JPS60104968A - Developing device - Google Patents

Abstract

PURPOSE:To obtain a developing device with high operability by providing the device with two developing means and forming a selecting means for moving these developing means to a development enabling position and a developing disabling position respectively. CONSTITUTION:The developing device 24 is provided with a developing container 24A and developing rollers 302A, 303A to be the 1st and 2nd developing means are arranged in the container 24A. The 1st and 2nd developing rollers 302A, 303A are selectively used by the selecting means to feed different color toner t1, t2. In said constitution, high operability can be obtained without troublesome replacement of the developing means by the operator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a developing device included in, for example, an electronic copying machine capable of two-color development.

[Technical background of the invention and its problems]

An electronic copying machine uses a photoreceptor (tme), and after exposing the photoreceptor to a latent image to form a latent image, this latent image is made into a visible image by supplying a developer from a developing device. It looks like this.

By the way, this copying machine is equipped with, for example, two developing devices.
Development devices have been developed in which two-color development is possible by storing different color developers in each of these developing devices and selectively supplying these developers to the electrostatic latent image.

However, in the past, when developing two colors, the operator had to change the developing device each time.
Replacement work is time-consuming and troublesome, and at the time of replacement, developer scatters and the inside of the copying machine becomes dirty.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a developing device that can perform multicolor development without requiring the operator to take the trouble of replacing the developing device. It is something.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention selectively moves the first and second developing means for supplying developer to the image area to a position where development is possible and a position where development is not possible by means of a selection means.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1 to 3 show the external appearance of an electronic copying machine to which the developing device control device of the present invention is applied. The mounted paper feed cassette 3 is a paper discharge tray mounted on the left side of the main body 1 of the copying machine. Additionally, a document table 4 is provided on the top surface of the copying machine main body 1 and is movable back and forth in the left-right direction (direction of arrow a). . . , an operation panel 10 is provided with input keys 9 including an exposure setting zolium 7, print key 8 color selection buttons 301, and the like.

As shown in FIG. 2, the document table 4 has a structure including a document placing plate (glass plate) 12 on which a document 11 is placed, and a document cover 13 covering the upper surface of the document placing plate (glass plate) 12.

Also, the third cassette cover 14d of the paper feed cassette 2
As shown in the figure, the paper PI' (i=a manual paper feed tray 15 for manually feeding the paper as appropriate. Reference numeral 16 in FIG. 2 is a power switch.

Next, the entire internal mechanism of the electronic copying machine will be explained with reference to FIG. In the figure, reference numeral 20 denotes a drum-shaped photoreceptor as a developing area disposed at the center of the main body 1 of the copying machine. Driven. Following this operation, the charger 21
The original image, which is uniformly charged with electricity and irradiated uniformly by an exposure lamp 22, is imaged on a photoconductor 20 by a focusing light transmitter (trade name: Selfo-Rec Lens Array) 23 to form an electrostatic latent image. It is designed to be formed. The formed electrostatic latent image is transferred to the first developing roller J02A in developing device #24.
Alternatively, the second developing roller 303A converts it into a toner image and sends it to the transfer charger 25 side.

Automatically or manually fed paper P or P' is fed by the paper feed head 2, and the toner image previously formed on the photoreceptor 20 is transferred to the paper P by the charger 25.
Or transfer it onto y.

Furthermore, the toner image is peeled off from the photoconductor 20 by a peeling charge 27 caused by AC corona discharge, passes through a conveyance path 28, is fused and fixed onto a paper p (p5) by a superposition device 29, and is attached to a removable tray by an ejection roller 30. It is discharged at 3.

On the other hand, residual toner remaining on the photoreceptor 20 after transferring the toner image onto the paper P (P') is cleaned by a cleaning device 31, and the electric potential on the photoreceptor 20 is lowered below a certain level by a static eliminating lamp 32. It is ready for the next copy operation.

Further, a fan 33 serves as a cooling device and exhausts the heat generated by the heat generating part exposure run f2z and the fixing device 29 in the printing machine. Further, an exhaust fan 36 is also attached to the main motor 35 to cool down the heat generated by the power supply section 34 and the like.

