JPS6325674A - Image forming device - Google Patents

Abstract

PURPOSE:To always obtain a stable and clear copy by driving a means for cleaning an electrifying wire when the temperature of a fixing device at the time of turning on a power supply switch is a fixed temperature or below. CONSTITUTION:The power supply switch is turned on and the temperature of the fixing device is detected by a temperature control means 511. When it is decided that the temperature of the fixing device is <=600 deg.C, the electrifying wire is cleaned by an electrifier cleaning means 510. Consequently, the electrifying wire is cleaned at least once a day, so that clear copies can be always stably obtained. In addition, troublesome electrifying wire cleaning work to be executed by a service man at the time of periodical inspection can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image forming apparatus that can automatically clean charging wires.

(Prior Art and Problems to be Solved by the Invention) Conventionally, image forming apparatuses have not been equipped with cleaning means to automatically clean the charging wires, so service personnel have to clean the charging wires during periodic inspections. I had to pull it out and clean the C12 wire directly. For this reason, cleaning work is time consuming, and if a large number of copies are made before the next periodic inspection, the charging wire becomes very dirty, and the image does not have streaks, resulting in 1'f unevenness, resulting in clear copies. There was a problem in that it was not possible to obtain

Therefore, the present invention has been made to solve the above-mentioned problems of the conventional example, and its purpose is to provide an image forming apparatus that can always produce stable and clear copies. .

(Means for Solving the Problems) In order to achieve the above object, the present invention detects the temperature of the fixing device by a detection means, and maintains a constant temperature of the fixing device when the power switch is turned on. It is constructed by operating a cleaning means for cleaning the ribbon core wire when the temperature is below the temperature.

(Function) In the present invention, the charging wire is cleaned when the temperature of the fixing device is below a certain temperature when the power switch is turned on, thereby preventing uneven charging.

(Example) Below, refer to the drawings.]! One embodiment of No. 1 will be explained in detail.

FIG. 3 is a cross-sectional view showing the entire structure of an embodiment of an image forming apparatus to which the present invention is applied.

In the figure, the surface of the drum 1 is made of a seamless photoreceptor using a photoconductor and an electric conductor, and is supported by a rotatable moat, and is driven by a main motor 3 that operates in response to pressing the copy start key.
starts rotating in the direction of the arrow. When the predetermined rotation of the drum 1 and the potential control process (1m process) are completed, the document placed on the document table glass 34 is illuminated by the illumination lamp 40 that is integrated with the first scanning mirror 39. The reflected light is reflected by the first mirror 39 and the second mirror 36.
, 3rd mirror 37, lens 35.2J'S 4 mirror 3
8 and is imaged onto the drum 1.

The drum 1 is corona charged by the high pressure unit 2. Thereafter, the image irradiated by the illumination lamp 40 is exposed to slit light, and an electrostatic latent image is formed on the drum l by a known method.

Next, the electrostatic latent image on the photosensitive drum 1 is developed with a developer cola in the developing device 7, and is visualized as +i (visualized) as a toner image.
The toner image is transferred by two-electrode μs.

The transfer paper in the upper cassette 13 or the lower cassette 14 is fed into the main unit by the paper feed roller 11 or 12, and is sent in the direction of the photosensitive drum l by the registration roller 15 with accurate timing, so that the leading edge of the latent image and the transfer paper is matched with the tip of the After that, transfer charger 5 and drum l
The toner image on the drum 1 is transferred by the transfer paper passing between the drum 1 and the drum 1.

After the transfer is completed, the transfer paper is separated from the drum l by the separation charger 8, and guided to the fixing device 32 by the conveyor belt 17.
It is fixed by applying pressure and heating, and then the discharge roller 1
9-1 and 19-2 are ejected from the aircraft.

After the transfer, the drum l continues to rotate using the cleaning roller and elastic blade! ? , the surface is cleaned by the cleaning device 6 that has been constructed.

The pedicle 200 can be separated from the main body 100 and has a deck 54 capable of storing 2000 sheets of transfer paper and an intermediate tray 59 for double-sided copying. Also, 20
The lifter 54L of the deck 54, which can accommodate 00 sheets, is raised according to the amount of transfer paper so that the transfer paper always comes into contact with the paper feed roller 5o.

