KR920008479B1 - Reel driving device - Google Patents

Abstract

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Description

Reel drive

1 is a plan view for explaining a reel drive unit of a conventional video tape recorder.

2 is an exploded perspective view of a reel drive device according to an embodiment of the present invention.

3 is an assembled cross-sectional view of an embodiment of the present invention.

4 is a schematic side view illustrating the cam action of the embodiment of the present invention.

5 is a schematic side view illustrating the clutch action of the embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: main rotating body 20: frictional rotating body

30: circular rotating body 40: driven rotating body

The present invention provides a tape recorder, comprising: an idler driving mechanism for selectively driving a supply side reel disk and a winding side reel disk on which a tape supply reel and its winding reel are seated, respectively. The low speed drive is driven by the friction force, but the electric torque is driven in accordance with the spherical rotation direction and the high speed drive relates to a reel drive device that can be driven directly by the driving force.

As an example of the tape recorder, the reel driving unit of the video tape recorder will be described. As shown in FIG. 1, the tape T is conveyed in the forward or reverse direction by the supply reel SR and the reel TR, and at the same time the camstan shaft ( Constant speed by CS). The reel disk RD'RD 'of the supply reel SR and the winding reel TR are driven by a driving mechanism D that transmits power of the capstan motor CM that rotates the capstan shaft CS. And selected drive from the idler ID which flows according to the rotation direction. That is, the winding side reel disk RD 'is driven in the direction during forward (clockwise) driving, and the supply side reel disk RD is selectively driven in the reverse direction in the reverse (counterclockwise) driving. . By the way, the winding reel disk RD 'is installed at a distance from the camston motor CM so that the driving side reel disk RD does not require a large driving force (torque) when the tape T is driven forward. Since is installed at a relatively long distance has a significant load in the reverse travel of the tape (T) requires a larger drive torque. In addition, the capstan motor CM rotates at a high speed in a high speed driving mode other than the normal driving (low speed) of the tape to selectively drive the two reel disks RD 'RD' at this time. There should be no slip in the engine and the driving force must be transmitted as it is.

In this way, the torque is varied according to the driving mode, and the frictional transmission or the motive driving state must be appropriately changed according to the driving speed. Such a change is generally performed by the driving mechanism D of the idler.

As an example of a drive mechanism capable of varying torque as described above and having a frictional transmission or a motive driving function, it has been disclosed in Japanese Unexamined Utility Model Publication No. Hei 1-109835. However, there are many components in the quoted content. In particular, since three bolts and four springs are provided for variable torque, there are many power loss, disadvantages in cost, and assembly are very difficult.

The object of the present invention is to provide an excellently simple drive mechanism having one bolt and two springs in view of the conventional problems. It is a further object of the present invention to ensure reliable variable torque drive and prime mover with as little power loss as possible.

The present invention, a reel drive device to achieve the above object has a main rotating body driven from the motor, the boss penetrating the center of the main rotating body and frictionally driven by the surface friction and the boss A motive rotating body having a clutch means coupled to the main rotating body directly from the pressurizing means so as to be integrally rotated integrally with the frictional motor rotating body and selectively driven by a motive force, And a driven rotary body coaxially coupled with a torque variable means for rotating integrally with the main rotating body and the friction motor rotating body to vary the surface friction force between the main rotating body and the clutch means. It can be driven in the configuration, and configured to be driven by a torque variable according to the direction of rotation during friction transmission It characterized.

In the reel drive device of the present invention, the main rotating body can be used as a drive source of the capstan motor for the constant speed of the tape is usually formed in the form of a belt pulley.

A bolt may be interposed between the main rotating body and the friction motor rotating body, and in this case, the torque varying means of the driven rotating body may include a spring for pressing the main rotating body to change the frictional force of the bolt. . And the driven rotating body may be manufactured in the form of a friction or gear, wherein the idler is also used in the form of a friction or gear.

