JPH0132510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fur brush cleaning device used in an electrophotographic copying machine.

Prior Art A fur brush cleaning device has a fur brush roll disposed inside the main body of a copying machine so as to face the photosensitive material, and when used for a long period of time, the fur brush roll becomes stained with toner and needs to be replaced.

Conventionally, the fur brush roll was inserted axially into the copying machine body and attached so that it could be freely pulled out, and after the fur brush roll was pulled out axially, a new fur brush roll was inserted to replace the fur brush roll. There is.

For this reason, when pulling out the fur brush roll contaminated with toner, the toner scatters and stains the inside and surroundings of the copying machine, as well as staining the operator's hands. Since it has to be pulled out and inserted over a period of time, the work is troublesome and maintainability is very poor.

OBJECTS OF THE INVENTION It is an object of the invention to prevent toner from scattering when replacing a fur brush roll, and to enable easy attachment and detachment of the fur brush roll, thereby greatly improving maintainability.

Structure of the Invention A cleaning unit equipped with a photoreceptor and a fur brush roll is provided on a frame-shaped holding member that can be pulled out and inserted into the copying machine main body, and the cleaning unit can be freely rotated between a cleaning position and an inverted position. What was said.

Embodiment FIG. 1 is an overall perspective view, in which a frame-shaped holding member B is provided in the main body A of the copying machine so that it can be pulled out and inserted via a pair of fixed guide members 1, 1 and movable guide members 2, 2. .

The frame-shaped holding member B is a pair of vertical plate-shaped frame members 3, 3 connected at a predetermined interval by a connecting member (not shown), and a photoreceptor and a photoreceptor are connected between the pair of frame members 3, 3. A belt-shaped photosensitive material 4 is rotatably provided via a plurality of rollers 5, and a cleaning unit 6 is also provided.

The cleaning unit 6 has a cleaner main body 8, a corotron 9 for static elimination, and a corotron 10 for charging installed between a pair of frames 7, 7, and the pair of frames 7, 7 are connected to each other by a hinge mechanism 11. A pair of stoppers 12, 12 are connected to the members 3, 3 for vertical rotation, and a pair of stoppers 12, 12 are attached to the pair of frames 7, 7; a pair of fixing members 13, fixed to the pair of frame members 3, 3; When the cleaning unit 6 is rotated to the cleaning position facing the photoconductor 4, the corotrons 9, 10 and the cleaner main body 8 clean the photoconductor 4.
are positioned and rotated so as to face each other at a predetermined interval,
When rotated to a non-cleaning position away from the photoreceptor 4, each stopper 12 touches the upper surface 13 of each fixing member 13.
It is positioned and fixed by coming into contact with a.

That is, the cleaning unit 6 has a cleaning position where the fur brush rolls 21, 21' are in contact with the photoreceptor 4, and a cleaning position where the fur brush rolls 21, 21' are in contact with the photoreceptor 4.
is approximately 180 degrees between the photoreceptor 4 and the remote reversal position.
It is configured so that it can be rotated.

The hinge mechanism 11 is connected to the left and right frames 7, 7.
Although the structure is such that both ends of the support shaft 11a extending between the two are connected to the pair of fixing members 13, 13, the structure is not limited to this.

Because of this, when the frame-shaped holding member B is pulled out from the copying machine main body A and the cleaning unit 6 is turned over approximately 180 degrees via the hinge mechanism 11,
The fur brush rolls 21, 21' can be easily replaced in a short time and without scattering toner.

Therefore, the maintainability of the fur brush cleaning device is greatly improved.

The cleaner main body 8 has a pair of fur brush rolls 21 and 21' disposed within the housing 20, and the photoreceptor 4 is
The photoreceptor 4 is configured to come into sliding contact with the photoreceptor 4 to clean residual toner on the photoreceptor 4.

The details will be explained below based on FIG. 4.

