JPS60229072A - Developing device - Google Patents

Abstract

PURPOSE:To perform attachment to and detachment from a part to be fitted so that a color change, etc., are made easily by releasing the locking operation of a lock means which fixed a developing device to the part to be fitted associatively with the displacing operation of a grip. CONSTITUTION:The 1st developing unit 52 which contains a color developer 56a is a cartridge type attachable to and detachable from the fitted part 1a of a main device body 1, and easily detached by being lifted while the grip 155 consisting of a handle is raised. When the grip 155 is raised, a hook 158 disengages from a lock pin 159 and when the grip 155 is fallen down in a nearly horizontal state, the hook 158 engages the lock pin 159; when the grip is further pressed down below the horizontal position, the hook 158 engages the lock pin 159 securely so that the developing unit 52 is pressed down. For the purpose, the grip 155 is raised and then fallen down after the 1st developing unit 52 is inserted, thereby fixing the 1st developing unit 52 extremely easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a developing device applicable to, for example, a copying machine.

[Technical background of the invention and its problems]

2. Description of the Related Art In recent years, color copying machines and the like have progressed, and two-color color copying machines and the like that can produce images in colors other than black have been put into practical use.

On the other hand, in a developing device for this type of copying machine, etc., it is desirable that color exchange can be easily performed, and there is a desire to develop a developing device that can easily handle this change.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a developing device which has a simple structure and which can be easily attached to and detached from an attached part in order to facilitate color exchange, etc. This is what we are trying to provide.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention has a cartridge type that can be freely attached to and detached from the attached part, and is provided with a handle for attaching and detaching, and fixes the developing device to the attached part in conjunction with the displacement movement of this handle. The locking means is configured to be able to release the locking operation, and the attachment/detachment operation can be performed with a one-touch operation using the handle.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a two-color copying machine incorporating the developing device of the present invention. In the figure, 1 is a copying machine main body. A document table 2 that can freely move back and forth is provided, and an operation panel (not shown) is provided on the front edge of the top surface, on which a display, numeric keypad, color selection keys, exposure settings, print keys, etc. are arranged. ing.

Further, a paper feed force jet 3 is attached to the right side of the apparatus main body 1, and a paper discharge tray 4 is attached to the left side. The cassette cover 5 of the paper feed cassette 3 serves as a manual feeding table 6 for manually feeding paper P' as appropriate.

A drum-shaped photoreceptor 7 is arranged approximately in the center of the copying machine main body 1. Around the photoreceptor 7, there is a charging device 8, an optical device 9, a two-color developing device 10 (to be described later), and a transfer device 1.
1, a peeling device 12, a cleaning device 13, and an afterimage erasing device 14 are arranged in this order.

Further, in the lower part of the copying machine main body 1, paper P automatically taken out from the paper feed cassette 3 via the paper feed roller 15 or paper P' manually fed from the manual feed table 6 is placed between the photoreceptor 7 and the transfer device 11. A paper transport path 12 leading to the paper discharge tray 4 via the image transfer section 16t is formed between.

A pair of aligning rollers 18 and 18 are arranged on the upstream side of the image transfer section 16 of the paper conveyance path 17, and a fixing device 19 and two pairs of paper discharge rows 20.20 are arranged on the downstream side.

Further, the optical device 9 has an exposure lamp 22 whose back portion is surrounded by a reflector 21 and a lens mirror system 23. The photoreceptor 7 is driven by a drive mechanism (not shown) in the direction of the arrow in synchronization with the document table 2.

First, the exposure lamp 2 is uniformly charged by the charging device 8.
The original image uniformly illuminated by lens mirror system 2
3 to form an image on the photoreceptor 7 to form an electrostatic latent image. The formed electrostatic latent image is turned into a developer image by the developing device 10 and sent to the transfer device 1 side.

Automatically or manually fed paper P or P' is fed by a pair of aligning rollers 18 and 18, and the developer image previously formed on the photoreceptor 7 is transferred onto the paper P or P' by the transfer device 1. Transcribe. Further, the developer image is peeled off from the photoreceptor 7 by a peeling device 12 using AC corona discharge, passes through a conveyance path 17, and is melted and fixed onto the paper p (p') by a fixing device 19, and is then removed by a pair of paper ejection rollers 20 and 20. It is discharged onto a removable tray 4.

