JP2004111126A - Heating roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating roller wherein the surface temperature of a heating cylindrical body is uniformized by keeping constant the light irradiation distance between a luminous part and the inner surface of the cylindrical body of each incandescent lamp through a configuration in which the luminous parts of the respective incandescent lamps are disposed on a line when the plurality of incandescent lamps are disposed within the cylindrical body making up the heating roller. <P>SOLUTION: This heating roller 1 equipped with the heating cylindrical body 2 and the plurality of both-end sealed type incandescent lamps 3 and 4 axially disposed within the cylindrical body 2, is characterized in that the lamps 3 and 4 are characterized by each having the luminous part and a non-luminous part with bent parts used as boundaries in a luminous tube having the bent parts and by being disposed so that the respective luminous parts 41, 33, and 45 of the respective lamps 3 and 4 are on the same line. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heating roller used for a toner image fixing device in an electrophotographic copying machine, a laser printer, a facsimile, and the like.
[0002]
[Prior art]
Conventionally, when recording paper of different paper sizes is heated by one heating roller, a plurality of lamps are arranged in the roller, and each lamp is selectively used and lit according to the recording paper to be heated. (For example, see Patent Document 1)
FIG. 6 is a view showing an example of the structure of the heating roller. FIG. 6A is a cross-sectional view of a lamp provided on the heating roller in a direction perpendicular to the tube axis direction, and FIG. It is sectional drawing.
As shown in the figure, this heating roller has a main lamp and a sub lamp arranged in a heating cylinder. For example, when heating the recording paper of A3, both the main lamp and the sub lamp are turned on, and the A4 In the case of heating a recording paper having a small width, such as the above, only the main lamp disposed at the center is turned on.
[0003]
With this configuration, it is possible to achieve power saving as compared with a heating roller configured with a single lamp, and when heating a narrow recording paper such as A4, the entire heating cylinder is heated. This can solve the problem of hot offset or the like in which the temperature of the end portion of the heating cylindrical body is excessively increased and thermally deformed.
[0004]
[Patent Document 1]
JP-A-8-16030 (FIGS. 1 to 3)
[0005]
[Problems to be solved by the invention]
However, as shown in FIG. 6, when two lamps are arranged in the heating cylinder, the light irradiation distance to the heating cylinder inner surface differs for each lamp because the light emission position of each lamp is not on the same line. Come. In recent years, in order to increase the rising speed of the heating roller, the thickness of the heating cylinder tends to be reduced, and when the irradiation distance of the light to the inner surface of the heating cylinder is different for each lamp, the heating cylinder is further increased. The problem that the surface temperature becomes non-uniform occurs.
[0006]
More specifically, when the distance between the filament of the main lamp and the bottom of the heating cylinder is 18 mm and the distance between the filament of the sub lamp and the bottom of the heating cylinder is 12 mm in FIG. The difference in heat quantity between the central portion and both ends is 2.3 times, the surface temperature of the heating cylinder becomes uneven, and it becomes difficult to control the heater.
[0007]
SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to arrange a plurality of incandescent lamps inside a heating cylinder constituting a heating roller, such that the light emitting portions of the respective incandescent lamps are arranged on the same line. It is an object of the present invention to provide a heating roller in which the light irradiation distance between the light emitting part of each incandescent lamp and the inner surface of the heating cylinder is made constant to make the surface temperature of the heating cylinder uniform.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
A first means is a heating roller including a heating cylinder, and a plurality of sealed incandescent lamps arranged at both ends in an axial direction inside the heating cylinder, wherein each of the incandescent lamps has a bent portion. A light emitting portion and a non-light emitting portion are provided within the arc tube with the bent portion as a boundary, and the light emitting portions of the incandescent lamps are arranged so as to be on the same line.
[0009]
According to a second aspect, in the first aspect, the axis of the light emitting section is provided eccentrically from the axis of the heating cylinder.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1A is a perspective view showing a configuration of a heating roller according to the present invention, FIG. 1B is a cross-sectional plan view of the heating roller, and FIG. 2 is disposed inside a heating cylinder of the heating roller. FIG. 5 is a diagram showing a process of combining incandescent lamps.