The pressurizing means is, for example, a member interlocked with a separate mode change lever, and can operate in a high speed driving mode (fast forward or rewind). That is, in the normal driving (low speed) mode, the pressurizing means is not operated and the role of the motive rotating body is ignored. Accordingly, the driven rotating body is driven from the frictional rotating body and driven at a predetermined torque. The driven rotating body also has a togg variable means, for example comprising a spring holder which is carried on the spring and the cam and the spring and moved up and down by the cam, in either direction (counterclockwise direction). It consists of a variable (increased) torque by the torque varying means which moves the spring holder to compress the spring when rotating.

In the high-speed driving mode, the above-mentioned pressing means is operated so that the motive rotating body is directly coupled to the main rotating body by the clutch means, and the clutch means is always engaged with the boss of the friction motor rotating body, for example. Compression to couple the main body with a main body, including a clutch coupled to the main rotating body through the rolling element when pressed by the pressing means, and the spring interposed therebetween; By being directly coupled to the driving force to transfer the motive force to the frictional motor rotating body, the driven rotating body is also configured as a motive force. At this time as well, the torque varying means may act according to the rotational direction, but the advantage is ignored.

Thus, the present invention provides a reel driving device that transmits power by friction driving force that exerts a predetermined torque at low rotational speed as a driving force to rotate at high speed, and also transmits power by varying torque according to its rotation direction during frictional transmission. .

Hereinafter, with reference to the accompanying drawings to explain an embodiment of the present invention. The present invention is not limited to the embodiments described below, and of course, many variations are possible within the same technical scope.

One embodiment of the present invention is illustrated in FIG. 2, wherein both the main rotating body 10, the friction driving rotating body 20, the moving rotating body 30, and the driven rotating body 40 are unit assemblies. It is coaxially supported by one support shaft 51 provided on the base 50.

The main rotating body 10 has a belt pulley shape at a predetermined interval around the belt groove 11 formed to surround the belt 52 on the main surface, the boss insertion hole 12 drilled in the center, and the boss insertion hole 12. It has a plurality of protrusion insertion holes 13 formed.

The two-stage boss 21 is formed in the frictional electric rotating body 20 so that the large diameter portion 21a is fitted to the boss insertion hole 12 of the main rotating body 10 so that the small diameter portion 21b is idle. One or a plurality of engaging projections 21c are formed in the lower half of the upper surface thereof, and a bolt 22 is attached to the upper surface thereof so as to be rubbed on the bottom surface of the main rotating body 10.

The main rotating body 10 has a small diameter portion (21b) of the boss 21 of the frictional motor rotating body 20 is projected on the upper surface is coupled to the motive rotating body 30, the driving rotary body 30 Is a boss coupling hole 31a corresponding to the shape of the lower half of the small diameter portion 21b, a plurality of engaging hooks 31b protruding at a predetermined height around the plurality of protrusions, and a plurality of protrusions coinciding with the protrusion insertion holes 13; Interposed between the clutch 32 and the rolling element 31 and the clutch 32 that support the plurality of protrusions 32a that can be inserted into the protrusion insertion hole 13c through the through hole 31c. The clutch 32 is pushed downward by engaging the clutch springs 33 which raise the clutch 32 and the protrusion 32a is always engaged only with the projection tube 31c of the rolling element 31. Has a clutch means that is directly coupled with the main rotating body (10).

Coupled to the boss 21 of the frictional electric rotating body 20 is driven by friction, and the driven rotating body 40 is a ring-shaped, a plurality of guide support 41b is formed in the main surface 41a is formed in the main surface and extends below it (B) a boss indenting hole (42a) press-fitted into the upper half of the small diameter portion (21b) of the boss (21) as a tubular body that is rotatably coupled in the hollow portion of the rotor body (41) having the rotor body (41). ) Is formed and has a cam 42 on which the inclined cam surface 42b is processed, and a cam groove 43a interlocked with the inclined cam surface 42b, and a guide groove 43b which is combined with the guide support 41a. It has a) and the fluid 43 which is regulated to the upper and lower two-level height according to the rotation, and the torque-variable spring 44 interposed between the fluid 43 and the upper surface of the rolling element (32).

As a preferred configuration, it is preferable that the main rotating body 10 and the rolling element 31 are finely spaced, and for this purpose, a polywasher having a small friction coefficient is interposed therebetween.

