided as signal generation means, a tachometer generator 36 which delivers an analog signal on the output link 15. In the intermediate link

  16 connected to link 15 is inserted an analog converter -

  digital 37 which delivers via an output link 38, pulses to the precounter 17 which acts, as already described above, on the intermediate stage 18. Through the intermediate link 21, the analog signal from the tachometer generator 36 is applied directly to an input of the regulating stage 22 'which plays the same role as in the embodiment according to FIG. 2, because also a hydraulic motor 31 is provided for the synchronous drive of the carriage 20. - 5 -

Claims (4)

  1 - Device of a machine for winding a strip of tubular material   continuous valiant, like a spiral winding machine, for   order a carriage (20) supporting cutting equipment and for   vant be animated back and forth in the direction of advance of the tube to be formed (10), characterized in that it comprises signal generation means (14; 36) coupled to a grooved roller (11) rotating by advancing the winding tube (10) applied to the roller, and means (regulation stage 22,22 ') connected to the generation means (14; 36) and containing counting means ( precounter 17 + intermediate stage 18) exciting the cutting equipment and receiving the generated signal, to control   the movement of the carriage (20) in dependence on the signal generated.   2 - Device according to claim 1, characterized in that the roller (11) has a groove (12) parallel to its axis.   3 - Device according to claim 1 or 2, character-   laughed at in that the generation means are a pulse generator   sions (14) which is connected to a counter (17) and whose pulses control a stepping motor (25) for driving the carriage (20).   4 - Device according to claim 3, characterized in that to the pulse generator (14) is connected a digital to analog converter (33) whose analog output signal controls the drive of the carriage (20) in the direction of tube advance (10).