[0011]
In these figures, 1 is a heating roller, 2 is made of metal, ceramics, etc., heated by an incandescent lamp, and heated cylindrical bodies provided with gears. A double-sided incandescent lamp 5 having a light emitting portion and a non-light emitting portion is provided on one end side of the heating cylinder 2 and is a gear provided for rotating the heating cylinder 2. . Note that the gear 5 is omitted in FIG.
[0012]
Incandescent lamp 3 includes a light emitting portion 33 emitting filament f ₁ filament strands inside is closely wound in a coil form is present, the non-light-emitting filament filament strands therein is wound in a linear shape or sparse those having a non-light emitting portion 31, 35 f ₂ is present, and the bent portion 32 as a boundary, the non-light emitting portion 31, the light emitting portion 33, are arranged in the order of the non-light emitting portion 35. Incandescent lamp 4 includes a light emitting portion 41, 45 light-emitting filament f ₁ filament strands inside is closely wound in a coil form is present, filament strands therein is wound in a linear shape or sparse non emitting filament f ₂ are those having a non-light emitting portion 43 are present, and the bent portion 42 as a boundary, the light emitting unit 41, the non-light emitting portion 43, are arranged in the order of the light emitting portion 45.
[0013]
As shown in FIGS. 1A and 1B, each of the incandescent lamps 3 and 4 is disposed on the same axis as the heating cylinder 2 in the heating cylinder 2 and has a light emitting filament f inside the incandescent lamp 3. a light emitting portion 41, 45 having a light emitting filament f ₁ inside the light emitting portion 33 and the incandescent lamp 4 is arranged in combination such that collinear to each other with _one.
[0014]
2, the light emitting part 33 of the incandescent lamp 3 includes the light emitting part 33 of the incandescent lamp 4 in a space formed between the bent parts 42, 44 and the non-light emitting part 43 of the incandescent lamp 4, as shown in FIG. Are arranged so as to be located on the same line as.
[0015]
As described above, according to the present embodiment, the incandescent lamps 3 and 4 are turned on when heating a large-size recording sheet, and only the incandescent lamp 3 is used when heating a small-size recording sheet. Since the lamps can be turned on, it is possible to solve problems such as power saving and hot offset, and when the two incandescent lamps 3 and 4 are turned on, the light emitting portions of the respective incandescent lamps 3 and 4 from the same line. Can be emitted, so that the light irradiation distance between the light emitting portions of the incandescent lamps 3 and 4 and the inner surface of the heating cylinder 2 can be made constant, and the surface temperature of the heating cylinder 2 can be made uniform. .
[0016]
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a diagram showing a process of assembling the incandescent lamps disposed in the heating cylinder of the heating roller according to the embodiment of the present invention.
[0017]
In the drawing, reference numerals 6, 7, and 8 denote incandescent lamps each having a bent portion and having a light-emitting portion and a non-light-emitting portion bordering the bent portion. Each incandescent lamps are to understand the positional relationship between the light emitting portion and the light-emitting filament f _1, and a non-light-emitting filament f ₂ the positional relationship between each non-light emitting portion.
[0018]
Here, an incandescent lamp 6 to the bent portions 62 and 64 as a boundary, the non-light emitting portion 61, the light emitting unit 63 having a light emitting filament f ₁ therein, are arranged in order of the non-light emitting portion 65, the incandescent lamps 7, bent and the parts 72, 74, 76, 78 as a boundary, the non-light emitting portion 71, the light emitting unit 73 having a light emitting filament _{f 1} therein, a non-light emitting portion 75, the light emitting unit 77 having a light emitting filament _{f 1} therein, a non-light emitting portion are arranged in the order of 79, the incandescent lamp 8, the bent portion 82 and 84, in the boundary, the light emitting unit 81 having a light emitting filament _{f 1} therein, a non-light emitting portion 83, the light emitting unit 85 having a light emitting filament _{f 1} inside Are arranged in this order.
