JPS5857157A - Developing device - Google Patents

Abstract

PURPOSE:To design a driving part compactly, by only controlling the turning- on/off of an electromagnetic clutch electrically to control freely the driving and the stop of a developing device. CONSTITUTION:An electromagnetic spring clutch unit Cl consists of a clutch shaft 30, an electromagnetic part 31 attached to one end of this shaft 30, a transmission gear G2 which is pressed into the other end to be made into one body together with the shaft 30, and a developing sleeve gear G1 which is fitted loosely to the shaft 30 between the electromagnetic part 31 and the transmission gear G2, and the tip part in the side of a transmission gear G3 of the clutch shaft 30 is inserted to the tip part of an outside projecting shaft 191 of a device box deep plate 5 of a developing sleeve unit, and the gear G2 is connected rotatably as one body by a pin 32. When power is supplied from the controlling system of a copying machine to the electromagnetic part 31, a clutch plate 311 is moved toward the developing sleeve gear G1 and is engaged with this gear G1, and the electromagnetic clutch unit Cl is made into one body through the gear G1, the clutch shaft 30, and the clutch plate 311.

Description

[Detailed description of the invention] The latent image of the present invention, electric potential image, magnetic image, etc.
This invention relates to a developing device for imaging.

Conventionally, dry development gII methods for developing electrostatic charge patterns and the like are divided into two-component development methods and one-component development methods when classified based on the composition of the developer. The two-component 3J imaging method, in which the former tUtm agent consists of a mixture of carrier particles such as iron powder or glass beads and toner particles that essentially develop an electrostatic image, is based on the mixing ratio of carrier particles and toner particles. It has the drawbacks of fluctuations in image density due to changes and deterioration of image quality due to deterioration of the yellow and yellow particles.

On the other hand, the latter one-component development method does not have the drawbacks of the above-mentioned two-component development method because carrier particles are not present, and is a promising development method. The commonly known and used one-component 3JT developer is characterized by the need for a means to transport the developer to the 111gI region that faces the electrostatic image and frictional charging due to relative motion. 4, which includes magnetic powder.

However, the content of the magnetic powder is naturally limited because heat, pressure, or other means are used to fix the toner on the transfer paper. . In practice, magnetic powder occupies 10 to 60 weight of toner particles, but due to the difference in specific gravity between resin and magnetic powder, the volume occupancy of magnetic powder in toner particles is less than 20 parts. Since the volume occupancy rate of the magnetic powder in the toner is small, the behavior of the toner in the magnetic field is different from that of the magnetic powder alone, and the mR at the magnetic pole position is small.
To form a long brush with sparse particles, if the thickness of the toner layer on the toner support member is regulated to a few, the toner layer on the support member will tend to be uneven. easy to become.

This non-uniformity of the toner layer on the supporting member is easily reproduced directly in the dust@image, and since the toner layer is dense, variations in layer thickness may cause the surface of the photoconductor, which is the electrostatic image holding member, to There is a risk of toner agglomeration or damage to the photoconductor due to pressure contact.

Therefore, in this sense, in a developing method using a one-component magnetic toner, it is necessary to form a uniform thin layer of toner on a toner support member.

As a method of forming this uniform thin layer.

The applicant previously filed Japanese Patent Application No. 53-92108 (4I
5-151673) was proposed.

The outline of this iJ4m device is explained with reference to Fig. 1.N/S magnetic poles N1/8l-N2/82/N are arranged along the circumference on the surface.
3.83t - A sleeve 100 (ner support member) made of non-magnetic stainless steel or the like is fitted onto the magnetized magnetic roll 101, and this sleeve 100 is fixed to the magnetic roll 101 and rotated around it in the clockwise direction in the figure. let A good magnetic blade 1 provided facing the cut pole Nl
02 cooperates with the magnetic force of the cut pole Nl to rotate the sleeve 100, and with the front plate (not shown *P, stay 104%) and the toner fall prevention stay 105, the insulating magnetic toner inside the container box is removed. °T is applied to an appropriate thickness on the sleeve 100. di is the magnetic blade 102 and the sleeve 1.
This is the clearance interval from 00. At the position of the nine toner Fi developing pole S1 applied to the sleeve 100 surface, the sleeve 1
00 and the holder td2 of the photosensitive drum D, a nine-microscopic image is obtained according to the electrostatic image.

In this case, the thickness of the toner applied to the own sleeve 100 is 50 to 1
00#, the width td2 of the developing section is 330μ or less and 100μ or more.

Next, the sleeve 100 continues to rotate, and the distance between the sleeve 100 and the toner cover prevention stay 105 gradually narrows until it becomes the narrowest at the bottom, and thereafter the sleeve 100 continues to move and move while maintaining that distance. Appropriately, this distance is @d3-1.3 to 2 m, where toner not used for development (residual toner) can easily enter. On the way, the point d4 becomes extremely narrow, which prevents the toner T from falling from above, especially when there is no toner inside at all, such as when using it for the first time, and prevents the toner from spilling out in the X direction when toner is dropped from above and replenished. In addition, it is better to provide a magnetic pole S2 at the surface position of the magnet roll 1010 in the sleeve corresponding to this d4.
Since the applied toner brush stands up in the area, the synergistic effect prevents toner falling from above from leaking. For the above-mentioned use, the narrower the distance d4 is, the better, but in reality, the distance d4 is such that the toner not used for development can easily pass through, that is, 0. T'~1.3m+li degree is appropriate.

After passing through the above distance d4, the toner on the sleeve 100 is cleaned off by a cleaner 106 made of a spring material such as phosphor bronze or stainless steel. Scraped Toner Tti
It passes through the hole 106m of the cleaner 106 in the Y direction. This force is due to the magnetic force of the magnetic pole N3 and the pushing force of the nine toners that are successively scraped off from below.

N2Fi magnet roll 101 has nine transport poles located at an intermediate position between magnetic poles S1 and 82, and S3 at an intermediate position between magnetic poles N3 and N1. Nine wires 108 are attached to the shaft 107.
rotates counterclockwise to agitate the toner T in the developing section 6 box.

The above-mentioned developing device has the photosensitive drum D and the sleeve 100 in the developing section (the part facing the drum D and the sleeve 1000) in the same direction at approximately the same circumferential speed, or more precisely, the sleeve circumferential speed is 2 to 3 to 11 degrees. The toner on the sleeve is statically moved to the latent image potential on the drum by setting it slower than the circumferential speed of the drum and making the sum of the moving speed of the tip of the applied toner brush and the increase in speed due to the rolling of the brush ears match the drum speed. To attract electrically.

Because of this configuration, as shown in Figure 1g2, the sleeve 10
Sleeve gear G8 is fixed coaxially with 0, and this gear GS
The photosensitive drum D is engaged with the drum gear GD coaxially disposed on the photosensitive drum D, so that the photosensitive drum D and the sleeve 1000 rotation speed are related to each other as described above.

To give a concrete example, the drum diameter is 160%.

The drum gear is 16011m, the sleeve diameter is 324%, and the sleeve gear has 33 teeth.

In this developing device, the brush for applying toner that is not formed on the surface of the sleeve 1000 does not come into contact with the photosensitive drum.
The toner T is electrostatically attracted to the potential of the latent image on the photosensitive drum D and moves within the distance d2.

Therefore, the rotational speed of the photosensitive drum D and the moving speed of the applied toner on the sleeve 100 must be made to completely match in the same direction, and must be configured so that rotational unevenness is maintained. Otherwise, the toner will move by the distance d2. During this time, the image becomes distorted. Therefore, the configuration in which the drum gear GD and sleeve gear GS are meshed with each other as described above can be said to be the best because it can completely prevent uneven rotation.

Even with the developing device configured as described above, when the process speed is high, for example, at 330 ml sec 9 degrees, the gap distance d1 between the toner application part and the sleeve 100 is 0.
If it is not about 1 or more, it may become somewhat unstable when applying toner with a thickness of about 50 to 100 μm. In cases where the interval between the toner passage areas is regulated in this way, or where the interval is relatively small, relatively large substances such as dust or aggregated toner may get stuck in the area.

If this phenomenon continues, subsequent toner application may become unstable, and toner may not be applied to the circumferential surface of the sleeve corresponding to the stuck area.When developing with such a sleeve, IA image unevenness or white spots may occur. This is undesirable because it causes problems.

In addition to the above-mentioned problems with the current gII device of this type, the present invention also solves the following problems: the bearing part of the rotating sleeve, the drive kb mechanism part, a sealing means for preventing toner leakage and scattering, a means for maintaining the distance between required gaps, In order to solve at least one or more problems regarding the device mounting means, bias application means, etc. during assembly and to obtain a comprehensively superior developing device, at least one or more new mechanical aspects of each part of the device have been introduced. Our aim is to provide products that have been created with the added ingenuity.

The following is a detailed explanation based on the same device as shown in the drawings. 111 example value position Ox uni plaid 1
It was configured so that it was not carried out with the 02 but with a coat sleeve.

That is, in FIGS. 3 and 4, bearings 1 and 2 are rotatably mounted between the rear side plate 5 and the front side plate 6 of the developing device case in the developing device case.
, 11-11, a parallel pair of developing sleeves serving as developer holding portions, and a coating sleeve for transferring toner, which is a developer, to the sleeves.

Both the developing sleeve 1 and the coating sleeve 2 are made of a non-magnetic material such as stainless steel, and each has magnet rolls 3 and 4 inserted therein as magnetic field generating members in the hollow space thereof. Both of the magnet rolls 3 and 4 do not rotate, and the sleeves 1 and 2 are rotated around the rolls in the direction of the hour hand as shown in Figure #I3.

