FR2474468A1 - COILING HEAD FOR A WINDING MACHINE FOR USE IN WINDING ELONGATED PARTS OR CORES - Google Patents

Abstract

A MAGAZINE WINDING HEAD FOR A WINDING MACHINE, IN PARTICULAR CLOSED CORES, INCLUDES AN ACTUATION AND BRAKING DEVICE. THE HEIGHT AND LENGTH OF THE STORAGE CHAMBER OF MAGAZINE 42 ARE SIGNIFICANTLY GREATER THAN THE DIAMETER OF THE WIRE. DURING WINDING, THE WIRE RESERVE 45 IS FIXED IN THE MAGAZINE WHICH IS EMPTY FROM THE BOTTOM.

Description

Winding head for winding machine usable for

wind elongated parts or cores.

  The invention relates to a winding head having a wire magazine for use in a winding machine, in particular for winding wire or insulating material on an elongated member or tube and on a core. The winding head can be used for winding toric cores, but can also be used for winding

other nuclei.

In existing machines for winding on annular toroidal cores, mainly with a material in the form of a wire, magazine winding heads are used, essentially of the following types: 1) Type of coil wire magazine 2) Type of tubular magazine 3) Two ring type 4) Single ring type) Bandaging machine. In the winding heads with magazine Mbbinéccnnues for example according to the German request published under the number 1 228 719, the wire magazine moves in a circular path around the organ to be wound and at the same time turns around its own axis. This arrangement has the following disadvantages: the material must, during a prior operation, be wound up in the magazine to be wound up in the reserve and the capacity of the magazine is limited on the one hand with respect to the dimensions of the path

circular, on the other hand vis-à-vis the member to be wound.

In the case of winding of annular cores, whether open or closed, the magazine and therefore the carrying capacity are limited by the size of the opening in the core

annular, which is also a drawback.

  In machines with a tubular magazine, such as those disclosed for example in patent EUA Re 17,559, a tube formed in a circular ring is used, the material to be wound being wound helically in the tube, During the winding operation, turn the ring in its own plane, around its own center and around the organ to be wound. The disadvantage of this arrangement is that it is necessary, during a prior operation and using a special machine, to wind the material of

winding and push it into the tube.

  A head with two rings such as that of British Patent No. 660 218 consists of a advancement ring and a magazine ring. The two rings have almost the same diameter and a common axis of rotation. The disadvantage of this arrangement is that it is first necessary for the two rings to perform a rotational movement, locked one on the other, when the material is placed in the store ring, after which removes the blocking, the direction of rotation is reversed and the winding can take place

analogously to the two methods mentioned above.

  The fact that the cross section of the two ring type is increased compared to the tubular magazine type due to the presence of the advancement ring implies a

increase in the minimum size of the hole of the cores canceled

both open and closed.

In machines of the ring type, for example according to EUA patent No. 3,662,965, a ring is used

  closed U-shaped section with side slide.

The disadvantage of this type is that it is first necessary to rotate the ring a certain number of times to place the material to be wound, after which the direction of rotation is reversed and the winding can be carried out, at using the side slide, similar to the case of the two-ring type machine. In the case of annular cores, both open and closed, the winding plane is offset from the center of the hole, which implies increased consumption of wire. In addition the minimum dimension of the hole increases with the thickness of the

side slide.

  The bandaging machine is used to cover

  a finished winding of a ribbon-shaped insulating sheet.

Such a machine comprises for example a magazine comprising two identical rings between which are placed close cylindrical rollers. An attempt has been made to use this principle for winding wire (machine according to the German application disclosed under the number no. 2 427 588). This principle, when used for wire, has two main drawbacks: on the one hand the residual hole in the annular core will be significant because only the extreme part of the

  rollers provided with only one side supports the reserve of wire.

  On the other hand, since each of the rollers provided with flanks rolls during the winding process there is a significant friction between the reserve of thread and the flank and the thread breaks if more than one layer of thread is introduced. in

the shop.

In addition, the different types of stores described below

  above have in common that, during the winding operation,

  the thread tension is established using a friction brake.

This type of brake can only have the effect of increasing the nominal wire tension without making it possible to modify the range

thread tension.

