JPH081720B2 - Loading pole drive mechanism for magnetic recording / reproducing device - Google Patents

Description

The present invention relates to a technique for improving the internal mechanism of a magnetic recording / reproducing apparatus such as a video tape recorder.

(Prior Art) FIG. 8 is a diagram for explaining the operation of the loading pole. The magnetic tape 101 of the tape cassette 100 includes a loading reel side loading pole (hereinafter referred to as “left loading pole”) 102 and a take-up reel side loading. A pole (hereinafter referred to as “right loading pole”) 103 is pulled out in the direction of the arrow and wound around the head drum 104. In the figure, 105 is a tension pole for applying proper tension to the magnetic tape, and 106 is a middle pole, which move in the directions of the arrows.

By the way, as a mechanism for moving the pair of loading poles 102, 103 in the arrow direction, a loading ring system and a link system are known.

FIG. 9 is a perspective view of a conventional example related to a loading ring system, which is a system in which two ring gears 111 and 112 are vertically arranged with a certain gap, and an upper ring gear 111 is engaged with a right loading pole 103. The left loading pole 102 is engaged with the lower ring gear 112.

Illustrated motor 113 → pulley 114 → worm 115 → wheel 1
The lower ring gear 112 rotates (arrow) by transmitting power through the route of 16 → first gear 117 → lower ring gear 112.
The left loading pole 102 into the guide groove B on the chassis.
Move along 1 in the direction of the arrow.

On the other hand, the first gear 117 simultaneously drives the inner second gear 118, and the second gear 118 → the third gear 119 → the upper ring gear 111.
The upper ring gear 111
Rotates (arrow) to move the right loading pole 103 in the direction of the arrow along the guide groove B2 of the chassis.

FIGS. 10 (a) and 10 (b) are plan views showing a conventional example of the link system. In this system, the spiral grooved disk 122 that rotates about 1.5 times around the shaft 121 and the spiral groove 123 at one end are shown.
Slides on the shaft 124 and swings around the shaft 124.
And the gear portion 125 of the arm member 126.
A first gear 128 that meshes with and that rotates about a shaft 127; and a second gear 130 that rotates about a shaft 129 by this gear 128,
The first link 131 driven by the first gear 128, the left loading pole 102 driven by the first link, and the second link
It comprises a second link 132 driven by a gear 130 and a right loading pole 103.

When the disk 122 is turned in the direction of the arrow, the first gear 128 rotates right and the second gear 130 rotates left, and as a result, the left and right loading poles 102 and 103 are respectively drawn from the bottom to the top along the guide grooves B1 and B2 of the chassis. Move to (Fig. 10 (b)).

(Problems to be Solved by the Invention) In the loading ring method, since the ring gears are arranged vertically and separately, the height dimension of the mechanism increases,
It is difficult to miniaturize the magnetic recording / reproducing apparatus.

Further, the link method is thinner and has better driving efficiency than the loading ring method, but the swing range of the arm member and the link is large, and other parts cannot be arranged in this range, so that the magnetic recording / reproducing apparatus can be downsized. Have difficulty.

(Means for Solving the Problems) In order to solve the above problems, the present invention relates to a loading ring and one of the loadings that is pin-connected to the loading ring and is directly driven by the ring and has a large amount of loading movement. A pole, a slide ring slidably provided on the loading ring, a loading pole drive arm that rotates by gearing the slide ring, and a pin that is pin-connected to the arm and is driven by the arm. The loading pole drive mechanism is composed of the other loading pole whose loading movement is smaller than that of the other loading pole.

Further, in order to press the two loading poles against the pole guide, two coil springs are provided in the loading ring at positions where they do not interfere with each other.

(Operation) One loading pole is directly driven by the loading ring, and the other loading pole is driven by the slide ring and the loading pole driving arm.

(Example) The Example of this invention is described below based on an accompanying drawing.