On the other hand, the residual toner remaining on the photoconductor 7 after transferring the developer image onto the paper P (p') is cleaned by the cleaning device 13, and the afterimage erasing device 14 lowers the potential on the photoconductor 7 below a certain level. It is ready for the next copy operation.

Further, a fan as a cooling device is provided inside the apparatus main body 1, and exhausts heat generated by the heat generating section inside the apparatus, the exposure lamp 22, and the fixing device 19. 24 is a power switch, 25 is a door switch, and the main motor 22 is also equipped with an exhaust device 28 in order to cool down the heat generated by the power source 26, etc.
is installed for cooling.

Inside the copying machine main body 1, an upper frame and a lower frame (not shown) are pivotally supported at one end via a support shaft (not shown), and the other ends of both frames are tilted at a desired angle, for example, 30°.
It is configured so that it can be opened to The upper frame includes a charging device 8 and a lens mirror system 2 around the photoreceptor 7.
3. Each device such as an exposure lamp 22, a developing device 10, a cleaning device 13, an afterimage erasing device 14, etc. is installed by appropriate means, a fan as a cooling device, a paper feed roller 15 of a paper feed device, and a document table. 2 is also attached to the upper frame and constitutes an upper unit).The lower frame also includes a paper feed cassette 3, a transfer device 1, a peeling device 12, a guide plate 30 for forming a transport path, a fixing device 19, Paper ejection roller pair 2
0, 20, the tray 4, etc., the main motor 27, the power supply section 26, etc. are attached by appropriate means to form the lower unit.

After rotating and removing the front cover of the copying machine main body 1, almost the paper p (
It is configured so that it can be opened and closed along the conveyance path 17 of p'). Therefore, even if the paper p (p') becomes jammed on the conveyance path 17, it can be easily taken out.

Note that 1B and Ill correct the inclination of the leading edge of the paper P automatically fed from the paper cassette 3 or the paper P' manually fed, and also adjust the timing to the toner image forming operation on the photoreceptor 7. a pair of aligning rollers that feed paper P or P' toward the transfer device 11;
Reference numeral 1 denotes a manual feed detection switch arranged immediately in front of the pair of aligning rollers 18 and 18.

32 is a paper ejection switch, 34 is paper P in the paper feed cassette 3
It is an Eperencity switch that detects when ... is gone.

Further, 35 is a high voltage transformer, 36 is a static elimination brush, and 38 is an auxiliary reflector.

Further, numeral 39 is a Breton renoid that brings the cleaning blade 40 of the cleaning device into and out of contact with the photoreceptor 7 .

As shown in detail in FIG. 2, the developing device 10 has a developing roller 50 as a first developing member and a developing roller 25 as a second developing member. When driven, a copy of black or one other color such as red, yellow, blue, green, etc. can be obtained.

The developing device 10 also includes a first developing row 250 .
The second developing unit 53 including the second developing roller 51 is divided into a developing unit 52 and a second developing unit 53 including the second developing roller 51. The first developing unit 52 is configured to be pulled out upward in the figure. The frequently used black developer is used in the lower second developing unit 53, and the color developer is used in the upper first developing unit 52.

The first developing unit 52 includes a developing mechanism section 54 and a developer replenishing section 55, and the developing mechanism section 54 includes a developing roller 50 and a developer magnetic brush 56 formed on the surface of the developing row 250. A developer magnetic brush 56 is provided upstream of the sliding contact portion with the photoreceptor 7, that is, the development position 57.
a scraper 60 provided on the downstream side of the developing position 57 that scrapes off the developer magnetic brush 56 on the surface of the developing row 250 and guides it to the developer storage section 59; The developer agitator 61 is housed in the section 59 and the developer agitator 61 is housed in the T casing 62.

A developer concentration detector 63 is attached to the casing 62 at a position above the developing roller 50 to detect the developer concentration by magnetically detecting changes in the magnetic permeability of the developer 56a. There is.

Further, the developing roller 50 is a magnetic roll provided so that its center is located above a straight line that passes through the rotation center of the photoreceptor 7 and forms an angle α (α-51°) with respect to the horizontal line. 64, and a sleeve 65 that is fitted onto the magnetic roll 64 and rotates clockwise in the figure.

Moreover, the magnetic roll 64 has five magnetic pole parts 66h to 66m. Third. Fifth magnetic pole portion 66a.

