Patent Publication Number: US-2021178456-A1

Title: Conveyer

Description:
CROSS REFERENCE TO RELATED DOCUMENT 
     The present application claims the benefit of priority of Japanese Patent Application No. 2019-223976 filed on Dec. 11, 2019, the disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     1 Technical Field 
     This disclosure relates generally to a conveyer designed to convey flat or rectangular wires. 
     2 Background Art 
     Conveyers are known which carry rectangular wires for use in, for example, coils of electrical rotating machines. 
     Japanese Patent First Publication No. 2015-89837 discloses a conveyer equipped with stationary plates arranged parallel to each other and carrier plates arranged parallel to each other. Each of the stationary plates arid the carrier plates has a plurality of grooves arranged. adjacent each other in a conveying direction of the rectangular wires. Each of the grooves of the stationary plates is shaped to bear side surfaces of the rectangular wire which face in different angular directions around a length or axis of the rectangular wire. All the grooves of the carrier plates are of a V-shape. The carrier plates serve to lift up the rectangular wire received in first ones of the grooves of the stationary plates, turn the lifted rectangular wire around the axis thereof, and then carry it to following second ones of the grooves of the stationary plates which are located. downstream. of the first grooves in the conveying direction. In this way, the conveyer works to carry each of the rectangular wires and bear the side surfaces of the rectangular wire which are turned around the axis of the rectangular wire, thereby facilitating machining all the side surfaces of the rectangular wire from the same direction. 
     The above conveyer, however, has a risk that when carried at a high speed, the rectangular wire may spring back when lifted up by the carrier plates from the grooves of the stationary plates and. be accidentally dropped from the grooves of the carrier plates. Such a failure in carrying the rectangular wires leads to a difficulty in machining the side surfaces of the rectangular wires. 
     SUMMARY 
     It is, therefore, an object of this disclosure to provide a. conveyer which is capable of carrying a rectangular wire at a high speed and bearing portions of a rectangular wire which are turned around. an axis thereof while being carried. 
     According to one aspect of this disclosure, there is provided a conveyer which conveys rectangular wires and comprises a mounting base, a plurality of rotating discs, and a drive unit. Each of the rotating discs is rotatable about a rotating axis thereof relative to the mounting base. Each of the rotating discs has formed in an outer periphery thereof grooves in which each of the rectangular wires is receivable. The drive unit works to rotate each of the rotating discs about the rotating axis. The rotating discs includes a. preceding upstream rotating disc and a following downstream rotating disc which are arranged to partially overlap each other in an axial direction thereof. The preceding upstream rotating disc and the following downstream rotating disc are arranged to have a supplying groove that is one of the grooves of the preceding upstream rotating disc overlap with a receiving groove that is one of the grooves of the following downstream rotating disc in the axial direction to pass the rectangular wire from the supplying groove of the. preceding upstream rotating disc to the receiving groove of the following downstream rotating disc when the preceding upstream rotating disc and the following downstream rotating disc are located at a given angular position relative to each other. When the rectangular wire is passed from the supplying groove of the preceding upstream rotating disc to the receiving groove of the following downstream rotating disc, the rectangular wire has four side surfaces retained in total by a combination of the supplying groove of the preceding upstream rotating disc and the receiving groove of the following downstream rotating disc. 
     The above arrangements enable a surface of each. of the rectangular wires which faces away from the rotating axis of the rotating disc to be turned when the rectangular wire is passed from the supplying groove of the preceding upstream rotating disc to the receiving groove of the following downstream rotating disc. The conveyer is, therefore, capable of receiving or hearing portions of each of the rectangular wires which face in different angular directions using the grooves during carrying of the rectangular wires. 
     When the rectangular wire is passed from the preceding upstream rotating disc to the following downstream rotating disc in the conveyer, the groove of the preceding upstream rotating disc and the groove of the following downstream rotating disc bear all side surfaces of the rectangular wire, thereby minimizing a risk that the rectangular wire may be accidentally dropped from the grooves of the rotating discs. This ensures the stability in carrying the rectangular wires in the conveyer at a high speed. The conveyer is, therefore, capable of delivering the rectangular wires and machining the surfaces of the rectangular wires at a high speed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will be understood more fully from the detailed description given hereinbelow and from the accompanying drawings of the preferred embodiments of the invention, which, however, should not be taken to limit the invention to the specific embodiments but are for the purpose of explanation and understanding only. 
       In the drawings: 
         FIG. 1  is a perspective view which illustrates a conveyer according to the first embodiment; 
         FIG. 2  is a front view which illustrates a region around three rotating discs of a conveyer in the first embodiment; 
         FIGS. 3(A), 3(B) , and  3 (C) are explanatory views which demonstrate a sequence of operations of a conveyer in the first embodiment; 
         FIG. 4  is a plan view which illustrates a rotating disc installed in. a conveyer according to the second embodiment; 
         FIG. 5  is a perspective view which illustrates a rotating disc installed in a conveyer according to the second embodiment; 
         FIG. 6  is a plan view which illustrates layout of two adjacent rotating discs installed in a conveyer in the second embodiment; 
         FIG. 7  is a perspective view which illustrates a conveyer according to the third embodiment; 
         FIG. 8  is a front view which illustrates a portion of the conveyer viewed from a direction, as indicated by an arrow VIII in  FIG. 7 ; 
         FIG. 9  is an enlarged view of a portion of the conveyer surrounded by a broken line IX in  FIG. 8 ; 
         FIG. 10  is a schematic view which illustrates a conveyer according to the fourth embodiment; 
         FIG. 11  is a perspective view which illustrates a portion of a conveyer according to the fifth embodiment; 
         FIG. 12  is a perspective view which illustrates a portion of a conveyer according to the fifth embodiment; 
         FIG. 13  is a front view which illustrates a portion of the conveyer as viewed from an arrow XIII in  FIG. 12 ; and 
         FIG. 14  is an enlarged view which illustrates a portion of the conveyer surrounded by a broken line WV in Fig,  13 . 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the invention will be described below with reference to the drawings. In the following embodiments, same or similar or equivalent parts will be indicated by the same or similar reference numbers, and explanation thereof in detail will be omitted. 
