CN104133354B - Charging apparatus - Google Patents
Charging apparatus Download PDFInfo
- Publication number
- CN104133354B CN104133354B CN201410370546.6A CN201410370546A CN104133354B CN 104133354 B CN104133354 B CN 104133354B CN 201410370546 A CN201410370546 A CN 201410370546A CN 104133354 B CN104133354 B CN 104133354B
- Authority
- CN
- China
- Prior art keywords
- shield
- charging device
- photosensitive
- charger
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
As a shutter for closing an aperture of a corona charging unit, preferably, a sheet-shaped member is employed to avoid damaging a photoreceptor which likely comes in contact therewith. Thus, a structure wherein a shutter, the sheet shape of which is regulated by a regulating member, is positioned in a space between the corona charging unit and the photoreceptor is devised. In this structure, however, one end of the shutter under regulation becomes worn due to contact with the corona charging unit, so that the aperture cannot be adequately opened and closed. A protecting member protecting the shutter is provided at the end of the shutter on the side wherein the regulating member is located.
Description
The application is that international application no filed in 9 days March in 2010 is PCT/JP2010/053844, Chinese Application No.
201080035098.4, the divisional application of the application of entitled " charging device ".
Technical field
The present invention relates to a kind of charging used in such as imaging device of photocopier, printer or facsimile machine etc
Device.
Background technology
In electrophotographic image forming, on the photosensitive-member for having charged toner image is formed.Photosensitive-member is filled
The device of electricity is for example, using the corona charging device of corona discharge.Due to corona charging device using corona discharge come to photosensitive-member
Charge, charger generates discharging product, such as ozone (O3) and nitrogen oxides (NOx) etc.
When the discharging product that corona discharge is generated adheres to photosensitive-member, the dampness in these product absorption airs, from
And reduce sheet resistance.Especially, in high humidity environment, the electrostatic latent image based on image information can not effectively be formed in
It has been stained with the part of discharging product (this problem is referred to as " image disappearance ").
A kind of construction is patent document 1 discloses that, the wherein opening of corona charging device is covered with shield and closed by it, with
Discharging product is prevented to be deposited on photosensitive-member during non-imaged.Specifically, disclose wherein shield to move so as to along corona
The construction that the longitudinal direction of charger is opened or closed.In order to prevent " image disappearance ", have a kind of heating photosensitive-member in case
Only discharging product absorbs a kind of method of the method and polishing photosensitive-member of dampness to remove discharging product.With these method phases
Than, it is that the construction of corona charging device setting shield it is advantageous that, reduce the energy (saving energy) needed for heating and reduce
Photosensitive-member polished amount is extending life-span of photosensitive-member.
Reference listing
Patent documentation
PTL 1：Japanese Patent Laid-Open the 2008-046297th.
The content of the invention
Technical problem
Because corona charging device is placed near photosensitive-member surface, therefore have to for shield to place therebetween narrow
In seam.If in order to shield is used into hard shield so that high accuracy is placed in slit, contacted with photosensitive-member in shield
When, shield can damage photosensitive-member.Therefore, hard shield is bad.If however, using with relative Low rigidity and hardly
The sheet shield of photosensitive-member can be damaged, then can relax in sheet material near middle along the longitudinal direction.Adversely, pine
Part of relaxing contacts with photosensitive-member.
Inventor has found after being studied, for the management and control part energy of the end setting management and control sheet form of shield
It is enough to allow that shield is placed in the space between corona charging device and photosensitive-member.Additionally, inventor has found, preferably use
The sheet shield of adhesive-bonded fabric manufacture, so as to prevent photosensitive-member from deteriorating when shield contacts with photosensitive-member.
However, the sheet part wearability of such as adhesive-bonded fabric etc is low, and its inferior position is, the sheet part
Surface become when rubbing against such as grid electrode abrasion.Especially, weight is subject to by the sheet material end of management and control part management and control
Friction load.Particularly with shield made by adhesive-bonded fabric or the like, when shield surface abrasion, fiber life floss (deformation) and
Come off (diverging).Therefore, when repeating to open and close shield, it is impossible to be enough suitably carried out the opening and closing campaign of shield.
It is an object of the present invention to prevent shield from wearing and tearing.Therefore, it is an object of the present invention to provide one
Charging device is planted, the charging device allows the opening and closing operation for being suitably carried out shield.
Other objects of the present invention will become readily apparent from from explanation referring to the drawings.
The solution of problem
The present invention provides a kind of charging device, and the charging device includes corona charging device, and the corona charging device includes grid
Electrode, the corona charging device is configured to charge photosensitive-member；Sheet shield, the sheet shield is configured to along longitudinal direction
Direction opens and closes the opening of the corona charging device；Winder, the winder is configured to keeping the one of the shield
The shield is wound while individual end；The management and control part being placed on the other end of the shield, the management and control part is by structure
Cause the shape of shield described in management and control so that compare the two ends of the shield towards the electricity in shield middle part in transverse direction
Dizzy charger is fartherly prominent；And guard block, the guard block is placed on the surface for facing grid electrode of the shield,
The guard block is configured to protect by the shield of management and control part management and control.
