JP3581567B2 - Image reading apparatus and image forming apparatus provided with the image reading apparatus - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading apparatus that reads an image on a document, and an image forming apparatus that includes the image reading apparatus and forms an image read by the image reading apparatus.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine, a facsimile, and a scanner reads an original with an image reading device.
[0003]
For example, as shown in FIG. 8, the image reading apparatus includes a document conveying / discharging unit A that conveys and discharges a sheet-shaped document “hereinafter, simply referred to as a“ document ””, and a document reading unit B that reads the document. I have.
[0004]
The document transport / ejecting unit A first sends out the document D loaded on the document placing table 1 from the document placing table 1 by the preliminary transporting roller 2 and the preliminary pressing plate 3, and the separation roller 5 in contact with the separating piece 4. The originals are separated one by one, and are further conveyed to the original reading section B by the original feeding roller 6 and the original feeding roller 8 pressed by the pressing spring 7.
[0005]
The document reading unit B includes a document table glass 9 and a white pressure plate 10 that faces the document table glass 9 with a small gap. The original D conveyed from the original conveyance / ejection unit A is discharged by an original discharge roller 11 and an original discharge roller 12 which change the conveyance direction at the location of the white pressure plate 10 and discharge the read original D. It is discharged onto the tray 13. In this case, as shown in FIG. 8, the conveyance path of the document D is bent at the location of the white pressure plate 10, and the document D is bent and conveyed in a J-shape.
[0006]
As described above, the case where the originals D are automatically and continuously read has been described. However, when reading the originals one by one, the originals D must be set on the original platen glass 9 one by one.
[0007]
In this case, as shown in FIG. 9, the document D is surrounded by a size index vertical scale 9 a and a size index horizontal scale 9 b attached to the document table glass 9 at right angles to each other, as indicated by reference numeral 9 c. It is set with reference to the scales of both scales 9a and 9b. The platen glass 9 is surrounded by a frame 105 shown in FIG.
[0008]
As shown in FIGS. 10 and 11, the original D is placed on the original platen glass 9 by a white pressure contact sheet 101 provided on the lower surface of a lid 104 provided on the image forming apparatus main body so as to be opened and closed by hinges 102 and 103. Is pressed against.
[0009]
If the document D is not in close contact with the platen glass 9, a gap is formed between the document D and the platen glass 9, and the document reading unit B cannot read the document D reliably. For this reason, the white pressure contact sheet 101 has a flexibility enough to bring the document D into close contact with the platen glass 9 and has a flat surface.
[0010]
[Problems to be solved by the invention]
However, since the white pressing sheet 101 has a flat surface, when the document D is not set on the platen glass 9, the white pressure-contact sheet 101 is in close contact with the platen glass 9 and is difficult to separate from the platen glass 9. There is.
[0011]
Therefore, when the cover 104 is opened, the document reading apparatus has the same effect as when the cover 104 is heavier, and there is a problem that the cover 10 must be lifted with a larger force than usual.
[0012]
(Purpose)
An object of the present invention is to provide an image reading apparatus that can easily open a cover even when a press-contact sheet comes into close contact with a platen glass, and an image forming apparatus including the apparatus. And
[0013]
[Means for Solving the Problems]
The above problem is solved by the following image reading device.
[0014]
A document table glass whose periphery is surrounded by a frame, a reading unit that reads a document placed on the document table glass, a lid provided on the frame by a hinge to open and close the document table glass, and the lid A press-contact sheet provided at a portion of the body facing the platen glass and pressing the document against the platen glass when the lid is closed, an opening and closing end of the press-contact sheet. A gap that communicates to the outside between the edge of the document table glass and the edge of the frame body, the projection including a protruding portion that protrudes outward from the edge of the platen glass. It is characterized by having.
[0018]
The opening and closing end is an end opposite to the hinge.
[0019]
The protrusion is formed at a part of an open / close end of the press-contact sheet.
[0022]
The above problem is further solved by the following image forming apparatus.
[0023]
An image reading device according to any one of the above, and an image forming unit that forms an image read by the image reading device on a sheet.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
First, an image forming apparatus 30 provided with the image reading apparatus 200 of the present invention will be schematically described with reference to FIG.
