JPS58152326A - Picture forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus having a function of detecting a high density state or a dew condensation state to compensate for normal operation of an image forming mechanism.

The present invention is applicable to image forming apparatuses such as electrophotographic copying machines, facsimile machines, word processors, printers, etc. The background is electrophotographic copying, footwork, and construction.

Figure 1 shows the main configuration of an electrophotographic copying machine based on plain paper electrostatic transfer (PPC).
Copy the manuscript onto copy paper 1! -C explanation! do.

The main body of the Hj Denryo photocopying device is shown, (- F of main body 1
1. Place the original 2 on the original glass of the scanner.
The surface of the k IQ original 2 is irradiated. The image is reflected on mirror 4. ! ), an in-mirror lens 6, a mirror 7, etc., and an image is formed on the electrostatic drum 13 by optical elements.

The electrostatic drum 8 has a photoconductive layer made of, for example, selenium formed on its surface, and rotates counterclockwise as shown. Then, the charger 10 to which a positive high voltage current is supplied from the high voltage power supply section 9 (the electrostatic drum 8
The surface of the drum is electrically charged with 1 cis (A), and when the J image is formed on the electrostatic drum 8, the exposed part becomes conductive (111). disappears, and the area where the light does not hit, !J, the area corresponding to the image area is illuminated
remains (can form a latent image).

Next (, -1 triboelectrically charged) J- (h
When the electrostatic drum 1) flows from the supply mechanism 11 to the electrostatic drum 1)-1, the latent image appears. visible (9
(1 make 1, 〕〕, ゛゛゛) Store the paper ゛
171 (13f (lζ supply, 11-1-la 14 a
, 14b'(: Avoid contact with the electrostatic drum, the image of the 'Suwa group 1;)
transferred to soil.

Trans'(l ending y, :trans'q paper 13 is minute l1llll+,
It is pulled off from the electrostatic tome B by the +-ra 10, and
1-shi 17a, January) (゛Tono fixed snack mechanism 197'''X
be guided. t-:) Fixed attachment mechanism 19 d3-C4, ↓
1j[1] is applied to the copy paper 13 by the thermal heater 20 and recorded on the copy paper 13.

The remaining dirt on the electrostatic drum 8 is removed by the cleaning row 21 (111) and the next copying operation is started.

With /), the surrounding ring 1 of such an electronic photography device is 9 degrees.
When tλ is in a high humidity state or (11 dew condensation state), for example, electrostatic capacitors 1 to rams 8 may be soaked in moisture or dew.
1; Stains! /, - and 4' Rita toggles by t. ,
J, Octopus 1”, U<r 1)i tm or real IIi! If the condensation condition is achieved, the electrostatic tram (1 u Good 4f imaging is not performed and clear copies cannot be made.

Furthermore, in high humidity or dew condensation conditions, 1 to no suction occurs, which causes the toner to become negatively charged and cause the toner to adhere to the electrostatic drum 81. It becomes difficult to copy the image (-ie'iK
It becomes.

Conventionally, the means to solve this problem was to use a heater.
There is no consideration given to heating the cloth 11 and removing the inside of the main body 1. However, low? 1iil melon state・is l-) ho 1. :Question 4. L does not occur, 4?1
Since it is necessary to dehumidify the heater ζ, the temperature is low) 1 degree is high? Iiii! If the state of the air is detected by detecting the condensation state, the above-mentioned period νn Solution) Tomo Riru 22 and/Liao-(Pakiru Bakari-C
Na
'Wear.

, -'s invention detects high humidity pox condition and dew condensation condition.
ζ/ζ: This is a small schematic diagram of the main part of an IC device 7 for the purpose of preventing such a situation.

In the figure, C18 indicates the electrostatic drum shown in FIG. 22 are placed in the box.

The signal SL is detected by the switching cable 22 and passed through the detection section 23 to the amplifier 211C1i'1 and introduced into the control system 25. An example of the switching cable 22 is
As shown in the figure, a pair of electrodes 27 and 28 are formed on an insulating substrate 26 such as aluminum, and a moisture sensitive film 29 is formed so as to cover these areas 27 and 2g. This switching element 22 applies a predetermined voltage =4= to the -11'1iIi pole 28 from the power supply terminal 30, and connects the other electrode 27 to the resistor 31 by f.
For example, if the impedance characteristic is
:1=Connect to T32 node -1 to derive source or train ``end of output signal'' i33. FET
Since a2 constitutes the detection circuit 2;3, the terminal 33 is amplified +h2! Connected to the input side of j.

Therefore, when the surface of the electrostatic tram 8 is in a high Sd Ifj state or in a hazy state, the electrostatic tram 8 becomes s
F22 moisture sensitivity l5129 odor-C moisture absorption phenomenon occurs,
Along with this, the resistance of the switching cable 22 changes, and the resistance between the electrodes 27 and 28 decreases to a low resistance.
A voltage almost equal to that of the power supply terminal 30 is applied to the gate 1 of a2, and an output signal is obtained at the terminal 33 where F E -T' 32 is turned on, and this signal causes the control system 2!1 to be applied. is driven.

