JPS6026972A - Roller fixing device - Google Patents

Abstract

PURPOSE:To prevent stains from remaining and sticking to a fixing roller and affecting adversely the fixing in the stage of exchanging a cleaning member by constituting a fixing device in such a way that the surface of the fixing roller is rubbed in parallel with the shaft by a scraping blade in the stage of attaching and detaching a holding frame which holds a member for applying an offset- preventive liquid and has the scraping blade at one end to and from an attaching rail. CONSTITUTION:A holding frame 10 not only holds a member 9 for applying oil but also holds a cleaning member 13 which cleans the surface of a roller 2 before the member 9 applies the oil to the roller 2. Said frame has further a scraping blade 14 at one end. The blade 14 scrapes away the stains and oil remaining and sticking to the surface of the roller 2 from the member 13 and the member 9 by contacting slidingly with the surface of the roller 2 in the axial direction thereof in the stage of attaching and detaching the holding frame 10 to and from the attaching rail 12 and consists preferably of a material having excellent elasticity and heat resistance such as silicone rubber, fluororubber, tetrafluororesin, perfluoroalkoxyethylene resin, etc.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an improvement of a roller fixing device used for fixing a toner image to a recording sheet in a recording device such as an electrophotographic copying machine. A support such as a recording paper attached to the surface is passed between a pair of pressure rollers to which an anti-offset liquid is applied to the roller on the side to which the toner image is attached, and the toner image is supported by applying pressure or further heating. The present invention relates to an improvement of a roller fixing device for fixing to a body.

[Prior art]

In general, in the roller fixing device described above, at least one of the pair of pressure rollers, often the side on which the toner image is attached, is used in order to make the device lighter and more compact, as well as to stabilize fixing and increase speed. The roller is heated by a heat source installed inside or outside the roller. That is, the most popular type is one in which the toner image is fixed by heating and pressure. In addition, toner tends to be easily offset from the support, especially on the side of the roller where the toner image is attached.
Further, since the offset toner tends to wrap around the support, an anti-offset liquid (hereinafter referred to as oil) such as silicone oil is applied to the surface. However, if too much oil is applied, the support becomes contaminated with oil, which makes it difficult to write on the support later with pencil or ink, and the amount of oil consumed increases, making it uneconomical. It was. Therefore, many means have been employed in the past to uniformly and thinly apply oil to the surface of the roller. As such an oil application means,
The devices shown in FIGS. 1 to 4 are known.

In FIGS. 1 to 4, reference numerals 1 and 2 are a pair of fixing rollers rotating in the direction of the arrow and in pressure contact with each other, of which roller 2
is a roller that is provided with a heat source 3 such as a halogen tube heater or a resistance heating element inside, and that presses the toner image-attached side of the support. 4 is an oil tank, 5 is an oil transfer section, 6 is an oil applicator for applying oil to the surface of the roller 2, and 7 and 8 are scraping units for removing excess oil and dirt adhering to the roller 2. The member and wiping member 9 is an oil applying member such as felt or sponge impregnated with oil.

Compared to the oil applying means shown in FIG. 4, the oil applying means shown in FIGS. 1 to 3 has the advantage that oil can be applied to the roller 2 indefinitely as long as the oil tank 1 is replenished with oil. However, this has the problem of making the device complicated and large, and in practice, dirt such as toner and paper dust adheres to the oil application section 6, causing clogging, which makes it difficult to compare. Since the oil is not applied uniformly in a short period of time, the above advantages are rarely achieved. In this respect, the oil applying means shown in FIG. 4 is designed so that the oil applying member 9 can be fixed to the holding frame 10 by rollers so that it can be easily replaced on the premise that the oil applying member 9 runs out of oil and becomes dirty. The mounting provided on the device frame upper lid 11 of the device is configured so that it can be attached by inserting it into the rail 12 from the side, so the device is simple and compact, and the oil applying member 9 can be attached to the holding frame 10 as needed. By exchanging them, there is an advantage that uniform oil application can be achieved at all times. However, even in the oil applying means shown in Fig. 4, even though the oil applying member 9 is still sufficiently impregnated with oil (5), it is necessary to replace it due to contamination. There are problems in that the dirt accumulated on the roller 9 remains on the surface of the roller 2 together with the oil during replacement, contaminating the support, and the oil application member 9 becomes dirty early after replacement. There is also the problem that the oil application member 9 cannot be easily reused.

