JP2590499Y2 - Cassette mounting mechanism of magnetic recording device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head type magnetic recording / reproducing apparatus such as a DAT, and more particularly to a cassette holding mechanism of a cassette mounting mechanism.

[0002]

2. Description of the Related Art In a conventional cassette mounting mechanism in which a cassette is pulled into a cassette container by a cassette grip, a spring provided on the cassette container for holding down the cassette reduces resistance when the cassette is inserted into the cassette container. It is necessary to reduce the pressing force at that time and increase the pressing force at the reproducing position in order to improve the sitting position at the reproducing position. Therefore, two types of springs having different spring constants have been used.

[0003]

Problems to be Solved by the Invention In the above-mentioned conventional apparatus, when two kinds of springs having different spring constants are provided in the cassette container, there is a problem that the number of parts and the number of assembling steps increase.

[0004] This invention has been made in view of the above points, and its purpose is to use a single type of cassette holding spring, have a low resistance to the insertion of the cassette into the cassette container, and provide a playback position. An object of the present invention is to provide a cassette mounting mechanism of a magnetic recording / reproducing apparatus which presses a cassette against positioning pins with a large pressure.

[0005]

The cassette mounting mechanism of the magnetic recording / reproducing apparatus of the present invention draws the cassette into the cassette container by the horizontally movable cassette grip and lowers the cassette container in which the cassette is inserted to reproduce the cassette. In a cassette mounting mechanism of a rotary magnetic head type magnetic recording / reproducing apparatus which is mounted at a position, a leaf spring having a projection for holding the cassette is fixed to the cassette container in a cantilever state, and a projection close to a tip side of the projection of the leaf spring. When the cassette is retracted into the cassette container, the leaf spring pressing part does not press the leaf spring, and the leaf spring presses the cassette with a small pressing force. When the container descends, the cassette container is Those configured to increase the spring pressure on the cassette pushes the projection adjacent portions of said plate spring by further sinking.

[0006]

According to the cassette mounting mechanism of the magnetic recording / reproducing apparatus of the present invention, the spring for pressing the cassette presses the cassette with a small force when inserting the cassette into the cassette container, but when the cassette container is mounted at the reproduction position, the cassette container does not move. When the sun sinks, the spring is pressed to prevent the spring from deforming, so that the pressing force of the cassette increases.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cassette mounting mechanism of a magnetic recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a container base side plate 2 is fastened to a container base 1 to form a container base that covers both side surfaces and an upper surface of the mechanism. The elevating plate 4 shown in FIGS. 2, 3 and 4 has a U-shaped cross section having a bridge portion at the rear part, and is arranged inside the container base.

[0008] Pins 4a, which are erected on both sides of the lift plate 4,
Are inserted through the guide grooves 1a, 1a of the container base 1 and the guide grooves 2a, 2a of the container base side plate 2, and the elevating plate 4 is supported by the container base so as to be slidable in the front-rear direction.

As shown in FIG. 2, a pin 4c provided on an elevating plate 4 is inserted into a long hole 5a of a lever 5 rotatably supported by a shaft 1c provided on a container base 1. 5 is a cam groove 6 on the lower surface of the cam gear 6.
a. The cam gear 6 is rotatably supported by the container base 1, is rotated by a motor 7 via a gear train, and moves the lifting plate 4 in the front-rear direction via a lever 5.

The cassette container 3 shown in FIGS. 2 and 5
The pins 3a, 3a,... Erected on both sides of the guide groove 1 of the container base 1 as shown in FIGS.
b, 1b and guide grooves 2b, 2b of the container base side plate 2.
The oblique guide grooves 4b, 4b,... Of the lifting plate 4 are inserted, and when the lifting plate 4 moves in the front-back direction, the cassette container 3 moves in the vertical direction.

As shown in FIG. 5, leaf springs 8, 8 are fixed to the left and right upper surfaces of the cassette container 3 by eyelets 8a, 8a,. Projections 8b, 8b are fixed to the front and rear of the leaf spring 8, and the projections 8b, 8b
b, 3b. A projection 8c is formed at the rear end of the leaf spring 8, and the right projection 8c extends below a bulge 3c formed in the cassette container 3.

As shown in FIG. 5 (b), a concave portion is provided at the rear of the side surface of the cassette container 3 so as to allow a light beam for detecting the tape end to pass therethrough.
Are formed.

