JP2002372014A - Tightening mechanism for exterior member of image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tightening mechanism for an exterior member of an image forming device capable of securely obtaining positional precision after tightening when tightening end parts of a first member and a second member mutually by a screw. SOLUTION: In this tightening mechanism for the exterior member of the image forming device for tightening the end parts of the first and second members mutually, a projection for guide (insertion projection 11) and a round hole 13 and an oblong hole 14 for inserting a screw are provided on an opposing face to the second member (second plate member 20) in the first member (first plate member 10), a guide hole 21a for guiding and inserting the projection for guide is formed at an opposing position of the projection for guide in the second member, the projection for guide of the first member and the guide hole of the second member are abutted and inserted and are tightened by the screw after the insertion. Consequently, the alignment of the first and second members can be accurately performed when tightening them by the screw.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening mechanism for an exterior member of an image forming apparatus, and more particularly, when the ends of first and second members are screwed together, the positional accuracy after the fastening is reliably obtained. The present invention relates to a fastening mechanism for an exterior member of an image forming apparatus.

[0002]

2. Description of the Related Art Generally, plastics such as polyphenylene ether and polyester are used as a housing (exterior) material of an image forming apparatus such as a copying machine, a facsimile, and a laser printer. As shown in FIG. 3, when the first and second plate members 101 and 102 used for the exterior are fastened by screwing, the end of the first plate member 101 is formed in an L-shape to form a fastening portion. 101a and two screw holes 1 in advance.
An end portion of the second plate member 102 having the end portion 02a formed at a predetermined position of the end portion is disposed on the fastening portion 101a and fastened by a wood screw (slave screw, screw) 103.

[0003]

However, in the conventional fastening method, the position of the screw hole 102a of the second plate member is changed.
It must be machined with high precision, and the wood screws themselves also suffer from processing variations. Therefore, it is difficult to obtain the positional accuracy of the first and second plate members 101 and 102 after the fastening by the conventional fastening method.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fastening mechanism for an exterior member of an image forming apparatus in which when the ends of the first and second members are screwed together, the positional accuracy after the fastening is reliably obtained. To provide.

[0005]

According to a first aspect of the present invention, there is provided an image forming apparatus comprising: an outer member for fastening an end of a first member to an end of a second member; In the mechanism, a guide projection, a round hole and a long hole for screw insertion are provided on a surface of the first member facing the second member, and a guide member is provided at a position facing the guide projection on the second member. A guide hole for guiding the guide projection is formed, and the guide projection of the first member and the guide hole of the second member are inserted in abutment manner. After the insertion, the guide projection is tightened with a screw. Features.

By doing so, for example, FIG.
As shown in (B), the first plate member 10 and the second plate member 20 are accurately positioned by the guide protrusions (insertion protrusions 11) and the guide holes 21a, and the positional accuracy after screw fastening is accurately obtained. .

According to a second aspect of the present invention, a taper is provided at a leading end of the guide projection inserted into the guide hole. With this configuration, since the guide projections are tapered, the guide projections can be smoothly inserted into the guide holes, thereby improving workability.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. 1A is an exploded perspective view of the present embodiment, FIG. 1B is a perspective view after fastening, and FIG.
It is sectional drawing which follows the II-II line of (B). FIG.
As shown in FIGS. 2A and 2B and FIG. 2, the first plate member 10 which is a rectangular “first member” is provided with a “guide protrusion” at a substantially central portion in the depth direction of the lower surface of the right end portion. "
Is formed. Insertion projection 1
Reference numeral 1 denotes a substantially rectangular parallelepiped, and the central axis in the longitudinal direction of the insertion projection 11 is arranged parallel to the right end face 10 a of the first plate member 10. A taper 1 is formed at the left and right corners of the lower surface of the insertion projection 11.
1a is formed. On both outer sides of the longitudinal side surface 11b of the insertion protrusion 11, a long hole 12 and a round hole 13 for inserting a wood screw 14 are respectively formed.

An L-shaped fastening portion 21 is formed at the left end of the second plate 20 which is a rectangular "second member". The depth 20a of the fastening portion 21 is determined by the first plate 1
It is formed so as to have the same thickness as zero, and is formed so that the end face 10a of the first plate member 10 is inserted without looseness. At a position corresponding to the insertion protrusion 11 at a substantially central portion of the fastening portion 21, a rectangular guide hole 21a for inserting the insertion protrusion 11 and guiding the positioning is formed. Here, the positional relationship between the insertion protrusion 11 and the guide hole 21a is accurately determined.

Next, the operation of the present embodiment will be described. First, the insertion protrusion 11 of the first plate 10 is inserted into the second plate 20.
The guide hole 21a is roughly aligned with the guide hole 21a, and the insertion protrusion 11 is inserted into the guide hole 21a. At this time, since the insertion protrusion 11 is formed with the taper 11a, the insertion protrusion 11 is smoothly inserted into the guide hole 21a. Further, since the positional relationship between the insertion protrusion 11 and the guide hole 21a is accurately determined, the positional relationship between the first plate member 10 and the second plate member 20 is accurately determined.

In FIG. 1A, the taper 11a is formed only at the corner in the longitudinal direction of the insertion protrusion 11, but if the taper is also formed at the corner 11c in the short direction, the insertion can be performed more smoothly. .

Next, two wooden screws 14 prepared in advance are inserted into the elongated holes 12 and the round holes 13, respectively, and tightened with a screwdriver (not shown). By doing so, the first plate member 10 and the second plate member 20 are accurately positioned by the insertion protrusion 11 and the guide hole 21a, and are smoothly inserted by the taper, so that workability is improved.

In the present embodiment, the case of the first and second plate members has been described.
Needless to say, the present invention is applicable.

[0014]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, a projection for guiding, a round hole and a long hole for inserting a screw are provided on a surface of the first member facing the second member, and the guide of the second member is provided. A guide hole for guiding the guide projection is formed at a position opposite to the projection, so that when the guide projection and the guide hole are inserted in abutting relation, the first member and the first member can be tightened with a screw. 2
Can be accurately positioned. According to the second aspect of the present invention, a taper is provided at the tip of the guide projection inserted into the guide hole, so that the guide projection can be inserted into the guide hole with good workability.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, in which (A)
Is an exploded perspective view, and (B) is a perspective view after fastening.

FIG. 2 is a cross-sectional view of the embodiment.

FIG. 3 is a perspective view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... 1st board | plate material 10a ... End surface 11 ... Insertion protrusion 11a ... Taper 11b ... Longitudinal direction 11c ... Short side direction 12 ... Long hole 13 ... Round hole 14 ... Wood screw 20 ... 2nd board | plate material 20a ... Depth 21 ... Fastening Part 21a: Guide hole 101: Conventional first plate 101a: Fastening part 102: Conventional second plate 102a: Screw hole 103: Wood screw

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // G03B 17/02 B41J 29/12 A

Claims (2)

[Claims] 1. A fastening mechanism for an exterior member of an image forming apparatus for fastening an end of a first member and an end of a second member, wherein the first member has a surface facing the second member. A guide projection, a round hole and a long hole for screw insertion are provided, and a second
A guide hole for guiding the guide projection is formed at a position facing the guide projection on the member, and the guide protrusion of the first member and the guide hole of the second member are inserted in abutting relation, A fastening mechanism for an exterior member of an image forming apparatus, wherein the fastening is performed with a screw after the insertion. 2. The fastening mechanism for an exterior member of an image forming apparatus according to claim 1, wherein a taper is provided at a tip of the guide projection inserted into the guide hole.