JPH07121963A - Gear transfer device - Google Patents

Abstract

PURPOSE:To obtain a gear transfer device which can easily eject a case incorporating a recording medium on emergency ejection. CONSTITUTION:When a disk storage case 11 is pushed in, a gear 21 which is held elastically against the energization force of a pull spring 3 and a fixed gear 25 are turned into a state where the engagement is released and a sliding contactor 26c of a lead-in lever 26 is in contact with a cam surface 27 formed on the gear 25 for guiding when leading in the above disk storage case 11, thus allowing the sliding contactor 26c to contact a cam surface 28 and hence rotating the gear 25 itself in the direction of a specific arrow b and completely loading for example the disk storage case 11 being loaded into the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is suitable for use in a recording medium loading mechanism in which the recording medium is inserted or ejected by an electric driving means such as a motor in a driving device for driving the recording medium. Gear transmission device.

[0002]

2. Description of the Related Art A disk-shaped recording medium such as an optical disk is housed in a case such as a cartridge, and the disk-shaped recording medium is mounted in a drive unit body for rotating the recording medium in the case. A device for recording or reproducing is known. Recently, such a drive device detects the insertion of the case and automatically retracts it by the retracting means when the case housing the disc-shaped recording medium is inserted into a predetermined position. This is the so-called power loading pull-in function.

Generally, when such a disc-shaped recording medium is pulled in together with a case, for example, at the time of power loading, the case is pulled in the insertion direction via a gear drive mechanism and automatically loaded into the apparatus. . Specifically, the rack is formed in the case, and when the pinion provided on the drive unit side is engaged with this rack and retracted, the traction force transmitted by the gear drive mechanism is automatically converted into the case insertion direction. Loading into the device is performed.

[0004]

By the way, in the conventional gear drive mechanism, if a power failure or a device failure occurs while the case is being loaded into the device, a new mechanism is not added during insertion. It was impossible to urgently eject the case.

When the above-mentioned emergency eject is performed by a new additional mechanism, the emergency eject mechanism has a meshing state by stopping the drive source by disengaging the first stage gear meshing with the gear attached to the rotary shaft of the drive source. It will be canceled. This makes the case ready for loading. Further, an internal force mechanism for constantly ejecting the tray or the caddy is provided in the apparatus, and after this state is set, the drive apparatus ejects the case during insertion.

However, in the case of performing an emergency eject, the power loading mechanism of the driving device becomes complicated in the mechanism used by adding the above-mentioned conventional gear driving mechanism and a new mechanism. Due to this complication, the operation of the drive device may become complicated.

Further, since the apparatus is previously provided with an internal force mechanism for constantly ejecting the tray or the caddy,
The driving device becomes heavy in operation and becomes a device having poor usability.

Therefore, the present invention has been made in view of the above situation, and an object thereof is to provide a gear transmission device capable of easily ejecting a case containing a recording medium during an emergency eject. .

[0009]

In order to solve the above-mentioned problems, a gear transmission device according to the present invention is a first gear mounted on a rotary shaft of a rotation drive means having a unidirectionality in a rotation direction.
Gear, a second gear that transmits a rotational driving force in accordance with the rotation of the first gear, and a biasing unit that biases the first gear and the second gear in a direction in which they mesh with each other. The biasing means is attached to one end side for rotating the second gear in a direction in which the second gear meshes with the first gear with respect to a fulcrum, and the second gear that freely rotates is attached to the other end side. The rotation lever, the third gear that transmits a traction force to the driven object according to the rotational force from the second gear, and the driven object are pushed in to resist the urging force of the urging means. And a pull-in arm means for pulling the driven object to a predetermined position in response to the rotation of the third gear when the second gear is disengaged from the third gear. One end of the pull-in arm means is brought into sliding contact with the gear to guide the pull-in of the driven object. And a second cam surface for sliding the one end side of the pull-in arm means to regulate the operation of the pull-in arm means and rotating the third gear itself. .

