JP3681075B2 - Bearing device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bearing device that rotatably supports a rotating shaft or slidably supports a sliding shaft in, for example, a copying machine, a printer, a facsimile machine, and a printing machine.
[0002]
[Prior art]
Conventionally, in this type of bearing device, the bearing is provided with a fitting portion, and a bearing hole is provided at the center thereof.
[0003]
Then, such a bearing has been fitted into the mounting hole of the support member by press-fitting the fitting portion, or attached with the fitting portion sandwiched between the two support members.
[0004]
[Problems to be solved by the invention]
Therefore, due to variations in accuracy, in the worst case, the outer diameter of the fitting portion of the bearing may be larger than the mounting hole of the support member.
[0005]
For this reason, the conventional bearing device has a problem that the bearing hole is deformed by a strong force for tightening the fitting portion to deteriorate the movement of the shaft, and the frictional heat generated between the bearing and the shaft increases to increase the temperature of the bearing. It was. As a result, for example, the wear of the bearing hole is accelerated and the life of the bearing is shortened.
[0006]
Therefore, an object of the present invention is to prevent the temperature of the bearing from rising due to frictional heat generated between the bearing and the shaft.
[0007]
[Means for Solving the Problems]
Therefore, the present invention is, for example, as shown in the following embodiments in FIGS.
In a bearing device in which a bearing 49 is fitted into a mounting hole 50 of a support member such as the developing case 35 and a shaft such as a roller shaft 53 is supported through the bearing hole 49e of the bearing 49.
The bearing 49 is composed of an outer cylindrical portion 49a that is fitted into the mounting hole 50 and fastened and held by the support member, an inner cylindrical portion 49b having the bearing hole 49e, and a rib portion 49c that connects them , comprising a rib portion 49c Te 1 Tsutoshi, characterized in that.
[0008]
According to the second aspect of the present invention, there are two components such as the upper case 44 and the lower case 45 that constitute the support member such as the developing case 35 as in the embodiments of FIGS. 5 and 6 below. 2. In the bearing device according to claim 1, in the bearing device according to claim 1, the mounting hole 50 is formed by overlapping the two, and the bearing 49 fitted in the mounting hole 50 is sandwiched and held between the two components. Is provided in a radial direction in a direction perpendicular to the direction in which the two constituent parts are overlapped .
[0010]
The pump of Claim 3, for example, as follows in the embodiment of FIG. 9, Oite the bearing device according to claim 1, the outer periphery of the inner cylindrical portion 49b, gradually increases from the inside toward the outside A tapered surface 49g is formed.
[0011]
The pump of Claim 4, for example, as in the embodiment of FIG. 10 below, Oite the bearing device according to claim 1 for use in the developing device, the inner periphery of the outer cylindrical portion 49a, the outside from the inside The taper surface 49h which becomes gradually large toward is formed.
[0012]
The pump of Claim 5, for example, as in the embodiment of Figure 11 below, Oite the bearing device according to claim 1 for use in the developing device, the first seal member to the inner end of the outer cylindrical portion 49a The outer peripheral edge of 57 is in close contact, and the shaft is inserted into the center hole 57a. The second seal member 58 is press-fitted into the shaft, and the seal portion 58a of the second seal member 58 is placed inside the first seal member 57. It is characterized by being elastically pressed.
According to the sixth aspect of the present invention, two components such as the upper case 44 and the lower case 45 that constitute a supporting member such as the developing case 35 are provided as in the embodiments of FIGS. 7 and 8 below. A mounting hole 50 is formed by overlapping, and a bearing 49 is fitted into the mounting hole 50 so that the fitted bearing 49 is sandwiched and held between the two components, and is passed through the bearing hole 49e of the bearing 49. In a bearing device that supports a shaft such as the roller shaft 53,
The bearing 49 is configured by an outer cylindrical portion 49a that is fitted into the mounting hole 50 and is fastened and held by the support member, an inner cylindrical portion 49b having the bearing hole 49e, and a rib portion 49c that connects them.
