JPS60108871A - Fixing device - Google Patents

Abstract

PURPOSE:To remove dirt accumulated between an offset preventing device and a rotating roll by making it possible to lead out the offset preventing device in the third position to the other end side in the lengthwise direction and sliding a dirt removing member on the rotating roll when the offset preventing device is led out. CONSTITUTION:A device is so constituted that only an offset preventing device 27 can be led out forward in the axial direction of a heating roll 20. A scraping blade 32 which removes dirt accumulated between the offset preventing device 27 and the heating roll 20 and consists of silicone rubber having about 1mm. thickness is provided in the depth-side end part in the axial direction of the offset preventing device 27. In case that the offset preventing device 27 is set to a fixing device 30, the offset preventing device 27 and the scraping blade 32 are pressed in the direction of an arrow in the position where they are not brought into contact with the surface of the heating roll 20. Thus, the offset preventing device 27 is pressed to the surface of the heating roll 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a removable offset prevention device that applies offset prevention liquid to a rotating fixing roller. The present invention relates to a fixing device that can remove dirt accumulated between an offset prevention device and a rotating fixing roller.

(b) Prior Art In electrostatic recording devices, such as those typically used in photocopiers and facsimile machines, the original or electrical information is recorded based on the reflected light obtained by scanning the original with fog light or the Vi light information signal. An electrostatic latent image is formed on a photoreceptor or dielectric material, the electrostatic latent image is developed to become a visible image, and this visible image is transferred to recording paper and then fixed to form a recorded image. There is. 1st F;! J is ML
This figure shows a schematic configuration of a secondary photocopying machine, in which a document G placed on a document table 1 that reciprocates in the direction of the arrow is irradiated with an illumination lamp 2, and the light reflected from the document G is reflected by a rotating drum that rotates in the direction of the arrow. The document G is projected onto the photoconductor 3a of No. 3 and
forms an electrostatic latent image. A charging electrode 4 for uniformly charging the photoreceptor 3a, a developing device 5, a transfer electrode 6, a separation electrode 7, a turtle removal electrode 8, and a cleaning device 9 are sequentially arranged around the rotating drum 30. ing.

The static latent image is developed into a visible image by a developing device 5,
The l'J visual image is transferred from a paper feed device such as a cassette @10 to a conveyance device [
The image is transferred by the transfer electrode 6 onto the recording paper P fed by the transfer electrode 6 . After transfer, the recording paper P is attached to the photoreceptor 3a by the separation electrode 7.
The paper is separated from the paper and transported to the fixing device 13 by the transport device [12, where it is fixed and discharged onto the paper discharge tray 14.

The fixing devices used in electrophotographic copying machines include a non-contact fixing method that heats and fixes toner using radiant energy such as infrared rays, and a non-contact fixing method that heats and fixes toner using radiant energy such as infrared rays, and a non-contact fixing method that uses conductive heat from a heating member that contacts a recording medium that carries unfixed toner. There is a contact fixing method that heats the toner and fixes it. A fixing device using the latter method consists of a heating roller that has a built-in heater and is driven by a drive source, and a pressure roller that rotates in pressure contact with the heating roller, and the toner image is recorded by the heat from the heating roller. A heat roller type fixing device that heats and fuses the paper to the paper is generally known, and this method is widely used because it has advantages such as high thermal efficiency, low power consumption, and high-speed fixing. There is.

In this type of heat roller type fixing device, the toner on the recording paper adheres to the heating roller, causing a so-called offset phenomenon, which stains the recording paper, and the recording paper tends to wrap around the heating roller due to the adhesion of the offset toner. There was one haiku topic.

Therefore, in order to solve this problem, a method has long been proposed in which an anti-offset liquid such as silicone oil is applied to the heating roller that comes into direct contact with the surface of the recording paper that bears the toner image (Japanese Patent Publication No. 41-21430). . As a method of applying the anti-offset liquid to the heating roller, for example, as shown in FIG.
0, the silicone oil 23 in the oil tank 22 is supplied via an oil-impregnated member 21 such as felt, or the silicone oil is supplied from the oil tank through the oil-impregnated member by bringing an oil application roller into contact with a heating roller. There is a type that supplies (JP-A-54-37T52).

However, providing the fixing device with a mail tank, an oil-containing member for applying oil, a roller, etc. increases the size of the entire device, which is contrary to the recent trend toward miniaturization of devices. Further, since these oil tanks and oil application members are usually fixed to the fixing device with screws or the like, it takes time and effort to remove them when replacing them, which is not preferable in terms of handling.