Here, the pull-in arm means is a pull-in lever for pulling in a case accommodating a recording medium in the apparatus.

[0011]

In the gear transmission according to the present invention, the second member is elastically held against the biasing force of the biasing means when the driven object is pushed in.
Of the driven gear is brought into a disengaged state with the fixed third gear, and the driven object is pulled in while one end side of the pull-in arm means is brought into sliding contact with the first cam surface formed on the third gear. By guiding the case and slidingly contacting the second cam surface, the third gear itself is rotated in a predetermined direction to completely load, for example, a storage case in the middle of loading into the apparatus.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gear transmission according to the present invention will be described below with reference to the drawings.

The application of the gear transmission of the present invention to a disk drive will be described. This disk drive device is provided with a so-called power loading mechanism that loads or ejects a storage case in which a recording medium is stored using a motor as a drive source. It is premised that the motor, which is the driving source, rotates only in one direction in either load or eject. In the storage case, for example, when the disc storage case is inserted, the shutter provided in the disc storage case is opened by the shutter opening / closing lever, and the shutter is operated according to the operation of the shutter opening / closing lever in response to the ejection of the disc storage case. A mechanism for automatically closing is provided.

For example, as shown in FIG. 1 when viewed obliquely from above on the back side, a disk storage case 11 containing, for example, an optical disk 10 as a recording medium in the disk drive device.
Has been inserted. The disk storage case 11 shown in FIG. 1 is in a state of being chucked by being inserted up to a position 12 where recording or reproduction is possible.

In the disk drive device, a housing 13 incorporates various mechanisms, a recording section and a reproducing section. An insertion opening for inserting the disk storage case 11 is opened on the front side of the housing 13 in the disk drive device (not shown). The disc storage case 11 has a tray 43, which will be described later, through the insertion opening.
In order to supply the disk storage case 11 with the guide rails 14, the guide rails 14 are provided on both sides of the inner side surface of the housing 13 facing the side surface of the disk storage case 11. Power is loaded to position 12 with the direction of arrow A in FIG. 1 formed on the upper surface side as the traveling direction.

A mechanism for performing power loading will be briefly described. The disk storage case 11 is shown in FIG.
The concave portion 15 formed on the side surface of the disk storage case 11 shown in FIG. 6 is engaged with the hook portion 16 a of the engaging lever 16.
The engagement lever 16 is connected to the pull-in lever 26 via a pin 26 a arranged on one end side of the pull-in lever 26. When the disc storage case 11 is engaged with the engagement lever 16, the changeover switch 18 for switching and controlling the power loading is turned on. When the changeover switch 18 is turned on, the motor 19 starts to rotate in one direction.

A gear 21, which is a spur gear as a first gear and is attached to a pin 20 as a rotation shaft of the motor 19, rotates in the direction of arrow b in FIG. In FIG. 1, in the gear 21, the rotational driving force is transmitted to the gear 22, which is the second gear, in response to this rotation. The spur gear 22 is provided with a gear having a diameter smaller than that of the gear 22 in a two-stage configuration. The gear 22 is arranged on the turning lever 30, as will be described in detail later. The rotary lever 30
The direction in which the fulcrum pin 30c meshes with the gear 20 (see FIG.
A tension spring 31 as a biasing means is arranged on one end side of the arrow a), and the gear 22 is attached to the other end side so as to be rotatable.

While reducing the number of rotations through intermediate reduction gears 23 and 24 of the same two-stage structure as the gear 22,
Depending on the rotational force from the gear 22, the disk storage case 11
The gear 25, which is the third gear that transmits the traction force to, rotates in the direction of arrow b in FIG.

On the upper surface side of the gear 25, a pull-in lever 26 as a pull-in arm means for pulling the disc storage case 11 into a predetermined position 12 according to the rotation of the gear 25 which rotates via a pin 25a is arranged. ing. A cylindrical sliding contact 26c fixed via a pin 26b is arranged on the other end side of the pull-in lever 26. The pull-in lever 26 rotates via the fulcrum pin 26d.

