CH644329A5 - DEVICE FOR PERFORMING SEPARATION OF THE TERMINAL PARTS OF CONDUCTIVE WIRES IN AN AUTOMATIC WINDING MACHINE. - Google Patents

Description

The subject of the present invention is a device for effecting the separation of the end parts of the fine conductor wires wound on an electrical component such as a high frequency coil, a pulse transformer, etc., having terminal pins, allowing d 'wind the end parts of the conductor wires around the end pins of the winding and automatically cut the ends of the wire after winding.

Such a device is intended to be used in an automatic winding machine. A known device of this kind comprises a rotary winding rod for winding the end parts of a conducting wire on a terminal pin, this rod being arranged so as to be able to approach and move away from the terminal pin and having, at its front end, a housing for receiving the terminal pin and a sleeve assembled in a sliding manner with the winding rod and having, on its outer peripheral surface, two appendages allowing the hanging of the conductive wire.

An electrical component constituting a characteristic example of the type of component having a coil, the winding of which can be produced by means of such an apparatus comprises a number of terminal pins fixed in a base plate provided with a coil on which a electrical conductor wire must be wound, the two end parts of the wire wound on the coil can be respectively fixedly connected to two different terminal pins, so as to constitute a winding. When an end part of the winding must be wrapped around its end pin, the winding rod is brought closer to the end pin so as to cause the latter to be inserted into the housing provided in the rod , the two appendages of the sleeve, mentioned above, retaining the conductive wire.

In this position, the rotation of the winding rod and the ~ 5 sleeve causes the conductive wire to wind around the root part of the spindle; during the sliding of the sleeve towards the spindle, a certain length of wire between the wire retaining appendages and a wire supply source, such as a wire coil, wraps around the sleeve because presence of appendages. After formation of a given number of turns of the conductive wire around the base of the spindle, the sleeve arrives at the limit of its displacement because it is pulled by the wire during winding. At this time, the tension applied to the conductive wire drawn between the sleeve and the base of the spindle becomes greater than the tensile strength of the wire. This causes the drawn wire to break, the sleeve retaining the remaining part of the wire from the wire supply source. The winding rod is then moved, with a view to winding the next winding, in an appropriate position, while the sleeve retains the front part of the wire coming from the wire reel.

In such a device, it is necessary to use two winding rods in a winding operation during which two kinds of wire, having different diameters, are wound around the same spool, because of the fact that the sleeve of the winding rod always retains the front part of the wire coming from the wire spool, after separation of the end parts of the conducting wire on a winding, a winding rod being able to effect the separation of only one wire . In addition, this known device 5H cannot be used to carry out a winding operation during which a double winding of two wires is carried out on the same coil, by connecting the two end portions of the wires which protrude from the coil after winding with two respective terminal pins so as to form a so-called two-wire bearing.

When a winding operation is carried out by means of such a device, a few loops of thread remain wound around the sleeve of the winding rod, the quantity of thread thus remaining progressively increasing during the advancement of the 'winding opera-6o tion. Many pieces of wire are thus lost and, in addition, it is necessary to interrupt the winding operation in order to remove the lost pieces of wire from the sleeve. This decreases the efficiency of the winding operation.

The invention therefore aims to provide a device for fi5 effecting the separation of the end portions of fine conductive son, in which a plurality of son can be wound on a reel successively or simultaneously, reducing the amount of lost wire and allowing a high yield of

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the winding operation thanks to the automatic removal of the lost thread portions.

To this end, the device according to the invention has the characteristics specified in claim 1.

The invention will be better understood thanks to the detailed description which follows, given by way of example, with reference to the appended drawing in which:

fig. 1 is a side view showing the essential organs of an automatic winding machine, provided with the device according to the invention, in accordance with a particular embodiment thereof;

fig. 2 is a partial perspective view of a gripping assembly forming part of this device;

fig. 3 is a partial perspective view of a wire gripping member in its position corresponding to the release of the wire;

