Winding wire around deflection yokes

Abstract: A winding apparatus comprises: a nozzle for supplying a wire to be wound around a deflection yoke; and at least two guide means, each for guiding the wire to a position where each winding wire is engaged with the deflection yoke for approximately the same height. Each of the guide means is preferably capable of being reversed by 180°. Further, the guide means preferably have a common base and are movable crosswise by one drive means. Additionally, the winding apparatus preferably includes a drive means for operating the nozzle in the vertical direction. With this construction, it is possible to shorten the time required for winding operation, and to reduce the production cost for the deflection yoke.

Description: This invention relates to winding wire around deflection yokes, for example a deflection yoke for mounting on a cathode-ray tube such as a Braun tube. Conventionally, along with demands toward high quality image and high fineness in television receivers, integral and undivided deflection yokes have been used in Braun tubes. This integral type deflection yoke has such a construction as shown in Fig. 11. An integral type deflection yoke 1 is formed in a funnel or horn shape, and has an opening portion side 1a and a neck side 1b. When the deflection yoke 1 is mounted on a Braun tube, the opening portion side 1a is disposed on a fluorescent screen side of the Braun tube, while the neck side 1b is disposed on an electron gun side of the Braun tube. The opening portion side 1a includes a plurality of sections 1c, a plurality of winding grooves 1d, and one opening portion side circumferential groove 1e. Similarly, the neck side 1b includes a plurality of sections 1f, a plurality of winding grooves 1g and one neck side circumferential groove 1h. As shown in Figs. 12 and 13, the winding of a wire is performed for the deflection yoke 1 having the above construction in the following manner: Namely, the wire passes from the opening portion side circumferential groove 1e through the winding grooves 1d and 1g by way of the section 1c. After that, the wire passes through the neck side circumferential groove 1h by way of the section 1f. Further, the wire passes through the winding grooves 1g and 1d by way of the section 1f. Finally, the wire passes so as to be returned to the above opening portion side circumferential groove 1e by way of the section 1c. In winding a wire around a winding portion of the deflection yoke 1, there may be considered such a winding apparatus as shown in Fig. 14. On a base unit 2a, a winding apparatus 2 has a pair of nozzle units 3 and 3, a pair of guide units 4 and 4, and one holder unit 5 and a pair of tensioner units 6 and 6. Of these units, a pair of the nozzle units 3 and 3, a pair of the guide units 4 and 4 and a pair of the tensioner units 6 and 6 are disposed so as to be symmetric and to be similar to each other, respectively. Hereinafter, only the nozzle unit 3, the guide unit 4 and the tensioner unit 6 on the left side of Fig. 14 will be described. The above nozzle unit 3 includes a nozzle 3a, a nozzle turning unit 3b and an XZ feed unit 3c, and thereby it can moved in the X and Z axis directions as a whole, and also the nozzle 3a is turnable by a specified angle. In addition, the nozzle 3a is intended to feed a wire W supplied from the tensioner unit 6 through the leading edge thereof. The guide unit 4 includes a guide operating part 4a, a reversing unit 4b and an XZ feed unit 4c, and thereby it can be moved in the X and Z axis directions as a whole and reversed by 180° by the reversing unit 4b. The guide operating part 4a includes a guide claw 4d. The guide claw 4d has an L-shaped leading edge and is turnable and openable. The tensioner 6 is mounted on a frame as shown in Fig. 14, and is intended to supply the wire from a supply source (not shown) to the nozzle unit 3 with a mechanically suitable tension. The holder unit 5 has a holder main body 5a and a clamp opening/closing device 5b for holding the deflection yoke 1 as shown in Fig. 11, and which can index the turning angle. Thus, the deflection yoke 1 is mounted on the holder main body 5a and is supported so as to be turnable by a specified angle. The winding of the wire is performed for the deflection yoke 1 using the winding apparatus 2 having the above construction in such a manner as shown in Figs. 15 to 32. First, as shown in Fig. 15, a pair of the nozzles 3a and 3a are descended in the deflection yoke 1, and two wires W are bound and fixed to two sections 1f and 1f on the neck side 1b. At this time, a pair of the guide claws 4d and 4d are horizontally positioned on the sides of the opening portion 1a. Next, as shown in Figs. 16 and 17, as the deflection yoke 1 is turned while a pair of nozzles 