Abstract:
A method for terminating and winding coils of a core of a dynamo electric machine. The coils being formed from at least an electric wire and the core having a longitudinal axis. The coils are wound by relatively moving a wire dispenser with respect to a core with relative motions of translation and rotation; at least a stretch of wire extends from the coil and the stretch of wire is provided with a portion for a termination connection to a termination structure of the core such as a tang. The method avoids waste cut wire in the apparatus. The core is provided with a groove at an end to receive at least a wire in the path of the wire for the termination of the coils. The apparatus comprises a wire deflector positioned adjacent the end of the core, where the groove is located, in order to intercept and align the wire with the groove.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to winding coils of dynamo electric machines. 
         [0002]    In particular the solutions of the invention relate to winding coils and terminating coil wires of dynamo electric machine cores. 
       DESCRIPTION OF THE PRIOR ART 
       [0003]    A wire dispenser normally referred to as “needle” releases at least an electric wire for forming a wound coil having a predetermined number of turns. Before and after the winding operation, the termination wires of the coils are connected to terminal structures which are assembled on the core. These connection operations are normally referred to as “termination” operations. 
         [0004]    Once the terminal structures have been terminated they are connected to the electric supply by means of plugs, or by using further wire connections. 
         [0005]    The termination wires are placed along predetermined trajectories to be in contact and anchored to the terminal structures. The terminal structures can be provided with receiving seats where the termination wires are positioned. Portions of the terminal structures forming the receiving seats can be heated and deformed around the termination wire to form a fused joint, as described in EP419849A1. Typical terminal structures having this type of configuration are tang terminals, as described in EP419849A1. 
         [0006]    The termination requires cutting the wire in excess that extends from the terminal structure. This cutting step is necessary to free the core from the wire of the needle once the winding has been completed; in other words, cutting the wire that extends from the terminal structure results in waste wire, which needs to be collected in the winding apparatus and afterwards recycled. 
         [0007]    In order to precisely position the termination wire with respect to the terminal structure, the wire dispenser is relatively moved with respect to the core to deposit the wire on a predetermined trajectory. This can require changing the orientation of the wire passage of the wire dispenser with respect to the orientation used during winding. 
         [0008]    More particularly, in order to wind the coils, the passage channel where the wire of the dispenser runs is normally positioned perpendicular to the longitudinal axis of the core. The longitudinal axis of the core is commonly central and parallel to the extension of the core slots where the coils are placed during the winding operations. 
         [0009]    The dispenser can be oriented by means of a rotation mechanism which positions the wire passage parallel to the longitudinal axis of the core when the termination wires need to be formed and positioned. 
         [0010]    Winding apparatus and mechanisms for rotating the dispenser between the two orientations are described in EP0982837A1. 
         [0011]    The coils wound on the core can be connected by stretches of wire which are positioned along predetermined paths of the end structures of the core. These connection wire stretches are formed by extracting wire from the dispenser when the dispenser is adjacent an end of the core. The operation is commonly referred to a “intermediate termination”. Normally the ends of the core where the paths are formed is where the structure of the dispenser is not required to extend along the core. 
         [0012]    For some winding and termination schemes the paths of the intermediate termination need to be accomplished on an opposite end of the core; that is on the end of the core which requires the dispenser structure to extend along the core to dispense the necessary wire amount. 
         [0013]    The wire dispenser releases the electric wire to wind the coils by relatively moving with respect to the poles of the core. The relative movement of the dispenser can consist of two reciprocating translations for releasing the wire in the two stretches of the coils which are parallel to the axis of the core, and two combinations consisting of translations of the dispenser and rotations of the core for releasing the wire in the two stretches of the coils that are near to the ends and outside the core. 
         [0014]    As mentioned in the foregoing, the dispenser is provided with an end part where wire exits to reach the core. This end part consists of a tubular member which guides the wire very accurately to position it along the required stretches of the wire. The end part is usually positioned perpendicular to the axis of the core during winding. The wire reaches the end part by first running along a stretch which is parallel to the axis of the core, and then accomplishes a curve of approximately 90° to enter the end part. 
         [0015]    The end part can have very small width because it is required to pass in extremely narrow spacing of the cores (for example inside the slots of the core). Consequently the passage of the wire in the dispenser can be narrow, thereby causing a certain resistance to running of the wire. 
