JPS5931990A - Image forming device - Google Patents

Abstract

PURPOSE:To clean only a transfer material supporting member without requesting special operation of cleaning for an operator or a customer engineer by providing a transfer material supporting member cleaning mode wherein a cleaning member which cleans the transfer material supporting member is operated selectively. CONSTITUTION:A cleaning mode selection switch A is turned on and the number of copies is set with a setting switch B for the number of copies, thereby determining the cleaning time of a drum 33 as the transfer material supporting member. When a copy operation start switch C is turned on, a transfer drum driving part E is driven through a control part D to rotate the transfer drum 33 for the time determined by the switch B, and the transfer drum cleaning member 40 is also operated to clean the transfer material supporting member on the transfer drum 33, i.e. screen member 333. If the number of copies is not set with the switch B, or when this switch B is not provided, the screen member 333 is cleaned for the time corresponding to one copy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides the following advantages:
The present invention relates to an image forming apparatus such as a copying apparatus that performs image transfer on a transfer device 4 supported by a transfer device 4.

Conventionally, in such a transfer 1414 image formation% igr, the transfer is supported on a drum-shaped or belt-shaped support member] A and synchronously transferred to an armature carrier such as a photosensitive drum! Then, the toner image thereon is transferred to a transfer plate. Therefore, like the transfer material, the transfer support member is in close proximity to or in contact with the image carrier, and as the operating time becomes longer, the dirt on the transfer material support member increases. If the transfer material support section becomes soiled in this manner, the back of the transfer sheet or the transfer band or container will become soiled. In order to prevent this, generally a special cleaning section is provided to clean the transfer material support section 4-1, and cleaning is carried out before and after the completion of the image 1111 4-''. However, if a large amount of toner adheres to the former transfer support member due to a transfer material jam, etc., the toner may not be removed sufficiently by IJ-washing for a short time.In such cases, the cleaning time may be reduced. Length 7'i,, l', J: Good, but has the disadvantage that the image forming process during printing takes longer.

On the other hand, the name of the operation is to take out the transfer material support part from the image forming apparatus and clean it with a JC'+ν remover, etc., but this has the disadvantage that it requires 13 times and manpower. be. The present invention has been made in view of a series of points, and its purpose is to eliminate the need for operators or maintainers to carry out special work for cleaning debris without slowing down the speed of the regular painting process. It is an object of the present invention to provide an image 181 forming device c4 which is capable of cleaning a transfer material support member without requiring the same. switching, normal image forming mode and e
By switching between the cleaning modes in which the Jf shrine support parts 4 and 4 are cleaned separately, the drawbacks of soil...h are eliminated.

Present invention L7. )! FY-rat &;I
A cleaning section, IA, is provided to transfer the transfer part H (i'ff 4t+), and in addition to the normal cleaning part 11'F for cleaning the image 1,
The cleaning member is selectively activated in order to clean only the support portion.

Below, color Fk1. ''7! Apply to is/r[
- Regarding the body side, details of the present invention will be explained with reference to the drawings.

First, the color copying machine shown in FIG. 1 will be explained. In the figure, 1 denotes an electrophotographic photosensitive drum having a K-tf edge layer, which is rotatably supported by ll1ll12, and starts rotating in the direction of arrow 3 in response to a copy command.

When the drum l rotates to the stereoscopic direction, the document 0 placed on the original magnifying glass 4 is illuminated by an illumination lamp 6 integrated with the scanning mirror 5, and the second reflected light is used for the second scanning. Scanned by mirror 7. The first scanning mirror 5 and the second scanning mirror 7 are rotated at a speed ratio of 1:1/2. A O
And the optical path length up to lens 8 was always kept constant! 1. The original is then scanned.

After the reflected light 1oa passes through the lens 8 and the third mirror 9,
The colors are separated by a color separation filter 10, passed through the fourth mirror 11 and the dust-proof sealing glass 12, and then focused on the drum 1 at the exposure section 13.

Drum l (I is neutralized by the static eliminator 14, then the primary storage device 1
5, the illumination rung 6 is charged in the fog light section 13.
The irradiated image is exposed to slit light. At the same time, the static electricity is removed using AC or the opposite polarity to the next one, 1J is removed by the device 16, and then the entire surface is exposed by the lamp 0]7.
A static %, 1R image of Hatake contrast is formed on the Yoshitram J.

The electrostatic latent image on the optical drum 1 is then processed by the developing device 18.
Visualized with toner. The developer 18 is yellow 181,
It is composed of four developing devices: magenta 182, cyan 183, and black 184, and a toner image of the required color is obtained by operating the designated developing device corresponding to the color separation filter used for exposure.

