JPH0471264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tape cassette device for a so-called front-operated video tape recorder in which a tape cassette is inserted from the front.

[Background of the invention]

As is well known, in a cassette-type front-operated video tape recorder, a cassette holder into which a tape cassette (hereinafter simply referred to as a cassette) is inserted from the front is first transported horizontally and then vertically. It is fixed in place and sets the cassette to the loaded state. This transfer of the cassette holder is normally accomplished by transmitting power from a loading motor to the cassette holder via a gear train.

Figures 1a, b, and c are explanatory diagrams showing the cassette loading operation of the cassette loading device in a conventional cassette type front-operated video tape recorder.
is a cassette, 2 is a cassette holder, 2a is a guide pin, 3 is a side bracket, 3a is a guide groove, 4 is a load-in motor, 5 is a worm gear, 6 is a worm wheel, 6a is an opening, 6b is a spring hook, 7 is a spring gear, 7a is a spring hook, 8 is a torsion coil spring, 9 is a drive gear, 9a is a recessed portion, 10 is a drive arm, 10a is a guide groove, 11 is a drive gear shaft, 12 is a starting switch, 12a is a It is a contact piece.

In the figure, a cassette holder 2 is provided between two side brackets 3 (one bracket is not shown). For side bracket 3,
The part extending in the horizontal direction (arrow S direction) (hereinafter referred to as
A guide groove 3a is provided, which consists of a horizontal partial groove) 3a _h and a vertically extending downward portion (hereinafter referred to as a vertical partial groove) 3a _v . 3a, the cassette holder 2 is movably supported by the side bracket 3.

Further, a drive gear 9 is fixed to a rotatable drive gear shaft 11 whose tip portion protrudes from the side bracket 3, and this drive gear 9 is provided with a drive arm 10 having a guide groove 10a on its outer peripheral surface. A guide pin 2a of the cassette holder 2 is also fitted into this guide groove 10a. That is, the guide pin 2a is fitted into the intersection of the guide groove 3a of the side bracket 3 and the guide groove 10a of the drive arm 10. Furthermore, a recess 9a is provided on the outer circumferential portion of the drive gear 9, and a starting switch 12 having a contact piece 12a is provided opposite to this outer circumferential portion.

Furthermore, a worm wheel 6 and a spring gear 7 are coaxially and rotatably provided on the side bracket 3. The worm wheel 6 meshes with a worm gear 5 fixed to the shaft of the loading motor 4, and the spring gear 7 engages with the worm gear 5 fixed to the shaft of the loading motor 4. The hook gear 7 meshes with the drive gear 9. The worm wheel 6 is provided with an opening 6a and a spring hook 6b, and the spring gear 7 is provided with a spring hook 7a so as to protrude from the opening 6a. , 7a, a torsion coil spring 8 is hung between the worm wheel 6 and the spring gear 7.

Next, the cassette mounting operation in this prior art will be explained.

First, the cassette 1 is moved in the direction of arrow S (i.e.
cassette holder 2).
Each member is in the state shown in FIG. 1a until it is fully mounted. That is, the contact piece 1 of the starting switch 12
2a faces the recessed portion 9a of the drive gear 9, the start switch 12 is in the OFF state, the loading motor 4 is in the stopped state, and the small bias of the torsion coil spring 8 causes the spring hook of the spring hook gear 7 to stop. The hook 7a is in contact with one end of the opening 6a of the worm wheel 6.

Cassette 1 is completely placed on cassette holder 2,
When the cassette 1 is further pushed in the direction of the arrow S, the cassette holder 2 moves along the horizontal groove 3a _h of the guide groove 3a, the drive gear 9 moves clockwise, and the spring gear 7 meshed with it moves counterclockwise. Rotate clockwise. However, the loading motor 4 is stopped, and therefore the worm wheel 6 that meshes with the worm gear 5 directly connected to the loading motor 4 does not rotate, resulting in the counterclockwise rotation of the spring gear 7. At the same time, the spring hook 7a moves within the opening 6a of the worm wheel 6, and the torsion coil spring 8 is expanded and twisted.

