JPH0778940B2 - Cassette loading device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cassette mounting device used in a video tape recorder.

(Prior Art) A conventional cassette mounting device will be described with reference to FIGS. 6 to 10.

FIG. 6 is a side view of a conventional cassette mounting device. The cassette mounting device has a positioning pin at the mounting position of the cassette 1.
2a and a height determining pin 2b are provided, and a base 2 having a recording / reproducing functional component (not shown) and a support shaft 3a of a support 3 fixed to the rear of the base 2 and the left side in the figure are rotatable. It is composed of a cassette holder 4 which is axially supported and which accommodates the cassette 1.

The cassette holder 4 has a rear end bent into a bell crank shape and a hook hole 4a formed at the front end thereof, and an extended tension coil between the cassette holder 4 and the hook pin 2c planted in the middle of the side surface of the base 2. The spring 5 constantly urges it in the counterclockwise direction indicated by arrow A. Further, the cassette holder 4 thus biased is regulated by the stopper pin 3b planted in the support base 3 and stopped at the insertion position having an inclination of about 30 °. Further, the cassette holder 4 has a stopper 4b for determining the position of the inserted cassette 1.
Then, a pressing leaf spring 4d for pressing the cassette 1 against the bottom surface 4c as shown by an arrow B is formed. A front panel 6 of the video tape recorder is drawn in front of the base 2.

The operation of the cassette mounting device thus configured will be described.

First, the cassette 1 is inserted into the cassette holder 4 as shown by arrow C until it abuts on the stopper 4b. Since the pressing leaf spring 4d is bent in the cassette 1, the cassette 1 comes into close contact with the bottom surface 4c due to its elastic repulsive force. Next, cassette holder 4
When is pushed down in the direction of arrow A, while rotating against the biasing force of the tension coil spring 5, the support shaft 3a is rotated clockwise as shown by arrow D, and as shown in FIG. The positioning pin 2a and the height determining pin 2b serve to mount the base 2 at a fixed position.

The cassette holder 4 is fixed in the state shown in FIG. 7 by a locking device (not shown), and the tape guard panel 1a that covers the front surface (left side in the drawing) of the cassette 1 is shown.
Is opened by an opener (not shown) attached to the base to expose a magnetic tape (not shown).

In order to take out the cassette 1, if the locking device is released, the cassette returns to the taking-out position shown in FIG.

(Problems to be Solved by the Invention) However, in the above configuration, since the cassette holder 4 rotates, the cassette 1 is mounted in a fixed position on the base 2 while drawing an arc. This situation will be described with reference to an enlarged cross-sectional view of the main part of FIG. 8. Between the guide post 7 and the guide roller 8 arranged on the base 2, the magnetic tape 9 exposed so as to extend in front of the cassette 1 comes. To be installed. Since the cassette 1 housed in the cassette holder 4 (not shown) rotates about the support shaft 3a as shown by the arrow E, the loci of the inner wall 1b of the cassette 1 and the magnetic tape 9 are respectively the support shaft 3a. Arcs m and n centered at.

Therefore, the gap between the inner wall 1b and the guide post 7 indicated by the dimension line Δx ₁ becomes the dimension line Δx ₂ during the mounting process, and the dimension line Δx ₃
The gap between the magnetic tape 9 and the guide roller 8 indicated by is similarly reduced to the dimension line Δx ₄ in the process of mounting. Therefore, there has been a problem that the clearance margin for avoiding the interference with the functional component is extremely small. As a countermeasure against this, there is also a problem that the size becomes large if the position of the support shaft 3a is separated and the arc is enlarged.

Further, as shown in FIG. 9, when the cassette holder 4 is pushed down while the cassette 1 does not reach the stopper 4b of the cassette holder 4 in an insufficiently inserted state, the cassette 1 rotates clockwise as indicated by an arrow D and then moves forward. It will stop by hitting the upper edge of the panel 6. At that time, there is also a problem that the magnetic tape 9 which is exposed when the tape guard panel 1a is opened comes into contact with the upper end surface of the guide post 7 and is bent and damaged.

The present invention solves the above problem and provides a cassette mounting apparatus in which a cassette is moved and mounted substantially vertically while maintaining a horizontal position.

(Means for Solving the Problems) In order to solve the above problems, according to the present invention, a tip of a rotating arm rotatably supported by a support shaft provided in front of a base is provided for a cassette holder. A cam follower for interlocking the support shaft and an auxiliary holder newly provided inside the support shaft is arranged, and in the center portion of the cassette holder axially supported by the support shaft, the above new auxiliary holder is similarly provided. A cam follower for interlocking with the above is provided, and further, the above two cam followers are fitted to the above-mentioned auxiliary holder which is rotatably supported by the support shaft at the rear of the base, and the above-mentioned rotating arms and Two guide grooves are provided so as to move the cassette holder in conjunction with each other and keep the cassette holder in a horizontal posture.

