JPH0864342A - Manufacture of heating roller and manufacturing equipment - Google Patents

Abstract

PURPOSE: To provide the manufacturing method for and manufacturing equipment of a heating roller with better resistance value distribution in the circumferential direction. CONSTITUTION: Resinated paste is printed on the outer circumferential surface of a glass cylinder 30 with a curved surface printing machine to form a printed part 40 and a space 38 is generated by this printing. A cylinder 86 of a paste filling device 48 is moved along the axial direction of the glass cylinder 30 and the resinated paste is discharged in the space 38 through a needle 118. The resinated paste is filled in the space 38 so that the thickness of the film is almost the same, after baking, as that of the printed part 40 previously formed. A resistant heating element layer 34 is formed in almost the same thickness on the whole outer circumferential surface of the glass cylinder 30 and the space 38 does not exist in part in the circumferential direction. The resistance value distribution in the circumferential direction of a heating roller 10 is almost uniformed, and uneven temperature in the circumferential direction is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a heating roller used for toner fixing of an electrostatic copying machine, and more particularly to a technique for obtaining a uniform resistance value distribution in the circumferential direction.

[0002]

2. Description of the Related Art For example, in a copying machine in which a toner image is transferred onto paper or the like and then fixed, paper or the like on which toner is transferred is passed between a heating roller and a pressure roller provided in the copying machine. Accordingly, pressure is applied simultaneously with heating to fix the toner on paper or the like. One of the heating rollers is one in which a resistance heating element layer is provided on the outer peripheral surface of an electrically insulating substrate having a cylindrical outer peripheral surface. For example, Japanese Patent Laid-Open No. 63-158582 is one of them. According to such a surface heating type heating roller,
Since the surface that comes into contact with paper or the like is directly heated, the remaining heat time is shorter than that of an internal heat-generating type that has a halogen lamp or the like as a heat source inside a conventionally used cylindrical roller, and It has the advantage of lower power consumption.

[0003]

By the way, since the cylindrical heating roller as described above is generally used while being rotated, it is desired that the temperature distribution in the circumferential direction be as uniform as possible. For example, in order to reliably fix the toner in the above copying machine, it is necessary to heat the toner in a predetermined temperature range (for example, about 160 to 180 ° C.) determined by the toner, which is disclosed in the above publication. In this technology, a resistive paste is printed on a sheet by screen printing using a screen on which a resistive heating element pattern is formed, transferred to the outer peripheral surface of a cylindrical substrate, and then heated and baked. A layer is formed. Therefore, a seam at the time of transfer (that is, a gap or overlap of the resistor pattern) is formed in the resistance heating element layer, a resistance value distribution is generated in the circumferential direction, and the temperature distribution is deteriorated in the circumferential direction of the heating roller. As a result, there is a problem that uneven fixing of toner occurs. Even if the resistor paste is directly printed on the cylindrical substrate by curved surface printing using the above screen, a heating roller similar to that described in the above publication can be obtained. There is a similar problem because a seam is formed between the end and the end.

The distribution of the resistance value in the circumferential direction due to the occurrence of the above-mentioned seam is, for example, the width (circumferential length) of the seam is made as small as possible, or the resistance heating element layers are laminated and formed in the circumferential direction of the seam. The position can be reduced by separating the stacked layers from each other as much as possible. However, even with such a technique, the heating roller is set to a predetermined condition in a relatively short time period (for example, after the switch of the copying machine is turned on until the copy sheet reaches the heating roller). In the case where a high voltage is applied to raise the temperature to the fixing temperature), a relatively large temperature distribution occurs due to the presence of the seam. Moreover, the width of the seam is difficult to control because the width of the cylindrical substrate used can fluctuate within π times the tolerance when the outer diameter of the cylindrical substrate fluctuates within the tolerance. On the other hand, the resistance heating element layers are laminated and formed. In such a case, there is a problem that the resistance heating element layer becomes thick and the heat capacity increases, and the process becomes complicated and the manufacturing cost increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a manufacturing method and a manufacturing apparatus for a heating roller having a better circumferential resistance distribution.

[0006]

In order to achieve such an object, the gist of the first invention is to provide a resistance heating element on the outer peripheral surface of an electrically insulating substrate having a cylindrical outer peripheral surface. A method of manufacturing a heating roller provided with a layer, comprising: (a)
A film forming step of forming a film on which the resistor paste is fixed so that a gap having a predetermined width in the circumferential direction is formed on the outer peripheral surface of the electrically insulating substrate by screen printing; and (b) a discharge thin tube. The tip of the discharge thin tube of the paste discharging device is relatively moved in the direction parallel to the axial direction of the electrically insulating substrate on the gap, and the resistor paste is discharged through the discharge thin tube to form the film. A paste filling step of filling the gap with the resistor paste in a thickness substantially similar to, and (c) a firing step of producing a thin film metal by firing the resistor paste filled in the film and the gap. Is included.

[0007]

With this configuration, in the film forming step, the resistor paste is fixed to the outer peripheral surface of the electrically insulating substrate so that a gap of a predetermined width is formed in the circumferential direction. In the paste filling step, while the paste discharge device is relatively moved in the axial direction, the resistor paste is discharged through the discharge thin tube, so that the resistance has a thickness substantially similar to that of the film. The body paste is filled, and in the firing process, a thin film metal, that is, a resistance heating element layer is generated from the resistor paste filled in the film and the gap. Therefore, the resistance heating element layer is formed on the entire outer peripheral surface of the electrically insulating substrate with substantially the same thickness, and there is no gap in the circumferential direction. Therefore, the resistance value distribution in the circumferential direction of the heating roller becomes substantially uniform, and the temperature unevenness in the circumferential direction is reduced.

Moreover, the width of the gap varies depending on the variation of the outer diameter of the electrically insulating substrate, but the gap is filled with the resistor paste with a thickness substantially similar to that of the film. The resistance value distribution in the circumferential direction is made substantially uniform regardless of the width dimension. On the other hand, in the conventional technique of reducing the resistance value distribution by controlling the size of the seam (gap or overlap), it is difficult to control the size of the seam due to the variation in the outer diameter of the electrically insulating substrate. It was difficult to make the resistance value distribution sufficiently uniform.

The film forming step is not particularly limited as long as it uses a screen on which a resistor pattern is formed. For example, a resistor pattern screen-printed on a sheet is used as an electrically insulating substrate. Any method such as a transfer method of transferring to the outer peripheral surface or a method of directly printing on the outer peripheral surface by a curved surface printing machine may be used.

Further, the discharge capillaries used in the paste filling step may have various inner diameters.
For example, when the inner diameter is about the width of the gap, the resistor paste is filled in the gap by moving the electric insulating substrate once in the direction parallel to the axial direction. On the other hand, when the inner diameter dimension is smaller than the width of the gap, the relative movement is repeated a predetermined number of times based on the dimensional difference between the inner diameter dimension and the width of the gap, so that the resistor paste is similarly filled in the gap. Is filled.

Preferably, the resistivity of the resistor paste filled in the gap in the paste filling step is equal to the resistivity of the resistor paste for forming a film on the outer peripheral surface in the film forming step. The value has the above value.

