JPH0658568B2 - Electrostatic latent image developing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic latent image developing device used in an electrostatic copying machine or the like, more specifically, an electrostatic latent image developing device using a so-called two-component developer composed of carrier particles and toner particles. Regarding the device.

[0002]

2. Description of the Related Art As a typical example of an electrostatic latent image developing device using a two-component developer, there is an electrostatic latent image developing device of the form disclosed in JP-A-57-190971. . This electrostatic latent image developing device includes a developing container that contains a developer composed of carrier particles and toner particles. A developer applying means and a developer stirring means are arranged in the developing container. The developer applying means, which is expediently composed of a cylindrical sleeve member rotatable in a predetermined direction and a magnet arranged in the sleeve member, comprises:
In the developer pumping area, a part of the developer in the developing container is held on the surface, the developer is carried to the developing area and applied to the electrostatic latent image to develop the electrostatic latent image into a toner image. There is a developer peeling area downstream of the developing area and upstream of the developer pumping area as viewed in the moving direction of the developer held and carried on the surface of the developer applying means. It is disposed in association with the developer peeling area and the upstream end of the developer scooping area. A brush cutting region exists downstream of the developer drawing region and upstream of the developing region, and a brush cutting unit for removing excess developer from the surface of the developer applying unit is provided in this brush cutting region. There is. A partition plate is provided between the ear cutting means and the developer stirring means, and the developer removed from the surface of the developer applying means by the action of the ear cutting means passes through the upper surface of the partition plate to stir the developer. Guided by means.

In the electrostatic latent image developing device of the above-mentioned form,
The developer stirring means sufficiently stirs the carrier particles and the toner particles so that the toner particles are triboelectrically charged to the required polarity, and the developer is appropriately mixed in the width direction and homogenized in the width direction. It is important to be punished. Therefore, in the electrostatic latent image developing device disclosed in JP-A-57-190971, a plurality of guide ridges are arranged on the upper surface of the partition plate at intervals in the width direction. Each of the guide protrusions is inclined toward the developer agitating means from the other end side (rear end side) in the width direction to one end side (front end side). Further, a developer moving mechanism is arranged between the partition plate and the developer stirring means. The developer moving mechanism includes a tubular member extending in the width direction and a spiral blade arranged in the tubular member. The tubular member has an inlet on the upper surface on one end side and an outlet on the lower surface on the other end side. Has been formed. The developer removed from the surface of the developer applying unit and moved onto the partition plate is diverted from the other end side in the width direction to the one end side by the guiding action of the above-mentioned guide ridge extending obliquely. Then, the developer that has flowed into the tubular member from the inlet of the tubular member in the developer transfer mechanism is moved to the other end side by the spiral blade that is rotationally driven, and is discharged from the outlet of the tubular member to the developer stirring means. It is made to flow down. Thus, the developer is mixed in the width direction.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the electrostatic latent image developing device as described above disclosed in Japanese Patent No. 190971, (1) it is necessary to dispose a developer moving mechanism between the partition plate and the developer stirring means. The size of the apparatus increases due to the arrangement of the developer transfer mechanism,
(2) The developer does not sufficiently flow into the tubular member from the inlet formed in the upper surface of the tubular member of the developer moving mechanism at one end side, and the developer transport mechanism does not function as required.
There is a problem to be solved.

The present invention has been made in view of the above facts, and a technical problem to be solved by the invention is an improved electrostatic discharge capable of sufficiently well mixing a developer in the width direction without increasing the size of the apparatus. To provide a latent image developing device.

[0006]

In order to achieve the above-mentioned technical solution, in the present invention, by flowing over a partition plate having an inclined guide ridge formed on the upper surface, one end side to the other end side is flowed. A developer moving blade is installed in the developer stirring means in order to move the developer drifted to one end side from the other end side. A circular end plate with a guide ridge that moves inward in the direction to feed the developer moving blade is provided, and the developer is moved radially outward in relation to the other end side of the developer moving blade. At least a circular end plate having guide ridges for discharging from the developer moving blade is arranged.

