JPH09114305A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the life of a heating roller by preventing occurrence of damage of the heating roller by preventing at least two out of a separating pawl, a cleaning pad and a thermistor from being brought into contact with the heating roller at a standby time. SOLUTION: The separating pawl 4, the cleaning pad 7 and the thermistor 9 are supported together by a supporting member 18, and the supporting member 18 is turnably pivotally supported by a fixing supporting member 11 while being pressed on the side of the heating roller 1 by a torsion spring 19. Then, the supporting member 18 is turned together with the separating pawl 4 by actuating a solenoid 13 through a controller 15 only when a heater 3 is actuated, so that the separating pawl 4, the cleaning pad 7 and the thermistor 9 are brought into contact with the heating roller 1. Thus, the separating pawl 4, the cleaning pad 7 and the thermistor 9 are brought into contact with the heating roller 1 only when the heater 3 is actuated, and are separated at other time (standby time) so that solid toner is prevented from being stuck to the heating roller 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device of an electrostatic recording device applicable to a fax machine, a copying machine, a printer and the like.

[0002]

2. Description of the Related Art A conventional fixing device is as shown in FIG. That is, in FIG. 7, the heating roller (fixing roller) 1
The sheet is fed between the pressure roller 2 and the pressure roller 2 to fix the solidified toner. The heating roller 1 is warmed by the heater 3, and the separation claw 4 is attached to and installed on the heating roller 1 side while being biased to the separation claw support member 5 by the torsion spring 6 toward the heating roller 1 side. . A cleaning pad 7 is attached to and installed on a cleaning pad support member 8 on the heating roller 1 side. Further, a thermistor 9 is attached to and installed on the thermistor support member 10 on the heating roller 1 side. Reference numeral 11 in the figure denotes a fixing support member. Here, the separation claw 4, the cleaning pad 7, and the thermistor 9 are all installed in constant contact with the heating roller 1.

[0003]

However, as in the prior art, the heating roller 1 is provided with the separating claw 4, the cleaning pad 7,
When the thermistor 9 and the like are in constant contact with each other, the solidified toner is likely to adhere to the heating roller 1 and the heating roller 1
There is a problem that scratches and the like are likely to occur. The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent the occurrence of scratches due to the adhesion of solidified toner on a heating roller.

[0004]

In order to achieve the above object, the present invention is a fixing device of an electrostatic recording apparatus in which a heating roller is provided with a separating claw, a cleaning pad, and a thermistor. A supporting member for supporting both of them with respect to the heating roller so that they can be contacted and separated from each other, a solenoid for controlling the contact and separation of the separation claw and the cleaning pad, and a sensor for detecting that the paper is passing through the heating roller. And a control device for operating the solenoid so that the separation claw and the cleaning pad are brought into contact with the heating roller only when the sheet is passing through the heating roller based on a signal from the sensor. It is a thing.

Further, in a fixing device of an electrostatic recording apparatus in which a separating claw, a cleaning pad and a thermistor are installed on a heating roller, both the cleaning pad and the thermistor are supported together so that they can be brought into contact with and separated from the heating roller. A support member, a solenoid for controlling contact and separation between the cleaning pad and the thermistor, and a control device for operating the solenoid so that the cleaning pad and the thermistor are brought into contact with the heating roller only when the heater of the heating roller is operating. It is characterized by having.

Further, in a fixing device of an electrostatic recording apparatus in which a separating claw, a cleaning pad, and a thermistor are installed on a heating roller, the separating claw, the cleaning pad, and the thermistor are brought into contact with the heating roller together. A support member that supports separation, a solenoid that controls contact and separation of the separation claw, the cleaning pad, and the thermistor, and the separation claw, cleaning pad, and thermistor contact the heating roller only when the heater of the heating roller is operating. And a control device for operating the solenoid to operate the solenoid.

With the above arrangement, the separating claw, the cleaning pad and the thermistor come into contact with the heating roller only when the sheet is being conveyed or the heating roller is operating (during copying). If not (at the time of standby), at least two of the three do not contact the heating roller, so that the solidified toner is prevented from adhering to the heating roller as much as possible.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view of an embodiment according to the present invention, FIG. 2 is a front view of the same main portion, FIG. 3 is a front view of a second embodiment of the present invention, and FIG. FIG. 5 is a front view of the third embodiment according to the present invention, and FIG. 6 is a front explanatory view of the same main portion.

In the figure, the same components as those in the prior art are designated by the same reference numerals, and a duplicate description will be omitted.
In FIG. 1, the separation claw 4 and the cleaning pad 7 are both supported together by a support member 12, and the support member 12 is attached to the fixing support member 11 by a torsion spring 19 and heat roller 1.
It is pivotally supported while being biased to the side.

A sensor 14 for detecting the conveyance of the paper 16 is provided on the side of the sheet 16, and a solenoid 13 is provided on the side of the separating claw 4. Further, a control device 15 that operates the solenoid 13 based on a signal from the sensor 14 is installed.