55c and 66e are N poles, 2nd. Fourth magnetic pole portion 66b, 6
6d is the S pole, and the angle θ□ between the first magnetic pole part 66m and the second magnetic pole part 66b is θ,=56';
The angle θ between the magnetic pole part 66b and the third magnetic pole part 66c,
is θ, = 71°, the third magnetic pole portion 66e and the fourth magnetic pole portion 6
6d, the angle θ is θ3=60°, and the fourth magnetic pole part 6
The angle θ4 between 6d and the fifth magnetic pole portion 66e is θ4=6.
They are each set to 0°.

Further, the developer replenishing section 55 has a developer replenishing port 67 facing the developer storage section 59 of the developing mechanism section 54.
A developer replenishment roller 69 is provided in the hopper 468 and closes the developer replenishment port 67, and the developer in the hopper 68 is conveyed to the developer replenishment row 269 side. The structure includes a pair of stirring rollers 10 and 70 for stirring 56 m.

The second developing unit 53 has almost the same basic configuration as the first developing unit 52 described above, and has the shape of the hopper 68' of the developer replenishing section 55' and the magnetic pole of the magnetic roll 64' of the developing row 251. The differences include the arrangement structure, the mounting position of the developer concentration detector 63', and the addition of a second scraper 80 which is narrow (about 50+ m) and has an inclination of approximately 20 degrees. Other identical components are given the same reference numerals with dashes, and detailed explanations will be omitted.

The magnetic roll 64'ld of the developing row 25 has four magnetic pole parts 66'h to 66'd. The third magnetic pole parts 66'h and 66'c are N poles, and the second magnetic pole parts 66'h and 66'c are N poles. Fourth magnetic pole part 6
6'b and 66'd are S poles, and the angle θ5 between the first magnetic pole part 66'a and the second magnetic pole part 66'b is θ,=78°, and the second magnetic pole The angle θ6 between the portion 66'b and the third magnetic pole portion 66'C is θ6=70°, and the angle θ6 between the third magnetic pole portion 66'C and the fourth magnetic pole portion 66'd is θ6=70°.
, are set to θ7=80°, respectively. Further, this magnetic roll 64' is a straight line that passes through the center of rotation of the photoreceptor 7 and forms an angle β (β=1°) with respect to the horizontal line L1.

The center is located at the top.

On the other hand, each of the magnetic rolls 64 and 64' of the first developing unit 52 and the second developing unit 53 is configured to be able to rotate at a rotation angle of approximately 25 degrees. Due to the dynamic displacement operation, the developing roller 50
．． Developer magnetic brushes 56 and 56' can be formed and removed on the surface of the first developing unit 52 and the second developing unit 51.
The surface of the developing rollers 64, 64' of either the first developing unit 52 or the second developing unit 53 is changed by switching the magnetic rolls 64, 64' of No. 3 to a predetermined position by a magnetic roll driving means to be described later. Developer magnetic brushes 56, 56' are formed only in the magnetic brushes 56 and 56'.

That is, when operating the first developing unit 52 side, as shown in FIG. The doctor 58 is positioned approximately midway between the first magnetic pole 66h and the second magnetic pole 66b, and the magnetic roll 64' on the second developing unit 53 side is set so that the first magnetic pole 66'a faces the doctor 58'. I'll do what I do. The developer magnetic brush 56 is formed only on the surface of the developing roller 64 on the first developing unit 52 side.

In addition, when operating the second developing unit 53 side, as shown in FIG. 3, the magnetic roll 64 on the first developing unit 52 side is rotated approximately 25 degrees clockwise from the position shown in FIG. The magnetic roll 64 on the second developing unit 53 side faces the first magnetic pole 66mf doctor 58.
'S-Positional force shown in Figure 2 ≧ The doctor 58' is rotated approximately 25 mm to the curved needle snow surface, and the doctor 58' is placed approximately midway between the first magnetic pole 66'a and the second magnetic pole 66'b. Make sure you're in the right position. The developer magnetic brush 56' is formed only on the surface of the developing row 264' on the second developing unit 53 side.

The first magnetic pole 66a of the magnetic rolls 64, 64'.

