CN101114146A - Charging device and image forming apparatus - Google Patents
Charging device and image forming apparatus Download PDFInfo
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- CN101114146A CN101114146A CNA2007101373112A CN200710137311A CN101114146A CN 101114146 A CN101114146 A CN 101114146A CN A2007101373112 A CNA2007101373112 A CN A2007101373112A CN 200710137311 A CN200710137311 A CN 200710137311A CN 101114146 A CN101114146 A CN 101114146A
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Abstract
A charging device includes a rotatable screw gear, a motor, a support, and a protruding member. The screw gear is positioned along length of a linear electrode. The motor rotates the screw gear in forward and reverse directions. The support holds the cleaning member mounted so as to be in contact with the electrode, and is mounted unrotatably but reciprocably between a first end and a second end of the electrode. The member extends perpendicular to the length of the electrode from the support, and has a projection for being elastically fitted into a thread groove of the screw gear along a radial direction of the screw gear. The member is configured in such a manner that a distance between a starting point of elastic deformation of the member and a contact point between the projection and a thread of the screw gear differs according to whether the support is moved forward or backward.
Description
Technical field
The present invention relates to a kind of charging device of discharging in the electrophotographic image forming process of being used for, and relate to the imaging device that is equipped with this charging device.
Background technology
The non-contact charger that is suitable in the electrophotographic image forming comprises electrode.This electrode is applied high pressure makes this electrode discharge to photoreceptor.The advantage of normally used needle electrode is, when it is applied high pressure, only produces small amount of ozone.
Yet, the dust in the part absorption environment of the needle electrode of generation high-voltage electric field.
A large amount of dust on the electrode hinder its regular picture.
JP H11-338265A discloses a kind of charging device that comprises needle electrode and a pair of liner.This electrode has the pin of a plurality of one-tenth arrays.Liner is bearing in the both sides of the pin array of electrode in a movable manner.Liner is consequently removed dust from pin along the mobile liner contact pin in order that makes of pin array.
In prior-art devices, manually move the cleaning device that comprises liner.Therefore, can not clean this electrode at reasonable time according to the Dust Capacity on it sometimes.
Feature of the present invention provides a kind of charging device and a kind of imaging device that is equipped with this charging device, utilize simple control and structure, this charging device can make cleaning device between the two ends of needle electrode accurately and to-and-fro movement exactly, and irrelevant with the Dust Capacity on the electrode.
Summary of the invention
A kind of charging device comprises: rotatable screw drive mechanism, motor, support and protruding part.Screw drive mechanism is along the length location of linear electrode.Motor makes this screw drive mechanism forward or reverse rotation.This support keep clean part be mounted to the contact this electrode.This support is installed in non-rotatable mode, but can to-and-fro movement between first end of this electrode and second end.This protruding part begins to extend from this support perpendicular to the length direction of this electrode.This part has projection, is used for being assembled in the thread groove of this screw drive mechanism along the radial elastic of this screw drive mechanism.Distance between the contact point between the elastic deformation starting point that this part is configured such that this part and the screw thread of this projection and this screw drive mechanism moves forward according to this support or is mobile and different backward.
When this motor rotated this screw drive mechanism forward, this projection contacted screw thread second distolateral of this screw drive mechanism, so that this support moves forward.When this motor made this screw drive mechanism reverse rotation, this projection contacted screw thread first distolateral of this screw drive mechanism, so that this support moves backward.
This support arrived as along forwards to the end second end or as behind first end of the end of backward directions, when this screw drive mechanism continued rotation, the part elastic deformation made projection along the direction displacement of crossing screw thread.The elastic force that is applied on this part changes according to its deformation angle.The deformation angle that depends on the distance between the contact point between starting point and this projection and this screw thread of elastic deformation of this part moves forward according to this support or is mobile and different backward.Even this part is configured to still can be out of shape with comparalive ease at arbitrary end of first end and second end when oversize when this screw drive mechanism rotates.Do not need accurately to control the rotation of this screw drive mechanism like this.
