JPH0287177A - Copying machine - Google Patents

Abstract

PURPOSE:To readily obtain normal and reverse pictures on copying paper by one copying machine by providing both an original illuminating light source for forming a reverse picture and a light detecting means which detects light arising when an original illuminating light source in the copying machine main body is lit and lights the original illuminating light source of forming a reverse picture. CONSTITUTION:A light box 3 is selectively loaded onto the copying machine main body 1, and under this condition the box is arranged on an original platen 2. The light detecting means composed of a light detecting sensor 23 detecting light from a light source when the original illuminating light source 11 on the copying machine main body 1 is lit is provided in the light box 3. When the original illuminating light source 11 lights up, the light detecting sensor 23 in the light box 3 detects the light therefrom, lights the original illuminating light source 4 for forming a reverse picture, and turns off the lighting original illuminating light source 11 on the copying machine main body. After a series of copying procedures is executed, a reverse picture on copying paper can be obtained. Thus, one copying machine can readily provide normal and reverse pictures on copying paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying machine in which a light box is attached to the main body of the copying machine.

[Conventional technology]

When making copies using a copying machine, the original is usually placed on a document table with the image side facing down.

On the other hand, although it is an irregular usage, 1 For example, if you copy an original with an image drawn on a light-transmitting sheet and place it on the document table with the image side facing upward, a reverse image with the left and right sides reversed will be copied. You can get paper.

It is often done in the workplace to obtain copies of reverse images by reversing the left and right sides of blueprints, anime drawings, etc. drawn on the manuscript table, but this usage is irregular, and it is difficult to use light as a manuscript. If paper with poor transparency is used, the copied image will be too light, making it impossible to obtain the desired image.

[Problem to be solved by the invention]

Therefore, it is possible to obtain a reverse image by adding a mirror to the exposure optical system installed between the original and the photoreceptor, but in this case, the amount of movement of the mirror can be adjusted. By adding a mirror, you need a quick-action mechanism etc.

Light transmission efficiency decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying machine that can easily produce both normal image and reverse image copy paper without changing the optical configuration of the copying machine main body.

[Means to solve the problem]

To achieve the above object, a copying machine according to the present invention is provided with a light-transmissive document table on which an original is placed, and a light-transmitting document table in the main body of the copying machine. a document illumination light source for illuminating the document placed on the document table on the image surface side;

A light box is attached to the copying machine body and placed above the document table in the attached state.A light box is provided in the light box and is placed on the document table with the image side facing upward when forming a reverse image on copy paper. A document illumination light source for forming a reverse image that illuminates the document to be printed on the image side, and a document illumination light source for forming a reverse image that is installed in the light box and detects the light accompanying the lighting of the document illumination light source of the copying machine main body. The device is characterized by comprising a light detecting means for turning on the light source.

〔Example〕

The present invention will be explained below based on one embodiment.

In FIG. 1, a document table 2 provided at the top of a copying machine main body 1 is made of a light-transmissive plate such as transparent glass, and a light box 3 is provided so as to straddle the top. The light box 3 is attached to the upper part of the outer cover on the front and rear sides of the copying machine main body 1 with screws or the like.

FIG. 2 is a partial cross-sectional view of the copying machine shown in FIG.
is provided. Inside the light box 3, a blower fan 5, a control box 6, and the like are also provided. A circuit system (not shown) for light intensity adjustment control is provided in the control box 6, and the light intensity of the document illumination light source 4 can be adjusted by rotating the light intensity adjustment knob 7 shown in FIG. It has become.

In FIG. 3, a document illumination light source 11 consisting of a light source such as a fluorescent lamp and a reflector provided on the back of the copying machine body 1 is provided.

When performing normal copying, the original 0 is placed on the original table 2 as shown in the figure, with the image surface facing downward.

When a print button (not shown) is turned on, the document table 2 moves to the right in the figure.
At this time, the document illumination light source 11 irradiates the document moving with the document table.

A light image reflected from the surface of the document as a result of this light irradiation passes through an imaging optical element 12 such as a convergent light transmission array, and forms an image on a belt-shaped photoreceptor 13, which is an example of a configuration of a latent image carrier. be projected. The surface of the photoreceptor 13 is already uniformly charged by the charger 14, and by projecting the above-mentioned optical image onto this charged surface, an electrostatic latent image is formed on the photoreceptor. .

This electrostatic latent image is visualized by a developing device 15, and this developed image is transferred onto copy paper (transfer paper) 17 fed from a paper feed section 16 or a manual paper feed section 10. Thereafter, the copy paper is separated from the photoreceptor 13, passes through the fixing device 18, and is discharged outside the machine as copy paper. A normal normal image is formed on the copy paper thus obtained.

