CN104950649B - Image processing system - Google Patents

Image processing system Download PDF

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Publication number
CN104950649B
CN104950649B CN201510133959.7A CN201510133959A CN104950649B CN 104950649 B CN104950649 B CN 104950649B CN 201510133959 A CN201510133959 A CN 201510133959A CN 104950649 B CN104950649 B CN 104950649B
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China
Prior art keywords
voltage
pressure
applying unit
heating component
recording materials
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CN201510133959.7A
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Chinese (zh)
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CN104950649A (en
Inventor
大西隆弘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Finetech Nisca Inc
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Canon Finetech Nisca Inc
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Filing date
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Priority claimed from JP2015059000A external-priority patent/JP6226336B2/en
Application filed by Canon Finetech Nisca Inc filed Critical Canon Finetech Nisca Inc
Priority to CN201810003207.2A priority Critical patent/CN108051989A/en
Publication of CN104950649A publication Critical patent/CN104950649A/en
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Publication of CN104950649B publication Critical patent/CN104950649B/en
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/20Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00Apparatus for electrophotographic processes
    • G03G2215/20Details of the fixing device or porcess
    • G03G2215/2003Structural features of the fixing device
    • G03G2215/2016Heating belt
    • G03G2215/2035Heating belt the fixing nip having a stationary belt support member opposing a pressure member

Abstract

The present invention relates to a kind of image processing system, possess:Heater block, for being heated to the recording materials formed with unfixed toner image;Pressure-producing part, nip portion is formed between the heater block and pressure-producing part, apply pressure in the nip portion, so that the recording materials are crimped onto the heater block;And control unit, in the case of the recording materials are not present in the nip portion, voltage is applied to the heater block, so that the pressure-producing part top layer to be de-energized, the voltage has the opposite polarity polarity of surface potential and the voltage of defined magnitude of voltage with the powered pressure-producing part, and by the voltage, do not discharged between the hole portion on pressure-producing part top layer and heater block.

Description

Image processing system
Technical field
The present invention relates to the image processing system for possessing the fixing device for making toner image be fixed on recording materials.
Background technology
In the past, in using image processing systems such as the duplicator of electrophotographic system, printers, as transferring There is the unit for implementing fixing processing on the recording materials of toner image, possess the fixing device using the system that is thermally fixed.This is fixed Image device possess the fixing film along the film guiding piece rotation of arc-shaped, arrange on the inside of fixing film and across fixing film to record The elastic layers such as the elastomeric material that heating source that material is heated and being covered with pitch tube secures in core bar plus Pressure roller.
In fixing device, rotatably support fixing film film guiding piece by the elastomeric elements such as coil spring and by Exerted a force to backer roll side, so as to which fixing film is crimped into backer roll, and unfixing toner is fixed on recording materials, lead to Crossing makes the recording materials pass through by crimping the fusing nip portion formed to be heated and be pressurizeed to recording materials, so as at this Unfixing toner has been transferred on recording materials.
Under the environment of the low drying of humidity, when recording materials are sent to fixing device, pass through the record material of transmission Material is charged by friction with backer roll, and it is negative polarity that backer roll top layer is little by little powered, adjusts the negative charging on recording materials Toner is attached to the electrostatic displacement of fixing film side.In order to suppress the powered caused electrostatic displacement of the negative polarity of backer roll, to fixing Film side applies the bias of the negative polarity bigger than the negative voltage of backer roll or the elastomeric material of backer roll is replaced with into conduction material Material is to reduce the internal resistance of backer roll, so as to prevent electrostatic displacement.But accompanying image forms the high speed of speed, production The raw negative polarity carried charge increase of backer roll by the increase of friction belt electricity and the rising of the negative polarity bias value applied The problems such as.
Therefore, in such as Japanese Unexamined Patent Publication 2010-128474 publications, disclose and do not pass through fusing nip in recording materials During portion, apply with the structure with the bias of the high pressure of the opposite polarity polarity of fixing bias.It is anti-by so applying The bias of polarity, electric field is produced in fusing nip portion, with recording materials not by period by powered for negative polarity The insulating barrier on backer roll top layer is de-energized, so preventing because the images such as the powered and caused electrostatic displacement of insulating barrier are bad.
Herein, if transmitting the foreign matters such as staple together with recording materials to fixing device, sometimes in fusing nip portion In form hole in the pitch tube of film-form on backer roll top layer is formed.If the hole of minor diameter, then do not interfere with fixing dynamic Make and fixing device can continue to use, but if in order to carry out backer roll top layer except electricity and the high pressure that applies reversed polarity is inclined Pressure, even the hole of minor diameter then be present, it is also possible to which problem is produced due to the application of high pressure bias.On backer roll top layer In the case of foring hole in the insulating barrier of (pitch tube), the conductive rubber material being grounded via core bar exposes from hole portion.When for It is de-energized and applies to fixing film when being biased with the high pressure of the powered opposite polarity polarity of backer roll, due in hole portion The conductive rubber material of the backer roll of ground connection and the potential difference of fixing film, turn into defined small in hole portion and the distance of fixing film Apart from when, discharged between hole portion and fixing film.In the happening part that discharges as fixing film top layer coating due to Discharge and sustain damage, the toner separation property of coating reduces.Reduced by toner separation property and attached on fixing film surface Toner, the toner being attached to is attached to the recording materials transmitted by fusing nip portion, so as to cause image contamination.
The content of the invention
Therefore, present invention offer is a kind of is carrying out when removing electric of the top layer of the pressure-producing parts such as backer roll, can prevent from being fixed The bad image processing system of image caused by the damage of the heater blocks such as film.
Therefore, representational structure of the invention provides a kind of image processing system, and image is formed on recording materials, wraps Include:Heating component, the recording materials transferred with toner image are heated;Pressure-applying unit, in the heating component and institute State and form nip portion between pressure-applying unit, the recording materials for making to be transmitted are in the nip portion to the heating component pressure Connect;And control assembly, it is in the situation of defined state even in the top layer of the heating component or the pressure-applying unit Under, to the heating component and at least some application voltage of the pressure-applying unit, by the voltage, in the heating component Electric discharge is not produced between the pressure-applying unit.
