JPS6060670A - Fixing device - Google Patents

Abstract

PURPOSE:To obtain high fixation characteristics stably for a long period even in high-speed processing by providing a roller for fixation processing with a surface layer of an elastic body, and destaticizing the roller with a member which comes into specific contact. CONSTITUTION:A fixing roller 1 and a pressure roller 2 have elastic layers 11 and 21 on their surfaces respectively, and the space S' formed when recording paper P supplied with toner T is clamped is reduced to limit the scatter range of toner T. This roller 2, etc., are destaticized stably for a long period by the grounded destaticizing member 8 whose tip part A and flank part B contact the surface to prevent the negative high-potential electrostatical charging of the roller 2; and toner scatter parabolic lines D converge on the recording paper and a toner offset is decreased. Consequently, the stable fixation characteristics are obtained for a long period even in high-speed processing and an offset-free image of high quality is formed.

Description

Detailed Description of the Invention [Pre-Technical Field] Mizumotori is a recording material that supports toner images, latent images, etc.
The present invention relates to a fixing device that fixes one object.

[Prior art]

Conventionally, the main fixing device for recording apparatuses that has been widely used is a roller fixing method using heat and pressure.

In recent copying machines, a limited power of 100 (V) and 15 (A) must be distributed to maintain good fixing performance. However, in an apparatus that requires high-speed fixing, continuous feeding of paper increases heat loss, and there are cases where the heat supply cannot keep up. In this case, in the past, the apparatus had to be temporarily stopped and the roller surface temperature recovered, otherwise fixing failure would occur.

However, this suspension causes discomfort to the user and is not desirable.

In addition, the roller surface that comes into contact with the toner image is made of PTFE (
A rigid surface layer, such as a polytetrafluoroethylene (polytetrafluoroethylene) or PFA coating, is provided to prevent offset. However, since the surface layer is rigid, the toner image is crushed, resulting in a decrease in sharpness 7jΣ. For this reason, when an elastic rubber surface layer is used to improve image quality, toner scatters around the image due to continuous paper feeding.
It becomes something that cannot withstand copying by grandchildren.

It is true that a releasable rubber layer such as silicone rubber is more effective in preventing offset on the surface of a roller made of PTFE, PFA, metal, etc., but on the other hand, it is difficult to clean offset toner from the rubber surface once offset has occurred. It looks like an axe.

Although the rubber surface has a high offset prevention effect, it cannot prevent offset toner from adhering to the rubber surface during one use.

In addition, Genmei of Japanese Utility Model Publication No. 57-41793 has also proposed focusing on the curvature charging of the roller surface and removing the pressure roller surface. If it adheres to the tip of the removal needle, it loses its effect at all and is not practical.0 [Purpose] The purpose of the present invention is to achieve stable fixing properties44) even with I"iiJ7 processing, and to eliminate the source of offset. It is an object of the present invention to provide a constant reservoir device Tj that can dramatically prevent the above effects, maintain the preventive effect over a long period of time, and minimize image collapse and toner scattering around the image.

The technology of the present invention provides an electrically conductive release material on the surface of at least one of the first and second regulating rollers (preferably, the roller that is charged to a high potential among both rollers) has an elastic surface. It is characterized in that the tip of the tip and the drawing part of the side of the tip are in contact with each other.

[Implementation row]

Embodiment 11 of the present invention will be described in detail below with reference to the drawings.

An example of an 11-circle photographic device to which the present invention is applied will be explained in FIG. 1, and then examples of each actual rotation will be explained.

The photosensitive material for forming an electrostatic latent image and the forming process shown in Figure 1 are based on those described in Japanese Patent Publication No. 42-239] No. 0, but are not limited to IL and VC. , Special Publication No. 44-2040, No. 42-1
No. 9748, No. 43-24748, No. 45-
No. 37957, No. 49-27048, No. 44
-13437 Publication, Publication No. 45-24077, Publication No. 4
Publication No. 3-17947, Publication No. 45-25236 (M
lOther known methods can be applied. 15-1 Add an explanation about the device shown in 1.

The photosensitive drum 9, which has a photosensitive layer provided on a metal cylinder, is uniformly charged to a positive band 1'' by a negative charging device IO, and then is charged by a secondary charging device 11 that charges the polarity opposite to that of the primary charging device 10. At the same time as it is reprinted, the lamp 12 irradiates the original iron, and the optical system 13 applies this light image to the photosensitive layer C.

This causes the light image to appear on the thorny layer on the surface of the photosensitive drum 9 depending on the turn of the surface '1u? By forming an electrostatic latent image based on the difference between 'f' and 'j, and then exposing the entire surface of the photosensitive plate in one direction using the full exposure lamp 14, the surface ? , L position to form a contrast still latent image, and then the developing sleeve 15. in the developing device 15. Due to frictional charging with the toner, the 7d particles are developed and visualized by the negatively charged toner. The development process is described in Japanese Patent Application Laid-open No. 1983
-1i3656, special rj No. 18657, special U1] No. 18678, JP 55-18679
The development method or device based on the following is used.