FIG. 1 is a plan view of a loading pole drive mechanism according to the present invention. The loading pole drive mechanism 1 includes a loading gear 2 (lower left in the figure) directly or indirectly driven by a motor (not shown) and a thin donut plate. About the outer periphery of
Loading ring 3 with external teeth 3a engraved by 190 °
And a U-shaped slide ring 4 which is connected to the elongated holes 3b formed in the loading ring 3 by pins 3c and has inner teeth 4a formed on the inner peripheral portion thereof, and which meshes with the inner teeth to form a chassis B. A rotatably supported middle gear 5, a left loading pole drive arm 6 meshed with the middle gear 5 and rotatably supported by a shaft 6a on a chassis B, and a pin at one end of the drive arm. Link plate 7 being joined
The left loading pole base 8 pin-connected to the link plate and the upper surface (lower right of the drawing) of the loading ring 3 are slidably locked through the pins 20a, 20a and the elongated holes 20b, 20b. It comprises a loading pole drive plate 20, a link plate 21 pin-connected to one end of this plate, and a right loading pole base 22 pin-connected to this link plate.

In the figure, 9 is a coil spring for urging the slide ring 4 in the counterclockwise rotation direction. The pulling action of this spring causes the pin 3c locked to the slide ring 4 to move to the left end of the elongated hole 3b of the loading ring 3. It's stopped.

Reference numeral 23 is a coil spring that biases the right loading pole drive plate 20 in the leftward rotation direction, and the pulling operation of this spring causes the right loading pole drive plate 20 to move.
Rests on the pins 20a, 20a rising from the loading ring 3 at the left end of the elongated holes 20b, 20b.

In order to supplement FIG. 1, the mounting height of each of the above elements will be described with reference to FIGS.

FIG. 2 is a sectional view taken along the line AA in FIG. 1, in which a loading gear 3 is meshed with a loading ring 3, and a slide ring 4 is connected to the loading ring via an elongated hole 3b and a pin 3c.

FIG. 3 is a sectional view taken along the line BB in FIG. 1, in which the slide ring 4 meshes with the middle gear 5, and the middle gear 5 meshes with the left loading pole drive arm 6.

The loading ring 3 is supported by a bush with a collar, and the positioning in the horizontal direction and the ascending direction is performed by the step portion of the middle gear 5.

FIG. 4 is a perspective view of the Rodins pole drive mechanism. The left loading pole base 8 is pin-connected to the left loading pole drive arm 6 via the link plate 7, and the tilted pole 10 and the left pole are mounted on the left loading pole base 8. Loading pole 11 is standing up.

The left loading pole 11 has a free roller structure in order to reduce wear of the magnetic tape.

Also, on the right loading base 22 that is pin-connected to the right loading pole drive plate 20 via the link plate 21, the inclined pole 24 and the right loading pole are also provided.
25 are standing.

The operation of the loading pole drive mechanism having the above structure will be described below.

5 to 7 are explanatory views of the operation. In FIG. 5, the left and right loading poles 11 and 25 are located on the back surface of the magnetic tape T. The position of each pole at this time is described as P1 and P11. When the loading gear 2 is rotated in the manner described with reference to FIG. 1, the loading ring 3 rotates counterclockwise to drive the right loading pole 25 in the arrow direction.

On the other hand, the middle gear 5 is rotated in the arrow direction by the loading ring 3 and the slide ring 4, and the left loading pole drive arm 6 is swung in the arrow direction.
The left loading pole 11 moves in the arrow direction.

In the left loading pole 11, the left loading pole base 8 moves along the left guide groove B1, and the right loading pole 25 includes the right loading pole base 22 and the right guide rail B3 (in this embodiment, the rail B3 is connected to the pole base 22).
Are engaged. ), They reach the positions P2 and P12 in FIG. 6, respectively.

Furthermore, the movement is continued and the left and right loading poles 1
1,25 stops by hitting the left and right pole guides 12,26 that were waiting. The positions of the left and right loading poles at this time are marked as P3 and P13 (Fig. 7).

In FIG. 7, the loading ring 3 slightly rotates to the left and then stops.