         [0016]    The size of the wire used to wind coils of modern motors can be of large diameter compared to the spacing where the wire is wound (for example with respect to the dimensions of the passage where the wire passes to enter the slots); that is the wire can have a diameter that is the order of 1 mm and more. 
         [0017]    The fact of using wire of this size and the presence of the narrow passages where the wire runs within the dispenser, and also the curves that need to be accomplished by the wire, cause considerable tension in the wire during some of the relative motions accomplished by the dispenser and the core to wind and terminate. 
         [0018]    An excessive tension on the wire causes stretching the wire too much, which worsens the quality of the finished cores. For example, considerable tension during the translation of the dispenser when it moves parallel to the longitudinal axis of the core can arise. Also, there can be a considerable decrease in tension when the translation of the dispenser and the rotation of the core occur to release the wire in the two stretches of the coil that are at the ends of the core. These reductions in tension cause the inconvenience of an excessive release of wire length from the needle. The excess wire that is released becomes deposited irregularly on the core. 
         [0019]    U.S. Pat. No. 4,826,012 describes a wire termination solution for avoiding waste wire in a machine for winding armatures. The connection of the wire ends of the coils occurs on the tangs of a commutator by using moveable tubes, which surround the commutator and extract wire from the flyer. The flyer accomplishes circular trajectories to dispense the wire on the armature. 
       SUMMARY OF THE INVENTION 
       [0020]    An object of the present invention is that of minimizing the length of waste wire that needs to be cut as a result of the termination operations. 
         [0021]    A further object of the present invention is that of reducing the number of cutting operations which are necessary during the termination operations. 
         [0022]    It is also an object of the present invention to improve the capacity of positioning termination wires along predetermined paths which anchor and place the wires in contact with the terminal structures. 
         [0023]    It is also an object of the present invention to accomplish wire paths of the intermediate termination on the opposite end of the core; that is on the end of the core that requires the dispenser to extend along the core for positioning the wire required for accomplishing the termination paths. 
         [0024]    A further object of the invention is to improve the tension applied to the wire during winding and termination. In particular, the invention accomplishes the constancy of the tension occurring on the wire during winding and renders more predetermined the tension on the wire in the termination operations. 
         [0025]    These and other objects of the invention are accomplished with the method, according to independent claim  1  and the apparatus according to independent claims  10  and  13 . 
         [0026]    Further characteristics of the invention are indicated in the dependent claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0027]    The invention will now be illustrated by the description which follows relating to some typical embodiments with reference to the attached drawings. 
           [0028]    In the drawings: 
           [0029]      FIG. 1  is an elevation view of an apparatus for winding and terminating wire according to the invention. 
           [0030]      FIG. 2  is an enlarged view of portion  2  of  FIG. 1  illustrating a device for applying tension to the wire according to the principles of the invention; 
           [0031]      FIG. 2   a  is an enlarged view of a portion of  FIG. 1 , as seen from the direction  2   a  illustrating a path for winding a coil of the core; 
           [0032]      FIG. 3   a  is an enlarged view of the portion  3   a  of  FIG. 1  illustrating a stage of the termination operations according to the invention.  FIG. 3   a  is also a view as seen from directions  3   a - 3   a  of  FIG. 3   b;    
           [0033]      FIG. 3   b  is a view as seen from direction  3   b  of  FIG. 3   a;    
           [0034]      FIG. 4   a  is a view similar to the view of  FIG. 3   a  illustrating a further stage of the termination operations according to the invention; 
           [0035]      FIG. 4   b  is a view as seen from directions  4   b  of  FIG. 4   a;    
           [0036]      FIG. 5   a  is a view similar to the view of  FIG. 3   a  illustrating a stage of the operations according to the invention for terminating a further core to be wound; 
           [0037]      FIG. 5   b  is a view as seen from direction  5   b  of  FIG. 5   a;    
           [0038]      FIG. 5   c  is a view as seen from directions  5   c - 5   c  of  FIG. 5   b;    
           [0039]      FIG. 6   a  is a view similar to the view of  FIG. 5   a  illustrating a successive stage with respect to the stage of  FIG. 5   a  of the termination operations according to the invention; 
           [0040]      FIG. 6   b  is a view as seen from directions  6   b  of  FIG. 6   a;    
           [0041]      FIG. 6   c  is a view as seen from directions  6   c - 6   c  of  FIG. 6   b;    
           [0042]      FIG. 7  is a view similar to the view of  FIG. 6   b  illustrating a successive stage with respect to the stage of  FIG. 6   a  of the termination operations according to the invention; 
           [0043]      FIG. 8  is a view similar to the view of  FIG. 7  illustrating a successive stage with respect to the stage of  FIG. 7  of the termination operations according to the invention; 
           [0044]      FIG. 9  is a view similar to the view of  FIG. 8  illustrating a successive stage with respect to the stage of  FIG. 8  of the termination operations according to the invention; 
           [0045]      FIG. 10  is a view similar to the view of  FIG. 9  illustrating a successive stage with respect to the stage of  FIG. 9  of the termination operations according to the invention; 
           [0046]      FIG. 11   a  is an enlarged view of a portion of the view of  FIG. 1  illustrating a specific stage of the intermediate termination according to the invention; 
           [0047]      FIG. 11   b  is a view as seen from direction  11   b  of  FIG. 11   a:    
           [0048]      FIG. 12   a  is a view similar to the view of  FIG. 11   a , illustrating a successive stage with respect to the stage of  FIG. 11   a  of the operations according to the invention; 
           [0049]      FIG. 12   b  is a view as seen from direction  12   b  of  FIG. 12   a.    
