JPH0544743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to, for example, an audio or video tape recorder device, and more particularly to a mounting structure for a motor that rotationally drives a capstan.

Background technology and its problems In tape recorder devices, compactization,
In particular, in order to achieve compactness through thinning, the size of the main body, which includes the rotor, stator, etc. of the motor that rotationally drives the capstan, becomes an important issue. However, in the past, there have been examples of using cylindrical motors with smaller diameter motor rollers, etc., in a direction perpendicular to the axis of rotation, and with the aim of reducing the size of the main body. Due to problems such as torque, there are limits to miniaturization. For this purpose, it is conceivable to eliminate the thickness of the main body portion in the direction of the rotational axis and to create a flat type motor.
However, on the other hand, there is a problem in how and where in the device the main body of the motor, which is flat, should be accommodated.

Purpose of the Invention The present invention was invented in view of the above circumstances, and its purpose is to provide a tape recorder device that uses a flat type motor and can be made more compact. It is.

Summary of the Invention A tape recorder device according to the present invention includes a flat motor as a motor for rotationally driving a capstan, and a rotor of the flat motor is arranged to rotate concentrically with a supply reel stand. It is characterized by this.

Therefore, by using a flat motor and arranging this motor on the supply reel stand side that does not have a slip mechanism, and in such a way that the rotor of the motor and the reel stand rotate concentrically, The device can be made even more compact.

Embodiment Next, an embodiment in which the tape recorder device according to the present invention is applied to an audio tape recorder device will be described based on the drawings.

First, in FIG. 1, 1 is a tape cassette which is a compact cassette, and 2 is a mechanical board. On this mechanical board 2, a capstan 3,
A pinch roller 4, guide pins 5, 5, reproducing head 6, etc., which are opposed to this, are arranged and attached as appropriate. Further, a pair of openings 7 and 8 are formed in the mechanical board 2.

A take-up reel claw 9 that engages with the take-up reel hub 1A of the tape cassette 1 is disposed in the center of one opening 7.

As shown in FIG. 2, this take-up reel pawl 9 is arranged on the inside of the lower stage of the double layered structure of upper and lower layers, and is placed at the center of the take-up reel stand 10 made of synthetic resin. It is provided by being fitted into a tubular protrusion 10a that is integrally formed with and protrudes upward through a through hole 11 that penetrates in the vertical direction. Note that the rotating wheel 12 arranged on the outside of the upper stage and having an inverted dish shape is a circular metal plate 12.
a, a gear tooth ring member 12b made of synthetic resin that fits on the outer periphery of the metal plate 12a and has gear teeth carved in the circumferential direction thereof, and a molding means in a central hole 12c formed in the metal plate 12a. The tubular protrusion 10a is inserted into the hollow part of the ring body 12d, and the take-up reel stand 10 and the rotating wheel body 12 are separated from each other. It is rotatably provided.
Between the take-up reel stand 10 and the rotating wheel 12, a friction plate 13 made of ring-shaped felt or the like is provided concentrically and bonded to the lower surface of the rotating wheel 12. The rotating wheel body 12 is fitted into the tubular protrusion 10a, and is pressed toward the take-up reel stand 10 by the elastic biasing force of a coil spring 14 interposed between the take-up reel pawl 9 and the rotating wheel body 12. energized. Further, the take-up reel stand 10 including the take-up reel pawl 9 and the rotary wheel body 12 are rotatably supported by a support shaft 15 . However, the upper end 15a of this support shaft 15 is inserted into the through hole 16 of the tubular protrusion 10a, and the lower end 15b is a tubular body fixed to a hole 18 formed in the motor board 17 by caulking or the like. It is press-fitted and fixed into the hole 20 of No. 19. Note that 21 is a first intermediate rotating body which will be described later, and E1 is an E ring fitted into a groove of the support shaft 15 to prevent the take-up reel stand 10 and the like from coming off.

On the other hand, in the center of the other opening 8, as shown in FIG.
A supply reel pawl 23 made of synthetic resin is fixed to the upper center and engages with the supply reel hub 1B of the tape cassette 1.