On the built-in magnet roll 30 of the developing sleeve l, four magnetic poles Sa (coat pole), bNa (transport pole), %sb (@magnetic pole), and Nb (transport pole) are magnetized along the circumference as shown in the JIIa diagram. It is.

On the surface of the magnet roll 4 in the coat sleeve 2, there are also eight magnetic poles Nc a 8c at approximately equal intervals along the circumference.
m Nd e 8d @ Ne a 8e e Nf
m 8f is magnetized. The magnetic pole Nc serves as a cut pole and faces a non-magnetic blade 12 as a developer layer thickness regulating member, which will be described later. The magnetic pole Nd is located closest to the sleeve 2 as a coated pole. The other magnetic pole is the transport pole.

Court Three 7'll Makunetsu Troll 4's Court Kiwami N
d and the coated pole 8a ri of the developing sleeve side magnet roll 2 are roughly facing each other, but they are not directly facing each other, and the pole 8a is positioned slightly offset from the pole Nd by ft. be.

The developing device cylinder includes rear and front side plates 5-6 that bear the sleeves 1 and 2, a lower stayer having a concave bottom plate, an upper stayer 8 for holding the non-magnetic blade 12, and the upper stayer. It consists of a part of the upper surface cover extending from the upper surface of the stay 8 to the upper surface of the @# sleeve 1, and the wings 9, and each of these components (connected with each other with screws 13 etc. to form a single powder) It is assembled as a box. Fig. 5 shows an oblique view of the assembled vessel. The earthen floor cover member 9 is installed after the necessary parts have been assembled into the vessel.

An opening 8a is formed on the upper surface of the upper stay 8, and the front side is bent diagonally downward, and a non-magnetic blade 12 (screwed 12) made of aluminum or the like is attached to the bent portion 8b.
Step 1 is installation. The opening 8a is always closed due to the attachment of the upper cover part 9, and when the upper cover part is removed, the opening 8a can be used to perform maintenance inside the developing device.

The toner T is placed approximately on the left half of the lower stayer, on the upper stay 8° non-magnetic blade 12. :I-) The toner storage portion is accommodated in the space within the six boxes surrounded by the substantially left half circumferential surface of the sleeve 2 and the side plates 5 and 6.

Reference numeral 61 (Figs. 4 and 5) denotes a toner sequential supply chamber for replenishing the toner storage section in the cylinder, which is integrally formed on the outward side of the front plate 6, and is formed on the end wall of this supply chamber. A toner delivery screw shaft 14 is disposed between the back side plate 5 of the developing device and the toner delivery screw shaft 14 with bearings 15 and 15 under its own rotational weight. The pick-up screw portion 141 is not formed over the entire length of the shaft 14, and is not formed over the entire length of the shaft 14.
1. Only the inner shaft portion is formed. Then, replenishment toner was stored in the upper opening 61M (striped figure 5) of the chamber 61! ! The used toner return pipe is connected to the mouth of the container, the container connecting pipe, and the copying machine cleaner part, but it may be omitted from the figure.

When both the developing sleeve 1 and the coat sleeve 2 are rotationally driven in the direction of the hour hand indicated by the arrow in FIG. is coated on 12 portions of the non-magnetic blade to an appropriate thickness. Next, at the closest facing portion between the coat sleeve 2 and the developing sleeve 1, the coat sleeve 2 is removed.
A thin layer of toner is applied to one surface of the developing sleeve.

The surface of the developing sleeve, on which a thin layer of toner has been applied, rotates to a position facing the photosensitive drum D, and selectively jumps in places corresponding to the latent image pattern on the surface of the drum D@hetrum to form a latent image. Visualization is done.

As the sleeve 1 continues to rotate, the toner on the developing sleeve 1 that was not used for development returns to the part facing the sleeve 2 and mixes appropriately with the new toner in the coat sleeve 2 layer. Shiai.

Alternatively, after being scraped off, a fresh thin layer of toner is uniformly applied to each part of the ms sleeve again, and the thin layer of toner is rotated again to the developing section, and is seen through the cycle. Continuous development of the latent image on the 9th surface of the drum is completed.

The gap between the coat sleeve 2 and the non-magnetic blade 12 is da, the gap between the coat sleeve 2 and the developing sleeve l is the closest to each other, db is the gap between the developing sleeve l and the photosensitive drum D, where the opposite is closest to each other. If dc is, for example, dawO,8-.

db W L OW+, coat magnetic pole Nd = 1000 gauss, same 8m = 800 gauss, coat sleeve 2
A single layer of toner with a thickness of approximately 0.9 yn is applied to the surface, and a thin and uniform layer of toner approximately 60 μm thick is applied to the surface of the developing sleeve 1. dc is set to about 0.1 to G and 3 rm.

The toner T in the toner storage section gradually decreases as it is consumed,
Toner is sequentially delivered from the supply w161 side by rotation of the toner delivery screw shaft 140 and replenished.

If a thin layer of toner is formed on the developing sleeve 1 using the coat sleeve 2 as in the above example, the spacing between the above parts will be smaller than when forming the thin toner layer on the developing sleeve 1 directly using the blade 102 as in the apparatus shown in FIG. Even if e db is set to a large value, a thin and uniform toner layer can always be formed on the surface of the developing sleeve 1 in a stable manner even at high process speeds. Problems with poor toner application due to stuck toner, such as dust and agglomerated toner, are greatly reduced.

(2) Structure to prevent toner from scattering outside the container box due to the rotational drive of sleeves 1 and 2 (Figure W43) Sleeve 1-2 has a part of the applied toner on its surface due to the centrifugal force caused by the rotational drive. Toner scattering is observed due to large and small particles coming off. In this case, the coated toner layer on the image sleeve 1 side is formed by transferring the toner having sufficient tribo on the coat sleeve 2 side, so even if the sleeve rotation is considerably fast (i.e., the process speed is considerably high) Even when used in a multifunction device, there is little toner separation and scattering due to the rotational centrifugal force of the sleeve, but on the coated sleeve 2 side, the coated toner is thicker and brush-like, and there is toner that does not have tribo. Therefore, toner separation and scattering is likely to occur.

Therefore, in order to prevent the separated toner from scattering outside the barrel of the device of this example V, - the top cover member 9 is used to cover the upper part of the coat sleeve 2 and the developing sleeve l, and the cover member is further The leading edge of No. 9 was made to extend sufficiently to a point close to the drum D.

In addition, the scattered toner generated around the coat sleeve 2 is carried by the rotating wind caused by the rotation of the coat sleeve 2 and the developing sleeve 1, and enters the space passage between the back surface of the upper cover member 9 and the upper surface side of the sleeves 2 and 1. through f as shown by the chain line arrow Tal+
In order to prevent the AgII device from coming out of the container through the gap between both box openings and the developing sleeve 1, the facing portion of the coat sleeve 2 and the developing sleeve 1 is placed in the middle of the space passage. A plate-shaped fin (baffle plate) 16 that divides the space passage into left and right sides at the boundary is attached and supported at the upper side to the back surface of the upper cover member 9, and the lower side extends to the vicinity of the opposing part of the coat sleeve 2 and the developing sleeve 1. It was extended and installed.

That is, due to the presence of the above-mentioned fins 16 as an obstruction member, the scattered toner wind generated around the coat sleeve 2 and riding on the sleeve rotation wind is obstructed by the fin 16 surface on the way and is weakened or disturbed. Therefore, the scattered toner is collected on the fin surface, and almost all leakage and scattering outside the cylinder is prevented.

The lower side of the fin 16 may be close to either the sleeve 1 or 2, or a plurality of fins may be provided along the above-mentioned space passage. We also attempted a design that narrowed the space passage between the sleeve rotation wind and the toner flow, but it was found that the scattered toner wind riding on the rotational wind of the sleeve passed through the narrow space passage relatively easily, causing leakage and scattering to the outside of the cylinder. The effect of preventing toner leakage and scattering is F/16.
It was worse than if I had set it up.

In addition, the scattered toner wind carried by the rotational wind of the sleeve tends to be drawn out of the container even through the gap between the two ends of the developing sleeve l and the inner surface of the container side plate 5@6. .

Therefore, in the apparatus of this example, the back side of the upper cover member 9 is rounded to close the gap and prevent the toner from scattering outside the cylinder. Insert a downwardly directed elongated piece 17 into the gap in the radial direction of the end face of the developing sleeve at a position corresponding to the gap between the end face of both ends of the sleeve 10 and the side plates 5 and 6 of the cylinder on the other side. An elongated cushioning sealing material 18 made of maltbrene or the like was affixed and supported on the elongated piece 17 to close the gap without interfering with the sleeve's 10 rotations. The above-mentioned sealing material such as maltbrene 18 may be inserted in the form of a circular shape that is larger in rotation than the end surface of the developing sleeve l, instead of being an elongated strip piece, but when assembling the developing sleeve l into the container cylinder, it is necessary to press and shrink it while assembling it. Since this is a little troublesome, in this example apparatus, a strip-shaped piece is provided as described above.

With the treatment configuration described above, toner scattering outside the cylinder due to rotational driving of the sleeve hardly occurs, and it can be applied even to extremely high-speed copying machines.

(3) Bearings of sleeves l and 2 (Figures 4 and 8) Bearings 10 and 1 at both ends of developing sleeve l and coat sleeve 2
0, '11 @ 11, when toner enters the inside thereof, the rotational performance as a shaft bearing decreases due to condensation of the toner, and the drive of sleep l and 2 is impaired. Ball bearings in q# are prone to toner intrusion.

Even if the inner side of the fA imaging device of the bearing is closed off with an oil seal, for example, in this type of developing device, during operation, toner on the circumferential surface of the sleeve L and 20, and toner in the toner storage portion toward the end of the sleeve. The force applied to the bearing is quite strong, so over a long period of time, toner can pass through the oil seal and enter the bearing.

