CN202041770U

CN202041770U - Fixing device

Info

Publication number: CN202041770U
Application number: CN2011201158601U
Authority: CN
Inventors: 刘江
Original assignee: FOSHAN ESHENTE PRECISION FITTINGS Co Ltd
Current assignee: FOSHAN ESHENTE PRECISION FITTINGS Co Ltd
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2011-11-16
Anticipated expiration: 2021-04-19

Abstract

The utility model discloses a fixing device, which comprises a fixing roll and a pressure roll. A heating element is arranged in the fixing roll, the fixing roll and the pressure roll are in mutual pressure fit, a fixing roll gap portion is formed at the pressure fit position, a cleaning device is arranged on the outer peripheral surface of the fixing roll and arranged close to a transfer print medium input end, and the cleaning device is a scraper type cleaner or a roller type cleaner. By means of the technical improvement, the cleaner arranged on the peripheral surface of the fixing roll is used for clearing medium powder adhered from the transfer medium on the fixing roll, so that the surface of the fixing roll is cleaner with friction force maintained, fixation of the fixing roll is more precise, and images on the transfer medium are more vivid.

Description

Fixing device

Technical field:

The utility model relates to a kind of fixing device.

Background technology:

Electrophotographic image forming apparatus is meant and a kind ofly is used to utilize a kind of electric photographic imaging method to form the equipment of image on offset medium.The example of electrophotographic image forming apparatus comprises electricity photography duplicating machine, electrographic printer (for example, laser printer, LED printer etc.), facsimile recorder, word processor etc.

Usually, all be to adopt electrophotographic imaging forming apparatus to the photosensitive medium that is charged to a predetermined potential, to form an electrostatic latent image such as printing device such as laser printer, duplicating machine by scan light.Developer for example carbon dust offers electrostatic latent image via developing apparatus, and shows the image of developer, and this developer image is transferred on the offset medium of process image bearing medium and transfer roll.When offset medium when being in contact with one another the fixing roller of rotation and crimping place between the pressure roll, the developer image via heat and pressure fixing on this offset medium.In said process, influence developer on offset medium firmly degree be fixing roller.

Existing fixing device is made of fixing roller and pressure roll, both mutual crimping, form fusing nip portion, both are rotatably assorted mutually with opposite direction simultaneously, in daily use, fixing roller is owing to constantly contact with offset medium (for example printer paper), can affix one deck medium powder in its surface, cause fixing roller in rotating process with offset medium generation skidding, have a strong impact on the tidiness of toner image on the offset medium, the image after the photographic fixing can thicken unclear.

Summary of the invention:

The purpose of this utility model is in order to overcome the shortcoming of above-mentioned prior art, to provide a kind of fixing roller can not skid, the fixing device that fixing quality is high.

For achieving the above object, the technical scheme that the utility model provides is: fixing device, include fixing roller and pressure roll, be provided with heater element in the fixing roller, fixing roller and pressure roll are mutually press fit, crimping place forms fusing nip portion, is provided with cleaning device on the external peripheral surface of fixing roller.

For further improving the utility model, the applicant has done following improvement:

Described cleaning device is located near the offset medium input end.

Described cleaning device is the scraper-type clearer.

Described cleaning device is the drum-type clearer.

After above-mentioned technological improvement, utilize the clearer of being located on the fixing roller circumferential surface, the medium powder that offset medium from fixing roller is adhered to cleans out, the fixing roller roll surface is comparatively cleaned, keep its friction force, make the fixing roller photographic fixing more accurate, the image on the offset medium is more clear.

Description of drawings:

Fig. 1 is the structure principle chart of the utility model electrophotographic image forming apparatus;

Fig. 2 is that the utility model electrophotographic image forming apparatus protecgulum is opened the structural drawing when exposing handle box;

Fig. 3 is the handle box structural drawing of the utility model electrophotographic image forming apparatus;

Fig. 4 is the structural drawing that the utility model electrophotographic image forming apparatus fixing device adopts the scraper-type clearer;

Fig. 5 is the structural drawing that the utility model electrophotographic image forming apparatus fixing device adopts the drum-type clearer.

