JPH059558Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention uses a rack member provided with a rack by a pinion gear to which the driving force from the motor is transmitted to the transmission gear using a connecting belt. The invention relates to a rack member drive mechanism that protects the components that drive the rack member when an overload occurs on the rack member. (B) Prior Art A rack member drive mechanism is known in which a rack is provided on a member that needs to be moved linearly, and the member is moved linearly by driving the member with a pinion gear to which driving force from a motor is transmitted. ing.
The rack member driving mechanism is used in many optical disc players that optically reproduce signals recorded on a disc using an optical pickup. Such a disc player, as shown in Japanese Patent Application Laid-Open No. 59135651, has a mounting part for placing a disc, a mounting position for mounting and removing the disc protruding from the housing, and a mounting part as described above. A rack is provided on a tray that can be slid horizontally between the center hole of the disk placed on the turntable and the playback preparation position located on the turntable, and the rack is engaged with the rack by operating a switch. Since the tray is configured to slide between the attachment/detachment position and the playback position with a single switch operation by transmitting the driving force from the motor to the pinion gear,
It has excellent operability and a luxurious feel. (c) Problems to be solved by the invention By the way, disk players whose tray protrudes from the housing in the loading/unloading position may be caused by the disc not being set correctly, by the user intentionally applying an overload, or by the fact that there is damage inside the housing. Sliding of the tray to the playback preparation position may be inhibited due to foreign matter being mixed in or the like. In such a case, in a disk player where the tray is automatically slid by a motor drive, the motor acts to forcefully drive the tray, so the parts that make up the drive mechanism for driving the tray, For example, it caused damage to racks and pinion gears, and caused burnout of the motor. In view of the above-mentioned points, the present invention aims to provide a rack member drive mechanism suitable for achieving a tray drive mechanism that solves the drawbacks of the above-described tray drive mechanism of a disk player. (d) Means for solving the problem The present invention includes a rack member provided with a rack,
A pinion gear that meshes with the rack of the rack member, a transmission gear to which the driving force of the motor is transmitted, and a connecting belt that connects the transmission gear and the pinion gear to transmit the rotation of the transmission gear to the pinion gear. a pressing member that presses the connecting belt to eliminate slack in the connecting belt; and a pressing member that presses the connecting belt to eliminate slack in the connecting belt; and a support member that is displaced in the direction of disengaging from and engaging with the rack. (e) Function The present invention is a telescopic system in which the driving force from the motor transmitted to the transmission gear is transmitted to the pinion gear via the connecting belt, which drives the rack member, and which is capable of transmitting a large load as the connecting belt. In a rack member drive mechanism that uses materials with poor properties, if movement of the rack member in a predetermined direction is inhibited, the relationship between the rotational speeds of the transmission gear and pinion gear will collapse, and the rotational speed relationship between the transmission gear and pinion gear of the connecting belt will be Focusing on the fact that the tension on one side increases (the tension on the other side decreases), the tension of the connecting belt causes the pressing member to be displaced against the pressing force, and the supporting member is displaced accordingly. It is designed so that it can be pulled out from the engagement with the rack. (F) Embodiment The figure is a plan view showing an autochanger device that can automatically change the disc to be played in a disc player, which shows an embodiment of the rack member drive mechanism according to the present invention. 4 is a drive mechanism that drives the tray 1 in the horizontal direction; 5 is a drive mechanism that supports the tray 1 and rotates the disk 2; Table (not shown)
This is a clamp plate that can be moved up and down in order to clamp it upward. A rack 6 is formed on one side of the tray 1, and a plurality of trays are stored in a storage section located in the front half of the housing 3 in a multi-tiered manner. The driving mechanism 4 is provided on the substrate 7, and is configured to be raised and lowered by a lifting mechanism (not shown) according to the tray 1 to be driven. By the way, the drive mechanism 4 includes a motor 8 serving as a drive source, and a first motor fixed to a rotating shaft 8a of the motor 8.
A pulley 9, a second pulley 11 to which the rotation of the first pulley 9 is transmitted via a belt 10, a first gear 12 integrally formed on the lower surface of the second pulley 11, and the first gear 12. Second gear 1 that meshes
3, a third gear 14 integrally molded on the upper surface of the second gear 13, a first pinion gear 15 meshing with the third gear 14 and meshing with the rack 6 of the tray 1, and the first pinion A third pulley 16 provided on the upper surface of the gear 15;
The fourth rotation is transmitted through the connecting belt 17.
