JP3039014B2 - Cassette mounting 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 front loading type cassette mounting apparatus in a cassette type magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, a cassette loading device of a cassette tape recording / reproducing device such as a video tape recorder is mainly of a front loading type in which a cassette is loaded from the front. Hereinafter, an example of the above-described cassette mounting device will be described with reference to the drawings.

FIG. 6 shows a configuration of a conventional cassette mounting apparatus. In FIG. 6, 1 is a cassette holder,
2, 2 'are side walls integrally formed on both sides of the cassette holder 1, 3, 3' are guide pins provided on the side walls 2, 2 ', and 4, 4' are side plates arranged on both sides of the cassette holder 1. , 5, 5 'are L-shaped guide grooves provided in the side plates 4, 4', each having two or three guide grooves, and the guide pins 3, 3 'engaging respectively.
The guide pins 3, 3 'are provided corresponding to the number of the guide grooves 5, 5'.

Drive arms 6 and 6 'are connected by a shaft 7 and are rotatably supported by side plates 4 and 4'. The main guide pins 3, 3 'on the members 2, 2' are respectively engaged. A shaft 7 is provided on one of the drive arms 6 or 6 '.
And the gears are integrally formed concentrically.

Reference numeral 9 denotes a first rack having a guide groove formed so as to be able to move horizontally by fitting into two guide pieces 10, 10 'provided on the side plate 4 or 4', and one end thereof. Has several first teeth 12 meshing with a gear 11 integral with the drive arm 6, and at the other end engages an actuator 14 of a slide switch 13 fixed to the side plate 4 or 4 '. This constitutes a bent projection. Reference numeral 15 denotes a second rack, which has guide grooves so as to be fitted to guide pieces 10 and 10 'provided on the side plate 4 or 4' and movable horizontally, similarly to the first rack 9.
The second rack 15 and the first rack 9 are connected to each other by an elastic member 16 such as a high initial tension tension spring engaged with a spring hook portion provided on each of them. Also, one end of the second rack 15 is in phase with the teeth provided on the first rack 9, but has several second teeth 17 having a small number of teeth, and has an L-shape. The other bent end has third teeth 18 formed at the same length as the first teeth formed on the first rack 9 at a position where the gears 11 are not meshed with the drive arm 6.

Reference numeral 19 denotes an output gear provided on the main body of the magnetic recording / reproducing apparatus. When the conventional cassette mounting apparatus is mounted on this main body, the second gear 17 of the second rack 15 is adjusted in advance in phase. Is to be meshed with. still,
The second rack 15 has a second engaging portion 20 such as a square long hole.
A first engaging portion 21 formed by a bent portion or the like formed on the first rack 9 is fitted into the first rack 9, and the side plate is normally in a position where the first engaging portion 21 abuts on each other by the elastic member 16. The phase of the guide grooves fitted into the guide pieces 10, 10 'formed on the fourth rack 4 or 4' is reached, and the second rack 1
The first rack 9 and the second rack 15 are configured to be able to slide relative to each other only in the space between the five square holes 20 and the bending members 21 of the first rack 9. Reference numeral 35 denotes a top plate connecting the side plates 4 and 4 '.

FIG. 7 is a block diagram showing an example of a drive system for a magnetic recording / reproducing apparatus in a conventional example.

In this case, a case is shown in which all operations except for the cylinder are performed only by the capstan motor.

In FIG. 7, 22 is a direct drive capstan motor, 23 is a first speed reduction system, 24 is a second speed reduction system, 25 is a reel base, 26 is a first clutch, and 27 is a kind of clutch function. A third reduction system having
28 is a fourth deceleration system, 29 is an output system for performing a tape loading operation, 30 is a second clutch, 31 is a fifth deceleration system, 32 is an output system of a system for controlling the operation mode of each mechanism, and 33 is an output system. A sixth reduction system 19 is an output gear connected to the cassette mounting device.

The first clutch switches between cassette mounting, tape loading, and other operations and tape running operation. A first speed reduction system and a second speed reduction system are provided in a block diagram. Although not shown, there is a mechanism for connecting or cutting off the rotation of the capstan motor in conjunction with the mechanical operation mode control system, so that it is connected when the tape runs.

FIG. 8 to FIG. 11 are explanatory diagrams of the operation of the cassette mounting device configured as described above.

FIG. 8 shows a state before the cassette is inserted. Here, the position of the actuator 14 of the slide switch engaged with the first rack 9 is automatically determined, and no adjustment is required.

FIG. 9 shows a state in which the cassette is stored in the cassette holder, the cassette holder is pushed in, the cassette-in switch operates, and the rotation of the drive motor starts.

