JPH10136670A - Device using motor - Google Patents

Abstract

(57) [Problem] When a motor is fixed to an apparatus main body, unnecessary stress acts on the motor when the processing accuracy of the apparatus main body is low. SOLUTION: In a motor-using device in which a motor 10 is attached to device main bodies 1, 2, motor housings 13, 14 are provided.
However, with respect to the apparatus main body, displacement in a direction in which the motor rotation axis is inclined is allowed, and displacement in a direction in which the motor rotation axis rotates around the motor rotation axis is restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a motor on an apparatus body.

[0002]

2. Description of the Related Art An apparatus such as a copying machine is provided with a motor for driving a photosensitive drum and the like. When a high level is required for the rotation accuracy of the motor and the installation accuracy of the rotating shaft, for example, a motor mounting structure as shown in FIG. 4 is employed.

In FIG. 4, reference numeral 53 denotes a flat base constituting the apparatus main body, and reference numeral 54 denotes a motor mount fixed outside the base 53 by screws 55.

A housing boss of a motor 60 is fitted to the motor mounting base 54, and a housing flange is formed of a screw 58.
Has been fixed by. Note that the motor 60 is a so-called vibration type motor, and a stator (vibration body) 61 whose vibration is excited by an electro-mechanical energy conversion element;
And a rotor (contact body) 62 which is brought into pressure contact with the stator 61 and is rotationally driven by the vibration of the stator 61.

A rotor 62 is connected to a motor output shaft 51 so as to be integrally rotatable.
It protrudes inside the base 53 through the inside. The output shaft 51 is rotatably held by a bearing 59 pressed into the base 53. An involute spline 52 is cut at the end of the output shaft 51, and is directly engaged with a driven body (photosensitive drum or the like) 71.

[0006]

However, in the above-described motor mounting structure, if the parallelism between the base 53 and the motor mounting surface of the motor mounting base 54 fixed to the base 53 is not strictly guaranteed, even if the ball is mounted, Even if the accuracy of the facing position between the inner ring of the bearing 59 and the fitting hole of the boss portion 57 formed on the motor mount 54 is guaranteed, the output shaft 5
1 and the mounting surface of the motor housing to the motor mounting base 54 are not secured at a right angle, the output shaft 51 is microscopically bent, and the internal structure of the motor is rotated under the stress. Will do. This poses a serious problem particularly when the motor mount 54 is formed by press bending in which it is difficult to guarantee processing accuracy of a certain level or more.

[0007] If unnecessary stress is generated in the motor, it causes rotation unevenness (wow and flutter) of the output shaft 51, and the rotation accuracy of the output shaft 51 and thus the driven member 71 cannot be improved. .

Moreover, in a vibration type motor in which the stator 61 and the rotor 62 come into contact with uniform contact pressure to achieve smooth rotation, unnecessary stress is generated in the motor, so that the contact pressure becomes non-uniform. There is a possibility that uneven rotation occurs within one rotation cycle. further,
When the pressing force between the stator 61 and the rotor 62 becomes non-uniform, the contact surfaces of the two may be abnormally worn, which may shorten the life of the motor.

Incidentally, it is possible to produce a motor mounting base 54 having a predetermined dimensional accuracy by performing secondary processing such as milling on a frame made of aluminum die-cast.
However, in this case, there is a problem that the manufacturing cost of the motor mount 54 is significantly increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor using device which can guarantee the rotation accuracy and life of the motor without applying unnecessary stress to the output shaft and the internal structure of the motor and can be manufactured at low cost. .

[0011]

In order to achieve the above object, according to the present invention, in a motor-using apparatus in which a motor is mounted on an apparatus main body, a motor housing has a motor rotating shaft with respect to the apparatus main body. The displacement in the tilting direction is allowed, and the displacement in the direction rotating around the motor rotation axis is restricted.

That is, even if the parallelism between the motor mounting base and the base that constitutes the apparatus main body is not ensured, the motor housing is moved relative to the apparatus main body in accordance with the direction of the motor output shaft held by these. By displacing (tilting), unnecessary stress is not applied to the motor output shaft and the internal structure of the motor, and by controlling the rotational displacement of the motor housing, the driven member can be reliably driven. I have to.

More specifically, the motor housing is held by the apparatus main body so as to be displaceable in the tilting direction and the rotating direction, and the apparatus main body is engaged with the motor housing to regulate the rotational displacement of the housing. What is necessary is just to provide a rotation control means. Also,
The motor output shaft is held by the apparatus main body so that the motor housing is not held with respect to the apparatus main body, and the apparatus main body is engaged with the motor housing to regulate the displacement of the housing in the rotating direction. A rotation regulating means may be provided.

