JPS5857151A - Developing device - Google Patents

Abstract

PURPOSE:To prevent the damage of the surface of a photosensitive drum which is caused by rubbing and pressing with an attachable and detachable developing device in the attachable and detachable process to a copy machine body. CONSTITUTION:A developing device is inserted into a copy machine body from an aperture 381 of a chassis front plate 38 so that the deep side of the developing device is first inserted, and a downward projecting part 53 of a deep plate 5 of the developing device box is fitted to a grooves rail 391 of a receiving table 39, and a lower side part 54 in the side opposite to that of the downward projecting part 53 of the deep plate 5 is received on the receiving table 39. The whole of the developing device is slided on the receiving table 39 and the grooves rail 391 in this attitude as it is and is pressed int the copy machine body and is inserted. In this insertion, when a downward projecting part 63 in the side of a front plate 6 of the developing device faces to the grooved rail 391, this projecting part 63 is fitted to the rail 391 to press the developing device into the machine body furthermore; and finally, an electric circuit connector 40 drovided on the outside face of the deep plate 5 of the developing device box is fitted to a similar corresponding connector 41 provided in the side of a chassis deep plate 37 of the copy machine body, and the developing device is inserted sufficiently until it is stopped by a stopper plate 42.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device that visualizes latent images such as electrostatic images, potential images, and magnetic images.

Conventionally, as a dry development method for developing electrostatic charge patterns, etc.
When divided based on the composition of the developer, there are two-component development methods and one-component development methods. In the former, the developer consists of a mixture of carrier particles such as iron powder or glass beads and toner particles that actually develop the electrostatic image. This two-component development method has the drawbacks of fluctuations in image density due to changes in the mixing ratio of carrier particles and toner particles, and deterioration of image quality due to deterioration of carrier 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. Generally known and used one-component developers have magnetic properties within the toner particles due to frictional electrification caused by relative movement and the need for a means to transport the developer to the development area facing the electrostatic image. This includes powder. However, the content of the magnetic powder is naturally limited because the toner image on the transfer paper is fixed to the transfer paper using means such as heat or pressure. come. In practice, magnetic powder occupies 10% to 60% by 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%. Since the volume occupancy of the magnetic powder in the toner is very small, the behavior of the toner in the magnetic field is different from that of magnetic powder alone, forming a long brush with a sparse density at the magnetic pole position. It becomes difficult to do. Therefore, when the thickness of each toner layer on the toner support member is restricted to several volumes, the toner layer on the support member tends to be uneven and non-uniform.

This non-uniformity of the toner layer on the support member is likely to be directly reproduced in the developed image, and since the toner layer is dense, variations in layer thickness will 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 for forming this uniform toner thin layer, the present applicant previously published Japanese Patent Application No. 53-92108 (Japanese Patent Application Laid-Open No. 55-151).
A developing device as described in Japanese Patent Publication No. 673 was proposed.

The outline of this developing device is explained with reference to FIG. 1.N and S magnetic poles N1, Sl, N2, 82-N3,
A sleeve 100 (toner support member) made of non-magnetic stainless steel or the like is fitted onto the magnet roll 101 magnetized with S3, and this sleeve 100 is attached to the magnet roll 10.
1 is fixed and its circumference is rotated clockwise as shown in the figure. Magnetic blade 102V provided opposite cut pole N1
i104, L-The insulating magnetic toner T in the developer container box surrounded by the toner fall prevention stay 105 is removed by the sleeve 100.
Apply the appropriate thickness on top. dlV: f is the gap distance between the magnetic pre-made 102 and the sleeve 100. The toner applied to the surface of the sleeve 100 is transferred to the gap d2 between the sleeve 100 and the photosensitive drum D at the position of the development pole S1, and is electrostatically charged. A visual image corresponding to the image can be obtained.

At this time, the thickness of the toner applied to the sleeve 100 is 50 to 1
00μ, and the gap d2 in 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 fall prevention stay 105 gradually narrows, becoming the narrowest at the bottom, and thereafter maintaining that distance.This distance is not used for development. In order to allow toner (residual toner) to enter easily, d 3 is preferably about 1.3 to 2 ITIITl. On the way, the point d4 becomes extremely narrow to prevent 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 toner from falling and replenishing from above to prevent the toner from spilling out in the X direction. fulfill the eyes. Note that it is better to provide the magnetic pole S2 at the surface position of the in-sleeve magnet roll 101 corresponding to this d4.

This is because the brush of the applied toner stands up at the magnetic pole S2, which has a synergistic effect, making it difficult for the toner falling from above to leak. For the above-mentioned use, the narrower the distance d4 is, the better; however, in reality, a distance of about 0.7 to 1.3 mm is appropriate so that the toner not used for development can easily pass through.

After passing through the above-described interval 64, the toner on the sleeve 100 is scraped off by a cleaner 106 made of a spring material such as phosphor bronze or stainless steel. The scraped toner T is Y
It passes through the hole 106a of the cleaner 106 in the direction shown in FIG. This force is due to the magnetic force of the magnetic pole N3 and the pushing force of the toner scraped off one after another from below.

N2 is a transport pole provided at an intermediate position between magnetic poles S1 and 82 of the magnet roll 101, and 83 is a transport pole provided at an intermediate position between magnetic poles N3 and N1. A wire 108 attached to a shaft 107 rotates counterclockwise to agitate the toner T in the developer container box.

In the above-mentioned developing device, the photosensitive drum D and the sleeve 100 are moved in the same direction at approximately the same circumferential speed in the developing section (the opposing portion of the drum D and the sleeve 100), or to be more precise, the sleeve circumferential speed is about 2 to 3 inches. is made slower than the circumferential speed of the drum, and the moving speed of the applied toner brush tip plus the speed increase due to the rolling of the brush ear is made equal to the drum speed, and the toner on the sleeve is brought to the potential of the latent image on the drum. Attract electrostatically.

Because of this configuration, as shown in FIG.
A sleeve gear GS is fixed on the same axis as the photosensitive drum D and a drum gear GD on the same axis is engaged with this gear GS.
The rotational speeds of the photosensitive drum D and the sleeve 100 are related as described above.

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

The drum gear has 160 teeth, the sleeve diameter is 32.4%, and the sleeve gear has 33 teeth.

In this developing device, the applied toner brush formed on the surface of the sleeve 100 does not come into contact with the photosensitive drum.
The toner TI/i is electrostatically attracted by 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 constructed so that there is no uneven rotation. Otherwise, a configuration in which the Drano gear ( ) D and the sleeve gear O8 are meshed with each other while the toner moves through the distance d2 can be said to be the best because it can completely prevent uneven rotation between them.

Even with the developing device configured as described above, when the process speed is high, for example, at about 330 nyn/sec, the gap d1 between the toner application part and the sleeve 100 is 0.
．． If it is not about 1%, it may become somewhat unstable when applying toner to 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 that area.

If this phenomenon continues, subsequent toner application becomes unstable and toner is not applied to the peripheral surface of the sleeve corresponding to the stuck area. When developing with such a sleeve, uneven development and white spots occur, which is undesirable.

The present invention solves the above-mentioned problems with this type of developing device, as well as other problems such as the bearing part 1 of the rotating sleeve, etc.
A developing device that is comprehensively superior by solving at least one or more problems related to the drive mechanism, sealing means for preventing toner leakage and scattering, means for maintaining the required gap, assembly and device mounting means, bias application means, etc. The object of the present invention is to provide an apparatus in which at least one new device is added mechanically and methodically to each part of the apparatus.

(1) Overall schematic configuration of the device (mainly Figures 3, 4, and 5) This example device will be specifically explained based on the illustrated device. Apply the coating using the blade 10 as in the example device shown in Figure 1.
Instead of doing it with 2, it was configured so that it was done with a coat sleeve.

That is, in FIGS. 3 and 4, bearings 10 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.
．． The developing sleeves are a pair of parallel developer holding members arranged at 11.11, and a coating sleeve that transfers 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. Both of the magnet rolls 3 and 4Vi rotate in a wandering manner, and the sleeve 2 is driven to rotate clockwise in FIG. 3 around the rolls.

On the surface of the built-in magnet roll 3 of the developing sleeve 1, there are four magnetic poles 5il (coat pole), Na (transport pole), sb (developing pole), and Nb (transport pole) along the circumference as shown in FIG. It is magnetized.

The human blood on the magnetic roll 4 in the coat sleeve 2 also has eight magnetic poles Nc and Sc at approximately equal intervals along the circumference.
* Nd * Sd @ Ne @ Se * Nf
*Sf 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. A sleeve is used as a magnetic pole Nd Vi coated pole.

Coat pole Nd of coat sleeve side magnet roll 4
and the coat pole Sa of the magnet roll 2 on the developing sleeve side.
are almost facing each other, but not directly facing each other, and the polar Nd
With respect to K, the pole Sa is positioned slightly shifted toward the upstream side with respect to the rotation direction of the developing sleeve 10.