[0019]
Although not shown, the incandescent lamps 6, 7, and 8 are arranged in the heating cylinder 2 on the same axis as the heating cylinder 2 as shown in FIG. The light-emitting portions 73 and 77 of the incandescent lamp 7 and the light-emitting portions 81 and 85 of the incandescent lamp 8 are arranged so as to be on the same line.
[0020]
As shown in FIG. 3, first, the light emitting portion 63 of the incandescent lamp 7 is provided with the light emitting portion 63 of the incandescent lamp 7 in a space formed between the bent portions 74 and 76 and the non-light emitting portion 75 of the incandescent lamp 7. , 77 are arranged on the same line. Next, each of the space formed between the bent portion 72 of the incandescent lamp 7 and the non-light emitting portion 71 and the space formed between the bent portion 78 of the incandescent lamp 7 and the non-light emitting portion 79 is provided with the light emitting portion of the incandescent lamp 8. Each of the light emitting portions 81 and 85 is arranged so as to be located on the same line as the light emitting portions 73 and 77 of the incandescent lamp 7.
[0021]
As described above, according to the embodiment of the present invention, the incandescent lamps 6, 7, and 8 are turned on when heating large-sized recording paper, and the incandescent lamps 6 and 7 are used when heating medium-sized recording paper. When the small-sized recording paper is turned on, only the incandescent lamp 6 can be turned on, so that problems such as power saving and hot offset can be solved. When the lamps 6, 7, 8 are turned on at the same time, the respective incandescent lamps 6, 7 or the respective light emitting portions of the incandescent lamps 6, 7, 8 can be caused to emit light from the same line. The light irradiation distance between the heating cylinder 2 and the inner surface of the heating cylinder 2 can be made constant, and the surface temperature of the heating cylinder 2 can be made uniform.
[0022]
Further, according to the invention of the present embodiment, it is possible to more minutely control the uniformization of the surface temperature of the heating cylindrical body 2 according to the size of the recording paper as compared with the first embodiment.
[0023]
Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a view showing a process of assembling the incandescent lamps disposed in the heating cylinder of the heating roller according to the embodiment of the present invention.
[0024]
In the figure, reference numerals 9, 10, and 11 denote incandescent lamps having a bent portion and having a light emitting portion and a non-light emitting portion with the bent portion as a boundary. Each incandescent lamps are to understand the positional relationship between the light emitting portion and the light-emitting filament f _1, and a non-light-emitting filament f ₂ the positional relationship between each non-light emitting portion.
[0025]
Here, an incandescent lamp 9, and the bent portion 92 as a boundary, the non-light emitting portion 91, the light emitting unit 93 having a light emitting filament f ₁ therein, are arranged in order of the non-light emitting portion 95, incandescent lamp 10 bent and the part 102 as a boundary, the light emitting portion 101 having a light emitting filament f ₁ therein, are arranged in order of the non-light emitting portion 103, the incandescent lamp 11, and the bent portion 112 as a boundary, the non-light emitting portion 111, the light emitting filaments in the interior They are arranged in the order of the light emitting portion 113 having f _1.
[0026]
Although not shown, each of the incandescent lamps 9, 10, and 11 is disposed on the same axis as the heating cylinder 2 in the heating cylinder 2 as shown in FIG. The light emitting unit 101 of the incandescent lamp 10 and the light emitting unit 113 of the incandescent lamp 11 are arranged in combination so as to be on the same line with each other.
[0027]
As shown in FIG. 4, the assembling method first includes, in each of the space formed on the side of the non-light emitting portion 111 of the incandescent lamp 11 and the space formed on the side of the non-light emitting portion 103 of the incandescent lamp 10, The light emitting unit 101 of the incandescent lamp 10 and the light emitting unit 113 of the incandescent lamp 11 are arranged so as to be located on the same line. Next, in the space formed between the bent portion 102 and the non-light emitting portion 103 of the incandescent lamp 10 and between the bent portion 112 and the non-light emitting portion 111 of the incandescent lamp 11, the light emitting portion 93 of the incandescent lamp 9 is provided. The light emitting unit 101 and the light emitting unit 113 of the incandescent lamp 11 are arranged on the same line.
