KR20010080808A - Videocassette recorder - Google Patents

Abstract

PURPOSE: A video cassette recorder is provided to supply an image of high quality through restraining an repressing elastic deformation of a spring clutch member. CONSTITUTION: By a rotation of a capstan motor in a play mode, a driving belt(12) combined to the capstan motor rotates a driving pulley toward an identified direction with the capstan motor. A second spring clutch member(21) is fixed on a spring holder(17). Thus, the driving pulley and the spring holder are integrally rotated. A first spring clutch member(19) is slipped on a winding surface of the spring holder for transferring driving force to a driving gear(25). Herein, an operation portion(20a) of the first spring clutch member is contacted to a driving force transferring unit(26d) of the driving gear. Thus, elastic transformation is repressed to reduce repulsive force toward the capstan motor.

Description

Video cassette recorder {VIDEOCASSETTE RECORDER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder, and more particularly, to a video cassette recorder capable of suppressing a reaction force acting in a direction opposite to a rotation direction of a capstan motor by suppressing elastic deformation of a one-way spring clutch member. will be.

1 is a longitudinal sectional view of a one-way sprinkler member region of a conventional video cassette recorder. As shown, the video cassette recorder includes a support shaft 111 disposed vertically along the up and down direction, an electric pulley 113 coupled to rotate relative to the support shaft 111, and an electric pulley 113. A spring holder 117 coupled to be rotatable relative to the first spring, and a first spring clutch member 119 and a second wound around the circumferential region of the spring holder 117 in one direction and slipped in the other direction, respectively; The spring clutch member 121, the electric gear 125 is coupled to one side of the spring holder 117 so as to be relatively rotatable with respect to the support shaft 111, and are mutually engaged with each other with a different speed ratio from the electric gear 125. It has an idler gear 129.

The circumferential surface of the electric pulley 113 is coupled to one side of the electric belt 112 coupled to the capstan motor (not shown), the hub 114a is formed in the center region to accommodate the support shaft 111 It is. A locking jaw 114b is formed in the circumferential region of the hub 114a to support the spring holder 117 along the axial direction of the support shaft 111, and on one side thereof, along the axial direction of the support shaft 111. An engagement clutch portion 114c protruding to mesh with the electric gear 125 is formed.

The spring holder 117 has a different outer diameter and is formed with a winding surface such that the first spring clutch member 119 and the second spring clutch member 121 can be wound, respectively, and extend along a radial direction in the central region. A bite extension 118 is formed to be engaged with the locking step 114b of the electric pulley 113.

The second spring clutch member 121 is wound on the lower winding surface of the spring holder 117 along the axial direction of the support shaft 111 with a fixed fastening, and one end of the second spring clutch member 121 is in the radial direction. It extends along and is fixed to the locking step 114b with respect to the rotation direction.

The electric gear 125 has first and second tooth portions 126a and 126b formed to be engaged with the idler gear 129 with different gear ratios, and the lower surface has an axis of the support shaft 111. A power transmission unit 126d is formed to extend downward along the direction so as to interact with the first spring clutch member 119. The power transmission part 126d is provided with a through hole in a long hole in an up and down direction, and in this through hole, one end 122a of the first spring clutch member 119 is lifted and accommodated so as to be integrally rotatable. Are combined.

On the outer side of the power transmission part 126d, the engagement clutch part 126c is extended so that it can engage with the engagement clutch part 114c formed in the electric pulley 113, The 1st tooth part 126a and the 1st A switching lever 128 is interposed between the two teeth 126b to raise and lower the electric gear 125 along the axial direction of the support shaft 111.

On the other hand, the driving arm 131 is coupled to the upper side of the electric gear 125 in the axial direction of the support shaft 111 so as to be able to pivot about the support shaft 111. An idler gear 129 is coupled to the free end region of the driving arm 131 so as to be relatively rotatable, and the idler gear 129 is mutually connected to the first and second toothed portions 126a and 126b of the electric gear 125. The third and fourth tooth portions 130a and 130b are formed to be engaged with each other.

By this configuration, when the capstan motor rotates in the play mode, the electric pulley 113 is rotated in the same direction as the capstan motor by the electric belt 112 coupled to the capstan motor.

At this time, the second spring clutch member 121 is wound around the spring holder 117 to be constrained and rotated so that the electric pulley 113 and the spring holder 117 are integrally rotated, and the first spring clutch member ( 119 slips against the winding surface of the spring holder 117 and transmits power to the electric gear 125. The second tooth portion 126b of the electric gear 125 meshes with the fourth tooth portion 130b of the idler gear 129 to rotate to transmit the rotational force of the capstan motor to the take-up reel (not shown).

