Abstract:
Apparatus and method for winding coils C of at least one electrical conductor W for at least one core ( 11 ) of a dynamoelectric machine and for forming termination leads of the coils, the core having a longitudinal axis (H′), the apparatus and method using a dispensing member ( 20 ) and rotation of the dispensing member ( 20 ) around a rotation axis ( 25 ′) to re-orient the dispensing member between an orientation for winding the coils and an orientation for forming the termination leads. An axis of reference ( 21 ′) for the relative translation of the dispensing member ( 20 ) is positioned parallel and shifted with respect to the longitudinal axis (H′) of the core or coincident with the longitudinal axis (H′) of the core. The rotation axis ( 25 ′) is inclined with an angle that is not at 90° with respect to the dispensing member. In particular the rotation axis ( 25 ′) is inclined by an angle of 45 degrees with respect to the dispensing member ( 20 ) and the rotation axis ( 25 ′) intersects the exit of the conductor during the rotation.

Description:
THE FIELD OF THE INVENTION 
     The present invention relates to solutions for winding cores of dynamoelectric machines by using a needle which dispenses at least one electrical conductor to form coils of a predetermined number of turns. Before and after winding, the needle is used to place termination leads of the coils along predetermined trajectories located around the ends of the core. 
     DESCRIPTION OF THE RELATED ART 
     The needle has a passage for guiding the conductor towards the core during winding of the coils and forming of the termination leads. Feeding of the conductor through the needle passage towards the core occurs by using relative motions between the needle and the core. These motions comprise relative translations and relative rotation motions. 
     For precisely locating the conductor during forming and placement of the termination leads, the needle needs to be relatively moved with respect to the core to deposit the conductor on a predetermined trajectory. At the same time the needle needs to avoid collision with the structure of the core. This requires changing the orientation of the needle with respect to the orientation of the needle used during winding, so that the wire can be deposited correctly and the needle can remain clear of obstacles present on the core. 
     During winding to form the coils, the needle passage where the wire runs is normally positioned perpendicular to the longitudinal axis of the core. The longitudinal axis of the core can be considered as a reference axis, which is normally central and parallel to the extension of the core slots. The slots are the portions of the core where the coils are placed during the winding operations. The needle needs to be re-oriented by a rotation mechanism, which is actuated when passing between the stages of winding the coils and the stages of forming and placing the termination leads. Mechanisms for rotating the needle between these two orientations have been described in U.S. Pat. No. 6,098,912, JP 2003 169455 and EP 1,759,446, or were previously known. 
     Certain trajectory configurations where the termination leads can be positioned have been described in EP 1420505. 
     Mechanisms for rotating the needle need to pass through the interior of the core, or in the spacing existing between external structures of the core. Modern cores need to be compact and therefore allow little room for movement of the needle and the associated rotating mechanisms. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a winding and termination solution having a conductor dispensing nozzle (in the following also referred to as needle) that can be oriented by a mechanism that occupies less space within, or around the core. In this manner smaller and more complex core structures can be wound and terminated 
     The complicated and multiple routings for placing the termination leads around the core require complex structures assembled on the core for support and termination. With respect to these structures the needle needs to move appropriately to deposit the wire and to avoid collision during termination. 
     A further object of the present invention is to provide a winding and termination solution having a conductor dispensing nozzle, which is capable of more variable and programmable movements in order to place the leads along more complicated trajectories. 
     Cores for low voltage applications, like those for automotive applications, are wound with conductors having large section. These conductors require considerable pulling tension on the dispensing nozzle and the related moving mechanism. Consequently, reliable mechanical resistance and low wear of the winding apparatus needs to be guaranteed. 
     A further object of the present invention is to provide a winding and termination solution having a conductor dispensing nozzle that can wind and position termination leads formed of conductors having large sections. 
     A further object of the present invention is to provide a winding solution having a conductor dispensing nozzle that can be easily adapted to wind and position termination leads on cores of different configurations. These and other objects of the invention are achieved with the apparatus according to the claims  1  and  27  and the method according to claims  18  and  35 . 
     Further characteristics of the invention are indicated in the subsequent dependent claims. 
     The above and other objects, features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings which illustrate examples of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a perspective view illustrating a previously known apparatus or like that of JP 2003 169455 according to a condition for winding a core of a dynamoelectric machine. 
