MXPA96004379A - Method and devan apparatus - Google Patents

Abstract

The present invention relates to a winder for winding a wire material from a wire material supply source around a work piece having an external surface, said apparatus comprising: a first winding device for forming a first winding on the workpiece by moving a nozzle unit, said nozzle unit has an end through which the wire material coming from the source of wire material to the workpiece and a guide unit and operating in such a manner that the wire material from the nozzle unit is joined around a joining portion of the workpiece and moved in a three dimensional direction by the guiding unit cooperating with the movement of the unit of nozzle, to thereby form a first winding on the workpiece, and a second winding device for forming on the workpiece a second winding different from the first winding by the movement of the nozzle unit in directions parallel and normal to the axis of the workpiece, said nozzle unit remaining exterior to the external surface of said workpiece during the formation of the second winding

Description

~ - * METHOD AND WRAPPING DEVICE BACKGROUND OF THE INVENTION The present invention relates to a winder for winding a wire material around a work piece and more particularly to a winder and to a method for forming a wire spool. leakage magnetic field in relation, for example, to a deflection yoke as a workpiece. • The deflection yoke as used for a ray tube cathode co, or, for example, a television receiver requires a magnetic field leakage protection coil (VLF) to protect a magnetic field from leakage due to electronic rays and a deflection coil to deflect the electron beam. Recently, in the performance of a winding operation in relation to a deflection yoke, there has been a strong demand to perform integrally the VLF coil winding and the half pair deflection winding of a single winder. This is due to the demand of energy saving in the operation of winding of yoke coil deviation. However, it is considered difficult to realize the VLF winding and the deflection coil winding integrally between them by means of a single winder. In general, for The formation of a VLF winding employs a method of winding the wire material around the deflection yoke by a dedicated machine while maintaining the horizontal deflection yoke. If both the VLF winding and a deflection coil winding are to be carried out integrally by means of a single winder, a simple combination of a conventional VLF winder and a conventional deflection bobbin winder is complicated structure in such a way that, for example, when the deflection coil winding operation goes to the winding operation VLF, or vice versa, it becomes necessary to change the orientation of the dispersion yoke, for example, from a state of vertical orientation to a state of horizontal orientation which results in an increase of n? ero of working time. Conventionally, the winding apparatus for such a deflection yoke is presented in U.S. Patent Nos. 5484113 and 5419503. The nozzles employed in these prior art techniques use rolls as guide members to guide a vertically inserted wire material, on the right hand side. or upper left or in the lower right or left. However, by simply using such rollers or guide members for the nozzle, it is difficult to perform a VLF winding and a deflection coil winding together because the wire material introduced from the nozzle can not be well guided so that approach the slots formed in several smaller parts of the deflection yoke. 5 COMPENDIUM OF THE INVENTION The present invention was made to eliminate the problems described above and an object of the present invention is to provide a winder that can wind a material of ", * Wire in various ways in various directions while maintains a work piece such as a deflection yoke in a certain orientation, and also provides a winding method that makes use of such an apparatus. The above described object of the present invention can be achieved by the use of a winding apparatus that comprises: a nozzle unit for supplying a wire material from a supply source of wire material to a work piece; a first winding device for forming a first winding by moving the wire material from the nozzle unit in a three dimensional direction after joining the wire material around a joint part of the work piece through a drive unit cooperating with the movement of the nozzle unit; and a second winding device to form in the piece a second winding different from the first winding by moving the nozzle unit in parallel and normal directions to the axis of the workpiece, respectively. In the present invention, since the wire material from the wire supply source is wound around the work piece, the first winding device can form the first winding in the work piece by joining the wire material which comes from the nozzle unit in the joining part of the work piece and then - moving it in three-dimensional directions by means of the cooperation of the nozzle unit and the guide unit. In addition, the second winding device can form the second winding different from the first winding by displacing the nozzle unit in directions parallel and normal to the workpiece axis, respectively. When the work piece is, for example, the structure of the deflection coil for a cathode ray tube, the first winding corresponds to a deflection coil and the second winding corresponds to a magnetic field leakage protection coil. Furthermore, when the first winding and the second winding are formed, it is not necessary to change the orientation of the workpiece.

