JPS63166054A - Reel mechanism for tape player - Google Patents

Abstract

PURPOSE:To make the take up force of a supply side reel and a take up side reel equal with simple structure, by forming the diameter of a supply side reel gear larger than that of a take up side reel gear, and setting a gear ratio of an idler gear to each reel gear so as to be larger by frictional resistance. CONSTITUTION:Since the diameter of the supply side reel gear 1a is formed larger than that of the take up side reel gear 2a, the gear ratio to the idler gear 3 arranged between both reels becomes larger than the ratio to the supply side reel gear 1a. The size of the diameter of the supply side gear 1a is formed so that the take up force of the supply side reel can be increased by a share equivalent to the reduction of the take up force due to the frictional resistance of a guide roller or a post provided between a drum head and other capstan shaft, and the supply side reel. In such a way, it is possible to set the take up forces equal at the time of searching in a forward and a backward directions, and the balanced take up of the tape can be obtained with simple constitution.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a tape player for digital audio, video, etc., and particularly relates to a reel mechanism of a tape player used for winding a tape. This is related.

(Prior Art) In general, in a videotape player, the reach is
This allows you to search for a desired image at high speed while looking at the screen. Therefore, when searching, it is necessary to run the tape at high speed with the tape in contact with the head and with a rough image appearing.

Search also includes forward reach, in which the image changes in the same direction as the play, and reverse reach, in which the image moves backwards at high speed.

This point will be explained using the conventional tape player shown in FIG. That is, a tape supply reel 1 is provided on the left in the figure, a take-up reel 2 is provided on the right, and an idler gear 3 is provided between them. This idler gear 3 is provided via a shaft 6 at the tip of an arm 5 that rotates left and right around a shaft 4. In particular, there is a space between the idler 3 and the arm 5 that resists rotating paper such as friction and magnetic resistance. is configured so that it exists.

At the base end of this arm 5, a drive gear 7 which is rotated forward and backward by a motor is provided coaxially with the shaft 4.

A drum head 8 is provided at a position apart from the left and right reels 1 and 2, and a capstan shaft 9 and a pinch roller 10 that press against the capstan shaft 9 are arranged on the take-up reel 2 side of the drum head 8. Drum head 8 from both reels 1°2,
A plurality of rollers and guide posts are provided between the capstan shaft 9 and the pinch roller 10, and the tape T is guided by these.

In such a tape player, in the case of a normal search, the motor first rotates in the normal direction, and the drive gear 7 accordingly rotates in the normal direction, so that the idler 3 meshed with the drive gear 7 rotates. At this time, since there is friction or other resistance between idler gear A73 and arm 5, arm 5
It also rotates in the rotational direction of the drive gear 7, and the idler gear 3
meshes with the take-up reel 2 to rotate it. Towed by the capstan shaft 9 and pinch roller 10, which rotate in the normal direction at the same time, the tape T runs from the supply reel 1 through various guide rollers and posts, comes into contact with the drum head 8, and is then driven by the idler 3. Take-up reel 2
It is wound up. On the other hand, during reverse rotation, the arm 5 is swung toward the supply reel 1 by the reverse rotation of the drive gear 7, and the supply reel 1 is rotated in the winding direction by the idler 3. 9 and the bottom of the tape pulled out by the pinch roller 10 is the drum head 8.
and various guides [1-ra, etc.], and is wound onto a supply reel driven by an idler gear 3.

(Problems to be Solved by the Invention) By the way, in the conventional tape player as described above, the distance from the supply side reel 1 to the capstan N9 is larger than the distance from the take-up side reel 2 to the capstan shaft 9. but,
There are a large number of guide rollers and posts for guiding the tape T to the drum head 8, and their frictional resistance is large, and in addition, there is also frictional resistance of the drumhead 8 itself. Therefore, the supply reel 1, which winds the tape T in a reverse search, has greater resistance during winding than the winding reel 2, which winds the tape T in a forward search, and requires a correspondingly larger winding force. .

However, in the conventional tape player, the diameters R1 and R2 of the reel gears provided on the supply side reel 1 and the take-up side reel 2 are
are equal, so when both reels 1 and 2 are wound up with the driving force from the idler gear 3 having the same diameter, the winding force of the supply side reel 1 is lost by the amount of frictional resistance mentioned above, and the winding force of both reels 1 and 2 is There was a problem that the winding became unbalanced.