The developing device barrel includes rear and front side plates 5 and 6 that bear the sleeve 2, a concave lower stayer serving as a bottom plate, an upper stay 8 that holds the non-magnetic blade 12, and the upper stay 8. It consists of a top cover member 9 with a size extending from the top surface of the developing sleeve 1 to the top surface of the developing sleeve 1, and these components are connected to each other with screws 13 or the like and assembled into a single container box. FIG. 5 shows a perspective view of the assembled container box. The upper cover member 9 is installed after the necessary parts have been assembled into the chamber.

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 made of aluminum or the like is screwed to the bent portion 8b.
Step 1 is installation. When the opening 8 is opened and the upper cover is removed, the opening 8 is exposed.
a) Maintenance inside the developing device can be performed using .

The toner T is stored as a toner storage portion in a space within the container cylinder surrounded by the substantially left half of the lower stayer, the upper stay 8, the nonmagnetic blade 12, the substantially left half circumferential surface of the coat 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 protruding from the outer surface of the front plate 6, and is connected to the end wall of this supply chamber and the developing toner storage section. A toner delivery screw shaft 14 is rotatably disposed between bearings 15 and 15 between the rear side plates 5 of the device. However, the screw portion 141 is not formed over the entire length of the shaft 14, and the screw portion 141 is not formed over the entire length of the shaft 14.
1. Only the inner shaft portion is formed. The top opening 61a (FIG. 5) of the chamber 61 is connected to the mouth of a container containing replenishment toner, a container communication pipe, or a used toner return pipe that returns from the copying machine cleaner section. is omitted from the figure.

As will be described later (section (6)), when both the developing sleeve 1 and the coat sleeve 2 are rotationally driven in the clockwise direction indicated by the arrow in FIG. The toner T is coated on 12 portions of the non-magnetic blade to an appropriate thickness. Next, at the closest opposing portion between the coat sleeve 2 and the developing sleeve 1, a thin layer of toner is applied to the surface of the developing sleeve 1 by the coat sleeve 2.

The surface of the developing sleeve, on which a thin layer of toner 1 has been applied, rotates to a position facing the photosensitive drum D, and selectively jumps to the side of the drum gD in accordance with the latent image pattern on the drum surface to form a latent image. is visualized.

As the sleeve 1 continues to rotate, the toner on the developing sleeve 1 that has not been used for development returns to the part facing the coated sleeve 2, and the toner on the coated sleeve 2 side is mixed with new toner.

Alternatively, the developing sleeve is scraped off and a new thin layer of toner is uniformly applied to each part of the surface of the developing sleeve, and the cycle of the thin layer of toner being rotated again to the developing section is repeated and used as a latent image bearing member. Continuous development of the latent image on the zero 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 1 is the closest to each other, and db is the gap between the developing sleeve 1 and the photosensitive drum D. For example, da=0.8mm, d'b=1.0mm,
Coated magnetic pole Nd = 1 0 0 0 Gauss, 5a =
With the setting of 800 Gauss, there is approximately 0 on the surface of coat sleeve 2.
．． A single layer of toner with a thickness of 9 nvn is applied, and a thin and uniform layer of toner with a thickness of about 60 μm is applied on the surface of the developing sleeve 1. dc is 0. 1~0. It is set to about 3 nyn.

The toner T in the toner storage section gradually decreases as it is consumed,
Toner is sequentially delivered from the supply chamber 61 side by rotation of the toner delivery screw shaft 14 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 gap between the above-mentioned parts will be smaller than when forming the toner thin layer on the developing sleeve 1 directly with the blade 102 as in the apparatus shown in FIG.・Even if 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, and it is possible to form a thin and uniform toner layer on the surface of the developing sleeve 1 in a stable manner. - Trouble with poor toner application due to clumping of aggregated toner, etc. is greatly reduced.

(2) Structure to prevent toner from scattering outside the container box due to the rotational drive of the sleeve 2 (Figure 3) The sleeve 2 is exposed to centrifugal force due to the rotational drive, and a portion of the applied toner on its surface may be large or small. The toner is separated and toner scattering is observed. In this case, the coated toner layer on the developing sleeve 1 side is formed by the transfer of the toner with sufficient tribo on the coating sleeve 2 side, so even if the sleeve rotation is considerably fast (i.e., even if the sleeve rotation is considerably fast (in other words, if the processing speed is (Even when used for 2019), there is little toner separation and scattering due to the rotational centrifugal force of the sleeve, but COATOS! On the J-F2 side, the coated toner layer is thicker, brush-like, and there is a toner with a small tribode, so toner separation and scattering is likely to occur.

Therefore, in the apparatus of this example, in order to prevent the separated toner from scattering outside the cylinder, the top cover member 9 covers the upper part of the coat sleeve 2 and the developing sleeve 1, and the top edge of the cover member 9 is was sufficiently extended to a point close to drum D.

In addition, the scattered toner generated around the coat sleeve 2 rides on the rotating wind caused by the rotation of the coat sleeve 2 and the developing sleeve 1 and travels through the space passage between the back surface of the upper cover member 9 and the upper surface side of the sleeves 2 and 1. In order to prevent the developing sleeve 1 from coming out of the container box through the gap between the front surface L of the developing device container box and the developing sleeve 1 as shown by the chain line arrow T', a coat sleeve 2 is installed in the middle of the space passage. A plate-shaped fin (baffle plate) 16 that divides the space passage into left and right sides with the opposing part of the developing sleeve 1 as a border is attached and supported at its upper side to the back surface of the upper cover member 9, and its lower side is attached to the coat sleeve 2. The developing sleeve 10 is provided so as to extend close to the opposing portion.

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 hits the surface of the fins 16 on the way, and the flow is obstructed and weakened or disturbed. The scattered toner is collected on the fin surface, and almost all leakage and scattering outside the container is prevented.

The lower side of the fins 16 may be close to either the sleeve 1 or V'i2, or a plurality of fins may be provided along the above-mentioned spatial passage. We also attempted a design in which the fins 16 were not provided and the space passage between the upper cover member 9 and the sleeves 2 and 1 was narrowed, but the scattered toner wind riding on the rotational wind of the sleeve made it relatively easy to narrow the space passage. The toner leakage and scattering was observed outside the container, and the effect of preventing toner leakage and scattering was found in Fin 1.
It was worse than if 6 were provided.

The scattered toner wind riding on the rotating wind of the main sleeve tends to be drawn out of the container even through the gap between the end faces of both ends of the developing sleeve 1 and the inner surfaces of the side plates 5 and 6 of the container.

Therefore, in the device of this example, the gap is closed and
In order to prevent the toner from scattering outside the container cylinder, a portion of the back surface of the top cover member 9 corresponding to the gap between the end surfaces of both ends of the developing sleeve 10 and the container side plates 5 and 6 on those sides is provided. A downwardly facing elongated piece (elongated fin) 17 is provided in the radial direction of the end face of the developing sleeve and inserted into the gap, and an elongated cushioning seal 18 made of maltbren or the like is attached to the elongated piece 17 to support the sleeve. The above-mentioned gap was closed without any trouble during 10 rotations. The above-mentioned maltbrene etc. 18 that serves as a seal may be inserted in the form of a circular shape that is one size larger than the end surface of the developing sleeve 1 instead of a long thin strip piece, but when assembling the developing sleeve 1 into the mold box, it may be a little difficult to assemble it while pressing it down. Since this would be troublesome, in the device of this example, a piece in the form of an elongated strip was 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) Bearing part of sleeve 2 (Figures 4 and 8) Bearings 10 and 10 at both ends of developing sleeve 1 and coat sleeve 2
．． When toner enters into the sleeves 11 and 11, the toner condenses and the rotational performance of the bearings 11 and 11 as bearings deteriorates, thereby impairing the drive of the sleeve 2. In particular, ball bearings are susceptible to toner intrusion.

Even if the side of the bearing on the inside of the developing device is closed off with an oil seal, for example, in this type of developing device, the sleeve 1 is closed during operation.
The force of the toner on the circumferential surface of the cylinder and the toner in the toner storage section toward the end of the sleeve is quite strong, so over a long period of time, the toner passes through the oil seal and enters the bearing. can be seen.