Therefore, the device of this example is designed to strictly prevent toner from entering the bearing and maintain stable rotation of the sleeve over a long period of time.

First, the 3Jl image sleeve 1 and the internal magnet roll 3 are integrated into one unit in the following manner. That is, the end opening on the back side of the developing sleeve l has a relatively long solid shaft 191 formed at the center of the outer surface, and a bearing 19 formed in the recess at the center of the inner surface.
It is closed by fitting the end plate (7-lunge disc) 19 into which 2 is fitted and held and joined together. The magnet roll 3 is integrally connected to the central shaft 20, and the protruding length of the real end 201 of the shaft 2° is short, and the protruding length of the near side end 202 is relatively long. . Then, the magnet roll 3 is inserted from the opening at the front end of the developing sleeve 10, and the back shaft part 201 of the magnet roll 3 is fitted and held in the bearing 192 at the center of the inner end plate 19 of the lump moat sleeve 1V. A comparatively long cylindrical shaft 211 is formed in the center of the outer surface in a zero order state, and the end plate 21 with the bearing 212 fitted and held in the recess in the center of the inner surface is placed in the cylindrical shaft 211 with a magnet roll. Insert the front side shaft 202 of No. 3.

In addition, the base of the shaft is connected to a bearing 212 at the center of the inner surface of the end plate 21.
and fit into the opening on the front side of the developing sleeve l to be integrally connected. That is, the magnet roll 3 is sealed and built into the developing sleeve 1 by end plates 19 and 21 on the back side and the front side, and the ms sleeve 1 has bearings 192 centered around shafts 201 and 202 at both ends of the magnet roll 3.
・212, the whole unit is made into a unit with a structure that can rotate freely through the end plates 19 and 21.

The coat sleeve 2 also has the same structure as described above, and is integrated into one unit with the internal magnet roll 4.

That is, 22 is the back end plate of the coat sleeve 2.

221 is a solid shaft at the center of the outer and inner end plates, 222 is a bearing fitted and held in a recess at the center of the inner surface, and 23 is a central shaft of the magnet roll 4, with which the magnet roll 4 is integrated. Reference numerals 231 and 232 indicate projecting portions on both roll ends of the shaft, 24 indicates a front end plate, 241 indicates a shaft at the center of the outer surface of the end plate, and 242 indicates a bearing fitted and held in a recess at the center of the inner surface.

Hereinafter, when the term "developing sleeve unit" is used, it means an assembled structure of the top V, the developing sleeve 1, and the magnet roll 3 as one unit, and when the term ``coat sleeve unit'' is used, the same applies to the above-mentioned coat sleeve 2. and the assembled structure of the magnet roll 4 as one unit.

The developing sleeve unit has protruding shafts 191 and 2 on both ends thereof.
The base portions of 11 are rotatably supported between the rear side plate 5 and front side plate 6 of the developing device cylinder via bearings 10 and 10, respectively. Similarly, for the coat sleeve unit, the protruding shafts 221 and 241 on both ends thereof are rotatably supported in the support 11 between the back side plate 5 and front side plate 6 of the developing device barrel via bearings 11 and 11, respectively. Ninth, the following bearing structure is used to strictly prevent toner intrusion over a long period of time. That is, each bearing lO.10% 11, 11 is held in a resin cylindrical casing 111 by inosert, and an oil seal 112 is installed in the opening of each casing on the inside of the powder box of the developing device. Make it into an inset form. Then, the bearings and oil seal built-in cage/gAg 111 are held on the back side plate 5 and front side plate 6 of the developing device barrel, and the built-in bearings 10, 11, and 11 are attached to the shafts on both ends of the gAg11 sleeve unit. The shafts 221-241 on both ends of the 191/2111 coat sleeve unit are supported,
Annular grooves 193, 213, 223, 243 are formed concentrically with the shafts 191, 211, 221, 241 on the outer surfaces of the first and I'2 end plates 19, 21, 22, 24 of the 111 sleeve unit and the coat sleeve unit. The inner end of the bearing casing 111 with built-in Q bearing and oil seal is inserted into each of the annular grooves.

That is, if the bearing configuration is as described above, each bearing 10-.1
0% 11111 is due to the presence of the cylindrical casing 111 and the oil seal 112), which prevents direct toner from being covered with toner. Since the annular grooves 193, 213, 223, and 243 are formed in the outer edges of the side end plates 19, 21, 22, and 24, the toner is prevented from going around to the inner end surface of the casing 111. Even if there is rotation, the amount is small and the toner working pressure on the oil seal 112 is small. Therefore, the phenomenon that the toner passes through the oil seal and enters the casing and acts on the bearings 10@10.11 and 11 is eliminated. The trouble of toner entering into the 10 fist 1O111-11 is strictly prevented for a long period of time. The single-bearing-intrusion structure also has the effect of reducing the size of the entire intrusion-expression imaging device.

On the other hand, the toner Ill in the toner storage section is stored in the gap between the back end plate 22 of the coat sleeve unit and the container center plate 5, and the gap between the front end plate 24 and the S box front plate 6. The toner protrudes through the toner to the developing sleeve unit side, and the toner scatters or is caught by the developing sleeve l or coat sleeve 2, causing the toner thickness on the sleeve l to become uneven or mottled. In order to prevent this, the device of this example closes the gap by intervening a disc-shaped cool material 25 made of Kusshigo wood from Maltblane township in the gap. In this case, the sealing material 25 is used to prevent the seals @ 25 and 250 from being worn out due to sliding between the back end plate 22 and the front end plate 24 and the sealing materials 25 and 25 when the coat sleeve 2 is driven to rotate.・End of 25 [22・2
On the fourth side surface, low friction thrust sheets 251, 251 made of polyethylene resin and polyacetylene resin are placed on top of each other.

By interposing the sealing materials 25, 25 in this manner, the above-mentioned toner protrusion and related troubles are prevented, and the bearing casings 111 at both ends of the coat sleeve unit are prevented from being covered with toner.
The trouble of toner intrusion into the bearings 11 is more effectively prevented.

In most cases, the iA&sleeve unit and the coat sleep unit are assembled into the developing device container box in most cases, but it is better to have a configuration in which they can be inserted and removed freely for installation, maintenance, etc.

Figure 9 shows the configuration of the conventional removable and removable assembly 4, so the back side plate 5 of the developing device Zenpo (Figure 9 (a)
)) and the front plate 6 ((b)) into which the bearing members of the developing sleeve unit and the coat sleeve unit are fitted, respectively.
Through holes 1, b, 1' and b' are formed for each piece, and the back side plate 5
For this, a slit hole C is formed by notching the edge of the plate 5 at the edge of the plate 5, and a slit hole d is formed which communicates with the hole a and bt. The dimensions of the slit holes C and d(1)8 are set to width dimensions through which the rear shafts W6191 and 221 of the developing sleeve unit and the coat sleeve unit can pass.

First, the front shaft portion 241 of the coat sleeve unit is inserted into the through hole b' of the front side plate 6 in the current gII device barrel assembled using the side plates 5 and 6 as described above.
Insert it from the inside of the side plate and make it protrude to the outside of the side plate,
Next, the back shaft portion 221 is placed in correspondence with the slit hole C at the edge of the center side plate 5 of the vessel cylinder, and is positioned in the hole by passing through the slit hole C → through hole a → connecting slit through hole d. . The externally fitted bearing members are protruded from the through holes b-b' to the outside of the side plates 5 and 6, respectively, and fitted onto the shaft portions 221 and 241 at both ends of the nine-coat sleeve unit, respectively. It is fitted into the through holes b and b' to prevent it from coming out. As a result, the side plates 5 and 6 on the back and front sides of one box of coat sleeve units
The assembly is in a state where it can rotate freely through a bearing in between.

Next, the developing sleeve 5. Insert the front shaft part 211 of the knit into the through hole a/ of the front side plate 6 of the machine box from the inside of the side plate to protrude to the outside of the side plate, and then insert the back shaft part 191
is made to correspond to the slit through hole C of the back side plate 5 of the powder box, and is passed through the passage C to be located at the through hole. Through hole 1・a
Bearing members are externally fitted onto the shaft portions 191 and 211 at both ends of the developing sleeve unit protruding from the side plates 5 and 6 from ′, respectively.
The externally fitting bearing members are fitted into the through holes 1 and 1' of the side plates 5 and 6, respectively, to prevent them from coming off. As a result, the developing sleeve unit is freely rotatably assembled between the rear and front side plates 5 and 6 of the six boxes via the bearing member.

After the above-mentioned two sleep units are assembled, blind plates are attached to the connecting slit hole d that connects the through hole d of the back side plate 5 and the slit hole C of the through hole 1 as necessary.
The procedure for assembling and removing the sleeve unit is the reverse of the above procedure.

However, the above assembly has the following problems.

1 As for the back side plate 5, the plate surface has slit through hole C, through hole a11, connecting slit through hole d, as shown in WN2 diagram (a).
There is a problem in terms of strength because a series of through holes form a deep cut. Especially when a coat sleeve unit and a developing sleeve unit are installed, the weight of both units and the magnetic attraction force between the built-in magnet rolls of both units create the deep cut c - a - d.
The upper and lower parts of the back side plate 5 bordering on -b are slightly opened around the through hole, and as a result, the assembly of both sleeve units is difficult due to the predetermined clearance interval db of the rain unit. do not have.

I. Connecting slit) When closing the through hole d or the slit through hole C, simply placing a blind plate against it and tightening screws will not completely close the seal, and the toner in the percent cylinder will leak between the blind plate and the side plate. Since it leaks from the small gap between 111 and 5, some ingenuity is required to remove it.

