JPS60128480A - Brush cleaning device of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To suck toner efficiently by supporting a pair of flicker bars by elastic bodies between a pair of fur brushes for toner cleaning and vibrating the flicker bars in accordance with the rotation of the fur brushes. CONSTITUTION:An image carrier 1 is destaticized 12, and while carrying residual toner, reaches to fur brush 4, 4' parts. The brush 4 rotates in the same direction as the image carrier and the brush 4' rotates reversely to brush and scrap up the residual toner and send the collected toner to the flicker parts 22, 22' supported by supporting members 21 consisting of the elastic bodies. The flicker parts 22, 22' are vibrated by the fur brushes 4, 4', separate the toner from the brushes and carry the toner from a suction port 7 to a duct 9 through a passage 8. Thus, the residual toner is efficiently washed without dropping the toner on the carrier 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses two fur brush rolls, and has a pair of seven flicker covers in contact with each of the two fur brush rolls, and a distance between the two flicker bars. B. The present invention relates to a brush cleaning device for an electrophotographic copying machine, which uses a vacuum source to suck up the toner cloud scattered by the wiping action of the fur brush roll.

BACKGROUND OF THE INVENTION A brush cleaning device for an electrophotographic copying machine of the type described above is shown in FIG. This is wrapped around tension rolls 2 and 2' and platen roll 3 and 3'. Reference numerals 4 and 4' designate a pair of fur brush rolls that are in contact with the image carrier 1 and whose rotating shafts are perpendicular to the moving direction of the image carrier 1;
The fur brush rolls 4 and 4' are constructed by planting about 2,000 synthetic fibers/male on the outer circumferential surface of the fur brush rolls 4 and 4', and rotate at about 120 rpm. The rotating directions are opposite to each other, and the fur brush roll 4 on the downstream side is rotated so that the fur brush roll 4 on the upstream side in the moving direction of the image carrier 1 acts in the same direction as the image carrier 1.
1 rotate in opposite directions so as to perform a wiping action. 5 is a housing that covers the fur plan roll 4I41, 6 and 6' are the fur brush rolls 4
, 41 brush fibers, and the role of imparting a desired polarity to the brush fibers. The flicker bars 6 and 61 are fixedly attached to the housing 5, and a suction lower opening into the housing 5 is provided between the flicker bars 6 and 6'. This suction lower is then connected to the duct 9 via a flow 88. This duct 9 is connected via a hose (none of which is shown) to a dust collector having a vacuum source.

10, IO' is a field curtain provided to prevent toner from adhering and accumulating on the inner wall of the housing 5), II, II' is a boundary between the image carrier 1 and the housing 50.
This is an orifice baffle that forms a slit with a high flow rate of air between the two ends and prevents toner particles inside the housing 5 from leaking out of the cleaning device. 1
2 is a pre-cleaning corotron consisting of a cleaning corotron wire +3 and a corotron shield 14. This pre-cleaning corotron 12 is 400E.
Z, 0, 09~O, 231eA-,? ec/cm
2 AC corona irradiation and 0.046μ74sec/ctw
2 plus J) C corona irradiation is performed, whereby the residual toner image on the υ image carrier 1 is treated so as to be easily cleaned. In addition, among the pair of flicker bars 6 and 61, the upstream flicker 6 that contacts the fur brush roll 4 located upstream in the moving direction of the image carrier 1 has a negative 3J, and the downstream 7
A DC voltage of plus 3 g is applied to each of the Ritz covers G.

Note that the polarity of the applied current is reversed when the image carrier 1 is a P-type optical semiconductor.

In the above cleaning device, the untransferred toner image remaining on the image carrier 1 is removed by the pre-cleaning corotron 12.
After being treated with corona irradiation to make it easier to clean, the untransferred toner image is removed in the cleaning device by the wiping action and electric attraction of the rotating fur brush rolls 4, 4', i.e., The cleaning of the positively charged toner in the pre-cleaning corotron 12 is removed by the negatively charged upstream fur brush roll 4;
The toner of opposite polarity that is not removed is removed by the positively charged fur brush roller 4' on the downstream side. This removed toner is then scattered into the air, and reaches the dust removal device (not shown) from the source through the suction lower, flow path S, Talito 9, and Bose, where the toner and air are separated. be done.

In such a self-contained brush cleaning device, high DC voltages of different polarities are constantly applied to the two flicker bars 6 and 6' while the copying machine is in operation, which prevents flicker. Charged toner particles passing between the bars tend to adhere to each other due to Coulomb force and other adhesion forces such as van der Waals force, surface tension, and chemical bond force.