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

First, the developing sleeve 1 is unitized with the internal magnet roll 3 in the following manner. That is, developing sleeve 1
The end opening on the back side has a relatively long solid shaft 191 formed at the center of the outer surface, and an end plate (flange disk) 19 having a bearing 192 fitted and held in a recessed portion at the center of the inner surface is fitted into an integral part. It is occluded by coupling it to. The magnet roll 3 is integrally connected to a central shaft 20, and the shaft 20
The protrusion length of the back end 201 is short, and the protrusion length of the front end 201 is short.
The protrusion length of No. 2 is relatively long. Then, the magnet roll 3 is inserted through the opening at the front end of the developing sleeve 1, and the back shaft portion 201 of the magnet roll 3 is fitted and held in the bearing 192 at the center of the inner surface of the back end plate 19 of the developing sleeve 1. state. Next, a relatively long cylindrical shaft 211 is formed in the center of the outer surface, and a bearing 21 is formed in the recess in the center of the inner surface.
2 is fitted and held, the front shaft 202 of the magnet roll 3 is fitted into the cylindrical shaft 211, and the base of the shaft is fitted into the bearing 212 at the center of the inner surface of the end plate 21 for development. It is fitted into the opening on the front side of the sleeve 1 and joined together. That is, the magnet roll 3V'i is built into the developing sleeve 1 in a sealed manner with end plates 19 and 21 on the back side and the front side, and the developing sleeve 1 is mounted on bearings 192 around shafts 201 and 202 at both ends of the magnetic roll 3.・212
, the entire structure is unitized so that it can rotate freely via the end plates 19 and 21.

The coat sleeve 2 also has the same structure as above, and is unitized with the internal magnet roll 4.

That is, 22 is the back end plate of the coat sleeve 2;
1 is a solid shaft at the center of the outer surface of the end plate, 222 is a bearing fitted and held in a recess at the center of the inner surface, and 23 is the center shaft of the magnet roll 4, which is integral with this shaft. 231 and 232 are protrusions on both ends of the roll of the shaft; 24
is the front end plate, 241 is the cylinder axis at the center of the outer surface of the end plate, 24
2 shows a bearing that is fitted and held in the four central parts of the inner surface.

Hereinafter, when it is written as a "developing sleeve unit", it means an assembled structure as a two-unit assembly of the above-mentioned developing sleeve 1 and the magnet roll 3, and when it is written as a coat sleeve unit, it also means the above-mentioned coat sleeve 2 and magnet roll 3. This refers to the assembled structure of the roll 4 as a unit.

The developing sleeve unit has protruding shafts 191 and 2 on both ends thereof.
11 is rotatably supported between the back side plate 5 and front side plate 6 of the developing device box via bearings 10, 10, respectively. Similarly, the protruding shafts 221 and 241 on both ends of the coat sleeve unit are rotatably supported in the support 11 between the back side plate 5 and front side plate 6 of the developing device box via bearings 11 and 11, respectively. In order to strictly prevent the intrusion of toner over a long period of time, the following bearing structure is used. That is, each of the bearings 10, 10, 11, and 11 is inserted into a resin cylindrical casing 111 and held bare, and an oil seal 112 is installed in the opening of each casing on the inside of the developing device container box. Make it into a form in which it is inlaid. The bearing and oil seal built-in casing 111 are held by the back side plate 5 and front side plate 6 of the developing device box, and the built-in bearings 10, 10, 11, and 11 are connected to the shafts 191 and 191 at both ends of the developing sleeve unit. 211, the shafts 221 and 241 at both ends of the coat sleeve unit are supported, and the shafts 191 are mounted on the outer surfaces of the respective first and second end plates 19, 21, 22 and 24 of the developing sleeve unit and the coat sleeve unit;
2-r Annular groove 193 concentric with 1, 221, 241
・213, 223, 243 are formed, and the above-mentioned bearing and oil seal built-in bearing casing 11 are formed in each annular groove.
The inner end of 1 is inserted into the inner end.

In other words, if the bearing configuration is as described above, each bearing 10 and 11
0.11.11 prevents direct toner from being covered with toner due to the presence of the cylindrical casing 111 and the oil seal 112, and the inner side of the developing device cylinder of each cylindrical casing 111 is connected to each of the developing sleeve unit and coat sleeve unit. Since the annular grooves 193, 213, 223, and 243 formed on the outer surfaces of both side end plates 19, 21, 22, and 24 are structured so that the toner is prevented from going around to the inner end surface of the casing 111, Even if there is a problem, the amount is small and the toner acting pressure on the oil seal 112 is small. Therefore, the phenomenon in which toner passes through the oil seal and enters the casing and acts on the bearings 10, 10, 11, and 11 is eliminated, and the・The problem of toner intrusion into 10.11.11 is strictly prevented for a long period of time. Further, the structure in which the bearing portion extends therein has the effect that the entire developing device can be made smaller by the amount of penetration.

On the other hand, the toner T in the toner storage section passes through the gap between the back end plate 22 of the coat sleeve unit and the back side plate 5 of the mold box, and the gap between the front end plate 24 and the front side plate 6 of the container box. This prevents the toner from spilling out toward the developing sleeve unit and scattering, or from being caught by the developing sleeve 1 or coat sleeve 2, causing the toner on the sleeve 1 to become uneven in thickness or mottled. In order to do this, the apparatus of this example closes the gap by intervening a disk-shaped sealing material 25 made of a cushioning material such as maltbrene in the gap. In this case, when the coat sleeve 2 is rotated, the back end plate 22, the front end plate 24 and the sealing material 25,
In order to prevent the sealing materials 25, 25 from being worn out due to sliding with the 7-ru materials 25, 25, the end plates 22, 24 side surfaces of the 7-ru materials 25, 25 are coated with a low-friction material such as polyethylene resin or polyacetal resin. The thrust sheets 251, 251 are laminated or the like.

By interposing the sealing material 25-25 in this way, 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.

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

Fig. 9 shows a configuration of a conventional assembly that can be inserted and removed freely.
)) and the front plate 6 ((b)) into which the bearing portions of the developing sleeve unit and coat sleeve unit are fitted, respectively.
Through holes a * b, a' * b' for each piece are formed, and for the back side plate 5, a part of the edge of the plate 5 is cut out to form a slit through hole C that leads to through hole a, and through holes a and b. A slit hole d is formed which interconnects the slits. The width dimensions of the slit holes C and d are such that the rear shaft portions 191 and 221 of the developing sleeve unit and the coat sleeve unit can pass therethrough.

In the developing device box assembled using the side plate 5@6 as described above, first insert the front shaft portion 241 of the coat sleeve unit into the through hole b' of the front side plate 6 of the side plate. Insert it from the inside and make it protrude to the outside surface of the side plate, then align the back side shaft portion 221 with the slit hole C at the edge of the back side plate 5 of the mold box, and connect the slit hole C → hole a → communication slit hole d. through the hole and place it in the hole. Then, bearing members are fitted onto the shaft portions 221 and 241 at both ends of the coat sleeve unit that protrude from the through holes bb' to the outside of the side plates 5 and 6, respectively. b
-b' to prevent it from coming out. As a result, the coat sleeve unit is assembled to be freely rotatable via the bearing between the side plates 5 and 6 on the back and front sides of the container box.

Next, remove the front shaft portion 2 of the developing sleeve unit.
11 is inserted into the through hole a' of the front side plate 6 of the mold box from the inside of the side plate so that it protrudes to the outside surface of the side plate, and then the back shaft part 191 is made to correspond to the slit through hole C of the back side plate 5 of the mold box, and the passage is opened. C
is placed in through hole a. And through hole a@a'
Bearing members are externally fitted onto both end shaft portions 191 and 211 of the developing sleeve unit that protrude outward from the side plates 5 and 6, respectively, and the externally fitted bearing members are fitted into the through holes a@a' of the side plates 5 and 6, respectively. to prevent it from coming off. As a result, the developing sleeve unit is assembled to be freely rotatable between the side plates 5 and 6 on the back side and the front side of the container via the bearing member.

After assembling the above-mentioned sleeve units, the connecting slit d connecting the through holes a and b in the back side plate 5, and the slit through hole C of the through hole a, if necessary, are closed by attaching a blind plate.
Treat. To remove the assembled sleeve unit, follow the above procedure in reverse order.

However, the above assembly has the following problems.

Regarding the back side plate 5, deep cuts are formed on the plate surface as shown in c+IMJ (a), consisting of a series of slit holes C, through holes a, connecting slits through holes d, and through holes, which improves strength. There's a problem. Especially when a coat sleeve unit and a developing sleeve unit are installed, the deep cut c-a-d- is caused by the weight of both units and the magnetic attraction force between the built-in magnet rolls of both units.
The upper and lower parts of the back plate 5 bordering on b are slightly open around the through hole, and as a result, both sleeve units are assembled with a predetermined clearance interval φb of the rain unit.
It doesn't come out.

II When sealing the communication slit hole d and the slit hole C, a complete seal cannot be achieved by simply placing a blind plate against it and tightening screws, and the toner inside the container may leak between the blind plate and the side plate 5. It leaks from small gaps, so it takes a lot of effort to seal it up.

Also, for example, as shown in FIG. 9(c), the through holes a and b of the back side plate 5 are not communicated through the connecting slit hole d as shown in FIG. Unlike the configuration shown in FIG. 9(a), the plate 5 is different from the configuration shown in FIG.
The reduction in strength is reduced, and the predetermined clearance db can be easily achieved when assembling both sleeve units. However, there are difficulties in how to attach the back side plate 5 and the lower stayer to each other, and in how to close the slit hole d' formed at the bottom.

