JPH10222895A - Rotor for capstan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rotor for the capstan motor, equipped with a pulley part and a flange part and capable of reducing cost and also preventing a flange part from falling off by simple constitution. SOLUTION: In this rotor 10 including a rotary shaft 11, a rotor case 13 fixedly held by the rotary shaft 11, a rotor magnet provided on the rotor case 13, the pulley part 12 fitted to the rotary shaft 11 and the flange part 15 provided on the side of the pulley part 12 and also formed with a larger diameter than the pulley part 12, the pulley part 12 and the flange part 15 having the larger diameter than this pulley part 12 are alternately formed at intervals of 60 degrees around the rotary shaft 11, so that the rotor 10 for the capstan motor is constituted to be substantially one member by integrally forming the pulley part 12 and the flange part 15 with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a capstan motor used in a video tape recorder (VTR) or the like, and more particularly, to a pulley unit for transmitting a rotating torque of the rotor to another mechanism by a synchro belt or the like. The present invention relates to a structure of a rotor having a flange portion.

[0002]

2. Description of the Related Art Conventionally, a rotor of such a capstan motor is constructed as shown in FIGS. 6 and 7, for example. 6 and 7, a rotor 1 is provided on a pulley 3 attached around a rotation shaft 2, a rotor case 4 fixedly held to the pulley 3, and an outer surface of the rotor case 4. FG magnet 5 for rotation detection and a flange 6 provided on the upper edge of the pulley 3.

The pulley portion 3 is fixed to the rotating shaft 2 via a mounting member 3a as shown in FIG. 8, and has an outer peripheral surface on the entire circumference as shown in FIG. A gear portion with which a synchro belt or the like abuts is provided.

The rotor case 4 is formed integrally with the pulley portion 3 by outsert molding or the like. The rotor case 4 spreads in a disk shape, and its outer peripheral edge extends downward in the drawing, so that the rotor case 4 is flat. The FG magnet 5 is attached to the outer peripheral surface of the FG magnet 5. The rotor case 4 has a rotor magnet 4a (see FIG. 8) on its lower surface.
This rotor magnet 4a interacts with a driving coil fixedly arranged on the stator side, so that the rotor 1 can be driven to rotate around the rotation shaft 2.

The flange 6 is formed at the upper end side of the pulley 3 to have a larger diameter than the pulley 3 so that the synchro belt wound around the pulley 3 does not come off. , Or to the rotating shaft 2 by light press-fitting,
It is fixed (see FIG. 8).

According to the rotor 1 configured as described above,
The rotor 1 is driven to rotate around the rotating shaft 2 by a rotor magnet 4 a attached to the lower surface of the rotor case 4 interacting with a driving coil fixedly arranged on the stator side. The rotation of the rotor 1 is monitored by detecting the rotation of the FG magnet 5 by detecting a current generated in a rotation detection coil provided on the stator side. For example, the drive current flowing through the drive coil is appropriately adjusted. By performing the control, the rotational drive of the rotor 1 can be servo-controlled.

Here, with respect to the pulley portion 3 of the rotor 1,
As shown in FIG. 10, when the synchro belt 7 is wound, the pulley 3 rotates around the rotation shaft 2 with the rotation of the rotor 1, so that the pulley 3 is not shown via the synchro belt 7. The rotation torque can be transmitted to other mechanisms.

[0008]

However, in the rotor 1 having such a configuration, as described above, the flange 6 is formed separately from the pulley 3 and then the pulley 3 or the rotating shaft 2 is formed. Is mounted by light press-fitting. Accordingly, the number of components increases, and a light press-fitting operation of the flange portion 6 is required at the time of assembling the rotor 1. Therefore, there is a problem that component costs and assembly costs increase.

Further, since the flange portion 6 is attached to the pulley portion 3 or the rotary shaft 2 by light press-fitting, when a force is applied to the flange portion 6 carelessly, the flange portion 6 is attached. There is a problem that the sync belt 7 may come off from the pulley 3 or the rotary shaft 2, thereby causing the synchro belt 7 to drop off from the pulley 3.

On the other hand, if the flange portion 6 is forcibly formed integrally with the pulley portion 3, a parting line of a molding die will be formed on the surface of the pulley portion. There was a problem that the synchronous belt could not be smoothly driven, and the transmission of the rotational torque could not be performed accurately.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a capstan motor rotor having a pulley portion and a flange portion, which has a simple structure, can reduce the cost, and prevents the flange portion from falling off. It is intended to provide.

