JPH05107908A - One-component developing device - Google Patents

Abstract

PURPOSE:To prevent developer whose electrostatically charged amount is low from being deviated and accumulated in a device and to form an excellent image without the lowering of density over a long term in a one-component developing device in which powder one-component developer is used and a latent image by the difference of electrostatic potential is made visible. CONSTITUTION:A developer carrier 3 is opposed to an electrostatic latent image holding body 2, and the developer is supplied from a developer stirring chamber 5 to the carrier 3. The developer is fed in the width direction of a developed image by a feed and supply member 6 in the chamber 5. A developer feeding chamber 8 which is partitioned from the chamber 5 by a partitioning member 10 erected nearly in parallel with the member 6 and communicates with the chamber 5 at both ends is provided, and the developer is fed by a feeding member 9 in a reverse direction to the chamber 5 in the chamber 8. Thus, the developer is fed so as to circulate between the chambers 5 and 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device which is used in an image forming apparatus such as an electrophotographic copying machine or a printer, and which makes a developer adhere to an electrostatic latent image to visualize it. The present invention relates to a developing device that is used for developing.

[0002]

2. Description of the Related Art As a developing device using a one-component developer,
For example, the one shown in FIG. 11 has been conventionally known. In this developing device, a plurality of magnets are arranged in a fixed position in a rotatable cylindrical sleeve, and a developer carrier 103 for adsorbing and transporting the developer on the sleeve and a developer carrier 103. A developer regulating member 104, which is arranged so as to be in pressure contact with each other and regulates the developer adsorbed on the surface of the developer carrier and thins the layer, is housed in the housing 101.

The housing 101 is a developer carrying member 103.
Has an opening on the front side facing the electrostatic latent image holding member 102, and a stirring chamber 105 for transporting the developer T and stirring is formed along the developer carrying member 103 on the rear side. .. Inside the stirring chamber 105, there is provided a carrying and supplying member 106 which is arranged in parallel with the developer carrying member 103 and carries the developer and supplies it to the developer carrying member while rotating and stirring. Is attached with a detection device 107 for detecting the amount of developer in the stirring chamber. Further, one end of the stirring chamber 105 along the axial direction of the developer carrying member 103 communicates with the developer carrying-in passage 115 as shown in FIG. It is arranged up to the developer carrying-in path portion. A developer supply box 116 is provided above the developer carry-in path 115, and a necessary amount of developer T is appropriately dropped into the developer carry-in path 115 by driving the dispensing member 117. There is.

In such a developing device, the stirring chamber 10
The developer T supplied into the inside 5 is gradually conveyed toward the other end of the stirring chamber 105 by the conveyance supply member 106. Along with this, the developer supplied to the developer carrying member 103 and adsorbed on the surface thereof is made into a thin layer by the developer regulating member 104, and the developer carrying member 103 is transferred to the developing area facing the electrostatic latent image holding member 102. Is transported. The developer that has not contributed to the development is carried into the housing 101 again as the developer carrying member 103 rotates, and is separated from the developer carrying member 103.

Further, when the developer is consumed by the repeated development and the remaining amount of the developer in the stirring chamber 105 becomes small, the detection device 107 detects this and outputs a signal. Based on this signal, the dispensing member 117 provided in the developer supply box 116 is driven, and the developer carry-in path 1
The developer is dropped into 15. The developer introduced into the developer carry-in path 115 is transferred to the stirring chamber 1 by the transport supply member 106.
05 is introduced into one end and stirred to be the developer carrying member 103.
And is conveyed so as to be uniformly distributed in the stirring chamber 105. At this time, the developer is the developer carrier 10
3 is supplied to the surface of the developer carrier 103, is conveyed by the rotation of the developer carrier 103, passes through the developing area, and then returns to the stirring chamber 105, and is gradually conveyed toward the other end on the opposite side of the stirring chamber 105 while repeating the cycle. Will be.

[0006]

However, the developing device as described above has the following problems. When the developer T is conveyed in the axial direction of the developer carrier, and the carrier is adsorbed to the surface of the developer carrier and conveyed to and separated from the developing area repeatedly, the developer carried into the stirring chamber 105 is
The developer regulating member 104 is repeatedly rubbed.
For this reason, the developer on the other end side, that is, near the end on the side ahead in the transport direction of the stirring chamber 105 is more loaded than the developer on the side to which the developer supply box 116 is attached. , External additives (silica etc.) added to the toner to adjust the charge amount may get stuck in the toner,
Alternatively, the phenomenon of separation from the toner has occurred. On the leading end side in the transport direction of the stirring chamber where a large amount of the developer having such an abnormality is accumulated, the charge amount of the developer is lower than that on the side where the developer supply box 116 is located.

