JP2000161345A - Installing structure of rotary shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installing structure of rotary shaft in which the installing and the removing of a rotary shaft to from a device can be carried out simply at a single operation, and an assembly to increase the member density can be carried out without including a dead space. SOLUTION: A pair of arms 3b of a holder 3 utilizing a wire rod deformed elastically are positioned almost along the opening width of a constraint seat 4a which is cut out to inset the outer race 2b of a bearing 2 installed to a rotary shaft 1, the putting in and out of the outer race 2b are permitted by the elastic deformation expanded between the arms 3b, and when the outer race 2b is inserted in the restraint seat 4a, the outer race is restrained by the arms 3b in the inserting direction, as wall as the outer peripheral surface of the outer race 2b is abutted to the inner peripheral surface of the restraint seat 4a. As a result, the rotary shaft 1 can be fixed through the bearing and the holder 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for mounting a rotating shaft such as various kinds of relatively lightweight rollers on a frame or a housing of an apparatus. The present invention relates to a rotating shaft mounting structure that can be sufficiently maintained.

[0002]

2. Description of the Related Art When a roller or other rotary shaft is mounted on a frame, chassis, housing, or the like of an apparatus, a rotary bearing or a bearing metal is generally used in the field of mechanical design. In the field of office equipment and precision equipment, high rotational precision and assembly precision are required, and thus radial or radial thrust ball bearings are mainly used. This ball bearing incorporates a ball between an inner race and an outer race, and is used as an assembly in which the inner race is fixed to the outer periphery of a roller or a rotating shaft.

[0003] In addition to such bearings, various types of bearings are mounted on a frame or the like of an apparatus in which an outer race of a bearing previously mounted on a rotating shaft is rigidly fixed by a holder or a clamper provided on the frame. When the rotational load is large, the plummer block in which the bearing is integrated is fixed to the bearing, and the bearing is assembled through the rotating shaft.

[0004]

However, when using a holder, a clamper, or a plummer block, the rotating shaft has a bearing rigidly fixed to the frame or housing side, and screws or bolts are used as the fixing means. Is done. For this reason, in disassembling work at the time of assembling or exchanging parts of the rotating shaft, it is necessary to tighten or remove these screws and bolts, and the rotating shaft cannot be attached or removed by a one-touch method. Therefore, in the case of a roller or a rotating shaft which is frequently replaced, not only the replacement work becomes complicated, but also it is necessary to include a space for installing a tool on a screw or a bolt in the apparatus in advance, so that the member density is high. In the case of equipment, it also affects the degree of freedom in design.

On the other hand, in the case of a relatively light rotating shaft, instead of rigidly fixing the bearing such as a holder or a plummer block, the fixing to the frame or the housing side and the release thereof are performed in the axial direction by a spring. In some cases, the load is used. This is achieved, for example, by providing a pair of cylindrical sleeves which are rotatably supported by inserting both ends of a rotary shaft on the frame or housing side, and changing the position by a spring which biases one of the sleeves in the axial direction of the rotary shaft. It is configured. In such a combination of the sleeve and the spring, the support and release of the rotating shaft can be performed by moving the sleeve supported by the spring. Is simple.

[0006] However, assembling and disassembling the rotating shaft requires a space for moving the sleeve biased by the spring, and therefore lacks compatibility with an assembly having a high member density as in the previous example. In addition, in the work of mounting and disassembling the rotating shaft, the sleeve that is biased by the spring is moved, and then the rotating shaft is inserted and removed, so that only a deep working space in the device and a small working space can be taken In such a case, workability is significantly deteriorated.

As described above, in the conventional rotating shaft mounting structure, the area occupied by the mechanism provided for facilitating assembly and disassembly is liable to fall into a dead space, which hinders a high density of members, and in addition to the rotating shaft. Installation and disassembly cannot be performed with only one hand, which is troublesome.

The problem to be solved in the present invention is to provide a rotary shaft mounting structure which can easily mount and disassemble the rotary shaft to the device with one touch, and which can be assembled with a high density of members without including dead space. Is to do.

