JP7564051B2 - Bobbin Jig - Google Patents

Description

The present invention relates to a bobbin jig.

Conventionally, a transformer has been proposed that includes an iron core, a primary coil, and a secondary coil.

Patent document 1 discloses a transformer that includes a resin bobbin having a rectangular annular outer frame and inner frame, with grooves formed along the circumferential direction on the outer peripheral surfaces of the outer frame and inner frame, and with coils wound in each groove of the outer frame and inner frame.

Japanese Patent Application Publication No. 8-051034

As mentioned above, some bobbins used for winding coils of transformers and the like have multiple grooves formed on the outer circumferential surface over the entire circumference of the bobbin. In such bobbins, partition walls are provided between the grooves, protruding radially outward.

When winding a coil on a bobbin with multiple grooves, the coil is first wound around one of the grooves (hereafter referred to as the target groove). During this winding, as the amount of coil winding increases, the pressure applied to the partition wall also increases, and the partition wall cannot withstand this pressure and falls over toward the adjacent hollow groove, becoming deformed.

In order to prevent such deformation of the partition wall, a block (jig) is hammered into the groove next to the target groove with a hammer or the like to prevent deformation of the partition wall, and when the coil winding in the target groove is completed, the block is removed from the groove next to the target groove.
However, the work of hammering the blocks in and removing the blocks is time-consuming, which reduces workability.

The present invention was made in consideration of these circumstances, and its purpose is to provide a bobbin jig that can be more easily attached to and detached from the bobbin groove.

The bobbin jig according to the present invention is a bobbin jig that is attached to a bobbin during coil winding, and includes a first semi-ring portion and a second semi-ring portion that are joined together to form a ring shape, and a connecting mechanism that connects one end of the first semi-ring portion and one end of the second semi-ring portion, and the first semi-ring portion and the second semi-ring portion are guided by the connecting mechanism to move toward and away from each other.

In the present invention, the first and second semi-ring portions are connected by a connecting mechanism, and the first and second semi-ring portions can be moved toward and away from each other by being guided by the connecting mechanism. Therefore, the bobbin jig can be easily attached to and detached from the bobbin.

In the bobbin jig according to the present invention, the connecting mechanism has a first member fixed to the first half-ring portion and a second member fixed to the second half-ring portion, the second member has a protrusion, and the first member has a rail portion that engages with the protrusion and guides the sliding of the protrusion.

In the present invention, the protrusion of the second member fixed to the second half-ring portion engages with and slides on the rail portion of the first member fixed to the first half-ring portion. Therefore, the first half-ring portion and the second half-ring portion can be guided by the connecting mechanism and moved toward and away from each other.

In the bobbin jig of the present invention, the protrusion has a cylindrical shape, and the first member is rotatable around the protrusion as an axis.

In the present invention, the projection of the second member is cylindrical, so it can rotate while engaged with the rail portion of the first member. Therefore, the first half-ring portion to which the first member is fixed can rotate around the projection of the second member as an axis. This makes it easier to attach and detach the bobbin jig to and from the bobbin.

The bobbin jig according to the present invention is provided at the other end of the first semi-ring portion and the other end of the second semi-ring portion with an engaging portion and an engaged portion, respectively, that prevent the first semi-ring portion and the second semi-ring portion from separating from each other.

In the present invention, the engaging portion of the first semi-ring portion and the engaged portion of the second semi-ring portion are engaged with each other, thereby preventing the first semi-ring portion and the second semi-ring portion from separating from each other.

The bobbin jig according to the present invention includes a first moving member provided in an intervening portion between both ends of the first semi-ring portion and movable in a thickness direction of the first semi-ring portion, and a second moving member provided in an intervening portion between both ends of the second semi-ring portion and movable in a thickness direction of the second semi-ring portion.

