JPS58148650A - Driving device for tape - Google Patents

Abstract

PURPOSE:To reduce the planar area to the minimum and to reduce the thickness of a drive device for a tape by providing the bearing of the tape at a retainer which specifies the axial movement of a rotor which drives the tape and forming the retainer integral with a motor. CONSTITUTION:A holder 33 is provided on a chassis 32 of a tape recorder body corresponding to the prescribed position in the planar region of a cassette 31, and a rotor 37 which is made of a capstan shaft 35 and a flywheel 36 is journaled to the holder 33. A bearing 51 is mounted on a retainer 41 which specifies the axial movement of the rotor 37 by a buffer member 40, and a motor shaft 53, on which the rotor having a magnet 57 which is magnetized in multiple poles and a back yoke 59 are mounted, is journaled on the bearing 51, a substrate 60, on which a coil 61 is fixed through a spacer 43 to the retainer 41 is mounted, and interposed between the rotor and the yoke 59. Accordingly, the motor is integrated with the retainer 41, thereby reducing the thickness of the entirety.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape drive device, and more particularly to an improvement in a motor mounting structure in a tape drive device for a small cassette tape recorder.

Conventionally, the mounting structure of the motor of the tape drive device in a small cassette tape recorder was as shown in Fig. 1 or 2. It is equipped with a tape drive.

In Fig. 1, the cassette (2) of the main body of the tape recorder is located below the cassette (11), and the flywheel (4) is press-fitted into the lower end by the bearing (5) provided on the cassette (2). A capstan shaft (31) is rotatably supported.(6) is fixed by sandwiching a tape (7) built in the cassette (1) between it and the capstan shaft (3). The running pinch roller (8) is a thrust receiving plate mounted parallel to the jacket (2) at a constant interval by a support OQ, and the lower end of the capstan shaft (3) is elastically The flywheel (
4) restricts the movement in the axial direction. (7) is a motor body that is attached closely to the thrust receiving plate (8), and the screw (2) passing through the hole (B) provided in the thrust receiving plate (8) is inserted into the motor body (the main body). ) is attached by tightening it to the threaded part provided on the cover. (2) is a cover &
1) is a motor pulley fixed to a rotor shaft which is rotatably supported by a bearing fixed to the rotor shaft.

Rotation is transmitted from this motor pulley (support) to the flywheel (4) via a belt (E). A rotor plate (E) to which a driving magnet 4 is fixed is integrally attached to the rotor shaft (E) via a bracket (E).

The one shown in FIG.
In the figure, a cassette (1), a jacket (2), a capstan shaft C3), a flywheel (4), a bearing (5),
Pinch roller (6), tape (7), thrust receiving plate (8)
), the buffer member (9), and the strut αG are the same as in FIG. The motor body (E) is attached to the jacket (2) in close contact with the same side as the cassette (1). This close mounting is achieved by tightening the screw (b) that passes through the jacket (2) into the threaded part of the mounting plate (to), which is provided in an L-shape on the outer peripheral wall of the cover (c) of the motor body (e). It is carried out in Also, the motor pulley (support), bearing ■, rotor shaft (c), etc. are also the 1st v! Same as J.

In this way, in the conventional tape recorder motor mounting structure, all the main components are covered by a cover (C) so that the motor can function as a standalone motor, and the motor is mounted through this cover (C). Therefore, when tightening the screw (2) into the threaded part of the cover 36 as shown in Figure 181,
Foreign matter such as chips from screwing gets into the cover (c) and adheres to the drive magnet (to), which not only interferes with the rotation of the rotor, but also prevents the motor from becoming large due to the cover. There was a problem in that the thickness of the recorder could not be made smaller.

On the other hand, if the motor is arranged as shown in FIG. 2, the thickness can be reduced. However, there was a problem in that the fair area became large, making it impossible to respond to miniaturization. As described above, there are currently major obstacles to realizing a compact cassette tape recorder.

SUMMARY OF THE INVENTION In view of these conventional drawbacks, it is an object of the present invention to provide a tape drive device whose planar area can be made as small as possible and whose thickness can be made thinner.

