JPS6095567A - Developing device - Google Patents

Abstract

PURPOSE:To enable exact and direct measurement of the physical properties, for example, density of a developer without being affected by contamination, etc. by performing regulation of the thickness of a conveying layer by the magnetic force of the developer, recovery of the developer and measurement of the physical property value thereof. CONSTITUTION:A developer 4 is attracted and conveyed by magnets S3, N3, S4 in a magnet roller 6 and is suppied by a magnet N1 to a photosensitive drum 2. A member 7 for regulating layer thickness which regulates the layer thickness of the developer 4 conveyed by the roller 6 is provided forward in the conveying direction of the magnets S3, N3, S4. A recovering plate 8 which recovers the excess developer regulated by the member 7 is further provided and the physical property value of the developer 4 prior to use in development recovered by the plate 8 is detected by a density detector 9 having a detection surface disposed at about 30 deg. with said plate 8 and at 3-4mm. distance. The detection is accomplished by the constitution in which the magnetic permeability of the developer 4 is detected by a magnetic bridge system and the toner density is determined.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a developing surface used, for example, in an electronic one-shot printer.

[Technical background of the invention and problems in A]

For example, in electronic copying machines, Rayleigh-1 printers, etc., a developing device that visualizes the electrostatic 1a image formed by electric charge is used as shown in Fig. 1 and Fig. 4. Something like that is used. 1'<'C:l)'5. In these devices, the developer q is non-(d-th? 1st developing sleeve a).
What about the built-in magnet +-b? - 1 layer is attracted by the magnetic roller C, 12 layers +
The layer pressure is regulated to a predetermined level by Arl/J'') Feeling) I'
, 14. It is configured to be sent to the driver 110. In addition, in order to keep the image 1 constant, the image density is also Ll, It,! A mechanism for detecting the toner concentration in l'4 agent () is provided by liQ IJ et al.

This mechanism is shown in FIG. 1. In the '71 device, the 111-age agent (
1 Nopa (layer thickness regulating member) d J: [Tsu pain dawn, U
The developer that flows into the servo bobbin f (the change in the flow rate of J) is wound on the sensor bobbin f.

Detected by a small coil, thereby l-J-11i1
1 tut. It's Si1! X
In the device 11 shown in Fig. 12, a probe [
'/l If: S1 layer - Z' lobe It is configured to control the degree of henna. Furthermore, in the η apparatus shown in FIGS. 3 and 4, there is no developer in the developer Q container 1.
Instead of detecting the toner density of the photoreceptor drum e, the toner density is controlled by determining how much toner is applied to the non-image area of the photoreceptor drum e and detecting the degree of contamination thereof using the same method as the detection method using light described above. What is the configuration?

However, the apparatus shown in FIGS. 1 and 2 detects the degree of 1 to 1 in the developer q after development, and the device shown in FIGS.
In the apparatus shown in FIG. 4, it is possible to distinguish between whether the image density is caused by other factors that determine the image density or not.Furthermore, in light detection, dust particles with a 1-toner density move from the light emitting part over time.
There is a problem in that the light-receiving section becomes dirty and the density is detected higher than the actual density, making it impossible to accurately detect the density of 1 to 1 in the developer q.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and its purpose is to change the physical properties of the developer in the same state as that used for development, such as the density, which is directly influenced by external factors such as dirt. It is an object of the present invention to provide a developing device that enables accurate measurement without any problems.

[Summary of the invention]

The present invention achieves the above objects.
,-,,11i! The image agent is absorbed by the magnetic force of the transport pole and
The IIN is fed and supplied to the area to be developed using the magnetic force of the Itil pole. l'Jl 'JrufJt
Feeding means and conveyance of this feeding means +4i, J: Rita i'A
J:1Mt3″t,
Layer thickness control means for regulating the layer thickness of the developer [9, l
: ii! It is arranged with a slight inclination from the position close to the conveying pole of the feeding means to the position away from it, and the mixture 1ψ is regulated by the current control means and the surplus etc./, 1 before the current use is Collection means for collecting developer and this time I
ll/EJ"r (1111th point 1111th - or 11th upstream from the upstream side of the flow of the developer and arranged so that the gap is narrowed. The device is characterized in that it is equipped with a detector r9 for detecting the physical property values of the 1lij film before use for development.

