JPH08277844A - Bearing device for rotor - Google Patents

Abstract

PURPOSE: To prevent the increase of a running cost and the waste of resources and cope with the wear of a bearing even at the time of being unprovided with a spare bearing. CONSTITUTION: A bearing 30 is formed of a fit-in part 30a and a collar part 30b and has a bearing hole 30d at the center. The fit-in part 30a is formed into oval shape. In the collar part 30b, both diametral sides of the periphery are cut out one or two to form display parts 30c. The fit-in part 30a is fitted into the fitting hole of a supporting member removably between two rotating positions, and the rotating position of the fit-in part 30a fitted in at present is displayed by the display part 30c. When the bearing hole 30d of the bearing 30 wears with the lapse of time, the fit-in part 30a is removed from the fitting hole, and the bearing 30 is rotated by 180 deg. while looking at the display part 30c so as to be shifted into another rotating position from the rotating position fitted in up to the present. The fit-in part 30a is then fitted again into the fitting hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rollers used in, for example, copying machines, printers, facsimiles, printing machines, and the like.
The present invention relates to a bearing device for a rotating body such as rollers, pulleys, and gears.

[0002]

2. Description of the Related Art Conventionally, for example, in a roller bearing device, as shown in FIG. 7, support members 1 and 2 having mounting holes are provided.
Are opposed to each other, and the shaft 3a of the roller 3 is rotatably supported by the support members 1 and 2 via a bearing 4.

By the way, in such a bearing device for the roller 3, as shown in FIG. 8, the bearing hole 4a of the bearing 4 is abraded in the load direction of the shaft 3a as shown by the slanted line in the figure.

Therefore, in the conventional bearing device of this type, when the wear of the bearing hole 4a exceeds a certain value in the radial direction, the bearing 4 is judged to have reached the end of life and the bearing 4 is replaced and discarded.

[0005]

Therefore, in the conventional bearing device for a rotating body, there is a problem that the bearing 4 needs to be replaced earlier, which increases the running cost and wastes resources. Further, when the bearing hole 4a is worn, it is impossible to cope with the wear of the bearing unless a spare bearing is provided, and if the bearing is used as it is without being replaced, there is a problem that the function of the equipment is deteriorated.

Therefore, an object of the present invention is to prevent the running cost from being increased and waste resources, and also to prevent the wear of the bearing even when the spare bearing is not provided. To provide a device.

[0007]

Therefore, the present invention provides
For example, as in the following illustrated embodiment, the supporting members 25 and 26 having mounting holes, and the fitting portions 3 that are detachably fitted into the mounting holes of the supporting members 25 and 26 at a plurality of rotational positions.
0a and a bearing 30 having a display portion 30c for displaying the rotational position in which the fitting portion 30a is currently fitted, and a rotary shaft such as a roller shaft 19a that is rotatable through a bearing hole 30d of the bearing 30. And a rotating body such as a sheet conveying roller 19 that supports the rotating body.

According to a second aspect of the present invention, for example, as in the embodiment shown in FIG. 6 below, in the bearing device for a rotating body according to the first aspect, the mounting hole is made square and the fitting is performed. It is characterized in that the portion 30a is formed into a square that fits into it.

According to a third aspect of the present invention, for example, as in the embodiment shown in FIG. 6 below, in the bearing device for a rotating body according to the first aspect, the display portion 30c is attached to the support member 25.
The inside and outside of 26 are provided so as to be visible from inside and outside, respectively.

[0010]

According to the present invention, the bearing hole 30 of the bearing 30
When d is worn, the fitting portion 30a is removed from the mounting hole, the bearing 30 is rotated while looking at the display portion 30c, and the rotation position that has been fitted until now is changed to another rotation position, and the fitting is performed again. Fit the portion 30a into the mounting hole.

According to the second aspect of the present invention, when the bearing hole 30d of the bearing 30 is worn, one of the rotational positions provided for every 90 degrees is selectively used sequentially while looking at the display portion 30c.

According to the third aspect, when the bearing hole 30d of the bearing 30 is worn, the display portion 30c is visually recognized from the inside or outside of the support members 25 and 26 which is easily seen.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 is a laser printer including a bearing device according to an embodiment of the present invention, showing a schematic configuration of the entire internal mechanism thereof.

Reference numeral 10 in the figure denotes a printer body. In the printer body 10, a drum-shaped photosensitive member 1 is provided at the center.
Place 1 Around the photoconductor 11, a charging device 12, a developing device 13, a transfer device 14, and a cleaning device 15 are arranged in the rotation direction shown by the arrow. An optical writer 16 is arranged above the charger 12. A registration roller pair 17 is arranged on the right side of the transfer device 14, while a fixing device 18 and a sheet conveying roller 19 are arranged in order on the left side.

