JPH10221997A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device capable of preventing a cleaning member from coming into direct contact with a cleaning roller, so as to eliminate the nonrotation of the cleaning roller with an oil coating roller, caused by the high sliding resistance between the cleaning member and the cleaning roller and making it a clean state, so as to prevent the degradation of cleanability for the oil coating roller. SOLUTION: The fixing device is provided with the fixing roller, a pressure roller, the oil coating roller 11 coming into contact with the fixing roller and the cleaning roller 12 coming into contact with the oil coating roller 11. The cleaning member 13 is arranged with a very small interval from the outer periphery of the cleaning roller 12 and when foreign matter is heaped on the outer periphery of the cleaning roller 12 by the cleaning member 13 by the above-mentioned interval or more, the cleaning member 13 removes the foreign matter of a part exceeding the above-mentioned interval.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a fixing roller,
The present invention relates to a fixing device including a pressure roller.

[0002]

2. Description of the Related Art A typical fixing device of this type is as shown in FIG. 8, wherein 1 is a fixing roller having a release layer provided on the outer peripheral surface, 2 is a pressing roller, 3 is a heater, 4 is a thermistor, 5 is a separation claw, 6 is a paper ejection guide,
7 is a lower discharge guide, 8 is a discharge roller, 9 is a lower entrance guide,
Reference numeral 10 denotes transfer paper, 11 denotes an oil application roller, 12 denotes a cleaning roller, 13 denotes a cleaning member including a blade-like member, and 14 denotes an unfixed toner image.

In such a device, the unfixed toner image 14 is fixed on the transfer paper 10 by being heated under pressure at the nip between the fixing roller 1 and the pressure roller 2. Then, an oil application roller 11 rotating around the fixing roller 1 applies the silicone oil contained therein to the fixing roller 1,
The fixing roller 1 is cleaned. When the cleaning roller 12 rotates in contact with the oil application roller 11, the contamination such as toner and paper dust adhered to the surface of the oil application roller 11 is cleaned. By the way, in such a device, the dirt adheres to the cleaning roller 12, and there is a problem that the dirt accumulates over time and is re-transferred to the oil application roller 11, thereby soiling the oil application roller 11. .

[0004]

In order to solve such a problem, the cleaning member 13 is brought into direct contact with the cleaning roller 12 so that the cleaning member 13 cleans the dirt accumulated on the cleaning roller 12. ing. However, in such a case, since the sliding resistance between the cleaning roller 12 and the cleaning member 13 increases,
There is a problem in that the cleaning roller 12 does not rotate with the oil application roller 11 or that the cleaning roller 12 is made of metal.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional fixing device, so that the cleaning member does not directly come into contact with the cleaning roller, the sliding resistance between the two members is large, and the cleaning roller can be used. An object of the present invention is to provide a fixing device that does not become displaced with the oil application roller and that does not deteriorate the cleaning performance of the oil application roller by keeping the cleaning roller in a clean state.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fixing roller, a pressure roller, an oil application roller contacting the fixing roller, and a cleaning contacting the oil application roller. In a fixing device provided with a roller, the invention according to claim 1, wherein a cleaning member is disposed at a minute interval between the cleaning roller and the outer peripheral surface of the cleaning roller. The cleaning member removes a portion of the foreign matter that is equal to or longer than the interval when the accumulation is equal to or longer than the interval.

According to a second aspect of the present invention, in the first aspect of the present invention, a smoothing member is provided downstream of the cleaning member to smooth the surface of the foreign matter adhered to the surface of the cleaning roller. It is assumed that.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the cleaning member is formed by a web-like member or a blade-like member that can be wound up. It is.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the contact angle of the cleaning member constituted by the blade-like member with the cleaning roller is substantially a right angle. Is what you do.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In each embodiment shown in the drawings,
The same parts as those of the related art are denoted by the same reference numerals, and the description thereof will be omitted. The different parts will be mainly described. In the first embodiment of the present invention shown in FIGS. 1 and 2, the cleaning member 13 is arranged at a minute interval w between the cleaning member 12 and the outer peripheral surface. And cleaning roller
When the thickness w ′ of the dirt 15 such as toner and paper dust deposited on the sheet 12 exceeds the minute interval w as shown in FIG. The Rukoto. As a result, the cleaning roller 12 and the cleaning member 13
The cleaning resistance of the cleaning roller 12 does not increase and the cleaning roller 12 does not hang around the oil application roller 11, and the cleaning roller 12 does not become clean. Inferiority does not occur.

The second and third embodiments shown in FIGS. 3 and 4 use a smoothing member for smoothing the surface of foreign matter adhering to the surface of the cleaning roller 12 downstream of the cleaning member 13 in the rotation direction of the cleaning roller 12. The difference between the first embodiment and the first embodiment is that there are no other differences. The second embodiment is different from the first embodiment only in that the leveling member 16 is configured by a mylar-shaped member and the third embodiment is configured by the leveling member 16 by a roller-shaped member. It is. These leveling members 16 smooth the surface of the dirt 15 roughened by the cleaning member 13 to a smooth surface, and reliably prevent the dirt 15 from re-adhering to the surface of the oil application roller 11. Become.