In the present invention, the first moving member provided in the intervening portion of the first half-ring portion is moved in the thickness direction of the first half-ring portion, and the second moving member provided in the intervening portion of the second half-ring portion is moved in the thickness direction of the second half-ring portion, and is supported by being pressed against the wall of the bobbin groove. This prevents the wall of the bobbin from being deformed.

The bobbin jig according to the present invention comprises a first rotating member that is embedded in the intermediate portion of the first semi-annular portion and is rotatable around the axis of the first cylindrical portion, and includes a first screw post that protrudes from the first moving member and has a screw thread formed on its outer peripheral surface, and a first cylindrical portion that screws with the first screw post, and a second rotating member that is embedded in the intermediate portion of the second semi-annular portion and is rotatable around the axis of the second cylindrical portion, and includes a second screw post that protrudes from the second moving member and has a screw thread formed on its outer peripheral surface, and a second cylindrical portion that screws with the second screw post, and a second rotating member that is embedded in the intermediate portion of the second semi-annular portion and is rotatable around the axis of the second cylindrical portion.

In the present invention, when the first rotating member rotates, the first cylindrical portion also rotates, and the first screw post of the first moving member moves in the axial direction of the first cylindrical portion. When the second rotating member rotates, the second cylindrical portion also rotates, and the second screw post of the second moving member moves in the axial direction of the second cylindrical portion. Therefore, the first semi-annular portion of the first moving member moves in the thickness direction, and the second semi-annular portion of the second moving member moves in the thickness direction easily and appropriately.

The present invention provides a bobbin jig that can be more easily attached to and detached from the bobbin groove.

1A and 1B are a perspective view and an exploded view showing a bobbin jig according to an embodiment of the present invention; FIG. 4 is a front view showing a first half ring portion of the bobbin jig. FIG. 11 is another view showing the first half ring portion of the bobbin jig. FIG. 13A and 13B are diagrams showing an operating portion of the first half ring portion. FIG. 13 is a view showing a cover member of the first half ring portion. FIG. 13 is a view showing a first moving member of the first half ring portion. 5A to 5C are explanatory diagrams illustrating a method of mounting the bobbin jig of the present embodiment on a bobbin.

Below, a bobbin jig according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

(Embodiment 1)
FIG. 1 is a perspective view and an exploded view showing a bobbin jig 100 according to the present embodiment. The bobbin jig 100 is used when winding a coil around a bobbin of a transformer or the like. The bobbin jig 100 is made of a light metal such as aluminum, and has an annular shape as shown in FIG. 1A. More specifically, the bobbin jig 100 has an elliptical shape having two parallel straight portions and end portions provided at both ends of the straight portions. Hereinafter, for convenience, the extension direction of the straight portions is referred to as the length direction, and the direction perpendicular to the length direction is referred to as the width direction. The bobbin jig 100 can be separated into two parts.

As shown in FIG. 1B, the bobbin jig 100 is separated into two at the straight portion. That is, the bobbin jig 100 is divided into a first semi-ring portion 10 having a substantially semi-elliptical shape and a second semi-ring portion 50 having a substantially semi-elliptical shape, and the first semi-ring portion 10 and the second semi-ring portion 50 are joined together to form the elliptical bobbin jig 100.

One end 11 of both ends of the first semi-ring portion 10 and one end 51 of both ends of the second semi-ring portion 50 are connected by a connecting mechanism 20. The connecting mechanism 20 has a first member 21 provided on the first semi-ring portion 10 and a second member 22 provided on the second semi-ring portion 50. A prevention mechanism 30 that prevents the first semi-ring portion 10 and the second semi-ring portion 50 from separating is attached to the other end 12 of the first semi-ring portion 10 and the other end 52 of the second semi-ring portion 50. The prevention mechanism 30 has an engaging portion 31 provided on the first semi-ring portion 10 and an engaged portion 32 provided on the second semi-ring portion 50.

