JPH0261128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing jig for an annular coil suitable for application to, for example, a coil for a rotating transformer of a video tape recorder.

Conventionally, this type of toroidal coil has been manufactured mostly by mechanical winding using automatic machines because mass production is required. However, manufacturing a specially shaped toroidal coil by hand may be more efficient than by machine winding. A coil 1 for a so-called VTR rotary transformer is often formed into a spiral shape with several turns, with the coil end 2 bent upward or downward, as shown in FIG. 1, for example. In this case, coil 1
Since the material is made of copper or other metal, it is rigid in itself. As a result, it has a tendency to spread outward more than a helical coil.
Therefore, when inserting into the rotating transformer core,
Since the outer diameter d of the coil 1 has increased, it is necessary to readjust the coil 1 before fitting it into the coil 1, which has the drawback of very poor workability. There is also a risk that the coil 1 shown in FIG. 1 may be deformed during transportation to other processes.

In view of these points, the present invention proposes a manufacturing jig that eliminates the drawbacks of wire rods being multi-layered or not having a predetermined diameter during coil manufacturing, and capable of reliably winding a coil into a single layer with a predetermined diameter. The main purpose is to

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIGS. 2 to 4 are explanatory diagrams of a coil manufacturing process showing an example using the jig of the present invention. First, the second
As shown in the figure, the coil materials 5 are arranged on jigs 6 and 7 for determining their dimensions. The jig 6 is a plate with pins 8 implanted at both ends, and the jig 7 is a plate in which a plurality of grooves 9 corresponding to the wire diameter of the coil material 5 are formed. Then, after placing the jig 7 on top of the jig 6 and hooking the coil material 5 on the pin 8, the coil material 5 is
cut. The length l of the jig 7 is set in advance to match the required length of the coil to be completed. After that, solder is applied to both ends 5a and 5b of the cut coil material 5, and as shown in FIG. One end 5a is bent to form the bent shape shown. Incidentally, the surface of the coil material 5 is coated with a fusing agent that melts and sticks when permeated with an acetone solution, for example.

Next, it is spirally wound using a jig 10 shown in FIG. This manufacturing jig 10 is a moving jig 11 in which a first annular groove 11a matching the desired coil inner diameter is formed.
and a fixing jig 12 that fits into the moving jig 11, and the moving jig 11 further includes a second hole bored in the width direction to sandwich the coil end, in other words, in the center direction.
It has a groove 11b. 11c is a fitting protrusion;
Reference numeral 12a indicates a fitting hole.

First, the end 5a bent into an L shape is inserted into the second groove 11.
b, hold the other end 5b, and manually tighten the groove 11.
Wind it in a spiral around a. Of course, the widths of the grooves 11a and 11b are made to match the wire diameter of the coil material 5. After making the necessary windings, the other end of the coil 5
b between the second grooves 11b and bent into an L shape.
The coil wound through the above steps has a shape as shown in FIG. 4, but at that time, a melting agent such as acetone can be penetrated into the coil 5c and the end portion 5d, and both ends can be twisted. can. Since the melting agent is applied to the surface of the coil 5 as described above, the molded shape of the coil 5 shown in FIG. 4 is fixed. After that, moving jig 1
1 in the direction of arrow A, and the completed coil 5
is removed from the moving jig 11 to finish manufacturing.

As described above, according to the present invention, there is provided a moving jig in which a first annular groove having a semicircular cross section that matches the inner diameter and wire diameter of a circular coil is formed on the side surface, and a fitting protrusion of the moving jig. and a fixing jig that is fitted with the movable jig, and the movable jig has a second groove that matches the diameter of the coil wire and extends from the circumferential surface toward the center and reaches the first annular groove, in order to clamp the end of the coil. is established,
Since the fixing jig was provided with a hole that was fitted into the fitting protrusion of the moving jig, one end of the coil wire was hooked into the second groove and inserted into the first annular groove. A circular coil with a predetermined inner diameter is formed by simply winding the wire, and by simply hooking the other end of the coil wire into the second groove and deflecting the moving jig or fixing jig, the end portion can be made at right angles. It is possible to easily manufacture a coil that is bent in a shape without changing its shape. Therefore, in use, by simply setting a large number of the first and second grooves, toroidal coils of various diameters can be easily obtained, and furthermore, no skill is required when manufacturing the toroidal coils. have an effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a coil for a rotating transformer, Fig. 2 is a perspective view showing an example of a jig for cutting coil material, and Fig. 3 is a partially cross-sectional perspective view showing an embodiment of the jig of the present invention. FIG. 4 is a diagram for explaining the spiral coil. 10... Manufacturing jig, 11... Moving jig, 11a
...First ring groove, 12...Fixing jig, 11b...
Second groove, 11c...fitting protrusion, 12a...fitting hole.

Claims (1)

[Claims] 1. A moving jig in which a first ring groove with a width of a semicircular cross section that matches the inner diameter and wire diameter of the circular coil is formed on the side surface, and a fixing jig that fits into the fitting protrusion of the moving jig. In order to align the ends of the coil, the moving jig is provided with a second groove that extends from the circumferential surface toward the center and reaches the first annular groove, which matches the diameter of the coil wire. A manual jig for a circular coil, characterized in that a hole is formed to fit into a fitting protrusion of the tool.