EP0143319A1 - Electromechanical winding device with connection to the terminals - Google Patents

Abstract

The device for winding and for connecting the wire at the start and at the end of the winding comprises: A cross table propelled along the axes X and Y by stepping motors. A winding-mandrel support complete with main motor and mounted on the cross table. A vertically movable tool-holder driven along the axis Z facing the mandrels, by a stepping motor. A control device powering the various motors so as to obtain, on the one hand, the winding of a core and, on the other hand, by rotating a wire-guide of the mandrel about a bar for connecting the core, the connecting of the wire, which occurs at the start and at the end of the winding. <IMAGE>

Description

In general, the device of this invention advantageously applies to all types of winding with metallic threads, textile fibers, synthetic fibers, where the fixing of the thread is necessary, at the beginning, during and at the end of the winding; this fixing is done at the ends which can be vertical or horizontal on the winding support.

This system makes it possible to center the fixing point whatever its geometric translation on the winding support. Very short times and maximum quality can be obtained with the chuck blocked and thanks to the movement X, Y, Z which, taking place outside the winding, places the point very close to the chuck to control the spiral fixing of the wire; this is obtained by synchronizing the movement of the three axes around the wire, with a circular or elliptical circuit or with the description of a square.

The system, after having fixed the wire, returns to the maximum centering position and performs the winding with rotation of the mandrels around the winding support.

The method generally used at present consists in carrying out with the mandrel positive and negative angles, the axis of the mandrel being fixedly centered on the winding, to put the wire around the appropriate hook using external mechanical means.

However, these hooks being normally placed in various geometrical positions and at variable distances, this results in a certain difficulty of selection with loss of time and an inferior quality for production. The initial fixation being before the winding different from the final fixation and considering that the fixings can in any case be of horizontal or vertical type, this results in a great compli electrical and mechanical cation with change of references and different angles of the mandrel; all this makes development laborious and in many cases absolutely impossible.

This invention, on the contrary, makes it very easy to center the mandrel and the wire with the anchor point beyond the winding position. When the three axes of the system have been checked, the positioning on the fixing bar is considerably simplified and, in addition, the two working points being brought together, maximum performance is obtained without risking interference with other points of fixing, this also provides a speed more than 40% higher than that achieved with traditional devices.

The characteristics and advantages of the invention will appear more clearly in the following description given by way of example but not limiting and with the help of the appended drawings.

Figure 1 is an overview of the device.

Figures 2a and 2b illustrate the table with crossed movements of axes X - Y.

Figure 3 illustrates the Z-axis tool holder.

Figures 4a, 4b, 4c illustrate the head and the mandrels.

Figures 5, 6, 7, 7a illustrate examples of fixing in a horizontal position with a fixing rod.

Figures 8, 9, 10, 10a illustrate examples of fixing in a vertical position on a fixing rod.

The device illustrated comprises a basic main support 1, a transverse carriage 2 movable along the Y axis, driven by the stepping motor 3, a longitudinal carriage 4 movable along the X axis, with an orthogonal movement in relation to carriage 2 and driven by the motor step-by-step 5, a vertical carriage 6 movable along the Z axis with perpendicular movement relative to the carriage 4, driven by the stepping motor 7. Above the carriage 4 is mounted the winding head 8 carrying one or more winding mandrels 9 according to the production requirements. The mandrels 9 are generally called stirrups when they rotate around the winding support 10 carrying the wire which passes through the central hole of the main shaft and leaves the front part of the arm on small tubes or wire guides. The rotational power is supplied by the main motor 11. The mother screw 56 of the longitudinal carriage 4 X is set in motion by the stepping motor 22. The worms 21 - 19 are adjusted to remove the play with the lead screw dependent on the longitudinal carriage 4 X 55. The carriage 4 moves on slides 4 - 3, the adjustment 45 eliminates the play of these slides by giving the whole system maximum rigidity and very smooth sliding.

• 1. il transmet la rotation aux arbres des mandrins à l'aide de la courroie dentée 32 et de la poulie dentée 61,
• 2. il porte le frein d'arrêt 45. Ce frein a comme fonction de bloquer les arbres des mandrins en phase de fixation aux extrémités, pour ne pas perdre les références nécessaires.