The advantageous effects of invention
According to the present invention, prevent shield from being worn and torn.Opening and closing therefore, it is possible to be suitably carried out shield are operated.
Description of the drawings
Fig. 1 is the one of the charger shield of the opening for being configured to and opening and closing corona charging device of the invention
The perspective view of individual end.
Fig. 2 is the schematic diagram of the schematic configuration for explaining imaging device.
Fig. 3 includes being shown in which the schematic diagram of the state that charger shield opens corona charging device opening.
Fig. 4 includes showing the schematic diagram of the state that charger shield closes corona charging device opening.
Fig. 5 includes showing the schematic diagram of the opening and closing mechanism for opening and closing charger shield.
Fig. 6 includes the schematic diagram of the details of the winder unit for explaining charger shield.
Fig. 7 includes explaining is used for management and control shield shape so that the schematic diagram of the management and control part of shield bending.
Specific embodiment
[embodiment 1]
The unitary construction of imaging device will be introduced with reference first to Fig. 2.Then charging device will in detail be introduced.According to this reality
The imaging device for applying example is using the laser beam printer of electrophotography.
§ 1. { unitary construction of imaging device }
With reference to Fig. 2, charging device 2, exposure device 3, electric potential measuring device 7, developing unit 4, transfer device 5, sanitizer cartridge
Put 8 and optics electric discharge device 9 along the direction of rotation (being illustrated by arrow R1) of photosensitive-member 1 with this sequentially around photosensitive-member (figure
As load bearing component) arrangement.Fixing device 6 is placed on the downstream of transfer device 5 along the direction of transfer of recording materials P.Now will below
Each imaging device related to imaging is sequentially described.
(photosensitive-member)
It is tubular (drum type) electrophotographic photosensitive member as the photosensitive-member 1 of image bearing member with reference to Fig. 2, the electricity
Sub- photosensitive part includes the organic optical quasiconductor light-sensitive surface with negatively charged characteristic.The photosensitive-member 1 has 84 millimeters
Diameter and 380 millimeters of longitudinal length, and with 500 millimeters of processing speeds per second (peripheral speed) along shown in arrow R1
Direction rotates around central axis (not shown).
(charging device)
As shown in Fig. 2 the charging device 2 in the present embodiment is Scorotronl (scorotron) corona charging device, including：
Discharge metal silk 2h, each discharge metal silk is used as charging electrode；U-shaped conductive shielding part 2b, the U-shaped conductive shielding part is arranged to
Around discharge metal silk；And grid electrode 2a, the grid electrode is arranged in the opening of shielding part 2b.Make in the present embodiment
In corona charging device, two discharge metal silk 2h are arranged to support the increase of image taking speed, and therefore shielding part
2b has spacer portion so that spacer portion is between discharge metal silk 2h.
The corona charging device 2 is placed along the generatrix direction of photosensitive-member 1.Therefore, the longitudinal direction of corona charging device 2 and sense
The axis direction of light part 1 is parallel.With reference to the part (b) of Fig. 5, grid electrode 2a is placed along the circumferential surface of photosensitive-member,
So that grid electrode in transverse direction (direction of motion of photosensitive-member) middle part compared with grid electrode two ends farther away from sense
Light part.In other words, grid electrode 2a is placed with recessed along photosensitive-member.Therefore, in the present embodiment, corona charging
Device 2 can be positioned to closer to photosensitive-member 1 compared with prior art, so as to increased charge efficiency.In the present embodiment, adjust
Whole charging device causes grid electrode 2a near photosensitive-member and distance between the two is of about 1 to 2 millimeter.
Corona charging device 2 is connected with the charging bias applying power supply S1 for being used to apply charging bias, and with such work(
Can, i.e. the charging bias applied with the applying power supply S1 in charge position a are by the surface uniform charging of photosensitive-member 1 to bearing
Potential.Specifically, the charging bias obtained by being superimposed alternating voltage on DC voltage are applied to into discharge metal silk 2h
With grid electrode 2a.According to the present embodiment, corona charging device 2 is additionally provided with charger shield, the electric discharge generated for preventing from discharging
Product adheres to photosensitive-member 1.As the charger shield of the sheet blocking parts (shield) for blocking corona charging device opening
Construction will be described in detail below.
(for other building blocks of imaging)
Exposure device 3 in the present embodiment is laser beam scanner, and the laser beam scanner includes semiconductor laser, should
The photosensitive-member 1 that semiconductor laser laser L irradiations are charged by corona charging device 2.Specifically, exposure device 3 is based on from logical
Cross the picture signal output laser L of the master computer transmission that network cable is connected with imaging device.The photosensitive-member 1 for having charged
Surface is exposed to laser L in exposure position b along main scanning direction.Photosensitive-member rotation repeats to expose along main scanning direction simultaneously
Light so that the potential in the part irradiated by laser L on the charging surface of photosensitive-member 1 reduces, so as to be formed based on figure
As the electrostatic latent image of information.Main scanning direction is the direction parallel with the bus of photosensitive-member 1, and sub-scanning direction is and photographic department
The parallel direction in the direction of rotation of part 1.