fig. 4 to 12 are schematic views illustrating the successive stages of the winding operation carried out by means of the device according to the invention, FIG. 4 being a side view showing the position in which a gripping assembly hooks an electric wire held by a claw, FIG. 5 being a side view showing the guiding of the wire around a winding reel by the gripping assembly, FIG. 6a being a side view showing the guide, by the gripping assembly, of the end part of the wire in a groove forming part of the base of the winding, FIG. 6b being a perspective view illustrating the same step as FIG. 6a, fig. 7 being a side view of the device in the position in which it is when it is ready to carry out the winding of the end part of the wire on a terminal spindle of the winding, FIG. 8 being a side view illustrating the operation of winding the end part of the wire on this pin, FIG. 9 being a side view showing the recessed position of the device during the winding of the wire on the spool, FIG. 10 being a side view showing the attachment of the tensioned wire between the coil and the retaining claw, after the winding of the wire on the coil, FIG. 11 being a side view showing the guide, by the device, of the end part of the wire, cut by the knife of the claw, towards another terminal pin, and FIG. 12 being a side view showing the position of the device when it is ready to carry out the winding of the terminal part of the wire on this other terminal pin;

fig. 13 is a partial perspective view showing the front part of a winding rod according to another embodiment of the device according to the invention, and FIG. 14 is a schematic view showing the arrangement of two wires during a two-wire type winding operation.

As seen in fig. 1, an automatic winding machine 1 is provided with a device 2, according to the present invention, which makes it possible to separate the end parts of a fine wire, this device being movable in all directions by means of a control mechanism (not shown). On the left side (as shown in fig. 1) of the device 2 are a rotating mandrel 3 for holding a coil 4, a claw 5 for retaining and cutting a fine wire 6, and a guide plate 7 in which is provided a guide hole 7a for guiding the wire 6 supplied by a wire spool (not shown). These three members 3, 5 and 7 are arranged at suitable intervals in the vertical direction.

The device 2 comprises a movable frame 8, which can move from left to right, and vice versa (as shown in fig. 1), as well as in the perpendicular directions, thanks to the control mechanism, a winding rod 9, which can be rotated by a drive motor (not shown) and being able to slide in a sleeve 10, from left to right and from right to left, a set 11 for gripping the wire 6 and a set 12 for operating plates controlling the gripping assembly 11 and movable by means of a pneumatic cylinder (not shown) in the same direction as the winding rod 9.

The winding rod 9 passes through the sleeve 10, the end of which comes to rest on a stop 13 making it possible to push the rod 9. A coil spring 14 is placed around the right part of the rod 9

pushing it to the right. The left end of the rod 9 is tapered in a truncated cone so as to form a pin-receiving part 15 whose anterior end (on the left) is smooth and rounded. A coaxial housing 16 is formed in the pin receiving part 15 in order to allow the insertion of a terminal pin p of the winding 4 carried by the mandrel 3.

The sleeve 10 is carried, so as to be able to rotate, by two bearings b fixed in the movable frame 8, and is rotated by a motor (not shown). In addition, the axial movement of the sleeve 10 from left to right and from right to left is prevented by two stop rings r disposed on both sides of the frame 8. A connecting block 17, fixed to the left end of the sleeve 10 , supports the gripping assembly 11 which rotates, with the sleeve 10, around the winding rod 9.

A circular hole 17a is formed in the connection block 17 to house, in a fixed manner, the right part of a fixed sleeve 18 in which slides a movable sleeve 19. At the right end of the sleeve 19 is fixed a flange retaining 1 for retaining the right end of a coil spring 21 of low force which is mounted around the sleeve 19 and pushes it to the right. As seen in fig. 2, a gripping disk 22 is fixed to the left end of the sleeve 19, the diameter of this disk being equal to the outside diameter of the fixed sleeve 18. A gripping rod 23 slides, without rotating, through the sleeve 19 and the disc 22. This gripping rod is provided with a retaining flange 23a, fixed at its right end, and a coil spring 25a, relatively strong, is mounted between the flanges 20 and 23a and pushes the rod 23 towards the right relative to the sleeve 19. At the left end of the rod 23 is fixed a gripping cylinder 24 whose axis is perpendicular to that of the rod 23 so as to form therewith an assembly in the form of T. The wire 6 can be retained between the flat surface 22a of the disc 22 and the opposite cylindrical outer surface 24a of the cylinder 24, on the right side or on the left side of the latter relative to the rod 23, under the effect of the force exerted by the powerful coil spring 25a.

The flange 23a of the rod 23 is placed opposite a support plate 25 of the actuating mechanism 12, this plate being fixed to the ends of two slides 26 sliding, in parallel, from left to right and from right to left, through two guide holes 27 made in the chassis 8. The right ends of the slides 26 are fixed to a connecting plate 28 which comprises, in its central part, an opening allowing the free passage of the winding rod 9 and the coil spring 14 of the catch to the right and vice versa.

