KR850001422Y1 - Moving apparatus for video disk player arm assembly - Google Patents

Abstract

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Description

Electronic reversing device of ARM ASSEMBLY in VDP (VIDEO DISK PLAYER)

1 is a schematic diagram of a main portion of a conventional VDP, which extracts only the structure related to the forward and backward motion of the female assembly.

2 is a schematic diagram of main parts of the VDP of the present invention.

3 is an electronic circuit diagram for automatic reversal of a press assembly in a VDP of the present invention.

4 is a state diagram to illustrate the switching relationship of the micro switch.

* Explanation of symbols for main parts of the drawings

A: Cartridge (CATRIDGE) case (1 ')

A female assembly with a cartridge arm (1) and an actuator (2)

B: Motor (3) Reduction Gear: (4)

Reverse Clutch: (5) Pinion Gear: (5)

Spring: 11

It is the forward and backward assembly of the deceleration and female assembly combined with worms (40)

7: handle lever and linked lever

60: rack gear formed on the bottom right of the operating part

C: 3-step handle

Ma: Turntable driving motor switch

Mb: Female assembly motor drive switch

Mc: Female Assembly Reverse Drive Motor Switch

Md: Female Assembly Stop Switch

The present invention relates to a device for reproducing video and sound using a disc recording medium, that is, a loading device of a video disc player (hereinafter referred to as VDP), wherein a VDP is loaded / unloaded to play a disc solid or upside down. The present invention relates to an electronic reversing device that automatically reverses the female assembly so that the disk can be easily reclaimed.

In the related art, if the VDP is brought into the loaded / unloaded state to replace the disc as required by the user while the play operation is performed, the disc and the turntable are lowered, and the female assembly is in the position where the play is stopped. In this state, when the caddy (disc storage slot) is pushed in, one end of the caddy is caught by one end of the female assembly, and the caddy pushes the female assembly to return the female assembly to the playback start position, and then stores the disk. That is, in the related art, such a series of operations are to force the female assembly to return to the starting position by human force, and the operation is quite difficult, and the caddy that pushes one end of the female assembly is frequently damaged. Damaged debris could be left as dust inside the device, which could impede the operation of the device requiring precision.

On the other hand, since the female assembly is advanced by the power of the motor during regeneration and the forced retreat by human power when the disk is replaced, there is no disadvantage that a relatively complex power transmission device is required to accommodate different power sources during the forward and backward movement.

In more detail, in the conventional VDP, the rotational force of the motor rotating at high speed is decelerated through the worm and the dignity gear, and the reduced rotational force is finally transmitted to the pinion gear, and the pinion gear is placed on the bottom of the operating part of the female assembly. Engage with the formed rack gear to advance the female assembly at an extremely low speed.

However, when the female assembly is retracted, the rack gear must reverse the pinion gear to reverse the various gears connected thereto in turn, which is not only structurally impossible but also easily damages the precise gear device. In VDP, the structure is required to revolve only the pit gear gear engaged with the rack gear when the female assembly is retracted. Accordingly, the clutch device for transmitting power is also required when the female assembly is advanced. It had a complicated structure.

Therefore, such a conventional structure is disadvantageous in terms of workability and price, and it is not easy to accurately perform the advance operation of the female assembly, which affects the image quality.

The present invention aims to solve this problem. In the conventional VDP, a complicated structure for backward assembly of the female assembly (A) is eliminated, and two micro switches (Mc, Md) are additionally installed in the existing micro switches (Ma, Mb). The drive stage I ₁ and the OP amplifier OP ₁ are symmetrically connected to a circuit for rotating the motor 3 forward with the existing drive stage I ₂ and the OP amplifier OP ₂ , and OP The switching transistor (Q ₁ ) is connected to the non-inverting terminal (+) of the amplifier (OP ₁ ), and the micro switch (Mc, Md) additionally installed therein is connected to the electronically automatic backward configuration. When the action knob (C) is placed in the "loaded / unloaded" state, the female assembly is automatically retracted to provide a convenient disk replacement device that eliminates the conventional forced reversal of the female assembly, and the female assembly and the female assembly driving motor Only to gears Gihayeo standing right arm assembly drive because key groups and the improvement of quality, by implementing a complex structure with a simple device haryeoneunde promote the improvement of production efficiency and cost reduction will have its purpose.

This will be described in detail with reference to FIG. 2, the female assembly driving motor 3 and the gear 4 engaged with the motor to obtain a deceleration force, the worm 40 formed on the shaft of the gear 4, A worm gear (not shown hidden by the worm) that meshes with the worm 40 to obtain a further reduced rotational force, a pinion gear (6) installed on the axis of the worm gear, and an arm assembly to be engaged with the pinion gear (6). The rack assembly 60 is installed on the bottom of the operating part 2 of A), and the female assembly A driving device is configured.

On the other hand, such a device is a link 7 connected to a three-stage handle C (hereinafter referred to as an operating lever) in FIG. 1, which is a conventional embodiment, a spring 11 that is regulated by the link 7, It is the same as the structure which excluded the clutch 5 for idling the pinion gear 6 at the time of reverse rotation of the female assembly A. FIG. In addition, the female assembly reverse rotation drive motor switch Mc (hereinafter referred to as reverse rotation switch) is installed to be opened and closed by the switch pressing plate Mc 'installed on the shaft of the operation lever C. This switch Mc is configured to be pressed during " playback " and to be returned to its original state during " load / unload ".

