JPS58100167A - Supplying device for offset preventing liquid for fixation agent - Google Patents

Abstract

PURPOSE:To peform proper control over the supply amount of offset preventing liquid and to maintain durable control by providing a rotary supply amount control means which suppresses the supply amount of offset preventing liquid after supplying offset preventing liquid to a heat roll surface. CONSTITUTION:An endless supply member 24a (of felt, etc.) for supplying offset preventing liquid 23 to the surface of a heat roll 20 rotates as the heat roll 20 rotates. An elastic plate 28 is pressed against the reverse surface of a control member through a bracket 29 made of a leaf spring. A pressing mechanism forms a nip between the surface of the control member 26 and the surface of the heat roll 20 to apply the offset preventing liquid to obtain an adequate coating thickness (b).

Description

DETAILED DESCRIPTION OF THE INVENTION In the dry type fixing device of the present invention, there is provided a fixing roller that can accurately control the supply amount of anti-offset liquid supplied to the fixing roller surface. Regarding offset prevention liquid supply device〇Normally, in a copying dry type fixing device, a prevention liquid is supplied to the fixing o-ra surface to prevent the offset phenomenon, and an example of a general prevention liquid supply is as follows. , the Gonfu stomach-la method shown in 1st v4 also F! @2 In the coating reeler system of 0111#yJ, which has a configuration similar to the blade side hole shown in Figure 2, the first place is a heating roller with a built-in heater 3, and 3 is pressed against this heating roller 1. The pressure rollers are heated roller 1 and pressure roller 3.
While a copying material (for example, III copy material) 4 holding a g# image 4a passes between the two, one heat-adhesive image 4a is heat-pressed and fixed on the IIT material. Then, in order to prevent the offset phenomenon, an offset prevention liquid i made of wax, silicone oil, etc. is applied to one surface of the heating roller 1 from the storage container 5a through the penetrating material 6, Kukuda rough, and Kamefu four roller 8. This is a peeling claw for the O9 wax copying material 4 supplied by the manufacturer.

However, in the case of this application roller method, the tofu roller 8 rotates due to the difference in friction coefficient between the heating roller l and the supply roller luff that are in contact with it. It is easily affected by changes in the friction coefficient and fineness of the part, or temperature changes, and tends to cause uneven rotation. For this reason, the amount of offset prevention liquid 6 applied to the heating reeler surface is significantly uneven. '.

When the toner of the 1Ilil image 4a adheres to the 11 cloth*-ra s, a band-like liquid bottom is formed, causing an offset phenomenon.

In the blade system shown in FIG. 2, 1G is a pair of fixing rollers, and these rollers are designed to heat each other, so that the photo material 11 holding the image 11a passes through the fixing rollers 1G. R11I image 1 by
1a is heat-fixed onto the copying material 11. However, in this method, the offset prevention liquid 1 is added to the stomach 10all for heat-fixing the 1lli# image 11a.
3 is transferred in a transfer manner through one roller 10b, and the wet-off liquid 13 is applied to the penetrating material 1 to the fourth roller 10b.
It is supplied with the contact of 3 @ and this p-ra 10b
This allows the off-cert prevention liquid 13 supplied to the surface to be regulated to an appropriate supply amount by the next fixed blade 14. For this reason, for example, if toner adheres to the surface of the roller lOb, the toner on the surface of the roller lOb is
There is a problem in that the tip of the blade 14 is damaged and filed when the toner lumps are not melted during the initial rotation of the fixing p-ra 1G while heating it. be.

Nine, the blade edge of the blade 14 tends to change due to wear at the tip, and the life of the blade 14 is extremely short.
There is a big problem in terms of the labor and cost of having to replace this in a short cycle.

This invention has been made in view of the above-mentioned conventional example, and its characteristics include, in addition to the prevention liquid supply means for supplying the offset prevention liquid to the heating roller surface, the invention also supplies the offset prevention liquid to the heating reeler surface by this prevention liquid supply means. A rotary supply amount control means that can secondaryly suppress the applied offset prevention liquid supply example is provided to easily optimize the supply amount of the offset prevention liquid supplied to the heating roller surface, and to improve durability. The reason is that a certain supply amount control can be maintained.

Next, this invention will be explained based on the printing rights shown in FIGS. 3 to 5.

Figure 3 shows the outline of the company home delivery system, A is the fixing roller,
The fixing roller A is composed of a heating reeler 3G and an elastic pressure roller 21 that is constantly in pressure contact with the heating reeler 20.