Although not shown, the printer body 10 is provided with a drive motor, and the rotational drive force from the drive motor is transmitted through a gear train to the photoconductor 11 and the developing device 1.
3, various rollers, agitator, registration roller pair 17,
The configuration is such that it is transmitted to the roller of the fixing device 18, the sheet conveying roller 19, the sheet feeding roller 20, and the like.

At the time of recording, therefore, the sheet S is fed from the inside of the sheet feeding cassette 21 in the direction of arrow A in the drawing by the rotation of the sheet feeding roller 20, and the sheet S is abutted against the pair of registration rollers 17 and stopped. Then, the registration roller pair 17 is driven in accordance with the rotation of the photoconductor 11 and is sent toward the photoconductor 11 at a predetermined timing.

The surface of the photoconductor 11 is charged by a charger 12 while rotating clockwise in the drawing, and laser light is irradiated by an optical writer 16 to form an electrostatic latent image on the surface. Then, when passing through the position of the developing device 13, the electrostatic latent image is visualized. The visible image is transferred by the transfer device 14 to the sheet S sent to the photoconductor 11. After the transfer, the sheet S is sent to the fixing device 18, and the transferred image is fixed there. After the fixing, the sheet S ejected from between the rollers of the fixing device 18 is conveyed by the sheet conveying rollers 19, passes through the sheet conveying path 22, is discharged in the direction of arrow B, and is stacked on the sheet discharge unit 23.

On the other hand, after the transfer, the residual toner is removed from the photoconductor 11 by the cleaning device 15, and the charge is removed by the charge removal brush to prepare for the next use.

By the way, the bearing device for the sheet conveying roller 19 which is a rotating member is constructed in detail as shown in FIG.

In the figure, reference numerals 25 and 26 are support members.
These support members 25 and 26 are fixed to the bottom plate 27 at their lower ends, stand upright, and are arranged so as to face each other on both sides. Each support member 2
At the corresponding positions of 5 and 26, mounting holes for a bearing 30 to be described later are provided above and below. Although not shown, the mounting hole has an oval shape for the lower mounting hole and an oblong shape for the upper mounting hole.

The sheet conveying roller 19 is provided between the supporting members 25 and 26. The sheet conveying rollers 19 are arranged in parallel vertically and are rotatably provided by passing both ends of the roller shafts 19a through the bearing holes of the bearings 30, respectively.

Each of the bearings 30 is made of a plastic material, a sintered metal or the like, and as shown in FIG. 1, the fitting portion 30a.
And a collar portion 30b. The fitting portion 30a has an oval outer shape. The collar portion 30b is provided with two display portions 30c by cutting out both sides in the diameter direction of the outer circumference. One display portion 30c is provided with one notch, and the other display portion 30c is provided.
Two notches are provided in c.

Then, as shown in FIG.
When first assembling to the 26, the fitting portion 30a is fitted into the mounting hole on the lower side of the supporting member 25, 26 with the notched display portion 30c facing upward from the outside without loosening, and the hole edge thereof. The bearing 30 is attached by abutting the collar portion 30b on. Similarly, with one display portion 30c facing upward, the fitting portion 30a is fitted into the upper mounting hole of the supporting members 25 and 26 from the outside in the left-right direction without slack and vertically movable, and the flange portion is provided at the edge of the hole. The bearing 30 is attached by abutting 30b.

Then, one end of the coil spring 33 is pressed against the bearing 30 located on the upper side in the drawing. The coil spring 33 presses the other end against the hole edge of the mounting hole and urges the upper sheet conveying roller 19 in the drawing toward the lower sheet conveying roller 19 side. Then, the lower paper transport roller 19
Is pressed against the upper sheet conveying roller 19.

Thus, at the time of recording by the illustrated laser printer,
The driving force from the driving source is transmitted to the roller shaft 19a of the lower sheet conveying roller 19 in FIG. 2 via a gear train (not shown), and the sheet conveying roller 19 is rotationally driven. Then, the upper sheet transport rollers 19 rotate together, and the sheet transport rollers 1
The sheet S after fixing is sandwiched between 9 and 19 and conveyed.

By the way, as shown in FIG. 3, the bearing hole 30d of the bearing 30 arranged on the lower side in FIG. 2 is worn in the load direction of the roller shaft 19a as shown by the hatched portion in the drawing when the diameter is large as shown in FIG. .

When the amount of wear of the bearing hole 30d exceeds a certain level, the fitting portion 30a is removed from the mounting hole of the supporting members 25 and 26, and the display portion 30c is checked to check the bearing 30. Display unit 30c that rotates twice and has two notches
To the turning position, and then the fitting portion 30a is fitted into the mounting hole again to obtain the state shown in FIG. As a result, the contact surface between the roller shaft 19a and the lower portion of the bearing hole 30d is renewed, and the life of the bearing 30 can be extended.

On the other hand, the bearing 30 arranged on the upper side in FIG.
Although not shown, the bearing hole 30d of the roller shaft 19
Wear progresses in the direction opposite to the load direction of a. When the amount of wear of the bearing hole 30d exceeds a certain level,
The bearing 30 is rotated and reused similarly to the case of the bearing 30 described above.