As a result, the coil spring 23 is further stretched, and the right loading pole drive plate 20 is pulled to the left by the pulling amount α of the coil spring 23.
25 is strongly pressed to the pole guide 26.

Similarly, since the coil spring 9 is stretched and the slide ring 4 is pulled in the left rotation direction by the pulling margin β of the coil spring 9, the left loading pole drive arm 6 rotates right and the left loading pole 11 is strongly pushed to the pole guide 12. Be pushed down.

Therefore, left and right loading pole positions P3, P
13 remains stable.

In this embodiment, as is clear from FIG. 7, the moving amount of the left loading pole (P1 → P3) is smaller than the moving amount of the right loading pole (P11 → P13). This is because the movement of the right loading pole depends on the loading ring 3 having a large diameter, whereas that of the left loading pole depends on the small left loading pole drive arm 6.

That is, since the left loading pole arm 6 is provided to the smaller one by making the moving amounts of the left and right loading poles different from each other, the left loading pole drive arm 6 is a so-called rocking arm for a ring. Can be made small.

Further, in the present embodiment, one loading pole is the right loading pole 25 and the other loading pole is the left loading pole 11, but these may be reversed.

(Advantages of the Invention) As described above, the present invention is configured such that the one having the larger loading movement amount is driven by the loading ring and the one having the smaller loading movement amount is driven by the loading pole drive arm. In other words, since the moving amount of the loading pole is made different, the loading pole driving mechanism can be downsized, and the entire device can be downsized. Further, according to the present invention, since a relatively small loading pole driving arm is attached to one loading ring having a thin slide ring, the loading pole driving mechanism is configured.
The height can be reduced compared to the conventional loading ring system, and more gears etc. are provided around the loading ring.
Since they can be arranged arbitrarily, the present invention makes it easier to increase the density of the device as compared with the conventional link system, and thus promotes the compactification of the magnetic recording / reproducing apparatus.

Furthermore, since the coil spring that crimps the loading pole to the pole guide is stored in the loading ring,
The loading pole is kept in a good position, and the coil spring for that purpose does not occupy the space inside the magnetic recording / reproducing apparatus, so that the apparatus can be made compact.

[Brief description of drawings]

1 is a plan view of a loading pole drive mechanism according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 5 to 7 are explanatory views of the operation, FIG. 8 is an explanatory view of the operation of the loading pole, FIG. 9 is a perspective view of a conventional example relating to the loading ring system, and FIG. ),
(B) is a plan view showing a conventional example related to the link system. 1 ... Loading pole drive mechanism, 3 ... Loading ring, 3b ... Long hole, 4 ... Slide ring, 6 ...
(Left) Loading pole drive arm, 9 ... Coil spring, 10b ... Oblong hole, 11 ... Left loading pole (other loading pole), 23 ... Coil spring, 25 ... Right loading pole (one loading pole), B
…… Chassis, T …… Magnetic tape.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-134410 (JP, A) JP-A-60-213056 (JP, A) Actual opening 1-93635 (JP, U) Actual opening 62- 392565 (JP, U)

Claims (2)

[Claims] 1. A pair of loading pole driving mechanisms for pulling out a magnetic tape of a tape cassette and winding the magnetic tape around a head drum, wherein the loading pole driving mechanism is rotatably supported by a chassis and driven by a motor. And one of the loading poles which is pin-connected to the loading ring and which is directly driven by the ring and has a large amount of loading movement, a slide ring slidably provided on the loading ring, and the slide ring. A loading arm driving arm that is gear-connected to rotate, and another loading pole that is pin-connected to this arm and has a smaller loading movement amount than the one loading pole that is driven by this arm. Magnetic recording Raw equipment loading pole drive mechanism. 2. The one loading pole is pin-connected to the loading ring through an elongated hole, and
A coil spring for pressing one loading pole against the pole guide is provided, and the slide link is connected to the loading ring through a long hole, and the other loading pole is provided between the slide ring and the loading ring. 2. The loading pole drive mechanism of the magnetic recording / reproducing apparatus according to claim 1, wherein a coil spring that presses against the pole guide is bridged.