In addition, in the case of fQ, as shown in Fig. 9(C), the through holes 1 and b of the back side plate 5 are not communicated through the communication slit hole d as shown in the same figure (!I), and the sleeve for both through holes and b is Unlike the configuration shown in Fig. wi9 (a), the reduction in strength of the plate 50 is eliminated by providing a slit through hole d/ for the unit shaft fitting inside the dormitory, and the assembly of both sleeve units is The appointed time 1! The lt interval db is also easy to produce. However, there are some difficulties in how to attach the wrinkled board 5 and the lower stayer to each other, and in how to close the slit hole d' formed at the bottom.

Therefore, in this example device, the developing sleeve unit and coat sleeve unit 3 are devised to avoid the above-mentioned problems when incorporated into the imaging device.
This will be explained with reference to FIGS. 5 to 8. That is, as shown in Figure 6 (1), 6
Regarding the back side plate 5 of the box, each back side bearing part side of the developing sleeve unit and coat sleeve unit (in this example, the bearing lO
11 and oil seal 112 are inserted to form two through holes 5a and 5b into which the nine-cylindrical cage/gage 111 (hereinafter referred to as bearing member 111) is fitted, and a part of the edge of plate 5 is formed. A slit through hole 5C communicating with the through hole 51 is formed by cutting it out. In the slit hole d that communicates with the hole 5bFi (FIG. 9, 6), a slit hole d' as shown in FIG. 9(C) is not formed, but an isolated hole is formed. Regarding the front side plate 6, as shown in Figure 6 o-1), there is a through hole 6m into which the front side bearing member itt of the developing sleeve unit is fitted, and a hole 6m with a medium-large diameter that is slightly larger than the outer diameter of the sleeve 2 of the coat sleeve unit. A through hole 6b is formed.

Regarding the developing device box (Fig. 5), which is assembled using a nine-confucian board that has undergone the perforation process as described in section h, first, the area around the through hole 5b on the inner surface of the back side plate 5 of the powder box is As described in item (3) above, the pasting material of the disc-shaped cushioning sealing material 25 and the thrust sheet 25Z is pasted in advance.Next, as shown in Figure 7, the front end of the coat sleeve unit is attached to the machine case. By inserting the large penetration hole 6bK of the front side plate 6 from the inside of the side plate and protruding an appropriate length to the outer surface of the wrinkled side plate 6, the inner shaft portion 221 of the coat sleeve unit is inserted.
6. Next, position the shaft part 221 in the through hole 5b of the container side 4 [5, and insert the coat sleeve unit into the back side plate until the back end plate 19 reaches the thrust sheet 251. By pulling the cough coat sleeve unit in five directions, the back shaft portion 221 of the cough coat sleeve unit is made to protrude outward from the through hole 5b of the back side plate 5 (Fig. 8). The member 111 is fitted externally, and the externally fitted bearing member 111 is fitted into the through hole 5b of the back side plate 50. On the other hand, a disc-shaped lid 11'62 that fits into the large-diameter through-hole 6b is attached to the front-side shaft portion 241 of the coat sleeve unit, which is located in the center extending outward from the large-diameter through-hole 6b of the front plate 60. Fit into the center part and fit the round bearing member I'llt outward. A bonding material of the disk-shaped cushioning sealing material 25 and the thrust sheet 251 is applied to the inner surface of the lid plate 62 in advance. Then, the lid plate 62 fitted with the bearing member 111 is fitted into the large diameter through hole 6b of the front side plate 6. The bearing member 111 is fitted into the through hole 5b of the back side plate 5 and the large diameter through hole 6b of the front side plate 60 to prevent the cover plate 62 from coming out by appropriate means. This allows the coat sleeve unit to be attached to the rear and front side panels 5 of the 6 boxes.
・It is assembled freely to rotate through the bearing 11Φ11 between 6 and 6.

Next, the front shaft 52 of the developing sleeve unit
11 into the through hole 6 of the front side plate 6 of the powder box from the inside of the mosquito side plate so that it protrudes to the outside of the side plate (Fig. 8), and then insert the back shaft part 191 into the slit through hole 5C at the edge of the back side plate 5. It is made to correspond to the slit through-hole 5C1-, and is made to pass through it and is located in the through-hole 5a. Both end shaft portions 191 and 2 of the developing sleeve unit protrude from the through holes 5a and 6a to the outside of the side plates 5 and 6.
The bearing members 111 and 111 are externally fitted onto each of the bearing members 111 and 111, and then the externally fitted bearing members 111 and 111 are secured to the side plates 5 and 60 through the through holes 5a and 6aK, respectively, to prevent them from coming off.

As a result, the developing sleeve unit is freely rotatably assembled between the rear and front side plates 5 and 6 of the six boxes via the bearings 10 and 10.

That is, the developing device of this example is a developing sleeve unit.

Since the coat sleeve unit is assembled into the existing equipment barrel using the above-described configuration, the predetermined gap dbt between both sleeve units can be maintained to ensure sufficient strength of the side plates.
It is easy to take out, and the distance between them is maintained stably over a long period of time. 1) Assembling and removing are the reverse steps of the above assembly. There are advantages such as good performance and no toner leakage, and all of the above-mentioned problems are solved.

The effect of preventing toner leakage is explained in detail in Fig. 9(a).
It is extremely difficult to close the slit-shaped openings d and d' to prevent toner leakage in the side plate 5 having the configuration shown in FIGS. If the fitting length is set aside by 2 to 3%, toner leakage will not occur.
In the developing device of Shimamoto's example, which prevents toner from leaking into the developing sleeve unit from the gap space between the side plates 5 and 6 of the cylinder, the gap space is sealed with Moldove V/(Seal @) 25. In the side plate configuration shown in FIG.
c) The length of the diagonal line, ie, the length Ll shown in FIG. 8, is required, and the space that must be filled with maltbrene 25, which is the sealing material, becomes large.

My father, I had to set the coat sleeve unit with the Moltoprene 2 folded down, and after repeatedly inserting and removing the coat sleeve unit, the Moltoprene 2
In the case where the coat sleeve unit is set as shown in Figures 7 and 8, in which case 5 is easily peeled off and the thrust sheet 251 is damaged, it is not necessary to shrink the maltbren 25 and then set it. is also easy.

(5) Installation of screw shaft, blade, etc. (3rd
(Fig. 4) After assembling the developing sleeve unit and the coat sleeve unit into the developing device barrel as described in the previous section, the toner delivery screw shaft 14 is rotatably supported by bearings 15 and assembled into the developing device barrel. In addition, the non-magnetic plate 12 and the scoop member 2626 are secured to the diagonally downward bent portion 8b of the upper stay by aligning them with screws 121 and 121. In this case, the blade 12 has a predetermined clearance dimension d between its lower side and the coat sleeve 2.
Position the lid so that a is formed and tighten the screws. The scooping members 26, 26 are toner scraping plates disposed with their tip sides lightly touching or close to both ends of the coat sleeve 20, and will be explained in a separate section (section (7)).

Assembling the above required parts into the container will be done later.

The plate-shaped fin 16 described in the above (2) is provided on the back side. The upper cover member 9 with the elongated sealing material 18 attached is placed over the top of the four boxes and screwed onto the upper stay 8.

Further, regarding the developing sleeve unit, bearings 27 are provided on the shaft portion 191 that protrudes outward from the back side plate 5 of the six boxes, and the cylindrical shaft 211 that protrudes outward from the front side plate 6 of the box.
1 and 271, the spacer rollers 27-27 are rotatably mounted and supported. The spacer rollers 27 come into contact with both ends of the photosensitive drum D to maintain the gap dc between the developing sleeve 1 and the drum D at a predetermined value at all times.

In addition, in the so-called Jambi/G development like the developing device of this example, the spacer roller 2762 is rotated for one rotation of the developing sleeve 1.
7 also rotates once, so bearings 271 and 271 in the inner part of the roller
In other words, the spacer rollers 27, 27 may be press-fitted into the shaft portions 191, 211 of the developing sleeve unit and integrated with the shaft. The material of the spacer rollers 27 is preferably soft resin, such as polyethylene, so as not to damage the photosensitive drum D.

(6) Drive mechanism for developing sleeve, etc. (4th, 10th to 1st
Figure 3) It is best to keep the developing sleeve 1, etc. closed unless necessary, but as shown in the device in Figures 1 and 2, the sleeve gear G8
In the configuration in which the sleeve 1004 is driven by engaging with the drum gear GD, the sleeve 1004 always rotates while the drum D is rotating. For this reason, single-component toner with a small tribo is likely to fall off and scatter from the sleeve surface, increasing the amount of toner scattered into the machine.

In a copying machine that measures the charged state of drum D and automatically controls the potential, toner adheres to that area and is consumed or scattered when measuring the potential of a peta black, so it is important to save resources. I also don't like it.

Therefore, the current I# of this example! The apparatus is configured to be able to turn on/off the rotational drive of the developing sleeve, etc. of the developing device in response to signals from the copying machine control system.

That is, the developing sleeve unit and coat sleeve unit re-magnet roller shafts 20 and 23 have the tips of the protruding shafts 202 and 232 on the near side connected to the cylindrical shafts 211 and 232 of the front end plates 21 and 24 of each unit, respectively, as shown in the fourth figure. 241 protrudes outward from the tip, and a part of the circumferential surface of each of the outwardly protruding shaft portions is machined into flat rM203 and 233.

and.