Figure 2 is a front view showing the first half ring portion 10 of the bobbin jig 100, and Figure 3 is another view showing the first half ring portion 10 of the bobbin jig 100. Figure 3A is an arrow view taken along line IIIA-IIIA in Figure 2, Figure 3B is a cross-sectional view taken along line IIIB-IIIB in Figure 2, and Figure 3C is a cross-sectional view taken along line IIIC-IIIC in Figure 2.

The first semi-annular portion 10 has a semi-elliptical portion 13 and a first moving member 15 attached to the semi-elliptical portion 13 so as to be movable in the thickness direction.
The semi-elliptical portion 13 has an end portion 14 (intervening portion) extending in the width direction (hereinafter simply referred to as the width direction) of the bobbin jig 100. Both ends of the end portion 14 are curved, and a short straight portion 14a associated with one end portion 11 and a long straight portion 14b associated with the other end portion 12 are connected to both ends of the end portion 14, respectively.

The semi-oval portion 13 has flat end faces in the thickness direction, and a first moving member 15 is attached to one of the end faces (see FIG. 3A). An operating part 16 (first rotating member) that moves the first moving member 15 is embedded in the end portion 14 of the semi-oval portion 13, as described below. As shown in FIG. 3C, a receiving recess 141 is formed in the end portion 14, and the operating part 16 is received in the receiving recess 141 from one side of the end portion 14 and is covered by a lid member 142. A part of the operating part 16 protrudes from the outer circumferential surface of the semi-oval portion 13.

Furthermore, in the semi-elliptical portion 13, the first member 21 of the connecting mechanism 20 is screwed to the outer surface of the short straight portion 14a, and the engagement portion 31 is screwed to the outer surface of the long straight portion 14b (see Figure 2).

Figure 4 is a diagram showing the semi-elliptical portion 13. Figure 4A is a diagram showing the semi-elliptical portion 13 from one side, and Figure 4B is a view taken along line B-B in Figure 4A. For convenience, Figure 4 shows the state without the cover member 142.

The long linear portion 14b of the semi-oval portion 13 has its outer periphery cut away to form a reduced width portion 121 with a reduced width dimension, and a screw hole 122 is formed in the reduced width portion 121 for screwing the engagement portion 31. The short linear portion 14a of the semi-oval portion 13 has its outer periphery cut away to form a reduced width portion 111 with a reduced width dimension, and a screw hole 112 is formed in the reduced width portion 111 for screwing the first member 21.

Furthermore, in the semi-elliptical portion 13, a first through hole 143 penetrating in the thickness direction is formed at the base of the short linear portion 14a and the base of the long linear portion 14b (see FIG. 3B). Then, in one surface of the semi-elliptical portion 13, a rectangular recess 145 is formed in the center of the end portion 14 by cutting in the thickness direction of the end portion 14. The rectangular recess 145 is a rectangle with the width direction as the longitudinal direction. The first through holes 143 are also formed at equal intervals on both sides of the rectangular recess 145 in the width direction. A substantially semicircular receiving recess 141 is further formed in the center of the bottom of the rectangular recess 145 to receive the operating unit 16. A second through hole 144 is formed in the center of the receiving recess 141. The second through hole 144 has a diameter slightly larger than the outer diameter of the first cylindrical portion 162 of the operating unit 16 described later. At the bottom of the rectangular recess 145, between the second through hole 144 and both first through holes 143, a small diameter through hole 146 having a smaller diameter than the first through hole 143 and the second through hole 144 is formed. The first through hole 143 and the second through hole 144 are formed near the outer periphery of the semi-elliptical portion 13.