In the present invention, the upper end of the nozzle unit from which the wire material is introduced is substantially in the form of an L with a projection of a size set in such a way that the nozzle is allowed to pass through. throughout each part of the work piece. By such arrangement, the upper end of the unit can enter the smaller parts, such as grooves, of each part of the workpiece so that the first winding and the first winding can be secured. second winding in the corresponding parts of the workpiece, respectively. The above-described object of the present invention can be achieved by means of a winding for winding a wire material that comes from a power supply source. wire material, said method is characterized in that a first winding is formed in the work piece in such a way that the wire material of the wire material supply source is fed to the work piece by means of a mouthpiece unit and after joining around a joining portion of the workpiece, moves in a three-dimensional direction by means of a guiding unit cooperating with the movement of the nozzle unit, and a second winding different from the first winding is formed in the workpiece. work by moving the nozzle unit in parallel and normal directions to the axis of the workpiece. The above-described object of the present invention can be achieved by a winding method for winding a wire material coming from a source of wire material, said method being characterized in that a second winding is formed in the work piece "by means of the displacement of a nozzle unit, through which the wire material is fed? work, in parallel and normal directions to the ee of the work piece and a first winding different from the second winding is formed on the work piece in such a way that the wire material coming from the nozzle unit is moved in one direction three-dimensional after his joining around the joint of the work piece by means of the nozzle unit and a guide unit which cooperates with the movement of the nozzle unit. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of an apparatus of fully wound in accordance with one embodiment of the present invention; Figure 2 is a perspective view showing a nozzle unit carrier, a mechanical part around a nozzle unit of the winder of Figure 1, a workpiece and a workpiece holder; Figure 3 is a view showing an essential part of the nozzle unit; Figure 4 is a diagram showing an initial winding operation of a horizontal deflection coil; Figure 5 is a diagram of an example showing an intermediate stage of the horizontal deflection coil winding operation; The figures > A to 6H are diagrams illustrating in greater detail the winding step of the deviation coil hor i zo to 1; Figures 7A to 7E are diagrams illustrating an operation of joining an end of a wire material around a pin prior to winding a magnetic field leakage protection coil; Figures 8A to 8E are diagrams illustrating in greater detail the step of winding the protection coil. of magnetic field of f ga; and Figure 9 is a perspective view of a winding apparatus in accordance with another embodiment of the present invention. PREFERRED MODALITIES OF THE INVENTION Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It will be noted that, although the following embodiments include several types of technically preferable limitations since they are practically preferred examples of the present invention, the present invention is not always limited to these examples unless specifically stated otherwise in the next description. Figure 1 is a perspective view of a winder in its entirety in accordance with a preferred embodiment of the present invention. As shown, guide rails 12, 12 are fixed on a base 10 of a winder. These guide rails 12, 12 are fixed on a base 10 of a winder. These guide rails 12, 12 movably support a guide unit carrier 14 and a nozzle unit carrier 16 in the direction of arrow X. The guide unit carrier 14 can be moved and passed in the direction of arrow X by rotating a feeder screw 14b by means of the operation of a motor 14a. In addition, the nozzle unit carrier 16 can be displaced and placed by rotation of a feeder screw 16b by the operation of a motor 16a. The feeder screw 16b engages a nut portion 16c of the nozzle unit holder 16 and both the feed screw 16b and the nut part 16c are shown in enlarged form. The guide unit carrier 14 is equipped with a post 18 whose drive section < illustrated) can move and position a support member 19 in the direction of arrow Z (vertical direction). The support member 19 is equipped with an upper guide unit 301 and a lower guide unit 302 which are arranged in parallel therebetween in a substantially horizontal direction. The upper guide unit 301 is equipped with an activator 301a by means