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 37, and the other ends of both frames can be opened at a desired angle, for example, 30'. ing. A charger 21, a focusing light transmitter 23', an exposure lamp 22, a developing device 24, and a cleaning device 3 are installed around the photoreceptor 20 in the upper part 71/-.
1. Each device such as the static elimination lamp 32 is attached to the frame by appropriate means, and the fan 33 as a cooling device, the paper feed roller 38 of the paper feed device 26, and the document table 4 are also attached to the frame. The above unit IJA'i is constructed. The frame also includes a paper feed cassette 2, a transfer charge 25, a peeling charger 26, a conveyance path 28, a forming guide plate 39,
Each mechanism such as the fixing device 29, the ejection roller pair 30, the tray 3, the main unit 35, the power source section 34, etc. are attached by appropriate means to constitute the lower unit 1Bf. After rotating and removing the front cover 1a of the copying machine main body 1, almost all of the paper P is opened via a housing opening/closing device (not shown).
(It is configured so that it can be opened and closed along the P-shaped conveyance path 28.

Next, the developing device 24 will be explained.

In the figure, 24A is a developer container, and this developer container, ? 4A includes developing rollers as first and second developing means.
2A, ? o s A is installed.

These first and second rollers, image roller 302 A *3
0 and 'lA are selectively used by the selection means 350 to supply the different color toner tst2.

Note that the first developing roller 3'02A has a higher usage priority than the second developing roller 303A, and is located on the downstream side in the rotational direction of the photoreceptor 20. The selection means 350
f-J It is constructed and layered as shown in FIGS. 5 and 6. That is, 305 in the figure is a drive shaft, and this drive shaft 305
Spur gear, 906 A-made timing pulley 30
6B is integrally fixed. In addition, the spur gear 306A
A gear 308 is meshed with the , and this gear 308 is rotatably supported by a support shaft 307 fixed to the upper frame of the copying machine. An aperture 908a serving as an input means is integrally molded on one side of the gear 308.
is equipped with a spring clutch mechanism 312 consisting of a sleeve 309, a spring 310, a boss as an output means, and an integrally molded cam 31).

Further, 304 is a selection solenoid, and its plunger 30
One end of a locking lever 912 is connected to 4a.

This selection solenoid 304 is held by a holding plate 31.9, and the locking lever 312 is rotatably supported by a support shaft 313a. The above locking, ”-,
Reference numeral 912 includes a locking protrusion 912a'f (the first and second protrusion portions 309th protruding from the outer periphery of the sleeve 309) at the tip of which is biased by a spring 313b.

309b. Further, rollers 915, . 916 is transferred. These rollers 315, . The operating arm as a 916-operated Renoku? 77a, 317b, and the other ends of these operating arms 917a, 917b are rotatably supported by the idle shaft 320.These operating arms 317a, '+17 b
is biased by a spring 914. In addition,
The guide shaft above? 20. This is the center of rotation of a holding frame (not shown) of the Jd developer container 24.

On the other hand, the timing pulley 306B of the drive shaft 305
A pulley 321a is connected through a toothed belt 919f, and this pulley 321a connects to the guide shaft 320.
Rotate around. A gear 321b is provided on one side of the pulley 321a, and a gear 322 that rotates the second developing roller 303A is meshed with the gear 321b. Further, 323 is a clutch control pawl support shaft fixed to a holding frame (not shown) of the developer container 24A, and 324 is a lever support shaft. The clutch control pawl support shaft 323 has a first shaft that controls the transmission of the rotational force of the gear 321b to the first developing roller 302A via a spring clutch 325.
A second locking lever 32B that appropriately transmits and controls the rotational force of the locking lever 322 and the gear 322 to the second developing roller 303A via a spring clutch 326, the first locking lever 327, and a second locking lever 32B. Both sides of the stop lever 328 are connected to each spring clutch, ? 25,. The first locking lever 327 and the second locking lever 328 are moved into the sleeves against the urging force of the torsion spring 331 and the torsion spring 33 which urge the sleeves 329 and 330 of the sleeve 926, respectively.
? 29, J,? Each engagement protrusion on 0, 9
29 a, ? , 90 m, and a release link 332 is rotatably supported. Also, the release protrusion of the release link 332, ? , 9
2 m, , 9.92 There is a long hole 332c on the opposite side of b.
is bored, and this long size 332c is the lever support shaft 324.
The engagement shaft 9.9.9 a is caulked to one end of the input lever 333 which is rotatably supported on the input lever 333 . Further, on the opposite side of the input lever 333 sandwiching the lever support shaft 324, a U-shaped groove 3.9b is formed to engage with a fixed shaft 334 caulked on the frame.