Then, as shown in FIG. 1B, when the contact piece 12a of the starting switch 12 comes into contact with the outer peripheral portion of the drive gear 9, the starting switch 12 is turned on and the loading motor 4 rotates. Therefore, the power of the loading motor 4 is transmitted to the worm wheel 6 via the worm gear 5, and the worm wheel 6 rotates counterclockwise to untwist the torsion coil spring 8. The rotation of the worm wheel 6 is further transmitted to the drive gear 9 via the torsion coil spring 8 and the spring gear 7. In this manner, the cassette holder 2 is moved in the direction of arrow _S along the horizontal partial groove 3ah by the power of the loading motor 4.

When the loading motor 4 continues to rotate and the guide pin 2a reaches the end of the horizontal partial groove 3a _h , next,
As shown in FIG. 1c, the cassette holder 2 descends along the vertical partial groove _3av . When the guide pin 2a reaches the lower end of the vertical partial groove _3av , the loading motor 4 stops, the cassette holder 2 is fixed, and the loading of the cassette 1 is completed.

When ejecting the cassette 1, the cassette holder 2 is released from the fixed state, the loading motor 4 rotates in the opposite direction to that in the above case, and the worm wheel 6 rotates clockwise. When the spring gear 7, drive gear 9, and cassette holder 2 are started, the torsion coil spring 8 is expanded and twisted by this rotation, and the spring gear 7 is rotated clockwise and driven by this bias. The gear 9 rotates counterclockwise and the cassette holder 2 rises along the vertical partial groove _3av .

When the guide pin 2a of the cassette holder 2 reaches the upper end of the vertical partial groove 3a _v , the cassette holder 2
moves in the direction opposite to the arrow S along the horizontal partial groove 3a _h . Then, after passing through the state shown in FIG. Stop. At this time, the guide pin 2a of the cassette holder 2 is in the position shown in FIG. There is.

By the way, in such a conventional cassette mounting device, when the cassette holder 2 is moving along the vertical partial groove _3av in FIG. P acts, which causes the following problems.

That is, now the drive gear shaft 11 and the guide pin 2
Let P' be the component of the force P in the direction perpendicular to the line connecting A, L1 be the distance between the center of the spring gear 7 and the spring hook 7a, and let _L1 be the distance between the center of the spring gear 7 and the spring hook 7a, and
When the guide pin 2a is in the vertical partial groove _{3a v} , the force F'=L ₁ /L ₂ ·P' acts on the torsion coil spring 8, and this force F ′, the torsion coil spring 8 is expanded and twisted. For this purpose, a force is exerted on the torsion coil spring 8 when the guide pin 2a moves from the horizontal partial groove 3a _h to the vertical partial groove 3a _v , and vice versa when it moves from the vertical partial groove 3a _v to the horizontal partial groove 3a _h .
A sudden load change corresponding to F′ will occur.

When the torsion coil spring 8 is weak, the amount of extension, that is, the amount of twist, increases in response to this load variation, and when the guide pin 2a is moving in the vertical partial groove _3av , the cassette holder 2 is moved from its original position. is also below. For this reason, when the cassette 1 is installed, at the turning point where the guide pin 2a moves from the horizontal partial groove _3ah to the vertical partial groove _3av , the cassette holder 2 drops down momentarily, and the injector of the cassette 1 When the guide pin 2a is in the vertical partial groove 3a _v
At the turning point when moving from the horizontal groove 3a h to the horizontal groove 3a _h , the torsion coil spring 8 becomes untwisted and the cassette holder 2 suddenly moves forward rapidly, causing damage to the cassette 1. There was a drawback that smooth transfer was not possible.

In order to eliminate this drawback, it is conceivable to use a strong spring member that can withstand sudden load changes as the torsion coil spring 8, but if this is done, the cassette 1 will not be pushed in until the start switch 11 is turned on. This requires a large amount of force, which impairs the operational feel.