Developing unit 4 in the present embodiment allows developing agent (toner) to adhere to by corona charging device 2 and exposure dress
3 electrostatic latent images being formed on photosensitive-member 1 are put, so as to by image viewing.Developing unit 4 in the present embodiment uses two groups
Divide magnetic brush development method, and also using discharged-area development method.
Development sleeve 4b applies power supply S2 and is connected with developing bias.Cause in the developing bias applied by applying power supply S2
Under electric field action, adhere to the being allowed to select property of toner being carried in the developing agent on the surface of development sleeve 4b photosensitive
Electrostatic latent image on part 1.As a result, electrostatic latent image is developed for toner image.In the present embodiment, toner adheres to sense
The part (or the part irradiated with laser) for having exposed on light part 1, so as to by electrostatic latent image discharged-area development.
Transfer device 5 in the present embodiment includes transfer roll, as shown in Figure 2.The transfer roll 5 under predetermined thrust with sense
The surface pressing contact of light part 1.Pressure contact nip portion is used as transfer area d.Recording materials P (such as paper or transparent
Film) send transfer area d to from sheet material feed cassette in predetermined control timing.
When the recording materials P supplied to transfer area d is pressed and transmitted between photosensitive-member 1 and transfer roll 5, sense
Toner image on light part 1 is transferred to recording materials P.Now, transfer bias apply power supply S3 will with toner
The transfer bias (being in the case+2KV) of normal charging polarity (negative polarity) opposite polarity be applied to transfer roll 5.
Fixing device 6 in the present embodiment includes fixing roller 6a and backer roll 6b.By toner image by transfer device 5
The recording materials P being transferred to thereon is sent to fixing device 6, and is heated and pressurizeed by fixing roller 6a and backer roll 6b, so as to incite somebody to action
Toner image is on the surface of the recording materialp.Then, the recording materials P Jing after fixing is expelled to into device external.
Cleaning device 8 in the present embodiment includes cleaning doctor, as shown in Figure 2.Toner image is turned in transfer device 5
After printing on the recording materialp, cleaning doctor 8 removes the residual toner stayed on photosensitive-member 1 after transfer.
Optics electric discharge device 9 in the present embodiment includes electric discharge Exposing Lamp, as shown in Figure 2.Stay in cleaned device 8 to clean
Electric charge Jing optics electric discharge device 9 on the surface of photosensitive-member 1 afterwards is discharged by light irradiation.
A series of image processing steps carried out by the above-mentioned device for imaging terminate.These devices are ready for down
Polaroid operation.
§ 2. { specific configuration of charging device }
The material and the machine for opening and closing the shield of the shutter pieces for charging device is described below
Structure.Will be described in detail later the part of the shape of management and control shield and the protection sheet material of protective screen.
(charger shield)
Charger shield 10 will be introduced now, its sheet part as the opening for opening and closing corona charging device 2.
The opening of corona charging device 2 is referred to and is formed in shielding part and corresponding with the region (W in Fig. 3) that corona charging device 2 charges
Opening.Therefore, the region W by corona charging device charging is substantially consistent with the region that can be electrically charged of photosensitive-member 1.
Fig. 3 is showed a status that, i.e. be rolled for along X side in the charger shield 10 as sheet part
Charger shield 10 is opened while moving to (opening direction).Fig. 4 is showed a status that, i.e. as sheet portion
The charger shield 10 of part be pulled in order to along Y-direction (closing direction) move while charge closing device shield 10.
In the present embodiment, as shown in Figure 3 and Figure 4, with end and the piece that can be wound into a roll by winder unit 11
Material shape shield (hereinafter referred to as " charger shield ") is used as the charger shield 10 of the opening for opening and closing corona charging device 2.
One of reason is to prevent the corona product dropped towards photosensitive-member 1 from corona charging device 2 from passing through.As Another reason,
Due to moving in slit of the charger shield between photosensitive-member 1 and grid electrode 2a, in order to prevent (prevent) charger from hiding
Dash-board injury photosensitive-member 1 so that even if image deterioration also will not occur when charger shield is contacted with photosensitive-member 1.Therefore, exist
In the present embodiment, with the sheet nonwoven fabric material comprising the rayon fiber with 150 μ m thicks as charger shield
10.Charger shield 10 is designed to be able to during being imaged in one end of corona charging device 2 (main scanning side along the longitudinal direction
To) retraction rolling the reason for be reduce accommodate retract charger shield 10 (during opening) space.In this case, charge
By leaf spring management and control, this is described below the shape of device shield one end.The other end of charger shield is by as winder
Take-up roll apply the tension force along shield opening direction under stretch.