[0009]

According to the present invention, the rotating shaft is attached to the mounting member via an inner race which is extrapolated and fixed to the rotating shaft and an outer race which is fixed to a mounting member on which the rotating shaft is mounted. A restraining seat having an opening width into which the outer peripheral surface of the outer race can be inserted into the mount member in a cutout shape, and allowing the outer race to be inserted into and out of the restraining seat, and an inner surface of the restraining seat. And a holder for fixing and holding the outer race between the outer race and the outer race.

In such a configuration, if the outer race of the bearing mounted on the rotating shaft is inserted into the restraining seat of the mount member, the rotating shaft is fixed at a fixed position by the holding tool. The restraint by the seat is released, and the rotation shaft can be removed from the mount member.

[0011]

According to the first aspect of the present invention, the rotary shaft is mounted on the rotary shaft via a bearing formed by an inner race externally fixed to the rotary shaft and an outer race fixed to a mount member on which the rotary shaft is mounted. A structure for attaching the outer race to the member, wherein the mount member is formed with a notch-shaped restraint seat having an opening width into which an outer peripheral surface of the outer race can be inserted, and the restraint seat is allowed to be inserted into and removed from the restraint seat. A rotating shaft mounting structure including a retainer for fixing and holding the outer race between the inner surface of the seat and the outer race, and has a function of being easily attached to and detached from a restraining seat of a mount member via a bearing mounted on the rotating shaft. .

According to a second aspect of the present invention, the holder is
An elastically deformable wire disposed along a surface of the mount member, comprising a pair of arms including a neck having a minimum interval smaller than an outer diameter of an insertion portion of the outer race within a notch width of the restraint seat. 2. The mounting structure for a rotating shaft according to claim 1, wherein the outer race can be easily inserted into and removed from the restraining seat by elastic deformation of the holder using the wire, and the outer race is embraced by the restraining seat by the neck of the wire when fixed. Has the effect that it can be fixed stably so that

According to a third aspect of the present invention, there is provided the rotating shaft mounting structure according to the first or second aspect, wherein an inner peripheral surface on a rear side of the restraining seat is aligned with an outer peripheral surface of the outer race. Since a part of the peripheral surface is fitted to the inner peripheral surface of the restraint seat and restrained by the holder, there is an effect that the rotating shaft can be further stably fixed.

According to a fourth aspect of the present invention, the outer race includes an annular groove having an opening width substantially equal to a sum of a thickness of the mount member around the restraining seat and an outer diameter of a holder for the wire rod. 4. The mounting structure for a rotating shaft according to claim 2, wherein the annular groove is fitted to the mount member and the holder around a restraining seat, wherein the annular groove of the outer race of the bearing is provided on the mount member and the holder. The fitting also regulates the position of the bearing in the axial direction, and has the effect of preventing rattling in the axial direction of the rotating shaft.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a main part of a mounting structure for a rotating shaft according to the present invention. The mounting structure according to the present invention includes a bearing 2 attached to one end of a rotating shaft 1 and a holder 3 for restraining the bearing 2. And is detachably attached to a bracket 4 as a mounting member.

The rotating shaft 1 is a rotating member such as a gear shaft in which rollers and the like are integrated as described later, and has bearings 2 at both ends in the axial direction. The bearing 2 is, for example, a radial ball bearing, and includes an inner race 2a fitted on the outer periphery of the rotating shaft 1 and fixed integrally therewith, and an outer race 2b rotatably mounted therearound via a ball (not shown). It is a well-known device provided in the related art. The outer race 2b is separated from the axial end by an end flange 2c having the largest outer diameter.
And an annular groove 2d formed to have the smallest diameter in succession to this.

The bracket 4 is a flat plate provided inside the device that houses the rotating shaft 1, and may be any member that is formed in a rib shape inside the device. The bracket 4 is provided with a restraint seat 4a for inserting and restraining the bearing 2 and a fitting hole 4b for fitting and holding a part of the base end of the holder 3. The restraining seat 4a is notched from the edge of the bracket 4 and has a notch width of a degree having an appropriate dimensional tolerance with respect to the outer diameter of the annular groove 2d of the bearing 2, and a deep portion in the notch direction has an annular groove 2d. Is a circular arc surface 4a-1 which receives exactly.