[Purpose of the invention]

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned prior art,
To provide a cassette mounting device capable of pushing a cassette mounted on a cassette holder with a small force when mounting a cassette, and achieving smooth cassette transfer operation.

[Summary of the invention]

To achieve this object, the present invention provides a power transmission system consisting of a plurality of gears that transmits the power of a motor to a cassette holder, and in which a clutch member is attached to the gear on the motor side of two gears connected by a spring member. The clutch member allows the spring member to absorb the amount of horizontal movement of the cassette holder caused by pushing the cassette when the motor is stopped, and when the cassette holder is vertically moved by the motor. , is characterized in that the spring member is prevented from expanding due to the weight of the cassette and the cassette holder.

[Embodiments of the invention]

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

FIG. 2 is a plan view showing an embodiment of the cassette mounting device according to the present invention, in which 2b is a guide pin;
3 is a guide plate, 14 is a connecting plate, 15 is a door, 15
a is the door shaft, 16 is the motor bracket, 17 is the synchronous gear, 18 is the synchronous shaft, 19 is the tension coil spring,
20 is a link, 21 is a mounting pin, 22 is a guide member, 23 is a printed wiring board, and 24 is a connector, and parts corresponding to those in FIG. 1 are given the same reference numerals. It should be noted that each member on one side bracket 3 side is distinguished from the parts on the other side bracket 3' side by attaching a dot.

In Figure 2, two side brackets 3,
3' is connected and fixed by a guide plate 13 on the cassette insertion opening side A and by a connecting plate 14 on the back side B, forming a gate-shaped structure. These side brackets 3, 3' each have 3
Two guide grooves are provided, and guide pins provided on both sides of the cassette holder 2 are fitted into the respective guide grooves, whereby the cassette holder 2 is movably supported between the two side brackets 3. ing. In addition, in FIG. 2, only two guide pins 2a, 2b, 2a', and 2b' on both sides of the cassette holder 2 are shown.

A loading motor 4 is attached to the side bracket 3 on the right side when viewed from the cassette insertion opening side A, and a worm gear 5, a worm wheel 6, and a spring gear are installed between the motor bracket 16 and the side bracket 3. 7, a power transmission system for the motor 4 consisting of a synchronizing gear 17 and a driving gear 9 is provided, and a side bracket 3' on the opposite side is provided.
A power transmission system consisting of a synchronous gear 17' and a drive gear 9' is provided on the side.
17' are fixed to the same synchronous shaft 18, and these two
Two power transmission systems are connected. The drive gear 9 is provided with a tension coil spring 19 and a drive arm 10. A link 20 is rotatably attached to the tip of the drive arm 10 by a mounting pin 21. The guide pin 2a fits into the provided through hole, and the link 20 is rotatably attached to the guide pin 2a. This structure is the same for the side bracket 3' side.

Door shafts 15a, 15a' are fixed to the ends of the side brackets 3, 3' on the side A of the cassette insertion port, and the door 15 is attached so as to be openable and closable by these door shafts 15a, 15a'. Further, a printed wiring board 23 on which a drive circuit is formed is attached to the loading motor 4, and the loading motor 4 and a connector 24 are connected by this printed wiring board 23.

Furthermore, a guide member 22 is provided within the motor bracket 16, and a clutch member (not shown), which will be described later, is provided on the worm wheel 6, and as the worm wheel 6 rotates,
This clutch member is guided by a guide member 22 to perform a predetermined movement.

FIG. 3 is a side view of the side bracket 3 in FIG. 2, in which 3b is a guide groove and 10b is a protrusion. 4 is a sectional view showing the power transmission system on the side bracket 3 side of FIG. 2, in which 9b is a cam groove, 9c is an arm locking portion, and 10c is
is a bush, 10d is a spring hook, 16a is an arm shaft, 16b is a wheel shaft, 25 is a clutch member,
26 is a bearing part, 27, 28 are switches, 29, 3
0 is a switch arm, and 30a is an arm.
Note that in FIGS. 3 and 4, parts corresponding to those in FIG. 2 are given the same reference numerals.