Fig. 5 is a diagram showing the operating portion 16 of the first semi-ring portion 10. Fig. 5A is a front view of the operating portion 16, and Fig. 5B is a view taken along line BB in Fig. 5A.
The operation unit 16 has a first cylindrical portion 162 having a long hole 163, and a screw thread is formed on the inner peripheral surface of the first cylindrical portion 162. An operation disk 161 is connected to the outer peripheral surface of the first cylindrical portion 162 at a longitudinal intermediate portion of the first cylindrical portion 162. The operation disk 161 extends in the radial direction of the first cylindrical portion 162, and has a diameter slightly smaller than that of the receiving recess 141. Long holes 164 are formed in the outer peripheral surface of the operation disk 161 at equal intervals in the circumferential direction. The long holes 164 extend in the radial direction of the operation disk 161.

Fig. 6 is a view showing the cover member 142 of the first semi-ring portion 10. Fig. 6A is a front view of the cover member 142, and Fig. 6B is a view taken along line BB in Fig. 6A.
The cover member 142 is a plate-like shape having a rectangular shape and size corresponding to the rectangular recess 145 of the end portion 14. The cover member 142 has through holes 142b at both ends in the longitudinal direction, at positions facing the small diameter through holes 146 of the end portion 14 when the cover member 142 is assembled to the end portion 14. A counterbore 142c is formed on one side of each through hole 142b. A through hole 142a is formed in the center of the cover member 142, near one of the long sides. When the cover member 142 is assembled to the end portion 14, the through hole 142a faces the second through hole 144 of the end portion 14, and has a diameter slightly larger than the outer diameter of the first cylindrical portion 162 of the operating portion 16.

As described above, the operating unit 16 is received in the receiving recess 141. More specifically, as shown in FIG. 3C, one end of the first cylindrical portion 162 of the operating unit 16 is inserted into the second through hole 144 from the one surface side of the semi-elliptical portion 13, and the operating disk 161 is placed in the receiving recess 141. Next, the cover member 142 is fitted into the rectangular recess 145 of the end portion 14 so that the other end of the first cylindrical portion 162 is inserted into the through hole 142a of the cover member 142, and a screw is inserted into the through hole 142b and screwed into the small diameter through hole 146. As a result, both ends of the first cylindrical portion 162 of the operating unit 16 are supported by the second through hole 144 and the through hole 142a, respectively, and the operating unit 16 can rotate around the axis of the first cylindrical portion 162.

Figure 7 is a diagram showing the first moving member 15 of the first semi-annular portion 10. Figure 7A is a front view of the first moving member 15, and Figure 7B is a view taken along line B-B in Figure 7A. As shown in Figures 3A and 3C, the first moving member 15 is arranged in parallel in the thickness direction at the end portion 14 of the semi-elliptical portion 13, excluding the short linear portion 14a and the long linear portion 14b.

The first moving member 15 has a curved plate portion 153 that is similar to the end portion 14 and is slightly thinner than the end portion 14 (see FIG. 1B). In the curved plate portion 153, a first screw column 151 having a cylindrical shape with a screw thread formed on the circumferential surface is provided in the center of one surface of the curved plate portion 153 that faces the end portion 14. In the width direction, cylinders 152 are protruding at equal intervals on both sides of the first screw column 151, and cylinders 152 are also protruding on both ends of the curved plate portion 153. That is, in the first moving member 15, two cylinders 152 are provided symmetrically on both sides of the first screw column 151. Each cylinder 152 protrudes vertically from the one surface of the curved plate portion 153 toward the end portion 14.

The diameter of each cylinder 152 is larger than that of the first screw post 151. Each cylinder 152 is provided at a position corresponding to the first through hole 143 of the end portion 14 when the first moving member 15 is attached to the semi-oval portion 13. The first screw post 151 is provided at a position corresponding to the first cylindrical portion 162 (long hole 163) of the operating portion 16 when the first moving member 15 is attached to the semi-oval portion 13. The diameter of the cylinder 152 is slightly smaller than the first through hole 143.
When the first movable member 15 is attached to the semi-elliptical portion 13, each cylinder 152 is inserted into the first through hole 143 of the end portion 14 (see FIG. 3B), and the first screw column 151 is screwed into the first cylindrical portion 162 of the operating portion 16 (see FIG. 3C).