Embodiment:

Hereinafter, preferred embodiment of the present utility model is described with reference to the accompanying drawings.

(1) general structure of imaging device

Fig. 1 is the vertical cross-section diagram of the polychrome imaging device in the utility model preferred embodiment, shows its general structure.This polychrome imaging device is a kind of panchromatic laser beam printer that uses the electric photographic process of transfer printing type, and has used a plurality of handle boxes that are installed on removably in its box chamber.It has the handle box chamber, and a plurality of therein handle boxes are in fact vertically stacked in a parallel manner.

The master component (hereinafter it being abbreviated as the equipment master component) of Reference numeral 100 expression imaging devices, and the protecgulum (abbreviating it as protecgulum hereinafter) of Reference numeral 101 indication equipments.This protecgulum 101 is articulated on the equipment master component 100, thereby it can open or close by the rotation around the hinge axis 101a that is arranged in protecgulum 101 bottom margin places.In Fig. 1, protecgulum 101 is closed with respect to equipment master component 100, and in Fig. 2, protecgulum 101 has been opened towards the operator, has exposed opening 91, by this opening 91 handle box is inserted in the equipment master component 100.

Reference numeral

7a, 7b, 7c and 7d represent four handle boxes (abbreviating it as box hereinafter), promptly, be used to form first to the 4th box of magenta, cyan, yellow and black toner image, it is corresponding to the color composition that optical imagery was separated into of required full-colour image.These boxes 7 are stacked in the box chamber of equipment master component 100 abreast along the direction with true vertical direction slight inclination, and are stacked with the order of listing above, and wherein box 7a is disposed in the bottom.

Each box 7 (a-d) all has the drum-type electric camera photosensitive member (as the photosensitive drums of abbreviating hereinafter) as image bearing member 1 (a-d).It also has so electric photography processor, such as the charging equipment (charging device) 2 (a-d) that is used for to the circumferential surface uniform charging of photosensitive drums 1, be used for by toner is attached on the electrostatic latent image and will be formed on the developing apparatus (developing apparatus) 4 (a-d) that latent electrostatic image developing on the circumferential surface of photosensitive drums 1 is toner image (image that is formed by toner), the cleaning equipment (cleaning device) 6 (a-d) that is used to remove the toner on the circumferential surface that remains in photosensitive drums 1 after being used on toner image being transferred to offset medium (recording medium), or the like.

The developer that is stored in the developing apparatus 4 (a-d) of first to the 4th box 7 (a-d) is respectively magenta, cyan, yellow and black toner.

Reference numeral

3a, 3b, 3c and 3d represent and four boxes 7, four scanner devices one to one.Scanner device 3 is on a kind of circumferential surface that is used for the uniform charging by laser beam (imaging light) L being projected photosensitive drums 1 and form the exposure device of electrostatic latent image on the circumferential surface of photosensitive drums 1.More particularly, the laser beam L from the output of laser diode (not shown) in by the imaging data modulation reflects (deflection) by polygonal mirror 9 (a-d), and described polygonal mirror 9 (a-d) is by scanner motor (not shown) high-speed rotation.The laser light reflected bundle L of institute is sent out by imaging len 10 (a-d), focuses on thus on the circumferential surface of uniform charging of photosensitive drums 1.Therefore, make a plurality of somes exposure of circumferential surface of the uniform charging of photosensitive drums 1 selectively, on the circumferential surface of photosensitive drums 1, form electrostatic latent image.

Partition 93 in the Reference numeral 93 indication equipment master components 100.It will wherein be equipped with the box chamber of four boxes 7 (a-d) and separate with the scanner device chamber that wherein is furnished with four scanner devices 3 (a-d).Pass through corresponding window 95 (promptly from the laser beam L of each scanner device 3 (a-d) output, in the window that partition 93 is provided with one) enters in the corresponding box 7, and scan the circumferential surface of corresponding photosensitive drums 1, make a plurality of some exposures of the circumferential surface of photosensitive drums 1 selectively.