That is, in the paste filling step, if the resistivity of the resistor paste filled in the gap is made lower than the resistivity of the resistor paste used for the film, or the thickness thereof is made thicker than the film, The resistance value of the gap portion becomes lower than the resistance values of other portions in the circumferential direction. In this case, when the resistance heating element layer is energized, the current is concentrated in the gap portion, which causes a temperature distribution in the circumferential direction. On the other hand, if the resistivity of the resistor paste filled in the gap is set to a value equal to or higher than that of the resistor paste used for the film, current concentration does not occur in the gap and the resistivity is relatively high. On the contrary, the current value may decrease, but the heat generated in other parts of the resistance heating element layer is also transmitted to the gap part, so that a substantially uniform temperature distribution in the circumferential direction can be obtained. .
Therefore, the resistivity of the resistor paste to be filled is preferably set to a value equal to or higher than the resistivity of the resistor paste used for forming the film.

[0013]

A second aspect of the present invention for attaining the above object is to provide resistance heating on an outer peripheral surface of an electrically insulating substrate having a cylindrical outer peripheral surface. A method for manufacturing a heating roller provided with a body layer, comprising:
(a) a film forming step of forming a film to which a resistor paste is fixed so as to form a gap having a predetermined width in the circumferential direction on the outer peripheral surface of the electrically insulating substrate by screen printing, (b)
A first firing step of producing a thin film metal having the gap of the predetermined width in the circumferential direction by firing the film, (c)
Discharging the resistor paste through the discharge capillary while relatively moving the tip of the discharge capillary of the paste discharger equipped with the discharge capillary in the direction parallel to the axial direction of the electrically insulating substrate on the gap. Thus, a paste filling step of filling the gap with the resistor paste in a thickness such that the thickness after firing is substantially the same as the thin film metal, and (d) firing the resistor paste filled in the gap. And a second firing step for producing a thin film metal.

[0014]

In this way, a thin film metal having a gap in the circumferential direction, that is, a resistance heating element layer is produced in the first firing step from the film formed in the same manner as in the first invention. In the paste filling step, while the paste discharging device is relatively moved in the axial direction, the resistor paste is discharged through the discharging thin tube, so that the thickness after firing becomes substantially the same as the thin film metal. The gap is filled with the resistor paste, and in the second firing step, a thin film metal is produced from the resistor paste filled in the gap. Therefore, the resistance heating element layer is formed on the entire outer peripheral surface of the electrically insulating substrate with substantially the same thickness, and there is no gap in the circumferential direction. Therefore, the resistance value distribution in the circumferential direction of the heating roller becomes substantially uniform, and the temperature unevenness in the circumferential direction is reduced. That is, the first firing step may be provided after the film forming step and before the paste filling step, and the thin film metal may be generated from the film prior to the paste filling.

[0015]

A third aspect of the present invention for attaining the above object is to provide resistance heating on an outer peripheral surface of an electrically insulating substrate having a cylindrical outer peripheral surface. A heating roller manufacturing apparatus provided with a body layer,
(a) Support for supporting the electrically insulating substrate having a film formed by fixing a resistor paste so as to have a gap in the circumferential direction on the outer peripheral surface so that the gap is located on the upper side. Means, (b) a paste ejecting device for ejecting the resistor paste onto the outer peripheral surface of the electrically insulating substrate through an ejection thin tube, and (c) the paste ejecting device in a direction parallel to the axial direction of the electrically insulating substrate. And axial drive means for relative movement.

[0016]

According to this structure, the film made of the resistor paste having a gap in the circumferential direction, which is formed by the method of the first or second invention described above, or the film is heated. The produced thin film metal is fixed to the outer peripheral surface of the electrically insulating substrate, which is supported by the supporting means so that the gap is located on the upper side, and the paste driving device provided with the discharging capillary by the axial driving means is the resistor paste. By being relatively moved in a direction parallel to the axial direction of the electrically insulative substrate while ejecting into the gap, the resistor paste can be filled into the gap with a thickness substantially the same as that of the thin film metal after firing. . Therefore, the resistance heating element layer is formed on the entire outer peripheral surface of the electrically insulating substrate with a substantially uniform thickness, and there is no gap in a part in the circumferential direction. Therefore, the resistance value distribution in the circumferential direction of the heating roller is made substantially uniform, and the temperature unevenness in the circumferential direction is reduced.

Here, preferably, the heating roller manufacturing apparatus comprises: (a) a circumferential direction driving means for relatively moving the distal end portion of the discharge thin tube in the circumferential direction of the outer peripheral surface of the electrically insulating substrate; (b) Control the relative movement amount in the circumferential direction and the number of relative movements in the axial direction by the axial driving means, based on the ratio of the inner diameter of the discharge thin tube and the width of the gap formed in the outer peripheral surface thereof. And a movement control means for controlling the movement.

With this configuration, even when the width of the gap is larger than the inner diameter of the discharge thin tube, the paste discharging device discharges the resistor paste while extending in the axial direction over the entire length of the electrically insulating substrate. After being relatively moved once in the parallel direction, the paste ejecting device and the electrically insulating substrate are relatively moved in the circumferential direction by the circumferential driving means by the amount and the number of times determined by the movement control means, and the resistor again. By repeating relative movement in the axial direction while discharging the paste, the resistor paste is filled in the gap with a thickness that is substantially the same as the thin film metal produced from the film previously formed after firing. It So, for example,
If a discharge thin tube having an inner diameter dimension that can obtain a coating width corresponding to the minimum width dimension gap that can be formed, it is possible to cope with various width dimension gaps only by changing the number of relative movements in the axial direction.

Further, preferably, the heating roller manufacturing apparatus comprises: (a) a circumferential direction driving means for relatively moving the tip end portion of the discharge thin tube in the circumferential direction of the outer peripheral surface of the electrically insulating substrate; b) an end portion detecting means for detecting a circumferential end portion of the gap, (c) an inner diameter dimension of the discharge thin tube, and a relationship between a position of the circumferential end portion of the gap detected by the end portion detecting means. Based on, the movement amount control means for controlling the relative movement amount in the circumferential direction, (d) when the end is no longer detected, the end to determine that the filling of the resistor paste into the gap has ended And a determining means.