       
    
    
     DETAILED DESCRIPTION 
       [0050]    With reference to  FIG. 1 , a core  20  is shown supported and positioned by a tubular support member  70 . More particularly, core  20  is seated and supported in a groove of member  70 . As a result, the core is centred and positioned with respect to axis  70 ′ of tubular member  70 . Therefore, longitudinal axis  20 ′ of the core coincides with central axis  70 ′, as shown in  FIG. 1 . 
         [0051]    Arms  72  are hinged in  73  like appendixes of member  70 . Portions  72 ′ of arms  72  are provided that press on the external surface of core  20 , as shown in  FIG. 1 , to maintain the core seated in groove  71 . Portions  72 ′ are maintained in contact with the core by the pressing action of pushing members  74 , which push on the end portions of arms  72 , as shown in  FIG. 1 . 
         [0052]    Pushing members  74  are assembled on tubular member  70  to slide thereon in directions that radially depart from axis  70  in order to push on the end portions of arms  72  by means of the force of preloaded springs  75 , as shown in  FIG. 1 . 
         [0053]    By pushing in the opposite directions on the portions  78  of arms  72 , that is against the force of the springs  75 , arms  72  release the pressure action on the core and rotate to move away. This allows the core to be moved in direction Z′ for being extracted from tubular member  70 . 
         [0054]    Member  70  is connected to a ring member  76 , as shown in  FIG. 1 . The connection is accomplished with bolts  78 ′, which press in seats of ring member  76 , as shown in  FIG. 1 . 
         [0055]    Ring member  76  is supported on radial bearings  77  for the rotation around axis  70 ′. The bearings are supported on a portion  93  of a platform  94 . 
         [0056]    Ring member  76  is provided with the toothed portion  79 , which is engaged by toothed belt  80 . Pulley wheel  81 , which is driven by motor  82 , drives toothed belt  80 . Motor  82  is carried by bracket  83  which is supported by platform  94 . Programmed rotations of motor  82  rotate core  20  around axis  20 ′ in direction RO 1  and RO 2  ( FIG. 2   a ) during winding and termination ( FIGS. 11   a - 12   b ). 
         [0057]    A needle  21  is supported by a carrying structure  105  with respect to which a wire W runs during winding and termination. The carrying structure  105  is moved in directions Z and Z′ by a motor system  106  to translate and position needle  21  in directions Z and Z′ during winding and termination. 
         [0058]    By unscrewing bolts  78 ′, member  70  can be disassembled from ring member  76  and substituted with another member  70  that is provided with groove  71  and has different dimensions in order to seat cores of other configurations. 
         [0059]    Platform  94  is moved on guides  94 ′ to translate in directions X and X′ by using a programmable motor (not shown). 
         [0060]    Guides  94 ′ are assembled on a second platform  95 , which is moved on guides  96  towards and away an observer of  FIG. 1 . Second platform  95  accomplishes these movements by means of a programmable motor (not shown) which turns a screw  95 ′. 
         [0061]    The motions of platform  94  in directions X and X′ can be used to position core  20  during the termination operations. Similarly, the motions of second platform  95  in directions Y and Y′ can be used during termination and winding to position core  20 , for example during winding to stratify the wire when winding the coils. 
