JP2007209185A - Motor installation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration proof structure easy in installing a stepping motor of a sheet post-processing device. <P>SOLUTION: The installation structure comprises a frame member 50, an elastic member 52, an elastic bushing 54, and a spacer 56 and fastens them with screws. The frame member 50 is for installing a motor 40 to a sheet post-processing device 7 body with an installation hole 50a formed for screwing. The elastic member 52 is substantially plate like formed with a cylindrical protruding part 52a. Outside dimensions of the protruding part 52a are set to be inserted in the installation hole 50a of the frame member 50, and after the insertion, rattling is hardly generated between the frame member 50 and the elastic member 52. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor mounting structure, and more particularly to a motor mounting structure for mounting a motor used in an image forming apparatus or a sheet post-processing apparatus to an apparatus main body.

  In image forming apparatuses and paper post-processing apparatuses, many drive systems are incorporated, and stepping motors are used as motors.

The stepping motor can control a minute step angle, but since the sound and vibration at the time of driving are large, anti-vibration measures for the stepping motor are taken. When the stepping motor is attached, a vibration-proof rubber or the like is used between the housing of the stepping motor and the attachment location. In other words, an anti-vibration rubber is interposed between the motor flange and the mounting bracket on the device body side, so that the vibration of the stepping motor is absorbed by the anti-vibration rubber so that the vibration of the stepping motor is not transmitted to the main body side. Noise is prevented. (For example, refer to Patent Document 1).
JP-A-5-127441

  However, each component has a dimensional tolerance, and it is not easy to align the stepping motor, the mounting frame, and the vibration isolating sheet. For this reason, a special jig for mounting is used, and the number of assembling steps is required, which increases the manufacturing cost.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a motor mounting structure that is simple and has excellent vibration isolation and assembly workability.

According to one embodiment of the present invention, a motor mounting structure for mounting a motor through a frame member in which a mounting hole for screwing is formed,
A convex part that is inserted into the mounting hole of the frame member is formed, and an elastic member that is inserted between the frame member and the motor via the convex part,
An elastic bushing mounted on the frame and engaged with the convex portion;
A spacer that is inserted into the mounting hole and regulates elastic deformation when the elastic member and the elastic bushing are screwed;
A motor mounting structure is provided.

  According to another embodiment of the present invention, there is provided a motor mounting structure in which the frame member and the motor are aligned by the convex portion.

  Furthermore, according to another embodiment of the present invention, there is provided a motor mounting structure characterized in that the elastic member is made of a thermoplastic elastomer.

  According to the present invention, it is possible to obtain a mounting structure that is mechanically separated from the apparatus main body with respect to vibration of the motor and that has good mounting workability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a perspective view showing a main part of a sheet post-processing apparatus 7 to which an embodiment of the present invention is adopted, and FIG. 2 is a schematic configuration showing a sheet post-processing apparatus 7 arranged adjacent to an image forming apparatus 5 such as a copying machine. FIG.

  The sheet post-processing device 7 basically includes a standby tray 10, a processing tray 12, a stapler 14, a first discharge tray 16, and a second discharge tray 18.

    A sheet P formed by an image forming apparatus 5 such as a copying machine and discharged from a pair of paper discharge rollers 6 is received by a pair of entrance rollers 22 and supplied to a pair of paper feed rollers 24 for supply. It is sent from the paper roller 24 to the standby tray 10. The entrance roller 22 is driven by an entrance roller motor 26. A paper path ceiling 36 for guiding the paper P to the paper feed roller 24 is provided between the entrance roller 22 and the standby tray 10. The entrance roller 22 includes an upper entrance roller 22a and a lower entrance roller 22b. The paper feed roller 24 also includes an upper paper feed roller and a lower paper feed roller.

    Below the standby tray 10 is disposed a processing tray 12 on which the sheets P dropped from the standby tray 10 are stacked.

    The processing tray 12 aligns and supports the stacked paper P while the paper P is stapled by the stapler 14 which is a processing mechanism that performs post-processing.

    As shown in FIG. 3, the stapler 14 is positioned by the staple driving unit 49, and the staple processing is controlled. The processing tray 12 has a pair of upper and lower upper alignment rollers 38a and a lower vertical alignment roller 38b shown in FIG. 6 for aligning a plurality of sheets P dropped and supplied from the standby tray 10 in the vertical direction as the transport direction. The vertical and vertical alignment rollers 38 a and 38 b also serve as a bundle conveying roller that sandwiches the sheet bundle T after the stapling process and picks it up from the stapler 14. The upper vertical alignment roller 38a is driven by a vertical alignment upper roller motor 40, and the lower vertical alignment roller 38b is driven by a vertical alignment lower roller motor 42.

    The vertical alignment upper roller motor 40 and the vertical alignment lower roller motor 42 can be constituted by stepping motors.

  The attachment structure of the stepping motor to the sheet post-processing apparatus main body is as shown in the perspective view of FIG. 4 and the cross-sectional view of FIG. That is, this attachment structure is composed of a frame member 50, an elastic member 52, an elastic bushing 54, and a spacer 56, and is screwed.