According to this structure, the edge detecting means applies the film or the thin film metal formed from the film on the end of the gap, that is, the outer peripheral surface of the electrically insulating substrate, and the paste ejecting device. The circumferential end of the portion where none of the resistor paste is present is detected, and the relative movement amount in the circumferential direction is detected by the movement amount control means based on the relationship between the end position and the inner diameter of the discharge capillary. Is controlled, and the paste ejecting device and the electrically insulating substrate are relatively moved in the circumferential direction by the relative movement amount controlled by the circumferential driving means, application of the resistor paste is continued, and the end of the gap is detected. If not, the end determination means determines that the filling of the resistor paste is completed. Therefore, when the width of the gap is larger than the inner diameter of the discharge thin tube and the resistor paste is not filled in the gap by one relative movement in the axial direction, the ends of the gap are sequentially moved in the circumferential direction. By repeatedly detecting and applying the resistor paste, the resistor paste can be filled in the gaps having various width dimensions. Further, even when the gap is not formed parallel to the axis of the electrically insulating substrate, the resistor paste is placed in the gap by detecting the end portion and relatively moving in the circumferential direction while relatively moving in the circumferential direction. It will be filled.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a toner fixing portion of a copying machine to which a heating roller for toner fixing (hereinafter referred to as a heating roller) 10 which is an example of a heating roller manufactured by a manufacturing method according to an embodiment of the present invention is applied. It is a figure which shows the cross section of a principal part typically. In the figure, in the housings 12 and 14 fixed vertically with a predetermined interval, the silicone rubber 1 is provided on the outer peripheral surface of the heating roller 10 and, for example, an aluminum cylinder 16.
The pressure roller 20 and the pressure roller 20 are fixedly attached by means of a bearing (not shown).
The pressure roller 20 is pressed against each other with a predetermined force. Further, the distance between the inner peripheral surface of the housing 12 and the outer peripheral surface of the heating roller 10 is made small, about 1 mm, and the thermocouple 26 is inserted into a through hole provided from the outside of the housing 12 to the inner peripheral surface. It is attached, the internal temperature is detected, the voltage applied to the heating roller 10 is controlled by a control circuit (not shown), and the surface temperature is kept at an appropriate temperature. Then, when the recording paper 22 or the like on which the toner is transferred by a transfer device (not shown) is fed from the carry-in port 24, the resin contained in the toner is heated while being pressed between the heating roller 10 and the pressure roller 20. Is melted, and the toner is fixed on the recording paper 22 or the like.

The heating roller 10 has a glass cylinder 30 as shown in FIG. 2 and FIG. 3 which is a cross section perpendicular to the axis.
And a pair of electrodes 32, 32 provided annularly at both ends of the cylindrical outer peripheral surface thereof, and the pair of electrodes 32, 3
2 and a resistance heating element layer 34 that generates heat due to the current flowing between the electrodes 32 and 32, and a resistance heating element layer for protecting the resistance heating element layer 34 and preventing toner adhesion. And a protective film 36 that covers 34. In this embodiment, the glass cylinder corresponds to the electrically insulating substrate.

The glass cylinder 30 has a cylindrical outer peripheral surface.
Functioning as the base of the heating roller 10,
For example, total length 340mm, outer diameter 20 ± 0.15mm, wall thickness
Manufactured by drawing process with a size of about 1.0 mm
Low alkali glass (eg Na ₂O + K₂O 7.5
wt%, CaO + BaO 3.0 wt%, B₂O₃1
0.5 wt%, Al₂O₃7.0 wt%, SiO₂7
It consists of 2.0 wt% and its characteristic is thermal conductivity 0.002.
6 cal / sec ・ cm ・ ℃, specific heat 0.17 cal / g ・ ℃, softening point
It is a cylinder made of glass at about 790 ° C.).

The pair of electrodes 32, 32 are made of Ag (silver).
Alternatively, it is composed of Ag-Pd and Ag-Pt, for example, 15μ
It has a thickness of about m and is provided from both ends to a position of, for example, about 15 mm. The resistance heating element layer 34 is
For example, the electrodes 32 and 32 are provided in the intermediate portion excluding the portions up to about 13 mm from both ends, and the electrodes 32, 32 are overlapped on the resistance heating element layer 34 by about 2 mm, respectively.
Further, the protective film 36 has a thickness of 20 to 25 μm on the portion to which the resistance heating element layer 34 is fixed by a well-known method.
It is a fluororesin (for example, polytetrafluoroethylene) film formed to some extent.

The resistance heating layer 34 is made of resinate.
Metal Organic Compound (M)
Consisting of a liquid or paste containing OC), eg thick
A resin film having a thickness of about 6 μm is formed on the outer peripheral surface of the glass cylinder 30.
By forming and baking it to a thickness of 0.8 μm, for example
It is considered as a thin film metal. Resistance heating element layer 34
Is the direct printing or transfer method of resinate paste.
After fixing, it is heated to form a thin film metal.
Print unit 40 having 38 and heating generation of the print unit 40
Before or after heating, apply resinate paste to the gap 38.
Such as a filling part 42 that is metallized by filling and heating
It is composed of The width of this gap 38 (that is, the length in the circumferential direction)
Is about 0.36 to 1.30 mm, the filling portion 4
The thickness of 2 is, for example, about 0.7 μm,
The resinate paste filled in 2 forms the gap 38.
By overlapping the end of the printing unit 40,
W _O= About 0.2 mm overlap portion 44 is formed
It

The resinate paste is obtained by mixing and kneading a resinate, which is produced by dissolving a predetermined metal component and reacting it with an organic compound, with a resin. For example, Au shown in Table 1 below.
A (gold) resinate paste is used. Among the following metal components, Bi (bismuth), V (vanadium)
Etc. may be mixed in the form of oxide powder. Moreover, as the MOC, (C ₇ H ₁₅ S) _n −M, (C ₁₂ H
₂₅ S) _n -M (M represents a metal, n represents an arbitrary natural number. In Au, for example, n = 1), or a metal mercaptide such as abietic acid (C ₂₀ H ₃₀ O ₂ ). A metal resin balsam sulfide or the like having -SM bonded to the base is used.

[0028]

[Table 1]

The heating roller 10 has a resistance heating element layer 34 formed by using, for example, a curved surface printing machine 46 schematically shown in FIG. 4 and a paste filling device 48 shown in FIGS. 5 and 6. . The curved surface printing machine 46 includes a screen 50 on which a resistor pattern is formed and a squeegee 52. When the glass cylinder 30 is rotated in the direction of the arrow in the figure while contacting the screen 50 by a rotation driving device (not shown), The screen 50 is moved in the direction of the arrow in the figure at the same speed as the tangential speed of the outer peripheral surface of the glass cylinder 30, and the paste 54 on the screen 50 is applied to the outer peripheral surface of the glass cylinder 30 according to the resistor pattern. .

Further, the paste filling device 48 is arranged so as to face the outer peripheral surface of the glass cylinder 30 supported by the rotating device 56 which holds the glass cylinder 30 rotatably around its axis. It is composed of a paste coating device 58 for discharging the resistance heating element paste. In this embodiment, the rotating device 56 corresponds to the supporting means and the circumferential driving means.

The rotating device 56 comprises a rotating part 60 for rotating the glass cylinder 30, and a pressing part 62 for holding the glass cylinder 30 by pressing it toward the rotating part 60. The rotation unit 60 includes a rotation motor 64 such as a stepping motor and the rotation motor 6
A base 66 to which 4 is fixed, and a conical member 70 rotatably attached to a bearing 68 at a shaft portion (not shown) and rotated about its axis by the rotation motor 64 are provided. The pressing portion 62 includes a base 72, a first moving base 76 that is moved on the base 72 in the left-right direction in FIG.
A second movable table 78 mounted on the movable table 76 so as to be movable in the left-right direction and biased rightward in the figure by a spring or the like (not shown), and a bearing mounted on the second movable table 78. 80 and a conical member 82 having the same shape as the conical member 70 mounted on the bearing 80 so as to be rotatable around the axis of the shaft (not shown). These two conical members 70 and 82 are attached such that their axes are aligned.