         [0062]    The motion of the second platform  95  in directions Y and Y′, i.e. towards and away with respect to the observer viewing  FIG. 1 , can be employed for moving the finished core away from the working area of the apparatus, or to position a core to be processed in relation to the working area of the apparatus. During this movement in directions Y and Y′, portions  78  of arms  72  can come in contact with a cam surface, which is appositely profiled to move arms  72  away from the core in order to free the core so that it can be unloaded and substituted with a core to be processed. 
         [0063]    A deflector  85  is assembled on a radial arm  86  in order to extend parallel to axis  20 ′, as shown in  FIG. 1 . Radial arm  86  is assembled on the end of first support member  87  by means of a bolt  86 ′. First support member  87  is assembled in a groove  88 ′ of a second support member  88 . The groove has a diameter extension with respect to axis  70 ′. Consequently, First support member  87  accommodates in a portion of support member  70  of core  20  as shown in  FIG. 1 . 
         [0064]    First support member  87  is provided with an inclined groove  87 ′ where a cursor  89  slides in a guided manner. Cursor  89  is fixed to the end of a shaft  90  by means of a bolt  89 ′. This is possible because shaft  90  is inserted in a bore of second support member  88 ; the bore is in communication with groove  87 ′, as shown in  FIG. 1 . 
         [0065]    By moving shaft  90  in direction Z, cursor  89  moves in inclined groove  87 ′ to push support member  87  in a direction R 2 , as it is allowed by the guiding function of groove  88 ′. 
         [0066]    Therefore, deflector  85  is moved in direction R 2  towards the centre of core  20  and along a radius with respect to axis  20 ′ (see also  FIGS. 11   a - 12   b ). By moving shaft  90  in direction Z′, cursor  89  moves in the inclined groove in an opposite direction to push support member  87  in radial direction R 1 , as it is allowed by the guiding function of groove  88 ′. Therefore, deflector  85  is moved in direction R 1 , i.e. towards the outside of core  20  and along a radius with respect to axis  20 ′. 
         [0067]    Second support member  88  is provided with a tubular part  88 ″, which extends coaxial to axis  20 ′ as shown in  FIG. 1 . Shaft  90  extends coaxially inside tubular part  88 ″ as shown in  FIG. 1 . Tubular part  88 ″ is moved in directions Z and Z′ by a screw sleeve system  91 , which is moved by a programmable motor (not shown). In this manner, deflector  85  is moved according to programmable positions in directions Z and Z′ to be aligned with slots like  120  of an end D of the core  20  ( FIGS. 11   a - 12   b ). 
         [0068]    Shaft  90  is moved in directions Z and Z′ by an actuator (not shown) to position deflector  85  in predetermined positions of directions R 1  and R 2 . 
         [0069]    The solution for applying tension to wire W, indicated also as  100 , is shown more in detail in  FIG. 2 . The wire W is wound around pulley wheel  30  for at least one turn. The idle wheel  31  presses on the wire because it is pushed by actuator  32 , which is set with a predetermined force. 
         [0070]    Pulley wheel  30  is driven by a controlled motor  33 . Motor  33  is able to produce predetermined torques on pulley wheel  30  in two rotation directions RP 1  and RP 2  by following a program. The torques in direction RP 2  are opposite to the direction of the wire running towards needle  21 . These torques are transformed into a tension T 1  on wire W. 
         [0071]    Tension T 1  tends to drag the wire, therefore it creates a tension on wire W when the latter exits the needle, or the tension T 1  is able to draw wire W from the needle when the tension of wire W becomes zero. 
         [0072]    The torques in the rotation direction RP 1  will be in the same direction as the running of the wire towards needle  21 . These torques cause a pushing action T 2  on the wire W. Pushing action T 2  tends to feed the wire W out of the needle, or it reduces the drag existing on wire W. 
         [0073]    Pulley wheel  34  pushes the wire in a direction G due to the predetermined pushing force caused by piston  35 . In this way an additional trajectory is generated for the wire when predetermined lengths of wire W are withdrawn by pulley  30  due to rotation in direction RP 2 . In this situation, the wire upstream of pulley  34  is blocked by brake device  35 ′. To block the wire, the brake device  35  presses on the wire by means of a part  36 , which pushes the wire against a member  37 . Part  36  is moved for pressing on the wire, and therefore to block it when a cam  38 ′, on which a wheel  38  runs, moves in direction G. 
