JP2002043767A - Box-type frame for electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box-type frame for an electronic apparatus which can ensure high framing accuracy and high rigidity. SOLUTION: This box-type frame 1 is formed by clinching four corners of a plate on the square to form four sidewalls 2, 3, 4 and 5, and setting positioners (pins 6 and positioning notches 7) on adjacent sidewalls 2 and 5, 4, and the sidewalls 3 and 4, 5 to fit in each other. According to this invention, since the box-type frame 1 is formed as an unitized body by forming the four sidewalls 2 to 5 by clinching the plate, welding points are reduced, thereby the influence due to thermal distortion is relieved, and rigidity of the box-type frame is increased. Additionally, as positioners are set in the box-type frame itself, positioning operation becomes simple, and positioning accuracy is enhanced, and moreover, dispersion of working accuracy is eliminated, thereby the framing accuracy of box-type frame 1 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box-shaped frame such as a scanner box provided in an electronic device such as an electrophotographic copying machine.

[0002]

2. Description of the Related Art For example, an electrophotographic copying machine is provided with a scanner box for accommodating a scanner as image reading means. A box-shaped frame such as the scanner box has three parts 101, 102, and 103 shown in FIG. 103
Was assembled by welding.

[0003] A box-shaped frame such as a scanner box is composed of a part 101 formed by bending a metal plate into a U-shaped cross section and two left and right parts 102 formed by bending a metal plate into an inverted L-shaped cross section. , 103, two parts 102, 103 are applied to cover the left and right openings of the part 101 while positioning the parts 101-103 by a jig (not shown), and the parts 101-103 are welded to each other. The box frame was assembled by joining.

[0004]

By the way, as shown in FIG. 10, in a conventional box-shaped frame constituted by welding three parts 101 to 103, each of the parts 101 to 101 is formed.
Although the accuracy as a single item of No. 3 is maintained at a high level, it is difficult to maintain the accuracy after assembling the components 101 to 103 at a high level. That is, it is necessary to position each of the components 101 to 103 with a jig, and since the number of welding points is large and thermal distortion is easily generated in each of the components 101 to 103,
It has been difficult to maintain high accuracy as a box-shaped frame after assembling the parts 101 to 103.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a box frame for an electronic device which can ensure high assembly accuracy and high rigidity.

[0006]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, four corners of a sheet metal are bent at right angles to form four peripheral walls, and adjacent peripheral walls are fitted with positioning portions fitted to each other. Are provided to form a box-type frame for electronic equipment.

According to a second aspect of the present invention, in the first aspect of the present invention, the positioning portion comprises a positioning groove formed on one of the adjacent peripheral walls and a projection protruding on the other. It is characterized by.

Therefore, according to the present invention, since the box-shaped frame is integrally formed by bending one sheet metal to form four peripheral walls, the number of welding points is reduced and the influence of thermal distortion is reduced. In addition, the rigidity of the box-shaped frame is increased, and the positioning portion is provided on the box-shaped frame itself, so that the positioning operation is simplified, the positioning accuracy is increased, and the variation in the processing accuracy is reduced. It is absorbed and the assembling accuracy of the box-shaped frame is increased.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a box frame for an electronic device according to the present invention, and FIGS. 2 to 5 are views for explaining a manufacturing process of the box frame.

A box-shaped frame 1 shown in FIG. 1 is a scanner box of an electrophotographic copying machine. This box is formed by bending four corners of a sheet metal at right angles to form front, rear, left and right peripheral walls 2, 3, 4, and 5, and each peripheral wall. The flanges 2a, 3a, 4a, 5a are formed by bending the edges 2 to 5 inward at right angles, and the flanges 2a, 4a, 5a and the flanges 3a, 4a, 5a A positioning portion composed of a fitting pin 6 and a positioning groove 7 is provided, and adjacent peripheral walls 2, 4 and 5, peripheral walls 3, 4 and 5, and a flange portion 2
a and 4a and 5a, and the flange portions 3a and 4a and 5a are formed into a box shape by spot welding.

Next, a manufacturing process of the box-shaped frame 1 having the above configuration will be described with reference to FIGS.