of which activation a hook 301b shown in FIG. 2 removably detaches the wire material W in the form of a sandwich. In the same way, the lower guide unit 302 of FIG. 1 is equipped with an activator 302a by means of which operation a hook 302b shown in FIG. 2 can stop the wire material 302b in a sandwich shape. In addition, the nozzle unit carrier 16 of FIG. 1 is equipped with a post 30. The post 30 is equipped with a nozzle unit support section 31 that can be positioned and moved in the direction of the Z-arrow. by a driving section 31a comprising a motor. As shown in Figure 2, the nozzle unit support section 31 is equipped with a motor 221, a band 222, a wire material retainer 225 and a nozzle unit 201. Around a pulley 221a, a pulley 221b and a pulley 221c of the driving motor 221, the nozzle unit 201 can be spaced at a predetermined angle in an alpha direction about an axis C. The retainer 225 of wire material has the function of stopping the supply of wire material W towards the nozzle unit 201 by the operation of a trigger 226. Next, the nozzle unit 201 will be described. 5 As shown in figures 2 and 3, the nozzle unit 201 may be spaced in the direction of the alpha arrow as described above. The nozzle unit 201 is equipped with side plates 201a, 201a between which ^ ** ^. find 3 guide rollers 205, 205 and 204, one member 202 of upper end and a guide member 203 for bringing the wire material to the outside. The two guide rollers 205, 205 are provided rotatably between the side plates 201a, 201a. The remaining guide roll 204 is provided in the form rotating on the side of the upper end member 202. The upper end member 202 corresponds to the upper end of the nozzle unit 201 and is equipped with a passage 202a to allow the wire material W to pass through and at the end of the passage 202a a guide member 203. The guide member 203 is of an abrasion-resistant material, eg, ruby or ceramic to serve as a guide member for carrying out the wire material W. The upper end member 202 projects into the horizontal direction and it has substance the shape of a ^ 'lateral convex cylinder. Accordingly, the nozzle unit 201 has the upper end member 202 in general L-shaped. The lateral width L of the nozzle unit 201 is smaller than the internal diameter of an opening 21b of the work piece K shown in figure -i. Furthermore, the projection length TH of the guide member 203 is such that the guide member 203 can penetrate into all minor parts of a VLF winding web B of the workpiece work Y of figure 2 and the DHP diameter of the guide member 203 can also enter all the minor parts of the winding part B VLF, the wire material W is inserted outside the guide member - - 203 by means of passage 202a by guide rollers 205, 205 and the guide roller 204 as shown in Figure 3. The wire material W is carried from the source 43 of , < - supply of wire material if a predetermined tension is applied to the intermediate part of wire material by means of a tensioner 44. A workpiece holder 70 presented in figure 2 is provided with a plate 401 for receiving the wire. work that is a part that supports the work piece K in a stabilized state. The workpiece is supported on the receiving plate 401 with the central axis CK of the same that extends in the vertical direction. The work tool holder 70 can be spaced at a predetermined angle in the direction of the arrow and by the operation of a rotating section 73. In the present embodiment, the work piece K is the structure of a deflection yoke provided in the cathode ray tube of a television receiver and has the following structure. That is, the work piece K of FIG. 2 is, for example, a deviation yoke of al to vision and has substanc i. to 1 men the shape of a funnel. When the work piece K is mounted on the cathode ray tube, the opening 21a of the work piece K is positioned on the fluorescent surface of the cathode ray tube and the smaller opening 21b is arranged on the neck side of the cathode ray tube. cathode ray tube. The workpiece K is provided with a plurality of latching bands 21c and a plurality of winding slots 21d. In addition, the smaller opening 21b is equipped with snap-on straps 21x. These strips 21c of snap-in, winding slots 21d and strips 21: < of hooking are parts around which a deflection coil is wound. The work piece K is equipped with a winding part B corresponding to a part where a coil of / * "- magnetic chair field protection (VLF) is formed in the vicinity of the winding grooves 21d. of the main body supply is constituted by the wire material retainer 225, the rotary pulse circuit section 160 and the nozzle unit 201. The rotary pulse section 160 is constituted by the aforementioned activation motor 221, the band 222, the pulleys 221a, 221b and 221c.