     First Embodiment 
     The first embodiment will be described below with reference to  FIGS. 1 to 3 . The conveyer  1  is designed to carry the rectangular wires  2  used as, for example, coil segments of a rotating electrical machine. Each of the rectangular wires  2  is made of a straight wire whose outer surface is covered with an insulating coating. Each of the rectangular wires  2  is of a substantially rectangular in cross section and has four surfaces around an axis thereof. 
     The conveyer  1 , as illustrated in  FIGS. 1 and 2 , includes the mounting base  3 , the rotating discs  4 , the drive units  5 , and the machining units  6 . In the drawings, a conveying direction of the rectangular wires  2  (i.e., a direction in which rotating shafts of the rotating discs  4  are arrayed adjacent each other) is represented by an arrow A. Actually, the rectangular wires  2  are conveyed on a path extending along portions of outer edges of the rotating discs  4 . 
     In  FIGS. 1 and 2 , the rotating discs  4  and the machining units  6  are identified using numbers with alphabetic affixes. The same applies to the drawings used for describing the following embodiments. 
     The mounting base  3  is firmly secured to the base  7 . The mounting base  3  .s made up of an array of two L-shaped plates which extend in the conveying direction of the rectangular wires  2 . In the following discussion, for the sake of convenience, one of the plates of the mounting base  3  which is located close to the drive units  5  will also be referred to as the first mounting base  31 , while the other plate which is located close to the machining units  6  will also be referred to as the second mounting base  32 . 
     The conveyer  1  includes a plurality of shafts  8  which are arranged to connect the first mounting base  31  and the second mounting base  32  together. The shafts  8  extend substantially perpendicular to the conveying direction of the rectangular wires  2 . 
     The shafts  8  are arranged at a given interval away from each other in the conveying direction of the rectangular wires  2 . Each of the shafts  8  is supported by the first mounting base  31  and the second mounting base  32  to be rotatable about the axis thereof. 
     The rotating discs  4  are secured to the shafts  8 . Specifically, each of the rotating discs  4  is born by the first mounting base  31  and the second mounting base  32  to be rotatable around. the axis thereof (i.e., the shaft  8  on which each of the rotating discs  4  is mounted. 
     In the following discussion, the rotating discs  4  will also be, as illustrated in  FIG. 1 , referred to as the first rotating disc  4   a , the second rotating disc  4   b , the third rotating disc  4   c  which are arranged in the order from an upstream to a downstream side of a conveying path on which the rectangular wires  2  move in the conveying direction. 
     Alternatively, a selected three of the rotating discs  4  arranged in the conveying direction. of the rectangular wires  2  will also be, as illustrated in  FIG. 2 , referred to as the upstream rotating disc  4   x , the middle rotating disc  4   y,  and the downstream rotating disc  4   z  in the order from the upstream to the downstream side of the conveying path for the rectangular wires  2 . 
     Selected two of the rotating discs  4  arranged in the conveying direction of the rectangular wires  2  may alternatively be, as illustrated in  FIGS. 4(A) to 3(C) , referred to as the preceding upstream rotating disc  4   s  and the following downstream rotating disc  4   t  which is located adjacent and downstream of the preceding upstream rotating disc  4   s  along the conveying path for the rectangular wires  2 . 
       FIG. 1  demonstrate the first rotating disc  4   a  to the tenth rotating disc  4   j . Each of the first rotating disc  4   a  to the tenth rotating disc  4   j  may be designed to include two or more of the rotating discs  4  which are mounted on one of the shafts  8 . In the example of  FIG. 1 , each of the first rotating disc  4   a , the second rotating disc  4   b , the fourth rotating disc  4   d , the sixth rotating disc  4   f,  the eighth rotating disc  4   h , and the tenth rotating disc  4   j  is made up of two of the rotating discs  4  secured to one of the shafts  8 . Although not clearly illustrated in  FIG. 1 , the third rotating disc  4   c,  the fifth rotating disc  4   e,  the seventh rotating disc  4   g , and the ninth rotating disc  4   i  may also be made up of two or more of the rotating discs  4  which are mounted on one of the shafts  8 . 
     The rotating discs  4  are so arranged as to have each of the rotating discs  4  partially overlap a respective one of the rotating discs  4  in the axial direction thereof which is located adjacent in. the conveying direction of the rectangular wires  2 . In the example illustrated in  FIG. 1 , the first rotating disc  4   a  is arranged to have a portion thereof which overlaps a portion of the second rotating disc.  4   b  in the axial direction of the rotating discs  4  (i.e., the lengthwise direction of the shafts  8 ). The same is true for the other rotating discs  4 . 