During double-sided copying or multiple copying, first, the paper discharge flapper 33 of the main body 100 is raised, and the copied transfer paper is stored in the intermediate tray 59 via the conveyance path 57 of the pedicle 200. At this time, the multiple flapper 52 is lowered during double-sided copying, and raised during multi-hair copying.This intermediate tray 59 can store up to 99 sheets of transfer paper. The stored transfer paper is pressed down by the intermediate tray weight 53.

During the next back side copy or multiple copy, the transfer paper stored in the intermediate tray 59 will be transferred.

The paper feed roller 51. Due to the action of the weight 53, the registration roller 1 of the main body 100 is moved through the path 58.
It leads to 5.

300 is a circulating document feeder 2t (RDF), 301 is a stacking tray for feeding documents, and 302 and 303 are document size detection sensors, which are provided at a predetermined interval in the direction perpendicular to the paper surface and the eaves. The size of the original in the +jJ direction is determined by whether both sensors 302 and 303 are detecting the original.
This can be determined by checking whether only 03 (assuming 303 is on the far side of the page) detects the original. In addition,
By increasing the number of sensors, more accurate size can be determined. Also, the size in the length direction is the sensor 303 (30
2) can be determined based on the time during which the document is being detected.

In addition, in this RDF 300, the document sent from the stacking tray 301 through the sheet path 304 to the exposure surface is sent through the sheet bus 305, so that it is returned to the stacking tray 300.
I can help you.

The detailed operation of RDF can be found in the application filed by the applicant.
1/(59-206619), so it will be omitted here.

Reference numeral 400 is a Queeny 2-shear, and the transfer paper discharged from the main body lOO is folded in half or Z-folded in a paper folding section 450 according to the specifications, and outputted to the oscillating copy tray 401 or to the stable tray 402. Each part is bound by a stable 403 and dropped onto a stacker tray 404.

The paper folding unit 450 uses a flapper 454 when two-folding is specified.
is activated, guides the transfer paper to the lower conveyance path, the leading edge of the paper is stopped at the middle 11f1 section 451, and the part that is bent by passing through the roller 453 collides with the contact part 452 and is bent into a square. It is again guided from roller 453 to finisher 400 via roller 455. Here, when folding in half, it is folded gracefully at the intermediate part 451 and is not conveyed to the connecting part 452.
It is directly discharged from the roller 455 to the finisher 400. Further, when the paper is not folded, the flapper 454 is not operated and the paper is transported to the finisher 400 as it is.

When the staple mode is selected, the finisher 400 discharges the transfer paper to the stable tray 402, operates the staple supply section 403 according to an instruction from the main body 100, and staples the paper. Then the sticker
It is dropped onto the tray 404. By repeating the above operations, multiple bound copies are completed. At this time, if stable is not selected, the transfer paper is output to the oscillating copy tray 401, and according to instructions from the main unit 100, it is possible to make multiple copies by shifting the paper 30 degrees to the left or right at a predetermined location. .

Next, FIG. 4 is a plan view showing the entire operation section of the main body 100. In the same figure, 101 is a zero (asterisk) key that allows the operator to set binding substitution, size of document frame eraser, etc. Used for setting mode.

102 is an all reset key, which is pressed to return to standard mode.

Reference numeral 103 is a preheating key, which is pressed to put the machine into preheating state 5B or to cancel the preheating state. It is also pressed to return to standard mode from auto shaft off state y8.

104 is a copy start key, which is pressed to start copying.

105 is a clear/stop key; the clear key is used during standby, and the stop key is used during copying. here,
The clear key is pressed to cancel the set number of copies, and is also used to cancel the asterisk mode. The stop key 2 is pressed to interrupt continuous copying, and the copying operation stops after the copying at the time the key is pressed is completed.

Numeric keys 106 are pressed to set the number of copies, and are also used to set the book (asterisk) mode.

Reference numeral 107 is a memory key in which the user can register frequently used modes.

108 and 109 are copy density keys, which are pressed to manually adjust the copy density by 31 sections.

110 is the AE key, which automatically adjusts the copy density according to the density of the original: 3J or AE (automatic density adjustment)
Press to cancel and switch to manual mode.

111 is the cassette selection key, which is pressed to select the upper cassette, lower cassette, or lower paper deck.
Also, if an original is set in the RDF/DF, the APS
(automatic paper selection device) can be selected.

112 is the same size key, which is pressed to make a same size (original size) copy.

Reference numeral 113 is an auto-magnification key, which is pressed to automatically reduce or enlarge the P-size draft to match the specified copy paper size.

114 and 115 are zoom keys, which are pressed to specify any magnification between 64 and [4Z%.