The transfer material 20 in the cassette 19 is fed into the machine by the paper feed roller 21, the rough timing is taken by the first register roller 22, and the precise timing is taken by the second register roller 23. Is the tip of the transfer drum 33 grit? 24.

The details of the transfer drum 1 will be described later, but as the transfer drum 330 rotates, it is conveyed while being wrapped around the transfer drum 33, and the transfer charger 25 and the transfer drum 1 pass between the transfer charger 25 and the drum 1. , l' 20 passes jIf+ while V is inverted '11
(The toner image on the optical drum 1 is transferred onto the transfer drum 4. The transfer drum 33 is rotated by Fyr 0 revolutions while keeping the tip of the transfer 4-<20 with the grits 24, and the desired color is transferred. A number of images are transferred.

The photocopying machine shown is a Zaiz Aoi fII! This figure shows two cassettes I-, each loaded with transfer materials of different Ijl, so that these transfer materials can be selectively fed.

After the transcription is completed, the transfer is released from Grid F24,
The sheet is guided to a conveyor belt 27 by a separating claw 26, and is further fixed to redundant rollers 4J28 and 29 by 11 pressures and heat, and then discharged to a tray 30.

Also, the surface of the drum l is cleaned by a cleaning device 31 consisting of an elastic blade.
L, it is now possible to proceed to the next orgasm.

FIG. 2 shows the details of the above transfer drum 33. The transfer drum 33 shown in FIG. A screen 333 is held as a transfer material support member while maintaining the same curvature as the cylindrical surface.

Near the transfer material separation section 36, chargers 37 and 38 are used to remove the transfer material and the screen 333 for 1N, L, to weaken their adhesion and to eliminate static from the screen 3331. They are placed opposite each other.

Don't kidnap the support for the above-mentioned transcription phase, that is, the screen section 333
A cleaning section 40 for cleaning the old transfer support section is provided in order to remove dirt from the former transfer support section. In the illustrated embodiment, this cleaning gl+ 4340 has a cleaning brush that, after the transfer I has been separated from the screen portion, IJ' 333, is attached to the screen R1t, as shown in solid lines in the figure. 4'43
33 and sweeps the screen member 1lII, but at the time of rotation '11, it is moved by grungy Y etc. to the position indicated by the broken line in the figure and the screen tW ((:q 3 :
It does not disturb the toner image at 414'- when it is rolled away from the surface.
If a jam occurs [7], toner is not supplied to the transfer 4 (holding member), and the toner is transferred onto the screen H with the transfer pestle, causing a jam. During the process of cleaning the screen member (333), toner often arrives at the screen member 333, and there are cases where the toner cannot be removed sufficiently in a short period of cleaning. Although it is possible to make the cleaning heating charge 40 longer by 11 hours, this will increase the time required for copying when copying is repeated at one copying time.

The present invention & J1, the above problems? , in order to eliminate the IX combination,
]Cleaning during normal copying process
In addition to the operation, a device is provided for selectively operating the cleaning section 40 in order to only clean the transfer support section H. One embodiment of an apparatus for selectively actuating cleaning members is shown in block diagram form in FIG.

In the figure, A is the cleaning mode selection switch, B is the number of copies per copy setting switch, C is the copy operation start switch, and D
1 shows a control section, E shows a transfer drum and a driving section, and F shows a transfer drum cleaning member driving section.

This device is provided with a mode in which only cleaning is performed, in addition to the cleaning operation that occurs in the JL Cobie rod.
This makes it possible to clean the transfer material supporting portion H only when necessary. To explain the operation, first, turn on the cleaning mode selection switch A provided on the operation panel of the main body, and set the number of copies per copy using the number of copies setting switch B. 33. Set a time for cleaning. Next, copy operation start switch C
When set to ON, the transfer drum driving section E is energized via the control section to rotate the transfer drum 33 and to rotate the transfer drum cleaning member 40 for a time determined by the number of copies setting switch B. When activated, the old transfer support part (A, that is, the screen H1(4; t:33:4) of the transfer drum 33 and J- is cleaned.

If the number of copies per copy is not set using the number of copies setting switch B, or if there is no switch B, the screen unit 1 is
) I' : 133.

Concrete 1 of the operation in the case of slightly - 3 figure! ill (
An example of ill1 will be explained with reference to the circuit diagram in FIG. 4 and the timing chart in FIG. 5. In the Jul key matrix in Figure 4, the keys in the 1 and
0I.

