JPH1117865A - Image forming device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the shaking of a frame structure at the time of image reading scanning, eliminate the shaking of the apparatus main body, and improve the commercial value. SOLUTION: A horizontal frame member 81 arranged in a direction orthogonal to the scanning direction of the optical scanning device is formed in a U-shape in cross section, and both opposing side surfaces 81a and 81b are extended as they are, and are protruded from the ends to form joining pieces a. B is formed, and through holes a and b for welding are formed in two stages in one of the joining pieces a. On the other hand, the vertical frame member 74 is formed in a rectangular cross section. Then, while adjusting the distance c to an appropriate interval, the joining pieces a and
b, and the weld metal 100 is poured into the through holes a and b to perform plug welding, and the weld metal 101 is poured and welded between the tip of the joint piece b and the vertical framing member 74 to form the horizontal framing member 81. Link.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile, and a multifunction peripheral thereof. Specifically, among such image forming apparatuses, an image forming apparatus of a type in which a frame structure of an apparatus main body is formed by combining vertical and horizontal frame members, and an image scanning optical scanning device is supported by the frame structure. May be applied.

[0002]

2. Description of the Related Art In a conventional image forming apparatus, as described in, for example, JP-A-6-175419, a frame structure of an apparatus main body is formed by combining vertical and horizontal frame members. There is a device that supports an image reading optical scanning device.

In this type of image forming apparatus, the vertical and horizontal frame members are formed in a U-shaped cross section, and the opposite side surfaces of the horizontal frame member project from the ends to form a joint piece. The vertical frame members were inserted and welded to connect the horizontal frame members and the vertical frame members.

[0004]

However, in such a conventional image forming apparatus, in order to improve the continuous image reading speed, the moving body in the optical scanning device moves faster on the return path than on the outward path and suddenly moves at the turning position. Reciprocating at high speed while decelerating. For this reason, there has been a problem that the frame structure swings at the time of image reading scanning, for example, the operation unit provided on the front of the apparatus main body swings right and left, thereby lowering the commercial value.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the commercial value of the above-described image forming apparatus by reducing the swing of the frame structure during image reading scanning and eliminating the swing of the apparatus main body.

[0006]

Therefore, according to the first aspect of the present invention, as shown in FIG. 6, for example, vertical and horizontal frame members 68 to 81 are combined to form a frame structure 65 of the apparatus body 10, and In an image forming apparatus such as a laser copying machine which supports the image reading optical scanning device 35 with the frame structure 65, a horizontal frame arranged in a direction orthogonal to the scanning direction A of the optical scanning device 35 shown in FIG. The member 81 is formed in a U-shaped cross section or a U-shaped cross section as shown in FIG. 1, and the opposite side surface portions 81a and 81b are protruded from the end portions to form joining pieces a and b.
Is formed into a tubular shape having a rectangular cross section, for example, inserted between the joint pieces a and b and welded by spot welding, plug welding, or the like, and the horizontal frame member 81 and the vertical frame member 74 are connected. It is characterized by that.

The second moment of area is increased by forming the vertical frame member 74 into a cylindrical shape.

According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the joining pieces a and b are bent by bending the joining pieces a and b as shown in FIG. The distance L between them is changed.

Then, the joint pieces a and b are bent so that the distance L between the joint pieces a and b matches the outer shape of the vertical frame member 74.

According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect, for example, as shown in FIGS. -It is characterized by leaving a hole.

Then, a welding metal is poured into the through holes a and b and welded to connect the horizontal frame member 81 and the vertical frame member 74.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 is a schematic configuration diagram showing the internal mechanism of the laser copying machine according to the present invention as viewed from the front side.

Reference numeral 10 in the figure denotes a copying machine main body. The apparatus main body 10 includes a main body mounting table 1 with casters 11.
2 and an automatic document feeder 13 is mounted on the upper surface so as to be freely opened and closed.

First, the apparatus main body 10 is provided with a paper feed tray 16 on the right side of a box-shaped exterior cover 15 covering the periphery so as to be openable and closable, and a discharge tray 17 on the left side so as to be detachably attached.

A drum-like photosensitive member 20 is provided in the outer cover 15 slightly in the center and slightly to the right in the drawing. Around the photoreceptor 20, a charging device 21, a developing device 22, a transfer device 23, a cleaning device 24, and the like are sequentially provided in the rotation direction (clockwise direction in the figure). Further, on the left side of the photoconductor 20 in the figure, the fixing device 2
6 is provided.

A paper feed path 28 is formed in the exterior cover 15 so as to bend from the bottom right of the photoconductor 20 to the transfer device 23. A manual paper feed path 30 is formed so as to join the paper feed path 28 from the attachment position of the paper feed tray 16 toward the same.