In the illustrated embodiment described above, the mounting hole of the bearing 30 provided in the support members 25 and 26 is formed in an oval shape, and the fitting portion 30a of the bearing 30 is formed in an oval shape. . However, the present invention is not limited to this, and for example, the mounting holes of the support members 25 and 26 may be formed in a square shape, and the fitting portion 30a of the bearing 30 may be formed in a square shape that fits into the mounting hole, as shown in FIG. Good.

In this way, the bearing hole 30 of the bearing 30
When d is worn, one of the rotation positions provided for every 90 degrees is replaced and sequentially used while looking at the display portion 30c, so that the replacement time of the bearing 30 can be changed to the conventional one. It can be delayed by almost 4 times.

Further, in the embodiment shown in FIGS. 1 and 2,
The display portion 30c for displaying the rotation position where the fitting portion 30a is currently fitted is provided only on the outer periphery of the collar portion 30b. However, such a display unit 30c, as shown in FIG.
The structure may be provided on the outer periphery of the collar portion 30b and at the end of the fitting portion 30a on the side opposite to the side where the collar portion 30b is present.

In this way, when the bearing 30 is worn, the display portion 30c is visually recognized from the inside or outside of the support members 25 and 26 which is easy to see, so that the display portion 30c can be easily seen and the workability can be improved. .

In the embodiment shown in FIG. 6, the collar portion 30b is used.
The same display portion 30c is separately provided on the fitting portion 30a so that the display portion 30c can be separately viewed from inside and outside of the support members 25 and 26. However, although not shown, the same display portion 30c may be continuously provided on the collar portion 30b and the fitting portion 30a so that one display portion 30c can be visually recognized from inside and outside of the support members 25 and 26.

In all of the above-mentioned embodiments, the fitting portion 30a and the collar portion 30b are cut out to form the display portion 30c. However, the present invention is not limited to this, and various conceivable arrangements may be made. For example, the fitting portion 30a and the collar portion 30b may be marked to form the display portion 30c.

Further, in all of the above-described embodiments, the bearing device for the sheet conveying roller 19 which is a rotating body has been described. However, the present invention is not limited to this, and the present invention can be applied to, for example, bearing devices for various rollers other than the paper transport roller 19, pulleys, rollers, gears, and other rotating bodies.

[0036]

As described above, according to the present invention, when the bearing hole of the bearing is worn, the fitting portion is removed from the mounting hole,
Rotate the bearing while looking at the display to change it from the previously fitted rotation position to another rotation position, and then refit the fitting part into the mounting hole. Can be sent, running costs can be reduced, and wasteful consumption of resources can be eliminated. Further, even when the spare bearing is not provided, it is possible to deal with the wear of the bearing by rotating the bearing, and it is possible to prevent the deterioration of the equipment function with a simple operation.

According to the second aspect, the bearing 30
When the bearing hole 30d of 10 is worn out, one of the rotational positions provided for every 90 degrees is sequentially changed and selectively used while looking at the corresponding display portion, so that it is nearly four times as large as the conventional one. The effect of can be obtained.

According to the third aspect, the bearing 30
When the bearing hole 30d is worn, since the display portion is visually recognized from the inside or outside of the support member, which is easy to see, the display portion can be easily seen and the workability can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a bearing used in a bearing device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing the bearing device as seen from a direction orthogonal to the axial direction.

FIG. 3 is a state diagram showing a state in which a bearing hole of the bearing is worn, as seen from the direction B in FIG.

FIG. 4 is a rotation state diagram when the bearing is rotated to another rotation position.

FIG. 5 is a schematic configuration diagram of an entire internal mechanism of a laser printer including the bearing device.

FIG. 6 is a perspective view showing another example of a bearing used in the bearing device of the present invention.

FIG. 7 is a configuration diagram showing a conventional bearing device as seen from a direction orthogonal to an axial direction.

8 is a state diagram showing a state in which a bearing hole of the bearing is worn, as viewed from the direction a in FIG.

[Explanation of symbols]

 19 Paper Conveying Roller (Rotating Body) 19a Roller Shaft 25/26 Supporting Member 30 Bearing 30a Fitting Part 30c Display Part 30d Bearing Hole

Claims (3)

[Claims] 1. A support member having a mounting hole, a fitting portion that removably fits into the mounting hole of the support member at a plurality of rotation positions, and a rotation position where the fitting portion is currently fitted. A bearing device for a rotating body, comprising: a bearing having a display portion for displaying; and a rotating body that rotatably supports a rotating shaft through a bearing hole of the bearing. 2. The mounting hole is formed in a square shape, and
The fitting part is made into a square that fits into it.
The bearing device for a rotating body according to claim 1. 3. The bearing device for a rotating body according to claim 1, wherein the display unit is provided inside and outside the support member so as to be visible from inside and outside, respectively.