1, 02 ir:ll, respectively, key scan circuit,
The key decoding circuit detects the pressed key as I'l'1-ir.
'Jru. For example, in the cleaning mode, the value set manually by the key is the number of rotations of the transfer drum to be cleaned (for example, setting 11^11 means that the transfer drum makes one copy, so it rotates 4 times). This QJ is stored and held in the memory circuit 103. On the other hand, it is also input to the decrement counter 1.04, and the number of rotations of the transfer drum is
It is counted by the transfer drum HP 113. A f
-, 1 cleaning mode selection switch. When the switch is turned on, the select inputs of analog switches 107 and 109 are connected to LO" and pl a respectively, and the transfer drum I (P signal is On the other hand, at the switch 109, the copy start signal 1 is sent to the counter 104.
The output of F/F' 108 set by 16 is connected to operate the cleaner device. Therefore, when the shift turning mode 1° is selected by switch A, analog switch 107. I (19 is connected to contact a, and the desired cleaning rotation (is done manually).
When set, the set number is held in the memory circuit, and the IJD 1 of the shift segment is stored in the display drive circuit 105.
Displayed on 06. After this, when you turn on Copy Dekun C, F/F 108 is hit, and the subtraction counter goes to riJ Yoshinobu'! , 117, a main motor drive signal 119, and an analog switch 109 or dirt 120 to drive the cleaner device 112 through the drive circuit 110. The other input 12 of the OR gate 1.20
2 is a cleaning device drive signal from a control circuit that does not indicate 1n1, and 11n is a normal copying device drive signal 1? This is the operation input signal when the cleaning device is activated. 121 is a copy start signal to the ili' control circuit (not shown), and 123 is a copy start signal to the control circuit 16 (not shown) of the fli control circuit.
, is a copy enable signal. For example, if the copy enable signals are not aligned, such as out of toner or out of paper, 123 becomes "I, O" and the copy switch C00N t:J: is disabled at the AND dirt 124. When the main motor and cleaning device start operating, the transfer drum rt
The P double sign is not shown (: from the JJ knowledge circuit, the
It is input every rotation of the drum, and the subtraction counter 104 counts down. When the cleaning of the predetermined number of rotations is completed, the under 70 number 11 of the counter 104 decreases.
8 is output to reset tl, F'/F 108,
The main motor and cleaning device stop, and the copy signal 1
21 also falls to 'r,o', ending the sequence and ending the cleaning operation.On the other hand, in the normal copy mode, analog switches 1.07, 1+)
9 is connected to b, the count input of the subtraction counter is the copy discharge bond 114, and the cleaning device is activated.
All the operations are exactly the same, except that they are activated for a predetermined period of time in response to a cleaner activation signal 122 from a control circuit (not shown).

A device 6 for selectively cleaning the cleaning member 40
Another example is shown in FIG. In this embodiment t, a copy operation start switch 40 and a cleaning operation start switch are provided separately, and in the figure, A, I), and E.

F indicates a cleaning mode selection switch, controls ↑ to 11, transfer drum drive section, and transfer drum cleaning member drive section similar to those shown in FIG. 3, respectively, and G indicates a cleaning operation provided separately from the copy operation start switch. Indicates start switch. Further, although the number of copies per copy setting switch is not shown in FIG.
Performed by Grodalam.

In the above embodiment, a cleaning brush is used as the cleaning member 40, but a non-contact cleaning member using suction air flow or the like may be used instead. In the description, the transfer drum 3 is used as the support part 44 for the transfer 4.
Cylindrical shape held at 3) σ) Provided with screen agent +d/ζ
As mentioned above, the member with the transfer markings may be in the form of an endless belt, and the same effect can be obtained on a non-porous resin sheet instead of using it as a screen. can be achieved.

As explained above, the present invention 1. J:, j+(1 Cleaning movement fl+ and V in the regular image 1'a'' forming work
, 1. Separately, by providing a transfer material support member cleaning mode 1 which selectively operates the cleaning part 4-(which returns the transfer material support part side), the speed of the normal image forming process can be reduced only on the support part side. To provide an image forming device capable of cleaning.

[Brief explanation of the drawing]

FIG. 1 is a side view of a color photographic device to which the present invention is applied;
Transfer in the apparatus shown in FIG. 1 in FIG.
FIG. 4 and FIG. 5 are circuit diagrams and timing charts showing specific control examples in the device shown in FIG. 3, and FIG. FIG. 1 is a block diagram illustrating the operation of a cleaning member according to an example. 1: Photosensitive drum, 2o: Transfer material, 33: Transfer drum, 331 Ni drum main body, 333: Transfer material support member (screen heating material), 40: Cleaning member (cleaning brush).

Claims (1)

[Claims] [Image] [Image of transferring 1 toner of 1 carrier soil to transfer I soil supported by transfer material support section 41 (In the image forming device, cleaning section 44 that cleans the transfer material support section IH)
is provided, and apart from the cleaning operation in the image forming process, the cleaning section is selectively moved 1'F in order to optionally perform only cleaning of the transfer material support section H. Image forming device jA0