JP2602547B2 - Image reading device - Google Patents

Description

The present invention relates to an image reading apparatus such as a copying apparatus for copying image information obtained by reading an image of a document or a recording apparatus for recording image information. More specifically, the present invention relates to an exterior cover applied to a document table of an image reading apparatus.

(B) Conventional technology Conventionally, when reading a document image in a copying apparatus or the like, an original is placed at a predetermined position on a document placing table made of transparent glass or the like, and the image is read by an optical system while being pressed by a cover. Is being read. FIG. 10 shows an example of this type of conventional image reading apparatus.

In FIG. 10, the main body frame 3 of the image reading device 1 is shown.
Is composed of front, rear, left and right side plates 3a, and an opening 3c is formed in an upper plate 3b continuously and integrally provided above the side plates 3a. Original mounting table 5 made of transparent glass, etc.
Is placed on the opening 3c in a state where the opening 3c is closed, and four side edges 5a thereof are pressed by the pressing pieces 6a of the pressing member 6, so that the original mounting table 5 Aperture
Fixed to 3c. The holding member 6 has a crank-shaped cross section, and its base is fixed to the side plate 3a by a screw 7.

An outer cover 9 is attached to the outside of the main body frame 3. An upper plate 9 a integrally provided on the upper part of the outer cover 9 has an opening slightly smaller than the opening 3 c of the main body frame 3. 9b is formed. This exterior cover 9
Is attached to the main body frame 3 so that the contact surface 9c near the opening 9b of the upper plate 9a is in close contact with the upper surface 5b of the document table 5.

(C) Problems to be Solved by the Invention However, when the holding member 6 shown in FIG. 10 is made of a plywood such as a bond steel plate, the holding member 6 completely covers the document table 5 due to the tolerance of each component. Sometimes it can't be held down.

When the exterior cover 9 is mounted on the main body frame 3, a gap C as shown in FIG. 11 is generated between the exterior cover 9 and the document table 5 due to the dimensional tolerance of each component. The thickness of the paper of a normal document is about 0.1 mm, and considering the accumulated component tolerance, a gap of 0.1 mm or more, that is, a gap such that the document 10 enters the gap C as shown in FIG. C may occur. When the document 10 enters the gap C, there is a problem that the important document 10 is damaged or damaged.

In view of this, the present invention is configured such that the document placing table 5 can be pressed by the periphery of the opening of the exterior cover, so that the conventional pressing member that fixes the document placing table 5 is omitted, and the outer cover 9 is brought into contact with the document. It is an object of the present invention to provide an outer cover of an image reading apparatus that prevents the original 10 from entering between the surface 9c and the upper surface of the original placing table 5.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances, and has been described in view of the above circumstances, and has an original placing table disposed on an upper portion of a main body frame and a size of an area for placing an original on the original placing table. An outer cover having an opening at an upper portion thereof and attached to the main body frame from above, wherein the outer cover has elasticity integrally formed on four sides of the opening. A pressing portion, wherein the pressing portion overlaps the document mounting table in a vertical direction in a state where the exterior cover is mounted on the main body frame, and presses and fixes the document mounting table to the main body frame. It is characterized by.

(E) Operation Based on the above configuration, the document placing table is positioned and arranged on the main body frame, and when the exterior cover is attached to the main body frame in this state, it is integrally formed on each of the four sides of the opening of the exterior cover. The original placing table is pressed and fixed to the main body frame by the pushed pressing portion. Since the pressing portions are formed from elastic members vertically overlapping the document table in the state where the outer cover is attached, the upper surface of each of the four sides of the document table and each pressing portion are formed. This prevents the occurrence of a gap in the contact portion with the sheet, thereby preventing the sheet from slipping into the gap or being broken.

In addition, since the pressing portion is formed integrally with the main body frame, pressing and fixing of the document placing table to the main body frame can be easily performed only by attaching the outer cover to the main body frame.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of an image reading apparatus showing a first embodiment of the present invention, and FIG. 2 is a perspective view of the same. The exterior cover 11 of the image reading apparatus is formed integrally, and an opening B is formed in the upper plate 11a. Each of the four sides forming the opening 12 is inclined in a direction in which the edge is lowered to form a pressing portion 11b described later. The pressing portion 11b
Is formed in a tapered thin shape as shown in FIG. 3 and has appropriate elasticity. As shown in FIG. 5, the pressing portion 11b has a notch 13 at the intersection of two adjacent sides.

An original mounting table 5 is mounted on the opening 3c of the main body frame 3 of the image reading apparatus. One side of the original mounting table 5 is formed integrally with the upper plate 3b as shown in FIG. It is locked by the locking piece 3d. Further, the side surface of the document table 5 opposite to the locking piece 3d is locked by a locking member 15 which advances and retreats with respect to the document table 5 and whose fixed position is adjustable. Stop member 15 is screwed to upper plate 3b by screw 16.
It is fixed to. The other two sides of the document table 5 are similarly locked. Note that the first surface of the document table 5
As shown in the figure, a document index 17 for positioning the document 10 is provided.

The exterior cover 11 is incorporated into the main body frame 3 from the direction of arrow 19 shown in FIG. It is mounted in the state shown in FIG. Here, the pressing portion 11b of the outer cover 11 is configured to overlap the upper surface 5b of the document table 5 by a dimension A as shown in FIG. Further, since the pressing portion 11b has a thin shape and elasticity as described above, the outer cover 11 is
At the time of actual mounting, each pressing portion 11b is pushed by the document table 5 as shown in FIG. 4 and bends in the direction of the arrow 20, and the document table 5 is pressed against the opening 3c of the body frame 3 by its elasticity. State.

When the pressing portion 11b bends in the direction of the arrow 20, the corner at the free end moves in the approaching direction, but by forming the width of the notch 13 to a predetermined size, the adjacent pressing portion 11b
Do not interfere with each other. Further, the overlap dimension A of the pressing portion 11b with respect to the upper surface 5b of the document placing table 5 is set to the amount of overlap that can reliably press the document placing table 5 against the main body frame 3 even if each component has an accuracy within tolerance. Has become.

As described above, by forming the outer cover 11, the leading edge of the pressing portion 11b always comes into close contact with the upper surface 5b of the document table 5 as shown in FIG. 5 is placed on the pressing portion 11
In addition to reliably contacting the leading edge of the document b, it is possible to prevent the document 10 from intruding into the gap and damage to the document 10 due to this, which occur in the conventional apparatus.

FIG. 8 shows an outer cover of an image reading apparatus according to a second embodiment of the present invention. The exterior cover 21 has a plurality of pressing portions 21b having elasticity by providing notches 22 at right angles to each side of the opening 21c, and the exterior cover 21 having such a pressing portion 21b may also be used. In the same manner as in the first embodiment, an effect that the original 10 can be stably mounted on the original mounting table 5 can be obtained.

Further, since the leading end of the pressing portion 11b is in close contact with the document table 5, it is possible to align the document edge with the leading end of the pressing portion 11b. It is shown in FIG. In the drawing, among the pressing portions 11b, indices 23, 25 and the like are displayed at a position corresponding to the document 10 placed on the document placing table 5 in a pair of adjacent pressing portions 11b. By providing the indices 23 and 25 on the pressing portion 11b, the pressing portion 11b also has the function of the document index 17 in FIG. 1 in addition to the pressing action of the document table 5 as described above. Thus, the document index 17 can be omitted.

(G) Effects of the Invention As described above, according to the present invention, the four sides of the opening formed in the upper part of the outer cover overlap the original placing table provided on the main body frame when the outer cover is attached. Since the pressing portion is formed integrally with the outer cover, the original mounting table can be pressed by the pressing portion and fixed to the original mounting table by attaching the outer cover to the main body frame. A gap is prevented from being generated in a contact portion between the document and the upper surface of the document table, and damage to the document due to the gap can be prevented.

Also, since a plurality of pressing portions for pressing and fixing the document table are formed integrally with the outer cover, a dedicated pressing member for pressing and fixing the document table to the main body frame,
In addition, it is possible to omit the work of attaching the same, and it is possible to reduce the cost of the device and improve the workability of the assembly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an image reading apparatus to which the first embodiment of the present invention is applied, FIG. 2 is a perspective view of the same, FIG. 3 and FIG. 5 and 6 are perspective views of the same, FIG. 7 is a vertical sectional side view showing a state of placing a document, FIG. 8 is a perspective view of an outer cover showing a second embodiment of the present invention, and FIG. FIG. 10 is a perspective view of an exterior cover showing a third embodiment of the present invention, and FIGS. 10 and 11 are longitudinal sectional side views respectively showing main parts of a conventional exterior cover. 3 ... body frame, 5 ... original mounting table, 11 ... exterior cover, B ... opening, 11b ... pressing part, 13,22 ... notch, 17 ... original index, 23, 25 ... index.

Claims (2)

(57) [Claims] An external cover mounted on the main body frame from above with an original mounting table disposed at an upper portion of the main body frame and an opening having a size large enough to mount an original on the original table; Wherein the exterior cover includes an elastic pressing portion integrally formed on four sides of an opening thereof, and the pressing portion mounts the external cover on the main body frame. An image reading apparatus, wherein the original mounting table is vertically overlapped with the original mounting table in a state, and the original mounting table is pressed and fixed to the main body frame. 2. The image reading apparatus according to claim 1, wherein at least one side of the pressing portion has an index indicating a document placement position.