CN100397246C

CN100397246C - Image forming device with paper dust removing unit

Info

Publication number: CN100397246C
Application number: CNB021427143A
Authority: CN
Inventors: 普轮崎丈史; 服部慎; 福田和司
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2001-09-10
Filing date: 2002-09-10
Publication date: 2008-06-25
Anticipated expiration: 2022-09-10
Also published as: EP1291729A3; CN1409177A; EP1291729B1; EP1291729A2; HK1053358A1

Abstract

An image forming device capable of sufficiently removing paper dusts on a sheet thereby providing high quality image. A sheet transport path 38 is defined between a sheet supply section 7 provided with a separation pad 13 and a sheet supply roller 12 and an image forming section 5. Along the sheet supply section 7, at least a first paper dust removing roller 9b having a width slightly greater than the width of the separation pad 13 and a second paper dust removing roller 10b having a width slightly greater than the sheet width are disposed. Paper dusts generated upon friction against the separation pad 13 are removed by the first paper dust removing roller 9b, and paper dusts spreading over entire surface of the sheet are removed by the second paper dust removing roller 10b.

Description

Device for image forming with paper dust removing unit

Technical background

The present invention relates to a kind of device for image forming such as laser printer.

Device for image forming such as laser printer generally comprises the paper-supply section and the image forming part that is used for forming image on the paper of being supplied with by paper-supply section that are used to supply with paper.Paper-supply section generally comprises: a paper supply tray, a stacker are opened and are contained on this paper supply tray; A paper feed roller, this paper feed roller are positioned at an end of paper supply tray and are positioned at its top; And one with its separating pad in the face of being provided with.Along with the rotation of paper feed roller, be sandwiched between paper feed roller and the separating pad at the paper of the topmost on the paper supply tray, and be transported to the image forming part.

Image forming partly comprises a photosensitive drums, a charger, scanister, a developer roll and an image transfer roller, and these rollers are also in rotational direction located successively around photosensitive drums.Along with the rotation of photosensitive drums, charge equably by charger in the surface of photosensitive drums, and then, this surface is exposed in the laser beam of being launched by scanister, and carries out high-velocity scanning according to view data, thereby form an electrostatic latent image from the teeth outwards.Then, the toner that is carried on the developer roll is applied on the surface of photosensitive drums owing to the rotation of developer roll, thereby forms a visible toner image according to electrostatic latent image on the surface of photosensitive drums.Then, in the time of between paper is by photosensitive drums and image transfer roller, the toner image that is carried on the photosensitive drum surface is transferred on the paper that is provided by paper-supply section, like this, just can form a toner image on paper.

In device for image forming because every folder is fed between paper feed roller and separating pad, therefore since with the friction of separating pad, on paper, can produce paper dirt inevitably.Therefore, if this paper dirt is partly located to mix at image forming with toner, then picture quality can descend.

For fear of this problem, known method is to be provided with one to remove paper dirt roller in the upstream of paper feed roller.In order to remove the paper dirt on the paper before paper arrival image forming part, the width that removes paper dirt roller roughly equates with the width of separating pad.Yet because cut paper, paper dirt just had been present on the whole surface of paper originally.Therefore, only be difficult to original paper dirt is removed by its width paper dirt roller that removes identical with the width of separating pad.

As long as it is identical with the width of paper to remove the width that paper dirt roller has, original paper dirt that produces and because can be by removing the removal of paper dirt roller with the paper dirt that friction produced of separating pad.Yet the quantity of the paper dirt that friction is produced to separating pad is more than original amount that produces.Therefore, even use the paper dirt roller that removes to remove paper dirt with paper width, paper dirt still can not be removed equably, but removes that uneven situation occurs in because between the zone and the original zone that produces of paper dirt to the paper dirt that friction produced of separating pad.Therefore, can not realize removing equably paper dirt.

In addition, in order to remove the paper dirt that is positioned at from the paper of supplying with part, a plurality of paper dirt rollers that remove can be set along the paper supply path.Yet, remove paper dirt roller for each and be provided with a paper dirt conveyer and a paper dirt accumulator, be used to transport and accumulate remove the paper dirt that paper dirt roller is removed by each.Therefore, it is very complicated that total just becomes, and mechanism assembly and part increase, and this will cause the device for image forming volume big and cost is high.

Summary of the invention

Therefore, one object of the present invention is to overcome above-mentioned shortcoming, provides a kind of and can be effectively removes paper dirt and the device for image forming of high quality graphic is provided from paper.

Another object of the present invention is to provide a kind of like this device for image forming, and this device for image forming has the simple plan of establishment and can reduce the quantity of mechanism element, but still can remove paper dirt fully by a plurality of paper dust removing units.

Another purpose of the present invention is to provide a kind of like this device for image forming, this device for image forming can by paper dirt conveyer stable transport the paper dirt of removing by paper dust removing unit, thereby for a sufficient paper dirt accumulation space is set below paper dust removing unit, guaranteeing has enough distance of fall between paper dirt unit and the paper dirt conveyer.