In addition, a first winding de 300 shown in FIG.

Figure 2 is the part where the winding is formed in the first direction by unlocking the wire material W in a three-dimensional direction after joining the wire material W in the joint parts in the work piece K which corresponds to the snap strips 21c and 21 x per unit cié bctquil the 201 to supply the wire material material W from the source 43 wire material supply of Figure 2 to the workpiece, the upper guide unit 301 cooperating with the movement of the nozzle unit 201. This first Winding is the deflection coil described above. In addition, a second winding de 400 is the part where a second winding different from the first winding is formed on the work piece by moving the nozzle unit 201 in parallel directions and normal to the CK of the workpiece. This second winding is the magnetic field leakage protection coil (VLF). In addition, the first winding de 300 is constituted by the nozzle unit 201, the upper guide unit 301, the lower guide unit 302 and the workpiece holder 70. In addition, the second winding de 400 is constituted by the nozzle unit 201 and the workpiece holder 70. A control section 6 0 controls the activators 301a, r ~ 302a, the activation section 31a, the activation motor 221, the motors 14a, 1b, the activator 226 and the operation of the rotating section 73 of FIG. 2. A further description will be made of a method for forming a deflection coil 450 and a magnetic field protection coil 501. of leakage of the work piece K co or the deviation yoke of figure 2 by using the winder described above. DEVIATION OPERATION OF DEFLECTION COIL First, an example of the formation of the deflection coil in the workpiece K. Will be described. This deflection coil is the first winding 450 that is applied to the work piece by use of the first winding de 300. The winding material W of Figure 3 is applied with a predetermined tension force by means of a tensioner 44 for the wire material W to become flat when fed from the source of wire material, then the wire material W passes along the path 202a by means of the guide rollers 205, 205 and 204 of the nozzle unit 201 and carried away from the first guide member 203. The wire material W has substantially an L-shape on the guide roller 204 and exits horizontally from the guide member 203.? * The upper end Wl of the wire material W joins It is decided that when the nozzle unit holder section lowers the nozzle unit 201 towards a Z direction as indicated by an arrow, the nozzle unit 201 passes the lengthwise. opening the opening 21b from the opening 21a of the workpiece K. Then, the hook 301b of the upper guide unit fixes the upper end of the wire material W in the form of a sandwich. Then, the wire material W is guided towards the rear part of the joint pin 77 and, in this step, the work piece holder 70. is spaced at a predetermined angle in the + theta direction by the operation of the rotating section 73 by which it is considered that the upper guide unit 301 has moved relative to the + Y direction of FIG. 4. After this, the guide unit 301 is displaced in the Z direction to cause the support of the ftr part. Work 70 of Figure 2 is again spaced by a predetermined angle in the -theta direction so it is considered that the upper guide unit 301 has been displaced relatively in the -Y direction. Therefore, the wire material W held by the guide unit 301 is attached around the joint pin 77. The bonding of the wire material W around the pin 77 is made several times. Next, as shown in figure 5, when operates the nozzle holder 31, the nozzle unit 201 performs a winding operation of the deflection yoke in three dimensional form. That is, by movements of the nozzle unit 201 in the Z and X directions and the movements of the upper guide units 301 and 302 and below, the wire material W forms the first three-dimensional winding 450 that passes around the hook strips 21c and 21? which serve as joining sections of the work piece K, in this case, by displacement of the wire material from the unit of nozzle 201 in a three-dimensional direction after its attachment around the engaging pieces 21c and 21x, the deflection coil 450 is formed as the first winding. In figure 5, a way is shown how the material of The wire W is joined around the hook strip 21c "- by means of the cooperation of the upper guide unit 301 with the nozzle unit 201 which is located above the opening 21a of the workpiece. the nozzle unit 201 is located below the 5 openings 21a and 21b, it is possible to join the wire material W around the hooking strip 21x by means of the cooperation of the lower guide unit 302 and the nozzle unit 201. J Therefore, it is possible to form what is known as a The first three-dimensional winding of what is known as the chair type (deviation coil) 450. In addition, a circumferential winding 500 can be applied in the winding slot 21d of the workpiece. That is, when the workpiece holder 70 rotates in clockwise, for example, by the operation of the rotation section 73, the wire material W extending harizatally from the upper end member 202 of the nozzle unit 201 is gently wound throughout of winding slot 21b to form the circumferential winding 500. Then, after the formation of the circumferential winding 500 along the winding slot 21d, the upper end member 202 of the nozzle unit 201 moves towards the band A of engagement of the piece of work K and the wire material W passes along the latching band A so that the adjustment is completed for the initiation of the winding 501 of the magnetic field leakage protection coil (VLF) described below. Now, an example of how the deflection coil is wound in the form of a chair will be described, with further details with reference to Figures 6A to 6H. Figures 6A to 6H show the steps for the formation of a chair-type deviation coil on the workpiece K, respectively. The member 202 and upper end of the nozzle unit 201 is held in a horizontal position. In the figure, the member 202 and upper end of the nozzle unit 201 elevates the wire material W along the direction Zl from the inner part of the work piece K and, in figure 6B, the unit 301 of superior gula keeps the wire material. Then, when the workpiece K rotates at a predetermined angle in the direction Rl, the conditions presented in figures 6C and 6D are observed and the wire material W is wound along the circumference of the workpiece. Then, as shown in Figure 6E, the nozzle unit 201 reaches the opening 21b through the opening 21a of the workpiece K and the lower guide unit 302 maintains the wire material W. Then, the f " * Lower guide unit 302 pulls the wire material W off as shown in FIG. 6F and rotates the work piece K in the direction of P.2 so that the wire material is wound back to the bottom of the pipe. the length of the neck portion of the work piece K and, finally, the wire material W is wound in the form of a chair as shown in FIG. 6H. Therefore, the winding of the deflection spool can be made with the type of chair in a simple way through the cooperation of the upper guide unit 301 with the lower guide unit 302. OPERATION OF WATER LEAK PROTECTION COVER OF FIRE MAGNETIC FIELD < 'VFL) In the winding operation for the protection coil of 1. 5 leakage magnetic field (VFL), the upper end member 202 of the nozzle unit 201 is displaced towards r- "" down towards a point b of the winding part B of the leakage magnetic field protection coil ( VLF) while supplying the wire material W. Then, the workpiece holder 70 rotates counterclockwise (in the + theta direction) such that the upper end member 202 of the Nozzle unit 201 is outside a point d of winding part B.