The holder 3 is made of, for example, a steel wire using spring steel, and allows the bearing 2 to be inserted in a direction indicated by an arrow in FIG. 1 by utilizing elastic deformation. That is, a hook 3a that fits tightly into the fitting hole 4b of the bracket 4 is provided at the center of the base end side of the holder 3, and has a shape symmetrical with respect to a line passing through the center of the hook 3a. A pair of arms 3b is provided, and these arms 3b can be elastically deformed in a direction indicated by a chain line in FIG. The pair of arms 3b has a shape in which the tip sides approach each other, and the closest part is the neck 3c.
In addition, a portion of the neck 3c whose tip is slightly opened outward is referred to as a guide 3d. FIG. 2 shows that the hook 3a of the holder 3 is fitted into the fitting hole 4b and the bracket 4 is
FIG. 9 is a perspective view of a state in which the arm 3b is attached to the neck 3c of the arm 3b. When no load is applied, the distance between the necks 3c of the pair of arms 3b is smaller than the outer diameter of the annular groove 2d of the bearing 2.

It should be noted that the total thickness of the bracket 4 and the diameter of the holder 3 using a steel wire is substantially equal to or slightly smaller than the width of the annular groove 2d of the bearing 2.

In the above construction, as shown in FIG.
The annular groove 2d is roughly aligned with the restraint seat 4a and inserted in the direction of the arrow. When the annular groove 2d reaches the tip of the pair of arms 3b of the holder 3, the peripheral surface of the annular groove 2d enters the guide 3d which is open in the vertical direction in FIG.
The arm 3b is elastically deformed and pushed open as it proceeds to the side. When the peripheral surface of the annular groove 2d passes through the neck 3c, the arm 3b gradually recovers and closes, and finally, as shown in FIGS.
a to the arc surface 4a-1.

As described above, the annular groove 2d of the bearing 2 is
a, the arm 3b of the holder 3 spreads once to allow passage through the neck 3c, and thereafter the arm 3b
Restrains the annular groove 2d so as to embrace the annular groove 2d and abuts its peripheral surface exactly against the circular-arc surface 4a-1 of the restraint seat 4a. Then, as shown in FIG. 4, the wire of the bracket 4 and the holder 3 is fitted into the annular groove 2d, so that the bearing 2 receives the restraining force by the bracket 4 also in the axial direction. Therefore, the bearing 2 is prevented from moving in the direction of withdrawal from the restraint seat 4a, and at the same time, is prevented from moving in the axial direction.
The rotating shaft 1 is positioned on the bracket 4 and held in a stable state.

When the rotating shaft 1 is to be removed from the bracket 4, the rotating shaft 1 is pulled by hand in a direction in which the bearing 2 is removed from the restraint seat 4a in FIG. At this time, the arm 3b expands and deforms as the annular groove 2d is pulled out,
After passing through the neck 3c, the bearing 2 is taken out by being pushed out by the guide 3d.

As described above, the rotating shaft 1 has a pair of arms 3b of the holder 3 that project the bearing 2 into the restraint seat 4a.
It can be easily attached to and detached from the bracket 4 simply by inserting and removing the annular groove 2d. This attachment / detachment operation can be performed simply by holding and pulling the rotating shaft 1, and there is no need to remove bolts, screws, and the like. Further, since the mounting and dismounting operation can be performed by simply adding the holder 3 using the wire to the bracket 4 which is minimum necessary to support the rotating shaft 1, the capacity for supporting the rotating shaft 1 does not increase. There is no increase in dead space. Therefore, even if the device has a high arrangement density of members, it does not interfere with peripheral devices or restrict the degree of freedom of design.

FIG. 4 shows an example in which both ends of the rotating shaft 1 are mounted on a pair of brackets 4 via bearings 2, but the mounting structure at the right end is exactly the same as that shown in FIGS. .

Here, as is apparent from FIGS. 3 and 4, the arm 3b of the holder 3 embraces the peripheral surface of the annular groove 2d and elastically attaches this peripheral surface to the arc surface 4a-1 of the restraint seat 4a. By urging, the bearing 2 is fixed to the bracket 4 side.
Therefore, even if the holding force of the holder 3 is not strong,
3 and 4, when the bearing 2 receives a load upward, this load is transmitted only to the apparatus side via the bracket 4, and the bearing 2 does not come off from the bracket 4. . It is of course possible to use the rotating shaft 1 utilizing such slip prevention, and this will be described with reference to FIG.