Reference numeral 5 expression be the static printing equipment (static printing device) that is contained on the inboard of protecgulum 101.Therefore, protecgulum 101 is opened or closed with respect to equipment master component 100 (Fig. 2) with static printing equipment 5.Static printing equipment 5 is provided with static printing band 11, and after protecgulum 101 was closed with respect to equipment master component 100, described static printing band 11 drove in the mode that all photosensitive drums 1 with first to the 4th box 7 contact with being recycled.What

Reference numeral

12a, 12b, 12c and 12d represented is four transfer rolls, described transfer roll is disposed in the ring that forms with static printing band 11 and is so arranged, even static printing band 11 retaining clips are between the photosensitive drums 1 and static printing band 11 of first to the 4th box 7 (a-d).

Reference numeral 16 expression be the offset medium transport portion that is arranged in the bottom of equipment master component 100.It is a part that is used for offset medium S is flowed to the static printing band 11 of static printing equipment 5.Reference numeral 17 expression be that the paper feeding cassette of offset medium transport portion 16 wherein stores a plurality of offset medium

S.Reference numeral

18 and 19 is respectively paper feed roller (half-cylindrical roller) and a pair of registration roller.

Reference numeral 20 expression be the fixing device that is arranged in the top of equipment master component 100.It will be transferred to the different a plurality of toner image of color on the offset medium S on offset medium S.It has fixing roller 21a, keep being pressed in fixing roller 21a goes up with the pressure roll 21b that exerts pressure to offset medium S etc.Reference numeral 23 and 24 expressions be a pair of distributing roller and in order to receive the delivery tray part of the offset medium S that has just formed image on it.

Under the predetermined timing of imaging sequence, first to the 4th photosensitive drums 1 in the box 7 sequentially rotated along the counter clockwise direction shown in the arrow.Subsequently, scanner device 3 (a-d) is sequentially driven with the rotational synchronization ground of the photosensitive drums 1 of corresponding box 7.And the peripheral speed that matches with the peripheral speed with photosensitive drums 1 is driven the static printing band 11 of static printing equipment 5 circularly along the clockwise side shown in the arrow by driven roller 13.

When making each photosensitive drums 1 aforesaid rotation, its circumferential surface is charged equably (elementary charging) to predetermined polarity (being negative polarity in the present embodiment) and potential level by charging equipment 2 (a-d).The circumferential surface that has charged of photosensitive drums 1 be exposed to by in the imaging data modulation under the laser beam L of scanner device 3 outputs.Therefore, on the circumferential surface of photosensitive drums 1, form and the corresponding electrostatic latent image of imaging data.

By developing apparatus 4 latent electrostatic image developing (utilize the toner discharged-area development, in the present embodiment, the intrinsic polarity of this toner is for negative) is become toner image (image that is formed by toner).Therefore, regularly the toner image of magenta, cyan, yellow and black is respectively formed on the circumferential surface of photosensitive drums 1 of first to the 4th box 7 (a-d) with predetermined sequence control.

Simultaneously, the donor rollers 18 of offset medium transport portion 16 is driven in rotation under predetermined sequence control regularly, when offset medium S is separated one by one it is fed to the equipment master component 100 from paper feeding cassette 17.When the front end of each offset medium S was transferred, it contacted with the clamp area that is formed by the paired registration roller 19 that does not rotate.When it when paired registration roller 19 contacts, it temporarily keeps stand-by, upwards arches upward.Then, registration roller 19 beginning is moved with the circulation of static printing band 11 and the synchronized movement ground of the line of the circumferential surface of photosensitive drums 1 is driven in rotation, and begins to write at this moment toner image.Therefore, offset medium S is transported to jockey pulley one side of the side that moves up of static printing band 11, and make its Electrostatic Absorption on the surface of static printing band 11 by spontaneous electrostatic force in static printing band 11, thus offset medium S is remained on the static printing band 11 reliably.Then, by moving of static printing band 11, S is transported to transfer station with offset medium, or the workstation in downstream.Offset medium transport portion 16 can be provided with charging device, such as the static adhesive roller etc., be used for wittingly for offset medium S and/or 11 chargings of static printing band so that make offset medium S Electrostatic Absorption at static printing band 11.

