JPH02172211A - Manufacture of switching transformer - Google Patents

Abstract

PURPOSE:To wind a wire and an insulating sheet easily by a method wherein the insulating sheet having a specific shape is wound on the frame of a bobbin having flanges on both its ends to form an insulating layer having steps on both its ends and a required length of the wire is wound on the frame between the steps and then a required quantity of an insulating sheet is applied to form one winding layer. CONSTITUTION:A bobbin 1 has flanges 3 and 4 and a plurality of terminals 5 protrude from one of the flanges 3 and 4. An insulating sheet 30 has a constant width from its winding start end to a certain length and, after that, its center part is cut off to leave both the side edge parts 30a only. Such insulating sheet 30 is wound on the frame of the bobbin 1 to form an insulating layer having steps 30A and 30B on both its ends. After a wire 20 is entwined the terminal 5, a required length of the wire 20 is wound on the frame 2 between the steps 30A and 30B. Then the wire 20 is laid on the insulating sheet 30 so as to be folded toward the predetermined terminal and entwined the terminal 5. Then a required quantity of an insulating sheet 30 is applied so as to cover the wire 20 to form one winding layer. With this constitution, the wire and the insulating sheet can be applied easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a switching transformer used in electronic equipment, communication equipment, etc.

(Prior Art) First of all, a switching transformer used in electronic equipment, communication equipment, etc. has wire rods 10, insulating sheets 11, etc. wound alternately around a bobbin 1, as shown in FIGS. 6 and 7. As shown in FIG. 3, the bobbin 1 has a shape in which crocodiles 3.4 are formed at both ends of the body 2, and a plurality of terminals 5 are protruded from one collar 3. . The switching transformer is formed in the order shown in FIG.
In order to understand the structure, it is shown as a cross-sectional perspective view in a state r3 with the collar 3 removed. First, an adhesive is applied to the body part 2, and an insulating sheet 11 of approximately the same width as the body part 2 is wrapped a predetermined number of times, and then an insulating sheet 12 of a predetermined width is wrapped around both ends of the body part 2, and the insulating sheet 11 is wrapped around the body part 2 at both ends. forming parts 12A and 12B (8th-
Figure 1) 0 Next, when the wire 10 is tied around the predetermined terminal 5,
The body part 2 is placed so that the end surface of the ridge part 12A is at the winding start position.
(Fig. 8-2), and then wrap the wire rod 10 around the body 2
The wire rod 10 is wound along the longitudinal direction of the trunk section 2 until it is wound up to the position of the other ridge 12B (Fig. 8-3), and an adhesive is applied onto the wire rod 10 wound around the body section 2. A predetermined amount of insulating sheet 11 is wrapped between the body part 2 and the width of the track. Next, the wire rod 10 is bent and wired along the insulating sheet 11 toward the terminal 5 (Fig. 8-4).
is wrapped around the terminal 5, the insulating sheet 11 is again wrapped by a predetermined amount over the folded wire 10 toward the terminal (8th
-5), the first winding layer is formed by the above-mentioned operations. By repeating this operation, a switching transformer having a plurality of winding layers as shown in FIGS. 6 and 7 is formed.

(Problems with the prior art) In order to form a switching transformer as described above, it is necessary to wrap a wide insulating sheet, wrap a narrow insulating sheet,
Operations such as wrapping the wire around the terminal, wrapping it around the body, wrapping a wide insulating sheet, folding the wire, wrapping it around the terminal, and wrapping the wide insulating sheet must be performed. , it is difficult to mechanize because the operation process is complicated.

Also, when wrapping a narrow insulation sheet, unnecessary tension/
Even the slightest influence of noise can cause the insulation sheet to break or become twisted. Therefore, there are problems in that the winding is very difficult to operate and only rigid insulating sheets can be used.

(Objective) The object of the present invention is to enable the winding of a wire rod and the winding of an insulating sheet to be easily and reliably performed.

(Means for Solving the Problems) In order to achieve the above object, the switching transformer of the present invention has flanges formed at both ends of the body, and a plurality of terminals protruding from one of the flanges. An insulating sheet is wrapped around the body of the bobbin with a constant width from the winding start end to a certain length, and then the central part is cut off, leaving only both ends, so that an insulating layer is formed to form ridges at both ends. First, after winding the wire around the terminal, the wire is wound around the body located between the ridges, and during the final winding of the wire, another insulating sheet is supplied, and the final winding is finished with the wire. The wire is then wrapped around the body by a predetermined amount while being pressed against the body, and then the wire is wired so as to be folded over the insulating sheet toward a predetermined terminal and tied around the terminal, and the insulating sheet is further wrapped around the wire so as to cover the wire. A predetermined amount of wire is wound to form one winding layer, and a plurality of winding layers are laminated on the winding layer using the method described above to form a winding portion.

(Example) Configuration of the switching transformer of the present invention and its formation 1
The 'lJt order will be explained based on the drawings.