There is a bearing ring 281 at the lower end of each machined shaft.
Bearing ring 2 for support plates 28 and 29 with 291 caulked
81 and 291, and screw the bearing ring 0 set screw 282.
292 and press the lower ends of the push screws against the machined flat surfaces 203 and 233 of the shafts, respectively.
233 and bearing/g 281 @ 291 i.e. support plate 28-29
are integrally connected, and the upper ends of each support plate 28 and 29 are formed into downward folding pieces 91 and 91, which are formed in series at the bottom edge of the upper surface of the container @ 90, respectively, as shown in FIG. screw 283
・It is firmly fixed with 293.

Therefore, each of the magnet roller shafts 20 and 23 of the developing sleeve unit and the coat sleeve unit, that is, each of the magnet rollers 3 and 4ri, is held fixed (non-rotating).

On the other hand, electromagnetic springs are attached to the outwardly protruding shaft portions of the rear side plate 5 of the six-box sleeve unit, coat sleeve unit, and screw shaft 14, respectively.

Coat sleeve gear G4. The screw shaft gear G5 is fixed.

The electromagnetic spring clutch unit C/ includes a clutch shaft 30, an electromagnetic part 31 attached to one end thereof, a transmission gear G2 which is press-fitted into the other end and integrated with the shaft 30, and the electromagnetic part 31 and transmission gear G2. A developing sleeve gear Gl is loosely fitted onto the shaft 30 between the clutch shaft 30 and the tip end of the clutch shaft 30 on the transmission gear G3 side is connected to the center side plate 5 of the IAg II sleeve unit.
The gear G2 is integrally and rotatably connected to the pin 32 by inserting it into the tip of the outwardly protruding shaft 191. Also, the electromagnetic part 31
It is held in place by the center side plate 5 of the container box via a plumket 33 and a set screw 34.

The developing sleeve gear G1ri is engaged with the drum gear GDIC that rotationally drives the drum D, and the transmission gear G2 is engaged with the coat sleeve gear G4 via the idler gear G3. The coat sleeve gear G4 and the screw shaft gear G5 are directly meshed with each other (FIGS. 11 to 13).

In the CI, when the electromagnetic section 31 is energized from the control system of the copying machine, the clutch plate 311 moves in the direction of the developing sleeve gear G1 and is engaged, and then the clutch plate 311 moves in the direction of the developing sleeve gear G1 and is held in place. It becomes an integrated state (clutch-on). On the other hand, when the power supply is cut off, the clutch plate 311 escapes from the gear 01 side, the engagement is released, and the gear Gl becomes free to rotate with respect to the clutch shaft 30 (clutch-off).

Therefore, when the clutch is off, even if the yA image sleeve gear G1 is rotated as the drum gear GD rotates, the gear 0 is
1 causes the clutch shaft 30 to idle, no rotational force is transmitted to the shaft 3°, and neither the tosleep 2 nor the screw shaft 14 in gears 02 and below at G51 are rotationally driven.

When the clutch is on, the developing sleeve gear G1 and the 2'' shaft 30 are connected and integrated, so the rotation of the drum gear GD causes the gear G1, clutch shaft 3o, transmission gear G2, and shaft 191 to be connected.
rotate together, and the fJL image slide sleeve unit sleeve 1 becomes in a rotationally driven state.

The direction of rotation is the direction of the upper hour hand in FIG.

The rotation of the transmission gear G2 is also transmitted to the coat sleeve gear G4 via the idler gear G3, the coat sleeve unit shaft 221 is rotationally driven, and the coat sleeve 2 rotates in the same clockwise direction as the developing sleeve 1.

Further, since the screw shaft gear G5 is engaged with the coat sleeve gear G4, the screw shaft 14 is driven to rotate counterclockwise, and the appropriate amount of toner is sequentially supplied from the replenishment toner supply chamber 61 to the toner storage section of the cartridge. Replenishment will be provided.

Here, since Mokuoka's IAm device is of a so-called jumping developing type, the circumferential speed of the photosensitive drum D is greater than the outer diameter of the developing sleeve 1 da (drum D and developing sleeve 1).
(0 gap) The circumferential speed is completely consistent with the circumferential speed at the 9th point apart. To give specific figures, the outer diameter of the developing sleeve l is 324%;
Drum D and 3ilt image sleeve It) Distance d c =
0.3%, drum DO diameter 160%, dohum gear GD number of teeth 160, fJL image slip sleeve gear G11i number of teeth 33. With this value, the apparent circumferential speed of the developing sleeve 1 has a ratio of 0.98 to the circumferential speed of the drum D, but this ratio becomes 1 at a distance of 0.3% from the surface of the developing sleeve L. .

The circumferential speed of the coat sleeve 2 is set to the toner separation layer (50 to 100
It would be nice if we could supply enough toner to form
It may be around 259b of the circumferential speed of the image sleeve 1, but the toner will be transferred between the area on the developing sleeve 1 where the toner is used up and the area where the toner remains and the area used for development. In order to reduce the difference in condition, it is necessary to use the action of brushing the toner on the developing sleeve 1 with the toner brush on the coat sleeve 2, that is, the action of magnetic plan development, and preferably the circumferential speed is about 75 m. Yes, of course it's fine if it's faster, for example at the same circumferential speed, but
The single-component toner used in the +3A imaging method has weak tribo and forms a nearly 1% long brush on the coat sleeve 2, which is easily scattered when rotated at high speed, and the difference in the toner coverage mentioned above can be virtually ignored. It is preferable to rotate at a slow speed. This rotational speed was approximately 50 to 1001, depending on the amount of tribo and the circumferential speed of the developing sleeve.

In the developing device of this example, the developing three has a ratio of gear 01 and transmission gear G2 of approximately 1':0.75, specifically rcFin teeth and 2.
The above peripheral speed is achieved with 5 teeth.

The clutch C/ is an example of an electromagnetic spring clutch, but if the diameter of the clutch Ct is large, there is a space that gets in the way, so an electromagnetic spring clutch that is dust free and capable of transmitting high torque is suitable.

As mentioned above, the clutch unit C/ is connected to the developing sleeve unit by fitting the shafts 30 and 191 together with the pin 3.
If you connect it with 2, you can assemble it in a very easy way.

With the above drive system configuration, the p'iA image device can be freely driven and stopped. Furthermore, the two sleeves 1@2 can be driven at appropriate rotational speeds using an extremely simple drive system.

Same, ts4@13 35 in the figure is drum gear GD and drum D
The connecting pin is shown engaging the side plate DI of the figure.

(7) Toner scooping member (Figures 4 and 4A) Regarding the coat sleeve unit, the end plates 2 at both ends of the coat sleeve 20
2-24 is inserted into the circumferential surface area L2/L2Fi where there is no magnetic roll 4, so it holds the toner) J is weak, so there is no magnetic roll 4 inside.
As a result, the toner behavior is different when the developing sleeve l develops the drum D. Specifically, the toner behavior is different for the same drum D @ v latent image potential. The density is developed.

Since the magnetic force to attract toner is weak, toner tends to scatter in this area when the coat sleeve rotates 20 times, and the thickness of the toner transferred onto the 3J image sleeve l is thicker than in the center. This tendency causes various inconveniences when carrying out the accidental development. If this occurs, the toner is crushed between the drum D and the developing sleeve 10, and a layer of dense toner is formed on the drum. In addition, even in the circumferential area where the magnet roll 4 is located inside, the edge thereof, that is,
In the region L3 in FIG. 4, the magnetic force is strong in that part due to the nature of the magnet. Therefore, if a non-magnetic material is used as the blade 12, which is not implemented due to the internal magnet robustness or uneven characteristics, the behavior of the toner will be greatly affected in the longitudinal center area of the circumferential surface of the coat sleeve 2 and this area L3. Although there is little difference, when a magnetic material such as iron is used for the blade 12, a toner layer that is considerably thicker is formed in this portion than in the central portion.

Therefore, the 4-nig developing device has been designed to solve the above-mentioned problems. That is, one magnet roll 3 in the developing sleeve 1 is made so that it is slightly longer than the largest copy paper medium LP.
The length L5 of the magnet roll 4 in the coat sleeve 2 is further set to be slightly longer than the length L5. Furthermore.

Coat sleeve 2tZ) A rake member 26 that makes light contact with the horse surface areas L2 and L2 at both ends, or is spaced from about 0 to 0.5% and matches the end surface of the magnet roll 4 inside the sleeve 2, or slightly enters inside.・26 will be provided.

With this configuration, due to the presence of the scoops faH24 and 26 on both ends of the coat sleeve 2o, no toner layer is formed or an extremely thin layer is formed, and the sleeve surface between them is completely filled with only toner having the same properties as tribo. As a result, a uniform thin layer is formed on the developing sleeve l, and therefore, when jumping development is performed, the vm image also reaches the maximum paper LP.
Good over the entire range. Also scooping member 26, 26
Therefore, the toner pushed from the rear along the curved areas L2 and L2 where the magnet roll 4 does not exist inside both ends of the coat sleeve 2 does not spill out to the both ends of the sleeve 2.

t4 In the example in FIG. 4, the above toner scooping member 261126
and the blade 12 as separate members, and the assembled VC
However, as shown in FIG. 4A, the front edges of both ends of the blade 120 are made into projecting edges. The toner scooping members 26 and 26 parts may be configured as described above.

(8) Applying bias to the developing sleeve etc.
(Fig. 4.10, 12.13) It is known to apply an alternating current bias with a superimposed direct current to the developing sleeve 1 in order to improve the developing performance, especially the gradation and the li image density using a one-component developer. . However, ii
As the speed of image formation increases, the level of the applied direct current and alternating current and the frequency of the alternating current must be increased accordingly, and the bias applied will no longer produce a scanning effect. Specifically, when the process speed is 120%, the appropriate ik is set to DC molecule aoov, alternating current 500V, and AC frequency 200 Hz.
I image was obtained, but when the process speed is 330%, direct a minute + 6 s o, exchange rate ± 1ooov, AC frequency 550 H2 is required, but when such a high potential bias is applied. To prevent leaks, each part of the device must be made of electrically insulating resin, and creepage distances must be maintained.

