KR19980084448A - Reel Driving Device of Magnetic Recording Player - Google Patents

Abstract

The present invention forms two gears with different diameters at the lower part of the supply reel so that the idler gears are directly coupled to the feed reel, so that the reel ratio of the feed reel side between the regeneration mode and the fast rewind mode can be changed to allow high-speed rewinding. A reel driving device of a magnetic recording and reproducing apparatus which ensures the reliability of gear connection through the rotation angle control of an idler at the time of conversion.

The reel driving device of the present invention is a driven pulley that receives the rotational driving force from the capstan pulley through the belt, a support plate rotatably supported on the rotation axis of the driven pulley, and an output gear and gear of the driven pulley installed at the outer end of the support plate. The driving force is applied to a pair of idler gears forming a coupling, a feed reel having a large gear and a gear reel formed by rotating the idler gears, an idler driving lever and idler driving lever controlling the rotation of the idler. The idler lever control cam is provided to combine the structure.

Description

Reel Driving Device of Magnetic Recording Player

1 is a plan view of a reel driving device of a conventional magnetic recording and reproducing apparatus.

2 is a longitudinal cross-sectional view of the device of FIG.

3 to 8 show the structure of a reel driving device according to an embodiment of the present invention.

3 and 4 are a plan view and a longitudinal cross-sectional view in the REW mode, respectively,

5 and 6 are a plan view and a longitudinal sectional view of the brake state, respectively.

7 and 8 are plan and longitudinal cross-sectional views, respectively, in the REV mode.

* Explanation of symbols for main parts of drawings *

20.Capstan pulley belt

22. driven pulley Support plate

24, 24 '. Idler Gear 25. Idler assembly

26. Supply reel 26a. Wait

26b. Small gear 27. Idler Drive Lever

28. Idler lever control cam Reel

31.Cam groove F / R lever

The present invention relates to a reel driving device of a magnetic recording and reproducing apparatus. More specifically, the feed reel side between the regeneration mode and the fast rewind mode is formed by forming two gears having different diameters on the supply reel to selectively engage the idler gears. The present invention relates to a reel driving apparatus of a magnetic recording and reproducing apparatus which enables high-speed rewinding with a difference in the reduction ratio, and ensures the reliability of gear connection by controlling the rotation angle of the idler during mode switching.

An example of a reel driving device of a conventional magnetic recording / playback apparatus will be described with reference to FIGS. 1 and 2 as follows. First, FIG. 1 is a plan view of a reel driving apparatus of a conventional magnetic recording and reproducing apparatus, and FIG. 2 is a longitudinal sectional view of the apparatus of FIG.

As shown, in the conventional reel drive device, two clutch gears 3 and 3 ', which are in gear engagement with each of them, are positioned between the supply reel 1 and the take-up reel 2, and the clutch Between the gears 3 and 3 'is an idler gear 4 which selectively transmits power to either of the two clutch gears 3 and 3', while the idler gear 4 is a capstan pulley. (5) It takes the structure which makes gear engagement with the driven pulley 6 which receives power from.

At this time, the belt 7 is connected between the capstan pulley 5 and the driven pulley 6 so that the rotational driving force from the capstan motor is transmitted to the driven pulley 6. Then, one side of the driven pulley 6 is equipped with an F / R lever 8 as a high-speed winding (FF / REW) mode switching lever, and one end is pivotally mounted on the rotation shaft 6a of the driven pulley 6. In addition, the other side is configured to vertically drive up and down the idler arm 9 on which the idler gear 4 is supported.

On the other hand, in the conventional reel drive device to look at the coupling relationship between the gears according to Figure 2, the output gear 6a of the driven pulley 6, which is supported on one end of the rotation center shaft on the chassis 10 is an idler gear The clutch gear 3 which is in gear engagement with the input gear 4a of (4) and is also supported on the chassis 10 by the center of rotation has an output gear 3a, felt ( 11), the first input gear 3b, the spring 12, and the second input gear 3c are sequentially coupled so that the first and second input gears 3b and 3c are positioned vertically of the idler gear 4. Is selectively coupled to the output gear 4b and the input gear 4a, while the output gear 3a of the clutch gear 3 is provided with a supply reel gear 1a formed under the supply reel 1; It is composed of gears.

In the figure, reference numeral 13 denotes a substrate (PCB).

In the conventional reel driving device, in the high speed winding mode (REW / FF), in the constant speed mode (PLAY / REV) by the selective coupling of the large and small gears formed in the clutch gear 3 and the idler gear 4 respectively. Compared to the two clutch gears 3 (2) on both sides of the idler gear 4, although the rotational speed of the supply reel 1 can be greatly increased, it is easy to adjust the speed ratio in the high speed mode and prevent tape damage. 3 '), the number of parts is increased to increase the material cost as well as poor assembly ability has been pointed out.