         [0074]    In particular, wheel  38  is integral to part  36 , while the cam is integral to the shaft of piston  35 , which moves pulley wheel  34 . The cam presents a profile, which causes wheel  38  to move as a function of the position of pulley  34  in its movements in directions G and G′. 
         [0075]    Therefore, when pulley  34  moves in direction G to create the additional trajectory, cam  38 ′ moves wheel  38  in direction Z′ to cause the wire to be blocked by part  36 , and thereby causes that no further wire is fed by the wire source which is upstream of the brake device  35 ′. In this way, the length of wire withdrawn by pulley  30  occupies a predetermined additional trajectory, which extends between the brake device  35  and pulley wheel  30 . When there is a decrease in tension during the trajectories accomplished by the needle and consequently excessive release of the wire length, the additional trajectory created by pulley wheel  34  causes a withdrawal of excessive length of wire and is able to stabilize the tension of wire W. 
         [0076]    Winding of a coil around a pole  20 ″ of the core requires that the wire exit accomplishes a trajectory TR with respect to the pole of the core as shown in  FIG. 2   a . The trajectory TR is accomplished for winding a turn of the coil and needs to be repeated as many times as is the number of turns of the coil. 
         [0077]    The trajectory TR consists of a translation TR 1  in direction Z of the needle  21  when moved by motor system  106 . Stretch AR 1  follows and consists of a combination of rotations of the core in direction RO 1 , driven by motor  82 , and translations of the needle in directions Z and Z′. Afterwards translation TR 2  of the needle  21  in direction Z′ occurs driven by system  106 . Lastly stretch AR 2  occurs, consisting of a combination of rotations of core  20  in direction RO 2 , driven by motor  82 , and translations of the needle in directions Z and Z′. 
         [0078]    During a trajectory like TR the tension on the wire increases during translations TR 1  and TR 2 , therefore in the solution  100  for applying tension to the wire W torques are applied to pulley wheel  30  in direction RP 1 , which is in the same direction as the running direction of the wire W towards the needle. The tension is applied as a function of the position of the needle during translations TR 1  and TR 2 . This will produce a pushing action T 2  on the wire, which tends to feed the wire out of the needle, or reduces the tension existing during the translations TR 1  and TR 2 . 
         [0079]    In stretches AR 1  and AR 2  the tension of the wire decreases because movement on the first part of these trajectories can produce an excessive length of wire—see length of wire W 1  that needs to be wound against the shorter part of the pole  20 ″. Consequently, torques will be applied to pulley wheel  30  in direction RP 2 , which is opposite to the direction in which wire is running towards the needle. The tension is applied as a function of the position of the needle during rotation of the core. This will produce a tension T 1  on the wire W, which tends to recover a predetermined length of wire from the needle, or increases the tension existing on the wire along stretches AR 1  and AR 2 . 
         [0080]    A sequence of operations for connecting a final wire W 1  of a wound core to a tang  22  and for accomplishing the initial connection to a tang of a core  20  to be wound are shown starting from  FIG. 3   a.    
         [0081]    During the sequence of operations, movement occurs of wire gripper  26  (see also  FIG. 1 ), needle  21  and core  20  together with tang  22 . Wire gripper  26  is moved in an electronically controlled way to obtain predetermined displacements in directions Z and Z′, X and X′, Y and Y′ using respectively screw/sleeves mechanisms  102 ,  103 , and  104 . 
         [0082]    Each of these screw/sleeve mechanisms is moved by a respective controlled motor (not shown), which follows a program. The core  20  together with the tang  22  are moved by a translating platform  94  in directions X and X′, and by a translating platform  95  in directions Y and Y′ (directions perpendicular to the view of  FIG. 1 , where the direction Y enters into the page of  FIG. 1 , whilst the direction Y′ exits from the page of  FIG. 1 ). Each platform  94  and  95  is moved by a respective controlled motor (not shown) which follows a program. 
         [0083]    During the relative motions of wire gripper  26  and tang  22  with respect to needle  21  there are stages where the lengths of wire are fed from the needle  21  by means of pulley wheel  30  to reduce tension, whilst in other stages lengths of wire will be withdrawn from the needle by pulley wheel  30 . 
         [0084]      FIGS. 3   a  and  3   b  show needle  21  oriented parallel to axis  20 ′ of core  20 , and after needle  21  has been displaced from the dashed line position A to position B (in direction Z) to place a stretch W 1  of wire W in seat  22 ′ of final tang  22  of a wound core. During the inverse movement of the needle from the dashed line position B to position A (see also  FIG. 4   a ), tension T 1  is applied to the pulley wheel  30  to retrieve a predetermined length of wire from the needle, therefore for guaranteeing that outside the needle the wire does not loosen excessively. 