[0012]

According to the present invention, there is provided a rotating shaft, a rotor case fixedly held on the rotating shaft, a rotor magnet provided on the rotor case, and a rotating shaft mounted on the rotating shaft. A capstan motor rotor including a pulley portion and a flange portion provided on one side of the pulley portion and having a larger diameter than the pulley portion. , Pulley part,
This is achieved by the capstan motor rotor, wherein the pulley portion and the flange portion are substantially integrally formed by alternately forming flange portions having a larger diameter than the pulley portion. Is done.

[0013] In the rotor of the capstan motor according to the present invention, preferably, the flange portion is formed by a mold having a die-cutting direction perpendicular to the rotation axis, and the pulley portion is formed in a mold parallel to the rotation axis. It is designed to be molded by a mold having a drawing direction.

According to the above configuration, since the pulley portion and the flange portion are formed substantially integrally, the number of parts can be reduced, and the cost of parts and assembly can be reduced.

Further, the synchro belt or the like wound around the pulley portion always comes into contact with the outer peripheral surface of one of the pulley portions against the outer peripheral surface of the pulley portion located at an interval of 60 degrees. Can be smoothly transmitted from the pulley portion to other mechanisms via a synchro belt or the like, and is regulated in the rotational axis direction by the flange portions located at intervals of 60 degrees. The belt and the like do not come off the pulley portion.

Further, since the flange portion is formed integrally with the pulley portion, even if force is applied carelessly to the flange portion, the flange portion does not come off from the pulley portion, and the synchro is performed. The belt or the like can be prevented from falling off.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. 1 to 5 show one embodiment of a rotor of a capstan motor according to the present invention. 1 and 2, the rotor 10 is
A pulley portion 12 attached around a rotating shaft 11 and a rotor case 1 fixedly held to the pulley portion 12
3, an FG magnet 14 for rotation detection provided on the outer surface of the rotor case 13, and a flange 15 provided on the upper edge of the pulley 12.

As shown in FIG. 3, the pulley portion 12
It is fixed to the rotating shaft 11 via a mounting member 12a, and has a gear portion on its outer peripheral surface with which a synchro belt or the like abuts.

As shown in FIG. 3, the rotor case 13 is formed integrally with the pulley portion 12 by outsert molding or the like. By extending downward, it has a flat cylindrical shape, on its outer peripheral surface,
The FG magnet 14 is attached. A rotor magnet 13a (see FIG. 3) is attached to a lower surface of the rotor case 13, and the rotor magnet 13a interacts with a driving coil (not shown) fixedly arranged on the stator side. Accordingly, the rotor 10 can be driven to rotate around the rotation shaft 11.

The flange portion 15 is provided on the pulley portion 12 so that the synchro belt wound around the pulley portion 12 does not come off.
Is formed to have a diameter larger than that of the pulley portion 12 at the upper end side. In the case shown in the figure, the flange 15 is connected to the pulley 12
Is formed so as to have a slightly smaller diameter than the gear on the outer peripheral surface of the pulley portion 12.

The above construction is the same as that of the conventional capstan motor rotor 1 shown in FIGS. 6 to 10, but in the capstan motor rotor 10 according to the present invention, the pulley section 12 and the flange The part 15 is formed of one member 16 integrally formed with each other as shown below.
Is configured as That is, as shown in FIG. 4, the member 16 includes the pulley portion 12 and the flange portion 1 having a diameter larger than
5 are formed so as to be alternately arranged, whereby the pulley portion 12 and the flange portion 15 are substantially integrally formed.

When the member 16 is formed, the pulley portion 12 is formed by a die which is cut out in parallel with the rotating shaft 11 in FIG. 15 is formed by a die that is die-cut outward in the radial direction perpendicular to the rotation shaft 11 in FIG. By using such a molding die, the flange portion 15 is die-cut in the radial direction, and the pulley portion 12 is die-cut in the axial direction.
The outer peripheral surface of the pulley portion 12 with which the roller abuts can be formed with high precision, and a parting line of a molding die does not occur on the outer peripheral surface of the pulley portion 12.

The molding of the member 16 is performed by the rotor case 1.
By providing a hole 13b through which a part of the lower mold passes through at the portion where the flange 15 of the flat part 3 is formed, the flange 15 can be formed with a part of the lower mold. Both the flange 12 and the flange 15 can be formed only by the upper and lower dies which are die-cut in parallel to the axial direction of the rotary shaft 11.
This eliminates the need for a die that is die-cut outward in the radial direction perpendicular to the mold.

The rotor 10 according to the embodiment of the present invention is configured as described above. The rotor 10 has a rotor magnet 13 attached to the lower surface of the rotor case 13.
a interacts with a driving coil (not shown) fixedly arranged on the stator side, and thereby is rotationally driven around the rotating shaft 11. The rotation of the rotor 10 is monitored by detecting the rotation of the FG magnet 14 by detecting a current generated in a rotation detection coil (not shown) provided on the stator side, and flows to, for example, the drive coil. By appropriately controlling the drive current, the rotational drive of the rotor 10 can be servo-controlled.

