JPS595863Y2 - Copy machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic copying machine equipped with means for increasing the smoothness of supplied paper.

Conventionally, in electronic copying machines, particularly liquid development copying machines, if the smoothness of the paper is low, there has been a problem in that the transferability of the transfer device becomes extremely poor.

In order to solve the problem of the above-mentioned inconvenience, it is necessary to make the paper with high smoothness.

However, producing paper with high smoothness increases costs and has the disadvantage that it is extremely difficult to use commonly used paper for special purpose paper.

The present invention was developed in view of the above circumstances, and its purpose is to provide a means for smoothing the paper in the paper feeding path between the paper feeding device and the transfer device using paper with low smoothness. It can increase the smoothness of low-smooth paper set in the supply tray and improve transfer performance, and it can be easily installed in any electronic copying machine and provides good transfer performance regardless of the low smoothness of the paper. An object of the present invention is to provide an electronic copying machine that can perform the following functions.

As shown in FIGS. 1 to 3, the present invention interposes a paper smoothing roll 14 between the delivery roll 2 and the register roll 4, so that the paper delivered by the delivery roll 2 is After the surface is smoothed by a smoothing roll 14 having a total roll pressure of 10 kg/Cfn or more, the electrostatic latent image is transferred to the register roll 3, where it is formed on the photosensitive drum 5. The drum 5 is adjusted to the correct position and sent out in synchronization with the rotation of the drum 5.

On the other hand, the surface of the photosensitive drum 5 is uniformly charged at the charging section A, and then imagewise exposed at the exposure section B, and the electrostatic latent image thus formed is transferred to a xerographic developing material containing toner at the developing section C. When the developed xerographic image reaches the transfer section D, the paper passes between the drum 5 and the transfer device 6 in synchronization with the rotational speed of the drum 5.

At this time, the xerographic image on drum 5 is electrostatically transferred.

At this time, the higher the smoothness of the paper, the better the transferability.

The transferred paper passes through one turn roll 7 and is transferred to transport roll 8
The toner image on the paper is transported to the fixing device 9 by the toner, and while passing through the fixing device 9, the toner image on the paper is melted by heat or soaked into the paper and fixed.

Next, the present invention will be explained with reference to specific examples.

Example 1 As shown in FIG. 2, a smoothing roll 14 is used to smooth paper with a surface smoothness of about 20 seconds fed out from a supply tray 1 by a feeding roll 2 and with a roll pressure of 40 kg/cm.
As a result of measuring the smoothness of the paper after passing through it, the smoothness of the paper was as high as about 70 seconds.

Furthermore, the copy density after this highly smooth paper was transferred on the photosensitive drum 5 was about 30% higher than the copy density when the paper was transferred without passing through the smoothing roll 14. .

In addition, the table below shows a comparison between the results of running the paper on a liquid development copying machine equipped with means for smoothing the paper of the above structure, that is, a smoothing roll, and the results of running the paper on a normal liquid development copying machine.

From the above table, it is clear that the transferability is better when the paper smoothing means according to the present invention is used in the paper feeding path between the paper feeding device and the transfer device.

The relationship between the smoothness of the paper immediately before transfer and the copy density is the fourth
As shown in the graph in the figure, it is almost proportional, and from the graph in FIG. 5, the relationship between the roll pressure and the amount of increase in paper smoothness is also almost proportional.

Therefore, even if the paper on the supply tray has low smoothness, the smoothness of the paper can be increased appropriately by applying smoothing roll pressure to an appropriate level, thereby improving transfer properties such as copy density. .

Therefore, according to the present invention, the smoothing roll pressure is the amount of increase in smoothness required to increase the copy density by about 0.05.
A total roll pressure of 10 kg/Cm or more is employed, which yields a total roll pressure of 10 kg/Cm.

Example 2 As shown in FIG. 3, paper with a surface smoothness of about 30 seconds is sent out from the supply tray 1 by the delivery roll 2, after passing through four rows of smooth rolls 14 at a roll pressure of 8 kg/crn. As a result of measuring the smoothness of the paper, the smoothness of the paper was approximately 75.
It was getting higher by the second.

Furthermore, the copy density of this highly smooth paper after being transferred on the photosensitive drum 5 was about 29% higher than the copy density when the paper was transferred without passing through the four rows of smoothing rolls 14. .

A comparison with the results obtained by running a liquid development copying machine equipped with a means for smoothing paper of the above structure is also shown below.

From the table above, it is clear that the use of the smooth roll according to the present invention is better.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing an electronic copying machine. FIG. 2 is a partial sectional view of a smooth roll according to an embodiment of the present invention. FIG. 3 is a partial cross-sectional view of another embodiment of the present invention in which four rows of smooth rolls are used. FIG. 4 is a graph showing the relationship between paper smoothness and copy density. FIG. 5 is a graph showing the relationship between the smoothing roll pressure and the amount of increase in paper smoothness. Symbols in the figure: A... Charged part, B... Exposure part, C...
Developing section, 1... Supply tray, 2... Delivery roll, 3
...Register roll, 4...Squeeze roll, 5
... Photosensitive drum, 6... Transfer device, 7... Turn roll, 8... Conveyance roll, 9... Fixing device, 1
0... Paper discharge roll, 11... Paper discharge tray, 12...
Cleaning roll, 13...Cleaning plate, 14...Smooth roll.

Claims (1)

[Scope of utility model registration request] In an electronic copying machine having a paper feeding device and a device for transferring an image formed on a photoreceptor to the paper fed by the paper feeding device, the paper between the paper feeding device and the transfer device is provided. A copying machine characterized in that smooth rolls with a total roll pressure of 10 kg/cm or more are provided in a feeding path.