The support member is provided with a positioning portion 50a for determining the rotational position of the bearing 49, and the rib portion 49c is provided in a diametrical direction in a direction perpendicular to the direction in which the two constituent parts are overlapped. And
[0013]
[Action]
In the present invention, the outer cylinder portion 49a of the bearing 49 is fitted into the mounting hole 50 of the support member, and the shaft is supported through the shaft in the bearing hole 49e of the inner cylinder portion 49b supported by the rib portion 49c between the gaps 55.
[0014]
Further , the inner tube portion 49b is supported by one rib portion 49c.
[0015]
According to the second aspect of the present invention, the mounting hole 50 is formed by overlapping two components, and the bearing 49 fitted in the mounting hole 50 is held between the two components .
[0016]
According to the third aspect of the present invention, for example, when the bearing 49 is lubricated, the oil introduced through the gap 55 flows inward along the tapered surface 49g.
[0017]
The pump of Claim 4, for example, when the developer enters into the bearing 49, moves outward slipped tapered surface 49h.
[0018]
According to the fifth aspect of the present invention, the frictional heat generated between the first seal member 57 and the second seal member 58 is radiated to the outside through the gap 55 when the shaft is driven to rotate.
According to the sixth aspect of the present invention, the mounting hole 50 is formed by superimposing two components, and at that time, the bearing 49 is mounted on the mounting hole 50 by determining the rotation position by the positioning portion 50a. Hold between the parts.
[0019]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 4 shows a schematic configuration of the entire internal mechanism of the laser copying machine, and includes a developing device using a bearing device according to an embodiment of the present invention.
[0020]
In the figure, reference numeral 10 denotes a copying machine main body, and reference numeral 11 denotes a document reading device provided on the upper portion of the copying machine main body 10.
[0021]
Thus, when copying using this laser copying machine, the document 13 is set on the document placing surface 12 and a start button (not shown) is pressed. Then, the image information of the original 13 is read by the reading element 17 using the irradiation lamp 14, the mirror 15, and the lens 16, and the read content is sent to the image processing device 18.
[0022]
On the other hand, the photoconductor 20 is rotationally driven in the direction of arrow A, and the surface thereof is uniformly charged by the charging device 21 at that time. L is irradiated to form an electrostatic latent image on the photoreceptor 20. This latent image is visualized by the developer when passing through the position of the developing device 23. Then, the visible image is transferred by the transfer device 25 to the paper P that has been sent in timing by the registration roller pair 24. After the transfer, the paper P is transported to the fixing device 27 by the transport belt 26, where heat and pressure are applied to fix the visible image on the paper P. Then, after fixing, the paper P is sent out from the fixing device 27 and discharged onto the paper discharge tray 28 to be stacked.
[0023]
The photoreceptor 20 after the transfer of the visible image is prepared for the next use by removing the residual developer with the brush roller 30 of the cleaning device 29 and removing the residual charge with the charge removing lamp 31.
[0024]
The developing device 23 described above is configured in detail as shown in FIG. Reference numeral 35 in the figure denotes a developing case. The developing case 35 has a box shape and is provided with a developing window 36 facing the photoreceptor 20 side. In the developing case 35, a pair of upper and lower developing rollers 37 and 38 are provided in contact with the photosensitive member 20 through the developing window 36 so as to be rotatable, and on the right side of the developing rollers 37 and 38 in FIG. 39, the agitation roller 40, and the mixing roller 41 are arranged in order and provided rotatably.
[0025]
When developing, the mixing roller 41 is rotated clockwise to feed the developer to the stirring roller 40 while mixing the developer, and the developer is stirred while stirring the developer by rotating the stirring roller 40 counterclockwise. The transport roller 39 is replenished, and the developer transport roller 39 is rotated clockwise to adhere the developer to the developing rollers 37 and 38. Then, the developer on the developing rollers 37 and 38 is electrostatically attached to the surface of the photoconductor 20 for development.