On the other hand, on the left side of the fixing device 26 in the figure, a paper discharge path 31 is formed toward the mounting position of the paper discharge tray 17.
Then, from the middle of the paper discharge path 31 to the middle of the paper feed path 28, a switchback transport path 32 for double-sided recording is formed under the fixing device 26, the paper transport device 25, and the transfer device 23. .

In addition, inside such an outer cover 15,
An optical scanning device 35 for reading an image is provided on the upper part. The optical scanning device 35 includes a contact glass 37 on the top surface of the housing 36.
And the contact glass 37 is attached to the exterior cover 15.
It is installed facing the outside through a window provided on the top surface. A light source 38 and a mirror 39 are provided in the housing 36 by being appropriately mounted on a moving body.
1 and three mirrors 42, 43 and 44 are fixedly arranged.

On the other hand, the main body mounting table 12 is provided with a plurality of paper cassettes 46, 47, 48, and 49 of various sizes in a box-shaped outer cover 45 having casters 11 attached to the four corners of the bottom surface. Paper feeders 50, 51, 52 and 53 for feeding out the paper in the paper cassette, respectively;
Also, the paper sent out by each of these paper feeders is transferred to the apparatus main body 10.
And a paper transport path 54 for feeding the paper toward the paper feed path 28.

Further, in the automatic document feeder 13, the set copy document is transported onto the contact glass 37, and the read copy document is loaded into the contact glass 37.
A transport belt 56 that discharges from above is provided.

When a copy is to be made using this copying machine, a copy document is set on the automatic document feeder 13 and a start switch (not shown) provided on the apparatus main body 10 is pressed to drive the feed belt 56, It is transported to above the contact glass 37.

At the same time, the moving body of the optical scanning device 35 is operated to move the light source 38, the mirror 39, and the mirrors 40 and 41 along the contact glass 37 in the scanning direction indicated by the arrow A, thereby to reflect the reflected light from the copy original. To the lens unit 62. Further, the photosensitive member 20 passes through mirrors 42, 43 and 44.
Image.

At the same time, the sheet feeding devices 50, 51, 52, 53
Of the sheet cassettes 46 and 47
The paper 60 in the paper 48 and 49 is fed out, and the paper transport path 54
By feeding the paper 60 on the paper feed tray 16 into the apparatus main body 10 by driving the manual paper feeder 58 or feeding the paper 60 into the paper feed path 28 via the manual paper feed path 30, Stop against roller pair 29.

On the other hand, when the start switch is pressed and simultaneously, the photosensitive member 20 is rotated clockwise in the drawing, first, the peripheral surface is uniformly charged by the charging device 21, and then, from the mirror 44 by the optical scanning device 35. Photoreceptor 2
Then, light exposure is performed on the surface of the toner image 0, and thereafter, toner in a portion not exposed to light by the developing device 22 is electrostatically adsorbed to form a visible image.

Then, the registration roller pair 29 is rotated in synchronization with the rotation of the photoconductor 20, and the paper 60 abutting against the registration roller pair 29 is directed between the photoconductor 20 and the transfer device 23. Send out.

Then, the toner on the photoconductor 20 is transferred by the transfer device 23 to the paper 60 fed below the photoconductor 20 in accordance with the rotation of the photoconductor 20. Thereafter, the sheet 60 after the transfer is conveyed by the sheet conveying device 25 and enters the fixing device 26, where the transferred image is fixed by the fixing device 26,
The paper is stacked on the paper discharge tray 17 through the paper discharge path 31.

On the other hand, the surface of the photoreceptor 20 after the image transfer is cleaned by removing the residual toner by the cleaning device 24, and then, for example, is discharged by a not-shown discharging device to prepare for the next use.

The outer cover 15 of the apparatus body 10
In order to increase the rigidity of the apparatus main body 10, a main body frame structure 65 as shown in FIG. The main body frame structure 65 supports various devices such as the above-described photoreceptor 20 and the developing device 22, the cleaning device 24, and the fixing device 26 in the device main body 10.

On the other hand, a trapezoidal frame structure 66 as shown in FIG. 6 is provided in the exterior cover 45 of the main body mounting table 12 in order to increase the rigidity of the main body mounting table 12. Then, the sheet feeding device 5 in the main body mounting table 12 is
0, 51, 52, 53, etc.

First, in the main frame structure 65, the base frame members 68, 69, 70 and 71 each having a U-shaped cross section are mounted in a rectangular frame shape with the open side facing inward. Then, a reinforcing base frame member 72 also having a U-shaped cross section is obliquely bridged between the front and rear base frame members 68 and 69.