(for driving the mechanism of charger shield)
Will now be presented for opening and closing mechanism's (motion) of charger shield 10 now.Fig. 3 shows charger
The open mode of shield 10, Fig. 4 shows the closed mode of charger shield.The part (a) of Fig. 5 shows opening and closing
The perspective view of the details of mechanism, the part (b) of Fig. 5 is the corona charging that the one end from corona charging device along the longitudinal direction is observed
The sectional view of device.The opening and closing mechanism includes motor M, winder unit 11, keeps the first fortune of charger shield 10
Dynamic component 21, the second moving component 12 and rotary part 13 that keep cleaning member 14.These parts allow charger shield
10 (master sweeps anchor direction) opening or closings along the longitudinal direction.As shown in the part (b) of Fig. 3 and Fig. 5, corona charging device 2 is provided with
The shield the detector unit 15 whether opening operation of detection charger shield 10 completes.Shield detector unit 15 is interrupted including light
Device.Shield detector unit 15 is configured to whether the opening operation for detecting charger shield 10 completes, and when the first fortune
Dynamic component 21 reaches opening operation and completes to stop the rotation of motor M during position.
First moving component 21 and the second moving component 12 include drive transmission member 22, and the drive transmission member is arranged
Into being screwed together with rotary part 13.First moving component 21 and the second moving component 12 are by drive transmission member 22 and rotation
Rotation member 13 is drivingly coupled.Additionally, it is above-mentioned tighten operation so carry out so that the first moving component 21 and the second moving component
12 can move on the guide rail 2c being arranged on corona charging device 2 only along main scanning direction.So prevent the first motion portion
The moving component 12 of part 21 and second rotates together with rotary part 13.Rotary part 13 has helicla flute, one end of the groove and tooth
Wheel 18 connects.On the other hand, one end of motor M is connected with worm gear 19.The driving force of motor M passes through the He of worm gear 19
Engagement between gear 18 is transferred to rotary part 13.When motor M rotates rotary part 13, the first moving component 21
Move along helicla flute on main scanning direction (X, Y-direction) with the second moving component 12.Therefore, using the arrangement, rotation is worked as
When motor M drives rotary part 13, in the motoricity opened or close on direction by being combined into the first moving component 21
Connection parts 21b of one are transferred to charger shield 10.Second moving component 12 is integrally provided with connection parts 12b, the connection
Relay part keeps the cleaning member 14 for cleaner discharge tinsel 2h.
Therefore, when motor M makes as described above charger shield 10 move along main scanning direction (X or Y-direction)
When, cleaning member 14 is also moved in a similar direction simultaneously.Therefore, same motor M can be driven to discharge metal silk 2h
With the cleaning of charger shield 10.
(mechanism of winding charger shield)
The mechanism of winding charger shield 10 will be introduced now.The part (b) of Fig. 6 is to show the winding as winder
The schematic diagram of the construction of unit 11.The schematic diagram of the part (a) of Fig. 6 is showed a status that, i.e. winder unit 11 is attached to
For winder unit 11 to be attached to the guiding fixed component 35 of corona charging device 2.
Winder unit 11 includes tubular take-up roll 30 (winding unit), and the take-up roll fixes an end of charger shield 10
Portion is simultaneously wound；Axle portion part 32, the axle portion part axle journal supports take-up roll 30；With load bearing component 31, the axle journal of load bearing component 31
Support the other end of take-up roll 30.Winder unit 11 also includes parallel pin 34, and the parallel pin is used as load bearing component 31 is fixed to
The fixed component of axle portion part 32；With spring (driving part) 33, the spring is placed in take-up roll 30, with take-up roll 30 and carrying
Part 31 is engaged.Winder unit 11 be designed to when be attached to as illustrated in fig. 6 guiding fixed component 35 when, load bearing component 31 it is convex
31a is played against the rib 35a of guiding fixed component.Therefore, load bearing component 31 and axle portion part 32 are fixed in non-rotatable mode, and
Only take-up roll 30 is supported by rotatably axle journal.
In attachment, in order to the revolving force along A directions is produced in load bearing component 31 while take-up roll 30 is fixed,
Load bearing component 31 is rotated several times along B directions before winder unit 11 is attached to guiding fixed component 35.As a result, when along opening
When direction (Y-direction) pulls charger shield 10, the twisting resistance of spring 33 is along so that take-up roll 30 winds charger shield 10
Direction acts on.Now, due to being applied with the power along the effect of A directions to load bearing component 31, load bearing component 31 is against guiding fixed part
Part 35 is simultaneously fixed in non-rotatable mode.
In order to prevent charger shield 10 from relaxing when moving along opening direction, need to apply to roll up in advance to winder unit 11
Around the degree that power will not relax until charger shield 10.In the present embodiment, in charger shield 10 it is moved to such as Fig. 3 institutes
When the operation shown completes position, minimize to the take-up force of winder unit 11.Therefore, take-up force now is set as preventing
The lax take-up force lower limit of charger shield 10, and load bearing component 31 is set in based on the lower limit is attached to guiding and fix
The number of times that load bearing component 31 is rotated along B directions before part 35.Therefore, in order to open charger shield (Fig. 3), mechanism is with as follows
Mode works.When motor M makes charger shield 10 move in X direction, charger shield 10 by take-up roll 30 constantly
Winding is without lax downwards.
