JPH1124183A - Original pressing cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately read an original by an original read part by constituting an original pressing cover of a platen cover freely opened/closed, a sheet member coming in contact with the back surface of the original and an elastic member pressing the sheet member to the back surface of the original at many points. SOLUTION: This original pressing cover C is attached to the original read part A through the supporting point P3 of an opening/closing mechanism E and is constituted of the platen cover 51, the sheet member 54 and a soft sponge member 52 being the elastic member. The cover 51 is attached to the mechanism E and the member 54 comes in contact with the back surface of the original D. The member 52 intervenes between the cover 51 and the member 54. The lower surface of the member 52 has many recesses 53b and many protrusions 53a, and the top of the protrusions 53a is stuck and attached to the back surface of the member 54. In such a case, each protrusions 53a is deformed to absorb warpage and obtains uniform pressing force with the member 52 as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an apparatus having a stationary original reading section on which a stationary original is placed, such as a copier or an image recording apparatus having both a facsimile function and a copying function. And a document pressing cover for pressing a document placed on a document from above.

[0002]

2. Description of the Related Art Conventionally, a document pressing cover for pressing a document placed on a stationary document reading surface of a document reading section from above,
It is composed of a resin platen cover rotatably supported by the document reading unit and a sheet member that comes into contact with the document. In general, a sponge member for pressing the sheet member against the back of the document is provided between the platen cover and the sheet member. The sponge member was a plate-like member having a predetermined thickness, and was attached such that the entire upper surface was attached to the platen cover, and the entire lower surface was attached to the entire back surface of the sheet member.

[0003]

However, in the conventional document holding cover described above, if the platen cover is warped, the sponge member also warps due to the warpage.
Strain occurs in the sponge member. Due to that distortion,
There has been a problem that a uniform pressing force cannot be obtained by the sponge member 54. Further, depending on the amount of distortion, the flatness of the original pressing surface of the sheet member is lost and the sheet member becomes curved. As a result, the original on the stationary original reading surface of the original reading unit cannot be reliably pressed, and the original partially rises from the still original reading surface due to the distortion of the original, and the read image is distorted or a part that cannot be read occurs. Was causing problems. Further, if the document pressing cover does not sufficiently hold down the document, there is a problem that light enters from outside and the read image quality deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional drawback, and even if the platen cover is warped, the original can be reliably pressed onto the stationary original reading surface of the original reading section. An object of the present invention is to provide a document holding cover that allows a user to read a document accurately.

[0005]

In order to achieve the above object, a document holding cover according to the present invention comprises a platen cover provided on a flat stationary document reading section so as to be openable and closable, and a stationary document reading surface of the document reading section. And a resilient member interposed between the platen cover and the sheet member and pressing the sheet member against the back of the document at multiple points. Further, the elastic member is a sponge member having a large number of irregularities. Further, a number of irregularities of the sponge member are present on the surface facing the sheet member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a document pressing cover according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view showing a closed state of a document pressing cover according to an embodiment of the present invention. FIG. 2 is a perspective view of an image recording apparatus to which the document pressing cover of the present invention is applied. FIG. 3 shows FIG.
3 is a cross-sectional view of the image reading unit.

First, as an application example of the document pressing cover of the present invention, an image recording apparatus having an image reading section for a static document provided on an upper portion will be described with reference to FIGS. As a housing structure of the entire apparatus, a document reading unit A and a recording unit 10 are provided vertically. The image reading unit is provided on the upper part of the image recording apparatus, and has a transparent stationary document reading surface B on which books and the like are placed is provided on the upper surface. On the side of the stationary document reading surface B, a document holding cover C is attached to the document reading section A via an opening / closing mechanism E so as to be openable and closable. Is pressed down from above. The details of the document holding cover C will be described later.

In the document reading section A, as shown in FIG.
A photoelectric conversion unit 13 including a lens 13a and a photoelectric converter 13b is provided on the bottom surface. Then, the first scanning body 11 including the light source 11a and the first reflecting mirror 11b
And the second scanning body 12 having the second reflecting mirror 12a and the third reflecting mirror 12b are transported below the stationary original reading surface B, and the light source 11a irradiates the stationary original reading surface B. The image of the document D placed thereon is reflected via the first reflecting mirror 11b, the second reflecting mirror 12a, and the third reflecting mirror 12b,
The image is formed by the lens 13a of the photoelectric conversion unit 13 and converted into an electric signal by the photoelectric converter 13b.

A stationary original reading surface B is provided above the original reading section A.
Is provided adjacent thereto, and a continuous document supply unit 15 is provided above the moving document reading unit 14, so that the document can be continuously supplied and read one by one. I have. In this case, the first scanning body 11 and the second scanning body 12 are kept below the moving document reading unit 14.

