Abstract: A method and device for protecting slot-in optical disc drive are provided. A first sensing switch is for detecting the action of an unloading unit, a second sensing switch is for detecting the action of a receiving unit, and a third sensing switch is for detecting the action of a positioning bar. A disc is inserted as the optical disc drive is at the initial state, and the states of the first, second and third sensing switches are detected. The transmission unit is activated to automatically load the disc as all sensing switches are turned on, and whether the state of the third sensing switch changes is checked. When the state of the third sensing switch changes, the extraction of the disc is detected, so the transmission unit is immediately reversed to execute the unloading of the disc, so as to protect the optical disc drive.

Abstract: A disc device includes a casing, a disc processor, a drive motor, a transfer unit and a disc clamper. The transfer unit transfers an optical disc while holding the optical disc by driving the drive motor. The disc clamper switches a drive transmission of the drive unit in accordance with a holding condition of the optical disc with different diameters by the transfer unit to pivotally move the disc processor. The drive of the single drive motor effects both the transfer of the optical disc and the pivotal movement of the disc processor. A timing for transferring the optical disc and a timing for pivotally moving the disc processor can be suitably adjusted in accordance with the diameter of the optical disc.

Abstract: An optical disc device capable of removing an optical disc not to damage an optical disc and an optical disc device even if two piled optical discs are inserted into the optical disc device is provided. Even if two piled optical discs 12 are pushed forcibly into the optical disc device, the insertion of two piled optical discs 12 can be prevented with the cooperation of the fixed guiding portion 41 and the thickness restricting member 43. Since the thickness restricting member is turned in the ejecting direction when two piled optical discs are pulled out, two piled optical discs 12 can be taken out easily not to damage the optical disc 12 and the optical disc device 10.

Abstract: In an optical disk apparatus for recording and/or reading information with respect to an optical disk, comprising, a chassis for containing the optical disk, and a tray being movable with respect to the chassis and adapted to support the optical disk thereon so that the optical disk is movable with respect to the chassis, the chassis has an opening for discharging an air from an inside of the chassis to an outside of the chassis through the opening.

Abstract: An optical disc drive includes a main chassis, a deck unit mounted on the main chassis to move upward and downward, and a slider installed movably on the main chassis. The slider moves the deck unit upward and downward while moving on the main chassis and an impact absorbing member, interposed between the slider and the deck unit, absorbs an impact transmitted to the deck unit.

Abstract: A disc unit includes: a slide stopper adapted to switch a state of the unit between an initial state, a guide-restricted state and a movement-unrestricted state by sliding in right or left direction; and a first plate spring and a second plate spring for biasing the slide stopper in the guide-restricted state or the movement-unrestricted state in a direction to return to an initial position. With this arrangement, the slide stopper can be constantly returned to the initial position unless in the guide-restricted state and the movement-restricted state. Thus, with a simplified arrangement, the disc unit can be switched between the initial state, the guide-restricted state and the movement-unrestricted state.

Abstract: An optical disc drive to prevent entry of dust through a front side of a tray and includes a housing including a first opening, a shielding member disposed to shield the first opening at a distance from a front side of the housing, and including a second opening, and a tray inserted in the first and the second openings to shield the second opening and loaded into and unloaded from the housing. Thus, since sponge or padding is not dedicatedly used, cost can be saved. In addition, since the manufacturing process is simplified, productivity can be improved.

Abstract: A disc drive apparatus includes an external frame 100 having a disc insertion opening 101, right and left arms 400 and 401, and a spring S10. The right and left arms 400 and 401 holds an outer peripheral portion of an optical disc 102 which is inserted from the disc insertion opening 101 as they rotate along the outer peripheral portion of the disc 102 in accordance to the position of the disc inserted from the disc insertion opening 101. The spring S10 applies forces such that ends of the pair of right and left arms 400 and 401 on the disc insertion opening side pull each other.

Abstract: An optical disc drive for reducing impact forces in driving an optical pick-up unit is provided. The optical disc drive for driving an optical disc includes an optical pick-up unit, a guide bar, a rack, and a driving unit. The optical pick-up unit is configured for reading data from or writing data to the optical disc. The guide bar penetrates through the optical pick-up unit for supporting the optical pick-up unit. The rack engagably receives a part of the optical pick-up unit. The rack defines a slot therein. The slot extends along a direction substantially parallel with an extending direction of the guide bar. The driving unit is mechanically coupled to the rack. The driving unit drives the rack and the optical pick-up unit to move along a radial direction of the optical disc to track the optical disc.