66'* is a doctor made of non-magnetic material 5B, 5
The reason why the developer magnetic brushes 56, 56' are not formed on the surface of the developing roller 50, 51 when facing B' is as follows.
This is because the magnetic flux density of the magnetic brush with magnetic poles 66m and 66'h is in a state of flux, so the power to attract the developer 56 &56'a is weak, so it can be easily regulated with the doctor 58° 58', and the sleeve 65 , 65' rotates, the developer 5
6a and 56'a do not pass through the doctor portions 5B and 5B'.
The driving force is transmitted through the developer stirring body 61, the developer replenishing roller 69, and a first driving force transmission system 85, which will be described later. Further, each driving section of the second developing unit 53, that is, the sleeve 65' of the developing roller 51,
The developer stirring body 61' is connected to a second driving force transmission system 86 which will be described later.
The driving force is transmitted through the

Above 1st. The second driving force transmission system 85,86 has a configuration as shown in FIGS. Only one of the drive sections of the developing units 52 and 53 is selectively operated. In addition to simplifying the mechanism and reducing the number of parts, unnecessary stirring of the developer 56 IL and 56'b is eliminated.
This prevents early deterioration due to transportation.

The driving force transmission system will be described below with reference to FIGS. 4 to 6. Figure 4 is 1. Second driving force transmission system 85
．． FIG. 5 is a schematic front view showing 1.86Yc. FIG. 8 is a cross-sectional view showing a state in which the second driving force transmission system 85°86 is expanded around the driving gear 88; The first driving force transmission system 85 includes an intermediate gear 89 that meshes with the driving gear 88;
A first driven gear 90 meshing with this intermediate gear 89 and a first
The second driven gear 92 has an intermediate gear 91 that meshes with a driven gear 90, and a second driven gear 92 that meshes with this intermediate gear 91.

Further, the second drive system transmission system 86 includes a third driven gear 93 that meshes with the driving gear 88, an intermediate gear 94 that meshes with this driven gear 93, and a fourth driven gear 94 that meshes with this intermediate gear 94.
It has a driven gear 95.

When the drive gear 88 rotates normally, that is, in the direction of the solid line arrow A in FIG.
When each gear group 93°94.95 of the first driving force transmission system 85 rotates in the direction of the solid line arrow, and the drive gear 88 rotates in the reverse direction, that is, in the direction of the broken line arrow B, each gear group 89, 90, 91, 92 and second driving force transmission system 86
Each of the gear groups 93, 94, and 95 rotates in the direction of the dashed arrow.

Further, the first driven gear 90 is connected to the first developing roller 50.
A second driven gear 92 is attached to the drive shaft 61m of the developer agitator 6 via a one-way clutch 97t', and the second driven gear 92 is attached to the drive shaft 65a integral with the sleeve 65 of the sleeve 65.

61m is configured so that the driving force is transmitted only when the gears 90 and 92 rotate in the directions shown by the solid line arrows, that is, when the drive gear 88 rotates in the normal direction, and the gears 90 and 92 rotate in the direction shown by the dashed-dotted line arrows.

Further, the third driven gear 93 is connected to the drive shaft 65'a that is integral with the sleeve 65' of the second developing roller 5, and the fourth driven gear 95 is connected to the drive shaft 61'a of the developer agitator 61'. The drive shafts 65'a and 61'a are connected via a one-way clutch 97, and drive force is transmitted to each of the drive shafts 65'a and 61'a only when the gears 93 and 95 respectively rotate in the direction of the dashed arrow, that is, when the drive gear 88 is reversed. and rotates in the direction shown by the dashed-dotted line arrow.

Further, the driving gear 88 is mounted on a bearing 98 as shown in FIG.
It is rotatably supported via... and the gear machine $
99 to the drive shaft 87a of the reversible motor 87.
It is attached to a rotating shaft 110 that interlocks with the rotary shaft 110. That is, a gear 11 is attached to the rotating shaft 110, and this gear 111 is attached to a bearing 1 on a support shaft 114 installed between a motor mounting frame 112 and a 774113 integrated therewith.
Gear 11 rotatably attached via 15, 115
It meshes with 6. A gear 117 having a larger diameter than the gear 116 is integrally formed with the gear 116, and this gear 117 is connected to a gear 118 attached to the drive shaft 87a of the reciprocal motor 87.
It is in a state of engagement. However, the repassive motor 8
The rotation of the drive shaft 87 & in both forward and reverse directions of the gear 118.1
17, 116, 111 to the rotating shaft 110, and the first. The second developing unit 52, 53f can be selectively operated simply by switching the reversible motor 87 between forward and reverse rotation.

