JP2720277B2 - Bobbin holding method of automatic winding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic winding machine for winding a wire around a bobbin bobbin, and more particularly to a bobbin holding method in which a plurality of ribs are provided on an inner wall of a bobbin hole. is there.

[0002]

2. Description of the Related Art As shown in FIG.
There is a coil component comprising a bobbin 10 having a plurality of ribs 14 on the inner wall of 11. After a wire is wound around the bobbin 12, an inductance adjusting screw core made of a magnetic material (not shown) is press-fitted into the bobbin 12 while rotating into the bobbin 12. When the screw core is press-fitted, a female screw is cut into the rib 14 by the screw core. Bobbin 10 like this
In order to perform winding by an automatic winding machine, for example, as shown in FIG. 8, an automatic winding machine having a center pin 20 having a deep split groove 22 at its tip and having elasticity is used. The two elastic pieces 24 are inserted into the holes 11 of the bobbin 10, and the bobbin 10 is held by utilizing the elasticity.

[0003]

However, when the bobbin 10 is reduced in size and the inner diameter of the winding shaft 12 is reduced to about 3 mm or less, the processing of the center pin 20 becomes difficult, the strength of the elastic piece 24 decreases, and the elastic force decreases. There was a drawback that the force for holding the bobbin 10 was reduced due to the reduction in size. In addition, since the elastic piece 24 is easily deformed by an external force and the fluctuation of the holding force becomes large, a small bobbin is used.
It was difficult to hold 10 stably, and there was a problem that troubles in bobbin holding occurred frequently.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the drawbacks of the conventional automatic winding machine, to obtain a stable bobbin holding force without deformation of the center pin, and in particular, to allow a hole in the winding shaft to penetrate. It is an object of the present invention to provide a bobbin holding method for an automatic winding machine suitable for a small bobbin that is not used.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a cylindrical holder having a through hole extending in a longitudinal direction and having a projection or a recess formed at a tip end thereof for fitting to a bobbin winding shaft. At the front end of the small-diameter portion, an engaging portion having a diameter larger than the small-diameter portion is formed, and a groove corresponding to the rib of the bobbin is formed around the engaging portion, and the metal is inserted into the through hole of the holder. The center pin is movable along the longitudinal axis in the through hole of the holder, and is rotatable about the axis in the holder. A bobbin that is biased and forms a bobbin holding part of an automatic winding machine so that it can rotate about this axis while the center pin and the holder are integrally connected, and the winding axis can be fitted to the tip of the holder. So that the hole of the reel faces the center pin. Insert the tip of the center pin projected from the holder into the hole of the bobbin winding shaft by aligning the groove of the engaging portion with the position of the rib, and then rotate the center pin by a predetermined angle to engage. The bobbin holding method of the automatic winding machine that cuts the rib at the part, retracts the center pin with the engaging part biting into the rib, and holds the bobbin between the engaging part and the holder that bite into the rib And

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking as an example a case where the bobbin 10 shown in FIG. 7 is held.
In addition, in FIGS.
The left direction is described as backward. FIG. 1 shows a main portion of a bobbin holding portion of an automatic winding machine and a bobbin 10 disposed in front of the main portion. The bobbin 10 is made up of a reel 12 and a base
The base 18 has terminals 19 implanted therein. Reel
Four ribs 14 are provided on the inner wall of the hole 11 through which the hole 12 does not penetrate, and two concave portions 16 are formed in the flange 15 at the upper end of the winding shaft 12.

Reference numeral 30 denotes a cylindrical holder, and reference numeral 40 denotes a center pin movably mounted in the holder 30. As shown in FIG. 6, the holder 30 has a through hole 32 extending in the longitudinal direction, and a protrusion 34 that can be engaged with the concave portion 16 of the bobbin 10 is formed at the distal end. The center pin 40 is made of an elongated round bar-shaped metal as a whole, and includes a columnar base 42 and a columnar small diameter portion 44 smaller in diameter than the base 42. At the front end of the small diameter portion 44, an engagement portion 46 having a larger diameter than the small diameter portion 44 is provided, and the periphery of the engagement portion 46 is processed into a thin and sharp shape. Around the engagement portion 46, a groove 48 large enough to allow the rib 14 of the bobbin 10 to pass is formed at a position corresponding to the rib 14. The diameter of the engaging portion 46 is slightly smaller than the inner diameter of the hole 11 of the bobbin 10, and the engaging portion 46 is inserted into the hole 11 of the bobbin 10 only when the rib 14 and the groove 48 are aligned. it can. Also, the diameter of the small diameter portion 44 is slightly smaller than the diameter of the circle contacting the inside of the four ribs 14,
44 can be fitted into the hole 11 of the bobbin 10 with almost no gap. The center pin 40 is inserted into the through hole 32 of the holder 30, can move a predetermined distance along the longitudinal axis A in the through hole 32, and is 45 ° around the axis A in the holder 30. Only to be able to rotate. Center pin 40
Is always urged rearward with respect to the holder 30 by the spring 50. And center pin 40 and holder 30
Are rotatable about an axis A in a state of being integrally connected.