On the other hand, in the paste applying device 58, a cylinder portion 86 having a paste discharging portion 84 at one end on the glass cylinder 30 side fixed to the rotating device 56 has a horizontal direction in FIG. 5, a vertical direction, and a left and right direction in FIG. It is provided so as to be movable in each direction. In the present embodiment, the cylinder portion 86 corresponds to the paste ejection device.

The cylinder portion 86 is a cylindrical cylinder 94 fixed to an up-and-down moving member 92 by an upper fixing member 88 and a lower fixing member 90 so that the axis of the cylinder portion is in the vertical direction.
By rotating the fine adjustment screw 96 and moving the vertical movement member 92 along the vertical movement rail 98, the vertical movement member 92 can be moved in the vertical direction in the figure. Vertical movement member 9
At the lower end of 2, a horizontal rotation member 102, which is rotatable about the axis of a screw 100 attached so that the axis is located in the vertical direction in the figure, is attached to the lower fixing member 90. It is attached via a pin and is fixed at a desired rotation angle. A vertical rotation support member 104 is fixed to the tip of the horizontal rotation member 102 by two bolts 106, 106, nuts 108, 108 and the like. The vertical rotation support member 104 is provided with a sandwiching portion 110 formed by providing two flat plate-shaped portions in parallel with each other in the left-right direction in FIG. The holding member 112 that holds the paste discharging portion 84 is rotatably held by the flat plate-shaped portion of the holding portion 110 around the axis of the screw 114, and by tightening the screw 114, a desired turning angle is obtained. Fixed by.

The paste discharging section 84 is a tube 116.
Is connected to the cylinder 94 by means of a needle 118 made of, for example, stainless steel having an inner diameter of about 0.3 mm and bending elasticity. The cylinder 94 is connected to a pressurized air supply device 122 via an air pipe 120.
The resistance heating element paste stored therein is discharged from the needle 118 at the tip of the paste discharging section 84 by the air pressure supplied from the pressure air supply device 122. In this embodiment, the needle 118 corresponds to a discharge thin tube.

Further, the vertical moving rail 98 is moved by rotating the fine adjustment screw 124.
6 is fixed to a horizontal moving member 128 that can be moved along the position 6, so that the paste discharge unit 84 can be moved as shown in FIG.
Can be moved left and right in. Further, the horizontal moving rail 126 is fixed to a shaft portion 132 of the vertical moving device 130 formed of, for example, an air cylinder, which can be projected and pulled in the vertical direction in the drawing. That is, the vertical movement of the paste discharging portion 84 is mainly performed by the operation of the vertical movement device 130, and the vertical movement by the rotation of the fine adjustment screw 96 is performed for the fine adjustment. In the figure, reference numeral 134 is a guide rod and 136 is a guide bush.

The vertical moving device 130 rotates the motor 138 on the moving rail 140 in a direction perpendicular to the plane of the drawing (that is, the glass cylinder 3 in FIG. 5).
It is fixed to a moving member 142 that is movable in a direction parallel to the 0 axis direction). As a result, the cylinder portion 86
Are moved in the left-right direction by rotation of the motor 138 within the range of two positions shown in FIG. 5, for example.
The motor 138 and the moving rail 140 are both fixed on the base 144. In this embodiment, the motor 138, the moving rail 140, and the moving member 1 are used.
42 constitutes the axial drive means.

The motor 138 and the motor 64 of the rotating device are connected to a control device 146 composed of a CPU, a RAM, a ROM and the like. In addition, the paste filling device 48 is connected to the cylinder portion 86 and the glass cylinder 3
An end detection device 148 is provided that is moved along its axial direction between both ends of 0. This edge detection device 1
The image sensor 48 includes, for example, an image sensor composed of a large number of CCD elements arranged in a direction perpendicular to the axial direction of the glass cylinder 30, and is located, for example, vertically above the axis of the glass cylinder 30, as will be described later. As a result, the film 150 made of the resinate paste printed on the outer peripheral surface of the glass cylinder 30 or the thin film metal (that is, the printing part 40) generated by heating from the film 150, such as the circumferential end of the gap 38, is generated. The position is detected. In this embodiment, the edge detecting device 148 corresponds to edge detecting means.

The control device 146 includes a glass cylinder 30.
Prior to the above processing, the thickness of the resinate paste to be filled in the gap 38, the inner diameter of the needle 118, etc. are set and stored in the RAM, and the end portion is detected during the processing of the glass cylinder 30. An end position signal indicating the position of the end of the gap 38 detected by the device 148 or the position of the end of the resinate paste applied along the end as described later is sent. And that R
Based on the setting data and the end position signal stored in the AM, the motor 64 is driven to rotate the glass cylinder 30 by a predetermined angle in accordance with a program stored in advance in the ROM, thereby predetermined from the end. The tip of the needle 118 is always positioned at a position separated by a predetermined distance. In the present embodiment, the control device 146 corresponds to the movement amount control means.

A method of manufacturing the heating roller 10 using the curved surface printing machine 46 and the paste filling device 48 will be described below. First, the resinate paste for forming the glass cylinder 30 and the resistance heating element layer 34 described above is prepared. As this resinate paste, one having a viscosity of, for example, about 10,000 mPa · s is used by diluting the Au-based resinate paste No. 1 and No. 2 adjusted to the above-mentioned composition with an organic solvent such as terpineol. . On the other hand, the screen 50 on which the resistor pattern is formed is attached to the curved surface printing machine 46 as shown in FIG. 4, and a predetermined amount of the Au-based resinate paste 54 is placed on the upper surface of the screen 50.

In the resistor pattern of the screen 50, the length in the moving direction indicated by the arrow in FIG. 4 has a variation within the tolerance of the outer diameter of the outer peripheral surface of the glass cylinder 30, rather than the circumferential length. It is set to a value slightly smaller than (outer diameter center value-tolerance / 2) x π so that it is always a little shorter regardless. In this embodiment, since the center value of the outer diameter is 20 mm and the tolerance is 0.3 mm as described above, the length of the resistor pattern is 62 mm.

Then, the glass cylinder 30 is attached to the screen 50.
And at a predetermined position as shown in the figure, that is, at a predetermined position, the screen 50 is rotated in the direction of the arrow around the axis and at the same time the screen 50 is moved in the direction of the arrow. The resinate paste is printed on a predetermined resistor pattern with a thickness of, for example, about 6 μm. At this time, since the resistor pattern is shortened as described above, the film 150 formed by printing the Au-based resinate paste 54 as shown in the cross section of FIG.
A gap 38 is formed by the start point and the end point of the resistor pattern.
Occurs. The width of the gap 38 (that is, the circumferential length)
Is the length of the above resistor pattern and the glass cylinder 30.
It is determined from the outer diameter and the tolerance, and since these values are set as described above, the value is in the range of about 0.36 to 1.30 mm as described above.