         FIG. 1B  is a perspective view illustrating the apparatus of  FIG. 1A  according to another condition for forming and placing termination leads of the coils. 
         FIG. 2  is a partial section view illustrating the apparatus of the invention as seen from directions  2  of  FIG. 3 . 
         FIG. 2A  is a partial section view as seen from view directions  2 A- 2 A of  FIG. 2 . 
         FIG. 3  is a partial section view as seen from view directions  3 - 3  of  FIG. 2  illustrating a winding condition of the apparatus. 
         FIG. 3A  is a partial section view similar to  FIG. 3  illustrating a termination condition of the apparatus, although without the wire conductor present for reasons of clarity. 
         FIG. 4  is a perspective view from direction  4  of  FIG. 2  illustrating the apparatus of the invention according to a condition for winding a core of a dynamoelectric machine. In  FIG. 4  the core is not shown for reasons of clarity. 
         FIG. 5  is a view similar to the view of  FIG. 4 , although illustrating the apparatus of the invention according to a condition for termination of a core of a dynamoelectric machine, therefore in a condition similar to that of  FIG. 3A . 
         FIG. 6  is a partial section view similar to the view of  FIG. 2  illustrating an assembly for supporting and positioning the core in the apparatus of the invention. 
         FIG. 7  is a partial section view from directions  7 - 7  of  FIG. 6 . 
         FIG. 8  is a plan view of  FIG. 2  illustrating a position of the conductor dispensing nozzle in relation to the core in the apparatus of the invention. 
         FIG. 9  is a partial section view from directions  9 - 9  of  FIG. 8 . 
         FIG. 10  is a plan view of  FIG. 2  illustrating a further position of the conductor dispensing nozzle in relation to the core in the apparatus of the invention. 
         FIG. 11  is a partial section view from directions  11 - 11  of  FIG. 10 , although with certain parts displaced by a certain quantity of motion 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to  FIGS. 1A and 1B , a previously known mechanism or like that of JP 2003 169455 is shown for supporting and rotating winding needle  10  during the winding and termination stages. 
       FIG. 1A  illustrates the stage in which the needle  10  is oriented for winding the coils C using wire W. 
       FIG. 1B  illustrates the stage in which the needle  10  is re-oriented by 90° for forming and placing leads of wire W during termination. 
     Wire W comes from a tensioner (not shown), passes through the final passage of needle  10  to reach core  11 . Needle  10  is supported by arm  12 , which is provided with translation motions in directions X, Y and Z for winding and terminating wire W on core  11 . 
     To wind core  11 , thus to form the coils C of wire W in slots  13 , the tubular passage of needle  10  is oriented perpendicular to the longitudinal axis  11 ′ of the core (as shown in  FIG. 1A ). In addition the needle is translated with reciprocation motion in direction X through the core, i.e. parallel to longitudinal axis  11 ′, to deliver wire W in slots  13 . The longitudinal axis  11 ′ of the core is parallel to the extensions of the slots  13 . 
     The translation of the needle occurs by moving arm portion  12 ′ with reciprocating translation parallel to axis  11 ′ and by passing it through the inside of core  11 . During the winding stage, core  11  can be rotated around longitudinal axis  11 ′ to form the heads of the coils, i.e. the cross over portions of the coils for passing from one slot to another. 
     For terminating the core, the tubular passage of needle  10  is oriented parallel to the longitudinal axis  11 ′, as shown in  FIG. 1B . The change of orientation of the needle occurs by rotating arm  12  around pin  14  for an angle of 90° in direction R′. To return the needle back to the winding orientation of  FIG. 1A , arm  12  is reversely rotated around pin  14  for an angle of 90°, therefore arm  12  is rotated in direction R. 
     In  FIGS. 1A and 1B  the mechanisms for rotating the needle around pin  14  and for translating the needle in direction X, Y and Z have been omitted for reasons of clarity. Similarly the mechanism for rotating core  11  around axis  11 ′ has been omitted for reasons of clarity. Exit  10 ′ where wire W leaves the needle passage to reach core  11  is aligned with the axis of pin  14 , as shown in  FIGS. 1A and 1B . Consequently the needle rotates around the instantaneous position of exit  10 ′ during rotations in directions R and R′. In this way wire W does not leave needle  10  during the rotations in direction R and R′. 
     This avoids the formation of unwanted lengths of wire during rotations in direction R and R′. The extra lengths of wire would need to be recovered by the tensioner, or would have to be coursed by the needle along specific trajectories to avoid loosing wire tension. 
