JPH081866B2 - Cylindrical rotary transformer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary transformer used in a VTR or the like.

[Conventional technology]

In recent years, video tape recorders (VTRs) are becoming smaller and more multifunctional. To deal with this, it is considered to use a cylindrical VTR rotary transformer instead of the conventional flat plate type.

The coil of the core must be completely housed in the winding groove formed on the inner peripheral surface of the core so as not to protrude inward from the inner peripheral surface of the core. There is a problem in that such work can be performed manually only for a long time, and efficient production cannot be performed.

Therefore, as a method for automatically mounting the coil in the winding groove provided on the inner circumference of the cylindrical core, there is disclosed in JP-A-62-54411.
The technique described in the publication is proposed.

In this technique, one or several points of the coil are deformed to the inner diameter side by a coil deformation work shaft equipped with a plurality of holding fingers so that the circumscribed circle diameter of the coil is reduced, and the deformed coil is wound around the inner circumference. Insert into the core with wire grooves, expand the deformed part of the inserted coil with the coil expansion work shaft equipped with expansion fingers, and insert the non-deformed part of the coil into the winding groove of the core. By sequentially pressing the entire circumference of the coil against the bottom surface of the winding groove by means of a press roller, a component having the coil on the inner circumference is manufactured.

[Problems to be Solved by the Invention]

However, in this technique, the coil is formed so as to match the diameter of the annular groove that is larger than the diameter of the inner peripheral surface of the core, and the elasticity of the coil is used to insert the coil into the inner peripheral surface of the core, and Since it is fitted into the wire groove, there are the following problems.

First, a jig that forms a coil to a predetermined diameter, a jig that holds the coil wound on the jig from the outside, a jig that deforms the held coil inward and inserts it into the core, A jig for enlarging the formed coil and a jig for sequentially pressing the coil are required. Not only many jigs are required, but also the number of steps is large.

In addition, when the coil is expanded in the core and then sequentially pressed against the winding groove by a roller or the like, the coil may be deformed. In particular, since the coil is deformed in order to reduce the circumscribed circle diameter of the coil before it is inserted into the core, the deformed portion may not be completely restored and may be bent.

Further, since the coil is formed in conformity with the winding groove of the core, when the coil is inserted into the core, it is necessary to divide the coil into a deformed portion and a non-deformed portion and largely deform the deformed portion. Moreover, the jig for that becomes complicated.

An object of the present invention is to provide a cylindrical rotary transformer that can be assembled in a short time with a small number of steps.

Another object of the present invention is to provide a cylindrical rotary transformer to which a simple jig can be used and a simple and economical winding mounting method can be applied.

Still another object of the present invention is to provide a cylindrical rotary transformer which is fixed to the winding groove of the core uniformly without being deformed after being wound around the inner circumference of the core.

[Means for solving the problem]

In order to achieve the above object, the present invention is one in which the wire diameter of the winding portion of the coil mounted on the inner circumference of the cylindrical core of the cylindrical rotary transformer is different from the wire diameter of the terminal wire portion.

Further, in order to achieve the above object, the present invention has a coil in which an arcuate shape and a linear shape are connected to each other at a position on an inner circumference of a cylindrical core of a cylindrical rotary transformer.

[Action]

The wire diameter of the winding portion of the coil mounted on the inner circumference of the cylindrical core of the cylindrical rotary transformer was made different from the wire diameter of the terminal wire portion. Further, a coil in which an arcuate shape and a linear shape are connected is attached to a position on the inner circumference of the cylindrical core of the cylindrical rotary transformer.

As a result, it is possible to assemble in a short time with a small number of steps, use a small number of jigs, and use a simple and economical winding mounting method. Further, after winding on the inner circumference of the core, there is no deformation such as bending, and it is possible to fix the core uniformly in the winding groove.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

Fig. 2 shows a VTR cylinder 1 with a cylindrical rotary transformer.
It shows the tape running system of the VTR incorporated in. The VTR cylinder 1 is constructed as shown in FIG. 3, in which the rotary transformer 7 is provided with a cylindrical core 10 having a coil wound around its inner periphery as shown in FIGS. 4 and 5. There is.