The elastic force exerted by the spring 25 disposed around the rod 23 is much greater than that exerted by the spring 21 placed around the sleeve 19, and the resistance of the wire 6 to the traction corresponds to a value greater than the force of the spring. 21.

As seen in fig. 3, the claw 5 comprises a central rod 29 at the front end of which is fixed a circular retaining plate 29a, a retaining sleeve 30, slidably fixed around the rod 29 and arranged so as to allow the maintenance of the wire 6 between its front end surface 30a and the internal surface of the plate 29a, and a cutting sleeve 31 slidably fixed around the retaining sleeve 30. A cutting edge 31a is formed at the front end of the sleeve cutting 31 in order to cut the wire 6 held by the sleeve 30 and the plate 29a.

The coil 4 supported by the mandrel 3 comprises a coil 4a on which the wire is wound 6. The coil 4a is fixed, at one of its ends, to a base plate 4b in which are fixed, by coating their ends in the mass of this plate, a plurality of terminal pins p. An end plate 4c, formed at the other end of the coil 4a, is held by the mandrel 3.

The base plate 4b has, at the periphery of its outer surface, a number of guide grooves g making it possible to guide a part 6a of conductive wire when the end part of

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this is wrapped around the root part of a terminal pin, as shown in fig. 6b.

The apparatus which has just been described operates in the following manner.

As seen in fig. 1, the lower end of the wire 6 is held by a claw 5, the cutting sleeve 31 of which is in the retracted position relative to the anterior end of this claw, while the winding 4 during winding is held by the mandrel 3. When these members are in this configuration, the device 2 is moved in the direction of the wire 6, by means of the control mechanism, so that the gripping assembly 11 can catch the wire, the plate 25 pushing the collar 23a of the rod 23 to the left so as to cause the simultaneous displacement of the sleeve 21 and the rod 23 in the same direction.

At this time, as seen in fig. 4, the coil spring 21, mounted on the movable sleeve 19, is first compressed so as to allow the displacement to the left of the sleeve 19, until the flange 20 abuts against the end surface of the connecting block 17, without changing the state of the high-power coil spring 25a. As soon as the flange 20 presses against it, the high-power coil spring 25a begins to be compressed, which causes the gripping cylinder 24 to separate from the gripping disc 22 so as to create a space for the wire reception 6.

When the gripping assembly 11 is placed in a position allowing the reception of the wire 6 in the space created, in the manner just described, between the cylinder 24 and the disc 22, the assembly of maneuvering plates 12 is retracted into its previous position, so that the rod 23 is moved to the right, under the effect of the repulsive force exerted by the coil spring 25a, firmly holding the wire 6. At the same time as the assembly gripping 11 hooks the wire 6, the retaining sleeve 30 of the claw 5 retracts relative to the plate 29a, which releases the lower end of the wire 6. After which the claw 5 is retracted into a position in which it does not interfere with the supply of wire 6 during the winding operation, as shown in fig. 5.

After the attachment of the wire 6 in the gripping assembly 11, the device 1 is rotated around the winding 4, by means of the control mechanism, so as to cause the attachment of the wire 6 to the coil 4a, and the 'part 6a of the conductive wire is pulled upwards, by means of the gripping assembly which is placed above the winding 4.

Then, as shown in fig. 6, the gripping assembly 11 is moved downward and obliquely so as to pass the part 6a of the conductive wire inside and along one of the grooves g, as well as along one of the pins p around the base of which the end part of the wire 6 must be wound. After which the device 2 is moved to a position in which the receiving quality 16 of the winding rod 9 can receive the rod p, the front part 6a of the wire being wound on the foot of the spindle p and pulled by the assembly gripping 11 under the effect of the relatively weak repulsive force exerted by the coil spring 21. The pusher 13 then pushes the winding rod 9 to the left with an amplitude such that the space allowing the winding of the wire on the foot of the spindle p is held between the anterior end of the receiving part 15 for the spindle and the base plate 4b of the winding 4. Thus, the device 2 is ready to allow the winding of the conductive wire on the foot of pin p, as shown in fig. 7.

