JPH0142839Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a rack-and-pinion disk loading mechanism, and is particularly intended to prevent the locking phenomenon of the rack drive unit.

Prior Art and Problems As shown in Fig. 1, horizontal loading type compact disc players and analog record players are equipped with a disc 1, loaded into the player body 2, and then loaded into the player body 2. It has a disk mounting section 3 for discharging the disk. Reference numeral 4 indicates various operation buttons.

The disk loading mechanism drives the disk mounting section 3 by a motor, and the present inventors previously proposed the structure shown in FIG. 2. The details of this mechanism are shown in Utility Application No. 58-118546, but to give an overview, the disk mounting section (upper drawer)
A movable support part (lower drawer) 5 is provided below the main body 2, and the movable support part 5 is slidably supported by a first sliding shaft 6 in the main body 2. A second sliding shaft (described later) is provided to slidably support the upper drawer 3, and this two-stage structure reduces the overall depth. That is, the racks 7 and 8 are fixed to the sides of the drawers 3 and 5, and the worm gear 10 is provided on the output shaft of the drive motor 9, and the rotation is transmitted to the upper side through the helical gear 11, reversing gear 12, and pinion 13. Rack 7
At the same time, it is also transmitted to the lower rack 8 via the helical gear 14 and pinion 15.

As a result, when the motor 9 is rotated, the drawers 3 and 5
move in the same direction, but if the reduction ratio is set so that the amount of movement of the upper drawer 3 is large, while the lower drawer 5 moves on the sliding shaft 6, the upper drawer 3 moves in the same direction.
moves beyond that range. Therefore, when the rear end of the lower drawer 5 moves to the front end of the sliding shaft 6, the rear end of the upper drawer 3 moves to the front end of the sliding shaft (not shown) of the lower drawer 5. It is possible to set it to , and thereby the discharge state shown in FIG. 1 is obtained. Furthermore, when the rear end of the lower drawer 5 is retracted to the rear end of the sliding shaft 6, if the rear end of the upper drawer 3 is retracted to the rear end of the lower drawer 5, it will not slide with the lower drawer 5. Both the moving shaft 6 and the upper drawer 3
Since it is located below the drawer, the depth dimension of the main body 1 required for storing the drawer (during performance) can be shortened.

In this case, the stopping positions of the drawers 3 and 5 during storage as well as during ejection must be accurate in relation to the turntable (not shown) in the main body 2.
For this reason, conventionally, as shown in Fig. 4, the stopper 2
1 and 22 are provided in the main body, and thereby the drawer 3,
5 is prevented from overrun. After the drawers 3 and 5 collide with the stoppers 21 and 22, the driving force of the motor 9 is no longer required, so the motor stop switch 23, which is also provided inside the main body, is operated by the screws, etc. provided on the lower drawer 5. It is turned on in section 24. The motor 9 is controlled by a control section (not shown), and the switch 23 cuts off the power to the motor 9 when the switch 23 switches from off to on. The motor is reenergized by turning on, for example, the discharge switch of the operation switches 4 shown in FIG. 1, but in this case, the direction of energization is reversed to reverse the rotation.

Incidentally, in the above-described disk loading mechanism, even after the power supply to the motor 9 is stopped, the rotor, and hence the worm 10, tends to rotate due to inertia.
However, since the mechanical stoppers 21 and 22 are provided, the helical gears 11 and 14 and the following are in a non-movable state. Therefore, the rotational force of the rotor acts as a force that causes the worm 10 to bite into the stopped helical gears 11 and 14, and in the worst case, a lock phenomenon occurs that makes it impossible for the motor 9 to reverse rotation.
Such a locking phenomenon is unlikely to occur in home use where the installation and driving conditions are stable, but it is more likely to occur in in-vehicle use where the installation angle of the player body and power supply voltage fluctuate.

Purpose of the invention The present invention has a movable structure that allows the rack to move back slightly relative to the drawer, and provides a bias between the two by spring force, which absorbs the inertia force of the rotor when the drawer moves back. This is what I am trying to do.