3 and 4, the motor bracket 16 includes an arm shaft 16a and a wheel shaft 16b.
A drive gear shaft 11 is also mounted on the side bracket 3 coaxially with the wheel shaft 16b. Further, the side bracket 5 is provided with a bearing portion 26, by which the synchronizing shaft 18 is rotatably supported.

A worm wheel 6 and a spring gear 7 are rotatably attached to the wheel shaft 16b. It is connected to a provided spring hook 7a by a torsion coil spring 8 hung between the two. Further, the worm wheel 6 meshes with a worm gear 5 directly connected to the loading motor 4. The synchronous gear 17 is a two-stage gear fixed to the synchronous shaft 18, and its large diameter portion meshes with the spring gear 7, and its small diameter portion meshes with the drive gear 9.

A bush 10c mounted on the drive arm 10 is rotatably supported on the drive gear shaft 11, and a drive gear 9 is rotatably attached to the bush 10c. Motor bracket 16 of drive gear 9
A cam groove 9b is provided on the side surface, and an arm locking portion 9 is provided on the surface on the side bracket 3 side.
c, and as shown in FIG. 8, a spring hook 9d,
A tension coil spring 19 is provided between the spring hook 9d and a spring hook 10d provided on the drive arm 10.
is suspended, and the drive gear 9 and the drive arm 10 are connected by this tension coil spring 19.
This tension coil spring 19 is a strong spring member, and its urging force presses the drive arm 10 against the arm locking portion 9c. Normally, the drive gear 9 and the drive arm 10 rotate together. do.

Switch arms 29, 3 are attached to the arm shaft 16a.
0 is rotatably attached, and is rotated by a cam groove provided in the drive gear 9 as the drive gear 9 rotates. These rotations cause switch 2
7 and 28 are controlled to be turned on and off, respectively. The switch arm 30 is provided with an arm arm 30a, which is arranged so that it can be pressed by a protrusion 10b provided on the drive arm 10.

Further, a clutch member 25 is provided on the surface of the worm wheel 6 on the motor bracket 16 side.
As the worm wheel 6 rotates, the guide member 2
2 and performs the operation described below.

Next, the operation of this embodiment will be explained with reference to FIGS. 5 to 8.

FIGS. 5a and 5b show the cassette holder 2 in the cassette ejection position with the guide pins 2a and 2b in contact with the ends of the horizontal partial grooves of the guide grooves 3a and 3b. At this time, the pins provided at the ends of each of the switch arms 29 and 30 are in the position shown in the cam groove 9b provided in the drive gear 9, and
As shown in Figure a, the switch arm 30 turns the switch 28 on, and as shown in Figure 5b, the switch arm 29 turns the switch 27 off.

In FIGS. 5a and 5b, 3c is a guide, 31 and 32 are tension coil springs, and the switch arms 30 and 29 are biased counterclockwise by the tension coil springs 31 and 32, respectively.

Therefore, when the cassette 1 is inserted from the cassette insertion slot, the door 15 is rotated counterclockwise about the door shaft 15a and lifted, and the cassette 1 is further pushed in the direction of arrow S and mounted on the cassette holder 2. be done. During this time, all members are at rest.

When the cassette 1 is further pushed in, the cassette holder 2 is also pushed at the same time, and the guide pins 2a and 2b move along the guide grooves 3a and 3b, respectively. Along with this, the link 20 also includes the guide pin 2a and the mounting pin 2.
The drive arm 10 moves while rotating about 1.
rotates clockwise about the drive gear shaft 11.