Next, a transfer charger 18πrh is placed on the back side of the supporting material 17 such as paper supplied from the toner image cassette 16, and the photosensitive material is applied to the back surface of the supporting material 17 such as paper supplied from the toner image cassette 16. The visible image on the drum is transferred to a support material 2, and the transferred toner image is heat-set A1 by rollers 1 and 2. The drum 9 is cleaned by a blade cleaning means 19 and reused.

FIG. 2 is an enlarged view of the attachment part of the electrophotographic dust 1fflt: in FIG. 1.

In Fig. 2, 1 is a fixing roller that has a heating heater 3 such as a halogen heater inside.
It rotates in the direction of the arrow in response to the driving force from. Reference numeral 2 denotes a pressure roller, which is brought into pressure contact with the fixing roller 1 and rotates by sliding. Is this fixing roller l made of aluminum, stainless steel? (,!
1st prize money7. -4. ”, fj'4 1 on the outer circumferential surface of the hollow roller core 12 (, TV silico/ko°).

1tt voice of LTV silicone rubber,) ITV silicone rubber, fluorosilicone rubber, furan rubber, etc.! V! Telephone:
1 (IJ, ), r(-), the elastic layer 11 is made relatively thin (
(several microns to several tens of microns AV degrees).

The pressure roller 2 is rotatably supported by a bearing (not shown). This roller 2 is pressed against the pressure roller 1 by a known pressure means at least at a constant pressure U, and the outer peripheral surface of the metal roller core 22 is coated with silicone rubber, fluorine rubber, etc.
A relatively thick (about several layers) elastic layer 21 made of fluorosilicone rubber or the like is provided. Alternatively, it is essential to secure a pressure contact area (nip portion) with the heating roller. VJ and thermistor are installed on the outer peripheral surface of heating roller 1.

A hot equivalent temperature-sensitive window 4 is installed by welding, and its detection signal is known! until f1i11 (not shown), and the temperature of the outer peripheral surface of the heating roller 1 (by changing the output of the heater 3 or the voltage of the mark 7JIJ, etc.) until the toner image melts. keeping. 5+, 52
1'j: This is a distributing claw that reliably separates the copy paper from the roller after it has been laid.

6 is a Nomex cleaning member that removes foreign matter such as offset toner and paper dust attached to the heating roller surface from the roller surface.

h) A cleaning web 61 made of a heat-resistant nonwoven fabric such as Roa is used.

Top 6 cleaning web 6. Hasilicon comb.

A pressing roller made of fluoro rubber, fluorosilicone rubber, silicone rubber sponge, etc. is in contact with the heating roller at a temperature of 6.1°C. This web 6 is also driven by a winding roller 6. (From fC, supply roller 6
The cleaning web 61 is moved in small stitches from 2 to change its contact: f; 7Ci guide plate 08, which is tilted upward so as to guide the copy paper P carrying toner 1 to the heating roller 1 side, is a conductive needle-like member as a weight removing member, and the direction of rotation of the pressure roller 2 is 4, near the pressure contact portion of the heating roller and the pressure roller, and on the lower side of the pawl 52 (which contacts the surface of the pressure roller 2 and prevents the pressure roller 2 from being charged. The acicular needle-like material is attached to a grounded support 8, which is commonly used, and one end of which is fixed to the support 8, and the tip A of the other end. and a large number of flexinople 〉1゛-shaped γ1; It is made of isoelectric fibers made of a single substance such as or a mixture or hybrid of such single substances, and each fiber J, j4 diameter is 1.
It is within OOμ. Furthermore, this stain forming member 82 is subjected to a force J
Several rows (three rows in this example) of $, 6' in the rotation direction of the pressure roller.
, I male bundles are stacked on 1111, and the contact state of 〇 in which the pressure roller is in contact with the entire longitudinal direction of the pressure roller means that the conductive needle-shaped portion ion is in contact with the rotational direction of the roller. Ahead of O;
1″, 1, ff4j After the first surface comes into contact with the roller surface,
4,1: The first part of the S11° shaped member is in contact with the roller surface. This contact pressure is applied to the needle member 8
Flexibility of □: For 1 piece ↓, the side surface and the tip of the tip are curved on the roller surface. It is preferable that the pressure is necessary for making a soldering contact. The means (d) may be any pressurizing means or means for setting the position from the roller cloth 1iij of the support body 81.

Among the four images mentioned above, Sadao Issei was very good, and very little offset and good image quality were obtained. The reason is shown below.