Then, after drying at about 70 ° C. and firing at a predetermined temperature of, for example, about 600 ° C., a thin film metal is produced from the resinate paste adhered to the outer peripheral surface of the glass cylinder 30, and the gap 38 is formed. The printed portion 40 of the resistance heating element layer 34 formed in a part of the circumferential direction is formed.
In this embodiment, the step of printing and drying the resinate paste 54 by the curved surface printing machine 46 corresponds to the film forming step, and the step of firing to form a thin film metal corresponds to the first firing step. .

Then, the Au-based resinate paste described above is used.
With the same composition as No. 1 and No. 2, the content of Au was reduced to about 70 wt%, respectively, so that the resistance value of the thin-film metal generated by heating was 1. Another Au-based resinate paste, which is about 5 times as much, is diluted with an organic solvent such as terpineol to a viscosity of, for example, about 5000 mPa · s, as described above. Then, the Au-based resinate paste is put into the cylinder 94, and the glass cylinder 30 is fixed to the rotating device 56 as shown in FIG. This glass cylinder 3
The fixing of 0 is performed by operating the handle 74 so that the first
The position of the moving base 76 is adjusted so that the distance between the conical members 70 and 82 is slightly smaller than the length of the glass cylinder 30, and the second moving base 78 is moved to the left in the drawing against the biasing force of a spring (not shown). By pushing back, the interval between the conical members 70 and 82 is widened, the glass cylinder 30 is positioned at a predetermined position between them, and the pushing back of the second moving base 78 is stopped.

Next, the needle 1 of the paste discharge part 84
By rotating the horizontal rotating member 102 by 90 degrees around the screw 100 so that the tip of the glass cylinder 18 faces the end closer to the cylinder portion 86 of the glass cylinder 30, the paste discharge portion 84 and the needle 118 are moved. It is parallel to the axial direction of the glass cylinder 30. Then, by loosening the screw 114 and rotating the holding member 112 in the vertical direction, the paste discharge part 84 is fixed such that its axial center direction forms a predetermined angle with the horizontal plane, for example, about 30 degrees. .

As described above, the control device 146 is activated with the glass cylinder 30 and the paste discharge part 84 fixed, and the outer diameter dimension, axial dimension, etc. of the glass cylinder 30 and the gap 3
When the thickness of the resinate paste to be filled in 8 is set, for example, a program corresponding to the setting is set in the controller 1
By selecting from a plurality of programs stored in advance in the ROM of 46, the motor 138 positions the cylinder portion 86 at the leftmost position in FIG. 5 according to the program, and the motor 64 causes the glass cylinder 30 to move its axis. While being rotated around the center, a gap 38 formed on the outer peripheral surface of the end detection device 148 is formed.
By detecting the end position of the glass cylinder, the end of the glass cylinder is rotated from the top by a preset amount in relation to the inner diameter of the needle 118 and the thickness of the resinate paste applied. 30 is fixed.

Thereafter, the cylinder portion 86 is moved in the left-right direction in FIG. 6 so that the axis of the needle 118 is positioned vertically above the axis of the glass cylinder 30, that is, in FIG. 8 (a). Needle 11 as shown
8 is positioned above the gap 38 such that the axis C thereof is separated from the end portion 152 by a dimension d of about 1/4 of the inner diameter dimension. Then, by moving the cylinder portion 86 downward, as shown in FIG. 8 (b), the tip of the needle 118 of the paste discharging portion 84 is moved in the direction shown by the arrow in FIG. 8 (a) ( That is, when the cylinder portion 86 is moved to the right (in the figure), the cylinder portion 86 faces the downstream side in the moving direction and is pressed by the gap 38 to be bent against the bending elastic force. Then, when a start switch (not shown) is operated, application of the resinate paste into the gap 38 of the glass cylinder 30 is started according to the selected program.

That is, from the pressure air supply device 122,
Constant pressure (eg 1.0 kg / cm ²) Pressurized air
By being supplied, the cash register filled in the cylinder 94
The nate paste is discharged from the tip of the needle 118.
At the same time, the motor 138 is rotated to move the moving part.
By moving the material 142 in the horizontal direction,
The binder portion 86 is, for example, in the right direction in FIG.
Along the 0 axis direction, a predetermined speed (for example, 1 mm / se)
c)). As a result, the needle 11
8 is a gap 38 formed on the outer peripheral surface of the glass cylinder 30.
9 along the gap 38 shown in FIG.
So that the resinate paste 154 is filled. this
At this time, as described above, the axial center of the needle 118 has the gap 38.
By being separated from the end by a distance d,
The ginate paste does not adhere to the printing unit 40 previously formed.
Kana width W_OIt is applied so that ≦ 0.2 mm overlaps.

It should be noted that the above-mentioned moving speed in the axial direction is equal to the clearance 3
The thickness of the resinate paste filled toward 8 after firing is determined to be approximately the same as the thickness of the resistance heating element layer 34 formed by the curved surface printing machine 46. In this embodiment, the needle 118 has the gap 3
8 in a state where the paste ejecting portion 84 faces the glass cylinder 3
0 and the pressurized air is supplied to cause the resinate paste to move to its needle 118.
The process of discharging through corresponds to the paste filling process.

At this time, since the inner diameter of the needle 118 is about 0.3 mm as described above, the resinate paste is applied with a width of about 0.30 to 0.35 mm.
However, as described above, the width of the gap 38 is 0.36 mm or more, and since the width W _O (≦ 0.2) is applied over the previously formed printing portion 40, the entire gap 38 is covered. Resinate paste does not fill. Therefore, when the cylinder portion 86 is moved to the right end of the glass cylinder 30, the motor 64 is rotated to slightly rotate the glass cylinder 30, and the resinate paste is applied to form a newly formed gap. The end of 38 is detected by the end detecting device 148, and the end and the needle 11 are detected in the same manner as in the case of the position setting at the start.
The glass cylinder 30 is fixed at a rotation angle such that the distance from the axis of 8 is the distance d. At the same time, the cylinder portion 86 is returned to the left end position in FIG. 5 at the start of applying the resinate paste, and the cylinder portion 86 is again moved along the axial direction in FIG.
The resinate paste is discharged toward the gap 38 through the needle 118 while being moved in the right direction in FIG.

In this way, the application is continued until the gap 38 is filled with the resinate paste, and the gap 3
When the end portion of No. 8 is no longer detected, the control device 146 determines the end of filling, and, for example, the vertical movement device 130 moves the cylinder portion 86 upward and the needle 1
By separating 18 from the glass cylinder 30,
The application of resinate paste is completed. That is, in the present embodiment, the control device 146 also corresponds to the end determination means. Then, leveling is carried out for a predetermined time as it is, and after a drying step (for example, hot air drying for about 5 minutes and further finish drying at 70 ° C.) is performed under predetermined conditions, baking is performed at 600 ° C., for example. Due to
The resinate paste filled in the gap 38 is metallized to form the filled portion 42, and the resistance heating element layer 34 having a substantially uniform thickness in the circumferential direction is obtained over the entire axial length of the glass cylinder 30. The thickness of the resistance heating element layer 34 in the gap 38 was, for example, 5 μm when dried and about 0.7 μm after firing as described above. In the present embodiment, the step of firing the resinate paste filled in the gap 38 corresponds to the second firing step.