As shown in FIG. 3, a lid opening / closing plate 9 is rotatably supported on a shaft 1d erected on the container base 1, and a pin 9a erected on the lid opening / closing plate 9 is connected to a lifting plate 4 Faces the cam 4d formed at the end. 1 and 2
The cassette grip mechanism shown in FIG. 6 is slidably held in the guide groove 1e of the container base 1 shown in FIG.

As shown in FIGS. 6 (a) and 6 (b), the cassette grip 10 is
And is urged counterclockwise by a compression coil spring 13. Grip holder 11
A pin 14 is provided upright on the upper surface, and screw holes 11a for mounting are provided before and after the pin 14.

A switch 15 is fastened to the back surface of the grip holder 11, and the operating projection of the switch 15 projects forward from the front surfaces 11 b, 11 b of the grip holder 11.

At the tip of the cassette grip 10, there is formed a claw 10a which protrudes into the grip hole of the cassette, and has slopes 10b on both sides thereof.

As shown in FIG. 3, the collars 16, 16 are inserted into the guide grooves 1e of the container base 1, and
Screws 17, 17 into which grip holder 11 is inserted
The grip holder 11 is slidably supported by being tightened into the screw holes 11a.

As shown in FIG. 1, the cassette feed arm 1
8 is rotatably supported by a shaft 1f erected on the container base 1. The levers 19 and 20 are rotatably supported on shafts 18a and 18b provided on the cassette feed arm 18, respectively. The levers 19 and 20 are biased by a torsion coil spring 21 interposed therebetween, and a stopper 18c provided on the cassette feed arm 18 is provided. , 18d. The long hole 19a provided in the lever 19 has a grip holder 1
The pin 14 erected at 1 is inserted therethrough.

The arm 22 is rotatably supported by a shaft 1g erected on the container base 1. A pin 22a standing on the arm 22 is inserted through a long hole 18e provided on the cassette feed arm 18, and a pin 22b standing on the arm 22 is connected to a cam groove 6 provided on the upper surface of the cam gear 6.
b.

The cam groove 6b on the upper surface of the cam gear and the cam groove 6a on the lower surface have a relationship in which one radius changes at a position where one radius changes, and the grip mechanism and the cassette container are not moved simultaneously. . The switch 23 fixed to the container base 1 is actuated by the projection of the cassette feed arm 18.

In the above configuration, as shown in FIG. 7, before the cassette 30 is inserted into the cassette container 3, the cassette grip 10 is urged by a spring to rotate counterclockwise, and the claw 10a is 3 is located below the upper surface.

When the cassette 30 is pushed, the cassette 3
The slope 30b of the lid 30a of the cassette grip 10
Push up. When the cassette 30 is pushed to the home position,
The claw 10a of the cassette grip 10 protrudes into the grip hole 30c of the cassette 30, and is in the state shown in FIG.

The claw 10a is provided in the grip hole 30 of the cassette 30.
After entering the position c, the switch 15 provided on the grip holder 11 is operated, and the motor 7 rotates in the loading direction. In FIG. 1, the cassette feed arm 18 rotates counterclockwise, the cassette grip 10 is sent rightward, and the cassette 30 is pulled into the cassette container 3. At this time, the overdrive of the cassette feed arm 18 is absorbed by the lever 19 deforming the torsion coil spring 21 and rotating clockwise.

When the cassette 30 moves in the cassette container, the upper surface thereof is pressed by the projection 8b of the leaf spring 8, and there is no play in the vertical direction. Further, the pressure of the leaf spring 8 is small and the sliding resistance is small. If the cassette grip 10 comes off while the cassette 30 is being retracted, the cassette is separated from the switch 15, the release of the cassette grip 10 is detected by the switch 15, and the motor 7 is rotated in the reverse direction.
Even after the cassette 30 is pulled into the cassette container,
The motor 7 further rotates in the loading direction, and the lift plate 4
The cassette container 3 is moved down via.

The lid 30a of the cassette 30 held in the cassette container 3 is rotated upward by the lid opening / closing plate 9 while descending. The cassette 30 is pressed against the positioning pin by the leaf spring 8 at the reproduction position.

At this time, the cassette container 3 is
It sinks further than 0, and the pressing force of the leaf spring 8 is increased by pressing the protruding portion 8c of the leaf spring 8 in the vicinity of the cassette pressure contact portion, so that the cassette can be seated better. When the cassette is ejected, the motor 7 rotates in the unloading direction, and the cassette container 3 and the cassette grip 10 operate in the reverse manner.