The winding head and the fixing 1 are mounted on the carriage 55. The main motor 49 flanged on this head moves in the axis X - Y during the winding phase and that of fixing, being an integral part of this head. This motor with favorable speed and coupling ratios, feeds the return shaft 58 by means of the pulleys and the belt 31. This return shaft has two functions.

• 1. it transmits the rotation to the shafts of the mandrels using the toothed belt 32 and the toothed pulley 61,
• 2. it carries the stop brake 45. This brake has the function of blocking the shafts of the mandrels in the fixing phase at the ends, so as not to lose the necessary references.

The toothed belt 32 therefore feeds the shafts of the mandrels.

The toothed belt 32 travels an obligatory path from the tensioning rollers 80 - 65 surrounding practically a part of the circumference of the toothed pulley 14 up to each mandrel. The latter 25 are mounted on high speed bearings 5 to guarantee a high winding speed. The encoder disc 18 suitably read with an electronic circuit mounted on the fixing of the cathode 28, not only sends the necessary signals to the control microprocessor, but it functions as an electronic synchronizer between the main motor and the stepping motor of the carriage screw 4 for the necessary winding pitch. In addition, this disc must indicate the exact stop position of the mandrels in the desired position and fixed in advance, guaranteed by the stop brake 45. The disc 15 on the mandrel shaft with the appropriate reading probe mounted on the support bracket 16 functions as additional security by checking the exact stop position of the kinematics, together with the function of the encoder disc 18. The path of the wires which, starting from the deposit placed behind the system, reach the supports to be rolled up and anchored, is fully explained in a chapter below. The main base 62 acts as a support for the entire X - Y device. The carriage 2 moves on the slides 5-6 controlled by the adjustment screws 45 to cancel the play and obtain maximum rigidity. The lead screw 20 with its endless screws 17-18 for adjusting and recovering the clearance placed on bearings, is set in motion by the stepping motor 22 which, by turning, displaces the whole carriage transversely in both directions and consequently also the carriage 4 and the mandrel-carrying head for centering the coils to be wound during the winding phase and for centering the anchor point during the initial, final or final fixing phase winding. To guarantee the rigidity of the system at high winding speed, while the carriage 4 and the mandrel head has the winding in layers, the cylinder 67 blocks the carriage 2 by means of the dowel 65.

This blocking is released during the search phase of the anchor point and during the whole fixing of the wire on the end concerned. Then, when the whole system is centered automatically to start the next winding, this blocking is reactivated.

The axial carriage 30 movable along the axis Z with vertical travel is actuated by the stepping motor 31. This carriage supports the coils on which the operation of winding the wire and fixing at the ends is carried out.

To automate production, it is possible to mount various carriages 30 with movement and vertical travel on a rotary table 32; the electromagnetic friction group 33 is used to disconnect the control of these carriages 30 in the rotation phase of the table 32. The carriage 30 moves on hardened steel bars 34 using ball bearings 35. The screw on the bearings 36 actuate the carriage 30 coupled with it by means of endless screw 37 with return of the axial play by the compression spring 38. The holes represented on the carriage 30 are used to accommodate the reel carriers carrying the cores to be wound and to which it must fix the ends of the wire.

Figures 5, 6, 7 show the sequence of movements X, Y, Z for fixing the wire on a rod or horizontal bar with an axis parallel to the axis of the winding mandrel.

FIG. 5 represents the maximum centering position of the axis of the mandrel on the axis of the take-up reel. The wire as seen, passes through the center of the mandrel and, through forced passages, it leaves the thread guide anterior tube. In this phase, the mandrel rotates around the spool holder, winding the wire and putting it in layers, due to the movement along the X axis in the winding zone.

In Figure 6 after the end of the winding is shown the next phase of positioning of the axes for the start of the fixing of the wire on the end. Along the X axis, the mandrel completes a stroke T up outside the winding zone and is positioned along the length of the fixing bar. Along the axis Y, the mandrel completes a lateral stroke S relative to the axis of the coil, perfectly centering the axis of the fixing bar. We have now obtained a partial centering of the axis of the mandrel with the fixing bar.

Figure 7 illustrates the approach phase between the wire guide sleeve of the mandrel and the fixing bar. The approach course U along the vertical Z axis, controlled by the machine's microprocessor by means of the stepping motor, allows exact control of the behavior and positions of the wire. From this position, the entire device is positioned to fix the wire on the bar.