Similarly to the rotating wheel body 12, this supply reel stand 22 is composed of a metal plate 22a and a gear tooth ring member 22b, and has an opening 24 formed at the center thereof, that is, at the center of the metal plate 22a. ,
A supply reel pawl 23 is also fixedly provided by molding means. The interior of the supply reel pawl 23 is hollow, and a hollow portion 23a communicating with the bottom of the supply reel stand 22 is formed.

By the way, below the supply reel stand 22, as shown in FIG. 3, one capstan driving motor M attached to a motor board 17 is disposed. This motor M is constituted by a flat type brushless motor in which the main body, which is composed of a rotor, a stator, etc., has no thickness in the direction of its rotational axis and is flat.

Next, regarding the capstan drive motor M,
This will be explained with reference to FIGS. 3 and 4.

The motor board 17 has a circular bulge 1
7a is positioned in the inverted dish-shaped supply reel stand 22 so as to be fitted from below. A cylindrical bearing retaining sleeve 27, which extends vertically and has a through hole 26 formed vertically, is caulked to the opening 25 formed in the center of the bulging portion 17a, and is secured to the motor board 17. It is permanently installed. The upper end 27a side of the bearing presser sleeve 27 is housed in the hollow portion 23a so as to be concentric with the supply reel pawl 23.

Further, at the upper end of the through hole 26 of the bearing retainer tube 27, a bearing 2 made of a cylindrical oil-impregnated copper-based sintered alloy is provided.
8 is press-fitted and fixed, and a cylindrical ball bearing 29 is press-fitted and fixed at the lower end to form a bearing portion.

A coil spring 30 is fitted into the upper end portion 27a of the bearing retainer tube 27, and
Against the elastic force of the coil spring 30, the rotary shaft position adjusting member 31, which becomes a bottomed cylindrical thrust receiver, is screwed from the upper end of the bearing presser sleeve 27 to cover the upper end side of the upper end portion 27a. It is worn. A center hole 32 is formed in the bottom of the rotating shaft position adjustment member 31, and a hole 33 is also formed at the top of the supply reel pawl 23, which is opposed to the center hole 32.

On the other hand, below the bulge 17a of the motor board 17,
A circular rotating ring 34 made of a magnetic material such as BMC (bulk mold compound) is provided.
The outer circumferential portion 34a of this rotating ring 34 has a bulging portion 1
7a, and the center thereof is formed into a flat stepped cylindrical portion 34b that protrudes downward. This stepped cylindrical portion 34b
The lower end 27b of the bearing presser sleeve 27 is fitted into the recess 35 formed on the upper surface. A belt 3 is attached to the lower end of this stepped cylindrical portion 34b.
A motor pulley MP, around which 6 is wound, is integrally formed.

Further, a lower end portion 38a of a rotating shaft 38 extending substantially vertically upward is press-fitted into a hole 37 provided at the center of the rotating ring 34, that is, the center of the stepped cylindrical portion 34b. It is planted in 34. Note that the upper end 38b of the rotating shaft 38
is inserted into the through hole 26 of the bearing holding sleeve 27 into which the bearing 28 and ball bearing 29 are press-fitted, the center hole 32 of the rotary shaft position adjustment member 31, and the hole 33 of the supply reel pawl 23. E-rings E2 and E3 are fitted into the grooves formed on the upper end side of the rotating shaft 38, respectively. And the lower E
The ring E2 is in contact with the upper end surface 31a of the rotation bearing adjustment member 31, and the ring E2 is in contact with the upper end surface 31a of the rotation bearing adjustment member 31.
The rotary shaft 38 is moved up and down based on the up and down movement due to the screw engagement of the rotary shaft 38. Further, the upper E-ring E3 is intended to prevent the supply reel claw 23, that is, the supply reel stand 22, from coming off.

The supply reel pawl 23, that is, the supply reel stand 22 is connected to the rotating shaft 38 in the hole 33 of the supply reel pawl 23, and also to the lower end 23c of the supply reel pawl 23.
It is rotatably supported by being guided by the bearing retainer tube 27 at the bottom.

On the lower surface of the outer periphery 34a of the rotary ring 34, a ring-shaped permanent magnet 41 is concentrically adhered to the rotary ring 34 and is magnetized alternately with NS poles in the circumferential direction.

The armature coil assembly 42, which is annular and flat, is placed opposite the lower surface of the rotating ring 34, that is, the lower surface of the permanent magnet 41, and the stepped cylindrical portion 34b is loosely fitted into the hollow portion 42a of the armature coil assembly 42. The motor board 17 is fixed to the motor board 17 with screws or the like.