116.117 is a constant magnification key, which allows you to reduce/reduce the standard size.
Press to specify enlargement.

A double-sided key 118 is pressed to make a double-sided copy from a single-sided KC document, a double-sided copy from a double-sided original, or a single-sided copy from a double-sided original.

119 is a binding key, which is pressed to create a binding margin of a specified length on the left side of the transfer paper.

120 is a photo key, which is pressed when copying a photo original.

Numeral 121 is a multiple key, which is pressed when forming images on the same side of transfer paper from two originals.

Reference numeral 122 denotes a document frame erase key, which is pressed by the operator to erase the frame of a standard size document, and the size is set using this key.

123 is a sheet frame erase key, which is pressed to erase the frame according to the cassette size.

Reference numeral 124 is a page continuous copying key, which is pressed to copy the left and right pages of a document on separate sheets.

125 is a staple key, which is pressed when stabilizing.

126 is 2-fold Liquite, A3 size, B4 size? Press when folding the size into a Z shape.

127 is the half-fold key, which is pressed to fold A3 or 84 size documents in half.

128 is a sort key, which is lit in standard mode if the machine is equipped with a sorter. Press to cancel or switch to sort mode.

Reference numeral 129 is a group key, which copies a plurality of copies from one original, and if it is equipped with a sorter, it is stored in each bin, and the finisher 400 is stored in the oscillating copy tray 401 in different levels.

201 is an LCD (liquid crystal) message display, with 40 characters each consisting of 5 x 7 dots. It is a transflective liquid crystal display with two colors in the octagonal light.Normally, the backlight is green, but in the event of an abnormality or when copying is in a state of aging, an orange backlight is lit.

A magnification display 202 displays the set magnification in %.

Reference numeral 203 indicates the same size display, which lights up when the same size is selected.

Reference numeral 204 is a color developer display, which lights up when a sepia developer is set.

A copy number display 205 displays the number of copies or a self-diagnosis code.

Reference numeral 206 indicates the cassette in use, which indicates which of the upper, middle, and lower cassettes or decks is selected.

207 is the original orientation display, which indicates the orientation of the original (portrait/
(horizontal).

208 lights up when AE large display and AE (automatic density! section 81) are selected.

209 is a preheating display, which lights up when the preheating state is y8. Flashes when the auto shaft is off.

Reference numeral 210 indicates a ready/wait display, which is composed of green and orange LEDs, and the green light is lit when the machine is ready (copy is possible in the near future), and the orange light is lit when the machine is wait (copy is not possible).

211 has a double-sided copy display, which allows double-sided copying from a double-sided original,
Lights up when you select either 1-sided original or 2-sided copy. 2 In addition, in standard mode, when using RDF, the number of copies is 1,
C-degree AE mode, auto paper selection 1 equal size, single-sided copy from 1 ni original.

When RDF is not used, the settings are 1 to 11 copies, manual density mode, same size, and one-sided copy from one-sided original. It depends on when RDF is used and whether a manuscript is set in unused RDF.

Next, the operation control shown in FIG. 3 of the present invention will be explained.

FIG. 1 is a circuit block diagram for carrying out the present invention.
01 is the central processing unit (CPU), for example NEC tile C0
Use M87AD. A ROM memory 502 stores a control program, and the CPU 501 controls the apparatus according to this program. 503 is a RAM memory which is a main storage device; 504 is an interface for outputting a control signal to a load such as a main motor; 505 is an interface for inputting an input 0 from a tip sensor, etc.;
06 is an interface for controlling input/output of keys 507 and display 508. Note that the display 508
uses an LED and an LCD for each display shown in FIG. 4, and the key 507 shows which key has been pressed using a known key matrix for each key shown in FIG.

Here, the image forming apparatus according to the present embodiment detects the temperature of the fixing device by the detection device, and includes a cleaning device that cleans the band TL line when the temperature of the fixing device is below a certain temperature when the power switch is turned on. Further, the number of copies is counted by a counting means, and a cleaning means for cleaning the charging wire is operated when the counted value of the counting means reaches a preset value. The cleaning means is designated by the reference numeral 510 as shown in FIG. 1, and is connected to the central processing bag 501 via an interface 509, and 511 is a temperature control means for the fixing device used as a detection means. In the example, the temperature of the fixing unit 32 (shown in FIG. 3) is detected by a thermistor, and like the cleaning unit 510, it is connected to the central processing unit fi501 via an interface 509.

