KR100218906B1 - Optical disc player - Google Patents

Abstract

The present invention relates to an optical disc player of the present invention, in particular, a main deck in which a forward and reverse drive motor is mounted at a predetermined position, a cam gear mounted in the main deck and forward and reverse rotation by driving the drive motor, and a lower side thereof. A plurality of tray gears which selectively engage in predetermined sections of the cam gears and are engaged with rack gears whose upper sides are opposed to the bottom of the trays, and which load / unload the trays to the deck when the cam gears are driven; And a chucking device coupled to the main deck so as to be slidably movable on the main deck to chuck the optical disc seated on the tentable from the tray when the cam gear is driven.

Description

Optical disc player

The present invention relates to an optical disc player, and more particularly, to a turntable using a driving force transmitted from a front-rear driving device of a tray for loading / unloading a tray containing at least one optical disc onto a deck equipped with a turntable. The present invention relates to an optical disc player capable of driving a chucking device for chucking an optical disc to be seated.

In general, an optical disc player such as a compact disc driver (CDP) records a digital signal in the form of irregularities on a disc, and then reflects the light reflected by projecting light having high condensing power on the surface of the optical disc, such as a laser beam. An electronic device that receives and reproduces a recorded signal according to a difference in light quantity.

The optical disc changer includes a disc changer for taking out and recording / reproducing selected optical discs from a magazine accommodating a plurality of optical discs coaxially, and a drive device from a roulette for accommodating at least one optical disc in the same plane. There is a disc changer which rotates the roulette to record / play back the selected optical disc.

However, in a disc changer in which a roulette that accommodates at least one optical disc on the same plane as described above is rotatably mounted in the forward and reverse directions with respect to the tray by its driving device, it is seated on the seating surface of the roulette described above. And a front and rear drive of the tray for loading and unloading the tray on which the selected optical disk is located in the correct position, and a chucking device for chucking the optical disk seated on the deck's turntable. In addition, since power generation sources for driving them are different, the cost of manufacturing increases due to the increase in the number of parts of the optical disk changer.

In addition, due to the increase in the number of intermediate power transmission members that transmit the driving force from a predetermined power source to the drive unit of the tray and the drive unit of the chucking device, malfunctions and malfunctions often occur during the operation of the equipment, thereby reducing the reliability of the product from the user. To have.

Accordingly, an object of the present invention is to transmit power using a single power generating device when driving a chucking device for chucking an optical disk seated on a turntable and a forward and backward drive of a tray for loading / unloading a tray with respect to a deck of an optical disc player. It is to provide an optical disc player that can reduce the cost by reducing the number of parts used by reducing the path.

Another object of the present invention, the drive in the forward and backward direction of the cam gear and the chucking operation of the optical disk according to the forward and reverse rotation of the cam gear is made in order to ensure the reliable operation of the equipment by the control of the drive motor, thereby the equipment It is to provide an optical disc player that can significantly prevent the malfunction and failure of the system.

1 is an exploded perspective view of an optical disc player according to the present invention.

2 is a combined state diagram of an optical disc player according to the present invention;

3 is a plan view of a tray showing a state in which a driving device and a control device for driving the roulette according to the present invention are mounted;

Figure 4 is a state of use of the chuck chucking the optical disk on the turntable according to the present invention.

5 is a schematic plan view of a tray with a tray according to the present invention loaded on a deck;

Figure 6 is a schematic plan view of the main deck when the chucking device according to the present invention in an unchucking state.

FIG. 7 is a schematic side view of a chucking device driving part in the unchucking state of FIG. 6; FIG.

Figure 8 is a schematic plan view of the main deck when the chucking device according to the present invention in a chucking state.

9 is a schematic side view of the chucking device driving boolean in the chucking state of FIG. 8;

10 is a view of a cam of a drive device for loading / unloading a tray according to the present invention.

FIG. 11 is a schematic illustration of the mating of a tray that engages with the cam shown in FIG. 10 to load / unload the tray; FIG.

