JPS6327284Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is applicable to, for example, a video tape recorder (hereinafter referred to as
The present invention relates to a rotating transformer core mounting device suitable for use when fixing a rotating transformer used in a head drum mechanism of a VTR (referred to as a VTR).

Generally, in a rotating head type VTR, video signals are transferred from the rotating magnetic head (video head) to a primary coil (rotor) wound around a core attached to the rotating side, and fixed at a predetermined distance from the primary coil (rotor). A so-called rotary transformer having a secondary coil (stator) wound around a core placed on the side is used, and the two coils are magnetically coupled. Conventionally, this rotating transformer core is arranged in a head drum mechanism as shown in FIG. 1, for example. That is, in FIG. 1, 1 is the rotation axis, 2,
3 is a bearing that rotatably supports the rotating shaft 1;
4 is a bearing housing, 5 is a fixed drum located on the lower side (lower drum), 6 is a fixed drum located on the upper side (upper drum), 7 is a rotating flange attached to the rotating shaft 1, 8 is a rotating flange 7 The mounted rotary disk includes a rotary magnetic head 9, a drum support member 10 for fixing the fixed drums 5 and 6, and a positioning screw 11. 12 is a rotor of a rotating transformer fixed to the rotating flange 7 with an adhesive or screws; 13 is a stator of a rotating transformer similarly fixed to the stationary drum 5 with an adhesive or screws; 14 is a bearing nut for preload adjustment;
5 is a stator of a motor mounted on the end of the fixed drum 5; 16 is a rotor of the motor provided at one end of the rotating shaft 1 in correspondence with the stator 15; and 17 is a nut.

However, in the case of the conventional head drum mechanism as described above, the rotary transformer is attached to the mounting base, that is, the fixed drum 5 or the rotary flange 7, using adhesive or screws as described above, which causes various inconveniences as follows. . That is, the method using an adhesive has disadvantages in that it has a weak ability to hold the rotary transformer in close contact with the mounting base, requires a large amount of man-hours, and has poor reliability against temperature changes and the like.

In addition, the method using screws has disadvantages such as poor space factor and the core of the rotating transformer cracking if the screws are tightened too much, and the screws loosening if the screws are weakened.

In view of these points, the present invention maintains the close contact of fixed members such as rotating transformers to the mounting base, improves the reliability of the holding force against ambient conditions such as heat, shock, and vibration, and reduces the number of man-hours. The present invention provides a rotating transformer core mounting device with excellent productivity.

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

In FIG. 2, B is a mounting base, C is a fixed member placed on the mounting base B, such as the core of a rotating transformer, and L is a coil embedded and wound in this core C.
S is a support member that is press-fitted into the recess H of the mounting base B and supports the rotary transformer, and this support member S has a predetermined angle, e.g., approximately It has a flange F that slopes at an angle of about 15 degrees.

Next, when assembling, first, the core C of the rotary transformer is placed on the mount B and positioned, and then the support member S is press-fitted into the recess of the mount B, and the core C of the rotary transformer is inserted between them. Then, when the mounting member S is pushed in from above in the drawing with a force stronger than the pressing force, the collar F is deflected, and the rotary transformer is closely fixed to the mounting base B by this deflection.

FIG. 3 is a longitudinal sectional view showing the entire head drum mechanism when the present invention is applied to fixing the rotor of a rotary transformer to a mounting base. In Figure 3, 2
1 is a rotating shaft; 22 and 23 are bearings that rotatably support the rotating shaft 21; 24 is a bearing housing; and 25 is a first fixed drum (lower drum);
5 is substantially formed therein. To assemble these parts, first press fit the bearing 22 into the housing 24 from above in the drawing.
The rotating shaft 21 is press-fitted into the inner ring of the bearing 22 from the top and bottom directions in the drawing. and bearing holder 26,
27, the preload spring 28 is inserted into the housing 24 from below, and then the bearing 23 is press-fitted from below. As a result, a predetermined preload is automatically applied by the spring 28. Finally, inject adhesive from the injection hole 29 to fix the bearing 23 to the drum 2.
5 to obtain fixed position preload.

Reference numeral 30 denotes a rotating flange, which is press-fitted and fixed to the rotating shaft 21. This rotating flange 30 corresponds to the mounting base B in FIG. 31 is a rotor of a rotary transformer corresponding to the core C and coil L portion of FIG. 2, and 32 is a rotary transformer holder corresponding to the support member S of FIG. After that, the holder 32 is press-fitted into the rotating flange 30, and the flange part (second
The rotor 31 is clamped by the collar (corresponding to the collar F in the figure), and the rotor 31 is fixed to the rotating flange 30. 33 is fixed to the bottom of the rotating flange 30, and PG
A PG yoke in which a plurality of (pulse generator) magnets are embedded; 34 is a head relay board attached to the top of the rotating flange 30; 35 is a rotating disk fixed to the side of the rotating flange 30;
36 is a head base, and 37 is a rotating magnetic head (video head). A plurality of screw holes (not shown) are bored in the rotary disk 35 at equiangular positions on the same circumference of the contact plane with the rotary flange 30.
When replacing the video head 37, insert a screw into each screw hole, butt it against the rotating flange 30, and gradually tighten each screw. This allows even if the rotating disk 35 and rotating flange 3
Even if the fitting part 0 is firmly fitted, the rotating disk 35 can be smoothly removed from the rotating flange 30 and the video head 37 can be replaced.

