JP4150177B2 - Scanner frame fastening structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a copying machine of a type provided with a discharge section for discharging a sheet on which an image is copied, directly below a scanner section for reading an image of a document, and in particular, a substantially rectangular scanner frame disposed above a main body frame. The present invention relates to a fastening structure of a scanner frame that fastens the frame to the main body frame.
[0002]
[Prior art]
In order to make it easier to take out the paper discharged to the discharge unit, in a copying machine of the type provided with a discharge unit for discharging the sheet on which the image is copied, directly below the scanner unit that reads the image of the document, FIG. As described above, with respect to the right side portion of the discharge portion S in the main body frame 100 as viewed from the normal operation position, the frame 101 is provided on the back side to form a paper take-out space 102 on the front side. From this relationship, the right side of the scanner frame 103 provided in the scanner unit is attached to and supported by the main body frame 100 on the back side of this portion.
[0003]
In that case, conventionally, as shown in FIGS. 7 and 8, the right side of the scanner frame 103 is placed on the upper side of the main body frame 100 and the bottom plate 104 of the scanner frame 103 and the main body frame 100. The flange 105 that contacts the bottom plate 104 is fastened by a fastening member 106 such as a screw.
[0004]
[Problems to be solved by the invention]
However, in the conventional fastening structure as described above, since the right side plate 107 of the scanner frame 103 is separated from the fastening position, when a load is applied to the scanner frame 103 from above, the scanner frame 103 is supported by the frame 100. The portion 108 on the right side that is not right sinks downward due to the load, while the back side of the right side plate 107 of the scanner frame 103 floats upward as shown in FIG. 9, and the scanner frame 103 is twisted and deformed. Sometimes. Since the scanner frame 103 is equipped with a mirror or CCD that requires positional accuracy, when the scanner frame 103 is deformed as described above, the mounting position of these members is shifted, which affects the image reading accuracy. There is a fear.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above, and in a copier of a type provided with a discharge unit for discharging a sheet on which an image is copied, directly below a scanner unit for reading an image of a document, a scanner frame provided in the copier An object of the present invention is to provide a scanner frame fastening structure capable of suppressing the deformation of the scanner frame.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a substantially rectangular scanner frame is fastened to the main body frame above a paper discharge space formed by surrounding a side other than the near side where a paper take-out space is formed. A fastening structure for
One of the left and right side plates of the scanner frame or the one of the left and right side plates of the main body frame, which are arranged on substantially the same plane, is integrated with a connecting portion parallel to the side plate of the other frame to be fastened. The scanner frame and the main body frame are fastened by extending and connecting the connecting portion in close contact with the side plate of the other frame .
[0007]
According to this invention, the fastening structure for fastening the substantially rectangular scanner frame to the main body frame above the paper discharge space formed by surrounding the side other than the front side where the paper take-out space is formed. A connecting portion parallel to the side plate of the other frame to be fastened to one side plate of the left and right side plates of the scanner frame or one side plate of the left and right side plates of the main body frame disposed on substantially the same plane Since the scanner frame and the main body frame are fastened by attaching the connecting portion in close contact with the side plate of the other frame, the side plate of the scanner frame has a large rigidity in the vertical direction. It is fixed by the side plate of the main body frame. Therefore, when this fastening structure is applied to fastening the side plate of the scanner frame and the side plate of the main body frame adjacent to a part of this side plate, the above-mentioned adjacent portion is lifted by a load from above compared to the conventional fastening structure. And subduction of parts other than adjacent parts are suppressed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, after describing an overall configuration of an embodiment in which the present invention is applied to a copying machine, characteristic portions of the present invention will be described.
[0009]
FIG. 1 is a perspective view showing an external configuration of the copying machine 1, and FIG. 2 is a schematic diagram showing a schematic configuration of the copying machine 1. In the following description, the front side of the copying machine 1 viewed from the normal operation position (as viewed from the direction of arrow A in FIG. 1) is referred to as the front side of the copying machine.
[0010]
As shown in FIG. 1, the copying machine 1 includes an apparatus main body 2 and a document presser 3 that is mounted on the upper portion of the apparatus main body 2 so as to be freely opened and closed. The apparatus main body 2 is partitioned by a main body housing 4 and an upper housing 5 mounted on the upper portion of the main body housing 4, and a sheet P is fed from the main body housing 4 to the right side from the left side of the main body housing 4 and the upper housing 5. A paper discharge unit 6 is formed to be discharged toward the front.
