JPH10197972A - Original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an original reader in which a gap between the leading end of the scale part of an original scale and the surface of an original platen glass is not produced even though glass is deflected, and which can be easily separated in the case of diassembling. SOLUTION: This device has an original platen glass 1, and the original scale 21; and the scale 21 is constituted of a scale base part 21a and the scale part 21b. A projection 21c is formed on the part 21a, and a recessed part 22 is formed between the projection 21c and the part 21b. A level difference is formed on the end part 1a of the glass 1, the thickness T is larger than the width (t) of the part 22, and the part 1a is inserted inside the part 22 so as to be brought into press-contact and interposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original reading apparatus having an original platen glass and an original scale used in a copying machine, a facsimile machine, and the like, and more particularly, to an original reading apparatus in which the original scale does not rise from the original platen glass. About.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a configuration of a conventional document reading apparatus. In FIG. 1, an original table glass 1 on which an original a is placed is mounted on an upper surface of a housing 2. Housing 2
The first traveling body 3, the second traveling body 4, the reading lens 5, and the light receiving section 6 are attached inside the inside.

[0003] The first traveling body 3 is provided with an illumination lamp 7 and a first mirror 8, which integrally read a document on the platen glass 1 while scanning in the direction of the arrow in the figure.
The second traveling body 4 has a second mirror 9 and a third mirror 10
Are arranged so as to be orthogonal to each other. The second traveling body 4 also moves in the direction of the arrow in the drawing when reading the original, but at half the speed of the first traveling body 3. Light receiving section 6
Is arranged at an image forming position of the reading lens 5 and converts an original image into an electric signal. An original scale 11 is attached to the left side of the original platen glass 1. This is to indicate at which position the original should be set by bringing one end of the original a into contact with the original table glass.

When a document a is placed on the platen glass 1 in accordance with an instruction from the document scale 11, the first traveling body 3 moves in the direction of the arrow and starts scanning, and at the same time, the second traveling body 4 moves.
Also starts moving at half the speed of the first traveling body 3.

The original is illuminated by an illumination lamp 7 of the first traveling body 3, and light reflected from the original is transmitted to a first mirror 8 and a second mirror 8.
The light is sequentially reflected by the mirror 9 and the third mirror 10, enters the reading lens 5, and forms an image on the light receiving unit 6. As the first traveling body 3 scans over the document, the light receiving section 6 reads the image of the document and converts it into an electric signal.

Thereafter, the light receiving section 6 converts the image information into laser light or the like, and forms an electrostatic latent image of the original image on a photosensitive drum (not shown). Then, the image is developed with toner, transferred onto a sheet, and fixed, so that a copy of the original is completed.

FIG. 6 is an enlarged view of the original scale 11 and the original platen glass 1 shown in FIG. As shown in FIG. 1, the original scale 11 is formed by projecting a plate-like scale portion 11 b from a scale base 11 a substantially parallel to the original table glass 1, and a scale bracket 13 fixed to the housing 2 with screws 12. It is fixed with screws 14. The document table glass 1 is on a projection 2 a as a spacer protruding from the upper surface of the housing 2.

The original scale 11 is integrally formed of plastic or the like and has flexibility. The tip of the scale portion 11b gradually increases in thickness toward the original platen glass 1, and the tip end thereof is placed on the original platen glass. In a relationship that goes down from the top of 1,
The scale tip was pressed into contact with the glass and intended to adhere to the glass. With this configuration, when the original scale 11 is fixed to the housing 2 with the screw 14, the tip of the scale portion 11b is pressed against the upper surface of the original platen glass 1 so as to bend.
There is no gap between the scale 11b and the platen glass 1.