[0028]
As described above, according to the invention of this embodiment, the incandescent lamps 9, 10, and 11 are turned on when heating a large-sized recording paper, and only the incandescent lamp 9 is used when heating a small-sized recording paper. Since the lamps are turned on, it is possible to solve problems such as power saving and hot offset, and when the incandescent lamps 9, 10, 11 are simultaneously turned on, each of the incandescent lamps 9, 10, 11 from the same line. Since the light emitting portion can emit light, the light irradiation distance between the light emitting portion of each incandescent lamp and the inner surface of the heating cylinder 2 can be made constant, and the surface temperature of the heating cylinder 2 can be made uniform.
[0029]
Furthermore, according to the present embodiment, it is possible to control the light emission amount of the light emitting unit 101 of the incandescent lamp 10 and the light emitting unit 113 of the incandescent lamp 11 to be different from those of the first and second embodiments. Therefore, it is possible to control the amount of heat generated at both ends of the heating cylinder 2 so as to be different. As a result, since the gear is provided on one end side of the heating cylinder 2, the light emitting portion 101 of the incandescent lamp 10 and the incandescent lamp may be provided even if the heat radiation amounts may be different at both ends of the heating cylinder 2. By controlling the light emission amounts of the 11 light emitting units 113 to be different from each other, the surface temperature of the heating cylinder 2 can be made uniform as a whole.
[0030]
In the first embodiment in FIGS. 1 and 2, but a non-light-emitting filament f ₂ of the non-light emitting portion 31, 35 of the incandescent lamp 3 is in a straight line, the amount of heat generated per unit length emitting filament it may be wound in a coil shape so as to slightly exothermic to the extent that is lower than the f _1.
[0031]
In this case, the non-light-emitting portions 31 and 35 of the incandescent lamp 3 do not emit light completely, but emit light slightly. However, the heat radiation at both ends of the heating cylinder 2 is very large, and only the filament design of the incandescent lamp 4 is required. If this cannot be done, the light emission from the non-light-emitting portions 31 and 35 can compensate for the heat radiation.
[0032]
The same can be said for FIG. 3 of the second embodiment and FIG. 4 of the third embodiment.
[0033]
In FIG. 3, the non-light-emitting portions 61 and 65 of the incandescent lamp 6 and the non-light-emitting portions 71 and 79 of the incandescent lamp 7 may additionally emit light in order to eliminate the influence of heat radiation at both ends of the heating cylinder. Further, the non-light emitting portion 75 of the incandescent lamp 7 may also emit light slightly. This is because the light-emitting portion 63 of the incandescent lamp 6 and the light-emitting portions 73 and 77 of the incandescent lamp 7 are not physically continuous, so that the bent portions 62 and 64 of the incandescent lamp 6 and the bent portions 74 and 76 of the incandescent lamp 7 are not. Since the calorific value falls, it compensates for the calorific value.
[0034]
FIG. 4 shows that the non-light-emitting portions 91 and 95 of the incandescent lamp 9, the non-light-emitting portion 103 of the incandescent lamp 10, and the non-light-emitting portion 111 of the incandescent lamp 11 emit light in various patterns in an auxiliary manner. The non-light-emitting portion of each incandescent lamp may be made to emit light slightly in order to eliminate the influence of heat radiation or to reduce the amount of heat generated at the bent portion of each incandescent lamp.
[0035]
In other words, in the present invention, as described above, the non-light-emitting portion is not limited to the one that does not completely emit light, and the amount of heat generated per unit length is generated by the light-emitting portion in order to uniformly heat the heating cylinder. This includes those that generate a little heat to such an extent that they are lower than that.
