JPS61123864A - Copying machine equipped with overhead projector - Google Patents

Abstract

PURPOSE:To project even an original such as an opaque book, etc., by providing an optical system which projects an image transferred to a transfer belt on a screen outside a copying machine and a cleaning device which erases a transferred image. CONSTITUTION:When a print button PB is operated while an original is set on an original platen 2, an image is transferred to copy paper. When, a projec tion button OB for OHP is operated, neither of a paper feed roller 28 and a fixing device 12 is driven to transfer the toner image on the surface of a photosensitive drum to the transfer belt 14 while no copy paper is fed, and when this transfer image is positioned above a Fresnel lens 16, the driving of a transparent belt 14 is stopped, and light from a light source 18 is projected, thereby enlarging and projecting the image on the screen 2 outside the copying machine. The original is replaced and a projection button B is pressed; the previously transferred image is erased by a cleaning device 29 and the newly transferred image is enlarged and displayed on the screen 24. The image on the transparent belt 14 is erased 29 with a projection and button EB.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is directed to an overhead projector (hereinafter referred to as an OH
It is called P. ) This article relates to a copying machine equipped with

(Prior art) There are many technologies that make a copying machine fully equipped with OHP by using some of the components of the copying machine, but all of them can only project OHP-specific transparent film originals, and cannot project opaque sheets or other books. When projecting a document such as the above, it is necessary to prepare an OHP document from the document in advance.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances.
The present invention aims to provide a copying machine capable of projecting even OHP originals, such as opaque sheets and books.

(Means for Solving the Problems) In order to achieve the above object, a copying machine equipped with an OHP according to the present invention includes The characteristics of 4I are that a movable transparent belt is disposed in the copying machine, and an optical system for enlarging and projecting the image transferred to the transparent belt onto a screen outside the copying machine and a cleaning device for erasing the transferred image are provided. .

(Function) According to the above configuration, by forming a latent image on the photosensitive drum and transferring the latent image to the transparent belt, it is possible to enlarge and project the transferred images of the various documents onto the screen. By feeding copy paper to the transfer device, normal copying can be performed.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. Fig. 1 shows a schematic vertical cross section of an electrostatic photocopying machine with OHP, and Fig. 2 shows an operation panel portion. In FIG. 1, numeral 1 in the figure is a copying machine main body, and an original document mounting table 2 is provided on the upper part of the main body so as to be movable back and forth in the paper feeding direction. 3 is a photosensitive drum built into the main body of the copying machine, and around it,
A charging device 4, an exposure device 51, a developing device 6, a transfer device 7, a copy paper separation device 8, and a cleaning device 9 are arranged in this order in the rotation direction R of the photosensitive drum 3.

Reference numeral 10 denotes a paper feed cassette, which is removably loaded into a cassette loading section 11. 13 is a fixing device consisting of a pair of upper and lower rollers;
This is a copy paper conveying device arranged across the entire area.

This copy paper conveying device 13 includes an endless transparent belt 14 having a width corresponding to the axial length of the photosensitive drum 3;
1st to 40th rollers 5a to 5a for moving this transparent belt 14 with its upper conveying action portion a toward the downstream side in the paper feeding direction.
15d, and the upper conveyance action section a is located between the transfer and separation devices 7 and 8 and the photosensitive drum 3.

1sh=ry A Fresnel lens having approximately the same size as the tact glass 17 is disposed between the copy paper separating device 8 and the 20th roller 51) and on the lower surface side of the upper conveyance action section a. 18 is a light source such as a halogen lamp that projects light onto the Fresnel lens 16; 19 and 20 are first and second reflecting plates provided in the copying machine main body l;
The light from 6 is reflected twice and the reflected light is sent to the copying machine body 1.
Light is projected to the outside of the copying machine through the transparent glass 21 at the top.

n is a support arm erected on the main body of the copying machine L.

A case arm is provided at the tip of this arm, and the case n is provided with a third reflecting plate for projecting the reflected light from the second reflecting plate onto the screen U, and a projection lens device. The above light source 18 and the 7th lens lens 16 and the first ~
An optical system A for OHP is constituted by the third reflection plates 19, 20, 25 and the projection lens.