On the other hand, a female assembly stop switch (Md) (hereinafter referred to as a stop switch), which regulates further reverse rotation when the female assembly (A) is reversed, is installed at the rear of the VDP set, and the female assembly (A) is It is installed to be pressed when it is fully retracted.

In the following description, as shown in FIG. 4, when the reverse rotation switch Mc and the stop switch Md are pressed, it is OFF, and when it is in an original state, it is ON.

Referring to FIG. 3, the non-inverting terminal (+) of the first operational amplifier OP ₁ includes the female assembly reverse drive power supply V _R and the second operational amplifier OP ₂ . The female assembly forward driving power supply (V _F ) is applied to the non-inverting terminal, the inverting terminal (-) is grounded through a diode, and the output of each operational amplifier OP ₁ (OP ₂ ) is a motor drive circuit having a known configuration. I ₁ ) (I ₂ ) are respectively connected, and the motor 3 is rotated forward or reversely by the potential difference of the motor drive circuit I ₁ (I ₂ ).

Further, the arm assembly backward driving power source (V _R) of the resistance (R ₁₎ and by the resistance partial pressure is applied to the collector base of the switching transistor (Q ₁₎ for the switching transistor (Q ₁₎ for, the reverse switch (Mc) And the stop switch Md in turn and supply the switching power B therebetween, and the stop switch Md is grounded when it is turned on (if it is in its original state). The female assembly forward drive power supply V _F is supplied only during regeneration through the female assembly forward drive motor switch Mb, and has a higher potential difference than the reverse drive power supply V _R.

The turntable driving motor switch Ma is to supply power only during regeneration, and Ma'Md 'is a switch pressing piece that regulates the opening and closing of the switch Ma (Mb) and is installed on the axis of the operating lever (C). .

Referring to the operation of the present invention configured as described above, since the female assembly (A) is reproducing the disk surface during regeneration, the stop switch (Md) is not pressed, the "ON" state and the reverse rotation switch (Mc) is operating the lever (C) is because the reproduction state switch pushing piece (Mc ') is pressed, "OFF" and the status by the base is not whereby the power applied to the switching transistor (Q ₁₎ for the switching transistor (Q ₁₎ for the Is blocked.

Accordingly, the female assembly reverse driving power supply V _F is applied to the non-inverting terminal of the first operational amplifier OP ₁ , but the female assembly forward driving power supply is also applied to the non-inverting terminal + of the second operational amplifier OP ₂ . Since V _F ) is applied and the relationship of V _F > V _R , the female assembly driving motor 3 rotates forward at low speed and the female assembly A plays at low speed along the disc surface.

After the play is completed, the disc needs to be replaced or flipped to bring the operating lever (C) to the "load / unload" state, and the vertex of the switch pressing piece (Mc ') installed on the operating lever (C) axis drops and rotates backward. The switch Mc is turned "ON", and the stop switch Md remains ON, so the base of the switching transistor Q ₁ is grounded, and the switching transistor Q ₁ is also kept in the disconnected state. do. However, in the "load / unload" state, since the female assembly forward driving power supply V _F is not applied, only the reverse power supply V _R is applied to the female assembly driving motor, thereby rotating the motor 3 in reverse.

When the motor 3 rotates in reverse, the direction of rotation of the motor 3 is reverse to that of the forward rotation, so that the reverse rotation speed of the motor 3 passes through the reduction gear 4 to the pinion gear 6. It is transmitted to the rack gear 60 formed on the lower right side of the operating portion (2) of the female assembly (A), and the gear is engaged to rotate so that the female assembly (A) placed in the center of gravity is retracted to its original position. . Thus, when the female assembly A completes the reverse operation, the stop switch Md provided at the rear end of the female assembly A is pressed to turn "OFF", and the switching power supply B is connected to the switching transistor Q ₁ . It is applied to the base to conduct the switching transistor Q ₁ .

Therefore, the collector potential of the switching transistor Q ₁ becomes the stop potential, and the motor 3 is stopped because no power is applied to the non-inverting terminal + of the first operational amplifier OP ₁ .

In other words, the female assembly A remains in the reversed position and prepares for a reproducing operation after replacing the disc. In this state, the female assembly repeats the above reproducing operation.

The present invention is very convenient by simply reversing the reverse motion of the female assembly electronically, and in particular, it eliminates all the complicated structures for the conventional reverse motion and the limited motion, thus making the production simple and greatly reducing the cost. It is a very beneficial feature.

Claims (1)

In VDP, the switch pressing piece Mc 'and the micro switch Mc driven by the three-step knob C are placed on the same drive shaft as the conventional micro switches Ma and Mb and the pressing pieces Ma' and Mb '. After the constant speed arrangement, the micro switch Md is additionally installed in the predetermined part of the rear end of the operating part 2 of the female assembly A, and the motor is connected to the existing drive end I ₂ and the OP lamp OP ₂ . The drive terminal I1 and the OP amplifier OP ₁ are symmetrically connected to the circuit for forward rotation, and the switching transistor Q ₁ is connected to the non-inverting terminal (+) of the OP amplifier OP ₁ . And the micro switch (Mc, Md) in series on the base of the electronic assembly of the female assembly in the VDP, characterized in that serially constant.