In the review mode, while the second spring clutch member 121 slips with respect to the spring holder 117, the rotational force is transmitted, and the first spring clutch member 119 rotates to the spring holder 117. And the rotational force of the spring holder 117 is transmitted to the electric gear 125 while integrally rotating.

On the other hand, when the speed ratio between the winding reel and the supply reel (not shown) in the play mode is large, the reaction force with respect to the first spring clutch member 119 of the power transmission unit 126d of the electric gear 125 is increased relatively. As a result, the first spring clutch member 119 is elastically deformed along the radial direction in the region of the first winding 120b extending from one end portion 120a, as shown in FIG. 2. As such, the elastic force is accumulated in the elastically deformed first winding 120b of the first spring clutch member 119, and the accumulated elastic force acts in a direction opposite to the rotation direction of the capstan motor.

In addition, in the review mode, similar to the first spring clutch member 119 described above, elastic deformation of the second spring clutch member 121 is generated, and such elastic deformation acts in a direction of inhibiting rotation of the capstan motor. do.

However, in such a conventional video cassette recorder, no means for suppressing elastic deformation of the first and second spring clutch members 119 and 121 is provided, so that the elastic force of the first and second spring clutch members 119 and 121 is capstan. It acts as a reaction force that inhibits the rotation of the motor, making it difficult to accurately control the capstan motor. Accordingly, there is a problem in that it is difficult to provide a high quality image when outputting a still image or reproducing the image in a slow operation.

Accordingly, it is an object of the present invention to provide a video cassette recorder capable of suppressing elastic deformation of a sprinkler member to provide a high quality image.

1 is a longitudinal sectional view of a one-way sprinkler member region of a conventional video cassette recorder;

2 is an enlarged plan view of the first spring clutch member of FIG.

3 is a cross-sectional view of a one-way spring clutch member region of a video cassette recorder according to an embodiment of the present invention;

4A and 4B are enlarged plan views for explaining a stationary state and an operating state of the first spring clutch member of FIG. 3, respectively.

Explanation of symbols on the main parts of the drawings

11 support shaft 13 electric pulley

16: second elastic deformation suppressing unit 17: spring holder

19: first spring clutch member 21: second spring clutch member

25: electric gear 26d: power transmission unit

27: the first elastic deformation control unit 28: the switching lever

29: idler gear 31: driving arm

33: return spring

The above object, according to the present invention, the support shaft disposed along the vertical direction; An electric pulley disposed to be rotatable about the support shaft; A spring holder coupled to the electric pulley so as to be relatively rotatable; An electric gear coupled to one side of the spring holder along the axial direction of the support shaft so as to be rotatable with respect to the support shaft; It is wound around one side circumferential region of the spring holder and one end is fixed to the electric gear in a rotational direction, thereby being bound to the spring holder during one direction rotation of the spring holder and slipping upon rotation in the other direction, thereby reducing the rotational force of the spring holder. A first spring clutch member transmitting a rotational force transmitted to the electric gear; It is wound in the other peripheral area of the spring holder and one end is arranged to be fixed to the rotation direction of the electric pulley is constrained to rotate the spring holder in one direction rotation of the electric pulley and slips in the other direction to rotate the rotational force of the electric pulley A second spring clutch member for transmitting to the spring holder; It includes an elastic deformation inhibiting portion is disposed at a predetermined interval in the circumferential region of at least one of the first and second spring clutch members along the axial direction of the support shaft to suppress the elastic deformation in the radial direction of the sprinkler clutch member. A videocassette recorder is achieved.

Here, the elastic deformation suppressing portion, the first extending downward from the electric gear in the support axis direction is disposed at a predetermined interval around the first spring clutch member to suppress the elastic deformation of the first spring clutch member. An elastic deformation suppressing portion and a second elastic deformation extending upward from the transmission pulley along the supporting axis direction and disposed at a predetermined interval around the second spring clutch member to suppress elastic deformation of the second spring clutch member; It is preferable to comprise so that a suppression part may be included.

In addition, the first gear clutch is movable in the axial direction of the support shaft, the first engagement clutch portion having an engaging jaw extending upwardly in the axial direction of the support shaft and protruding horizontally in the rotational direction inside the spring holder. And, it is effective to further include a second engagement clutch portion which is extended downwardly to be able to interlock with the first engagement clutch portion from the electric gear.