The original illumination light source 11 is turned on when performing such normal copying, and illuminates the original placed with the image side facing down on the image side.

Here, when obtaining a reverse image copy paper using the copying machine, the light box 3 is attached to the copying machine main body 1 in advance. Although it is possible to fix the light box 3 to the copying machine main body 1 in a non-removable manner, it is also possible to attach the light box 3 to the main body 1 in a detachable manner as in the illustrated copying machine. After removing the light box 3, attach the pressure plate (not shown) to the pressure plate mounting part 19 (FIG. 1).
If installed on the machine, it can be used as a normal copying machine. In this way, the light box 3 can be selectively attached to the copying machine main body 1, and in this attached state, it will be placed above the document table 2.

Here, as shown in FIG. 3, when the document illumination light source 11 on the side of the copying machine main body 1 is turned on, the inside of the light box 3
A light detection means consisting of a light detection sensor 23 for detecting light from this light source is provided. In other words, the light detection sensor 23 is provided in the light box at a location where the light can be detected.

Here, in order to obtain copy paper with a reversed image, place the original O on the original platen 2 with the image side facing upward, and press the print button (not shown) provided on the operation section 21 (FIG. 1). When turned on, the document illumination light source 11 on the copying machine main body side lights up, and the document table 2 moves to the right in the figure.

When the original illumination light source 11 is turned on, the light detection sensor 23 in the light box 3 detects the light from the original illumination light source, and turns on the original illumination light source 4 for forming a reverse image. and,
When the document table 2 begins to move and before the leading edge of the document O reaches the document scanning area facing the imaging optical element 12, for example, an appropriate timer is used to turn on the document illumination on the copying machine main body side, which has been turned on until now. The light source 11 is turned off.

For example, an original on which an image is drawn on a sheet that allows light to pass through is placed on the document table 2. When this original is moved together with the document table 2, the directionality is strengthened by the reflection plate 8. The light from the image forming document illumination light source 4 passes through a diffuser plate 9 made of frosted glass or the like and is irradiated onto the image surface of the passing document 0. After that, the light is transmitted through the document and reaches the imaging optical element 12. The light enters the photoreceptor 13, passes through this, and enters the photoreceptor 13.

After that, the above-described series of copying processes is executed to obtain a reverse image copy paper.

As described above, according to this embodiment, it is possible to easily obtain both normal image copy paper and reverse image copy paper using a second copying machine. You can also install a light box in your existing copying machine by providing a section in advance.

It can be easily installed, and by only partially changing the control mode for the original illumination light source 11, it is possible to easily obtain a copy sheet with a reversed image.

By the way, when obtaining a copy paper with a reverse image using a conventional copying machine, as shown in FIG. The original is illuminated by the original illumination light source 11, but in this case, the light from the original illumination light source 11 passes through the original 0 and the original table 2 twice, and after passing through the original The energy of the light becomes considerably attenuated.

Therefore, the resulting copy paper has a low density, making it impossible to obtain a copy paper with the desired density.

On the other hand, when a light box like this embodiment is used, the light from the document illumination light source 4 passes through the document O and the document table 2 only once, as shown in FIG. 5(B). Therefore, copy paper with a desired density can be obtained even with originals having poor light transmittance to some extent.

In addition, in this embodiment, the light intensity of the original illumination light source 4 for forming a reverse image can be adjusted, so for example, when using an original with poor light transmittance, adjustments such as increasing the light intensity can be made. be able to.

Furthermore, the light box 3 is removable from the copying machine body 1, so when obtaining a normal image copy of a document, the light box 3 can be removed from the main body 1 and operated in exactly the same way as a normal copying machine. Can be done.

Also, when obtaining a copy paper with a normal image while the light box 3 remains attached to the copying machine main body 1 (hereinafter).

[For normal copy mode], for example.

Unplug the power plug 24 shown in FIG. 2 from the outlet. Therefore, in such a mode, even if the original illumination light source 11 in the copying machine main body is turned on and the light detection sensor 23 on the light box side is turned on, the original illumination light source 4 will not be turned on.

Note that, for example, on the operation unit 21 shown in FIG.

A key (not shown) is provided to be pressed when attempting to obtain a reverse image copy sheet. When this key is pressed, the original illumination light source 11 on the copying machine main body side is turned on, and then the timer as described above is activated. A mode is executed in which the document illumination light source 11 is turned off by the means.

In this example, the light detection sensor 23 is connected to the document illumination light source 11.
Since the device is designed to detect light from the machine and turn on the original illumination light source 4, a command is sent between the copying machine main body 1 and the light box 3 to turn on the original illumination light source 4 in a timely manner. The advantage is that there is no need to connect a harness or the like for transmitting signals. Therefore,
There is no need to install a connector between the two for the connection. In the end, the light box can be operated electrically independently and has high reliability.