After this, Ag (silver) or Ag-Pd, A
A g-Pt thick film paste is prepared, and for example, by direct printing by the curved surface printing machine 46 or indirect printing by a transfer method, the resistance heating element layer 34 is overlapped with the resistance heating element layer 34 by an axial length of, for example, about 2 mm and has a predetermined thickness. Now, by forming electrode patterns on both ends of the outer peripheral surface of the glass cylinder 30 on which the resistance heating layer 34 is formed, and drying at a predetermined temperature of, for example, about 120 ° C., and baking at about 600 ° C., for example. The electrodes 32, 32 are formed. Then, by further forming the protective film 36 on the resistance heating element layer 34, the heating roller 10 is obtained.

Here, the resistance value distribution and the temperature distribution of the heating roller 10 were evaluated in comparison with the heating roller in which the gap 38 was not coated with resinate paste. As shown in FIG. 10 (a), the resistance distribution is 2 mm apart from the electrodes 32, 32 at both ends of the heating roller 10 by about 10 mm.
The position is divided into 10 in the axial direction, and 10 blocks of B _{1 to} B ₁₀ having a length of about 32 mm are made to flow a constant current along the axial direction to measure the voltage in each block. As shown in (b), about 1 from the gap 38 where the resinate paste is applied by the paste filling device 48.
It was determined by carrying out at four positions at 90 ° intervals in the circumferential direction, including positions (P ₁ ) separated by about mm. The measurement is performed in a state where the protective layer 36 is not formed,
Both terminals of the voltmeter 156 were separated from each other by about 30 mm in one block, and the constant current was supplied from positions separated by about 5 mm from both terminals. Table 2 shows the results when Resinate Paste No. 1 was used.

[0053]

[Table 2]

As is clear from Table 2 above, according to the present embodiment, the variation in the resistance value in the circumferential direction is as small as 2% or less, which shows a good resistance value distribution, whereas in the comparative example, it is as large as about 15%. Shows variability.

The temperature distribution is measured by the heating roller 10
Attach a thermistor to the surface of the
The temperature 10 seconds after the power of 00 W was applied was measured at 90 ° intervals in the circumferential direction including the gap 38 at the central portion in the axial direction.
This was done by measuring points. As a result, in the present example, the maximum temperature variation was 4 ° C., whereas in the comparative example in which the gap 38 was not filled with resinate paste, the temperature above the gap 38 was about 7 compared to the other temperatures.
The temperature dropped to 0 ° C. In addition, although the result is not particularly shown, the same result as above was obtained when the resinate paste No. 2 was used.

That is, according to the present embodiment, the gap 38 is formed by printing the resinate paste on the outer peripheral surface of the glass cylinder 30 by the curved surface printing machine 46 to form the resistance heating layer 34, but the paste filling device 48 is used. While the cylinder portion 86 is moved along the axial direction of the glass cylinder 30, the resinate paste is discharged into the gap 38 through the needle 118, so that the resistance heating element layer 34 previously formed in the gap 38 is formed. The resinate paste is filled so as to have a substantially similar film thickness. Therefore, the resistance heating element layer 34 is formed on the entire outer peripheral surface of the glass cylinder 30 with substantially the same thickness, and the gap 38 does not exist in a part in the circumferential direction. Therefore, as shown in the above evaluation result, the resistance distribution in the circumferential direction of the heating roller 10 becomes substantially uniform, and the temperature unevenness in the circumferential direction is reduced.

Moreover, the width dimension of the gap 38 varies depending on the variation in the outer diameter dimension of the glass cylinder 30, and the resin paste 154 is formed in the gap 38 with a thickness substantially the same as that of the printing portion 40 after firing. Since it is filled, the resistance value distribution in the circumferential direction is substantially uniform regardless of the width dimension. On the other hand, in the conventional technique of reducing the resistance value distribution by controlling the size of the seam (gap or overlap), it is difficult to control the size of the seam due to the variation in the outer diameter size of the glass cylinder 30. It was difficult to make the value distribution sufficiently uniform. That is, according to the present embodiment, a substantially uniform resistance value distribution in the circumferential direction can be obtained regardless of the outer diameter tolerance of the glass cylinder 30.

Since the resinate paste filled in the gap 38 has a low Au content, the resistivity of the metal produced by heating is produced by heating from the film formed by the curved surface printing machine 46. It is made higher than the resistivity of the thin film metal. Therefore, as is clear from Table 2, despite the overlapping portion 44 formed by the printing portion 40 and the filling portion 42 in the vicinity of the gap 38, the resistance value has almost no difference from other portions. Absent. Therefore, the current is not concentrated on the gap 38, and a more uniform temperature distribution can be obtained.
That is, if there is a portion having a low resistance value in the axial direction, current concentrates on that portion and a temperature distribution occurs in the circumferential direction.However, according to the present embodiment, it is formed by a method different from other portions. Since the filling portion 42 has a relatively high resistivity, there is no portion having a low resistance value so that current concentration occurs, and a uniform temperature distribution can be obtained.

Further, the end of the gap 38, that is, the end of the printing section 40 or the applied resinate paste 154.
Is detected by the end detecting device 148, and a distance d that is predetermined based on the relationship between the position of the end and the inner diameter of the needle 118 is detected by the control device 146 corresponding to the movement amount control means. Since the axis of the needle 118 is located at a position separated from the end, the gap 3
If the width of 8 is larger than the inner diameter of the needle 118 and the gap 38 is not filled with the resinate paste 154 by one relative movement in the axial direction, the glass cylinder 30 is rotated and the ends of the gap 38 are sequentially rotated. By repeating the detection and the application of the resinate paste 154, the gap 38 having various width dimensions can be filled with the resinate paste. Moreover, the gap 38 is the glass cylinder 30.
Even when it is not formed parallel to the axis of the cylinder part 86, the end part is detected and the glass cylinder 30 is rotated while the cylinder part 86
Is moved in the axial direction to fill the gap 38 with the resistor paste.

Further, the needle 118 having bending elasticity
However, since the resinate paste is applied by being pressed against the gap 38 and brought into contact with the outer peripheral surface of the glass cylinder 30 in a bent state against the bending elastic force, the straightness of the glass cylinder 30 is poor. Also in this case, the distance between the needle 118 and the outer peripheral surface of the glass cylinder 30 is always kept constant (that is, in a state where they are always in contact), and the resinate paste is applied uniformly in the axial direction.

In this embodiment, since the resistance heating element layer 34 is formed by applying, drying and firing the resinate paste, it is difficult for the wire to break due to thermal stress during use. That is, the resinate is in a liquid or paste form and is extremely fine to the extent that the metal can be chemically bonded to the organic substance, and thus a thin and dense metal structure can be obtained after firing. Further, in the resistance heating element layer 34 obtained from the resinate film, since the metal is bonded at the atomic level, it is difficult to cause a disconnection due to thermal stress during use, and it is possible to use the thin film thickness as described above. Is. When the thick film paste is used as in the prior art, the metal of the resistance heating element layer is only in contact with each other at the particle level by being bonded by the glass component, so that the resistance to thermal stress is It is low and it is difficult to obtain a film thickness of several μm or less.

