JPS6177875A - Rotating and moving type developing device in color image forming device - Google Patents

Abstract

PURPOSE:To prevent the scattering of a toner in a copying device during development by disposing freely movably in and out a pair of movable dustproof sealing members so as to cover both ends in the aperture of a developing sleeve, retreating the members to the inside during rotation and movement of a rotary station and advancing the members to the outside from the rotating outside diameter of the rotary station so as to approach to the outside circumferential surface of a photosensitive drum during development. CONSTITUTION:Pin members 13, 13' are simultaneously driven toward the outside of long holes 12, 12' and the movable dustproof sealing members 10, 10 are simultaneously housed into the inside from the rotating outside diameter 2' of the rotary station 2 during the rotation and movement of the rotary station 2. The contact of the members 10, 10' with the surface of the photosensitive drum 5 is therefore obviated. Pin members 13, 13' are simultaneously driven toward the inside of the holes 12, 12' and the top ends of the members 10, 10' are simultaneously advanced to the outside of the diameter 2' of the station 2 so as to approach to the surface of the drum 5 in the stage of the development. The scattering of the toner is thus prevented during the development.

Description

Detailed Description of the Invention (1') Industrial Application Field The present invention relates to a developing device for color copying and color recording devices such as copying machines and laser beam printers. The present invention relates to an improved rotational movement type developing device for an electrostatic color image forming apparatus that is capable of preventing such problems.

(L") Prior Art Conventionally, a color image forming apparatus (hereinafter simply referred to as a copying apparatus)
As shown in FIG. 3, the developing device a has a yellow Y color around a rotating S light drum b.

It consists of developing units c, d, e, and f containing toners of 4 Zenta M, cyan C, and black Bk arranged side by side.
When electrostatic latent images corresponding to each color are formed on the photoreceptor drum b constituting the image carrier, lJj images are correspondingly formed by the developing devices of each color, and the developed toner images of each color are formed. are successively superimposed and transferred onto a transfer material, that is, copy paper, on a transfer drum g, thereby forming a color image. In such a side-by-side type developing device a-, four-value developing devices C~ are placed side-by-side around the photoreceptor drum b.
The proportion occupied by f increases, and the transfer drum g1, which is arranged around the photoreceptor drum b, the cleaner h, - the next phase electric appliance! , since the space for arranging other image forming units such as the optical system J becomes narrower, the diameter of the photoreceptor drum b must be adjusted in order to maintain the space for properly arranging these other image forming units around the photoreceptor drum b. A method was adopted to increase the size of Therefore, the size of the main body of the copying device was inevitably increased, which was also a factor in increasing the cost of the copying device. Therefore, the arrangement of the current #l@c-f with respect to the photoreceptor drum b was devised to reduce the diameter of the photoreceptor drum b. In order to reduce the size of the main body of the copying apparatus and reduce the cost, a rotary moving type developing device, which will be described below, has been proposed.

As shown in FIG. 4, in the rotary moving type developing device, toners of each color, yellow Y1 macenter M1 cyan C and blank Bk, were stored in a rotating station l. 4 present (
The electrostatic latent image corresponding to each color is formed on the photoreceptor drum R in a radial manner. is rotated twice at a position facing the photoreceptor drum R, and development is performed, and the developed toner images of each color are sequentially superimposed and transferred onto the transfer material, that is, the copy paper, on the transfer drum S, and the 7-color image is formed. When each of the above-mentioned developing devices is rotated to the developing position facing the 157-body F ram l, the toner stored inside the developing device is transferred onto the photoreceptor drum r. Enlarged in Figure 5 to transfer to °C and apply.
As shown in C, a magnetic brush type developing sleeve W is arranged to protrude slightly and face the photoreceptor drum r through an opening 2, and the present I! When the toner is transferred toward the surface of the photoreceptor drum r by the rotation of the sleeve W, or the i-toner is collected back into the developing device without being transferred to the surface of the photoreceptor drum 17. In order to prevent the toner from scattering inside the copying device ml when the developing sleeve W is being used, a cover member
, x' are fixed. In this way, by configuring the developing device k as a rotationally movable type, the cleaner t1-order charger U can be used without increasing the outer diameter of the photoreceptor drum r.

Other image forming units such as the optical system V can be arranged with plenty of room.

(c) 1gJ'IJ1 point to be solved by the invention By the way, in the rotary moving type developing device k, since the rotary stage 7nl can rotate, the cover member x,
As clearly shown in FIG. 5, the position of the tip of x' facing the photoreceptor drum r had to be regulated and placed inside the rotational outer diameter of the rotary stage controller l. Therefore, the rotary moving type developing device includes a cover member x,
There is a gap between the tip of x' and the photoreceptor drum r! rY' is inevitably formed, and the photoreceptor drum r and the developing sleeve W
When the copying machine rotates, toner and toner carrier 'J7 are scattered from the gap Y+Y', and the inside of the copying apparatus is contaminated with the scattered toner.

(J) Means for solving the problem Miko Ming (C) The purpose of reducing the scattering of carrier, toner, etc. during development in the rotary type developing device is to reduce the scattering of carrier, toner, etc. during the development process in the rotary type developing device. A pair of movable dust-proof rail members are disposed so as to be able to move in and out of the rotating outer diameter of the rotating station so as to cover both sides of the opening of the developing sleeve in each of the developing units. The 1J dustproof rail member is retracted to the inside of the rotational outer diameter of the rotation station, and during development, the pair of movable dustproof rail members are advanced to the outside of the rotational outer diameter of the rotation station and approach the outer peripheral surface of the photoreceptor drum. The invention is characterized in that it is configured to be positioned by

By adopting the above-mentioned means, when the rotary station is rotated, the pair of movable dustproof seal members do not protrude or come into contact with the surface of the photoreceptor drum, and the rotary station can be moved to an appropriate location inside the rotary station. The developing device can be rotated to face the photoreceptor drum, and during development, a pair of movable dust-proof seal members approach the surface of the photoreceptor drum to minimize the gap between them, preventing toner from being copied during development. Splashing into the device is largely prevented.