That is, according to the present invention, in order to achieve the above-mentioned technical solution, a developer container containing a developer comprising carrier particles and toner particles, and a developer in the developer container in the developer scooping region are provided. A part of the developer is applied to the surface of the developer container, the developer applying means for carrying the developer to the developing area, the developer agitating means for agitating the developer in the developing container, and the developer applying means are removed from the surface. A partition plate for guiding the developer to the developer agitating means, and a plurality of guide ridges are provided on the upper surface of the partition plate at intervals in the width direction, and each of the guide ridges is provided. From the other end side, the developer is inclined from the other end side toward the one end side in the width direction toward the developer stirring means, and is removed from the surface of the developer applying means and is made to flow on the partition plate. In the electrostatic latent image developing device that can be moved to the one end side The developer stirring means includes a rotating shaft portion extending in the width direction, a tubular portion concentrically arranged with respect to the rotating shaft portion, and a circumferential surface of the tubular portion in the width direction with a circumferential interval therebetween. A plurality of extending stirring blades and a developer disposed in a gap between the rotating shaft portion and the tubular portion and for moving the developer introduced from the one end side to the gap to the other end side through the gap. The circular shape including a movable blade and a pair of circular end plates arranged at both ends of the rotary shaft portion at intervals outward in the width direction with respect to both ends of the tubular portion, and the circular shape positioned at the one end side. A plurality of guide ridges are formed on the inner surface of the end plate to move the developer inward in the radial direction into the gap between the rotary shaft portion and the tubular portion, and the other end of the guide ridge is formed. On the inner surface of the circular end plate located on the side, the developer is moved outward in the radial direction so that the gap between the rotary shaft portion and the tubular portion is A plurality of guide projections for deriving is formed, an electrostatic latent image developing device is provided, characterized in that.

[0008]

In the electrostatic latent image developing apparatus of the present invention, the developer moving blade is disposed in the gap between the rotating shaft portion and the tubular portion of the developer stirring means. The device does not increase in size due to its existence. A pair of circular end plates are provided at both ends of the rotating shaft part with a space from both ends of the tubular part, and the developer is moved radially inward on the inner surface of the circular end plate on one end side. At least a guide ridge is formed in the gap, and accordingly, introduced into the developer moving blade, and the developer is moved radially outward on the inner surface of the circular end plate on the other end side, and thus from the gap, and accordingly the developer. Since the guide ridge extending from the moving blade is formed, the developer moving blade can be sufficiently fed with the developer, and also the developer moving blade can be sufficiently fed with the developer, and thus the developer moving can be performed. The blade allows the developer to move sufficiently well from one end side to the other end side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an electrostatic latent image developing device constructed according to the present invention will be described in more detail with reference to the accompanying drawings.

Referring to FIG. 1, FIG. 2 and FIG. 3, the electrostatic latent image developing device 2 shown in FIG. 1 has an interval in the front-back direction (direction perpendicular to the paper surface in FIG. 1, left-right direction in FIG. 2). It comprises a developer housing 12 defined by front and rear walls 4 and 6 (see FIG. 2) arranged side by side, a concave bottom wall 8 and a side wall 10. The lower part of the developing housing 12 defines a developing container 16 for containing a so-called two-component developer 14 composed of carrier particles and toner particles.

A developer applying means 18 is arranged in the developing housing 12. The developer applying unit 18 in the illustrated embodiment is a cylindrical sleeve member 22 that is rotationally driven.
And a stationary permanent magnet 24 disposed in the sleeve member 22. Disc-shaped end plates 26 (only one of which is shown in FIG. 3) are attached to both ends of the cylindrical sleeve member 22, and each of the end plates 26 has a front-back direction (in other words, a width direction of the developing device 2). 2) is fixed and constitutes a rotation axis extending substantially horizontally in the width direction, and the support shaft 28 is rotatably supported between the front wall 4 and the rear wall 6. This support shaft 2
A connecting means (not shown) is attached to one side of 8 (a supporting shaft located at the rear in the front-rear direction), and the connecting means is driven to a drive source (not shown) of the electrostatic copying machine via an appropriate means. It is connected. Therefore, the cylindrical sleeve member 22 is supported by the drive source on the support shaft 28 (and thus the rotation axis).
Is rotated in a predetermined direction (counterclockwise in FIG. 1) indicated by an arrow 20. The stationary permanent magnet 24 is in the form of a roll and has a plurality of magnetic poles (that is, three S poles and two N poles located between them) circumferentially spaced from each other on the peripheral edge thereof. is doing.

Cylindrical sleeve member 2 of developer applying means 18
Around the circumference of 2, the developer scooping area 30, the spike cutting area 32, and the developing area 34, which are sequentially located in the rotation direction shown by the arrow 20, are located.
And there is a developer stripping area 36. Developer pumping area 3
0 is disposed on one side of the sleeve member 22 (on the right side in FIG. 1), the bristle cutting region 32 is disposed on the substantially uppermost portion of the sleeve member 22, and the developing region 34 is on the other side of the sleeve member 22 (see FIG. 1).
On the left side), and the developer stripping area 36 is on one side of the sleeve member 22 and on the developer pumping area 3
It is arranged below 0.

