JPH01197782A - Image forming device - Google Patents

Abstract

PURPOSE:To immediately supply an alternate cleaning web by providing the plural cleaning web devices and making one of these selectively act to a fixing roller. CONSTITUTION:It is assumed that either a web cartridge K1 or K2, for example, the cleaning web of the cartridge K1 is pressed to the fixing roller 1. The cleaning web of a web roller on the feed-out side of the cartridge K1 is exhausted; then a sensor without the web, which has been outputting H so far, changes to output L. The sensor outputs L, then the starting signal of a motor M3 is outputted from the means which transfers the take-up driving to the web cartridge, the motor M3 is rotated to make a lever 6 half-rotate centering a pin 6a. A slide 1K1 carries the cartridge K1 and moves in the direction apart from the roller 1, then the cartridge K2 is pressed to the roller 1 by this. The automatic exchange of web is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an image forming apparatus, such as a copying apparatus, equipped with a fixing roller cleaning device.

"Prior Art" Conventionally, only one fixing roller cleaning web device was installed on the fixing roller.

In addition, the fixing roller cleaning web is similar to other consumables of the copying machine, such as toner, photoreceptors, charging wires, rubber rollers, and other members that deteriorate over time. The cleaning web has to be replaced immediately after it runs out, and it is impossible to predict when it will run out due to the number of copies.
In either case, maintenance costs are incurred because regular inspection and maintenance cannot solve the problem and end up replacing the remaining cleaning web that can be used, or inspection and maintenance is required after the replacement period has passed. This was the cause of the increase.

To avoid this, sensors have been installed to detect when the amount of cleaning web remaining is getting low, but this increases the number of times service personnel have to visit the user's site other than during regular inspections, and this is not effective in reducing maintenance costs. It had no effect.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide an image forming apparatus equipped with a fixing device that can immediately supply a replacement cleaning web even if the IJ-ring web suddenly runs out of use. That is.

[Structure of the invention]

"Means for Solving the Problems" The present invention provides a plurality of cleaning web devices for removing offset toner on a fixing roller, and means for selectively applying any one of the cleaning web devices to the fixing roller. This is an image forming apparatus equipped with Therefore, since the cleaning web is automatically replaced, by making sure that the total length of the cleaning web lasts longer than the regular inspection period of the image forming apparatus, the cleaning web only needs to be replaced during regular maintenance. You can use up the web exactly to the end, so there is no waste.
Copying costs can be reduced.

In addition, the display can be completely divided into the display to replenish the cleaning web when one or more cleaning webs have run out, and the display to show that there is no cleaning web when all the cleaning webs have run out. It is possible to avoid the situation where all you can do is wait and do nothing until it is completely gone.

"Example" Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view. The light carrying the image on the document table 22 exposed by the illumination light source 21 is
At the same time, it is reflected by a reflecting mirror 23 that reciprocates in the direction of the arrow A shown in the figure, and the direction is changed by a reflecting mirror 24 that moves in the same direction at a speed of - with respect to the illumination light source 21 and the reflecting mirror 23, and the image forming lens 25 The light is reflected by a fixed reflection mirror 26 toward a photoreceptor drum 27 that rotates in synchronization with the forward movement of the illumination light source 21 and reflection mirror 23, and is imaged on a photoreceptor on the outer periphery of the photoreceptor drum 27.

Around the photoreceptor drum 27, various apparatuses for performing known electrophotographic processes such as uniform charging, image exposure, development, transfer, and cleaning are arranged, and paper is fed in synchronization with the photoreceptor drum 27. The image formed on the photoreceptor drum 27 is transferred to the transfer material sent from the transfer section 28 in the transfer section 29, and the image is sent between the fixing roller 1 and the pressure roller 2 to be fixed. is discharged. A small amount of the toner on the transfer material is transferred to the fixing roller 1 by fixing, and paper powder, etc., is resistant to adhering to the fixing roller 1, but the cleaning roller 1 is pressed against the fixing roller 1 by the web pressure roller 3. web 1
Transferred toner, paper powder, etc. are removed by step 1.

The cleaning web device for the fixing roller 1 is attached to a web cartridge having the same configuration as 1. It is equipped with 2.