However, what about the drive shaft during development? 05 is rotated, spur tooth li, ? 06 A is rotated in the direction of arrow C, and the gear 90 B is rotated, for example, the second developing roller 90.9 A command to supply toner is given to the operation of the color selection button V o 7. Selection solenoid, when given the back? 04 is excited, and the locking lever 312 is the supporting shaft. Rotate in the e direction with I J l 'i as the center. The locking protrusion 312a of the locking lever 312 is a sleeve. 09 first convex portion 309 m
The second convex portion 309b moves away from the convex portion 309b and enters the rotation locus of the second convex portion 309b. Therefore, due to the action of the spring clutch 910,
The cam 311 rotates by a predetermined angle in the direction of arrow f in the figure and then stops. The driven arm of the deflection harrow roller 316 of this cam 311, 1
17 a f: swings in the direction of arrow g, contacts the retaining shaft and moves in the holding frame 'th direction (counterclockwise), first developing roller; The developing roller 30.9A is brought close to the photoreceptor 20.

On the other hand, the rotational force of the drive shaft 305 is determined by the timing
? 06 B and belt 319f via boo IJ
-,? 21a. As a result, the gear, 92
Gear 322 is rotated via 1&f. Also, if the holding frame rotates counterclockwise, it will crack.

The control pawl support shaft 323 and the lever support shaft 324 descend in the direction of the arrow. This causes the input capper 333 to move as shown by the arrow j.
Rotate in the direction. As a result, the release link 332 becomes the pivot.
? 2.9 'ii Rotate counterclockwise around the center.

At this time, the second locking lever 328 ij release link 3
The projection 9.92a separates from the projection 330a of the sleeve 330 and releases the release projection 432a.
approaches the sleeve 329, the first locking lever 327 enters the rotation locus of the engagement protrusion 329a of the sleeve 329, and the second developing roller 303A is moved by the action of the spring clutches 306 and 305. Bell),? 4
J'i, and the rotation of the first developing roller 302A is stopped.

This operation is performed during the approximately 1.6 seconds required from when the print key 8 is operated and the document table 4 starts moving from the home position until the leading edge of the document P reaches the exposure section. on the other hand,
When the command to supply toner t1 by the first developing roller 302A is selected, the second developing roller ? 03A is photoreceptor 20
The first developing roller 902A approaches the photoreceptor 20 and rotates, and when the print key 8 is input, the developer supplied by the first developing roller 302A is developed with the color of the color. There are many things that can be done.

〔Effect of the invention〕

As explained above, in the present invention, the movable first and second developing means for supplying developer to the μ imaged area to develop it are selected by the selection means into the development possible position and the non-development possible position. Since the developing device is moved in a fixed manner, it is possible to perform multicolor layered images without the operator having to take the trouble of replacing the developing means as in the past, which provides excellent operability and eliminates the possibility of contaminating the inside of the copying machine with developer. It has the effect of not being there.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 to 3 are external views showing a copying machine, FIG. 4 is an internal configuration 1 thereof, and FIG. 5 is an exploded perspective view showing a selection means. FIG. 6 is an exploded perspective view showing the power transmission mechanism, and FIGS. 7 and 8 are explanatory views showing the moving state of the developing roller. 20... Photoreceptor (portion to be developed) 1.902 A... First developing roller (first developing means), 303A... Second developing roller (second developing means), 350... Selection means O

Claims (4)

[Claims] (1) Movable first and second developing means that supply developer to the developing area and develop it, and selectively move these first and second developing means to positions where development is possible and positions where development is not possible. 1. A developing device characterized by comprising: a selection means for moving the developing device. (2) The developing device according to claim 1, wherein the first and second developing means are stopped in operation when they are in the non-developing position. (3) The part to be developed is movable relative to the first and flute 2 developing means, and the first and second developing means are disposed along the moving direction of the part to be developed, and either one 2. The developing device according to claim 1, wherein the first or second developing means, which is more convenient, is located downstream in the moving direction. (4) The selection means includes an actuation lever that is swung by the rotation of the cam, and the oscillation of this actuation lever moves the first and second developing means in the direction towards and away from the developing area. A developing device according to claim 1, 2, or 3.