A head cutting means 38 is provided in the head cutting area 32. In the illustrated embodiment, the spike cutting means 3 is provided by a drooping protrusion provided on the member 39 fixed to the inner surface of the side wall 10.
8 is formed. The tip of the bristle cutting means 38 is spaced at a slight interval, which may be, for example, about 1 mm, and the sleeve member 2 is provided.
It is located close to the peripheral surface of 2. In the developing area 34, the peripheral surface of the sleeve member 22 is rotatable in the direction indicated by arrow 42 in the electrostatic copying machine through an opening 40 defined between the lower edge of the side wall 10 and one edge of the bottom wall 8. It is opposed to the peripheral surface of the rotary drum 44 mounted on the vehicle at a slight interval. The rotary drum 44 has a photoconductor on its peripheral surface, and an electrostatic latent image is formed on the photoconductor by a known method.

Inside the developing housing 12, there is further disposed a developer stirring means composed of a rotary stirring mechanism 46. As is clear from FIG. 1, the rotary stirring mechanism 46
Is disposed adjacent to the one side of the sleeve member 22,
When viewed in the rotational direction of the sleeve member 22 shown by the arrow 20, the sleeve member 22 is located in a region extending from the developer peeling region 36 to the upstream end of the developer scooping region 30. Referring to FIGS. 1 and 3, the illustrated rotary stirring mechanism 46 includes a rotary shaft portion 4 extending substantially parallel to the rotary axis of the sleeve member 22.
8, a tubular portion 50 concentrically provided with respect to the rotary shaft portion 48, and a widthwise direction (a direction perpendicular to the paper surface in FIG. 1, in FIG. 3) provided at intervals on the circumferential surface of the tubular portion 50. A plurality of stirring blades 52 extending in the direction from the lower left to the upper right), and a spiral blade 54 that constitutes a developer moving blade disposed between the rotary shaft portion 48 and the tubular portion 50. There is. The spiral blade 54 spirally extends from one end side in the width direction of the tubular portion 50 to the other end side in the width direction. Also,
A rectangular notch 56 is formed in the stirring blade 52 extending radially outward. This notch 56
Is preferably formed on at least most of the plurality of stirring blades 52 by appropriately shifting the position in the width direction. In the illustrated embodiment, as is clear from FIG. 4 in which the tubular portion 50 is expanded, one notch 56 is formed in each of the plurality of stirring blades 52. The notch 56 is formed by shifting the position in the width direction, and one notch is provided for the entire circumference of the tubular portion 50 and is provided so as to be provided over the entire width. A through hole having a rectangular cross section extending in the axial direction is formed in the rotary shaft portion 48 of the rotary stirring mechanism 46 described above, and the rectangular shaft member 58 (the rotation axis of the rotary stirring mechanism 46 is configured in the through hole. ) Is installed. Circular end plates 60 (see FIGS. 2 and 3) are provided on both ends of the shaft member 58, and hence on both sides of the rotary stirring mechanism 46, at both ends of the tubular portion 50 at intervals in the width direction. It is mounted so as to rotate together with. In the illustrated embodiment, the rotary stirring mechanism 46
A circular end plate 60 having a rectangular hole is inserted into each of the projecting portions of the shaft member 58 projecting from both ends of the shaft member 58, and the boss portion 62 provided on the inner surface thereof is brought into contact with the tubular portion 50. As a result, the circular end plates 60 are attached to both ends of the tubular portion 50 at intervals in the width direction. One circular end plate 60 mounted on one end side of the shaft member 58 (the circular end plate 60 disposed on the left side in FIG. 2 and the lower left side in FIG. 3)
A plurality of guide ridges 64 for moving the developer 14 inward in the radial direction into the gap defined between the rotary shaft portion 48 and the tubular portion 50 (in the embodiment). 4 are formed in FIG. 2, one of which is shown in FIG. 2). In addition, the developer 14 is radiused on the inner surface of the other circular end plate 60 (the circular end plate 60 disposed on the right side in FIG. 2 and the upper right side in FIG. 3) mounted on the other end side of the shaft member 58. A plurality of guide ridges 66 (four pieces are formed as shown in FIG. 3) are provided to guide the ridges 66 to move outward in the direction to be guided out of the gap between the rotary shaft 48 and the tubular portion 50. ing. The shaft member 58 to which the rotary stirring mechanism 46 and the circular end plate 60 are attached is rotatably supported by the front wall 4 and the rear wall 6 as shown in FIG. A coupling means (not shown) is attached to the other end of the shaft member 58 (hence, the rear end in the front-rear direction), and the coupling means is drivingly coupled to the drive source (not shown) via an appropriate means. ing. Therefore, the rotary stirring mechanism 46 is rotated in the predetermined direction (counterclockwise direction in FIG.
Is rotated in the same direction as the rotating direction of the sleeve member 22).