         [0085]    In position B (see  FIG. 3   b ), the needle  21  has been positioned in seat  23 ′ of portion  23  of the wire gripper using the vertical movement in direction Z of the needle and then a movement of portion  23  of the wire gripper  26  in direction Y′. During the movement in direction Z the wire passes through aperture  24 ′. These movements have resulted in the stretch of wire W 2  being under side S 1  of the holding part of the wire gripper  26 , as shown in  FIGS. 3   a  and  3   b . Successively, by using a vertical movement of the needle in direction Z′, the needle can return to position A outside the wire gripper, as shown in  FIG. 4   a.    
         [0086]      FIGS. 4   a  and  4   b  show that part  24  of the wire gripper has been translated in direction Y for grasping the stretch of wire W 3  within seat  23 ′. Furthermore, prior to the situation of  FIGS. 4   a  and  4   b  also cutting blade  25  has been moved in direction Y to cut stretch W 3  to a required length against side S 1 . 
         [0087]    Then, and also shown in  FIGS. 4   a  and  4   b , the wire holding portion  23  can move in direction X to push with its external structure the remaining cut stretch W 2  against base portion  22 ″ of tang  22 . 
         [0088]    The position occupied by stretch W 2  against the base part  22 ″ of the tang  22  is such that the structural part  22 ′″ is clear of the wire and can be the part where the electrode contacts during fusing operations to deform and heat the tang and wire, like has been described in European Patent 419,849. 
         [0089]    Consequently after the operations of  FIGS. 4   a  and  4   b , the core is finished and terminated as regards final tang  22 , and the wire gripper  26  remains holding end W 3  that extends to needle  21  by means of stretch W. The stretch of wire extending beyond the wire gripper  26  on the opposite side with respect to needle  21  has been cut by blade  25  at a predetermined distance from side S 1  of the wire gripper without producing wire waste. 
         [0090]    In  FIGS. 5   a ,  5   b  and  5   c , the wire gripper  26  holds the stretch of wire W 4  which extends to needle  21  in preparation for connection to the initial tang  22  of a core to be wound and has moved in direction X to bring the holding portion in position C near to the entrance on one side of seat  22 ′ of initial tang  22 . 
         [0091]    In the sequences of  FIGS. 6   a ,  6   b  and  6   c , which follow those of  FIGS. 5   a ,  5   b  and  5   c , the needle has moved in the vertical direction Z to position a portion of stretch W 4  in seat  22 ′ of initial tang  22 . The wire enters seat  22 ′ through the entrance of seat  22 ′ on side of position C where the wire gripper  26  is positioned (see in particular  FIGS. 6   b  and  6   c ). When the needle translates in direction Z as mentioned, pulley wheel  30  applies a tension T 1  to withdraw a certain length of wire, which goes and occupies the additional trajectory created by pulley wheel  34  and wire brake device  35 . 
         [0092]    In  FIG. 7 , wire gripper  26  and core  20  have been moved with respect to needle  21  with movements in direction X that are synchronized for starting to wind a portion of stretch W 4  around tang  22 , as shown. To accomplish these movements, platform  94  has been moved in direction X for a movement that is synchronized with the motion of the screw/sleeve mechanism  103  which moves the wire gripper  26  in direction X. 
         [0093]    In  FIG. 8 , the wire gripper  26  and the core  20  have been moved with respect to needle  21  in direction Y′ with further synchronized movements to continue to wind a further portion of stretch W 4  around tang  22 , as shown. To accomplish these movements, platform  95  has been moved in direction Y′ for a movement that is synchronized with the motion of the screw/sleeve mechanism  104 , which moves the wire gripper  26  in direction Y′. 
         [0094]    In  FIG. 9 , the wire gripper  26  and the core  20  have been moved with respect to needle  21  in directions X′ and Y′ with further synchronized movements to complete winding a portion of the stretch W 4  around tang  22 , as shown. 
         [0095]    In  FIG. 10 , wire gripper  26  has moved in direction Y′ and during this movement has released the hold on the final portion W 3  in front of base  22 ″ of tang  22  to push and therefore direct W 3  in front of base  22 ″ of tang  22 . Furthermore, in  FIG. 10  the final portion W 3  has come out of the holding portion of gripper  26 . 