The reversible motor 87 is switched between forward and reverse rotation by pressing a color designation button on an operation panel (not shown), and at this time, the magnetic roll driving means 100, 100', which will be described later, is activated to rotate the non-operating magnetic roll. 64, 64' (7) First magnetic pole 66 g, 66'
a can be switched to face the doctors 5B and 5B'.

Further, an intermediate gear 89 that meshes with the driving gear 88 and the first driven vehicle 90 is rotatably attached to a support shaft 121 via a bearing 120. The support shaft 12 is the arm 1 that can swing around the housing 122 that holds the bearings 98 and 98 that pivotally support the rotating shaft 110.
23, and its position can be changed so that it can reliably mesh with the driving gear 88 and the first driven gear 90.

Further, the first stirring roller 70 of the first developing unit 52 is intermittently driven via a first operating mechanism 24 shown in FIG.
The second agitation roller 70 and the developer replenishment roller 69 are simultaneously driven in conjunction with the movement of the developer.

That is, a ratchet gear 125 is attached to one end of the shaft 70m of the first stirring roller 70 of the first developing unit 52, and this ratchet gear 125 rotates in conjunction with the ON-OFF operation of the solenoid 126. It is intermittently driven by a predetermined amount via a ratchet pawl 128 attached to a displacing actuating arm 127.

Also, 1st. shaft 70a of second stirring row 270.70;
70b and the shaft 69hVC of the developer replenishment row 269 are each fitted with a sprocket (not shown), and an endless chain (not shown) is wrapped around the shaft 69hVC.
The stirring roller 70 is connected via this driving force transmission system (not shown).
, 70 and the developer replenishment row 269 are integrally driven.

Further, the stirring row 270' of the second developing unit 53
The developer supply row 269 is simultaneously intermittently driven via a second actuation mechanism 124' having the same configuration as the first actuation mechanism 124 and a driving force transmission system having substantially the same configuration. Note that the same components as the first actuating mechanism 124 have the same reference numerals with a dash, and detailed description thereof will be omitted.

Next, the developer brush 5 is applied to the surface of the developing roller 50, 51.
The structure of the magnetic roll driving means i o o, i o o' for rotationally displacing the magnetic rolls 64, 64' to form or remove the magnetic rolls 64, 56' is shown in FIGS. 7 to 9 a and b. Explain with reference to. The shaft 64a of the magnetic rolls 64, 64'.

One end of 64'a is the bearing 1 attached to the frame 130.
It is pivoted through 3 holes, and there is a lever 13 at the tip.
2 is installed. The tip of this lever 132 is engaged with an engagement groove 134a of an arm 134 rotatably mounted via a support shaft 133. moreover,
A first support part 134b formed at the lower part of the pivot end side of the arm 134 is connected to the plunger 135a of the solenoid 135, and a second support part 134 formed at the upper part of the pivot end side of the arm 134.
One end of a tension spring 136 is connected to c.

When the solenoid 135 is in the OFF state, the arm 134 is moved to the position shown by the two-dot chain line in FIG. 's doctor 5 g
Therefore, when the solenoid 135 is turned off, developer brushes 56 and 56' are not formed on the surfaces of the developing rollers so and si. There is.

In addition, when the solenoid 135 is in the ON state, the arm 134 resists the biasing force of the tension spring 136 and moves to the position shown by the solid line in FIG. 8, that is, to the first position as shown in FIG. magnetic pole part 66a.

The lever 132 is rotated to a position where the blade 66'a faces the doctor 58, 58'. Therefore, when the solenoid 135 is ON, the developing roller 50,
Developer pushes 56, 56' are formed on the surface of El.

As shown in FIGS. 2 and 3, the doctor 58' includes a doctor body 58'a made of a non-magnetic material and a band-shaped iron plate extending over the length of the doctor body 58'a. the first magnetic body 58'b, and the doctor body 58.
A second magnetic body 5 made of an iron plate provided at both ends of 'a
B'c and 5 g'c (only one is shown).

And the above 1. Second magnetic body 5 B'b, 5
B'c.