This armature coil assembly 42 consists of six sets of coil bodies 43a to 43a, each consisting of a pair of single coils.
43f and these six sets of coil bodies 43a to 43f.
It is comprised of a ring-shaped lead attachment portion 44a of a printed circuit board 44 to which each lead terminal is attached. Note that the printed circuit board 44 has a drive circuit section 44b connected to the lead attachment section 44a.
is formed.

This armature coil assembly 42 is manufactured as follows.

A pair of single coils constituting a set are attached to the ring-shaped lead attachment portion 44a.
six sets of coil bodies 43a to 43 are disposed facing each other so as to be sandwiched in a sandwich-like manner;
f is arranged in an annular shape along the ring-shaped lead attachment portion 44a. After the predetermined lead terminals are attached, the lead attaching portion 44a and the six sets of coils 43a to 43f are integrated by sandwiching them in a sandwich-like manner using synthetic resin.

As a result, as shown in FIG. 4, a hexagonal armature coil assembly 42 having a hollow portion 42a is formed.

A circular hysteresis plate 45 is provided on the lower surface of the coil assembly 42 so as to face each other.
This hysteresis plate 45 is centered by fitting its central hole 46 into the stepped cylindrical portion 34b, and is also attracted upward by the magnetic force generated by the magnetic circuit shown in FIG. . It is attached by being supported by the stepped portion 34c of the stepped cylindrical portion 34b.

The rotating ring 34, the permanent magnet 41, and the hysteresis plate 45 constitute a rotor, and the armature coil assembly 42 and the like constitute a stator, forming the main body of the motor M.
The rotor then rotates concentrically with the supply reel stand 22.

As described above, by providing the bearing portion composed of the bearing 28 and the ball bearing 29 concentrically within the hollow portion 23a inside the supply reel pawl 23, the third
As shown in the figure, a sufficient bearing length l can be obtained, and even if the motor M is a flat brushless motor, current consumption and deterioration of wow and flutter can be prevented.

In addition, this motor M is placed on the side of the supply reel stand 22 which does not have a slip mechanism consisting of the rotating wheel body 12 and the friction plate 13, and the rotor is placed on the side of the supply reel stand 22 that does not have a slip mechanism.
By arranging the motor M so as to rotate concentrically with the motor M, the thickness in the direction of the rotational axis of the motor M, that is, in the direction of the axis of the rotational shaft 38 is further reduced, making it possible to make the motor M more compact.

Next, the drive transmission system will be explained with reference to FIG.

Motor pulley of capstan drive motor M
A belt 36 is wound around MP and a capstan flywheel 3F that also serves as a pulley of the capstan 3, and the belt 36 is run in the direction of arrow A by a motor M. And belt 36
The loose side of is crimped to an idler pulley 47P of an idler 47 that swings between the take-up reel stand 10, the rotating wheel body 12, and the supply reel stand 22. Thereby, the motor M is configured to rotate the capstan 3 and the idler 47 in the direction of the arrow.

In addition, the idler 47 has an idler pulley 47P.
In addition, on the upper side of the idler pulley 47P, there is an upper gear 47A which has a small diameter but meshes with the external gear 12A of the rotary wheel body 12 during PLAY, and a first gear 47A which has a large diameter and which will be described later during fast forward FF. The lower gear 21B of the intermediate rotating body 21 is rewinded again.
A lower gear 47 that selectively meshes with a lower gear 48B of a second intermediate rotating body 48, which will also be described later, during REW.
B is provided integrally.

Then, the idler 47 below the take-up reel stand 10
Nearby, the first intermediate rotating body 21 is fixed to the motor board 17 via a support shaft. This first
The intermediate rotating body 21 integrally has large and small gears of different diameters at both upper and lower ends, and the upper gear 21A is always in mesh with the reel stand gear 10A, which is the internal tooth of the take-up reel stand 10, and the lower gear 21B is fast forward FF
At the same time, it meshes with the lower gear 47B of the idler 47.