That is, while the second rack 15 meshed with the output gear 19 is in the original state, the first rack 9 meshed with the gear 11 integral with the drive arm 6 is a tension spring 16
Move horizontally against

If the cassette holder 1 containing the cassette is pushed in while the power is off, the cassette corresponds to the space between the square hole 20 of the second rack 15 and the bending member 21 of the first rack 9. It can be pushed in a distance that is less than the horizontal movement section of the holder.

FIG. 10 shows a state in which the cassette-in switch operates to perform a cassette mounting operation. The output gear 19 rotates, and the second rack 15 meshing with the output gear 19 moves horizontally in the direction of arrow a.
, The drive arm 6 meshing with the first rack 9 is rotated in the direction of arrow b, and is engaged with the drive arm 6 by the guide pin 3. The cassette holder 1 moves horizontally and vertically along L-shaped guide grooves 5, 5 'formed in the side plates 4, 4'.

FIG. 11 shows a state where the cassette has been mounted in a predetermined position. At this time, the second teeth 17 formed at one end of the second rack 15 and having the same phase as the first teeth 12 provided on the first rack 9 mesh with the gear 11 integrated with the drive arm 6. I have.

In the operation of ejecting the cassette, each of the above-described components moves in the opposite direction to that in the mounting operation, but the vertical operation section is the second tooth 1 on the second rack 15.
7 is set so as to mesh with the gear 11 of the drive arm 6, similarly to the first teeth 12 of the first rack 9. However, the cassette holder 1 corresponding to the space region between the square hole 20 of the second rack 15 and the bent portion 21 of the first rack 9
Is set so that the second teeth 17 on the second rack 15 do not mesh with the gear 11 of the drive arm 6 in the horizontal operation area of FIG.

[0019]

However, as described above, the clutch mechanism of the conventional cassette mounting apparatus has a configuration in which the pushing stroke of the cassette tape is limited. There is a problem that an overload is applied to a gear unit provided on a drive arm for driving the cassette holder, the clutch mechanism unit, and a slide unit connected thereto, and a part of the drive system is damaged.

[0020]

According to the present invention, there is provided a cassette holding member for accommodating a cassette tape having a plurality of projections formed on side walls provided on both sides, and a cassette holding member disposed on both sides of the cassette holding member. A side plate having a plurality of L-shaped guide grooves engaged with the projections; a side plate rotatably supported by the side plate;
A shaft on which a drive arm having a slidable guide groove is fixed, and a shaft is formed on one side of the drive arm, and a gear is formed on the shaft and a moving core. First in the area where it can be rotated by a certain angle
And a first rack that forms a first engaging portion and partially forms a first engaging portion and is horizontally movable along a guide member provided on one side of the side plate. First
And a drive arm that is movable along a guide member so as to be slidable with each other by being connected to the first rack by an elastic member, and a drive arm. A cassette mounting device including a second rack having second teeth over substantially the same length as a region of the first teeth formed on the first rack at a position where the second gear does not mesh with the gear provided on the first rack. In addition, the driving arm is provided with a locking portion that can be brought into contact with the abutting portion provided on the second rack, and the turning force generated by rotating the driving arm is rotated through the locking portion to generate the second power. The second rack is configured to be able to act on the contact portion in a direction perpendicular or substantially perpendicular to the horizontal movement direction of the rack, and when the locking portion and the contact portion are in a position where they can contact, the first The configuration of the engaging portion and the second engaging portion allows the relationship between the first rack and the second rack to be changed by the elastic member. It has a movable become configuration so as to increase the force.

[0021]

With this configuration, even if the cassette is pushed in when the cassette is inserted, the drive system can be prevented from being damaged due to overload.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a cassette mounting apparatus according to an embodiment of the present invention. In FIG. 1, parts having the same numbers as in the conventional example have the same names and the same configurations. Therefore, detailed description here is omitted.

In the figure, reference numeral 36 denotes a drive arm 6 and a gear 11
The locking portion integrally formed with the first rack 37 is a first rack,
Two guide pieces 10, 1 provided on the side plate 4 or 4 '
It has a guide groove formed so as to be able to move horizontally by being fitted to 0 ', and at one end thereof has several first teeth 12 which mesh with a gear 11 integrated with the drive arm 6, and The other end is formed with a bent projection which engages with the actuator 14 of the slide switch 13 fixed to the side plate 4 or 4 '.