The configuration of the switching transformer of the present invention is as shown in FIGS. 1 and 2, using the same bobbin 1 as the conventional one shown in FIG. 3, and formed in the order shown in FIG. 4. The drawing is shown as a cross-sectional oblique view with the collar 3 removed to make the structure easier to understand. That is, first, an adhesive is applied to the circumferential surface of the body 2 of the bobbin 1, and the body 2 is
When an insulating sheet 30 such as insulating paper or synthetic resin film having a width of and - is attached and wound a predetermined number of times,
As shown in FIG. 5, the central part of the insulating sheet 30 is cut off so that only both ends 30a in the width direction remain, and the insulating sheet 30a is rolled up until it reaches the diameter of the wire 20 and the thickness of the gap. The attached portions form ridges 30A and 30B (Fig. 4-1). Next, when the wire rod 20 is tied around a predetermined terminal 5, the ridge portion 30A
Roll 1 inch so that the end of the roll is at the starting position (4th
-21171), the wire rod 20 is wound along the longitudinal direction of the body part 2, and in the middle of the final winding of the wire rod 20, an insulating sheet 30 having a width of - between the body part 2 and the path is supplied, and the final winding is performed. can be wound a predetermined amount by the wire 20 while being pressed against the trunk 2 (Fig. 4-3), and when the wire 20 reaches the winding end position along the end surface of the ridge 30B, the wire 20 is bent and the above-mentioned operation is performed. Wiring is carried out toward the terminal side along the top of the insulating sheet 30 which has been wound 1/1 (Fig. 4-4). Then, when the wire 20 is tied around the terminal, a predetermined amount of insulating sheet 30 is successively wrapped over the folded wire 20 (FIGS. 4-5). This operation forms the first winding layer.

By repeating the above-described operations, a switching transformer having a plurality of winding layers as shown in FIGS. 1 and 2 can be formed.

(Effects of the Invention) In the method for manufacturing a switching transformer of the present invention, flanges are formed at both ends of the body, and a plurality of terminals are protruded from one of the flanges. From then on to a certain length, the insulating sheet is wrapped with a constant width, then the central part is cut off, leaving only both ends, and an insulating layer is provided so as to form ridges on both ends.First, the wire is attached to a terminal. After twining, the wire is wound around the trunk located between the ridges, and the wire is wrapped around the body. & In the middle of the final winding, another insulating sheet is supplied, and the final winding is wrapped by a predetermined amount while pressing the wire against the trunk, and then the wire is wired so as to be folded over the insulating sheet toward a predetermined terminal. At the same time, the insulating sheet is further wound around the wire by a predetermined amount to cover the wire to form one winding layer, and a plurality of winding layers are formed on the winding layer by the method described above. Since the wires are laminated to form the winding part, it takes a few steps to wrap the insulating sheet around the body and wrap the insulating sheet to form the insulating layer. The operation of winding the insulating sheet on the wire that has been folded back toward the terminal side and the operation of winding the insulating sheet on the wire that has been folded back toward the terminal side can be performed continuously, which facilitates mechanization and improves productivity. can be improved.

In addition, an insulating sheet is wrapped around the body of the bobbin to form an insulating layer. The insulating sheet will not be cut even if it is wound with a tension of
It is possible to use an insulating sheet such as insulating paper or synthetic resin film, which can be wrapped reliably and has low rigidity.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the switching transformer of the present invention, and FIG. 2 is a view taken along the Z arrow in FIG. FIG. 3 is a schematic diagram showing one embodiment of a bobbin used to form a switching transformer. FIG. 4 is a schematic diagram showing the order of forming the switching transformer of the present invention. FIG. 5 is a schematic diagram showing one embodiment of an insulating sheet used in the present invention. FIG. 6 is a schematic sectional view showing one embodiment of a conventional switching transformer, and FIG. 7 is a view taken along the Y arrow in FIG. FIG. 8 is a schematic diagram showing the order of forming a conventional switching transformer. 1: Bobbin, 2: Body, 3.4: Tsuba, 5: T4I, 10.20: Wire rod, 11.12, 13.30: Insulating sheet, Figure 1 Figure 2 Applicant: Toray Engineering Co., Ltd. Figure 3 Figure 5 Figure 6 z+'1 Figure 7 Figure 4 0A Figure 8 2A

Claims (1)

[Claims] 1) The body of the bobbin has flanges formed at both ends of the body and a plurality of terminals protruding from one of the flanges. An insulating layer is provided by wrapping an insulating sheet with only both ends left intact to form ridges at both ends. First, the wire is tied around the terminal, and then the wire is wrapped around the body located between the ridges. is wound, and during the final winding of the wire, another insulating sheet is supplied, and the final wrapped wire is pressed against the body while wrapping the wire by a predetermined amount, and then the wire is wrapped around the insulating sheet to a predetermined terminal. At the same time, the insulating sheet is further wrapped around the wire by a predetermined amount to cover the wire material to form one winding layer, and the wire is wrapped by the method described above on the winding layer. A method of manufacturing a switching transformer, comprising laminating a plurality of winding layers to form a winding portion.