When the machine and the device are in this state, it is rotated, as shown in fig. 8, the winding rod and the sleeve 10 in the same direction and, consequently, the gripping assembly 11 rotates around the winding rod 9 and the gripping assembly hooks the end of the conductive wire 6a. The rotation of the gripping assembly 11 turns the conductive wire 6a around the base of the pin p, the conductive wire 6a sliding on the smooth surface of the anterior end of the pin receiving part. Since the pin receiving part 15 rotates in the same direction as the gripping assembly 11, the conductive wire 6a being wound on the foot of the pin p does not catch on the front part of the rod 9. The speed of rotation of the winding rod 9 can be equal to that of the sleeve 10 or the gripping assembly 11, but the winding rod 9 can also be rotated faster than the assembly of gripping 11. In this case, the supply of conductive wires 6a towards the foot of the pin p is done more regularly.

As the winding of the conductive wire 6a advances around the base of the spindle, the length of the conductive wire 6a between this part of the spindle and the front end of the grip assembly 11 decreases, which causes traction of the assembly 11 in the direction of the winding 4 as well as the compression of the coil spring 21, on the sleeve 19, by the retention flange of this sleeve. However, as the elastic force exerted by the coil spring 25a on the rod 23 is high, the disc 22 and the cylinder 24 do not separate from each other.

When the sleeve 19 moves in the direction of the winding 4 with sufficient amplitude for the retention flange 20 to abut against the lateral surface of the connection block 17, the conducting wire 6a is subjected to a maximum tensile force and, at the end in a short time, the conducting wire 6a is automatically cut at a point on this wire close to the foot of the spindle p. The number of turns of wire wound on the root of the spindle is determined by the length between the retention flange 20 and the connection block 17, in the configuration of the device shown in FIG. 1, as well as by the elastic force of the coil spring 21.

After cutting the conductive wire 6a, the device 2 retracts to its previous position, as shown in FIG. 9, and the pusher 13 is moved to the right in order to move the winding rod 9 in the same direction under the effect of the repulsive force exerted by the coil spring 14. During the retraction movement of the device 2, the plate 25 pushes the winding rod to the left, causing the separation of the cylinder 24 from the disc 22, and thereby freeing the section of wire 6b held between them.

In order to facilitate the release of the lost wire section 6b, an air jet can be directed against the front part of the gripping assembly 11, by means of a nozzle (not shown) disposed above the winding 4.

The mandrel 3, which maintains the coil 4, is then rotated so as to cause a given number of turns to be wound on the coil 4b. After winding this predetermined number of turns, the movement of the mandrel 3 is stopped and the clamp 5 is advanced, from its retracted position, so as to hold the wire 6 again, as shown in FIG. 10. Then begins the operation of separating another end portion of the wire 6.

As shown in fig. 10, the device 2 is moved, by means of the control mechanism, in the direction of the wire 6, so as to hook the part 6c of the conductive wire which is stretched between the winding 4 and the claw 5. At the same time as the assembly gripping 11 hooks the part 6c of the conductive wire, the cutting sleeve 31 is moved towards the anterior end of the claw 5, so as to cut the part 6c of the wire by means of the cutting edge 31a. The device 2 is then placed in a position similar to that which is shown in FIG. 6, so as to place the part 6c of the conducting wire on another terminal pin p with the part 6c of the conducting wire placed inside and along a groove g, as shown in FIG. 11. After which, as shown in fig. 12, the winding rod 9 is advanced, so as to introduce the other pin p into the housing 16, and the winding pin 9 and the gripping assembly 11 are rotated. After winding a number predetermined number of turns around the base of the new terminal pin p, the part 6c of the conducting wire is automatically cut in the same manner as that illustrated in FIG. 8.

After cutting the part 6c of the conductive wire, the device 2 is retracted into the position indicated in fig. 9, and a section of lost thread is released. Thus, a complete cycle of winding operations was carried out.

As mentioned above, the device 2 comprises a set 5

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gripper ble 11 capable of firmly holding the wire in any position and of releasing it easily, this gripping assembly being arranged so as to be able to rotate around the winding rod 9. This makes it possible to wind the wire 6 on the spool 4a, in any direction, which makes it possible to use the device 2 to carry out the winding operation during which two different wires are successively wound around the same spool during a so-called two-wire winding operation. More specifically, as shown in fig. 14, in the case of a winding operation carried out in the manner described above, one io first winds around the winding 4, by means of the device 2, one of the two wires 6 held in parallel by respective claws . After cutting the end part of this wire 6, the other wire 6 is wound up and its end part is cut. In the case of the two-wire type winding, the two wires 6 are wound simultaneously around the winding 4, then one of the two end parts is first wound on one of the terminal pins p, finally, separately, the other end part on the other pin p.