     Each of the rotating discs  4  has a plurality of grooves  41  which are formed in an outer periphery or circumference thereof and in which one of the rectangular wires  2  is receivable. In this embodiment, each of the rotating discs  4  has the grooves  41  arranged at an interval of 45° away from each other in the axial direction (i.e., the circumferential direction) of the grooves  41 . Each of the rotating discs  4 , i,e., the preceding upstream rotating disc  4   s  and an adjacent one of the rotating discs  4 , i.e., the following downstream rotating disc  4   t  are angularly arranged to have at least one of the grooves  41  of the preceding upstream rotating disc  4   s  overlap or coincide with one of the grooves  41  of the following downstream rotating disc  4   t  in the axial direction of the rotating discs  4  when the preceding upstream rotating disc  4   s  and the following downstream rotating disc  4   t  are located at a given angular position relative to each other. Therefore, when the preceding upstream rotating disc  4   s  and the second downstream rotating disc  4   s  are located at the given angular position, it will cause one of the rectangular wires  2  to be passed from one of the grooves  41  of the preceding upstream rotating disc  4   s  to one of the grooves  41  of the following downstream rotating disc  4   t.  The given angular position is, thus, an angle of the rotating discs  4  which is selected to enable the rectangular wire  2  to be conveyed from one of the grooves  41  of the preceding upstream rotating disc  4   s  to one of the grooves  41  of the following downstream rotating disc  4   t.    
     The above given angular position is, as illustrated in  FIG. 2 , determined in the following manner. 
     If a line passing through an angular position (which will also be referred to as an upstream delivery position) where the rectangular wire  2  is passed from one of the grooves  41  of the upstream rotating disc  4   x  to one of the grooves  41  of the middle rotating disc  4   y  and the rotating axis M 2  of the middle rotating disc  4   y  is defined as a line L 1 , an angle θ 1  which the line L 1  makes with the conveying direction of the rectangular wires  2  is selected to be 45°. If a line passing through. an angular position (which will also be referred to as a downstream delivery position) where the rectangular wire  2  is passed from one of the grooves  41  of the middle rotating disc  4   y  to one of the grooves  41  of the downstream rotating disc  4   z  and the rotating axis M 2  of the middle rotating disc  4   y  is defined as a line L 2 , an angle θ 2  which the line L 2  makes with the conveying direction of the rectangular wires  2  is selected to be 45°. 
     An angle θ 3  through which the middle rotating disc  4   y  rotates about the axis thereof from the upstream. delivery position to the downstream delivery position will, therefore, be 90°. Such rotation through 90° from the upstream delivery position to the downstream delivery position is true for all the rotating discs  4  illustrated in  FIG. 1 . 
     The conveyer  1  is, as clearly illustrated in  FIG. 1 , equipped with the drive units  5  working to rotate the rotating discs  4 . The drive units  5  includes the first drive unit  51  and the second drive unit  52 . Each of the first drive unit  51  and the second drive unit  52  is implemented. by, for example, an electrical motor whose operation is controlled by an electronic control unit, not shown. The first drive unit  51  is arranged to rotate the first rotating disc  4   a,  the third rotating disc  4   c , the fifth rotating disc  4   e,  the seventh rotating disc  4   g , and the ninth rotating disc  4   i.  The second drive unit  52  is arranged to rotate the second rotating disc  4   b , the fourth rotating disc  4   d , the sixth rotating disc  4   f , the eighth rotating disc  4   h,  and the tenth rotating disc  4   j.    
     Specifically, the second drive unit  52  is joined to the shaft  8  on which the tenth rotating disc  4   j  is mounted. The shafts  8  on which the second rotating disc  4   b , the fourth rotating disc  4   d , the sixth rotating disc  4   f , the eighth rotating disc  4   h , and the tenth rotating disc  4   j  have the pulleys  81  secured thereto. The pulleys  81  have the belt  82  wound therearound. In operation of the conveyer  1 , when the second drive unit  52  is activated to rotate the shaft  8  to which the tenth rotating disc.  4   j  is joined, it will cause the second rotating disc  4   b , the fourth rotating disc  4   d , the sixth rotating disc  4   f , the eighth rotating disc  4   h , and the tenth rotating disc  4   j  to rotate synchronously with each other. 
     The first drive unit  51  is joined to the shaft  8  on which the first rotating disc  4   a  is mounted. Although not illustrated, the pulleys  81  around which the belt  82  is wound are also joined to the shafts  8  on which the first rotating disc  4   a , the third rotating disc  4   c,  the fifth rotating disc  4   e,  the seventh rotating disc  4   g , and the ninth rotating disc  4   i  are mounted. When the first drive unit  51  rotates the shaft  8  to which the first rotating disc  4   a  is joined, it will, therefore, cause the first rotating disc  4   a , the third rotating disc  4   c , the fifth rotating disc  4   e,  the seventh rotating disc  4   g , and the ninth rotating disc  4   i  to rotate synchronously with each other. 