Further, the developer particles having a smaller particle diameter than the appropriate particle diameter contained in the developer and the developer particles having a large particle diameter make it difficult to obtain a required charge amount, and most of them do not contribute to the development. It remains on the carrier and is returned to the stirring chamber. For this reason, a large amount of toner having a small particle size and a large particle size is deposited on the end portion of the stirring chamber opposite to the developer supply side, and the charge amount of the developer is lower than that on the supply side. In the vicinity of the edge where a large amount of developer with such abnormalities or small particle size / large particle size developer accumulates, the image developed compared to the developer supply side on the opposite side due to insufficient charge However, there is a problem that the concentration of is decreased.

Incidentally, this problem is caused by a developing device of the type in which a developer is pressed by using a developer regulating member (blade) pressed against a developer carrying member as shown in FIG. 11 to form a thin layer. Even in a developing device of a type in which a thin layer of the developer is formed by a trimming member 124 which is not unique and is not in contact with the developer carrying member as shown in FIG. 12, a load is applied to the developer by trimming. Therefore, the above-mentioned problem occurs.

The present invention has been made in view of the above problems, and an object thereof is to prevent the developer having a low charge amount from being unevenly accumulated in the stirring chamber and to reduce the concentration over a long period of time. It is an object of the present invention to provide a developing device capable of forming a good image free from defects.

[0010]

In order to solve the above-mentioned problems, the present invention is arranged so as to face an electrostatic latent image holding member and conveys a one-component developer by adhering it to the surface thereof. A developer carrying member, a developer stirring chamber which is provided at a position facing the developer carrying member, stores the developer, and agitates the developer, and the surface of the developer carrying member in the developer stirring chamber. In a one-component developing device, which is arranged in parallel and rotates to stir and convey the developer and to feed the developer to a developer carrying member, the one-component developing device is erected substantially parallel to the feed member. And a developer transport chamber which is separated from the developer stirring chamber by the partition member and communicates with the developer stirring chamber at both ends, and the developer is transported in the opposite direction to the transport supply member in the developer transport chamber. And a transport member.

In the above-mentioned one-component developing device,
A detection unit having a vibrating film body and a processing circuit for processing the output of the detection unit, and a detection device for detecting the amount of the developer in the developer stirring chamber, only the detection unit being the partition member. It is desirable to be attached to.

Further, in the above-mentioned one-component developing device,
In the non-image area in the width direction of the image to be developed, the carrying / supplying member is provided with a carrying mechanism capable of carrying the developer in a predetermined direction along the axis of the carrying / supplying member. A stirring mechanism that stirs the developer in a plane perpendicular to the axis of the transport supply member may be provided.

The carrying and supplying member may be one that can carry the developer in a predetermined direction by rotating like a screw auger, a plate-shaped member, a rod-shaped member, or the like formed into a spiral shape. Good, positively conveying the developer in a predetermined direction, such as a rod-shaped member that is substantially parallel to the support shaft and that rotates around this support shaft, or a member that agitates from the rotating support shaft. However, when the distribution of the accumulated developer is not uniform, the developer may be conveyed so as to be even. Further, a combination of a member capable of transporting the developer in a predetermined direction and a member having only a function of leveling the unevenly distributed developer may be used.

The conveying member is a member such as a screw auger or a member formed in a spiral shape, which is capable of forcibly moving the developer in a predetermined direction. 4. The one-component developing device according to claim 3, wherein the transport mechanism provided in the transport supply member is capable of forcibly transporting the developer in the developer stirring chamber in the axial direction of the transport supply member. The agitation mechanism is a mechanism that agitates the developer and can convey the developer so that the developer is evenly distributed in the axial direction of the conveyance supply member.