A partition plate 7 is provided in the developing housing 12.
0 is also set. Referring to FIGS. 1 to 3, the partition plate 70 shown in the figure has an inclined portion 72 that extends from the lower end located above the rotary stirring mechanism 46 to the left in FIG. The upper end of the portion 72 has a horizontal end portion 74 that extends substantially horizontally to the left in FIG. The horizontal upper end portion 74 is located somewhat upstream of the ear cutting region 32 in which the ear cutting member 38 is located. As clearly shown in FIG. 2 and FIG. 3, a plurality of (in the case of the drawing) the upper surface of the inclined portion 72 of the partition plate 70 is spaced apart in the width direction thereof (that is, the front-back direction perpendicular to the paper surface in FIG. 1). Is 12)
The guide ridges 76 are provided. Such guide ridges 76
Each of them is inclined toward the lower end, that is, toward the rotary stirring mechanism 46 from the other end side to one end side (right side to left side in FIG. 2, upper right side to lower left side in FIG. 3). As is apparent from FIG. 1, the partition plate 70 having the above-described configuration is a developer that is conveyed from above the rotary stirring mechanism 46 to the upstream side of the ear cutting region 32 and from the developer pumping region 30 to the upstream side of the ear cutting region 32. 14 extends above the moving path which is gradually raised.

The member 39 is also provided with a guide portion 78 extending upward from the bristle cutting means 38. Referring to FIG. 1, the guide portion 78 extends from the spike cutting means 38, and thus upward from the surface of the sleeve member 22 to the one side (the right side in FIG. 1) in a slanted manner, and the lower surface thereof forms the developer. A guide surface for guiding the above to one side above. At the central portion in the width direction of the guide portion 78, there is fixed a contact type developer detector 80 which detects the inductance of the developer 14 corresponding to the ratio of the carrier particles and the toner particles and which may have a known form per se. There is. As will be easily understood by referring to FIG. 1, the circular opening is formed in the guide portion 78, and the circular detector 8 of the developer detector 80 is formed.
2 is located in the opening. Circle detector 8
The lower end surface of 0 forms the developer contact surface 84, and the developer detector 8
0 detects the inductance of the developer 14 in contact with the developer contact surface 84. As shown in FIG. 1, the developer contact surface 84 is exposed in the same plane as the guide surface of the guide portion 78.

A toner particle container 88 for containing the toner particles 86 is further arranged on the developing housing 12. A toner particle discharge opening 90 is formed at the lowermost end of the toner particle container 88. The toner particle discharge opening 90 is provided with an arrow 68 of the rotary stirring mechanism 46.
When viewed in the rotation direction indicated by, the rotary stirring mechanism 46 is positioned slightly upstream of the uppermost part. Toner particle supply means 92 is attached to the toner particle discharge opening 90. In the illustrated embodiment, the toner particle supply means 92 comprises a toner particle supply roller 94 rotatably mounted immediately above the toner particle discharge opening 90. A large number of recesses or grooves are formed on the peripheral surface of the toner particle supply roller 94. The toner particle supply roller 94 is located in a direction indicated by an arrow 96 by a drive source (not shown) such as a stepping motor which is selectively rotated according to the inductance of the developer detected by the developer detector 80. It can be rotated a fixed amount. When the toner particle supply roller 94 is rotated, the toner particles 86 are accommodated in a large number of recesses or grooves existing on the peripheral surface of the toner particle supply roller 94 and are carried to the toner particle discharge opening 90, and then the toner particle discharge opening 90. Rotating stirring mechanism 46 through 90
(For details, see arrow 6 from the uppermost part of the rotary stirring mechanism 46.
The toner particles 86 are supplied to the developing container 16 from the toner particle container 88 in this manner.