In the present invention, it is electric in order to carry out removing for pressure-producing part, apply a voltage, by the voltage, in nip portion In the absence of transmission recording materials when, do not produce electric discharge between the abnormal position of heater block and the superficial layer of pressure-producing part, Wherein, apply component from voltage and voltage is applied to the heater block.Thus, for example, even in the top layer as pressure-producing part Insulating barrier in formed hole and lower floor conductive rubber material expose in that case of, can also suppress pressure-producing part and heating Electric discharge between part.
Embodiment is illustrated below by referring to accompanying drawing, so as to which other features of the present invention will be apparent.
Brief description of the drawings
Fig. 1 is the figure of the schematic configuration for the image processing system for showing embodiments of the present invention.
Fig. 2 is the profile of the schematic configuration of the fixing device for the image processing system for showing embodiments of the present invention.
Fig. 3 is the figure of the structure of the control unit for the image processing system for showing embodiments of the present invention.
Fig. 4 is to show the surface potential in the image processing system of embodiments of the present invention by number and backer roll Change figure.
Fig. 5 is to show be applied with fixing film the inclined of positive polarity in the image processing system of embodiments of the present invention Potential difference and roller surface of pressurizeing between fixing film in the case of pressure and pressurization roller surface except piezoelectric voltage relation figure.
Fig. 6 is to show to form hole in the insulating barrier on top layer in the image processing system of embodiments of the present invention In backer roll to fixing film apply positive polarity bias and film bias with pressurization roller surface potential difference and fixing film and backer roll Between the magnitude of current relation figure.
Fig. 7 is to show that the surface potential in backer roll in the image processing system of embodiments of the present invention is powered The figure of the relation of the electric removing effect on the backer roll top layer in the case of being applied with positive polarity to being biased as film during -600V.
Fig. 8 A are to show to be applied with different electricity as film bias in the image processing system of embodiments of the present invention The figure of the rotating speed of backer roll in the case of pressure untill the electric charge -600V on backer roll top layer is removed.Fig. 8 B are to show In the image processing system of embodiments of the present invention as film bias be applied with different voltage in the case of image quality, The table of stand-by time.
Fig. 9 is the flow chart for showing to apply in the image processing system of embodiments of the present invention the action of film bias.
Figure 10 is the stream for showing to apply in the image processing system of the other embodiment of the present invention action of film bias Cheng Tu.
Figure 11 is to show connect the different paper of resistance value in the image processing system of the other embodiment of the present invention Continue the figure of the relation of the sticking potential of the pressurization roller surface in the case of having passed through.
Figure 12 is to show paper resistance and Paper Moisture in the image processing system of the other embodiment of the present invention The figure of relation.
Figure 13 is to show to put in the environment of absolute humidity in the image processing system of the other embodiment of the present invention The figure of the relation of Paper Moisture in the case of putting one day.
Figure 14 is the stream for the application action for showing that film biases in the image processing system of the other embodiment of the present invention Cheng Tu.
Embodiment
Hereinafter, with reference to the accompanying drawings, the image processing system of embodiments of the present invention is illustrated.In addition, show in embodiments Numerical value, the structure condition gone out is referential data, reference configuration, is not the numerical value for limiting the present invention.
<1st embodiment>
(schematic configuration of image processing system)
Fig. 1 is the figure for the schematic configuration for showing image processing system.
As shown in the drawing, by being supplied with the charged roller 2 from the powered voltage with high voltage power supply 1, photoconductor drum 3 (image carrier) is by powered into regulation current potential.Photoconductor drum 3 is exposed by exposure device 4, makes the electricity of photoconductor drum 3 Position is reduced to defined current potential.Then, toner in imaging container 5 is equably placed on imaging sleeve 6, using making current potential The effect of the current potential on photoconductor drum 3 and the difference of the current potential applied to imaging sleeve 6 that reduce, i.e. electric field, has made powered Toner is attached on photoconductor drum 3.The toner image formd on photoconductor drum 3 is transferred to by edge by transfer roll 8 Guiding piece 7 to be sent on the recording materials of transfer area, and recording materials are conveyed to and through being fixed along guiding piece 11 Device 12 is fixing and discharges.The remaining toner for adhering on photoconductor drum 3 and do not complete transfer is scraped by cleaning doctor 9 Reclaimed in cleaner 10.
(structure of fixing device)
Fig. 2 is the profile of the schematic configuration for the fixing device 12 for showing the image processing system shown in Fig. 1.
Fixing device 12 has membrane module 20 and backer roll 21 (pressure-producing part).Membrane module 20 have ceramic heater 19, For fixing film 15 (heater block), film guiding piece 13, T mounting tables 14 and the thermistor heated to recording materials 18 (temperature detection devices).Ceramic heater 19 is with the heater that heating cream has been printed on ceramic substrate and for protecting Heater and the glass coating for ensuring insulating properties, generated heat by implementing the AC electric currents of Electric control to heater supply.
Fixing film 15 is formed by polyimides and is the cylindrical shape of about 70 μm of thickness, and the heat from ceramic heater 19 is high Pass to effect the toner 17 on recording materials 16.Film guiding piece 13 has several ribs in its longitudinal direction, thus exists Suppress the circular motion of auxiliary fixing film 15 while the resistance with fixing film 15.T mounting tables 14 are formed and equably by steel plate Apply plus-pressure.In addition, the thermistor 18 at the back side in ceramic substrate detects temperature, according to its result of detection, control adds Hot device driver element (not shown), carries out the Electric control to ceramic heater 19.