     The size and configuration of arm  12  determine the size of the core that can be wound with the solution illustrated in  FIGS. 1A and 1B , therefore arm  12  needs to be substituted for winding and terminating certain core sizes. Arm  12  is cantilevered and extends considerably from pin  14 . This produces a considerable inertia with respect to pin  14 . Consequently, rapidity and precision of the movements of the needle for winding and termination are hindered if arm  12  has to be wide and long in portion  12 ′. 
     With reference to  FIGS. 2 and 3  which illustrate an embodiment of the invention, needle  20  is provided with exit  20 ′ where wire W leaves needle passage  21  to reach core  11 . In  FIGS. 2 and 3 , the needle  20  can be translating in directions X and X′ with reciprocation motion parallel to the longitudinal axis  11 ′ of core  11  to wind wire W in order to form coil C in slots  13 . 
     Needle  20  is seated in a bore  22 ′ of support member  22  (see  FIG. 3 ). Guide member  23  is screwed on to the end of needle  20  to pull flange portion  24  of needle  20  against member  22 . In this way needle  20  becomes fixed to member  22 . Guide member  23  has a flared portion  23 ′ to smoothly guide wire W into passage  21  of needle  20 . Support member  22  is secured to a second support member  26  by means of bolts (not shown), which are located in bores  22 ′ (see  FIG. 5 ). Second support member  26  is assembled to rotate together with pin  25  (see  FIG. 3 ). Pin  25  is assembled to rotate in bore  28 . Bore  28  is located on an end portion of support shaft  27  and is aligned with axis  25 ′. 
     Axis  25 ′ or bore  28  is not inclined at 90° with respect to reference axis  27 ′ of support shaft  27 . 
     Axis  27 ′ can be parallel and distanced with respect to longitudinal axis  11 ′, like is shown in  FIGS. 3 and 3A . Alternatively, axis  27 ′ can be coincident with axis  11 ′ depending on the positioning of needle  20  required for winding and termination. 
     The incline of axis  25 ′ is more than 0° and less than 90°. In particular, the incline can be 45°, like is shown in  FIG. 3 . In addition, axis  25 ′ can intersect the exit  20 ′ of needle  20 , like is shown in  FIG. 3 . Second support member  26  is provided with a gear portion  26 ′, like is shown in  FIGS. 2-5 . Gear portion  26 ′ meshes with gear portion  29 ′ of drive tube  29 . 
     Gear portion  26 ′ rotates around axis  25 ′ by rotating gear portion  29 ′ around axis  27 ′. Rotation of drive tube  29  around axis  27 ′ causes gear portion  29 ′ to rotate around axis  27 ′. 
     A 180° rotation of second support member  26  around axis  25 ′ can occur by rotating drive tube  29  for 180° around axis  27 ′. This causes needle  20  to rotate around axis  25 ′ for 180°. Rotation of needle  20  around axis  25 ′ produces a succession of positions of the section of needle  20  out of the plane of  FIG. 3 . The plane of  FIG. 3  can be considered as defined by axes  25 ′ and  27 ′ and where the position WP for winding is located as seen in a section view. The full 180° rotation of needle  20 , or of axis  21 ′ of passage  21 , around axis  25 ′ brings the section of needle  20  back into the plane of  FIG. 3  to occupy a second position TP (see  FIGS. 3A and 5 ), which is required for termination. The second position TP is characterized by the needle being oriented with the section of passage  21  (see axis  21 ′) rotated by 90° in the plane of  FIG. 3  (see also  FIG. 3A ). 
     Furthermore, due to the fact that the needle passage  21  has rotated around the instantaneous position of exit  21 ′ no extra wire has been pulled through needle  20 . 
     Drive tube  29  is coupled to a connection structure  41  of slide  40  (see  FIGS. 2 ,  2 A and  3 ). 
     Support shaft  27  is assembled within the interior of drive tube  29 . Bushes like  37  of  FIGS. 2A and 3  are interposed between support shaft  27  and drive tube  29  to support rotation of drive tube  29  around support shaft  27 , and therefore the rotation of drive tube  29  around axis  27 ′. 