In particular, it is necessary to avoid applying bias to the side plates 5 and 6 and the lower stayer that constitute the developing device barrel.

This is because when the toner inside the Fia imager comes into contact with the biased wall surface of the base box, the above-mentioned tribo occurs.
This is because the toner may be deteriorated.

Furthermore, since a high potential bias is applied to the developing sleeve 1, the electromagnetic clutch Cl must have a withstand voltage of about 2000 V or the clutch coil may suffer from poor insulation.

In addition, such a high-voltage electromagnetic clutch CI is not normally commercially available, and has drawbacks such as being extremely expensive and large, and being difficult to manufacture that conforms to the standards of various electrical appliances.

In view of the above, the developing device of this example has a bias application configuration modified.

That is, the rear side [5, front side plate 6, and lower stayer] of the developing device barrel are made of an insulating material such as resin, and the developing sleeve unit, coat sleeve unit, blade 12. The screw shaft 14+/) parts are kept insulated from each other. Similarly, the lower slide 7 may be made of a metal plate, but in that case it is electrically floated or grounded.

The end plate 19 on the back side of the current trench sleeve unit, including the shaft portion 191, is made entirely of AB8, PC, or other insulating material, and the electromagnetic clutch unit C is attached to the shaft portion 191.
/ A clutch shaft 30 is connected and connected with a pin 32.

In the 4-91 device, a bias is applied to the developing sleeve l, coat sleeve 2, and blade 12, and as a means for applying bias, the upper cover member 9 of the device cylinder is made of a conductive material, and the cover member 9 is made of a conductive material. Power supply terminal 36 (please 1
2 and 13) to apply a bias voltage (the power supply path to the # terminal 36 will be explained in the next section). Then 3J
Il sleeve l has a part of the upper cover @9 bent piece 91
(Fig. @1G) The following are the support plate 28, bearing ring '28°1, shaft 202, bearing 212, and end plate 21 made of conductive material.
(Fig. 10, Fig. 4), and the coat sleeve 2 is also connected to the support plate 29, bearing 291, and shaft made of conductive material through the folded self-protruding piece 91 of the upper cover member 9. 23
Bias of the same potential is applied to the non-magnetic blade 12 through the upper cover member 9 and the upper stay 8 made of a conductive material to which the cover member is screwed. The voltage is applied.

In this case, the bias applied to the developing sleeve 1 is due to the fact that the end plate 19 to which the electromagnetic clutch unit Cl is attached is made of an insulating material as described above.
Unit C/ is electrically maintained.

By utilizing the top cover member 9 as an electric path as described above, the presence of long cords and the hassle of wiring can be avoided, as would be the case in the case where a power supply cord is stretched to each part that requires bias application. The structure is simple and reasonable.

mgI! Since there is no bias in the device box 9-tube plate 5-6 and the lower steerer, problems such as toner triggering failure and toner deterioration do not occur.

For the blade support stay 8, each magnet roller shaft support plate 28 of the image sleeve 1 and coat sleeve 2 is
29 may be coupled to apply a bias to the stay 8, thereby applying a bias to the sleeve l.2 and the blade 12.

(9) Attaching the developing device to the copying machine (Kei 11-1)
Figure 5) This example device can be installed and removed into the 811 military aircraft! Damage to the surface of the photosensitive drum 9 by the loading/unloading developing device is strictly prevented.

■ In the jumping developing type developing device, the gap dc between the developing sleeve L and the drum D must always be maintained at a specified distance of 300μ±30μ regardless of the eccentric rotation or unevenness of the drum D. It is not possible to fix the device at a fixed position relative to the drum base like in a developing device, so even if there is eccentric rotation or unevenness in the drum base, the developing device can be moved to follow the eccentric rotation or irregularities. A predetermined gap dc to be maintained between the drum D and the developing sleeve L is always maintained by the natural rocking motion. Connection and disconnection are automatically performed when the developing device is installed and removed.

This has been added to eliminate the hassle and hassle of plugging and unplugging the electrical connector each time the JA imager is installed and removed, as well as the problem of forgetting to plug and unplug it.

First, the mounting structure of the developing device on the copying machine 4 will be explained. In FIG. 13, the drum D is rotatably supported by bearings between the rear and front plates of the chassis of the 37/38RI copying machine. D2 indicates the drum axis.

Regarding the chassis front plate 38 mentioned above, there is a developing device insertion opening 381 in the #l iron device mounting position corresponding to the drum D.
It is formed. Also, the rear side plate 37 of the chassis at the opening part
A developing device holder 39 (Ix4/1
Figure 5) is arranged.

A groove rail 391 is formed along the middle of the side length on the front side of the drum D110 of the pedestal 39. On the other hand, as for the storage device, downward protrusions 53 and 63 are formed on the lower side of the back side plate 5 and front side plate 6 of the container cylinder, closer to the drum D side, respectively, to fit into the groove rail 391 of the pedestal 39.

To install the developing device into the copying machine, insert the developing device into the copying machine through the opening 381 of the chassis front plate 38, with the rear side first, and insert it into the 3jls equipment box as shown in Figure 14. Connect the downward protrusion S of the back side plate 5 to the groove V-ru 3 of the pedestal 39.
91, and the downward protrusion 53 of the back side plate 5CD.
The lower side portion 54 on the opposite side is received on the pedestal 39. As a result, the developing device is tilted backwards and downwards with respect to the drum D around the downward protrusion 53, so that the front side of the developing device is largely spaced apart from the drum D. And this posture-
Slide the entire developing device on the pedestal 39 and the groove rail 391 and insert it into the copying machine. The downward protrusion 63 on the front side plate 6 side of the intermediate developing device is located at the mold groove rail portion 5.
Once it is in the corresponding position, insert the protrusion 63 into the rail 391 and move the developing device to the j! Finally, an electric circuit connector 1I40 (FIGS. 11 to 13), which will be described later, is connected to the chassis of the copying machine.
Insert it into the corresponding connector 41 provided on the back side plate 37III, and insert it sufficiently until it is received by the plate 42.

During this process of pushing and inserting the developing device, in step 3, the front side of the image device is very hot and separated from the photosensitive drum D as mentioned above and is in the friendly position, so the surface of the drum D is exposed to the developing sleeve gear GL and the spacer roller 27. This prevents the drum surface from being scratched by rubbing.

Also, the developing device is pushed in enough so that the connector 40 and 41
Until the developing device is inserted and received by the stopper 42, even if the developing device is raised centering around the protrusions 53 and 63 during the pushing and insertion process of the developing device, the front edge of the upper cover member 9 of the fJ4 image device will be damaged as shown in FIG. As shown in Fig. 14, the shaft hits the developing device insertion opening edge 382 (partially overhanging edge) of the chassis front side plate 38 and interferes with it, preventing the rotation of the head, and also the developing sleeve gear G1 and spacer roller. The structure is such that the drum 27 does not come into contact with the surface of the drum 9 to strictly protect the drum DWJ.

When the developing device is fully pushed in and the connector 40 is fitted into the connector 41 and is received by the stopper 42, the front plate 6 of the developing device box is in the opening 381 of the chassis-front plate 38 of the copying machine. In this state, there is no interference between the front edge of the upper cover part of the developing device and the opening edge 382 of the chassis front plate 38, and the entire developing device is positioned inside the chassis front plate 38. groove rail engaging protrusion 53
Raise operation centered on I-63 is possible.

14-15, numeral 43 is the operating mechanism for raising the developing device; 431 is omitted from the figure; 433 is a shaft that rotates forward and reverse by operating the nine operating levers; 433 is a bracket 43 attached to the shaft 431;
The U-shaped bracket 434 is fixedly supported through the U-shaped bracket 434, and is a nine-adjustable rod that is slidably supported on both crocodile pieces of the U-shaped metal fitting, and the retractable rod is formed in the middle of the line rod. It is compressed between the rear leg pieces of the U-shaped metal fitting 433, and is constantly biased to protrude forward by a nine-coil spring 436. 437 is advance/retreat rod 4
This is a presser formed at the tip of 34. The member mechanism of the above-mentioned placket 432 to presser 437t is the shaft 431.
It is installed in two places, one on the back side and one on the front side.

On the other hand, a protrusion 55 (the front plate 6 is not shown) corresponding to the suppressor 437 of each mechanism described above is formed at the rear of each of the front plate 5 and the front plate 60 of the developing device.

Therefore, when inserting the developing device into the copying machine, rotate the shaft 431 counterclockwise using the lever so that the inserted developing device and the device raising mechanism 43 do not interfere with each other.
4. As shown in the figure, the entire mechanism 43 is moved out of the developing device insertion path and the developing device is inserted.

ii4 The image device is fully inserted and the connector 40 is connected to the connector 41.
After the shaft 431 is inserted into the shaft 431 and received by the stopper 42, the shaft 431 is rotated clockwise by operating a lever. Then, during the rotation process, the pusher 437 of the device raising mechanism 43 comes into contact with the corresponding protrusion 55 on the multi-image device side. After that, the axis 431
When the is rotated against the weight resistance of the developing device and the force of the spring 436, the advancing/retracting rod 434 retreats while compressing the spring 436, and the suppressor 437 at the tip of the rod slips diagonally below the protrusion 55. As a result, due to the warping of the spring 436, a pushing force is applied to the developing device via the protrusion 55, and the entire developing device moves clockwise around the downward protrusions 53 and 63 that are engaged with the grooves 391 of the pedestal 39. The spacer rollers 27, 27 come into contact with both end surfaces of the drum D as shown in FIGS. 13 and 15, and are engaged with the fA image sleeve gear G1 and the drum gear GD. The raised state of the image composition device is maintained by rotating the mechanism 43 around the shaft 431, or by moving the operating lever of the shaft 431 beyond the dead center of the trap, or by locking the lever with a locking device. Ru.