When being transported as described above, offset medium S stratification ground order receives the toner image on the circumferential surface that is formed on photosensitive drums 1; Be transferred on the recording medium S by the toner image stratification ground order that on the electric field that forms between photosensitive drums 1 and the corresponding transfer roll 12 will the circumferential surface in the photosensitive drums 1 of first to the 4th box 7, forms.In the present embodiment, bias voltage with positive polarity is applied on each transfer roll 12, thereby positive charge is put on the offset medium S by static printing band 11, produced electric field, during the image transfer operation, this electric field just is transferred to the toner image of the positive polarity on the photosensitive drums 1 with on the offset medium S that is transferred with the contacted mode of photosensitive drums 1 (a-d).

More particularly, make offset medium S Electrostatic Absorption on the surface of static printing band 11, keep thereon, and upwards carry by the rotation of static printing band 11.When upwards carrying offset medium S by static printing band 11 as described above, this offset medium S stratification ground order is received in magenta, cyan, yellow and the black toner image that forms on the circumferential surface of photosensitive drums 1 of first to the 4th box 7; It receives a toner image in each transfer station.Therefore, the synthetic not full-color toner image of photographic fixing on the surface of recording medium S.

Stratification received four different toner images of color after, the bending of the driven roller 13 by offset medium transport portion 16 is separated offset medium S and static printing band 11, and is transported in the fixing device 20.In fixing device 20, offset medium S is transferred by by the fixing roller 21a that rotates with the photographic fixing clamp area that forms of the pressure roll 21b that rotates on being crushed on fixing roller 21a.Therefore, by being applied to heat on the offset medium S a plurality of toner image color is different with pressure by paired

roller

21a and 21b to offset medium S, for fixing roller 21a in the long-term process of using, friction force between energy maintenance and the offset medium S, side at the close offset medium S input end of fixing roller 21a is provided with clearer, this clearer can be scraper-type clearer 21c (as shown in Figure 4), also can be drum-type clearer 21d (as shown in Figure 5).Be in the described fixing device 20 after toner image is to offset medium S, the image load-bearing surface of offset medium S towards below situation under, by paired distributing roller 23 offset medium S is discharged in the outside delivery tray 24 of equipment master component 100.

Residue such as the toner on each the circumferential surface of photosensitive drums 1 that remains in first to the 4th box 7 etc. after toner image is transferred on the offset medium S is removed by cleaning equipment 6, and photosensitive drums 1 is used for ensuing imaging operation.

(2) handle box 7

Fig. 3 is the cross-sectional view of the amplification of box 7.

In this embodiment, photosensitive drums 1 is a whole ingredient of box 7, therefore, when being installed in box 7 in the equipment master component 100 removably, with photosensitive drums 1 removably in equipment master component 100.

In the following description of this embodiment, the Width of box 7 or its structure member be parallel to box 7 is installed in the equipment master component 100 or when wherein removing along the direction of direction, and vertically be meant and box 7 be installed in the equipment master component 100 or from the direction of the direction traversed by (vertical) that wherein takes out.The front side of box 7 be meant box 7 in the face of box 7 is inserted in the equipment master component 100 direction or towards the side of its direction of taking out in box 7 slave unit master components 100: in other words, it be box 7 have the side of photosensitive drums of making 1 by the hole of its box that exposes 7.The rear side of box 7 is meant the side relative with the front side.The left side of box 7 and right side are meant left side and the right side when the front side of box 7 is seen.The top side of box 7 and bottom side are meant the side that will lay respectively at top side and bottom side after box 7 being installed in the equipment master component 100.

The developer in the toner container part (developer storage compartment) of the developing apparatus 4 (a-d) that is stored in first to the 4th box 7 (a-d), first to the 4th box 7 (a-d) (structurally) is identical; The toner container part of first to the

4th box

7a, 7b, 7c and 7d accommodates magenta toner, cyan toner, Yellow toner and black toner respectively.

Box 7 is made of cleaner unit 50 and developing cell 4A.Cleaner unit 50 comprises photosensitive drums 1, charging device 2 and cleaning device 6, and developing cell 4A comprises the developing apparatus that is used to make the latent electrostatic image developing on the circumferential surface that is positioned at photosensitive drums 1.