58'c is between the first magnetic pole part 66'a and the first magnetic pole part 66'a when the first magnetic pole part 66'a faces the doctor 58' and removes the developed part 56'a on the surface of the developing roll 5. The configuration is such that lines of magnetic force are formed to more reliably prevent the developer 56'a from being taken out.

The doctor 58 includes a doctor main body 58a made of a non-magnetic material, and a magnetic body 58c made of iron plates provided at both ends of the doctor main body 58m.

58c (only one shown),
In the same manner as in the case of the doctor 58' described above, the developer 56rh is
It is designed to prevent removal of the material. This doctor 58
is not provided with a magnetic material overflowing in the longitudinal direction of the doctor main body 58h like the doctor 58' described above, and the first magnetic pole part 66m of the developing roll 50 facing the doctor 58 and the fourth magnetic part of the developing roll 51 are The developer 56h is prevented from being taken out by utilizing lines of magnetic force formed between the magnetic pole portion 66'a and the magnetic pole portion 66'a.

Further, a second
As shown in FIGS. 1 and 3, a magnetic plate 140 is provided to weaken the influence of the magnetic flux density distribution of the other magnetic roll 64 and 64', and to ensure a good developer conveyance operation. .

Note that 141 shown in FIGS. 2 and 3 is a developer empty detection means for detecting that the amount of developer 56'a in the developer hopper 68' of the second developing unit 63 has decreased; A magnet 14 is attached to an actuator 143 that is integrated with a detection lever 142 that rotates according to the amount of developer.
4 is operated when it approaches a reed switch 145 as a detector provided outside the hopper 68'.

Also second. As shown in FIGS. 3 and 10, a cover 150 that constitutes a part of the top surface of the device main body 1 is provided on the top side of the two-color developing device 10 so that it can be opened and closed freely. a lid body 152 that opens and closes a top opening 151 for replenishing developer of the second developing unit 52; and a top opening 15 for replenishing developer of the second developing unit 53;
A lid body 152' that opens and closes 1' is exposed. By opening the lids 152 and 152', the developer 56FL and 56'th can be easily replenished from the top side.

Further, the c2 lid bodies 152, 152' are provided with color display sections 153, 153', so that the colors of the developers 56'a, 56'a stored therein can be easily distinguished, and different colors can be easily distinguished. This prevents the developer from being mixed in accidentally.

On the other hand, the first developing unit 52 containing the color developer 56m is a cartridge and a remitter that can be attached to and removed from the attached part 1a of the apparatus main body 1, and has a handle 155 (see FIG. 10). It can be easily removed by pulling it up in an upright position.

That is, the developer replenishing section 55 of the first developing unit 52
Positioning members 156° 156 (only one shown) are attached to both the front and rear walls of the
, 156 through the support shaft 157° 157.
Support rod portions 155IL and 155g at both ends of the handle 155 are rotatably attached to the support rod portions 155H and 1551L of the handle 155, as shown in FIGS. 11 and 12, respectively.
A locking means is integrally attached with a hook 158 that is rotatable around the center, and engages with a locking pin 159 as a locked portion provided on the device main body 1 side to restrict upward movement. 162. The positioning member 15
An engagement groove 156a as a first positioning part formed on the lower end side of 6 and an end surface 156 as a second positioning part
b is a positioning bin 160, 1 provided on the device main body 1 side;
61, and is configured to hold the first developing unit 52 in a predetermined position. Further, as shown in FIG. 12 (A) when the handle 155 is raised, the engagement between the hook 158 and the locking bottle 159 is released, and when the handle 155 is tilted to a nearly horizontal position, the hook is opened as shown in FIG. 12 (←). 158 is engaged with the locking pin 159, and by further pushing it from the horizontal position, the first
As shown by the arm in FIG. 2, the hook 158 and the locking bottle 159 are securely engaged to press the developing unit 52 downward.

Therefore, if the handle 155 is in an upright state, the first developing unit 520 can be attached and detached, and if the handle 155 is tilted to the insertion edge of the first developing unit 52, the first developing unit 52 can be fixed. Operation becomes extremely easy.

Further, the capacity of the hopper 68' of the second developing unit 53 containing the frequently used black developer 56'a is set larger than the capacity of the hopper 68 of the first developing unit 52 containing the color developer 56*. This allows for longer developer replenishment intervals and easier maintenance.