First, in FIG. 2, 1 is a VTR cylinder, 2 is a tape, and 3 is a cassette case. Here, the rotary transformer 7 in the VTR cylinder 1 sends an electric signal corresponding to the video signal of the tape 2 taken out by the upper cylinder 4 as shown in FIG. It is intended to be transmitted to. In FIG. 3, 6 is a head.

Further, in the rotary transformer 7, the cylindrical core (rotor) 10 attached to the rotating upper cylinder 4 side is
As shown in FIGS. 4 and 5, a winding groove 11 for mounting a coil 13 as shown in FIG. 14 is formed in the inner circumferential direction. Further, a lead-out groove 12 for accommodating the terminal wire of the coil is provided in a direction orthogonal to the winding groove 11.

In FIG. 4, another cylindrical core (stator)
9 is attached to the lower cylinder 5 side, and a coil is attached to the outer periphery of the core. Further, 8 is a pin around which the terminal wire of the coil 13 is wound.

As a winding method for assembling such a coil 13,
A method realized by the cylindrical core 10 and the coil holding jig 20 'for mounting the coil 13 on the cylindrical core 10 as shown in the figure will be described.

First, a method of winding a coil holding jig and a method of drawing a terminal wire will be described with reference to examples.

6 (A) to 6 (F) show the steps from the winding of the coil to the mounting of the coil on the cylindrical core 10.
First, FIG. 6 (A) shows a coil holding jig 20 'before winding. In the initial state, the coil holding jig 20 'is
21 is closed by an opening / closing mechanism 22. The jig 20 'has
In addition to this, there are provided a wire hook 28 for holding one end of the wire 24 in the winding wire, and an end hook 29 for temporarily holding the terminal wire of the winding wire after forming and styling. Further, a coil guide 25 is provided on the outer circumference of the pusher 21 in which a groove having a width capable of mounting a winding is formed.

FIG. 6 (B) shows a process in which one end of the wire 24 is hooked on the wire hook 28 and wound around the coil guide 25.

FIG. 6C shows the coil 13 after the terminal wire is styled. That is, the coil guide 25 is wound, and the terminal wire is hooked on the end hook 29 from a state where the terminal wire is cut into a predetermined length, so that the terminal wire is inserted in the lead-out groove 12 of the cylindrical core 10. Shape.

FIG. 6D shows a state in which the coil holding jig 20 'is inserted into the core 10 and positioned.

FIG. 6 (E) shows a state in which the pusher 21 is expanded in the radial direction from the positioned state and the winding is pressed onto the winding groove 11 of the cylindrical core 10 on the outer periphery of the pusher 21. FIG. 13 shows the relationship between the pusher 21 and the wire 24 at that time.

FIG. 6 (F) shows a state in which the winding is completed in the winding groove 11 of the cylindrical core 10 and the coil holding jig 20 'is pulled out and taken out.

Next, regarding the apparatus for carrying out these steps,
It will be described with reference to FIGS.

First, FIG. 7 is a perspective view showing an example of an apparatus applied to this embodiment, and FIG. 8 is a front view of the apparatus shown in FIG. Further, FIGS. 9 to 13 are explanatory views for explaining the details of each part.

As shown in FIGS. 7 and 8, the inner circumference winding mounting apparatus in the embodiment shown in these figures performs a winding, and a coil holding jig 20 'for holding the winding and a coil holding jig for the coil holding jig 20'. Ingredient
An expansion mechanism section 30 for opening and closing 20 ', a motor section 40 for rotationally positioning the coil holding jig 20' and the expansion mechanism section 30, and an end of the winding wound on the coil holding jig 20 '. Forming guide part 50 for processing the wire, solvent applying part 60 for applying a solvent to the forming part of the winding to fix the forming shape, and core holding part for holding and fixing the cylindrical core 10. 70 , a core positioning section 80 for positioning the core holding section 70 in the left-right direction, and a control device (not shown) for controlling each operation.