On the other hand, as explained earlier, the drive arm 10
is an arm locking portion 9c provided on the drive gear 9 by a tension coil spring 19 (FIGS. 4 and 8).
(FIGS. 4 and 8), the drive gear 9 is pushed by the drive arm 10 and rotates clockwise (ie, in the direction of arrow c). Along with this, a synchronous gear 17 meshed with the drive gear 9, and a spring gear 7 meshed with this synchronous gear 17.
(Fig. 4) also rotates. However, the loading motor 4 is stopped, and therefore the worm wheel 6 (FIG. 4) that meshes with the worm gear 5 directly connected to the loading motor 4 does not rotate, resulting in the movement of the cassette holder 2. is the extension (i.e., torsion) of the torsion coil spring 8 suspended between the worm wheel 6 and the spring gear 7.
absorbed by.

Furthermore, as the drive gear 9 rotates, the cam groove 9
b also rotates, and the switch arms 29 and 30 also rotate about the arm shaft 16a.

Then, as shown in FIG. 6a, when the cassette 1 is pushed in enough, the cam groove 9b of the drive gear 9
As a result, the switch arms 29 and 30 are rotated, and the switch 28 is turned off, and the state shown in FIG.
As shown in FIG. 2, the switch 27 is turned on and the loading motor 4 begins to rotate.

Therefore, in FIG. 4, the worm wheel 6
begins to rotate, first, the torsion coil spring 8 is untwisted, and then the opening 6a of the worm wheel 6 is opened.
comes into contact with the spring hook 7a of the spring gear 7, and the spring gear 7 is pushed by the worm wheel 6 and rotates. This operation is similar to that of the prior art shown in FIG.

As a result, in Fig. 6a and b, the synchronous gear 1
7 rotates, and the drive gear 9 rotates clockwise (i.e.
(direction of arrow C). Then, the tension coil spring 19 (FIG. 8) suspended between the drive gear 9 and the drive arm 10 causes the drive arm 10 to also rotate clockwise, and the cassette holder 2 moves into the guide groove 3.
move along a and 3b.

In this way, the cassette holder 2 is moved by the power of the loading motor 4, and the guide groove 3
horizontal movement along a and 3b, and then vertical movement.

When the cassette holder 2 changes from horizontal movement to vertical movement, the guide pin 2c fits into the guide guide 3c.

When the cassette holder 2 reaches the lowest point, the switch arm 29 is rotated by the cam groove 9b of the drive gear 9, as shown in FIGS. 7a and 7b.
7 is turned off, and the loading motor 4 stops.

In this case, the time when the switch 27 is turned off by the switch arm 29 is slightly delayed from the time when the cassette holder 2 reaches its lowest point. Further, as shown in FIG. 8, when the cassette holder 2 reaches the lowest point, the protrusion 10 of the drive arm 10
b comes into contact with the arm arm 30a. As a result, even if the cassette holder 2 reaches its lowest point and the protruding portion 10b of the drive arm 10 comes into contact with the arm arm 30a, the drive gear 9 will further rotate slightly by an angle θ and then stop. For this purpose, the spring hook 1 of the drive arm 10
Even if 0d is stopped, the spring hook 9d of the drive gear 9 rotates, and the tension coil spring 19 is expanded. As a result, a biasing force is generated in the tension coil spring 19, and the protrusion 10b of the drive arm 10 is pressed against the arm arm 30a, so that the cassette holder 2 is stably held at the lowest point.

When ejecting, the operation is the opposite of the above.

That is, when the eject button on the operating section is pressed, the loading motor 4 rotates, and the drive gear 9 rotates counterclockwise (in the direction of arrow D) from the states shown in FIGS. 7a and 7b. For this purpose, the drive arm 10 is pushed by the arm locking portion 10d of the drive gear 9 and rotates counterclockwise, and the cassette holder 2 is rotated in the guide grooves 3a, 3b.
vertically and then horizontally along. When the cassette holder 2 passes through the position shown in FIG. 6a and reaches the cassette ejection position shown in FIG. 5, the loading motor 4 is stopped by turning on the switch 28 as the switch arm 30 rotates.

In the above operation, the torsion coil spring 8 suspended between the worm wheel 6 and the spring gear 7 shown in FIG. 4 is moved by the clutch member 25 until it reaches the state shown in FIG. is expanded, but is not expanded in other states.