The base frame members 68, 69, 70,
At the four corners of 71, vertical frame members 73, 74, 75
・ Stand 76. The front two vertical frame members 7
3 and 74 are each formed in a square cross section as described later.
The two vertical frame members 75 and 76 at the rear are formed to be slightly wider in the front-rear direction by providing two U-shaped cross sections. One horizontal frame member 77 having a U-shaped cross section is provided between the distal ends of the front vertical frame members 73 and 74, and the rear vertical frame member 75
76, two horizontal frame members 7 each having a U-shaped cross section
8. 79 are put on each other with the open side facing downward.

A horizontal frame member 80 is disposed between the front ends of the left and right vertical frame members 73 and 75, and a right and left vertical frame member 7 is positioned between the front frame members 73 and 75.
A horizontal frame member 81 is stretched between the distal ends of the four and the four.

In the above-described main body frame structure 65,
Frame members 68, 69, 70, 71, 72, 73, 74
75.76.77.78.79.80.81 are made of, for example, a mild steel plate and are connected to each other by welding such as spot welding and plug welding.

Now, in the middle of the horizontal frame members 80 and 81 of such a main frame structure 65, pins 82.8 are directed upward.
Make 3 Then, they are positioned by the pins 82 and 83, and placed on the horizontal frame members 80 and 81 as shown in FIG. 5, and the front vertical frame members 73 and 74 and the rear vertical frame members 75
The optical scanning device 35 described above is fitted so as to be sandwiched between 76.

Next, as shown in FIG. 6, the trapezoidal frame structure 66 has vertical frame members 86, 87, 88 and 89 each having a U-shaped cross section at four corners of a rectangular plate-like base member 85. The front two vertical frame members 86 and 87 are
The open side is provided rearward, and the transverse frame member 90 is bridged between the distal ends. Further, the two rear vertical frame members 88 and 89 are formed so that their open sides face forward, and a horizontal frame member 91 is bridged between their distal ends. Horizontal frame member 9
0 and 91 are also U-shaped in cross section, and are mounted with their open sides facing each other.

On the other hand, a horizontal frame member 92 having a U-shaped cross section is provided between the front ends of the right and left vertical frame members 87 and 89 with the open side facing downward. In addition, the front horizontal frame member 9
0 and the rear horizontal frame member 91, two horizontal frame members 9
Cross over 3.94. Those transverse frame members 93 and 94
Are mounted in a U-shaped cross section with their open sides facing each other.

In the above-described trapezoidal frame structure 66, the frame members 86, 87, 88, 89, 90, 91, 92.9 are used.
3 and 94 are made of, for example, a mild steel plate, and are connected to each other by welding such as spot welding or plug welding like the main frame structure 65.

In the illustrated example, pins 96 and 97 are erected on both ends of the horizontal frame member 91 of the trapezoidal frame structure 66. Although not shown, engaging holes are formed in the left and right base frame members 70 and 71 of the main frame structure 65. Open. Then, the main body mounting table 12
When the apparatus main body 10 is put on the apparatus main body 10, the pins 96 and 97 are inserted into the engagement holes to accurately position the apparatus main body 10 on the main body mounting table 12.

According to the first aspect of the present invention, the horizontal frame members 80 and 81 arranged in a direction orthogonal to the scanning direction A of the optical scanning device 35 are formed in a U-shaped or U-shaped cross section, and are opposed to each other. While both side parts protrude from the end to form a joint piece, the vertical frame members 73 and 74 are formed in a cylindrical shape,
The horizontal frame members 80 and 81 and the vertical frame members 73 and 74 are connected by welding by inserting between the joint pieces.

For example, as shown in FIG.
5, one of the horizontal frame members 81 arranged in a direction perpendicular to the scanning direction A is formed in a U-shaped cross section, the open side is arranged downward, the opposite side surfaces 81a and 81b are left as they are, and the end portions are extended. The joining pieces a and b are formed so as to protrude further and have an interval L. One of the joining pieces a has a through hole for welding.
Open two rows.

On the other hand, the vertical frame member 74 is formed in a rectangular cross section with a smaller width of M and a larger width of N. In the illustrated example, the smaller width M is made slightly smaller than the distance L between the joining pieces a and b, and the distance c from the end of the horizontal frame member 81 is adjusted to an appropriate distance as shown in FIGS. While being inserted between the joining pieces a and b. Then, the welding metal 100 is poured into the through holes a and b and plug welding is performed, and the welding metal 101 is poured and welded between the tip of the joint piece b and the vertical framing member 74 to be connected to the horizontal framing member 81.