At this time, a variable resistor 34 is connected in series to the terminal 33 to adjust the detection level to ensure an appropriate detection level.

Specifically, this control system 25 controls drying means such as a heater for drying the area around the electrostatic tram 8. ;: Operate the drying means only when
The area around the room 11 is damp, stiff, and has condensation! n; Natsu Cb, heated and heated (, 2nd, electrostatic tono/, IHJ
Dryness 1, Compound ``lJ pot group is coming l-riko (1st part i'
t<<Tru.

The invention of the switching element (next) is 14! t
It is characterized by the use of something that is different from l'l.

An example of controlling a heating element with a relative humidity layer of 80% C will be explained below.

Fig. 4 Aizuki humid F unit after IJ switching connection (B47)
+1! +t'l: k indicates / /,: mo (f) (
, Fig. 34 1-(indication 1.-'b) corresponds to the completion of a certain relative force 1θ, this example (゛(
rU 60% or G resistance constant (゛, -fre1(
,Lll(resistance(1r1) has a characteristic of rapidly decreasing cJ-, so there is...

1. - is -]
It is said that the following advantages can be obtained by using a switching element with a cutting edge of 1.

In other words, changes to the shed, deterioration, etc.'', >C-'16
i 1'1(i (if i changes, for example 110%
The ratio 'C changes and 1. - case, the deal is broken) as shown in 1, but the relative one-time change is only a slight difference as shown by the width △, and the switching level changes significantly with respect to the phase 1 turbidity change. Since no fluctuation is observed, it is assumed to be a switching element.

1J, shown in FIG. 4, 91, sea urchin, and 1. : If moisture-sensitive threads (solid line 2) with different relative humidity-resistance characteristics are used as switching elements, the following disadvantages occur. In other words, as shown in the solid line 2 and broken line 2 in the illustration, assuming that 50% property deterioration has occurred, the base point of the relative turbidity is indicated by the width B. However, if the above-mentioned switching method is used, it will cause a large problem. The relative turbidity of the characteristics makes it impossible to perform the switching action, and stable operation becomes difficult.

In addition, in the above embodiment (10), an example was explained in which the switching element J'- was arranged around the drum (), but in addition, it may be used in places where high turbidity or dew condensation can adversely affect electrophotographic copying. l: For example, by placing the lens system, 1 to -no supply mechanism, rear paper supply mechanism 4T, etc. in the main body, the same dynamic V[, effect can be obtained as if one was installed. It will be done. Further, in order to detect the outer periphery of the apparatus main body, a switching element may be arranged outside the main body.

In addition, in the above example, an electrophotographic copying apparatus based on Atsushi's paper electrostatic transfer method will be described. The same applies to photocopying machines.

Furthermore, the present invention is not limited to electrophotographic copying apparatuses, but can be applied to remote copying apparatuses such as NOAXIMILY, and other image forming apparatuses such as word processors and printers. Therefore, by arranging a switching element in the main body of each inserted image forming apparatus and drying the inside of the main body only when a high humidity state or a dew condensation state is detected, it is possible to produce 1q of clear images.

Explanation of the explanation/l''') Obviously, this invention (1) allows the device body to detect the condensation state or dew condensation state within the main body.
Place the switching elements (-), detect high humidity or dew condensation, and dry the inside of the main unit.
2 image forming device fl゛ smell C, 'D'l :l: Sweep 'f'nge Souko is 1baf fixed match 11ii! The resistance value is constant until I decay, and the resistance value decreases by 1 (1) from a certain relative degree.

However, in a high 7II 11 degree condition or in a dew condition, the 1Tii image formation is the same as in a low humidity condition ().
(2) It is possible to provide a clear and rich image formation.

1\1, in this invention, the switching element 17C
At a specific relative humidity, the resistance value is constant, and at a specific relative humidity state, the resistance value decreases. Even if the resistance value variation V in J3 is 11:11, the variation width of each relative humidity (J, there is a slight C, which may interfere with the switching action lJ/, 1-d Drain) Never.

Further, according to the present invention, the drying means is in a high humidity state or
2. When the viscous state is detected, I operate the tl on the 2nd side. 1
Since it is 71 days ago, power consumption is also low.
I'll have to go to CFJ.

[Brief explanation of the drawing]

Figure 1 is 11! ; Paper passing electrostatic transfer 2 << p p C)
Based on this, the three main parts of an electrophotographic copying machine are shown. Figure 2 shows an example of the four main parts of an electronic photocopying machine suitable for explaining this invention. 111 Schematic diagram; Figure 3 is a partial circuit diagram, Figure 4 is the relative humidity of the switching operation.
It is a resistance value characteristic diagram. 1... Body of electrophotographic copying device, 8...
・Electrostatic dome, 22...S・Idging accumulation r,
23...detection section, 24...amplification section, 2t...
...control system. Special 911 Applicant's stock company kidnapping (・1111 made f + place 11- 躬1 fig. 7/ fig. 2 fig. 4)

Claims (1)

[Claims] (1) A switching element is placed in the main body of the device to detect humidity or dew condensation inside or outside the main body. An image forming apparatus characterized in that the resistance value decreases when the humidity is higher than relative humidity.