(Operation) With the above structure, the support shaft at the rear of the cassette holder descends with the rotation of the auxiliary holder, and at the same time, the front of the cassette holder moves at approximately the same speed as the support shaft by the action of the cam follower fitted in the guide groove. As it descends, it moves in the vertical direction indicated by arrow H in FIG. 8 and in the vertical direction indicated by arrow K in FIG. 10 while maintaining a horizontal posture.

Therefore, the gaps Δx ₁ and Δx ₃ shown in FIG. 8 can be effectively used as they are. Further, when the insertion into the cassette holder is insufficient, the cassette 1 only hits the tip of the front panel 6 as shown in FIG. 10, and the magnetic tape 9 does not hit the guide post 7.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

1 and 2 are side views of the cassette mounting device according to the present invention. The same components as those of the conventional example shown in FIG. 6 are designated by the same reference numerals.

In FIG. 1, the base 2 has the same positioning pins as the conventional example.
2a, height determining pin 2b, hook pin 2c, and rear support 3 as well as an opener 2d for opening the tape guard panel 1a of the cassette 1, not shown in FIG. 6, and the above-mentioned positioning pin 2a and height. A lock pin 2e of the locking device is provided between the deciding pins 2b, and a support base 10 is newly provided at the front.

An auxiliary holder 11 is pivotally supported on the support shaft 3a of the rear support base 3 and a hook hole 11a formed at a bell crank-shaped tip thereof, and a hook pin 2 planted on the side surface of the base 2.
It is constantly urged in the counterclockwise direction indicated by arrow A by a tension coil spring 5 extended between c and c, and is restricted by a stopper 3c formed on the support base 3 to stay at an insertion standby position of about 30 °. . In addition, the bearing hole 10 formed in the front support 10
A support shaft 12a, which is planted at the end of the rotating arm 12, is fitted in a, and rotatably supports the rotating arm 12. The cassette holder 4 is attached to the support shaft 12b planted at the tip of the rotating arm 12.
Is rotatably supported, and a cam roller 13 which is a cam follower for interlocking with the above-mentioned auxiliary holder 11 is mounted inside thereof. A cam roller 14, which is a cam follower for interlocking with the auxiliary holder 11, is attached to the cassette holder 4 at approximately the center thereof, and the same stopper 4b as the conventional example and the conventional pressing leaf spring 4d are replaced. A pressing pad 4d is provided.

Further, on the side surface of the auxiliary holder 11, a guide groove 11b in the longitudinal direction in which the cam roller 13 of the rotating arm 12 is fitted.
And a guide groove 11c which is fitted to the cam roller 14 of the cassette holder 4 and whose rear portion is bent upward is formed.

The lock lever 15 that engages with the lock pin 2e of the base 2 described above.
Is rotatably attached to the support shaft 11d planted in the auxiliary holder 11 and has a hook hole 15 formed at the end thereof.
The tension coil spring 16 is stretched between a and a hook hole (not shown) of the pull-out protrusion 11e formed in the auxiliary holder 11 to urge it in the counterclockwise direction. Is regulated by the stopper pin 11f planted in
It is configured to form a right angle with the auxiliary holder 11. An engaging hook-shaped portion 15c having a guide surface 15b is formed at the tip of the lock lever 15.

Moving to FIG. 2, a crimping plate 17 is rotatably supported by a support shaft 4e planted in a bracket formed on the upper surface of the cassette holder 4, and is rotatably supported by an urging device (not shown). It is biased in the counterclockwise direction and comes into contact with the ceiling surface 11g of the auxiliary holder 11 with a contact pressure, and presses the cassette holder 4 in the clockwise direction.

The operation of the cassette mounting device thus configured will be described.

In FIG. 1, since the cassette loading device is in a standby state in which the cassette 1 can be inserted, first, with the tape guard panel 1a in front, the cassette 1 from the direction indicated by the arrow C,
Insert it in the cassette holder 4 and push it in until it stops at the stopper 4b as shown in FIG. Next, in FIG.
When the upper surface of the auxiliary holder 11 is pushed down as shown by the arrow P, the auxiliary holder 11 pushes the tension coil spring 5 and
The rotation arm 12 and the cassette holder 4 are rotated clockwise about the support shaft 3a as shown by an arrow D, and through two cam rollers 13 and 14 fitted into the two guide grooves 11b and 11c. Push down. The rotating arm 12 rotates counterclockwise around the bearing hole 10a as shown by an arrow L, and lowers the height of the support shaft 12a planted at the tip thereof. On the other hand, the cassette holder 4 is a support shaft whose height gradually decreases toward the rear.
12a, the front of which is formed in the auxiliary holder 11,
Since the cassette holder 4 is supported by the cam rollers 14 fitted in the downwardly convex arc-shaped guide grooves 11c, respectively, the cassette holder 4 maintains a horizontal posture while forming an arc p centered on the bearing hole 10a in the drawing. Descend along.

The arc p is an arc n centered on the support shaft 3a shown in FIG.
Since it can be set to be larger than that of, the reduction amount of the gap between the inner wall 1b of the cassette 1 and the magnetic tape 9 and the recording / reproducing functional components such as the guide post 7 and the guide roller 8 is significantly reduced.