In the present invention, by applying such a structure to an apparatus using a vibration type motor, uneven rotation and abnormal wear of the vibration type motor are prevented.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a motor peripheral portion of a motor using apparatus according to a first embodiment of the present invention. In this figure, reference numeral 6 denotes a side plate constituting a part of the housing of the apparatus main body, and the base 1 serving as a base is attached to the side plate 6. Reference numeral 2 denotes a motor mount fixed outside the base 1 with screws 3.

Reference numeral 10 denotes a motor, and the housing of the motor comprises a lower case 13 and an upper case 14. A boss 13a is formed at the center of the lower case 13,
A ball bearing 15 is held inside the boss 13a. A ball bearing 16 is also held on the inner periphery of the upper case 14, and the output shaft 11 is rotatably supported by the ball bearings 15, 16.

Reference numeral 17 denotes a disk shrink-fitted on the output shaft 11, and a circular leaf spring 18 is attached to the disk 17. Reference numeral 19 denotes an annular rotor (contact body), which is fixed to the leaf spring 18.

Reference numeral 20 denotes an annular stator (vibrating body) made of an elastic material, and an electromechanical energy conversion element 21 is fixed on the surface thereof. The rotor 19 is pressed against the stator 20 by the leaf spring 18. In the motor 10, a bending traveling wave is generated in the stator 20 by applying a voltage to the electro-mechanical conversion energy element 21, and the rotor 19 pressed against the bending wave is frictionally driven.
The output shaft 11 is driven to rotate. An involute spline 12 is cut at the end of the output shaft 11, and the spline 12 and a driven body (photosensitive drum or the like) 41 are engaged. Therefore, when the motor 10 rotates, the driven body 41 is rotationally driven.

Reference numeral 22 denotes a disk having a number of radial slits attached to the end of the output shaft 11, and reference numeral 23 denotes a photo sensor, both of which constitute an encoder. 2
4 is a cover for protecting the encoder unit.

The motor 10 constructed as described above has the output shaft 11 on which the E-shaped retaining ring 25 is locked in advance, the ball bearing 5 held on the boss hole 2 b of the motor mounting base 2, the base 1 and the side plate 6. After passing through the inside of the boss portion 13a, the boss portion 13a is fitted into the boss hole 2b. The boss 13a and the boss hole 2b
The degree of fitting is loose enough that the motor housing can be displaced in the direction in which the motor rotation shaft (the axis of the output shaft) is inclined. Then, the E-shaped retaining ring 26 is locked at a position sandwiching the ball bearing 5 between the output shaft 11 and the retaining ring 25E, and the axial position of the motor 10 is regulated.

Here, the base 1 and the motor mount 2 are both formed by pressing a steel plate. Motor mount 2 is 2
However, since the machining accuracy is not so high, the reference surface 1a of the base 1 and the motor mounting base 2 are formed.
The degree of parallelism with the motor mounting surface 2a is not accurate, and an inclination of about 0.2 ° to 0.5 ° usually occurs. Therefore, the inner ring of the ball bearing 25 and the boss hole 2 of the motor mounting base 2 are formed.
If the precision of the facing position with respect to b is good, the motor mounting surface 2a and the lower case 13 of the motor 10 will not be parallel.

However, in this embodiment, the motor housing (the lower case 13 and the upper case 14) can be inclined with respect to the motor mounting surface 2a in accordance with the direction of the output shaft 11 held by the ball bearing 25. , The output shaft 11 itself and the internal structure of the motor 10 (the stator 20 and the rotor 19).
Unnecessary stress does not act on For this reason,
Uneven rotation of the motor 10 and abnormal wear of the stator 20 and the rotor 19 can be prevented, and the rotation accuracy of the motor 10 can be increased and the life can be extended.

On the other hand, reference numeral 27 denotes a step screw (rotation restricting means referred to in the claims) mounted near the outer periphery of the motor mount 2. An elongated hole 13b extending in the radial direction of the motor is provided in a flange portion of the lower case 13 of the motor 10 as shown in FIG.
The stepped screw 27 is inserted into and engaged with the elongated hole 13b. Thus, the rotational displacement of the motor housing with respect to the motor mounting base 2 around the motor rotation axis is regulated, and the driven body 41 can be reliably driven to rotate by the motor 10.

(Second Embodiment) FIG. 3 shows a motor peripheral portion in a motor using apparatus according to a second embodiment of the present invention. In addition, since this embodiment has many parts common to the first embodiment, common elements are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

In the first embodiment, the motor housing (13, 1
4) is described as being fitted and held in the boss hole 2b of the motor mount 2, but in this embodiment, the motor housing (13 ', 14') is not held with respect to the motor mount 2 '. It has become. That is, the motor 1 of the present embodiment
Reference numeral 0 'is floatingly supported on the motor mount 2' by supporting the output shaft 11 'by the ball bearings 5, 7.