  The object of the present invention is to provide a winding head operating according to a new principle, and provided in particular, but not only, for the winding of annular cores, eliminating the drawbacks of known methods of winding. We seek in particular to reduce the winding time and to simplify handling at a point allowing control by robot. The present invention therefore provides a winding head with a wire magazine usable in a machine for winding wire or insulating material on elongated members or on cores, in particular on closed cores such as annular cores, said head comprising actuation means and optionally braking, the winding head being characterized in that the section of the storage chamber of the wire magazine has a height and a width significantly greater than the diameter of the wire, in that during the winding process the wire reserve is fixed in the store and in that the store is

  designed to be emptied from the bottom.

  This makes it possible to start winding on a core at the same time as filling the magazine, because the material to be wound, preferably enameled copper wire, descends directly into the magazine and leaves it from the bottom in any place to come into contact with the component to be wound. When the magazine is rotated, there is simultaneously winding on the support and filling of the magazine. When the magazine is sufficiently filled, the wire is cut and the quantity of wire stored in the magazine is wound on the support without the need to change the direction of

  rotation or even to stop the store.

If the store is emptied from the bottom facing any fixed point under the. bottom of the magazine, on a thread advancing means, separate from the magazine and situated on a common axis of rotation with that of the magazine so that the magazine and the thread advancing means rotate freely one by one

  relative to each other but in the same direction of rotation before-

firmly established, there can be a well-defined fixed point from where the wire leaves the bottom of the store. The store will be fine

suitable, even for large diameter wires.

  Because the magazine is designed to empty from the bottom through a flexible slot, we have the smallest residual hole possible in the case of winding of annular cores because the filled winding head does not occupy a much larger space than the amount of yarn that has been wound in it. As a result, a much smaller residual hole is obtained than

which can be obtained with known winding machines.

  If the magazine and the wire advancement means each consist of two substantially annular members placed concentrically on the same axis of rotation, a winding head of small dimensions is obtained, which makes it possible to obtain a small remaining hole in a

annular nucleus.

It is also possible to obtain a small residual hole in another embodiment characterized in that the magazine has a larger diameter than that of the wire advancing means and surrounds said means, in that the section of the magazine has substantially the shape with an O or a U where the thread is gathered, in that the magazine has a flexible central slot through which the thread can be pulled, and in that the magazine and the means for advancing the thread are supported

  by individual sets of bearings.

  According to another embodiment, characterized in that the barrel has a larger diameter than that of the wire advance means and surrounds said means, in that the section of the barrel essentially has the shape of an O or of a U o the wire is collected and in that a part of the bottom of the barrel is constituted by bearings mounted on the wire advance means and serving to reduce the friction between the concentric annular means and forming, at the same time, the any fixed point on which the barrel will be emptied, we obtain a reduction in friction which allows

  work at higher winding speeds.

If the magazine and the wire transfer means form an open ring, it is possible to wind closed annular cores or other similar cores without having to

open the winding head.

  You can get a working winding machine

very safe and easily adjustable using a winding head in which the landing between store and medium

  wire feed includes one or more roll paths

  ball bearings or includes sliding bearings or

  ball bearings mounted on the feed means.

  In yet another embodiment, the magazine is braked by a separate braking device which acts only on the magazine, which makes it possible to obtain a thread tension.

constant during the winding process.

  In particularly advantageous embodiments of the flexible slot, this slot can either be formed in the bottom of the store by an elastic material, or formed by two annular parts, at least one of which is fixed elastically and concentrically to the ring of the

wire store.

  A realization, very simple from the mechanical point of view, of the flexible slot is obtained if the symmetrical rings of the magazine are suspended between elastic bearings so as to be pushed against each other by elastic forces.

  We can expect very high winding speeds.

  of fine wire with a flexible slit head, forming the slit by an area of overpressure air constituting an air cushion which supports part of the wire reserve, this air overpressure being established using means

  forming a nozzle during the rotation of the magazine.

The invention will be explained below in detail in

  referring to the accompanying drawings in the-

  which: Figure 1 shows a winding head according to the invention with flexible slot;

  Figure 2 is a sectional view of the winding head

  leuse according to Figure 1 Figure 3 shows a winding head according to the invention with magazine and open wire feed means Figure 4 is a section through the bearings of the winding head shown in Figure 3; Figure 5 shows an embodiment with open rings; Figure 6 shows an embodiment with two sets of bearings; Figure 7 shows in detail the flexible slot embodiment according to Figure 6; and Figure 8 shows an embodiment of the

structure of the store according to Figures 6 and 7.