In manufacturing the box frame 1, first,
A sheet metal 1A having a cross shape shown in FIG. 2 is manufactured by cutting an iron plate or the like. The sheet metal 1A has a rectangular flat portion surrounded by chain lines a, b, c, and d (the bottom surface of the box-shaped frame 1). ) And four rectangular pieces 2 ′, 3 ′, 4 ′, and 5 ′ (portions forming the peripheral walls 2 to 5) formed around the plane portion 1a. , Each rectangular piece 3 '
５5 ′, the band-like portions (portions constituting the flange portions 2a to 5a) divided by chain lines e, f, g, h
a ', 3a', 4a ', and 5a' are provided. still,
The four corners of the flat portion 1a of the sheet metal 1A (the bases of the adjacent rectangular pieces 2 ', 4', 5 'and the rectangular pieces 3', 4 ', 5') are used to avoid interference during bending. Notches 1b as escape grooves are respectively formed.

The pins 6 are provided on the left and right sides of the back surfaces (in the state shown in FIG. 2) of the band-shaped portions 2a ', 3a' of the rectangular pieces 2 ', 3' constituting the front and rear peripheral walls 2, 3 respectively. The rectangular notch-shaped positioning grooves 7 for fitting the pins 6 are formed before and after the band-shaped portions 4a ', 5a' of the rectangular pieces 4 ', 5' forming the left and right peripheral walls 4, 5 respectively. Have been.

In the sheet metal 1A shown in FIG. 2, the strips 2a 'to 5a' of the rectangular pieces 2 'to 5' are shown in FIG. 3 along the dashed lines e, f, g, h shown in FIG. After being bent inward at right angles to form the flange portions 2a to 5a shown in FIG. 1, the front and rear rectangular pieces 2 'and 3' are formed along chain lines a and b (see FIG. 2) as shown in FIG. Along the arrow direction shown above (upward)
And the front and rear peripheral walls 2 and 3 are formed
Flanges 2a, 3a extend horizontally inward at the upper ends of the peripheral walls 2, 3, and the pins 6
Respectively protrude.

When the front and rear peripheral walls 2 and 3 are formed as described above, the left and right rectangular pieces 4 'and 5' are drawn along the chain lines c and d (see FIG. 2) as shown in FIG. The right and left peripheral walls 4 and 5 are formed by being bent at right angles in the direction (upward), and flange portions 4 a and 5 a extend horizontally inward at the upper ends of the peripheral walls 4 and 5. The positioning grooves 7 are opened before and after, respectively.

When the left and right rectangular pieces 4 'and 5' are bent to form the left and right peripheral walls 4 and 5, as shown in detail in FIG. 6, the left and right rectangular pieces (the left rectangular piece in FIG. 4 '
Only the positioning groove 7 formed in the flange portion 4a (5a) of 4 '(5') is fitted to the pin 6 protruding from the flange portions 2a, 3a of the front and rear peripheral walls 2, 3. The flanges 2 of the front and rear peripheral walls 2 and 3 are inserted into positioning grooves 7 formed in the flanges 4 a and 5 a of the left and right peripheral walls 4 and 5.
a, 3a are fitted with pins 6 projecting therefrom, and positioning grooves 7
The left and right peripheral walls 4, 5 are pressed against the end faces of the adjacent front and rear peripheral walls 2, 3 while maintaining the state in which the pin 6 is pressed against the back 7a, and the flange portions 4a, 5a and the left and right peripheral walls 4, 5 are pressed.
5 for several points (in this embodiment, four flanges,
A box-shaped frame (scanner box) 1 shown in FIG. 1 is obtained by spot welding the flange portions 2a, 3a and the front and rear peripheral walls 2, 3 at a total of 12 points.

The distance between the front and rear peripheral walls 2 and 3 after assembly (the perpendicularity of each peripheral wall 2 and 3) is determined by the pin 6
The distance between the left and right peripheral walls 4 and 5 is maintained with high precision (that is, the distance between the left and right peripheral walls 4 and 5 is maintained with high precision).
The pin 6 protruding from the left and right flanges 4a and 5a is maintained with high accuracy by abutting against the depth 7a of the positioning groove 7 formed in the left and right flanges 4a and 5a (that is, the pin 6 is managed with high precision by the distance between the two positioning pins 6) Is done).

