JP3912962B2 - Housing frame for electrical equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a housing frame of various electrical equipment such as office equipment such as an image forming apparatus and communication equipment.
[0002]
[Prior art]
As shown in FIG. 6, a housing frame 200 of various electrical equipment such as office equipment such as an image forming apparatus and communication equipment includes side plates 1, 2, columns 3, a top plate 4, and a bottom plate each made of sheet metal, pipe material, and the like. 5, the stay 6, the reinforcing plate 7 and the like, and the bottom plate 5 is configured as a flat plate as a whole (first conventional example).
[0003]
Further, as shown in FIG. 7, deformed portions 81 and 8283 that are deformed so as to protrude in one direction in the thickness direction of the bottom plate 5 are provided at the central portion, the outer peripheral portion, and the inner periphery of the bottom plate 5. (See JP-A-11-186744). Alternatively, there is a case where a thick portion having a thickness larger than other portions of the bottom plate is provided (second conventional example).
[0004]
Further, as shown in FIG. 8, the first plate member 102 and the second plate member 103 having a plurality of frustoconical protrusions 102a and 103a arranged in a staggered manner are connected to both protrusions 102a and 103a. It is also proposed to construct the structural member as a single plate-like member by stacking them so that they do not overlap each other with their tips facing each other, and fastening and bonding the portions of both plate members 102 and 103 that are in contact with each other (See JP-A-11-165448) (third conventional example).
[0005]
In some cases, a square plate is welded to one flat plate to form a bottom plate (fourth conventional example).
[0006]
In addition, as shown in FIG. 9, there is also a structure in which the bottom plate 5 is configured by overlapping and welding two metal plates 5a and 5b which are greatly drawn on the entire surface (fifth conventional example).
[0007]
[Problems to be solved by the invention]
By the way, office equipment such as current image forming apparatuses and various electrical equipment such as communication equipment are required to be smaller, lighter, higher in image quality and lower in cost in addition to higher functionality. As a housing frame, a thin and lightweight structure is required.
[0008]
However, if you try to satisfy the above requirements by making the casing frame thin, there will be a problem that the mechanical strength of the casing frame will decrease, and when the equipment body is installed on an uneven installation surface etc. Since the entire housing frame is twisted and deformed, the internal components attached to the housing frame are inclined.
[0009]
Therefore, today, in addition to the above demand, a high-strength frame and a long-life frame have become necessary.
[0010]
The following problems arise when the demand is not satisfied in a printer or a copying machine.
[0011]
(1) Deterioration of paper conveyance performance (2) Image displacement (3) Image quality degradation (4) Cracking of each part due to distortion of the casing, that is, reduction of the life of the main body (5) Today the casing parts are recital as they are However, in order to deal with such problems due to the occurrence of cracks, it has been considered difficult to increase the thickness, weight and cost of the housing frame.
[0012]
Therefore, in the first and second conventional examples, the performance is not satisfied today in the above points.
[0013]
In order to avoid the above problem, in the third and fifth conventional examples, the drawing process is performed to increase the strength, but the number and area of the deformed portions occupy a large proportion of the original undeformed surface. It was difficult to maintain the flatness of the entire bottom plate.
[0014]
In the fourth conventional example, since many members are welded, residual stress due to welding is generated, and it is difficult to maintain the flatness of the entire bottom plate.
[0015]
Therefore, in the third, fourth and fifth conventional examples, when the electric device is installed on a flat floor, the flatness of the bottom plate is low, and the rigidity of the bottom plate is high, so the entire electric device is attached with a grat, The image of degrading could be invited.
[0016]
The present invention has been made in view of the above problems, and the purpose of the invention is to increase the strength and rigidity of the bottom plate while reducing the thickness and weight of the bottom plate, and torsion due to unevenness on the installation surface of the electrical equipment. An object of the present invention is to provide a housing frame for an electric device that can prevent deformation and ensure high flatness over the entire bottom plate.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a housing frame of an electrical device including at least a side plate, a support column, a top plate, and a bottom plate, and includes a first member and a lower surface constituting the upper surface of the bottom plate. The edges of the first member and the second member are formed in a bowl shape to form a flat portion and a wall portion on both members, respectively, and the first member and the second member are hollow inside In the housing frame of the electrical equipment that is overlapped in a box shape and joined by the wall surfaces of each other,
Only one of the first member and the second member is provided with a plurality of deformed portions deformed into a frustum shape so as to protrude toward the hollow direction of the bottom plate at a plurality of positions of the flat portion, and the apex portion of each deformed portion is provided on the other side. And a deforming portion is disposed on the diagonal line and the four sides of the flat surface portion .