FIG. 6 is a timing diagram when executing the reverse image forming mode.
The light detection sensor is turned on, and accordingly, the document illumination light source for reverse image formation is turned on, and the document illumination light source of the copier main body is turned off before copying starts. In example.

The light is set to turn off after copying is complete.

FIG. 7 shows a control flow when executing the above mode, and in this example, the lighting and extinguishing operations of both light sources 4 and 11 are performed respectively via timers.

FIG. 8 shows a circuit block diagram corresponding to the above embodiment,
When the document illumination light source 11 of the copying machine main body 1 is turned on, the light detection sensor 23 detects this light.

This activates the light source lighting circuit, and after the timer controls the document illumination light source 4 on the light box 3 side,
Turn it on or turn it off.

In addition, in the case of the normal copying mode, in addition to unplugging the power plug 24 shown in FIG. 2, the above-mentioned light source lighting circuit may be turned off.

By the way, even in the normal copy mode, if you place the original on the document table with the image side facing down and leave the original illumination light source 11 on the copying machine body side turned off, the original in the light box 3 Even if the illumination light source 4 is turned on, it is possible to obtain copy paper with a normal image.

Incidentally, in the embodiments described so far, a type of copying machine in which the document table is moved is applied.

The present invention can also be applied to a copying machine with a fixed document table as shown in FIG.

A light box 103 is installed above the document table 102 at the top of the copying machine main body 101 so as to cover the document table.
Two document illumination light sources 104 are provided. This light box 103 may be fixed to the copying machine main body 101 in a non-removable manner.

In this example as well, the light box 103 is detachably attached to the main body 101 so as to be selectively attached thereto. In the figure, reference numeral 106 is a control box, 107 is a light amount adjustment knob, and 109 is a control box.
This is a diffuser plate such as frosted glass.

When executing the normal copy mode, the copying machine main body 101
Side document illumination light source 111. The first mirror 122 and the second and third mirrors
The mirrors 123 and 124 move forward in the direction of the arrow, and the document O is illuminated and scanned by the document illumination light source 111 of the mirrors. The scanning light image at this time is the first mirror 122.
Second mirror 123, third mirror 124. Lens 125.
Fourth mirror 126. Fifth mirror 127. 6th mirror 12
8 and enters onto the drum-shaped photoreceptor 113. As a result, an electrostatic latent image is formed on the photoreceptor 113, which is developed by the developing device 115. ) is transcribed. After this transfer, the transfer paper passes through the fixing device 118 and is discharged outside the machine.

Even in such a copying machine, when obtaining a reverse image copy paper, the document illumination light source 111 on the copying machine main body 101 side
By turning on the document illumination light source 104 on the light box 103 side is turned on via the above-mentioned photodetection sensor. Then, the document illumination light source 111 of the copying machine main body is turned off at the timing mentioned above, and in this state, the first mirror 1
22 and the like, the light from the original illumination light source 104 passes through the original O and enters the first mirror 122 .

In this way, the present invention can be applied to a copying machine with a fixed document table and a movable exposure optical system, as well as a copying machine that uses photosensitive paper as copying paper and exposes it directly. The present invention can also be applied to

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily obtain both normal image and reverse image copy paper with one copying machine without changing the optical configuration of the copying machine main body. , it is possible to obtain copy paper with a reversed image even for originals with relatively poor light transmittance. Also, between the copier body and the light box,
There is no need for electrical connections such as harnesses, and the light box can be operated independently electrically.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a copying machine according to an embodiment of the present invention, FIG. 2 is a partially cutaway side view of the copying machine shown in FIG. FIG. 4 is an internal configuration diagram of a copying machine according to another embodiment, and FIGS. Fig. 6 is a timing diagram when executing the reverse image mode corresponding to each of the above embodiments, Fig. 7 is a diagram showing a control flow when executing the same reverse image mode, and Fig. 8 is a circuit block corresponding to the above embodiment. It is a figure showing an example. 2.102... Original table 3.103... Light box 4.104... Original illumination light source for forming a reverse image 11.11
1... Original illumination light source 23... Light detection sensor/

Claims (1)

[Scope of Claims] A light-transmissive document table on which a document is placed, and a light-transmitting document table provided in the main body of the copying machine. A light source for illuminating the original for illuminating the original; a light box installed in the main body of the copying machine and placed above the document table in the installed state; A document illumination light source for inverse image formation that illuminates the image side of a document placed on the document table with its side facing upward; and a document illumination light source provided in the light box that accompanies the lighting of the document illumination light source in the copier main body. What is claimed is: 1. A copying machine comprising: a light detecting means for detecting a light source for illuminating a document for forming a reverse image.