In order to achieve this object, the present invention disposes the cassette on a receiving plate that controls the axial movement of a rotating body driven by the motor and whose rotation causes the tape built in the cassette to run. The rotor shaft is provided in a plane area and near the rotating body, and one end of the rotor shaft protruding toward the rotating body and rotatably supported by the bearing is interlocked and connected to the rotating body, and the rotor shaft is connected to the rotating body side. The present invention provides a tape drive device in which the motor is integrated with the receiving plate and the thickness is reduced by arranging the drive portion of the motor at the other end protruding to the opposite side.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 8. In Fig. 3, a cylindrical holder is fixed on the jacket of the tape recorder main body in correspondence with a predetermined position within the plane area where the cassette g1υ is arranged, and an oil-less metal ■ is pushed into this holder. bearings are configured. The rotating body (2) is rotated by the capstan shaft ■ which is rotatably held by this oil-less metal (foundation) and the flywheel ■ which is fixed to the lower end of this capstan shaft by means such as caulking press-fitting. It is configured. (To) is connected between the capstan shaft (To) and the cassette (To).
Insert the built-in tape (to) in (b) and press it together,
This is a pinch roller that allows constant running.

A V-shaped belt groove is formed in the flywheel. The lower end of the capstan shaft (end) slightly protrudes below the flywheel (end), has a hemispherical shape, and abuts against the buffer member. This buffer member elastically supports the hemispherical surface of the lower end of the capstan shaft μs so as to allow minute movements in the axial direction of the rotating body (to), and when the rotating body (to) rotates. It reduces frictional resistance and smoothes rotation;
It is held on the east side of the thrust receiving plate, which is arranged parallel to the flywheel and with the flywheel in between. - is the support that attaches the thrust receiving plate to the base. A motor is disposed in the thrust receiving plate curved in the vicinity of the rotating body and within the pupil plane area of the cassette 6p. The bearing of this motor is attached to the thrust receiving plate -υ, and an oil-less metal plate is inserted into this bearing l1l). This oil-less metal
A rotor shaft is fitted into and rotatably supported. - is the flywheel (to) of the rotor shaft -
It is a motor pulley fixed to one end that protrudes to the side.
A belt is wound between this motor pulley and the V-groove of the flywheel (to), and the two are connected to each other so that rotation is transmitted through this belt. A driving portion of a motor is disposed at the other end of the rotor shaft wheel on the opposite side from the flywheel, that is, at the end below the thrust receiving plate of the rotor shaft. That is,
A rotor bushing is press-fitted into the other end of the rotor shaft, and a recess provided in the rotor bushing surrounds the bearing ←υ with a gap therebetween. This rotor bushing has a rotor made of a thin plate of magnetic material that is shaped so as to wrap around the outer periphery and the other surface of a magnet, which has a surface with six poles magnetized alternately with S and N poles. The plate branch is fixed. The fixed position of this rotor plate member is located above the position where the rotor bush ring is caulked and press-fitted into the rotor shaft ring. These rotor shaft 63.0-turbine bushing (2), rotor plate member, and magnet 6'' constitute one rotor member.

the magnet 6 at the lower end of the rotor bushing)
The back yoke of the disk-shaped magnetic yoke is loosely fitted with a small space left between η and η. - is a film-like thin substrate, and this substrate (3) is attached to the thrust receiving plate (roller) K by means of a spacer. This board-
is located in the space between the magnet side of the rotor bush and the back yoke ring, and is located so that it has a small gap with the surface of the magnet r and does not come into contact with it due to vibration even if the magnet r rotates. are doing. Furthermore, a coil retainer wound with six windings #c is fixed to the lower surface of the back yoke side of this board at a position corresponding to the magnetic field on the magnet side, and its wiring is printed on the board This is done by wiring. A minimum space is provided between the lower surfaces of these six coils (1) and the facing surface of the back seeker so that they do not come into contact with each other due to vibration even if the back yoke rotates, and the back seeker is connected to the magnet (2). It is attracted by the magnetic force of the rotor tab and fixed to the rotor bushing. A stator member is composed of these coils (1) and the board.

Fig. 4 shows a plane view of the magnet provided on the rotor plate of the motor, Fig. 5 shows a longitudinal section of the motor, and Fig. 6 shows the coil provided on the motor control board. It shows the arrangement of.

FIG. 7 shows the drive circuit of the motor 4, and shows three Lm% corresponding to the three N poles detected by the magnet I″h.
Coil rows in which the tg and t's coils and the three La, La, and Ls coils corresponding to the three Si are connected in series are arranged in parallel and driven by a servo circuit. . This servo circuit g (l) receives a signal from a position detection circuit (c) that detects the rotational position of the rotor plate (iii) using a photosensor, magnetic sensor, etc., and current is passed through which of the two coil arrays. In addition, the speed setting circuit (to) that sets the rotational speed of the motor controls the servo circuit to maintain a constant speed, and as a result of the above, the brushless type It is configured.