When the cassette is pushed out of the cassette container 3 after the cassette container 3 is lifted, the front surface 11b of the grip holder 11 pushes the lid 30a. At this time, a force for deforming the lid 30a acts, but the side surface of the lid 30a is restricted by the projecting portion 3d of the cassette container and does not protrude outside the cassette container 3.

The end of the cassette discharging process is detected by the switch 23 and the motor 7 stops. At this time, the overdrive of the cassette feed arm 18 is absorbed by the lever 20 deforming the torsion coil spring 21 and rotating counterclockwise. At this time, the force of the pin 22a acts on the side surface of the lever 20.

When the motor 7 stops, the cassette 30 and the cassette grip 10 are in the state shown in FIG. 8, and the cassette grip 10 is inserted into the grip hole 30c of the cassette 30. When the cassette 30 is pulled out by hand, the cassette grip 10 moves forward by an amount corresponding to the play of the cam groove 6b, the slope 10b of the cassette grip 10 rides on the slope 1g provided on the container base, and the cassette grip 10 comes off the cassette.

[0030]

According to the cassette mounting mechanism of the magnetic recording / reproducing apparatus of the present invention, the spring for holding the cassette presses the cassette with a small force when inserting the cassette into the cassette container, but when the cassette is mounted at the reproducing position, the cassette is pressed. When the container sinks, the spring portion is pressed to prevent the deformation of the spring, so that the force for pressing the cassette is increased, and the cassette is well seated.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cassette mounting mechanism of a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing the cassette mounting mechanism with some parts removed.

FIG. 3 is a right side view showing the cassette mounting mechanism.

FIG. 4 is a left side view showing the cassette mounting mechanism.

5A is a plan view showing a cassette container of the cassette mounting mechanism, FIG. 5B is a side view showing a cassette container of the cassette mounting mechanism, and FIG. 5C is a cassette mounting mechanism of the same. Front view showing the cassette container of FIG. 5,
FIG. 5D is a sectional view taken along the line AA in FIG.

6A is a plan view showing a cassette gripping mechanism of the cassette mounting mechanism, FIG. 6B is a side view showing a cassette gripping mechanism of the cassette mounting mechanism, and FIG. 6C.
FIG. 4 is a bottom view showing a cassette grip mechanism of the cassette mounting mechanism.

FIG. 7 is a partial sectional view showing a cassette grip mechanism of the cassette mounting mechanism.

FIG. 8 is a partial sectional view showing an operation state of a cassette grip mechanism of the cassette mounting mechanism.

FIG. 9 is a partial sectional view showing an operation state of a cassette grip mechanism of the cassette mounting mechanism.

[Explanation of symbols]

 Reference Signs List 1 container base 2 container base side plate 3 cassette container 4 elevating plate 5 lever 6 cam gear 7 motor 8 leaf spring 9 lid opening / closing plate 10 cassette grip 11 grip holder 12 screw 13 compression coil spring 14 pin 15 switch 16 collar 17 screw 18 cassette feed arm 19, 20 lever 21 torsion coil spring 22 arm 22a, 22b pin 23 switch 30 cassette 30a lid

Continuation of the front page (56) References JP-A-2-7259 (JP, A) JP-A-62-250543 (JP, A) JP-A-2-1722052 (JP, A) Jpn. , U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G11B 15/675 101

Claims (1)

(57) [Scope of request for utility model registration] 1. A cassette mounting mechanism of a rotary magnetic head type magnetic recording / reproducing apparatus which draws a cassette into a cassette container by a horizontally movable cassette grip, lowers the cassette container in which the cassette is inserted, and mounts the cassette at a reproduction position. A leaf spring having a projection for holding the cassette is fixed to the cassette container in a cantilever state, and a leaf spring pressing portion of the cassette container is closely opposed to a portion near a projection on a tip side of the projection of the leaf spring, and the cassette is moved. When retracting into the cassette container, the leaf spring presser does not press the leaf spring, the leaf spring presses the cassette with a small pressing force, and when the cassette container descends, the cassette container sinks further than the cassette. Pressing the protruding portion of the leaf spring near the protrusion A cassette mounting mechanism of a magnetic recording / reproducing apparatus configured to increase a spring pressing force on the cassette.