Therefore, in order to solve this problem, as shown in Figure 3,
Contains an anti-offset liquid that is made from felt impregnated with a certain amount of anti-offset liquid such as silicone oil! bukai 24
and a cleaning member 25 made of felt that temporarily cleans the surface of the heating roller 20 before the offset prevention liquid is applied to the surface of the heating roller 20 by the offset prevention liquid impregnated member 24 and are held together by a holding member 26. The offset prevention device 27 is constructed by making the guide plate 26a on the holding member 26 slidable in the axial direction (arrow direction) of the heating roller 20 within the rail 28 above the heating roller 20. No. 27 has been proposed in which the entire fixing device is removable. In this case, in order to replace the offset prevention liquid-impregnated cartridge 24 and the cleaning member 25, first remove the entire fixing device 30 from the copying machine main body 29 as shown in FIG. There is a method of replacing the offset prevention device 27 by pulling it out in the axial direction with the offset prevention device 27 opened.

In addition, as shown in FIG. 4(B), the copying machine main body 29 has a two-part structure that can be divided into upper and lower parts, and when the top cover 30a of the fixing device 3o is opened in the divided state (indicated by solid lines), the offset prevention device 29 is opened. There is a way to pull it out and replace it. In addition, in a fixing device in which a cleaning device is attached to the heating roller surface in order to clean the dirt caused by toner and paper powder adhering to the surface of the heating roller,
There is a method of moving the cleaning device upward to release the pressure between the cleaning device and the heating roller, and then pulling the cleaning device forward and replacing it.
No. 661).

By the way, it is quite time-consuming to take out the entire fixing device 30' from the main body of the copying machine or to divide the main body of the copying machine into two parts. Furthermore, since the heating roller 20 is heated to a high temperature of about 160° to 200°C by an internal heater when fixing the toner image, the upper lid 30a of the fixing device 30 is closed when the temperature of the heating roller 20 has not yet fallen sufficiently. There is a risk of getting burned when opening the A7 set prevention device 27 and replacing it. On the other hand, offset prevention device i27
Even if a side wall is not provided on the front side in the axial direction so that the upper lid 30 of the fixing device 30 can be pulled out to the front side in the F-axis direction,
If the offset prevention device 1127 is removed or installed without opening a, the offset prevention liquid impregnated member 24
Since each surface of the cleaning member 25 rubs against the surface of the heating roller 2°, the surface of the heating roller 20 may be damaged. In addition, toner, paper dust from transfer paper, or carrier particles in the developer may mix with the anti-offset liquid.
When the surface of the cleaning member 25 becomes dirty, the offset prevention liquid impregnated member 24 and the cleaning part 47 become dirty over a long period of time.
Dirt may accumulate between 2s and the heating roller 20, and the dirt may be transferred onto the heating roller 2o. As a result, there is a problem in that the transfer paper becomes dirty even as it passes between the heating roller 20 and the pressure roller 31.

(c) Object and structure of the invention The present invention has been developed in view of the above points, and includes a pair of rotating fixing rollers that rotate in pressure contact with each other, and a fixing roller that has a length of at least 10,000 km and 17 sets of the rotating rollers. In a fixing device having an attachment/detachment opening for applying an anti-offset liquid and a capable offset prevention device, the purpose is to remove dirt accumulated between the offset prevention device and the rotating sound roller, and for this purpose, the offset prevention device is A dirt removing member is provided at one end in the longitudinal direction of the roller, and when mounted on the offset prevention device, takes a first position where it is separated from the rotating roller together with the dirt removing member 6, and a second position where it is in pressure contact with the surface +D of the rotating roller during mounting. The offset prevention device can be pulled out to the other end in the longitudinal direction at the third position, and the offset prevention device can be pulled out to the other end side in the longitudinal direction at the third position. When the roller is pulled out, the dirt removing section slides on the rotating roller to remove dirt on the surface of the rotating roller.

) 1 blood case Hereinafter, the present invention will be explained based on the drawings.

The 51st prongs (a), (mouth), and (c) respectively show an *r-+rti view and a side view of the fixing device according to the present invention. Instead of opening the top cover and removing the offset prevention device 2, only the offset prevention device 27 can be pulled out in front of the heating roller 20 in the axial direction.

Also, is there dirt accumulated between the offset prevention device 27 and the heating roller 20 on the axially far side end (right side in the figure) of the offset prevention device 27? Thickness to remove? A scraping blade 32 made of about 100 ml of silicone rubber is provided. To attach the offset prevention bag 27 to the fixing bag 30, as shown in FIG.
Push in the direction of the arrow without touching the surface. When the offset prevention device 27 is pushed into the predetermined position of the fixing device 30 in this manner, the offset prevention device 27 is pressed against the surface of the heating roller 20 as shown in FIG. 5(b).