This point will be explained below with reference to FIGS. 9 and 10, which show the operation of the clutch section 25. In addition, in FIGS. 9 and 10, 6c
6d is a locking portion, 6d is a clutch shaft, and 22a is a guide groove. Portions corresponding to those in FIG. 4 are given the same reference numerals. In FIG. 9a, a clutch shaft 6d is mounted on the worm wheel 6, and a clutch member 25 is rotatably attached to the clutch shaft 6d. Further, the worm wheel 6 is also provided with a locking portion 6c, which allows the clutch member 2 to
I'm trying to make sure that 5 doesn't come off. Clutch member 2
5 is formed with a hook-shaped stopper 25a, and is also provided with a boss 25b.

On the other hand, a guide member 22 is provided on the motor bracket 16 opposite to the surface of the worm wheel 6 on which the clutch member 25 is provided (FIG. 2). As shown in FIG. 10a, this guide member 22 has a guide groove 22a, into which the boss 25b of the clutch member 9 (FIG. 9a) is fitted. The guide groove 22a consists of two arcuate portions formed concentrically with different radii of the guide member 22, and an inclined portion connecting these two arcuate portions.

First, when the cassette holder 2 is in the cassette ejection position shown in FIG. 5a, the clutch member 25 is in the position shown in FIGS. 9a and 10a.

That is, the boss 25b of the clutch member 25 is
The clutch member 25 is located at the end of the outer circumferential arc-shaped portion of the guide groove 22a of the guide member 22, so that the clutch member 25 is rotated counterclockwise and is in a tight state. At this time, the spring hook 7 of the spring gear 7
a is in contact with one end of the opening 6a of the worm wheel 6, and the torsion coil spring 8 is in a released state (that is, in a contracted state without being twisted).
Further, since the clutch member 25 is in the above state, it is not engaged with the spring hook 7a.

Next, when cassette 1 is inserted and pushed in, as explained in FIGS. 5 and 6, cassette 1 is mounted on cassette holder 2 and pushed in, causing cassette holder 2 to move in the horizontal direction. However, at the same time, the spring gear 7 rotates in the direction of arrow E. At this time, since the worm wheel 6 is stopped, the torsion coil spring 8 is expanded and twisted as the spring hook 7a rotates in the direction of the arrow E. In this way, the state when the cassette holder 2 reaches the position shown in FIG.
Shown in Figure b. In this case, the clutch member 25 is
The boss 25 of the clutch member 25 is in a state similar to that shown in FIG.
The positional relationship of b is shown in FIG. 10a.

The loading motor 4 is started in the state shown in FIG. When 7a comes into contact with the original end of the opening 6a of the worm wheel 6, the spring hook 7a is pushed by the worm wheel 6, and the spring gear 7 rotates together with the worm wheel 6. The positional relationship between the spring hook 7a and the clutch member 25 at this time is the same as that shown in FIG. 9a.

As the worm wheel 6 rotates, the boss 25b of the clutch member 25 moves along the guide groove 22a of the guide member 22. Then, while the cassette holder 2 (FIG. 6a) is being horizontally transferred, the boss 25b of the clutch member 25 passes through the connection part of the guide groove 22a of the guide member 22, and the boss 25b of the clutch member 25 passes through the connecting part of the guide groove 22a of the guide member 22, and the outer arc-shaped part Then move to the arc-shaped part on the inner circumferential side. That is, in FIGS. 11a and 11b, when the guide pin 2a of the cassette holder 2 is at the position P of the horizontal groove 3a _h of the guide groove 3a, the boss 25b is located at the circular arc-shaped portion on the outer peripheral side of the connection part of the guide groove 22a. When the guide pin 2a is located at the position Q, the boss 25b is located at the end of the arcuate portion on the inner peripheral side of the connecting portion.

In this way, the boss 25b of the clutch member 25
However, as the guide groove 22a of the guide member 22 moves from the outer circumferential arc portion to the inner circumferential arc portion, the clutch member 25 rotates clockwise about the clutch shaft 6d, and the stopper 25a moves toward the spring gear 7.
It engages with the spring hook 7a.