1 for each web cartridge. 2 has a delivery-side web roller 4, a web pressure roller 6, and a web take-up roller 5, which are each pivotally connected to a case 31, and the cleaning web 11 wound around the delivery-side web roller 4 is subjected to web pressure. The web is wound around a roller 3 and wound around a web take-up roller 5. A web sensor s1. detects that the cleaning web 11 is no longer at the position of the cleaning web 11 stretched between the delivery side web roller 4 and the web pressure roller 3. s2 is provided.

FIG. 2 is a front view of a device for selectively pressing the web cartridge Kl, 2 against the fixing roller 1. pin 6IL
Therefore, both ends of the lever 6, whose center is pivotally connected to the immovable part, are connected to each web cartridge Kl.

It is in contact with the rear end of case S1 of K2. The other end of the tension coil spring 7, which is locked to one end of the lever 6, is locked to a stationary part. An eccentric cam 8 is in contact with the side of the arm portion of the lever 6 on which the spring 7 is locked and is displaced by the spring 7, and the camshaft 8a is connected to a motor Mδ.

In each web cartridge, the case S1 of K2 is provided with a slide IK1. It is detachably attached to I Kz. Slide I K1. IK2 are each biased towards the ends of the lever 6 by means of a spring device 32. As described above, the cleaning webs 11 provided at each angle of 1°K2 in the web cartridge selectively come into contact with the fixing roller 1.

As shown in FIG. 3, each web cartridge Kl.

Is the shaft 5a of the web take-up roller 5 of K2 a shaft coupling? .

1G causes motor M1. Connected to M2.

Motor M1. Ml is fixed at slide 1IC+, IKt.

FIG. 4 shows a drive circuit for motors M1 and M2. The drive circuit has an output terminal of the webless sensor S1, an input terminal π of the flip-flop 12, and an antagonal gate)17. The output terminal of the webless sensor 82 is wired to one input terminal of each of the AND gates 18, the output terminal of the webless sensor 82 is wired to the input terminal 10 of the flip-flop 12, and one input terminal of the AND gate 171 is wired to the remaining one input terminal of the AND gate 18. The positive phase output terminal Q of the flip-flop 12 is wired to the remaining input terminal of the AND gate 17, and the complementary output terminals are connected to the remaining output terminal of the AND gate 171 and the input terminal of the one-shot multivibrator 15. Combined, Antogame)
17. 17' output terminals are respectively connected to anime) 19.19
19 and the remaining input terminal of each of the AND gates 19 and 19' are connected to the transmission line of the web winding signal Sw, and each of the AND gates 19 and 19' The output terminals are connected to the motor M1. through a power amplifier circuit (not shown). M2, and the output terminal of the AND gate 18 is connected to a lamp LW indicating that one of the cleaning webs 11 has run out;
The output terminal of the OR gate 20 is wired to a no-web lamp LWO indicating that all the cleaning webs 11 are gone and is coupled to one input terminal of the AND gate 15, and the output terminal of the one-shot multivibrator 13 is connected to the AND gate 15. The output terminal of the AND gate 15 is connected to the motor M3 via a power amplifier circuit (not shown).

Next, the effect will be explained.

The web sensor S1.82 outputs H when there is cleaning web 11, and outputs L when there is no cleaning web 11. As shown in FIG. 2, the cleaning web 11 of the web cartridge 1 is attached to the web cartridge 1, K2, or K2, for example, when the cam 8 pulls the lever 6 around the pin 6a and resists the coil spring 7. Assume that the fixing roller 1 is pressed against the fixing roller 1 while being rotated 180 degrees from the solid line position in FIG. 2 to the dotted line position.

In the set state, the output terminal Q of the flip-flop 12 is outputting H, and the AND gate 17 is inputting the H signal of the output terminal Q. ■Adds input.

Therefore, when a web winding signal sy is sent in connection with the copying operation, the AND gate 19 outputs H, rotates the motor M1 via a power amplification circuit (not shown), and winds one web into the web cartridge. Rotate roller 5. The cleaning web 11 is taken out from the delivery side web roller 4 by the web winding signal SW sent every time a copying operation is performed, and is pressed against the surface of the fixing roller 1 by the pressure roller 3 to remove dirt from the fixing roller 1. The process of winding the web onto the web winding roller 5 is repeated.