* Explanation of symbols for main parts of the drawings

1: drive motor 2,4: pulley

3: pulley 5: warp axis

6: worm wheel 7-9: optical disk seating surface

10-12: Optical disc recognition protrusion 13-15: Roulette display unit for position recognition

16 switch 17 printed circuit board (PCB)

18: first rack gear portion 19: second rack gear portion

20 turntable 22 drive device

23: main deck 24: optical pickup

25: sub deck 26: drive motor

27: pulley 28: first gear

29: second gear 30: cam gear

31: third gear 32: first tray gear

33: 2nd tray gear 34: 1st gear part

35: second gear part 36: third gear part

37: first gear part 38: second gear part

39: third gear 40: fourth gear

The object of the present invention described above is a main deck in which a forward / reversely driven drive motor is mounted at a predetermined position, a cam gear mounted on the main deck and forward / backward rotated by the drive motor drive, and a lower side of the cam gear. And a plurality of tray gears which selectively engage in a predetermined section of the rack gear, the upper side of which is opposed to the bottom of the tray, and which loads and unloads the tray with respect to the deck when the cam gear is driven. It is achieved by providing an optical disk player characterized in that it comprises a chucking device coupled to the main deck to be slidably movable on the main deck to chuck the optical disk seated on the tentable from the tray when the cam gear is driven. .

According to a preferred aspect of the present invention, the chucking device includes a slider cam mounted on one side of the upper surface of the main deck so as to be slidable and converting a rotational movement of the cam gear into a linear movement, and a sub-mountably mounted on the main deck. A chucking rod protruding from the side of the deck toward the main deck to move in a vertical groove formed on the side of the main deck during chucking and unchucking of the optical disc, and formed on one side of the slider cam to drive the chucking rod when driving the cam gear. And a slider groove for chucking and unchucking the optical disc by rotating the sub-deck as the shank moves in the vertical groove.

A preferred feature of the present invention is a plurality of optical disk positions indicating that the optical disk seating surface recognition protrusions are formed on the roulette circumferential surface rotatably mounted to the tray and that the optical disk selected by the roulette rotation is located at the correct position of the tray. A recognition protrusion, mounted at a predetermined position of the tray, and driving the roulette driving device when the selected optical disc is positioned at the correct position of the tray in contact with the optical disc seating surface recognition protrusion and the optical disc position recognition protrusion during rotation of the roulette; It further comprises a switch for controlling the drive of.

According to a preferred aspect of the present invention, a drive motor of a drive device mounted at a predetermined position of the tray to rotate the roulette forward and reverse and a power source of a switch controlling the selected optical disc at the time of rotation of the roulette are positioned at the correct position of the tray are connected. It further comprises a single printed circuit board.

According to a preferred feature of the present invention, the chucking device is formed in one side of the slider cam to indicate a chucking and unchucking state of the optical disc, and is formed in an initial state of pressing the side of the slider cam to the main deck. And a tension member selectively seated in the groove when the cam gear is driven to maintain the chucking and unchucking state of the slider cam.

According to a preferred feature of the present invention, the chucking device extends in the upper and lower ends of the slider groove and accommodates the chucking rods during chucking and unchucking of the optical disc due to the cam gear driving to accommodate the chucking and unchucking states of the slider cam. Characterized in that it further comprises a seating groove to maintain.

A preferred feature of the present invention is formed to be in contact with the rack gear of the tray at a predetermined position on the upper surface of the main deck, and in contact with the end of the rack gear when loading the tray to reduce the loading speed due to the inertial force of the tray And a tension member.

A preferred feature of the invention is formed on the upper surface of the chuck mounted to the main deck, and provided with a means for increasing the pressing force for pressing the optical disk against the turntable in close contact with the rotation of the optical disk, the initial rotation of the optical disk starts to rotate And preventing slipping with respect to the turntable when the rotation is stopped.

According to a preferred feature of the present invention, the pressing force increasing means is formed on the upper surface of the chuck continuously with each inclined surface inclined downward with respect to the rotational direction of the optical disk, the pressing force for pressing the optical disk by the air flow during the rotation of the optical disk It characterized in that it comprises a serration section for generating.

A preferred feature of the present invention is characterized in that it further comprises a hook portion formed on the inner circumference of the outer boss or the outer circumference of the inner boss which is formed concentrically on the upper surface of the chuck mounted on the main deck to support and fix the upper surface of the magnet by pressing. It is done.

According to a preferred aspect of the present invention, the cam gear is formed on the circumferential surface and sequentially rotates in the direction of the pre-chucking tray drive displacement angle, the chucking drive displacement angle and the post-chucking tray drive displacement angle when rotating in the forward direction within a predetermined angle range from the reference point. It is characterized by the distinction.

According to a preferred feature of the present invention, the cam gear is formed on the lower side of the entire circumferential surface and receives a driving force from the driving motor, and the first gear portion within the range of the tray driving displacement angle before the chucking. It is formed in the middle of the circumferential surface of the upper portion, and is formed on the second circumferential surface of the upper portion of the upper portion of the second gear portion within the range of the tray drive displacement angle after the chucking, and the second gear portion for driving the first tray gear and And a third gear part configured to be engaged with the second tray gear and driven.

