JP2655140B2 - Copier - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a copying machine to which a light box is selectively mounted.

2. Description of the Related Art When making a copy using a copying machine, it is common to place a document on a platen with the image side facing down. On the other hand, it is an unusual usage, for example, when copying a document with an image drawn on a light transmissive sheet with the image side facing up on the platen, the inverted reverse copy paper is Obtainable.

It is often done in workplaces etc. to obtain reverse copy paper by inverting design drawings and animation drawings drawn on the platen, but such usage is irregular,
If a paper having poor light transmittance is used as a document, a copy image becomes thin, and a target image cannot be obtained.

Therefore, a mirror may be additionally provided in the exposure optical system provided between the original and the photoconductor to obtain a reverse image. However, in this case, the mirror may move forward and backward. For this purpose, a driving mechanism is required, and the addition of a mirror lowers the light transmission efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying machine capable of easily obtaining both a normal image and a reverse image copy sheet without changing the optical configuration and the like in the copying machine body. It is in.

Configuration In order to achieve the above object, the present invention provides a light-transmitting platen on which a document is placed on an upper surface, and is provided in a copying machine main body,
A document illuminating light source that is turned on to illuminate a document placed on a document table with its image surface facing down on the image surface side when a normal image is formed on copy paper, and is turned off when a reverse image is formed on the copy paper. And a light box which is detachably fixed and mounted on the copying machine main body, and which is provided above the platen in the mounted state, and which is provided inside the light box and forms a reverse image on copy paper. Reverse image formation that is turned on to illuminate the original placed on the platen with the image side facing up on the image side, and is turned off when a normal image is formed on copy paper with the light box mounted. A document illumination light source for use, and a light amount adjustment knob attached to the light box so as to be operated from the outside of the light box and rotated to adjust the light amount of the document illumination light source for forming the reverse image. With To propose a copying machine.

Examples Hereinafter, the present invention will be described based on one example.

In FIG. 1, a document table 2 provided on an upper portion of a copying machine main body 1 is formed of a light-transmitting plate such as a transparent glass, and a light box 3 is provided so as to straddle the plate. The ride box 3 is detachably attached to the front of the copying machine body 1 and the upper part of the outer cover on the back side by screws or the like.

FIG. 2 is a partial cross-sectional view of the copying machine of FIG. 1 viewed from the direction of arrow A.
A document illumination light source 4 for forming a reverse image, such as a halogen lamp, is provided. Inside the light box 3, a blower fan 5, a control box 6, and the like are provided. In the control box 6, a circuit system (not shown) for light amount adjustment control is provided.
As shown in the figure, the light box 3 is provided with a light amount adjusting knob 7 operated from the outside, and the light amount of the document illumination light source 4 can be adjusted by rotating the knob 7. I have.

In FIG. 3, a document illuminating light source 11 composed of a fluorescent lamp is provided in the copying machine main body 1, and a reflection plate is provided on the back thereof.

Here, when performing normal copying, the document O is placed on the document table 2 as shown in the figure with the image surface facing down. When a print button (not shown) is pressed, the original table 2 moves rightward in the figure. At this time, the original illuminating light source 11 emits light to the original moving with the original table. Done.

The light image reflected from the document surface due to the light irradiation passes through an image forming optical element 12 such as a converging light transmitting body array and is formed and projected on a belt-shaped photoconductor 13. The photoconductor 13 is already uniformly charged by the charging charger 14, and the above-described optical image is projected onto the charged surface, whereby an electrostatic latent image is formed on the photoconductor.

This electrostatic latent image is visualized by the developing device 15, and the visualized image is transferred to copy paper (transfer paper) 17 sent from the paper supply unit 16. Thereafter, the copy paper is separated from the photoreceptor 13 and is discharged as a copy paper outside the apparatus through the fixing device 18. An ordinary normal image is formed on the copy paper thus obtained.

The original illuminating light source 11 is turned on when performing such a normal copy, and illuminates the original placed on the image side downward on the image side.

As described above, the illustrated copying machine has a light-transmissive platen 2 on which an original is placed, and is provided in the copying machine main body 1. A document illumination light source 11 that is turned on to illuminate a document O placed on the document table 2 in a downward direction on the image surface side is provided.