Abstract: A disc emergent ejecting mechanism for an optical disc drive is disclosed that includes a drive motor; a first gear set in meshing engagement with the drive motor; an advancing and retracting member; a second gear set in meshing engagement with the advancing and retracting member; and a clutch assembly including a clutch gear engaged with the first and the second gear sets for transmitting torque from the drive motor to the advancing and retracting member. During a disc emergent ejecting operation, the clutch gear is moved to disengage with the second gear set.

Abstract: An optical disc drive suitable for reading a data in an optical disc is provided. The optical disc drive includes a housing, a tray suitable for carrying the optical disc, and a panel. The housing has a first opening, and the panel is disposed at the first opening. The tray is disposed in the housing. The tray has a blocking plate. The blocking plate is disposed on a front edge of the tray, and multiple protrusions are disposed on an upper edge of the blocking plate. Furthermore, the panel has a second opening, and the second opening has multiple notches corresponding to the protrusions. The tray is suitable for exiting out of the housing through the second opening, and the protrusions are suitable for passing through the notches.

Abstract: A media device including a disc tray moved by two motors.

Abstract: The invention is to provide a gear holder in an optical disk drive, wherein a bolt upwardly protrudes from the bottom of a casing. A screw hole is disposed in the center of the bolt inserted by a wheel hole on the center of a gear. The height of the wheel hole is lower than the height of the bolt. A ring flange protrudes under the peripheral of a through hole disposed on a support cover. The width of the ring flange is equal to the width of the bolt, and the height thereof is equal to the height difference from the bolt to the wheel hole. The support cover is fastened on the bolt by a screw screwed in the screw hole, and then the gear is held and rotates between the casing and the support cover. The ring flange presses on the top of the bolt to maintain a rotation space.

Abstract: A disk device includes a disk tray movable between a closed position and an open position; and an upper case positioned above the disk loading region of the disk tray when the disk tray is at the closed position. The disk tray includes a base, a disk loading region which receives the disk, and an upward facing projection formed on a closed position side of the disk loading region. The upper case includes an upper ceiling portion, a downward facing projection that projects downward from the upper ceiling portion, and an inclined surface formed between the upper ceiling portion and the downward facing projection so as to be inclined downward in a direction toward the closed position. The upward facing projection is positioned on the closed position side relative to the downward facing projection when the disk tray is at the closed position.

Abstract: A recording medium playback device, which enables to decrease time and labor required for a passenger to exchange the recording media, is provided. A CD player 1 includes a device body 3, conveying unit 5, playback unit 5, and holding member 7. The device body 3 is provided with an insertion opening 10. The conveying unit 5 takes a CD 2 into and out from the device body 3. The playback unit 6 reads out information recorded in the CD 2. The holding member 7 holds the CD 2 ejected outside the device body 3 in cooperation with an inner edge of the insertion opening 10. The holding member 7permits a new CD 2a to be inserted into the device body 3 on a condition that the holding member 7 holds the CD 2.

Abstract: An apparatus and a method of ejecting a disc for a disc drive. The disc drive at least includes a bottom casing and a tray. The tray is used for carrying a disc. The disc loading apparatus for a disc drive includes a protruding portion and a brake pad. The protruding portion is disposed on the bottom casing. The brake pad is movably disposed at the tray. When the tray is moved with respect to the bottom casing for enabling the protruding portion to interfere with the brake pad, the protruding portion pushes the brake pad to projects towards the disc for interfering with the disc so that the disc is halted and pushed up.

Abstract: An information handling system includes an optical disc drive. The optical disc drive is connected to an auxiliary power source so that a drive tray of the optical disc drive can be opened or closed, or a disc inserted or ejected from the optical disc drive when the information handling system is in a low-power mode. In response to these actions in the low-power mode, information is stored to record that the drive tray has been opened or closed. Accordingly, when the information handling system returns to a normal mode, it can take appropriate action, such as dismounting a logical volume associated with a disc that was previously in the drive. Because the optical disc drive can be physically accessed in the low-power mode, the information handling system does not have to enter the normal power mode in order for discs to be retrieved or inserted.