In order to solve this problem, it is possible to provide an idler for each reel that is linked to the drive gear, and to make the diameter of the idler different depending on the winding force of each reel.
The number of idlers increases and a switching mechanism is also required, making the structure of the tape player complex.

The present invention solves the problems of the prior art as described above, and provides a reel l for a tape player which has a simple structure and has an equal winding force on both reels during forward and reverse searches.
The purpose is to provide aMQ.

[Structure of the Invention] (Means for Solving the Problems) The reel mechanism of the tape player of the present invention uses one idler gear that interlocks with the drive gear 7, and the reel gear of the supply reel that meshes with this idler gear. The diameter of the idler gear and each reel gear is made larger than the diameter of the reel gear on the take-up side, and the gears of the idler gear and each reel gear are The ratio is set.

(Function) In the present invention having the above configuration, the tape winding force of the supply reel is set to be as large as the frictional resistance of the drum head, etc., so that there is no frictional resistance on the tape when the tape is reversed. However, as a result, the tape winding force of each reel becomes equal during forward search and reverse reach, and the unbalance of winding force between the two reels can be resolved.

(Example) An embodiment of the present invention will be explained in detail with reference to FIG.

Note that the same parts as in the conventional type shown in FIG. 2 are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the supply side and take-up side reel 1゜2 have the same diameter, but the diameters R1 and R2 of the respective reel rods 171a and 2a provided integrally therewith are The side reel gear 1a is set larger than the take-up side reel gear 2a. Therefore, the gear ratio of the supply side reel gear 1a to the idler gear 3 disposed between the reels 1 and 2 is larger. This gear ratio ratio,
In other words, the supply side reel rod i? The diameter of 1a should be increased by an amount commensurate with the reduction in winding force due to the frictional resistance of the guide rollers and posts provided between the drum head 8 and other capstan shafts 9 and the supply reel 1. The dimensions are such that the winding force of the reel 1 is large.

In this embodiment having the above-mentioned configuration, although the same idler gear 3 is used, the winding force of the supply reel increases as the diameter of the reel gear is larger, and the winding force on the supply side reel increases due to the larger diameter of the reel gear. The influence of frictional resistance of the drum head 8 and the like can be eliminated. In this case, the rotational speed of the supply reel 1 is slower than the rotational speed of the take-up reel, but in the case of forward and reverse V-chip, the tape feeding speed is controlled by the capstan shaft 9 and the pinch that presses against it. The winding speed of the reel is usually faster than the feeding speed of the tape, and the difference in speed between the two is generally absorbed by a friction gear, etc. installed between the reel and the reel gear or between the motor and the drive gear. Therefore, the difference in rotational speed between the two gears as in this embodiment is absorbed by such a friction portion, and does not adversely affect the winding speed of the reel.

[Effects of the Invention] As described above, according to the present invention, the reel winding force can be set equally during both forward and reverse searches by simply increasing the diameter of the reel gear of the supply reel. It is possible to provide a reel mechanism for a tape player that allows well-balanced tape winding with this configuration.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the reel mechanism of the present invention;
FIG. 2 is a plan view showing an example of a conventional reel mechanism. 1... Supply side reel 1a... Supply side reel gear, 2
... Take-up side reel, 2a... Take-up side reel gear, 3
...Idler gear, 4...Idler gear shaft, 5...
・Arm, 6... Arm shaft, 7... Drive gear, 8
...Drum head, 9...Capstan shaft, 10.
...Pinch roller, T...tape.

Claims (1)

[Scope of Claims] a. A single idler gear is provided between the tape supply reel and the take-up reel, which meshes with the reel gear of each reel and selectively transmits rotation from the drive gear. b. The supply reel and the take-up reel are provided with supply and take-up reel gears for driving them. c. The diameter of the supply reel gear that meshes with the idler gear is larger than the diameter of the take-up reel gear, and the idler gear and Set the gear ratio of each reel gear. A reel mechanism for a tape player, characterized in that it has the configuration requirements a to c above.