According to a preferred feature of the present invention, the first tray gear is rotatably installed on the main deck and is engaged with the second gear portion of the cam gear and coaxially with the first gear. And a second gear engaged with the first rack gear formed on the bottom surface of the tray.

According to a preferred aspect of the present invention, the second tray gear may be rotatably installed on the main deck to be engaged with the third gear, and coaxially with the third gear to be disposed on the bottom surface of the tray. And a fourth gear engaging with the second rack gear formed to face the first rack gear.

Hereinafter, a preferred embodiment of the present invention will be described in detail according to the accompanying drawings.

1 is an exploded perspective view of an optical disc player according to the present invention, FIG. 2 is a schematic perspective view of a coupled state of FIG. 1, FIG. 3 is a plan view of a tray according to the present invention, and FIG. 4 is an optical disc according to the present invention. Fig. 5 is a plan view after the tray of the present invention is loaded onto a deck, and Figs. 6 to 9 are views related to the chuck caching apparatus of the present invention, and Fig. 10 is a view of the tray according to the present invention. FIG. 11 is a schematic configuration diagram of a tray gear that engages with the cam shown in FIG. 10 and loads / unloads a tray.

The roulette R is set at a predetermined position on the bottom surface of the tray T on which the roulette R for accommodating at least one optical disk on the same plane is seated. The drive motor 1 for rotating in the reverse direction is mounted, and the pulley 2 is integrally formed at the end of the rotation shaft 1A of the drive motor 1, and the drive motor (3) is mounted through the belt 3 on which the pulley 2 is seated. The worm shaft 5 having a pulley 4 receiving power from 1) is rotatably mounted with respect to the tray T, and is engaged with the worm 5A of the worm shaft 5 to drive the motor. The worm wheel 6 which decelerates the rotational force of 1) and rotates the roulette R in the forward and reverse directions with respect to the tray T at a predetermined speed is integrally formed in the center of the bottom surface of the roulette R.

The first to third optical disk recognition protrusions 10-12 for identifying the optical disks A, B, and C accommodated in the optical disk seating surfaces 7-9 on the circumferential surface of the roulette R described above are equally spaced apart. A first disc which is divided into a plurality of optical discs selected from among the optical discs AC accommodated in the optical disc seating surfaces 7-9 of the roulette R, and that the optical disc AC is positioned at the correct position of the tray T by its driving means. First to third optical disk recognition protrusions 10-12, wherein the third roulette position recognition display portion 13-15 is dividedly formed on the circumferential surface of the roulette R at regular intervals and formed on the circumferential surface of the roulette R; And driving the roulette R when the selected optical disk is located at the correct position of the trace T by detecting that the roulette R is rotated in contact with the first to third roulette position recognition displays 13-15. A switch 16 for controlling the power of the motor 1 is mounted at the tray T predetermined position.

Selected among the drive motor 1 of the drive device for rotating the above-mentioned roulette (R) in the forward and reverse directions with respect to the tray (T), and the optical disk (AC) seated on the optical disk seating surface (7-9) of the roulette (R) The switch 16 for controlling the rotation of the roulette R so that any optical disk is positioned at the correct position of the tray T is connected to a single PCB 17 mounted at the predetermined position of the tray T.

As shown in detail in the drawing, the first and second rack gear parts 18 and 19 having gears on both surfaces thereof are formed at predetermined positions on the bottom surface of the tray T described above, and the tray T is turned on the turntable ( The optical disk selected from among the optical disks mounted on the roulette R is mounted on the main deck 23 at a predetermined position by mounting the front and rear driving apparatus 22 for loading / unloading in the front-rear direction with respect to the sub deck 21 on which the 20 is mounted. The optical pickup 24 having the turntable 20 rotated by the spindle motor driving and the objective lens moving in the radial direction of the optical disk is mounted to the sub deck 25 rotatably mounted to the main deck 23. .

Drive device 22 of the tactical tray (T) is a drive motor 26 capable of forward and reverse rotation, rotatably mounted on the main deck 23 and connected to the drive motor 26 through the belt (V). A second gear 29 and a second gear 29 rotatably mounted to the main deck 23 in engagement with the pulley 27 and the first gear 28 formed coaxially with the pulley 27; A third gear portion 31 formed coaxially with (29) and engaged with the cam gear 30 rotatably mounted to the main deck 23; A first tray gear 32 and a second tray gear that are engaged with the first and second rack gear portions 18 and 19 of (T) to load / unload the tray T to the sub deck 25; 33).