The coil holding jig 20 ′ has a pusher 21 for winding the wire 24 and mounting it on the cylindrical core 10, and an end hook 29 for temporarily holding the terminal wire of the winding after forming and styling. And a wire hook 28 that holds one end of the wire 24 in the winding.

Here, the pusher 21 is divided into a plurality of (for example, four) pusher pieces 21 ′ as shown in FIG. 9, and the wound coil is directly attached to the winding groove 11 of the cylindrical core 10. It is designed to be pushed in, and the part to be wound (coil guide 2
As shown in Fig. 10, a groove 251 is formed on the outer circumference of the pusher 21 and has a width that allows windings to be mounted, and on both sides of the groove 51, a winding guide with a height of about 1/2 of the wire diameter is formed. It has 252.

The end hook 29 is provided on the end surface of the pusher 21 so that the end of the wire rod 24 after the winding to the outer peripheral portion of the coil holding jig 20 ′ can be mounted in the drawing groove 12 of the cylindrical core 10. It is for taking style and holding it temporarily.

Further, since the wire hook 28 is located near the root of the pusher 21 and is attached to the pusher 21, it is synchronized with the rotation of the pusher 21. Further, it is located in the outer peripheral direction from the center of the pusher 21, and its diameter is a position where it does not interfere even when the core holding part 70 is slidably moved and positioned at the coil holding jig 20 '. Is wire
A hook 281 (Fig. 9) for hooking the starting end of 24 is provided.

The expansion mechanism section 30 is a claw section to which the pusher 21 is attached.
31 and an air chuck 32 that gives opening and closing motion to the claw portion 31
And the stopper 39 for adjusting the opening / closing amount, and the air check
Air feed pipe 33 to supply driving air to 32
A flange 34 for holding the air check 32, a timing pulley 36 attached to the flange 34 for receiving the rotational force of the motor section 40 by the timing belt 35, and a bearing 37 for smoothing the rotation of the flange 34. , A bracket 38 for holding these expansion mechanisms 30.

Here, the claw portion 31 holds the root of the pusher 21, and the wire rod 24 wound on the outer periphery of the pusher 21 by the opening / closing operation of the air chuck 32 is provided in the winding groove 11 and the drawing groove 12 of the cylindrical core 10. It is something to wear.

The air check 32 is opened and closed by supplying a predetermined pressure of air, and is of a rotary type capable of continuously supplying air even if the check is rotated.

The stopper 39 adjusts the winding diameter when the pusher 21 is closed and the mounting diameter when the pusher 21 is expanded, by abutting on the claw portion 31, and by adjusting each of the inner diameter of the cylindrical core 10. Different types and different depths of the winding groove 11 can be accommodated.

The air feed pipe 33 supplies driving air to the rotary air chuck 32. The air feed pipe 33 is fixed to the air chuck 32 and can supply air without being affected by its rotation.

The flange 34 holds the end surface of the air chuck 32 on the side opposite to the claw portion 31, and has a hole for passing the air feed pipe 33 in the center thereof, and a timing pulley 36 and a bearing 37 are attached to the outer periphery thereof. The axis processing for is done.

The motor unit 40 rotates the timing pulley 42 by the rotation of the motor 41 and rotates the flange 34 of the expansion mechanism unit 30 via the timing belt 35.
It consists of a bracket 43 which holds these motor parts 40.

The forming guide section 50 holds the forming guide 51 and the forming guide 51 for preventing the wire 24 from being lifted when the style 24 is pressed down from above the wire 24 wound around the outer circumference of the pusher 21. A guide plate 52 to hold, a stopper 53 attached to the guide plate 52 for limiting the lowering of the forming guide 51, and a stopper 53.
An adjuster 54 for adjusting the descending amount by abutting against the air cylinder 55 and an air cylinder 55 for vertically moving the forming guide 51.
A linear guide 56 that serves as a guide when moving up and down, a block 57 that holds the forming guide portion 50 , and a bracket 58 that supports the block 57.

