JPS58220157A - Method for stirring 2-component type developer in developing machine - Google Patents

Abstract

PURPOSE:To prevent nonuniformization of toner density, by receiving an excess of developer after development once into one place exterior to the case of a developing machine, and then introducing again into the case. CONSTITUTION:An excess of developer after development is conveyed with an ejective screw conveyer 12 to a storage case 14, and temporarily stored there. Then, it is again conveyed with a feed screw conveyer 13 into the case 11 of the developing machine, while the carrier and the toner of the developer are uniformly mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of stirring a two-component developer pumped into a developing machine of a copying machine.

FIG. 1 conceptually shows a developing device in a conventional copying machine. In this developing machine, developer 2 in a developing machine case 1 is conveyed along a developing sleeve 4 disposed around a magnet 1 call 3 to a photoreceptor 5, and development is performed there. The developer 2a remaining after the image falls along the bottom 1a of the developer case 1 to the bud IL5, is mixed with the newly supplied toner 7 by the paddle 1!1', and is transferred to the magnet roll 3 again. J, the control sleeve 41 is conveyed to the photoreceptor 5.

In FIG. 1, 8 is a toner supply roll, and 9 is a toner supply roll.
is a wobble that promotes agitation of the developer in the depth direction (axial direction) of the developing machine, and is disposed coaxially with the paddle 6.

In such a developing machine, especially microtoning developer (
When using a developer with an average particle size of 5 to 50μ for Gearia and 3 to 40μ for 1-No-, the fluidity of the developer is poor, so oh()
The developer is not stirred sufficiently. Therefore, in conventional developing machines (F), when a large amount of 1-toner is consumed in a certain area, the amount of toner in the developer decreases in that area, resulting in a local density decrease and whitening on copy paper -F. If omission occurs and the 1-toner that has fallen through the toner replenishment roll 8 is not sufficiently mixed with the carrier and the developer is conveyed to the photoreceptor 5, the 1-toner will not be present on the copy paper. Even if there is a partial drop, a blackhead (high back) will occur.

Such a river edge can be considerably improved by arranging the wobble 9 on a separate axis from the paddle 6, but this increases the size of the ms machine and also increases the cost.

In view of these problems, the first object of the present invention is to be able to uniformly mix the carrier of the MS agent and the toner, to realize a compact and inexpensive mixing device, and to make it possible to easily replace the developer. An object of the present invention is to provide a method for stirring a two-component developer in a developing machine, which makes it possible to easily perform the following steps.

In order to achieve such an object, in the present invention, the remaining developer after development is temporarily stored in one place outside the developer case, and
The toner is supplied again into the developing chamber A, thereby preventing non-uniform toner concentration.

The present invention will now be described with reference to embodiments shown in the drawings. FIGS. 2 and 3 conceptually show an apparatus for implementing the developer stirring method according to the present invention. This device has a carrier discharging screen in the developing machine case 11.
Second conveyor 12 and developer supply screw conveyor 13
In addition, a storage case 14 is arranged outside the developing machine case 11, and both screw conveyors 12 and 13 are connected to each other via the storage case 14.

Both screw conveyors 12.13 are magnets 1 to +11
TL-12a and TL-13a are located on the opposite side of the photoreceptor 16 with respect to the magnet 1-[1-
It is arranged parallel to the axis 15a of the lever 15. The screw conveyor 12 for discharging developer includes Macscrews 1 to 11-15.
A developer intake port 12c is formed in the side peripheral wall of the conveyor case 12b. Further, the developer supplying screw conveyor 13 is positioned above the developing sleeve 17, and a developer discharge port 13c is formed in the lower peripheral wall of the conveyor case 13h. The developer IJI output screw conveyor 12 shown in FIG. I want to communicate. Furthermore, in the apparatus of this embodiment, a toner replenishing device equipped with a toner replenishing roll 19 is installed at the bottom of the storage case 14, and a cleaning device ( Collection from f)]・j
One end of the conveying device 20 that conveys - is connected. The screw conveyor 12, 13, gutter replenishment device N63, and recovered toner conveyance device are all detachably connected to the storage case 14. In addition, in Figure 2 -(,2
1 and 22 are scrapers.

In such a copying machine, the remaining developer after development is carried out on the photoreceptor 16 is scraped off from the developing sleeve 17 by the scraper 21, and moves along the lower surface of the scraper 21 in the direction of the arrow. The developer falls from the end of the scraper 21 to the intake port 12C (=I) of the discharge screw conveyor 12. It is transported into the storage case 14 by the screw 128 and the screw 18a of the auxiliary screw conveyor 18.

The developer transported to the storage case 14 in this way is
A cleaning device (not shown), a cleaning device (not shown), etc. are added to the collection 1 to ner conveyed by the conveying device 20 and a new gutter to be replenished via the replenishment roll 19 as necessary.
Screw 13 of supply screw conveyor '13 again
a into the 3M II machine case 11, and is dropped from the discharge port 13C onto the developing sleeve 17-L. The developer falling onto the developing sleeve 17 is conveyed again to the photoreceptor 16 by the magnet 1-0-15, where it is subjected to the ryA* action.

In this way, the remaining developer after development is conveyed to the storage case 1/1 by the discharge screw conveyor 12, stored in the storage case 14, and is conveyed again by the supply screw conveyor 13. The carrier is supplied into the developing machine case 11, during which the carrier and the toners 1 to 1 are uniformly mixed. In addition, when replenishing the developer from inside the developer case 11, remove the storage case 14 from the slurry 1-conveyor 12.13, the conveyance device 20, and the toner replenishment device, stop the toner replenishment device, and remove the developer from the screw conveyor. 12, 13 and the transport device 20, the developer can be collected at the location where the storage case 14 has been removed.

As described above, in the method of stirring the two-component developer in the developing machine according to the present invention, the remaining developer after development is temporarily stored in the storage cooler installed outside the developing machine case, and then it is developed again. 1 supplied in the machine case! Therefore, there is no unevenness in the amount of toner that falls in the depth direction inside the developing machine nozzle, and the developer can be easily replaced. Instead, install a developer discharge and supply device such as a screw conveyor (
), thus making it possible to downsize the developing machine.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view conceptually showing a developing machine in a conventional copying machine; FIG. 2 is a vertical cross-sectional view conceptually showing a developing machine for carrying out the method according to the present invention; FIG. 3 is a vertical cross-sectional view conceptually showing the main parts thereof. 11... Current@machine source, 12... Screw conveyor for developer discharge, 12a... Screw, 12b.
...Conveyor case, 12C...Intake port, 13...
Developer supply screw conveyor, 13a...Screw, 1ζ3b...Conveyor case, 13C...Discharge port, 14...Storage case, 15...Magnet roll, 16...Photoreceptor, 17.・Developing sleeve, 1
8... Auxiliary screw conveyor, 19... Toner supply L1-ru, 20... Conveying device, 21.22... Scraper.

Claims (1)

[Claims] The storage container is arranged independently of the developing machine case, and the remaining developer after visual imaging is temporarily stored in the storage case, and then it is again supplied into the current IsI machine case. A method of stirring the two-component developer inside the developing machine.