JP2541211B2 - Cassette mounting device - Google Patents

Description

The present invention relates to a cassette loading device for loading a tape cassette at a predetermined loading position, and more particularly to a cassette loading device suitable for use in a front loading type VTR. .

[Outline of Invention]

According to the present invention, in a motor drive type frant-loading type VTR having a limiter mechanism, a drive wheel provided in a drive mechanism of a cassette holder for loading a tape cassette is provided with an operating portion, and the cassette holder is mounted. When it is moved to the position, the transmission wheel rotates so that its operating portion presses the cassette holder, and this operating portion also serves as the lock of the cassette holder.

[Conventional technology]

Generally, in a VTR, a magnetic tape wound in a cassette casing is pulled out and wound around a head drum to perform recording / reproducing in a helical scan system. Therefore, the tape cassette is mounted by first inserting the tape cassette into the cassette holder and moving the cassette holder to the mounting position. When the tape cassette is loaded, the tape loading is synchronized with this.

[Problems to be solved by the invention]

In such a cassette type VTR, when the cassette holder for mounting the tape cassette is moved to the mounting position, it is necessary to lock the cassette holder at this position. Therefore, conventionally, a dedicated lock mechanism was provided,
The cassette holder is locked at this position. Therefore, there are drawbacks that the number of parts increases, the structure becomes complicated, and the cost becomes high.

The present invention has been made in view of the above problems, and by devising the drive mechanism of the cassette holder, a cassette mounting system that can omit a dedicated lock mechanism for locking the cassette holder is provided. The purpose is to provide a device.

[Means for solving problems]

According to the present invention, a tape cassette is inserted into a cassette holder, and the cassette holder is moved to a mounting position via a worm gear driven by a worm rotated by a motor and a transmission gear transmitting the rotational driving force of the worm gear. The tape cassette is mounted by means of the tape cassette, and when the cassette holder is moved to the movement start position with the insertion of the tape cassette, the worm gear is rotated by the movement of the cassette holder. While the motor rotates through the worm to generate a loss torque, the motor is driven by the detection of the insertion of the tape cassette and the worm gear rotates to move the cassette holder to the mounting position, and the worm gear is provided. The operating part locks the pressed part of the transmission gear. It is obtained so as to press the cassette holder in a mounting position.

[Action]

Therefore, according to the present invention, the impact when the cassette is inserted into the cassette holder is absorbed by the loss torque of the motor. The cassette holder moved to the mounting position by the motor via the worm, the worm gear, and the transmission gear is locked by the actuating portion provided on the worm gear locking the pressed portion of the transmission gear.

〔Example〕

The drawing shows a VTR front loading type cassette loading apparatus according to an embodiment of the present invention. As shown in FIGS. 2 and 3, the cassette loading apparatus is connected by a connecting plate 10. It is provided with a pair of frames 11 and 12. As shown in FIG. 2, three guide grooves 13, 14, 15 are formed in the left frame 12 in an inverted L shape. On the other hand, a pair of upper and lower guide grooves 13 and 15 are formed in the right frame 11. Pins 17 and 18 formed on both side plates of the cassette holder 16 have guide grooves 1
It accepts 3 and 15, which enables the front loading of tape cassettes.

A lock lever 20 is attached to the right frame 11 so as to engage with the step portion 21 of the cassette holder 16. A pressing lever 23 is attached to each of the side plates on both sides of the cassette holder 16, and a pressing rubber 24 is attached to the lever 23. Further, the release ribs 25 for releasing the pressing lever 23 are provided on both sides of the frame 1
It is provided in 1 and 12. A shutter plate 26 is provided at the insertion position of the cassette holder 16 and is opened and closed by an opening / closing lever 27 attached to the side surface of the frame 11. Further, an operating plate 28 is rotatably supported by a side plate on the right side of the cassette holder 16 via a pin 29, and when the tape cassette is mounted, the cassette lid is opened.

Next, the drive mechanism for moving the cassette holder 16 to the mounting position, that is, the processing position will be described.This drive mechanism includes a drive motor 32 and is supported by the right frame 11 via a bracket 33. There is.
A worm 34 is fixed to the output shaft of the motor 32 and meshes with a worm gear 35. A spur gear 36 is integrally formed on the inner side surface of the worm gear 35 as shown in FIG. 1, and is rotatably supported by the frame 11 by a support shaft 37. A segment gear 39 is rotatably supported on another support shaft 38 provided on the frame 11, and the gear 39 meshes with the spur gear 36. Further, the segment gear 39 integrally includes a small segment gear 40.