In addition, backer roll 21 has roll shape, can be rotated centered on axle.In addition, 1 × 10 is covered on core bar5 The conductivity silicon rubber (elastic layer) of Ω cm or so specific insulation, and cover thereon about 60 μm of insulation tube (table Layer), to form backer roll 21.By the film guiding piece to be exerted a force by elastomeric elements such as coil springs to the direction of backer roll 21, pass through Defined roll gap pressure, clip the ground of fixing film 15 and ceramic heater 19 is crimped with backer roll 21 and forms 5~8mm fixing roller Gap portion 22.Backer roll 21 is driven in rotation by motor (not shown) etc., makes 15 driven rotation of fixing film, and with being fixed The state that film 15 has been close to, transmission have been directed to the recording materials 16 in fusing nip portion 22.By so by recording materials 16 Fusing nip portion 22 is sent to, using the heat of ceramic heater 19 and the pressure in fusing nip portion 22, on recording materials 16 The unfixed toner 17 transferred carries out fixing processing.Herein, if transmitting the foreign matters such as staple together with recording materials Into fixing device, then hole is formed in the pitch tube of film-form on backer roll top layer is formed in fusing nip portion sometimes.This The state that sample generates hole portion is the specified states on top layer in the present invention.
By the negative polarity for the high voltage power supply 24 being provided with apparatus main body (with toner identical polarity, the 2nd polarity) Bias via protective resistance 26 be input to switching switch 30.And then by the high voltage power supply 25 being provided with apparatus main body The bias of positive polarity (polarity, the 1st polarity) opposite with toner is input to switching switch 30 via protective resistance 27.
When carrying out fixing on recording materials, by switching switch 30 for fixing film 15 via being contacted with fixing film 15 Brush 23 and protective resistance 26 apply and toner identical polarity is the bias of negative polarity.By applying negative polarity when being fixed Film is biased, and in fusing nip portion 22, the electric field acted on from fixing film 15 to the direction of backer roll 21 is produced to toner.By This, produces the power that the image of unfixed toner 17 is pressed into the direction on recording materials 16, prevents electrostatic displacement.
On the other hand, will be with toner 17 by switching switch 30 during recording materials are not by fusing nip portion Opposite polarity is that the bias of positive polarity is applied to fixing film 15 via protective resistance 27 and brush 23.Then, it is negatively charged plus The electric charge on the top layer of pressure roller 21 is removed.In addition, recording materials not by during the non-through mistake in fusing nip portion 22 (at least without During the toner image of recording materials) film that applies the polarity opposite with toner 17 biases.Therefore, backer roll 21 is being removed The change of the polarity of the bias applied during the electric charge on surface will not directly make to the unfixed toner 17 on recording materials 16 Into influence.
In addition, in the present embodiment, switch by using switching switch 30 between high voltage power supply 24 and high voltage power supply 25 Power supply come change to fixing film 15 apply voltage polarity, but as long as the bias of two polarity can be applied, can also be then Other method.
In addition, high voltage power supply 24,25, brush 23 and switching switch 30 form the voltage application group as voltage applying unit Part.
(structure of control unit)
Fig. 3 is the figure for showing to switch over the structure of the control unit of the action of switching switch 30 etc..As shown in the drawing, control Portion, which has, to be performed the CPU400 of processing according to program, stores program performed by CPU400, the ROM401 of data and conduct It is used as the RAM402 of the memory area of workspace etc..And then CPU400 switchs 30, height via I/O interfaces 403 with switching When voltage source 24,25, backer roll drive motor 50, recording materials detection sensor 60, environment detection sensor 70 and measurement Between the grade image processing system of timer 80 each portion connection.
(by number and the surface potential of backer roll)
Fig. 4 is the figure for the passage by number and the surface potential of backer roll 21 for showing the middle resistance value under low moisture environments Shape.
As shown in the drawing, incident record material 16 is increased by the number in fusing nip portion 22, due to the He of recording materials 16 The friction of backer roll 21 or the influence for preventing the film of electrostatic displacement from biasing, the surface of backer roll 21 are by gradually powered Negative polarity (powered polarity).
If recording materials 16 by number be more than about 200, understand backer roll 21 surface-potential stabilization about- 600V or so.If the surface potential of backer roll 21 becomes big to negative polarity, electronegative unfixed toner is easily from note Record material 16 is electrically attached to fixing film 15, easily shifts.
(the removing piezoelectric voltage of the surface of backer roll 21)
Next, Fig. 5 be show fixing film 15 in the case where being applied with the bias of positive polarity to fixing film 15 with plus Potential difference and the surface of backer roll 21 between the surface of pressure roller 21 except piezoelectric voltage relation figure.
As shown in the drawing, in the case that the potential difference between the surface of fixing film 15 and backer roll 21 is about 450V, nothing Method removes the current potential on the surface of (neutralisation) backer roll 21.But for example, if increase film bias positive polarity, will be with backer roll 21 Surface between potential difference be expanded to about 1500V, then understand the current potential on the surface of backer roll 21 can be removed into about 790V.By If this understands the positive polarity of increase film bias, the effect for removing the electric charge on the surface of backer roll 21 becomes big.
(magnitude of current between fixing film and backer roll)
Fig. 6 is to apply the inclined of positive polarity to fixing film 15 in the backer roll 21 for showing to form hole in the insulating barrier on top layer Pressure, the figure of the relation of the magnitude of current between the potential difference and fixing film 15 and backer roll 21 on fixing film 15 and the surface of backer roll 21 Shape.
As shown in the drawing, if the potential difference on fixing film 15 and the surface of backer roll 21 is about 500V, fixing film 15 with The magnitude of current flowed through between backer roll 21 is about 1 μ A.In addition, if the potential difference on fixing film 15 and the surface of backer roll 21 is about 1000V, then the magnitude of current is about 2 μ A.And then if the potential difference on fixing film 15 and the surface of backer roll 21 is about 1050V, electric current Amount is about 3 μ A.But if the potential difference on fixing film 15 and the surface of backer roll 21 is about 1200V potential difference, the magnitude of current into It is about 10 μ A.According to as a result, understanding that if the potential difference on fixing film 15 and the surface of backer roll 21 is more than about 1000V, fixed Discharged between shadow film 15 and the surface of backer roll 21.Therefore, in order to prevent the electric discharge between fixing film 15 and the surface of backer roll 21, need The potential difference between fixing film 15 and the surface of backer roll 21 is set to be equal to or less than about 1000V.