Meanwhile, a reel driving device using only one clutch is known as a reel driving device different from the conventional reel driving device described above. In such a reel driving device, in order to prevent damage to the tape due to the characteristics of the tape traveling system, In regeneration mode, the gear diameter of the take-up reel is smaller than the feed diameter of the feed reel in order to make a difference in torque between the feed reel and the take-up reel. The rotational speed of the supply reel is low, which is a disadvantage in that the structure is not suitable for high-speed rewind (REW). That is, in the conventional reel drive apparatus of the single clutch system, it is difficult to take a large ratio of the supply reels.

Accordingly, the present invention is to solve the above-mentioned problems which are pointed out in the reel driving apparatus of the conventional magnetic recording and reproducing apparatus, by forming two gears of different diameters in the supply reel to reproduce the idler gears selectively coupled thereto. The purpose of the present invention is to provide a reel driving device of a magnetic recording and reproducing apparatus which enables high speed rewinding by varying the feed reel shaft reduction ratio between the mode and the fast rewind mode, and ensures the reliability of the gear connection through the control of the rotation angle of the idler. I put it.

The object of the present invention is a pair of driven pulleys receiving the rotational driving force from the capstan pulley through the belt and the outer end of the support plate which is rotatably supported on the rotation side of the driven pulley to form a gear coupling with the output gear of the driven pulley. An idler assembly consisting of an idler gear of the idler, a gear coupling with one side of the idler gear by rotation of the idler assembly, a feed reel provided with a small gear, and an idler drive lever and idler drive lever for controlling rotation of the idler assembly. The idler lever control cap providing the driving force is achieved by the organically coupled structure.

Such matters relating to the object and technical configuration of the present invention and the effects thereof will be clearly understood by the following detailed description with reference to the drawings showing preferred embodiments of the present invention.

3 to 8 show the structure of one embodiment reel driving apparatus of the present invention. FIGS. 3 and 4 are a plan view and a longitudinal sectional view in REW mode, respectively. 9 and 8 are plan and longitudinal cross-sectional views in the REV mode.

First, referring to FIG. 3 and FIG. 4, the structure of the reel driving device of the present invention is as follows. As shown, the reel drive of the present invention is driven on the driven pulley 22, which receives the rotational driving force from the capstan pulley 20 through the connection by the belt 21, on the rotary shaft 22a of the driven pulley 22 Idler assembly (25) which is provided on both outer ends of the support plate (23) rotatably mounted on the support plate (23) and is engaged with the output gear (22b) of the driven pulley (22). And a feed reel 26 provided with small gears 26a and 26b which is in gear engagement with one side idler gear 24 by the rotation of the idler assembly 25 and the rotation of the idler assembly 25. It consists of an idler drive lever 27 and a idler lever control cap 28 and a winding reel 29 for providing a driving force to the idler drive lever 27.

At this time, one end of the support plate 23 of the idler assembly 25 extends downwardly so that the engaging projection 23a is formed so as to fit in the recess 27a formed on one side end of the idler drive lever 27. The guide protrusion 27b formed on the other end of the idler drive lever 27 rotatably fixed to the bottom surface of the elevating plate 30 is inside the cam groove 31 formed on the bottom surface of the idler lever control cam 28. It is configured to be inserted.

The cam groove 31 is a second cam groove portion 31b and a second cam groove portion as a narrow hop portion which is in close contact with and communicates with the first cam groove portion 31a and the first cam groove portion 31a having a large rectangular area. It consists of the 3rd cam groove part 31c formed in the end side of the bending hole part extended clockwise from the 31b.

On the other hand, between the upper surface of the driven pulley 22 and the upper one side of the elevating plate 30, the F / R lever 32 as a high-speed winding mode switching lever is mounted, and the idler including the driven pulley 22 by its driving. The gears 24 and 24 'are formed to move up and down.

In addition, the supply reel 26 is rotatably installed on the base plate 33, and the lower portion of the supply reel 26 is the same as the air gear 26a and the small gear 26b having different diameters. It is formed up and down about the rotational center axis and is configured to achieve gear engagement or to be in a disengaged state according to the rotation angle of the idler gear 24.

Looking at the coupling structure and the operation of the gears for each mode of the reel drive device of the present invention as follows.

First, FIGS. 3 and 4 are plan and cross-sectional views of the reel driving device in the REW mode as the fast rewind mode. As shown, at this time, the F / R lever 32 is operated to operate the driven pulley 22. The idler assembly 25 is lowered, and the guide protrusion 27b of the idler drive lever 27 in the cam groove 31 of the idler lever actuating cam 28 is lower left of the first cam groove 31a. As it is located in the idler gear 24 of the idler assembly 25 in conjunction with the idler drive lever 27 is in gear engagement with the small gear (26b) of the supply reel (26).