     The conveyer  1  is also equipped with a plurality of machining units  6  working to machine end portions of the rectangular wires  2 , The machining units  6  are disposed. one for each pair of the rotating discs  4 . Each of the machining units  6  is located to face at least one of surfaces of a corresponding one of the rectangular wires  2  and works to, for example, press (e.g., elastically deform), cut, or form (e.g., shape) the rectangular wires  2  or strip coating from the rectangular wires  2 . Each of the machining units  6  is located between the upstream delivery position and the downstream delivery position. In the following discussion, a position of the rotating discs  4  where each of the rectangular wires  2  received in the groove  41  is machined by the machining units  6  will also be referred to as a machining position. 
       FIG. 2  indicates the machining positions for the upstream rotating disc  4   x,  the middle rotating disc  4   y,  and the downstream rotating disc  4   z  using arrows P 1 , P 2 , and P 3 , respectively. In the example illustrated in  FIG. 2 , an angle θ 4  which the line L 3  extending between the rotating axis M 1  of the upstream rotating disc  4   x  and the machining position P 1  for the upstream rotating disc  4   x  makes with the conveying direction is set to 90°. Similarly, an angle θ 5  which the line L 4  extending between the rotating axis M 2  of the middle rotating disc  4   y  and the machining position P 2  for the middle rotating disc  4   y  makes with the conveying direction is set to 90°. An angle θ 6  which the line L 5  extending between the rotating axis M 3  of the downstream rotating disc  4   z  and the machining position P 3  for the downstream rotating disc  4   z  makes with the conveying direction is also set to 90°. In other words, each of the machining units  6  illustrated in  FIG. 1  machines a corresponding one of the rectangular wires  2  at a location where an angle which a line extending through the groove  41  in which the corresponding one of the rectangular wires  2  is received and the rotating axis of a corresponding one of the rotating discs  4  makes with the conveying direction is 90°. 
     The operation of the above described conveyer  1  will also be discussed below with reference to  FIGS. 3(A), 3(B) , and  3 (C) each of which demonstrates only selected two of the rotating discs  4  arranged adjacent each other in the conveying direction of the rectangular wires  2  for the simplicity of discussion. One of the selected two rotating discs  4  which is located upstream in the conveying direction of the rectangular wires  2  will be referred to as the preceding upstream rotating disc  4   s.  The other rotating disc  4  located adjacent the preceding upstream rotating disc  4   s  downstream in the conveying direction will be referred to as the following downstream rotating disc  4   t.  In the following discussion, a location where the rectangular wire  2  is designated to be passed from the groove  41  of the preceding upstream rotating disc  4   s  to the groove  41  of the following downstream rotating disc  4   t  will also be referred to as a delivery position. Specifically, the delivery position is a location where one of the grooves  41  of the preceding upstream rotating disc  4   s  is aligned with one of the grooves  41  of the following downstream rotating disc  4   t  in the rotating axial direction of the rotating discs  4  (i.e., a direction in which the axis of the rotating discs  4  extend). 
     First, when the rectangular wire  2  is required to be carried, the drive unit  5 , as demonstrated in  FIG. 5(A) , moves or locates a target one of the grooves  41  (which will be referred to as a. receiving groove) of the following downstream rotating disc  4   t  which is selected to receive the rectangular wire  2  at the delivery position. One of the grooves  41  of the preceding upstream rotating disc  4 s (which. will also be referred to as a supplying groove) in which the rectangular wire  2  is now received, in other words, scheduled to be passed to the receiving groove of the following downstream rotating disc  4   t  is located at the machining position for the preceding upstream rotating disc  4   s.    
     Next, the drive unit  5 , as indicated by the arrow R 1  in  FIG. 3(B) , rotates the preceding upstream rotating disc  4   s  to move one of the grooves  41  of the preceding upstream rotating disc  4   s  in which the rectangular wire  2  is now stored (i.e., the supplying groove  41 ) until the supplying groove  41  reaches the delivery position. At this time, the following downstream rotating disc  4   t  is stopped from rotating. This causes the supplying groove  41  of the preceding upstream rotating disc  4   s  and the receiving groove  41  of the following downstream rotating disc  4   t  to be aligned or coincide with each other in the rotating axial direction of the rotating disc  4 , so that the rectangular wire  2  is received both in the supplying groove  41  of the preceding upstream rotating disc  4   s  and in the receiving groove  41  of the following downstream rotating disc  4   t . This enables the rectangular wire  2  to be passed from the supplying groove  41  of the preceding upstream rotating disc  4   s  to the receiving groove  41  of the following downstream rotating disc  4   t . Upon the above reception of the rectangular wire  2 , the four side surfaces of the rectangular wire  2  are retained in total by a combination of the supplying groove  41  of the preceding upstream rotating disc  4   s  and the receiving groove  41  of the following downstream rotating disc  4   t.  However, one of the side surfaces of the rectangular wire  2  which is placed in contact with or facing the bottom of the supplying groove  41  of the preceding upstream rotating disc  4   s  is different from one of the side surfaces of the rectangular wire  2  which faces the bottom of the receiving groove  41  of the following downstream rotating disc  4   t . In other words, one of the side surfaces of the rectangular wire  2  which faces away from the rotating axis M 4  is different from one of the side surfaces of the rectangular wire  2  which faces away from the rotating axis M 5  of the following downstream rotating disc  4   t.    