On the other hand, for charge closing device shield 10 (Fig. 4), mechanism is operated as follows.Motor M is allowed
The urge of spring 33 in the opposing take-up roll 30 of charger shield 10 unwinds from take-up roll 30, so as to charger shield 10 along
Y-direction is moved.When charger shield 10 is closed (in position alpha 2), by spring 33 in take-up roll 30 apply in X direction
Urge is acted on charger shield 10.Therefore, charger shield 10 will not relax downwards.Because arrangement is designed such that
When closed gap is hardly formed between charger shield 10 and corona charging device 2, therefore, it is possible to keep wherein corona to produce
The state that thing is hardly leaked out.
(range of movement of charger shield)
With reference to Fig. 3, when charger shield 10 is opened, the first moving component 21 and the second moving component 12 are parked in respectively it
Open position α 1 and β 1 in.Open position α 1 and β 1 are to work as to be configured to detect that charger shield 10 opens the screening for completing
Plate detector unit 15 detects the first moving component 21 to stop defined location during opening operation.Now, α indicates that charger hides
The end position of plate 10, β indicates the end face of the cleaning member 14 on winding side.Open position α 1 is arranged to compare region of discharge with β 1
Domain W is closer to winding side.In addition, the open position α 1 of the first moving component 21 be arranged to compare photosensitive-member 1 in winding side
On an end face closer to winding side so that even if when photosensitive-member 1 rotates under normal operation, charger shield 10
Will not contact with photosensitive-member 1.
When charge closing device shield 10, the first moving component 21 and the second moving component 12 are keeping their open positions
The distance between while move along Y-direction.As shown in figure 4, the first moving component 21 and the second moving component 12 are against rear gear
Block 2e, is then parked in respectively their closed position α 2 and β 2.From setting in motion after the scheduled time in the past, stop motor
The driving of M is so as to the shutoff operation of complete charge device shield 10.
In order to open charger shield 10, the first moving component 21 and the second moving component 12 are keeping them closing behaviour
State when making and it is intimate contact with one another while move in X direction.Afterwards, the second moving component 12 is against positive stop 2d, and
First moving component 21 against barricade, so as to these parts are parked in open position α 1 and β 1.Now, shield detector unit 15
The first moving component 21 is detected to stop motor M, so as to terminate opening operation.
§ 3. { for the bending applying mechanism of charger shield }
As described above, grid electrode 2a is positioned so that into grid electrode (circumferencial direction of photosensitive-member) in transverse direction
To compare grid electrode farther from photosensitive-member 1 along the two ends of the circumferential surface of photosensitive-member 1 at middle part.Use will now be described
In management and control charger shield 10 so that the shape of charger shield 10 substantially follows (correspond to) the circumference table of photosensitive-member 1
The bending applying mechanism of the bending in face.
(for along the bending applying mechanism of the end for closing direction)
First, the end introduced to charger shield 10 is applied the mechanism of bending.The part (b) of Fig. 5 is from electricity
The sectional view of corona charging device when the horizontal direction of dizzy charger is observed.Fig. 7 includes showing in the shield as management and control part
Fixed component 17 is attached to the schematic diagram of the state (a) before connection parts 21b, and shows the state (b) after attachment
Schematic diagram.
With reference to the part (b) of Fig. 5, for charger shield 10 to be fixed to the shield fixed component of the second moving component 12
17 ends for being attached to charger shield 10 along the longitudinal direction, the end is located at outside the winding scope of winder unit 11.
The shield fixed component 17 is made up of elastomeric element, to follow the circumference table of photosensitive-member 1 when connection parts 21b are attached to
The bending in face.Specifically, as shown in the part (a) of Fig. 7, shield fixed component 17 is designed so that the metal with spring properties
The width L2 (before elastic deformation) of thin slice (leaf spring) is less than the width L1 between the attachment of connection parts 21b.Charger
Shield is combined with a surface of the neighbouring photosensitive-member 1 of leaf spring.Therefore, charger shield is integratedly moved with leaf spring.At it
By in the charger shield of leaf spring management and control, charger middle part along the longitudinal direction is compared in the part near leaf spring of shield to shape
Rub more violent with grid electrode.In this case, shield fixed component 17 for corresponding connection parts 21b
The angle [alpha] that each attachment contact pin 17a is formed with the attachment face 17b on the rear surface for fixing charger shield 10 is set to be less than
Or equal to 90 degree (being in the present embodiment 45 degree).