(F) Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which a rotary moving type developing device a! A plurality of steel developing devices 3 are disposed in the rotary station 2 of f1, and a developing device N is provided in each developing device W3 in a direction facing the photoreceptor drum 5 during development.
3, and an opening 4 in the photoreceptor drum 5.
As seen from above, a developing sleeve 6 constituting a developing toner feeding rotary body is provided to rotate in the direction of the arrow, and yellow, magenta, cyan, and black colors stored in each developer M3 are Color toner 7 is transferred to the surface of photoreceptor drum 5. A cover member 9, 9' is provided on the front surface of each developing device 3.
are provided so as to cover both upper and lower sides of the opening portion 4 of the protruding developing sleeve 6, and these cover members 9,9
A rotatably movable dustproof knoll member 10, 10 is provided at the tip of the
' are arranged respectively. The movable dustproof seal members 10° and 10' (link members 11 and 11 respectively)
' A long hole 12 opened in the rotating station 2 through
12' is guided by the filter member 13. It is designed to be rotationally driven by '13'.

Since the first embodiment has the above-described configuration, when the rotating station 2 is rotated, the bin members 13 and 13' are simultaneously driven toward the outside of the long holes 12 and 12' by an appropriate drive mechanism. As a result, the movable dustproof seal member 10.
At the same time, the rotation station 10' is housed inside the outer diameter 2' of the rotary station 2, as shown by the dotted line in FIG. Therefore, when the rotating station 2 rotates, the movable dustproof seal member 10. The rotation station 2 is rotated smoothly without '10' colliding with or coming into contact with the surface of the photoreceptor drum 5. Also, during development, the bottle member 13.
13' are simultaneously driven inwardly into the elongated holes 12 and 12', so that the movable dustproof seal members 10 and 10' simultaneously have their tips aligned with the rotary stage 3, as shown by solid lines in FIG. 2 and is positioned close to the surface of the photoreceptor drum 5 to prevent the toner 7 from scattering during development.

Next, FIG. 2 shows a second embodiment of the present invention, in which a movable dust-proof Seal member 1
5.15' are arranged respectively. A rack gear 1 is provided at the rear end of the movable dustproof seal members 15, 15'.
6', 16' are provided, and the rack gear 16, 16' is disposed on the rotation station 2 side.
17', the movable dustproof rail member 15, Is' is driven forward and backward relative to the photosensitive drum 5.

The operation of the second embodiment can be easily inferred from the operation of the first embodiment, so the explanation thereof will be omitted below.

In addition, although the above embodiment has been described with respect to a color copying apparatus using a photosensitive drum, it can of course be applied to an apparatus having four Mf drums, and is not limited to a color copying apparatus, but can also be applied to a color recording apparatus. Of course. Furthermore, although a pair of movable dust-proof rail members are provided so as to cover both sides of the opening, it goes without saying that the present invention also includes a structure in which the movable dustproof rail members are provided only on one side of the opening, for example, on the lower side.

(G) As described in detail, according to the present invention, the rotationally movable developing device [1 or 1' of the color image forming apparatus is rotated to feed the developing toner in each developing device 3 disposed therein. A movable dust-proof sealing member 10, 10' or 15, 15' is attached to the rotating outer diameter 2' of the rotating station 2 so as to cover the opening part 4 of the body 6.
When the rotating station 2 rotates, the movable dustproof rail member 10, 10' or 15, 15' is retracted to the inner side of the rotating outer diameter 2' of the rotating station 2, and During development, the movable dust-proof seal member 10, 10' or 15, 15' is advanced to the outside of the U-shaped outer diameter 2' of the rotation station 2, approaches the outer peripheral surface of the image carrier (photoreceptor drum) 5, Since the movable dustproof seal member 10 is configured to be positioned, when the rotary stage 2 is rotated to selectively face the developing device 3 containing appropriate color toner in the image carrier 5, the movable dustproof seal member 10
．． The rotation station 2 is rotated smoothly without collision or contact of the image carrier 5 with the image bearing member 10', 15, or Is'. During development, the movable dustproof seal members 10, 10' or 15, 15' approach the surface of the image carrier 5, so that the gap in which the toner 7 is scattered is reduced as much as possible.
This effectively reduces the scattering of the toner 7 into the image forming apparatus, making it possible to maintain the inside of the apparatus clean.

[Brief explanation of drawings]

Claims (1)

[Claims] (1) Consisting of a plurality of developing units arranged radially within a rotation station located adjacent to the image carrier, each of which faces the image carrier through an opening during development. In a rotationally movable developing device having a developing toner feeding rotary body arranged as shown in FIG. When the rotating station rotates, the movable dust-proof seal member is retracted to the inner side of the rotating outer diameter of the rotating station, and
Rotational movement in a color image forming apparatus, characterized in that, during development, the movable dust-proof sealing member is advanced to the outside of the rotational outer diameter of the rotation station and positioned close to the outer peripheral surface of the image carrier. Mold developing device.