In this way, when the first moving member 15 is attached to the semi-elliptical portion 13, the first screw column 151 screws into the first cylindrical portion 162 of the operating portion 16, so that the first screw column 151 (first moving member 15) moves in the thickness direction of the end portion 14, that is, in the direction approaching the end portion 14 or in the direction moving away from the end portion 14, by the operator rotating the operating portion 16 (operating disk 161) forward or backward. At this time, as described above, each cylinder 152 of the first moving member 15 slides in the first through hole 143 in the length direction of the first through hole 143 while being inserted into the corresponding first through hole 143 of the end portion 14. Therefore, the distance between the curved plate portion 153 of the first moving member 15 and the one surface of the end portion 14 is kept constant over the entire range of the one surface. When rotating the operating part 16, the operator can insert a thin rod such as a screwdriver into the long hole 164 of the operating part 16 to use it as a lever.

On the other hand, the second semi-annular portion 50 has a semi-elliptical portion 53 and a second moving member 55 attached to the semi-elliptical portion 53 so as to be movable in the thickness direction.
The semi-elliptical portion 53 has an end portion 54 (intervening portion) that extends in the width direction of the bobbin jig 100. Both ends of the end portion 54 are curved, and a long straight portion 54a associated with one end portion 51 and a long straight portion 54a associated with the other end portion 52 are connected to both ends of the end portion 54, respectively.

Both end faces of the semi-oval portion 53 in the thickness direction are flat, and a second moving member 55 is attached to one of the end faces (see FIG. 1B). An operating part 56 (see FIG. 8A) that moves the second moving member 55 is embedded in the end portion 54 of the semi-oval portion 53. As with the end portion 14, a receiving recess (not shown) is formed in the end portion 54, and the operating part 56 (second rotating member) is received in the receiving recess from one side of the end portion 54 and is covered by a lid member 542. A part of the operating part 56 protrudes from the outer circumferential surface of the semi-oval portion 53.

The end portion 54 also has through holes (not shown) that correspond to the first through hole 143 and the second through hole 144 of the end portion 14. Furthermore, the second moving member 55 also has a second screw column and a cylinder (not shown) that correspond to the first screw column 151 and the cylinder 152 of the first moving member 15.

Furthermore, in the semi-elliptical portion 53, the outer periphery of the long straight portion 54a is cut off to form a reduced width portion 511 with a reduced width dimension, and the second member 22 of the connecting mechanism 20 is screwed to the reduced width portion 511. In addition, in the semi-elliptical portion 53, the outer periphery of the short straight portion 54b is cut off to form a reduced width portion 521 with a reduced width dimension, and the engaged portion 32 of the prevention mechanism 30 is screwed to the reduced width portion 521 (see FIG. 1B).

Otherwise, the configurations of the semi-elliptical portion 53, second moving member 55, operating portion 56, and lid member 542 in the second semi-ring portion 50 are the same as the configurations of the semi-elliptical portion 13, first moving member 15, operating portion 16, and lid member 142 in the first semi-ring portion 10. The operating portion 56 has a second cylindrical portion (not shown) that corresponds to the first cylindrical portion 162 of the operating portion 16.

In addition, in the second half ring portion 50, when the operator rotates the operating portion 56 forward or backward, the second moving member 55 moves in the thickness direction of the end portion 54, i.e., in the direction approaching the end portion 54 or in the direction moving away from the end portion 54.

The prevention mechanism 30 is, for example, an adjustment fastener, and the engaged portion 32 screwed to the reduced width portion 521 of the short linear portion 54b of the second half ring portion 50 is hook-shaped, and the engaging portion 31 screwed to the reduced width portion 121 of the long linear portion 14b of the first half ring portion 10 is ring-shaped and engages with the engaged portion 32 (see FIG. 1B). Furthermore, the prevention mechanism 30 has a lever 33 used to engage and disengage the engaging portion 31 and the engaged portion 32. The adjustment fastener is itself well known, and a detailed description will be omitted.