Here, when obtaining a copy sheet of a reverse image using the copying machine, the light box 3 is attached to the copying machine body 1 in advance. In this state, connect the electrical connectors. Since the light box 3 is detachably fixed to the copier main body 1, the light box 3 can be easily attached and detached. (FIG. 1), the normal copy mode as described above can be executed. As described above, the ride box 3 is selectively mounted on the copying machine main body 1, and in this mounted state, the ride box 3 is disposed above the document table 2.

On the operation unit 21 shown in FIG. 1, there is provided a key which is pressed to obtain a reverse copy sheet. When this key is pressed, the document illumination light source 11 in the copying machine main body 1 is turned off, and Document light source 4 for forming a reverse image in light box 3
Lights up. The document illumination light source 11 is turned off when a reverse image is formed on the copy paper.

After or before turning on the document illumination light source 4 for forming the reverse image, the document O is placed on the document table 2 with the image surface facing upward as shown in FIG. As the manuscript O,
For example, a sheet on which an image is drawn on a sheet allowing light transmission is used. It is advantageous that the four corners of the original on the original table 2 are clamped by appropriate clampers so that the original does not move on the original table. When the print button described above is pressed in this state, the document table 2 moves to the right.
At this time, the light from the reverse image forming original illumination light source 4 whose directivity has been enhanced by the reflection plate 8 passes through the diffusion plate 9 such as frosted glass, and is irradiated on the image surface of the original O passing therethrough. After that, the light passes through the original and enters the image forming optical element 12, passes therethrough, and enters the photosensitive member 13.

After that, the above-mentioned series of copying process is executed,
An inverted image copy paper is obtained. As described above, the document illumination light source 4 for forming the reverse image is turned on when obtaining a copy sheet of the reverse image, and illuminates the document placed with the image surface facing upward on the image surface side. However, when normal copying is performed with the light box 3 attached, the light is automatically turned off.

As described above, the illustrated copying machine is detachably fixed and mounted on the copying machine main body 1, and in the mounted state, the document table 2 is mounted.
And a light box 3 provided inside the light box 3 and an original O placed on the platen 2 with the image surface facing upward when an inverted image is formed on the copy paper 17 when the reverse image is formed on the copy paper 17. A document illumination light source 4 for forming a reverse image, which is turned on to illuminate the front side and is turned off when a normal image is formed on the copy paper 17 with the light box 3 mounted.

According to this embodiment, both a normal image copy sheet and a reverse image copy sheet can be easily obtained by one copying machine.
If a light box mounting portion is provided in an existing copying machine in advance, the light box can be easily mounted, and a reverse image copy sheet can be easily obtained.

Further, since the light box 3 is detachable from the copying machine body 1, when obtaining a normal image copy from a document, the light box 3 can be removed from the body 1 and operated in exactly the same manner as a normal copying machine. it can.

The illustrated copying machine is attached to the light box 3 so as to be operated from outside the light box 3,
A light amount adjusting knob 7 that is rotated to adjust the light amount of the original image illuminating light source 4 for reverse image formation is provided so that the operator can freely adjust the light amount of the original image illuminating light source 4 for reverse image formation. Therefore, for example, when a document having poor light transmittance is used, adjustment such as increasing the amount of light can be performed.

When a reverse copy sheet is obtained by a conventional copying machine, as shown in FIG. 5A, the original O is placed on the document table 2 with the image surface facing upward, and The original illumination light source 11 illuminates the original. In this case, the light from the original illumination light source 11 is transmitted twice through the original O and the original platen 2 for convenience. Light energy is considerably attenuated. Therefore, copy paper having a low density is obtained, and a copy paper having a desired density cannot be obtained.

On the other hand, when the light box as in the present embodiment is used, the light from the document illumination light source 4 only passes through the document O and the document table 2 once, as shown in FIG. Therefore, it is possible to obtain copy paper having a desired density even for an original or the like having a poor light transmittance to some extent.

By the way, in the embodiments described so far, the copying machine of the type in which the document table is moved is applied. However, the present invention can be applied to a copying machine of a fixed document table as shown in FIG. it can.