3 shows the assembled state of the reel driving device. When the main rotating body 1 is driven by the belt 52, the torque for the frictional rotating body 20 to press the main rotating body 10 from above is When driven by a predetermined frictional force by the variable spring 44 and the bolt 22 frictioned therebetween, the driven rotating body 40 is driven by this frictional driving force. At this time, the driven rotating body 30 is also driven by the friction driving force, and a driven body (eg, an idler) is engaged with the rotating body main body 41 of the driven rotating body 40 by reference. Slip occurs in the bolt 22 when the spring 44 is larger than the frictional force by the bolt 22. That is, the driven rotating body 40 is driven within a predetermined load range, but when driven clockwise, the cam protrusion 43a of the fluid 43 is formed on the cam 42 like the solid line of FIG. It is located at the top height of the inclined cam surface 42b and the spring 44 is not compressed so that its elasticity is relatively weak. Therefore, at this time, the friction driving force is not so great that it is suitable for driving light loads. However, when driven counterclockwise, the cam protrusion 43a is lowered to the lower end position of the inclined cam surface 42b as shown in the imaginary line portion of FIG. 4, thereby exerting a large elastic force. Therefore, the frictional driving force in this case is relatively strong, so that the driven body can be driven back as the increased torque, thereby driving the heavy load.

On the other hand, as shown in FIG. 5, the upper surface of the clutch 32 of the prime mover 30 is provided with a pressing member 54 which is operated by a lever by a separate moving member 53. When the 32 is lowered, the main pivot that extends below the plurality of projections 32a coupled to the projection through holes 31c of the rolling element 31 passes through the through holes 31c and coincides thereunder. It is inserted into the projection insertion hole 13 of the whole (10) and eventually the rotator 30 is driven directly by the motive force of the main rotator 10 and the motive force is transmitted to the triaxial friction motor rotator 20 do. Therefore, the frictional electric rotating body 20 is driven by a motive force irrespective of the frictional force on the spiral torque variable spring 44, and thus, all the driven rotary bodies 40 are driven by the motive force. When the pressing member 54 returns to its original position, the clutch coupling between the motive rotating body 30 and the driven rotating body 10 is terminated by the clutch spring 33 so that the friction motor rotating body 20 and the The driven rotating body 40 is brought into a state of being driven by friction again.

As described above, the present invention enables frictional transmission to different torques according to the rotational direction by a driven rotating body having a torque variable means, and directly driven by a driving force by a driving rotary body having a clutch means and an auxiliary device thereof. This makes it possible to provide a reel drive with a simple spring with two bolts and two bolts. This is an extremely effective invention that reduces cost, improves assembly, reduces power loss, and ensures reliable power transmission to improve product reliability. .

Claims (3)

A main rotating body driven by a motor, a boss penetrating the center of the main rotating body, and a friction motor rotating body frictionally driven by its surface friction, and coupled to the boss to rotate integrally with the friction motor rotating body. And a primary rotating body having a clutch means that can be directly coupled with the main rotating body from the pressurizing means so as to be selectively driven by the driving force, and coupled to the boss to rotate integrally with the friction motor rotating body, A driven rotating body having a torque variable means for varying the surface friction force between the frictional motor rotating bodies is coaxially coupled, so that the driven rotating body can be driven by frictional or motive power by the clutch means, and the rotation thereof during frictional transmission. A reel drive device, characterized in that configured to be driven with a torque variable according to the direction. According to claim 1, The cylindrical rotor having the clutch means is a plurality of rolling elements that are always coupled and driven to the frictional motor rotating body, a plurality of coupled to the rolling member is penetrated to the main rotating body when descending And a clutch having a protrusion, and a spring interposed between the rolling element and the clutch to prevent the clutch from falling, the reel driving device configured to transmit a motive force by the lowering of the clutch. The driven rotor according to claim 1, wherein the driven rotor having the torque varying means includes a rotor main body, a cam rotatably coupled to the rotor main body and coupled to and driven by the friction motor, and a rotational direction of the cam. And a spring for lifting and lowering the fluid and a spring for preventing the lowering of the fluid and for providing friction to the friction motor, so that the driving torque is varied by the spring. Reel drive, characterized in that coupled.

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