3a and 3a are ascended, the wires are supplied from the nozzles 3a and 3a along the winding grooves 1d and 1d. In addition, Fig. 17 briefly shows only one nozzle 3a. As shown in Figs. 18 and 19, when the nozzles 3a and 3a are moved to positions higher than the opening portion 1a of the deflection yoke 1, they are stopped at the positions and are each turned by plus 180°. Then, the guide claws 4d and 4d advance in the open states and are closed to catch the wires W. Thus, the wires W are moved to the positions corresponding to the opening side circumferential groove 1e. Subsequently, the deflection yoke 1 is turned, and is stopped at the sections 1c and 1c to be wound with the wires. At this time, as shown in Figs. 20 and 21, the guide claws 4d and 4d advance so as to correspond to the positions of the opening side circumferential groove 1e, and enter within the opening side circumferential side groove 1e. The nozzles 3a and 3a are then moved to the inner side of the deflection yoke 1 and are turned by minus 180°, to be thus returned to the original positions. Then, by opening of the guide claws 4d and 4d, the wires W are wound around the target sections 1c and 1c. Next, as shown in Figs. 22 and 23, the nozzles 3a and 3a are descended while supplying the wires W. Synchronously with the descending of the nozzles 3a and 3a, the deflection yoke 1 is turned. Accordingly, the nozzles 3a and 3a are descended along the arbitrary winding grooves 1d and 1d. On the other hand, the guide claws 4d and 4d are started to be moved directly after the above opening motion. Thus, when reaching the positions as shown in Fig. 24, the guide claws 4d and 4d wires W and guide them. By repeating of the operational procedure of one cycle described above, the winding of the wires W are performed for the deflection yoke 1. In the winding apparatus having the above construction, however, the opening portion side 1a and the neck side 1b of the deflection yoke 1 are relatively apart from each other in the vertical direction. Since the guide claw 4d is intended to be suitably moved in the vertical direction for winding operation in the directions of the opening portion side 1a and the neck side 1b, the time required for the movement of the guide claw 4d becomes longer, which takes a longer time for the winding operation. Accordingly, the production of the deflection yoke for unit time is reduced. This causes a disadvantage in increasing the cost of the deflection yoke, resulting in the increased cost of the Braun tube or the television receiver. Prior art winding apparatus is disclosed in EP-A-0 582 409, EP-A-0 461 562 and IBM Technical Disclosure Bulletin, Vol. 33, No. 9 (February 1991), pp 165-166. EP-A-0 582 409 is a copending application published after the present application's priority date and having some subject matter entitled to an earlier priority date than that of the present application. This invention provides a winding apparatus for a deflection yoke, comprising; a base; a nozzle for supplying a wire to be wound around said deflection yoke; a tensioner for supplying said wire to said nozzle; a holder for holding said deflection yoke; and at least two guide means each capable of guiding said wire to a position where each winding is engaged with said deflection yoke, at approximately the same height for each winding, characterised in that said at least two guide means have a common base, and are movable by the same drive means. This invention also provides a winding method for a deflection yoke comprising the steps of: holding said deflection yoke by a holder; supplying a wire from a tensioner to a nozzle; and winding said wire supplied from said nozzle around a portion to be wound with said wire while guiding said wire by guide means, wherein said wire is guided by one of at least two guide means to a position where each winding is engaged with said deflection yoke, at approximately the same height for each winding; characterised in that said at least two guide means have a common base, and are movable by the same drive means. According to the above construction, in the case where the portions to be wound with wires, for example an opening portion side and a neck side of the deflection yoke, are vertically apart from each other, since one guide means is provided for each portion to be wound with the wire, the winding operation is performed for one portion to be wound with the wire while the wire is guided by the guide means provided for the portion to be wound with the wire; and the winding operation is performed for the other portion to be wound with the wire while the wire is guided by the next guide means without the above guide means. Further, in the case where each of the above guide means has a function capable of being reversed by each 