Description of drawings
Fig. 1 is the cut-open view that comprises according to the imaging device of the charging device of the embodiment of the invention;
Fig. 2 A is the front section view according to the charging device of first embodiment of the invention;
Fig. 2 B is the side view of the relevant portion of this device;
Fig. 3 is the synoptic diagram that the clean operation that is arranged on the clearer in this device is shown;
Fig. 4 is the side view of this device;
Fig. 5 A is the planimetric map of the relevant portion of this device;
Fig. 5 B is another planimetric map of the relevant portion of this device;
Fig. 6 A is the front section view according to the charging device of second embodiment of the invention;
Fig. 6 B is the side view of the relevant portion of this device;
Fig. 7 A is the planimetric map of the relevant portion of this device; And
Fig. 7 B is another planimetric map of the relevant portion of this device.
Embodiment
Below, with preferred embodiments of the invention will now be described with reference to the accompanying drawings.Fig. 1 is the cut-open view that comprises according to the imaging device 100 of the charging device 1 of the embodiment of the invention.Under arbitrary pattern of duplicating machine pattern, printer mode and facsimile recorder pattern that the user selects, equipment 100 is gone up at paper (comprising the recording medium such as OHP) and is formed image.This equipment can be with image print on the two sides of paper.
In the bottom of this equipment, defeated paper part 20 has defeated paper disc 21 and pick-up roller 22.Leave the paper that will be fed to paper transmission path S1 in the imaging process in the defeated paper disc 21.Pick-up roller 22 rotations are to be fed to path S1 with paper from defeated paper disc 21.
Imaging moiety 30 is positioned at below the part 10.Part 30 has laser scan unit (LSU) 37, photosensitive drums 31 and fixing device 36.Around this photosensitive drums 31, along the sense of rotation of the photosensitive drums 31 shown in the arrow among Fig. 1, arranged in sequence charging device 1, developing cell 33, transfer device 34 and cleaning unit 35.
On defeated paper disc 21, paper delivery part 40 has exit roller 41 and paper discharge tray 42.Exit roller 41 outputs to paper discharge tray 42 with the paper that path S1 goes up transmission.Exit roller 41 can be rotated in the forward with output paper and can reverse rotation.In double-face imaging, roller 41 reverse rotations are being held under the arm between the roller 41 at the paper that transmits on the S1 of path and have image on first, this paper is delivered to paper transmission path S2 simultaneously.Therefore, this paper is reversed, and makes second facing to photosensitive drums 31, is used for ink powder image is transferred to it.On paper discharge tray 42, the sheet stack of roller 41 outputs builds up a pile.
During initiating key on the push faceplate part, equipment 100 makes roller 22 rotations, with paper feeding to path S1.The registration roller 51 that is arranged on the S1 of path is carried the paper of presenting.
When the forward position of this paper arrived roller 51, roller 51 did not rotate.When the contact of the forward position of this paper was formed on the forward position of the ink powder image on this photosensitive drums 31 between photosensitive drums 31 and this device 34, roller 51 began rotation.
According to the condition of partly importing by guidance panel, the view data that part 10 reads is carried out Flame Image Process, then, it is delivered to LSU 37 as print data.Device 1 surface with photosensitive drums 31 is charged to predetermined potential.By utilizing the surface according to the laser beam irradiation photosensitive drums 31 of this view data modulation, LSU 37 forms electrostatic latent image on charging surface.This device 1 is corresponding to the charging device in the claim.
Then, according to this lip-deep potential difference (PD), the ink powder that sticks on the peripheral surface that is arranged on the magnetic roller 33A in this unit 33 is attracted on the surface of photosensitive drums 31, so that be ink powder image with latent electrostatic image developing.
After the transfer process, when this paper passed through fixing device 36, this paper was heated and pressurizes, so that ink powder image fusion and photographic fixing are on paper.Then, this paper is directed to part 40.
Fig. 2 A is the front section view of device 1, and Fig. 2 B is the side view of the relevant portion of device 1.Device 1 comprises: needle electrode 2, clamper 3, support 4, clearer 5, screw drive mechanism 6 and shell 7.Device 1 is positioned at the top of photosensitive drums 31.
Support 4 is in bottom-open, and slidably is installed in the outside of part 3A.Support 4 has projection 4A and the 4B that is formed on its inner surface.Support 4 keeps vertically part 3A between its top inner surface and projection 4A and 4B, and between inside surface the maintenance level.Like this, on plane, prevent support 4 rotation and other motions perpendicular to the X-axis line.