On the other hand, according to another field of the present invention, the support shaft; A pulley rotatably coupled to the support shaft; A spring holder rotatably coupled to the pulley; An electric gear coupled to one side of the spring holder; It is wound around the spring holder and one end is rotatably disposed to the electric gear to transmit the rotational force of the spring holder to the electric gear while rotating integrally with the spring holder when the spring holder rotates in one direction. A one-way spring clutch member which slips with respect to the spring holder when the spring holder rotates in another direction and transmits the rotational force of the spring holder to the electric gear; The video cassette recorder is disposed in the circumferential region of the one-way spring clutch member and includes an elastic deformation suppressing unit for suppressing elastic deformation along the radial direction of the one-way spring clutch member.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

3 is a cross-sectional view of the one-way spring clutch member region of the video cassette recorder according to an embodiment of the present invention, and FIGS. 4A and 4B respectively illustrate a stop state and an operating state of the first spring clutch member of FIG. 3. It is an enlarged plan view for doing this. As shown in these figures, the video cassette recorder according to the present invention includes a support shaft 11 arranged vertically along the up and down direction, and an electric pulley 13 coupled to be rotatable relative to the support shaft 11. And a spring holder 17 coupled to the electric pulley 13 so as to be rotatable relative to the electric pulley 13, and a first spring clutch wound around the spring holder 17 in one direction and wound in another direction. The member 19 and the second spring clutch member 21, the electric gear 25 is coupled to one side of the spring holder 17 so as to be relatively rotatable with respect to the support shaft 11, and the electric gear 25 It has an idler gear 29 which engages.

The circumferential surface of the electric pulley 13 is coupled to the electric belt 12, one side is coupled to the capstan motor, the hub 14a is formed in the center region to accommodate the support shaft (11). In the circumferential region of the hub 14a, a holder support 15 is formed to be spaced apart from the hub 14a in the radial direction and extend along the axial direction of the support shaft 11 to support the spring holder 17 in rotation. .

The holder holder 15 is coupled to the spring holder 17 so as to be relatively rotatable. The spring holder 17 has a different outer diameter and is formed with winding surfaces so that the first spring clutch member 19 and the second spring clutch member 21 can be respectively wound. In the central area along the longitudinal direction, a bleed extension 18 is formed extending in the radial direction, and the bleed extension 18 is arranged along the axial direction of the support shaft 11 from one side of the electric pulley 13. The extended latching jaw 14b is engaged. An engaging clutch portion 14c is formed on the upper outer edge of the hub 14a along the support shaft 11 line direction.

The second spring clutch member 21 is coupled to the lower winding surface of the spring holder 17 with a predetermined fastening, and one side of the second spring clutch member 21 extends in a radial direction to extend the electric pulley 13. An actuating end 22a fixed to the locking jaw 14b with respect to the rotational direction is formed.

The electric gear 25 has first and second toothed portions 26a and 26b respectively formed to be coupled to the idler gear 29 with different speed ratios, and the lower surface is engaged with the electric pulley 13. The engagement clutch portion 26c is extended downwardly so as to be able to engage with each other along the axial direction of the clutch portion 14c and the support shaft 11.

A switching lever 28 is provided below the electric gear 25 to move the electric gear 25 in the axial direction of the support shaft 11, and above the electric gear 25 an electric gear ( 25 is provided with a return spring 33 for elastically pressing downward.

The drive arm 31 is coupled to the upper region of the support shaft 11 so as to be pivotable about the support shaft 11, and is disposed in parallel with the support shaft 11 at the free end region of the drive arm 31. The idler gear 29 which is engaged with the electric gear 25 and the feeding reel or winding reel not shown at the same time is coupled to the center of the rotating shaft. The idler gear 29 is provided with third and fourth toothed portions 30a and 30b which mesh with the first and second toothed portions 26a and 26b of the electric gear 25, respectively.

On the other hand, the first spring clutch member 19 is coupled to the upper winding surface of the spring holder 17 with a fixed fastener. The first spring clutch member 19 is bound to the spring holder 17 when the spring holder 17 rotates in one direction, and slips with respect to the spring holder 17 when the spring holder 17 rotates in the other direction, thereby providing rotational force of the spring holder 17. Transmission to the electric gear 25. The upper end of the first spring clutch member 19 has a working end portion 20a extending in the radial direction and fixed to the electric gear 25 in the rotational direction to transmit the rotational force.

Correspondingly, the lower end of the electric gear 25 extends along the axial direction of the support shaft 11 and penetrates along the axial direction of the support shaft 11 to act the end 20a of the first spring clutch member 19. A power transmission portion 26d having a long hole through which accommodates the power is formed.

On the opposite side of the power transmission portion 26d with the support shaft 11 therebetween, a predetermined distance G is spaced apart from the outer diameter of the first spring clutch member 19 along the radial direction and along the axial direction of the support shaft 11. A first elastic deformation suppressing portion 27 is formed to extend to suppress elastic deformation along the radial direction of the first spring clutch member 19.

In addition, a second elastic deformation suppressing portion 16 is formed in the transmission pulley 13 so as to suppress elastic deformation along the radial direction of the second spring clutch member 21. The second elastic deformation suppressing portion 16 is extended upward along the axial direction of the support shaft 11 from the electric pulley 13 and spaced apart from the outer diameter of the second spring clutch member 21 by a predetermined distance along the radial direction. It is arranged.