[Embodiments of the invention]

Hereinafter, an example of the present invention will be explained with reference to FIGS. 5 to 10. To Figure 415 In Figure 11, 1 (
, 1 (feeling like the opening part rotates in a predetermined direction)Y,
The container 1 has a developer 4 made of toner and a carrier, and an agitator 5 as a conveying means for conveying and stirring the developer 4. , a magnetic roller 6 serving as a supplying means for conveying the developer 4 conveyed and stirred by the agitator 5 and supplying 1 to 3 of the developer 4 to the photosensitive drum 2 through the opening 3; A layer thickness regulating member 7 that regulates the layer thickness of the developer 4 conveyed to the magnetic roller 6, and a collection for returning surplus developer 4 regulated by the layer thickness regulating member 7 to the agitator 5. A plate 8, a temperature detector 9 for detecting the concentration of the developer 4, and the like are housed.

A bottom lid 11 is disposed at the bottom of the container 1 and forms a first duct l-10 for sucking the developer 4 scattered from inside the container 1 to the outside. Mouth 1
2 faces the photosensitive drum 2 below the developing area. Further, an upper lid 13 is disposed at the −F portion of the container 1 to prevent the developer 4 from scattering from the magnetic roller 6.
This is detachably attached to the side plates 14, 15 of the container 1. Also, on the top of this top lid 1h, there is a fly 11 (shitagen ((
A second duct 16 for suctioning the agent 4 is formed between the cover 17 and the suction port 18 of the second duct 16 (J) is connected to the magnet 17. Also, these first and second ducts t
In order to equalize the suction efficiency in the axial direction +71, there is a screen wall 10 that sequentially narrows the gap between the fan and the reno' side l\tact in order to equalize the suction efficiency in the axial direction. ,
In addition, inside the side plates 171 and 15 of the container 1, there are arranged blocks 20 and 21 facing each other, and inside the block 20 on the side of 1 dynodo 1
A third duct 1-22 communicating with η is formed.
゜And this third duct 22 and 1 wire! l: a
13 second duct] ~ 16 is the RQ on the rear side of container 1.
1. They are joined by a fourth duct 23, which is connected to a suction device (not shown) via this fourth duct 23.

The magnet roller 6tJ2, the cylindrical current IK+sleeve 24, and the magnet 25 or I3 provided within the current sleeve 24 are rotatably held by the side plates 14 and 15 of the container'1.

The agitator 5 is connected to the photosensitive drum 2 of the magnet roller 6.
It is held by side plates 14 and 15 on the opposite side, and has two double spirals arranged coaxially with different winding directions, and partitioned by a cylindrical sleeve 26 to form an integral structure.

Further, a first gear 2 is attached to the shaft 27 of the developing sleeve 24.
8, second gears 30 are respectively attached to the shaft 29 of the stirrer 5, and these are connected and meshed via a third gear 31. The second gear 30 is a coupling gear, and is provided with an engaging protrusion 32.

The layer thickness regulating member 7 is approximately 30 mm thicker than the magnetic roller 6.
It is placed at the top. And block 2 on both sides
0.21, and by moving it horizontally, the layer thickness of the magnetic brush formed on the developing sleeve 24 can be regulated.

The collection plate 8 is arranged below the layer thickness regulating member 7, and similarly to the layer thickness regulating member 7, it is supported by blocks 20, 21 on both sides.

The concentration detector 9I, 1 is arranged on the side of the collection plate 8,
In contact with the developer 4, 1) detects the read-r-H value, for example, using a magnetic bridge method, 1) detects the magnetic permeability of the developer 4, and sets 1-J-INIf. It has become.

In addition, on the upper lid 13, there are present
There is a curvature with a slight gap along the developing screen 2/1 at the top of the non-image area at both ends! , = a convex portion 33 is provided, and the developer 4 is applied to the developing sleeve 24 and the side plate 14 of the container 1.
．． 11-Ruru J is turned into a sea urchin to prevent it from getting between it and 15. Further, flange portions 34 and 35 are provided at the portions of the 11'l screws 20° 21 on both sides facing the developing sleeve 2/'l, thereby connecting the developing sleeve 24 and the side plates 14 and 15. The gap is set to about 0.2-0.4 mm to prevent the developer 4 from entering. Note that the photosensitive drum 2 is located at the tip of the cover 17.
A J cowl 36 is provided in contact with the photosensitive drum 2 and the cover 17 to prevent the developer 4 from scattering above the container 1 11-19-.