Abstract: A media storage system includes a disc input element for receiving a media disc, a disc output element for ejecting a disc, and a media reader for reading information from a disc. If insufficient information is readable from a disc, it may be obtained through a computer network. The system includes a disc transporter for moving received discs to respective internal storage locations. The system includes a data input device for entering disc catalogue data and a data output device such as a display for displaying disc catalogue data. The data input and output devices may be input buttons and a display on a remote control. Each disc and related information is associated with an identifier such that access to disc data may be by restricted by user identifier or content ratings.

Abstract: According to one embodiment, an optical disk drive apparatus has a case, a disk tray, a first connector, a second connector, and a positioning mechanism. The first connector is provided on the case. The second connector is provided on the disk tray, has a conduction with the first connector when the disk tray is in a first position, and is separated from the first connector when the disk tray is in a second position. The positioning mechanism is provided between the case and the disk tray, and positions the second connector with respect to the first connector when the disk tray moves from the second position to the first position.

Abstract: According to one embodiment, a disc drive apparatus includes a main frame having sidewalls and first and second guides disposed on the sidewalls and opposed to each other, a recording medium holder configured to hold a disc recording medium, a medium drive section, and an ascent/descent retaining member which supports the medium drive section and is attached to the main frame for ascent and descent. The retaining member includes a pair of arm portions, a connecting portion which connects respective one-end portions of the arm portions, pivotal portions arranged on the respective other end portions of the arm portions and supported on the sidewalls, and first and second engaging portions disposed on the respective one-end portions of the arm portions for engagement with the first and second guides, respectively. The first guide is formed of a leaf spring and configured to urge the retaining member toward the second guide.

Abstract: An optical disc apparatus, comprising: a tray 20 being provided to be movable between a first position where an optical disc can be loaded therein and a second position where information is readout from said optical disc loaded; and a housing 10 supporting said tray to be slidable, and including an electronic circuit board in a part thereof, wherein the tray mounts thereon various kinds of parts including a pickup 30, a disc motor 31, and a control portion for controlling them, and is electrically connected between the electronic circuit board of the housing through a flexible cable, which is provided under condition of being bent within the housing, wherein a reinforcing sheet shaped 50 into waveform at the end portion thereof for dispersing the stresses is adhered in a part of a bent region of the flexible cable, which moves accompanying with movement of the tray when the tray moves between the first position and the second position.

Abstract: A disk device includes a disk tray, a spindle motor, a chucking section, a loading motor, a tray-in switch, a tray-out switch and a loading motor drive voltage generating section. The loading motor drive voltage generating section generates a drive voltage for the loading motor so that a torque of the loading motor is gradually increased after the tray-out switch detects that the disk tray is not located at a predetermined range between an eject position and a retract position until the tray-in switch detects that the disk tray is located at the retract position.

Abstract: An optical disc access control and storage apparatus containing a rotating plate for storing discs thereon and rotating the same, a first disc-pushing mechanism for moving a disc along its radial direction from the rotating plate to a second disc-pushing mechanism wherein the second disc-pushing mechanism has a positioning slot for positioning the disc, an auxiliary-fixing mechanism for fixing the disc positioned in the positioning slot, a seizing mechanism for seizing the disc, a rotating mechanism fixed to the seizing mechanism for rotating the seizing mechanism, a coordinate-displacing mechanism connected to the rotating mechanism for controlling the horizontal and vertical positions of the seizing mechanism and at least one disc player for receiving the disc released from the seizing mechanism.

Abstract: A lift frame supports a turntable unit, and moves between a lower-most position and a read/write position in conjunction with slide movement of a follower slider. The follower slider has a pressing member and a cam groove. Pressed to a bottom plate of a device chassis by a coil spring, the pressing member stabilizes the movement of the follower slider. The cam groove fits onto a lifting pin of the lift frame. At the read/write position, the cam bottom wall is constituted of a pin pushing portion. The pin pushing portion is pushed upward by the coil spring to press the lifting pin to a cam groove upper wall when the lift frame is in the read/write position.