[0036]
In each of the above embodiments, where the light emitting portions of the incandescent lamps arranged on the same line are arranged in the heating cylinder of the heating roller is not particularly specified. However, for example, in the first embodiment, as shown in the sectional view in the direction perpendicular to the tube axis direction of the incandescent lamp provided in the heating roller in FIG. The axes Y of the light emitting portions 41, 33, 45 of the arranged incandescent lamps 3, 4 may be arranged so as to be eccentric from the center axis X of the heating cylinder 2.
[0037]
When the heating cylinder 2 is disposed eccentrically, the portion immediately before the heating cylinder 2 hits the recording paper can be positively heated, so that the toner can be sufficiently fixed with a small amount of electric power.
[0038]
【The invention's effect】
According to the first aspect of the present invention, in a heating roller including a heating cylinder and a plurality of sealed incandescent lamps arranged at both ends in an axial direction inside the heating cylinder, each of the incandescent lamps is Since the light emitting tube having the bent portion has a light emitting portion and a non-light emitting portion bordering the bent portion, and the light emitting portions of the incandescent lamps are arranged so as to be on the same line, the size is large. The number of lighting of the incandescent lamp can be made different between when heating the recording paper of a small size and when heating the recording paper of a small size, so that problems such as power saving and hot offset can be solved. When the heat lamps are turned on, the light emitting parts of each incandescent lamp can emit light from the same line, so that the light irradiation distance between the light emitting part of each incandescent lamp and the inner surface of the heating cylinder can be kept constant. Can, It is possible to equalize the surface temperature of the heat cylinder.
[0039]
According to the second aspect of the present invention, since the axis of the light emitting portion is provided eccentrically from the axis of the heating cylinder, it is possible to actively heat the portion immediately before the heating cylinder hits the recording paper. Therefore, the toner can be sufficiently fixed with a small amount of electric power.
[Brief description of the drawings]
FIG. 1 is a perspective view and a plan cross-sectional view illustrating a configuration of a heating roller according to the first embodiment of the invention.
FIG. 2 is a view showing a process of assembling an incandescent lamp provided in a heating cylinder of a heating roller according to the first embodiment of the present invention;
FIG. 3 is a view showing a process of assembling an incandescent lamp provided in a heating cylinder of a heating roller according to a second embodiment of the present invention;
FIG. 4 is a view showing a process of assembling an incandescent lamp provided in a heating cylinder of a heating roller according to a third embodiment of the invention;
FIG. 5 is a cross-sectional view in a direction perpendicular to the tube axis direction of the incandescent lamp of the heating roller according to the first embodiment of the invention.
FIG. 6 is a cross-sectional view and a side cross-sectional view in a direction perpendicular to a tube axis direction of a lamp provided on a heating roller according to the related art.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 heating roller 2 heating cylinder 3 incandescent lamps 31 and 35 non-light emitting portions 32 and 34 bent portions 33 light emitting portion 4 incandescent lamps 41 and 45 light emitting portions 42 and 44 bent portions 43 non-light emitting portions 6 incandescent lamps 61 and 65 non-light emitting portions 62, 64 bent portion 63 light emitting portion 7 incandescent lamp 71, 75, 79 non-light emitting portion 72, 74, 76, 78 bent portion 73, 77 light emitting portion 8 incandescent lamp 81 light emitting portion 82, 84 bent portion 83 non-light emitting portion 85 light emitting Part 9 incandescent lamps 91 and 95 non-light emitting parts 92 and 94 bent part 93 light emitting part 10 incandescent lamp 101 light emitting part 102 bent part 103 non-light emitting part 11 incandescent lamp 111 non-light emitting part 112 bent part 113 light emitting part

Claims (2)

In a heating roller including a heating cylinder and a plurality of incandescent lamps sealed at both ends arranged in the axial direction inside the heating cylinder,
Each of the incandescent lamps has a light emitting portion and a non-light emitting portion with the bent portion as a boundary in an arc tube having a bent portion, and is arranged such that the light emitting portions of the incandescent lamps are on the same line. A heating roller. The heating roller according to claim 1, wherein an axis of the light emitting unit is provided eccentrically from an axis of the heating cylinder.

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