Accordingly, in the REW mode, the rotation of the supply reel 26 by the reel drive device of the present invention is transferred from the capstan pulley 20 to the idler gear 24 geared thereto via the output gear 22b of the driven gear 21. The transmitted rotational driving force is made by being transmitted to the small gear 26b of the supply reel 26, and the reverse rotation speed of the supply reel 26 at this time is maintained at a relatively high speed.

In the FF mode, on the other hand, the guide protrusion 27b is positioned at the portion A indicated by the dotted line on the upper left side of the first cam groove 31a in FIG. 3 so that the idler assembly 25 rotates in the clockwise direction. ') Is connected to the gear of the winding reel (29).

Next, when switching from the REW mode to another mode in FIGS. 3 and 4, for example, when switching to the REV mode or the regeneration mode, the gears 26b of the supply reel 26 are geared to the gears. The idler gear 24, which has been engaged with the idler gear 24, is engaged with the idler gear 26a on the upper side thereof. In the present invention, the idler gear 24 is moved to another mode through the neutral state as shown in FIGS. 5 and 6 as a means for securing the reliability of the gear connection during the mode change. The transition is being made.

That is, in the reel drive of the present invention, as shown in FIGS. 5 and 6 at the time of switching from the previous mode to another mode, the idler gear 24 is provided with the standby gear 26a of the supply reel 26 and The so-called brake state is placed so as to be located away from the small gear 26b.

In such a brake state, the guide protrusion 27b in the cam groove 31 is positioned in the second cam groove portion 31b by the operation of the idler lever control cam 28, and thus the idler assembly 25 is clockwise. By rotating by a predetermined angle, the idler gear 24 is kept spaced apart from the large and small gears 26a and 26b of the supply reel 26 by a predetermined interval.

Next, FIGS. 7 and 8 show a reel driving device in a REV mode. As shown, in the REV mode, the F / R lever 32 holding the idler assembly 25 downward is repositioned. As the 25 is raised, the horizontal position of the idler gear 24 maintains the horizontal position coinciding with the standby gear 26a of the supply reel 16, and the idler drive lever is operated by the operation of the idler lever control cam 28. The guide protrusion 27b of the 27 is positioned in the third cam groove 31c, and thus the idler assembly 25 is rotated in the clockwise direction so that the idler gear 24 is supplied to the standby gear (26) of the feed reel 26. 26a).

As a result, the rotational driving force transmitted to the idler gear 24 through the driven pulley 22 rotates the air gear 26a of the supply reel 26, so that the rotation of the supply reel 26 is achieved. At this time, the rotational speed of the supply reel 26 is maintained at a much lower rotational speed than in the REW mode as shown in the third and fourth degrees.

As described above, in the reel driving device of the magnetic recording and reproducing apparatus of the present invention, the idler gear 24 provided to be rotatable within a predetermined range with respect to the driven pulley 22 has a different diameter at the lower part of the supply reel 26. Due to the alternative coupling to the formed large and small gears 26a and 26b, the rotation speed of the supply reel 26 in the REW mode can be made much larger than in the regeneration mode or the REV mode through a simple structure. There is this.

In addition, the reel driving device of the present invention has the advantage of improving the reliability of the gear connection by controlling the idler to maintain a neutral state by the operation of the idler lever control cam during mode switching.

Claims (4)

The driven pulley receives the rotational driving force from the capstan pulley, An idler assembly consisting of a support plate rotatably installed on a rotating shaft of the driven pulley and an idler gear which is geared to the output gear of the driven pulley and installed on an outer side of the support plate; The feed reel provided with a large gear and the gear is engaged with the idler gear by the rotation of the idler assembly; A reel drive device for a magnetic recording and reproducing apparatus, characterized by comprising an F / R lever for moving an idler assembly up and down. An idler assembly consisting of a support plate rotatably installed on a rotating shaft of the driven pulley and an idler gear which is geared to the output gear of the driven pulley and installed on an outer side of the support plate; An idler drive lever for controlling rotation of the idler assembly; A reel driving device of a magnetic recording and reproducing device, characterized in that it comprises an idler lever control cam that provides a driving force to an idler driving lever. The method of claim 2, wherein one end of the support plate is formed with a coupling protrusion, the idler lever control cam is formed with a cam groove, one end of the idler driving lever is formed with a groove portion, while the other end is formed with a guide protrusion is the coupling A reel driving device of a magnetic recording and reproducing apparatus, characterized in that the protrusion is coupled to the recess and the guide protrusion is configured to be inserted into the cam groove. 4. The cam cam according to claim 3, wherein the cam groove has a first cam groove for controlling the idler gear to be coupled to the small gear of the supply reel, and a second cam groove for controlling the idler gear to be in a neutral position away from the large gear of the supply reel. And a third cam groove portion for controlling the idler gear to engage with the standby gear of the supply reel.