To explain the cleaning means 510 in detail based on FIG. 2, the charged wire 301 is held between cleaning pads 302,
03 is rotated forward/reversely, the pulley 304 is rotated and the wire 305 is moved, and the cleaning pad 302 attached to the wire 305 is moved relative to the wire 301 and Clean 301.

Next, the flowchart of the software of the central processing unit 501 in FIG. 1 will be explained according to FIGS. 5 and 6. In FIG. It is determined whether the temperature is 60° C. or lower based on the temperature control means 511 of the fixing device. in this case.

Detecting the temperature of the fuser 32 means whether or not it is the first time the power is turned on, and the fact that the temperature of the fuser is 60° C. or less in step (3) means that it is the first time the power is turned on. .

As a result, the process moves to a step-by-step routine, and the charging wire 301 is cleaned once a day. As shown in FIG. 6, the step cleaning routine turns on the motor 303 in forward or reverse rotation according to the direction flag in step 0 (step Q
, O), the period of rotation iIt is constant and is 20 seconds (Step Co., Ltd.)0 Since the cleaning means 510 in this embodiment is not equipped with a sensor, the cleaning pad 302 contacts the opposite side and presses for a certain period of time. If the mechanism becomes overloaded, the torque limiter will cause the engine to idle. When it is determined that 20 seconds have elapsed in the step, the motor is turned off in step [phase], and the direction flag is inverted in step 1I)i to be used in the next time. On the other hand, in FIG. 5, a copy counter (not shown) as a counting means is cleared in step 2. Then, when the copy key is pressed in step 2, one copy is made in step 2, and the copy counter (not shown) is cleared in step 2. is +1. If it is determined in step ■ that the value of the copy counter has become greater than 5ooo, the cleaning routine in the cleaning routine step [phase] is performed, and then the copy counter is cleared (step ■), and it is determined whether or not to continue copying. Determine in step ■.

In the above embodiment, step 4? in FIG. The cleaning routine as shown in j is executed when the humidity of the fuser 32 is below 60°C and when the copy counter reaches 5000 sheets or more. Good too. That is, if the fuser 3z is operated at a temperature of 60° C. or lower, the charging wire is cleaned at least once a day, and if the operation is executed when the copy counter reaches 1- or more than 5000 copies, a large number of copies are If this is done, the charging wire will be automatically cleaned during the copying operation.

It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, the cleaning routine is set to the temperature of the fixing unit, which is 60°C, but even if the temperature is other than this, It would be fine if the temperature of the fuser could be determined, and the cleaning routine was executed when the copy counter reached 1- after 5000 copies, but a;? '1 [The f〆i of the counter may be changed as appropriate if it is the number of sheets with dirty lines.

(Effects of the Invention) The image forming apparatus according to Jl. has the configuration and operation described in 1- below, and what happens when the temperature of the fixing device is below a certain temperature when the power switch is turned on? Since the i'f electric wire is cleaned, the charging wire is cleaned at least once a day, and stable and clear copies can be obtained at all times. Further, it is possible to omit the troublesome task of cleaning the charging wires, which is performed by service personnel during periodic inspections.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control system showing an embodiment of an image forming bag according to the present invention, FIG. 2 is a schematic diagram showing a cleaning means in the same embodiment, and FIG. 3 is an FTi image to which the present invention is applied. FIG. 4 is a JIj forming cross-sectional view showing the entire embodiment of the forming device; FIG.
5 and 6 are flowcharts of the control system in the same embodiment. Explanation of symbols 32...Fuser 100...Main body 501.
-Central processing unit 510...Cleaning means 511...
Temperature control means (detection means) Country F, Figure 2, Figure 5, Figure 6, hand 5V, 11 official text (method, spontaneous), October 15, 1985, Commissioner of the Patent Office, Kuro 1) Akio Tono 1, Incident Display Patent Order No. 169219 of 1985 2, Name of invention Image forming device 3, Person making amendments/Relationship with 19 cases Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name
(-100) Gyanon Co., Ltd. Representative: Ryu Kaku Sanbe 4, Agent: 105 Address: Shinbashi OWK Building 5, 3-5-2 Shinbashi, Minato-ku, Tokyo
Floor 6, subject of correction Drawing 7, content of correction

Claims (1)

[Claims] An image forming apparatus characterized in that a temperature of a fixing device is detected by a detection device, and a cleaning device is operated to clean a charging wire when the temperature of the fixing device is below a certain temperature when a power switch is turned on.