In the developing device 2 as described above, the following behavior occurs due to the rotation of the sleeve member 22 of the developer applying means 18 in the direction shown by the arrow 20. Figure 1
In the developer scooping region 30, a part of the developer 14 existing in the developing container 16 is partially removed by the magnetic attraction force of the stationary permanent magnet 24 in the sleeve member 22.
Is adsorbed and held on the peripheral surface of the. And the sleeve member 22
The developer 14 adsorbed on the peripheral surface of the sleeve member 22
Is rotated in the direction indicated by the arrow 20 and is moved in the direction indicated by the arrow 20, gradually raised from the developer scooping region 30 and conveyed to the panicle cutting region 32. In this case,
As will be easily understood from the above, the developer 14 is moved along the peripheral surface of the sleeve member 22 through the developer moving path located below the partition plate 70.

In the ear cutting plate 32, the sleeve member 22
To the developer 14 adsorbed and held on the peripheral surface of
8 acts to remove the excess developer 14 from the peripheral surface of the sleeve member 22, thus making the layer thickness of the developer 14 adsorbed and held on the peripheral surface of the sleeve member 22, that is, the spike length to a required value. . The developer 14 removed from the peripheral surface of the sleeve member 22 by the action of the bristle cutting means 38 is guided by the guide portion 7.
8 is guided by the guide surface 8 and moves away from the surface of the sleeve member 22 and is slanted upward toward the upstream side as viewed in the moving direction of the developer 14 (the direction indicated by the arrow 20). It is guided to the horizontal upper end portion 74. The horizontal upper end 7
The developer 14 guided to No. 4 then flows on the inclined portion 72 and flows down on the rotary stirring mechanism 46. When flowing on the inclined portion 72, the guide ridges 76 of the inclined portion 72 move the partition plate 7
The developer 14 is biased from the other end side to the one end side (right side to left side in FIG. 2) because it is inclined from the other end side of 0 to the one end side. The developer 14 removed from the peripheral surface of the sleeve member 22 and guided to the guide surface of the guide member 78 has the developer contact surface 84 of the developer detector 80 exposed on the guide surface. Contacting the contact surface 84, the developer detector 80 therefore detects such an inductance of the developer 14.

Next, the developer 14 adsorbed and held on the peripheral surface of the sleeve member 22 is the arrow 2 of the sleeve member 22.
The toner in the developer 14 is conveyed by the rotation in the direction indicated by 0 to the developing area 34, and is brought into contact with the photosensitive member on the rotating drum 44 which is rotated in the direction indicated by the arrow 42 in the developing area 34. Particles are applied to the electrostatic latent image on the photoreceptor to develop the electrostatic latent image into a toner image.

Thereafter, the developer 14 adsorbed and held on the peripheral surface of the sleeve member 22 is carried to the developer peeling area 36 by the rotation of the sleeve member 22 in the direction shown by the arrow 20. In the developer peeling area 36, the magnetic pole is not present in the stationary permanent magnet 24, and therefore the magnetic attraction force is extremely small, and in addition, the development is stirred by the rotary stirring mechanism 46 which is rotated in the direction shown by the arrow 68. Agent 14
Is applied to the peripheral surface of the sleeve member 22, so that the developer 14 is separated from the peripheral surface of the sleeve member 22.

The rotary stirring mechanism 46, which is rotated in the direction indicated by the arrow 68, rotates and flows on the partition plate 70 and the developer 14 separated from the sleeve member 22 in the developer separation area 36 as described above. The developer 14 flowing down onto the stirring mechanism 46 and the toner particles 86 flowing down onto the rotating stirring mechanism 46 from the toner particle discharge opening 90 of the toner particle container 88 by the action of the selectively rotated toner particle supply roller 94. After stirring, the carrier particles and the toner particles in the developer 14 are thus uniformly mixed and the toner particles are triboelectrically charged to a specific polarity, and thereafter, the toner particles are fed to the developer scooping region 30. Then, while the rotary stirring mechanism 46 is rotated, the development is moved from the other end side toward one end side of the tubular portion 50 of the rotary stirring mechanism 46 by the action of the guide protrusions 76 of the partition plate 70. Agent 1
4 is formed on the circular end plate 60 by passing between one end of the tubular portion 50 and one circular end plate 60 (the circular end plate 60 disposed on the left side in FIG. 2 and the lower left side in FIG. 3). It is guided by the guide protrusion 64 and introduced into the gap between the rotary shaft portion 48 and the tubular portion 50. Developer 14 introduced into the gap
Is a rotary stirring mechanism 46 rotated in a direction indicated by an arrow 68.
By the action of the spiral blade 54, the inside of the gap is moved from one end side to the other end side (from left side to right side in FIG. 2, from lower left side to upper right side in FIG. 3) to the other end of the tubular portion 50. Then, it is guided by the guide ridge 66 formed on the other circular end plate 60 (the circular end plate 60 disposed on the right side in FIG. 2 and the upper right side in FIG. 3), and the other end of the tubular portion 50 and this It is led out from the inside of the gap through the gap with the circular end plate 60. Therefore, the guide ridges 7 of the partition plate 70
The developer 14 biased to one end side by 6 is moved to the other end side through the gap between the rotary shaft portion 48 of the rotary stirring mechanism 46 and the tubular portion 50, and thus the developing container 1
The developer 14 in 6 is homogenized in the width direction.