The MO-layer 30 has a thin elastic layer 20a made of silicone rubber or the like on its surface, and has a built-in heat source 20b such as an infrared lamp.

Although the fixing roller A is omitted in the illustration, it is in a relationship in which it rotates in conjunction with the drive of the copying machine.
During WR motion, it rotates in the direction of the arrow shown in the figure.

Copying material 22Fi, heat-fusible 1III that completed the image creation process by copying operation! The I image 22a is held on the surface, and is sent to the fixing roller A by a feeding mechanism (not shown).
The amount of heat necessary to melt the field image 33 is provided by the heat source 30b.@Then, the heat source 30b melts the image 33, which is melted by direct contact with the warm decoy image Yuktomi a, which is fixed on the Sheila face.
Statue 1! 1IIK where offset phenomenon due to aK is likely to occur
ib9, a prevention liquid supply means 34 that supplies offset prevention liquid 113 to the heating roller 3G surface as a means to prevent this.
is the provision.

In the above, an elastic layer 5 oaa is provided on the surface of the heating roller 30 for preventing the offset phenomenon.
, silicone rubber (silicone RTV) containing an offset phenomenon prevention substance (silicone, etc.) in the rubber network structure.
It consists of Therefore, although the presence of the heating roller goFi elastic layer 30a is effective in preventing the above-mentioned off-four-shot phenomenon, it is important to note that the heated nitrogen roller is always heated during the 5oFi fixing, and that copying during fixing is prevented. Material! Because it comes into pressure contact with I3, it is an elastic layer! The anti-offset substance contained in OaK is gradually lost through consumption or evaporation. Therefore, when the anti-offset substance increases to less than a certain amount, the anti-offset effect disappears and the weight becomes heavy. Then, the anti-offset liquid 33 is supplied and coated in excess on the surface of the heating row 930 by the anti-offset liquid supplying means 34 .

The prevention liquid supply means 34 includes an endless supply member fi4a that supplies the offset prevention liquid 23 such as silicone oil stored in a container 1926 to the surface of the heating reeler 30, and this supply member 24a within the container 26. It is composed of rollers 24b and 2ac that extend across the surface of the heating reeler 30. In addition, supply parts! 4atj It is composed of an endless material such as impregnated felt, and its rotation direction is determined to be the forward direction that rotates along with the rotation of the heated P-220 surface as shown in the figure. For 10 surfaces, preventive liquid supply means 1
! 4, the offset prevention liquid supply amount (hereinafter referred to as supply prevention liquid) 33a applied to the surface of the heating roller 30 is set at a position where it can be suppressed before the copying material 32 is fixed, and the supply amount control unit vIIm@ is arranged. It is.

It is composed of a supply amount control means ash and an elastic control member i6a, and this control member zsah, for example, as shown in FIG. It is made so that it can be pressed against the row 220 surface.
In this case, the nip th can be selectively changed by the pressing mechanism s7. Supply amount control means! In this embodiment, the arrangement wax I6 is provided at a position where the heating roller 30 surface and the supply member 34a can come into contact with each other at a position where the smoke control member 36a suppresses the supply prevention liquid 33a. And ゛control member! Further, an elastic plate 38 is pressed against the lower surface of the plate 6a via a flat nut 29 of a leaf spring.Next, the operation of the supply amount control means s6 will be explained. The control member 1saH1 of the supply amount control means 36 is pressed against the surface of the heating reeler 20 in a non-rotating state with respect to the rotation of the heating roller 2G during fixing, forming a nip TT. Fixing roller A
1 The prevention liquid supply means 34 rotates to supply the offset prevention liquid 3s.
is applied to the heated p-930 surface, the heated reeler 3
The supply amount control means 36 pressed against the surface of the heating roller 30 suppresses the supply prevention liquid 33a on the surface of the heating roller 30 in accordance with the nip t.
Since it is pressed against the surface, the coating thickness a of the supply prevention liquid 23a supplied and coated on the heating roller 30 surface by the prevention liquid supply means 14 is reduced by the area thickness at the nip t of the control member 26-. , the amount of anti-offset liquid supplied for this coating thickness is the so-called appropriate amount, and IJ! The photographic material 33 is sent out for fixing.

On the other hand, the control member Z becomes excessive due to the suppression of the control member 26a.
The excess prevention liquid 28ba on Sa comes into contact with the supply member 14a on the way back and is absorbed by this.