Rotatably be installed in the lower end of support 4 corresponding to the clearer 5 of the cleaning device in the claim.As an example, roller 5 comprises elastic body, and this elastic body contains hardness and is lower than the material of electrode 2 and is higher than abrasive material such as the dust of ink powder.Insert in the peripheral surface of roller 5 at the tip of pin 2A.
Be assemblied in by rear end 6B in the bearing 3C of clamper 3, screw drive mechanism 6 rotatably is installed.The hole 4C that screw drive mechanism 6 passes support 4 inserts.
Protruding part 4D flatly extends and perpendicular to the length of screw drive mechanism 6 from the upper surface of support 4.Protruding part 4D is the flat board that is made of the elastic deformable material such as resin.Protruding part 4D has protruding 4E.Projection 4E fits in the thread groove of screw drive mechanism 6 along the radially loading of screw drive mechanism 6.
Shell 7 extends on the length of clamper 3, and covers this support 4.Shell 7 guarded electrodes 2.
When leaving terminal in the part 3B in electrode 2 is applied high pressure, the electric field that applies concentrates on the tip of pin 2A.Cause the surface-discharge of pin 2A like this to photosensitive drums 31, thus with this surface charging to predetermined potential.
At least between the pin 2A of two least significant ends, identical with the shape of the xsect of the vertical part 3A of X-axis line.As mentioned above, support 4 is installed in the outside of part 3A, and prevents that support 4 from rotating in perpendicular to the plane of X-axis line and otherwise motion.Support 4 is mounted to when screw drive mechanism 6 rotations, slides along part 3A along the X-axis line between the pin 2A of these two least significant ends at least.When screw drive mechanism 6 rotations, the screw thread of protruding 4E contact screw drive mechanism 6 is so that support 4 slides along the X-axis line.
Fig. 3 is the synoptic diagram that the clean operation of roller 5 is shown.Insert in the peripheral surface of the roller 5 that is rotatably supported by support 4 at the tip of pin 2A.Support 4 with roller 5 when the X-axis line moves, the most advanced and sophisticated order of pin 2A is inserted in the surface of roller 5.When the X-axis line moves, roller 5 acts on its lip-deep resistance rotation by pin 2A.
Support 4 backing rolls 5, thus about 0.5mm is dark in the surface of pin 2A insertion roller 5.Support 4 with roller 5 when the X-axis line moves, insert in the roller 5 gradually at the tip of pin 2A, then, gradually from its extraction.During at the tip of pin 2A insertion roller 5 with from roller 5 extractions, the elastic body of its whole surperficial touch roll 5, and be comprised in the interior abrasive lapping of this elastic body.Because roller 5 rotations in pin 2A inserts roller 5 in proper order and when roller 5 is extracted out are so adjacent needles 2A inserts roller 5 at diverse location at least.The whole surface that guarantees the tip of pin 2A like this is cleaned.
Fig. 4 is the side view of this device 1.Screw drive mechanism 6 is positioned at the top of device 1, and extends on the whole length of clamper 3 substantially.As mentioned above, the rear end 6B of screw drive mechanism 6 is assemblied in the bearing 3C of clamper 3.
The electrode 2 of clamper 3 clampings comprises the mounting portion 9 that is formed on front end.This front end is corresponding to first end in the claim.The profile of the profile of part 9 and part 3B much at one.Part 9 has bearing 9A, motor 8 and sensor 9B.Bearing 9A is formed on the top of part 9.The front end 6A of screw drive mechanism 6 rotatably is assemblied in the bearing 9A.The motor 8 that is installed in the top of part 9 is used for making screw drive mechanism 6 forwards and reverse rotation.The sensor 9B that is installed in the bottom of part 9 is used to detect support 4.
According to from being arranged on the corresponding control section on the equipment 100 and the driving data of device any output of 1, motor 8 forwards or reverse rotation.
At device 1 when being installed on the equipment 100, part 3B and 9 is positioned at outside the imaging region W on the peripheral surface of photosensitive drums 31.Simultaneously, under the state of unclean electrode 2, support 4 be positioned at be arranged on outside the regional W, the spare space of the front of electrode 2.Therefore, support 4, part 3B and 9 and motor 8 do not hinder imaging on the surface of photosensitive drums 31.