The small segment gear 40 meshes with the drive gear 43. As shown in FIG. 2, another drive gear 44 is integrally connected to the drive gear 43, and a drive gear 46 provided on the outer surface of the opposite frame 12 via a connecting shaft 45. They are connected (see Fig. 5). The drive gears 44 and 46 mesh with the pressing gear 47 attached to the outer surface of the frames 11 and 12. This gear 47
Are supported by the support shaft 38. Also press gear 47
Is equipped with an arm 48, and as shown in FIGS. 1 and 5,
The opening 49 allows the pin 18 of the cassette holder 16 to be received. Further, the drive gear 47 is a winding spring.
Built in 50.

A switch lever 52 is arranged on the side of the pressing gear 47, and the lever 52 presses the leaf switch that detects the mounting of the cassette. A pressed arm 56 is formed integrally with the segment gear 39, and the pressed arm 56 is pressed by an operating portion 57 formed on the inner side surface of the worm gear 35.

In the above structure, when the tape cassette is inserted into the cassette holder 16 in the raised position so as to push the shutter plate 26 away from the front, the lock lever 20 is pushed up by the cassette lid portion on the tip side of the tape cassette. Then, the engagement with the step portion 21 of the cassette holder 16 is released.
As a result, the cassette holder 16 is unlocked. Then, the cassette holder 16 is moved by the force manually pushed through the tape cassette. At this time, the tape cassette 24 is pressed against the cassette holder 16 by the pressing rubber 24 of the pressing lever 23.

When the cassette holder 16 moves to the right in FIGS. 1 and 4, the pins 18 provided on both sides of the cassette holder 16 also move in the same direction, so that the opening 49 in which the pin 18 is received is opened. The pressing gear 47 which it has will be rotated. The rotation of the gear 47 is generated by gears 44, 46, 43, small segment gear 40, segment gear 39, spur gear 36, worm gear 3
5, Worm 34 is transmitted in that order. Since the worm 34 meshing with the worm gear 35 has three threads and a large advance angle, the worm 34 is rotated by the worm gear 35. Therefore, the motor 32 is rotated at high speed,
The loss torque of the motor 32 causes a buffering operation at the start of insertion of the tape cassette.

When the tape cassette is slightly inserted to the right in FIGS. 1 and 4, the cam formed on the inner surface of the pressing gear 47 pushes the switch lever 52 to rotate it. Then, the lever 52 pushes a leaf switch (not shown), which turns on the switch. Then, the motor 32 is energized, and thereafter, the tape cassette is loaded by the motor 32 and is mounted at the mounting position. That is, the rotation of the motor 32 is
34, the worm gear 35, the spur gear 36, the segment gear 39, the small segment gear 40, and the drive gears 43, 44, 46 to be transmitted to the pressing gear 47. Therefore, the pressing gear 47 is rotated clockwise about the support shaft 38 in FIGS. 1 and 4. Therefore, the opening formed in the arm 48 of this gear 47
The pin 18 engaging with 49 is pushed rightward, and moves along the guide groove 15 of the frames 11 and 12.
Each of the guide grooves 13 to 15 is formed in an inverted L shape, and has a vertical end. Therefore, when the cassette holder 16 is moved rightward by a predetermined stroke, the cassette holder 16 is subsequently lowered and moved to a predetermined mounting position.

As described above, at the final stage of the loading operation for moving the cassette holder 16 to the predetermined mounting position, the spur gear 36 of the worm gear 35 and the segment gear 39 are disengaged. Then, the operating portion 57 formed on the inner surface of the worm gear 35 pushes the pressed arm 56 of the segment gear 39 to rotate the gear 47 clockwise about the support shaft 38. When the tape cassette is completely moved to the mounting position, the winding spring 50 built in the pressure gears 47 on both sides is
Will press the pin 18 of the cassette holder 16, which will elastically press the cassette holder 16.

At this point, the segment gear 39 and the worm gear 35 are rotated as indicated by arrows 58 and 59 in FIG. 1, respectively, and the pressed arm 56 of the segment gear 39 is rotated.
Is pushed by the operating portion 57 of the worm gear 35. That is, the operating portion 57 of the worm gear 35 locks the pressing gear 47, which causes the cassette holder 16
The lock of will be achieved. That is, the relationship between the operating part 57 and the pressed arm 56 is that the pressed arm 56 is the operating part 57.
The positional relationship is such that you cannot turn.