[0026]
The image forming apparatus 30 converts image information obtained by the main and sub scanning of the original D set on the original platen glass 9 of the original reading section B by the CCD sensor 31 as a line sensor and the mirror base 32 into the laser scanner 33 Thus, a latent image is formed on the photosensitive drum 34, and a toner image is formed by attaching toner. The toner image is transferred to the recording sheet sent from the cassette 35 by the transfer roller 36, and is permanently fixed by the heat and pressure of the fixing device 37. As a result, the image of the document is copied on the recording sheet.
[0027]
Next, in the image reading apparatus 200, only the parts different from the conventional example will be described. The same parts as those in the conventional example are denoted by the same reference numerals, and description of the parts will be omitted.
[0028]
FIG. 1 is a plan view of the image reading apparatus 200 in which the lid 104 is omitted, and is a schematic view showing an arrangement relationship between the original platen glass 9 and the white pressure contact sheet 201. FIG. 2 is a schematic sectional view taken along line 2-2 in FIG.
[0029]
The surface of the frame 105 and the surface of the platen glass 9 are aligned at the same height. In other words, they are flush. The frame 105 may be divided depending on the size, but in FIG. 1, the frame 105 is an integral body formed by cutting out the center and forming a square shape in plan view.
[0030]
The front end 201a of the press contact sheet 201 opposite to the hinges 102 and 103 is entirely protruded outward beyond the edge 9d of the document table glass 9. The front end portion 101a of the conventional pressure contact sheet 101 (see FIG. 11) is located inside the edge 9d of the document table glass 9.
[0031]
A gap S is formed between the edge 9d of the document table glass 9 facing the front end 201a of the pressure contact sheet 201 and the edge 105a of the frame 105. In FIG. 1, the gap S extends leftward from the left side end 201b of the press contact sheet 201.
[0032]
With such a configuration, outside air always enters the gap S, and the adhesion of the front end portion 101a of the press-contact sheet 101 to the platen glass 9 is weaker than other portions. .
[0033]
Therefore, when the cover 104 is opened in the direction of the arrow in FIG. 2 from the state where the cover 104 is closed, the press-contact sheet 101 is easily peeled off the edge 9 d of the platen glass 9 and the cover 104 is opened. There is no time load. Therefore, the lid 104 can be opened lightly with a smaller force than before.
[0034]
Instead of providing the gap S, the edge 9a of the platen glass 9 and the edge 105a of the frame 105 have a height difference, and the front end portion 101a of the press-contact sheet 101 and the platen glass 9 Alternatively, a similar effect can be obtained even if a gap is formed between the frame 105 and the frame 105 so that outside air can enter the gap.
[0035]
In FIG. 2, the press contact sheet 101 is separated from the platen glass 9, but is separated for easy understanding of the drawing, and is actually in close contact with the platen glass 9. .
[0036]
The front end of the press-contact sheet may be partially protruded like the front end 301a of the press-contact sheet 301 shown in FIG. In this case, the press-contact sheet 301 is peeled off from the platen glass 9 from the front end portion 301a that partially protrudes.
[0037]
Further, the front end of the press-contact sheet may be bent to the opposite side of the original table glass 9 as in the front end 401a of the press-contact sheet 401 shown in FIG. In this case, a gap S4 is generated between the front end 401a of the press-contact sheet 401 and the document table glass 9 or the frame 105, and external air enters the gap S4 from both left and right ends of the front end 401a. The same operation and effect as those of the press contact sheet 201 of FIG. Note that the gap S between the edge 9d of the platen glass 9 and the edge 105a of the frame 105 is not necessarily required. Further, the front end 401a may be bent by protruding only a part thereof, similarly to the front end 301a shown in FIG. In this case, the gap S is required.
[0038]
The front end of the press-contact sheet is formed in a stepped shape by bending the entire front end 501a to the opposite side to the original table glass 9 like the front end 501a of the press-contact sheet 501 shown in FIG. A sheet 106 may be provided on the platen glass 9 side. In this case, a gap S5 is formed between the stepped portion and the platen glass 9, and external air enters the gap S5 from both left and right ends of the front end 501, and the press-contact sheet of FIG. The same operation and effect as those of 201 are produced. Note that the gap S between the edge 9d of the platen glass 9 and the edge 105a of the frame 105 is not necessarily required. Further, the front end 501a may be bent by protruding only a part thereof, similarly to the front end 301a shown in FIG. In this case, the gap S is required.