180°, two kinds of winding operations, normal winding and reversed winding, can be continuously performed by use of the same guide means. Consequently, since the movement of the guide means is eliminated when the winding is shifted from one portion to be wound with the wire to another portion to be wound with the wire in the continuous winding operation, it is possible to shorten the winding time. This makes it possible to increase the production of the deflection yoke resulting in the reduced production cost of the deflection yoke, and hence to reduce the cost of the Braun tube and the television receiver. Further, in the case where each of the above guide means has a function capable of being reversed by each 180°, it is possible to continuously perform two kinds of winding operations, that is, normal winding and reversed winding, and hence to more effectively perform the winding operation. An embodiment of the invention described below provides a method of and an apparatus for winding a wire around a deflection yoke, which is capable of shortening the time required for winding operation, and of reducing the production cost of the deflection yoke. The invention will now be further described, by way of illustrative and non-limiting example, with reference to the accompanying drawings, in which: Fig. 1 is a schematic perspective view showing one embodiment of a winding apparatus according to the present invention; Fig. 2 is a schematic perspective view showing a guide unit of the winding apparatus in Fig. 1; Fig. 3 is a partially enlarged perspective view showing the vicinity of the leading edge of a guide claw of the guide unit of Fig. 2; Fig. 4 is a schematic perspective view of an XZ feed unit of the guide unit in the winding apparatus of Fig. 1; Fig. 5 is a sectional view showing the state of starting the winding of the wire in the apparatus embodying the invention; Fig. 6 is a sectional view showing the state where the wire is wound around an opening side circumferential groove of the deflection yoke; Fig. 7 is a sectional view showing the state where the wire is wound around a certain section; Fig. 8 is a sectional view showing the state where the wire is caught by a guide claw on the neck side; Fig. 9 is a sectional view showing the state where the wire is introduced to the position corresponding to the neck side circumferential groove by the guide claw on the neck side; Fig. 10 is a sectional view showing the state where the wire enters in the neck side circumferential groove by the guide claw on the neck side; Fig. 11 is a perspective view showing a construction of an integral deflection yoke; Fig. 12 is a sectional view showing a construction of an integral deflection yoke; Fig. 13 is a schematic view showing one example of a winding shape of a wire; Fig. 14 is a schematic perspective view showing one example of a winding apparatus for a deflection yoke different from the apparatus embodying the invention; Fig. 15 is a view showing the state of starting the winding of the wires by the winding apparatus of Fig. 8; Fig. 16 is a bottom view showing the state where the wire is guided in the deflection yoke; Fig. 17 is a sectional view showing the state where the wire is guided in the deflection yoke; Fig. 18 is a bottom view showing the state where the wires are wound around the opening side circumferential groove of the deflection yoke; Fig. 19 is a sectional view showing the state where the wires are wound around the opening side circumferential groove of the deflection yoke; Fig. 20 is a bottom view showing the state where the wires are wound around certain sections; Fig. 21 is a sectional view showing the state where the wires are wound around the certain sections; Fig. 22 is a bottom view showing the state where the wires are wound around the opening side circumferential groove and are introduced on the neck side by way of winding grooves; Fig. 23 is a sectional view showing the state where the wires are wound around the opening side circumferential groove and are introduced on the neck side by way of the winding grooves; Fig. 24 is a sectional view showing the state where the wires are caught by guide claws on the neck side; Fig. 25 is a sectional view showing the state where the wires are introduced to the positions corresponding to the neck side circumferential groove by the guide claws on the neck side; Fig. 26 is a bottom view showing the state where the wires are introduced to the positions corresponding to the neck side circumferential groove by the guide claws on the neck side; Fig. 27 is a sectional view showing the state where the wire is further drawn at the position corresponding to the neck side circumferential groove by the guide claw on the neck side; Fig. 28 is a bottom view showing the state where the wire is further drawn at the position corresponding to the neck side circumferential groove by the guide claw on the neck side; Fig. 29 is a sectional view showing the state where the wires enter in the neck side circumferential groove by the guide claws on the neck side; Fig. 30 is a bottom view showing the state where the wires enter in the neck side circumferential groove by the guide claws on the neck side; Fig. 31 is a sectional view showing the state where the nozzles for the wires are held on the neck side; and Fig. 32 is a sectional view showing the state where the nozzles for the wires are ascended on the opening portion side and are shifted to the next winding cycle. Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to Figs. 1 to 10. Fig. 1 shows one embodiment of a winding apparatus for a deflection yoke. On a base unit 11, a winding apparatus 10 has one nozzle unit 12, a guide unit 13 with two guides, one holder unit 14 and three tensioner units 15. The above nozzle unit 12, similarly to the winding apparatus as shown in Fig. 14, includes a nozzle 12a, a nozzle turning unit 12b and an XZ feed unit 12c, and thereby it can be moved in the X and Z axis directions as a whole, and also the nozzle 12a is turnable by a specified angle. In addition, the nozzle 12a is intended to feed the wire W supplied from the tensioner unit 15 through the leading edge thereof. The guide unit 13 includes a pair of guide operating parts 20 and 21, a pair of reversing units 22 and 23 and one XZ feed unit 25. Fig. 2 shows the guide operating parts 20 and 21 and the reversing units 22 and 23 of the guide unit 13. The guide operating units 20 and 21 have the guide claws 20a and 21a, operating/closing cylinders 20b and 21b, and bases 20c and 21c, respectively. The rear portions of the bases 20c and 21c are respectively connected to the rear portions of the opening/closing cylinders 20b and 21b by means of pins 20d and 21d. The front portions of the bases 20c and 21C are respectively connected to the guide claws 20a and 21a by means of pins 20e and 21e. In addition, the shafts of the opening/closing cylinders 20b and 21b are respectively connected to the guide claws 20a and 21a by means of pins 20f and 21f. With this arrangement, when the shafts of the opening/closing cylinders 20b and 21b are retreated, the guide claws 20a and 21a are turned around the pins 20e and 21e, to be thereby opened, respectively. On the other hand, when the shafts of the opening/closing cylinders 20b and 21b advance, the guide claws 20a and 21a are turned around the pins 20e and 21e, to be thereby closed, respectively. In addition, preferably, the guide claws 20a and 21a have L-shaped leading edges, respectively, as shown in Fig. 3. The reversing units 22 and 23 include reversing bases 22a and 23a, bearing housings 22b and 23b, reversing shafts 22c and 23c, couplings 22d and 23d, rotary actuators 22e and 23e and a slide base 22f. When the rotary actuators 22e and 23e are turned by 180° by air pressure, the reversing shafts 22c and 23c and the reversing bases 22a and 23a connected to each other by means of the couplings 22d and 23d are turned by 180°, and the guide claws 20a and 21a are respectively reversed together with the above bases 20c and 21c. Further, as shown in Fig. 4, the XZ feed unit 25 includes an AC servo-motors 25a and 25b, ball screw driven slide units 25c and 25d. By turning of the above AC servo-motors 25a and 25b, the slide base 22f is moved in the longitudinal and vertical directions. Here, since the above AC servo-motors 25a and 25b are turned by the number of the supplied pulses, by control of the number of the pulses, the slide units 25c and 25d can be moved to the suitable positions. Further, the tensioner unit 15 is mounted to a frame 16 as shown in Fig. 1, which is intended to supply the wire W from a wire reel 17 to the nozzle unit 12 with a mechanically suitable tension by way of a paraffin coating unit 18. In addition, the holder unit 14 has a holder main body 14a and a clamp opening/closing device 14b, which is intended to hold the deflection yoke by the holder main body 14a and clamp the deflection yoke by closing of the clamp opening/closing device 14b. The winding apparatus 10 in this embodiment is so constructed as described, and in winding the wire W around the deflection yoke as shown in Fig. 11, the winding operation is performed in such a manner as shown in Figs. 5 to 10. First, as shown in Fig. 5, the nozzle 12a is descended in the deflection yoke 1, and the wire W is bound and fixed to the section 1f on the neck side. Next, as the deflection yoke 1 is rotated while the nozzles 12a is ascended, the wire W is supplied along the winding groove 1d. Further, the wire W is caught by the guide 20a, and is wound around the opening side circumferential