When the web cartridge runs out of the cleaning web 11 of the delivery side web roller 4 and its end passes past the web no sensor S1, the no web sensor S
1, which had been outputting H until now, changes to L. Therefore,
The AND gate 18, which receives H signals from both web-free sensors s, , s2, and outputs the signal 2, outputs an L web addition signal SVt. In response to this signal change,
A lamp LWI indicating web addition is lit via a lighting circuit (not shown). Web cartridge x1. x2 is selectively used, and when the web absence sensor S2 detects the absence of the cleaning web 11, it operates in the same way and the lamp IJYI lights up.

As mentioned above, when the webless sensor S1 outputs L, the input to the input terminal 100 of the flip-flop 12 changes from H to B, and the output of the output terminal Q, which had been outputting ■, becomes L.
The output of the complementary terminals changes from L to ■. The AND gate 17 receives the signal L from the web sensor S1, the output signal from the flip-flop 12, and the output signal M1 becomes L; the AND gate 171 receives the signal H from the web sensor S2 and the complementary signal from the flip-flop 12 When the output signal H is added, the output signal M2 becomes H. On the other hand, the one-shot multivibrator 13 detects the change in the output of the complementary output terminal of the flip-flop 12 and outputs a pulse signal 14 of a constant width, as shown in FIG. issue. In this case, the output of the complementary output terminal of the flip-flop 12 has changed from L to H, so the pulse of the one-shot multivibrator 13 is inputted to the AND gate 171 by the output signal M21 of the AND gate 171 via the OR gate 20. 15, a start signal SMM for the motor M3 is generated, and the motor M5 rotates and transmits it to the cam 8 via a power amplification circuit (not shown). The cam 8 causes the lever 6 to rotate half a turn about the pin 6a against the tension coil spring 7 in FIG. As a result, the slide 1 carries 1 on the web cartridge by the spring device 32 and moves in the direction away from the fixing roller 1, and the web cartridge 2 is newly pressed against the fixing roller 1. This completes the automatic web exchange. The actual driving of M, , M2 is controlled by a web winding signal from the main body of the copying apparatus.

Next, a case where both webs 11 are lost will be explained. In this case, both web sensors sl and s2 output L, so the output signal M1' of 17.17 is
Since M2' is on both sides and AND gates 19 and 19' are also on output, motors M, , and M2 do not rotate. The webless signal Swo becomes L. Also start signal SMS
The signal is also cut by the AND gate 15 and is not output. Note that at this time, the output 12 of the flip-flop 12 is undefined.

"Other Embodiments" FIG. 6 shows other embodiments. 6 to web cartridge
, axis 33. is placed in the center. In this case, for example, when the web of & in the web cartridge is finished, the shaft 6
Rotate around 3 and move 4 to the next web cartridge.
1 to the position l in Figure 6. For web winding, a motor (not shown) engages only the web cartridge located at position δ1 in FIG.

〔Effect of the invention〕

As explained above, when multiple fixing roller cleaning webs are installed, by automatically replacing them, cleaning webs can be replaced only during periodic maintenance without leaving anything unused.
Copy cost is reduced. Furthermore, if the cleaning webs are made into a unit and one of them runs out, a web addition signal is issued and displayed on the operation section of the image forming apparatus, thereby prompting the cleaning web to be replaced. At this time, it is sufficient to replace the cleaning web before the other cleaning webs are used up, so the replacement timing is not instantaneous as in the past, but allows a considerable amount of time. Furthermore, there is no need to prohibit the operation of the image forming apparatus. You can prohibit it only after all the cleaning webs are gone.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an embodiment of the present invention, FIG. 2 is a front view showing means for bringing the web cartridge into contact with the fixing roller, and FIG. 3 is a front view showing means for transmitting winding drive to the web cartridge. FIG. 4 is a perspective view, FIG. 4 is a web cartridge switching drive circuit diagram, FIG. 5 is a timing chart showing an M3 start signal, and FIG. 6 is a front view showing another embodiment. 1...Fixing roller 3...Web pressure roller 4...Feeding side web roller 5...Web winding roller after use sl, δ2...Web sensor Ml, M2...Web winding motor.

Claims (1)

[Claims] 1. An image forming apparatus comprising a plurality of cleaning web devices for removing offset toner on a fixing roller, and means for selectively applying any one of the cleaning web devices to the fixing roller.