In other words, the developing device is raised around the protrusions 53 and 63 by the reaction force of the spring 436v, and the spacer rollers 27 and 27 are always kept in contact with the drum D, so that the developing sleeve 1 and the drum D are kept in contact with each other.
As prescribed! The interval cl c is maintained. In this case, even if the drum D undergoes eccentric rotation and there are irregularities on the drum rim, the cushioning action of the spring 436 allows the entire developing device to maintain contact between the rollers 27-27 and the drum 9 surface. Nine tons of follow-up rocking around the downward protrusions 53 and 63 creates a predetermined gap dc between the developing sleeve 1 and the drum.
D is secured.

The raising rotation IJ of the 31 image acid position by the spring 435 is the drum DK: za 27-27 (Djfi7t! Force F (IE
If this force F is small, uneven rotation of the drum D and the ability to follow irregularities will be felt, and if it is large, the rollers 27 and 27 will press strongly against the drum D, causing the drum D cause damage to.

Alternatively, the screw 435 can be compressed considerably and attached to the metal fitting 4.
33ζ: The structure is such that there is little change in the pressing force even when it is closed and turned into a large angle. In other words, the free length is the metal fitting 433
It is set by compressing the pieces that are much longer than the two yōkataseki. This reduces the change in pressing force even with a large deflection, and allows for a compact design with a small spring constant.

Next, the electric circuit connector 40@41 will be explained (mainly shown in Figures 1i12). Connector #40 on the developing device side is fixedly attached to the outer surface of the rear side plate 5 of the entire developing device via arm members 401, and is used for applying bias to the connector 40 and the upper cover 9. Power supply terminal! 6. The electromagnetic clutch Ct is mounted and held on the lower steerer, and is connected to the sensor unit 8 (FIG. 12 and 813) for detecting the amount of remaining toner, etc. by wire connection 402.

The connector 41 on the main side of the copying machine is connected to the control turning section of the main machine at 411, and is rotated vertically about a shaft 412 on the side opposite to the developing device tW on the back side plate 37 of the main machine chassis. The attachment is maintained on the freely movable rocking plate 413.

I am allowed to hold it. The front side of the connector faces the inside of the rear side plate 37 through a window hole 371 made in the rear side plate 37. The swinging center shaft 412 of the swinging plate 413 is inserted into the copying machine and aligned with the returning center axis of the developing device, that is, the groove V-rule 3.
The extension line of the axis connecting the F-direction protrusions 53 and 63 fitted in 91 is arranged so that the axis coincides with the extension line.

, A protrusion 414 is provided at the lower part of the end opposite to the shaft 412 of the swing plate 41 a p71/JfJIP, and the bent protrusion 4 of the stopper plate 42 is fixed to the rear side plate 37 of the chassis.
21 to stop the receiver and attach the connector 4 to the IU swing plate 413
A light tension spring 415 is stretched between the swing plate 413 and the stopper plate 42 so that the swing plate 41 is constantly supported.
3 is rotated downward about the shaft 412 and pressed onto the protrusion 421 of the stopper plate 42 for positioning.

Therefore, the connector #41 of the swing plate 413 in the above-mentioned positioning state
As mentioned above, the connector 40 on the developing device side, which is pushed and inserted into the copying machine for installation, is configured to face directly, and in the final process of pushing and inserting the developing device, the connector 40 on the developing device side Protruding guide pin 40 of connector 40
3.403 is the bottle receiving hole 416-4 of the connector 41 on the main unit side
16, and with the subsequent insertion movement of the developing device, the connector 40 smoothly fits into the connector j41 and becomes connected, and at the same time, the connector 40 is received by the stopper 42 and the further developing devices are inserted. The push-in insertion is prevented and the developing device reaches the final insertion position, resulting in 9 events.

Therefore, as explained in FIGS. 14 and 15, the shaft 431 is rotated and the mechanism 43 moves the developing device to the σ-direction protrusion 53.
・By raising and rotating the spacer rollers 27 and 27 in the direction of the hour hand around 63, the spacer rollers 27 and 27 are brought into contact with the photosensitive drum DIC, and the developing sleeve gear GL is engaged with the driver gear GD, and this state is maintained. Complete the installation on this machine.

In this case, the axis connecting the protrusions 53 and 63, which is the rocking axis of the AM device, and the axis of the rocking center shaft 412 of the rocking plate 413 that supports the connector j41 are made to coincide with each other. Accordingly, the connector 41 on the machine side also maintains connection with the connector 40 on the developing device side, and rotates effortlessly about the shaft 412 together with the swinging plate 413 against the light tension spring 415, and the connector 40 - No hindrance to the mutual connection of 41. Furthermore, as described above, even if the developing device follows and swings around the protrusions 53 and 63 due to the eccentric rotation or unevenness of the drum D, the swinging plate 413 follows along with it (swinging and similarly = Nectar). There is no problem in mutual connection of 40$41.

Note that there may be some play (for example, about 1%) between the shaft 412 and the swing plate 413.
40 may be configured to freely swing around the center of swing of the developing device.

Once installed, the developing device can be taken out by rotating the shaft 431 in the counterclockwise direction by operating the lever as shown in FIG. Release the pushing force of the developing device. Then, the developing device as a whole rotates counterclockwise around the downward protrusion due to its own weight, and the rear lower side 54-64 contacts the top of the pedestal 39, and the front part of the developing device rotates around the downward protrusion 53 and the downward protrusion 53 as shown in FIG. Centered on 63, the posture is tilted backwards downward,
The spacer pro 27 on the front side of the apparatus separates from the drum D, and the developing sleeve gear Gl separates from the drum gear GD. Thereafter, the Q developing device in the downwardly inclined position is pulled toward the front side while the developing device is in that position. By this pulling, the connector 40 is automatically disengaged from the connector 41. By further pulling the developing device toward you, it is taken out of the machine through the opening 381 of the chassis front plate 38.

Even in this process of extracting the developing device, the front part of the developing device is largely separated from the surface of the drum D, so there is no abrasion damage to the surface of the drum D caused by the spacer rollers 27, 27 and gear G1. Even if the developing device is raised and operated centering on the downward protrusions 53 and 63, the upper cover 9 of the developing device
0 front edge and the chassis front plate opening edge 382 interfere with each other to prevent the developing device υ from rotating, thereby preventing the spacer rollers 27, 27 and the gear Gl from coming into contact with the drum 0 surface.

Further, even if the developing device is pulled without releasing the suppression of the developing device by the mechanism 43, the pressing force of the mechanism 43 remains.

3i#! due to interference between the front side plate 6 of the developing device and the inside of the opening edge 382 of the chassis front side plate 38 (Fig. 1113).
The imaging device cannot be removed.

(10)11 Image Shafts 19 on both ends thereof
1.211 to electromagnetic clutch 01% spacer roller 27.
27, then remove one or both bearing members 11'1
When the 4-box 9 is removed from the side plates 5 and 6, at that moment the magnet 2 in the developing sleeve 1 is attracted by the magnet 4 in the coat sleeve 2, so the toner is placed between both sleeves 1 and 2. It gets stuck and aggregates. This can lead to problems such as a large gap of toner being formed and toner being fused onto the sleeve, or toner being caught between the blade 12 and the coat sleeve 20.

An example of a structure that improves this point is shown in FIG.
As shown in the figure, the diameter R2 of the end portions 2a and 21 of the coat sleeve 2, that is, the regions L2 and L2 where no single layer of toner is formed, is made thicker, and both ends of the blade 120 are provided in contact with these portions. Here, there is a 0-step difference between the thick 1iR2 of the coat sleeve end O and the diameter R1 of the sleeve partial region L4 forming the toner brush.
-Rl)/2 is approximately equal to the desired brush ear length tl, so there is no need to remove the position of the blade 12 for maintenance or readjust it each time it is installed (R2-R1). /2・is generally α1~0,5 I
It is set to about W1. In addition, since the brush ears are formed only in the area where the magnet 4 is located inside the coat sleeve 2, only toner having the same properties such as toner triboelectricity forms a single layer of toner, so this toner is transferred to the developing sleeve 1. A very uniform thin layer is formed. Furthermore, the toner does not collect on the outer end surface of the step, thereby impairing the life of the C bearing or causing the toner to scatter. Even if the bearing part tI4111/111 of the developing sleeve unit is removed, the presence of the coat sleeve 2v large diameter part 21/2m and the following ring la
・Due to the presence of 1a, both sleeves 1 and 2 do not come closer than the difference in level, so there is no need to worry about toner fusing or clumping. Based on the same concept, an insulating resin ring 1aela made of polyethylene resin or the like is press-fitted to the end of the M image sleeve Iv, and acts as an I-no spacer to ensure a predetermined gap dc between the photosensitive drum D and the developing sleeve I. I can also do it myself. That is, the spacer rings 1a and IIl are press-fitted to both ends of the developing sleeve 1v so as to form a step dc. To give specific numbers, coat sleeve 20 steps d a =z O, 8~, 31
The level difference d c of m sleeve l is 0.3% degree.

Naturally, in the structure in which the above-mentioned spacer rings la and 1a are provided on the developing sleeve l, the spacer rollers 27 and 27 in the example shown in FIG. 4 are not required on both sides. Furthermore, the circumferential speeds of the spacer ring 11/lJI and the drum D are completely the same, and since the developing sleeve III and the drum D side are both connected by gear Gx@GDv meshing, slippage occurs between them. There is no danger that the dots will wear out during the game.