As described above, the box-shaped frame (scanner box) 1 according to the present embodiment is integrally formed by bending one sheet metal 1A to form four front, rear, left and right peripheral walls 2 to 5. Therefore, the number of welding points is reduced, the influence of thermal strain is reduced, and the rigidity of the box-shaped frame 1 is increased. The number of welding points is 18 points (four flanges, 8 peripheral walls, 8 points). It was reduced from 12 points (4 points on the flange and 8 points on the peripheral wall) from 6 points on the flat part.

Further, since the box-shaped frame 1 itself is provided with a positioning portion including the pin 6 and the positioning groove 7, the positioning operation is simplified and the jig is also simplified.
Positioning accuracy is enhanced, and variations in processing accuracy are absorbed, and assembling accuracy of the box frame 1 is enhanced.

In this embodiment, as shown in FIG. 7A, the pins 6 projecting from the flange portions 2a, 3a of the front and rear peripheral walls 2, 3 and the flange portions 4a of the left and right peripheral walls 4, 5 are provided. , 5
and a positioning groove 7 formed in a.
Although the configuration in which the positioning groove 7 is fitted to the pin 6 is adopted,
As shown in FIG. 7 (b), pins 6 protrude from the lower surfaces of the flanges 4a and 5a of the left and right peripheral walls 4 and 5, and the front and rear peripheral walls 2 and 3 are provided.
A configuration may be adopted in which the positioning grooves 7 are formed in the flange portions 2a and 3a, and the pins 6 are fitted into the positioning grooves 7.

Further, as shown in FIG.
Cylindrical projections 6 'formed integrally with the flange portions 2a, 3a by burring and round holes 7' or rectangular holes 7 "formed in the flange portions 4a, 5a of the left and right peripheral walls 4, 5. A configuration may be adopted in which the positioning portion is formed and the protrusion 6 'is fitted into the round hole 7' or the rectangular hole 7 "as shown in FIG. 9A. In this case, as shown in FIG.
Protrusions 6 'project downward from the flange portions 4a and 5a of the left and right peripheral walls 4 and 5 by burring, and round holes 7' or rectangular holes 7 "are formed in the flange portions 2a and 3a of the front and rear peripheral walls 2 and 3. And the two may be fitted together.

In the above, the embodiment in which the present invention is applied to a scanner box of an electrophotographic copying machine has been described. However, the present invention can be similarly applied to a box frame of any other electronic equipment. Of course.

[0024]

As is apparent from the above description, according to the present invention, the four corners of the sheet metal are bent at right angles to form four peripheral walls, and the adjacent peripheral walls are provided with positioning portions for fitting with each other to provide electronic components. Since the box-shaped frame for the device is configured, an effect that a high assembling accuracy and a high rigidity can be secured to the box-shaped frame is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a box frame (scanner box) for an electronic device according to the present invention.

FIG. 2 is a plan view illustrating a manufacturing process of the box frame for an electronic device according to the present invention.

FIG. 3 is a plan view illustrating a manufacturing process of the box frame for an electronic device according to the present invention.

FIG. 4 is a plan view illustrating a manufacturing process of the box frame for an electronic device according to the present invention.

FIG. 5 is a perspective view illustrating a manufacturing process of the box frame for an electronic device according to the present invention.

FIG. 6 is a partial perspective view for explaining a manufacturing process of the box frame for an electronic device according to the present invention.

FIG. 7 is a partial sectional view showing a form of a positioning unit.

FIG. 8 is a partial perspective view showing another embodiment of the box frame for electronic equipment according to the present invention.

FIG. 9 is a partial cross-sectional view showing another form of the positioning section.

FIG. 10 is an exploded perspective view showing a configuration of a conventional box frame.

[Description of Signs] 1 Box type frame 2-5 Peripheral wall 2a-5a Flange part 6 Pin (projection) 6 'Projection 7 Positioning groove 7' Round hole 7 "Rectangular hole

Claims (2)

[Claims] 1. A box-shaped frame for electronic equipment, wherein four corners of a sheet metal are bent at right angles to form four peripheral walls, and adjacent peripheral walls are provided with positioning portions for fitting each other. 2. The box frame for an electronic device according to claim 1, wherein the positioning portion comprises a positioning groove formed on one of adjacent peripheral walls and a projection protruding from the other.