In FIG. 2, PB in the figure is a print button, and when the print button PB is operated with a document set on the document table 2, a latent image is formed on the surface of the picture crystal drum 3 of the document. At the same time, toner is attached to the latent image area by the developing device 6, while the copy paper is fed from the paper feed cassette 10 to the copy paper transport device 13 by the drive of the paper feed roller 4, and the copy paper is exposed to light in the transfer device 7. The toner image on the drum surface is transferred to the copy paper, and then the copy paper is separated from the photosensitive drum surface by the copy paper separation device 8, and the copy paper is passed through the fixing device 12 and transferred to the paper output tray 2.
It is scheduled to be taken out on the 7th.

OB is a projection button for OHP, and when the projection button OB is operated, the paper feed roller and the fixing device are not driven, and charging, exposure, development, etc. are performed without copy paper being fed. A transfer step is taken, and the toner image on the surface of the photosensitive drum is transferred onto the transparent belt 14, and when the transferred image is positioned above the Fresnel lens 16, the driving of the transparent belt 14 is stopped, and , light source 18
Light is projected from the copying machine so that the transferred image is enlarged and projected onto a screen outside the copying machine.

Then, when the original is replaced as appropriate and the projection switch OB is operated, the previously transferred image is erased by the cleaning device 4, and the newly transferred image is enlarged and projected onto the screen U. Further, the transparent belt 14 is driven by the operation of the projection end button EB, and the finally projected transfer image is erased by the cleaning device 4.

It should be noted that the cleaning device 29 may be configured to be able to be switched to a non-erasing state, so that although the number of transferred images is limited, the transferred images can be enlarged and projected onto the screen U again. Transparent Pel) 1
4 is provided to adjust the amount of movement of the Fresnel lens 1.
In order to be able to perform the positioning operation of the transferred image with respect to 6, and to prevent the image of another document from being duplicately transferred onto the transferred image, in anticipation of the amount of transferred images being exceeded,
It is essential to provide control means for switching the cleaning device 4 into the erasing state and at the same time causing the transparent belt 14 to rotate at least once.

FIG. 3 shows another embodiment of the copy paper conveying device 13.

In this case, the transparent belt 14 has an end, and when one end side is connected to the 30th layer tSa, the other end side is connected to the 40th layer 15 (L), and the transparent belt 14
The amount of winding is at least sufficient to convey the copy paper from the paper feed cassette 10 to the fixing device 12, and
The third and 40th--y15C1154 are configured so that when one is under winding drive, the other is in an idle state, so that the transparent belt 14 can freely move back and forth in the paper feeding direction. be.

(Effects of the invention) As explained above, according to the OHP fully equipped copying machine according to the present invention, it is possible to not only make ordinary copies, but also to copy transparent sheet materials as well as originals for OHP. Regardless of the type of original, such as a book or book, the original can be transferred onto a transparent belt on the spot and the transferred image can be enlarged and projected onto a screen outside the copying machine.
We were able to obtain an OHP projection form without having to prepare a manuscript in advance.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a schematic vertical sectional view of an electrostatic photocopying machine with OHP, FIG. 2 is a perspective view of the operation panel, and FIG. 3 is another embodiment of a copy paper conveying device. FIG. A...Optical system, 3...Photosensitive drum, 7...Transfer device, J...Fixing device, 14...Transparent belt, 24
...Screen, 4...Cleaning device. Kai Ni〆〆marg~ -to1sa-
Hitomi 11

Claims (2)

[Claims] (1) A transparent belt that is movable in the paper feeding direction is arranged between the photosensitive drum and the transfer device and up to the fixing device, and the image transferred to the transparent belt is transferred to a screen outside the copying machine. A copying machine equipped with an overhead projector comprising an optical system for enlarging and projecting the transferred image and a cleaning device for erasing the transferred image. (2) The copying machine according to claim 1, wherein the cleaning device is switchable to a non-erasing state.