Figure 1 shows a winding head which includes a wire magazine 42 supported by guide rollers 60

  and rotated by motor means 61 by means of

  diary of a belt 51. The wire-like material 45 is brought from a reserve of wire 46 to the magazine 42 through guide means 47 using the belt 51. From there, the wire is led through the bottom of the barrel, provided with a flexible slot 62 (FIG. 2), to come into contact with the core 49 to be wound. The free end of the wire 45 is held against the core 49 and wraps around the core when the magazine 42 is rotated. In order for the turns to be placed correctly on the core, the latter and the winding head must move mutually during the winding operation. This can be ensured in a conventional manner at

  using retaining means 50 carrying the core 49.

  In Figure 2 we see that the magazine consists of two symmetrical rings 42 fixed to one another by the guide rollers 40. The flexible slot 62 is formed between

two rubber lips 65.

We see in Figure 1 that the store 42 is composed of two sectors with assembly faces 57 which allows to open the endless ring of the store to set up

closed ring nuclei.

  FIG. 3 shows a winding head made up of a wire advance means II and a wire magazine 12, the means and the magazine being able to rotate freely with respect to each other by means of bearings 13. The rotation of the wire advancing means It is obtained by means of particular drive members 14 in the form of toothed wheels or friction wheels engaged with the advancing means 11. The wire 15 is moved by a reserve of thread 16 placed outside the winding head by guide means 17 to the magazine 12 from which it is guided to the core 19 to be wound, from the bottom of the magazine passing through a fixed point 18 on the advance means 11. The free end of the wire is held against the core 19 and, when the advance means 11 and thereby even the fixed point 18 are rotated, the wire 15 is wound around of the core and simultaneously the magazine 12 is filled with wire. To properly position the turns on the core 19, it is necessary that this core and the winding head move mutually during the winding operation. This can be obtained in a conventional manner by means of holding means 20 for the core 19. We see in FIG. 3 a braking device 21 comprising a belt 21 which surrounds the magazine 12 on a part of its periphery and comes in taken with it. FIG. 3 shows four identical bearings 13 between the advance means 11 and the magazine 12, FIG. 4 showing the detail of one of these bearings 13. In this embodiment, the advance means is divided into two rings 22 placed symmetrically. The bearing comprises two ball bearings 23 each placed in a ring or cage 22 and connected to each other by a common shaft 24 which holds the two rings together. The magazine comprises two symmetrical rings 25 placed between the two rings 22 of the advance means and positioned with respect to them using a roller 26 on the shaft 24. The two rings 25 of the magazine can roll on the roller 26, which allows the magazine 12 to rotate relative to the feed means 11 about the common axis of rotation. One of the rollers 26 can form the fixed point 18 on the feed means 11, point by

  which wire 15 is pulled from the bottom of magazine 12.

  It can be seen in FIGS. 3 and 4 that the magazine 12 and the wire advance means 11 are divided into sectors with assembly faces 27 so that the magazine 12 and the transfer means 11 in closed rings can be opened for set up closed annular cores. The wire 15 is extracted from the bottom of the barrel over the roller 26 forming

said fixed point 18.

FIG. 5 shows an embodiment where the wire advance means 11 and the magazine 12 are open rings which can be placed directly on closed cores. FIG. 6 shows an embodiment where the magazine 12 surrounds the wire feed means 11. The magazine is then supported by separate bearings 30 carried by brackets mounted on the winding machine and the feed means consists of a one piece ring, but interrupted,

free from the store.

FIG. 7 shows in detail the bearings 30 and 31, the magazine 12 provided with rubber lips 32 and the means

in advance 11 of the embodiment according to FIG. 6.

Figure 8 shows another embodiment of the store according to Figures 6 and 7. This figure shows a concrete example of a store with a circular section such that the residual hole in a wound annular core is of the same order of magnitude as the section from the whole

barrel-transfer ring.