     Afterwards, the drive unit  5 , as indicated by the arrow R 2  in  FIG. 3(C) , rotates the following downstream rotating disc  4   t,  while the preceding upstream rotating disc  4   s  is stopped from rotating. The receiving groove  41  of the following downstream rotating disc  4   t  in which the rectangular wire  2  has been received is moved to the machining position for the following downstream rotating disc  4   t . When reaching the machining position for the following downstream rotating disc  4   t,  the rectangular wire  2  will have one of the side surfaces thereof which makes an angle of 90° with, in other words, adjacent that arranged at the machining position for the preceding upstream rotating disc  4   s  around the axis of the rectangular wire  2  and which faces away from the rotating axis M 5  of the following downstream rotating disc  4   t.    
     The conveyer  1  in the above described first embodiment offers the following beneficial advantages. 
     1) When conveying the rectangular wire  2  from one of the grooves  41  of the preceding upstream rotating disc  4   s  to one of the grooves  41  of the following downstream rotating disc  4   t,  the conveyer  1  changes the surface of the rectangular wire  2  which faces away from the rotating axis of the rotating disc  4 . In other words, during carrying of each of the rectangular wires  2  in the conveyer  1 , the respective grooves  41  of the rotating discs  4  support different portions (i.e., the different side surfaces) of the rectangular wire  4 . 
     At a time when the rectangular wire  2  is passed from the preceding upstream rotating disc  4   s  to the following downstream rotating disc  4   t,  the groove  41  of the preceding upstream rotating disc  4   s  and the groove  41  of the following downstream rotating disc  4 t bear all the side surfaces (i.e., the four side surfaces) of the rectangular wire  2 , thereby minimizing a risk that the rectangular wire  2  may be accidentally dropped from the grooves  41  of the rotating discs  4 . This ensures the stability in carrying the rectangular wires  2  in the conveyer  1  at a high speed. The conveyer  1  is, therefore, capable of delivering the rectangular wires  2  and machining the surfaces of the rectangular wires  2  at high speed. 
     2) The drive units  5  of the conveyer  1  work to operate the preceding upstream rotating disc  4   s  or the following downstream rotating disc  4   t  during carrying of the rectangular wires  2  in the following way. First, the drive unit  5  locates one of the grooves  41  (i.e., the receiving groove  41 ) of the following downstream rotating disc  4   t  to the delivery position for the rectangular wire  2 . Next, the preceding upstream rotating disc  4   s  is rotated until a corresponding one (i.e., the supplying groove  41 ) of the preceding upstream rotating disc  4   s  overlaps or coincides with the receiving groove  41  of the following downstream rotating disc  4   t  and then stopped. Subsequently, the drive unit  5  starts rotating the following downstream rotating disc  4   t.  In this way, the conveyer  1  successively passes the rectangular wires  2  from the grooves  41  of the preceding upstream rotating disc  4   s  to the grooves  41  of the following downstream. rotating disc  4   t.  
 
3) In this embodiment, the middle rotating disc  4   y  is scheduled to be rotated through 90° from the upstream delivery position to the downstream delivery position. This enables the conveyer  1  to change or turn the surface of each of the rectangular wires  2  which faces away from the rotating axis of the rotating disc  4  by 90° each time the rectangular wire  2  is passed from an upstream one to a downstream one of the rotating discs  4 . This facilitates the ease with which all the side surfaces of each of the rectangular wires  2  is machined by the machining units  6  while the rectangular wires  2  are being carried by the conveyer  1 .
 
     Second Embodiment 
     The second embodiment will be described below which is different only in structure of the grooves  41  of the rotating discs  4  from the first embodiment. Other arrangements are identical, and explanation thereof in detail will be omitted here. 
     Each of the rotating discs  4  of the conveyer  1  in the second embodiment is, as clearly illustrated in  FIGS. 4 and 5 , equipped with a plurality of different configurations of the grooves  41 . Specifically, the grooves  41  are contoured to conform with configurations of the rectangular wires  2  which are different in shape of cross sections or size from each other. The example demonstrated in  FIGS. 4 and 5 , each of the rotating discs  4  has three types of grooves  41 . In the following discussion, the three types of grooves  41  will also be referred to as the first groove  41   a , the second groove  41   b,  and the third groove  41   c.  The first grooves  41   a  are arranged at a.n angular interval of 45° away from each other in the rotating direction (i.e., the circumferential direction) of the rotating discs  4 . Similarly, the second grooves  41   b  are arranged at an angular interval of 45° away from each other in the rotating direction (i.e., the circumferential direction) of the rotating discs  4 . The third grooves  41 .c are arranged at an angular interval of 45° away from each other in the rotating direction (i.e., the circumferential direction) of the rotating discs  4 . 
     Like in the first embodiment, the rotating discs  4  are, as can been seen in  FIG. 6 , arranged to have a portion of the preceding upstream rotating disc  4   s  overlap a portion of the following downstream rotating disc  4   t  in the rotating axial direction. Specifically, when the preceding upstream rotating disc  4   s  and the following downstream. rotating disc  4   t  are arranged at a predetermined angle (which will also be referred to below as a first angle) away from each other, one of the first grooves  41   a  of the preceding upstream rotating disc  4   s  coincides with one of the first grooves  41   a  of the following downstream rotating disc  4   t  in the rotating axial direction. This enables the rectangular wire  2  which has a cross section or size physically liftable in the first grooves  41   a  to be passed from one of the first grooves  41   a  of the preceding upstream rotating disc  4   s  to one. of the first grooves  41   a  of the following downstream rotating disc  4   t.    
