JPS59107372A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To obtain an inexpensive and small-sized copying device which is capable of copying a light-transmissive original by making the light-transmissive original adhere closely to a photosensitive body through a transparent insulating original supporting body, and exposing the photosensitive body by the passing light of the light-transmissive original. CONSTITUTION:When a light-transmissive original 10 is inserted toward the right from the left, the light-transmissive original 10, an original supporting body 5 and the outside circumferential surface of a drum 2 move as one body in an exposure area 4. The outside circumferential surface of the drum 2 charged in advance by an electrifier 3 is exposed by a light of an exposure light source 8, which passes through the light- transmissive original 10 and the transparent original supporting body 5, and an electrostatic latent image is formed. This electrostatic latent image is developed by a developing device 13 by the clockwise rotation of the drum 2, and also transferred to a transfer medium 15 by a transfer device 14. When the final end of a toner image passes through the transfer device 14, a cutter 19 cuts the transfer medium 15, and the toner image is fixed by fixing devices 20, 20a and carried out to the outside of a body 1. In this way, it is possible to obtain an inexpensive and small-sized copying device which is capable of copying the light-transmissive original.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic copying apparatus for copying translucent originals.

Electrophotographic copying devices are generally manufactured for the purpose of copying non-transparent originals that do not allow light to pass through.

Therefore, when attempting to copy a translucent original or a semi-transparent original such as lithographic film, the light irradiated onto the original does not reflect well, making it impossible to copy with good image quality.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inexpensive and downsized electrophotographic copying apparatus that can copy translucent originals.

The structure of the present invention constituting this object includes: a movable and exposed electrophotographic photosensitive member; A film-like document support that is transparent and has an M5 edge that can move closely and synchronously; and a translucent document that moves in close contact with the electrophotographic photoreceptor through the document support in the exposure area. The present invention is characterized in that it irradiates light from the opposite side of the electrophotographic photoreceptor to cure the above-mentioned ``exposure light source that forms an electrostatic warm body on the surface of the electrophotographic photoreceptor.''

Hereinafter, the present invention will be briefly explained based on the examples shown in the drawings. As shown in the 6° diagram, a rectangular parallelepiped-shaped main body 1 is placed over a substantially medium heat with its upper part protruding above the main body 1 to form an electrophotographic photoreceptor. A drum 2 is provided. The drum 2 has a cylindrical shape and is rotated at a constant speed in the direction of the arrow by a drive motor (not shown). A charger 3 for charging the outer peripheral surface of the drum 2 is provided on the left side of the drum 2 in contact with the drum 2.

In this embodiment, a charger based on a corona charging method is used, but the charger is not limited to this, and for example, a charger based on a known charging method such as a frictional charging method may be used. The portion of the drum 2 that protrudes above the main body 1 is an exposure area 4, and a document support 5 is provided in the exposure area 4, which contacts the outer peripheral surface of the drum 2 and moves in synchronization with the rotation of the drum 2. It will be done. The document support 5 is supported by a pair of rollers 6 and 7, and moves from the roller 6 to the roller 7 1. In the exposure area 4, the document support 5 is exposed to light from an exposure light source 8, which will be described later, and the outer periphery of the drum 2. A film-like member is used that is transparent so that it can reach the surface of the drum 2 and has an insulating property so that the electric charge charged on the outer periphery 1 of the drum 2 does not escape.

In this way, the translucent IQ 'pt14 io is transferred to the drum 2 via the document support 5 which rotates and moves together with the tram 2.
(Insert the translucent original 10 or main body 1 from left to right in the folded state.) At this time, the translucent gland IIM 10
Light is irradiated from the opposite side of the drum 2, and the light passes through the translucent original 10 and the original 4'f4 support 5.

