JP3610407B2 - Box frame structure of electronic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a box-type frame structure of an electronic device configured by standing side plates along four sides of a rectangular bottom plate.
[0002]
[Prior art]
For example, the housing of an electrophotographic copying machine scanner (image reading unit) has a box-type frame structure as shown in FIGS.
[0003]
10 is a cutaway perspective view of a case 101 of a conventional scanner, FIG. 11 is an enlarged view of a portion H in FIG. 10, FIG. 12 is an enlarged view of a portion I in FIG. The left and right side plates 103 and 104 and the front and rear side plates 105 and 106 are erected along the four sides of the bottom plate 102 to be formed into a box-shaped frame, and the glass support plates 107 and 108 are placed on the front and rear side plates 105 and 106. Each is attached. An optical scanning system (not shown) is housed in the housing 101, and the upper surface opening is formed by a transparent platen glass (not shown) serving as a document placement table supported on the glass support plates 107 and 108. Covered.
[0004]
By the way, the bottom plate 102 and the side plates 103 to 106 are press-formed products of sheet metal, and the bottom portion 103b of the left side plate 103 formed into a channel shape is bent at right angles inward as shown in detail in FIG. The edge of the short side of the bottom plate 102 was superimposed on the bent bottom portion 102b, and both were joined by caulking or screw tightening. Although not shown, the right side plate 104 and the bottom plate 102 are also joined by the same structure.
[0005]
Further, the upper portion 105a of the front plate 105 is formed in a U-shape, and the lower edge of the front plate 105 is formed at the long side edge of the bottom plate 102 as shown in detail in FIG. It was applied to the upright part 102f from the inside, and both were joined by caulking or screw tightening. Although not shown, the rear side plate 106 and the bottom plate 102 are also joined by the same structure.
[0006]
The left and right side plates 103, 104 and the front and rear side plates 105, 106 are also joined at their ends and similarly joined by caulking or screwing to form a case 101 shown in FIG. 10 having a box-type frame structure. It was.
[0007]
Incidentally, in an electrophotographic copying machine, high rigidity is required for a scanner in order to obtain a high-quality image without image blur. For this reason, conventionally, a contrivance has been made to increase the rigidity of the casing as much as possible by adding a bend or diaphragm shape to the bottom plate and side plates constituting the scanner casing.
[0008]
[Problems to be solved by the invention]
However, there is a limit to the increase in rigidity due to bending and drawing, and the rigidity of the housing is mainly determined by the thickness of the bottom and side plates. Therefore, in order to ensure the necessary and sufficient rigidity for the housing, the bottom and side plates are secured. If the thickness has to be increased, increasing the thickness of the plate causes an increase in the weight of the housing, which causes a problem of reversing the weight reduction.
[0009]
In addition, when the casing is constructed, when the bottom plate, the side plate, and the side plates are joined together by screw tightening or a rivet method, the joining members cannot be constrained with respect to the rotational direction. There was also a problem that the housing was easily twisted and deformed.
[0010]
The present invention has been made in view of the above problems, and an object thereof is to provide a box-type frame structure of an electronic device that can effectively increase the rigidity of the electronic device with almost no increase in weight. It is in.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a box-type frame structure of an electronic device constituted by standing side plates along four sides of a rectangular bottom plate, and when assembling the box-type frame, A square pipe structure is formed along the inner peripheral edge of the box- shaped frame by joining the bottom plate and the side plate in combination.
[0012]
According to a second aspect of the present invention, in the first aspect of the invention, either one of the bottom plate or the side plate is bent at a right angle, the other edge is bent in a step shape, and the bottom plate and the side plate are joined and integrated. The square pipe structure is formed by bending portions of the two.
[0013]
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the bottom plate, the side plate, and the side plates are joined together by welding.
[0014]
According to a fourth aspect of the present invention, in the third aspect of the present invention, a plurality of joints may be provided at any one joint end of the bottom plate and the side plate joined to each other and any one joint end of the side plates joined to each other. The base plate, the side plate, and the side plates are joined by forming a plurality of holes integrally at appropriate intervals, forming a plurality of holes in each other joint where the protrusions are not formed, and inserting and inserting the protrusions into the holes. It is characterized by that.
[0015]
The invention according to claim 5 is the invention according to claim 3 or 4, characterized in that the welding is plasma welding or laser welding.
[0016]
Therefore, according to the first or second aspect of the present invention, since the square pipe structure is formed along the inner peripheral edge of the box-type frame with the existing bottom plate and side plate without adding another member, the weight is almost increased. In addition, the square pipe structure can effectively increase the rigidity of the electronic device.