     Although not illustrated, when the preceding upstream rotating disc  4   s  and the following downstream rotating disc  4   t  are arranged at a second angle different from the first angle for the first grooves  41   a,  one of the second grooves  41   b  of the preceding upstream rotating disc  4   s  coincides with. one of the second grooves  41   b  of the following downstream rotating disc  4   t  in the rotating axial direction. This enables the rectangular wire  2  which has a cross section or size physically receivable in the second grooves  41   b  to be passed from one of the second grooves  41   b  of the preceding upstream rotating disc  4   s  to one of the second grooves  41   b  of the following downstream rotating disc  4   t.    
     Similarly, when the preceding upstream rotating disc  4   s  and the following downstream rotating disc  4   t  are arranged at a third angle different from the first angle and the second angle for the first and second grooves  41   a  and  41   b , one of the third grooves  41   c  of the preceding upstream rotating disc  4   s  coincides with one of the third grooves  41   c  of the following downstream rotating disc  4   t  in the rotating axial direction. This enables the rectangular wire  2  which has a cross section or size physically receivable in the third grooves  41   c  to be passed from one of the third grooves  41   c  of the preceding upstream rotating disc  4   s  to one of the third grooves  41   c  of the following downstream rotating disc  4   t.    
     As apparent from the above discussion, the conveyer  1  in the second embodiment is equipped with the rotating discs  4  which have the different types of grooves  41  which are contoured to conform with the rectangular wires  2  which are different in configuration or size thereof from each other. The preceding upstream rotating disc  4   s  and the following downstream rotating disc  4   t  are arranged in a given angular relation to each other to have the same type of grooves  41  coincide with each other when the rectangular wire  2  is passed from the preceding upstream rotating disc  4   s  to the following downstream rotating disc  4   t.  This enables the conveyer  1  to carry a plurality of different types of rectangular wires  2 . 
     Third Embodiment 
     The third embodiment will be described below which is a modification of the first embodiment and equipped with a cover member. Other arrangements are identical with those in the first embodiment, and explanation thereof in detail will be omitted here. 
     The conveyer  1  in the third embodiment is, as illustrated in  FIGS. 7 and 8 , equipped with the conveyer covers  10  and the delivering covers  11 . The conveyer covers  10  are arranged to cover outer edges of the rotating discs  4 , respectively. The conveyer covers  10  have surfaces  12  which face the rotating discs  4  and. are contoured to conform with the outer shape of the outer edges outer circumferences) of the rotating discs  4 . The conveyer covers  10 , therefore, serve as a stopper which avoids accidental removal of the rectangular wires  2  from the grooves  41  of the rotating discs  4  by centrifugal force during carrying of the rectangular wires  2 . 
     Each of the delivering covers  11  is, as clearly illustrated in  FIG. 8 , arranged to cover a place where the rectangular wire  2  is passed from the supplying groove  41  of the preceding upstream rotating disc  4   s  to the receiving groove  41  of the following downstream rotating disc  4   t  and around that place. Each of the delivering covers  11  has the surface  13  which is contoured to conform with the outer shapes of the outer edges of the adjacent rotating discs  4 . The delivering covers  11  are secured to the conveyer covers  10 . Each of the delivering covers  11  is arranged to have an adjustable distance between itself and the rotating discs  4 . 
     The delivering covers  11  are, as can be seen in  FIG. 9 , located closer to the outer edges of the rotating discs  4  than the conveyer covers  10  are. When the rectangular wires  2  partially protrude from the grooves  41  of the rotating discs  4  during carrying thereof, the delivering covers  11  serve to guide the rectangular wires  2  inside the grooves  41 . In other words, when the rectangular wires  2  which partially protrude from the grooves  41  of the rotating discs  4  are being carried toward the delivery positions thereof, they are guided by the delivering covers  11  to correct positions in the grooves  41 . The delivering covers  11 , therefore, eliminates a risk that the rectangular wire  2  which is carried with a portion thereof protruding from the groove  41  of the preceding upstream rotating disc  4   s  may collide with an open edge of the groove  41  of the following downstream rotating disc  4   t  before the delivery position. 
     The conveyer  1  in the third embodiment is, as apparent from the above discussion, equipped with the conveyer covers  10  and thus capable of avoiding the accidental removal of the rectangular wires  2  from the grooves  41  during carrying thereof. This enables the conveyer  1  to rotate the rotating discs  4  at a high speed to carry the rectangular wires  2  at, a high speed. 
     The conveyer  1  in the third embodiment is also equipped with the delivering covers  11  which cover portions of the rectangular wires  2  to be passed directly from one to another of the grooves  41  of the rotating discs  4  and also cover a region around the passed portions of the rectangular wires  2 , thereby ensuring the stability in location of the rectangular wires  2  in the desired positions in the grooves  41  at a time when the rectangular wires  2  are passed from one to another of the rotating discs  4 . This eliminates a failure of the conveyer  1  in passing the rectangular wires  2  from the groove  41  of the preceding upstream rotating disc  4   s  to the groove  41  of the following downstream rotating disc  4   t.    
     The region around the passed portions of the rectangular wires  2  covered by the delivering covers  11 , as referred to above, represents a region which ensures that the delivering cover  11  locates the rectangular wire  2 , as being conveyed with a portion thereof protruding outside the groove  41  of the rotating disc  4 , to the desired position in the groove  41  before the rectangular wire  2  reaches the delivery position. 