     Threaded end  66  of drive tube  29  is screwed onto support  60 . Lock nut  61  is screwed around the end  66  of drive tube  29  to secure that drive tube  29  remains screwed to support  60 . The outer ring of bearing  62  is assembled to be fixed on support  60 . The inner ring of bearing  62  is assembled to be fixed on cylindrical member  63 . The end of support shaft  27  is assembled on cylindrical member  63 . Cylindrical member  63  is secured to connection structure  41  by means of bolt  64 , which screws on to the end of cylindrical member  63  to pull flange portion  63 ′ of member  63  against abutment surface  41 ′ of connection structure  41 , as shown in  FIG. 2A . 
     The end of support shaft  27  which is assembled through member  63  becomes pulled by bolt  65  to abut against member  63  in abutment surface  63 ″. In this way support shaft  27  is secured along axis  27 ′ and is impeded from rotating around axis  27 ′. 
     Slide  40  is capable of translating with reciprocation motion in directions X and X′ (see  FIG. 2 ), and therefore translates parallel to axis  11 ′ of the core, on guides  42  of the apparatus frame  50 . To achieve this motion, motor  43  rotates screw  44 . Screw  44  engages threaded sleeve  45  of slide  40 . Consequently, forward and opposite rotations of motor  43  cause slide  40  to translate with reciprocation motion in directions X and X′. 
     With reference to  FIGS. 2 and 3 , drive tube  29  is assembled to slide through bore  31  of pulley wheel  30 . A key  32  integral with pulley wheel  30  engages key way  34  of drive tube  29 . Pulley wheel  30  is assembled on frame  50  of the apparatus and can be rotated by motor  35  using belt transmission  36 . Motor  43  and  35  are assembled on frame  50  of the apparatus. 
     Forward and opposite rotations of motor  35  cause rotation of drive tube  29  around axis  27 ′. This causes gear portion  29 ′ to rotate around axis  27 ′. Consequently, second support member  26  rotates around axis  25 ′ for causing needle  20  to rotate around axis  25 ′, like has been described above when passing between the needle orientations for winding and termination. 
     Wire W reaches needle  20  from a tensioner (not shown) by passing through guide tube  38 , which is fixed to a clamp ring  39  (see  FIGS. 2 and 2A ). The clamp ring is fixed to member  60  so that guide tube  38  rotates with drive tube  29  around axis  27 ′. Consequently wire W rotates around axis  27  in synchronism with the rotation of needle passage  21  around axis  25 ′ in order to avoid that wire W remains entangled or hindered in its motion towards the core during winding and termination. 
     The portion of the apparatus of the invention that is required to travel through the core comprises drive tube  29 , support shaft  27 , needle  20 , member  22 , member  26  and member  23 . As shown in the  FIGS. 2-6 , drive tube  29  and support shaft  27 , which are primary members for supporting the needle have a coaxial configuration which can be extremely compact in a transverse direction with respect to the longitudinal axis  11 ′ of the core. This makes it possible to wind cores having interiors of reduced size, therefore cores that are more compact. 
     The configuration of drive tube  29  and support shaft  27  make it possible to have extremely optimized inertia, therefore these parts can be rapidly and precisely translated and rotated by motors  35  and  43 . 
     Needle  21  can be easily substituted by releasing and securing guide member  23  where cores requiring different winding and termination specifications need to be processed and therefore require needles of other sizes. Similarly, the entire assembly consisting of drive tube  29  assembled on support shaft  27 , member  26  assembled on support shaft  27 , member  22  assembled on member  26  and needle  20  assembled on member  22  can be disassembled as a unit by disassembly of drive tube  29  and support shaft  27  from connection structure  41 . This entire assembly forming a unit can be substituted with another unit of different size when requiring to wind cores having different configurations, for example when requiring to process significantly different core heights. 
     Member  22  can be substituted with another similar member of different size to position needle  20  in a required relation with respect to axis  25 ′ or axis  27 ′. In this way the angle between the rotation axis  25 ′ and the reference axis  27 ′, or between the rotation axis  25 ′ and the axis  21 ′ of the passage, can be maintained constant or changed. 
     The tension exerted on wire W for winding and termination is mainly supported on drive tube  29  and support shaft  27 . Drive tube  29  and support shaft  27  are well supported by bearing  62  and bushes  37 , therefore high tension of wire W can be reliably supported by the apparatus when winding and terminating large size conductors. 