[Purpose of the invention]

The present invention has been made in order to solve the problems in the conventional oil applying means as described above.The first object of the present invention is to provide a simple and compact device.
It is an object of the present invention to provide a roller fixing device which solves the problem of replacing the oil applying member of the oil applying means as shown in the figure. To provide a roller fixing device capable of uniformly applying oil until almost no oil is retained.

[Structure of the invention]

In the present invention, a support with a toner image attached to its surface is (6) passed between a pair of pressure rollers to which an anti-offset liquid is applied to the roller on the side to which the toner image is attached, and then pressurized or further heated. In the apparatus for fixing the toner image on the support by means of the above, the offset prevention liquid application member is held in a holding frame having a scraping blade at one end, and the holding frame is fitted onto a rail for fixing the fixing device frame to prevent offset. The anti-offset liquid is applied to the roller by a liquid applying member, and the holding frame is attached so that the surface of the roller is rubbed parallel to the axis by the scraping blade when being attached to and detached from the rail. A roller fixing device is characterized in that the first object is achieved by this structure, and furthermore, a cleaning member for cleaning the roller before applying oil to the roller is also held in the holding frame. In a specific embodiment of the present invention, the second object is also achieved.

〔Example〕

The present invention will be explained below based on the embodiments shown in FIGS. 5 to 13.

FIG. 5 is a perspective view of essential parts showing an example of the roller fixing device of the present invention, FIG. 6 is a partial front view, FIG. 7 is a partial side view as seen from the scraping blade side, and FIGS. 8 to 10 are FIGS. 11 and 12 are side views of main parts showing other examples of the roller fixing device of the present invention, and FIG. 13 is a partial front view showing an example of the shape of the scraping tip of the scraping blade. It is a sectional view showing other examples.

In these figures, the same reference numerals as in FIGS. 1 to 4 indicate the same functional members, but the holding frame 10 not only holds the oil applying member 9 but also allows the oil applying member 9 to apply oil to the roller 2. The holding frame 10 is different from the holding frame 10 shown in FIG. 4 in that it also holds a cleaning member 13 for cleaning the surface of the roller 2 before applying it, and further has a scraping blade 14 at one end.

The scraping blade 14 is attached to the holding frame 10 on the rail 1.
2, the surface of the roller 2 is rubbed in the axial direction to scrape off dirt and oil remaining on the surface of the roller 2 from the cleaning member 13 and the oil application member 9. Yes, silicone rubber, fluorine rubber, tetrafluoride m fat, perfluoroalkoxyethylene It
Preferably, the material is made of a material that has excellent elasticity K and heat resistance.

At the scraping tip of the scraping blade 14,
To ensure effective scraping, please refer to Figures 7 to 10.
Any suitable shape as shown in the figure may be used.

The cleaning member 13 shown in FIG. 5, FIG. 7, and FIG.
The one shown in the figure is a roller-shaped roller having a cleaning gear made of a 7+3B elt, sponge, etc. on the outer periphery of a roller core 13a that is pivotally supported on the end face of a holding frame 10. Cleaning layer 1 of rod-shaped cleaning member 13 or roller-shaped cleaning member 13
3b is particularly made of felt made of aromatic polyamide fibers (
For example, Nomex felt (manufactured by DuPont) is preferably used from the viewpoint of heat resistance, wipeability, durability, etc., and it is preferable to use it after being impregnated with an appropriate amount of oil in order to further improve the wipeability. Leaning member 1 like this
3 is provided on the holding frame 10 so that the surface of the roller 2 is cleaned before the oil application member 9 applies oil, so that the oil application function of the oil application member 9 is not impaired by dirt. Furthermore, the accumulation of dirt on the cleaning member 13 does not impair the cleaning function to the extent that the accumulation of dirt on the oil application section 6 and the oil application member 9 of the oil application means impairs the oil application function.
It is possible to uniformly apply oil to the roller 2 until the oil held by the oil applying member 9 is almost exhausted, and the effect that the replacement period of the holding frame 10 is extended is obtained. However, the present invention is not limited to the example in which the cleaning member 13 is provided on the holding frame 10.