Here, the first elastic deformation suppressing portion 27 and the second elastic deformation suppressing portion 16, respectively, as shown in Fig. 4a or 4b, single or plural extending along the axial direction of the support shaft (11). It may be configured in the form of ribs, it may be configured as an arc-shaped curved surface disposed along the circumferential direction of the first and second spring clutch member 21.

By this configuration, when the capstan motor is rotated in the play mode, the electric pulley 13 is rotated in the same direction as the capstan motor by the electric belt 12 coupled to the capstan motor.

The second spring clutch member 21 is wound and fixed to the circumferential region of the spring holder 17 so that the electric pulley 13 and the spring holder 17 rotate integrally, and the first spring clutch member 19 The power is transmitted to the electric gear 25 while slipping with respect to the winding surface of the spring holder 17.

At this time, the first spring clutch member 19 in which the actuating end 20a is in contact with the power transmission portion 26d of the electric gear 25 is the first elastic deformation suppressing portion 27 as shown in FIG. 4B. By suppressing the elastic deformation along the radial direction by the) will also reduce the reaction force acting on the capstan motor.

In the review mode, the second spring clutch member 21 slips against the spring holder 17 and transmits rotational force. At this time, the second spring clutch member 21 is provided with the second elastic deformation suppressing portion 16. Since the elastic deformation along the radial direction is suppressed by), the reaction force of the second spring clutch member 21 which inhibits the rotation of the capstan motor is also reduced.

As described above, according to the present invention, by providing the elastic deformation inhibiting portion in the peripheral region of each one-way clutch member so that the elastic deformation of the one-way clutch member can be suppressed, the reaction force of the one-way clutch member acting on the capstan motor can be suppressed. Can be. Thereby, a video cassette recorder is provided which can easily control the capstan motor and can provide a high quality image.

In addition, according to the present invention, by engaging the engagement clutch which is formed to engage the electric pulley and the electric gear to each other inside the spring holder, it is possible to increase the radius of the spring holder and each spring clutch member. As a result, a video cassette recorder capable of securing a relatively large transmission torque as compared with the related art and reducing the speed ratio between the clutch member and the spring holder is provided.

Claims (4)

A support shaft disposed along the vertical direction; An electric pulley disposed to be rotatable about the support shaft; A spring holder coupled to the electric pulley so as to be relatively rotatable; An electric gear coupled to one side of the spring holder along the axial direction of the support shaft so as to be rotatable with respect to the support shaft; It is wound around one side circumferential region of the spring holder and one end is fixed to the electric gear in a rotational direction, thereby being bound to the spring holder during one direction rotation of the spring holder and slipping upon rotation in the other direction, thereby reducing the rotational force of the spring holder. A first spring clutch member transmitting a rotational force transmitted to the electric gear; It is wound in the other peripheral area of the spring holder and one end is arranged to be fixed to the rotation direction of the electric pulley is constrained to rotate the spring holder in one direction rotation of the electric pulley and slips in the other direction to rotate the rotational force of the electric pulley A second spring clutch member for transmitting to the spring holder; It includes an elastic deformation inhibiting portion is disposed at a predetermined interval in the circumferential region of at least one of the first and second spring clutch members along the axial direction of the support shaft to suppress the elastic deformation in the radial direction of the sprinkler clutch member. Video cassette recorder characterized by. The method of claim 1, The elastic deformation suppressing part extends downward from the electric gear along the supporting axis direction and is disposed at a predetermined interval around the first spring clutch member to suppress the elastic deformation of the first spring clutch member. A suppression unit and a second elastic deformation suppressing portion extending upward from the transmission pulley along the supporting axis direction and arranged at a predetermined interval around the second spring clutch member to suppress elastic deformation of the second spring clutch member. A video cassette recorder, comprising: The method according to claim 1 or 2, The electric gear is movable up and down along the axial direction of the support shaft, the first engagement clutch portion having an engaging jaw extending upwardly in the axial direction of the support shaft and protruding horizontally in the rotational direction, the inside of the spring holder; And a second engagement clutch portion extending downward from the electric gear so as to be able to interlock with the first engagement clutch portion. A support shaft; A pulley rotatably coupled to the support shaft; A spring holder rotatably coupled to the pulley; An electric gear coupled to one side of the spring holder; It is wound around the spring holder and one end is rotatably disposed to the electric gear to transmit the rotational force of the spring holder to the electric gear while rotating integrally with the spring holder when the spring holder rotates in one direction. A one-way spring clutch member which slips with respect to the spring holder when the spring holder rotates in another direction and transmits the rotational force of the spring holder to the electric gear; And an elastic deformation suppressing portion disposed in a circumferential region of the one-way spring clutch member to suppress elastic deformation along the radial direction of the one-way spring clutch member.