Next, to explain the above-mentioned stirrer 5, 37 in Fig. 9 is the first spiral, which has an inner diameter of 8 mm and an outer diameter of 25 mm.
It is a piece of cloth wrapped with two spiral spirals with a lead length of 20 to 40 mm at the front and back, wound around the shaft 29.

Further, a second spiral 38 is coaxially provided on the outer periphery of the cylindrical sleeve 26 and has an outer diameter 32 to
It is wound with a left-handed double spiral with a length of 34 mm and a lead of 250 to 350 mm, and is fixed to the first spiral 37 so that it can rotate together with it. Furthermore, the cylindrical sleeve 26 is provided with several first developer discharge holes 39 at the center of the opening of the first spiral 38 at a position 12 to 13 mm rotationally rearward of the second spiral 38, and a plurality of first developer discharge holes 39 are formed on the rear side. A second developer discharge hole 40 is opened from the root of the second spiral 38 to 90 degrees backward in rotation.

Furthermore, first and second disks 41 and 42 are provided at both ends of the first spiral 37 to stop the flow in the axial direction on the wood image side 4, and the shaft 10 at both ends is The developer 4 is prevented from entering the portions 43 and 44. Further, a cylindrical sleeve 20 and a second (7) spiral 38 are provided along the lead length of the first spiral 37 from the 1-12 disc 42 on the front side to the rear side. First, the first spiral 37 is exposed. A toner replenishing port 45 is located above the exposed portion of the first spiral 37, and a toner receiving port 45 is provided below (also a toner receptacle with a curvature that fits around the outer diameter of the first spiral 39 and has a slight gap). 46 are arranged iQ.

When the agitator 5 rotates in the direction shown in the figure and the 1-toner is fed from the toner supply port 45 to 11 (11), the developer 4 at the bottom of the 1-toner supply port 45 mixes with the 1-toner. The developer 4, which has entered the cylindrical sleeve 26, continues to be stirred until C81j and moves to the rear side. During the process, the developer 4, which has been stirred to some extent, comes out of the cylindrical sleeve 2 () little by little from the 1.1-1 hole 39. By the time the developer reaches the second 1M outlet hole 401i on the rear side, the developer 4 replenished with toner is present over the entire axial direction of the outer circumference of the cylindrical sleeve 26 of the agitator 5. Furthermore, the developer 4 coming out of the cylindrical sleeve 26 is scraped up into the developing sleeve 24 by the second spiral 38 and moves from the rear side to the front side.

Then, the toner finally reaches the toner supply port 45 again and repeats the above cycle. That is, the flow of the developer 4 is clear, such that the developer 4 whose density has become higher due to toner replenishment is sufficiently stirred before being used for development, and the developer 4 whose density has become lower is replenished with toner. This allows stable image density to be obtained at all times.

Next, to explain the magnet roller 6, as shown in FIGS. 7 and 10, its magnet 25
These include three transport poles 83°N3.84 for forming and transporting a magnetic brush on the developing sleeve 24, and one main pole facing the photosensitive drum 2 for holding the magnetic brush and performing development. N1 and three collection plates 81 for collecting the magnetic brush after development. 7 poles with N2.82 (
14 have been completed.

Each magnetic pole is connected to the first transport pole S3'/Ith) third time Ill
? The poles are different from each other up to the pole S2.
Only the third transport pole S3 and the third transport pole S2 are the same pole, and the position of the weak magnetic force created between them is between the center of the magnet roller 6 and the center of the stirrer 1'1-5. It is arranged so that it is near the connecting line. As a result, from the first transport pole S3 to the 33rd collection plate S2, the developing sleeve 2
After the third collection 44i S 21, the developer 4 that is absorbed by the surface of the developing sleeve 4 and transported reliably is affected by the reduction of the binding force due to the magnetic force, the centrifugal force due to the rotation of the developing sleeve, and the action of gravity. It is pulled away from the surface of the developing sleeve 24,
It will be blown towards the agitator 5. This developer 41
;1. As the second spiral 38 of the agitator 5 rotates, the resulting flow of developer 4 is sent to the agitator 5 and mixed with the developer 4 mixed with toner again! It will be combined. In other words, the developer 4, once spent, is used for development 13- after being refreshed. Further, since the lower frame 47 between the developing sleeve 24 and the agitator 5 is inclined with respect to the angle of repose of the developer 4, the developer 4 is less likely to sink to the bottom.

