JPH0562743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a copying machine equipped with an overhead projector (hereinafter referred to as OHP).

(Prior art) A copying machine using some of the components of a copying machine.
There are many technologies for equipping OHP, but none of them
Only transparent film originals designed for OHP can be projected.
When projecting an original such as an opaque sheet or other book, it is necessary to prepare an OHP original from the original in advance.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and can be used not only for OHP manuscripts but also for manuscripts such as the above-mentioned opaque sheets and books. The objective is to provide a copying machine that can project this image.

(Means for solving the problems) OHP according to the present invention to achieve the above object
A copying machine equipped with this includes a transparent belt that is movable in the paper feeding direction between the photosensitive drum and the transfer device and up to the fixing device, and copies the image transferred to the transparent belt. It is characterized by the provision of an optical system for enlarging and projecting images onto a screen outside the machine and a cleaning device for erasing the transferred image.

(Function) According to the above configuration, by forming a latent image on the photosensitive drum of the various originals and transferring it to the transparent belt, the transferred images of the various originals can be enlarged and projected onto the screen. . and,
Normal copying can be performed by feeding copy paper to the transfer device.

(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 electrostatographic copying machine with an OHP, and Fig. 2 shows an operation panel part. 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. Reference numeral 3 denotes a photosensitive drum built into the copying machine main body 1, and around it, a charging device 4, an exposure device 5, a developing device 6, a transfer device 7, a copy paper separating device 8, and a cleaning device 9 are connected to the photosensitive drum 3 in that order. It is arranged in the rotation direction R of.

Reference numeral 10 denotes a paper feed cassette, which is removably loaded into a cassette loading section 11. Reference numeral 12 designates a fixing device consisting of a pair of upper and lower rollers, and reference numeral 13 designates a copy paper conveying device disposed from the cassette loading section 11 to the fixing device 12.

This copy paper conveying device 13 includes the photosensitive drum 3
an endless transparent belt 14 with a width corresponding to the length in the axial direction, and first to fourth rollers 15a to 15d that move the transparent belt 14 with its upper conveyance acting part a toward the downstream side in the paper feeding direction. It consists of
In addition, the upper conveyance action section a is located between the transfer and separation devices 7 and 8 and the photosensitive drum 3.

A Fresnel lens 16 is approximately the same size as the contact glass 17, and is disposed between the copy paper separating device 8 and the second roller 15b and on the lower surface side of the upper conveying portion a. 18 is a light source such as a halogen lamp that projects light onto the Fresnel lens 16;
Reference numerals 9 and 20 denote first and second reflecting plates provided in the copying machine main body 1, which reflect the light from the Fresnel lens 16 twice and pass the reflected light through the transparent glass 21 on the top of the copying machine main body 1. It projects light outside the copying machine.

Reference numeral 22 denotes a support arm erected on the copying machine body 1, and a case 23 is provided at the tip of this arm.
Further, the case 23 is provided with a third reflection plate 25 that projects the reflected light from the second reflection plate 20 onto the screen 24, and a projection lens 26, and the light source 18 and the Fresnel lens 16 are connected to each other. 1st to 3rd
The reflecting plates 19, 20, 25 and the projection lens 26 constitute an optical system A for OHP.

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 of the image of the document is formed on the surface of the photosensitive drum 3. At the same time, toner is attached to the latent image area by the developing device 6, and 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 28, and The toner image on the surface of the photosensitive drum is transferred to copy paper in the transfer device 7, and then the copy paper is separated from the surface of the photosensitive drum by the copy paper separation device 8, and the copy paper passes through the fixing device 12 and is transferred to the paper output tray 27 It is now being taken out.

OB is a projection button for OHP, and the projection button
When the OB is operated, the paper feed roller 28 and fixing device 12 are not driven, and the steps of charging, exposure, development, and transfer are performed without feeding copy paper, and the surface of the photosensitive drum is When the toner image is transferred onto the transparent belt 14 and the transferred image is located above the Fresnel lens 16, the drive of the transparent belt 14 is stopped, and light is projected from the light source 18, and the transferred image is positioned above the Fresnel lens 16. The transferred image is enlarged and projected onto a screen 24 outside the copying machine.

Then, replace the original as appropriate and set the projection switch OB.
When you operate the projection end button EB, the previously transferred image is erased by the cleaning device 29, and the newly transferred image is enlarged and projected onto the screen 24. Therefore, the transparent belt 14 is driven, and the finally projected transfer image is erased by the cleaning device 29.

Incidentally, the cleaning device 29 may be configured to be able to be switched to a non-erasing state at will, so that although the number of transferred images is limited, the transferred images can be enlarged and projected onto the screen 24 again, and in this case. , an operating tool for adjusting the amount of movement of the transparent belt 14 is provided to enable alignment of the transferred image with respect to the Fresnel lens 16, and to prevent images of another document from being overlappingly transferred onto the transferred image; Anticipating that the number of transfers will exceed, it is important to take control means to switch the cleaning device 29 to the erasing state and to rotate the transparent belt 14 at least once.

FIG. 3 shows another embodiment of the copy paper conveying device 13. In this case, the transparent belt 14 has ends, one end of which is connected to a third roller 15c, the other end of which is wound around a fourth roller 15d, and the winding amount of the transparent belt 14 is controlled. , at least enough copy paper from the paper feed cassette 10 to be conveyed to the fixing device 12, and the third and fourth rollers 15c, 15d are arranged so that when one is under winding drive, the other is idle. The transparent belt 14 is configured to be in a rolling state so that the transparent belt 14 can freely move back and forth in the paper feeding direction.

(Effects of the invention) As explained above, the copying machine equipped with the OHP according to the present invention can of course take the normal copy form, and can also copy not only originals for OHP but also opaque sheets and books. Regardless of the type of original, the original can be transferred to a transparent belt on the spot and the transferred image can be enlarged and projected onto a screen outside the copying machine. It has now become possible to take the projection form of OHP without manufacturing it.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 shows an OHP
FIG. 2 is a perspective view of an operation panel portion, and FIG. 3 is a schematic sectional view showing another embodiment of a copy paper conveying device. A...Optical system, 3...Photosensitive drum, 7...Transfer device, 12...Fixing device, 14...Transparent belt,
24...Screen, 29...Cleaning device.

Claims (1)

[Claims] 1. A transparent belt movable in the paper feeding direction is disposed between the photosensitive drum and the transfer device and up to the fixing device, and the image transferred to the transparent belt is copied. A copying machine equipped with an overhead projector comprising an optical system for enlarging and projecting onto a screen outside the machine 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.