Next, when removing the offset prevention device t27 from the fixing device 1i30, raise it to a position where only the tip of the scraping blade 32 contacts the surface of the heating roller 20, as shown in FIG. Pull it out.

Next, the attachment/detachment mechanism and the attachment/detachment method of the offset prevention device will be explained.

FIG. 6(A) is a schematic side view of the offset prevention device according to the present invention, and FIG. 6(B) shows the offset prevention device 270 shown in FIG. The state is shown when viewed from the back side in the axial direction. In each figure, the offset prevention device 27 shown in FIG.
It is integrally held by a holding member 40, and a scraping blade 32 is attached to the rear end of the holding member 40 in the f&manual force direction (right side in FIG. 6(a)). A V is formed on the left and right side walls of the rear end of the holding member 40.
A offset prevention device 27 slides in the longitudinal direction by engaging the guide pin 41.41 with a guide groove 42.42 extending in the longitudinal direction of the fixing device Fi, which will be described later. It has become a Noh performance.

Further, on the longitudinal direction front side of the holding member 40 (the left side in FIG. 6(A)), a locking claw 4 for fixing the offset prevention device is provided.
3 is provided, and a handle 44 for removing the offset prevention device iij is provided at the front end.

FIG. 7 is a schematic side view of one side of the main part of the attachment/detachment mechanism of the fixing device according to the present invention, in which a guide groove 42 extending in the longitudinal direction is provided in the fixing device. a groove 42a that engages with the guide pin 41, a groove 42b that engages with the guide pin 41 during installation, a groove 42c that engages with the guide pin 41 during removal, and a groove 42 that connects the groove 42a and groove 42b.
2d and a groove 42e connecting grooves 42b and 142c. Near the back side in the longitudinal direction of the guide groove 42 (on the right side in FIG. 7), an offset prevention device pressing spring 45 is provided fixed to the back wall of the fixing device. On the other hand, on the front side in the longitudinal direction of the guide groove 42 (on the left side in FIG. 7), a guide bin guide lever 47 for guiding the guide pin 41 to the guide groove 42a when installing the offset prevention device 27 is attached to point A. It is provided so that it can be rotated around the center G.

One end of the guide lever 47 is biased counterclockwise by a bar 48 attached to the wall of the fixing device, and the other end is rotated by a stopper 49. On the front side of the fixing device, a locking claw 43 of the offset prevention device 27 and a claw 50a capable of engaging the offset prevention device 27 are provided at one end.
0 is installed so that it can perform IM movement around point B.

This L-shaped lever 50 is attached to the wall of the fixing device and biased clockwise by a spring 51.
An r-town handle 50b is provided at 7M.

Considering the case where a used offset prevention device is replaced with a new offset prevention device using such an attachment/detachment mechanism, in order to remove the used offset prevention device M27 from the fixing device k, the handle of the L-shaped lever 50 is 50b downward against the spring 51, and then push the locking claw 43 of the offset prevention device 27 and the claw 5 of the L-shaped lever 50.
The relationship with 0a cancels the state. Therefore, the guide pin 41
When the entire set prevention device 27, which is in the state where it is engaged with the guide groove 42b, that is, the position corresponding to FIG.
e and engages with the guide groove 42c. As a result, A
The offset prevention device 27 is located at position 1a corresponding to FIG. 5(c).
Take. When the offset prevention device 27 is pulled further forward, the guide pin 41 hits the guide lever 47, but the guide lever 47 rotates clockwise around point A against the spring 48 and opens the guide groove through which the guide pin 41 passes. 42c, the entire offset prevention device 27 can be removed from the fixing device without any problem. In this way, when the entire offset prevention device 27 is pulled out near the back side in the longitudinal direction, the scraping blade 32 rubs the surface of the heating roller 20, so that the scraping blade 32 rubs the surface of the heating roller 20. dirt is removed.

Next, to install a new offset prevention device,
When the handle 50b of the L-shaped lever 50 is pressed downward against the spring 51 and the offset prevention device rt27 is pushed in so that the guide bin 41 contacts the guide lever 47 above the guide groove 42, the guide lever 47 The guide bin 41 rotates clockwise against the spring 48, and the guide lever 4
When it leaves the end of 7, it is automatically guided and engaged in the guide groove 42a. As a result, the offset prevention device-27
Take the position corresponding to figure (a). On the other hand, the guide bin 41
When the guide lever 47 leaves the end of the guide lever 47, the guide lever 47
is biased in the counterclockwise direction by the spring 48 and the stopper 4
9 will be regulated again. When the offset prevention device 27 is pushed deep into the guide (7442a), the guide bin 41 is pushed down by the suppression spring 45, enters the groove 42d, and engages with the guide groove 42b.