The above-described cam gear 30 has a tray drive displacement angle θ1 before chucking, a chucking drive displacement angle θ2 and a post-chucking tray drive displacement angle θ3 during rotation in a positive direction within a range of 0 degrees to 360 degrees. ) Sequentially.

In addition, the above-described cam gear 30 is formed in the lower portion of the circumferential surface and the first gear portion 234 to receive the driving force by meshing with the third gear 31 of the tray (T) drive device 22, A second gear portion 35 formed at an end of the circumferential surface above the first gear portion 34 within the range of the tray driving displacement angle θ1 before chucking and driving in engagement with the first tray gear 33; and And a third gear portion 36 formed at an end portion of the circumferential surface of the second gear portion 35 within the range of the tray driving displacement angle θ3 after chucking and driving with the second tray gear 32. .

The first tray gear 33 described above is rotatably installed on the main deck 23 and is engaged with the second gear part 35 on the cam gear 30 by a first gear 37 and a first gear ( And a second gear 38, which is coaxial with 37 and engages with the first rack gear 18 of the tray T.

The second tray gear 32 described above is rotatably installed on the main deck 23 so that the cam gear 30 meshes with the third gear portion 36, and the third gear ( It is provided with the 4th gear | wheel 40 provided coaxially with 39 and meshing with the 2nd rack gear 19 of the tray T. As shown in FIG.

The inertial force is brought into contact with the end of the second rack gear portion 19 formed at the bottom when the tray T is loaded to the sub deck 25 by driving the driving device 22 at the predetermined position on the upper surface of the main deck 23 described above. Tension member (4) is formed to reduce the loading speed by.

The above-mentioned main deck 23 has a rail groove 42, 43 is formed in the left and right directions, the slider cam is slidably coupled to the rail groove 42, 43 formed on the upper surface of the cam gear 30. A guide 45 selectively coupled to the boss 30A to receive the rotational movement of the drive device 22 of the tray T in a linear motion is formed integrally with the 44.

The sub-deck 25 on which the turntable 20 and the optical pickup 46 are mounted on the main deck 23 is pivotally fixed by the hinge pin 47, and the chucking rods are formed on one side of the sub-deck 25. 48 is formed to protrude toward the main deck 23, the vertical groove (49) is formed on one side of the main deck 23, the chucking rod 48 is moved up and down by driving the slider cam 44, the slider cam ( 44. Slider groove 50 for rotating the sub-deck 25 around the hinge pin 47 by rotating the chucking rod 48 in the vertical groove 49 when the slider cam 44 is driven on one side. ) Is formed to be inclined, and the extension grooves 50A and 50B to which the chucking rods 48 are seated when chucking / unchucking the optical device on the turntable 20 by driving the slider cam 44 at both ends of the slider groove 50 are provided. Each is formed.

Grooves 51 and 52 are formed on one side of the slider cam 44 to indicate chucking and unchucking states of the optical disk, and are selectively coupled to the grooves 51 and 52 by driving the slider cam 44. The tension member 53 which press-supports the side of the slider cam 44 and imparts stability to the operation during chucking and unchucking is integrally formed as an initial state of pressing the side of the slider cam 44 against the main deck 23. .

On the other hand, the pressing force for pressing the optical disk against the turntable 20 by the air flow during the rotation of the optical disk on the upper surface of the chuck 54 for chucking the optical disk seated on the turntable 20 mounted on the sub-deck 25 described above. The serration section 55 is formed so that each inclined surface 56 is inclined downward with respect to the rotational direction of the optical disk.

On the upper surface of the chuck 54 described above, bosses 58 and 59 are formed concentrically to accommodate the magnets 57 for chucking the optical disk seated on the turntable 20 by magnetic force. Several hooks 60 are formed on the peripheral edge to prevent the magnet 57 from being pressed against each other by close contact.

Referring to the operation of the present invention configured as described above, as shown in Figure 3, the optical disk (C) which is seated on the optical disk seating surface 9 of the roulette (R) is rotated forward and reverse with respect to the tray (T) As the user drives the drive motor 1, its rotational force is applied to the pulley 4 of the pulley 2, the belt 3, and the worm shaft 5 mounted at the end of the rotation shaft 1A-rotation shaft 1A. Since it is transmitted in sequence, the worm rim shaft 5 is driven, and the drive motor 1 is driven by the worm wheel 6 formed at the center of the worm wheel 5A and the bottom of the roulette R engaged with the worm rim shaft 5. The rotational force of the motor decelerates at a predetermined speed to rotate the roulette R at a low speed.