As described above, the connecting mechanism 20 has the first member 21 provided on the first semi-ring portion 10 and the second member 22 provided on the second semi-ring portion 50 .
As shown in FIG. 1 and FIG. 2, the first member 21 extends along the length direction of the bobbin jig 100. The first member 21 has a rectangular parallelepiped fixed portion 211 that is screwed to the outer surface of the reduced width portion 111 of the short linear portion 14a of the semi-elliptical portion 13. The fixed portion 211 extends along the short linear portion 14a, and a pair of rail portions 212 are connected to the tip surface of the fixed portion 211 at a predetermined interval in the thickness direction of the short linear portion 14a. Each rail portion 212 has a long and narrow plate shape, and both corners of the tip are rounded. In addition, an elliptical through hole 213 that extends along the longitudinal direction is formed in the center of each rail portion 212, and each rail portion 212 is flush with both surfaces of the fixed portion 211 that face each other in the thickness direction of the semi-elliptical portion 13. The distance between the rail portions 212 is slightly larger than the dimension of the second member 22 in the thickness direction of the semi-elliptical portion 53 .

The second member 22 has a rectangular parallelepiped shape that extends along the length of the bobbin jig 100, and as described above, is screwed to the long linear portion 54a of the semi-elliptical portion 53, with one surface abutting the outer surface of the reduced width portion 511. Both edges of the tip of the second member 22 are rounded.

In addition, an engagement protrusion 221 is provided on the tip of the second member 22, on both opposing surfaces adjacent to the one surface. The engagement protrusion 221 is cylindrical. When the first member 21 and the second member 22 are joined, each engagement protrusion 221 engages with the corresponding oval through hole 213 of the rail portion 212.

Furthermore, the distance between the two opposing surfaces of the second member 22, i.e., the thickness of the second member 22, is thinner than the thickness of the semi-elliptical portion 53 (long straight portion 54a), and a step is formed between the two opposing surfaces of the second member 22 and the long straight portion 54a (see FIG. 1B). The thickness of the second member 22 is slightly thinner than the distance between the rail portions 212 of the first member 21 of the first semi-annular portion 10.

As a result, when the first half-ring portion 10 and the second half-ring portion 50 are joined, i.e., when the first member 21 and the second member 22 are joined, each engagement protrusion 221 engages with the corresponding oval through hole 213 of the rail portion 212, and the second member 22 is interposed between the pair of rail portions 212.

Therefore, the second member 22 can move in the length direction of the bobbin jig 100 along the rail portion 212 (elliptical through hole 213) of the first member 21 and guided by the step formed between the two opposing surfaces of the second member 22 and the long linear portion 54a. At this time, the engagement protrusion 221 is guided by the elliptical through hole 213 and slides within the elliptical through hole 213. In other words, the first semi-ring portion 10 and the second semi-ring portion 50 can move toward and away from each other while being connected as described above via the connecting mechanism 20.

As described above, the movement of the second member 22 or the first member 21 is limited in the length direction of the bobbin jig 100 because the movement of the rail portion 212 is guided by the engaging projection 221 and the step between the opposing surfaces of the second member 22 and the long straight portion 54a.

However, because both corners of the tip of the rail portion 212 are rounded, when the tip of the rail portion 212 moves to the tip position of the second member 22, in other words, when the engagement protrusion 221 is inscribed in the longitudinal end of the oval through hole 213, the above restriction is released. Therefore, the first member 21 (first semi-ring portion 10) can rotate around the engagement protrusion 221, with the engagement protrusion 221 as an axis (see FIG. 8B).