(electric removing effect for being applied with the situation of film bias)
Fig. 7 is to show that the surface potential in backer roll 21 is applied with positive polarity by powered extremely -600V and conduct film bias In the case of backer roll top layer electric removing effect relation figure.
As shown in the drawing, in order to about -600V is de-energized to the top layer of backer roll 21, it is necessary to as film bias apply about+ 800V voltage.But if the electricity of the bias for applying about+800V, fixing film 15 and the surface of backer roll 21 is biased as film Potential difference turns into about 1400V.In this case, as shown in fig. 6, the potential difference between the surface of fixing film 15 and backer roll 21 exceedes About 1000V, and discharged between fixing film 15 and the top layer hole portion of backer roll 21, so as to cause to damage to film top layer.
If the potential difference, such as do not discharged between fixing film 15 and the top layer hole portion of backer roll 21 is applied to as film bias About+400V bias, then the potential difference on fixing film 15 and the surface of backer roll 21 turns into about 1000V, and in fixing film 15 and pressurizes Do not discharged between the top layer hole portion of roller 21.But when film bias is about+400V, only can be by the electricity on the top layer of backer roll 21 Lotus removes about -200V or so, and can not reach skew prevents.
(surface potential that the backer roll of the situation of different magnitudes of voltage is applied with as film bias)
Fig. 8 A are shown in the case where being applied with different voltage as film bias, until by the electricity on the top layer of backer roll 21 The figure of the rotating speed of backer roll 21 untill lotus -600V removals.Fig. 8 B are to show be applied with different voltage as film bias In the case of image quality, the table of stand-by time.
As shown in these figures, when film bias pressure constant is+800V, the top layer of backer roll 21 can be removed in once rotating Electric charge -600V, but discharged being applied between the fixing film 15 of film bias and the top layer hole portion of backer roll 21.It is right due to the electric discharge Fixing film top layer causes to damage, so as to produce image contamination.
In addition, when film bias pressure constant is+400V, in the top layer hole for the fixing film 15 and backer roll 21 for being applied with film bias Do not discharged between portion, but in the time once rotated corresponding to backer roll 21, the electric removing effect on the top layer of backer roll 21 is low, So produce electrostatic displacement.In order to remove the electric charge -600V on the top layer of backer roll 21 to prevent the electrostatic displacement, it is necessary to equivalent to The time of 4 rotations of backer roll 21 before next presswork, it is necessary to set substantial amounts of stand-by time.
Therefore, it is known that in order to be applied with the feelings do not discharged between the fixing film 15 of film bias and the top layer hole portion of backer roll 21 Under condition by the surface of backer roll 21 except electricity, carry out weak reducing the current potential of backer roll 21 except electricity applying low film bias first Afterwards, apply high film to bias lead except electricity.
Herein, when the execution of print job starts, as the preparation before print job, fixing film 15 and backer roll are made 21 difference rotation drivings (pre-rotation), but now pass through between the fixing film 15 of driven rotation and the backer roll 21 of rotation driving It is charged by friction, except electricity to the top layer of the backer roll 21 during 0V passes through fusing nip portion 22 in recording materials 16 before print job Before powered is about -300V, is returned to the powered state of polarity side.Therefore, it is impossible to efficiently apply flexibly except the effect of electricity to 0V Fruit.Then, recording materials 16 in fusing nip portion 22 by, so as to be charged by friction further growth, if contemplate it is for example fixed The recording materials 16 of shadow processing are the situations of about 30 or so, then powered to about -430V, (reference picture 4 passes through number and pressurization The relation of the surface potential of roller).Therefore, electrostatic displacement increases.Therefore, it is necessary to meet ground with the pre-rotation before print job, Carry out backer roll 21 removes electricity.
By performed within the time once rotated equivalent to backer roll 21 it is weak except electricity and it is main except electricity both except electricity, i.e., Make in the case of foring hole portion in the top layer of backer roll 21, electric discharge will not also occur and pressurization roller surface can be removed Electricity, but if implementing both before task except electricity, then the startup time delay of print job.It is if in contrast, in office Implement both after business except electricity, then as described above, by the pressurization except electricity before the backer roll rotation that print job starts Roller is by prewhirling before print job then is charged by friction, so if it is intended to then being implemented to it except electricity after task Two kinds become to waste except electricity, the part life of backer roll for causing to drive except electricity etc. shortens.
Therefore, in the present embodiment, the printing prepared in the printing before print job during and after operation terminates During operation, implementation removes electronic work.In the present embodiment, the table of the backer roll 21 after print job terminates not exclusively is carried out Layer removes electricity, and implements the weak of a current potential reduction part on the top layer of backer roll 21 removing electricity.Therefore, herein, ensuing print The carried charge of backer roll 21 before brush task is about -100V or so.
When print job starts, fixing film 15 and backer roll 21 is set to rotate (pre-rotation) as preparation.Now, in order to go Fall the electric charge remained in the top layer of backer roll 21, apply about+600V film bias to fixing film 15.Now, even if being based on Powered+the 600V and backer roll 21 for being added to film bias of pre-rotation top layer carried charge -100V, can also make their difference Within 1000V.So in the case of foring hole portion in the top layer of backer roll 21, in fixing film 15 and pressurization Also do not discharged between roller 21.Thus, not only remove what is remained before the beginning that fixing action is opened in the top layer of backer roll 21 Electric charge, and the electric charge caused by transferring caused be charged by friction of prewhirling based on fixing film 15 and backer roll 21 can also remove in the lump Electricity, and recording materials 16 can be maintained about 0V by the sheet charge of the backer roll 21 before fusing nip portion 22.
Even if by making recording materials 16 by fusing nip portion 22 and the friction subsurface band of backer roll 21 in this condition Electricity, and the quantity for contemplating the recording materials 16 for for example receiving fixing processing is the situation of about 30, then and its quantity of electric charge can press down About -150V is made as, so electrostatic displacement can be prevented.