So, I turned the handle 5 of the L-shaped lever 5 degrees that I had been pushing until then.
0bfi: When released, the lever 50 is moved by the spring 5 to the time 3.
Offset prevention device lt2?7 because it rotates in one direction
Q) The locking claw 43 and the claw 50a of the L-shaped lever 5o engage, and the offset prevention device 1f27 is held at the position corresponding to FIG. The member 24 and the cleaning member 25 are positioned in pressure contact with the surface of the heating roller 200.

In this example, silicone rubber 2 is used for the scraping blade.
However, the scraping blade of the present invention is not limited to this, and any member such as a sponge that does not damage the roller surface may be used. 1. In this embodiment, a fixing device provided with an offset prevention device having a cleaning member has been described, but the present invention can also be applied to a fixing device provided with only a cleaning member.

(E) Detailed Description of the Invention As described above, the present invention includes a pair of rotating fixing rollers that rotate in pressure contact with each other, and a detachable offset prevention device that applies offset prevention liquid to at least one of the rotating rollers. 2, a dirt removing member is provided at one longitudinal end of the offset preventing device, and when the offset preventing device a is installed, the offset preventing device a assumes a first position where it is separated from the rotating roller together with the dirt removing member; It takes a second position where it comes into pressure contact with the surface of the rotating roller, and when it is removed, it takes a third position where only the dirt removing member comes into contact with the surface of the rotating roller, and the offset prevention device can be pulled out to the other end in the longitudinal direction in the third position. When the offset prevention device is pulled out, the dirt removal member slides on the rotating roller to remove dirt on the surface of the rotating roller, so the transfer paper will not get dirty even after long-term use. . Furthermore, since the offset prevention device can be removed simply by operating the handle of the lever that can be operated from the outside, the offset prevention device can be easily replaced. Furthermore, since the rotating roller is hardly exposed when the offset prevention device is replaced, the offset prevention device can be replaced safely. Furthermore, since the offset preventing device does not rub against the surface of the rotating roller when the offset preventing device is replaced, the surface of the rotating roller is not easily damaged.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a tit electrophotographic copying machine, FIGS. 2 and 3 are schematic diagrams of a conventional hole fixing device, respectively.
Figure 4 (a) shows the fIi! fixing device shown in Figure 3! The decoy shown in the state taken out from the camera body, Figure 4 (b) is 2
FIG. 5(A) is a diagram showing a state in which the main body of a copying machine with a split structure is divided into two parts, and FIG. ) is a front view and a side view of the fixing device according to the present invention shown with the offset prevention device installed, and FIG. 5(C) is a front view and side view of the fixing device according to the present invention shown with the offset prevention device removed. FIG.
B) is an end view of the offset prevention device shown in FIG. 7A, and FIG. 7 is a schematic side view of one side of the main part of the attachment/detachment mechanism of the fixing device according to the present invention. 13.30...Fixing device, 20...Heating roller%
2J...Oil-containing fII5 Hayashi, 22...Oil tank,
23...Silicone oil, 24...Offset prevention liquid impregnated B material, 25...Cleaning member, 27...
・Offset prevention device, 28...Rail, 31...
Pressure roller, 3-... scraping blade, 40...
Holding member, 41... Guide bin, 42... Guide groove, 43... Locking claw, 44.50b... Handle, 45...
...Offset prevention device pressure spring, 47...Guide bin guide lever, 48.51...Spring, 49...Stopper, 50...L-shaped lever special η'1・Applicant Konishiroku Photo Industry Agent Co., Ltd. Patent Attorney Hiroo Suzuki

Claims (1)

[Scope of Claims] (1) A fixing device comprising a pair of fixing rotary rollers that rotate in pressure contact with each other, and a detachable offset prevention device that distributes an offset prevention liquid to at least one of the rotary rollers, A dirt removal member is provided at one longitudinal end of the offset prevention device, and when installed, the offset prevention device takes a full first position away from the rotating roller together with the dirt removal member, and during installation, the dirt removal member is attached to the surface of the rotation roller. At the time of removal, only the dirt removing member is in the third position where it is in contact with the surface of the rolling roller, and the offset prevention device (9) is placed in the third position in the longitudinal direction. It can be pulled out to the other end,
A fixing device characterized in that when the offset prevention device is pulled out, the dirt removing member rubs against the rotating roller to remove any dirt on the surface of the rotating roller. (2) The fixing device according to claim 1, wherein the offset prevention device includes a cleaning member on the upstream side when viewed in the rotational direction of the rotating roller.