Next, the developing operation of the developing device 10 will be explained. First, when the color is specified by the button so that the first developing unit 52 side is operated, the magnetic rolls 64, 64'
reaches the state shown in FIG.
In the state shown in the figure, it rotates clockwise to form a developer magnetic brush 66'Jk on the surface of the sleeve 650.

Then, the electrostatic latent image previously formed on the photoreceptor 7 is developed with the color developer 56m.

When the development of the electrostatic latent image is completed in this way, the first
The magnetic roll 64 is rotated by about 25 degrees so that the first magnetic pole 66m faces the doctor 58, so that the sleeve 65
New formation of developer magnetic brush 66 on top is stopped;
In this state, the sleeve 65 is further rotated a sufficient amount to remove the developer magnetic brush 56. Note that at this time, the developer magnetic brush 66' is not formed in the second developing row 251 either, so that problems such as color mixing will not occur even if any of the developing units 52 and 53 is designated next. It has become.

Further, when the second developing unit 53 is designated for black color development, the magnetic rolls 64 and 64' enter the state shown in FIG. The sleeve 65' is rotated clockwise in the state shown in FIG. 3, and a developer magnetic brush 56' is formed on the surface of the sleeve 65'. After the electrostatic latent image on the photoreceptor 7 is developed to black in the same manner as described above, the developing operation is completed with the developer magnetic book 56' removed from the surface of the sleeve 65'. , the developer stirring body 61, 61' of the developing unit 5253 in the developing operation state and the stirring mechanism 7 o, vo
' is in constant operation and the developer replenishing roller 69,
At 69', the developer 56h, 56'th is replenished as appropriate in response to the signal from the developer gradient detector 6363'.
Good developing operation is maintained.

In addition, 1. Magnetic rolls 64, 6 of the second developing roller
By setting the magnetic pole arrangement structure of 4' as described above, the formation condition of developer magnetic brushes 56 and 56' is not impaired.

Furthermore, since the first developing unit 52 for color development is provided above the second developing unit 53 for black development, even if the developer spills from the upper stage for some reason, the color developer will not be removed. 65a, it becomes inconspicuous due to black development in the second developing unit 53, and image quality is not significantly impaired.

〔Effect of the invention〕

As explained above, the present invention has a cartridge type that can be attached and detached from the attached part, and has a handle for attaching and detaching, and a lock that fixes the developing device to the attached part in conjunction with the displacement movement of this handle. The device is configured to be able to release the locking operation, and can be attached and detached with a one-touch operation using the handle. Therefore, although it has a simple configuration, it is possible to provide a developing device that can be easily attached to and detached from the attached portion so as to easily perform color replacement.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic configuration diagram of a copying machine incorporating the developing device of the present invention, FIG. 2 is a schematic longitudinal sectional front view of the developing device, and FIG. 4 to 6 are schematic longitudinal sectional front views showing different operating states of the main parts, FIGS. 4 to 6 show the configuration of the driving force transmission system, FIG. Fig. 5 is a sectional view showing the developed state, Fig. 6 is a sectional view showing the driving force transmission state to the driving gear, Fig. 7 is a partially sectional plan view showing the magnetic roll drive means, and Fig. 8 is the same. 9(a) and 9(b) are explanatory diagrams similarly showing the operating state, FIG. 10 is a schematic perspective view of the developing device section, FIG. 11 is a front view showing the fixing structure of the developing unit, and FIG. Figures (a), (b), and (c) are explanatory diagrams showing the engagement and disengagement relationship between the handle and the hook. 10... Two-color developing device, 1 &... Attached part,
52... First developing unit, 53... Second developing unit, 155... Handle, 15B...
・F, Ri, 159... Locking bottle (locked part), 162
...Lock means. Applicant's agent Patent attorney Takehiko Suzue Figure 7 Figure 8 Figure 35 Figure 9 (a) (b)

Claims (1)

[Scope of Claims] (Li) A cartridge-type developing device that can be attached to and detached from an attached part, which is provided with a handle for attaching and detaching, and which fixes the developing device to the attached part in conjunction with the displacement movement of this handle. (2) The developing device according to claim 1, wherein the developing device is attached and detached in the vertical direction via a handle. (3) A handle that is rotatably attached to the handle and can be engaged with and detached from a locked part provided on the attached part side;
The developing device according to claim 1 or 2, wherein a developing device is attached to the developing device.