JPH04125577A - Development device - Google Patents

Abstract

PURPOSE:To improve the conveyance speed and agitating performance of a developer by providing ribs for agitation to the outer peripheral parts of two linear spiral blade bodies provided to the rotary shaft of a conveyance member, making the tilt angle of the blade bodies small, and crossing the top and reverse blades at outer peripheral edge parts. CONSTITUTION:The rotary shaft 74 is provided with the two spiral blade bodies 75 and 76 formed by joining the top and reverse semi-elliptic blades 75a... integrally and the ribs 77... for agitation are fitted the outer peripheral parts. Toner and carriers are conveyed by the rotation of the rotary shaft 74 of a conveyance member 73 while agitated by the blade bodies 75 and 76, and thus supplied to a developing roller. Consequently, the conveying speed of the developer is improved and the agitating ability is held excellent. Further, the developer is agitated with the ribs 77... of the spiral blade bodies 75 and 76, so the developer can be agitated excellently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Field of Industrial Application) The present invention relates to a developing device provided in, for example, an electronic copying machine.

(Prior Art) As shown in FIG. 7, for example, this type of developing device includes a developing container 101 in which a developer consisting of toner and carrier is stored, and a developing roller 102. There is.

Further, a toner replenishment port 103 is provided at one end of the developer container 101, and a conveying member 104 is provided in the developer container 101 to agitate and transport the toner supplied from the toner replenishment port 103 to the other end. is provided.

As shown in FIGS. 8 and 9, the conveyance member 104 is composed of a rotating shaft 105 and a spiral blade body 106 attached to the rotating shaft 105.

During development, the developer is supplied to the electrostatic latent image on the photoreceptor by the rotation of the developing roller 2, and the image is developed.

When the developer in the developer container 101 is consumed by this development, toner is replenished from the toner supply port 103.

The replenished toner is conveyed while being agitated by the rotation of the blade body 106 and sent to the developing roller 102 .

(Problem to be Solved by the Invention) However, in the past, since there is only one thread of the spiral blade 106, when the pitch of the blade 106 is increased, the developer conveyance speed increases, but the stirring performance decreases. do.

Conversely, if the pitch of the blades 106 is reduced, there is a problem in that the developer agitation performance increases or the conveyance speed decreases.

Further, if the inclination angle θ of the blade body 106 is large, the conveyance speed decreases.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a developing device that can obtain good developer conveyance speed and agitation performance.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a system in which the developer replenished in the developer container is agitated and transported by a conveying member and sent to the developing roller. In a developing device that supplies developer to a developing area using a roller for development, the conveying member includes a rotating shaft, two blades provided in a spiral shape on the rotating shaft to agitate and convey the developer, and the conveying member. It consists of a stirring rib provided on the outer periphery of two blades, and the conveying member has a rotating shaft, and semi-elliptical blades are mounted on the rotating shaft at equal pitches on the front and back sides and tilted at a certain angle. By making the inclination angle of the blade body smaller than the blade angle of the spiral blade body, which is formed by joining semi-elliptical blades on the front and back sides, the front and back blades are arranged in a spiral shape. They are crossed at the ends.

(Function) By providing two spiral blades and providing stirring ribs on the outer periphery of these two blades, the inclination angle of the blades is made small, and the front and back blades are placed at their outer periphery ends. By intersecting at the portion, the developer conveyance speed and agitation performance are improved.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 to 4.

Figure 4 shows the internal configuration of the entire device.
Inside are charging 2 exposure, development, transfer, peeling, cleaning, static elimination,
Image forming process configuration means 2 such as fixing is built-in, and the top surface of the main body 1 includes an original placing table (on which originals are placed).
Hereinafter, a platen glass (hereinafter referred to as a platen glass) 3 is provided.

Further, on one side of the apparatus main body 1, a paper feed cassette 10 and a manual paper feed tray 10a are inserted, which serve as a paper feed unit that stores sheets such as plain paper to be fed to the image forming process configuration means 2. A tray 12 is provided on the other side of the apparatus main body 1 to collect sheets on which images have been fixed.

The image forming process configuration means 2 has the following configuration. That is, a drum-shaped photoreceptor 20 as an image carrier is arranged approximately in the center of the apparatus main body 1, and a charging device 21, a charging device 21, Exposure section 22a of exposure section (optical system) 22
1 developing device 23, transfer charger 25. Peeling charger 26, cleaning device 27. Static eliminators 28 and the like are sequentially arranged.