The ball bearing 7 is press-fitted into a hole formed in the motor mount 2 '. Motor 1 of the present embodiment
In the position 0 ', the output shaft 11' is passed through the inside of the ball bearings 7, 5 and the E-shaped retaining rings 8, 9 are locked to the output shaft 11 ', whereby the axial position is regulated.

Also in this embodiment, the base 1 and the motor mount 2 'are both formed by pressing a steel plate, and the reference surface 1a of the base 1 and the motor mount 2
The degree of parallelism with a ′ is not accurate and is usually 0.2 ° to 0.5
A degree of inclination occurs. For this reason, if the facing position accuracy of the inner rings of the ball bearings 5 and 7 is good, the motor mounting surface 2
a 'and the lower case 13' of the motor 10 'are not parallel.

However, also in this embodiment, the motor housing (the lower case 13 'and the upper case 14') is aligned with the motor mounting surface 2a 'according to the direction of the output shaft 11' held by the ball bearings 5, 7. The output shaft 11 ′ itself and the internal structure of the motor 10 ′ (stator 2).
Unnecessary stress does not act on the rotor 0 or the rotor 19). For this reason, it is possible to prevent uneven rotation of the motor 10 ′ and abnormal wear of the stator 20 and the rotor 19, thereby improving the rotation accuracy of the motor 10 ′ and extending the life. it can.

Reference numeral 27 'denotes a step screw mounted near the outer periphery of the motor mounting base 2' (rotation restricting means referred to in the claims).
It is. In the flange portion of the lower case 13 'of the motor 10', a slot 1 similar to that described with reference to FIG.
3b 'is formed, and a step screw 27' is inserted into and engaged with the elongated hole 13b '. Accordingly, the rotational displacement of the motor housing around the motor rotation axis with respect to the motor mounting base 2 ′ is restricted, and the driven body 41 can be reliably driven to rotate by the motor 10 ′.

In each of the above embodiments, the driven member 4
Although a photosensitive drum of a copying machine is exemplified as 1, the motor-using device of the present invention is not limited to a copying machine.

In each of the above embodiments, the case where a vibration type motor is used as the motor has been described. However, the present invention can be applied to an apparatus using a motor other than the vibration type motor.

[0032]

As described above, according to the present invention, when the parallelism between the apparatus main body and the motor housing is not ensured, the motor is adjusted to the direction of the motor output shaft held by the apparatus main body. Since the housing can be displaced (tilted) with respect to the apparatus main body, unnecessary stress can be prevented from acting on the motor output shaft and the internal structure of the motor, and the rotation accuracy of the motor can be improved. be able to. In addition, since the apparatus main body can be formed by press molding with low processing accuracy but high processing cost, the cost of the entire motor-using apparatus can be reduced.

When the present invention is applied to a vibration type motor, occurrence of abnormal wear of the vibration body and the contact body can be prevented, and the life of the vibration type motor can be extended.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a motor using device according to a first embodiment of the present invention.

FIG. 2 is a partial plan view of the motor using device.

FIG. 3 is a partial sectional view of a motor using device according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a conventional motor using device.

[Explanation of symbols]

 1,53 base 2,2 ', 54 motor mount 5,7,59 ball bearing 11,11', 51 motor output shaft 13,14,13 ', 14' motor housing 27,27 'step screw

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // H02K 7/14 H02K 7/14 C

Claims (4)

[Claims] 1. A motor-using device having a motor mounted on an apparatus main body, wherein the housing of the motor is allowed to displace in a direction in which a motor rotation axis is inclined with respect to the apparatus main body, and is rotated around the motor rotation axis. A motor use device characterized in that displacement in a rotating direction is regulated. 2. A housing of the motor is held by the apparatus main body so as to be displaceable in the tilting direction and the rotating direction, and the motor main body is engaged with the housing to rotate the housing. The motor use device according to claim 1, further comprising a rotation restricting unit that restricts displacement in the direction. 3. An output shaft of the motor is held by the device main body, and a housing of the motor is in a non-holding state with respect to the device main body. 2. The motor using apparatus according to claim 1, further comprising a rotation restricting means for restricting a displacement of the lever casing in the rotating direction. 4. The motor according to claim 1, wherein the motor is a vibration type motor that relatively moves a vibrating body that vibrates by electro-mechanical energy conversion and a contact body that comes into contact with the vibrating body. A motor-using device according to claim 1.