[0009]

However, in practice, when the original scale 11 is pressed to bring the original platen glass into close contact with the original platen glass, the original platen glass 1 may be bent. When the platen glass 1 is bent, a gap is formed between the scale portion 11b and the platen glass 1, especially around the center of the length of the scale in the depth direction of the drawing, and the document may fall into this gap. there were. When the document sneaks in, the document set becomes skewed, the force is released when trying to take the document, and the gap disappears.A part of the document is sandwiched between the scale tip and the glass, and the document is lifted. There was a problem that the manuscript was sometimes beaten. On the other hand, the tip of the scale portion 11b of the original scale 11 is sometimes attached to the original table glass 1 with a double-sided tape or the like.

However, if the scale portion 11b is attached to the platen glass 1, there is a problem that it is difficult to disassemble at the time of maintenance, and it is difficult to separate and collect because of the dissimilar materials being combined when collecting as waste. Was. The present invention
The purpose is to solve the above-mentioned problems and problems, and the gap between the tip of the scale portion of the original scale and the platen glass surface does not occur even if the glass is bent, and it is easy to separate when disassembling. It is intended to propose a document reading device.

[0011]

In order to achieve the above object, the present invention comprises a platen glass and a document scale provided at an end of the platen glass. In a document reading apparatus including a scale base and a scale protruding from the base in a direction substantially parallel to the surface of the platen glass, a protrusion protruding in a direction substantially parallel to the scale is formed on the scale base at a distance. The end of the platen glass is pressed and held in a recess formed between the projection and the scale.

A step is formed at an end of the platen glass to be fitted into the concave portion so that the thickness of the end portion is smaller than the plate thickness of the platen glass and larger than the width of the concave portion. It is desirable that the thickness of the original platen glass in the plate thickness direction be approximately the same as the thickness of the original platen glass.

Alternatively, the end of the platen glass may be an inclined surface, and the projection may contact the inclined surface, and the thickness of the platen glass of the scale base in the plate thickness direction may be defined as the thickness of the platen glass. Alternatively, the inclined surfaces may be formed symmetrically on both sides of the platen glass. Alternatively, a concave groove is formed at the center of the plate thickness of the end portion of the platen glass, and the protrusion is pressed against the side wall of the concave groove.
It may be configured as a groove.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, and corresponds to FIG. 6 described in the conventional example. In this embodiment, a step is provided at the end 1a of the platen glass 1, and a protrusion 21c is formed on the base 21a of the document scale 21 at a position separated from the scale 21b. The thickness of the end portion 1a of the platen glass 1 is represented by T, and the illustrated width of the concave portion 22 formed by the scale portion 21b and the protrusion 21c of the document scale 21 (the vertical direction between the tip of the scale portion 21b and the protrusion 21c). When (dimension) is t, T> t is satisfied.

In this case, the same can be achieved by utilizing the thickness of the glass without making a step at the end 1a of the original table glass 1. However, the illumination lamp 7 of the first traveling body 3 shown in FIG.
It is desirable that the members supporting the platen and the opposing reflection plate be as close as possible to the platen glass 1 because the light amount becomes large. Therefore, when the document scale 21 projects below the back surface of the platen glass 1, it becomes an obstacle. . for that reason,
In the embodiment of the present invention, a step is formed at the end 1 a of the original table glass 1.

With such a configuration, the screw 1
4 when the original scale 21 is fixed,
When the document is bent downward, the platen glass 1 pushes down the protrusion 21c of the document scale 21, so that the close contact between the glass and the scale portion 21b is maintained, and the generation of a gap can be prevented. In addition, since the original table glass 1 and the original scale 21 have a simple fitting structure, they can be easily separated and disassembled when parts are disassembled.

FIG. 2 shows a second embodiment of the present invention. If the ridgeline of the platen glass 1 is sharp, handling is dangerous, so the ridgeline is chamfered conventionally. In this embodiment, the size and shape of the chamfer are increased, and an inclined surface 1b is formed at the end of the platen glass 1.
The projection 21c of the original scale 21
The same effect as the embodiment of FIG. 1 is obtained. In the case of this embodiment, since the shape of the chamfering of the ridge line, which has always been performed, has been extended, the working is easy and economical.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, both sides are subjected to ridge chamfering with a specified size and shape. The feature is that the inclined surface 1b is formed symmetrically on both sides of the original platen glass 1 so that it is not necessary to distinguish between the front and back directions during assembly.