A winding operation can be described using a winding head according to the known invention comprising the following steps: a) the wire is brought from the reserve reel and it is passed through the bottom of the magazine for the 'bring it into contact with the nucleus and maintain it on this nucleus; b) we start to rotate the store. For each turn placed on the core, we extract a corresponding length of wire from the magazine through its bottom, so that the extraction point moves a length of turn (or an equivalent offset occurs between the magazine and the guide ring). At the same time, the barrel performs a movement corresponding to once its own circumference plus a length of turn, so that a corresponding length of wire is stored in the magazine c) the wire is cut when the magazine has stored a

  Sufficient wire reserve for the winding to be performed.

  The winding operation is then continued until

the barrel is empty.

  The winding head according to the invention can be used to wind wire or insulating material on an organ

  elongated of any type, whether curved or straight.

  In particular, it makes it possible to wind cores for electrical coils and transformers and other articles,

  such as closed toroidal nuclei.

Claims (15)

1. Magazine wire winding head (12, 42), for a machine for winding wire winding on elongated members or cores, in particular closed cores, such as annular cores, said head comprising an actuating device and possibly braking, characterized in that the section of the storage compartment of the wire magazine (12, 42) has a height and a width significantly greater than the diameter of the wire, in that during the winding process the reserve of wire is fixed in the store (12, 42) and in that the store (12, 42) is designed to be emptied from the bottom.   2. Winding head according to claim 1, characterized in that the barrel (12) is emptied by the bottom facing any fixed point (18) under the bottom of the barrel, on a wire advance means (11), which is separated from the barrel (12) and arranged on an axis of rotation common with that of the   barrel so that the barrel (12) and the means of trans-   thread (11) rotate freely with respect to each other but in the same previously chosen direction of rotation. 3. Winding head according to claim 1, characterized in that the wire magazine (42) is constructed to empty from the bottom through a flexible slot (62).   4. Winding head according to claim 2, characterized in that the magazine (12) and the wire advance means (11) each consist of two substantially annular members (22, 25), placed concentrically on the same rotation axis. 5. Winding head according to claim 4, characterized in that the wire magazine (12) has a larger diameter than that of the wire advancing means (11) and surrounds the latter, in that the barrel section has substantially the shape of an O or a U where the wire is gathered, in that the magazine has a flexible central slot (32) through which the wire (15) can be pulled, and in that the magazine ( 12) and the wire feed means (11) 1l   are supported by sets of bearings (30, 31). 6. winding head according to claim 4, characterized in that the magazine (12) has a larger diameter than that of the wire advancing means (11) and surrounds the latter, in that the section of the barrel (12) has substantially the shape of a 0 or a U where the wire is gathered, in that a part of the bottom of the barrel is constituted by bearings (12, 24, 26) mounted on the advance means of wire and used to reduce friction between the concentric annular means (22, 25) and forming, at the same time, any fixed point (18) by which the barrel empties. 7. Winding head according to any one of the res- dications 1 to 6, characterized in that the magazine (12) and the thread advancing means (11) both form an open ring. 8. winding head according to claim 5, characterized in that the bearing (13, Figure 8) between magazine (12) and wire advance means (11) comprises one or several ball bearings.   9. Winding head according to claim 6, characterized in that the bearing (13, Figure 8) comprises plain bearings or ball bearings (23) mounted on the wire advance means (11).   10. Winding head according to any one of claims 2, 4, 5 and 6, characterized in that the   medium to wire (12) is braked by a braking device (21) acting only on the store. 11. Winding head according to all the claims   tions 3 and 5, characterized in that the flexible slot (62) in the bottom of the magazine is made of a material elastic (32, 63).   12. Winding head according to claim 3, characterized in that the bottom of the magazine consists of two annular parts (63) at least one of which is fixed elastically and concentrically to the ring of the store (42) associated therewith. 13. Winding head according to claim 3, characterized in that two symmetrical rings (42) of the magazine are suspended between elastic bearings so as to be pushed against each other by elastic forces. 14. Winding head according to claim 3, characterized in that the flexible slot is formed by an area of overpressure air forming an air cushion which supports part of the wire reserve.   15. Winding head according to claim 14, characterized in that the air overpressure is established using means forming a nozzle during the rotation of the magazine.