     Fourth Embodiment 
     The fourth embodiment will be described below which is different from the first embodiment in structure designed for different lengths of the rectangular wires  2 . Other arrangements are identical with those in the first embodiment, and explanation thereof in detail will be omitted here. 
     The conveyer  1  in the fourth embodiment is, as illustrated in  FIG. 10 , equipped with the stopper  61  installed in each of the machining units  6 . The stopper  61  is designed to be contactable with an end (which will also be referred to as a first end) of a length of the rectangular wire  2 . The first end of each of the rectangular wires  2  contacts one of the stoppers  61 , thereby precisely positioning the rectangular wire  2  in a corresponding one of the machining units  6 . This achieves accurate machining of the rectangular wires  2  in predetermined positions in the machining units  6 . 
     The conveyer  1  is also equipped with the presses  20  each of which presses a second end of the rectangular wire  2  that is opposed to the first end thereof toward the stopper  61 . Each of the presses  20  is equipped with the electrical motor  21 , the guide rail  22 , the slide block  23 , and the pusher  24 . The guide rail  22  extends parallel to the length of the rectangular wire  2  carried by the conveyer  1 . The slide block  23  is moved by the motor  21  to reciprocate in a direction indicated by an arrow B along the guide rail  22 . The pusher  24  is secured to the slide block  23 . The pusher  24  is contactable with the second end of the rectangular wire  2  placed at the machining position. 
     In operation, the conveyer  1  in the fourth embodiment actuates the motor  21  of the press  20  when the rectangular wire  2  received in the groove  41  of the rotating disc  4  reaches the machining position. The motor  21  moves the slide block  23  toward the rectangular wire  2  (i.e., the stopper  61 ) along the guide rail  22 . This causes the pusher  24  secured to the slide block  23  to contact the second end of the rectangular wire  2  farther away from the stopper  61  to thrust or move the rectangular wire  2  toward the stopper  61 . The rectangular wire  2  then contacts at the first end thereof with the stopper  61 , thereby precisely positioning the rectangular wire  2  in a corresponding one of the machining units  6 . 
     The conveyer  1  in the above described forth embodiment works to press the rectangular wires toward the stoppers  61  using the presses  20  to make contact the first ends of the rectangular wires  2  with the stoppers  61  installed in the machining units  6 , thereby ensuring the stability in precisely locating the different lengths of the rectangular wires  2  at the predetermined positions during the carrying of the rectangular wires  2  to achieve accurate machining of the rectangular wires  2  in the machining units  6 . 
     Fifth Embodiment 
     The fifth embodiment will be described below with reference to  FIGS. 11 to 14 , and is different from the first embodiment in that the conveyer  1  is equipped with a structure serving to minimize misalignment of the rectangular wires  2  in the axial direction thereof. Other arrangements are identical with those in the first embodiment, and. explanation thereof in detail will be omitted here. 
     Each of the rotating discs  4  of the conveyer  1  in the fifth embodiment is, as illustrated in  FIGS. 12 and 13 , equipped with two types of grooves  41  which are contoured to conform with two types of cross sections or sizes of the rectangular wires  2 . In the following discussion, the two types of grooves  41  will also be referred to as the first grooves  41   a  and the second grooves  41   b , respectively. The first grooves  41   a  are arranged at an interval of 45° away from each other in a direction of rotation of the rotating discs  4 . Similarly, the second grooves  41   b  are arranged at an interval of 45° away from each other in the direction of rotation of the rotating discs  4 . 
     The conveyer  1  in the fifth embodiment is equipped with the clamp lever  70  and. the release device  9  for each of the rotating discs  4 . Each of the clamp levers  70  is mounted on a respective one of the rotating discs  4  to be rotatable together with the rotating disc  4 . Each of the clamp levers  70  is arranged to rotate relative to the rotating disc  4  within a given angular range. The clamp lever  70  is equipped with the pawls  71  for the grooves  41  of the rotating discs  4 . 
     The clamp levers  70 , as illustrated in  FIG. 12 , include the clamp levers  70   a  and the clamp levers  70   b . The clamp lever  70   a  is mounted on a first one of the preceding upstream rotating discs  4   s  aligned with each other in the rotating axial direction thereof and equipped with four first pawls  71   a  for the first grooves  41   a  and four second pawls  71   b  for the second grooves  41   b.  Similarly, the clamp lever  70   b  is mounted on a second one (which is illustrated as the rotating disc  4   u  in  FIG. 12 ) of the preceding upstream rotating discs  4   s  aligned with each other in the rotating axial direction thereof and equipped with the four first pawls  71   a  for the first grooves  41   a  and the four second pawls  71   b  for the second grooves  41   b.  The clamp lever  70   a  disposed on the preceding upstream. rotating disc  4   s  is located 45° out of phase with the clamp lever  70   b  disposed on the rotating disc  4   u.  The clamp lever  70   a  of the preceding upstream rotating disc  4   s  and the clamp lever  70   b  of the rotating discs  4   u  are, therefore, equipped with the pawls  71  each for the rectangular wire  2  selectively received in any of the grooves  41  of the rotating disc  4 . 
     Each of the rotating discs  4  is, as illustrated in  FIG. 13 , equipped with the spring mechanism  75 . The spring mechanism  75 , as indicated by an. arrow C in  FIG. 13 , works to apply load to the clamp lever  70  at all the time in a direction opposite the direction of rotation of the rotating disc  4 . 