>q 3171(a) is constant; Fi roller 1,
Rigid edge 1ffl made of PFA etc. 1: As a roller, pressure roller, HT ■ Elastic surface made of silicone rubber 2. FIG. 2 is an enlarged schematic diagram of the nip portion between both rollers when copy paper carrying a toner image is fixed in a conventional VC using rollers. Copy paper P carrying toner image T
However, if there are 3 (fi people) between the roller pairs, the toner 4 (1, Ill upper 1', 41r-j) in contact with the fixing roller L will receive heat from the fixing roller and will immediately undergo malacia 1. increases the cohesive force of the copy paper (the side closer to 1111,
That is, below 1. In order for the spring toner to receive enough moisture to soften and melt, it is usually 1/100 to 5/100.
It takes about seconds.

At the time of entry, by being caught between the pair of rollers, a layer of toner at the periphery of the image collapses or is thrown out. This h foot 7 loaf roller surface l:, copy paper P
,) Nah painting! (d, air gap S as shown in the figure)
Since it occurs on the 7' surface of the rigid body, its loss is also large; it spreads to the circumference of the head.

Before the softening and melting, the space S is
The toner (mainly considered to be the toner in the lower layer) that is pushed out or collapsed on the shell is caused by force due to the action of the electric field formed by the foot roller, the copy paper, and the pressure roller. receive.

In the above-mentioned 4-component fixing device, the pressure roller is charged to a high negative potential due to its small capacitance, so the direction of the total electric field is upward, and the unmelted toner in the gap is scatters onto the copy paper or onto the fixing roller while tracing a parabolic trajectory 0 as shown in the figure.In other words, in FIG. 3(a), since the gap S is large, the heat transfer efficiency to the toner is poor; , the fixing property is poor.In addition, the undissolved toner pushed out into the gap is affected by the electric field (in this configuration,
Due to the action of (the charging of the pressure roller is dominant), copy a
It scatters onto the IP and fixing roller l.

That is, there are many offsets and the image quality is greatly degraded. Therefore, it becomes necessary to increase the speed of the cleaning web 6, which is uneconomical in terms of cost.

Next, in the stripe 3 (b), the foot roller 1 is a roller with a relatively thin elastic layer 12 such as HTV silicone rubber, and the pressure roller 2 is a roller with a relatively thick elastic layer 12 such as HTV silicone rubber. - Enlargement at the nip section when copy paper carrying a toner image is fixed in a conventional system that only uses rollers (1st, y-th type. In this case, 1st position above the fixing roller) ' Since it is a toner body, the toner convex part t on the copy paper
'Since the roller is shaped and the gap S is much smaller than that shown in FIG. 3(a), the heat transfer/AJ ratio to the toner is good and the adhesion is very good.

However, the pressure roller is
The image scatters because it is charged. For these,
In the enlarged view of the second actual melon example of the present invention;
lJ), j, 1': A hypoelectric needle-shaped part formed on the elastic surface layer 21 of the pressure roller, which has been subject to a high potential for a long time, has a tab 2 when viewed from the direction of rotation of the pressure roller. @ Beyond 82/11^1l
The parabolic curl is concentrated on the copy paper L by sequentially bringing the ls A into contact with the leading end side portion B, removing the top of the pressure roller. Therefore, toner offset to the fixing roller 1 can be greatly reduced, scattering can be prevented, and high-quality toner can be produced.
Therefore, it is possible to maintain good quality for a long period of time. First, conductive needle-like member 8. After the tip side part B of the conductive needle-like member is brought into contact with the pressure roller, the tip y) of the conductive needle-like member is smoothly brought into contact with the pressure roller, so that it adheres little by little on the pressure roller. Even if toner, paper powder, or other foreign matter lands on the side surface of the tip of the conductive needle-like member, the distal end of the conductive needle-like member is very clean, so the static elimination ability will not deteriorate over a long period of time. For example, in the past, 4j = the tip of the electrically conductive needle member)! In the case of tip contact, where the hIi part is brought into contact with the pressure roller (lol Kosho 57-417
93, etc.), initially there is a good static neutralization effect and there is little offset, but as the number of copies increases, the tip of the ηγ't four-core needle-shaped member becomes contaminated with toner, paper dust, and other foreign substances, and the static elimination becomes rapid. J+ j4Q force decreases.As a result, toner offset to the fixing roller and scattering rapidly increase0. .

In Figure 2, a 0.3 mm thick (7 bar) aluminum core bar with a wall thickness of 7 bars is
) A fixing roller with an outer diameter of 60 m coated with HTV silicone rubber and an HTV with a wall thickness of 5 mm on a stainless steel hollow core metal.
Using a pressure roller with an outer diameter of 60 mm and covered with silicone rubber, both rollers were pressed together at a total pressure of 60 mm and rotated together.
3 size Ilr: 300cm of toner can be processed per i sheet, 23 sheets/min (roller circumferential speed 27
Copying was performed at a speed of Q Hq+n/sec).