Reference numeral 38 denotes a second rack, and the first rack 37
Guide pieces 10 provided on the side plate 4 or 4 ',
The second rack 38 and the first rack 37 are provided with a guide groove so as to be able to be horizontally moved by fitting into the 10 ', and the second rack 38 and the first rack 37 are provided with a high initial tension tension spring or the like engaged with a spring hooking portion provided respectively. They are interconnected by an elastic member 16. or,
One end of the second rack 37 is in phase with the teeth provided on the first rack 38, but has several second teeth 17 having a small number of teeth, and is bent in an L-shape. At the other end, a third tooth 18 formed over the same length as the area of the first tooth formed on the first rack 37 is provided at a position where it does not mesh with the gear 11 integrated with the drive arm 6. Also, the second rack 38
Is formed with a second engaging portion 39 such as a rectangular long hole having an engaging surface 40 and a non-engaging surface 41. The second engaging portion 39 is formed by a bent portion formed on the first rack 37. First engagement portion 21
Are fitted, and in the position where they are normally in contact with each other by the elastic member 16, the phase of the guide groove fitted to the guide pieces 10, 10 'formed on the side plate 4 or 4' is reached, The square hole 39 of the second rack 38 and the first rack 37
Of the first rack 37 only in the space region with the bending member 21 of FIG.
And the second rack 38 are configured to be slidable with respect to each other.

Reference numeral 42 denotes a contact portion including a contact surface 43 formed integrally with the second rack. The contact surface 43 is disposed in a positional relationship that allows the contact surface 43 to contact the locking portion 36. or,
The contact surface 43 is provided between the first rack 37 and the second rack 3.
The plane is parallel or substantially parallel to the direction of movement of the drive arm 8, and its height is set at the center or almost the center of the shaft 7 of the drive arm 6.

The drive system according to one embodiment of the present invention
Since it is the same as FIG. 7 of the conventional example, the description is omitted here.

FIGS. 2 to 5 are explanatory views of the operation of the cassette mounting apparatus constructed as described above. FIG. 2 is a schematic side view of a main part showing a state before the cassette is inserted. In this state, the distance in which the cassette holder 1 can move horizontally is defined as l _1, and the first engagement portion 21 provided on the first rack 37 is
Assuming that the distance to the non-engaging surface 41 of the second engaging portion 39 of the rack is l ₂ , l ₁ and l ₂ are set in the following relationship.

L ₂ · K> l ₁ K: ratio of movement of the cassette holder 1 to movement of the first rack 37 In other words, no matter what state the cassette holder 1 is moved horizontally, the first engaging portion 21 2 engagement part 39
The non-engagement surfaces 41 are set so as not to engage with each other.

The rotatable angle of the drive arm 6 when the second rack 38 is not moving is θ. θ
Even if it is attempted to rotate as described above, it becomes impossible for the contact surface 43 of the contact portion 42 to contact with the locking portion to rotate.

Therefore, if the cassette holder 1 containing the cassette is pushed in while the power is off, the cassette holder 1 can be pushed by a distance corresponding to the rotation angle θ of the drive arm 6.

FIG. 3 shows a state in which the cassette is accommodated in the cassette holder, the cassette holder is further pushed in, the cassette-in switch operates, and the drive motor starts rotating. Reference numeral 44 denotes a front panel fixed to the main body. The dimensions of the front panel 44 and the rear of the cassette
₃ and when, is set in the relationship of l _3> 0 when θ = 0.

Now, when θ in FIG. 2 is θ ≧ 0, that is, the second rack 38 meshing with the output gear 19 is in the original state, but meshes with the gear 11 integrated with the drive arm 6. The first rack 37 moves horizontally against the tension spring 16.

FIG. 4 shows a state in which the cassette-in switch operates to perform a cassette mounting operation. The output gear 19 rotates,
The second rack 38 meshing with the output gear 19 moves horizontally in the direction of arrow a. However, since the wall of the square hole 20 pushes the bending member 21 of the first rack 9, the second rack 38 meshes with the first rack 37. The driving arm 6 is rotated in the direction of the arrow b, and the cassette holder 1 engaged with the driving arm 6 by the guide pin 3 has an L-shape formed on the side plates 4, 4 '. Horizontally and vertically along the guide grooves 5, 5 '.

FIG. 5 shows a state in which the cassette has been mounted at a predetermined position. At this time, the second teeth 17 formed at one end of the second rack 38 and having the same phase as the first teeth 12 provided on the first rack 37 mesh with the gear 11 integrated with the drive arm 6. I have.

In the operation of ejecting the cassette, the above-described components move in the opposite direction to that in the mounting operation, but the vertical operation section is the second tooth 1 on the second rack 38.
7 is set so as to mesh with the gear 11 of the drive arm 6, similarly to the first teeth 12 of the first rack 37. However, the square holes 39 of the second rack 38 and the first rack 37
The second teeth 17 on the second rack 38 are set so as not to mesh with the gear 11 of the drive arm 6 in the horizontal operation area of the cassette holder 1 corresponding to the space area with the bent portion 21 of FIG. .

