JPS6035064B2 - Copy paper conveyance device in electronic copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copy paper conveyance device in an electronic copying machine, and more particularly to a copy paper conveyance device that has a toner image on its surface before being fixed.

Conventionally, as shown in FIGS. 1 and 2, the means for conveying a copy sheet 1 having a toner image 2 on its surface before being fixed to a fixing device 3' uses static electricity (force) from the opposite side of the toner image surface.
The copy paper 1 is sucked by a vacuum or a vacuum (force), and the frictional force between the roller 4'' or the belt 4' which is in contact with the back side of the copy paper 1 is increased, thereby conveying the copy paper 1. However, the electrostatic type copy paper conveying device shown in FIG. 1 has a weak conveying force due to the influence of the environment, particularly humidity, and the electrostatic conveying blade also weakens when sheets are fed in duplicate. On the other hand, the vacuum type copy paper conveying device shown in FIG. 2 has a disadvantage that the device is complicated and therefore its cost is high.

The present invention has been made in view of the above circumstances, and its purpose is to have a simpler structure and lower cost than conventional electrostatic type and vacuum type copy paper conveying devices, as well as to reduce the amount of toner. It is an object of the present invention to provide a highly reliable copy paper conveying device in an electronic copying machine that does not cause transfer to copy paper.

The present invention will be explained below with reference to FIGS. 3 to 5.

In the figure, reference numeral 3 denotes a roller on the toner image surface side that has a material and surface condition to which the toner 5 does not easily adhere, and this roller 3 is a metal roller with a mirror-finished surface. roller 3
The width is determined from practical considerations, but in experimental examples it is about 1 to 2 willows.

The roller 3 is fixed to a support shaft 8, and the support shaft 8 is supported by a frame (not shown).

4 is a roller on the non-image side of the copy paper 1 that contacts the non-image surface la of the copy paper 1, and this roller 4 only functions to sandwich and convey the copy paper 1 with the roller 3; The material and surface condition are not particularly limited, and rubber or metal rollers may be used.

This roller 4 is fixed to a support shaft 9, and the support shaft 9
is supported on the frame.

Moreover, although either of the rollers 3 and 4 may be driven, the lower roller 4 may be driven and the upper roller 3 may be brought into contact with the roller 4 by its own weight.

In the drawing, 6 is a cleaner, and this cleaner 6 is supported by a support member 7, which is fixed to a frame or the like.

Although a Mylar plate can be used as the cleaner 6 if the set pressure is set to a good condition, a rubber plate is easy to set and has an excellent cleaning effect.

The cleaner 6 is in contact with the surface of the roller 3 with a set pressure, and as shown in FIG. 5, the distance L between the contact position of the cleaner 6 and the gripping portion of the copy paper 1 of the rollers 3 and 4 is set as small as possible. ing.

In this way, copying defects are less likely to occur even without a toner tray, and the roller 3 can be easily attached and detached. When the copy sheet 1 having an unfixed toner image 2 is conveyed between the rollers 3 and 4, the toner image 2 adheres to the surface of the roller 3 in large amounts.

However, the amount of adhesion varies depending on the material of the roller 3 and the surface condition, and in some cases, the amount is so noticeable that it is difficult to judge visually. However, no matter how much the toner 5 adheres to the roller 3, in the absence of the cleaner 6, the toner 5 is transferred to the white portion of the copy paper 1 and stains the copy surface. However, in the case of the present invention, a cleaner 6 is provided to prevent the toner 5 from being transferred to the copy paper 1.

It should be noted that the scraped off toner 5 is extremely small in quantity, so even if it falls onto the image surface of the copy paper 1, it does not stain the image surface to the extent that it degrades the image quality. As described in detail above, the present invention includes a roller 3 on the toner image side that sandwiches the copy paper 1 having the unfixed toner image 2 and conveys the copy paper 1 by rotation, and a roller 4 on the non-image side of the copy paper. and a plate-shaped cleaner 6 that slides against the surface of the copy paper transport side of the roller 3 on the toner image surface side to drop the toner 5 onto the image surface of the copy paper 1. The roller 3 is made of metal, and the inside of the roller 3 on the toner image surface side is formed extremely small, and the peripheral surface of the roller 3 on the toner image surface side is formed to have a mirror surface. This is characterized in that the distance L between the contact position with the roller 3 and the gripping portion of the copy paper 1 of the roller 3 on the toner-image side and the roller 4 on the non-image side of the copy paper is set as small as possible. Therefore, compared to conventional electrostatic type and vacuum type copy paper conveying devices, the structure is simpler and the cost can be lowered.

Furthermore, there is no transfer of the toner 5 onto the copy paper 1, and there is no need for a toner tray, resulting in high reliability.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a conventional electrostatic type copy paper conveyance device, FIG. 2 is an explanatory diagram of the configuration of a conventional vacuum type copy paper conveyance device, and FIG. 3 is an explanatory diagram of the configuration of an embodiment of the present invention. ,
FIG. 4 is a perspective view of the same, and FIG. 5 is a configuration explanatory diagram of another embodiment of the present invention. 1 is copy paper, 2 is toner image, 3 and 4 are low fu, 6
is a cleaner. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 Copy paper 1 with unfused toner image 2
The roller 3 on the toner image surface side and the roller 4 on the non-image surface side of the copy paper transport the copy paper 1 by rotating between them, and the toner 5 slides on the surface of the roller 3 on the toner image surface side on the copy paper discharge side. The roller 3 on the toner image surface side is made of metal, and the width of the roller 3 on the toner image surface side is formed to be extremely small. The peripheral surface of the roller 3 on the image surface side is formed into a mirror surface, and the contact position of the cleaner 6 with the roller 3 on the toner image surface side, the roller 3 on the toner image surface side, and the roller 4 on the non-image surface side of the copy paper A copy paper conveyance device for an electronic copying machine, characterized in that a distance L between the copy paper 1 and a holding portion thereof is set as small as possible.