Still, the pressure roller was used by contacting the tip side and tip of a large number of conductive needle-like members 8 □ with a wire diameter of 5 μm.
Also, from the tip of the needle-shaped member (from the nip part), the amount of offset toner after 99 sheets are continuously fed is:
It was 0.04%, which was less than 0.04%.Also, even though the web heat was at a very low speed of 0.5+ra/min, the cleaning ability had a surplus and a good cleaning was obtained.

Also, I was able to obtain high-quality copies without any image disturbances such as 1" I! L. At this time, the number 1 of copy paper was:
+240V, the potential of the fixing roller is -11100V, the potential of the pressure roller is -1200V, and a downward electric field acts on the gap S formed between the fixing roller, the toner image, and the copy paper in the nip section. .

(Comparative Example 1) Next, as Comparative Example 1, the structure was exactly the same as that of the above embodiment 111 except that the conductive needle member 8 was removed from the above structure.
Copying was carried out under the following conditions.

The amount of offset toner after 99 sheets were continuously passed was 0.10%, which was 2.5 times as much offset toner as in Example 1.

Manoko, there were not too many skips on the first page, but as I continued copying, the skips increased significantly and the image quality deteriorated. The potential of the pressure roller for the first sheet was -4,000V, but it was found that the potential of the pressure roller for one sheet of 99 sheets was rcM10,000V.

That is, a strong upward electric field acts on the gap S' formed between the fixing roller, the toner image, and the copy paper in the nip, and an upward force acts on the toner at the edge of the image, causing the third
On the parabolic trajectory shown in Figure (b), toner scatters and image blur occurs. In this case, the toner layer spreads due to the pressure between the rollers at the end of the curve as shown by the broken line in the gap in FIG.
-La, toner scattered on the copy paper (・yo, real 11',
, x on lI! J image will not be distorted or offset.

Further, the spread of the toner, that is, the swell of the toner image, is slightly higher when the fixing roll is a 1/111 roll.

However, since the fixing roller 1 is made of an elastic material, the gap S' is narrower than that of a rigid roller such as Teflon, and the adhesion between the fixed knob roller and the toner is good, and the heat transfer mechanism to the toner is good. , the toner melts in the bath, the toner particles tend to have a cohesive force, and the layering properties are good.
The toner offset caused by force (as described in Example 2) is smaller than that of a rigid roller. However, as mentioned above,
Splashing occurred.

(Comparative Example 2) As a fixing roller, 30 mm was placed on an aluminum core metal with a wall thickness of 7 mm.
An experiment similar to that of Comparative Example 2 was conducted except that one coated with PFA (Teflon) with a μm thickness was used, and the amount of offset toner after 99 sheets were continuously passed was as large as 0.60 ml.

The pressure roller surface potential is still -several hundred thousand V (-70V for the fixing roller, +230V for the paper), and the unmelted toner in the gap S is on the fixing roller.

An upward force formed by the copy paper and the pressure roller
As shown in the third depression (a), it was confirmed that the particles were scattered onto the image stretcher and the constant 'A''i roller due to the field.

In this example? Although the needle-like member ``T'' is provided only on the pressure roller side, it may be provided on the fixing roller side if necessary. In addition to the needle-like members shown in this embodiment, those shown in FIGS. 4 to 11 may be used as the needle-like members.

[Other Examples]

Figure 3 is excluded. ``An enlarged view of the main part of the first embodiment of the a member 82:''
It is a T+ side view. Multiple flexible static eliminating members 82
For each of them, an insulating material such as epoxy paulownia resin is applied to one side of the 4'IIJ part 32a made of tetraelectric fibers such as metal fibers or carbon fibers. The insulating portion 82b is formed by discharging the electricity.These static eliminating members 82 are arranged in multiple rows and extending in the longitudinal direction of the pressure roller 2, with their tips aligned in the rotational direction of the pressure roller 2. b f
f3+17. The tip of the portion 82b comes into contact with the surface of the pressure roller 2, and the tip of the conductive portion 82a comes close to or comes into contact with the surface of the pressure roller 2. Note that the surface of the pressure roller 2 is generally rough, with a surface roughness of 5 μm to 20 μIll, and therefore is schematically illustrated as uneven.

In this example, as mentioned above, static electricity removal (7B material 82 is conductive 1
Not only the first part 82a but also an insulating part 82b is formed, and the tip of the insulating part 82b is brought into contact with the surface of the pressure roller 2.
and,'! The tip of the Z 111 portion 82a is close to or in contact with the surface of the pressure roller 2. In addition, the absolute A part 82
Toner, paper powder, oil,
Other substances that easily attract dirt, i.e. i'+1
An insulating material such as epoxy resin can be used as a material with poor moldability.

ilf means that even if fine dirt such as fine toner powder that cannot be cleaned by the cleaning web 61, oil, or other foreign matter adheres to the pressure roller 2, the insulating portion 82b will not clean it. Since the dirt from the conductive portion 82a is completely collected and adhered thereto, the leading edge 11 of the conductive portion 82a is always clean. Therefore, the iL ability does not deteriorate over a long period of time.