[0015]

In the single-component developing device having the above-mentioned structure, the developer stirring chamber and the developer transport chamber partitioned by the partition member communicate with the developer stirring chamber at both ends, and the transport member is the developer transport chamber. Since the developer is conveyed in the direction opposite to the conveying and supplying member, the developer supplied to one end of the developer agitating chamber and conveyed to the other end in the developer agitating chamber does not pass through the developer conveying chamber. And is returned to the supply side of the developer stirring chamber. As a result, the developer is conveyed so as to circulate between the developer agitating chamber and the developer conveying chamber while being agitated, and the developer particles having a low charge amount are not unevenly accumulated. Further, since the entire developer is sufficiently agitated, the developer particles having an abnormality and the developer particles having a low charge amount can also contribute to the development in the developing area, and even if it is used for a long period of time, it can be totally Image density is less likely to decrease.

In the one-component developing device according to the second aspect, the detecting portion of the detecting device for detecting the amount of the developer in the developer agitating chamber is attached to the partition member which separates the developer agitating chamber and the developer conveying chamber. Since the amount of developer in the developer agitating chamber can be accurately detected, the developer is supplied to the developer agitating chamber by a signal output from the detection device, and the developer is always maintained in an appropriate amount. .. As a result, appropriate stirring and conveyance are performed, and a sufficient amount of developer is supplied to the developer carrier. In addition, by providing only the detection part of the above-mentioned detection device on the partition member and providing the processing circuit and the like on other parts outside the developing device, the partition member can be made thinner, and the developer transfer chamber can be efficiently transported. Be seen. As a result, the effect of preventing unevenly accumulated developer particles having a low charge amount is increased.

In the one-component developing device according to the third aspect of the present invention, since the feeding and supplying member has the feeding mechanism in the non-image area and the stirring mechanism in the image area, the developer stirring chamber and the developer feeding member are provided. When the developer is conveyed so as to circulate between the chamber and the chamber, sufficient developer is supplied from the developer agitating chamber to the image area of the developer carrier, which prevents the density of the image to be developed from decreasing. Will increase.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a one-component developing device according to the first embodiment of the present invention. FIG. 1 (a) is a cross-section in the width direction of a developed image, and FIG. (A) It is a cross section taken along line I-I in the figure. In this developing device, a part of the developing roller 3 (developer carrying member) is exposed at a portion of the housing 1 facing the electrostatic latent image holding member 2 so that the developing roller 3 (developer carrying member) approaches the electrostatic latent image holding member 2. It is provided so as to rotate, and the blade 4 (developer regulating member) is pressed against this developing roll. A developer stirring chamber 5 is provided in the housing 1 on the side opposite to the side of the developing roller 3 facing the electrostatic latent image holder 2, and further behind this, the developer stirring chamber 5 and a partition member. A developer transport chamber 8 is provided which is partitioned by 10 and communicates with the developer stirring chamber 5 at both ends in the axial direction of the developing roll 3.

In the developer stirring chamber 5, the developer is stirred and conveyed in the axial direction of the developing roll 3, and at the same time, the developing roll 3
The transport supply member 6 that supplies the developer to the developer transport chamber 8
A conveyance member 9 that conveys the developer in the opposite direction to the above-mentioned conveyance supply member 6 is installed therein. The developer carrying-in passage 1 is provided at one end of the developer stirring chamber 5 in the axial direction of the developing roll.
5 is connected, and a developer supply box (not shown) is provided above the developer carry-in path 15.

The developing roll 3 described above is one in which a rotatable cylindrical sleeve 3a is arranged on the outer periphery of a substantially cylindrical magnet member 3b which is fixedly supported. A developing pole N ₁ and a transport pole S are attached to the magnet member 3b by a magnetizing method.
₁ , an adsorption electrode N ₂ , and repulsion electrodes S ₂ and S ₃ are provided,
The magnetic developer is attracted and peeled off by these magnetic patterns.

The blade 4 is for thinning the magnetic developer adsorbed on the outer peripheral surface of the sleeve 3a, and the pressure contact portion with the sleeve is made of a soft elastic member. The soft elastic member is supported near one end of an elastic supporting member such as a stainless plate, and the other end of the elastic supporting member is fixed to the housing.