FIG. 8 is an explanatory diagram for explaining a method of mounting the bobbin jig 100 of this embodiment onto the bobbin 200. As shown in FIG.
The bobbin 200 is used for winding coils of transformers and the like, and is made of resin in a hollow rectangular ring shape. A groove extending in the circumferential direction is formed on the outer peripheral surface of the bobbin 200 around the entire circumference of the bobbin 200. The groove is divided into two parts. That is, a partition wall protruding radially outward is formed at the bottom of the groove. The partition wall extends in the circumferential direction and is provided around the entire circumference of the bobbin 200.

Prior to mounting the bobbin jig 100 to the bobbin 200, the operator may rotate the operating part 16 of the first semi-ring part 10 as appropriate to bring the first moving member 15 closer to the semi-elliptical part 13, and rotate the operating part 56 of the second semi-ring part 50 as appropriate to bring the second moving member 55 closer to the semi-elliptical part 53, thereby improving the convenience of the mounting operation.

As shown in FIG. 8A, the operator operates the lever 33 of the prevention mechanism 30 to unlock the engagement between the engaging portion 31 of the first half-ring portion 10 and the engaged portion 32 of the second half-ring portion 50, and moves the first half-ring portion 10 and the second half-ring portion 50 in a direction away from each other. At this time, the connecting mechanism 20 guides the movement of the first half-ring portion 10 and the second half-ring portion 50. The operator moves the second half-ring portion 50 until the engaging protrusion 221 (not shown) of the second half-ring portion 50 is inscribed in the longitudinal end of the oval through hole 213. At this time, the first half-ring portion 10 and the second half-ring portion 50 are connected via the connecting mechanism 20.

Next, the operator rotates the first half-ring portion 10 in the direction of the black arrow in Figure 8B, using the engaging protrusion 221 of the second half-ring portion 50 as the axis of rotation so that the gap between the engaging portion 31 and the engaged portion 32 becomes wider.

Then, the worker fits the bobbin jig 100 into the bobbin 200 with the gap between the engaging portion 31 and the engaged portion 32 widened. First, the second semi-ring portion 50 is fitted into the inside of one of the two grooves of the bobbin 200, and then the first semi-ring portion 10 is rotated in the direction of the black arrow in Figure 8C so that the gap between the engaging portion 31 and the engaged portion 32 narrows.

Then, the operator moves the first moving member 15 in a direction away from the semi-elliptical portion 13 by appropriately rotating the operating portion 16 of the first semi-elliptical portion 10. The operator also moves the second moving member 55 in a direction away from the semi-elliptical portion 53 by appropriately rotating the operating portion 56 of the second semi-elliptical portion 50.

Then, the worker moves the first and second half-ring portions 10 and 50 in a direction toward each other. At this time, the connecting mechanism 20 guides the movement of the first and second half-ring portions 10 and 50. Next, the worker operates the lever 33 of the prevention mechanism 30 to engage the engaging portion 31 of the first half-ring portion 10 and the engaged portion 32 of the second half-ring portion 50 (see FIG. 8D).

The above series of operations completes the installation of the bobbin jig 100 on the bobbin 200. The bobbin jig 100 is installed in one of the grooves of the bobbin 200, and the semi-elliptical portion 13 and the first moving member 15, and the semi-elliptical portion 53 and the second moving member 55 are pressed against the inner surface and partition wall of the one of the grooves of the bobbin 200. This supports the partition wall from one of the grooves. After this, the winding device starts winding a coil into the other groove of the bobbin 200 to which the bobbin jig 100 is installed.

When winding of the coil into the other groove of the bobbin 200 is completed, the bobbin jig 100 can be removed in the order of Figures 8D, 8C, 8B, and 8A.

On the other hand, if the bobbin has grooves on its outer periphery and these grooves are divided by a partition wall, the coil is wound into one groove first, and then into the other groove. However, when winding the coil into one groove first, as the amount of coil winding increases, the pressure applied to the partition wall increases, and the partition wall cannot withstand this pressure and falls toward the other adjacent groove, which is hollow, and becomes deformed.