Further, in the first transport pole S3, a wide magnetic material is arranged near the inside of the developing sleeve 24.
The area near the peak value of the magnetic flux density on the surface covers the height from the top of the stirrer 5 to the tip of the collection plate 8. Therefore, the developer 4 is transferred from the top of the stirrer 5 to the collection plate 8.
It is attracted over the entire upper area of the developing sleeve 24 up to the tip,
A sufficient amount of developer is maintained according to the structure of the magnetic brush, and there is no shortage of developer supply. Further, the height of the region near the magnetic flux density peak value of the first transport pole S3 is
Since the magnetic flux density rapidly decreases above the height of the tip of the layer pressure regulating member 7, the surplus developer 4 is weakly restrained by the magnetic force, and the collection plate 8
It becomes easier to flow over the top.

Further, the collection plate 8 is located at an angle of 11° so that its tip is approximately the same distance from the developing sleeve 24 and the distance from the lower surface of the layer 14-thickness regulating member 7 that constitutes the passage for the developer 4. Angle of repose J of developer 4: Slightly loose texture C
It is stored. Therefore, according to layer thickness regulation department +47)
The excess developer 4 passes through the passage V8 with a constant gap, causing Ci' at the bottom of the layer thickness regulating member 7,
It is not easily compressed, flows smoothly, and has a safe I^j angle J-
Although the flow is restricted to some extent by the slight slope, the flow is uniform. , 1, I, the layer thickness regulating member 7 has a wedge-shaped tip.
The developer 4 adsorbed on the current 110 three 12/l is scooped out to reduce the layer thickness. It is now regulated. This lJ, ON f image side 4
The stress applied to the developer 1 is reduced, the rotational torque is reduced, and the developer 1 becomes more efficient.

In addition, on the collection plate 8, there is a collection part 4 whose +11 slope is as loose as i%.
8 is installed, and above the concentration detector is a magnetic bridge type concentration detector having a flat probe surface 49 that is inclined at an angle of about 30 degrees with respect to the collecting section 48 and has a gap of 3 to 4 mm between the closest parts. 9 has been installed. And this collection section 4
The developer 4 is configured to flow between the probe surface 49 and the probe surface 49 . Furthermore, a rectifying magnet 50 with a magnetic pole SO of the same polarity as the first transport pole S3 facing downward is installed at the top of the tip of the collecting section 48. The lines of magnetic force generated by this are arranged to be approximately parallel to the upper surface of the collecting section 48. As a result, the recovery section 48
The developer 4 between the probe surface 49 and the probe surface 49 has a stable, steady flow with little stagnation or surface collapse, and the output for concentration detection is stabilized. Note that if the distance between the collecting section 48 and the probe surface 49 is too narrow, the flow will begin to stagnate and the toner will not respond sensitively even when replenishing the toner.On the other hand, if it is too wide, the detection output will increase due to fluctuations in the layer pressure of the flow. It will fluctuate, making it impossible to obtain stable output.