So, in the 1st embodiment, when the electric charge on the top layer of backer roll 21 is removed into electric, avoiding once applying has The film bias of the voltage to be discharged between fixing film 15 and the top layer hole portion of backer roll 21, so that the application of the electric discharge does not occur Voltage repeatedly applies film bias to be divided into.
Therefore, in the present embodiment, after print job terminates, application+400V is biased as film, by backer roll 21 Top layer removal -200V, so that the top layer of backer roll 21 is reduced to -400V.When ensuing print job starts, for example, printing During the pre-rotation of preparation, application+600V is biased as film, with the current potential on the top layer of backer roll 21 is removed as illustrated in fig. 7- 400V.Thus, in the case where that will not be discharged between the fixing film 15 and the top layer hole portion of backer roll 21 for being applied with film bias, And efficiently the top layer of backer roll 21 can be de-energized, so can also cut down for the unnecessary stand-by time of user.
(control action of film bias)
Fig. 9 is the flow for showing the action for applying film bias in the case where performing the print job of present embodiment Figure.The CPU400 of above-mentioned control unit performs the action of the flow chart.
In the present embodiment, have to be divided into and apply the 1st of film bias at the end of the image after print job is formed Apply (weak except electricity) and apply when ensuing image is formed and started the 2nd of film bias apply (main except electricity) and removing except electricity Power mode.Hereinafter, reference picture 9, the action that backer roll 21 is de-energized except power mode by this is illustrated.
When indicating print job (S1), first, start to print warming-up exercise, as the preparation of fixing processing, start to add The rotation driving (S2) of pressure roller 21.Next, in order to which the residual charge on the top layer to backer roll 21 is de-energized, to fixing film 15 As film bias application+600V (S3).After the transmission of recording materials 16 starts (S4), until recording materials 16 come it is fixing Nip portion 22, carry out this and remove electronic work (S5 "No").That is, the phase of fixing action is being acted to since beginning image formation Between, carry out the bias for backer roll 21 to be removed to electricity and apply.
If detecting recording materials 16 comes fusing nip portion 22 (S5 "Yes"), fixing action starts, to fixing Film 15 is as film bias application -500V, to prevent the toner of negative polarity to be electrically attached to fixing film 15 (S6).
If detecting recording materials 16 has passed through fusing nip portion 22 (passing through end), stopping -500V film bias Apply (S7), be fixed release.
Next, in order to except electricity, apply and add a part for the residual charge on the top layer of backer roll 21 to fixing film 15 The voltage of the powered opposite polarity polarity on the surface of pressure roller 21.Now, apply than described image formed start when in order to except The magnitude of voltage of the small value of absolute value for the magnitude of voltage that electricity is used and applied, (performed weak except electric) for+400V in the present embodiment (S8), the task of a series of fixing processing terminates (S9).The image formed at the end of except it is electric when, application+400V so that Even if due to and the powered maximum -600V (reference picture 4) for being charged by friction of backer roll 21, will not be also fixed by paper Electric discharge is produced between film 15 and the top layer hole portion of backer roll 21.
So, by after the end from fixing action to the backer roll 21 carried out during ensuing print job Sheet charge removes electricity without to 0V, the electricity required time is removed so as to shorten.Then, the sheet charge of remaining backer roll 21 In the fixing of the recording materials 16 of fixing film 15 and backer roll 21 before starting with the fixing action in the print job of next time Nip portion 22 is charged by friction together except electricity (main except electricity) by what is occurred in rotation driving before.Thereby, it is possible to shorten printing Task start before stand-by time, and the sheet charge of the backer roll 21 when fixing action is started is except electricity is to 0V.
As described above, it is divided into applying for the bias that backer roll 21 is de-energized after fixing release and connects down Fixing action when next image is formed is carried out before starting, and makes to apply in after-applied electric the 1st of removing of fixing release Biasing value is less than electric the 2nd of removing applied before the fixing action when ensuing image is formed starts and is biased Value.Thus, in the case that the carried charge of backer roll 21 after just having carried out image and having been formed is big, by reducing except electricity is used Bias value, remain to reliably prevent the electric discharge between fixing film 15 and backer roll 21.Then, by ensuing image shape Make, except electricity is when being biased value more than the described 1st application, reliably to remove powered on backer roll 21 at the beginning of Electric charge, and suppress powered during transmission in fusing nip.
<2nd embodiment>
Illustrate the image processing system of the other embodiment of the present invention.In the 1st embodiment, presswork is shown At the end of and presswork remove electric control for backer roll top layer when starting, but present embodiment is related to except electric control, this The film bias in operation between change paper is formed in image except electric control is related to, to cause voltage within the specific limits little by little Increase, within the range, does not discharge when hole portion is formed at 21 top layer of backer roll, should further relate to apply except electric control to change Film bias.In addition, the basic structure of present embodiment is identical with the 1st embodiment, the explanation repeated is omitted, and is only illustrated The part different from the 1st embodiment.
Figure 10 is the stream for showing the action for applying film bias in the case where performing the print job of present embodiment Cheng Tu.CPU400 performs the action of the flow chart.
As shown in the drawing, after presswork starts, (step in the case of being more than 7 in remaining printing number S1001), apply film and bias -500 (V) (step S1002).Then, until printing number turns into 6 (step S1003), continue Printing operation (step S1004), in the present embodiment, surveyed by being used as the pre-registration sensor of recording materials sensor 60 Measure time of the recording materials by fixing device.Turning into closed mode from the 6th recording materials by pre-registration sensor After rising 0.8 second, make the polarity inversion (step S1005) of film bias.Then ,+400 (V) are being applied with 8 seconds as film bias After clock (step S1006) ,+600 (V) are applied into 12 seconds (step S1007).
On the other hand, in step S1001, in the case where residue printing number is less than 7, biased as film, apply- 500 (V) (step S1008), carry out printing operation (step S1009, S1010), the end of job.
So, perform except electric control, it is inclined that the film changed in image formation operation between paper should be related to except electric control Pressure, to cause voltage to be incrementally increased within the specific limits, within the range, does not send out when hole portion is formed at 21 top layer of backer roll Raw electric discharge, it should further relate to apply the film bias changed except electric control.