1/This, as another effect, as shown in Figure 3, the tip of the conductive part 82a and the convex body; 7ζ pressure roller 2
An inequality boundary E is formed between . That i・
``d-stunned, ``fd field strength increases?'''j,!,;,
An i-to phenomenon occurs in the electric charge of the gas near the tip of the portion 82a, and the positive and negative ions are stopped there, and among these ion pairs, the positive ions are transferred to the pressure roller 2 and reversely (the positive ions are transferred to the 7I11 pressure roller 2). After being dragged away, the seven 1iJ units immediately in front of it were neutralized and removed.

Next, the contact position of the tip of the +i1 member 82 against the pressure roller 2 is set at 55° downstream from the nip portion as 6 while the rotation axis of the pressure roller 2 is rotating. By changing the contact position in various ways, 99;! , q (H, i, Offset toner i1j' (Or) and pressure roller table m when paper is passed) The toner position ('V) is shown in Table 1. The conditions are the same as those in the above-mentioned actual case.Also, the position O of the tip of the removal member 82, the pressure roller 2
The rotation axis is the center of rotation, and the angle at the abutting position trench is shown from the nip section toward the downstream. Then, as is clear from Table 1, 1) Length I: 1° The closer the tip of the first table member 82 is to the paper discharge (i11i nib 1-6, the more the offset toner amount and pressure roller table 71
1? It can be seen that the value of 1.g is reduced, and the 1u effect, that is, the offset prevention effect is excellent. This occurs between the copy paper and the pressure roller 2 at the nip and the nip exit.
This means that the faster the static charge is removed, the more effective the static removal effect will be.Therefore,
1. Nip the tip of the static eliminating member 82 as much as possible.
By bringing them closer together, it is possible to obtain an extremely strong static elimination effect, that is, an offset prevention effect.

Figure 5 shows 4. of Akira Hon. It is an enlarged y':Jj 1fji diagram of a part of the real wild goose example of the static eliminator 82 with the f characteristic. In the above example of actual performance in Fig. 4, the pressure roller 2 of static elimination t15 and
and this J≦'l [11 West 1] only, 13 to cram school part 8
2b was formed, but in the second column 1t4i1flft, the insulating part 82b was also made 1mm thick, and the F
;4 Mi'W□: Only the tip anchor 1 of the member 82 has the conductive part 82a 1
+'7r is the 7th greeting. By doing this,
Remove 'Iff member 82 piece 1. 'I'l mouth'n is toner,
Even if the distal end part (distance between part 82a and the pressure roller 2) becomes dirty with paper dust, etc. and the static elimination ability decreases due to an increase in 1ffi, it is possible to turn it over and use the other (nl1 side) , it is possible to double the service life of the static eliminator 82. Therefore, it is possible to achieve an excellent static eliminator effect for a long period of time twice as long as in the case of 11. .

In the embodiment shown in FIG. 6, the static elimination member 8 shown in the embodiment shown in FIG.
In the tip vicinity portion 82 c K of No. 2 , the conductive portion 82 a is exposed and brought into contact with the surface of the pressure roller 2 without forming the insulating portion 821 ). By doing this, in addition to the static elimination effect due to the ion pairs generated by the ionization phenomenon described above, the electric charge of the processing roller 2 is removed from the tip vicinity portion 82C by 7J.
Since the current flows as a leakage current through the conductive substrate 81, the static elimination effect is further promoted.
better results can be obtained. Therefore, the tip E.1++ vicinity portion 82c is brought into contact with frli at a position 55° downstream from the nip portion of the surface of the pressure roller 2, and the same 99 sheets j7 as above are printed!
When one continuous sheet feeding was carried out, the amount of offset toner was 0.13% (pressure roller surface potential -950V), which was 0.15% of the embodiment in FIG. 4! It has been demonstrated that a greater effect can be obtained compared to the previous one. In this embodiment as well, by forming the insulating portion 82b' as shown in FIG. 5, the service life of the removal member 82 can be doubled.