The carrier supply member 6 is supported so as to rotate through the developer agitating chamber 5 and the developer carrying-in passage 15 connected to the developer agitating chamber 5. The developer carrying-in path portion of the carrying / supplying member 6 is a screw having a carrying blade 6d spirally projecting from the peripheral surface of the rotating shaft 6a. In the non-image portion of the developer stirring chamber 5, a rod-shaped member is used as a pitch. Is 15m
m, the outer diameter is 26 mm, and the carrier portion 6b is attached around the rotary shaft 6a in a spiral shape. Development roll 3
In the image portion along, the rod-shaped member is attached substantially parallel to the rotary shaft 6a, and this rod-shaped member serves as the stirring unit 6c that rotates around the rotary shaft 6a. The number of revolutions of the conveying / supplying member 6 is set to 36.8 rpm, and the conveying / supplying member 6 rotates in the direction opposite to that of the developing roller 3 so that the developer dropped from the developer supply box into the developer carrying-in path 15 is stirred in the developer stirring chamber 5 It is possible to stir the developer in the developer stirring chamber 5, convey the developer in the axial direction of the developing roll, and supply the developer to the developing roll 3 as well.

The carrying member 9 is a screw which is supported in the developer carrying chamber 8 in parallel with the carrying and supplying member 6, has a carrying blade 9a having an outer diameter of 10 to 20 mm and a pitch of 10 to 15 mm, and has a rotation speed of 10 to 10. It rotates in the same direction as the developing roll 3 at 30 rpm and conveys the developer in the direction opposite to the conveying and supplying member 6. In addition, a reverse feeding portion 9b having the inclination of the conveying blade in the reverse direction is provided at the most downstream portion of the conveying member 9 in the conveying direction, that is, near the end portion on the developer supply side.

The partition member 10 is provided upright between the transport supply member 6 and the transport member 9, and has a developer stirring chamber 5 and a developer transport chamber 8 respectively.
An opening having a width of 30 mm is provided at both ends in the axial direction of the developing roll 3 to form a communicating portion between the developer stirring chamber 5 and the developer transport chamber 8. A toner level sensor 7 is attached to the partition member 10 to detect the amount of the developer in the developer stirring chamber 5, and the development is performed based on the detection signal output from the toner level sensor 7. Replenishment of the developer from the developer supply box is controlled. In FIG. 1, reference numeral 11
Is a tracking roll arranged coaxially with the developing roll 3 via a bearing to maintain a gap between the developing roll 3 and the electrostatic latent image carrier 2, and reference numeral 12 is a leakage of the developer from the housing 1. This is a sealing member that seals between the housing 1 and the developing roller 3 in order to prevent the above.

In such a developing device, the developer dropped into the developer carrying-in path 15 is carried into the developer stirring chamber 5 by the carrying / supplying member 6. In the developer stirring chamber 5, the toner is supplied to the surface of the developing roll 3 and is thinned by the blade 4 as the developing roll 3 rotates. Further, the electrostatic latent image carrier 2 is conveyed to a developing area which is close to and opposed to the electrostatic latent image carrier 2 and is attached to the electrostatic latent image to be developed. The developer that does not contribute to the development and remains on the developing roll 3 is returned to the developer stirring chamber 5 again,
It is mixed with the developer supplied to the developing roll 3.

The conveying and supplying member 6 can stir the developer in the image portion in the axial direction and supply the developer to the developing roll 3, and can convey the developer that is unevenly deposited so as to be leveled. The developer in the agitation chamber 5 is gradually conveyed in the direction from the developer supply side of the developer agitation chamber to the other end [the direction indicated by the arrow A in FIG. 1B] while repeating the above cycle. The developer that has reached the end portion on the opposite side of the developer supply side is carried into the developer carrying chamber 8 from the opening of the partition member 10, and is carried by the carrying member 9 in the reverse direction [direction shown by arrow B in FIG. 1 (b)]. That is, it is conveyed to the developer supply side. At the end portion on the developer supply side, the developer is returned from the opening of the partition member 10 to the developer stirring chamber 5, and the developer is stirred in the developer stirring chamber 5 and the developer transport chamber 8.
And are transported so as to circulate. As a result, the developer having a low charge amount or the developer having an abnormality is prevented from being unevenly accumulated, and the uniform developer is supplied to the developing roll 3. When the developer is carried into the developer stirring chamber 5 from the developer carrying chamber 8, the developer is efficiently transferred by the reverse feeding portion 9b of the carrying member 9.