       FIG. 14  demonstrates the spring mechanism  75  applying the load to the clamp lever  70  with the rectangular wire  2  received in the groove  41  of the rotating disc  4 . The pawl  71  of the clamp lever  70 , as illustrated in  FIG. 14 , urges or presses the rectangular wire  2  against a surface of an inner wall of the groove  41  which faces in the direction of rotation of the rotating disc  4 . This firmly holds or clamps the rectangular wire  2 , as received in the groove  41  of the rotating disc  4 , between the pawl  71  of the clamp lever  70  and the face of the groove  41  which faces the direction of rotation of the rotating disc  4 . This eliminates a risk of positional misalignment of the rectangular wires  2  in the grooves  41  of the rotating discs  4  in the rotating axial direction of the rotating discs  4  during carrying thereof. 
     The release device  9  is, as clearly illustrated in  FIG. 13 , mounted. on the base  7 . The release device  9  is equipped with the unclamping lever  91  and the drive mechanism  92  serving as an actuator to move the unclamping lever  91 . The unclamping lever  91  is moved by the drive mechanism  92  in a direction, as indicated by an arrow D in  FIG. 13 , to thrust the clamp lever  70  in a direction (i.e., the direction of rotation of the rotting disc  4 ) opposite a direction in which the spring mechanism  75  presses the rectangular wire  2 . This causes the clamp lever  70  to release the clamping of the rectangular wire  2 . 
     The release device  9  moves the unclamping lever  91  in the direction D in  FIG. 13  when the rectangular wire  2  received in the groove  41  of the rotating disc  4  is located at the delivery position. This releases the clamping of the rectangular wire  2  by the clamp lever  70  when the rectangular wire  2  is passed from the groove  41  of the preceding upstream rotating disc  4   s  to the groove  41  of the following downstream rotating disc  4   t.    
     The conveyer  1  in the fifth embodiment is, as apparent from the above discussion, capable of firmly clamping each of the rectangular wires  2 , as received in the groove  41  of the rotating disc  4 , between one of the surfaces of the inner wall of the groove  41  which faces the direction of rotation of the rotating disc  4  and the clamp lever  70 , thereby minimizing a risk of an error in position of the rectangular wire  2  in the rotating axial direction during carrying of the rectangular wire  2 . 
     The conveyer  1  in the fifth embodiment works to release the clamping of each of the rectangular wires  2 , as achieved by the clamp lever  70 , by means of the release device  9  when the rectangular wire  2  is passed from the groove  41  of the preceding upstream rotating disc  4   s  to the groove  41  of the following downstream rotating disc  4   t . This ensures the stability in passing the rectangular wire  2  from the groove  41  of the preceding upstream rotating disc  4   s  to the groove  41  of the following downstream rotating disc  4   t.    
     Other Embodiments 
     While the present invention has been disclosed in terms of the preferred embodiments in order to facilitate better understanding thereof, it should be appreciated that the invention. can be embodied in various ways without departing from the principle of the invention. The above embodiments are not completely unrelated to each other and may be combined unless otherwise impossible. The components constituting each embodiment are not necessarily essential unless otherwise specified or considered to be essential in principle. The number of the components in the embodiments, numerical values, quantities, or ranges referred to in the embodiments are not limited to specified values unless otherwise specified or clearly considered to be essential in principle. The above described configurations of or positional relations between the components are not necessarily limited to those referred to in the embodiments unless otherwise specified or clearly considered to be essential in principle. 
     The above embodiments may be modified in the following way. 
     1) The rectangular wires  2  carried by the conveyer  1  are described in the embodiments as being used in a coil of an electrical rotating machine, but may alternatively be used in a coil for various types of electrical devices, such as electrical transformers or electrical power supplies.
 
2) The rectangular wires  2  used in the embodiments are shaped to have a rectangular cross section, but however, the conveyer  1  may alternatively be designed to carry wires which are shaped to have a plurality of flat surfaces extending in a length thereof, e.g., polygonal in cross section or shaped to have a combination of flat and circular or round surfaces extending in the length thereof.
 
3) In each of the embodiments, the shafts  8  and the rotating discs  4  are formed by members discrete from each other, but they may alternatively be made integrally of a one-piece member. The rotating discs  4  may be secured directly to the mounting base  3  to be rotatable without use of the shafts  8 .
 
4) In the second embodiment, the rotating discs  4  are designed to have the grooves  41  which are broken down into three types, but however, may alternatively be made up of more than three types of grooves  41 .
 
5) In the fifth embodiment, each of the clamp levers  70  is designed to press the rectangular wire  2  against a first inner surface that is one of the inner surfaces of the groove  41  of the rotating disc  4  in which that rectangular wire  2  is received. The first inner surface faces in the direction in which the rotating disc  4  rotates. The clamp lever  70  may alternatively be engineered to press the rectangular wire  2  against a second inner surface that is one of the inner surfaces of the groove  41  in which that rectangular wire  2  is disposed. The second inner surface faces away from the direction in which the rotating disc  4  rotates. In such a case, the rectangular wire  2  is firmly held or clamped by the pawl  71  of the clamp lever  70  and the second inner surface of the groove  41  of the rotating disc  4 . The unclamping lever  91  of the release device  9  is moved by the drive mechanism  92  is configured to press the clamp lever  70  in a direction opposite the direction in which the rotating disc  4  rotates.