         [0096]    Still with reference to  FIG. 10 , the needle  21  has been oriented back to a perpendicular position according to the orientation for winding. At this point the needle  21  can start winding a coil that will have an initial wire anchored to tang  22  like is shown in  FIG. 10 . 
         [0097]    The synchronized movements accomplished by wire gripper  26  and tang  22  in the stages of  FIGS. 5   a - 10  have occurred by means of synchronized translations that are parallel to a plane perpendicular to axis  20 ′ of core  20 , and wire W has been fed in a direction that is perpendicular with respect to the plane in order to reach the exit of needle  21 . The synchronized movements of the wire gripper  26  and of tang  22  occur for predetermined displacements of a controller program to guarantee positioning of stretch W 4  with respect to tang  22  with extreme accuracy and with limited room. 
         [0098]    During the synchronized movements of the wire gripper  26  and tang  22 , the pulley wheel  30  undergoes application of predetermined torques in directions RP 1  and RP 2  which are synchronized with the movements of the wire gripper  26  and the tang  22 . 
         [0099]    The sequence of operations illustrated with reference to  FIGS. 3   a - 10  have achieved the connection of final wire to a tang of a wound core and the connection of an initial wire to the tang of a core to be wound. These operations have occurred without producing stretches of waste wire and also by positioning the end of wire W 3  adjacent to base  22 ″ of tang  22  and along a definite termination path. Furthermore additional cutting has not been required after the cutting performed at the required measurement to terminate the wound core as shown in  FIGS. 3   a - 4   b.    
         [0100]    With reference to  FIGS. 11   a - 11   b , the needle  21  ha finished winding pole  20 ″ and wire W needs to be positioned in groove  120  of core  20 . Groove  120  extends for a circular stretch around axis  20 ′ adjacent to the end of core  20 . Normally wire W is disposed in a portion of groove which leads to a pole where a coil needs to be wound. As shown in  FIGS. 1 ,  11   a  and  12   a , the end of core D where the groove is positioned is opposite to end where the needle initially reaches the core before crossing it to wind the coils. 
         [0101]    In the situation of  FIGS. 11   a  and  11   b , the needle  21  is stationary with the wire extending from a finished coil. Deflector  85  is in a radial internal position ready to move in direction R 1  and in direction Z′ to occupy a predetermined position with respect to groove  120 . 
         [0102]    With reference to  FIGS. 12   a  and  12   b , the core has been rotated around axis  20 ′ and deflector  85  has been moved in direction R 1  to intercept the wire W and bring it in a more external position. In the external position of deflector  85 , a stretch of the extension of wire W is aligned with groove  120 , as shown in  FIG. 12   a . Continuing with a predetermined rotation of the core around axis  20 ′, wire W is wound in groove  120  by running on deflector  85  and exiting needle  21 . In this manner it is possible to reach an angular position of the core around axis  20 ′ where the wire can exit groove  120  and pass through passage  110 . By passing through passage  110 , the wire can return towards the centre of the core where it reaches a next pole to be wound. To achieve this path, deflector  85  is moved in direction Z and direction R 2  to free the wire and avoid collision with core end D. The wire that has been released in this sequence is withdrawn by pulley wheel  30  of the device to create tension so that the wire is pulled though passage  110  and maintained tensioned within needle  21 . 
         [0103]    In other embodiments of the invention the core can be provided with external slots, consequently the needle, instead of passing through the core as shown in  FIG. 1 , will move along the outside of the core to reach end D where groove  120  is located. 
         [0104]    In the sequence of operations of  FIGS. 3   a - 10 , for certain termination paths the translations of the tang  22  can be substituted with rotations of the tang  22  around axis  20 ′ (achieved by rotating the core around axis  20 ′). Therefore in certain cases it can be foreseen to rotate tang  22  and to move gripper  26  in a synchronized manner to obtain connection of the wire to tang  22 . 
         [0105]    The foregoing description of a specific embodiment will so fully reveal the invention according to the conceptual point of view, so that others, by applying current knowledge, will be able to modify and/or adapt for various applications such an embodiment without further research and without parting from the invention, and it is therefore to be understood that such adaptations and modifications will have to be considered as equivalent to the specific embodiment. The means and the materials to realise the different functions described herein could have a different nature without, for this reason, departing from the field of the invention. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.