JPS6015067B2 - Electrophotocopy machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that copies large originals such as JISA2 size and JISAI size in a one-to-one size.

Conventionally, in this type of copying machine, as shown in FIG. 1, when a document 1 is closely held on a document drum 2 and passes through an exposure section 3, its optical image is projected onto a photoreceptor drum 5 by a lens 4. After that, a toner image is created on the photoreceptor drum 5 by known means. It is known that this image is transferred by known means onto a light photographic material 6 that is fed in synchronization with the toner image, and this is fixed by a fixing device 7 to obtain a copying machine for the original 1. Here, 8 is a charger, 9
is a developing machine. JISA says that a copying machine with the above structure
It is possible to copy large originals such as 2 size and JISAI size in a 1:1 size, but in order to obtain a copy image of the same size as the original in this way, the exposure unit 3, charger 8, developing machine 9, etc. Each component that takes part in a series of electrophotographic processes requires a length L that is at least the same as the width t of the document.

(Figure 2) For this purpose, the manuscript must be JISA2 size, JISA
If the size is I size, etc., each component requires a length L of 60 m or more, so each component becomes large and expensive, making the entire copying machine large and expensive. have.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce the size of a large original by one to one, even if it is short compared to the width of the original. An object of the present invention is to provide an electrophotographic copying machine capable of making copies at a glance.

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

An illumination member 12 is provided opposite the document drum 11,
The reflected light is projected onto the photosensitive drum 14 via the lens 13.

Around the photoreceptor drum 14, a developing device 15, a charger 16,
A transfer device 17 is provided, 18 is a transfer material fed by a feeder 19, and 20 is a fixing device.

The original drum 11 is rotated in the direction of the arrow a by a drive source (not shown), and a screw is cut in the boss portion to be screwed into the screw punch 21. along the arrow b direction. Further, the photoreceptor drum 14 is rotated in the direction of arrow c by a drive source (not shown), and a screw is cut in the post portion to be screwed into the screw hole 22, so that the photoreceptor drum 14 is rotated while being rotated. It is moved along the village 22 in the direction of arrow d.

Here, the drive source of the document drum 11 and the drive source of the photosensitive drum 14 are the same, and have the same rotation speed and the same direction (arrow a).
, in the direction of arrow c), and since the pitches of the screw holes 21 and the screw holes 22 are equal and are cut in opposite directions, the original drum 11 and the photosensitive drum 14 are rotated by the same distance in opposite directions ( move in the directions of arrows b and d).

Further, the illumination member 12, lens 13, charger 16, and developing device 15 are fixed to the main body of the copying machine, and the transfer device 17 has the same length as the photoreceptor drum 14, and the photoreceptor drum 14 moves to the final position. It is fixed at the position that matches when the

Next, the operation will be explained. When an original (not shown) is brought into close contact with the original drum 11 and the original drum 11 and the photoreceptor drum 14 are rotated, and the illumination section 12 illuminates the original, the original drum 11 and the photoreceptor drum 14 move in opposite directions at the same speed. move at equal speeds, approaching each other in opposite directions while rotating at the same speed.

For this purpose, the original on the original drum 11 is scanned in a spiral manner, and a corresponding toner image is created on the photosensitive drum 14 in the same spiral manner.

When the photoreceptor drum 14 reaches the final position and scanning is completed, the transfer material 18 is fed by the feeder 19, and the toner image on the photoreceptor drum 14 is transferred to the photoreceptor drum 14 by the transfer device 17.
The document is transferred from above onto the transfer material 18, and then passed through two fixing devices to make a copy of the document in close contact with the document drum 11 in a one-to-one size. In this way, since the document drum 11 and the photosensitive drum 14 are moved relative to the illumination means 12, lens 13, and charger 16, the length L of the illumination means 12 and charger 16 is made smaller than the width of the document. Even if it is shortened, the original can be copied in a one-to-one size. Next, another embodiment will be described with reference to FIGS. 5 and 6.

The original drum 11 and the photosensitive drum 14 are rotatably and fixed in the longitudinal direction and are disposed facing each other, and a pair of upper and lower longitudinal guide villages 23 and 24 is provided between them.
, 24 so as to be movable in the longitudinal direction, and a belt 28 wound around the drive pulley 26 and idler pulleys 27, 27 is hooked to the movable body 26, so that the drive pulley 2
When the movable body 2 is driven by the power source 29, the belt 28
5 is configured to move in the longitudinal direction along guide villages 23 and 24. The movable body 25 is provided with an illumination member 12, a lens 13, a charger 16, and a developing device 15, and the lens 13 is a cylindrical lens whose refractive index distribution in the cross-sectional direction continuously changes parabolically from the center outward. A large number of these are closely arranged in a straight line, and the outside is made of a suitable material for housing to form an east-centering optical transmission body.

With the above structure, the movable body 2
5 in the longitudinal direction, a toner image corresponding to the original can be created on the photoreceptor drum 14.

Thereafter, the transfer material 18 is fed to the photosensitive drum 14, transferred by the transfer device 17, and fixed by the fixing device 20, thereby making it possible to obtain a copy corresponding to the original.

Therefore, even if the lengths of the illumination unit 12, charger 16, and developing device 15 are shorter than the width of the original, the original can be copied in a one-to-one size. Since the present invention is configured as described above, even if the constituent elements that share a series of steps of electrophotography are made shorter than the width of the original, it is possible to handle large originals on a one-to-one basis.
It can be copied at a ratio of . Therefore, the copying machine can be made small and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a front explanatory view of a conventional example, FIG. 2 is a plan view, FIG. 3 is a front explanatory view showing an embodiment of the present invention, and FIG. 4 is a plan view.
FIG. 5 is a perspective view of another embodiment, and FIG. 6 is an enlarged perspective view of the main part. 11 is a document drum, 12 is an illumination means, 13 is a lens, 1
4 is a photosensitive drum, 15 is a developing machine, and 16 is a charger. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. In an electrophotographic copying machine configured with a document drum 11, a photosensitive drum 14, and components that share a series of processes of electrophotography, such as an illumination member 12, a lens 13, and a charger 16, the document drum 11 The axial lengths of the photosensitive drum 14 and the photosensitive drum 14 are made the same, and the lengths of the respective components are made shorter than the axial lengths of the original drum 11 and the photosensitive drum 14. are configured to rotate at the same speed, and each component is moved relative to the document drum 11 and photoconductor drum 14 in the axial direction of the document drum 11 and photoconductor drum 14. An electrophotographic copying machine characterized by the following.