After the tape cassette is mounted in the predetermined mounting position and the recording and / or reproducing operation is performed in this way, the tape cassette is taken out after this. The unloading operation for taking out the tape cassette is performed by rotating the drive mechanism in the opposite direction to the above operation by the motor 32. That is, the motor 32 causes the worm 34, the worm gear 35, the spur gear 36, the segment gear 39, the small segment gear 40, the drive gears 43, 44, 46, and the pressing gear 47 to push the pin 18 by the arm 48 of the gear 47. The cassette holder 16 is moved in the opposite direction along the guide grooves 13-15. The shutter plate 26 is opened via a lever 27 for opening and closing by a cam provided on the drive gear 44.

At the final stage of unloading, the pressing levers 23 provided on both sides of the cassette holder 16 are released by the release ribs 25, and the tape cassette is released from the cassette holder 16. The loading and unloading operations are performed by the connecting shaft.
45 allows the pressing gears 47 on both sides to perform left and right simultaneously, so that smooth cassette mounting and ejection can be achieved.

As described above, according to the cassette mounting apparatus of this embodiment, when the cassette holder 16 is moved to the lowered position, the operating portion 57 of the worm gear 35 shown in FIG.
The pressing gear that presses the pressed arm 56 provided on the 39
It will prevent the rotation of 47. Therefore cassette holder
16 is locked by the operating portion 57 via the pressing gear 47, and a dedicated lock mechanism is not required. Therefore, it is possible to reduce the number of parts and to simplify the mechanism, thereby reducing the cost of the cassette mounting device.

As described above, according to the present invention, when the cassette holder is moved to the movement start position along with the insertion of the tape cassette, the worm gear is rotated by the movement of the cassette holder, so that the motor is rotated through the worm. While generating the loss torque, the motor is driven by the detection of the insertion of the tape cassette to rotate the worm gear to move the cassette holder to the mounting position, and the operating portion provided in the worm gear engages the pressed portion of the transmission gear. The cassette holder is stopped and the cassette holder at the mounting position is pressed.

Therefore, according to the present invention, when the cassette holder is moved to the movement start position along with the insertion of the tape cassette, the worm gear is rotated by the movement of the cassette holder, so that the motor is rotated via the worm that meshes with the worm gear. Then, a loss torque is generated, and the shock when the tape cassette is inserted is absorbed by the loss torque, the insertion operation of the cassette is smoothly performed, and the buffer when the tape cassette is inserted is buffered without providing a dedicated buffer mechanism. Done.

Also, when the tape cassette is inserted, it is detected and the motor is driven, and the rotation of this motor is a worm,
It is transmitted to the cassette holder via the worm gear and the transmission gear, and the cassette holder in which the tape cassette is inserted is moved to the mounting position. Moreover, the cassette holder that has been moved to the mounting position is pressed by locking the operating portion provided on the worm gear or the pressed portion of the transmission gear, which locks the cassette holder at the mounting position. To be achieved. Therefore, the moving mechanism for moving the cassette holder can also serve as the lock, and a dedicated locking mechanism for locking the cassette holder at the mounting position is not required.

[Brief description of drawings]

FIG. 1 is a side view showing a moving mechanism of a cassette holder of a cassette mounting apparatus according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the entire structure, FIG. 3 is a plan view of the same, and FIG. Is a right side view, and FIG. 5 is a left side view. In the reference numerals used in the drawings, 16 ... Cassette holder 18 ... Pin 32 ... Drive motor 34 ... Worm 35 ... Worm gear 36 ... Spur gear 39 ... Segment gear 40 ... Small segment gear 43, 44 , 46 ...... Drive gear 47 ...... Pressing gear 48 ...... Arm 50 ...... Winding spring 56 ...... Pressed arm 57 ...... Working part.

Claims (1)

(57) [Claims] 1. A tape cassette is inserted into a cassette holder, and the cassette holder is moved to a mounting position via a worm gear driven by a worm rotated by a motor and a transmission gear transmitting a rotational driving force of the worm gear. In this device, the tape cassette is mounted by means of which the worm gear is rotated by the movement of the cassette holder when the cassette holder is moved to the movement start position with the insertion of the tape cassette. While the motor is rotated through the worm to generate a loss torque, the motor is driven by the detection of the insertion of the tape cassette and the worm gear is rotated to move the cassette holder to the mounting position, and further, the worm gear is provided. The operating part locks the pressed part of the transmission gear. The cassette holder in a mounting position Te cassette loading device being characterized in that so as to press the.