[0017]
According to the invention of claim 3, 4 or 5, since the bottom plate, the side plate, and the side plates are joined by welding (plasma welding or laser welding), the joining members are also restrained in the rotational direction, and the torsional rigidity of the electronic device is increased. As a result, the torsional deformation of the electronic device is suppressed to a small level and the assemblability is improved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0019]
1 is a plan view of the scanner housing, FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1, FIG. 3 is an enlarged sectional view taken along line BB in FIG. 1, and FIG. 5 is an enlarged sectional view taken along the line D-D in FIG. 1, FIG. 6 is a cutaway perspective view of the housing, FIG. 7 is an enlarged view and an exploded perspective view of a portion E in FIG. FIG. 9 is an exploded perspective view of the G part in FIG. 6.
[0020]
The scanner according to the present embodiment is an electronic device provided in the upper part (not shown) of the main body of the electrophotographic copying machine, and the housing 1 includes left and right side plates 3 along four sides of a rectangular bottom plate 2. 4 and front and rear side plates 5 and 6 are erected and formed into a box-shaped frame shape, and glass support plates 7 and 8 are mounted on the front and rear side plates 5 and 6, respectively. An optical scanning system (not shown) is accommodated in the housing 1, and the upper surface opening is made of a transparent platen glass (not shown) serving as a document placement table supported on the glass support plates 7 and 8. Covered.
[0021]
Thus, the housing 1 of the scanner according to the present embodiment has a so-called monocoque structure in which the bottom plate 2 and the side plates 3 to 6 are joined and integrated by welding, and the bottom plate 2 and the side plates 3 to 6 are combined. A square pipe structure is formed along its inner periphery. That is, a rectangular frame composed of square pipes a, b, c, and d is formed on the inner peripheral edge of the housing 1, and the entire housing 1 is reinforced by the rectangular frame.
[0022]
Hereinafter, details of the configuration of the housing 1 will be described.
[0023]
The bottom plate 2, the side plates 3 to 6 and the glass support plates 7 and 8 are press-formed products of sheet metal, and the left and right side plates 3 and 4 are formed into a channel shape as shown in FIGS. The upper portions 3a and 4a and the bottom portions 3b and 4b are bent inward at a right angle.
[0024]
On the other hand, as shown in FIG. 2 and FIG. 7, the left end portion of the bottom plate 2 is bent stepwise to form a standing portion 2a and a horizontal portion 2b, and a plurality of protrusions 2c (see FIG. 7 is formed integrally at an appropriate interval.
[0025]
Thus, as shown in FIG. 7, the protrusions 2c formed integrally with the edge of the horizontal portion 2b of the bottom plate 2 are inside the rectangular holes 3c formed in the left plate 3 (in the direction of the arrow in FIG. 7). The bottom plate 2 and the left side plate 3 are joined by being inserted and welded together, and the square pipe a is constituted by the bent portions of the two by this joining. That is, as shown in FIG. 2, a square pipe a is constituted by the side 3d and the bottom 3b of the left side plate 3 and the standing part 2a and the horizontal part 2b of the bottom plate 2 at the left corner (corner) in the housing 1. A space S1 having a square cross section is formed in the square pipe a.
[0026]
Similarly, the right end portion of the bottom plate 2 is also bent stepwise as shown in FIG. 3 to form upright portions 2d and horizontal portions 2e, and a plurality of protrusions are formed at appropriate intervals on the edge of the horizontal portion 2e. It is integrally formed. Then, the bottom plate 2 and the right side plate 4 are joined by inserting the projections integrally formed on the edge of the horizontal portion 2e of the bottom plate 2 into a rectangular hole formed in the right side plate 4 and welding them. By this joining, the square pipe b is formed by the bent portions of both. That is, as shown in FIG. 3, a square pipe b is formed at the right corner (corner portion) in the housing 1 by the side portion 4d and bottom portion 4b of the right side plate 4 and the standing portion 2d and horizontal portion 2e of the bottom plate 2. A space S2 having a rectangular cross section which is long in the vertical direction is formed in the square pipe b.