FIG. 2 shows changes in the charge amount of the developer and the image density when repetitive development is carried out by the one-component developing apparatus of the above embodiment, and FIG. 2 (a) shows the number of developed images and the development. The relationship with the charge amount of the agent, and FIG. 6B shows the relationship between the number of developed images and the image density. Further, FIG. 3 shows changes in the charge amount and the image density of the developer when the development is repeatedly performed by the conventional one-component developing device. In the one-component developing device of the above embodiment, the developer stirring chamber 5
The developer on the developer supply side (carrying path side) and the developer near the end on the opposite side (opposite side) have substantially the same charge amount even after repeated development, Further, the charge amount before repeated development is almost the same value. Along with this, the image density is maintained substantially the same in the axial direction of the developing roll 3, that is, in the entire widthwise direction of the image formed, and hardly changes even after repeated development. On the other hand, in the conventional one-component developing device, it is recognized that the charge amount of the developer on the side opposite to the developer supply side (opposing side) decreases as the development is repeated, and the development density also decreases. ..

FIG. 4 shows the change in the particle size distribution of the developer when the development is repeatedly carried out by the one-component developing apparatus of the above-mentioned embodiment, and FIG. 4 (a) shows the superposition percentage,
(B) The figure shows the volume percentage. Further, FIG. 5 shows changes in the particle size distribution of the developer when the development is repeatedly performed by the conventional one-component developing device. In the one-component developing device of the above-described embodiment, the particle size distribution of the developer hardly changes even after repeated development, but in the conventional one-component developing device, the developer having a particle size of 7 μm to 10 μm decreases.
From this range, the ratio of the developer having the large particle size and the developer having the small particle size is increasing. This consumes the developer that easily flies from the surface of the developing roll to the electrostatic latent image carrier, but does not consume the developer with large particle size or small particle size that is not sufficiently charged, and the ratio of the developer in the developer agitating chamber is not consumed. Is expected to increase.

FIG. 6 shows the change in the volume percentage of the developer having a particle size of 5 μm or less after repeated development, and FIG. 6 (a) shows the development by the one-component developing apparatus of the above embodiment. In the case of carrying out the development, FIG. 6B shows the case where the development is carried out by the conventional one-component developing device. In the one-component developing device of the above embodiment, the developer having a small particle size of 5 μm or less tends to increase slightly, but it is shown that the increase amount is considerably smaller than that of the conventional developing device. Figure 2 above
As shown in FIG. 6, in the one-component developing apparatus which is an embodiment of the present invention, a uniform developer is supplied in the axial direction of the developing roll, and even if the developing is repeated many times, the uniform developing is stable. Agent supply is maintained.

FIG. 7 is a schematic sectional view showing a one-component developing device according to the second embodiment of the present invention. In this one-component developing device, auxiliary members 13 and 14 for assisting the transfer of the developer are provided at the communicating portion between the developer stirring chamber 5 and the developer transport chamber 8. Each of the auxiliary members 13 and 14 has a rod-shaped member attached to the rotating shaft substantially parallel to the rotating shaft. The rod-shaped member has a rotation radius of 3 mm and rotates at 10 to 30 rpm. As a result, the developer is positively introduced from the developer transport chamber 8 to the developer stirring chamber 5 at the developer supply side communication portion, and from the developer stirring chamber 5 to the developer transport chamber 8 at the opposite communication portion. Is what you do.

FIG. 8 is a schematic sectional view showing a one-component developing device according to the third embodiment of the present invention. In this one-component developing device, as the conveying member 19, a member having a rod-shaped member formed in a spiral shape is used, and the outer diameter is 26 mm,
The spiral pitch is 10 to 20 mm, and it rotates at 15 to 30 rpm. Further, as the toner level sensor 17, a sensor having a vibrating film body and detecting the amount of the developer by detecting that the developer comes into contact with the film body and the vibration is limited is used. This toner level sensor 17 is shown in FIG.
The conventional one shown in (a) is a detection unit 21 and a processing circuit unit 22.
While and were integrated and had a thickness of 10 mm,
As shown in FIG. 9B, the detection unit 23 and the processing circuit unit 24 are separated, and the thickness of the detection unit is 4 mm. By attaching only the detection unit 23 to the partition member 10, the thickness of the partition member 10 can be reduced, and the developer can be efficiently transported in the developer transport chamber.

FIG. 10 shows another example of the carrying member that can be used in the one-component developing apparatus of the present invention.
As shown in FIGS. (A) and (b), a part of the axial direction has a carrier blade or a spiral member capable of carrying the developer in a predetermined direction, and the other part of the developer has a spiral shape. It is also possible to have a rotating member that conveys the accumulated amount so as to level it when the amount is not uniform. In addition, the rotating member 30 shown in FIG. 3B is such that an annular body is attached around the rotating shaft 31 so as to be inclined with respect to the direction perpendicular to the rotating shaft. Further, by using a flexible plate-shaped member formed in a spiral shape as shown in FIG. (C), even if the axis of the developer transport chamber includes a curved line or a broken line, The developer can be conveyed.