FIG. 4 is a modified embodiment of FIG. 3, and it is not necessary to discriminate the direction during assembly. That is, a V-shaped groove 1c is formed at the center of the thickness of the platen glass 1, and the protrusion 21d of the original scale 21 is brought into contact with the side wall above the V-shaped groove. Although the V-groove is used in this embodiment, the same operation and effect can be obtained by using an arc-shaped concave groove.

[0020]

According to the present invention as described above,
A scale having a platen glass and a document scale provided at an end of the platen glass, wherein the document scale protrudes from the scale base in a direction substantially parallel to a surface of the platen glass; In the document reading apparatus, a projection protruding in a direction substantially parallel to the scale portion is formed on the scale base at a distance, and an end of the platen glass is formed in a recess formed between the projection and the scale portion. Since the portion is pressed and sandwiched, even if the platen glass is bent, the contact between the leading end of the scale portion and the glass surface is maintained, and no gap is formed. Also, since there is no need for adhesion, separation is easy at the time of disassembly. Since the close contact is maintained, intrusion of dust or foreign matter into the machine can be prevented.

A step is formed at an end of the platen glass that fits into the concave portion, and the thickness of the end portion is made smaller than the plate thickness of the platen glass and larger than the width of the concave portion. When the thickness of the glass in the plate thickness direction is substantially equal to the thickness of the platen glass, an illumination lamp or the like can be arranged closer to the platen glass, and the amount of reflected light from the document can be increased.

If the end of the platen glass is formed as an inclined surface, and the projection is brought into contact with the inclined surface, it is possible to utilize the conventional ridge chamfering of glass.
Does not increase costs. If the inclined surface is formed symmetrically on both the front and back surfaces of the platen glass, or if a concave groove or a V-groove is formed, it is not necessary to distinguish between the front and back sides when assembling, and the work becomes easy.

[Brief description of the drawings]

FIG. 1A is a sectional view showing a main part of an embodiment of an original reading apparatus according to the present invention, and FIG. 1B is a partial sectional view of an original scale.

FIG. 2 is a sectional view showing a main part of a second embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a third embodiment of the present invention.

FIG. 4 is a sectional view showing a main part of a fourth embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration of a conventional document reading apparatus.

FIG. 6 is an enlarged sectional view showing a main part of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 platen glass 1a end 1b inclined surface 1c V-groove 21 document scale 21a scale base 21b scales 21c, 21d protrusion 22 recess

Claims (6)

[Claims] 1. An original platen glass, and an original scale provided at an end of the original platen glass, wherein the original scale extends from the scale base and the base in a direction substantially parallel to the surface of the original platen glass. In a document reading apparatus including a projecting scale portion, a projection protruding in a direction substantially parallel to the scale portion is formed on the scale base at a distance, and a document is formed in a concave portion formed between the projection and the scale portion. An original reading device wherein an end of a base glass is pressed and held. 2. A step is formed at an end of the platen glass to be fitted into the concave portion, and the thickness of the end portion is smaller than the plate thickness of the platen glass and larger than the width of the concave portion. 2. The original reading device according to claim 1, wherein the thickness of the original platen glass in the plate thickness direction is substantially equal to the thickness of the original platen glass. 3. An end of the platen glass having an inclined surface,
2. The original reading apparatus according to claim 1, wherein the projection is brought into contact with the inclined surface, and the thickness of the original platen glass at the base of the scale is substantially equal to the thickness of the original platen glass. . 4. The document reading apparatus according to claim 3, wherein said inclined surface is formed symmetrically on both front and back surfaces of the platen glass. 5. An original reading apparatus according to claim 1, wherein a concave groove is formed at the center of the plate thickness of said end portion of said platen glass, and said projection is pressed against a side wall of said concave groove. . 6. The document reading apparatus according to claim 5, wherein said concave groove is a V-shaped groove.