Here, the forming guide 51 has the same thickness as the diameter of the wire rod 24 as shown in FIG. 11,
When the terminal wire of the wire rod 24 is styled, it can have an appropriate curvature at its bending point and can be accommodated within the width of the drawing groove 12 of the cylindrical core 10. In the portion of the forming guide 51 that comes into contact with the wire 24,
A groove 251 formed on the outer periphery of the pusher 21 as shown in FIG.
The wire guide 24 on both sides of the wire 24 wound around
The slits enough to accommodate 2 are cut, and the depth thereof is almost the same as the diameter of the wire 24. With this slit, when the style of the wire rod 24 is removed, the wire rod 24 can be sufficiently pressed down, so that the wire rod 24 can be prevented from rising.

The solvent coating unit 60 is for bonding between the wires of a self-bonding wire rod, a nozzle 61 for dropping the solvent onto the wire rod 24, and a syringe for supplying the stored solvent to the nozzle 61. 62, a concave plate 63 for fixing the syringe 62, a fixing plate 64 for fixing the syringe 62 by the concave plate 63, and a lowering of the syringe 62 attached to the fixing plate 64. Stopper 65 for operating, an adjuster 66 for contacting the stopper 65 and adjusting the descending amount, an air cylinder 67 for vertically moving the syringe 62, and a linear guide 68 that serves as a guide when vertically moving. A block 69 for holding the solvent coating section 60 , and a bracket 69 for supporting the block 69.
Made of one.

The core holding portion 70 includes a core holder 71 for inserting and holding the cylindrical core 10, a holder plate 72 for holding the core holder 71, a holder plate 72 mounted on the holder plate 72, and positioning the core holder 71 in the rotational direction. Dome 73 and cylindrical core 10
To the pusher 21 and eccentric in the vertical direction, the upper guide 74 and the lower guide 75, the L-shaped metal fitting 76 attached to the upper guide 74 side, and the T-shaped metal fitting 77 attached to the lower guide 75 side. , A preload spring 78 for holding the L-shaped metal fitting 76 against the T-shaped metal fitting 77, a preload bolt 79 attached to the T-shaped metal fitting 77 in the preload spring 78, and the core holding portion 70 are supported. It consists of a bracket 721.

The core positioning portion 80 is installed on the plate 81 for mounting the core holding portion 70 , and is installed on the plate 81 to eccentrically move the cylindrical core 10 in the vertical direction via the T-shaped metal fitting 77 of the core holding portion 70. Jig cylinder 82 and core holder
A linear guide 83 that serves as a guide when moving the 70 to the pusher 21, a core positioner 84 that is attached to the side surface of the linear guide 83 and is fed in accordance with the pitch of the winding groove 11 of the cylindrical core 10, To prevent a collision at the foremost end when the spring plunger 85 that contacts and presses the groove of the core positioner 84 for positioning, the holder 86 for holding the spring plunger 85, and the core positioning portion 80 moves forward. It consists of the Stupa 87.

As shown in FIG. 7, when the wire rod 24 is wound around the outer circumference of the pusher 21 of the coil holding metal fitting 20 ', the wire rod preliminary guide 91 for guiding the wire rod 24 into the winding groove 251 is a pusher rod.
It is located in the circumferential direction of the winding groove 251 of 21 and the core holding portion 7
It is installed at a distance that does not interfere with moving 0 to the left.

In this embodiment, due to the malleability of the wire rod 24 used for the coil 13, the coil diameter is increased and the coil 13 is mounted.

Figure 12 shows the elongation-load diagram of the copper wire used as a wire rod. As shown in FIG. 12, when the elongation of 0.5% or more occurs, the elastic region shifts to the plastic region.

