JPS5989829A - Coupling device - Google Patents

Abstract

PURPOSE:To rotate a motor smoothly and prevent the decline in its output by fixing separate coupling members to a motor output shaft and a rotary shaft, loosely fitting projections provided on one of the both coupling members into recesses provided on the other, and absorbing any shift between said output shaft and the rotary shaft. CONSTITUTION:Coupling members 13, 12 are fixed to the output shaft 4a of a motor 4 and a rotary shaft 5 respectively. Recesses 12a, 12a are provided on the both sides of one end of the coupling member 12, and projections 13a, 13a, which are narrower than the width of the recesses 12a, 12a, are provided on the outer surface of the other coupling member 13. Since these projections are loosely fitted into the recesses 12a, 12a, with some gaps, the vibration or shift of the output shaft 4a of the motor 4 can be absorbed by these gaps between the projections 13a, 13a and the recesses 12a, 12a, thereby securely transmitting the rotation of the motor 4 to a feed screw 5, without causing decline in output.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a coupling device for coupling an output shaft and a rotating shaft of a coaxially arranged motor. It is something.

Structure of a conventional example and its problems FIG. 1 shows a digital audio disc player using a conventional coupling device. In Fig. 1, 1 is a base;
Reference numerals 2 and 3 refer to walls provided in parallel at two locations on the base 1, 4 a feed motor fixed to one end of the base 1, 4a its output shaft, and 6 a bearing with both ends of the walls 2 and 3 (Fig. 6 is a connecting member that connects the output shaft 4a of the motor 4 and one end of the feed screw 6; T is the wall 2, 3;
A guide shaft 8 disposed parallel to the feed screw 6 in between has an optical pickup 9 in the center, has a pin 1o at one end to be inserted into the thread groove of the feed screw 6, and has a feed shinshiro and a guide shaft at both ends. It is a movable body that is movably inserted into the shaft 7.

In the above configuration, the motor 4 is rotated in accordance with the rotation of the disk, and rotates the feed screw 5 via the connecting member 6. As a result, the movable body 8 is moved linearly in the axial direction of the feed screw 5 while the pin 1o is guided by the thread groove of the feed screw 5, and the optical pickup 9 is moved in the radial direction of the disk to optically pick up information on the disk. Read it accurately.

As shown in FIG. 2, the connecting member 6 is made of a cylindrical resin with several slits 6a alternately provided on the outer periphery and flexible in the direction of force indicated by the arrow AB by opening and closing the slits 6a. has been done.

If such a connecting member e is used, it is possible to absorb the vibration of the output shaft 4a of the motor 4 to some extent as shown in FIG. 3(-), but it is inevitable that the output of the motor 4 will decrease. . In addition, misalignment between the output shaft 4a of the motor 4 and the feed screw 5 as shown in FIG. 3(b) cannot essentially be absorbed, and even in this case, a decrease in the output of the motor 4 can be avoided. I couldn't.

OBJECTS OF THE INVENTION The present invention solves these conventional problems, and aims to provide a coupling device that does not reduce the output between the output shaft of the motor and the rotating shaft.

Structure of the Invention The present invention fixes separate connecting members to the output shaft and rotating shaft of a motor, and loosely fits a protrusion provided on one of the two coupling members into a recess provided on the other, thereby reducing the gap between the protrusion and the recess. The gap absorbs the misalignment between the output shaft of the motor and the rotating shaft, allowing the motor to rotate smoothly and preventing the output from decreasing.

DESCRIPTION OF EMBODIMENTS FIGS. 4 and 6 show an embodiment of the present invention.
Components having substantially the same functions as those in FIG. 1 are denoted by the same reference numerals, and explanations thereof will be omitted. Reference numeral 011 designates a bearing for rotatably holding one end of the feed screw 5. Reference numeral 12 and 13 denote a connecting member press-fitted between one end of the feed screw 5 and the output shaft 4a of the motor 4, and one connecting member 12 has recesses 12a on both sides of the one end.

12a, and a protrusion 13a on the outer periphery of the other connecting member 13, which is narrower than the width of the recesses 12a, 12a.

13a is provided. and - the protrusion 13a.

13a is loosely fitted into the recesses 12a, 12a with a certain amount of clearance.

In this way, the deflection or displacement of the output shaft 4a of the motor 4 as shown in FIGS. 3(a) and 3(b) can be prevented by the protrusion 13a.
, 13a and the recesses 12a, 12a.
The rotation of the motor 4 can be reliably transmitted to the feed screw 5 without reducing the output.

The connecting members 12 and 13 may be made of any material that is resistant to twisting, such as resin or metal. Furthermore, the shapes of the protrusions and recesses are not limited to the shapes of the above embodiments, and a recess may be provided in the example of the connecting member 13 and a protrusion may be provided on the side of the connecting member 12. Furthermore, in the embodiment, the feed screw was explained as being driven by a motor, but any shaft that rotates may be used.

Effects of the Invention In the present invention, a connecting member is fixed to each of the output shaft and rotating shaft of the motor, and the protrusion provided on one connecting member is loosely fitted into the recess provided on the other connecting member. ,
The gap between the protrusion and the recess absorbs vibrations of the motor's output shaft and misalignment between the output shaft and the rotating shaft, and the rotation of the motor can be reliably transmitted to the rotating shaft without reducing the motor's output. .

[Brief explanation of the drawing]

Fig. 1 is a plan view of a digital audio disc player using a conventional coupling device, Fig. 2 is a perspective view showing the coupling member, Fig. 3 is a side view for explaining its operation, Figs. FIG. 6 is a sectional view and an exploded perspective view showing essential parts of an embodiment of the present invention. 4... Motor, 4a... Output shaft, 6...
... ]・Feed screw (rotating shaft), 12.13...
- Connecting member, 12a... recess, 13a...
··protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 2 Figure 6'cL Figure 3

Claims (1)

[Claims] At one end of the rotating shaft and at the output shaft of the motor disposed approximately coaxially with this rotating shaft, the first. The second connecting member is fixed, a protrusion provided on one of the connecting members is loosely fitted into a recess provided in the other connecting member, and the rotation of the output shaft of the motor is controlled by the first connecting member. A coupling device configured to transmit information to the feed screw via a second coupling member.