[0033]

As described above, in the one-component developing apparatus of the present invention, the developer stirring chamber and the developer transport chamber, which are partitioned by the partition member, communicate with each other at both ends, and the transport supply member and the transport member are used. Since the toner is conveyed so as to circulate, a developer having an abnormality or a developer having a low charge amount is not unevenly deposited, and a good image without a decrease in density is formed. Further, in the above-described one-component developing device, by mounting only the detection unit of the detection device for detecting the amount of developer in the developer stirring chamber to the partition member, the amount of developer in the developer stirring chamber is accurately detected, The replenishment of the developer can be performed accurately, and the partition member can be thinned to more efficiently carry the developer. Further, by making the feeding and supplying member have the feeding function in the non-image area and the agitating function in the image area, the developer can be efficiently delivered and sufficient developer is supplied to the developer carrier. It

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of a one-component developing device that is a first embodiment of the present invention.

FIG. 2 is a diagram showing changes in the charge amount of a developer and the image density when repetitive development is performed by the one-component developing device in the above-described embodiment.

FIG. 3 is a diagram showing changes in the charge amount and image density of a developer when repeated development is performed by a conventional one-component developing device.

FIG. 4 is a diagram showing changes in the particle size distribution of the developer when the development is repeatedly performed by the one-component developing device of the above-described embodiment.

FIG. 5 is a diagram showing a change in particle size distribution of a developer when the development is repeatedly performed by a conventional one-component developing device.

FIG. 6 is a diagram showing changes in the ratio of small-diameter developer particles when repetitive development is performed by the one-component developing device of the example and the conventional one-component developing device.

FIG. 7 is a schematic cross-sectional view showing the configuration of a one-component developing device that is a second embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view showing the configuration of a one-component developing device which is a third embodiment of the present invention.

9 is a schematic diagram showing a developer amount detecting device used in the one-component developing device shown in FIG. 8 in comparison with a conventional device.

FIG. 10 is a shape diagram showing an example of a carrying member that can be used in the one-component developing device according to the embodiment of the present invention.

FIG. 11 is a schematic sectional view showing an example of a conventional one-component developing device.

FIG. 12 is a schematic sectional view showing another example of a conventional one-component developing device.

[Explanation of symbols]

 1 Housing 2 Electrostatic Latent Image Holder 3 Developing Roll (Developer Carrier) 4 Blade (Developer Regulation Member) 5 Developer Stirring Chamber 6 Conveyance Supply Member 7 Toner Level Sensor (Detecting Device) 8 Developer Conveyance Chamber 9 Conveyance Member 10 Partition member 17 Toner level sensor 19 Transport member

Claims (3)

[Claims] 1. An electrostatic latent image holding member is disposed to face the electrostatic latent image holding member,
A developer carrier for adhering and transporting a one-component developer, a developer stirring chamber provided at a position facing the developer carrier, for storing the developer and agitating the developer, and the developer stirring chamber. In a one-component developing device provided in a stirring chamber substantially parallel to the surface of the developer carrying member, and rotating and stirring and carrying the developer, and a carrying supply member for supplying the developer to the developer carrying body. , A developer transport chamber that is partitioned from the developer stirring chamber by a partition member that is installed substantially parallel to the transport supply member, and that communicates with the developer stirring chamber at both ends, and in the developer transport chamber, A one-component developing device comprising: a transport member that transports the agent in the opposite direction to the transport supply member. 2. The one-component developing device according to claim 1, further comprising: a detector having a vibrating film body; and a processing circuit for processing an output of the detector, wherein the developer in the developer stirring chamber is provided. A one-component developing device having a detection device for detecting the amount, wherein only the detection part is attached to the partition member. 3. The one-component developing device according to claim 1 or 2, wherein the conveying and supplying member supplies a developer to a non-image area in a width direction of an image to be developed. A transport mechanism capable of transporting in a predetermined direction along the axis is provided,
The one-component developing device is characterized in that the image area is provided with a stirring mechanism for stirring the developer in a plane perpendicular to the axis of the conveying and supplying member.