~ Then, the upper end member 202 of the nozzle unit 201 moves in the z direction to form a position above a point e of the winding part B. In addition, the workpiece rotates clockwise (theta-direction) to allow the upper end member 202 to move to a position f of the winding portion B so that the end member 202 Upper lowers to the initial winding position. 0 La- > Figures 7 to 7E and Figures 8A to 8E show the steps of performing a Leakage Magnetic Field Protection (VLF) coil, respectively, In Figures 7A to 7E, the upper end member 202 of the nozzle unit 2 1 joins the wire material W 5 around a pin of the winding web VLF, that is, the upper end member 202 of the nozzle unit 201 passes around the pin 2 to wind several times the Wire material W. In this case, as shown in Figure 7E, the upper end member 202 projecting hori- zontally from the nozzle unit 201 can approach the pin and go around the pin in such a manner that it is possible to prevent the nozzle unit 201 from advancing against the hooking strip 21c which itself forms the outer periphery of the workpiece K.

Further, in Figures 8A to 8E, the manner in which the upper end member 202 of the nozzle unit 201 performs a magnetic field shielding coil winding operation around a winding portion B VLF is shown. In Figure 8A, the wire material W having an end already wound around the pin of Figure 7A is positioned at the end of the winding part B and in Figure 8B, the nozzle unit 201 is lowered in the direction of Z2 in such a manner that the wire material W is wound on the first side of the winding part B. Then, as shown in Figure 8C, the nozzle unit 201 rotates 90ß and moves relative to the workpiece such that the wire material W is wind along the groove on the second side of the winding part. - In Figure 8D, the nozzle unit 201 moves up in the direction Zl in such a way that the wire material W is wound around the third side of the part B of winding. Finally, in Figure 8E, the wire material W is wound around the fourth side of the winding part B by the rotation of the workpiece K.