In FIG. 4, a roller 5 is integrally attached to a rotating shaft 1 whose both ends are supported by bearings 2. The roller 5 is for feeding paper, for example, in an image forming apparatus such as a copying machine. Since the roller 5 is relatively light in weight, it can be supported by the holder 3 using the wire according to the present invention. Further, another pair of rollers 6 for nipping and feeding the sheet together with the rollers 5 is provided. The roller 6 is also held by a similar support structure, and may have a structure in which the rotating shaft 1 provided with the roller 5 of FIG. 4 and its support structure are vertically inverted.

With such a structure in which the rollers 5 and 6 are arranged one above the other and abutted against each other, a load for pushing up the bearing 2 acts on the roller 5 arranged on the upper side and a downward load acts on the roller 6 arranged on the lower side. Only reach. Therefore, during the period in which the roller 5 is installed and operated in the apparatus, the roller 5 arranged on the upper side is operated.
Of the rotating shaft 1 from the bracket 4 of the bearing 2
The same applies to the case of the roller 6 disposed below, and the use of the elastically deformable holder 3 does not affect the sheet feeding by the rollers 5 and 6.

It is to be noted that not only the above-mentioned paper feed roller but also a rotary shaft provided with gears meshing with each other is the same, and the rotary shaft is not limited to the vertical arrangement as shown in FIG. Alternatively, the assembly may be such that the axes are inclined obliquely.

[0029]

According to the present invention, it is possible to fix and release the outer race of the bearing attached to the rotary shaft by simply inserting and removing the outer race with respect to the restraint seat of the mount member,
The rotary shaft can be easily attached and detached as long as the bearing is aligned with the restraint seat, and even if the device or equipment has a high density of members and does not have a large work space, the rotary shaft can be easily assembled and disassembled.

[Brief description of the drawings]

FIG. 1 is an exploded schematic perspective view showing members of a rotating shaft mounting structure of the present invention.

FIG. 2 is a perspective view showing a state in which a holder is attached to a bracket in the member arrangement of FIG. 1;

FIG. 3 is a front view of a main part when the rotating shaft is fixed to a bracket together with its bearing.

FIG. 4 is a schematic diagram when both ends of a rotary shaft having rollers are mounted on a bracket via bearings.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation shaft 2 Bearing 2a Inner race 2b Outer race 2c End face flange 2d Annular groove 3 Holder 3a Hook 3b Arm 3c Neck 3d Guide 4 Bracket 4a Restriction seat 4a-1 Arc surface 4b Fitting hole 5,6 Roller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 15/00 550 G03G 15/00 550

Claims (4)

[Claims] 1. A structure in which said rotary shaft is mounted on said mount member via a bearing comprising an inner race which is extrapolated and fixed to a rotary shaft and an outer race which is fixed to a mount member on which said rotary shaft is mounted. A notch-shaped restraining seat having an opening width into which the outer peripheral surface of the outer race can be inserted is formed, and the outer race can be inserted into and removed from the restraining seat, and the outer race is fixed to the inner surface of the restraining seat. A rotating shaft mounting structure including a holding tool for holding. 2. The retainer is a resiliently deformable wire disposed along the surface of the mount member, the retainer having a neck with a minimum interval smaller than an outer diameter of an insertion portion of the outer race, a notch of the restraint seat. The rotating shaft mounting structure according to claim 1, further comprising a pair of arms included in the width. 3. The mounting structure for a rotary shaft according to claim 1, wherein an inner peripheral surface on a rear side of the restraining seat is aligned with an outer peripheral surface of the outer race. 4. The outer race has an annular groove having an opening width substantially equal to the sum of the thickness of the mount member around the restraining seat and the outer diameter of the wire holder, and the mounting member around the restraining seat. 4. The rotating shaft mounting structure according to claim 2, wherein said annular groove is fitted to said holder and said holder.