39 is a stator of a rotating transformer provided on the fixed drum 25 so as to correspond to and magnetically couple with the rotor 31 of the rotating transformer; 40 is the fixed drum 2;
PG coil arranged on 5, 41 is fixed drum 2
5, a drum support member 42 is attached to a drum mounting bracket, and 43 is a second fixed drum (upper drum). Installed. Although not shown in the drawings, each of the drum mounting bracket 42 and the drum support member 41 has a tapered hole and a threaded hole drilled in the axial direction so as to be offset by a minute dimension from each other, and taper screws are inserted into these holes. By tightening the fixed drum 43, the fixed drum 43 is brought into close contact with the drum support member 41. This makes it possible to reassemble the fixed drum 43 only from the top when replacing the video head, improving workability (serviceability) and eliminating the need to take up extra space on the drum support member 41 side. Miniaturization becomes possible.

Further, it is desirable that the minute amount of protrusion of the upper fixed drum 43 relative to the lower fixed drum 25 on the tape running surface is uniform. Therefore, the diameter of the fixed drum 43 is increased by about twice the appropriate amount of protrusion.
The drum support member 41 is provided with a stepped portion corresponding to the protrusion so that the upper and lower drums can be attached to the drum support member 41. As a result, the centers of both drums are aligned, so that the amount of protrusion of the upper fixed drum 43 can be made constant at any position on the tape running surface, and stable tape running can be ensured.

Further, 47 is a tape press holder attached to the fixed drum 43, and 48 is a tape press holder 47.
This is a tape holding tip that is attached to the tape so that it can move elastically up and down.

49 is a motor rotor boss attached to the lower end of the rotating shaft 21 with a nut 50, 51 is a motor magnet case fixed to the boss 49, and 52 is a motor magnet placed in the case 51. The parts constitute a rotor 53 of a flat motor. 54 is a motor stator base plate attached to the bottom of the fixed drum 25; 55 is a flexible printed circuit board attached to a metal plate 56 provided below the base plate 54 with a shield case 60 interposed therebetween; 57 is a motor coil electrically connected to the circuit pattern of the printed circuit board 55; 58;
is a motor printed circuit board mounted on the base board 54, each circuit pattern of the printed circuit boards 55 and 58 is electrically connected to the printed circuit board 58.
The power supply lead wire of the motor is taken out even though it is not shown. These parts 54 to 58 constitute a stator 59 of the flat motor. This motor is designed to be attachable and detachable from the outside for ease of maintenance and service.

61 is a drum printed circuit board attached to the bottom of the fixed drum 25, and this printed circuit board 6
Stator 39 of the rotating transformer in the circuit pattern 1
The side coil and the PG coil 40 are electrically connected, and a video signal lead wire and a rotational phase signal lead wire (not shown) are taken out from the printed circuit board 61.

As described above, according to the present invention, the member to be fixed, such as the rotating transformer, is fixed by the mounting member with a flange that is press-fitted into the mounting base, so the installation is easy and the number of man-hours is reduced, and it is easy to attach the member to be fixed. Sufficient adhesion to the table is maintained, and the reliability of the holding force against ambient conditions such as heat, shock, and vibration can also be improved.

In the above description, the rotor part of the rotary transformer is fixed to the mounting base as the member to be fixed, but it goes without saying that the present invention can be similarly applied to the stator part of the rotary transformer. For example, if the stator 39 of the rotating transformer in FIG. 3 is to be fixed to a mounting base, that is, to the stationary drum 25 in this case, a step is provided inside the core of the stator 39 by a predetermined amount lower than the surface adjacent to the rotor 31. A groove is drilled into a part of the fixed drum 25 that corresponds to the step in the axial direction, into which a support member with a flange can be press-fitted like the holder 32, and the support member is press-fitted into this groove so as not to come into contact with the holder 32 on the rotor 31 side. The stator 39 may be fixed to the fixed drum 25 by the collar. Alternatively, steps may be provided inside both the rotor 31 and stator 39 and support members may be press-fitted as described above, or the diameters of the cores of the rotor 31 and stator 39 may be made different while maintaining the coupling relationship between the coils. The structure may be such that the supporting members that are clamped do not come into contact with each other.

As described above, according to this invention, the collar of the support member can be held in close contact with the rotary transformer cores constituting the rotor and stator, which operate in opposition to each other, and the collar of the support member of either the rotor or the stator can be held tightly. It is possible to prevent the stator from touching the other stator or rotor, and it is also possible to improve the reliability of the holding force against ambient conditions such as heat, shock, vibration, etc. Moreover, it is possible to reduce the number of man-hours and improve productivity. effect can be obtained.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view showing an example of a conventional mechanism;
The figure is a cross-sectional view showing one embodiment of the present invention, and FIG. 3 is a longitudinal cross-sectional view showing an application example of the present invention. B is the mounting base, C is the core of the rotating transformer, S is the support member, F is the collar formed on the outer peripheral edge of one side of the support member S, 21 is the rotation shaft, 25 is the first fixed drum, 30 is the rotation flange, 31 is a rotor, 32 is a rotating transformer holder, 35 is a rotating disk, 37
39 is a rotating magnetic head, 39 is a stator, 52 is a motor magnet, 53 is a rotor, and 57 is a motor coil.

Claims (1)

[Scope of utility model registration request] A first rotating transformer core that is in contact with one side of a rotating body that is fixed to a fixed drum or a rotating shaft rotated by a motor and has a magnetic head provided at a predetermined position; a cylindrical support member that is press-fitted into a mounting portion provided on the stationary drum or the rotary body that is in contact with the stationary drum, and has a flange inclined at a predetermined angle on one side of the outer periphery; The first rotary transformer core faces the first rotary transformer core fixed by the support member and is arranged so as not to come into contact with the second rotary transformer core fixed to the other of the fixed drum or the rotating body. A stepped portion is provided in the core, or a notch is provided in the second rotary transformer core, and the collar is brought into contact with the first rotary transformer core, so that the fixed drum of the first rotary transformer core or the above A rotating transformer core mounting device characterized by fixing it to a rotating body.