Even if the copper wire alone expands by about 20%, the problem of breakage does not occur, but considering peeling of the coating and breakage that cause short circuits in the circuit, the expansion from the winding diameter to the expanded diameter is 3 to 5%
The degree is desirable. When further spreading is required, the wire material is forcibly fed from the terminal wire side and is restrained to a predetermined elongation to prevent the occurrence of defects.

In this manner, the coil 13 can be attached to the winding groove 11 on the inner circumference of the core 10 by giving the wire material an extension in the range of the plastic region to the extent that the coating is not peeled off. Also,
After the mounting, the coil 13 does not return even if the jig 20 is pulled out from the core 10.

In the above description, the method of manufacturing the cylindrical rotary transformer in which the plastically deformed wire is wound around the inner circumference of the core has been described. Next, the coil wound in the cylindrical rotary transformer will be described.

FIG. 1 shows a cylindrical rotary having a cylindrical core 10 in which a coil 13 having different wire diameters b and c in the winding portion and a wire diameter a in the terminal wire portion is attached to the inner circumference by the method shown in FIG. It is a transformer. The wire diameters b and c of the winding portion are 80 to 99.5% of the wire diameter a of the terminal wire portion.

This occurs because, as shown in FIG. 6, elongation is imparted only to the wire rod in the portion mounted on the inner circumference. By setting this elongation in the plastic region, it is possible to prevent the wire rod from being bent or dislocated after the coil is mounted.

Fig. 15 shows wire diameters b ₁ and b ₁ ′ and b ₂ and b ₂ ′ at the same position on the circumference in a winding part having two or more turns.
B ₂ and the diameter is equal respectively, or approximately equal, or the relative change tendency b ₁ of the wire diameter, the relative b ₁ '
This is a cylindrical rotary transformer 10 in which a coil 13 having an equal or approximately equal ratio of b ₂ ′ is mounted on the inner circumference.

The change ratio of the wire diameter here is a function of the elongation of the wire. That is, the change ratio of the wire diameter is 80 to 99.5.
%, The use of copper wire in the plastic range of 0.5 to 20% is used, as shown in FIG.

As shown in FIG. 13, the expansion rate of the wire rod depends on the wire diameter b at the clearance of the expansion tab 21 and the wire diameter c at the center of the expansion tab 21.
In this way, it corresponds to the positional relationship with the expansion claw 21. In this case, the clearance of the expansion claw 21, that is, the elongation of the wire between the claws is remarkable, and the wire diameter b of this part tends to be smaller than the wire diameter c.

The reason why it appears as such a shape is that it is possible to apply a method in which the expansion tab 21 is wound in a closed state, inserted into the cylindrical core 10, and then the expansion tab 21 is opened and mounted.
In this case, if the winding diameter is φ16 mm and the mounting diameter is φ16.8 mm, the difference (5.0%) is the elongation of the wire. Therefore,
With this average elongation (5.0%) as the center, the elongation (wire diameter) varies depending on the location of the coil portion or the location on the circumference (for example, the portions of wire diameters b and c). As a matter of course, the degree of extension becomes equal at the same position on the circumference in a winding having two or more turns, and the change tendency of the wire diameter becomes the same. Thereby, it is possible to make the magnetic characteristics uniform.

As shown in FIG. 13, in the clearance portion of the expansion claw 21, the wire rod expands linearly, but the expansion claw has an arc shape.
If you install it so that the draw-out groove 12 of the circumferential core 10 is arranged in the central part of 21, you can hold the draw-out line,
It is possible to prevent the leader line from floating. In this case, the shape of the coil wound on the inner circumference is divided into an arc-shaped portion and a straight (chord) -shaped portion, and alternately arranged, as shown in FIG.

According to this embodiment described above, since it is not necessary to use an adhesive during winding or mounting of the winding, it is possible to prevent a device trouble due to the influence of the adhesive and improve the operation rate of the device. is there.