Further, the toner particles 86 dropped by the rotation of the toner particle supply roller 94 through the toner particle discharge opening 90 pass through the notch portion 56 formed in the stirring blade 52, and then the stirring blade 52. The toner particles 86 are supplied to the developer 14 which is being agitated, and thus the new toner particles 86 are surely supplied to and mixed with the developer 14. In addition, the notch portion 56 is, as shown in FIG.
The new toner particles 86 are substantially uniformly supplied over the entire width of the rotary stirring mechanism 46 because one particle is provided over the entire circumference of the rotary stirring mechanism 46.

[0024]

In the electrostatic latent image developing device of the present invention,
The partition plate having the inclined guide ridges, the developer moving blade incorporated in the developer stirring means, and the pair of circular end plates having the guide ridges formed on the inner surface thereof, without the need for enlarging the apparatus. By the action, the developer is mixed well in the width direction.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electrostatic latent image developing device constructed according to the present invention.

FIG. 2 is a plan view showing a partition plate and its vicinity in the electrostatic latent image developing device of FIG.

3 is a perspective view showing a partition plate, a developer applying unit, and a rotary stirring mechanism in the electrostatic latent image developing apparatus of FIG. 1, which is partially disassembled and partially cut away.

4 is a development view showing a state where a tubular portion of the rotary stirring mechanism of FIG. 3 is developed.

[Explanation of symbols]

 2: Electrostatic latent image developing device 12: Developing housing 14: Developer 16: Developing container 18: Developer applying means 22: Cylindrical sleeve member 24: Stationary permanent magnet 30: Developer scooping area 32: Spike cutting area 34: Development area 36: Developer peeling area 38: Ear cutting means 46: Rotating stirring mechanism (developer stirring means) 52: Stirring blade 54: Spiral blade (developer moving blade) 60: Circular end plate 64: Guide ridge 66: Guide ridge 70: Partition plate 76: Guide ridge 80: Developer detector 86: Toner particles 88: Toner particle container 92: Toner particle supply means

Claims (2)

[Claims] 1. A developer container containing a developer composed of carrier particles and toner particles, and a part of the developer in the developer container is held on the surface in the developer scooping region, and the developer is carried to the developing region. A developer applying unit, a developer stirring unit that stirs the developer in the developing container, and a partition plate that guides the developer removed from the surface of the developer applying unit to the developer stirring unit. A plurality of guide ridges are provided on the upper surface of the partition plate at intervals in the width direction, and each of the guide ridges extends from the other end in the width direction toward one end side toward the developer stirring means. In the electrostatic latent image developing device, the developer, which is inclined, is removed from the surface of the developer applying means and is made to flow on the partition plate, is moved from the other end side to the one end side. The stirring means includes a rotating shaft portion extending in the width direction, and the rotating shaft portion A tubular portion arranged concentrically with each other, a plurality of stirring blades extending in the width direction at circumferential intervals on the peripheral surface of the tubular portion, and in a gap between the rotary shaft portion and the tubular portion. A developer moving blade for moving the developer introduced from the one end side into the gap to the other end side through the gap, and a gap outwardly in the width direction with respect to both ends of the tubular portion. And a pair of circular end plates disposed at both ends of the rotary shaft portion, the inner surface of the circular end plate located on one end side of the rotary shaft portion is made to move the developer inward in the radial direction to rotate the developer. A plurality of guide ridges for introducing into the gap between the shaft portion and the tubular portion are formed, and the inner surface of the circular end plate located on the other end side is provided with the developer in a radially outward direction. A plurality of guide ridges are formed to be moved to the outside and led out from the gap between the rotary shaft portion and the tubular portion. Electrostatic latent image developing device according to. 2. The developer moving blade is a spiral blade extending spirally from the one end side to the other end side.
The electrostatic latent image developing device described.