KR100202016B1 - Reel driving device of tape recorder - Google Patents

Abstract

The present invention discloses a reel driving apparatus of a tape recorder.

The present invention provides a bracket comprising: a bracket provided with a support boss; A support shaft fixedly mounted on the support boss; A reel pulley having a belt groove formed at its center and having first and second guide bosses extending in a diameter direction; A damper gear inserted into the second guide boss so as to hold a predetermined gap therebetween; A clutch wheel which is rotated together with the damper gear while being inserted into the first guide boss of the reel pulley so as to be movable up and down; An oil introduced into the gap between the damper gear and the second guide boss to generate a frictional force between the damper gear and the second guide boss; A spring interposed between the clutch wheel and the upper surface of the reel pulley to elastically support the clutch wheel upward; It is possible to reduce the cost due to the reduction in the number of parts, and in particular, since the abrasion due to the friction does not occur between the damper gear and the reel pulleys, It is possible to obtain a stable torque force at all times. Therefore, it is possible to improve the reliability of the tape recorder employing it.

Description

Reel drive unit of tape recorder

1 is a plan view conceptually showing a traveling system of a general tape recorder;

Figure 2 is a cross-sectional view of a typical reel drive.

3 is a sectional view of the reel driving device according to the present invention;

FIG. 4 is a perspective view illustrating the damper gear and the clutch wheel. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: Main Chassis 20: Bracket

30: support boss 40: support shaft

50: Reel pulley 52,53: First and second guide bosses

60: damper gear 61: guide groove

70: clutch wheel 71: guide projection

80: Oil

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder, and more particularly, to a reel driving apparatus capable of driving a reel table with an appropriate rotation torque in accordance with a drive mode.

FIG. 1 conceptually shows a typical tape recorder.

The tape T is fed forward or backward by the supply reel SR and the reel TR and at the same time is constantly transported by the capstan shaft CS and the pinch roller PR.

A supply reel SR and a reel TR such as this are selectively driven from anadiler ID for transmitting the power of the capstan motor CM for rotating the capstan shaft CS. That is, the winding reel TR that is driven in the forward direction (clockwise direction) is driven to rotate in the same direction, and when the supply reel SR is driven in the reverse direction (counterclockwise, REV MODE) do.

At this time, the winding reel TR is installed close to the capstan motor CM so that a large rotational torque is not required for forward rotation of the tape T. On the other hand, the supply reel SR is located at a relatively long distance A considerable load (load) is required at the time of running the tape T in the reverse direction, so that a heavier rotational torque is required. Further, in the high-speed running mode (REW, FF MODE) in which the tape T is not in the normal running, a larger rotational torque is required.

The reel driving apparatus is capable of varying the rotation torque according to the driving mode and appropriately generating friction and slip according to the driving speed.

2, the conventional reel driving apparatus is provided with a belt groove 1a on the outer peripheral surface thereof so as to receive power from the capstan motor CM through the belt B, And a reel pulley 1 rotatably provided on a support shaft (not shown) fixed to the main chassis 3 and extended therefrom to extend first and second support bosses 1b and 1c.

A reel gear 2 is inserted on the second support boss 1c of the reel pulley 1 so as to be substantially engaged with an idler ID and inserted between the reel gear 2 and the reel pulley 1 The spring holder 3 and the clutch wheel 4 are sequentially positioned.

On the other hand, a unidirectional spring (S) is provided on the first support boss (1b) of the reel pulley (1) for generating a slip torque.

The lower surface of the clutch wheel 4 and the upper surface of the reel pulley 1 are provided with a plurality of engaging projections 11, 41 which are mutually engaged with each other by a direct drive lever (not shown).

In the conventional driving apparatus configured in this manner, during the normal mode (PLAY MODE, REV MODE), the torque force is obtained through the slip force of the one-way spring S interposed on the first support boss 1b, And REW MODE, the torque force is obtained through the engagement action between the clutch wheel 4 and the engagement protrusions 1d and 4a of the reel pulley 1. [

However, in such a conventional reel driving apparatus, since the unidirectional spring S is frictionally slip on the outer circumferential surface of the first supporting boss 1b to obtain a torque force in the high speed mode, Wear is generated between the shafts and the running torque is changed, and it is a serious problem that the whole of the apparatus is defective.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the conventional problems, and it is an object of the present invention to provide a reel driving device of a tape recorder capable of always obtaining a stable torque force, and in particular, preventing a driving torque from changing even when used for a long time. It has its purpose.

In order to accomplish the above object, according to the present invention, there is provided a reel driving apparatus for a tape recorder, comprising: a tape recorder for receiving power from a capstan motor located at one side of a main chassis through a belt and rotationally driving a pair of reel tables; A bracket extending from a lower side of one side of the main chassis and having a support boss protruded upward at one side thereof; A support shaft fixedly mounted on the support boss; A belt groove is formed on an outer circumferential surface of the support shaft so as to receive power from the capstan motor through a belt, and a first and a second guide bosses, each having a diameter, Wow; A damper gear interposed between the second guide boss of the reel pulley so as to hold a predetermined gap therebetween; A clutch wheel that is rotated together with rotation of the damper gear while being inserted into the first guide boss of the reel pulley movably upwardly and downwardly; An oil introduced into the gap between the damper gear and the second guide boss to generate a frictional force between the damper gear and the second guide boss; A spring interposed between the clutch wheel and the upper surface of the reel pulley to elastically support the clutch wheel upward; And the like.

A preferable feature of the present invention is that the support boss provided on the bracket is integrally formed through the outsert.