Furthermore, the paper feed cassette 10 is provided in the apparatus main body 1.
A paper transport path 31 that guides the paper automatically fed from the photoreceptor 20 and the transfer charger 25 to the tray 12 provided on the left side of the apparatus main body 1 via the image transfer section 30.
is formed.

Pairs of registration rollers 3 and 2 are arranged on the upstream side of the image transfer section 30 of this paper transport path 31, and a fixing device 33 consisting of a heat roller 33a and a press roller 33b and a pair of paper ejection rollers 34 are arranged on the downstream side. has been done. Also,
Between the peeling charger 26 and the fixing device 33,
A conveyor belt 35 is provided.

Further, in the vicinity of the installed portion of the paper feed cassette 10, a pickup roller 36 that takes out sheets one by one and a conveyance roller that receives the sheets taken out via the pickup roller 36 and sends them to the sheet conveyance path 31. Separation and conveyance means 37 consisting of a separation roller and a separation roller is provided.

Further, a gate 61 is provided between the fixing device 33 and the paper ejection roller 34, and when this gate 61 is rotated upward, the paper is sent to the conveyance path 62 for double-sided copying below, and 61 rotates downward, the paper is delivered to the paper ejection roller 3.
4 and is discharged.

A plurality of pairs of feed rollers 63 are arranged on the conveyance path 62 at predetermined intervals. These feed rollers 63
. . , the paper is fed into the stack section 64. A take-out roller 65 is provided in the stack section 64, and the take-out roller 65 takes out the sheets one by one.

The picked paper is sent to the introduction side of the registration rollers 32 via a supply path 66.

Further, the exposure device 22 illuminates the document set on the platen glass 3 with an exposure lamp 41 as a light source surrounded by a reflector 40, and directs the reflected light from the document to a first reflection mirror 42, a second reflection mirror 42, and a second reflection mirror 42. It is guided to the lens 45 via the reflective mirror 43 and the third reflective mirror 44 in order, and then,
The light transmitted through the lens 45 is guided to the photoreceptor 20 through a fourth reflective mirror 46, a fifth reflective mirror 47, a sixth reflective mirror 48, and a slit glass 49 in this order.

The exposure lamp 41 and the first reflection mirror 42 surrounded by the reflector 40 are mounted on a first carriage (not shown) that is movable back and forth along the lower surface of the platen glass 3, and Mirror 43 and third
The reflective mirror 44 of the second carriage (not shown) moves in the same direction at half the speed of the first carriage.
The first and second carriages move from left to right in the state shown in FIG. 1 using the carriage shaft as a guide, thereby applying light to the original set on the platen glass 3. is scanned to expose an image corresponding to the original onto the photoreceptor 20 by slit exposure.

Note that a document conveying device 51 is provided on the platen glass 3.

This document conveyance device 51 includes a plurality of conveyance rollers 52...
, and a conveyor belt 53 that extends between these conveyor rollers 52 .

Therefore, when copying, first, the document feeder 5
1, the original is conveyed and set on the platen glass 3, and then a copy button (not shown) is turned on. As a result, the exposure lamp 41 is turned on and the first and second carriages are moved along the platen glass 3. By this movement, the original is scanned with light, and the light reflected via the original is reflected by the first to third reflecting mirrors 42, 43, 4.
4 to the lens 45, and furthermore, this lens 4
5 to the fourth to sixth reflecting mirrors 46°47.4
The image is formed on the photoreceptor 20 via the photoreceptor 8 .

The surface of the photoreceptor 20 is charged by a charging device 21, and an electrostatic latent image of the document is formed by this image formation. This electrostatic latent image is developed by being supplied with developer by the developing device 23.

On the other hand, at this time, the paper is taken out from the paper feed cassette 10 by the pickup 36, separated one by one by the separating and conveying means 37, and sent to the registration rollers 32.

After this paper is aligned by the registration rollers 32, the image transfer section 3 between the photoreceptor 20 and the transfer charger 25
0, and the developer image on the photoreceptor 20 is transferred.

The paper to which this image has been transferred is peeled off from the photoreceptor 20 by the action of the peeling charger 26, and is conveyed by the conveyor belt 35. The paper is then sent to the fixing device 33 to have the image fixed thereon, and is normally ejected to the ejection tray 12 via the gate 61 and ejection roller 34.

In addition, during double-sided copying, the gate 61 rotates upward and the paper is sent to the conveyance path 62, conveyed by the conveyance rollers 63, and stacked in the stacking section 64. Then, the paper is taken out by the take-out roller 65 and sent through the supply path 66 in an inverted state to the registration rollers 32, where it is aligned and then sent to the image transfer section 30 where the image is transferred. Ru.