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0022]
FIG. 5 is a cross-sectional view of an image forming apparatus provided with a housing frame according to the present invention. The image forming apparatus includes an optical system 10, a photosensitive drum 11, a primary charger 12, a developing device 13, and a transfer / separation charger. 14, a cleaning device 15, a transport device 16, a fixing device 17, a paper feed cassette 18 and the like are arranged.
[0023]
1 is a front view of a housing frame 100 of the image forming apparatus, and FIG. 2 is a right side view of the housing frame 100. The housing frame 100 is formed into a rectangular parallelepiped shape as a whole, and includes a front plate 1 and a rear plate 2. , Support column 3, top plate 4, bottom plate 5, stay 6 and reinforcing plate 7.
[0024]
The front plate 1, the rear plate 2, the top plate 4, the bottom plate 5, the stay 6 and the reinforcing plate 7 are made of sheet metal obtained by plastic processing of a metal plate, and the column 3 is a member formed by bending a metal pipe or a plate material into a pipe shape. It consists of
[0025]
Here, the detail of the structure of the baseplate 5 is demonstrated based on FIG.3 and FIG.4. 3 is a sectional view of the bottom plate 5, and FIG. 4 is a bottom view of the bottom plate 5.
[0026]
The bottom plate 5 includes a first member 102 that forms an upper surface and a second member 103 that forms a lower surface. Both the first member 102 and the second member 103 have edge portions 104 and 105 that are edge-shaped. Has been.
[0027]
The first member 102 and the second member 103 are fitted into each other, and both are joined and integrated by welding at the side surface welded portion 108 shown in FIGS. In the present embodiment, the first member 102 is fitted outside so as to cover the second member 103, but this relationship may be reversed. Moreover, you may couple | bond the 1st member 102 and the 2nd member 103 by other methods, such as crimping processing, screwing, other than welding. When the first member 102 and the second member 103 are coupled by caulking, it is necessary to process the projecting portion 110 generated by caulking so as not to protrude from the flat portion of the bottom plate 5 as shown in FIG.
[0028]
By the way, as shown in FIG. 3, a plurality of drawn portions 101 drawn in a truncated cone shape are disposed on the flat portion 107 of the second member 103. The height of each throttle part 101 is set to a value at which the apex part 109 abuts against the back side of the flat part 106 of the first member 102.
[0029]
As shown in FIG. 4, casters 111 for moving the image forming apparatus main body are attached to the second member 103 at the four corners, respectively, and the drawn portion 101 drawn into a truncated cone shape on the second member 103 is provided. In addition to being arranged diagonally toward the casters 111 at the four corners, the diaphragm portions 101 are similarly arranged on the four sides of the second member 103.
[0030]
Thus, the rigidity and mechanical strength of the second member 103 alone can be increased by arranging the truncated conical throttle portions 101 in the four sides and diagonal lines of the second member 103 as described above.
[0031]
In addition, since the first member 102 and the second member 103 are coupled to each other in the truncated conical throttle portion 101 arranged on the second member 103, the sectional modulus of the entire bottom plate 5 can be dramatically increased. Thus, the rigidity and mechanical strength of the entire bottom plate 5 can be significantly increased.
[0032]
Furthermore, the strength of the flat surface portion 106 of the first member 102 is increased by disposing the truncated conical portion 101 at the location of the second member 103, so that it is necessary for the image forming apparatus on the first member 102. Even if each unit or component is placed directly, the first member 102 is less likely to be distorted.
[0033]
By the way, when the bottom plate 5 is constituted by the first member 102 alone, it is very difficult to secure a high flatness in the bottom plate 5, but the first member 102 and the second member 5 as in the present embodiment. If the member 103 is integrated with the above method to form the bottom plate 5, the displacement of the bottom plate 5 becomes extremely small, and high flatness can be secured in the bottom plate 5. In this connection, by disposing the truncated conical portion 101 on the second member 103 as described above, the rigidity and strength of the bottom plate 5 are increased as compared with the case where the entire second member 103 is subjected to a frustoconical drawing process. Thus, the displacement of the bottom plate 5 can be kept small, and as a result, a high flatness can be ensured in the bottom plate 5.
[0034]
Since the mechanical strength of the housing frame 100 is mainly secured by the strength of the bottom plate 5, if the strength of the bottom plate 5 is improved, the strength of the entire housing frame 100 is also improved.