     By means of programmable rotation of motor  35 , needle passage  21  can rotate around axis  25 ′ as a function, for example of the position of needle  20  during winding and termination. The programmability of the rotation of needle passage  21  around axis  25 ′ can be applied for winding turns or forming termination leads along predetermined trajectories with respect to the core, and also according to predetermined sequences of motion of the apparatus. For example, needle  20  can be rotated around axis  25 ′ so that it remains out of the plane of  FIG. 3  for certain stages of termination. The reason can be for allowing the needle to move on predetermined trajectories necessary for coursing the leads and for clearing certain structure that are present on the core. With reference to  FIG. 6 , core  11  is shown supported and positioned by means of tubular member  70 . More particularly, core  11  is seated in groove  71  of tubular member  70  for centering core  11  and positioning it with respect to centre axis  70 ′ of tubular member  70 . Therefore longitudinal axis  11 ′ can coincide with centre axis  70 ′. Centre axis  70 ′ can be the axis of symmetry of tubular member  70 . 
     Arms  72  are hinged in  73  to appendixes of member  70 . Portions  72 ′ of arms  72  are required to press on the external surface of core  11 , as shown in  FIG. 6  to firmly press on core  11  when it is seated in groove  71 . Portions  72 ′ are maintained in contact with the core by the pressing action of pressing members  74  on end portions of arms  72 , as shown in  FIG. 6 . Pressing members  74  are assembled to slide on tubular member  70  in radial directions  75 ′ to press on end portions of arms  72  by means of the preload force of springs  75 , as shown in  FIG. 6 . 
     By pressing in opposite direction  75 ″ on portion  78  of arms  72 , i.e. against the preload force of springs  75 , arms  72  release the pressing action on the core, and also rotate away to allow core  11  to be moved in direction X′ for extraction of core  11  from tubular member  70 . 
     Member  70  is supported on the axial end  76 ′ of ring member  76 , as shown in  FIG. 6 . A key and slot connection (not shown) between member  70  and ring member  76  (with the key and the slot that extend parallel to axis  70 ′), couples member  70  to ring member  76  for their rotation together around axis  70 ′. 
     Ring member  76  is supported on radial bearings  77  for rotation around axis  70 ′. Bearings  77  are supported on portion  93  of platform  94   
     Member  70  is locked to ring member  76  along axis  70 ′ by means of lock mechanism  80 . Lock mechanism  80  is a rapid lock and release coupling mechanism that allows member  70  to be easily and rapidly disassembled and reassembled with respect to ring member  76 . 
     Member  70  can be substituted when requiring to seat cores of different configuration that need to be wound and terminated. 
     Mechanism  80  is provided with a shaft member  81 , which is assembled to pass through an end bore of member  70 , as shown in  FIG. 6 . Shaft member  81  is normally pressed in direction X′ by the preload of spring  81 ′, which presses on the upper portion of member  81 . 
     Portion  80 ′ of shaft member  81  is threaded and screws into a threaded bore of plate member  82 , as shown in  FIG. 6 . Pin  83  is fixed in a cross manner near an end of member  80 , as shown in  FIGS. 6 and 7 . 
     With reference to  FIG. 7 , plate member  82  can be rotated between a position  80   a  and a position  80   b  (shown with dashed line representation) and vice versa around axis  70 ′. In position  80   a , plate member  82  secures member  70  to ring member  76 . In position  80   b  of plate member  82 , member  70  results unlocked and therefore member  70  can be disassembled from ring member  76 . 
     By screwing shaft member  81  on plate member  82  (by means of the rotation in direction  85 ), plate member  82  is pulled against shelf  84  of member  70  to secure member  70  to ring member  76 ; see position  80   a  of plate member  82  in  FIGS. 6 and 7 . 
     By unscrewing shaft member  81  (by means of a rotation in direction  86 ), plate member  82  is released and rotated to the position  80   b . More particularly, plate member  82  is rotated to the position  80   b  after having unscrewed shaft member  81  until pin  83  is brought against plate member  82  and moved into slot  87  of plate member  82  (see  FIG. 7 ). When pin  83  is seated in slot  87 , rotation  86  rotates member  82  to position  80   b.    