Therefore, when shield fixed component 17 is attached to connection parts 21b, the elastic deformation of shield fixed component 17, and quilt
Apply shown in the part (b) just like Fig. 7 along power F for making part 17 leave the direction effect of photosensitive-member 1.As a result, shield is fixed
Part 17 has flexibility so that shield attachment face 17b middle parts in transverse direction project farther than its two ends such that it is able to
The end of charger shield 10 applies bending.Shield arches upward upward (convex relative to grid electrode along the direction contrary with gravity
Go out or recessed relative to photosensitive-member), there is rigidity without lax towards photosensitive-member so as to allow shield.In other words,
Shield is by leaf spring management and control so that compares the two ends of shield and projects farther towards corona charging device in the middle part in transverse direction of shield.
It is placed on apart from the inner side at about 1 to 3 millimeter of shield edge as the leaf spring of management and control part.
(the bending applying mechanism on winder unit side)
In addition, in the present embodiment, such as shown in the part (a) of Fig. 6, as rotary part (or the institute of guide member 16
The driven voller of meaning) the winding entrance of the winder unit 11 for charger shield 10 is placed on as the second bending applying mechanism
On.
Different from shield fixed component 17, the guide member 16 is pivotably supported by guiding fixed component 35, and quilt
It is configured for guiding charger shield 10 while opening or shutoff operation according to charger shield 10 rotate.Cause
This, guide member 16 can cause charger shield 10 to prevent from opening when having desired flexibility in management and control charger shield 10
Or the load needed for charge closing device shield 10 increases.Guide member 16 is placed on outside the winding scope of winding unit 11
In position so that guide member 16 compares photosensitive-member 1 closer to winding unit 11.
Be positioned to compare at the top of driven voller as guide member 16 photosensitive-member 1 near corona charging device 2
Partly (external peripheral surface of photosensitive-member 1) is closer to corona charging device 2.Charger shield 10 when being opened or closed
Slide on guide member 16.Guide member 16 is placed only on the middle part in transverse direction of corona charging device 2, and is configured to
For applying bending to charger shield 10 in the way of similar to shield fixed component 17.Additionally, guide member 16 is also served as
Shield inserts guiding piece, for the minimal clearance guiding charger shield 10 between grid electrode 2a and photosensitive-member 1.
Therefore, though on that side that charger shield 10 is wound by winder unit 11, the shape of charger shield 10
Can be maintained so that compare its two ends and project farther towards corona charging device 2 in its middle part in transverse direction.Hide to charger
Plate 10 apply this shape contribute to as much as possible reduce corona charging device 2 (grid electrode 2a) and photosensitive-member 1 between
Gap.The flexibility of charger shield 10 need not be consistent with the flexibility of the circumferential surface of photosensitive-member 1, as long as curved between them
Difference in curvature does not affect the opening and closing of charger shield to operate.
(part of the end of protection charger shield)
The protection sheet material 25 of the part of the end as protection charger shield 10 is described below.Fig. 1 is to show this
The schematic diagram of the end of the charger shield in embodiment.Fig. 3 shows the open mode of charger shield 10 in the present embodiment,
Fig. 4 shows the closed mode of charger shield in the present embodiment.
In the present embodiment, as described above, with comprising with 150 μ m thicks rayon fiber sheet adhesive-bonded fabric
Material is used as charger shield 10.In addition, corona charging device 2 has above-mentioned flexibility.The end of charger shield 10 be provided with by
Shield fixed component 17 made by elastomeric element.When shield fixed component 17 is attached to connection parts 21b, shield fixed component
17 are elastically deformed as shown in the part (b) of Fig. 7, so as to produce the urge F acted on along the direction away from photosensitive-member 1.
In order to keep the bending, urge F to act on so as to always by charger shield 10 towards charging lump 2d and grid
Electrode 2a is pressed against.Therefore, the part for being attached to shield fixed component 17 of charger shield 10 is always in charging lump 2d and grid
Rub on electrode 2a.Due to having used the charger shield 10 wherein near photosensitive-member to tie with the leaf spring of the shape of management and control shield
The arrangement of conjunction, the surface combined with leaf spring of charger shield does not have and grid electrode friction, but the piece of shape described in management and control
Spring is contacted with grid electrode.Using this arrangement, grid electrode is scraped when rubbing with leaf spring, therefore affects charging
Energy.As described above, although charger shield is combined near photosensitive-member with the surface of leaf spring, the charger shield near leaf spring
Its shape compared by the part of leaf spring management and control charger shield the longitudinal direction along corona charging device middle part and grid electricity
Pole friction is more violent.Adversely, adhesive-bonded fabric charger shield 10, particularly its part near leaf spring is rubbed becomes
It is impaired.In order to prevent this phenomenon, in the present embodiment, as shown in figure 1, setting as the protection sheet material 25 of thin sheet part
It is set in the face of shield fixed component (or neighbouring grid electrode 2a).The protection sheet material 25 includes 50 μm of PET film part, so as to
Shield fixed component 17 will not be hindered to bend.It is positioned to cover leaf spring and charger shield as the PET film of protection sheet material
Easily impaired end when by leaf spring management and control.