Here, on the upper surface side of the gear 25, a first cam surface 27 for guiding the pulling-in of the disk storage case 11 is formed while slidingly contacting the sliding contact 26c of the pulling-in lever 26, and the pulling-in lever is also formed. A second cam surface 28 for rotating the gear 25 itself by restricting the operation of the pull-in lever 26 while slidingly contacting the sliding contactor 26c of 26 is formed. A cam 29 is formed on the lower surface side of the gear 25 so as to interlock with a lowering mechanism for chucking the disk storage case 11 after reaching the predetermined position 12.

In the gear 25, the cam surface 27 has the pin 2
5a is formed so as to surround the pin 5a, and a half shape of the pin 25a is formed as a "leaf". Further, the cam surface 28 is formed in a substantially “S” -shaped waveform at an outer peripheral position facing the cam surface 27. One surface of the cam surface 28 facing the one "leaf" shape of the cam surface 27 is formed so as to keep a substantially constant interval, and one surface of the cam surface 28 is formed with respect to the other "leaf" shape of the other surface. It has a shape that expands in a “C” shape.

The interval between the cam surface 27 and the cam surface 28 is set so that at least the sliding contactor can abut one of the surfaces and slide.

A torsion coil spring 26e is provided on the fulcrum pin 26d of the pull-in lever 26. The torsion coil spring 26e is biased in the direction of arrow B in FIG. 1 as described later.

Further, as described above, when the disc storage case 11 is inserted, the shutter 40 of the disc storage case 11 contacts the sliding contact 36 on one end side of the shutter opening / closing lever 35. The shutter opening / closing lever 35 is provided with a torsion coil spring 37 on the other end side via a fulcrum pin 35a. This torsion coil spring 3
7 is also the direction in which the disc storage case 11 is ejected (see FIG. 1).
Is urged in the direction of arrow B. Disk storage case 1 overcoming this bias and applying power loading
When 1 is inserted, the sliding contactor 36 contacts the shutter 40 and slides in the direction of arrow C in FIG. 1 to open the shutter 40. Disc storage case 1 at position 12 described above
1 fully opens the shutter 40. At this time, the disk drive device moves the optical head section 41 to a desired address area after raising the built-in spindle motor to a predetermined rotation speed, and then from the shutter opening section 42 to the optical disk 1.
Recording or reproduction is performed by irradiating 0.

The structure of the gear transmission of the present invention applied to the disk drive will be described with reference to the plan view seen from the upper side of FIG. The gear transmission includes a gear 21 attached to the output shaft pin 20 of the motor 19, a gear 22 that transmits a rotational driving force according to the rotation of the gear 21, and a gear 21 that meshes with the gear 21 in an arrow a direction. The tension spring 31 for biasing the tension spring 31 is attached to one end 30a side for rotating the tension spring 31 with respect to the fulcrum pin 30c in the direction in which the gear 22 meshes with the gear 21, and is freely rotated for the other end 30b side. Rotation lever 30 with gear 22 attached
A gear 25 that transmits a traction force to the disc storage case 11 in response to the rotational force from the gear 22, and a gear 25 that pushes the disc storage case 11 and resists the biasing force of the tension spring 31 from the gear 25 to the gear. When the gear 22 is disengaged, it has a retracting lever 26 that retracts the disc storage case 11 to a predetermined position 12 according to the rotation of the gear 25. The gear 25 has a pin as one end of the retracting lever 26. The cam surface 26 that guides the pull-in of the disk storage case 11 is slidably contacted with the side on which 26b is disposed, and the one end side of the pull-in lever 26 is slidably contacted to regulate the operation of the pull-in lever 26. Gear 2 above
A cam surface 27 that rotates 5 itself is formed. Here, each of these parts is arranged on the upper surface 43A side of the tray 43 which receives the disk storage case 11 in the disk drive device.