[0011]
As shown in FIG. 2, the upper housing 5 includes an image reading unit 7 that reads and scans an image by exposing and scanning a document at an image reading position. The image reading unit 7 includes first and second traveling frames 12 and 13 in which an optical system including an exposure lamp 9 and mirrors 10 and 11 is mounted in a substantially rectangular scanner frame 8 (see FIG. 3). A lens 14 and a CCD line sensor 15 are provided. A rail member 16 is attached to the front and rear side plates 81 and 82 (see FIG. 3) of the scanner frame 8 by screws 17 (see FIG. 3), and the first and second traveling frames 12 and 13 are guided by the rail member 16. It is designed to travel back and forth. The first traveling frame 12 includes an exposure lamp 9 that irradiates light on the document, and a mirror 10 that reflects reflected light from the document to the second traveling frame 13. The second traveling frame 13 includes the first traveling frame 13. The mirror 11 reflects the reflected light from the traveling frame 12 toward the CCD line sensor 15.
[0012]
Then, the first and second traveling frames 12 and 13 are reciprocated in the left-right direction in FIG. 2 at a predetermined speed by a driving unit (not shown), and light is applied to the document placed on the contact glass 18 by the exposure lamp 9. , And the reflected light is guided to the CCD line sensor 15 via the lens 14 to read image information on the entire surface of the document.
[0013]
The main body housing 4 is disposed above the sheet feeding unit 19 disposed below, the first sheet conveying unit 20 disposed above the sheet feeding unit 19, and the first sheet conveying unit 20. An image forming unit 21, a fixing unit 22 disposed downstream of the image forming unit 21 in the paper transport direction, and a second paper transport unit for transporting the fixed paper and discharging it to the paper discharge unit 6 23 is stored.
[0014]
The paper feed unit 19 sends the paper P stacked on the paper feed cassettes 24 and 25 to the outlet side (left side in FIG. 1) of the paper feed cassettes 24 and 25 by the rotation operation of the paper feed rollers 26 and 27. The uppermost sheet P is fed to the sheet transport unit 20 one by one by separating with unillustrated separating claws provided at both upper ends in the width direction of the sheet feeding cassettes 24 and 25.
[0015]
The first paper transport unit 20 transports the paper fed from the paper feed unit 19 toward the image forming unit 21 by the transport roller pair 28, the registration roller pair 29, and the pre-transfer guide 30.
[0016]
The image forming unit 21 includes a photoconductive drum 31 rotatably supported on a photoconductive drum, and a charger 32 and a laser scanning unit (LSU) 33 around the photoconductive drum 31 along the rotation direction. The developing unit 34, the transfer unit 35, the cleaning unit 36, and the charge eliminating lamp 37 are provided to form a predetermined toner image on the photosensitive drum 31 by an electrophotographic process, and to transfer the toner image onto a sheet.
[0017]
The charger 32 charges the photosensitive drum 31 with a certain polarity (positive polarity in this embodiment).
[0018]
The laser scanning unit (LSU) 33 outputs a laser beam, which is intensified according to the image data of the document read by the image reading unit 7, from the laser emitter 38, and passes through the polygon mirror 39 and the reflecting mirror 40. The exposure region of the photosensitive drum 31 charged to positive polarity is irradiated. By this irradiated laser light, the surface potential of the photosensitive drum 31 is decreased according to the image, and an electrostatic latent image corresponding to the document image data is formed on the surface of the photosensitive drum 31. This light irradiation is repeatedly scanned in the width direction of the rotating photosensitive drum 31 to the exposure region between the charger 32 and the developing unit 34 by the rotation of the polygon mirror 39.
[0019]
The developing unit 34 attaches toner having the same polarity, that is, positively charged toner in the developing region to the portion of the electrostatic latent image on which the positive charge is reduced (the potential is reduced) on the photosensitive drum 31 by the laser beam. . As a result, the electrostatic latent image formed on the photosensitive drum 31 is developed with toner, and a toner image is formed on the surface of the photosensitive drum 31 as a visible image.
[0020]
The transfer unit 35 performs negative corona discharge from the back surface of the sheet by the transfer roller 41 disposed in a non-contact state in the transfer region of the photoconductive drum 31, and toner formed on the photoconductive drum 31. An image is electrostatically transferred onto a sheet.
[0021]
The cleaning unit 36 urges the tip of a cleaning blade (not shown) to the surface of the photosensitive drum 31 by the urging force of the urging means (not shown), and remains on the surface of the photosensitive drum 31 after transfer. The toner is scraped off.