That is, in the flow chart shown in Figure 10, for every 6, expand the interval of paper and implement following actions 1) to 4).
1) make film bias-component failure (step S1005).
After 6 recording materials have passed through fixing device, film is biased-component shut-off.
2) in the interval of recording materials activated membrane bias+component (step S1006, step S1007).
Make film bias-component failure after, activated membrane bias+component.
Film is biased+after component (+400V) is applied with 8 seconds, by film bias+component (+600V) applies 12 Second.
3) film bias+component failure is made.
Film bias+component failure when, it is allowed to paper supply.
4) activated membrane bias-component (step S1002).
According to present embodiment, when being continuously formed image, even if it is negative polarity that backer roll top layer is little by little powered, The interval of paper can be utilized, is de-energized in the case where not making backer roll top layer discharge.In the present embodiment, at 6 After having printed, to the interval of paper, implement from backer roll top layer except electricity, but the friction belt electricity on backer roll top layer by The influence of the species of the recording materials of transmission etc., so the timing that the interval of paper is de-energized when image is formed may take Certainly change in the species of recording materials.
And then the 1st embodiment can also be implemented before print job and afterwards, and in the print job 2nd embodiment is implemented to the interval of paper.
<3rd embodiment>
Illustrate the image processing system of the other embodiment of the present invention.Present embodiment is related to the different feelings of absolute humidity Electric control is removed under condition.In addition, the basic structure of present embodiment is similar to the 1st embodiment, the explanation repeated is omitted, only Illustrate the part different from the 1st embodiment.
Figure 11 is the sticking potential of the pressurization roller surface in the case that the paper for showing to make resistance value different has continued through The figure of relation.
It is about 1 × 10 in such as paper resistance11In the case of Ω or so, backer roll surface potential is with -500V or so saturations. Paper resistance is about 1 × 1013In the case of Ω or so, the powered extremely -800V or so of backer roll surface potential.Thus, it is possible to say paper Resistance is bigger, the sticking potential of roller surface of pressurizeing more by it is powered be negative polarity.
Next, Figure 12 is the figure for the relation for showing paper resistance and Paper Moisture.
In the case where Paper Moisture is about 7%, paper resistance is about 1 × 109Ω, in contrast, in Paper Moisture In the case of being about 2%, paper resistance turns into about 1 × 1013Ω.Thus, it is possible to say that Paper Moisture is lower, paper resistance is higher.
Next, Figure 13 is the relation for showing to placed the Paper Moisture of the situation of one day in the environment of absolute humidity Figure.
For example, in the environment of absolute humidity is 0.001 (g/gDA), Paper Moisture turns into 2%, and definitely wet In the environment of degree is 0.019 (g/gDA), Paper Moisture turns into 7%.Thus, it is possible to say that absolute humidity is lower, Paper Moisture It is lower.
From the description above the reasons why, it may be said that according to environment (absolute humidity), backer roll surface potential changes.That is, Absolute humidity is lower, and the current potential on the surface of backer roll 21 is lower.Therefore, in the present embodiment, by with being become according to environment The current potential on the surface of dynamic backer roll 21 correspondingly, changes the voltage for the bias that fixing film is applied to when removing electric from backer roll 21 Value, to prevent the electric discharge between the hole portion on fixing film and backer roll top layer.It will not be influenceed in main body by being heated up in machine Place, the sensor (environment detection unit) of temperature and relative humidity can be detected by setting, to know which provided main body Environment environmental condition, and according to temperature and relative humidity, calculate absolute humidity.The sensor and calculating absolute humidity Calculating part form absolute humidity detection unit.
In the case where the result of calculation of absolute humidity is such as 0.019 (g/gDA), backer roll surface potential be possible to by Powered extremely -500V, and in the case where the result of calculation of absolute humidity is such as 0.001 (g/gDA), backer roll surface potential It is possible to by powered to -800V.As shown in fig. 6, if the potential difference on the surface of fixing film 15 and backer roll 21 is more than about 1000V, then discharged between the surface of fixing film 15 and backer roll 21, so as to cause to damage to film top layer.Accordingly, with respect to from logical Out-of-date negative polarity is for example in the result of calculation of absolute humidity to the initial value of voltage when being switched by the positive polarity of end It is+200V in the case of 0.001 (g/gDA), be in the case of being such as 0.019 (g/gDA) in the result of calculation of absolute humidity+ 500V.So, by reducing the initial value of positive polarity when the result of calculation step-down of absolute humidity and gradually stepping up output work Rate, the damage to film top layer can be suppressed.
Figure 14 is the flow chart of the application action for the film bias for showing present embodiment.Performed by the CPU400 of controller The action of the flow chart.
Confirm the state of absolute humidity, and in the case where absolute humidity is less than setting (such as 0.001 (g/gDA)) (step S1305), in order to, except electricity, make apparatus main body drive (step S1306) from backer roll top layer.Afterwards, equivalent to pressurization About in 400msec of the time once rotated of roller, as film bias application+200V (step S1307).Next, suitable In backer roll once rotate about in 400msec, as film bias application+300V (step S1308).Next, suitable In backer roll once rotate about in 400msec, as film bias application+550V (step S1309).Finally, equivalent to Backer roll once rotate about in 400msec, as film bias application+600V (step S1310).So, little by little improve Film bias on the occasion of.
On the other hand, in the case where absolute humidity is higher than setting (such as 0.001 (g/gDA)), drive apparatus main body Dynamic (step S1311), and equivalent to backer roll once rotate about in 400msec, as film bias application+400V (step S1312).Afterwards, equivalent to backer roll once rotate about in 400msec, as film bias application+600V, so After terminate to remove electronic work (step S1313).Afterwards, biased as film, application -500V (step S1303), and paper passes through (step S1304).