The reason why this spacer ring is made of insulating resin is not only to prevent damage to the drum D, but also to improve the developing performance of the sleeve IVC.

In particular, the imperial edict was made to increase the concentration of sex and ryotsu (section (8)).
As mentioned above, since it is necessary to apply a high potential bias to a conductor such as aluminum, which is the base of the drum D, and 1AQI.
A thin photoreceptor (generally 50 μm) is placed between the sleeves.
The above-mentioned spacer ring 11 is likely to come into contact with each other through the spacer ring 11, which may easily cause troubles such as bottle holes, so it would be extremely difficult to prevent this from happening.

Also, due to the presence of the spacer rings L and LA, when the sleeve 1 is removed from the developing device 6 box, the attraction and collision of the sleeve L in the direction of the sleeve 2 due to the magnetic force occurs with the protrusions 21 and 21 on the coat sleeve 2 side. It is prevented by a similar effect.

In summary, 3j111 in general! When assembling the device or resetting it after maintenance, it is necessary to install the blade at a distance of about ti from the coat sleeve 2 in order to form a single layer of toner on the surface of the coat sleeve with a predetermined toner thickness tf. If configured as above, the blade 12 can be easily attached to the large diameter portion 21112 at the end of the coat sleeve 2! It is only necessary to set it by pressing it against I, and adjustment and installation are extremely easy. It should be noted that when a magnetic material is used for the blade 12, the thickness of the toner layer will be thinner than the distance between the blade 12 and the coat sleeve 20, so (R2-R1)/2 is the thickness of the toner layer tl. Of course, it is necessary to make it larger. Because it is configured like this, it costs 3J for maintenance, etc.! Even if you remove the e-sleeve, it will never happen if you crush the toner layer.

(lt) Other configuration examples for applying bias to the developing sleeve, etc. (III Figures 7 to 21) As shown in the example in Figure 12, a sensor unit for detecting the remaining amount of toner, etc.)
It doesn't have S, just 8! In the case of a developing device that only needs to apply a bias to the developing sleeve, etc., it is not necessary to provide the connector J40 as shown in FIG. A part of the real side of the upper cover member 9 is made to protrude and extend 92, and the copy book 4! When the developing device is inserted and installed into the upper cover 111, the upward cover member protruding extension 9
The power supply leaf spring terminal 441t in contact with 2 can be configured in nine configurations, and 44 indicates a high voltage transformer (HV 'If') that supplies power to the leaf spring terminal 441.

In this way, the connector 40 and
41, the arrangement 1402, 411, the swing plate 413, etc. are no longer necessary, and the configuration is extremely simplified.

As explained in section (8) above, the example shown in Fig. 12 uses the upper cover member 9 as a power supply path and connects the magnet roller shaft fixing support plates 28 and 29 (Fig. 10) on the front side of the V4 imager. )
The bias is applied to the developing sleeve 1 and the coat sleeve 2 via
The figure shows an example in which a bias is applied to the sleeve 1112 and the blade 12 via the inner side member of the i-image device.

That is,: fJ Image Sleeve Unit Coat Sleeve Unit The shafts 191 and 221 on the driving side, that is, on the back side, are connected to the developing device cylinder side plate (insulating material) 5 using metal support plates 451 and 4, respectively.
Bearing support is provided via ball bearings 45 and 46 (Fig. 21) with 61. The upper end portions of the ball bearing support plates 451 and 461 are bent downwardly into tongue portions 93 and 9 formed on the real side of the upper cover part @9 of the developing device.
4 with screws 452 and 462, respectively. The end plates (7 langes) 19 and 22 on the driving side, that is, on the back side of the developing sleeve unit and coat sleeve unit are made of a conductive material (the electromagnetic clutch unit C4 is electrically connected to the shaft 191).
ytv isolated and bonded).

The power supply to the upper cover member 9 employs the leaf spring terminal contact type shown in the example shown in FIG. 17.

Then, the 'iAgI sleeve 1 includes the high voltage transformer 44 -> the spring terminal 4' 41 -> the upper cover part 9 -> the bent tongue piece 93 -> the bearing support plate 451 - + the bearing 45 ->
In the path from the shaft 191 → end plate 19; The top cover member 9 is then screwed 13, and biases of the same potential are applied to each member via the stay 8 on the conductor cylinder of the image holder box.

In the above, the ball bearings -45 and -46 are respectively used as power supply paths, but inside the bearings, the balls are always rolling and in contact between the inner and outer rings of the bearings, so there is no instability as power supply paths.

As described above, using the rear side power feeding method as opposed to the front side power feeding method of the large block imaging apparatus as described in the above item (8) is extremely effective in terms of electrical components.

It should be noted that power supply from the high voltage transformer 44 to the upper cover 1 material 9 is a little troublesome due to wiring operations, but the high voltage transformer 44 and the upper cover 1 material 9 can be connected by connecting the cord 4 and the connector j as shown by the chain line in FIG.
148 and the connector 49 of the high voltage transformer 44 to supply power.

Also, the bearing support metal of the developing sleeve 1 and the coat sleeve 2 is connected to the V-dope support surface 8.

The members 451 and 461 may be combined and a bias applied to the stay 8 of the members 451 and 461, thereby applying a bias to the sleeve 1e2 and the blade 12.

(1.Claim section of J&It As explained above, the device shown in the figure is made up of various improvements to each part, but the present application is particularly concerned with (1)
The rotational drive component of the developing sleeve IVC explained in section 6) is the claim point.

That is, the 11m clutch aQ is connected to the developing sleeve shaft 191 by the clutch engagement control.
A gear G1 (developing sleeve gear) which is a loose fitting gear is supported, and the gear G is used to rotationally drive the image bearing member.
DK engagement The gist of the invention is that the drive of the developing sleeve 1 is controlled by manual disengagement of the electromagnetic clutch described above.

As explained in the above section (6), the above drive system configuration has an extremely simple configuration and allows the developing device to be freely controlled to be driven and stopped simply by electrically controlling the electromagnetic clutch cl on and off. The drive unit can be designed compactly. By making the developing sleeve shaft 191 made of insulating material, the stain magnetic latch e
It is possible to apply a suitable bias pressure to the iJL image sleeve without electrically adversely affecting the image slider.

Effects such as being able to easily control the drive of the coat sleeve 2 toner replenishing screw shaft 14 and the like in conjunction with the developing sleeve shaft 191 can be obtained.

[Brief explanation of the drawing]

Figure 1 shows an example of a developing device using a one-component developer.
l? The side view, Figure 2, shows the developing sleeve and developing target g of the device.
FIG. 6 is a cross-sectional view of a device according to an embodiment of the present invention, FIG. 4 is a longitudinal developed plan view along the N-IV edge of FIG. 6, and jiAA is a deformation of the blade. The plan view of the example, Figure kJJJ5 is a perspective view of the developing device barrel, Figure 6) is an inner view of the fruit side of the six boxes, Figures 7 and 8 are external views of the front plate. Assembling the coat sleeve unit and the developing sleeve unit for the 6-layer assembly IL1 1
US2 clear drawing, Figure 9 (a) is the inner view of the back plate of Jubei Kisei, Figure 10 (b) is the outer view of the front plate, and Figure (e) is the inner view of a modified example of the back plate. Fig. 10 is an external view of the front plate side of the developing device shown in Fig. 44, Fig. 11 is an external view of the central plate side, and Fig. 12 is an external view of the developing device of Fig. 44.
The figure is an N view of the rear plate side of the developing device and the electrical circuit connector and stopper portion of the double-sheet copy book +1A @. Figure 13 is a plan view of the developing device in the J#I state when installed on the machine. 1
Fig. 4 is a side view of the developing device in the state of ^σ, which is stored in the copying machine and then transferred. Figure 15 shows the side #r@- diagram of the developing device in a state where it has been raised and rotated so that the space rollers are in contact with the drum surface, @16
The figure is a longitudinal developed plan view of a modified example device of the device shown in FIG.
Figure 7 shows an example of a copying machine in which bias power is supplied to a member of the top cover of the developing device by flattening the spring plate terminal of the high-voltage transformer to the long protrusion of the member. Figures 4 and 18 of the layered developing device, Figures 18 to 2
Figure 1 shows the configuration of an example in which the developing sleeve/coat sleeve → is connected to the glaze JA @ board side. A vertical developed plan view, Fig. 19 is an external view of the center plate side. Fig. 20 is a plan view of the current 1M scissor tube center side plate side, Fig. 21 is a perspective view of the bearing part, and Demeru 0 1 is the developing sleeve. , 2 is a coat sleeve, 6 and 4 are magnet rolls inside those sleeves, L) is a drum, 1
2 is a non-magnetic blade 0 Figure 2 Figure 5 Figure 7 i () 7→N Iol fight? ] 45th country

Claims (1)

[Scope of Claims] (2) The developing sleeve shaft supports a gear that is connected to and loosely fitted to the developing sleeve shaft by an electromagnetic clutch and on/off control of the clutch, and the gear is connected to the latent image bearing member. 9. A developing device characterized in that the electromagnetic clutch is engaged with a gear to be driven and the driving of the developing sleeve is controlled by turning on and off the electromagnetic clutch. (2) Developing sleeve that supports the electromagnetic clutch and gears
The shaft is made of an insulating material to cut off the influence of the bias voltage on the electromagnetic clutch when a bias voltage is applied to the developing sleeve. A developing device according to claim (1), characterized in that: (3. The surface of the developing sleeve is attached to the shaft at both ends of the developing sleeve,
A spacer roller was fitted to maintain a predetermined gap between the latent image bearing member and the latent image bearing member. Claims Im (1)
) The developing device described in item 1.