Another advantageous feature of the present invention is that a plurality of guides are provided along the longitudinal direction between the inner surface of the clutch wheel and the outer surface of the damper gear to guide the clutch wheel to be moved up and down along the first guide boss, Grooves and protrusions are selectively provided.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

FIG. 3 is an assembled cross-sectional view of a reel driving device according to the present invention, and FIG. 4 is an exploded perspective view illustrating a damper gear and a clutch wheel. The present invention will be described with reference to FIG.

As shown, the reel driving device of the tape recorder according to the present invention has a capstan motor CM positioned on one side of the main chassis 10, and a bracket 20 Is extended.

The bracket 20 is provided with a support boss 30 having a through hole 31 through which the support shaft 40 is press-fitted in the longitudinal direction. At this time, it is preferable that the support boss 30 is integrally injection-molded through outsert in terms of cost reduction and work.

On the other hand, a reel pulley 50 is rotatably supported on the support shaft 40, and the power from the above-mentioned capstan motor CM is transmitted to the outer peripheral surface of the lower pulley 50 via the belt A belt groove 51 is provided and first and second support bosses 52 and 53 whose diameters are different from each other are gradually extended gradually toward the upper side.

A damper gear 60 is inserted into the second guide boss 53 of the reel pulley 50. The inner circumferential surface of the damper gear 60 is engaged with a second guide boss 53 Thereby maintaining a gap. That is, more specifically, the gap between the second guide boss 53 and the first guide boss 52 and the predetermined gap is maintained.

A clutch wheel 70 is disposed between the reel pulley 50 and the damper gear 60. The clutch wheel 70 is slidably inserted upward and downward along the first guide boss 52, In particular, the upper outer circumferential surface thereof is inserted so as to be rotated together with the damper gear 60.

In this case, between the inner peripheral surface of the clutch wheel 70 and the outer peripheral surface of the damper gear 60 so that the clutch wheel 70 is slidably moved upward and downward along the first guide boss 52, (61) and guide protrusions (71). In this case, the guide groove 61 is provided on the damper gear 60, and the guide protrusion 71 is provided on the clutch wheel 70. However, It may be possible to provide a projection.

The oil 80 having a predetermined viscosity is introduced between the gap between the damper gear 60 and the second guide boss 53. The oil 80 flows into the gap between the inner surface of the damper gear 60 and the inner surface of the damper gear 60, 2 guide bosses 53. The guide bosses 53,

A spring (90) is interposed between the clutch wheel (70) and the upper surface of the reel pulley (50) to elastically support the clutch wheel (70) upward.

(54) and (72) indicate that the clutch wheel 70 is moved downward by the direct drive lever in the high-speed mode, A plurality of locking protrusions which are engaged with each other by sliding movement.

Hereinafter, an operation example of a reel driving device of a tape recorder according to the present invention will be described.

When the reel pulley 50 is rotated around the support shaft 40 by receiving power from the capstan motor CM through the belt in the normal mode (for example, PLAY MODE, REV MODE), the second guide boss 53 and the damper gear 60 is rotationally driven at a predetermined torque by the viscous force of the oil 80 interposed between the damper gear 60 and the second guide boss 53. [

At this time, the direct drive lever 100 is in an unactuated state, so that the engagement protrusions 54 and 72 of the clutch wheel 70 and the reel pulley 50 are not engaged with each other.

In this state, the direct drive lever 100 is actuated to press the clutch wheel 70 downward when the vehicle is in the high speed mode, for example, (FF MODE, REW MODE) And the engaging protrusion 72 provided on the lower surface thereof is engaged with the engaging protrusion 54 provided on the upper surface of the reel pulley 50.

Therefore, the power from the capstan motor CM is directly received, thereby realizing the high-speed mode.

As described above, according to the reel driving apparatus of the tape recorder of the present invention, since the unidirectional spring and the spring holder are not necessary, it is possible to reduce the unit cost due to the reduction in the number of parts. In particular, friction between the damper gear and the reel pulleys So that a stable torque force can always be obtained even when driving is performed for a long time. Therefore, it is possible to improve the reliability of the tape recorder employing it.

Claims (3)

A reel driving device of a tape recorder for rotatably driving a pair of reel tables by receiving power from a capstan motor located on one side of a main chassis through a belt, A bracket 20 having a support boss 30 protruded upward from one side thereof; A support shaft 40 fixedly mounted on the support boss 30; A belt groove 51 is formed on the outer circumferential surface of the support shaft 40 so as to receive power transmitted from the capstan motor CM through a belt, A reel pulley 50 in which guide bosses 52 and 53 are extended; A damper gear (60) interposed between the second guide boss (53) of the reel pulley (50) so as to hold a predetermined gap therebetween; A clutch wheel 70 rotatably coupled to the first guide boss 52 of the reel pulley 50 by rotation of the damper gear 60 while being inserted into the first guide boss 52 so as to be movable up and down; An oil 80 flowing between the damper gear 60 and the second guide boss 53 to generate a frictional force between the damper gear 60 and the second guide boss 53; A spring (90) interposed between the clutch wheel (70) and the upper surface of the reel pulley (50) to elastically support the clutch wheel (70) upward; And a reel driving device for rewinding the tape recorder. The apparatus according to claim 1, wherein the support boss (30) provided on the bracket (20) is integrally formed through an outsert. The damper gear (60) according to claim 1, characterized in that it is provided between the inner circumferential surface of the clutch wheel (70) and the outer surface of the damper gear (60) so as to guide upward and downward movement of the clutch wheel Wherein a plurality of guide grooves (61) and guide projections (71) are selectively provided along the longitudinal direction.