After passage, the state of absolute humidity is confirmed.It is less than setting (such as 0.001 (g/gDA)) in absolute humidity In the case of (step S1316), in order to, except electricity, make apparatus main body drive (step S1317), equivalent to adding from backer roll top layer Pressure roller once rotate about in 400msec, as film bias application+200V (step S1318).Afterwards, equivalent to pressurization Roller once rotate about in 400msec, as film bias application+300V (step S1319).Next, equivalent to pressurization Roller once rotate about in 400msec, as film bias application+550V (step S1320).Finally, equivalent to backer roll Once rotate about in 400msec, as film bias application+600V (step S1321).So, film bias is little by little improved On the occasion of.
On the other hand, in the case where absolute humidity is higher than setting (such as 0.001 (g/gDA)) (step S1316), make Apparatus main body drive (step S1322), equivalent to backer roll once rotate about in 400msec, as film bias apply+ 500V (step S1323).Afterwards, equivalent to backer roll once rotate about in 400msec, as film bias apply+ 600V, then except electrically operated end (step S1324), finally, the polarity (step of the final application of film bias is preserved with positive polarity S1315), the end of job is made.
It is as described above, the positive pole in the case where the voltage applied to fixing film 15 is switched to positive polarity from negative polarity Property initial output value be controlled so as to more low with absolute humidity, make its value smaller, then control the magnitude of voltage of positive polarity so that its Little by little increase.Thereby, it is possible to realization simultaneously except electricity and the porose feelings in backer roll top layer are prevented from backer roll top layer It the damage to fixing film caused by electric discharge under condition, can suppress that image contamination occurs due to electrostatic displacement and electric discharge.
In the above-described embodiment, backer roll 21 does not have hole detection agency.Therefore, regardless of whether formed with hole portion, It is required for the use from product initial, performs the application control for preventing electric discharge.But it is also possible to detection is set to fixing The current value flowed through when film is applied with bias in the core bar of backer roll 21, and the value detected according to this is come the formation of exploration hole Hole detection agency etc..In this case, until being formed before hole, even if biasing height to the film that fixing film applies, also do not send out Raw electric discharge.Before the task of place or task after-applied high bias, so as to implement in a short time from backer roll 21 except electricity, Also, after the formation in hole is detected, implement the film relevant except electricity with the backer roll 21 according to above-mentioned embodiment first Bias applies control.
In addition, in the above-described embodiment, illustrate to have used the situation of the toner of negative polarity, even in using In the case of the toner of positive polarity, also can similarly it apply.In this case, in order to prevent electrostatic displacement, to fixing film 15 apply the voltage of positive polaritys, so according to the value of voltage, the top layer of backer roll 21 by it is little by little powered be positive polarity.Therefore, exist In fusing nip portion 22 in the case of pen material, in a manner of absolute value is gradually uprised, applying to fixing film 15 Voltage with polarity, has hole portion in the top layer of backer roll 21, can also prevent from discharging.
In addition, in the present embodiment, illustrate to have used the fixing film internally as heater block with heating source 15 situation, but not limited to this, even if using forming heater block as the fixing roller in fusing nip portion together with backer roll, Also same effect can be obtained.
And then illustrate to form the situation of hole portion, but not limited to this in the backer roll top layer as pressure-producing part.Root According to present embodiment, even in the fixing device that fixing roller etc. is used as heater block and covering as heater block When forming hole portion so that the conductive component of top layer bottom exposes in the insulation tube on the top layer of fixing roller, it can also prevent from discharging.
In addition, in the present embodiment, as the voltage applied except electricity for backer roll top layer, print job it After-applied 1st voltage, apply the 2nd voltage before print job, but not limited to this constructs.Different magnitudes of voltage can also be made While change more times to avoid electric discharge, that reaches backer roll top layer removes electricity.
Cut off the electricity supply alternatively, it is also possible to save after terminating in print job etc. and be not carried out the weak feelings except electricity Under condition, unenforced situation storage to the RAM402 of control unit etc. before ensuing print job, is deposited according to this Storage, implement weak except electricity and main except electricity.
In addition, in the present embodiment, voltage applies component to being applied with as the fixing film of heater block except electricity Bias, but not limited to this.Can also using using except electricity by the use of bias be applied to the backer roll as pressure-producing part come to pressurization part The structure that part is de-energized.
Although describing the present invention by exemplary embodiment, it is to be understood that, the present invention is not limited to these Exemplary embodiment.The scope of the appended claims should be given broadest explanation, with including all these knots The equivalent and deformation of structure and function.
This application claims Japanese patent application No.2014-061674 (applying date is on March 25th, 2014) and Japan Patent application No.2015-059000 (applying date is on March 23rd, 2015) rights and interests, and by reference and herein simultaneously Enter entire contents.

Claims (16)

1. a kind of image processing system, forms image on recording materials, it is characterised in that including:
Heating component, the recording materials transferred with toner image are heated;
Pressure-applying unit, nip portion is formed between the heating component and the pressure-applying unit, and make the note transmitted Material is recorded to crimp to the heating component in the nip portion;And
Control assembly, it is in inner conductive portion even in the top layer of the pressure-applying unit and reveals from the top layer of the pressure-applying unit In the case of the state gone out, electricity is applied to the pressure-applying unit in the case where the recording materials are not present in the nip portion Pressure, by the voltage, being produced between the heating component and the pressure-applying unit makes the heating component and the pressurization group The potential difference of electric discharge, and the polarity of the voltage and the feelings for being present in the nip portion in the recording materials are not produced between part The opposite polarity of the voltage of the heating component is applied under condition.
2. image processing system according to claim 1, it is characterised in that
Wherein, the control assembly, which applies polarity identical, has the voltage of different magnitudes of voltage, as following voltage, passes through the electricity Pressure, being produced between the heating component and the pressure-applying unit makes not produce between the heating component and the pressure-applying unit The potential difference of electric discharge.
3. image processing system according to claim 1, it is characterised in that
Wherein, the control assembly applies the 1st voltage, and then, application polarity is identical with the 1st voltage and absolute value is more than institute The 2nd voltage of the absolute value of the 1st voltage is stated, the 1st voltage and the 2nd voltage are applied in as following voltage, by this Voltage, being produced between the heating component and the pressure-applying unit makes not produce between the heating component and the pressure-applying unit The potential difference of raw electric discharge.