     When member  70  is reassembled on ring member  76 , pin  83  can be brought out of slot  87  by screwing shaft member  81  using rotation in direction  85 . The initial effect of the rotation in direction  85  is that of bringing plate member  82  to position  80   a  for locking. By pressing shaft member  81  in direction X″, therefore against the pushing action of spring  81 ′, pin  83  is brought out of slot  87 . Continuing with the rotation in the direction  85 , shaft member  81  is screwed into the threaded bore of plate member  82  so that plate member  82  is pulled against shelf  84  of member  70  to secure member  70  to ring member  76 . Extension  88  of member  70  acts as an abutment surface to maintain position of plate member  82  and react during the screwing rotation of shaft member  81 . The action of spring  81 ′ maintains a certain pull on the thread existing between shaft member  81  and plate member  82  to maintain pin  83  secure in slot  87 , when member  70  is removed for substitution. 
     Shaft  90  of motor  91  is coupled to ring member  76  by means of a conventional conical coupling  92 . Motor  91  is flanged to portion  93  of platform  94 . Platform  94  is assembled on guides  95  to translate in directions Y and Y′ by means of a programmable motor drive (not shown). Guides  95  are assembled on a second platform  96 , which move on guides  98  towards and away with respect to an observer view of  FIG. 6 , therefore perpendicular to directions Y and Y′. The second platform  96  accomplishes this movement by means of a programmable motor drive (not shown) which turns screw  97 . 
     Motions of platform  94  in directions Y and Y′ and motions of second platform  96  towards and away with respect to an observer view of  FIG. 6  can be used to position core  11  during termination operations. Motions of second platform  96  towards and away with respect to an observer view of  FIG. 6  can also be used to position core  11  during winding, for example to stratify wire W when winding the coils. 
     The motion of the second platform  96  towards and away with respect to an observer view of  FIG. 6  can be used to carry away the finished core, or for positioning the new core in relation to the work area of the apparatus. During this motion, portions  78  of arms  72  can come in contact with a cam surface (not shown) having a profile for moving arms  72  away from the core and therefore freeing the core so that it can be unloaded and substituted with another core to be processed. 
     With reference to  FIGS. 8 and 9  at the end of winding a coil portion C 1 , needle  20  has wire W extending to the coil. Wire W can be extending from core  11  along an extension line  105  that is parallel to the longitudinal axis  11 ′ of the core, as shown in  FIG. 9 . In  FIGS. 8 and 9  needle  20  is oriented in a first orientation  103  with respect to core  11 , in which exit  20 ′ can be positioned within the perimeter of the core  11  and facing in a direction  102  away from the axis  11 ′ of the core. Successively, wire W may need to be laid as a termination lead like  100  on core  11  (shown with dashed line representation in  FIG. 8 ), i.e. along an external portion  101 , which can be a channel, like is shown in  FIGS. 9 and 11 . 
     To place the lead like  100 , needle  20  can be kept stationary and core  11  can be rotated around wire extension line  105 . The result reached is shown in  FIG. 10  where needle  20  has become oriented according to a second orientation  104  with respect to core  11 , i.e. with exit  20 ′ facing in a direction  102 ′ towards axis  11 ′ of the core and a portion of needle  20  is positioned external to the core. In certain cases this second condition may not be with the needle external to the core, for example when the lead needs to be positioned on a wide axial face of the core. 
     The rotation of core  11  around extension line  105  can be achieved by a combination of translating platform  94  in directions Y Y′, translating second platform  96  towards and away with respect to the observer view of  FIG. 6 , i.e. perpendicular to the movement in directions Y and Y′, and rotation of motor  91 , i.e. rotating core  11  around axis  11 ′. 
     After the condition shown in  FIG. 10  is reached, needle  11  can be translated in direction X″ to align exit  20 ′ with external portion  101  of core  11 , as shown in  FIG. 11 .  FIG. 11  shows that exit  20 ′ can be very near to portion  101  to achieve that wire W can be deposited with accuracy and without pulling an excessive amount of wire from needle  20  during a successive rotation Z 1  of the core  11  around axis  11 ′ for laying the lead like  100 . The phantom line representation  107  of needle  20  and support members  22  and  26  shown in  FIG. 9  illustrates how there can be interference with a termination tang  106  of the core when moving the needle in direction X″ for termination. The previously described rotation around an extension line like  105  avoids such interferences. 
     It should be contemplated that instead of moving core  11  as described above for rotation around an extension line like  105 , needle  11  could be rotated around an extension line like  105  to reach the relative position of needle  20  with respect to core  11  as shown in  FIGS. 9 and 10   
     It will be understood that the foregoing is only illustrative of the principles of this invention, and that various modifications can be made by those skilled in the art without departing from the scope and spirit of the invention.