[0026]
As shown in the drawing, the developing case 35 of the developing device 23 described above passes through the centers of the respective roller shafts of the developing roller 37, the developer conveying roller 39, the stirring roller 40, and the mixing roller 41 in the drawing. The upper case 44 and the lower case 45 are divided. The upper case 44 and the lower case 45 are each provided with a plurality of convex portions 44b and 45b as shown in FIG.
[0027]
Then, the upper case 44 and the lower case 45 are superposed one on the other along the line XX in FIG. 3, and fixed to the convex portions 44b and 45b with screws 47 as shown in FIG. A plurality of mounting holes 50 are formed along the line.
[0028]
Among the plurality of mounting holes 50..., A bearing 49 is inserted into one mounting hole 50 for mounting the roller shaft 53 of the developer conveying roller 39 as shown in FIGS.
[0029]
The bearing 49 is made of plastic and includes an outer cylinder portion 49a, an inner cylinder portion 49b, and a rib portion 49c. The outer cylinder portion 49a is formed in a cylindrical shape that fits into the mounting hole 50 and has a flange portion 49d at the outer end thereof. The inner cylinder part 49b is formed concentrically with the outer cylinder part 49a, and a bearing hole 49e is provided at the center. Four rib portions 49c are provided in the perpendicular diameter direction, and are formed by connecting the outer cylinder portion 49a and the inner cylinder portion 49b.
[0030]
When the upper case 44 and the lower case 45 are overlapped, the outer cylindrical portion 49a put in the attachment hole 50 is held between the upper case 44 and the lower case 45 and is held at the outer hole edge of the attachment hole 50. The hook 49d is engaged.
[0031]
The bearing hole 49e of the bearing 49 is rotatably provided through the roller shaft 53 of the developer conveying roller 39. The roller shaft 53 has an end protruding outside the bearing 49, and a washer 54 is attached to a circumferential groove at the end, thereby restricting the inner movement of the roller shaft 53 in the axial direction.
[0032]
Although not shown, the roller shaft on the other end side of the developer transport roller 39 is also supported by the developing case 35 via a bearing similar to the bearing 49 described above.
[0033]
Thus, when the developing device 23 is driven, frictional heat generated between the roller shaft 53 of the developer conveying roller 39 and the bearing 49 is diffused to the outside through the gap 55 between the rib portions 49c. Therefore, the temperature rise of the bearing 49 can be reduced, and the wear of the bearing hole 49e due to frictional heat can be prevented from being accelerated.
[0034]
In FIG 示例 the above mentioned, the rib portion 49c has four provided in the diametrical direction orthogonal. Incidentally, in this invention, for example as shown in FIGS. 5 and 6, the rib portion 49c is a provided one radially configuration. In this way, since supporting the inner tube portion 49b at one rib portions 49c, it is mounted in squid comprising rotational position the bearing 49 into the mounting hole 50, the inner cylinder portion 49b by the force fastening the outer cylindrical portion 49a It is possible to prevent the bearing hole 49e from being deformed and prevent the roller shaft 53 from generating a rotational load and maintain the bearing function of the bearing 49 normally.
[0035]
Moreover, it is good also as a structure shown in FIG. 7 and FIG. Reference numeral 50a in the figure is a positioning portion. The positioning portion 50 a is formed by cutting out the hole edge of the attachment hole 50. On the other hand, the bearing 49 is provided with two rib portions 49c in the diametrical direction, and a convex portion 49f on the inner side of the flange portion 49d corresponding to the rib portion 49c. Then, when superimposing the upper case 44 and the lower case 45, put protrusion 49f in the positioning portion 50a, the ribs portion 49c along the direction perpendicular to the overlay that direction thereof upper case 44 and the lower case 45.
[0036]
In this way, the direction of orientation and the rib portion 49c perpendicular to the overlay that direction of the upper case 44 and the lower case 45 is the same by the positioning portion 50a, so to support the inner cylinder portion 49b by the two rib portions 49c The support strength of the inner cylinder portion 49b can be increased without the inner cylinder portion 49b being deformed by the tightening force acting on the outer cylinder portion 49a to deform the bearing hole 49e.