Next, another embodiment of the present invention will be described. It should be noted that in the following embodiments, detailed description of portions common to the above-described embodiments will be omitted.

A curved surface printing machine 46 is used in the same manner as in the above-described embodiment.
Is used to form a resistance heating element layer 34 having a gap 38 on the outer peripheral surface of the glass cylinder 30, and the paste filling device 48 is used to fill the gap 38 with resinate paste and dry it.
A similar heating roller 10 was produced by firing. The resinate paste used is No. 1 in Table 1 above, and the resinate paste filled in the gap 38 is
It was the same as that used for the curved surface printing machine 46. With respect to this heating roller 10 as well, the resistance value distribution and the temperature distribution were evaluated in the same manner as in the above-described examples, together with the comparative example in which the gap 38 was not filled with the resinate paste. The measurement results are shown in Table 3 below.

[0064]

[Table 3]

As is apparent from Table 3 above, in the present embodiment, the variation in the resistance value in the circumferential direction is as small as about 6%, which shows a good resistance value distribution, whereas in the comparative example, the same as in the case described above. It shows a large variation of about 15%. Also,
Regarding the temperature distribution, the present example shows a maximum temperature difference of about 5 ° C., but the comparative example shows a temperature unevenness of about 70 ° C.

That is, although not as great as the above-mentioned embodiment,
Also in this embodiment, the resistance distribution in the circumferential direction is sufficiently improved, and a substantially uniform temperature distribution in the circumferential direction can be obtained.

In the embodiment described above, the edge detecting device 148 is provided, and the edge detecting device 148 detects the edge of the gap 38 to rotate the glass cylinder 30 by a predetermined angle. Although the gap 38 is filled with the resinate paste 154, the edge detection device 148 does not necessarily have to be used.

For example, the width of the gap 38 is measured separately, and the end of the gap 38 is rotated by a predetermined angle from the vertical center of the axis of the glass cylinder 30, so that the axis of the needle 118 moves from the end. The glass cylinder 30 is fixed to the rotating device 56 so as to be separated by the predetermined distance d. Then, when the control device 146 is activated, the width dimension of the gap 38 is set in addition to the data set in the above-described embodiment, and R
Store in AM. With this configuration, for example, in relation to the ratio between the width dimension of the gap 38 and the inner diameter dimension of the needle 118, each time the movement of the cylinder portion 86 along the entire axial length of the glass cylinder 30 is completed once. The operation of rotating the glass cylinder 30 by a predetermined angle by driving the motor 64 to apply the resinate paste to the gap 38,
By repeating the number of times according to the ratio of the width dimension of the gap 38 to the inner diameter dimension of the needle 118, the gap 38
Can be filled with resinate paste 154.

In this way, when the gap 38 is formed in parallel with the axis of the glass cylinder 30, the end detection device 148 does not perform complicated control and the resin is registered in the gap 38. It is possible to apply a paste.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be carried out in still another mode.

For example, in the above-described embodiment, the printing portion 40 having the gap 38 in the circumferential direction is formed by the curved surface printing machine, but the printing portion 40 is formed with, for example, a similar resistor pattern. It may be formed by a transfer method in which a resistor pattern is formed on the sheet by screen printing using the screen 50 and is transferred to the outer peripheral surface of the glass cylinder 30. That is, the present invention improves the circumferential resistance value distribution by filling the gap 38 with a resistor paste such as resinate paste in the case of a film forming method in which the gap 38 is formed in the circumferential direction. The temperature unevenness is reduced, and the method of forming the printing portion 40 having the gap 38 is as long as the screen 50 on which the resistor pattern having the length in which the gap 38 is formed is formed in the circumferential direction of the glass cylinder 30 is used. The printing may be directly performed on the outer peripheral surface of the glass cylinder 30 or a method such as transfer may be used.

The resistor paste used is not particularly limited as long as it can be screen-printed and can be discharged from a discharge thin tube such as the needle 118 by adjusting the viscosity. For example, a conventional thick film resistor paste may be used. However, the resinate paste is more preferable because the resistance heating element layer 34 to be formed has a thin and dense metallographic structure, a high resistance to thermal stress is obtained, and the film level difference at the joint portion is extremely reduced. .

Further, as a coating method for filling the gap 38 larger than the inner diameter of the needle 118 with the resistor paste such as resinate paste, as shown in the embodiment, the glass cylinder 30 is rotated by a predetermined angle and the cylinder portion is rotated. 86
In addition to repeatedly reciprocating, the axial movement speed of the cylinder portion 86 may be changed according to the width ratio. That is, since the resistor paste is used with a low viscosity so that it can be easily discharged through the needle 118, the gap 38 is formed especially when the moving speed of the needle 118 is slow.
When applied inside, it will spread in the width direction. Therefore, by changing the moving speed of the needle 118 in the axial direction to control the discharge amount per unit length, the gap 38
It is possible to apply the resistor paste with a desired width and thickness therein by a single movement operation of the cylinder portion 86.
In this case, the supporting means does not need to have a rotation function, and the rotation motor 64 is unnecessary.

In the above-described embodiment, the resistor 86 is returned to the coating start position each time the cylinder portion 86 is moved in the axial direction of the glass cylinder 30, and is always moved in the same direction. Although it is configured to apply the paste, for example, when the horizontal rotation member 102 is rotated by a rotation motor or the like that is drive-controlled by the control device 146, it is moved once in the axial direction and then moved. The horizontal rotation member 102 is
It may be configured so that it can be turned to 0 ° and directed toward the other end while discharging the resistor paste.

The length of the resistor pattern formed on the screen 50 (the length in the circumferential direction) is the glass cylinder 3
It is appropriately changed depending on the outer diameter of 0 and the tolerance. For example,
When the tolerance is relatively small, it is possible to make the width dimension of the gap 38 that can occur relatively small by making the length of the resistor pattern relatively long. However, if the films formed in the film forming process overlap,
Since it is impossible to make the resistance value uniform by the paste filling process, it is necessary to always have a dimension in which the gap 38 is generated. As described above, the resistor pattern length ≦ (outer diameter−tolerance / 2) × must be π.

Further, as a method for coping with the variation of the width dimension of the gap 38, in addition to always controlling the coating method by using the needle 118 having the same inner diameter dimension as shown in the embodiment, the needle 118 having different inner diameter dimension is used. It is also possible to prepare a large number of needles and change the needles 118 to be used according to the width dimension of the gap 38.

Further, the printing portion 40 and the gap 3 which are previously formed
Width W of the overlapping portion 44 with the resistor paste applied to No. 8
_O is changed appropriately. However, if the set value of W _O is too small, the resistor paste may not be filled in the entire gap 38 due to misalignment during application.
The thickness is preferably about 0.05 to 0.6 mm, and most preferably set to about 0.2 mm as shown in the examples.