Next, the operation of the bobbin holding section of the automatic winding machine will be described. Although not shown in FIGS. 1 to 3, a vertically movable supply table 60 as shown in FIGS. 4 and 5 is provided in front of the bobbin holding section. The bobbin 10 is placed on a depression of the supply table 60, and a rod 62 to which a spring 65 for absorbing an impact is attached is brought into contact with the tip of the terminal 19. As a result, the movement of the bobbin 10 in directions other than the leftward and upward directions in FIG. 4 is restricted. Figure 1 shows a bobbin
The state when the supply stand 60 is lifted up to the position where the hole 11 of the ten winding shaft 12 faces the center pin 40 is shown. As described above, from the state where the bobbin 10 is transferred and arranged in front of the bobbin holding portion, first, the rear portion of the center pin 40 is pressed by an air cylinder or the like (not shown) so that the tip portion protrudes from the holder 30, and the rib 14 is The engaging portion 46 and the small diameter portion 44 are inserted into the hole 11 of the winding shaft 12 so as to pass through the groove 48. Then, as shown in FIG. 2, the center pin 40 is advanced until the engaging portion 46 reaches the depth of the hole 11, and in this state, the center pin 40 is rotated by about 45 ° to cut the engaging portion 46 into the rib 14. I do. Since the bobbin 10 is formed of an elastic resin, the rib 14 is cut off by the metal engaging portion 46, and the engaging portion 46 is cut into the rib 14. Thereafter, when the air cylinder is retracted, the center pin 40 is retracted by the force of the spring 50 to move the bobbin 10 to the
(Fig. 4 and Fig. 5)
When the recess 16 of the holder 30 is fitted to the projection 34 of the holder 30, the operation stops. In this way, the bobbin 10 is
The holder is sandwiched and held between the engagement portion that has bitten into and the front end of the holder 30.

Since the projection 34 of the holder 30 is fitted in the recess 16 of the bobbin 10, the bobbin 10 does not rotate, and the small diameter portion 44 of the center pin 40 has almost no gap in the hole 11 of the bobbin 10. Since the bobbin 10 is fitted, the bobbin 10 is accurately positioned with little center displacement and is held by the bobbin holding section. Therefore, after lowering the supply stand 60, the center pin 40 and the holder 30 are rotated about the axis A, whereby the bobbin 10 can be easily wound around the winding shaft 12. After the winding is completed, the supply pin 60 is raised, the center pin 40 is advanced, and the bobbin 10 is returned on the supply table 60. Just pull out from 10. When the center pin 40 is pulled out from the bobbin 10, the bobbin 10 is pressed by a stopper (not shown) or the like.

The holder 34 is provided with the projection 34 and the bobbin 10 is provided with the concave portion 16. On the contrary, the projection is provided on the bobbin 10 side.
Recesses may be formed on the holder 30 side, respectively. In addition, a spring for applying a rotational force to the center pin 40 about the A axis is provided, and the center pin 40 is rotated 45 ° in advance against the spring before inserting the bobbin 10 before inserting the bobbin 10, and after inserting the bobbin 10 The rib 14 may be cut by the engagement portion 46 by being opened and rotated by the elasticity of the spring. Needless to say, the angle at which the center pin 40 is rotated is not limited to 45 °, but is determined according to the number and position of the ribs 14.

[0011]

According to the bobbin holding method of the automatic winding machine according to the present invention, a stable bobbin holding force can be obtained for a long period without deformation of the center pin, and it is possible to easily cope with a small bobbin. it can. In addition, it can be applied not only to a bobbin where the hole of the winding shaft does not penetrate, but also because it has a structure that does not take up space in the horizontal direction and the movement of the components is simple, a large number of bobbin holding parts are arranged side by side, There is also an effect that a multiple automatic winding machine can be easily configured.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the operation of a bobbin holding unit according to the present invention.

FIG. 2 is an explanatory view of the operation of the bobbin holding section of the present invention.

FIG. 3 is an explanatory view of the operation of the bobbin holding section of the present invention.

FIG. 4 is a partial cross-sectional side view of a bobbin attached to a supply table.

FIG. 5 is a front view of the same.

FIG. 6 is an exploded perspective view of a main part of a holder and a center pin.

FIG. 7 is a perspective view of a bobbin.

FIG. 8 is a partial cross-sectional side view of a conventional bobbin holding unit.

[Explanation of symbols]

 10 bobbin 11 hole 12 reel 14 rib 30 holder 32 through hole 34 protrusion 40 center pin 44 small diameter part 46 engaging part 48 groove 50 spring

Claims (1)

(57) [Claims] 1. A bobbin holding method of an automatic winding machine for winding a wire on a bobbin having a winding shaft provided with a plurality of ribs on an inner wall of the hole, wherein the bobbin has a through hole along a longitudinal direction. A cylindrical holder having a projection or a concave portion formed at the distal end portion fitted to the shaft, and an engaging portion having a diameter larger than the small diameter portion is formed at the front end of the cylindrical small diameter portion. A groove corresponding to the rib of the bobbin is formed in the periphery, and a metal center pin inserted into the through hole of the holder, the center pin moves along the longitudinal axis through the through hole of the holder. It is freely and rotatable about the shaft inside the holder, and is urged by a spring toward the holder, so that it can rotate about the shaft with the center pin and the holder integrated together. The bobbin holding part of the automatic winding machine A bobbin that can be fitted to the tip of the roller is arranged so that the hole of the reel faces the center pin,
Insert the end of the center pin that protrudes from the holder with the groove of the engaging part aligned with the position of the rib into the hole of the bobbin reel
Then, rotate the center pin by a predetermined angle and
Rib the ribs and secure with the engagement part biting into the ribs.
With the engaging pin cut into the rib and the hook
A bobbin holding method for an automatic winding machine, characterized in that a bobbin is sandwiched and held by a rudder .