Structure of the invention The present invention is a disk loading mechanism in which a drawer carrying a disk and moving is driven from a motor as a drive source through a worm gear, a helical gear, a pinion gear, and a rack, in which the rack is movable relative to the drawer. At the same time, the drawer is normally biased by a spring force so that it operates integrally with the rack, and the spring force is set to absorb the rotational force of the motor after the drawer is mechanically stopped. This will be described in detail below with reference to the illustrated embodiments.

Embodiment of the invention Figure 3 is a side view showing an embodiment of the invention.
5 is the chassis of the player body 2, and 6 is the aforementioned first sliding shaft provided there. This sliding shaft 6
is fixed between the support parts 26 and 22, and these support parts 26 and 22 serve as front and rear stoppers that restrict the movable range of the lower drawer (movable support part) 5. 27,
Reference numeral 28 denotes a bearing made of oilless metal or the like provided on the sliding surface of the drawer 5, and is in sliding contact with the sliding shaft 6. Reference numeral 30 denotes a second sliding shaft provided on the drawer 5, and is fixed between the stopper supporting parts 21 and 29. 3
Bearings 1 and 32 are provided on the sliding surface of the upper drawer (disk mounting portion) 3 and come into sliding contact with the sliding shaft 30. The configuration up to this point is the same as that shown in FIG. 2, and the racks 7 and 8 mesh with pinions 13 and 15, respectively.

In the example shown in Fig. 3, the racks 7 and 8 are not fixed to the drawers 3 and 5, but instead the racks 7 and 8 have two elongated holes 4 each.
0 is provided, and a pin (or screw) 41 protruding from the rack side is inserted into each to hold the rack so that it can move only in the direction of movement of the rack. Contractible springs 42, 43 are stretched between the racks 7, 8 and the drawers 3, 5 so as to apply a bias force in the direction (direction).

With such a movable structure, the drawers 3 and 5 collide with the stoppers 21 and 22 and stop, as shown in FIG. 5, and the switch 23 is energized and the power to the motor 9 is cut off. After that, even if the rotor of the motor 9 rotates due to inertia, the racks 7 and 8 are held in place by the springs 42,
43, the helical gears 11 and 14 can rotate accordingly. Therefore, spring 4
If the constants 2 and 43 are set to values sufficient to absorb the inertial force of the rotor, the racks 7 and 8 can be stopped at positions where the left end of the elongated hole 40 does not abut the pin 41.
In this state, the helical gears 11 and 14 and the worm 1
No bite occurs between 0 and 0. Also, even if there is some biting, the worst lock phenomenon can be avoided. Note that the spring constant must be set so that the right end of the elongated hole 40 always abuts the pin 41 in the normal movement range. The present invention can also be applied to a loading mechanism using only an upper drawer.

Effects of the invention As described above, according to the invention, the rack-and-pinion disk loading mechanism can prevent biting between the worm that transmits the motor output and the helical gear. It is suitable for application to in-vehicle players where conditions vary.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a horizontal loading type player, Fig. 2 is a perspective view showing an example of a rack-and-pinion disc loading mechanism,
FIG. 3 is a side view showing an embodiment of the present invention, and FIGS. 4 and 5 are explanatory views of the operations of FIGS. 2 and 3, respectively. In the figure, 1 is the disk, 2 is the player body, 3,
5 is a drawer, 6, 30 are sliding shafts, 7, 8 are racks, 9 is a motor, 10 is a worm gear, 11, 1
4 is a helical gear, 13, 15 is a pinion, 21,
22 is a drawer stopper, 40 is an elongated hole, 41 is a pin, and 42 and 43 are springs.

Claims (1)

[Scope of utility model registration request] In a disk loading mechanism in which a moving drawer carrying a disk is driven from a motor serving as a drive source through a worm gear, a helical gear, a pinion gear, and a rack, the rack is movably attached to the drawer and is normally attached to the drawer. A bias is applied by a spring force so that the drawer operates integrally with the rack, and the rotation force of the motor after the drawer is mechanically stopped is set to be absorbed by the spring force. Disc loading mechanism.