A light box 103 is mounted on the platen 102 at the top of the copier body 101 so as to cover the platen,
In the light box 103, four original illumination light sources 104 for forming a reverse image are provided. This light box 103
Is to be selectively attached to the copier body 101,
It is attached detachably. In the figure,
106 is a control box, 107 is a light amount adjustment knob, and 109 is a diffusion plate such as frosted glass.

When performing normal copy mode, the light box
The original illumination light source 104 on the 103 side is turned off, and in this state, the original illumination light source 111 and the first mirror 122 on the copier main body 101 side.
And the second and third mirrors 123 and 124 move forward in the direction of the arrow, and the illumination light of the original O is scanned by the original illumination light source 111 among them.
Then, the scanning light image at this time includes the first mirror 122, the second mirror 123, the third mirror 124, the lens 125, the fourth mirror 126, and the fifth mirror 126.
The light passes through the mirror 127 and the sixth mirror 128 and enters the drum-shaped photoconductor 113. Thereby, the photoconductor 113
An electrostatic latent image is formed thereon, and this is visualized by a developing device 115, and the visualized image is transferred to copy paper (transfer paper) sent from one of the paper feeding units 116 and 117. After this transfer,
The transfer paper is discharged out of the apparatus through the fixing device 118.

Also in the copying machine of such an example, when obtaining a reverse copy sheet, the original illuminating light source 111 of the copying machine main body 101 is turned off and the original illuminating light source 104 of the light box 103 is turned on. Then, while the former document illumination light source 111 remains off, the light from the document illumination light source 104 passes through the document O while the first mirror 122 and the like move, and the first mirror 122
Incident on.

As described above, the present invention can be applied to a copy machine with a fixed document table and a movable exposure optical system. The present invention is applicable.

Advantageous Effects According to the present invention, both a normal image and a reverse image copy paper can be easily obtained with a single copying machine without changing the optical configuration or the like of the copying machine body at all. It is possible to obtain a reverse copy sheet even for a document having relatively poor light transmittance.

When a normal image copy is to be obtained, the light box can be removed from the copier body, so that the box does not interfere.

Further, since the light box is provided with a light amount adjusting knob, the operator can freely adjust the light amount of the original illuminating light source for reverse image formation in accordance with the light transmittance of the original, so that the light is always displayed on the copy paper. A high-quality reverse image can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a copying machine according to one embodiment of the present invention, FIG. 2 is a partially cutaway side view of the copying machine shown in FIG. 1, viewed from the side, FIG. FIG. 4 is a diagram showing the internal structure of a copying machine according to another embodiment, and FIGS. 5A and 5B are diagrams used to explain the difference between the conventional example and the light transmission system according to the embodiment of the present invention. . 2,102 original platen, 3,103 light box 4,104 original light source for reverse image formation, 11,111 original light source 7,107 light intensity adjustment knob

Continuation of the front page (56) References JP-A-62-270946 (JP, A) JP-A-58-172655 (JP, A) JP-A-58-106577 (JP, A) JP-A-59-137941 (JP) , A) JP-A-57-88445 (JP, A) JP-A-64-15730 (JP, A) Fully open Showa 63-8740 (JP, U) Fully open Showa 53-100942 (JP, U) Really open 60-26046 (JP, U) Fully open 1988-60143 (JP, U) Fully open 1988-35040 (JP, U)

Claims (1)

(57) [Claims] A light-transmitting platen on which a document is placed; and a light-transmitting platen provided in the copying machine main body. When a normal image is formed on a copy sheet, the platen is placed on the platen with the image side facing down. A document illumination light source that is turned on to illuminate the original to be imaged on the image side and is turned off when a reverse image is formed on the copy paper, and is detachably fixed and mounted on the copier main body. A light box provided on the upper side, and provided inside the light box, when forming a reverse image on copy paper, to illuminate a document placed on a platen with the image surface facing upward on the image surface side. A document illumination light source for forming a reverse image, which is turned on and is turned off when a normal image is formed on copy paper in a state where the light box is mounted, and the light box is operated from outside the light box. Attached to the reverse image A copying machine comprising: a light amount adjusting knob that is rotated to adjust the light amount of a document illuminating light source for forming.