GB2235217A

GB2235217A - Winding connected air-core coils

Info

Publication number: GB2235217A
Application number: GB9009155A
Authority: GB
Inventors: Youji Uchino; Akira Inomata
Original assignee: Pioneer Electronic Corp
Current assignee: Pioneer Corp
Priority date: 1989-08-23
Filing date: 1990-04-24
Publication date: 1991-02-27
Anticipated expiration: 2010-04-24
Also published as: DE4013958C2; JPH0379005A; GB2235217B; JP2829046B2; DE4013958A1; GB9009155D0

Abstract

To wind an air-core coil, side frames 17, 22 are advanced about a retractable winding core, and wire is wound about the core and between the frames which are now spaced the width of the core to be wound. Adhesive is applied to the wire at 23. When the side frames and core are retracted, the wound coil is stored in pocket behind and rotatable with the advanced core. The reset coil is then wound without breaking the wire leading to the last-wound coil. Alternatively (Figs. 5 and 6) side frame 17 is replaced by a capstan having one winding core projecting from each of its faces, each face being indexed round to face frame 22 successively. Wound coils are left on their cores, with wire running to the next coil being wound. <IMAGE>

Description

4 1.

1 -L MMTIPLY CONNECTED AIR CORE COIL WINDING APPARATUS The present invention relates to a winding apparatus for winding a multiply connected air core coil, such as a tracking coil used in an optical pickup for reading signals from an optical information storage disk. The multiply connected air core coil includes two or more air coils of a predetermined length of winding material.

Thus f ar, air core coils where two or more air coils are connected together And used as a set, such as.tracking coils, have been made by cutting a winding material whenever one air coil has been wound.

In the conventional winding apparatus, the winding material is cut whenever the winding operation for one coil is completed. This is done for the following reasons. When the air core coil is produced, the projection portion of the winding core rotates so as to wind the winding material around the projection portion of the winding core. Therefore, if the winding material is not cut bef ore the next winding step, the winding core rotates with the f irst air core coil completely wound. Thus, the air core coil which has been made is rotated and the next air core coil cannot be made. Therefore, the winding material should be cut to a predetermined length in the conventional winding apparatus. On the other hand, if a member supplying the winding material to the winding core rotates around the winding core, the winding core itself need not rotate. However, if this structure is included in the air coil core winding apparatus. the mechanism becomes extremely complicated.

Further in the conventional winding apparatus. when two or more air coils are connected and used as a set, the winding materials which have been cut must be electrically connected to terminals. Thus, it is necessary to prepare a board for soldering the terminals. Consequently. a solder process is required in addition to the board.

An object of the present invention is to solve the problems of the prior art by providing a multiply connected air core coil winding apparatus for winding an air core coil after reaching the end of a predetermined length of a winding material without cutting the winding material of a first air core coil.

The object of the present invention is accomplished by the provision of two embodiments of the present invention as described below.

In a first embodiment of the present invention, a multiply connected air core coil winding apparatus is provided comprising a winding core which can be protruded and retracted through a hole of a side frame f ace. When the winding core is protruded through the hole of the side frame face, it is thus positioned between a pair of side frames. The winding core is rotated while located between the pair of side frames so that winding material is wound on the projection portion of the winding core whereby a side f ace of an air core coil is f ormed. one side f rame is movable so as to be drawn towards and away f rom the other side frame, and a pocket is provided disposed at one of the side f rames for housing the air core coil where the winding material has been completely wound.

4 1 The side frames are provided to prevent deformation of the air core coil.

In a second embodiment of the present invention, a multiply connected air core coil winding apparatus is provided comprising a winding core which can be protruded and retracted through a hole of a side f rame f ace so as to positioned between a pair of side f rames, the winding core being rotated for forming a side face of an air core coil, similar to the first embodiment. One side f rame is movable so as to be drawn towards and away from the other side frame, and a plurality of side frame faces are provided on one of the side frames which can be rotated in a direction is perpendicular to a winding rotation shaft. One side frame is positioned so as to be opposed to the other side frame, and the winding core is protruded and retracted on the rotation shaft of the winding wire.