In the embodiment shown in FIG. 7, the pressure roller 2 and the insulating portion 82b are
A large number of holes are formed on the surface of the conductive hole 82d. In this way, the pressure roller 2 and the copy paper are at a high potential due to the high potential. , an ie field is formed at 101 with the conductive hole 82d. The result 1. When the field strength increases, a gaseous electric phenomenon occurs near the hole 82d. Positive and negative ion pairs are generated there, and among these ion pairs, ions with opposite charge to the pressure roller 2 are attracted to each other by the pressure roller 2, and the electrostatic charge there and 1fli! i, neutralization and division by 1u are performed. This can provide a double static elimination effect in conjunction with the static elimination effect in the front drum 1-1 of the front member 82. Great material for the insulation part 82b! As t, 'ea' + 4 In the embodiment shown in Fig. 4, epoxy 1 ++ was used, which easily collects dirt such as toner and paper powder on the pressure roller 2, but in this embodiment, conversely, 4 epoxy was used. Ethylene fluoride (!
1 (P3 with excellent peeling properties from fat, etc.) By using the ψ substance, it actually eliminates minute stains: II! L:ia can be kept clean and the electrified rim 82d can be kept clean by 1.611 times.

Therefore, over the length j9J, the force or low F
There's nothing to do.

Therefore, the division of the real phase fall shown in FIG.
, concrete experimental results using the member 82 will be shown, and the effect will be confirmed. Real j! jjf+content is ε7>
Offset toner after 99 sheets and 100,000 sheets as in Example 1: i'1. '
f −J (meta. Static elimination member 8 used in non-experiment: ljl
, 4゛'' l diameter 5μIn gold, conductive wire made of x, 1,
On one side of the portion 82a, 7 μm thick ethylene tetrafluoride 74
After forming a color r:=t: +; B 82 b with a suspected oil, a large number of conductive holes 82 d with a diameter of 1 to 3 μm are opened in the insulation Ru 821). Others are 4th
The A:r'f results are shown below.

Table 1 shows the offset toner 4□t after 99 sheets were continuously fed. Note that the offset toner kt was calculated using the following formula in the same manner as in the Heshi 1× Example.

Further, the surface potential (V) of the pressure roller 2 is in a close relationship with the amount of offset toner. In the case of this example (excluding "
+'il (It can be seen that Offcera 1 Totoner-Hn is reduced to 7 or less compared to the case where there is no member.

Furthermore, even better results are obtained when compared with the embodiment shown in FIG. That is, the exclusion '111 of this example
7; This is because the conductive holes 82d formed in the Is material 82 further promote the static elimination action and completely prevent offset over the length JυJ.

In the above experiment, the pressure roller 2 at the tip of the static eliminating member 82
The contact position of the pressurizing roller 2 was set at 55° downstream from the nip portion as the center of rotation of the pressure roller 2.Next, 99 sheets were passed continuously by changing the contact position of the roller 2 in various ways. Table 2 shows the offset toner meter (f) and the pressure roller surface potential (V) when printing paper. Note that the experimental equipment and conditions were the same as in the experiment described in rtiJ. In addition, the position of the +r section is 4 times as the pressure roller 2 rotates.
The angle is shown from the nip portion downstream to the contact point 11'1 with rotation center 111 as the center of rotation. Then, from Table 2, it is clear that the name of the tip of the static eliminating member 82 is as shown in Table 2! As tl approaches the vicinity of the paper discharge side nip, the offset toner ij+ and pressurized cola surface potential decrease, and 7. It can be seen that the effectiveness M,s, that is, the offset prevention effect is excellent. this is,
As in the case of the embodiment shown in FIG. 4 (shown in Table 1), the static electricity is removed as quickly as possible to remove the friction t7 peeling charge between the copy paper and the pressure roller 2 that occurs at the nip part and the nip part exit. I'm looking forward to the increased effectiveness. Therefore, excluding
By bringing the tip i1N of the di member 82 as close as possible to the nip portion, a higher static elimination effect, that is, an offset prevention effect can be obtained.

The embodiment in FIG. 8 applies the technique shown in section 51. In other words, in the embodiment shown in FIG. 7, the insulating part 82b and the hole 82d are formed only on the side surface of the static eliminating member 82 that comes into contact with the pressure roller 2, whereas in the embodiment shown in FIG. The portion 132b and the center+if hole 82d' are formed, and only the tip of the static eliminating member 82 is 2'J+'Ii,i, part 8.
2a is exposed. By doing this, even if one side of the removal member 82 becomes dirty with toner, paper dust, etc. and the removal ability is reduced, by turning it over and using the other side, the removal 'Lri, ;5 member can be removed. 82 can be doubled.Therefore, it is possible to achieve an excellent static elimination effect for twice as long as the example 71ai in Fig. 7 at a small cost.