Next, the case where the cassette is pushed in when the cassette is inserted will be described with reference to FIGS.

When the cassette is instantaneously and impactfully inserted from the state shown in FIG. 2, the cassette holder 1 moves to a displacement amount corresponding to θ of the drive arm 6, and the state shown in FIG.
It becomes 0. Accordingly, the excessive pushing force F is applied to the locking portion 36.
Through the contact surface 43 of the contact portion 42 of the second rack 38. The contact surface 43 is provided between the first rack 37 and the second
The height is set at the center or substantially the center of the axis 7 of the drive arm 6.

Therefore, the excessive pushing force F is generated only in the direction of arrow c. That is, the arrow d is displayed on the second rack 38.
No directional force acts.

In this state, the first engaging portion 21 of the first rack 37 and the second engaging portion 3 of the second rack 38
9 is not in contact with the non-engagement surface 41, and only the tension of the elastic member 16 acts on the gear 11 provided on the drive arm 6, so that an excessive force does not act. Therefore,
An excessive force does not act on any gear portion of the drive system for moving the cassette holder 1 due to the impact.

In the state shown in FIG. 4, even if the cassette is pushed in, the relation between l ₁ and l ₂ is set to l ₂ · K <l ₁ , so that an excessive force is generated in the second rack 38. do not do.

[0042]

As described above, according to the present invention, even when the cassette is pushed in when the cassette is inserted, the drive system can be prevented from being damaged without overloading any gear for driving the cassette holder. Is obtained with a very inexpensive and simple configuration. Further, since the pushing stroke is limited in the initial state of insertion, an extremely excellent effect of improving the operational feeling of the user can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cassette mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a main part for explaining the operation of the embodiment.

FIG. 3 is a schematic side view of a main part for explaining the operation of the embodiment.

FIG. 4 is a schematic side view of a main part for explaining the operation of the embodiment.

FIG. 5 is a schematic side view of a main part for explaining the operation of the embodiment.

FIG. 6 is a perspective view showing a configuration of a conventional cassette mounting apparatus.

FIG. 7 is a block diagram showing an example of a drive system of a general magnetic recording / reproducing apparatus.

FIG. 8 is a schematic side view of a main part for explaining the operation of a conventional cassette mounting apparatus.

FIG. 9 is a schematic side view of a main part for explaining the operation of the conventional example.

FIG. 10 is a schematic side view of a main part for explaining the operation of the conventional example.

FIG. 11 is a schematic side view of a main part for explaining the operation of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cassette holder 2 Side wall 2 'Side wall 3 Guide pin 3' Guide pin 4 Side plate 4 'Side plate 5 L-shaped guide groove 5' L-shaped guide groove 6 Drive arm 6 'Drive arm 7 Axis 8 Guide groove 8 ′ Guide groove 11 Gear 12 First tooth 16 Elastic member 17 Second tooth 21 First engaging portion 36 Locking portion 37 First rack 38 Second rack 39 Second engaging portion 42 Contact portion 43 Abutment surface

Claims (2)

(57) [Claims] 1. A cassette holding member for accommodating a cassette tape having a plurality of projections formed on side walls provided on both sides, and a plurality of L-shaped members arranged on both sides of the cassette holding member and engaged with the projections. A side plate having a shape guide groove, and a drive arm rotatably supported by the side plate and having a guide groove slidably engaged with one of the protrusions on both sides. A fixed shaft, a gear is formed concentrically with the shaft on one side of the drive arm, and a first tooth is formed in a region that meshes with the gear to rotate the drive arm at least a fixed angle, and A first rack partly forming a first engaging portion and being horizontally movable along a guide member provided on one of the side plates; and a first engaging member provided on the first rack. The mating portion engages with the engaging surface and A second engaging portion having a non-engaging surface, the second engaging portion being connected to the first rack by an elastic member, and being movable along the guide member so as to be slidable with each other; A second rack having third teeth formed over substantially the same length as a region of the first teeth formed on the first rack at a position meshing with the output gear without meshing with the gear provided on the arm; The drive arm is provided with a locking portion that can be brought into contact with a contact portion provided on the second rack, and a rotation generated by rotating the drive arm. Power is configured to be able to act on the contact portion in a direction perpendicular or substantially perpendicular to the horizontal movement direction of the second rack via the lock portion, and the power is applied to the lock portion and the contact portion. when the contact portion is in contact with, the first engaging portion and the second engagement portion non of The mating face cassette loading apparatus characterized by a non-contact state. 2. When the engaging portion abuts on the abutting portion, the rear surface is located inside the front panel constituting the deck body with respect to the insertion direction of the cassette inserted into the cassette holder. The cassette mounting device according to claim 1, wherein