In the first embodiment, the winding core is protruded through a first side frame and another side frame is drawn towards the first side frame. The winding material is wound on the winding core while the winding core is located between both the side frames. After that, the winding core is retracted through the first side frame, and the air core coil where the winding material has been wound is removed from the winding core.

The air core coil is housed in the pocket without cutting the winding material. After that, the winding operation is repeated..

In the second embodiment, a first side frame is rotated in the direction perpendicular to the rotation shaft of the winding wire. A first side f rame f ace is positioned so as to be opposed to another side f rame. The second side frame is movable so as to be drawn towards and away f rom the f irst side frame face. Af ter that, the winding material is wound on the protruded winding core.

After this winding operation is completed, the side f rame is separated f rom the selected f irst side frame face. Next, the first side frame is rotated in the direction perpendicular to the winding shaft so than a second side frame face is opposed to the second side frame.

The winding operation is performed in the same manner described above. After the winding material is wound on the winding core of each side f rame face,, the winding core is retracted and the air core coil is removed.

is In the drawings:- Figures 1 to 4 show an embodiment of the first embodiment of the present invention:

Figure 1 is a perspective view of the principal section; Figure 2 is a sectional view where the principal section is assembled; Figure 3 is a front view of Figure 2; and Figure 4 is the overall front view.

Figures 5 and 6 show the principal section of a second embodiment of the present invention:

Figure 5 is a sectional view; and Figure 6 is a front view.

Referring to Figures 1 to 4, the first embodiment is described in the following.

In Figure 4, a rotation shaft 1 is rotated by a motor via a belt 2. The rotation shaft 1 is provided with a fixed pulley 3 and a slide pulley 4 which is axially movable. The rotation of the fixed pulley 3 is transferred to a pulley 8 of a shaft 7 supported by a shaft support 6 via a belt 1 1 p S. However, the rotation is not transferred to the shaft support 6 itself.

The slide pulley 4 slides on the rotation shaft I by a motion of a cylinder 9, the rotation being transferred to a pulley 12 of a shaft 11 supported by a shaft support 10 which slides along therewith.

The shaft 7 houses a winding core 13 shown in Figure 1, the winding core 13 being slid axially by a cylinder 14. The winding core 13 is rotated along with the shaft 7.

In Figure 1, a pocket body 15 is provided with an arc shape pocket 15a which houses an air core coil once a winding material is completely wound, the pocket body 15 being rotated along with the shaft 7.

The pocket body 15 has a side f rame f ace 17 at the center thereof which is fastened with a screw 16. The winding core 13 can be protruded and retracted through the side frame face 17. That is, the projection portion of the winding core 13 is projected through the hole of the side frame face 17 so that the winding material can be wound thereon. Between the side frame face 17 and the pocket body 15, a pocket cover 18 is provided with a hole 18a whose shape is nearly the same as the pocket 15a and a narrow hole 18b which is disposed at one end thereof, the pocket cover being movably mounted.

A hole 15b of the pocket body 15 houses a ball 19 and a spring 20. The ball 19 is inserted into the hole 15b and a parallel hole 18c of the pocket cover 18, each parallel hole 18c being concentrically disposed on the pocket cover 18.

By inserting the ball 19 into one of the parallel holes 18c via the pocket cover 18, the pocket 15a can be matched with the hole 18a. In is addition. by inserting the ball 19 into another parallel hole 18c, the pocket 15a can be matched with the narrow hole 18b, whereby the pocket body 15 and the pocket cover 18 can be secured in the position where the ball is inserted. The pocket cover 18 is provided with a pin 21 which is used for adjusting the length of winding material between successively produced air core coils.

As shown in Figure 4.- a side frame 22 is secured to the shaft 11. The winding material is slid on an adhesive agent rod 23, whereby an adhesive agent is applied to the winding material. After that, the winding material is guided to the winding core 13 via a guide roller 24.

In the multiply connected air core coil winding apparatus, by activating the cylinder 9, the side frame 22 approaches the side frame face 17. By further activating the cylinder 14, the winding core 13 is protruded through the side frame face 17 so as to be located between the side frame face 17 and the side frame 22.

