JPS5839470Y2 - Fukushi Yakinio Kersei Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cleaning device for a copying machine that scrapes off residual toner from the peripheral wall of a photoreceptor drum.

In a copying machine, a developed image is obtained by administering developer powder made by mixing appropriate amounts of carrier and toner to a photoreceptor drum on which an electrostatic latent image has been formed, and this developed powder image is applied to copy paper. I am trying to make a copy by inverting the two.

However, all of the above toner is not used and remains as residual toner on the surface of the photoreceptor drum, so a cleaning device is provided to remove this residual toner.

Conventionally, this type of cleaning device includes a rotating brush type, a wave type, etc. In the rotating brush type, the tip of a cylindrical brush contacts the peripheral wall of the photoreceptor drum, and residual toner is scraped off by the rotation of this brush. There is.

In the wave type, a sheet made of a soft material is fixed in contact with the surface of the photoreceptor drum, and is scraped off by rotation of the photoreceptor drum.

However, the rotating brush type requires a drive device to rotate the brush, making the device itself complicated and expensive.

In addition, the wave type has the disadvantage that when scraping off toner, the toner scatters and lands on other devices, so that the toner powder collection effect is poor.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to bring one side edge of a scraping member made of a curved plate and a non-conductive tape into contact with the circumferential wall of the photoreceptor drum, thereby removing the residual residue. It is an object of the present invention to provide a cleaning device for a copying machine which is simple and inexpensive and which reduces toner scattering within the machine by scraping off toner.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, numeral 1 is a main body of the copying machine, and numeral 2 is a photosensitive document mounting table provided on the top of the main body 1, which can freely reciprocate.

Reference numeral 3 denotes an optical system including a lamp 3a, a first mirror 3b, a lens 3C, and a second mirror 3d, which are arranged opposite to the original table 2, and form a reflective optical path 4 that reflects and transmits light. .

Reference numeral 5 denotes a photoreceptor drum provided at the image forming position of the reflection optical path 4, and a photoconductive material such as Se is deposited on the peripheral wall of the photoreceptor drum.

That is, 6 is a charger, 7 is a developing device, 8 is a transfer corona device, 9 is an erasing charger, 10 is a photoreceptor cleaning device 10a to be described later, and 10a is an erasing lamp.

This cleaning device 10 is shown in FIGS. 2 and 3.

That is, one side edge 11a of a tape-shaped elastic material 11 is in contact with the peripheral wall of the photoreceptor drum 5, and this elastic material 1
A curved plate 12 is bonded to the upper surface of 1.

These elastic material 11 and curved plate 12 constitute a scraping member 13.

This scraping member 13 has roller-shaped elastic material 14 at both ends.
．． 14 and furthermore a stopper 15.1
5 and is curved.

Therefore, the non-conductive tape 11 is curved.

Further, a toner box 15a is provided below the scraping member 13 to receive the scraped toner.

On the other hand, 16 shown in FIG. 1 is a paper feeder for copy paper 17;
19 is a charger for removing charges, 20 is a fixing device, and 21 is a paper discharge table arranged opposite to the paper discharge port 22.

Next, the operation of the above embodiment will be explained.

The original is placed with the original surface facing downward on the original placing table 2, and a copy button (not shown) is pressed.

The original table 2 and the drum 5 move in the direction of the arrow in the figure, and the lamp 3a lights up.

The surface of the document is sequentially scanned by the optical system 3, and an electrostatic latent image is formed on the peripheral wall of the drum 5, which is charged by the charger 6.

The electrostatic latent image is visualized by the developing device 7, and at the same time that it faces the transfer corona device 8, the copy paper 17 is electrostatically attracted to the drum 5, and the visualized image is transferred. will be held.

This copy paper 17 is removed by a charge removal charger 19.
The charge remaining on the sheet 7 is removed, fixed by the fixing device 20, and then discharged onto the sheet discharge table 21.

On the other hand, a small amount of toner remains on the peripheral wall of the drum 5 from which the copy paper 17 has been peeled off, and the residual charge is removed from this toner, which faces the cleaning device 10.

As the drum 5 rotates, the remaining parts 1 to 1 on the peripheral wall of the drum 5 are scraped off at one side edge 11 of the elastic material 11 of the scraping member 13.
scraped off by a.

The scraped off toner then travels along the back surface of the elastic member 11 and falls into the toner box 15a to be collected.

The toner collected in this toner box 15a is reused.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and cleaning devices as shown in FIGS. 4 and 7 may be used.

That is, the elastic material 23.23 of the cleaning device shown in FIG.
is provided on the shut 25 via a one-way clutch, and can be freely rotated only in a fixed direction (counterclockwise in the figure) by rotation of the shaft 25.

Therefore, the elastic material 11 whose both ends are supported by the elastic materials 23, 23 is fixed in the clockwise direction in the drawing, and has the same scraping effect as in the embodiment described above.

Further, when the scraping portion 11a of the elastic material 11 is worn out and the contact with the photosensitive drum is weakened, the scraping effect by the elastic material 11 is reduced, for example, stains appear on the obtained copied image.

If the user determines this and manually rotates the shaft 25 counterclockwise each time, the elastic material 23
．． Together with the elastic body 23, the elastic body 11 is also rotated counterclockwise and sent to the side where it comes into contact with the photosensitive drum 5.

Therefore, even if the elastic member 11 is worn out, the scraped-off portion 11a can always be freshly brought into contact with the good contact state before the wear.

Furthermore, a long hole 27 is bored in the curved plate 26, into which a detector 28 is inserted.

This detector 28 detects the remaining amount of the elastic material 11 by touching the tip thereof to the elastic material 11. As shown in FIG. 6, when the detector 28 leaves the elastic material 11,
It is designed to indicate that the amount remaining is low.

On the other hand, the elastic material 29 of the cleaning device shown in FIG. 7 is stored in the form of a roll so that it is continuously fed even if the contact portion is worn.

As explained above, the present invention scrapes off residual toner by bringing one side edge of the scraping member into contact with the photoreceptor drum. becomes simple and inexpensive.

Furthermore, since the scraped toner travels along the curve of the elastic material, it is easily stored in the toner box without scattering around the device.

Furthermore, since the elastic material has a curved waist, it has the effect of increasing its strength.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a copying machine showing an embodiment of the present invention, FIG. 2 is a perspective view of a cleaning device in the copying machine, and FIG. 3 is a sectional view taken along line III-III in FIG. Fig. 4 is a perspective view showing another embodiment of the cleaning device, Fig. 5 is a sectional view showing a contact state between the detector and the non-conductive tape, and Fig. 6 is a non-contact state between the detector and the non-conductive tape. FIG. 7 is a perspective view of a cleaning device showing still another embodiment. 5...Photosensitive drum, 12...Curved plate, 11...Elastic material, 15a...Toner box, 13...Scraping Element.

Claims (1)

[Scope of utility model registration request] A rotating photoreceptor drum, one side edge of which is in contact with the circumferential wall of the photoreceptor drum, the curved inner surface and the other side edge of the photoreceptor drum being curved so as to face downward, and an upper portion of the photoreceptor drum that is in contact with the negative side edge of the photoreceptor drum. an elastic body that scrapes off the residual toner on the circumferential surface of the photoreceptor drum by rotation in the direction of rotation; a curved plate bonded to the upper surface of the elastic body; 1. A cleaning device for a copying machine, comprising: a toner box for receiving dropped toner.