Abstract: A disk apparatus comprising a chassis outer sheath having a base body and a lid, in which a front surface of the chassis outer sheath is formed with a disk inserting opening into which a disk is directly inserted, a spindle motor and a pickup are held by a traverse provided on the base body, a slider mechanism is disposed on one end of the traverse, the slider mechanism includes a vertically moving cam mechanism which brings the traverse close to and away from the base body, wherein a cam groove of the vertically moving cam mechanism comprises a first cam portion which moves together with the slider mechanism and a second cam portion which is displaced with respect to the first cam portion, when a vertically moving pin of the vertically moving cam mechanism exceeds a predetermined height in the cam groove, the second cam portion rises and the second cam portion limits movement of the vertically moving pin, and when the vertically moving pin is equal to or lower than the predetermined height in the cam groove,

Abstract: An optical disc device capable of sensing exactly whether or not a disc is present is provided. In an optical disc device includes a main body having a disc slot, and a carrying roller for carrying a disc between the disc slot and a disc loading position of the main body, a swinging lever whose base end is supported turnably in an inside of the main body by a supporting shaft and to which a disc arriving switch is fixed, and a sensing lever whose base end is supported turnably by the supporting shaft and whose top end contacts the outer periphery of the disc, which is loaded in the disc loading position, to operate the disc arriving switch are provided.

Abstract: The present invention provides a disk storage apparatus including a base, a transmission unit, an actuation unit, and a tray. The transmission unit is disposed on the base. The transmission unit is movably connected to the actuation unit. The tray is provided to support at least one disk. The tray and the transmission unit are movably connected to each other. The actuation unit drives the transmission unit to cause the tray to move relatively to the base.

Abstract: A medium is transferred and loaded to a media tray provided with a media processing unit which is operable to perform information processing on the medium, by using a transfer arm of a media transfer mechanism. A distance from a surface of the medium loaded on the media tray to a reference position of the transfer arm is acquired. A difference between the acquired distance and a predetermined distance from a reference surface of the media tray to the reference position of the transfer arm is calculated. It is determined that a double transfer of the medium to the media tray occurs when the calculated difference is larger than a predetermined threshold value.

Abstract: A disc accessing apparatus and its panel are provided. The disc accessing apparatus includes a housing, a panel with an opening for a disc to pass, a surface slanted towards the opening and an engagement portion. When a disc cannot be ejected from the disc accessing apparatus normally, the surface leads the disc out. In case the disc cracks into pieces during high-speed rotation, the pieces strike the surface to generate a force that makes the engagement portion and the housing engage more tightly.

Abstract: A recording and reproducing apparatus includes a tray disposed within an outer casing and movable along a tray moving direction between retracted and extended positions. A positioning structure includes a locking member fixed on the outer casing, and a support member for immobilizing the locking member with respect to the outer casing in such a manner that the locking member extends upwardly into the outer casing to prevent movement of the tray with respect to the outer casing. A protrusion portion of the outer casing surrounding the locking member and extending in the moving direction defines the support member.

Abstract: According to one embodiment, a control method of an information processing device, includes measuring a movement amount of a body with a sensor, invalidating an operation of a switch which ejects an optical disc held in an optical disc drive, in a case where the movement amount of the body is a threshold value V1 or more, and validating the operation of the switch in accordance with a measured value of the sensor, after invalidating the operation of the switch.

Abstract: There is provided a disc drive by which the fluid loss of a disc is reduced and the electric power consumption of a spindle motor can be decreased. In the disc drive according to the present invention, a rotation load reducing member is provided between a top cover and the disc. The rotation load reducing member is movably supported by a clearance adjustment member. While the disc is rotating, the rotation load reducing member is moved in the direction approaching the disc. Thereby, the thickness of an air layer on the upper surface of the disc is decreased.

Abstract: An optical disk device including a tray in which recording mediums having differing outer diameters can be selectively mounted. The tray carries the recording media into the main body of the optical disk device wherein it is, chucked by a turntable. Holding members for holding the recording medium at a predetermined position relative to a mounting face of the tray are provided in a front portion and a rear portion respectively relative to the transport direction of the tray. At least one of the holding members is movable between a first holding position for holding a small diameter recording medium, and a second holding position for holding a large diameter recording medium. The holding member is biased toward the first holding position by a biasing member.

Abstract: An optical disk player includes a chassis, an optical pick-up head including a support member defining a guiding slot, and a guiding member molded integrally with the chassis, wherein the guiding member is received in the guiding slot and the optical pick-up head is slidably supported on the guiding member.