In this case, when the synchro belt 17 is wound around the pulley portion 12 of the rotor 10 as shown in FIG. , The rotational torque can be transmitted to another mechanism (not shown) via the synchro belt 17. At this time, the synchro belt 17
Is always in contact with the outer peripheral surface of one of the pulley portions 12, so that the rotation torque can be transmitted reliably and smoothly. At this time, the synchro belt 17 abutting on the outer peripheral surface of the pulley portion 12 is regulated by the flange portion 15 before and after the pulley portion 12, so that it can be prevented from falling off from the pulley portion 12. I have.

Further, in the rotor 10, since the flange portion 15 is formed substantially integrally with the pulley portion 12, the number of parts and the cost of parts are reduced. Therefore, unlike the conventional rotor 1 shown in FIGS. 5 to 10, it is not necessary to press-fit the flange portion 15 into the pulley portion 12 lightly, so that assembling is facilitated and assembly cost is reduced. You will get.

In the above embodiment, the member 16
The pulley portion 12 has a gear portion on its outer peripheral surface,
Although the flange portion 15 does not have a gear portion on the outer peripheral surface, it is apparent that the member 16 may have a gear portion that is continuous with the gear portion of the pulley portion 12 over the entire circumference. . On the other hand, the member 16 may be formed so that the outer peripheral surface of the pulley portion 12 and the outer peripheral surface of the corresponding flange portion 15 do not include the gear portion, and have a continuous cylindrical surface. . In this case, the member 16 has a shape corresponding to a square belt or a round belt.

[0028]

As described above, according to the present invention, since the pulley portion and the flange portion are formed substantially integrally, the number of parts can be reduced, and the cost of parts and assembly can be reduced. You will get. Further, since the synchro belt or the like wound around the pulley portion always comes into contact with the outer peripheral surface of one of the pulley portions located at an interval of 60 degrees, the rotational torque of the rotor is reduced. But,
The transmission can be smoothly transmitted from the pulley portion to other mechanisms via the synchro belt or the like, and the synchro belt or the like is controlled by the flange portion located at an interval of 60 degrees in the rotation axis direction. There is no such thing as getting out of the department. Further, since the flange portion is formed integrally with the pulley portion, even if a force is applied carelessly to the flange portion, the flange portion does not come off from the pulley portion, and the synchro belt or the like can be used. Falling out can be prevented.

Thus, according to the present invention, a capstan motor having an extremely excellent capstan motor having a pulley portion and a flange portion can be reduced in cost by a simple structure and can prevent the flange portion from falling off. A rotor could be provided.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of a rotor of a capstan motor according to the present invention.

FIG. 2 is a plan view of the rotor of FIG. 1;

FIG. 3 is a longitudinal sectional view of the rotor of FIG. 1;

FIG. 4 is a sectional view taken along line AA of the rotor of FIG. 3;

FIG. 5 is a schematic diagram showing a relationship between a pulley portion and a flange portion and a synchro belt in the rotor of FIG. 1;

FIG. 6 is a schematic perspective view showing one embodiment of a rotor of a conventional capstan motor.

FIG. 7 is a plan view of the rotor of FIG. 6;

FIG. 8 is a longitudinal sectional view of the rotor of FIG. 6;

FIG. 9 is a sectional view taken along line BB of the rotor of FIG. 8;

FIG. 10 is a schematic diagram showing a relationship between a pulley portion and a flange portion and a synchro belt in the rotor of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rotor of capstan motor 11 Rotating shaft 12 Pulley part 13 Rotor case 13a Rotor magnet 13b hole 14 FG magnet 15 Flange part 16 Member composed of pulley part and flange part 17 Synchro belt

Claims (3)

[Claims] 1. A rotating shaft, a rotor case fixed and held on the rotating shaft, a rotor magnet provided on the rotor case, a pulley mounted on the rotating shaft, and a pulley provided on one side of the pulley. A capstan motor rotor including a flange portion having a larger diameter than the portion, wherein the pulley portion and the flange portion having a diameter larger than the pulley portion are provided at intervals of 60 degrees with respect to the rotation axis. Are alternately formed so that the pulley portion and the flange portion are substantially integrally formed. 2. The method according to claim 1, wherein the flange portion is formed by a mold having a die-cutting direction perpendicular to the rotation axis, and the pulley portion is formed by a die having a die-cutting direction parallel to the rotation axis. The rotor of the capstan motor according to claim 1, wherein: 3. The capstan motor rotor according to claim 1, wherein both the flange portion and the pulley portion are formed by a mold having a die cutting direction parallel to a rotation axis.