[0022]
Although not shown in detail, the static elimination lamp 37 is configured in an array form in which a plurality of LED lamps are arranged in one or a plurality of rows over the entire width direction of the photosensitive drum 31, and the LED lamp light is photosensitized. The surface of the photosensitive drum 31 is irradiated to remove residual charges on the photosensitive drum 31.
[0023]
The fixing unit 22 is arranged on the downstream side of the image forming unit 21 in the sheet conveying direction, and presses the sheet on which the toner image is transferred in the image forming unit 21 with a heating roller 42 having a heater therein and the heating roller 42. The pressure roller 43 is heated and pressed, and the toner image is fused and fixed on the paper.
[0024]
The second paper transport unit 23 discharges the paper P on which the image has been formed by the image forming unit 21 from the fixing unit 22 to the paper discharge unit 6 via the discharge roller pair 44.
[0025]
Next, the part which concerns on this invention is demonstrated.
[0026]
FIG. 3 is a perspective view showing an attachment state of the scanner frame 8 to a main body frame as a framework of the apparatus main body 2.
[0027]
As shown in FIG. 3, the scanner frame 8 is a rectangular member having an opening on the upper surface. As described above, the inner surfaces of the front and rear side plates 81 and 82 of the scanner frame 8 have a U-shaped cross section. A rail member 16 is attached.
[0028]
As shown in FIG. 4, among the three surfaces of the rail member 16, two parallel surfaces 16 a and 16 b are travel surfaces 16 a and 16 b that reciprocate the first and second travel frames 12 and 13. At the same time, the remaining surface 16c is a mounting surface 16c that is in close contact with the inner surfaces of the front and rear plates 81 and 82 of the scanner frame 8. The rail member 16 is screwed onto the front and rear plates 81 and 82 of the scanner frame 8 by the mounting surface 16c. 17 (see FIG. 3). The rail member 16 is not limited to a U-shaped cross section, and may be, for example, an L shape.
[0029]
Returning to FIG. 3, the main body frame 45 extends from the lower frame 46 that houses the paper feeding unit 19, the image forming unit 21, the left frame 47 that houses the second paper transport unit 23, and the lower frame 46. The right side frame 48 and the rear side frame (not shown in the figure), and a flange 49 (see FIG. 5) extending inwardly from the upper end of the right frame 48 are configured. The paper discharge unit 6 is formed by an upper surface 46a of the lower frame 46, a left frame 47, a right frame 48, and a rear frame surrounding the side.
[0030]
The scanner frame 8 is placed on the left frame 47 and the flange portion 49 of the main body frame 45, and is fixedly attached to the main body frame 45 by screws 50 at two locations on both the left and right sides. That is, on the left side, the bottom plate 85 of the scanner frame 8 is positioned on the left frame 47 of the main body frame 45 so that the left side plate 84 of the scanner frame 8 and the left side frame 47 of the main body frame 45 are arranged on substantially the same plane. Fastened to the top surface with screws 50.
[0031]
On the other hand, the right side is fastened as follows.
[0032]
In the present embodiment, in order to make it easier to take out the paper discharged to the paper discharge unit 6, a right side wall 4a is provided on the back side on the right side of the main body housing 4, as shown in FIG. Is formed with a space 4b for taking out the paper. From this relationship, as shown in FIG. 3, the right frame 48 is formed on the back side, and therefore, the portion 8 a on the right front side of the scanner frame 8 cannot be fastened to the main body frame 45. Therefore, the portion 8a on the right front side of the scanner frame 8 is more easily deformed in the direction of the arrow B than the other portions.
[0033]
Therefore, in the present embodiment, as shown in FIGS. 3 and 5, a screw hole 831 a extending downward from a proper position on the back side of the right side plate 83 of the scanner frame 8 substantially parallel to the right side frame 48 of the main body frame 45 is provided. Two mounting pieces 831 (corresponding to connecting portions) are formed in the front-rear direction, and correspondingly, screw holes 48a are also formed in the right frame 48 of the main body frame 45, and the screw holes 831a, 48a are laterally formed. The screw 50 is screwed to bring the mounting piece 831 into close contact with the right frame 48 of the main body frame 45, whereby the right plate 83 of the scanner frame 8 and the right frame 48 of the main body frame 45 are arranged on substantially the same plane. I try to conclude. The number of attachment pieces 831 is not limited to two.