The embodiment shown in FIG. 9 is based on the embodiment shown in FIG. 6, and the electrocardiographic part 82a is exposed without forming the insulating part 82b in the vicinity of the tip 82c of the static eliminating member 82 shown in the embodiment shown in FIG. By doing so, in addition to the static eliminating action by the ion pairs generated by the ionization phenomenon described above, the bands '+jj' and r of the pressure roller 2 are
'', 1. The load is transferred from the tip vicinity part 82C to the electrocardiogram section 82a, and the conductor'
5 (J, because it flows as a leakage current through the sexual substrate 81 (), the static elimination effect is promoted and even better results are obtained. The offset toner meter was set at 1.j at 55° downstream from 4.'ρ, and 99 sheets were continuously passed through 4't as described above.
It was demonstrated that a larger effect can be obtained compared to 0.13% in the example shown in FIG. Furthermore, in this embodiment as well, as shown in FIG.
By forming d', the service life of the static eliminating member 82 can be doubled.

FIG. 1O is a front view showing the main parts of another embodiment of the present invention. 25 In addition to a large number of flexible needle-shaped charge-eliminating members 82 on the conductive substrate 81, another needle-like charge-eliminating member 8 is provided to eliminate charge in the area near the nip where the copy paper is peeled off.
3 were buried in large numbers. The static eliminating member 83 is the same as the other neutralizing member 82,]? In addition, it is made of a flexible metal fiber or carbon i-fired fiber coated with a 4π-absolute material on one or both sides. The distal end of the static eliminating member 83 is arranged such that the FA section is close to the portion near the nip section where the copy paper is peeled off. Note that it is preferable that the diameter of the static eliminating members 82 and 83 fd% is within 100 μm. In this embodiment, since the charge is as described above, in addition to the charge elimination effect by the charge removal member 82 as shown in the previous embodiments, another charge removal member close to the copy paper peeling area near the 1 nip portion is used. 83
The electric charge caused by the phenomenon occurs, and the ion pairs generated in the vicinity produce a static elimination effect.Therefore, first, the
-L'+'iiiI material 83 quickly removed the charge when the copy paper and pressure roller 2 were separated, and then the other charge removing member 82 was unable to remove the charge completely with the charge removing member 83. The residual charge on the surface of the pressure roller 2 is further removed. Therefore, a very sharp static elimination effect can be obtained.

Therefore, the static eliminating member 82 of implementation σ11 shown in FIG.
The effectiveness of the present invention will be confirmed by showing specific experimental results using other static eliminators 83. The actual contents are the 1st
As in the case of implementation σ11, the amount of offset toner was calculated after 99 sheets were continuously passed and after 100,000 sheets were continuously passed. Static elimination members 82 and 83 used in this experiment (wire diameter 5μ+])
An insulating part is formed by coating one side of a conductive part made of Tobon fiber with an epoxy resin having a thickness of 7 μrn.

Other than that, the experiment was carried out under the same conditions as those in the first and fourth embodiments. The results are shown below.

Table 1 shows the results of the offset toner after 99 sheets were continuously fed. Incidentally, for the offset toner, iYI'4''.l, was calculated using the following formula in the same manner as in the example shown in 24L 4 g7.

The surface potential (V) of the pressure roller 2 is closely related to the amount of offset toner.

It can be seen that in the case of this example, the amount of offset toner is actually reduced to less than 100 compared to the case without the static eliminating member. However, in the case of FIG. 4, the number of charges decreased to about 7, and this embodiment has a remarkable ability to remove static electricity. In other words, the reason why this embodiment exhibits the above-mentioned noticeable offset prevention effect is that in addition to the static eliminating member 82 used in the previous embodiments, the copy paper peeling area near the nip portion is removed. This is because another static eliminator 83 was used for the '+J'i removal, and by performing double static elimination in this way, the defrosting action is further promoted and it is possible to prevent offset over a long period of time. This is because it has become.

In addition, in the above experiment of this example, the static eliminating member 82
Contact position of the tip with the pressure roller 4! %: was determined from the nip r<+S with the rotating shaft of the pressure roller 2 at the center of rotation, but as in the case of FIG. Of course, by placing it as close to the nip as possible, you can directly obtain a high static elimination effect, that is, offset prevention effect (!).

It's 1 as shown in Figure 7 or 8 [≦j, and even in non-implementation +4/II, there are many beaches in the static eliminating member 82.
By forming the holes 82d and 82d'', the offset prevention effect can be further enhanced.
As shown in FIG. 6 or FIG. 9, a portion 82c near the tip of the static eliminating member 82 (tc furnace KrzI! 82b is not formed, and the U7 portion 82a gold is discharged from the φ). , even better effects can be obtained 11-).

FIG. 11 is a front view showing the technical part of another embodiment of the "misfire". In this embodiment, instead of the static eliminating member 83 in the 11th example, an insulating part i'j! closest to the bending part of the i member 2 or the nip t;5 is used. 82
(b), a large number of narrow conductive holes 82e are formed to effectively eliminate static electricity in the area where the copy paper is peeled off near the nip portion. By doing so, first, the conductive hole 82e quickly eliminates the charge that separates the copy paper from the pressure roller 2, and then the tip of the static eliminating member 82 quickly eliminates the static charge from the electrical hole 2e. Since the remaining charge on the surface of the pressure roller 2 is further removed, a very effective charge removal effect can be obtained.