As the auxiliary holder 11 rotates clockwise as shown by arrow D,
After the state shown in FIG. 3, the mounted state shown in FIG. 4 is obtained. Since the two guide grooves 11b and 11c of the auxiliary holder 11 are both formed so that the width at the rear end is wide, the cam rollers 13 and 14 are released from the guide grooves 11b and 11c at the time of mounting. The pressure holding plate 17 of the auxiliary holder 11 and the pressing pad 4d of the cassette holder 4 are responsible for maintaining the attitude of the cassette 1.

In FIG. 5, as the auxiliary holder 11 rotates, the lock lever 15 pivotally supported by the auxiliary holder 11 also descends while drawing an arc, and the guide surface 15b formed at the tip of the auxiliary holder 11 locks the lock pin 2 of the base 2.
In the state in which the cassette 1 is positioned on the positioning pin 2a and the height determining pin 2b while riding on the e and rotating clockwise while extending the tension coil spring 16, the engaging hook-shaped portion 15c
Engages with the lock pin 2e and is fixed at the mounting position. In this state, as described above, the cassette 1 is closely fixed to the shoulder surface of the positioning pin 2a and the tip surface of the height determining pin 2b by the action of the pressure plate 17 and the pressing pad 4d. The tape gart panel 1a of the cassette 1 is opened by the opener 2d of the base 2 in the process of rotating. Recording and reproduction are performed in this state.

The procedure for taking out the cassette 1 is to rotate the tip of the lock lever 15 in the clockwise direction so that the engaging hook-shaped portion 15c and the lock pin 2e.
If the engagement of is released, the elastic force of the tension coil spring 5
It rotates in the counterclockwise direction shown by arrow A in FIG. 1, and returns to the standby state shown in FIG. 2 through the procedure opposite to the above-mentioned mounting, so that the cassette 1 can be taken out from the cassette holder 4. .

As described above, since the cassette 1 descends substantially vertically while keeping the horizontal posture along the large arc, the reduction of the gap between the guide post 7 and the guide roll 8 is small, and the cassette 1 is not inserted. If insufficient, the main body of the cassette 1 comes into contact with the front panel 6 and stops, as shown in FIG. 10, so that the magnetic tape 9 does not come into contact with the guide roll 8 and is therefore not damaged.

(Effects of the Invention) As described above, according to the present invention, since the cassette vertically moves up and down along a large arc while maintaining a horizontal posture, a gap that avoids interference with a recording / reproducing functional component is provided. In addition, since the magnetic tape is not likely to come into contact with the above functional parts even when the cassette is not sufficiently inserted, a cassette mounting device that is easy to handle and has high reliability can be obtained.

[Brief description of drawings]

1 and 2 are side views of the cassette mounting apparatus according to the present invention, FIGS. 3 and 4 are side views for explaining the operation thereof, and FIG. 5 is a side view of the cassette mounting apparatus when mounted.
FIG. 6 is a side view of a conventional cassette mounting apparatus, FIG. 7 is a side view of the conventional cassette mounting apparatus, FIG. 8 is an enlarged cross-sectional view of an essential part thereof, and FIGS. 9 and 10 show insufficient insertion of the cassette. It is a principal part side view for demonstrating operation | movement of a state. 1 ... Cassette, 1a ... Tape guard panel, 1b ... Inner wall, 2 ... Base, 2a ... Positioning pin, 2b ... Height determining pin, 2c ... Hook pin, 2d ... Opener, 2e ... Lock pin, 3,10 ... Support base, 3a, 4e, 11d, 12a, 12b ... Support shaft, 3b, 11f ... Stopper pin, 3c, 4b ... Stopper, 4
...... Cassette holder, 4a, 11a, 15a …… Hook hole, 4c ……
Bottom, 4d …… Pressing leaf spring, 4e …… Pressing pad, 5,16…
... tension coil spring, 6 ... front panel, 7 ... guide post, 8 ... guide roller, 9 ... magnetic tape, 10a ...
Bearing hole, 11 ... Auxiliary holder, 11b, 11c ... Guide groove, 11e ...
… Drawing protrusion, 12 …… Rotating arm, 13,14 …… Cam roller, 15 …… Lock lever, 15b …… Guide surface, 15c …… Engagement hook-shaped part, 17 …… Crimping plate.

Claims (1)

[Claims] 1. A cassette mounting apparatus for transporting and mounting a cassette to a mounting position by utilizing a pivoting movement around a supporting shaft provided at the rear of a base, the supporting shaft being provided at the front of the base. For rotatably rotatably supported on the front end of the cassette holder for accommodating the cassette, and the auxiliary holder rotatably rotatably supported around the rear support shaft. Rotating arms each having a cam follower attached thereto, a cassette holder rotatably supported by a supporting shaft of the above-mentioned rotating arm, and a cam follower attached to the center portion thereof for interlocking with the above-mentioned auxiliary holder, Cassette mounting, characterized in that the auxiliary holder has two guide grooves that are fitted to two cam followers to transmit a rotational movement and keep the cassette holder in a substantially horizontal position during the rotation. Dress .