The fourth embodiment shown in FIG. 5 differs from the third embodiment only in that the cleaning member 13 is constituted by a web-shaped member, and there is no other difference. In this embodiment, the cleaning member 13 is stretched between the unwind roller 17 and the take-up roller 18, and the drive member (not shown) rotates the take-up roller 18 so that the cleaning surface of the cleaning member 13 is always cleaned. Since cleaning is performed, a stable cleaning action can be performed.

FIG. 6 shows a fifth embodiment of the present invention, in which a cleaning roller 12 of a cleaning member 13 made of a web-like member is used.
Only the difference from the first embodiment is that the contact angle to the contact angle is substantially right, and there is no other difference. This embodiment has the above-described configuration, and in the case where the cleaning member 13 is used with time, as shown in FIG. After passing,
It is possible to avoid that one of which is turned around is deposited in the wedge-shaped space between the cleaning roller 12 and the cleaning member 13 and collectively drops at a certain point in time, thereby contaminating other members. .

[0014]

As described above, the present invention is directed to a fixing device including a fixing roller, a pressure roller, an oil application roller contacting the fixing roller, and a cleaning roller contacting the oil application roller. According to the first aspect of the present invention, the cleaning member is disposed at a minute interval from the outer peripheral surface of the cleaning roller. Since the member removes a portion of the foreign matter that is longer than the interval, the cleaning member does not directly contact the cleaning roller, so that the sliding resistance of both members is large and the cleaning roller does not hang around the oil application roller. And the cleaning roller is kept in a clean state, so that the cleaning property for the oil application roller is deteriorated. There is an effect that door's not.

According to a second aspect of the present invention, in the first aspect of the present invention, a smoothing member is provided downstream of the cleaning member to smooth the surface of the foreign matter adhered to the surface of the cleaning roller. The cleaning member has an effect that the surface of the dirt roughened by the cleaning member is leveled to a smooth surface, and the dirt is reliably prevented from re-adhering to the surface of the oil application roller.

According to the third and fourth aspects of the present invention, in the first or second aspect of the present invention, the cleaning member is constituted by a rollable web-like member or a blade-like member. In this case, the cleaning is always performed on the clean surface of the cleaning member, so that a stable cleaning action can be performed. In the case of the blade-shaped member, there is an effect that the structure can be provided simply and inexpensively. .

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, since the contact angle of the cleaning member constituted by the blade-like member with the cleaning roller is substantially a right angle, it can be used over time. In this case, after the dirt has passed through the cleaning member, the back of the dirt may accumulate in the wedge-shaped space between the cleaning roller and the cleaning member, and collectively fall at a certain point in time, thereby contaminating other members. There is an effect that can be avoided.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a first embodiment of the present invention.

FIG. 2 is an operation explanatory view of the above.

FIG. 3 is a front view of a main part according to a second embodiment of the present invention.

FIG. 4 is a front view of a main part according to a third embodiment of the present invention.

FIG. 5 is a front view of a main part according to a fourth embodiment of the present invention.

FIG. 6 is a front view of a main part according to a fifth embodiment of the present invention.

FIG. 7 is a front view of a main part according to a sixth embodiment of the present invention.

FIG. 8 is a front view of a conventional fixing device of the same type as the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fixing roller 2 Pressure roller 3 Heater 4 Thermistor 5 Separation claw 6 Discharge upper guide 8 Discharge roller 9 Inlet lower guide 10 Transfer paper 11 Oil application roller 12 Cleaning roller 13 Cleaning member 14 Unfixed toner image 15 Dirt 16 Leveling member 17 Unwind roller 18 Take-up roller

Claims (5)

[Claims] 1. A fixing device comprising a fixing roller, a pressure roller, an oil application roller in contact with the fixing roller, and a cleaning roller in contact with the oil application roller. A fixing device, wherein a cleaning member is arranged at a minute interval, and when foreign matter is deposited on the outer peripheral surface of the cleaning roller by the cleaning member at the interval or more, the cleaning member removes a portion of the foreign material at or above the interval. . 2. The fixing device according to claim 1, wherein a smoothing member is provided downstream of the cleaning member in the rotation direction of the cleaning roller to smooth the surface of the foreign matter attached to the surface of the cleaning roller. apparatus. 3. The fixing device according to claim 1, wherein the cleaning member is configured by a web-shaped member that can be wound up. 4. The fixing device according to claim 1, wherein the cleaning member comprises a blade-shaped member. 5. The fixing device according to claim 4, wherein a contact angle of the cleaning member constituted by the blade-shaped member to the cleaning roller is substantially a right angle.