The tray 43 is a motor 1 shown by a broken line in FIG.
9 is cut out in accordance with the outer shape of 9. The motor 1
9 is covered with a sheet metal 32 formed to have a convex shape. The sheet metal 32 is used for the output shaft pin 20 of the motor 19.
A hole (not shown) for penetrating is formed.
Further, the sheet metal 32 has a fulcrum pin 30c of the turning lever 30.
And a hook-shaped piece 32a for forming a gap so that the rotation lever 30 can be freely rotated. Although not shown, the sheet metal 32 and the motor 19 are fixed by two screws. Then, the sheet metal 32 has screws 33a to 3a.
They are arranged on the upper surface 43A of the tray 43 at four points 3d. In this way, the motor 19 is integrally fixed to the tray 43.

The rotating lever 30 rotates about the fulcrum pin 30c. One end of the tension spring 31 is engaged with the rotating lever 30 on the side of 30a as described above. The other end of the tension spring 31 is engaged with a convex piece 32b in which a part of the sheet metal 32 is vertically bent. Tension spring 3
Reference numeral 1 is a spring such that a biasing force acts in the direction of arrow a. Further, a spur gear 22 is arranged on the 30 b side of the rotating lever 30 at a position where it meshes with the gear 21 via a pin 22 arranged on the rotating lever 30. A gear 22 b, which is smaller than the diameter of the gear 22 shown by a broken line, is disposed between the gear 22 and the rotating lever 30 via a pin 22. The gear 22 and the gear 22b are joined together to form a two-stage structure.

With this structure, the rotating lever 30 causes the gear 21 and the gear 22 to mesh with each other, and the motor 1
In order to transmit the rotation in one direction of 9, for example, the direction of the arrow b, it integrally rotates in the direction of arrow c.

The rotational driving force of the motor 19 is transmitted to the gear 25 via the reduction gears 23 and 24 as gears for reducing the driving rotation. The reduction gears 23 and 24 are also the above-mentioned 2
The reduction gear 23 has a spur gear 23a, and the spur gear 23a of the reduction gear 23 is meshed with the gear 22b.
4b is arranged so as to mesh with the spur gear 25.

On the upper surface 25A of the gear 25, cam surfaces 27 and 28 for contacting the sliding contact 26c of the pull-in lever 26 are formed. The cam surface 27 has the sliding contact 2 as described above.
6c is brought into contact with and slidably contacted along the cam surface, thereby guiding the drawing of the disk storage case 11. Further, the cam surface 28 restricts the operation of the pull-in lever 26 by abutting the sliding contact 26c and slidingly contacting the sliding contact 26c along the cam surface. By providing the restricting cam surface 28, as will be described later, when the power loading is stopped due to, for example, power-off or a failure, the disk storage case 11 is pushed in, so that the gear 22 and the gear 23 mesh with each other in this embodiment. By releasing it, the operation of the gear 25 becomes free, and the direction of the pushing force is converted into the rotational force of the gear 25.

The gear 25 also has a cam (not shown) on the lower surface side.
Are formed. The lever 33 with a sliding contact member that comes into contact with this cam is provided on the intermediate plate while sliding an inclined cam attached to a slide plate that interlocks with the movement of the lever 33 with a sliding contact member over the intermediate plate. Insert it into the opening. As a result, the tray 43 supporting the slide plate is lowered. The disc storage case 11 arranged on the tray 43 is also lowered and properly mounted in the predetermined position 12.

Retractor lever 26 sliding on gear 25
Is provided with a torsion coil spring 26e via a fulcrum pin 26d. The torsion coil spring 26e is locked by an abutment surface 26f bent on the pull-in lever 26 and a convex piece 43a obtained by vertically bending a part of the notch of the tray 43.

A torsion coil spring 37 is also provided on the shutter opening / closing lever 35 through a fulcrum pin 35a. This torsion coil spring 37 is also the pull-in lever 26.
Similarly, one end of the torsion coil spring 37 is locked by the bent contact surface 35b. The other end of the torsion coil spring 37 is brought into contact with and locked by a protruding piece 43b obtained by vertically bending a part of the notch of the tray 43. The other end of the torsion coil spring 37 is bent in a "doglegged" shape after the contact, and the rotation thereof is stopped so that the shutter opening / closing lever 35 does not open the shutter.