The fur brush roll 21 is constructed of a cylindrical body with synthetic fibers such as acrylic fibers implanted at a rate of about 20,000/inch ² on the outer peripheral surface thereof, and rotates at about 1,200 rpm. The directions of rotation are opposite to each other,
The fur brush roll 21 on the upstream side in the direction of movement of the photoreceptor 4 rotates so as to perform a wiping action in the same direction as the photoreceptor 4, and the fur brush roll 21 on the downstream side rotates so as to perform a wiping action in the opposite direction. There is.

In Fig. 4, 22 and 22' are fur brush rolls 2.
This is a metallic frit cover which has the function of brushing off toner particles adhering to the brush fibers 1 and 21' and imprinting a desired polar charge onto the brush fibers. The frit covers 22, 22' are fixed to the housing 20, and a suction port 23 opening into the housing 20 is provided between the frit covers 22, 22'. And this suction port 23
is connected to a duct 25 via a flow path 24.
This duct 25 is connected via a hose (none of which is shown) to a dust collector having a vacuum source. 26 and 26' are electric field curtain sheets provided to prevent toner from adhering and accumulating on the inner wall of the housing 20, and 27 and 27' are electrical field curtain sheets provided to prevent toner from adhering and accumulating on the inner wall of the housing 20; This is an orifice baffle that forms a slit to prevent toner particles inside the housing 5 from leaking out of the cleaning device.

The corotron 9 for static elimination consists of a corotron wire 9a and a shield 9b, and the corotron 9 for static elimination generates a current of 400 Hz and 0.09 to 0.23 μA·sec/cm ^{2 .}
AC corona irradiation and 0.046μA・sec/cm ² plus
DC corona irradiation and static elimination lamp 2
8, the photoreceptor 4 is neutralized.

As a result, the toner on the photoreceptor 4 is processed to be easily cleaned. Further, among the pair of frit covers 22 and 22', the fur brush roll 2 is located on the upstream side in the moving direction of the photoreceptor 4.
A DC voltage of minus 3 KV is applied to the frit cover 22 on the upstream side that contacts 1, and a DC voltage of plus 3 KV is applied to the frit cover 22' on the downstream side. Note that the polarity of the applied current is reversed when the photoreceptor 4 is made of a P-type photosemiconductor.

In the above cleaning device, the untransferred toner image remaining on the photoreceptor 4 is treated with corona irradiation and light irradiation by the corotron 9 for static elimination and the lamp 28 for static elimination to make it easy to clean. In the cleaning device, the untransferred toner image is removed by the wiping action of the rotating fur brush rolls 21, 21' and the electric suction force, that is, the positively charged toner is cleaned by the corotron 9 for static elimination, and the toner is removed from the negatively charged toner. Toner of opposite polarity that is removed by the upstream fur brush roll 21 and not removed by the upstream fur brush roll 21 is removed by the positively charged lower fur brush roll 21'. The removed toner then scatters into the air and reaches a dust collector (not shown) through the suction port 23, flow path 24, duct 25, and hose in the vacuum source, where the toner and air are separated. Ru.

The charging corotron 10 includes a corotron wire 10a and a shield 10b, and applies a high voltage to the corotron wire 10a to irradiate the photoreceptor 4 with corona to charge it.

Effects of the Invention Toner does not scatter when replacing the fur brush roll, the fur brush roll can be easily attached and detached, and maintainability is greatly improved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an overall perspective view, FIG. 2 is a schematic sectional view thereof, FIG. 3 is a sectional view of a cleaning unit, and FIG. 4 is a detailed sectional view thereof. A is the main body of the copying machine, B is a frame-shaped holding member, 4 is a photoreceptor, 6 is a cleaning unit, and 21, 21' are fur brush rolls.

Claims (1)

[Claims] 1 Pull out the frame-shaped holding member B to the copying machine main body A,
The frame-shaped holding member B is provided with the photoreceptor 4, and the fur brush rolls 21, 21'
An electrophotographic apparatus characterized in that a cleaning unit 6 is rotatably provided between a cleaning position where its fur brush rolls 21 and 21' are in contact with the photoreceptor 4 and an inverted position where the fur brush rolls 21 and 21' are separated from the photoreceptor 4. Copy machine fur brush cleaning device.