The protection sheet material 25 prevent charger shield 10 under the urge F effects of shield fixed component 17 directly and grid
Electrode 2a and charging lump 2d rubs, so as to prevent charger shield 10 to be worn.Protection sheet material 25 is located therein in shield such as
Outside the scope that charger shield 10 is wound by winding unit 11 when opening as shown in Figure 3 (state illustrated in Fig. 5 (a)).Cause
This, when protection sheet material 25 is arranged for charger shield 10, will not make the windability deterioration of charger shield 10.In other words,
It is that shield arranges protection sheet material to cover as the management and control part that shield end is placed on along closing direction in grid electrode side
Leaf spring.Width of the protection sheet material in opening/closing direction can correspond in shield stop position α 1 and shield by roller
Width between the position of winding.As a result, the PET film (resin sheet) that shield rubs with grid electrode is prevented not by take-up roll
Winding and deformation.PET film can protective screen, without hinder shield opening/closing operation.
In the present embodiment, it has been explained that as the elastic resin sheet material of the preferred exemplary of the material of protection sheet material 25
(PET film).As long as however, shield fixed component 17 do not hinder apply bending needed for urge F, and material compare for
The adhesive-bonded fabric of charger shield is more wear-resisting, then there is no need for material to be limited to resin sheet.Specifically, in GAKUSHIN types
Protection sheet material (PET film) can be provided and compare the higher rub resistance of charger shield (rayon non-woven's fabric) in friction testing
Property, and providing less than leaf spring, caused elastic by bending, above-mentioned GAKUSHIN types friction testing is used in JIS L-
The friction testing device of specification in 0849.Rub resistance can be assessed (by predetermined with the method for testing of specification in JIS K7204
The size of the amount being scratched after polishing roll polishing).
(direction that charger shield is wound)
Now the direction that charger shield 10 is wound will be introduced.The winding unit 11 under the state (Fig. 3) that shield is opened
On charger shield 10 winding number and the charging in the state of charger shield 10 closes (Fig. 4) on winding unit 11
The winding number of device shield 10 is different.Therefore, when shield is closed charger shield 10 from the position of the uncoiling of winder unit 11 with
When shield is opened, the position of charger shield is different.
For example, if the surface of the neighbouring corona charging device 2 of charger shield 10 on winder unit 11 towards inner side, that
Charger shield 10 (that is, is being filled according to the operation of charge closing device shield 10 closer to the building block of corona charging device 2
Put charging lump 2d above) move.Adversely, the building block of corona charging device 2 rubs with charger shield 10 so that fill
Electrical equipment shield 10 becomes impaired.Therefore, in the present embodiment, charger shield 10 is so on winder unit 11 so that
The surface of the neighbouring corona charging device 2 of charger shield 10 is on winder unit 11 towards outside, the such as part (b) of Fig. 3 and Fig. 4
Part (b) shown in.Therefore, charger shield 10 is configured to leave the building block of corona charging device 2 according to shutoff operation
(that is, the charging lump 2d before device) move.In addition, the corona charging device 2 in the present embodiment includes having along photographic department
The grid electrode 2a and U-shaped shielding part 2b of the flexibility of the circumferential surface of part 1.Winder unit 11 is positioned so that shielding part 2b is limited
Fixed plane of the opening is substantially flushed with the unwinding position when shield is located at open position, alternatively, unwinding position (charger
The top of shield) the opening plane is compared closer to photosensitive-member 1.
In addition, guide member 16 is arranged on the middle part in transverse direction of corona charging device 2 so that guide member 16 is compared
The external peripheral surface of photosensitive-member 1 projects farther towards corona charging device 2.So to charger shield 10 along whole longitudinal direction
Apply bending, and also prevent charger shield 10 from moving near the ground of photosensitive-member 1 on whole longitudinal direction.As a result, screening is worked as
The unwinding position of charger shield 10 is closest to the position of corona charging device 2 when plate is located in open position.When closed, fill
Electrical equipment shield 10 can keep suitable gap along whole longitudinal direction with each in photosensitive-member 1 and corona charging device 2.
It is therefore prevented that charger shield 10 rubs in opening or closing with the building block of photosensitive-member 1 and corona charging device 2
Wipe.
As described above, in the present embodiment, neighbouring management and control part is charger shield not by the portion of retractor reel
Divide and sheet guard block is provided.Which prevent because friction is led between charger shield and the building block of corona charging device
The shield abrasion of cause such that it is able to be suitably carried out the opening/closing operation of shield.
Above-described embodiment is the invention is not limited in, it is various in the case of without departing from the spirit and scope of the present invention
Modifications and variations are all possible.In order that the scope of the present invention is disclosed in crowd, following claims is enclosed.