As described above, when the vertical frame member 74 is formed in a rectangular shape in cross section, the second moment of area is increased to increase the rigidity of the main frame structure 65, which hinders maintenance and installation of peripheral devices. For example, when the moving body in the optical scanning device 35 moves at the time of image reading scanning, the shaking of the main body frame structure 65 is reduced, and the shaking of the device main body 10 is eliminated without making the welding difficult. Can be improved.

In FIGS. 1 to 3, the assembly of the horizontal frame member 81 and the vertical frame member 74 has been described. However, in the illustrated example, the horizontal frame member 80 and the vertical frame member 73 are similarly assembled. Here, in the illustrated example, the horizontal frame members 80 and 81
Is formed in a U-shaped cross section, and the opposite side surfaces are similarly protruded from the ends to form joint pieces, and vertical frame members 73 and 74 are inserted between the joint pieces. May be welded.

In the illustrated example, the smaller width of the vertical frame member 74 is arranged in the scanning direction A of the optical scanning device 35. However, the longer width may be arranged in the scanning direction A. By doing so, it is possible to further reduce the swing of the main body frame structure 65 during image reading scanning.

According to the second aspect of the present invention, the joining pieces a and b
Is bent to change the distance between the joining pieces a and b. For example, as shown in FIG. 4, one joint piece b is bent to reduce the distance between the two joint pieces, and the width L is slightly larger than the smaller width M of the vertical frame member 74 in accordance with the outer shape of the vertical frame member 74. And

As described above, by changing the distance between the joint pieces a and b, welding can be further facilitated in accordance with the outer shape of the vertical frame member 74. In addition, the width of the vertical and horizontal frame members can be changed to provide diversification.

According to the third aspect of the present invention, the joining pieces a and b
Drill holes for welding. For example, as shown in FIG. 1 to FIG. 3, through holes a and b for welding are provided in the joint piece a in two stages, a welding metal 100 is poured into the through holes a and b, and plug welding is performed. The member 81 and the vertical frame member 74 are connected.

As described above, the weld metal 10 is provided in the through holes a and b.
By pouring and welding 0, the horizontal frame member 81 and the vertical frame member 74 can be easily and reliably connected.

[0049]

Therefore, according to the present invention, since the vertical frame member is formed in a rectangular cross section, the second moment of area is increased to increase the rigidity of the main frame structure, and is used for maintenance and attachment of peripheral devices. Without hindrance and without making welding difficult, for example, when the moving body in the optical scanning device moves at the time of image reading scanning, the shaking of the frame structure is reduced, and the shaking of the device body is eliminated. Value can be improved.

According to the second aspect of the present invention,
By changing the distance between the two joint pieces, welding can be further facilitated in accordance with the outer shape of the vertical frame member.
In addition, the width of the vertical and horizontal frame members can be changed to provide diversification.

According to the third aspect of the present invention,
Since the welding metal is poured into the through hole and welded, the horizontal frame member and the vertical frame member can be easily and reliably connected.

[Brief description of the drawings]

FIG. 1 is an end plan view of one horizontal frame member and one vertical frame member used in the main frame structure shown in FIG. 6 before assembly.

FIG. 2 is an end plan view after the assembly.

FIG. 3 is a front view thereof.

FIG. 4 is an end plan view of a lateral frame member used in another example.

5 is a perspective view showing an optical scanning device attached to the main frame structure shown in FIG. 6;

6 is a perspective view of a main frame structure provided in the apparatus main body of the laser copying machine shown in FIG. 7, and a trapezoid frame structure provided in the main body mounting table.

FIG. 7 is a schematic configuration diagram showing an internal mechanism of the laser copying machine according to the embodiment of the present invention as viewed from the front side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Device main body 35 Optical scanning device for image reading 65 Main frame structure 68 to 81 Vertical and horizontal frame members 81a and 81b Both side surfaces of a horizontal frame member A Scanning direction of an optical scanning device a, b Joining piece L Distance between both joining pieces I-Ro Welding holes for welding

Claims (3)

[Claims] 1. An image forming apparatus in which a frame structure of an apparatus main body is formed by combining vertical and horizontal frame members, and the frame structure supports an optical scanning device for reading an image. The transverse frame member arranged in the direction to be formed is formed in a U-shape or a rectangular shape in cross section, and the opposite side surfaces are projected from the end to form a joint piece, while the vertical frame member is formed in a tubular shape, and the joint piece is formed. Weld in between and weld,
An image forming apparatus comprising the horizontal frame member and the vertical frame member connected to each other. 2. The image forming apparatus according to claim 1, wherein the joining piece is bent to change a distance between the joining pieces. 3. The image forming apparatus according to claim 1, wherein a through hole for welding is formed in the joint piece.