As a result, the optical disc C received and selected by the optical disc seating surface 9 is positioned at the correct position of the tray T by the rotation of the roulette R.

Subsequently, when the roulette R is rotated a little further by the driving device thereof, the switch unit in which the second optical disk seating surface recognition protrusion 11 formed on the circumferential surface of the roulette R is mounted at a predetermined position of the tray T ( 16 is in contact with the roulette position recognition display projection portion 16A of the second 16, the roulette R is rotated a little more so that the second optical disk position recognition projection portion 14 of the roulette (R) and the roulette of the tray (T) 16A of position recognition display protrusions come into contact, and the optical disk C seated on the optical disk seating surface 9 is located in the correct position of the tray T, and the turntable 20 of the sub deck 25 is carried out. It is located in the phase.

At this time, when the roulette position recognition display projection 16A of the switch 16 is located between the second optical disc position recognition projections 9 of the roulette R in the microcomputer (μ-com) of the switch 16, the roulette (R) The rotation of the roulette R is stopped by cutting off the power supply of the drive motor 1 of the driving device.

Referring to FIG. 5, when the tray T is loaded to the sub deck 25 while the tray T is opened, the driving motor 26 capable of forward and reverse rotation mounted on the main deck 23 is driven. This rotational force rotates the pulley 27 rotatably mounted to the main deck 23 through the belt (V) in the counterclockwise direction, and the first gear 28 formed on the coaxial axis of the pulley 27 and The second gear 29 to be engaged is rotated in the clockwise direction, and the cam gear 30 engaged with the third gear 31 formed on the coaxial of the second gear 29 is rotated counterclockwise. Therefore, the driving force of the cam gear 30 is transmitted to the second gear part 35, the first gear 37, the second gear 38, and the tray T of the first tray gear 33. Therefore, the tray T is loaded to the sub deck 25 by the first tray gear 33 meshing with the cam gear 30.

Next, when the cam gear 30 is continuously rotated while the tray T is loaded, the boss 30A formed at one side of the upper surface of the cam gear 30 has a groove formed in the guide part 45 of the slider cam 44. 45A).

Accordingly, as the rotational movement of the drive device 22 of the tray T is converted into a linear movement, the slider cam 44 moves to the left along the rail grooves 42 and 43 formed in the main deck 23. As a result, the protrusion 53A of the tension member 53 formed integrally with the main deck 23 is separated from the groove 51 of the slider cam 44, and at the same time, as shown in FIG. The chucking bar 48 located in the vertical groove 49 of the main deck 23 and the extension groove 50B extending downward of the slider groove 50 of the slider cam 44 moves the position of the slider cam 44. As a result, the slider groove 50 moves upward in the vertical groove 49 of the main deck 23.

Therefore, the sub deck 25 is rotated to the upper side where the chuck 54 is formed by using the hinge pin 47 hinged to the main deck 23 as the hinge axis.

As shown in FIG. 8, the slider cam 44 is completely moved to the left side by engagement of the guide portion 45 of the boss 30A and the slider cam 44 by the continuous rotation of the cam gear 30. As a result, the protrusion 53A of the tension member 53 formed integrally with the main deck 23 is seated in the groove 52 of the slider cam 44.

At the same time, as shown in FIG. 9, the chucking rods 48 of the sub deck 25 are moved upward from the vertical grooves 49 formed in the main deck 23 by the slider grooves 50 of the slider cam 44. It is moved to be seated in the extension groove (50A) formed to extend above the slider groove (50).

Therefore, as the optical disc seated on the turntable 20 is brought into close contact with the chuck 54 formed on the main deck 23 by rotating the sub deck 25 upward, the chucking operation of the optical disc is completed.

As a result, the optical disk is also rotated as the turntable 20 rotates at a predetermined speed by driving the spindle motor, which is not mounted on the sub-deck 25, and the optical beam is moved by the optical pickup 46 moving in the radial direction of the optical disk. Since it is irradiated, predetermined recording / reproducing is possible.