Further, in the embodiment, the case where the resistivity of the resistor paste filled in the gap 38 is about 1.5 times higher than that of the resistor paste fixed to the printing portion 40 and the similar case have been described. However, this resistivity ratio is appropriately set. For example, the resistivity of the material to be filled may be lower than that of the printing portion, or conversely, it may be a value several times higher. However, if the resistivity is lowered, current concentration occurs in the gap 38 portion and temperature unevenness is likely to occur, which is not preferable. When the resistivity is too high, the current value in the gap 38 portion becomes low, but the heat generated in other portions of the resistance heating element layer 34 is also transmitted to the gap 38 portion, so that it is substantially uniform in the circumferential direction. The temperature distribution will be obtained. However, even in this case, a slight temperature unevenness may occur, so that the resistivity of the resistor paste filled in the gap 38 is
The resistivity of the resistor paste fixed to the printing unit 40 is 1.
It is preferably about 0 to 3.0 times, and most preferably about 1.5 times as shown in the examples.

Also, in the embodiment, the cylinder portion 86
Was moved along the axial direction of the glass cylinder 30,
On the contrary, the glass cylinder 30 may be moved in the axial direction. That is, any of the cylinder portion 86 and the glass cylinder 30 may be moved as long as they are relatively moved in a direction parallel to the axial direction of the glass cylinder 30. In addition,
The entire cylinder portion 86 does not necessarily have to be moved relative to each other, and it is sufficient if the needle 118 and the glass cylinder 30 are moved relative to each other.

In the above-described embodiment, the resistor paste is filled in the gap 38 after the resistor paste printed by the curved surface printing machine 46 is fired. However, the printed resistor paste is dried and then fired. The printing portion 40 and the filling portion 42 may be metallized at the same time by previously filling the gap 38 with the resistor paste and then simultaneously firing. In this case, the above co-firing corresponds to the firing step.

Further, in the embodiment, the resistance heating element layer 3 is used.
In order to avoid the reaction between the electrode 4 and the electrode 32, the resistance heating layer 3
The firing of No. 4 and the firing of the electrode 32 were performed separately, but when a material that does not cause a reaction during firing is used for the resistance heating layer 34 and the electrode 32, for example, the resinate paste filled in the gap 38 is used. The firing of the electrode paste and all firings may be performed at the same time.

Further, the film thickness of the resistance heating element layer 34, the distribution of resistance values and the like are set appropriately. For example, the resistance value of the whole may be made uniform, or the resistance value of the central portion in the axial direction may be made low or high. In this case, when the resistor paste is filled in the gap 38, the cylinder portion 86 of the glass cylinder 30 and the cylinder portion 86 is related to the axial relative position of the glass cylinder 30 and the cylinder portion 86 according to the resistance value distribution. By increasing or decreasing the moving speed in the axial direction, the discharge amount of the resistor paste per unit length in the axial direction of the glass cylinder 30 is controlled, and the resistance value distribution in the circumferential direction in the entire range in the axial direction is controlled. It is almost uniform.

Further, in the embodiment, the case where the present invention is applied to the production of the toner fixing heating roller 10 has been described, but the present invention is various in which the resistance heating element layer is provided on the cylindrical outer peripheral surface. Can be applied to the heating roller.

Although not illustrated one by one, the present invention can be modified in various ways without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a structure of a toner fixing unit of a copying machine or the like in which a heating roller manufactured by a manufacturing method according to an embodiment of the present invention is used.

FIG. 2 is a diagram showing a structure of a heating roller of FIG.

FIG. 3 is a view showing a cross section perpendicular to the axial direction of the heating roller of FIG.

FIG. 4 is a diagram schematically showing the configuration of a curved surface printing press used in the manufacturing method of the embodiment of the present invention.

FIG. 5 is a diagram showing a structure of a paste filling device according to an embodiment of the present invention.

FIG. 6 is a diagram showing a right side surface of the paste filling device of FIG. 5;

7 is a diagram showing a cross section perpendicular to the axis of a glass cylinder having a printing portion formed by using the curved surface printing machine shown in FIG.

8A and 8B are views for explaining the positional relationship between the needle and the gap, in which FIG. 8A shows a state seen from above the gap, and FIG. 8B shows a state seen from below in FIG. 8A.

9 is a diagram showing a state in which the resinate paste is filled in the gap using the paste filling device shown in FIG.
It is a figure corresponding to FIG.

FIG. 10 is a diagram illustrating a method of measuring a resistance value,
(a) is a figure explaining the measurement position of an axial direction, (b) is a figure explaining the measurement position of a circumferential direction, respectively.

[Explanation of symbols]

10: Heating roller 30: Glass cylinder (electrically insulating substrate) 34: Resistance heating element layer 38: Gap 40: Printing part (film or thin film metal formed from film) 46: Curved surface printing machine 48: Paste filling device 50: Screen 56: Rotating device (supporting device) 86: Cylinder part (paste discharging device) 118: Needle (discharging thin tube) {138: Motor, 140: Moving rail, 142: Moving member} (Axial direction driving device)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tatsuo Kono No. 1-36 No. 3 Noritake Shinmachi, Nishi-ku, Nagoya-shi, Aichi Noritake Company Limited

Claims (3)

[Claims] 1. A method of manufacturing a heating roller comprising a resistance heating element layer on an outer peripheral surface of an electrically insulating base having a cylindrical outer peripheral surface, the outer periphery of the electrically insulating base being screen-printed. A film forming step of forming a film on which a resistor paste is fixed so that a gap of a predetermined width is formed on the surface in the circumferential direction; and a tip portion of the discharge thin tube of a paste discharge device having a discharge thin tube, By discharging the resistor paste through the discharge capillaries while relatively moving in the direction parallel to the axial direction of the electrically insulating substrate on the gap, the resistor paste is formed in the gap with a thickness substantially similar to that of the film. And a firing step of producing a thin film metal by firing the resistor paste filled in the film and the gap,
A method of manufacturing a heating roller, comprising: 2. A method of manufacturing a heating roller comprising a resistance heating element layer on an outer peripheral surface of an electrically insulating base having a cylindrical outer peripheral surface, the outer periphery of the electrically insulating base being screen printed. A film forming step of forming a film on which a resistor paste is fixed so that a gap having a predetermined width in the circumferential direction is formed on the surface, and firing the film to form the gap having the predetermined width in the circumferential direction. A first firing step for producing a thin film metal having the same, and a tip portion of the discharge thin tube of a paste discharge device equipped with a discharge thin tube, while relatively moving in the direction parallel to the axial direction of the electrically insulating substrate on the gap A paste filling step of filling the gap with the resistor paste to have a thickness after firing that is substantially the same as the thin film metal by discharging the resistor paste through the discharge thin tube; Resistor By firing the paste method for producing a heating roller, characterized in that a second firing step of generating a thin film metal, including. 3. A heating roller manufacturing apparatus comprising a resistance heating layer on the outer peripheral surface of an electrically insulating substrate having a cylindrical outer peripheral surface, wherein a gap is provided in a part of the circumferential direction. Supporting means for supporting the electrically insulating substrate having a film formed by fixing the resistor paste on the outer peripheral surface so that the gap is located on the upper side; An apparatus for manufacturing a heating roller, comprising: a paste ejecting device for ejecting onto the outer peripheral surface of the substrate; and an axial driving means for relatively moving the paste ejecting device in a direction parallel to the axial direction of the electrically insulating substrate. .