[0034]
As described above, since the right side plate 83 of the scanner frame 8 is fixed to the right side frame 48 of the main body frame 45, lifting of the right side plate 83 when the load is applied from above the scanner frame 8 is suppressed. Since the right side plate 83 of the scanner frame 8 is supported by the right side frame 48 having a large rigidity in the vertical direction, the right side portion of the scanner frame 8 has a high rigidity in the vertical direction, and the torsional rigidity of the scanner frame 8 in the vertical direction is high. growing. Thereby, compared with the conventional fastening structure, the portion 8a on the right front side of the scanner frame 8 is less likely to sink in the direction of the arrow B, and deformation of the scanner frame 8 can be suppressed.
[0035]
In the first embodiment, the attachment piece 831 is integrally formed from a proper position of the right side plate 83 of the scanner frame 8 and fastened to the main body frame 45. However, such an attachment piece 831 is not formed. As a second embodiment, as shown in FIG. 6, the right plate 83 of the scanner frame 8 and the right frame 48 of the main body frame 45 may be indirectly fastened via a predetermined fastening member 51. Good.
[0036]
That is, a screw hole 83a is formed at an appropriate position on the right side plate 83 of the scanner frame 8, and a screw hole 48a is also formed on the right side frame 48 of the main body frame 45, and has a screw hole 51a, 51b on the upper and lower sides. The fastening member 51 is brought into close contact with the right plate 83 and the right frame 48 by screwing the screws 50 and 50 'into the screw holes 51a, 83a and 51b, 48a from the side, and is arranged on substantially the same plane. Even if the right side plate 83 of 8 and the right side frame 48 of the main body frame 45 are fastened, the same operation as in the first embodiment can be obtained.
[0037]
In the first and second embodiments, screws are used to fasten the attachment pieces 831 and the fastening members 51. However, the present invention is not limited to this. For example, an adhesive or the like may be used.
[0038]
In the first embodiment, the present invention is applied to a scanner frame fastening structure provided in a copying machine. However, the present invention is not limited to this, and a scanner frame fastening structure provided in an image reading apparatus such as a facsimile apparatus or a scanner apparatus. Can be applied.
[0039]
【The invention's effect】
According to the present invention, a fastening structure for fastening a substantially rectangular scanner frame to the main body frame above a paper discharge space formed by surrounding a side other than the front side where a paper take-out space is formed. A connecting portion parallel to the side plate of the other frame to be fastened to one side plate of the left and right side plates of the scanner frame or one side plate of the left and right side plates of the main body frame disposed on substantially the same plane Since the scanner frame and the main body frame are fastened by attaching the connecting portion in close contact with the side plate of the other frame, the side plate of the scanner frame has a large rigidity in the vertical direction. Fastening between the side plate of the scanner frame and the side plate of the main body frame adjacent to a part of this side plate, which is supported by the side plate of the main body frame In minute, compared to the conventional fastening structure, to suppress sinking due to the load from the upper lifting and portions other than the adjacent portions of the adjacent portion.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external configuration of a copying machine.
FIG. 2 is a schematic diagram showing a schematic configuration of a copying machine.
FIG. 3 is a perspective view showing an attachment state of the scanner frame to the main body frame.
FIG. 4 is an explanatory diagram of a mounting state of a rail member.
FIG. 5 is a cross-sectional view of a fastening structure according to the present invention.
FIG. 6 is a cross-sectional view of another embodiment of a fastening structure according to the present invention.
FIG. 7 is an explanatory diagram of a conventional technique.
FIG. 8 is an explanatory diagram of a conventional technique.
FIG. 9 is an explanatory diagram of problems in the prior art.
[Explanation of symbols]
4 Main body housing 4a Right side wall 4b Paper take-out space 8 Scanner frame 8a Right front portion 83 Right side plate 831 Mounting piece 45 Main body frame 48 Right frame 49 Hook 51 Fastening member

Claims (1)

A fastening structure for fastening a substantially rectangular scanner frame to the main body frame above a paper discharge space formed by surrounding a side other than the near side where a paper take-out space is formed ,
One of the left and right side plates of the scanner frame or the one of the left and right side plates of the main body frame, which are arranged on substantially the same plane, is integrated with a connecting portion parallel to the side plate of the other frame to be fastened. A scanner frame fastening structure characterized in that the scanner frame and the main body frame are fastened by extending and connecting the connecting portion in close contact with the side plate of the other frame .

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