The biasing directions of the coil springs 26e and 37 are the directions indicated by the arrow B centering on each fulcrum pin. The torsion coil springs 26e and 37 are urged in a direction to eject the inserted disk storage case 11.

Next, the operation of the gear transmission of the present invention will be described with reference to FIGS. Although the description has been given so far in the state of being arranged in the disk drive device, when only the gear transmission device is extracted, the gear transmission device has the positional relationship shown in FIG. 3 during normal operation as described above. The engagement lever 16 is provided via a pin 26 a provided at the end of the pull-in lever 26.

When the disc storage case 11 is lightly pushed in from the insertion port, the pull-in lever 26 starts moving from the position shown by the alternate long and short dash line in FIG. At this time, the pull-in lever 26 switches the changeover switch 18 shown in FIG. 2 to the switch-on state to start the power loading. The motor 19 is turned on, rotates in only one direction, and transmits the rotational driving force to the gears 21 to 25. The gear 25 slides the pull-in lever 26 according to the rotation of the gear 25 while bringing the sliding contact 26c into contact with the cam surfaces 27 and 28. The motor 19 stops rotating at the same time when the disk storage case 11 is mounted in the predetermined position 12. This state is the position shown by the one-dot chain line in FIG.

Next, at the time of ejection, for example, the motor 19
However, it rotates in the same direction as when it is inserted and transmits the rotational driving force through each gear. The gear 25 to which the rotational force is finally transmitted
Starts to rotate in the same direction from the stop position described above, that is, in the direction of arrow b in FIG. When the gear 25 further rotates, the pull-in lever 26 starts the operation of ejecting the disc storage case 11 while contacting and sliding on the cam surface 27. At this time, the cam on the lower surface side of the gear 25 also moves the slide plate that interlocks so as to raise the disc storage case 11. When the hook 16a of the engagement lever 16 and the recess 15 of the disk storage case 11 are disengaged, the torsion coil springs 26e and 37 eject the hook coil springs in one period.

By the way, during this discharge, a power failure or the like occurs,
If the power loading cannot be performed, it can be dealt with by, for example, opening the mechanical portion, disengaging the intermediate gear, turning the cam wheel of the gear 25 to a predetermined position, and then performing the manual emergency eject mode provided in advance. . However, if a power failure or the like occurs during insertion, it cannot be removed or inserted by the conventional power loading mechanism.

In such a case, when the gear transmission of the present invention is used, the disk storage case 11 is forcibly inserted against the biasing force of the tension spring 31. By this insertion, the engaging lever 16 and the pull-in lever 26 are rotated via the pin 18 that interlocks. The retracting lever 26 also
In response to this rotation, it rotates about the fulcrum pin 26d. At this time, the sliding contactor 26 rotates the gear 25 by controlling the turning force of the pull-in lever 26 by the cam surface 28. In this way, the cam surface 28 corresponds to a surface that converts a linearly applied force into a rotational force. By this rotation, the reduction gears 23 and 24 which are intermediate gears also rotate. The reduction gear 23 is
Even if the rotational force is transmitted to the gear 22, the rotation lever 3
The gear 2 which is elastically supported by the tension spring 31 and is not fixed to rotate in the direction of arrow b.
3 makes the lower gear 22b of the gear 22 contact and separate in the outer peripheral direction indicated by the arrow d. This contact / separation makes it easier to insert the disc storage case 11.

The tray 43 is lowered in accordance with the rotation of the gear 25, and the disc storage case 11 can be inserted to the predetermined position 12 shown in FIG. 1 to enter the play mode. In addition, it is possible to take out by using the emergency eject even after mounting in this way.

Since this operation is premised on rotating in one direction, even if the disc housing case 11 is being ejected, if the gear 25 is rotated by pushing it in, the engagement between the gear 22 and the gear 23 is released. The disc storage case 11 can be moved in the ejection direction.