In the time will cleaning electrode 2, at first, motor 8 makes the 6 rotation schedule times of screw drive mechanism, so that support 4 moves forward, that is, 2 front end moves to the back-end along the X-axis line from electrode.The contact resistance that electrode 2 pair rollers 5 apply changes according to the Dust Capacity on the pin 2A, and the movement velocity of support 4 changes according to contact resistance.This schedule time is set to be equal to, or greater than when contact resistance is maximum support 4 and moves forward to the time that the rear end spends from the front end of electrode 2.Guarantee that like this support 4 arrives the rear end of electrode 2, and irrelevant with the Dust Capacity on the pin 2A.
Beginning to make screw drive mechanism 6 to be rotated in the forward to have experienced from motor 8 should be after the schedule time, and then, motor 8 makes screw drive mechanism 6 reverse rotations, detects support 4 up to sensor 9B.Therefore, support 4 moves backward, that is, 2 rear end forward end moves along X-axis from electrode, and returns the spare space.
Therefore, support 4 is in the X-axis line to-and-fro movement of part 3A upper edge.In this to-and-fro movement, the most advanced and sophisticated order of pin 2A is inserted in the surface of rotating roller 5.
During at the tip of pin 2A insertion roller 5 with from roller 5 extractions, the whole surperficial touch roll 5 of pin 2A.Guarantee so do not make pin 2A distortion and do not making fiber be adsorbed under the situation on the pin 2A the whole surface at the tip of cleaning pin 2A.
The cleaning device of claim needs not to be clearer 5, but this cleaning device must be the rotor that is rotatably supported by support 4.
Fig. 5 A and 5B are the planimetric maps of the relevant portion of device 1, and the screw thread 6C how protruding 4E contacts screw drive mechanism 6 is shown.As mentioned above, protruding part 4D begins to extend from the upper surface of support 4.On part 4D, protruding 4E forms along the radially loading of screw drive mechanism 6 and fits in the thread groove 6D of screw drive mechanism 6.Projection 4E has partly spherical shape.At protruding 4E and limit betwixt between two adjacent thread 6C of groove 6D and form the gap.
Because this gap, when support 4 when direction shown in the arrow X1 moves forward, the rear side of protruding 4E contact screw thread 6C, shown in Fig. 5 A, when support 4 was mobile backward along direction shown in the arrow X2, the front side of protruding 4E contact screw thread 6C was shown in Fig. 5 B.
Because screw thread 6C tilts with respect to direction X1 and X2, so when support 4 forward and when mobile backward, protruding 4E contacts the not homonymy of screw thread 6C.Therefore, when support 4 forward and when mobile backward, along the direction perpendicular to the Y-axis line of direction X1 and X2, the difference of protruding 4E contact screw thread 6C.
Support 4 along forwards to or after backward directions arrived the end of electrode 2, when screw drive mechanism 6 continued forwards or reverse rotation, part 4D elastic deformation was so that protruding 4E, crosses screw thread 6C to top offset and is coupled among the adjacent slot 6D.Part 4D is bearing in the supporting-point 4F distortion on the upper surface of support 4 from part 4D.
At support 4 forward and when mobile backward, as mentioned above, the difference on the protruding 4E contact screw thread 6C.Therefore, have different distance between the different contact points between some 4D and protruding 4E and the screw thread 6C: when support 4 moves forward, measure distance L 1; And when support 4 is mobile backward, measure distance L 2.Distance L 1 and L2 correspond respectively to first distance and the second distance in the claim.
When crossing screw thread 6C, protruding 4E is to the identical distance of top offset, and moves forward with support 4 or move irrelevant backward.The elastic force that acts on the part 4D depends on the angle that part 4D upwards is out of shape with respect to a 4F.The deformation angle of distance that depends on the contact point between a 4F and protruding 4E and the screw thread 6C when support 4 is mobile backward than when support 4 big when moving forward.Therefore, and compare when support 4 moves forward, when support 4 was mobile backward, bigger elastic force acted on the part 4D.Therefore, and when support 4 is mobile backward, compare, when support 4 moves forward, the easier screw thread 6C that crosses of protruding 4E.
When support 4 moves forward, the screw drive mechanism predetermined long enough time of 6 rotations.Therefore, arrived the rear end of electrode 2 at support 4 after, screw drive mechanism 6 can continue the rotation so that protruding 4E can repeat to cross screw thread 6C.Yet protruding 4E is designed to the easier screw thread 6C that crosses when support 4 moves forward.This design prevents to destroy part 4D, protruding 4E and screw drive mechanism 6, and prevents motor 8 overloads.