The paper onto which this image has been transferred is sent to a fixing device 33 via a conveyance belt 31, where it is fixed and then ejected via an ejection roller 34.

Next, the developing device 23 will be explained.

The developing device 23 stores a two-component developer consisting of toner and carrier in its developing container 71, and is also provided with a developing roller 72 rotatably located close to and facing the photoreceptor 20.

Further, within the developer container 71, a conveying member 73 is rotatably provided.

The conveyance member 73 is constructed as shown in FIG.

That is, 74 in the figure is a rotating shaft, and as shown in FIGS. 2 and 3, this rotating shaft 74 has semi-elliptical blades 75a... or two spiral-shaped blades 75a, which are joined together on the front and back. A blade body 7576 is constructed.

A stirring rib 77 is attached to the outer periphery of these two blades 75, 76.

During development, the developing roller rotates 720 times.
A developer is supplied to the electrostatic latent image formed on the photoreceptor 20 and developed.

When the developer is consumed by this development, the developer container 71
Toner is replenished inside.

This replenished toner is transferred to the rotating shaft 7 of the conveying member 73.
4, the two-striped spiral blade body 7 rotates.
5.76, the toner and carrier are conveyed while being stirred and supplied to the developing roller 73.

As described above, since the toner and carrier are agitated and conveyed by the two-thread spiral blade body 7576, the developer conveyance speed can be improved and the agitation ability can also be maintained satisfactorily.

Further, at this time, since the developer is stirred by the ribs 77 of the spiral blade 7576, the developer can be stirred even better.

Note that the present invention may be as shown in FIGS. 5 and 6.

That is, 81 in the figure is a rotating shaft, and on this rotating shaft 81 semi-elliptical blades 82 are arranged on the front and back at equal pitches and tilted at a certain angle to form a spiral blade body 83. As shown in FIG. 8, by making the inclination angle θ' of the blade body 83 smaller than the blade angle θ of the spliced spiral blades, the front and back blades 82...
・The outer circumferential edge of the line should not be joined but intersect.

The developer is agitated and conveyed by the rotation of the spiral blade body 83, but since the blade angle θ' of the spiral blade body 83 is made small, the conveyance speed can be improved, and the blade 83 By intersecting the outer peripheral ends of the developer, the agitation performance of the developer can also be improved.

[Effects of the Invention] As explained above, according to the present invention, two spiral blades are provided, and stirring ribs are provided on the outer periphery of these two blades, or Since the inclination angle of the blade body is made small enough to make the blade angle of the spiral blade joined on the front and back sides, and the outer circumferential ends of the front and back blades are shaped to intersect, it is effective in improving the developer conveyance speed and stirring ability. .

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram showing a developer conveying member, FIG. 2 is a front view showing one end of the conveying member, and FIG. 3 is a front view showing the other end of the conveying member, FIG. 4 is an internal configuration diagram showing the electronic copying machine, FIG. 5 is a schematic configuration diagram showing another developer conveying member, and FIG. Front view showing one end side, Figures 7 to 9
The figures show a conventional example; FIG. 7 is a perspective view of the developing device, FIG. 8 is a configuration diagram showing the developer conveying member, and FIG.
The figure is a front view showing one end thereof. 20... Photoreceptor (portion to be developed), 71... Developer container,
73... Conveying member, 72... Developing roller, 74.8
1 revolution shaft, 75, 76.83... blade body, 75
a, 82...feather.

Claims (2)

[Claims] (1) In a developing device in which the developer replenished in the developer container is agitated and conveyed by a conveying member and sent to a developing roller, and this developing roller supplies the developer to the area to be developed for development, the conveying member rotates. A shaft, a two-striped blade body provided in a spiral shape on the rotary shaft to agitate and convey the developer, and a stirring rib provided on the outer periphery of the two-striped blade body. A developing device characterized by: (2) In a developing device in which the developer replenished in the developer container is agitated and conveyed by a conveying member and sent to a developing roller, and the developing roller supplies the developer to the area to be developed for development, the conveying member rotates. It consists of a shaft, and a blade body formed by arranging semi-elliptical blades on the rotating shaft at equal pitches on the front and back sides and tilted at a certain angle in a spiral shape, and the inclination angle of the blade body is adjusted so that the semi-elliptical blades A developing device characterized in that the front and back blades intersect at their outer circumferential ends by making the blade angle smaller than the blade angle of the spiral blade body which is joined between the front and back sides.