Reference table
1 photosensitive-member
2 chargers
2a grid electrodes
2b shielding parts
2h discharge metal silks
10 charger shields
11 winder units
16 management and control parts
25 protection sheet materials
Claims (6)
1. a kind of charging device, the charging device is configured to charge photosensitive-member, and including：
Corona charging device, the corona charging device include discharge metal silk, the U-shaped conductive shielding part around the discharge metal silk,
It is formed in the grid electrode closer to the opening on photosensitive-member side and arrangement in said opening of the shielding part；
Sheet shield, the sheet shield is configured to open and close the electricity along the longitudinal direction of the corona charging device
The opening of dizzy charger, wherein the shield is arranged to than grid electrode closer to photosensitive-member；
Motion, the motion is configured to keep the shield and makes shield along the longitudinal direction of corona charging device
It is mobile；And
Winder, the winder is configured to move along the opening direction of the opening and wind the screening in response to the shield
Plate；
Characterized in that, shield fixed component is attached to the motion, the shield fixed component is along described when closing
The shield surface closer to the grid electrode is fixed on during opening at the front end of the moving direction of the shield；
Wherein, the shield fixed component includes being fixed on the fixed part of the shield；And
Wherein, the charging device also includes sheet part, and the sheet part is arranged in described at the fixed part
Grid electrode and closer between the shield surface of the grid electrode.
2. charging device as claimed in claim 1, wherein, the sheet part is arranged in shield fixed component.
3. charging device as claimed in claim 1, wherein, the shape of shield described in the shield fixed component management and control so that
Shield corresponding to photosensitive-member circumferencial direction middle part transversely than shield two ends towards corona charging device further
It is prominent.
4. charging device as claimed in claim 1, wherein, the sheet part be arranged in winder winding scope it
Outward.
5. charging device as claimed in claim 1, wherein, the sheet part includes resin.
6. charging device as claimed in claim 1, wherein, the fixed part is the sheet metal with spring properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410370546.6A CN104133354B (en) | 2010-03-09 | 2010-03-09 | Charging apparatus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410370546.6A CN104133354B (en) | 2010-03-09 | 2010-03-09 | Charging apparatus |
| CN201080035098.4A CN102472990B (en) | 2010-03-09 | 2010-03-09 | Charging device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080035098.4A Division CN102472990B (en) | 2010-03-09 | 2010-03-09 | Charging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104133354A CN104133354A (en) | 2014-11-05 |
| CN104133354B true CN104133354B (en) | 2017-04-12 |
Family
ID=51806083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410370546.6A Active CN104133354B (en) | 2010-03-09 | 2010-03-09 | Charging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104133354B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS607447A (en) * | 1983-06-27 | 1985-01-16 | Toppan Printing Co Ltd | Electrostatic charging method |
| JP2007072212A (en) * | 2005-09-07 | 2007-03-22 | Canon Inc | Image forming apparatus and image forming method |
| JP2009128617A (en) * | 2007-11-22 | 2009-06-11 | Kyocera Mita Corp | Charger and image forming apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4850619B2 (en) * | 2006-08-14 | 2012-01-11 | キヤノン株式会社 | Image forming apparatus |
-
2010
- 2010-03-09 CN CN201410370546.6A patent/CN104133354B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS607447A (en) * | 1983-06-27 | 1985-01-16 | Toppan Printing Co Ltd | Electrostatic charging method |
| JP2007072212A (en) * | 2005-09-07 | 2007-03-22 | Canon Inc | Image forming apparatus and image forming method |
| JP2009128617A (en) * | 2007-11-22 | 2009-06-11 | Kyocera Mita Corp | Charger and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104133354A (en) | 2014-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102472990B (en) | Charging device | |
| US8340553B2 (en) | Image forming apparatus including corona charger | |
| KR101148603B1 (en) | Corona charger including shutter | |
| US8630567B2 (en) | Charging device having movable holding member for shutter and image forming apparatus having the same | |
| US8554112B2 (en) | Charging device | |
| US8626020B2 (en) | Image forming apparatus | |
| CN103399473A (en) | Charging device | |
| CN104133354B (en) | Charging apparatus | |
| US20130108322A1 (en) | Process Unit and Image Forming Device Including the Same | |
| JP2011186227A (en) | Charging device | |
| JP2015068975A (en) | Charging device, process cartridge, and image forming apparatus | |
| CN103048908B (en) | Charging device | |
| JP3352384B2 (en) | Charging method, charging device, image forming apparatus, and process cartridge | |
| JP3888675B2 (en) | Cleaning device and image forming apparatus having the cleaning device | |
| JP2002287597A (en) | Cleaning device and image forming apparatus having the same | |
| JP5825868B2 (en) | Charging device | |
| JP3680567B2 (en) | Charged brush | |
| JP4956970B2 (en) | Cleaning device | |
| US20230048499A1 (en) | Image forming apparatus | |
| JP4113658B2 (en) | Image forming apparatus | |
| JP5745023B2 (en) | Charging device | |
| JPH0954482A (en) | Image forming device and wire cleaning device for electrifier thereof | |
| JPH0990838A (en) | Cleaning device and image forming device using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |