JPH02287530A - Image reader - Google Patents

Abstract

PURPOSE:To prevent an original from damaging by integrating a pressing part overlapped on an original placing plate provided on a main body frame with a cover when the cover is mounted on the four sides of an opening formed on the top of the exterior cover. CONSTITUTION:The pressing parts 11b of the exterior cover 11 are constituted so that they are overlapped by a dimension A with respect to the top surface 5b of the original placing plate 5. When the pressing parts 11b are bent in the direction of an arrow 20 so that the angle parts of their free edges approach to each other, notching width is set at a prescribed size and the pressing parts 11b don't interfere with each other. Besides, the overlapping quantity A of the pressing parts 11b with respect to the top surface 5b is set at overlapping quantity necessary for pressing the original placing plate 5 on the main body frame 3. By adhering the cover 11 to the placing plate 5, the edge part of the original is precisely made to abut on the leading edges of the pressing parts 11b and the infiltration of the original into spaces, original damaging, etc., are prevented.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to an image reading device such as a copying device that copies image information obtained by reading an image of a document, or a recording device that records image information. In particular, the present invention relates to an exterior cover applied to a document mounting table of an image reading device.

(■) Conventional technology Conventionally, in order to read a document image in a copying machine, etc., the document is placed on a predetermined position on a document table made of transparent glass, etc., and while the document is held down by a cover, an optical system scans the document image. is being read. An example of a conventional image reading device of this type is shown in FIG. 1O.

In FIG. 10, the main body frame 3 of the image reading device 1
It is made up of front, rear, left and right side plates 3a, and an opening 3C is formed in an upper plate 3b which is continuously and integrally provided on the upper part of the side plates 3a. The document mounting table 5 made of transparent glass or the like closes the opening 3C.
The document mounting table 5 is fixed to the opening 3C of the main body frame 3 by pressing the four side edges 5a thereof with the pressing pieces 6a of the pressing member 6. The above pressing member 6
has a crank-shaped cross section, and its base is fixed to the side plate 3a with screws 7.

An exterior cover 9 is attached to the outside of the main body frame 3, and an upper plate 9a integrally provided on the upper part of the exterior cover 9 has an opening slightly smaller than the opening 3C of the main body frame 3. 9b is formed. By attaching this exterior cover 9 to the main body frame 3, the upper plate 9
The abutting surface 9C near the opening 9b of a is adapted to come into close contact with the upper surface 5b of the document mounting table 5.

(C) Problems to be Solved by the Invention However, when the holding member 6 shown in FIG. There may be times when you cannot hold it down.

Furthermore, when the exterior cover 9 is attached to 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 normal manuscript paper is approximately 0.1■,
Considering the accumulation of component tolerances, gaps of 0.1 mm or more,
That is, as shown in FIG. 11, there is a possibility that a gap C that is large enough to cause the document 10 to enter the gap C may occur. Manuscript 1
If 0 were to enter the gap C, there would be a problem that the important document 10 would be damaged or damaged.

Therefore, the present invention has a configuration in which the original platen 5 can be pressed by the area around the opening of the outer cover, thereby omitting the conventional presser member that fixed the original platen 5, and also allows the outer cover 9 to come into contact with the original platen 5. It is an object of the present invention to provide an exterior cover for an image reading device 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-mentioned circumstances. For example, when shown with reference to FIGS.
) The original placing table (5) arranged at the top and the original placing table (
5) has an opening (
B) on the top and is attached to the main body frame (3) from above. A pressing portion (llb) is integrally formed, and the pressing portion (llb) is connected to the exterior cover (11).
When attached to the main body frame (3), it overlaps the document mounting table (5) in the vertical direction, and due to the overlap, the pressing part (llb) pushes the document mounting table (5) onto the main body frame (3). It is characterized by being fixed by pressing.

(E) Function Based on the above configuration, the document mounting table (5) is mounted on the main body frame (
3) Positioned and arranged on the exterior cover (11)
When the is attached to the main body frame (3), the document mounting table (5)
) The pressing part (llb) of the exterior cover (11) against the top surface
), the document mounting table (5) is pressed and fixed to the main body frame (3).

Note that the numbers in parentheses are shown for reference to the drawings and do not limit the configuration of the present invention in any way.

(f) Example Embodiments of the present invention will be described below along with the drawings.

FIG. 1 is an exploded perspective view of an image reading device 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 device is integrally formed, and has an opening B formed in its top plate 11a. Each of the four sides forming the opening 12 is inclined in a downward direction at the edge to form a pressing portion 11b to be described later. As shown in FIG. 3, the pressing portion 11b is formed into a thin tapered shape and has appropriate elasticity. The above pressing part 11b
As shown in FIG. 5, notches 13 are formed at the intersections of two adjacent sides.

A document placing table 5 is placed on the opening 3C of the main body frame 3 of the image reading device, and one side of this document placing table 5 is integrally formed with the upper plate 3b as shown in FIG. It is locked by a locking piece 3d. In addition, the locking piece 3
A locking member 1 is provided on the side surface of the document placing table 5 located on the opposite side to the document placing table 5, and the locking member 1 can be freely adjusted to a fixed position by moving back and forth with respect to the document placing table 5.
5, and this locking member 15 is secured by a screw 16.
is fixed to the upper plate 3b. The other two sides of the document table 5 are also locked in the same manner. Note that, as shown in FIG. 1, a document index 17 for positioning the document 10 is provided on the upper surface of the document table 5. As shown in FIG.

The exterior cover 11 is assembled into the main body frame 3 from the direction of the arrow 19 shown in FIG. It is installed in the state shown in Figure 2. Here, the pressing portion 11b of the exterior cover 11 is
As shown in FIG. 3, it is configured to overlap the upper surface 5b of the original table 5 by a dimension A. In addition, since the pressing portions 11b have a thin wall shape and are elastic as described above, when actually attaching the exterior cover 11 to the main body frame 3, each pressing portion 11b
As shown in FIG. 4, the document holder 1b is pushed by the original table 5 and bent in the direction of the arrow 20, and its elasticity causes the document holder 5 to be pressed against the opening 3c of the main body frame 3.

When the pressing part 11b bends in the direction of the arrow 20, the corners of the free end move toward each other, but by forming the width of the notch 13 to a predetermined size, the adjacent pressing part 11b They are designed not to interfere with each other. In addition, the overlap dimension A of the pressing part 11b with respect to the upper surface 5b of the original platen 5 is such that even if each part has a precision within the tolerance, the amount of overlap is enough to reliably press the original platen 5 against the main body frame 3. There is.

As described above, by configuring the exterior cover 11, the leading edge of the pressing portion 11b is always in close contact with the upper surface 5b of the document mounting table 5, as shown in FIG.
When placing the original 10 on the original placing table 5, the edge of the original 10 can reliably come into contact with the tip edge of the pressing part 11b, and the original 10 can be prevented from entering the gap that occurs in the conventional device and thereby preventing the original 10 from entering the gap. damage etc. is prevented.

FIG. 8 shows an exterior cover of an image reading device according to a second embodiment of the present invention. This exterior cover 21 has notches 22 provided at right angles to each side of the opening 21c to form a plurality of elastic pressing parts 21b. Similarly to the first embodiment, the document 10 can be stably placed on the document placing table 5, and a hanging effect can be obtained.

In addition, since the tip of the pressing portion 11b mentioned above is in close contact with the document mounting table 5, it is possible to align the edge of the document with the tip of the pressing portion 11b. Shown in Figure 9. In the figure, indicators 23, 25, etc. are displayed on a pair of adjacent pressing parts 11b among the pressing parts 11b at positions corresponding to the original 10 placed on the original placing table 5. By providing the indicators 23.25 on this pressing portion 11b, the pressing portion 11b can act as a press against the original document i in FIG.
It was decided that the original finger [17
can be omitted.

(G) As described in detail, according to the present invention, pressure is applied to the four sides of the opening formed in the upper part of the outer cover so as to overlap the document mounting table provided on the main body frame when the outer cover is attached. Since the part is formed integrally with the exterior cover, by attaching the exterior cover to the main frame, the pressing part can press the original table and fix it to the document table, and the four sides of the exterior cover and A gap is prevented from forming at the contact portion with the upper surface of the document placement table, and damage to the document due to the gap can be prevented.

Furthermore, since the document placement table is pressed by a pressing portion that is integrated with the exterior cover, the pressing member that conventionally presses the document placement table can be omitted.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an image reading device to which the first embodiment of the present invention is applied, FIG. 2 is a perspective view of the same, FIGS. 5 and 6 are perspective views, FIG. 7 is a longitudinal side view showing the state in which the original is placed, FIG. 8 is a perspective view of the exterior cover showing the second embodiment of the present invention, and FIG. 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 showing main parts of a conventional exterior cover, respectively.

Claims (1)

[Claims] 1. A document mounting table disposed on the upper part of the main body frame 3, and an opening having a size in the upper part for placing the original on the document placing table, and is attached to the main body frame from above. In the exterior cover of an image reading device having an exterior cover, pressing portions are integrally formed on four sides of the opening of the exterior cover, and the pressing portions are pressed when the exterior cover is attached to the main body frame. An image reading apparatus characterized in that the document mounting table is overlapped with the document mounting table in the vertical direction, and the pressing portion presses and fixes the document mounting table on the main body frame due to the overlap. 2. Each of the pressing portions has elasticity and has a notch adjacent to the pressing portion, and when the exterior cover is attached, the pressed image reading device. 3. The image reading device according to claim 1 or 2, wherein an indicator indicating a placement position of the document is provided on one or more sides of the pressing portion.