The winding material is directed to the winding core 13 and then the rotation shaf t 1 is rotated. As a result, the winding material is wound onto the winding core 13 while the winding core 13 is located between the side frame 22 and the side frame face 17. An air core coil with side faces is made by the side frame 22 and the side frame face 17.

Before the winding material is guided by the guide roller 24, the adhesive agent is applied to the winding material by the adhesive agent rod 23. Therefore, when the winding material has been wound, the adhesive agent is hardened, thereby insulating each portion of the winding material and preventing the air core coil from being deformed.

1 J -9 - k.

Af ter a while, one air core coil has been completely wound. By activating the cylinder 9 in the reverse direction, the side frame 22 is retracted f rom the side f rame f ace 17. Af ter that, by activating the cylinder 14 in the reverse direction, the winding core 13 is retracted back into the side frame face 17.

Consequently, the air core coil can be removed from the winding core 13. By rotating the pocket cover 18, the pocket 15a and the hole 18a are matched and the pocket 15a is opened.

After the air core coil where the winding material has been completely wound is housed in the pocket 15a, by rotating the pocket cover 18 in the reverse direction, the pocket 15a is matched with the narrow hole 18b and the winding material is removed from the narrow hole 18b.

Subsequently, by performing the winding operation in the same manner as described above, since the air core coil where the winding material has been completely wound housed in the pocket 15a is rotated along with the winding core 13, the next winding operation can be performed without cutting the winding material.

By repeating the above operation, the required number of multiply connected air core coils can be successively made. However, when the next winding operation is performed, as shown in Figure 3, the length of the winding material between the air core coils can be increased by passing the winding material A to a pin 21. When a third winding occurs, for example, the first and second air core coils having been completely wound are housed in pocket 15a during the winding of the third air core coil. It should be noted that the air core coils are very small so that several air core coils can be housed in the pocket 15a.

By referring to Figures 5 and 6,, a second embodiment of the present invention is described.

In the figures, a winding shaft 30 relates to the rotation shaft 7 of the first embodiment. The side frame 22 of the first embodiment is also used in the second embodiment. The sliding and rotating operations of the second embodiment are the same as those of the first embodiment.

An L-shaped rotation frame 31 is fastened to the winding shaft 30. A shaft 32 which is rotatably disposed perpendicularly to the winding shaft 30 is mounted on the rotation frame 31.

A side frame 33 is fastened to the shaft 32, and a plurality of side frame faces 33a to 33n are disposed parallel to the shaft 32. A dent portion 33z is secured by a ball 34 and a spring 35, both of which are inserted into a hole 31a of the rotation frame 31. When the dent portion 33z is secured, one of the side frame faces 33a to 33n is positioned so as to be opposed to the side f rame 22.

Winding cores 36a to 36n are movably inserted into the side frame faces 33a to 33n so that the side frame faces 33a to 33n are concentrically disposed to the winding shaft 30 when the side frame faces 33a to 33n are opposed to the side frame 22.

A push down handle 38, which is tensioned and pushed down by a spring 37, is housed in the side frame 33, the push down handle 38 being vertically movable. When the push down handle 38 is pushed down, a slope face 38a thereof causes the winding cores 36a to 36n to be inserted into the side frame faces 33a to 33n against the elasticity of silicon rubber 39 which outwardly tensions the winding cores 36a to 36n.

P 1 f In the multiply connected air core coil winding apparatus, the side frame 33 is rotated by the shaft 32. The side frame face 33a is secured in a position opposed to the side frame 22 by the ball 34 at the dent portion 33z.

Similar to the first embodiment described above, after the side frame 22 is moved toward the side frame face 33a, the winding shaft 30 is rotated so that the winding material is wound on the winding core 36a when it is located between the side frame 33 and the side frame 22.

After the winding operation is completed..-the side frame 22 is retracted from the side frame face 33a, and the side frame 33 is rotated around the is shaft 32 in order to select a different side frame face, for example, side frame face 33b. At that time. the rotation of the side frame 33 is stopped by the ball 34, similar to the first embodiment.

In the same manner as the first embodiment, the winding material is wound around winding core 36b which is now located between the side frame face 33b and the side frame 22. By repeating this operation, after the winding material is wound on the side frame faces 33c to 33n, the push down handle 38 is pushed down.