[0039]
Further, as in a press-contact sheet 601 shown in FIG. 6, the side end portion 601c may be protruded to the side, bent, or bent stepwise, and the sheet 107 may be attached. Also in this case, it is necessary to form a gap S6 between the side edge 9e of the platen glass 9 and the edge 105b of the frame 105. Further, the front end 601a may be partially protruded similarly to the front end 301a shown in FIG.
[0040]
In the claims, the “opening / closing end” refers to the remaining end other than the end facing the hinges 102 and 103. For example, in FIG. 1, it means the front end 201a and the side ends 201b and 201c.
[0041]
【The invention's effect】
In the image forming apparatus of the present invention, the open / close end of the press-contact sheet is projected outward from the edge of the glass, bent, a sheet is provided at the open / close end of the press-contact sheet, or between the glass and the frame. A gap is formed to make it easier for outside air to enter the periphery of the press-contact sheet.Therefore, even if the press-contact sheet is in close contact with the platen glass, the press-contact sheet can be removed from the platen glass. It can be easily peeled off, and the lid can be easily opened and closed with a smaller force than before.
[0042]
Further, since the press-contact sheet can be easily peeled off, the adhesion of the press-contact sheet to the platen glass can be improved, and the document can be securely brought into close contact with the platen glass, thereby improving the image reading accuracy.
[0043]
Further, since the image forming apparatus includes an image reading device capable of securely bringing the original into close contact with the platen glass, a high-quality image can be formed.
[Brief description of the drawings]
FIG. 1 is a plan view of an image reading apparatus according to an embodiment of the present invention, from which a cover is omitted.
FIG. 2 is a schematic sectional view taken along line 2-2 in FIG.
FIG. 3 is a plan view of a press contact sheet according to another embodiment.
FIG. 4 is a cross-sectional view of a press-contact sheet according to another embodiment, corresponding to FIG.
FIG. 5 is a cross-sectional view of a press-contact sheet according to another embodiment, corresponding to FIG.
FIG. 6 is a plan view of a press contact sheet according to another embodiment.
FIG. 7 is a front sectional view of an image forming apparatus including the image reading device according to the embodiment of the present invention.
FIG. 8 is a front sectional view of a conventional image reading apparatus.
FIG. 9 is a perspective view of a platen glass.
FIG. 10 is an external view of a conventional image reading apparatus with a lid opened.
FIG. 11 is a plan view of a conventional pressure contact sheet.
[Explanation of symbols]
D Documents S, S4, S5 Gap A Conveyance / ejection unit B Document reading unit (reading unit)
9 Original platen glass 9a Size index vertical scale 9b Size index horizontal scale 9c Area 9d Edge 9e Side edge 30 Image forming device 34 Photosensitive drum (image forming unit)
36 Transfer roller (image forming unit)
201, 301, 401, 501, 601 White pressure contact sheets 201a, 301a, 401a, 501a Front ends (open ends, protrusions) of pressure contact sheets
102 Hinge 103 Hinge 104 Lid 105 of image reading device Frame 105a Frame edge 105b Frame edge 106 Sheet (thin sheet)
107 sheets (flakes)
200 Image reading device 201b, 201c, 601c Side end (open end) of pressure contact sheet

Claims (4)

A platen glass whose periphery is surrounded by a frame,
A reading unit that reads a document placed on the platen glass;
A lid provided on the frame by a hinge to open and close the platen glass,
A press-contact sheet that is provided at a portion of the lid facing the platen glass and closes the lid to the platen glass when the lid is closed;
In the image reading device provided with
At the open / close end of the press-contact sheet, a protrusion is provided that protrudes outward from the edge of the platen glass, and between the edge of the platen glass and the edge of the frame facing the protrusion. An image reading device comprising a gap portion communicating with the outside. The image reading apparatus according to claim 1 , wherein the opening and closing end is an end opposite to the hinge. The projecting portion is an image reading apparatus according to claim 1 or 2, characterized in that it is formed on a portion of the opening and closing end of the pressure sheet. An image reading device according to any one of claims 1 to 3 ,
An image forming unit that forms an image read by the image reading device on a sheet,
An image forming apparatus comprising:

Images