[0027]
On the other hand, as shown in FIGS. 4, 5, 8 and 9, the front and rear side plates 5 and 6 have upper portions 5a and 6a formed in a U-shape, and the lower edge of FIG. As shown in FIG. 9, a plurality of protrusions 5b and 6b (only one is shown in FIGS. 8 and 9) are integrally formed at an appropriate interval. Moreover, as shown in FIGS. 5 and 8, a plurality of protrusions 5c and 6c formed by cutting and raising are formed at the corners of the U-shaped portions 5a and 6a on the upper portions of the front and rear side plates 5 and 6, respectively. It protrudes horizontally toward the outside.
[0028]
On the other hand, the front and rear end portions of the bottom plate 2 are bent upward to form upright portions 2f and 2g, and the upper end edges of the upright portions 2f and 2g are as shown in FIGS. A plurality of engagement grooves 2h and 2i (only one is shown in FIG. 8) are formed, and a plurality of rectangular holes 2j (only the front plate 5 side is shown in FIG. 8) are provided inside the standing portions 2f and 2g. It has been drilled.
[0029]
Thus, as shown in FIG. 8, the protrusions 5b formed integrally with the lower edge of the front plate 5 are inserted into the rectangular holes 2j formed in the bottom plate 2, and the front plate 5 is cut and raised. The formed protrusions 5c are fitted into the engaging grooves 2h formed at the upper edge of the upright portion 2f of the bottom plate 2, and the protrusions 5b and 5c are welded to form the bottom plate 2, the front plate 5, and Are joined, and the square pipe c is formed by the bent portions of the two. That is, as shown in FIG. 4, a square pipe c is formed at the front corner (corner portion) in the housing 1 by the rising portion 5 d and the horizontal portion 5 e of the front plate 5 and the rising portion 2 f and the bottom portion 2 k of the bottom plate 2. A space S3 having a rectangular cross section that is long in the vertical direction is formed in the square pipe c. The glass support plate 7 which is bent at a right angle to form an angle member is joined to the outer surface of the upper portion 5a of the front plate 5 , and this glass support plate 7 is attached to the upper portion 5a of the front plate 5 by screwing. .
[0030]
Similarly, the bottom plate 2 and the rear side plate 6 are joined together, and the square pipe d is formed by the bent portions of the joints. That is, as shown in FIG. 5, the rear corner (corner portion) in the housing 1 is formed of a square pipe d by a standing portion 6 d and a horizontal portion 6 e of the rear side plate 6 and a standing portion 2 g and a bottom portion 2 k of the bottom plate 2. In this square pipe d, a space S4 having a rectangular section that is long in the vertical direction is formed. The glass support plate 8 is joined to the outer surface of the upper portion 6a of the rear plate 6, and the glass support plate 8 is attached to the upper portion 6a of the rear plate 6 by screwing.
[0031]
By the way, the left and right side plates 3, 4 and the front and rear side plates 5, 6 are joined by the structure shown in FIG. 9 shows the joining structure of the left side plate 3 and the rear side plate 6, the same applies to the joining structure of the left side plate 3 and the front side plate 5, the front side plate 5 and the right side plate 4, and the right side plate 4 and the rear side plate 6. Therefore, illustration and description thereof are omitted.
[0032]
As shown in FIG. 9, four protrusions 6 f are integrally formed on the longitudinal end surface of the rear plate 6, and four rectangular holes 3 f are formed in the left plate 3 correspondingly.
[0033]
Thus, the rear plate 6 and the left side plate 3 are joined by inserting the protrusions 6f formed on the end surface in the longitudinal direction of the rear side plate 6 into the rectangular holes 3f formed in the left side plate 3 and welding them. The left side plate 3 and the front side plate 5, the front side plate 5 and the right side plate 4, and the right side plate 4 and the rear side plate 6 are joined in the same manner. Here, as shown in FIG. 6, the square pipe d of the rear side plate 6 and the square pipe b of the right side plate 4 are a corner portion of the casing 1, and the square pipe b is abutted against the standing portion 6 d of the square pipe d. However, similarly, the square pipe d of the rear side plate 6 and the square pipe a of the left side plate 3 are abutted against the upright portion 6d of the square pipe d at the corner portion of the casing 1. Further, the square pipe c of the front side plate 5 and the square pipe b of the right side plate 4, and the square pipe c of the front side plate 5 and the square pipe a of the left side plate 3 are corner portions of the housing 1, and standing portions of the square pipe c. 5d and the square pipe b, and the standing part 5d and the square pipe a are abutted.
[0034]
The scanner casing 1 according to the present embodiment is configured by joining and integrating the bottom plate 2 and the side plates 3 to 6 by welding, and plasma welding or laser welding is adopted as welding.
[0035]
As described above, the scanner casing 1 having the box-type frame structure is configured. In this embodiment, the square pipe structure is formed by the existing bottom plate 2 and side plates 3 to 6 without adding another member. Since it is formed along the inner peripheral edge of the body 1, the rigidity of the housing 1 can be effectively increased by the rectangular pipe structure having a rectangular frame shape with almost no increase in weight, and there is no image blur in an electrophotographic copying machine. A high quality image can be obtained stably.
[0036]
Specifically, the case 1 according to the present embodiment has a weight increase of only 0.2 times that of the conventional case 101 shown in FIG. Therefore, the rigidity of the casing 1 according to the present invention is dramatically increased to nine times that of the conventional casing 101. Diagonal strain is the amount of displacement of the load point when a load is applied to the left front end with the upper right and left ends of the housing restrained and the right front end and left rear end supported from below. say.
[0037]
Moreover, in the housing | casing 1 which concerns on this Embodiment, since the bottom plate 2, the side plates 3-6, and the side plates 3-6 were joined by welding (plasma welding or laser welding), the bottom plate 2, the side plates 3-6, and the side plates 3-3 are joined. The six members are also constrained in the rotational direction to increase the torsional rigidity of the housing 1, torsional deformation of the housing 1 is suppressed to a small level, and the assembly of the housing 1 is facilitated to improve its assemblability.
[0038]
In the above embodiment, an example in which the present invention is applied to a scanner of an electrophotographic copying machine has been described. However, the present invention is similarly applied to a case of any other electronic device having a box-type frame structure. Of course, it is applicable to.
[0039]
【The invention's effect】
As apparent from the above description, according to the invention described in claim 1 or 2, the square pipe structure is formed along the inner peripheral edge of the box-type frame with the existing bottom plate and side plate without adding another member. The square pipe structure can effectively increase the rigidity of the electronic device with almost no increase in weight.
[0040]
According to the invention of claim 3, 4 or 5, since the bottom plate, the side plate, and the side plates are joined by welding (plasma welding or laser welding), the joining members are also restrained in the rotational direction, and the torsional rigidity of the electronic device is increased. As a result, the torsional deformation of the electronic device can be suppressed to a small level and the assemblability can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view of a scanner housing having a box-type frame structure according to the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.
FIG. 3 is an enlarged cross-sectional view taken along line BB in FIG.
4 is an enlarged cross-sectional view taken along the line CC in FIG.
FIG. 5 is an enlarged sectional view taken along line DD of FIG.
FIG. 6 is a cutaway perspective view of a housing of a scanner having a box frame structure according to the present invention.
7 is an enlarged view and an exploded perspective view of a portion E in FIG. 6. FIG.
8 is an enlarged view and an exploded perspective view of a portion F in FIG. 6. FIG.
9 is an exploded perspective view of a G part in FIG. 6. FIG.
FIG. 10 is a cutaway perspective view of a housing of a conventional scanner.
11 is an enlarged view of a portion H in FIG.
12 is an enlarged view of a portion I in FIG.
[Explanation of symbols]
1 Case (box frame of electronic equipment)
2 Bottom plate 2c Protrusion 2j Rectangular hole (hole)
3-6 Side plate 3c, 3f Rectangular hole (hole)
5c, 6c, 6f Projections 7, 8 Glass support plates a to d Square pipe

Claims (5)

In the box-type frame structure of an electronic device configured by erecting side plates along four sides of a rectangular bottom plate,
A box- shaped frame structure for an electronic device, wherein a square pipe structure is formed along an inner periphery of the box-shaped frame by combining and joining the bottom plate and the side plate when the box- shaped frame is assembled. Either one of the bottom plate or the side plate is bent at a right angle, the other edge is bent in a step shape, and the bottom plate and the side plate are joined and integrated to form the square pipe structure at both bent portions. The box-type frame structure for an electronic device according to claim 1. The box-type frame structure for an electronic device according to claim 1 or 2, wherein the bottom plate, the side plate, and the side plates are joined together by welding. A plurality of protrusions are integrally formed at an appropriate interval at a joining end of any one of the bottom plate and the side plate to be joined to each other and to one joining end of the side plates to be joined to each other. 4. A box shape for an electronic device according to claim 3, wherein a plurality of holes are formed in each other joint portion that is not formed, and the bottom plate, the side plates, and the side plates are joined by inserting and projecting the protrusions into the holes. Frame structure. 5. The box-type frame structure for an electronic device according to claim 3, wherein the welding is plasma welding or laser welding.

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