A pulley 18, a second pinion gear 19 provided on the lower surface of the fourth pulley 18 and meshed with the rack 6 of the tray 1, and a second pinion gear 19 that is rotatable about a support shaft 20a and connected to the A pressing member 2 having a pressing pin 21 that presses the belt 17
0, and a support member 22 which is rotatable about a support shaft 22a and on which the second pinion gear 19 is pivotally supported. The pressing member 20 is urged in the direction of arrow A by the first spring 23, and presses the pressing pin 21 in the direction of arrow A to eliminate slack in the connecting belt 17. Further, the support member 2
2 is urged in the opposite direction of arrow A by a second spring 24 to deepen and securely engage the second pinion gear 19 with the rack 6, and to rotate the pressing member 20 by a connecting shaft 25. possible to be connected. Note that the first and second pinion gears 1
5 and 19 correspond to a transmission gear and a pinion gear, respectively, in the scope of the utility model registration claims. If a desired tray 1 is to be pulled out to the attachment/detachment position from a state in which all the trays 1 are housed in the storage section of the housing 3, an opening/closing switch (not shown) corresponding to the tray 1 to be pulled out is operated. Then, first, the drive mechanism 4 and the clamp plate 5 are raised and lowered in accordance with the tray 1. Therefore, the drive mechanism 4
The second pinion gear 19 is engaged with the rack 6 of the tray 1, and the clamp plate 5 is engaged with the rack 6 of the tray 1.
is displaced to a height that can be supported. Next, the motor 8 starts rotating in the direction of arrow B. The rotation of the motor 8 is sequentially transmitted to the first pulley 9, belt 10, second pulley 11, first gear 12, second gear 13, and third gear 14, and then to the first pinion gear 15. When the motor 8 rotates in the direction of arrow B, the first pinion gear 15 rotates in the direction of arrow C. Further, the rotation of the first pinion gear 15 is controlled by the third pulley 16, the connecting belt 17, and the fourth pinion gear.
The first pinion gear 15 is sequentially transmitted to the pulley 18 and then to the second pinion gear 19.
When the second pinion gear 19 rotates in the direction of arrow C, the second pinion gear 19 rotates in the direction of arrow D. Therefore, the desired tray 1 slides in the direction of arrow E. When the sliding of the tray 1 in the direction of arrow E progresses and the notch 1b of the tray 1 as a whole protrudes forward of the housing 3, the protrusion 26a of the rotary lever 26 biased in the direction of arrow F It is fitted into the groove 1c formed in the tray 1, and the tray 1 is locked and the rotating lever 26 is rotated. Therefore, since the switch 27 is switched, the motor 8
The rotation of the tray 1 is stopped, and the sliding of the tray 1 is stopped. At this time, the tray 1 is at the attachment/detachment position for attaching and detaching the disk 2, and since the notch 1b protrudes forward from the housing 3, the disk 2 can be easily placed on the tray 1. When reproducing the disk 2 placed on the tray 1 in the loading/unloading position, the reproduction operation is performed as is.
Then, the motor 8 starts rotating in the opposite direction of arrow B. Therefore, the second pinion gear 19 rotates in the opposite direction of arrow D. Here, the projection 26a of the rotating lever 26 is fitted into the groove 1c of the tray 1, and the shape of the groove 1c and the projection 26a is such that it locks when the tray 1 is slid in the direction of the arrow E. is engaged, and the lock is released when the tray 1 is slid in the opposite direction of arrow E. Therefore, when the second pinion gear 19 rotates in the opposite direction of arrow D, the tray 1 starts sliding in the opposite direction of arrow E. As the tray 1 continues to slide in the direction opposite to the arrow E and the tray 1 passes the storage section, both sides of the tray 1 are moved by guide members 28 and 29 provided below the sides of the clamp plate 5, respectively. Guided and supported. Further, when the tray 1 slightly exceeds the storage portion, the first pinion gear 15 is engaged with the rear part of the rack 6 of the tray 1. here,
The first pinion gear 15 has the same shape as the second pinion gear 19, and a connecting belt 17 connects the third and fourth pulleys 16 and 18, which have the same shape.
The pinion gear 15 is the second pinion gear 19
The tray 1 is slid in the same direction and at the same speed. Therefore, the first pinion gear 15 meshes smoothly with the rack 6 of the tray 1. Then, the rack 6 and the second pinion gear 19 are disengaged, but after that, the first pinion gear 15 moves the tray 1 toward the arrow E.
continues sliding in the opposite direction. Tray 1 continues to slide in the opposite direction of arrow E,
The center hole 2a of the disk 2 placed on the tray 1
When the tray 1 reaches the regeneration preparation position facing the chucking member 30 of the clamp plate 5, the switch 31 attached to the clamp plate 5 is switched by the rear surface of the tray 1, the rotation of the motor 8 is stopped, and the rotation of the motor 8 is stopped. The horizontal sliding of tray 1 is completed. Thereafter, the tray 1 is lowered together with the clamp plate 5, and the notch 1b of the tray 1 is lowered.