Furthermore, the excess prevention liquid 33b remaining in the control member 36a
is squeezed by a plate 38, which is a counter-killer, and collected in a container 3s. In addition, the control member 36a is in a non-rotating state as described above, but if the control member 36a is not rotating like this, the contact surface forming the nip t will wear out quickly. Ia adt1M5 It is possible to rotate intermittently by the configuration shown in the figure.

In Fig. 5(a), the heating roller! A cam s8 is attached to the rotating shaft of the IO, and a swing lever 30 is attached via a one-way clutch 39 to the rotating shaft of the first generation control member 36a. Then, each time the heating w-ra 10 rotates once, the swing lever 30 is engaged with the cam 38, and the spring 31 returns the swing lever 30 to the stop position of the stopper s3. Through this, the control member depth 6a is rotated by a desired angle against the rotation direction of the heating roller 30. For this reason, the control member 3 and att are sequentially rotated by the above-mentioned intermittent interlocking, thereby preventing wear and tear at specific parts.

It should be noted that I! is fed into the fixing roller A and fixed. I
Copy material 33 is peeled off from the heating roller 30 surface by a peeling claw 33 disposed on the copy material discharge side and sent to the exit side. Further, numeral 34 shown in FIG. 3 is a blade for cleaning the heating roller sO surface.

Since the offset prevention liquid supply device of the present invention is as described above, the prevention liquid supply means 11 is applied to the heating row 920 surface.
The basket cloth thickness a of the supply prevention liquid s3a that is extra supplied and applied in step 4
However, the nip t of the supply amount control means 36 can extremely easily suppress the application to the desired coating 11b, and by making the control member *Sa of an angular rotation type, the durability of the blade can be greatly improved.

In addition, in the conventional example, the heating roller is supplied to the 30 surface.
l/A7't caused by too much anti-offset liquid.
) For example, if the anti-offset liquid is supplied too much, the elastic layer 30a on the heating roller surface will swell due to excessive diffusion and penetration of the supplied liquid, causing fixation spots. II after fixing due to a large amount of supply liquid adhering to photographic material s3! The conventional problems of photographic materials becoming unusable for copying and furthermore, the offset prevention liquid being consumed prematurely, are solved all at once.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the conventional offset prevention liquid supply means, Figure II3 is a side view showing the offset prevention liquid supply means of the invention in dj, and Figure 4 is an enlarged view of the main parts shown in Figure 3. , FIG. 5(a) d Front view of main part of control member rotation, 5th
v! JΦ) is an explanatory diagram of cam feeding in FIG. 5(a). A...Fixing reeler, 33...Offset prevention liquid, 33a...Supply prevention liquid, 3t...
. . . Prevention liquid supply means, SS . . . Supply amount control means, 36a . . . Control member. Patent applicant Rico Co., Ltd. - Agent Shunsuke Nakao Figure 1 Figure 5 (0) (b)

Claims (1)

[Scope of Claims] (1) In a fixing device for a machine including a pair of fixing rollers consisting of a heating roller and a pressure reeler, and an offset phenomenon prevention liquid being supplied to the above-mentioned fixing p-1. , a prevention liquid supply means for supplying offset prevention liquid to the fixing roller surface; and a supply amount control means that can further suppress the supply prevention liquid supplied by the prevention liquid supply means to the fixing roller surface. are arranged on the fixing roller,
A fixing p-ra offset prevention liquid supplying device, wherein the control member of the supply amount control means is a member that can be rotated by being pressed against the fixing roller surface. (Q) In an offset prevention liquid supply device configured by providing the fixing roller with a supply rate control means capable of suppressing the supply rate of the offset prevention liquid supplied to the fixing solar, a rotatable supply rate control unit that presses the fixing roller The fixing roller offset according to claim #!1, wherein at least one of the control member of the means and the fixing roller in contact with the control member is made of an elastic material. Prevention liquid supply device. (3) In the offset prevention +h* supplying device configured by providing the fusing roller with a buzzing supply control means for the offset prevention +h liquid, the supply amount control means pressed against the fixing roller is controlled. The fixing roller offset prevention liquid supply device according to claim 1, wherein the pressing force of the member can be selectively varied. (4) Offset prevention liquid supply device for the fixing roller. An offset prevention liquid supply device comprising a liquid supply amount control means, wherein a control member of the supply amount control means pressed by a fixing solar is opposed to the offset prevention liquid supply device in a roller rotation direction.