In the above description of the winding process, the coil holding jig is used both for winding the wire, inserting it into the core, and mounting it on the inner circumference of the core. However, instead of using one jig, wire winding is performed using another jig, and the wound coil is inserted into the core through the mounting jig and opened in the radial direction to mount. Good. In short, even if one jig or multiple jigs are used, the outer circumference of the coil mounted on the inner circumference of the core is larger than the outer circumference of the coil wound on the jig. Then, the coil can be expanded by a jig.

〔The invention's effect〕

According to the present invention described above, the cylindrical rotary transformer can be assembled in a short time with a small number of steps, so that the working time can be shortened.

Further, according to the present invention, since an economical winding method can be applied with a simple configuration and a small number of jigs to be used, it is possible to prevent defects caused by handling between jigs.

In addition, since the wire is plastically deformed, the coil can be evenly mounted in the winding groove of the core, and lifting can be prevented.

Further, since the adjacent winding portions have the same elongation, it is possible to make the magnetic characteristics uniform and the leader line can be pressed by the arcuate portion.

[Brief description of drawings]

1 and 15 are partially cutaway perspective views of a cylindrical rotary transformer according to the present invention with a coil attached, FIG. 2 is a schematic view of a tape running system of a VTR, and FIG. FIG. 4 is a sectional view of the cylinder, FIG. 4 is a view for explaining the structure of the rotary transformer, and FIG. 5 is a partially cutaway perspective view of the cylindrical core.
6 (A) to 6 (F) are process explanatory diagrams of a winding mounting method for carrying out the present invention, and FIG. 7 is a perspective view showing a winding mounting device for carrying out the method of FIG. FIG. 8 is a front view of the apparatus shown in FIG. 7, FIG. 9 is a view for explaining a winding state on the pusher, FIGS. 10 and 11 are explanatory views of the forming guide, and FIG. A diagram showing the relationship between the elongation and the load of the copper wire as the wire material of the coil, FIG. 13 is a diagram for explaining the state in which the pusher is opened, and FIG. 14 is a diagram showing the shape of the coil to be mounted. is there. 10 …… Cylindrical core, 11 …… Winding groove 12 …… Drawing groove, 13 …… Coil 20 …… Coil holding jig, 21 …… Pusher 22 …… Opening / closing mechanism

Claims (9)

[Claims] 1. A cylindrical rotary transformer in which a coil having a wire diameter different from that of a winding wire portion and a terminal wire portion is mounted on the inner circumference. 2. The wire diameter of the winding portion has a portion of 80 to 99.5% of the wire diameter of the terminal wire portion.
The cylindrical rotary transformer described. 3. A cylindrical rotary transformer having a coil, which is in a plastic region where the elongation of a wire is 0.5 to 20%, mounted on the inner circumference. 4. A cylindrical rotary transformer characterized in that a coil, in which the coated wire is stretched to such an extent that the coating does not peel off within the range of plasticity, is mounted in the winding groove of the inner circumference of the core. . 5. A cylindrical rotary transformer having, on its inner circumference, a coil in which an arcuate shape and a linear shape are connected to each other at a position on the circumference of a winding part. 6. The cylindrical rotary transformer according to claim 5, wherein the coil in which the arcuate shape and the linear part are connected is a set of coils formed by windings having a plurality of turns. 7. A set of a plurality of turns of a plurality of turns, each of which has the arcuate shape and the linear shape, are mounted at different positions on the circumference of the winding portion. Item 7. A cylindrical rotary transformer according to item 6. 8. An inner circumference of a core of a set of coils of a plurality of turns of a series of arc-shaped and straight-lined parts, wherein the arc-shaped part of the set of coils is already attached. The cylindrical rotary transformer according to claim 7, wherein the cylindrical rotary transformer is configured to be housed in the winding groove of the. 9. The cylindrical rotary transformer according to claim 5, wherein a lead wire groove is arranged in the arc-shaped coil portion.