[0037]
Furthermore, in the embodiment described above, the inner diameter of the outer cylinder portion 49a and the outer diameter of the inner cylinder portion 49b are the same. However, as shown in FIG. 9, it is good also as a structure which forms the taper surface 49g which becomes large gradually from the inner side to the outer side in the outer periphery of the inner cylinder part 49b.
[0038]
If you to this, for example when lubricate the bearing 49, the oil was put through voids within 55 flows inward along the tapered surface 49 g, it is possible to reliably and easily lubricate the desired site.
[0039]
Moreover, as shown in FIG. 10, it is good also as a structure which forms the taper surface 49h which becomes gradually large toward the outer side from the inner side in the inner periphery of the outer cylinder part 49a.
[0040]
In this case, the developer that has entered the bearing 49 slides on the tapered surface 49h and falls to the outside, so that it is possible to prevent the developer from staying in the bearing 49 and being melted and solidified by heat.
[0041]
Although not shown, a filter member or the like that prevents leakage of the developer from the gap 55 may be provided in the bearing 49. Further, in order to prevent leakage of the developer from the gap 55, the configuration shown in FIG. Reference numeral 57 in the figure denotes a first seal member. The first seal member 57 is in the form of a thin circular plate having a center hole 57a, and the roller shaft 53 is loosely passed through the center hole 57a, and the outer peripheral edge outside is provided in close contact with the inner end of the outer cylinder portion 49a. On the roller shaft 53, a second seal member 58 is press-fitted and attached. The second seal member 58 is made of a rubber material and elastically presses the periphery of the seal portion 58 a against the inside of the first seal member 57.
[0042]
The first seal member 57 and the second seal member 58 block communication between the bearing 49 and the developing case 35 to prevent developer leakage from the gap 55.
[0043]
Thus, when the roller shaft 53 is driven to rotate, the frictional heat generated between the first seal member 57 and the second seal member 58 is dissipated to the outside through the gap 55, so that the first seal member 57 and the second seal member 58 It is possible to reduce that wear is accelerated by frictional heat.
[0044]
In the illustrated embodiment described above, an example in which the roller shaft 53 of the developer conveying roller 39 is supported is shown. However, although not shown in the drawings, the present invention can be similarly applied to the case where the roller shafts of the developing roller 37, the stirring roller 40, and the mixing roller 41 are supported.
[0045]
Further, in the illustrated embodiment described above, an example in which a rotating shaft such as the roller shaft 53 is supported is shown. However, although not shown in the drawings, the present invention can be similarly applied to the case where the sliding shaft is bearing.
[0046]
【The invention's effect】
As described above , according to the first to fifth aspects of the present invention, the outer cylinder portion of the bearing is fitted into the mounting hole of the support member, and the shaft is supported in the bearing hole of the inner cylinder portion supported by the rib between the gaps. Therefore, the frictional heat generated between the bearing and the shaft can be dissipated through the air gap to reduce the temperature rise of the bearing, and the frictional heat can prevent the wear of the bearing hole from being accelerated.
[0047]
Also , since the inner cylinder part is supported by one rib part, the inner cylinder part is deformed with a strong force to tighten the outer cylinder part even if the outer cylinder part is fitted into the mounting hole at any rotation position, and the bearing hole is deformed. This prevents the occurrence of rotational load on the shaft and maintains the bearing function normally.
[0048]
According to those described in claim 2, the orientation of the direction and the rib portion perpendicular to the direction of superimposing two components is the same, so to support the inner cylinder portion with one rib portion, outside the mounting hole The inner cylinder part is deformed with a strong force that tightens the outer cylinder part no matter where the cylinder part is fitted, preventing the bearing hole from being deformed , preventing the rotation load of the shaft, and maintaining the bearing function normally. can do.
[0049]
According to the third aspect of the present invention, for example, when the bearing is lubricated, the oil introduced through the gap flows inward along the tapered surface, so that it is possible to reliably and easily lubricate the desired portion.