In a motor configured in this way, the lines of magnetic force of the magnet block cross the coil 11) and reach the back yoke, so when a current is passed through the coil 11 from the servo circuit, the direction of the current and the direction of the lines of magnetic force are Due to Fleming's left-hand rule, a force is generated on the coil, and since this coil lever is fixed to the board, the reaction force causes the rotor plate, to which 7 gnets) 17) are fixed, to rotate, and this rotor The rotor shaft ring and its pulley, which are integrated with the plate branch, rotate.

As the motor pulley rotates, the rotating body (■) rotates via the bell (M), and the tape (■) built in the cassette eυ is rotated.
runs at a constant rate.

Fig. 8 shows a small cassette tape recorder in relation to a tape drive device, in which a cassette (b) is provided with a jacket (2) slightly larger than the cassette 0η at the bottom of the cassette (b). RAD to record and playback on the top of ■
and an erasing head @p are placed in a state where they can come into contact with the tape 4. Further, a pinch roller is also provided on the capstan shaft for sandwiching and pressing the tape between the tape and the capstan shaft wheel to cause the tape to travel.

A flywheel into which the capstan shaft is press-fitted and a motor pulley are located below this shaft, and rotation is transmitted through the belt. The motor bearing (1), which restricts the axial movement of the flywheel (2), is provided parallel to the bottom of the chassis (2) by means of an integrally provided thrust receiving plate or four struts. In this way, the rotating body (goods) including the motor and the flywheel are assembled in the thickness direction at 1111, which fits within the external dimensions of the cassette set 0υ. In this way, by integrating the motor ■ into the thrust receiving plate L4 sword, it is possible to maximize the thickness of the tape drive device housed in the size of the beam cassette 6υ, and furthermore, with the simplification of the installation work, Troubles during motor installation are eliminated, the life of the motor becomes semi-permanent, and as materials are integrated, fewer materials are required, leading to cost reductions. By using a brushless motor as the main motor and incorporating it into the tape recorder as a mechanical component, ease of assembly is improved.
The configuration is simplified.

According to the tape drive device of the present invention, as is clear from the above description, the bearing of the motor is provided on the receiving plate that regulates the axial movement of the rotating body, and the receiving plate and the motor are integrally configured. Therefore, the thickness can be reduced while maintaining a limited size, there is no trouble when installing the motor, and less materials are required, which results in great effects such as cost reduction.

[Brief explanation of the drawing]

1 and 2 are partially sectional side views of a conventional tape drive device, FIGS. 3 to 8 show an embodiment of the present invention, FIG. 3 is a partially sectional side view, and FIG. 4 is a partially sectional side view of a conventional tape drive device. FIG. 5 is a plan view of the magnet, FIG. 5 is a longitudinal sectional view of the motor, FIG. 6 is a plan view showing the arrangement of coils, FIG. 7 is a motor drive circuit diagram, and FIG.
The figure is a schematic plan view showing the arrangement of a tape drive device of a small cassette tape recorder. 6 is the cassette, (2) is the jacket, (to) is the capstan shaft, (7) is the flywheel, (b) is the rotating body, (
(to) is the tape, the ring is the buffer member, and (2) is the thrust receiving plate (
The phrase is the motor, the ring is the bearing, the ring is the rotor shaft, - is the motor pulley, the ring is the belt, the rotor bush is the rotor bushing, the position is the magnet, the ring is the rotor plate, - is the back yoke, ■ is the board, and the date is is a coil.

Claims (1)

[Scope of Claims] (11) The cassette is located near a rotating body that is driven by a motor and whose rotation causes the tape contained in the cassette to travel, and within a plane area in which the cassette is arranged, so as to control the axial movement of the rotating body. A bearing of the motor is provided on the regulating support plate, and one end of the rotor shaft rotatably supported by the bearing, which protrudes toward the rotating body, is movably connected to the rotating body, and the rotor shaft is connected to the rotating body on the opposite side of the rotating body. A tape drive device in which a motor drive section is disposed at the other end of the motor. a stator member including a substrate on which coils arranged corresponding to the number of magnetic poles are disposed; a back yoke attached to the rotor member so as to sandwich the stator member therebetween; A motor drive circuit comprising a servo circuit for controlling the distribution of current, a position detection circuit for detecting the rotational position of the rotor member, and a speed setting circuit for setting the rotational speed of the rotor member. A tape drive according to scope 1.