Therefore, the apparatus of this embodiment is designed to avoid the above-mentioned problems in assembling the developing sleeve unit and coat sleeve unit into the developing device box. This is the fifth
This will be explained in Figure 8. That is, as shown in FIG. 6(a), regarding the back side plate 5 of the container, each back side bearing part of the developing sleeve unit and coat sleeve unit (in this example, bearings 10 and 1)
Two through holes 5a and 5b are formed into which the cylindrical casing 111 (hereinafter referred to as the bearing member 111) into which a cylindrical casing 111 and an oil seal 112 are inserted are fitted, and a part of the edge of the plate 5 is cut out to form the through holes. A slit hole 5c communicating with 5a is formed. The through hole 5b is a communication slit through hole d with the through hole a as shown in FIG. 9(a), or a slit through hole d/as shown in FIG. 9(C).
It does not form a hole and is an isolated hole. Regarding the front side plate 6, as shown in FIG. 6(b), there is a through hole 6a into which the front side bearing member 111f of the developing sleeve unit is fitted, and a through hole with a diameter slightly larger than the outer diameter of the coat sleeve unit sleeve 2. A hole 6b is formed.

Regarding the developing device box (Fig. 5) which is assembled with the side plate 741 which has been subjected to the hole-drilling process as described above, first, the hole 5b on the inner surface of the back side plate 5 of the mold box is filled with )
The bonding material of the disc-shaped cushioning sealing material 25 and the thrust sheet 251 described in Section 1 is pasted in advance. Next, as shown in Figure 7, the front end of the coat sleeve unit is inserted into the large-diameter through hole 6b of the front side plate 6 of the mold box from the inside of the side plate, and is projected to the outside of the side plate 6 by an appropriate length. Back shaft part 22 of coat sleeve unit
1 inside the mold box, then position its shaft 221 in the through hole 5b of the back side plate 5 of the mold box, and push the coat sleeve unit until the back end plate 19 touches the thrust sheet 251 surface. By pulling the coat sleeve unit in five directions, the inner shaft portion 221 of the coat sleeve unit is brought into a state in which it projects outward from the through hole 5b of the inner side plate 5 (FIG. 8). Next, the bearing member 111 is externally fitted onto the shaft portion 221, and the externally fitted bearing member 111 is fitted into the through hole 5b of the back side plate 5. - The front shaft portion 241 of the coat sleeve unit that protrudes outward from the large-diameter through-hole 6b of the male side plate 6 has a central portion of the disc-shaped lid plate 62 that fits into the large-diameter through-hole 6b. The fitted bearing member 111 is externally fitted. A disc-shaped cushion, a sealing material 25 and a thrust sheet 2 are placed on the inner surface of the lid plate 62 in advance.
The laminate material No. 51 was pasted and processed. 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 fitted into the through hole 5b of the back side plate 5 and the cover plate 62 fitted into the large diameter through hole 6b of the front side plate 6 are prevented from coming out by appropriate means. This allows the coated sleeve unit to be attached to the back and front side plates 5 and 6 of the mold box.
In between, the bearings 11 and 11 are used to freely rotate and assemble the parts.

Next, remove the front shaft portion 2 of the developing sleeve unit.
11 is inserted into the through hole 6a of the front side plate 6 of the container box from the inside of the side plate so that it protrudes to the outside surface of the side plate (Fig. 8), and then the back shaft part 191 is inserted into the slit through hole at the edge of the back side plate 5. 5c, it passes through the slit hole 5C and is positioned in the 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.
11, respectively, and then the externally fitted bearing members 111, 111 are fitted into the through holes 5a, 6a of the side plates 5, 6, respectively, and removed.

As a result, the developing sleeve unit is freely rotatably assembled between the side plates 5 and 6 on the back side and the front side of the mold box via the bearings 10 and 10.

That is, since the developing device of this example has the above-mentioned configuration in which the developing sleeve unit and the coat sleeve unit are assembled into the developing device box, the predetermined clearance interval db between both sleeve units is maintained so that the strength of the side plate is sufficiently maintained. It is easy to take out the sleeve units, and the distance between them is maintained stably over a long period of time.It is easy to assemble and remove (reverse the assembly procedure described above), and the mutual positional relationship of both sleeve units is reproducible when reassembling. 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).
Although 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. In that case, toner leakage will not occur if the fitting length is set at 2 to 3%. Furthermore, in order to prevent the toner from flowing into the developing sleeve unit from the gap space between the end plates 22 and 24 of the coat sleeve and unit and the side plates 5 and 6 of the cylinder, the developing device in this example uses a malt blend (sealer) to seal the gap space. material) 25 to -14
However, in the side plate configuration shown in Figure 9, the back side plate 5
Since the coat sleeve unit must be installed within the distance between the coat sleeve unit 2 and the front side plate 6, the distance between the side plates 5 and 6 is the length of the diagonal line of the end plates 22 and 240 on the back and front sides of the coat sleeve unit 2, that is, as shown in Fig. 8. A length of I, 1 is required, and the space that must be filled with mold breno 25, which is a sealing material, becomes large.

My father, I had to set the coat sleeve unit with the Malt Bren compressed, and after repeatedly inserting and removing the coat sleeve unit, the Malt Bren 25
The thrust sheet 251 is likely to peel off or be damaged.

In the method of setting the coat sleeve unit as shown in FIGS. 7 and 8, it is not necessary to shrink the maltblen 25 and then set it, and the assembly is easy.

(5) Attaching the screw shaft, blade, etc. (Figures 3 and 4) After assembling the developing sleeve unit and coat sleeve unit to the developing device box as described in the previous section, install the screw shaft 14 for toner delivery. The bearings 15 are rotatably supported by 15° and assembled into the barrel. Also, a non-magnetic blade 12 is attached to the diagonally downward bent portion 8b of the upper stay.
and scoop member 2626 are aligned with screws 121-121 to maintain attachment. In this case, the blade 12 has a predetermined gap d between its lower side and the coat sleeves 2 and 9.
Adjust the position 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 approaching both end surfaces of the coat sleeve 2, and will be explained in a separate section.

After assembling the necessary members into the vessel cylinder as described above, the plate-like fins 16 and the elongated sealing material 1 described above with respect to the top of the surface are placed on the back side.
Place the top cover member 9 to which 8 is attached and screw it onto the upper tee 8.

Further, regarding the developing sleeve unit, bearings 271 and 2 are provided on the shaft portion 191 that protrudes outward from the back side plate 5 of the mold box, and the cylindrical shaft 211 that protrudes outward from the front side plate 6 of the mold box, respectively.
The spacer rollers 27 and 27 are mounted and supported through 71 until the rotation reaches zero. This spacer roller 27Φ27 comes into contact with both ends of the rice-sensing 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 jumping development like the developing device of this example, the spacer roller 27.
Since 27 also rotates once, bearings 271 and 27 on the inner circumference of the roller
1 may be ζ. That is, the spacer rollers 27, 27 may be press-fitted into the shaft portions 191, 211 of the developing sleeve unit so as to be integrated with the shaft, or may be lightly fitted into the shaft portions 191, 211. The material of the spacer rollers 27 is preferably a soft resin such as polyethylene so as not to damage the photosensitive drum D.

(6) Drive mechanism for the developing sleeve, etc. (Figures 4, 10 to 13) It is better to stop the developing sleeve 1, etc., except when necessary. However, as shown in the example device in Figures 1 and 2, the sleeve gear GS
In the configuration in which the is driven by meshing with the drum gear ()D,
While the drum D is rotating, the sleeve 100 is also constantly 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.

Furthermore, in a copying machine that automatically controls the potential by measuring the charged state of the drum D, toner adheres to that area and is consumed or scattered when measuring the potential of solid black, so it is also useful from the point of view of resource conservation. I don't like it.

Therefore, the developing device of this embodiment is configured to be able to turn on and 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 magnet roller shafts 20 and 23 of the developing sleeve unit and the coat sleeve unit have the tips of the protruding shafts 202 and 232 on the near side connected to the cylindrical shafts 211 and 23 of the front end plates 21 and 24 of each unit, respectively, as shown in FIG. 241 protrudes outward from the tip, and a part of the circumferential surface of each outwardly protruding shaft portion is machined into flat 111 surfaces 203 and 233. Then, the bearing rings 281 and 291 of the support plates 28 and 29, which have the bearing rings 281 and 291 caulked to the lower ends, are fitted onto each of the machined shaft parts, and the push screws 282 and 292 of the bearing rings are screwed in and pressed. By pressing the lower ends of the screws against the machined flat surfaces 203 and 233 of the shafts, the shafts 202 and 233 and the bearing rings 281-291, that is, the support plate 2, are pressed.
8 and 29 are integrally connected, and the upper ends of the support plates 28 and 29 are connected to downwardly bent pieces 91 and 91 formed in series on the front edge of the container box top cover member 90, respectively, as shown in FIG. It is securely fastened with screws 283 and 293.