By contrast, when support 4 was mobile backward, sensor 9B detected the front end that support 4 arrives electrode 2, and sends detection signal, so that screw drive mechanism 6 stops the rotation.If projection 4E crosses screw thread 6C when support 4 is mobile backward, then relatively large elastic force acts on the part 4D.Yet, when support 4 is mobile backward, prevent that protruding 4E from crossing screw thread 6C.Prevent to destroy part 4D, protruding 4E and screw drive mechanism 6 like this, and prevent motor 8 overloads.
As mentioned above, consider the size that when protruding 4E crosses screw thread 6C, acts on the elastic force on the part 4D, determine to move forward the side that the protruding 4E of quilt of screw thread 6C when mobile backward contacts when support 4.When support 4 moved forward, motor 8 rotated all the time regular time and guarantees that support 4 moves to the rear end of electrode 2, arrives rear ends and need not to detect support 4.So just do not need sensor to detect support 4 in the rear end, thereby prevent the oversize of locking apparatus 1, and the drive controlling that allows the simplification of motor 8.The drive controlling of simplifying allows roller 5 with support 4 suitably to-and-fro movement and can not cause the insufficient cleaning or the breaking plant 1 of motor 2 between the front-end and back-end of electrode 2, and irrelevant with the Dust Capacity on the electrode 2.
Fig. 6 A is the front section view according to the charging device 101 of second embodiment of the invention.Fig. 6 B is the side view of the relevant portion of this charging device 101.Except screw drive mechanism 106 is opposite with the hand of spiral of screw drive mechanism 6, device 101 is similar to the structure of device 1.In the figure, utilize same designated with to installing the corresponding unit, those unit of 1 sign, and for the sake of brevity, omit the detailed description of total unit at this.
Fig. 7 A and 7B are the planimetric maps of the relevant portion of device 101, and it illustrates the screw thread 106C how protruding 4E contacts screw drive mechanism 106.As mentioned above, protruding part 4D begins to extend from the upper surface of support 4.On part 4D, protruding 4E forms along the radially loading of screw drive mechanism 6 and fits among the thread groove 106D of screw drive mechanism 106.Projection 4E has partly spherical shape.At protruding 4E and limit betwixt between two adjacent thread 106C of groove 106D and form the gap.
Because this gap, when support 4 when direction shown in the arrow X1 moves forward, the rear side of protruding 4E contact screw thread 106C is shown in Fig. 5 A.When support 4 was mobile backward along direction shown in the arrow X2, the front side of protruding 4E contact screw thread 106C was shown in Fig. 5 B.
Because screw thread 106C tilts with respect to direction X1 and X2, so when support 4 forward and when mobile backward, protruding 4E contacts the not homonymy of screw thread 106C.Therefore, when support 4 forward and when mobile backward, along the direction perpendicular to the Y-axis line of direction X1 and X2, the difference of protruding 4E contact screw thread 106C.
Support 4 forwards to or after backward directions arrived the end of electrode 2, when screw drive mechanism 106 continued forwards or reverse rotation, part 4D elastic deformation so that protruding 4E crosses screw thread 106C to top offset, was coupled among the adjacent thread groove 106D then.The point 4F that part 4D is bearing in from part 4D on the upper surface of support 4 begins elastic deformation.
When support 4 forward and when mobile backward, as mentioned above, the difference of protruding 4E contact screw thread 106C.Therefore, have different distance between the different contact points between some 4D and protruding 4E and the screw thread 106C: when support 4 moves forward, measure distance L 3; And when support 4 is mobile backward, measure distance L 4.Distance L 3 and L4 correspond respectively to first distance and the second distance in the claim.
Support 4 forwards to or backward directions arrive the end of electrode 2 after screw drive mechanism 106 continue under the situation of forwards or reverse rotation, screw thread 106C applies onesize power FA to protruding 4E, and moves irrelevant forward or backward with support 4.With distance L 3 multiply by power FA screw drive mechanism 106 axially on component F 1 calculate the moment that when support 4 moves forward, is applied on the 4F.Distance L 4 be multiply by component F 1 calculate the moment that when support 4 is mobile backward, is applied on the 4F.Therefore, and compare when support 4 moves forward, when support 4 was mobile backward, moment was bigger.Therefore, the deformation force that part 4D is applied is bigger, therefore, and compares when support 4 moves forward, and when support 4 was mobile backward, part 4D was easier to be destroyed.