Cleaner unit 50 also comprises framework 51, the elementary charging equipment 2 of photosensitive drums 1, the photographic layer that is used to photosensitive drums 1 or outermost layer uniform charging is installed, as the cleaning doctor 60 of the cleaning device 6 that is used for the developer (residual toner) on the circumferential surface that the image transfer printing after removing remains in photosensitive drums 1 and flex plate 80 etc. on it.

The contact-type charging equipment can be used as charging equipment 2.Charging member is a conductive rollers, and its circumferential surface is arranged to contact with the circumferential surface of photosensitive drums 1.This roller rotates by the rotation of photosensitive drums 1.When the rotation by photosensitive drums 1 is rotated described roller, make the circumferential surface of photosensitive drums 1 by uniform charging by apply the charging bias voltage to described roller.

By cleaning doctor 60 residual toner (used toner) is removed from the circumferential surface of photosensitive drums 1, and the residual toner of removing is stored in the used toner chamber (residual toner apotheca) 54 that is arranged in cleaning doctor 60 tops.Incidentally, after the toner image transfer printing, remain in toner on the circumferential surface of photosensitive drums 1 and move through contact area between the circumferential surface of flex plate 80 and photosensitive drums 1, and arrive cleaning doctor 60 places.Flex plate 80 is contained on the cleaning unit framework 51, so that preventing that residual toner from spilling cleaning unit framework 51 by cleaning doctor 60 after the circumferential surface of photosensitive drums 1 gets on except residual toner.

Developing cell 4A comprises: development sleeve 40, and it is rotated (along direction shown in the arrow among Fig. 3), and keeps a minim gap by a pair of interval turns 40a between the circumferential surface of the circumferential surface of development sleeve 40 and photosensitive drums 1; And developing device frame 45a and 45b, wherein store toner.Developing device frame 45a is connected by ultrasonic soldering or similar approach with 45b, forms container unit 46.Support development sleeve 40 by a pair of bearing that is arranged between development sleeve 40 and the unit 46 rotationally by developing apparatus container unit 46.Near the circumferential surface of development sleeve 40, be furnished with the toner feed rolls 43 and the developing blade 44 that rotate in contact along circumferential surface by indicated clockwise direction of arrow and development sleeve 40.And, in the toner container of developing apparatus container unit 46 part (developer storage compartment) 41, be furnished with the toner transport establishment 42 that the toner (not shown) that is used for will being stored in toner container part 41 when stirring is transported to toner feed rolls 43.

Developing cell 4A is provided with a pair of connecting hole 47, they are arranged in the longitudinal end place of container unit 46 in man-to-man mode, and the cleaner unit framework 51 of cleaner unit 50 is provided with a pair of supported hole 52, and this supported hole 52 is positioned at the longitudinal end place of cleaner unit framework 51.These two unit are kept connecting hole 47 and supported hole 52 are aimed at one by one in, insert developing cell 4A and cleaner unit 50 interconnected by pair of pin 49 being passed connecting hole 47 and supported hole 52.Therefore, the integral body of developing cell 4A becomes and can rotate around pin 49, thus can be with respect to cleaner unit 50 motions when maintenance is suspended from cleaner unit 50.And, make developing cell 4A keep pressurized by a pair of spring (not shown) along the direction that developing cell 4A is rotated around pin 49, thereby keep the interval turns 40a of development sleeve 40 to contact with photosensitive drums 1 in the cleaner unit 50.

