JPS59147373A - Lubricant supplier for copying machine - Google Patents

Abstract

PURPOSE:To prevent variation in electric characteristics of a developer by supplying a lubricant onto the surface of a drum between a transfer process and a blade cleaning process. CONSTITUTION:An electrostatic latent image is formed on the photosensitive drum 2 by image exposure 3 and it is transferred to a copy form 8 by a transferring device 9. The photosensitive drum 2 after the transfer is supplied with a lubricant 11 charged electrostatically to the polarity opposite to that of the latent image potential from a lubricant supplier 12; and then the residual toner is scraped off by a blade cleaner 13 and the residual charges are removed by a destaticization lamp 14. The brush 17 of the lubricant supplier 12 charges the lubricant 11 by contacting a counter bar 16 and generates a turbulent flow of the lubricant 11 at the same time to facilitate the sticking of the lubricant to the photosensitive drum 2. For this purpose, the brush 17 is made of a very elastic material and provided to high density.

Description

[Detailed Description of the Invention] [1] Technical Field The present invention relates to changes in the electrical characteristics and deterioration mechanism of a developer.
The present invention relates to a lubricant supply device for a copying machine that prevents.

[2] Prior Art In conventional copying machines, for example, is there a particulate lubricant or film in the developer? There is one in which an Xl lubricant is mixed to reduce the friction between the blade edge and the drum surface when the blade cleans the remaining toner on the photosensitive drum after transfer.

According to such a copying machine, since the friction between the blade edge and the drum is reduced, it is possible to suppress the curling up of the blade edge and local damage, thereby removing the toner remaining on the drum surface after transfer. It can be scraped effectively,
Moreover, it is possible to prevent problems such as noise and increase in occupied area or power consumption that occur during brush cleaning.

However, in such copying machines, the lubricant changes the thermal characteristics and deterioration mechanism of the developer (for example, it affects frictional charging), making it difficult to maintain and manage the copying machine. There is a risk of

[3] Object and structure of the invention The present invention has been made in view of the above.In order to prevent changes in the electrical characteristics and deterioration mechanism of the developer, lubrication is applied to the drum surface between the transfer process and the blade cleaning process. The present invention provides a lubricant supply device for a copying machine that supplies a lubricant.

The lubricant supply device for a copying machine according to the present invention will be explained in detail below.

[4] Embodiment FIGS. 1 and 2 show an embodiment of the present invention 12. A photosensitive drum 2 is provided inside the main body 1 of the close-up photographing machine. A charging device 3 that applies a predetermined charge, an exposure optical system 4 that forms an electrostatic latent image by applying light to the charged photosensitive drum 2 according to the document, and the photosensitive drum 2
a developing machine 5 that develops the electrostatic latent image of the soil with toner and visualizes it;
A pre-transfer lamp 6 that lowers the image potential of the photosensitive drum 2 to facilitate transfer; a transfer device 9 that transfers the toner image onto copy paper 8 conveyed by a paper conveyor 7;
A static eliminator 10 is disposed immediately after the transfer device 9 to reduce the charge on the copy paper 8; a lubricant supply device 12 supplies a lubricant 11 made of fluororesin onto the photosensitive drum 2; A plate cleaning device 13 for scraping off residual toner and a charge eliminating lamp 14 for eliminating residual charges on the photosensitive drum 2 are provided.

Further, a paper conveyor 15 is provided downstream of the static eliminator 10 to guide the copy paper 8 that has undergone the transfer to a fixing section (not shown).

The lubricant supply device 12 supplies the lubricant 11 as shown in FIG.
The brush 17 has a brush 17 made of a charging material, for example, an epoxy resin, which houses the lubricant 11 and charges the lubricant 11 to a polarity opposite to the potential of the photosensitive drum 2.
It has a counter 16 which is driven into contact.

In the above configuration, the operation will be explained as follows.

When a document is placed on the platen and a start key is turned on, the photosensitive drum 2 charged by the charger 3 is subjected to image exposure by the exposure optical system 4 to form an electrostatic latent image. After this electrostatic latent image is developed with toner by the developing device 5, the potential is lowered by the front transfer lamp 6, and the potential is lowered by the transfer device 9.
(The copy paper 8 is neutralized by the static eliminator 10 and discharged from the main body after being fixed.)

The photosensitive drum 2 that has completed the transfer is supplied with the flij lubricant 11 charged to the opposite polarity to the potential of the latent image from the lubricant supply device 12, and then the remaining toner is scraped off by the blade cleaning device 13. After the static elimination lamp 14
(in preparation for the next copy operation). As described above, the brush 17 of the lubricant supply device 12 charges the lubricant 11 through contact with the counterper 16 and at the same time generates a turbulent flow of the lubricant 11 to facilitate adhesion to the photosensitive drum 2 . In order to generate this electrification and turbulence, it is preferable that the brushes 17 be made of a highly elastic material and provided with high density.

[5] Effects of the Invention In the above embodiments, a sufficient amount of the lubricant 11 adhered to the photosensitive drum 2 was obtained at a residual potential of +5° and 78°.

As explained above, according to the lubricant supply device for a copying machine according to the present invention, since the lubricant is supplied onto the drum surface between the transfer process and the push cleaning process, the developer is Changes in electrical characteristics and deterioration mechanisms can be prevented.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention;
The figure is an enlarged view of the main parts in the explanatory diagram of FIG. 1. Explanation of symbols 1... Copying machine body, 2... Photosensitive drum, 3
... Charger, 4... Exposure optical system, 5...
Developing machine, 6... Front transfer lamp, 7... Paper conveyor, 8... Copy paper, 9... Transfer device, JO... Static eliminator, 11... Lubricant,
12... Lubricant supply device, 13... Blade cleaning device, 14... Static elimination rung, 15... Paper transport device, 16... Counter bar, 17...
brush.

Claims (1)

[Claims] A visible image obtained by developing an electrostatic latent image on the photosensitive drum with a developer containing no lubricant is transferred to copy paper (-1) In a copying machine configured to clean the remaining developer after transfer with a blade, the photosensitive drum and a means for accommodating a lubricant for reducing friction between the transfer means and the blade cleaning means, and a means for supplying the lubricant onto the photosensitive drum between the transfer means and the blade cleaning means. lubricant supply device.