In the first embodiment having such a structure,
When the sheet is conveyed, the sensor 14 detects it. Then, the control device 15 receiving the signal operates the solenoid 13. When the solenoid 13 operates, the separation claw 4 moves and the support member 12 rotates, whereby both the separation claw 4 and the cleaning pad 7 separate from the heating roller 1 (see FIG. 2). In this embodiment, the thermistor 9 is always in contact with the heating roller 1.

In the first embodiment, the separating claw 4 and the cleaning pad 7 are in contact with the heating roller 1 only while the paper 16 is being conveyed, and are apart from the heating roller 1 at other times (standby). Adhesion of toner to the heating roller 1 is suppressed.

In the second embodiment shown in FIGS. 3 and 4,
Both the cleaning pad 7 and the thermistor 9 are supported together by a support member 17, and the support member 1
7 is rotatably supported by the fixing support member 11 while being biased toward the heating roller 1 by a torsion spring 19. Then, only when the heater 3 is operating, the solenoid 13 is operated via the control device 15 to rotate the support member 17,
Both the cleaning pad 7 and the thermistor 9 are separated from the heating roller 1. In this embodiment, the separation claw 4 is always in contact with the heating roller 1.

In the second embodiment, the cleaning pad 7 and the thermistor 9 are provided only when the heater 3 is operating.
Is in contact with the heating roller 1 and is separated at other times (during standby), so that the solidified toner is prevented from adhering to the heating roller 1.

In the third embodiment shown in FIGS. 5 and 6,
The separating claw 4, the cleaning pad 7, and the thermistor 9 are supported together by the support member 18, and the support member 18 is rotated by the torsion spring 19 toward the fixing support member 11 while being urged toward the heating roller 1. Be pivoted as possible. Then, only when the heater 3 is operating, the solenoid 13 is operated via the control device 15 to rotate the supporting member 18 together with the separating claw 4 to heat the separating claw 4, the cleaning pad 7, and the thermistor 9. Separate from roller 1.

In the third embodiment, the separating claw 4, the cleaning pad 7, and the thermistor 9 contact the heating roller 1 only when the heater 3 is operating, and they are separated at other times (standby). Therefore, the solidified toner is prevented from adhering to the heating roller 1.

[0017]

As described above, according to the present invention, at least two of the separating claw, the cleaning pad, and the thermistor do not come into contact with the heating roller in the standby state. Can be prevented as much as possible, which can prevent the heating roller from being damaged. In addition, this makes it possible to extend the life of the heating roller.

According to the first aspect of the invention, it is possible to prevent the separation claw and the cleaning pad from being worn and to extend their life.

According to the second aspect of the present invention, it is possible to prevent the cleaning pad and the thermistor from being worn and to extend their life.

Further, according to the third aspect of the present invention,
The separation claw, the cleaning pad and the thermistor can be prevented from being worn out and their life can be extended.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment according to the present invention.

FIG. 2 is likewise a front explanatory view of a main part.

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

FIG. 4 is a front explanatory view of the same main portion.

FIG. 5 is a front view of a third embodiment according to the present invention.

FIG. 6 is likewise a front explanatory view of the main part.

FIG. 7 is a front view of a conventional technique.

[Explanation of symbols]

 1 Heating Roller 4 Separation Claw 7 Cleaning Pad 9 Thermistor 12, 17, 18 Supporting Member 13 Solenoid 14 Sensor 15 Controller 16 Paper

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[Procedure amendment]

[Submission date] March 5, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

[Fig. 2]

FIG. 4

FIG. 6

FIG.

[Figure 3]

[Figure 5]

FIG. 7

Claims (3)

[Claims] 1. In a fixing device of an electrostatic recording device in which a separation claw, a cleaning pad, and a thermistor are installed on a heating roller, both the separation claw and the cleaning pad are supported together so that they can be brought into contact with and separated from the heating roller. Support member, a solenoid that controls contact and separation between the separation claw and the cleaning pad, a sensor that detects that the paper is passing through the heating roller, and the paper passes through the heating roller based on a signal from this sensor. A fixing device comprising: a control device that operates the solenoid so that the separation claw and the cleaning pad are brought into contact with the heating roller only when the fixing claw is operating. 2. In a fixing device of an electrostatic recording device in which a separating claw, a cleaning pad, and a thermistor are installed on a heating roller, both the cleaning pad and the thermistor are supported together so that they can be brought into contact with and separated from the heating roller. A support member, a solenoid for controlling contact and separation between the cleaning pad and the thermistor, and a control device for operating the solenoid so that the cleaning pad and the thermistor are brought into contact with the heating roller only when the heater of the heating roller is operating. A fixing device comprising: 3. In a fixing device of an electrostatic recording apparatus in which a heating roller has a separating claw, a cleaning pad, and a thermistor, the separating claw, the cleaning pad, and the thermistor are brought into contact with the heating roller together. A support member that supports separation, a solenoid that controls contact and separation of the separation claw, the cleaning pad, and the thermistor, and the separation claw, cleaning pad, and thermistor contact the heating roller only when the heater of the heating roller is operating. And a control device for operating the solenoid so that the fixing device operates.