Finally, the state in which the tray T is unloaded while the selected optical disk is seated in the roulette R is chucked. In the initial state of the tray driving displacement angle θ3 after the chucking of the cam gear 30, the protrusion is formed. The piece 30A is separated from the chucking device, and the third gear portion 36 of the cam gear 30 engages with the second gear portion 32. When the cam gear 30 rotates forward in such a state, the driving force of the cam gear 30 is the first gear part 34, the third gear 39 of the tray gear 32, the fourth gear 40 and the like. As the tray T is transferred to the tray T through the second rack gear portion 19 of the tray T, the tray T is unloaded during chucking. In addition, when the cam gear 30 is rotated in the unloaded state of the tray T, the second tray gear 32 is rotated forward to load the tray T.

Therefore, as the cam gear 30 is rotated forward and backward within the tray driving displacement angle θ3 of the cam gear 30 after chucking, the driving force of the cam gear 30 is increased by the third gear portion 36 and the second tray. It is transmitted to the gear 32 and the second tray gear 32 and the second rack gear portion 19 of the tray T, respectively, so that the tray T is unloaded and loaded in the chucking state of the optical disk.

As described above, according to the optical disc player according to the present invention, a single power generating device enables loading and unloading of trays and chucking of optical discs, and by providing a cam gear formed in multiple stages, a plurality of gears can be used. It reduces the number of parts used by the transmission and divides it into a number of displacement angles for the rotation of the cam gear. The chucking and unchucking and tray driving devices are operated continuously according to the forward and reverse rotation of the cam gear. It simplifies control to ensure reliable operation of the equipment and at the same time prevents failures and malfunctions during use.

Claims (6)

The main deck is mounted to a predetermined position the drive motor is rotated forward and reverse, A cam gear mounted on the main deck and rotated forward and reverse by driving the drive motor; A plurality of tray gears configured to be engaged with a rack gear having a lower side selectively engaged in a predetermined section of the cam gear, and an upper side engaged with a rack gear formed to face the bottom of the tray, and to load / unload the tray with respect to the deck when the cam gear is driven; A chucking rod that is moved up and down in the vertical groove of the slider cam and the main deck side, a slider groove for chucking / unchucking an optical disc according to the movement of the chucking rod, a groove for displaying a chucking / unchucking state of an optical disc, the slider cam Chucking device consisting of a tension member and a seating groove to maintain the chucking and unchucking state of the; A roulette driving device for driving a roulette on which an optical disk is mounted; A plurality of optical disk seating surface recognition protrusions which are dividedly formed on the roulette circumferential surface rotatably mounted to the tray; A plurality of optical disc position recognition protrusions for indicating that the optical disc selected by the roulette rotation is arranged at the correct position of the tray; A switch configured to control the roulette driving device when the selected optical disc is brought into contact with the optical disc seating surface recognition protrusion and the optical disc position recognition protrusion when the roulette rotates; A single printed circuit board mounted with the switch electrically connected thereto; Another tension member in contact with the rack key to reduce the inertial force of the tray; And a pressing force increasing means formed on the upper surface of the chuck continuously inclined downward with respect to the rotational direction of the optical disk so that the optical disk can be pressed against the turntable when the optical disk is rotated. The method according to claim 1, And a hook portion formed on the inner circumference of the outer boss or the outer circumference of the inner boss formed concentrically on the upper surface of the chuck mounted to the main deck to squeeze and fix the upper surface of the magnet. The method of claim 1, wherein the cam gear, An optical disc player, characterized in that it is formed on the circumferential surface and is sequentially divided into a tray driving displacement angle before chucking, a chucking driving displacement angle and a chucking tray driving displacement angle when rotating in a forward direction within a predetermined angle from a reference point. The method of claim 3, wherein the cam gear, A first gear part formed at a lower side of the entire circumferential surface and receiving a driving force from the driving motor; A second gear part which is formed in the middle of the circumferential surface of the upper portion of the first gear part within the tray driving displacement angle range before the chucking and is engaged with the first tray gear to drive the first gear; And a third gear portion formed above the circumferential surface of the upper portion of the second gear portion within the tray driving displacement angle range after the chucking, and having a third gear portion engaged with the second tray gear for driving. The method of claim 4, wherein the first tray gear, A first gear rotatably installed on the main deck and engaged with the second gear part of the cam gear; And a second gear disposed coaxially with the first gear and engaged with the first rack gear formed on the bottom surface of the tray. The method of claim 4, wherein the second tray gear, A third gear rotatably installed on the main deck and engaged with the third gear; And a fourth gear disposed coaxially with the third gear and engaging with a second rack gear formed on the bottom surface of the tray to face the first rack gear.