With the above structure, even if a power failure or a failure occurs during insertion, this gear transmission is used as an intermediate mechanism and a new additional mechanism is designed and arranged in the disk drive. Without doing so, the driven object, for example, the disk storage case can be easily inserted or ejected only by pushing in, and the cost can be reduced.

In this embodiment, two reduction gears are arranged as an intermediate gear between the second gear and the third gear.
The present invention is not limited to this embodiment, and the second gear that is held by the elastic gear and the gear that meshes with the third gear are pushed into the driven object so that the gears are meshed with each other. The same effect can be obtained as long as it is released and the third gear is freely rotated.

[0044]

In the gear transmission according to the present invention, the second gear that is elastically held against the urging force of the urging means when the driven object is pushed in and the third gear that is fixed are provided. In the disengaged state, one end side of the retracting arm means is slidably contacted with the first cam surface formed on the third gear to guide the driven object, and the second cam surface is guided. By sliding the third gear itself in a predetermined direction to completely load the storage case during loading, even if a power failure or a failure occurs during insertion, It can be used as an intermediate mechanism and can easily insert or eject a driven object, such as a disk storage case, simply by pushing in the operation without designing and arranging a new additional mechanism in the disk drive. It can also be reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view of a gear transmission according to the present invention, when applied to a disk drive device, as seen from diagonally above the back side.

FIG. 2 is a plan view of the disk drive device as seen from the upper surface side.

FIG. 3 is a plan view showing a gear transmission device applied to the disk drive device.

FIG. 4 is a diagram illustrating a normal operation of the gear transmission device.

FIG. 5 is a diagram illustrating the operation of the gear transmission when the power loading is stopped in the disk drive device.

[Explanation of symbols]

 10 --- Optical disk 11 --- Disc storage case 12 --- Predetermined position 13 --- Housing 14 ---・ ・ ・ Guide rail 15 ・ ・ ・ ・ ・ ・ Recessed portion 16 ・ ・ ・ ・ ・ ・ Engaging lever 18 ・ ・ ・ ・ ・ ・ Changeover switch 19 ・ ・ ・ ・ ・ ・ Motor 20 ........ Output shaft pins 21, 22, 25, ... Gears 23, 24 ..... Reduction gears 25a, 26b .. -Pins 26d, 30c, 35a ... Support pins 27, 28 ... Cam surface 29 ... ... Cam 30 ... ... Rotating lever 31 ...・ ・ ・ Tension spring 32 ・ ・ ・ ・ ・ ・ Sheet metal 33a to 33d ・ ・ ・ Screw 35 ・ ・ ・ ・ ・ ・ Shutter opening / closing levers 26e, 37 ・... torsion coil spring 40 ........ shutter 41 ........ optical head unit 42 ........ shutter openings 43 ........ tray

Claims (2)

[Claims] 1. A first gear attached to a rotation shaft of a rotation drive means having a unidirectionality in a rotation direction, and a second gear for transmitting a rotation drive force according to the rotation of the first gear.
Gear, a biasing means for biasing the first gear and the second gear in a direction in which they mesh with each other, and the second gear is the first gear with respect to the biasing means.
Attached to one end side to rotate in the direction to mesh with the gear of
A rotating lever to which the second gear that freely rotates is attached to the other end side, a third gear that transmits a traction force to a driven object according to a rotational force from the second gear, and the driven gear. When the driven object is pushed in and the second gear is disengaged from the third gear against the urging force of the urging means, the driven object is moved according to the rotation of the third gear. A retractable arm means for retracting to a predetermined position, and a first cam surface for guiding retracting of the driven object by sliding one end side of the retractable arm means to the third gear, and the retractable means. A gear transmission device comprising a second cam surface for slidingly contacting one end side of the arm means to restrict the operation of the pull-in arm means to rotate the third gear itself. 2. The gear transmission device according to claim 1, wherein the pull-in arm means is a pull-in lever for pulling in a case accommodating a recording medium in the apparatus.