At that time. the winding cores 36a to 36n are moved towards the silicone rubber 39. whereby the winding cores 36a to 36n are inserted into the side frame faces 33a to 33n. Consequently, the air core coils which have been wound on the winding cores 36a to 36n can be removed.

By adjusting an angle between the two successive side frame faces 33a to 33n, the length of the winding material between the air core coils can be changed.

As described above, according to the present invention, multiply connected air core coils can be wound without cutting the winding material.

Therefore, when two or more air core coils which are connected in series are used as a tracking coil in an optical pickup which reads signals from a video disk and which optically stores information, or which reads signals from an optical disk for a digital audio system called a compact disk, it is not necessary to peel the insulator -of each end of the winding material on each coil and to solder each end of the coil to joints of a board.

Thus, as well as omitting such an operation, boards and lands used for joints are not required, thereby reducing the space required for the unit where the coils are used.

In addition, the multiply connected air core coils can be wound in the same manner as the conventional coils. Thereby, it is possible to partially modify the conventional winding apparatus.

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Claims

1. Apparatus for winding multiply connected air core coils, the apparatus comprising:

first and second side frames movable relative to one another between a closed position where said side frames are spaced apart from one another a distance substantially equal to the width of an air core coil to be wound, and an open position where said side frames are further apart than when in said closed position; winding core means-haying a projection extending through one of said side frames and contacting said other side frame when said. side frames are in said closed position; means for winding a coil around said projection when said side frames are in said closed position, said side frames forming outer boundaries of said coil during winding; and pocket body means adjacent one of said side frames, said pocket body means having a pocket therein for storing at least one wound air core coil after said winding means has wound a coil on said projection and said projection is removed from the resultant air core coil.

2. Apparatus as claimed in claim 1, further comprising pocket cover means between said pocket body means and said side frame through which said projection is extended when said side frames are in said closed position, said pocket cover means including a hole generally corresponding in shape and size to said pocket but also having an additional narrow passage connected thereto.

3. Apparatus as claimed in claim 2, wherein said at least one wound air core coil is inserted into said pocket means through said hole in said pocket cover means, and a winding material is removed through said additional narrow passage.

12

4. Apparatus as claimed in any of claims 1 to 3, wherein said means for winding comprises a shaft for rotating said winding core means and wherein said pocket body means is also rotated along with said shaft.

Apparatus for winding multiply connected air core coils, the apparatus comprising: a first side frame; second side frame means for providing a second side frame during a winding operation; means for moving at least one of said first side frame and said second side frame means to a winding position wherein said first side frame and said second side frame define the width limits of a coil formed during a winding is operation; said second side frame means comprising a many faceted means having plural faces, each said face serving as a second side frame when facing said first side frame; said many faceted means being rotatable to provide any of said faces in position to face said first side frame; and projection means serving as winding cores during winding operations protruding from each said face and contacting said first side frame when the respective face faces said first side frame and when in said winding position; and rotatable support means for supporting said second side frame means and rotating said second side frame means about the axis of a said projection which is contacting said first side frame.

6. Apparatus as claimed in claim 6, further comprising means for retracting said projections following winding operations.

7. Apparatus for winding multiply connected air core coils, the apparatus comprising: a winding rotation shaft; 511 i C 13 a pair of side f rames positioned opposite to one another, wherein a f irst side frame is capable of being drawn towards and away from a second side frame and a plurality of side frame faces are located on said second side frame; a plurality of winding cores which are inserted into said plurality of side frame faces. respectively, and on which air core coils may be wound; wherein said second side frame is capable of being rotated in a direction perpendicular to said winding rotation shaft in order to select one of said plurality of side frame faces, and a selected one of said plurality of winding cores is protruded between said pair of side frames during winding and retracted after winding is complete.

8. Apparatus f or winding multiply connected air core coils. substantially as described with reference to either of the examples shown in the accompanying drawings.

b Published 1991 at 7be Patent Office. State House. 66/71 High Holborn. L4ondonWCIR47?. Further copier rnry be obtained from Sales Branch. Unit 6, Nine Mile Point, Owinfelinfach, Cross Keys, Ncwport NPI 7HZ. Printed by Multiplex techniques lid. St Mary Cray. Kent,