On the basis of the image information read by such an image reading unit or the received facsimile information, a recording unit formed in the recording unit 10 records on a recording sheet. .

Next, the details of the document pressing cover C of the present invention will be described with reference to FIG. First, the configuration of the document pressing cover C will be described. As described above, the document pressing cover C is attached to the document reading unit A via the fulcrum P3 of the opening / closing mechanism E described later. More specifically, the document holding cover C is composed of the platen cover 51 and the sheet member 5.
4 and a flexible sponge member 52 which is an elastic member. The platen cover 51 is attached to the opening / closing mechanism E. The sheet member 54 is a member that contacts the back surface of the document D.

A sponge member 52 is interposed between the platen cover 51 and the sheet member 54. The upper surface of the sponge member 52 is flat, and the entire upper surface portion thereof is attached to the lower surface of the platen cover 51.
The lower surface of the sponge member 52 has a large number of concave portions 53b and a large number of convex portions 53a. When the document holding cover C is in the closed state, the sheet member 5
4 are independently pressed by the respective projections 53a of the sponge member 52. Further, since the sponge member 52 is used as the elastic member, the weight of the document pressing cover C can be reduced, and the opening and closing operation of the document pressing cover C can be easily performed.

Next, the operation of the document pressing cover C will be described. The platen cover 51 is made of, for example, a resin to reduce the weight and improve the operability of opening and closing. However, a warp as shown in FIG. 1 is generated thereby, and the continuous document supply unit 15 is omitted. Is shown). The platen cover 51 in the closed state shown in FIG. 1 has an uneven warp shape with respect to the stationary document reading surface B. Sponge member 52
However, if the platen member or the like is used, the sponge member 52 is distorted due to the above-described warpage of the platen cover 51. But,
Due to the concave portion 53b provided on the lower surface of the sponge member 52, the distortion of the sponge member 52 is released,
In particular, the projection 53a hardly causes distortion. Therefore, even if the platen cover 51 is warped, the elastic force of the sponge member 52 is not affected. Each of the projections 53a is deformed so as to absorb the warp, and a uniform pressing force is obtained with the sponge member 52 as a whole.

Further, the flatness of the original pressing surface of the sheet member 54 can be maintained. As a result, the original D on the stationary original reading surface B of the original reading unit A can be reliably pressed, and even if the original D is distorted, the read image may be distorted or a part that cannot be read may occur. Absent. That is,
The original D on the stationary original reading surface B can be accurately read by the original reading unit.

In the above embodiment, the case where the concave portion and the convex portion of the elastic member are the lower surface has been described. However, the present invention can be applied to the case where the concave portion and the convex portion of the elastic member are the upper surface. is there.

In the above embodiment, the case where the elastic member is a sponge member having a concave portion and a convex portion has been described.
For example, the present invention can be similarly applied even when a large number of compression springs are substituted.

[0017]

According to the first aspect of the present invention, even if the platen cover is warped, the elastic member is not distorted, and multiple points are independently pressed by the elastic member, thereby affecting the elastic force. Is prevented. Then, the flatness of the original pressing surface of the sheet member can be maintained without affecting the sheet member, and the original on the stationary original reading surface of the original reading section can be surely pressed. The document will rise, the scanned image will be distorted,
There is no problem that a part that cannot be read occurs. The original on the stationary original reading surface can be accurately read by the original reading unit.

According to the second aspect of the present invention, since the elastic member is a sponge, the weight of the document pressing cover can be reduced, and the opening / closing operation can be easily performed.

According to the third aspect of the present invention, the elastic member is less affected by the warpage of the platen cover.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a closed state of a document pressing cover according to an embodiment of the present invention.

FIG. 2 is a perspective view of an image recording apparatus to which the original document pressing cover of the present invention is applied.

FIG. 3 is a cross-sectional view of the image reading unit of FIG.

[Explanation of symbols]

 51 platen cover 52 sponge member 53a convex portion 53b concave portion 54 sheet member A original reading section B stationary original reading surface C original pressing cover D original E opening and closing mechanism P3 fulcrum

Claims (3)

[Claims] A platen cover provided on a flat stationary document reading section so as to be openable and closable, a sheet member in contact with the back of a document placed on a stationary document reading surface of the document reading section, a platen cover and a sheet member. And an elastic member interposed between the elastic members and pressing the sheet member against the back of the original at multiple points. 2. The document holding cover according to claim 1, wherein the elastic member is a sponge member having a large number of irregularities. 3. The document pressing cover according to claim 2, wherein a number of irregularities of the sponge member are provided on a surface facing the sheet member.