The disc 2 is mounted on a turntable (not shown) via the disc 2, and the disc 2 is in a playback state. By the way, while the tray 1 is being slid from the loading/unloading position to the playback preparation position, for some reason such as the disk 2 not being set correctly on the tray 1 or foreign matter getting into the housing 3, the tray 1
If the sliding of the tray 1 is inhibited while the second pinion gear 19 is engaged with the rack 6 of the tray 1 (there is a high possibility that the sliding of the tray 1 will be inhibited in this state), the rack 6 of the tray 1 Rotation of the second pinion gear 19 is inhibited due to the meshing with the second pinion gear 19. Therefore, the second
The rotational speed of pinion gear 19 is slower than the rotational speed of first pinion gear 15. Here, the connecting belt 17 is made of a material with poor elasticity, and a tooth row is formed on the connecting belt 17.
The fourth pulleys 16 and 18 are formed with tooth rows that engage with the tooth rows of the connecting belt 17.
Therefore, when a rotation difference occurs between the first pinion gear 15 and the second pinion gear 19, the tension on one side of the connecting belt 17 between the third and fourth pulleys 16 and 18, which is in contact with the pressing pin 21, is increased. increases, and a force that presses the pressing pin 21 in the opposite direction of arrow A is generated. Therefore, the second pinion gear 19
becomes slower than the rotation speed of the first pinion gear 15 by a predetermined value or more, and the force in the opposite direction of arrow A generated by the tension on one side of the connecting belt 17 causes the pressing pin 21 to move in the direction of arrow A. When the pushing force increases, the pressing member 20 rotates in the opposite direction of the arrow A by the displacement of the connecting belt 17 in the opposite direction of the arrow A, about the support shaft 20a. When the pressing member 20 rotates about the support shaft 20a in the opposite direction of the arrow A, the connecting shaft 25 is slightly displaced in the opposite direction of the arrow A in accordance with the rotation of the pressing member 20. Therefore, the support member 22 rotates around the support shaft 22a, and the second pinion gear 19 located on the opposite side of the connection shaft 25 with the support shaft 22a in between is displaced in the direction of arrow A. Here, since the distance from the support shaft 22a to the axis of the second pinion gear 19 is about three times the distance from the support shaft 22a to the connection shaft 25, the connection shaft 25 is directed in the opposite direction of arrow A. Due to the small displacement of the second pinion gear 19, the meshing of the second pinion gear 19 with the rack 6 becomes shallow, and the second pinion gear 19 is almost pulled out. For that reason,
This prevents the second pinion gear 19 from spinning idly and damaging the components of the drive mechanism 4. If the cause of obstructing the sliding of the tray 1 is removed, the tension on one side of the connecting belt 17 between the third and fourth pulleys 16 and 18, which is in contact with the pressing pin 21, will be reduced, and the The pressing force applied to the pressing pin 21 by the first and second springs 23 and 24 causes the pressing pin 21 to press the connecting belt 17 and to be displaced in the direction of arrow A. For that reason,
Since the second pinion gear 19 is displaced in the opposite direction of the arrow A, the meshing of the second pinion gear 19 with the rack 6 becomes deeper, and the tray 1 is again driven by the second pinion gear 19. In the above-mentioned embodiment, since it is necessary to increase the sliding distance of the tray 1, the tray 1 is driven by the first and second pinion gears 15 and 19, but the sliding distance of the tray 1 is short. If this is acceptable, the tray 1 may be driven only by the second pinion gear 19. (g) Effects of the invention As described above, according to the invention, when the pinion gear is engaged with the rack of the rack member and the displacement of the rack member in a predetermined direction is inhibited, the transmission gear of the connecting belt By increasing the tension on one side between the pinion gear and the pinion gear, the pressing member is displaced against the pressing force and the supporting member is displaced, so that the pinion gear engages with the rack in the direction of disengagement. Therefore, it is possible to provide a rack member drive mechanism that can prevent damage to component parts.

[Brief explanation of the drawing]

The figure is a plan view showing an autochanger device for a disc player, which is an embodiment of the present invention. Explanation of main drawing numbers, 1... Tray, 4 ... Drive mechanism, 5... Clamp plate, 8... Motor, 15...
First pinion gear, 17... Connection belt, 19...
...Second pinion gear, 20...Press member, 22...
...Supporting member, 25...Connection shaft.

Claims (1)

[Scope of utility model registration request] A rack member provided with a rack, a pinion gear meshing with the rack of the rack member, a transmission gear to which the driving force of the motor is transmitted, and a transmission gear for transmitting the rotation of the transmission gear to the pinion gear. a connecting belt that connects the pinion gear; a pressing member that presses the connecting belt to eliminate slack in the connecting belt; and the pinion gear is pivotally supported and the pressing member resists the pressing force. and a supporting member that is displaced in a direction in which the pinion gear is disengaged from the rack when the pinion gear is displaced, and when movement of the rack member in a predetermined direction is inhibited, the tension of the connecting belt is applied to the pressing member. A rack member drive mechanism characterized in that the support member is displaced in a direction in which a pinion gear is brought out of engagement with the rack by displacing the support member against a pressing force.