CH656597A5 - ELECTROMECHANICAL COILING AND FIXING MACHINE FOR THE END OF A WIRE. - Google Patents

Description

The subject of this invention is an electromechanical machine for winding and fixing the ends of a wire which can advantageously be applied to all types of winding with metallic son, textile fibers, synthetic fibers, where the fixing of the wire is necessary, at the start , 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.

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 electrical and mechanical complication with change of the references and different angles of the mandrel; all this makes development laborious and in many cases absolutely impossible.

The machine according to the invention is defined by claim 1. It 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 machine have been checked, 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 attachment points, which also allows a speed more than 40% higher than that achieved with traditional devices.

The machine according to the invention 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 mandrel to control the spiral fixing of the wire; this is obtained by synchronizing the movement of the three axes around the wire,

with circular or elliptical circuit or with the description of a square.

The machine, 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 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 X-Y axes.

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 schematically in Figure 1 comprises a main base 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 a movement orthogonal to the carriage 2 and driven by the stepping motor 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 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.

Figures 2 to 4 illustrate the machine in more detail.

The lead screw 12 of the longitudinal carriage 4 X is set in motion by the stepping motor 5. The endless screws 13-14 are adjusted to remove the play with the lead screw 12 depending on the longitudinal carriage 4 X. The carriage 4 moves on slides 15-16, an adjusting screw 17 eliminates the play of these slides by giving the whole system maximum rigidity and very smooth sliding.

The winding head 8 and the support 8a are mounted on the carriage 4. The main motor 11 (fig. 4a) flanged on this head moves along the XY axes during the winding and fixing phase, being an integral part of this head. This motor 11, with favorable speed and coupling ratios, supplies the idler shaft 18 by means of pulleys 19 and the belt 20. This idler shaft has two functions:

1. it transmits the rotation to the shafts 9a of the mandrels 9 using the toothed belt 21 and the toothed pulley 22;

2. it carries the stop brake F. This brake has the function of blocking the shafts 9a of the mandrels 9 in the fixing phase at the ends, so as not to lose the necessary references.

The toothed belt 21 therefore drives the shafts 9a of the mandrels 9.

The toothed belt 21 travels an obligatory path from the tensioning cylinders 23-24 surrounding practically a part of the circumference of the toothed pulley 25 to each mandrel. The latter 9 are mounted on high speed bearings 26 to guarantee a high winding speed. The encoder disc 27, suitably read with an electronic circuit mounted on the attachment 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 11 and the stepping motor 5 of the screw 12 of the carriage 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 F. The disc 29 on the shaft 9a of the mandrel with the appropriate reading probe mounted on the support bracket 30 works as a

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656,597

Symbols:

io y

+

4-

i- *

Uh

O = Mandrel thread guide sleeve. • = Fixing bar.

1 - Starting position.

2 - Position obtained by moving the whole head on the Y axis in the direction indicated.

3 - Position obtained by moving the tool holder along the Z axis in the direction indicated.

Position obtained as under 2, but in opposite direction.

30

-O—

35

Position obtained as under 3, but in opposite direction.

additional curiosity by checking the exact stop position of the kinematics, together with the function of the encoder disc 27. The path of the wires which, starting from the deposit placed behind the system, reach the supports to be wound and anchored is fully explained in a chapter later. The main base 1 acts as a support for the entire device formed by the carriages 2 and 4. The carriage 2 moves on the slides 31-3la controlled by the adjusting screws 32 to cancel the play and obtain maximum rigidity. The mother screw 33, with its endless screws 34-35 for adjusting and recovering the clearance placed on the bearings, is set in motion by the stepping motor 3 which, by rotating, displaces the whole carriage transversely in both directions and consequently also the carriage 4 and the mandrel holder head 8 for centering the coils to be wound during the winding phase and for centering the anchor point during the initial, final or intermediate fixing phase of the winding. To guarantee the rigidity of the system at high winding speed, while the carriage 4 and the chuck head 8 has the winding in layers, the cylinder 36 blocks the carriage 2 by means of the pin 37.

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 6 movable along the Z axis with vertical travel is actuated by the stepping motor 7. This carriage supports the coils on which the wire winding and fixing operations are carried out.

To automate production, it is possible to mount various trolleys 6 with movement and vertical travel on a rotary table R; the electromagnetic friction group 38 is used to disconnect the control of these carriages 6 in the rotation phase of the table R. The carriage 6 moves on hardened steel bars 39 using ball bearings 40. The screw 41 on the bearings actuate the carriage 6 coupled with it by means of endless screw 42 with recovery of the axial play by the compression spring 43. The holes represented on the carriage 6 serve to house the reel carriers 10 carrying the cores to be wound and to which the ends of the wire must be fixed.

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 can be seen, passes through the center of the mandrel and, through forced passages, leaves the anterior wire guide tube. In this phase, the mandrel rotates around the spool holder, winding the wire and putting it in layers, thanks to the movement along the X axis in the winding zone.

In Figure 6, after the end of the winding is shown the following phase of positioning the axes for the start of the fixing of the wire on the end. Along the X axis, the mandrel completes a stroke T as far as outside the winding zone and is positioned along the length of the fixing bar. Along the Y axis, 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 microprocessor of the machine by means of the stepping motor, makes it possible to precisely control the behavior and the positions of the wire. From this position, the entire device is positioned to fix the wire on the bar. As an example, the sequence of movements necessary to obtain a fixing turn on the bar in the horizontal position is given below.

The sketches of the device must be considered as seen from the center of the mandrel.

in this position, the movement of the system starts again from 2.

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 required. get on the fixing bar. It should also be noted that the device 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 following. As illustrated in FIG. 7a, E represents the movement along the axis X between each turn.

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

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

FIG. 8 represents the maximum centering position of the axis of the mandrel with the axis of the take-up reel. As can be seen, the wire passes through the center of the mandrel and, through a compulsory path, 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.

65 Figure 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 by

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~ r

656,597

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relative to the axis of the spool, 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 gui-de-fil bushing of the mandrel and the fixing bar. The approach stroke U along the vertical axis Z, controlled by the microprocessor of the machine by means of the stepping motor, makes it possible to precisely 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 fixation, 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.

The sketches of the device must be considered as seen on a horizontal plane.

Symbols:

4-

4-

Symbols:

O = Mandrel thread guide sleeve. • = Fixing bar.

-L

Starting position.

25

1

-f x

Position obtained by moving the head support along the X axis in the direction indicated.

35

O = Mandrel thread guide sleeve. • = Fixing bar.

Position obtained by moving the support along the Y axis in the direction indicated.

4 - Position obtained as under 2, but in opposite direction.

5 - Position obtained as under 3, but in opposite direction.

From this position, the movement of the device 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 following. 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 device is returned to the zero position on the axes X, Y, Z to return to the winding position.

10 sheets of drawings

Claims (5)

656,597 1. Electromechanical machine for winding and fixing the ends of a wire, characterized in that it comprises a table with crossed movements along the orthogonal X and Y axes 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 spool 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 holder coils approximately opposite a wire guide of the mandrel to allow the wire to be wound on this bar by relative displacements of the mandrel and the reel holder. 2 3. Machine according to one of the preceding claims, characterized in that it comprises several mandrels driven simultaneously in rotation and in their axial translation. 4. Machine according to one of claims 2 or 3, characterized in that, during the fixing of the wire on a fixing bar integral with the coil, the mandrel is further driven in an axial movement back and forth along the X axis. 5. Machine according to claim 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.