Further, the length of the first transport pole S3 is the same as the maximum width of the sheet on which the image is to be copied, and the other magnetic poles are longer than this. For this reason, the layer thickness regulating portion +
A 7 J: The magnetic force acts to spread the developer 4 to both sides, making the layer thickness of the developer 4 uniform near both ends, and causing the developer 4 to come into contact with the photoreceptor drum 2 too much at both ends. m
Developing can be carried out without the image being blurred. Jj
All of the poles except the first transport pole S3 have an image width of J: 2. Therefore, the area where the layer thickness of the developer 4 is reduced due to the decrease in the force at both ends of the magnetic pole is the image width of J: Since the edges are placed on the outside, developing defects may occur at both ends. B1: Since the developer 4 is effectively used at both ends of the magnetic pole and no surplus developer 4 is generated, the blocks 20 are installed near both ends of the magnetic pole.
．． The present fill All /I that passes over the flange portions 34.35 of 21 and enters the gap between both ends of the developing sleeve 24 and the side plates 14.15 of the container 1 is almost eliminated. Furthermore, the inside of both sides of the developing sleeve 24 is provided with one side from both ends of the magnetic pole.
A magnetic disk 51, 52 having a slightly smaller outer diameter J of the developing sleeve 24 is placed approximately 5 mm outside.
17- to reduce the magnetic flux density leaking outward from both ends of the 1M image sleeve 24. Therefore, the developer 4 is no longer drawn into the gap between both ends of the developing sleeve 24 and the side plates 14 and 15 of the container 1, and even if there is developer 4 that enters, it is not allowed to adhere to both sides of the developing sleeve 24. However, the developing sleeve 24 rarely rotates, and the developer 4' does not scatter from both ends of the developing sleeve 24.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a supply means for attracting and conveying the developer by the magnetic force of the conveyance pole, and supplying the developer to the area to be developed by the magnetic force of the development pole to develop it, and a conveyance of the supply means. a layer thickness regulating means provided in front of the pole in the transport direction and regulating the layer thickness of the developer transported by the supply means; and a layer thickness regulating means arranged with a gentle slope from a position close to the transport pole of the supply means to a position away from the transport pole. , a collecting means for collecting surplus unused developer regulated by the layer pressure regulating means, and a collecting means opposite to the collecting means and having a gap narrowing from the upstream side to the downstream side of the flow of the developer. Since it has a detection surface arranged and a detection means for detecting the physical property value of the developing agent before use for development recovered by the recovery means 18-, the condition is the same as that used in the present 1ψ. (12) The physical properties of the image agent, such as density, can be measured directly and accurately without being influenced by external factors such as dirt.

[Brief explanation of drawings]

Figures 1 to 4 each show different quantities of 4g and rice. The explanatory drawings, FIGS. 5 to 10, show one embodiment of the present invention, in which FIG. 5 is a perspective view, FIG. 6 is a cross-sectional view, and FIG.
The figures are a vertical side view, FIG. 8 is a perspective view showing the block on the beam j' side, FIG. 9 is a side view of the stirrer, and FIG. 10 is a side view with a portion of the magnet roller sectioned away. 2... Developed area (photosensitive drum), 4... 1m developer, 6... Supply means (magnetic roller), 7...
Layer thickness regulating member, 8... recovery plate, 9... concentration detector,
49...Detection surface (probe surface), 50...For rectification 1
ifl? 'i. Applicant's representative Patent attorney Takehiko Suzue 19- Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 4- Figure 6 32 Figure 7 Figure 8 Figure 9

Claims (4)

[Claims] (1) The developer is adsorbed by the lJl force of the transport pole and 11
1 feed, the magnetic force of the developing pole is J: (・) 'Nlt 112
a supply means for supplying 11 (11) to the Fj+ portion and developing it;
This 11 (layer J'J regulating means is installed in front of the conveying pole of the T-stage in the conveying direction and regulates the layer thickness of the developer conveyed by the supply element "Q", and A gentle inclination is placed at a position in the gap from the 11°L image close to the conveying pole of the supply means, and is regulated by the L recording thickness regulating means.
t-C Surplus [I.] Collect the unused developer. It has a detection surface disposed in the direction of 1' which is collected by the collecting means.
1. A developing device comprising a detection means for detecting the physical properties of a developer before use. (2) The developing device according to claim 1, characterized in that the detection means is constructed of an IC magnet KQ I-J- (KQ I-J-) with a surface of the same polarity as the transport pole of the supply means facing the collection means. . (3) Retrieval hand ``Q detector 1'0 (small bleeding 411
The angle is about 301, cholera (7) Rir IIi rank Il &
The developing device according to claim 1, characterized in that (.71 distance 1 hll G-3-, -/1 mm). (4) The detection means detects the magnetic permeability of the developer using a magnetic film circuit. !
! 1. The developing device according to claim 1.