groove 1e by turning of the deflection yoke 1 (see Fig. 6). As shown in Fig. 6, when the nozzle 12a is moved to the position higher than the opening portion 1a of the deflection yoke 1, it is stopped and is turned by 180°. Then, the guide claw 20a advances in the open state, and is closed to catch the wire W. Thus, the wire W is moved to the position corresponding to the opening portion side circumferential groove 1e. Next, the deflection yoke 1 is turned, and is stopped at the position of the section 1c to be wound with the wire. At this time, as shown in Fig. 7, the guide claw 20a advances so as to correspond to the position of the opening portion circumferential groove 1e, and enters within the opening portion side circumferential groove 1e. Subsequently, the nozzle 12a is moved to the inside of the deflection yoke 1 and is turned by minus 180°, to be thus returned to the original position. Then, by opening of the guide claw 20a, the winding of the wire W is performed for the target section 1c. Next, as shown in Fig. 8, the nozzle 12 is descended while supplying the wire W. Synchronously with the descending of the nozzle 12a, the deflection yoke 1 is turned. Thus, the nozzle 12a is descended along an arbitrary winding groove 1d. When the nozzle 12a is descended along the winding groove 1d and reaches the minimum point, the guide claw 21a advances and is closed to catch the wire W. In such a state, the guide claw 20a is retreated and ascended, and as shown in Fig. 9, when reaching the position of the neck side circumferential groove 1h, it is stopped. In such a state, the deflection yoke 1 is turned, and the wire W is wound around the neck side circumferential groove 1h. The turning of the deflection yoke 1 is stopped at the target section 1f (see Fig. 9). At this time, as shown in Fig. 10, the guide claw 21a advances while being in the position of the neck side circumferential groove 1h, and enters in the inside of the neck side circumferential groove 1h. Then, by opening of the guide claw 21a, the winding of the wire W is performed for the target section 1f. After that, the guide claw 21a is retreated and descended, and further reversed. Further, the nozzle 12a is again ascended. By repeating the operational procedure of one cycle described above, the wire W is wound around the deflection yoke 1. In addition, in the above embodiment, the opening cylinders and the rotary actuators are used for opening/closing and reversing the guide claws 20a and 21a; however, the opening/closing and reversing means are not limited thereto, for example, the other driving method such as a cam mechanism may be used. Further, in the above embodiment, the ball-screw mechanism is used for the XZ feed unit; however, the driving is possible by the other driving method such as a cylinder, cam and the like.

Claims: A winding apparatus for a deflection yoke, comprising; a base (11); a nozzle (12) for supplying a wire to be wound around said deflection yoke; a tensioner (15) for supplying said wire to said nozzle; a holder (14) for holding said deflection yoke; and at least two guide means (20, 21), each capable of guiding said wire to a position where each winding is engaged with said deflection yoke, at approximately the same height for each winding, characterised in that said at least two guide means (20, 21) have a common base (22f), and are movable by the same drive means (25). A winding apparatus according to claim 1, wherein each of said guide means (20, 21) is capable of being moved in forward and reverse directions. A winding apparatus according to claim 1, which includes a drive means for operating said nozzle in the vertical direction. A winding method for a deflection yoke comprising the steps of: holding said deflection yoke by a holder (14); supplying a wire from a tensioner (15) to a nozzle; and winding said wire supplied from said nozzle around a portion to be wound with said wire while guiding said wire by guide means (20, 21), wherein said wire is guided by one of at least two guide means (20, 21) to a position where each winding is engaged with said deflection yoke, at approximately the same height for each winding; characterised in that said at least two guide means (20, 21) have a common base (22f), and are movable by the same drive means (25). A winding method according to claim 4, wherein said wire is guided by each of said guide means (20, 21) capable of being moved in forward and reverse directions. A winding method according to claim 4, wherein said wire is supplied from said nozzle which is vertically movable.

Inventors: WATANABE YASUHIRO, WATANABE, YASUHIRO, WATANABE, YASUHIRO, C/O INTELLECTUAL PROPERTY DIV.
Applicants: SONY CORP, SONY CORPORATION
Application year: 1993
Main classification: H01F41
IPC codes: H01J9, B65H54