• Les croquis illustrés du système doivent être considérés comme vus depuis le centre du mandrin. Symboles : O = douille guide-fil du mandrin.
• • = barre de fixation.
  
  

As an example, the sequence of movements necessary to obtain a fixing turn on the bar in the horizontal position is given below:

• Illustrated system sketches should be viewed as seen from the center of the chuck. Symbols: O = thread guide sleeve of the mandrel.
• • = fixing bar.
  
  

These sequences of alternating movements between the Z axis which makes the tool holder move and the Y axis which makes the whole head move, are executed at high frequencies for the number of rotations depending on the turns of the wire which must be obtained on the fixing bar. Note again that the system allows spiral attachment. This is done simply by inserting a movement in the direction of the X axis of the head at the end of each turn before executing the next. As illustrated in FIG. 7a E represents the movement along the X axis between each turn.

At the end of the fixing phase, the whole system is returned to the zero position on the X, Y, Z axes to return to the winding position.

Figures 8, 9, 10 show the sequence of movements X, Y, Z for a vertical type attachment with orthogonal axis to the winding mandrel.

Figure 8 shows the maximum centering position of the axis of the mandrel with the axis of the winding reel. As can be seen, the wire passes through the center of the mandrel and, through a compulsory path, it leaves the anterior tube. In this phase, the mandrel rotates around the spool holder by winding the wire and placing it in layers according to the movement of the X axis in the winding zone.

FIG. 9 illustrates the fixing of the wire at the end of a winding.

Along the X axis, the mandrel completes a stroke T outside the winding zone by positioning itself beyond the fixing bar. Along the Y axis, the mandrel completes a lateral stroke S with respect to the axis of the coil, placing itself at the desired distance on the side of the fixing bar.

We have now obtained a partial positioning for fixing the wire between the bar and the mandrel.

Figure 10 shows the approach phase between the wire guide sleeve of the mandrel and the fixing bar. The approach course U along the Z axis in the vertical direction, controlled by the microprocessor of the machine by means of the stepping motor, makes it possible to exactly control the behavior and the positions of the wire. From this position, the entire device is positioned to fix the wire on the fixing bar.

Below, we will find a very schematic representation of the sequence of movements which, in this case and for this kind of fixing, are executed with the axes Y - Z.

Example of the sequence of movements to obtain a fixing turn on the bar in the vertical position.

• Symboles : O = douille guide-fil du mandrin
• • = barre de fixation.
  

The illustrated sketches of the system should be considered as seen on a horizontal plane.

• Symbols: O = mandrel thread guide sleeve
• • = fixing bar.
  

From this position, the movement of the system starts again from point 2. These sequences of alternating movements between the X axis and the Y axis which cause the entire chuck head to move, are executed at high frequencies for a number of rotations depending on the fixing turns that we want to obtain. It should also be noted that the system allows spiral attachment, also with a vertical bar.

This is done simply by inserting a movement towards the Z axis of the tool holder at the end of each turn, before executing the next. This is illustrated in FIG. 10a where E represents the displacement along the Z axis at the desired distance between each fixed turn.

At the end of the fixing phase, the whole system is returned to the zero position on the X, Y, Z axes to return to the winding position.

Claims (5)

1. Electromechanical machine for winding and fixing the ends of the wire, characterized in that it comprises a table with crossed movements along the orthogonal axes X and Y formed by two carriages each driven by a motor; an assembly carried by this table comprising at least one winding mandrel and its drive device; a slide movable along the Z axis orthogonal to the X and Y axes, located opposite the mandrels, driven in vertical displacements by a stepping motor; and at least one reel holder mounted on this slide. 2. Machine according to claim 1, characterized in that it comprises a device for controlling the stepping motors positioning, before and / or after each winding operation, a bar for fixing a coil fixed on the reel holder approximately opposite a thread guide of the mandrel to allow the wire to be wound on this bar by relative displacements of the mandrel and the reel holder. 3. Machine according to one of the preceding claims, characterized in that all the mandrels are driven simultaneously in rotation and in their axial translation. 4. Machine according to claims 2 and 3, characterized in that during the fixing of the wire on a fixing bar secured to the coil, the mandrel is further driven in an axial movement back and forth along the axis X . 5. Machine according to claims 2, 3 and 4, characterized in that during the fixing of the wire on a fixing bar secured to the coil, the slide, movable along the Z axis, performs a back-and-forth movement come.

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