During development operation, the toner in the toner container 41 is transported to toner feed rolls 43 by rabbling mechanism 42, and this toner feed rolls 43 is rotated just along clockwise direction, and contacts with the development sleeve 40 that rotates equally just along clockwise direction.Therefore, the circumferential surface friction of the circumferential surface of feed rolls 43 and development sleeve 40 makes that the toner on the circumferential surface that is positioned at feed rolls 43 is transferred on the circumferential surface of development sleeve 40.The rotation of toner by development sleeve 40 that has been carried on the circumferential surface of development sleeve 40 is brought to developing blade (toner layer adjustment means) 44 places.Therefore, along with the further rotation of development sleeve 40, will be the thin uniformly toner layer of thickness in the thickness adjusted of the toner layer on the circumferential surface of development sleeve 40 by developing blade 44, be endowed the electric charge of scheduled volume simultaneously.Then, by the further rotation of development sleeve 40, take the thin toner layer on the circumferential surface of development sleeve 40 to the station of developing, wherein the distance between photosensitive drums 1 and development sleeve 40 is minimum.In the station of developing, the toner from the thin toner layer on the circumferential surface that is positioned at development sleeve 40 is attached on the electrostatic latent image on the circumferential surface of photosensitive drums 1 by the development bias voltage that puts on from the power supply (not shown) on the development sleeve 40; In other words, sub-image is developed.More particularly, on a plurality of points that the potential level of development sleeve 40 by toner being transferred to electrostatic latent image is lower and on the circumferential surface of photosensitive drums 1, form (development) toner image.

The toner that is not used for image development, promptly, the further rotation of toner by development sleeve 40 that remains on the development sleeve 40 turns back in the container unit 46, wherein,, residual toner is removed from development sleeve 40 mutually in the zone of mutual friction at the circumferential surface of the circumferential surface of feed rolls 43 and development sleeve 40 by feed rolls 43; In other words, residual toner is recycled in the container unit 46.By rabbling mechanism 42 toner of recovery is mixed in the toner in the container unit 46.

What Reference numeral 53 was represented is the optical gate that is used to protect photosensitive drums 1.Described optical gate 53 is contained on the cleaner unit framework 51.It can be arranged in the off-position (Fig. 3) of the photosensitive drums exposal window on box 7 front sides and it in its covering by the shutter mechanism (not shown) and move move down with the open position (double dot dash line of Fig. 3 is indicated) that exposes the photosensitive drums exposal window from off-position between.In the time of outside box 7 is in equipment master component 100, optical gate 53 is maintained on the off-position, protects the part of the circumferential surface of photosensitive drums 1 thus, if this optical gate 53 not, then described part will keep exposing.After being installed on box 7 in the equipment master component 100, when the protecgulum 101 of equipment master component 100 is closed, make optical gate 53 move to open position by the shutter mechanism (not shown) of the motion campaign by protecgulum 101.Therefore, can static printing band 11 be arranged to contact (Fig. 1) with the circumferential surface of photosensitive drums 1 by the aforementioned exposal window of box 7.

What Reference numeral 90 was represented is can be at the handle that uses when box 7 being installed in the equipment master component 100 or take out in its slave unit master component 100.Here there are two from the outstanding forward handle 90 of the left and right longitudinal end of box 7.

The photosensitive drums structure of present embodiment as shown in Figure 4, include cylindrical base member 111, conductive layer 112, basalis 113, charge generating layer 114 and charge transport layer 115 on cylindrical base member 111, have been stacked gradually, on the surface of outermost charge transport layer 115, scribble metallic glass film 116, the surface of this metallic glass film 116 becomes micro concavo-convex trachytic texture (as shown in Figure 5), and the roughness of this micro concavo-convex asperities is Rz6.0～Rz6.5 μ m.

Described cylindrical base member 111 can be metallic matrix, also can be plastic substrate.

The metallic glass film of described metallic glass rete 116 for one of containing at least in Zr base, Ni base, Al base, Pd base, Mg base, Fe base, Co base or the Ti base.

The embodiment of the above is preferred embodiment of the present utility model only, is not to limit practical range of the present utility model with this, so the equivalence that all shapes according to the utility model, structure and principle are done changes, all should be covered by in the protection domain of the present utility model.

Claims

1. fixing device includes fixing roller and pressure roll, has been provided with heater element in the fixing roller, and fixing roller and pressure roll are mutually press fit, and crimping place forms fusing nip portion, it is characterized in that: be provided with cleaning device on the external peripheral surface of fixing roller.

2. fixing device according to claim 1 is characterized in that: described cleaning device is located near the offset medium input end.

3. fixing device according to claim 1 is characterized in that: described cleaning device is the scraper-type clearer.

4. fixing device according to claim 1 is characterized in that: described cleaning device is the drum-type clearer.