The oil applying member 9 shown in FIGS. 5 to 7 and 11 is rod-shaped like the one in FIG.
The one shown in FIG. 12 is a roller-shaped cleaning member 1.
Similar to 3, it is roller-shaped. That is, the oil applying member 9 shown in FIG. 12 has an oil-impregnated layer 9b made of oil-impregnated felt, sponge, etc. on the outer periphery of a roller core 9a that is pivotally supported on the end face of the holding frame 10. Instead of this roller-shaped oil application member 9, one as shown in FIG. 13 may also be used. Oil applying member 9 in Fig. 13
In place of the roller core 9a of the oil application member 90 shown in FIG. 12, a drum-shaped member is provided with an oil supply port on the end face, can store oil inside, and has an oil seepage hole in the peripheral wall. The roller core 9a' is used, and 9b is an oil-impregnated layer as in FIG. 12. Note that if an oil exudation layer having a higher oil passage resistance than the internal oil-impregnated member is further provided on the surface of the rod-shaped or roller-shaped oil applying member 90 that contacts the roller 2, the internal oil impregnation will be prevented. Even if the member is impregnated with a large amount of oil, or even if the contact pressure of the oil applying member 9 against the roller 2 is increased, the effect of applying oil to the roller 2 more stably and uniformly in a thin layer can be obtained. It will be done. However, it goes without saying that the present invention is not limited thereto.

〔Effect of the invention〕

In the roller fixing device of the present invention as described above,
The structure is simple and compact, and when replacing the oil application member and cleaning member, dirt is prevented from remaining on the fixing roller and causing damage, and the oil application member is almost free of oil. Excellent effects such as being able to uniformly apply oil to the fixing roller until the fixing roller is completely fixed can be obtained. Further, in the case where the cleaning member is also held in the holding frame, it is relatively easy to remove dirt from the cleaning member and recycle it, so that it is easy to reuse it.

[Brief explanation of the drawing]

1 to 4 are side views of essential parts showing an example of a conventional roller fixing device, FIG. 5 is a perspective view of essential parts showing an example of the roller fixing device of the present invention, and FIG. 6 is a partial front view, and FIG. Figure 7 is a partial side view seen from the scraping blade side, Figures 8 to 10
The figure is a partial front view showing an example of the shape of the scraping tip of the scraping blade, Figures 11 and 12 are side views of main parts showing other examples of the roller fixing device of the present invention, and Figure 13 is oil application. It is a sectional view showing other examples of a member. 1.2...Fixing roller, 3...Heat source, 4...
Oil tank, 5... Oil transfer part, 6... Oil application part, 7... Scraping member, 10... Holding frame, 11... Equipment frame upper cover, 12... Mounting on rail,
13...Cleaning member, 13a...Roller core,
13b...Cleaning layer, 14...Scraping blade. Patent applicant Konishiroku Photo Industry Co., Ltd. (13) Figure 1 Figure 2 Figure 6 Figure 7 Figure 6 Figure 9 Figure 10 Figure 13

Claims (6)

[Claims] (1) A support with a toner image attached to its surface is passed between a pair of pressure rollers to which an anti-offset liquid is applied to the roller on the side to which the toner image is attached, and the toner image is formed by applying pressure or further heating. In a device for fixing a fixing device frame to a support, an anti-offset liquid applying member is held by a holding frame having a scraping blade at one end, and the holding frame is fitted onto a rail to prevent the fixing device frame from being attached by the anti-offset liquid applying member. An anti-offset liquid is applied to the roller, and the mounting of the holding frame is configured such that the surface of the roller is rubbed parallel to the axis by the scraping blade when it is attached to and detached from the rail. Characteristic roller fixing device. (2) The roller fixing device according to claim 1, wherein the holding frame also holds a cleaning member for cleaning the surface of the roller before the anti-offset liquid application member applies the anti-offset liquid to the roller. Device. (3) The roller fixing device according to claim 1 or 2, wherein the scraping blade of the holding frame is made of silicone rubber. (4) The roller fixing device according to claim 1 or 2, wherein the scraping blade of the holding frame is made of fluororubber. (5) The roller fixing device according to claim 1 or 2, wherein the scraping blade of the holding frame is made of tetrafluoride resin. (6) The roller fixing device according to claim 1 or 2, wherein the scraping blade of the holding frame is made of perfluoroalkoxyethylene resin.