Thereafter, the cassette holder 2 is moved horizontally and then vertically while maintaining this state.
At the turning point when the cassette holder 2 moves from horizontal to vertical transfer, the load applied to the torsion coil spring 8 changes due to the weight of the cassette 1 and the cassette holder 2, and the torsion coil spring 8 tries to expand.
Since the stopper 25a of the crack member 25 is engaged with the spring hook 7a, the torsion coil spring 8
cannot be stretched and remains untwisted. This state is shown in FIG. 9c, and the positional relationship of the boss 25b of the clutch member 25 with respect to the guide groove 22b of the guide member 22 in this state is shown in FIG. 10b.

When ejecting the cassette, the clutch member 2
2 naturally performs the opposite operation to the above.

In this way, in this embodiment, when the cassette holder 2 is being transported horizontally, the clutch member 2 is moved against the spring hook 7a of the spring gear 7.
5 is engaged and disengaged, and the torsionoid spring 8 is prevented from expanding when the cassette holder 2 is vertically transferred. That is, the torsion coil spring 8 is expanded only during the cassette pushing period until the loading motor 4 starts when the cassette is installed.
It will not grow in other periods. For this reason, even if the torsion coil spring 8 is used as a spring member with the minimum necessary force, it is possible to prevent the instantaneous sudden movement of the cassette holder 2 at the transition point between horizontal transfer and vertical transfer. Even when the torsion coil spring 8 is disengaged from the spring hook 7a, the cassette holder 2 does not move suddenly because the torsion coil spring 8 is in an unstretched state.
Therefore, the movement of the cassette holder 2 is carried out smoothly, and the pushing force of the cassette 1 can be reduced, improving operability.

〔Effect of the invention〕

As explained above, according to the present invention, the spring member that is provided between the two gears of the power transmission system of the motor and that absorbs the amount of movement of the cassette holder when pushing the cassette is made of a spring member with the minimum necessary force. can be used to realize smooth transfer of the cassette holder, thereby reducing the pushing force of the cassette, improving operability, and eliminating the drawbacks of the above-mentioned conventional technology. A cassette mounting device with excellent functionality can be provided.

[Brief explanation of the drawing]

Figures 1a, b, and c are explanatory diagrams of the operation of a conventional cassette loading device, Figure 2 is a plan view showing an embodiment of the cassette loading device according to the present invention, Figure 3 is a side view thereof, and Figure 4 is a A sectional view showing the power transmission system, No. 5
8 to 8 are explanatory diagrams of the operation thereof, FIGS. 9 and 10 are explanatory diagrams of the operation of the clutch member of FIG. 2,
FIGS. 11a and 11b are explanatory diagrams showing the operation of the clutch member as the cassette holder of FIG. 2 is transferred. 1...cassette, 2...cassette holder, 4...
...Loading motor, 6...Worm wheel, 6a...Opening, 6b...Spring hook, 6
d...Clutch shaft, 7...Spring gear, 7a...
Spring hook, 8...Torsion coil spring, 9...Drive gear, 10...Drive arm, 22...Guide member, 22a...Guide groove, 25...Clutch member, 25a...Stopper, 25b...Boss.

Claims (1)

[Claims] 1. In a cassette mounting device that transmits the power of a motor to a cassette holder via a power transmission system consisting of a plurality of gear trains, and horizontally and vertically transports the cassette holder on which a tape cassette is mounted, the power transmission system a spring member that connects the two gears; and a clutch member that operates with the rotation of the motor-side gear of the two gears, and the clutch member controls the cassette holder when the motor is stopped. By releasing the spring member and making it expandable during horizontal transfer, the spring member absorbs the amount of horizontal transfer of the cassette holder when the motor is stopped, and when the cassette holder is transferred by the motor, , a cassette mounting characterized in that the spring member is engaged with the spring member to prevent the spring member from elongating, thereby preventing the spring member from elongating when the cassette holder is vertically transferred. Device.