A * Accordingly, by repeating the operations in Figures 8A to 8E, the wire material W is wound a predetermined number of times. In the aforementioned house, it is noted that, as shown in Fig. 8E, when the wire material W is wound with only around the winding part B, since the upper end member 202 is elongated to form the winding portion B. ejected in the horizontal direction, the nozzle unit 201 does not advance against the engagement strip 21c 1. 0 e the foot. "A > J work." L .- »unit and nozzle 201 makes it possible for the upper member 2 2 to be joined and then to unwrap the wire material W around the pin and the winding portion B without advancing against the projection part of the piece of work. As described above, as shown in Figures 6A to 6H, 7A to 7E and 8A to 8E, by using a type of nozzle, ie, the nozzle unit 201 having the upper end member 202, the operation of winding horizontal deflection coil (what is known as a main winding), the winding operation of wire material relative to the pin of FIGS. 7A to 7E and the leakage magnetic field protection coil operation shown in FIG. Figures 8A to 8E can performed efficiently without causing any problems in y1 **. relationship with the advance against the work piece K of the nozzle unit 201. By repeating the above operations a predetermined number of times, the winding of the magnetic field leakage protection coil (VLF) is applied to the B portion of winding as shown in figure 2, thus ending the winding operation for the magnetic field leakage protection coil (VLF). As described above, in the present embodiment, the winding of the leakage magnetic field protection coil (VLF) is made possible by the addition of the upper end member 202 to the nozzle unit 201 and the winding of the VLF coil can be effected continuously from the winding of the coil deviation. In this case, the piece The work can be maintained vertically by the blocking support 70 or as shown in FIG. 2. It is therefore possible to carry out the operations of winding of the deflection coil and VLF coil in a short time and in a stabilized manner. greatly improves the production efficiency of the deflection yoke. In accordance with the present embodiment, it is possible to wind the deflection yoke coil and the VLF coil efficiently and unlike the conventional method in which the two deflection coil winding operations and VLF coils are made by means of several windings, only these different winding operations can be carried out by means of a single device. In addition, as shown in Figure 2, by providing the guide member 203 with excellent abrasion resistance on the upper end portion of the nozzle unit 201, it is possible to minimize the amount of abrasion of the exfoliation member 202. The result is that the life of the nozzle unit 201 can be extended. However, the present expiration does not refer to the above-described embodiment. the above described modality, the protection coil winding operation cié leakage magnetic field is performed after the completion of the horizontal deflection coil winding but it is It is obviously possible to reverse the order in which the winding operations are carried out. In addition, in Figure 9, an example of another embodiment of the present invention is shown. As is evident from the comparison with the modality of Figure 1, the winder shown in Figures 6A to 6H is equipped with two sets of upper guide units 301 and lower guide units 302 that are provided on the pole 18 of the guide unit carrier 14. The paste 30 of the nozzle unit carrier 16 is equipped with the nozzle unit holder 431. The "nozzle unit holder 431 is equipped with two nozzle units 201. Consequently, unlike the embodiment of FIG. 1, by supplying the two nozzle units 201 and two joint units 301 and 301 of upper and lower guides, it is possible to perform winding operations simultaneously in two pieces of braid jo K, The remaining points of the modality of Figure 9 are similar to those of the modality of the figure J ^ * ^ in such a way that the description of the 1. 0 same. In accordance with the present invention, it is possible to wind a wire material in different directions while the workpiece, like a deflection yoke, maintains its. guidance in a certain state. , "* ' twenty

Claims (5)

1. z ^ '-. CLAIMS 1. A winder for winding a wire material from a source of wire material around a work piece, said apparatus comprises: 5 a first winding device comprising a nozzle unit for feeding wire material coming from the source of wire material to the workpiece and a guiding unit and operating from "" * "such way that the wire material from the unit
2. The nozzle 10 is wound around a joining portion of the workpiece and moved in a three-dimensional direction by the cooperation of the guide unit with the nipple of the nozzle unit, to thereby form a first winding on the workpiece. of work; and a second winding device for forming on the workpiece a second winding different from the first winding by moving the nozzle unit in directions parallel and normal to the axis of the workpiece. 2. A winder according to claim 1, wherein the upper end of said nozzle unit through which the wire material is introduced projects substantially outwardly in the form of an L and has a suitable size for allow its passage along each part of the work piece. "? 7
3. 3. A winder according to claim 1, wherein said first winding is a deflection yoke of a deflection yoke for use with a yoke of cathode rays.
4. 4. A winding method for winding a wire material that comes from a wire material supply source around a work piece, said method being characterized in that a first winding is formed on the work piece in such a way that the Wire material that comes from the wire material supply source is fed to the work piece by means of a nozzle unit and after being wound around a joint of the work piece, it is moved in directions It is imensed through a guide unit which cooperates with the movement of the nozzle unit, and a second winding different from the first winding is formed on the work piece by movement of the nozzle unit in parallel and normal directions to the axis of the work piece.
5. 5. A winding for winding a wire material coming from a source of material supply, said method being characterized in that a second winding is formed on the work piece by the displacement of a nozzle unit, through which The wire material is fed to a work piece, in parallel directions and normal to the axis of a first winding different from the second winding is formed on the work piece in such a way that the wire material coming from the nozzle unit is it moves in three-dimensional directions after which it is joined around a joining portion of the workpiece, by the nozzle unit and a guide unit which cooperates with the movement of the nozzle unit.