This latter procedure is made possible by the fact that the gripping assembly 11 is in a configuration 20 allowing the attachment of another wire, without retaining the previous wire, at the end of a winding operation. performed with one of the two sons. In the case of the known device described above, the winding rod corresponding to the winding rod 9 of the device according to the invention always retains the wire around it at the end of a cycle of winding operations . Consequently, this device of known type cannot carry out the two winding operations of the two-wire winding.

In addition, when using the device according to the invention, the length of lost wire is very small and, since it is easy to separate a section of lost wire from the gripping assembly 11, it is possible to '' Carry out successive winding cycles without stopping the movement of the different parts of the device 2.

Fig. 13 illustrates another embodiment of the pin receiving part 30 of the winding rod 9. This receiving part 30 comprises a vertical flat surface 30a formed by cutting one of its lateral halves along a plane of vertical cutting, in the direction of the length of the pin receiving part 30. The pin p comes into contact laterally with the flat surface 30a and, at the anterior end of the part 30, a guide groove 30b is formed to guide the wire 6 towards the gripping assembly 11. In this case, it is necessary to rotate the gripping assembly 11 at the same speed as the winding rod 9, in order to prevent the wire 6 from catching on at the front end of the part 30, comprising the guide groove 30b.

On the surface 30a, it is possible to make a receiving groove (not shown) parallel to the spindle p, in order to accommodate and position the spindle p.

3 sheets of drawings

Claims (6)

644,329 1. Device for performing the separation of the end portions of the fine conductor wires wound on an electrical component in an automatic winding machine in which this device is movable in all directions by means of a control mechanism and the electrical component is mounted in a rotary manner on a mandrel, characterized in that it comprises a rotary winding rod (9) displaceable towards the component (4), as well as in the opposite direction, the rod (9) being arranged so as to be able to • guide, at its anterior end (15), the conducting wire (6a, 6c) around one of the terminal pins (p) fixed to the component (4), the device also comprising a set (11) for gripping the wire, allowing temporarily retaining the wire, this assembly (11) being arranged so as to be able to rotate around the winding rod (9), in the direction of rotation of the latter, and to be able to be moved towards the component (4), up to a certain distance from the latter, by being pulled by the conducting wire being wound around the foot of the terminal spindle (p) during the rotational movement effected by this assembly (11) around the rotary winding rod (4 ), retaining the end part of the lead wire. 2. Device according to claim 1, characterized in that it comprises a rotating sleeve (10) supported by a movable frame (8), movable in all directions, in which the rod (9) is housed so as to be able slide and turn, the rod (9) having, at its front end, a housing (16) intended to receive the terminal pin (p) when the conductive wire is wound on the foot of the spindle, the assembly (11) of gripping the wire being connected to the rotating sleeve (10) via a connecting member (17), so as to allow this assembly (11) to rotate, with the sleeve (10), around the rod d winding (9). 2 3. Device according to one of claims 1 or 2, characterized in that the speed of rotation of the winding rod (9) is the same as that of the assembly (11) for gripping the wire. 4. Device according to one of claims 1 or 2, characterized in that the speed of rotation of the winding rod (9) is greater than that of the assembly (11) for gripping the wire. 5. Device according to one of claims 1 or 2, characterized in that the assembly (11) for gripping the wire comprises a movable sleeve (19) sliding through a fixed sleeve (18) fixed on the member connection (17), this movable sleeve (19) being pushed by a first spring (21) in the opposite direction to the component (4) and having, at its anterior end, a first gripping member (22), making it possible to hold the conducting wire, and a sliding rod (23) passing through the sleeve (19) and having, at its anterior end, a second gripping member (24), this rod (23) being pushed in the same direction as the sleeve (19) , and relative to it, by a second spring (25a), the conductive wire being retained between the two gripping members (22, 24), the elastic force exerted by the second spring (25a) being greater than that of the first spring (21) as well as the tensile strength of the conducting wire, which is itself greater than the force of the first 1st spring (21). 6. Device according to claim 5, characterized in that the first gripping member (22) and the second gripping member (24) consist respectively of a disc and of a cylinder forming a T-shaped assembly with the sliding rod (23 ) housed without turning in the movable sleeve (19).