The air flow path between the two flicker bars 6.6' has a width of 2.5~
The length of the cleaning device is 3 mm, and it forms a slit over approximately the entire length of the cleaning device (400 m→), and the wind speed within this slit is approximately 5ψtc.

When a voltage is applied to flicker halo 61, the positively charged toner becomes negative again in the flicker halo 6 to which a negative voltage is applied? ? The toner that is on the other side of the flicker bar 61 is attracted to the side surface of the other flicker bar 61 by Coulomb force. In this case, a single wind speed of 5 m/st, c cannot prevent toner from adhering and accumulating in the area of the suction lower, and once the toner has adhered, the strength of the toner will increase over time. .

On the other hand, the adhered and accumulated toner is removed from the 7-ring cover 6.6'.
When the supply of voltage is stopped, the adhesion force due to Coulomb force is weakened. Therefore, if the copying machine is stopped with toner adhering to the flicker bar, this adhering toner may be transferred to the image carrier due to vibrations etc. when the copying machine is stopped. It had fallen onto 1 and was causing dirt of II1 quality.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a highly reliable brush cleaning device that prevents toner from adhering to the flicker bar and does not adversely affect image quality.

Structure of the Invention In order to achieve the above-mentioned object, the electronic copy 1 (copying machine brush cleaning device) according to the present invention includes a flicker bar 20,
The supports 21 and 21' of the fur brush rolls 4 and 4' are made of elastic material, and the sifter cover is moved by the rotating contact of the fur brush rolls 4 and 4'.
20 and 20' are made to vibrate.

EXAMPLE Hereinafter, a beautiful example of the present invention will be explained based on FIGS. 2 and 3. In this embodiment, the same parts 4 as those of the brush cleaning device shown in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.

The main part of the present invention is a pair of flicker bars 20 shown in FIG.
20' is used, the flicker bar 20, 2
0' is the flicker part 22°22' at the tip and the elastic support 2
1 and 21', and is fixed to the center of the housing 5 so as to form a suction lower. The flicker parts 22 and 22' of this flicker bar 20° 20' are in contact with the fur brush rolls 4 and 4', and vibrate while in contact with the rotation of the fur brush rolls 4 and 41, respectively. . Further, each flicker bar 20, 20' receives the rotational force of the fur brush rolls 4, 41, and the elastic support 20, 20'
1, 21' by the elastic force of the shift lever portions 22, 22'.
In other words, the flicker part 22 deforms to the left in the drawing, and the flicker part 221 deforms to the right. When the rotation of the fur brush roll 4°4' is stopped, the flicker bar 20°20' will stop at its original position.

By providing such flicker bars 20 and 20', the toner adhering to the flicker bars 20 and 20' is dropped by vibration and guided from the suction lower to the duct 9 via the flow path 8. This prevents toner particles from adhering to and accumulating on the side walls of the 201.

Effects of the Invention As described above, in the brush cleaning device for an electrophotographic copying machine according to the present invention, the flicker bars 20, 20
The supports 21 and 21' are made of an elastic material, and the fur brush rolls 4 and 4' are brought into rotational contact with each other.
, 20' were made to vibrate, so the flicker bar 20
, 20', and the toner particles do not accumulate on the image bearing member 1. As a result, the toner particles do not fall onto the image carrier 1, and as a result, problems such as image quality stains that occur in conventional electrophotographic copying machines are avoided. Therefore, the image carrier 1 can be cleaned with high reliability over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional brush cleaning device.
FIG. 2 is a cross-sectional view showing an example of a brush cleaning device according to the present invention, and FIG. 3 is an enlarged cross-sectional view of a flicker bar used in the present invention. 1 is an image carrier, 4 and 4' are fur brush rolls, 5 is a housing, 7 is a suction port, 6, 6', and 20. 20' is a flicker bar, 21 and 21' are supports, 22
゜22' is the flicker part. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto Figure 1 Figure 2 Figure 3 tl 221

Claims (1)

[Claims] Fur brush roll 4, 4! In a brush cleaning device for an electrophotographic copying machine in which toner-containing air is allowed to pass between a pair of flicker bars 20 and 20' to which DC high voltages of different polarities are applied, , 20' supports 21, 2
A brush cleaning device for an electrophotographic copying machine, characterized in that flicker bars 20 and 20' are made of an elastic material, and flicker bars 20 and 20' are vibrated by the rotational contact of fur brush rolls 4 and 41.