  The frame member 50 is a member for attaching the motor 40 to the main body of the sheet post-processing apparatus 7 and is attached to the apparatus main body. Therefore, the outer shape of the frame member 50 is determined by the attachment location to the main body of the apparatus 7, the size of the motor 40, and the like.

  A mounting hole 50a for screwing is formed in the frame member 50. The frame member 50 is preferably made of sheet metal and pressed, and the dimensional accuracy of the mounting hole 50a can be managed. Note that the number of mounting holes 50a may be three instead of four.

  The elastic member 52 has a substantially flat plate shape and is formed with a cylindrical convex portion 52a. The outer dimension of the convex portion 52 a is to be inserted into the mounting hole 50 a of the frame member 50. Accordingly, there is almost no backlash between the frame member 50 and the elastic member 52 after the insertion. The elastic member 52 is preferably made of a thermoplastic elastomer. Thermoplastic elastomers are polymeric materials that can be melt molded such as injection molding while having rubbery properties.

  The types of thermoplastic elastomers include styrene, olefin, PVC, urethane, ester, and amide. Higher ester and amide are more suitable where heat resistance is required. Thermoplastic elastomers have the property of returning to their original shape when the load is removed after applying a certain load to the material (rubber elasticity). Therefore, the thermoplastic elastomer should be interposed between the stepping motor and the frame member. Thus, both can be mechanically separated so that vibration is not transmitted to the apparatus side.

  The elastic bushing 54 is placed on the frame member 50 and is engaged with the convex portion 52 a of the elastic member 52. The elastic bushing 54 plays a role of preventing the metallic frame member 50 and the screw 58 from coming into contact with each other, and is not particularly required to be made of a thermoplastic elastomer.

  Next, the spacer 56 is inserted into the mounting hole 50a of the frame member 50, and restricts elastic deformation when the elastic member 52 and the elastic bushing 54 are screwed. Therefore, it is a member made of a cylindrical resin made of a material that is not crushed during screw tightening. The axial length is slightly shorter than the combined height of the elastic member 52 and the elastic bushing 54.

  In the motor mounting structure having such a configuration, vibrations in the rotation direction of the stepping motors 40 and 42 are absorbed by the elastic member 52. Further, due to the elastic bushing 54, the mounting screw 58 and the metallic frame member 50 are not in direct contact with each other.

  Further, since the positioning convex portion 52a is formed on the elastic member 52, positioning with the frame member 50 can be easily performed without using a special jig, so that the assembly time can be greatly shortened. .

  In the above-described embodiment, the stepping motor is described as the vertical alignment upper roller motor 40 and the vertical alignment lower roller motor 42, and the stepping motor mounting structure is used in the sheet post-processing apparatus. It goes without saying that the present invention is not limited to the embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention.

It is a perspective view which shows the principal part of the paper post-processing apparatus to which the attachment structure of the motor which concerns on one Embodiment of this invention is applied. 1 is a schematic configuration diagram illustrating a sheet post-processing apparatus. FIG. 6 is a perspective view illustrating a stapler of the sheet post-processing apparatus. It is a perspective view which shows the attachment structure of the motor which concerns on one Embodiment of this invention. It is sectional drawing which shows the attachment structure of the motor which concerns on one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 5 ... Image forming apparatus, 7 ... Paper post-processing apparatus, 10 ... Standby tray, 12 ... Processing tray, 14 ... Stapler, 16 ... First discharge tray, 18 ...・ Second discharge tray, 22 ... Inlet roller, 22a ... Upper entrance roller, 22b ... Lower entrance roller, 24 ... Feeding roller, 26 ... Inlet roller motor, 28 ... Standby tray roller, 30 ... Standby tray roller drive source, 32 ... Standby tray roller motor, 36 ... Paper path ceiling, 38a ... Upper vertical alignment roller, 38b ... Lower vertical alignment roller, 40 ... Vertical alignment upper roller motor, 42 ... Vertical alignment lower roller motor, 49 ... Staple drive unit, 50 ... Frame member, 52 ... Elastic member, 54 ... Elastic bushing, 56 ... Spacers, 58 ... screws.

Claims (4)

A motor mounting structure for mounting a motor through a frame member in which a mounting hole for screwing is formed,
A convex part that is inserted into the mounting hole of the frame member is formed, and an elastic member that is inserted between the frame member and the motor via the convex part,
An elastic bushing mounted on the frame and engaged with the convex portion;
A spacer that is inserted into the mounting hole and regulates elastic deformation when the elastic member and the elastic bushing are screwed;
A motor mounting structure characterized by comprising:   The motor mounting structure according to claim 1, wherein the frame member and the motor are aligned by the convex portion.   The motor mounting structure according to claim 1, wherein the elastic member is made of a thermoplastic elastomer.   The motor mounting structure according to any one of claims 1 to 3, wherein the motor is a stepping motor.

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