Abstract: A slider is mounted on a chassis forming a frame so as to be movable in a first direction, and is configured to start a movement in conjunction with an operation in which an optical pickup is switched from an operation mode into a non-operation mode and returns to an initial position. A disk tray is mounted on the chassis so as to be movable in a second direction perpendicular to the first direction, is configured to move in conjunction with the movement of the slider, and is provided with a first groove extending in the first direction. A protrusion is provided in the slider and is engaged with the first groove when the disk tray moves, thereby preventing the disk tray from moving in the second direction. A second groove is provided in the disk tray, communicates with the first groove, and introduces the protrusion into the first groove when the disk tray is moved.

Abstract: When an optical sensor 410 disposed near an opening of a casing 110 detects an optical disc 10, a disc processing section 200 is rotated to a retracted position where a rotating shaft 222A is retracted from the moving path of the optical disc 10. When the optical disc 10 moves to a certain position from the opening, the loading unit 400 loads the optical disc 10. When the optical disc 10 is located at a loading-completion position, a sensing switch 420 is turned off, and the disc processing section 200 is rotated to an advanced position where the rotating shaft 222A is advanced onto the moving path to rotatably support the optical disc 10. In response to a request for ejecting the optical disc 10, the disc processing section 200 is rotated to the retracted position to release the rotatably supporting state and the loading unit 400 is activated to eject the optical disc 10.

Abstract: A disk drive includes an outer casing having a front side formed with a tray opening, a tray disposed within the outer casing and movable with respect to the latter between retracted and extended positions and a tray cover attached to a front side of the tray. A resilient structure is interposed between the tray and the cover to provide a resilient force therebetween such that when the tray is retracted into the outer casing, the tray cover sealingly covers the tray opening in the front side of the outer casing by virtue of the resilient force provided by the resilient structure.

Abstract: A media processor, such as an optical disk publisher, is capable of efficiently discarding media such as a defective CD without using a manual discarding process. At the time of media publication of an optical disk publisher 5, blank media 14 stored in a supply-side stacker 13 is taken out by a media conveying mechanism 12 and is conveyed to a media drive 15, and predetermined data is written into the blank media 14. Printing is performed on printing surfaces of the media into which data has been normally written by means of a label printer 19. The published media is stored in a storage-side stacker 22. Defective media on which a failure in writing has occurred is disposed of so as not to be readable by mechanically destroying a recording surface of the defective media by means of a media disposal mechanism while moving the defective media in a state where the defective media is mounted on a media tray 71 of a printer 19. Discarded media after the disposal is ejected from a media outlet 25.

Abstract: A multi function recorder and printer feeds discs to be processed through a gravity feed system reducing idle time of a recorder. A drive mounting system allows easy replacement and upgrade of drives without recalibration of the system. A passive picker moves discs between components.

Abstract: To prevent deformation of a chassis due to an impact force in an optical disc apparatus, there is provided a tray for inserting/ejecting an optical disc into/from an apparatus body, with the chassis connected thereto through vibration proof materials in plural portions in a surface opposite a disc placing surface. The tray has projecting portions projecting in a chassis direction in positions facing the chassis in peripheral portions of the plural connecting portions. The projecting portion is located at a position higher than a tray plane with which the vibration proof material comes into contact, and lower than the surface of a chassis facing the tray. When the vibration proof material is compressed and deformed due to the impact force, the projecting portion comes into contact with the chassis facing surface, to reduce the amount of deformation of the vibration proof material and thereby prevent deformation of the chassis.

Abstract: A holding mechanism is operable to hold a top medium from a plurality of plate-shaped media accommodated in a stacker in a stacked manner. A transport arm supports the holding mechanism. The transport arm is provided with a separation mechanism operable to separate a second medium positioned just below the top medium which is held by the holding mechanism.

Abstract: A holding mechanism is operable to hold a top medium from a plurality of plate-shaped media accommodated in a stacker in a stacked manner. A transport arm supports the holding mechanism. When the lift mechanism lifts down the transport arm, one of a first elastic pressing force and a second elastic pressing force greater than the first elastic pressing force is selectively applied from the holding mechanism to an upper surface of the top medium.

Abstract: The present invention provides an improved media device having an improved design for providing efficient operation and improved print and recording speed to one or more storage devices. In one aspect, the present invention provides a media device having a rotatable disc carousel that has a plurality of disc receptacles for storage of storage media and a disc transport that is configured for movement along multiple disc engagement axes for transportation of storage media to the plurality of receptacles of the rotatable disc carousel and to the media components of the media device. In another aspect, the present invention provides a media device having a disc carousel with rotational means adapted to operate independently of the disc transport. In yet another aspect, the present invention meets the above needs by providing a media device having printer means adapted to operate independently of a disc transport.