Also, an idler 47 is installed on the side of the supply reel stand 22.
Nearby, the second intermediate rotating body 48 is fixed to the motor board 17 (not shown) via a support shaft. Similarly, this second intermediate rotating body 48 has gears of different sizes integrally at both upper and lower ends, and the upper gear 48
A is the reel stand gear 22A of the constant supply reel stand 22
The lower gear 48B meshes with the lower gear 47B of the idler 47 during rewinding and REW.

Then play PLAY, fast forward FF and rewind
Regarding the operation during REW, Figure 6 A, B and 6
This will be explained with reference to Figure C.

During play (FIG. 6A) When the PLAY button (not shown) is pressed, the idler 47 swings in the direction of _the arrow mesh with. As a result, the rotary wheel body 12 rotates counterclockwise, and the take-up reel stand 10 is rotated through the friction plate 13.
rotates counterclockwise.

During fast forward (FF) (Fig. 6B) By pressing the fast forward FF button (not shown),
The idler 47 swings in the direction of arrow _XF , and the lower gear 47B is connected to the lower gear 21B of the first intermediate rotating body 21.
fit together. As a result, the first intermediate rotating body 21
rotates counterclockwise, and the take-up reel stand 10 rotates counterclockwise.

During rewinding (REW) (Fig. 6C) When the rewinding REW button (not shown) is pressed, the idler 47 swings in the direction of _arrow 48 lower gear 4
It meshes with 8B. As a result, the second intermediate rotating body 4
8 rotates counterclockwise, and the supply reel stand 22 rotates clockwise.

Next, a modification will be explained with reference to FIG.

This modification example includes a thrust adjustment member 31, a coil spring 30, and an E-ring from the embodiment shown in FIG.
If E ₂ is removed, the structure becomes almost the same as this embodiment, but in this example, the motor board 1
7' is made of magnetic material.

Therefore, the rotor yoke 34 and the rotating shaft 38 are pulled upward in FIG. It starts to give preload.

That is, the ball bearing 29 has its outer ring portion 29a press-fitted into the inner peripheral surface of the lower end portion 27b of the bearing sleeve 27', and its inner ring portion 29b is loosely fitted to the rotating shaft 38, so that it is not affected by magnetic attraction force. Therefore, when the rotating shaft 38 and the like are pulled up as described above, the annular rib 34d of the rotor yoke 34 is pulled up by the inner ring portion 29b.
along the rotating shaft 38 upward in the figure.

However, since the movement of the inner ring part 29b in the axial direction is restricted by the balls interposed between the inner ring part 29b and the outer ring part 29a, the bearing sleeve 27' and the rotating shaft 3
The relative position between the ball bearings 8 and 8 is regulated with a preload applied to the ball bearing 29.

The rotating shaft 38 is fitted with an E-ring E' ₃ for preventing the reel shaft pawl 23 and the reel 22 from coming off, so even if an impactful load is applied to the rotating shaft 38, the rotating shaft 38 There is no risk of it escaping downward in Figure 7.

Thus, in this modification, unlike the embodiment shown in FIG. 3, the thrust adjustment member 3 is not required, so the thickness of the rotating shaft 38 in the axial direction can be reduced accordingly.

Effects of the Invention The present invention has the following advantages.

A flat type motor is used as the motor that rotates the capstan, and the supply reel side does not have a slip mechanism on the upper or lower side of the motor to wind the tape from start to finish with an appropriate tension without slack during play. In addition, by arranging the motor rotor and the reel stand so that they rotate concentrically, it is possible to make the device thinner, and the device can be made even more compact.

[Brief explanation of the drawing]

1 to 7 are drawings for explaining one embodiment of the tape recorder device according to the present invention, in which FIG. 1 is a plan view, FIG. 2 is a sectional view of the take-up reel claw side, Figures 3 and 4 are a sectional view and an exploded perspective view of the supply reel claw side, Figure 5 is a perspective view of the drive transmission system, and Figures 6A, B, and 6C explain the operation of the drive transmission system. FIG. 7 is a sectional view of a modification of the supply reel claw side. In addition, in the symbols used in the drawings, 3
... Capstan, 22 ... Supply reel stand, M...
...It's a motor.

Claims (1)

[Claims] 1. A tape recorder device characterized in that a motor for rotationally driving a capstan is constituted by a flat type motor, and a rotor of the flat type motor is arranged so as to rotate concentrically with a supply reel stand.