When support 4 moves forward, the screw drive mechanism predetermined long enough time of 106 rotations.Prevent support 4 from moving backward like this and do not arrive the rear end of electrode 2, or prevent that support 4 from stopping under the situation of the front end that does not arrive electrode 2.Yet, might be after support 4 have arrived the rear end of electrode 2, screw drive mechanism 106 continues rotation, and protruding 4E repeatedly crosses screw thread 106C.Yet even when protruding 4E repeatedly crosses screw thread 106C, the less relatively deformation force that is applied to when support 4 moves forward on the part 4D still prevents to destroy part 4D, protruding 4E and screw drive mechanism 106, and prevents motor 8 overloads.
By contrast, when support 4 was mobile backward, sensor 9B detected the support 4 of the front end that arrives electrode 2, and sent detection signal, so that screw drive mechanism 106 stops the rotation.If when support 4 is mobile backward, arrived the rear end of electrode 2 at support 4 after screw drive mechanism 106 continue rotation, then relatively large deformation force will act on the part 4D.Yet what can not take place is: when support 4 was mobile backward, after support 4 had arrived the rear end, screw drive mechanism 106 continued rotation.Prevent to destroy part 4D, protruding 4E and screw drive mechanism 106 like this, and prevent motor 8 overloads.
As mentioned above, consider after support 4 has arrived the rear end size that when screw drive mechanism 106 continues rotation, is applied to the deformation force on the part 4D, determine to move forward the side that the protruding 4E of quilt of screw thread 106C when mobile backward contacts when support 4.When support 4 moved forward, motor 8 rotated all the time regular time and guarantees that support 4 moves to the rear end of electrode 2, arrives rear ends and need not to detect support 4.So just do not need sensor to detect support 4 in the rear end, thereby prevent the oversize of locking apparatus 1, and allow the drive controlling of the simplification of motor 8.The drive controlling of simplifying allows roller 5 with support 4 suitably to-and-fro movement and can not cause the insufficient cleaning or the breaking plant 1 of motor 2 between the front-end and back-end of electrode 2, and irrelevant with the Dust Capacity on the electrode 2.
As a kind of selection, motor 8 can be installed on the equipment 100.In this case, when device 1 or 101 when being installed on the equipment 100, screw drive mechanism 6 or 106 rear end mechanically are connected in the rotating shaft of motor 8.Can be at regular cleaning time, for example, when equipment 100 is powered up, perhaps after the imaging operation of having carried out pre-determined number, perhaps in time arbitrarily, for example, and when the user partly sends the cleaning instruction by guidance panel, actuating motor 8.
As a kind of selection, be arranged on electrode on device 1 or 101 and can include but not limited to needle electrode such as electrode 2.For example, this electrode can be a line electrode.Cleaning device in the claim can include but not limited to the rotor such as roller 5.For example, cleaning device can be a pair of liner that is bearing in the both sides of electrode.
Even now has been described the present invention, but clearly, can change the present invention in many ways.This change is not thought and has been broken away from the spirit and scope of the present invention, and the scope of following claim is intended to comprise conspicuous all this modifications for those skilled in the art.
Claims (11)
1. charging device comprises:
Linear electrode;
Cleaning device is mounted to this electrode of contact;
Rotatable screw drive mechanism is along the length location of this electrode;
Motor is used for this screw drive mechanism of forward and reverse rotation;
Support is used to keep this cleaning device, and this support is installed in non-rotatable mode, but this support can to-and-fro movement between first end of this electrode and second end; And
Protruding part begins to extend from this support perpendicular to the length of this electrode, and this protruding part has projection, and this projection is used for along in the thread groove that is coupled to this screw drive mechanism of the radial elastic of this screw drive mechanism,
Wherein this protruding part is configured such that distance between the contact point between the screw thread of starting point and this projection and this screw drive mechanism of elastic deformation of this protruding part moves forward according to this support or is mobile and different backward.