Therefore, each magnet roller shaft 20, 23 of the developing sleeve unit and coat sleeve unit, that is, each magnet)
The o-ra 3 and 4 are held fixed (non-rotating).

On the other hand, the developing sleep unit, coat sleeve unit,
An electromagnetic spring C1, a coated sleeve gear G4, and a screw shaft gear G5 are fixed to the outwardly protruding shaft portion of the mold box back side plate 5 of the screw shaft 14, respectively.

The electromagnetic spring clutch unit Cl includes a clutch shaft 30, an electromagnetic section 31 attached to one end thereof, a transmission gear G2 press-fitted into the shaft 30 at the other end, and the electromagnetic section 31 and transmission gear G2. It consists of a developing sleeve gear G1 loosely fitted to the shaft 30 in between, and a transmission gear G3 of the clutch shaft 30.
Insert the tip of the side into the tip of the outwardly protruding shaft 191 of the back side plate 5 of the mold box of the developing sleeve unit, and then use the pin 32 to connect the gear G2.
are integrated and rotatably connected. Further, the electromagnetic part 31 is held by the back side plate 5 of the container box to prevent rotation through a plunket 33 and a set screw 34.

The developing sleeve gear G1 meshes with a drum gear GD that rotationally drives the drum D. Transmission gear G2 is idler gear 03
It meshes with coat sleeve gear 04 via. The coat sleeve gear G4 and the screw shaft gear ( ) 5 are directly meshed with each other (FIGS. 11 to 13).

In the electromagnetic clutch unit Cl, when the electromagnetic part 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 locks the developing sleeve gear G1. 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 G1 side and the engagement is released, and the gear 01 becomes free to rotate with respect to the clutch shaft 30 (clutch-off).

When the clutch is off, even if the developing sleeve gear G1 is rotationally driven as the drum gear OD rotates, the gear 01
The clutch shaft 30 idles, no rotational force is transmitted to the shaft 30, and the gear train from gear 02 to gear 054 does not rotate. That is, neither the developing sleeve, the coating sleeve 2, nor the screw shaft 14 is driven to rotate.

When the clutch is on, the developing sleeve gear G1 is coupled and integrated with the clutch shaft 30, so the rotation of the drum gear GD causes the gear G, the clutch shaft 30, the transmission gear G2, and the shaft 191 to rotate together, and the developing sleeve gear G1 is connected to the clutch shaft 30. Sleeve 1 becomes rotationally driven.

The direction of rotation is clockwise in FIG.

The rotation of the transmission gear 02 is also transmitted to the coat sleeve gear 04 via the idler gear (1:3), 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.

Since the screw shaft gear 05 is engaged with the K coat sleeve gear G4, the screw shaft 14 is driven to rotate counterclockwise, and an appropriate amount of toner is sequentially replenished from the replenishment toner supply chamber 61 to the mold box toner storage section. Supplied.

Here, since the unusual developing device is of a so-called jumping developing type, the circumferential speed of the photosensitive drum D is the same as that of the developing sleeve 1.
The circumferential speed completely matches the peripheral speed at a portion dc (the gap between the drum D and the developing sleeve 1) away from the outer diameter of the developing sleeve 1. To give specific figures, the outer diameter of the developing sleeve 1 is 32.4%,
The distance dc between the drum D and the developing sleeve 1 is 0.3%, the diameter of the drum D is 16 o, the number of teeth of the drum gear GD is 160, and the number of teeth of the developing sleeve gear G1 is 33. With this value, the apparent circumferential speed of the developing sleeve 1 is 0.0% relative to the circumferential speed of the drum D.
Although the ratio is 98, the ratio is 0 from the surface of the developing sleeve 10.
．． At a distance of 3%, this ratio becomes 1.

The circumferential speed of the coat sleeve 2 is such that the toner thin layer (50 to 100μ) required for jumping development on the surface of the development sleeve 1
It is sufficient if enough toner can be supplied to form a toner of approximately 25% of the circumferential speed of the developing sleeve 1. In order to reduce the difference in the toner coverage with the remaining toner area, it is necessary to use a toner brush on the coat sleeve 2 to flick the toner on the developing sleeve 1, that is, a magnetic brush developing action is required, and it is preferable. It is preferable that the circumferential speed is about 75 inches. Of course, the faster it lasts, for example, the same circumferential speed is fine, but the single-component toner used in the non-developing method has weak tribo, and forms a nearly 1% long brush on the coat sleeve 2, which easily scatters when rotated at high speed. It is preferable to rotate at such a slow speed that the difference in the toner coverage is substantially negligible. This rotational speed was approximately 50 to 100 inches, although it depended on the amount of tribo and the circumferential speed of the developing sleeve.

In the developing device of this example, the ratio of the developing sleeve G1 to the transmission gear G2 is approximately 1:0.75, specifically, 33 teeth and 25 teeth to achieve the above peripheral speed.

The clutch C1 is an example of an electromagnetic spring clutch, but if the diameter of the clutch C1 is large, it may get in the way, so an electromagnetic spring clutch that is small and capable of transmitting high torque is suitable.

As described above, the clutch unit C1 can be assembled to the developing sleeve unit by a simple method such as connecting the shafts 30 and 191 to each other with the fitting pins 32.

With the above drive system configuration, the developing device can be freely controlled to be driven and stopped. Furthermore, the two sleeves 2Q speed can be driven at an appropriate rotational speed with an extremely simple drive system.

35 in Figures 4 and 13 is the drum gear GD, drum, and drum D.
A connecting pin that engages with the side plate D1 of the figure is shown.

(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
The circumferential surface area L2 and T where 2 and 24 are fitted is an area where there is no magnet roll 4 inside, so it is weak to hold the toner, so there is no magnet roll 4 inside.
The triboelectricity is weaker than in the peripheral surface area where the drum D is present, and the behavior of the toner when the developing sleeve 1 finally develops the drum D differs. Specifically, different densities are developed for the same latent image potential on the zero surface of the drum.

Further, since the force of magnetically attracting toner is weak, toner tends to scatter in this area as the coat sleeve 2 rotates. Further, the thickness of the toner transferred onto the developing sleeve 1 tends to be thicker than the central portion, which causes various inconveniences when performing jumping development. For example, the toner may be crushed between the drum D and the developing sleeve 1, or a layer of dense toner may be formed on the drum. Also, even in the circumferential area where the magnet roll 4 is located inside, the end portion, that is, the fourth
In the region L3 in the figure, the magnetic force is strong in that part due to the nature of the magnet. Therefore, the internal magnet).

'-Not implemented due to cost and variation in characteristics.

When a non-magnetic material is used as the blade 12, the behavior of the toner is unlikely to differ significantly between the longitudinal middle □ central region of the circumferential surface of the coat sleeve 2 and this 1.3 region, but if a magnetic material such as iron is used as the blade, 12, a single layer of toner will be formed in this area, much more than in the center.

Therefore, the developing device of this example has been devised to solve the above-mentioned problems. That is, the length L5 of the magnet roll 3 in the developing sleeve 1 is set to be slightly longer than the maximum copy paper medium LP, and the length L4 of the magnet roll 4 in the coat sleeve 2 is further set to be slightly longer than that. do. Furthermore, both end peripheral surface areas L2 of the coat sleeve 2
- Provide scoop members 26, 26 that are in light contact with L2, or spaced apart by about 0 to 0.5%, and that match the end face of the magnet roll 4 inside the sleeve 2, or that fit slightly inside.

With this configuration, due to the presence of the rake material Taro 26 around both ends of the coat sleeve 20, no single layer of toner is formed or an extremely thin layer is formed, and the sleeve surface between them has completely matched properties such as tribo. Since only the toner that is
Good over the entire range. Also scooping member 26, 26
Therefore, there is no possibility that the toner pushed from behind will leak out to both ends of the coat sleeve 2 through the circumferential areas L2 and L2 where the magnet roll 4 is not present inside the coat sleeve 2.

In the example shown in FIG. 4, the toner scooping members 26, 26 and the blade 12 are configured as separate members, and when assembled, they are aligned with the diagonally bent portion 8b of the Nisty 8 using screws 121, 121. However, as shown in FIG. 4A, the front edges of both ends of the blade 12 may be formed into projecting edges, and the projecting edges may be used as the above-mentioned toner scooping members 26.

(8) Applying bias to the developing sleeve, etc. (3rd degree 4th
．． 10, 12, and 13) It is known to apply an alternating current bias with a superimposed direct current to the developing sleeve 1 in order to improve development performance, particularly gradation and image density using a one-component developer. However, as the image forming speed increases, the level of applied direct current and alternating current and the frequency of alternating current must be increased accordingly.5. Otherwise, the effect of applying bias will not be seen. Specifically, when the process speed is 120%, a proper image is obtained with DC component + 300 cm, AC molecule 500 V, and AC frequency 200 H2.

However, when the process speed was 330%, the DC component +
650/AC minute ±100OV, AC frequency 550 H2
It will require.

However, when such a high potential bias is applied, each part of the device must be made of electrically insulating resin or a creepage distance must be maintained to prevent leakage.

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 type box. This is because the toner in the developing device is in contact with the biased wall of the container, and the above-mentioned tripod occurs.
This is because the toner may deteriorate in quality.

Further, since a high potential bias is applied to the developing sleeve 1, the electromagnetic clutch C1 must have a withstand voltage of about 2000 V or the clutch coil may suffer from poor insulation. Also, such a high voltage electromagnetic clutch CI! They are not normally commercially available, are extremely expensive and large, and have drawbacks such as being difficult to manufacture that meet the standards for 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 plate 5 and the front side plate 6 of the developing device type box. - The lower stayer is made of an insulating material such as resin so that the developing sleeve unit, coat sleeve unit, blade 12, and screw shaft 14 are kept insulated from each other. The lower stayer may be made of a metal plate, but in that case it should be electrically floated or grounded.

One end plate on the back side of the developing sleeve unit is the shaft portion 191
The entire assembly, including the parts, is made of a resin phase such as 'ABS-PC' or other insulating material, and the clutch M30t-pin 32 of the electromagnetic clutch unit Cl is connected to the shaft portion 191 of the clutch.

Therefore, in the apparatus of this example, a bias is applied to the developing sleeve coat sleeve 2 and the plate toy 2.
As an application means, the top cover member 9 of the container box is made of a conductive material, and the cover member 9 is connected to the power supply terminal 36 (12th and 1st
3) to apply a bias voltage (the power supply path to the terminal 36 will be explained in the next section). Then, the developing sleeve 1 is connected to the support plate 28 and the bearing ring' made of a conductive material through the bent piece 91 (FIG. 10) of the upper cover member 9.
281, shaft 202, bearing 212, end plate 21 path (first
0 to 4), and to the Coats IJ Hp 2, through the bent piece 91 of the upper cover member 9, the following supports plate 29, bearing ring 291, shaft 232, bearing 242, and end plate made of conductive material are attached. A 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.

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.
C1 is electrically protected.

By using the top cover member 9 as an electric path as described above, for example, the presence of long cords and the hassle of wiring can be avoided when the power supply cord is stretched to each part that requires bias application. The structure is simple and rational.

Since no bias is applied to the side plates 5 and 6 of the developing device type box and the lower stayer, problems such as toner tribodistribution and toner deterioration do not occur.

Note that the magnetic roller shaft support plates 28 and 29 of the developing sleeve 1 and coat sleeve 2 are connected to the blade support stay 8.
It may be configured such that a bias is applied to the sleeve 2 and the blade 12 by coupling them together and applying a bias to the stay 8.

(9) Attaching the developing device to the copying machine (11th to 1st
(Figure 5) This example device is 1.During the process of loading and unloading into the copying machine, damage to the photosensitive drum 0 surface by the loading/unloading developing device (C) is strictly prevented from being scratched or pressed.

11 In the jumping development type developing device, the gap dc between the developing sleeve 1 and the drum D must always be maintained at a specified distance of about 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 D as in the conventional developing device. Therefore, even if the drum D has eccentric rotation or irregularities, the predetermined gap dc that should be maintained between the drum D and the developing sleeve 1 is always maintained by causing the developing device to naturally oscillate in accordance with the eccentric rotation or irregularities. When the developing device is installed and removed, the electrical circuits between the copying machine main unit side and the developing device side are automatically connected and disconnected as the developing device is installed and removed. We have added some ideas to eliminate the hassle and hassle of plugging and unplugging electrical connectors each time you plug or unplug the connector, and to eliminate the problem of forgetting to plug or unplug the connector.

First, the mounting structure of the developing device on the copying machine will be explained. In Fig. 13, 37 and 38 are the rear and front plates of the chassis of the copying machine, and the drum D is attached to these side plates 3.
The bearing is held between 7 and 38 so that it can rotate freely. D2 indicates the drum axis.

Regarding the chassis front side plate 38, a developing device insertion opening 381 is formed at a portion corresponding to the developing device mounting position relative to the drum D. Further, a developing device pedestal 39 (FIGS. 14 and 15) is disposed between the rear side plate 37 and the front side plate 38 of the chassis at the opening portion.

A groove rail 391 is formed along the longitudinal direction of the front side of the pedestal 39 on the drum D side. On the other hand, as for the block image device, downward protrusions 53 and 63 are formed on the lower sides 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 rails 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 front side plate 38, with the rear side first, and insert the developing device box as shown in Figure M14. The groove rail 391 of the pedestal 39
At the same time, the lower side 54 of the back side plate 5 on the side opposite to the downward protrusion 53 is received on the pedestal 39. As a result, the developing device is tilted toward the rear with respect to the drum D around the downward protrusion 53, and the front side of the developing device is in a state of being largely separated from the drum D. Then, in this posture, the entire developing device is slid on the pedestal 39 and the groove rail 391 and pushed into the main body of the copying machine. Once the downward protrusion 63 on the front side plate 6 of the developing device is positioned corresponding to the grooved rail portion 391, the protrusion 63 is fitted into the rail 391 and the developing device is further pushed in. Finally, the downward protrusion 63 on the front side plate 6 of the developing device box is pushed in. An electric circuit connector 40 (first
1 to 13) is inserted into the corresponding connector 41 provided on the rear side plate 37 of the chassis of the copying machine, and is fully inserted until it is received by the stopper plate 42.

During this push-insertion process of the developing device, the front side of the developing device is in a posture far away from the photosensitive drum D as described above, so that the drum surface 0 & the current @ three gear Gl-? This prevents the drum surface from being scratched by the spacer rollers 27, 27.

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 developing device will be stuck in the chain shown in FIG. As shown in Figure 14, the chassis front plate 38
The development device insertion opening edge 382 (partially overhanging edge) interferes with the developing device insertion opening edge 382 (partially overhanging edge) and prevents rotation, so that the developing sleeve gear G1 and spacer roller 27 do not come into contact with the drum 0 surface. This is to ensure strict protection.

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 relationship between the front edge of the upper cover part of the developing device and the opening edge 3'82 of the front side plate 38g of the developing device, and the entire developing device is A raising operation centered on the groove rail engaging protrusions 53 and 63 is possible.

14-15, 43 is the operating mechanism for raising the developing device, 431 is a shaft that rotates forward and reverse by operating an operating lever not shown in the figure, and 433 is a bracket 43 attached to the shaft 431.
The U-shaped bracket 434 is fixedly supported through the U-shaped bracket 2, and 434 is a reciprocating rod that is slidably supported on both legs of the U-shaped bracket. A coil spring 436 compressed between the rear leg pieces of the letter-shaped metal fitting 433 constantly urges the metal fitting 433 to protrude forward. 437 is advance/retreat rod 43
This is a suppressor formed at the tip of 4. The member mechanisms from the bracket 432 to the suppressor 437 described above are provided at two locations on the back side and the front side of the shaft 431.

On the other hand, projections 55 (the front plate 6 side is not shown) corresponding to the pressers 437 of each of the mechanisms described above are formed at the inner rear parts of the rear side plate 5 and front side plate 6 of the developing device.

When inserting the developing device into the copying machine, use a lever to rotate the shaft 431 counterclockwise 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.

When the developing device is fully inserted and the connector 40 is fitted into the connector 41 and is received by the stopper 42, the shaft 431 is rotated clockwise by operating the lever. Then, during the rotation process, the pusher 437 of the device raising mechanism 43 hits the corresponding protrusion 55 on the developing device side. After that, when the shaft 431 is rotated against the resistance of the developing device's weight I11 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 moves diagonally toward the protrusion 55. Crawl downwards. As a result, the reaction force of the spring 436 acts on the developing device through the protrusion 55 to push up the developing device, and the entire developing device moves clockwise around the downward protrusions 53 and 63 that are engaged with the groove rails 391 of the pedestal 39. The spacer rollers 27 and 27 come into contact with both end surfaces of the drum [ ) as shown in FIGS. 13 and 15, and the developing sleeve gear G1 is brought into mesh with the drum gear GD. The raised state of the developing device is maintained by the mechanism 43 rotated around the shaft 431, by the operating lever of the shaft 431 returning past the dead center, 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 436, and the spacer rollers 27 and 27 are always kept in contact with the drum D.
A predetermined clearance interval dc is maintained between the two. In this case, even if there is eccentric rotation on the drum D or there are irregularities on the drum D, the cushioning action of the spring 436 allows the entire developing device to protrude downward while maintaining the contact of the rollers 27 and 27 with the surface of the drum 9. A predetermined clearance dC between the developing sleeve 1 and the drum D is ensured by following the swinging movement about the drums 53 and 63.

The rotational force for raising the developing device by the spring 435 is converted into the force F (Fig. 15) of the rollers 27 and 27 hitting the drum D, which is 1.
About KP is enough. If this force F is small, the rotation of the drum D will be uneven and the ability to follow irregularities will be poor; if it is large, the roller 2
7 and 27 strongly press against drum D, damaging drum D.

Alternatively, the screw 435 can be compressed considerably and attached to the metal fitting 4.
33+ is closed, so that even if it bends a lot, the pressing force will not change much. In other words, the free length is the metal fitting 433
It is set by compressing something that is much longer than the length between the two legs. This reduces push/pressure changes even with large deflections, and allows for a compact design with a small spring constant.

Next, the electric circuit connectors 40 and 41 will be explained (mainly shown in FIG. 12). The connector 40 on the developing device side is fixedly attached and held on the outer surface of the back side plate 5 of the developing device mold box via arm members 401.
The remaining toner +tt is attached to the bias application power supply terminal 36 of the upper cover 9, the electromagnetic clutch C1, and the lower steerer.
A sensor unit S for detection etc. (FIGS. 12 and 3) is connected by a wire 402.

The connector 41 on the main side of the copying machine is connected to the control circuit section 411 of the main machine, and is rotated vertically about a shaft 412 on the side of the back side plate 37 of the main machine chassis opposite to the developing device side. The free swing plate 413 is attached and held. The front side of the connector faces the inside of the rear side plate 37 through a window hole 371 formed in the rear side plate 37 of the chassis. The swing center axis 412 of the swing plate 413 is the swing center axis of the developing device inserted into the copying machine, that is, the extension line of the shaft sail connecting the downward protrusions 53 and 63 fitted in the groove rail 391 and the axis. They are arranged to match.

Swing plate 413 p1! All'7. A protrusion 414 is provided at the bottom of the end opposite to the shaft 412 of the "jl", and the receiver is stopped by the bent protrusion 421 of the stopper plate 42 fixed to the chassis rear side plate 37. Swing plate 41
3, and a light tension spring 415 is stretched between the oscillating plate 413 and the stopper plate 42 so that the oscillating plate 4
13 is rotated downward around the shaft 412 and pressed against the protrusion 421-A 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 pin receiving hole 416.4 of the connector 41 on the main unit side
1'6K is inserted, and the subsequent insertion movement of the developing device causes the connector 40 to smoothly fit into the connector 41 and become connected, and at the same time, the connector 4o is received by the stopper 42 to prevent further development devices from being inserted. The push-insertion is blocked and it is recognized that the developing device has reached its final insertion position. Therefore, as explained in FIGS. 14 and 15 above, the shaft 43
1, the mechanism 43 raises and rotates the developing device clockwise around the downward protrusions 53 and 63 to bring the spacer rollers 27 and 27 into contact with the photosensitive drum D, and at the same time, moves the developing sleeve gear G1 to the drum gear 01). By bringing the developing device into the engaged state and maintaining that state, installation of the developing device to the machine is completed.

In this case, since the axis connecting the protrusions 53 and 63, which is the swing axis of the developing device, and the axis of the swing center shaft 412 of the swing plate 413 that supports the connector 41 are aligned, the above-mentioned upright rotation of the developing device At the same time, the connector 41 on the machine side also maintains its connection with the connector 40 on the developing device side, and rotates together with the rocking plate 413 effortlessly about the shaft 412 against the light tension spring 415 to connect the connectors 40 and 41. There is no problem in mutual connection. Furthermore, as described above, even if the developing device follows and swings around the protrusions 53 and 63 due to the eccentric rotation and unevenness of the drum D, the swing plate 413 also follows and swings accordingly. does not cause any hindrance to mutual connection.

Note that there may be some play (for example, about 1%) between the shaft 412 and the swing plate 413. Connector 4 on the developing device side
0 may be configured to freely swing around the center of swing of the developing device.

Extracting the developing device once installed Vi first enclosure shaft 4
31 counterclockwise by lever operation, the developing device raising mechanism 43 is released and rotated outward as shown in FIG. 14, thereby releasing the pushing up force on the developing device. Then, the entire developing device rotates counterclockwise around the downward protrusions due to its own weight, and the rear lower sides 54 and 64 come into contact with the top of the pedestal 39, and the entire developing device rotates around the downward protrusions 53 and 64 as shown in FIG. 2775E on the front side of the apparatus, and the developing sleeve gear G1 separates from the drum gear GD. Thereafter, the developing device in the downwardly inclined position is pulled toward the front side while keeping the developing device in that position. This pull causes connector 4.

The fitting engagement with the same 41 will be released naturally. - Then, by further pulling the developing device towards you, the chassis - front side plate 38
A mouthful 381 of the liquid is taken out of the machine.

Even in the process of extracting the developing device, since the front part of the developing device is largely separated from the zero surface of the drum, there is no scratching damage to the zero surface of the drum caused by the spacers O27 and 27 and the gear G1. Also, in this extraction process, even if the developing device is raised centering on the downward protrusions 53 and 63, the upper cover 9 of the developing device is removed as in the case of the developing device insertion process described above.
The front edge of the developing device interferes with the chassis front plate opening edge 382 to prevent rotation of the developing device, thereby preventing the spacer roller 27φ27 and the gear G1 from contacting the zero surface of the drum.

Further, even if the developing device is pulled and operated without releasing the suppression of the developing device by the mechanism 43, the pressing force of the mechanism 43 and the interference between the front side plate 6 of the developing device and the inside of the opening edge 382Q of the chassis front side plate 38 (13th (Figure) prevents the developing device from coming out.

(10) Other configuration examples of the life sleeve unit and the coat sleeve unit (Fig. 16) In the developing device of the example shown in Fig. 4, in order to remove the developing sleeve unit for maintenance etc., the shafts 191 on both ends thereof are used.
@211 to electromagnetic clutch C1゜spacer roller 27.2
7, and then one or both bearing members 111 are removed from the mold box 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 that both sleeves 2 are removed. The toner in between is caught between them and aggregates. As a result, a large lump of toner may form and fuse onto the sleeve, or the lump may form on the blade 12.
This may lead to troubles such as getting caught between the coat sleeve 2 and the coat sleeve 2.

An example of a structure that improves this point is shown in FIG. 16. That is, the 16th
In the illustrated example, the diameters R, 2 of the end portions 2a, 2a of the coat sleeve 2, that is, the regions L2, L2 where no single layer of toner is formed, are made thicker, and both end portions of the blade 12 are provided in contact with these portions. Here, there is a step (Ft
2-R1)/2 is the desired length of the brush ear. If the blades 12 are made approximately equal to each other, there is no need to remove the position of the blade 12 for maintenance or readjust it each time it is installed. (R,2-Rl)/2 1d Generally 0.1~
It is set to about 0.5 mm. Also, coat sleeve 2
Since the brush ears are formed only in a certain area of the magnet 4 inside the toner, only toner with matching properties such as toner triboform forms a single layer of toner, so when this toner is transferred to the developing sleeve 1, it is evenly thin. A layer is formed. Furthermore, the toner does not accumulate on the outer end surface of the step, thereby shortening the life of the bearing or causing it to scatter. Even if the bearing members 111, 111 in the developing sleeve partial area are removed, the two sleeves 1, 2 will come close to each other due to the presence of the large diameter portions 2a, 2a of the coat sleeve 2 and the presence of the rings 1a, 18 described below. It has many advantages such as there is no need to worry about toner fusing or clumping because there is no toner. Using the same concept, insulating resin rings 1a, 1a made of polyethylene resin, etc., are press-fitted into the ends of the developing sleeve 1, and the photosensitive drum D
It can also act as a Vl spacer to ensure a predetermined clearance dc between the developing sleeve 1 and the developing sleeve 1. That is, the spacer rings 1a are press-fitted into both ends of the developing sleeve 10 so as to form a step dc. To give concrete numerical values, the level difference d a of the coat sleeve 2 is about 0.8%, and the level difference d c of the developing sleeve 1 is about 0.3%. Naturally, the above spacer ring 1a is attached to the developing sleeve 1.
In the configuration in which -1a is provided, the spacer rollers 27-27 in the example shown in FIG. 4 are not required on both sides. Furthermore, the circumferential speeds of the spacer rings 1a, 1a and the drum D are completely the same, and both the developing sleeve 1 side and the drum D side are connected to the gear G1 ().
Since they are connected by a D mesh, there is no risk of slippage occurring between the two and causing wear of the rings 1a, 1a and the drum.

The reason why the spacer rings la and 1a are made of insulating resin is to prevent the drum D from being damaged. As described in item (8), when applying a high potential bias, a thin photoreceptor (generally about 50μ) is placed between the conductor such as aluminum, which is the base of the drum D, and the developing sleeve 10. Since the spacer rings 1a and 1a come into contact with each other and tend to cause problems such as pinholes, another purpose is to prevent such problems.

Also, due to the presence of the spacer rings 1a, when the sleeve 1 is removed from the developing device mold box, the attraction and collision of the sleeve 1 in the direction of the sleeve 2 due to the magnetic force is similar to the protrusions 2a on the coat sleeve 2 side. This is prevented by the action of

In summary, in general, when resetting the developing device after assembly or maintenance, a predetermined toner thickness of 1.5 mm is applied to the surface of the coat sleeve. In order to form a single layer of toner, it is necessary to place the blade approximately t1 away from the coat sleeve 2. If the configuration is as described above, the blade 12 can be easily moved between the large diameter portions 2a and 2a at the ends of the coat sleeve 2. All you have to do is push it down and set it, making adjustment and installation extremely easy. Of course, if a magnetic material is used for the blade 12, the toner,
Since the thickness of each layer is thinner than the distance between the blade 12 and the coat sleeve 20, it is of course necessary to set (R2-FLi)/2 to be greater than the thickness t1 of the toner layer. Because of this structure, even if the developing sleeve is removed for maintenance or the like, the toner layer will be crushed even more, which is not a good idea.

(11) Other configuration examples for applying bias to the developing sleeve, etc. (Figs. 17 to 21) Unlike the example in Fig. 12, the sensor unit S for detecting the remaining amount of toner is not provided, and a bias is simply applied to the developing sleeve, etc. In the case of a developing device having a structure where it is only necessary to provide a connector 40 as shown in FIG. 12, it is not necessary to provide a connector 40 as shown in FIG. 12, but as shown in FIG. A part of the rear side thereof is extended to protrude 92, and a power supply plate spring terminal 441 is provided on the side of the copying machine which comes into contact with the protruding extension 92 of the αα surface cover member when the developing device is inserted and mounted. You can configure it. 44 indicates a high voltage transformer (HVT) that supplies power to the leaf spring terminal 441.

In this way, the connector 40-4 as shown in FIG.
1. The wiring 402-411, the swing plate 413, etc. are no longer necessary, and the configuration is extremely simplified.

In addition, in the example shown in FIG. 12, as explained in item (8) above, the upper cover member 9 is used as a power supply path, and the magnet o-ra shaft fixing support plates 28 and 29 (see FIG. ), the bias is applied to the developing sleeve 2 and the blade 12 ((bias is applied An example configured to do so is shown below.

That is, the shafts 191 and 221 on the driving side, that is, the rear side, of the developing sleeve unit and the coat sleeve unit are attached to the rear side plate (insulating material) of the developing device barrel 5 using metal support plates 451 and 46, respectively.
It is supported by bearings via ball bearings 45 and 46 (Fig. 21). The upper ends of each of the pole bearing support plates 451 and 461 are bent downward into tongue portions 93 and 94 formed on the back side of the upper cover member 9 of the developing device.
Fasten screws 452 and 462, respectively. The end plates (7/J) 19 and 22 on the driving side, that is, on the back side, of the developing sleeve unit and the coat sleeve unit are made of conductive material (the electromagnetic clutch unit cl is electrically closed to the shaft 191). (insulated 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 described above.

The developing sleeve 1 includes a high voltage transformer 44 → a leaf spring terminal 441 → an upper cover member 9 → its bent tongue piece 93 →
Bearing support plate 451 → bearing 45 → shaft 191 →
In the path of the end plate 19, the coat sleeve 2 has an upper cover member 9, its bent tongue piece 95, and a bearing support plate 461.
→Bear ring 46 → shaft 221 → end plate 22 path, and upper cover member 9 on blade 12 → screw it 13
A bias of the same potential is applied to each of the developing device containers through the upper stay 8 made of a conductive material.

In the above, although the ball bearings 45 and 46 are respectively used as power supply paths, 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 a power supply path. ) It is extremely effective to use the back side power feeding method compared to the front side power feeding method of the developing device explained in section 2.).Also, feeding power from the high voltage transformer 44 to the upper cover 9 is a little troublesome due to the wiring operation, but it is a high voltage Transformer 44 and upper cover YR
9 and call r47.9 as shown by the chain line in Figure Po. Connect 1
4B and the connector 49 of the high voltage transformer 44 to supply power.

Also, the bearing support metal members 451 and 4 of the developing sleeve 1 and coat sleeve 2 are connected to the blade support stage 8.
61 and applying a bias to the stay 8 thereof, a bias may be applied to the sleeve 2 and the blade 12.

As explained above, the illustrated example device has various improvements made to its parts, but there are some special features.
(Full image recorder O double zero machine book 4111k
The constituent parts of h@ for this are made of five layers of clay.

That is, the guide members 591-55 for guiding the developing device into the main body of the copying machine
-65, the scissors are inserted approximately parallel to the image bearing member plate, and with the tip of the guide part and is configured so that by raising the device at the insertion end point i, it takes a normal facing attitude toward the f11* supported material,
An electrical enclosure connector 40 which is inserted and fitted between the example of the image device and the main side of the copying machine by inserting the upper part of the developer tray O.
41 is established.

One of the connectors is fixed, and the other connector is attached to a VC that freely moves slowly around the center of swing of the upper image device O.

With the above configuration, as explained in Section M.

During the process of loading and unloading the developing device into the copying machine, damage to the developing device is strictly prevented. The circuit connection/disconnection between the developing device and the copying machine is automatically performed as the developing device is installed and removed. By holding the raised and raised state in a normal facing position with respect to the drum D by the cushion spring 466, even if there is an uneven force on the eccentric circumferential rotation of the dotem DK, the developing device 4h swings to follow it. As a result, drum D and composition II
& The predetermined gap distance d@ to be maintained between the front and the front sides is maintained. In this case, since one of the electrical circuit connectors 40 and 41 is also free to swing around the center of swing of the developing device, no strain is caused to the joint connectors 40 and 41.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of an example of a developing device using a one-component developer, FIG. 2 is a perspective view of a developing sleeve of the device and a drum as a member to be developed, and FIG. 3 is an embodiment of the present invention. A cross-sectional side view of the example device, FIG. 4 is a longitudinal section cut-out reduction along the line rV-rV in the diagram, and FIG. 4A is a plan view of a modified example of the blade.
FIG. 5 is a perspective view of the developing device type box, and FIG. 6(a) is an inner view of the back side plate of the container. Figure 9 (b) is an external view of the front plate, Figures 7 and 8 are explanatory diagrams showing how to assemble the coat sleeve unit and developing sleeve unit to the container, and Figure 9 (a) is the back of the conventional box. The inner view of the side plate, (b) is the outer view of the front plate, (c)
) 1- is an inner view of a modified example of the rear side plate, Figure 10 is an external view of the front plate side of the developing device shown in Figure 4, Figure 11 is an external view of the rear side plate, and Figure 12 is the rear view of the developing device A perspective view of the electric circuit connector and stopper portion on the side plate side and the main copying machine side, FIG. 13 is a plan view of the developing device installed in the main copying machine, and FIG. FIG. 3 is a cross-sectional side view of the developing device in a rearward downward position before being rotated. FIG. 15 is a cross-sectional side view of the developing device in a state where it has been raised and rotated so that the spacer rollers are in contact with the drum surface, FIG. 16 is a longitudinal developed plan view of a modification of the device shown in FIG. 4, and FIG.
The figure shows a developing device installed in a copying machine in which bias power is supplied to the top cover member of the developing device by contacting the spring plate terminal on the high-voltage transformer side with the extended protrusion of the developing device. The plan view of the device, FIG. 18 to FIG. 21, shows the configuration of an example in which bias is applied to the developing sleeve, coat sleeve, etc. from the back side plate of the device cylinder. FIG. 19 is an external view of the back side plate. FIG. 20 is a plan view of the rear side plate of the developing device, and FIG. 21 is a perspective view of the bearing portion. 1 is a developing sleeve, 2 is a coat sleeve, 4 is a magnet roll inside those sleeves, D is a drum, 12
is a non-magnetic blade. Patent applicant Fuku Hitoshi, representative of Canon Co., Ltd. 1) Kandai 2
Ward 05 No. A O Map $45 Country

Claims (1)

[Claims] 413 Gentle t&wax is attacked by the internal materials of the system 1
N# The statue was almost parallel to the Zheng material, and the car was placed in the 11th #
The tilt is inserted with nine flames 111 in the direction from the direction of the material to the material direction, with the material inside the upper base as the center, and at the point of insertion M, by turning it exactly wt') - image 81! Electric enclosure connectors are provided on the imaging device side and the copying machine side, which are inserted into each other when the developing device is inserted as described above, and one of the connectors is fixed. The other connector is attached to the m1lli self-mounted with the 0-oscillation center of the above-mentioned image device as the center, and it is the same as the Kaede-1. (2) - Acupuncture needle t that takes a positive posture against the image-bearing S material
li, m strain state t Cushion was made to break through the shoulder spring. The development device of the thief in the patent d request O fan acupuncture tlj section. (3) The connector provided with the far-free VC is always biased to a position directly facing the other connector when inserted. A developing device according to claim (1).