Abstract: An optical disk device includes: a disk motor for rotating an optical disk D inserted into a package; an optical pickup that moves in a radial direction of the optical disk, for controlling recording information on the optical disk or reading information from the optical disk; a chassis that is a base for supporting the disk motor and the optical pickup to chuck the optical disk directly inserted into the package to the disk motor; a motor plate that secures the disk motor to the base and that has one side, where the optical pickup is not located, supported by the base and the other side overhanging; and a raised portion for buffering elastic deformation of the optical pickup side of the disk motor plate.

Abstract: A loader chassis is provided with a tray-out switch and a switch lever which is configured to operate the tray-out switch. A disk tray is mounted in the loader chassis in a movable manner between a mounted position and a ejected position in a moving direction and formed with a switch rib which has a first slope surface. The first slope surface has a concave curve shape with respect to the moving direction. When the disk tray is being ejected toward the ejected position, the first slope surface of the switch rib pushes the switch lever so that the switch lever operates the tray-out switch, thereby stopping a voltage supply to a drive motor of the disk tray.

Abstract: The present invention is an electronic apparatus including: an electronic apparatus main body 1; a panel main body that has a first guided component guided by a first guide groove C1 formed in the electronic apparatus main body, and moves in an inclined state with respect to the electronic apparatus main body; and a hold plate 6 that has a second guided portion guided by a second guide groove C2 formed in the electronic apparatus main body, and slidably holds the panel main body. According to the present invention, a mechanism for tilting the panel main body and a mechanism for sliding the panel main body are provided separately from each other, so that the panel main body having an increased weight can be operated smoothly in the inclined state.

Abstract: To eliminate scratches on a disc surface of an optical disc in an emergency eject operation, there is provided an optical disc apparatus including: an emergency eject detector for detecting an emergency eject instruction; a rotation speed detector for producing a signal corresponding to the rotation speed of the optical disc; and a logical circuit unit which is operated by a first signal from the emergency eject detector and a second signal from the rotation speed detector, and when the second output signal is not more than a reference level, produces a third signal so as to input a control signal for instructing stop of the actuator control into an actuator controller. After detection of the emergency eject instruction, the apparatus performs the actuator control without producing the third signal until the rotation speed is not more than a predetermined value. Thus the objective lens is made in a focus control state or in a saving state in which the objective lens is separated from the disc surface.

Abstract: When storage of an optical disc in which information has been recorded is started, a pair of rollers rotate while holding the optical disc inserted through an insertion/ejection slot of a body of an optical disc device, so that the rollers convey the optical disc to the inside of the body. On this occasion, circumferential edge sensing units provided in the inside of the body sense a circumferential edge of the inserted optical disc continuously to thereby sense the outer diameter, shape and insertion state of the inserted optical disc. The optical disc is ejected when decision is made that there is abnormality.

Abstract: A disk drive apparatus includes: a disk table on which a disk recording medium inserted into a disk insertion port for loading is mounted; an eject lever rotatably supported by a chassis, and having a disk holding part that holds the inserted medium; and a support lever rotatably supported by the chassis and having a disk holding part, wherein these levers are rotated between a waiting position at which the disk holding part waits for the inserted medium and a drawing position at which the medium held by the disk holding part is drawn, wherein when the eject lever and the support lever are at the waiting positions, the disk holding parts are each positioned at a position which is located more on the disk insertion port side than a centering projecting part of the disk table and is not overlapped with the insertion direction of the medium.

Abstract: An optical disk player with improved opening and closing of a door, transport of a tray, and an improved pivoting structure of a chassis to pivot a turntable. The optical disk player includes: a body; a tray to move in and out of the body so as to transport an optical disk; a chassis installed to pivot inside the body; an optical pickup, which is installed to be able to move back and forth in the chassis, to record/reproduce information onto/from the optical disk that is rotatably placed on the turntable; a cover installed on a front of the body, the cover including: a door holder with an aperture through which the tray moves; a door to be able to slide along the door holder so as to open and close the aperture; and a cam driving device to activate the tray, to pivot the chassis, and to open and close the door by sliding.