2. charging device according to claim 1,
Wherein,, the distance between the contact point between the screw thread of the starting point of elastic deformation of this protruding part and this projection and this screw drive mechanism is set according to the deformation angle of described protruding part when the elastic deformation,
This distance comprises:
First distance, when described support when described first end moves forward to described second end, measure this first distance; And
Second distance, when described support when described second end moves backward to described first end, measure this second distance.
3. charging device according to claim 1,
Wherein,, the distance between the contact point between the screw thread of the starting point of elastic deformation of this protruding part and this projection and this screw drive mechanism is set according to the moment on the starting point of the elastic deformation that is applied to this protruding part when the elastic deformation,
This distance comprises:
The 3rd distance, when described support when described first end moves forward to described second end, measure the 3rd distance; And
The 4th distance, when described support when described second end moves backward to described first end, measure the 4th distance.
4. charging device according to claim 2,
Wherein said first distance is longer than described second distance.
5. charging device according to claim 3,
Wherein said the 3rd distance is shorter than described the 4th distance.
6. according to claim 4 or 5 described charging devices, also comprise sensor, be used for detecting described support at described first end,
Wherein when described support is mobile backward, when described sensor arrives this support, this screw drive mechanism is stopped the rotation.
7. according to claim 2 or 3 described charging devices,
Wherein, when described support moved forward, this screw drive mechanism was rotated in the forward the schedule time.
8. charging device according to claim 7,
Wherein this schedule time is set to be equal to, or greater than when described electrode and acts on contact resistance on the described cleaning device when maximum, and described support moves forward to the time that described second end is spent from described first end.
9. according to claim 2 or 3 described charging devices,
Wherein:
This electrode is to have a needle electrode of lining up many pins of array along a direction, and
Described cleaning device is a rotor, and this rotor is held in by described support and makes that when this rotor is mobile with this support the tip of this pin is inserted the surface of this rotor in order and extracted out in order from the surface of this rotor subsequently.
10. electrophotographic image forming comprises:
According to claim 2 or 3 described charging devices; And
Photoreceptor, this photoreceptor is positioned to its surface towards this electrode.
11. imaging device according to claim 10,
Wherein this charging device is contained in this equipment, and first end face of this electrode is to the front side of this equipment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006199675A JP2008026646A (en) | 2006-07-21 | 2006-07-21 | Charging device, image forming apparatus and conveying screw mechanism |
| JP2006199675 | 2006-07-21 | ||
| JP2006203823 | 2006-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101114146A true CN101114146A (en) | 2008-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101373112A Pending CN101114146A (en) | 2006-07-21 | 2007-07-20 | Charging device and image forming apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2008026646A (en) |
| CN (1) | CN101114146A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096353A (en) * | 2009-12-14 | 2011-06-15 | 柯尼卡美能达商用科技株式会社 | Electrical device and image forming device therewith |
| CN102346405A (en) * | 2010-07-29 | 2012-02-08 | 夏普株式会社 | Electrostatic charger device and image forming apparatus |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008032854A (en) * | 2006-07-26 | 2008-02-14 | Sharp Corp | Charging device and image forming device |
| JP5659785B2 (en) | 2010-12-27 | 2015-01-28 | 富士ゼロックス株式会社 | Discharger and image forming apparatus |
| JP5766063B2 (en) * | 2011-08-05 | 2015-08-19 | キヤノン株式会社 | Charging device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001066914A (en) * | 1999-08-26 | 2001-03-16 | Canon Inc | Image forming device |
| JP2001343813A (en) * | 2000-06-01 | 2001-12-14 | Hitachi Koki Co Ltd | Corona discharge device for electrophotographic printing device |
| JP2008032854A (en) * | 2006-07-26 | 2008-02-14 | Sharp Corp | Charging device and image forming device |
-
2006
- 2006-07-21 JP JP2006199675A patent/JP2008026646A/en active Pending
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2007
- 2007-07-20 CN CNA2007101373112A patent/CN101114146A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096353A (en) * | 2009-12-14 | 2011-06-15 | 柯尼卡美能达商用科技株式会社 | Electrical device and image forming device therewith |
| CN102346405A (en) * | 2010-07-29 | 2012-02-08 | 夏普株式会社 | Electrostatic charger device and image forming apparatus |
| CN102346405B (en) * | 2010-07-29 | 2014-10-15 | 夏普株式会社 | Electrostatic charger device and image forming apparatus |
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| JP2008026646A (en) | 2008-02-07 |
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