[0035]
Therefore, in the present embodiment, the strength and rigidity of the entire housing frame 100 can be improved by providing the throttle portion 101 with respect to the bottom plate 5 and increasing the strength and rigidity of the bottom plate 5 as described above.
[0036]
Further, when the image forming apparatus main body using the housing frame 100 is installed on an uneven installation surface and a torsional load is applied to the housing frame 100, the housing frame 100 is deformed. It is possible to prevent many problems occurring in the image forming apparatus due to the deformation of the housing frame 100.
[0037]
In the present embodiment, the diaphragm 101 is provided on the second member 103 so that it cannot be seen by general users from the viewpoint of design, but the first member 102 and the second member 103 are reversed. However, the same effect as described above can be obtained.
[0039]
Furthermore, in the present embodiment, the bottom plate 5 is made of sheet metal. However, the bottom plate 5 may be made of plastic, and in the case of being made of plastic, the throttle portion of the bottom plate 5 is used when the bottom plate 5 is molded from plastic. Of course, it can be formed into a desired shape depending on the shape of the mold.
[0040]
Further, in the present embodiment, the shape of the aperture 101 is a truncated cone, but a similar shape such as a semi-spherical shape or a square shape may be employed.
[0041]
By the way, in the present embodiment, the embodiment in which the present invention is applied particularly to the housing frame of the image forming apparatus has been described. However, the present invention can be similarly applied to the housing frame of any other electrical device. is there.
[0042]
【The invention's effect】
As is apparent from the above description, according to the present invention, a housing frame of an electrical apparatus including at least a side plate, a support column, a top plate, and a bottom plate, the first member constituting the upper surface of the bottom plate And the second member constituting the lower surface, the edges of the first member and the second member are formed in a bowl shape to form a flat portion and a wall portion on both members, respectively, and the first member and the second member In a housing frame of an electric device that overlaps with each other on the wall surface of each other by overlapping in a box shape so that the inside becomes a hollow,
Only one of the first member and the second member is provided with a plurality of deformed portions deformed into a frustum shape so as to protrude toward the hollow direction of the bottom plate at a plurality of positions of the flat portion, and the apex portion of each deformed portion is provided on the other side. In addition to providing a coupling portion to be coupled to the flat portion, the deforming portion is disposed on the diagonal line and the four sides of the flat surface portion , thereby increasing the strength and rigidity of the bottom plate while reducing the thickness and weight of the bottom plate. It is possible to obtain an effect that high flatness can be ensured in the entire bottom plate by preventing deformation due to torsion due to unevenness of the installation surface.
[Brief description of the drawings]
FIG. 1 is a front view of a housing frame according to the present invention.
FIG. 2 is a right side view of a housing frame according to the present invention.
FIG. 3 is a cross-sectional view of a bottom plate of a housing frame according to the present invention.
FIG. 4 is a bottom view of a bottom plate of a housing frame according to the present invention.
FIG. 5 is a cross-sectional view of an image forming apparatus including a housing frame according to the present invention.
FIG. 6 is a perspective view of a conventional housing frame.
FIG. 7 is a perspective view of a bottom plate of a conventional housing frame.
FIG. 8 is an exploded perspective view of a bottom plate of a conventional housing frame.
FIG. 9 is an exploded perspective view of a bottom plate of a conventional housing frame.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front side plate 2 Rear side plate 3 Support | pillar 4 Top plate 5 Bottom plate 6 Stay 7 Reinforcement plate 100 Case frame 101 Restriction part (deformation part)
102 First member 103 Second member 104 First member edge 105 Second member edge 106 First member flat surface 107 Second member flat surface 108 Side welded portion 109 Constriction portion (deformation portion) vertex 110 Convex part by caulking

Claims (2)

A housing frame of an electric device configured to include at least a side plate, a support column, a top plate, and a bottom plate, and includes a first member that constitutes an upper surface of the bottom plate and a second member that constitutes a lower surface. The edges of the member and the second member are formed in a bowl shape to form a flat portion and a wall portion on both members, respectively, and the first member and the second member are overlapped in a box shape so that the inside becomes a hollow and is mutually attached. In the housing frame of the electrical equipment to be coupled with the wall surface of the wall,
Only one of the first member and the second member is provided with a plurality of deformed portions deformed into a frustum shape so as to protrude toward the hollow direction of the bottom plate at a plurality of positions of the flat portion, and the apex portion of each deformed portion is provided on the other side. A housing frame for an electric device, characterized in that a coupling portion that couples to a flat surface portion is provided on the diagonal line and four sides of the flat surface portion.   The housing frame for an electric device according to claim 1, wherein at least the bottom plate is made of a resin material.

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