To solve this problem, workers generally use a hammer to hammer a block into the other hollow groove, preventing deformation of the partition wall. However, the work of hammering the blocks in and removing them in this way is time-consuming, and the degree to which the blocks are hammered varies depending on the worker's skill and the amount of force used, resulting in reduced workability and inconsistent quality in the finished product.

In contrast, the bobbin jig 100 of the present embodiment can be easily attached to and detached from the bobbin 200, as described above, improving workability. In addition, consistent quality can be guaranteed regardless of the skill level of the worker.

The above describes an example in which the prevention mechanism 30 is an adjustment fastener, but this is not limited to this, and any mechanism that can prevent the first half ring portion 10 and the second half ring portion 50 from separating can be used.

In the above, an example has been described in which the bobbin jig 100 has four cylinders 152, but this is not limited thereto, and it is sufficient that there is one or more cylinders 152.

Furthermore, in the above description, the operating unit 16, the operating unit 56, the first moving member 15, and the second moving member 55 are provided at the end portion of the bobbin jig 100, and the prevention mechanism 30 and the connecting mechanism 20 are provided at the straight portion of the bobbin jig 100, but this is not limited to the above. The operating unit 16, the operating unit 56, the first moving member 15, and the second moving member 55 may be provided at the straight portion of the bobbin jig 100, and the prevention mechanism 30 and the connecting mechanism 20 may be provided at the end portion of the bobbin jig 100.

The disclosed embodiment 1 should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims, not by the above meaning, and is intended to include all modifications within the meaning and scope of the claims.

10: First half ring part, 14: End part (intervening part), 15: First moving member, 16: Operating part (first rotating member), 20: Connection mechanism, 21: First member (first member) , 22: second member, 30: prevention mechanism, 31: engaging portion, 32: engaged portion, 50: second half ring portion, 54: end portion (intervening portion), 55: second moving member, 56 : Operation part (second rotating member), 100: Bobbin jig, 151: First screw column, 162: First cylindrical part, 200: Bobbin, 212: Rail part, 221: Engagement protrusion

Claims (6)

A bobbin jig that is attached to a bobbin during coil winding,
a first semi-ring portion and a second semi-ring portion that are joined to form a ring shape;
a connecting mechanism that connects one end of the first semi-ring portion and one end of the second semi-ring portion,
The first and second semi-ring portions are guided by the connecting mechanism to move toward and away from each other. the connecting mechanism includes a first member fixed to the first half-ring portion and a second member fixed to the second half-ring portion,
The second member has a protrusion,
The bobbin jig according to claim 1 , wherein the first member has a rail portion that engages with the protrusion and guides the sliding of the protrusion. The protrusion has a cylindrical shape,
The bobbin jig according to claim 2 , wherein the first member is rotatable about the projection as an axis. The bobbin jig according to any one of claims 1 to 3, wherein the other end of the first half ring portion and the other end of the second half ring portion are provided with an engaging portion and an engaged portion, respectively, that prevent the first half ring portion and the second half ring portion from separating from each other. a first movable member provided in an intermediate portion between both end portions of the first semi-annular portion and movable in a thickness direction of the first semi-annular portion;
The bobbin jig according to claim 1 , further comprising: a second moving member provided in an intervening portion between both end portions of the second semi-ring portion and movable in a thickness direction of the second semi-ring portion. A first threaded post protruding from the first moving member and having a screw thread formed on an outer circumferential surface thereof;
a first rotating member including a first cylindrical portion that is screwed onto the first screw post and is embedded in the intermediate portion of the first half ring portion so as to be rotatable around an axis of the first cylindrical portion;
A second threaded post protruding from the second moving member and having a screw thread formed on an outer circumferential surface thereof;
The bobbin jig according to claim 5 , further comprising: a second cylindrical portion that screws onto the second screw post; and a second rotating member that is embedded in the intermediate portion of the second semi-annular portion and rotatable around an axis of the second cylindrical portion.

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