4. image processing system according to claim 1, it is characterised in that
Wherein, the 1st voltage is applied during the print job end operation of the control assembly after the printing, before printing Print job applies that polarity is identical with the 1st voltage and the 2nd of absolute value more than the absolute value of the 1st voltage during preparing Voltage, the 1st voltage and the 2nd voltage are applied in as following voltage, by the voltage, in the heating component and institute State the potential difference for producing between pressure-applying unit and making not producing electric discharge between the heating component and the pressure-applying unit.
5. image processing system according to claim 1, it is characterised in that
Wherein, the control assembly applies the 1st voltage, then, when the previous recording materials transmitted in print job with In previous recording materials described in interval between subsequent recording materials and the subsequent recording materials either one all When being not present in the nip portion, apply that polarity is identical with the 1st voltage and absolute value more than the 1st voltage absolute value The 2nd voltage, the 1st voltage and the 2nd voltage are applied in as following voltage, by the voltage, in the heating group The potential difference for making not producing electric discharge between the heating component and the pressure-applying unit is produced between part and the pressure-applying unit.
6. the image processing system according to any one of claim 3 to 5, it is characterised in that
Also include the environment detection component of detection environmental condition,
Wherein, the control assembly determines the value of the 1st voltage according to the result of detection of the environment detection component.
7. image processing system according to claim 1, it is characterised in that
Wherein, the control assembly applies following voltage within the defined period, by the voltage, the heating component with The potential difference for making not producing electric discharge between the heating component and the pressure-applying unit is produced between the pressure-applying unit.
8. image processing system according to claim 7, it is characterised in that
Wherein, the pressure-applying unit is rotary part, and
Wherein, the defined period is the period suitable with least 1 rotation of the pressure-applying unit.
9. a kind of image processing system, forms image on recording materials, it is characterised in that including:
Heating component, the recording materials transferred with toner image are heated;
Pressure-applying unit, nip portion is formed between the heating component and the pressure-applying unit, make the record material transmitted Material crimps in the nip portion to the heating component;And
Control assembly, it is in inner conductive portion even in the top layer of the pressure-applying unit and reveals from the top layer of the pressure-applying unit In the case of the state gone out, electricity is applied to the heating component in the case where the recording materials are not present in the nip portion Pressure, by the voltage, being produced between the heating component and the pressure-applying unit makes the heating component and the pressurization group Discharging potential difference, and the polarity of the voltage and the situation for being present in the nip portion in the recording materials are not produced between part Under be applied to the heating component voltage opposite polarity.
10. image processing system according to claim 9, it is characterised in that
Wherein, the control assembly, which applies polarity identical, has the voltage of different magnitudes of voltage, as following voltage, passes through the electricity Pressure, being produced between the heating component and the pressure-applying unit makes not produce between the heating component and the pressure-applying unit The potential difference of electric discharge.
11. image processing system according to claim 9, it is characterised in that
Wherein, the control assembly is after the 1st voltage is applied with, and application polarity is identical with the 1st voltage and absolute value is big In the 2nd voltage of the absolute value of the 1st voltage, the 1st voltage and the 2nd voltage are applied in as following voltage, are led to The voltage is crossed, being produced between the heating component and the pressure-applying unit makes between the heating component and the pressure-applying unit The potential difference of electric discharge is not produced.
12. image processing system according to claim 9, it is characterised in that
Wherein, the 1st voltage is applied during the print job end operation of the control assembly after the printing, before printing Print job applies that polarity is identical with the 1st voltage and the 2nd of absolute value more than the absolute value of the 1st voltage during preparing Voltage, the 1st voltage and the 2nd voltage are applied in as following voltage, by the voltage, in the heating component and institute State the potential difference for producing between pressure-applying unit and making not producing electric discharge between the heating component and the pressure-applying unit.
13. image processing system according to claim 9, it is characterised in that
Wherein, the control assembly applies the 1st voltage, then, when the previous recording materials transmitted in print job with In previous recording materials described in interval between subsequent recording materials and the subsequent recording materials either one all When being not present in the nip portion, apply that polarity is identical with the 1st voltage and absolute value more than the 1st voltage absolute value The 2nd voltage, the 1st voltage and the 2nd voltage are applied in as following voltage, by the voltage, in the heating group The potential difference for making not producing electric discharge between the heating component and the pressure-applying unit is produced between part and the pressure-applying unit.
14. the image processing system according to any one of claim 11 to 13, it is characterised in that
Also include the environment detection component of detection environmental condition,
Wherein, the control assembly determines the value of the 1st voltage according to the result of detection of the environment detection component.
15. image processing system according to claim 9, it is characterised in that
Wherein, the control assembly applies following voltage within the defined period, by the voltage, the heating component with The potential difference for making not producing electric discharge between the heating component and the pressure-applying unit is produced between the pressure-applying unit.
16. image processing system according to claim 15, it is characterised in that
Wherein, the pressure-applying unit is rotary part, and
Wherein, the defined period is the period suitable with least 1 rotation of the pressure-applying unit.
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JP2015059000A JP6226336B2 (en) 2014-03-25 2015-03-23 Image forming apparatus

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JPH0452673A (en) * 1990-06-21 1992-02-20 Canon Inc Fixing device
JP2006047556A (en) * 2004-08-03 2006-02-16 Canon Inc Fixing device for image forming apparatus
JP2010128474A (en) * 2008-12-01 2010-06-10 Canon Inc Image forming apparatus
JP2013117672A (en) * 2011-12-05 2013-06-13 Canon Inc Fixing device

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JP5173237B2 (en) * 2007-04-12 2013-04-03 キヤノン株式会社 Image forming apparatus

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JPH0452673A (en) * 1990-06-21 1992-02-20 Canon Inc Fixing device
JP2006047556A (en) * 2004-08-03 2006-02-16 Canon Inc Fixing device for image forming apparatus
JP2010128474A (en) * 2008-12-01 2010-06-10 Canon Inc Image forming apparatus
JP2013117672A (en) * 2011-12-05 2013-06-13 Canon Inc Fixing device

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