[0050]
According to the fourth aspect of the present invention, for example, when the developer enters the bearing, the developer slides on the tapered surface and moves outward, so that the developer staying in the bearing is melted by frictional heat as in the prior art. It can be prevented from solidifying.
[0051]
According to the fifth aspect of the present invention, when the shaft is driven to rotate, the frictional heat generated between the first seal member and the second seal member is dissipated to the outside through the gap. Speeding up can be reduced.
According to the sixth aspect of the present invention, the direction perpendicular to the direction in which the two components are overlapped by the positioning portion and the direction of the rib portion are the same, and the inner cylinder portion is supported by the two rib portions. The support strength of the inner cylinder part can be increased without deforming the inner cylinder part by the tightening force acting on the part and deforming the bearing hole.
[Brief description of the drawings]
1 is a side view showing a look at the bearings device from the axial direction of the roller shaft.
FIG. 2 is a cross-sectional view taken along line CC in FIG.
FIG. 3 is a schematic configuration diagram of a developing device using the bearing device.
FIG. 4 is a schematic configuration diagram of an entire internal mechanism of a laser copying machine including the developing device.
[5] In the bearing device is a real施例of the present invention, is a side view showing as viewed from the axial direction of the roller shaft.
6 is a cross-sectional view taken along line DD in FIG.
FIG. 7 is a side view showing a bearing device according to another embodiment of the present invention when viewed from the axial direction of the roller shaft.
8 is a cross-sectional view taken along line EE in FIG.
FIG. 9 is a sectional view along a roller shaft of a bearing device according to still another embodiment of the present invention.
FIG. 10 is a cross-sectional view along a roller shaft of a bearing device according to still another embodiment of the present invention.
FIG. 11 is a sectional view along a roller shaft of a bearing device according to still another embodiment of the present invention.
[Explanation of symbols]
35 Development case (supporting member)
44 Upper case 45 Lower case 49 Bearing 49a Outer tube portion 49b Inner tube portion 49c Rib portion 49e Bearing hole 49g Tapered surface 49h Tapered surface 50 Mounting hole 50a Positioning portion

Claims (6)

In a bearing device that fits a bearing into the mounting hole of the support member and supports the shaft through the bearing hole of the bearing,
The bearing is composed of an outer cylinder part that is fitted into the mounting hole and is fastened and held by the support member, an inner cylinder part having the bearing hole, and a rib part that connects them .
Comprising the rib portion Te 1 Tsutoshi bearing device. 2. The bearing device according to claim 1, wherein the mounting hole is formed by overlapping two structural parts constituting the support member, and the bearing fitted in the mounting hole is sandwiched and held by the two structural parts. A bearing device , wherein the rib portion is provided in a radial direction in a direction orthogonal to a direction in which the two constituent portions are overlapped . The bearing device according to claim 1, wherein a tapered surface that gradually increases from the inside toward the outside is formed on the outer periphery of the inner cylinder portion . In the bearing device according to claim 1 for use in the developing device, the inner periphery of the outer cylinder part, ing to form a tapered surface formed gradually increase from the inside to the outside, bearings device. 2. The bearing device according to claim 1, wherein the outer peripheral edge of the first seal member is in close contact with the inner end of the outer cylinder portion, the shaft is passed through a center hole, and the second seal member is placed on the shaft. The bearing device is formed by press-fitting and elastically pressing the seal portion of the second seal member to the inside of the first seal member . A mounting hole is formed by overlapping two constituent parts constituting the support member, a bearing is fitted into the mounting hole, the fitted bearing is held between the two constituent parts, and the bearing of the bearing is held. In the bearing device that supports the shaft through the hole ,
The bearing is composed of an outer cylinder part that is fitted into the mounting hole and is fastened and held by the support member, an inner cylinder part having the bearing hole, and a rib part that connects them.
A bearing device in which the support member is provided with a positioning portion that determines a rotational position of the bearing, and the rib portion is provided in a diametrical direction in a direction orthogonal to a direction in which the two components are overlapped .

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