In this case, the position of the tip of the removing member 82 can be brought closer to the nip side, and a more excellent static eliminating effect can be achieved.

In one example, epoxy resin and polytetrafluoroethylene (hereinafter referred to as PTFg resin) were used as the material for forming the insulating part 82b. Good results can also be achieved with substances other than these. For example, phenol 4y + sword!?
, polyimide (resin), polyamideimide resin, PPS resin, PFA sesame oil, acrylic resin, AB8 resin, polyester resin, polyethylene resin, polystyrene resin, etc. can be used, and these can be filled with glass, etc. Even those with additives added are acceptable.Among the above substances, epoxy resin, P'l'F13 resin, phenol resin, polyimide resin, polyamide resin, polyamideimide resin, PPS resin, and Pli' A 1J4 resin are heat resistant. The material is suitable for a heat fixing type fixing device because of its properties, but other materials are effective for a pressure redundant type foot layer device. Static elimination member 8
When the conductive part 82a is exposed only near the tip of 2 and the part of the song is covered with the insulating part 82b, it is easy to collect dirt from tt, I-, toner, and paper #. ,
In other words, epoxy resins with poor mold releasability are suitable, but
No. 71. 1. As shown in the example in Figure 9 of IJ to Magazine. monk edge 82
In the case where a large number of micro conductive holes 82d are opened in 1), it is easy to allow micro contaminants to pass through.
In other words, P T Ii' E3 resin, P
1' A resin etc. is preferable. When covering with the above insulating material, the thickness is 500μ! Within n is good;
In particular, very good results can be obtained within 50 μm.

In other words, in each of the above embodiments, the three recessed portions 82a are covered with an insulating material to form the insulating portions 82b, and the insulating portions 82b are attached to the static eliminating member 82.
However, in this way, the insulating part 82b is not conductive. 1st part 82a
It does not need to be integrated with the conductive part 82a (7): An insulating film separate from the outer part 82a may be used as the insulating part 82b, and it may be used in close contact with the conductive part 82a. By doing so, even if the static elimination ability is degraded due to the insulating part 82b becoming dirty with toner, paper dust, etc.
Since it is a different rA'i a☆ film from 2a,
By replacing only the insulating part 82b with a new one,
In addition, it is very convenient to be able to recover lost power, and it is also economical.

The material 821 does not necessarily have to be acicular and flexible, and can have various shapes and materials, but it must be acicular and flexible. can be said to be the most favorable condition.

The static eliminating member 82 in the above examples of FIGS. 4 to 11 is a toner,
Since it is paper first, it is almost never contaminated by oil etc.
Therefore, it is extremely unlikely that the static elimination ability deteriorates over time due to long-term use. Therefore, the pressure roller 2 is bound to a zero potential state NMhega[, so that there is no repulsive force between the toner on the top surface of the recording material 17 and the pressure roller 2. Due to the frictional charging of
The electrostatic attraction of the toner 1 image T to the P# month 17 is JW + 7 and its bulge ν), and the toner image T is heated roller 1 (+(I
Positive offset can be extremely well prevented. Therefore, it has become possible to solve problems such as smudges caused by offset toner and poor fixing, and to maintain good stability.

The present invention described above is also effective for pressure fixing devices, and
Preferred embodiment J: The above-mentioned static eliminating member may be provided on the respective postal surfaces of the fixing roller and the pressure roller as the first and second constant τ.

〔effect〕

In addition to the above-described structure, the present invention exhibits an offset prevention effect over a long period of time and can stably obtain good images, making it practical and economically advantageous.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a recording device to which the present invention is applied, FIG. 212 is a detailed explanatory diagram of the present invention, and FIG. 433 (a)
, Fig. 3 (1) is a clear diagram to clarify the problems of the conventional method, εm3 Fig. (C) is an explanatory diagram for explaining the non-invention in detail, ε1 徲4 to 11 Fig. 1 3A and 3B are explanatory diagrams illustrating main parts of other embodiments of the invention. 1 is a fixed roller 7a, 2 is a pressure roller, 8 is a guide member, l, , 2. is 911 items no i, 81... conductive substrate, 82, 83-1115'iii member, 82 a-+ijC4i9 M 582b, 82
1)'... Fishing center, 82C... Near the tip. 82cl, 52cl', 82e = 4.9i hole.

Claims (1)

[Claims] (1) A first fixing roller having an elastic layer on its surface; and a second fixing roller having an elastic layer on its side for holding and transporting the object to be fixed g2 in cooperation with the first fixing roller. and the first roller.
A conductive material that comes into contact with the surface of the fixing roller has a tip and a side surface of the tip.
The fixed rear mounting is characterized by having an E member.