An exposure light source 8 is provided directly above the drum 2 to form an electrostatic latent image on the outer peripheral surface of the drum 2. An upper lid 9 is provided so that the light from the exposure light source 8 does not enter the exposure area 4. 9. The upper cover 9 is curved at the top of the main body 1 with a gap large enough for the translucent original 10 to pass through.9. At the same time, a long slit 11 is provided in the upper shoe 9 in the narrow direction of the drum 2 so that the light from the exposure light source 8 is irradiated only onto the exposure area 4 41. A cover 12 is placed around the % exposure light source 8. A developing device 13 for developing the electrostatic latent image formed in the exposure area 4 is provided on the right side of the drum 2. The developing device 13 is used to develop toner on the outer circumferential surface of the drum 2, and can use known developing methods such as -component magnetic brush development, two-component magnetic brush development, and liquid development. A normal development method in which toner is deposited and a reversal development method in which toner is deposited on uncharged areas can be arbitrarily used. A transfer device 14 transfers the toner image formed on the outer peripheral surface of the drum 2 onto a transfer medium 15. As the transfer device 14, one using a known transfer method such as a corona charging method or an electrode contact voltage application method can be used. The transfer medium 15 is sent to the left in the figure by a pair of rolls 17 and 18 that rotate in synchronization with the drum 2, and is cut into 9 predetermined lengths by a cutter 19. 120
is a fixing device that fixes the toner image transferred to the transfer medium 15, and uses a known fixing method such as heat fixing or pressure fixing (1
) can be done. A cleaner 21 removes toner remaining on the outer peripheral surface of the drum 2 after the toner image has been transferred to the transfer medium 15.

Next, the operation of such a device will be explained. When the copy switch (not shown) is turned on, the drum 2. The rolls 6.7 begin to rotate synchronously, and the translucent original 10 is placed to the right from the pressure shown in the figure. and move together in the exposure area 4.

The outer peripheral surface of the drum 2 is charged in advance by the charger 3 and then moved to the exposure area 4, so that the outer peripheral surface of the drum 2 is exposed to light from the exposure light source 8 that has passed through the translucent original 10 and the transparent original support 5. An electrostatic latent image is formed in the direction. At this time, either the document support 5 is in contact with the outer circumference of the drum 2, or the document support 5 is made of an insulating material, so the image of Hiro Shizutun disappears. In this way, a brush is formed on the outer circumferential surface of the drum 2, and the electrostatic latent image is developed with a magnetic brush by the developing unit 13 by clockwise rotation of the drum 2, and is transferred onto the transfer medium 15 directly below the drum 2.

In other words, when the toner image developed on the outer peripheral surface of the drum 2 approaches the transfer device 14, the roll 1 moves in synchronization with the rotation of the drum 2.
7 and 18 begin to rotate and send the transfer medium 15 to the left, so that the toner image on the outer peripheral surface of the drum 2 is transferred onto the transfer medium 15 in order. When the trailing edge of the toner image passes through the transfer device 14, the cutter 19 is activated to cut the transfer medium 15.

The toner image is fixed on the transferred transfer medium 15 by the fixing devices 20 and 208, and the transferred medium 15 is carried out of the main body 1. On the other hand, toner remaining on the outer peripheral surface of the drum 2 after passing through the transfer device 14 is removed by a cleaner 21.

Although a drum is used as the electrophotographic photoreceptor in this embodiment, the present invention is not limited to this, and a film-like material that can be wound between a plurality of rollers may also be used.

In addition, this embodiment shows an apparatus having a structure in which an electrostatic latent image formed by exposure from an exposure light source is developed with toner using a developing device, and then the toner image is transferred onto a transfer medium using a transfer device. The method is not limited to this, and a so-called electrostatic image transfer method (TESI method) can also be used. In the figure, the developing device 13 and the transfer device 14 are removed, and the transfer device transfers the electrostatic latent image formed on the outer peripheral surface of the drum 2 onto the transfer medium, and the electrostatic latent image transferred to the transfer medium is developed. The image forming apparatus may also include a developing device.

Further, if, for example, a liquid developer which can be fixed by drying is used instead of a dry toner, a fixing device is not required.

As described above with reference to the embodiments and drawings, according to the present invention, the translucency YJ and the phase are determined through the transparent and insulating original document support, and the translucent original is brought into close contact with the secondary photographic photoreceptor. Since the structure exposes the electrophotographic photoreceptor to the light that has passed through the photoreceptor, it is possible to copy transparent Sawara+1.

[Brief explanation of drawings]

The figure is a structural diagram of an electrophotographic copying apparatus according to the present invention. In the drawing 2 is the drum 3 is obi f4i, vessel 4 is the exposure area 5 is the manuscript support 8 light source 10 is a translucent original.

Claims (1)

[Claims] A movable and exposed electrophotographic photoreceptor, a charger for charging the electrophotographic photoreceptor, and a transparent and insulating film-like film that can move in synchronization with the electrophotographic photoreceptor in close contact with the electrophotographic photoreceptor at least in the exposure area. The electrophotographic photoreceptor is irradiated with light from the opposite side of the electrophotographic photoreceptor to a document support and a translucent document that moves in close contact with the electrophotographic photoreceptor through the document support in the exposure area. An electrophotographic copying apparatus comprising an exposure light source that forms an electrostatic latent image on a surface.