Another purpose of the present invention is to provide a kind of like this device for image forming, this device for image forming can prevent to be turned back to once more in the sheet conveying path by the paper dirt that paper dust removing unit absorbs, thereby avoids paper dirt to mix with developer as toner and so in the image forming operation that carry out in the downstream of paper dust removing unit.

These and other purpose of the present invention will realize that this device comprises a paper-supply section, an image forming part, a sheet conveying path and at least two improved paper dust removing units by a kind of device for image forming that is used on image recording media forming image is provided.Paper-supply section comprises a paper feed roller and a separating pad, is used for every image recording media of grip(per) feed between them.Image forming partly is applicable on the image recording media of being supplied with by paper-supply section and forms an image.Partly extend to image forming from paper-supply section in the sheet conveying path, and formed a paper supply direction.At least two paper dust removing units comprise one first paper dust removing unit and one second paper dust removing unit.First paper dust removing unit is arranged in the other position of sheet conveying path and can contacts with image recording media, and this first paper dust removing unit is used for removing paper dirt from the image recording media that partly moves along the sheet conveying path towards image forming.Second paper dust removing unit is arranged in the other position of sheet conveying path, and this position is different about the position of paper supply direction with first paper dust removing unit, this second paper dust removing unit also contacts with image recording media, is used for equally removing paper dirt from the image recording media that partly moves along the sheet conveying path towards image forming.

In a preferred embodiment, first paper dust removing unit comprises that one first is removed paper dirt member, this member at image recording media along being in contact with it in the motion process in sheet conveying path, and second paper dust removing unit comprises that one second is removed paper dirt member, this member at image recording media along being in contact with it in the motion process in sheet conveying path.First to remove the width vertical with the paper supply direction that paper dirt member has wideer slightly than the width of separating pad, and that second paper is removed the width vertical with the paper supply direction that the unit has is wideer slightly than the width of image recording media.

Device for image forming also is provided with a paper dirt accumulation part, and this part is used for therein removed from image recording media by at least two paper dust removing units and the paper dirt that then discharge from corresponding paper dust removing unit of accumulation with assembling.

In another aspect of the present invention, a kind of device for image forming that provides comprises image forming part, extends to the sheet conveying path of image forming part, one remove paper dirt member, a scraper member and the anti-reverse member that transports.Remove paper dirt member and contact, be used for from image recording media removal paper dirt in the face of location, sheet conveying path and with image recording media by it.Scraper member contacts with removing paper dirt member, is used for scraping off paper dirt from removing paper dirt member.Removing paper dirt member can be with forward identical with the paper supply direction and the reverse rotatably support opposite with forward.The anti-reverse member that transports is arranged between one first contact position and one second contact position, first contact position is formed on except that between paper dirt member and the image recording media, and second contact position is formed on except that between paper dirt member and the scraper member, and the anti-reverse member that transports is used for preventing from oppositely to transport towards the sheet conveying path from the paper dirt that scraper member discharges in the process of the reverse rotation that removes paper dirt member.

In another aspect of the present invention, a kind of device for image forming is provided, and this device comprises that image forming part, one are used for removing paper dust removing unit, a paper dirt delivery unit and a control wall of paper dirt from being fed into image recording media that image forming partly gets on.Paper dirt delivery unit is provided with lowlyer than first paper dust removing unit, and this delivery unit is used for transporting the paper dirt that falls from paper dust removing unit along paper dirt carriage direction.The control wall is arranged on the part place of paper dirt delivery unit, and it is used for adjusting paper dirt stream.

Description of drawings

In the accompanying drawings:

Fig. 1 shows the sectional view of the major part of laser printer according to an embodiment of the invention;

Fig. 2 is the sectional view of the amplification in the sheet conveying path in the laser printer that shows Fig. 1 especially;

Fig. 3 (a) is the planimetric map of a paper;

Fig. 3 (b) transports the front elevation that one second in the part removed paper dirt roller for showing second, and this view is observed from the arrow A of Fig. 2;

Fig. 3 (c) is for showing the sectional view that removes paper dirt roller according to one first of first embodiment of the invention;

Fig. 3 (d) is for showing the planimetric map according to a pad member of first embodiment of the invention;

Fig. 4 shows the amplification sectional view that first of laser printer among Fig. 1 transports part;

Fig. 5 shows first of Fig. 4 to transport the amplification sectional view of a kind of variation of part;

Fig. 6 for illustrate with partial cross section one first in the laser printer of Fig. 1 remove paper dirt roller, a control wall and a spiral propeller member front elevation;

Fig. 7 shows the planimetric map that centers on the major part of spiral propeller member in the laser printer of Fig. 1;

Fig. 8 is the sectional view that shows the gear drive that is provided with adjacent to the sheet conveying path of the laser printer shown in Fig. 1;

Fig. 9 is the amplification sectional view that shows according to the sheet conveying path of the laser printer of second embodiment of the invention;

Figure 10 shows the sectional view that removes paper dirt roller according to one second in the laser printer of second embodiment of the invention;

Figure 11 shows the sectional view that transports the major part of part and transmission drive part according to the paper dirt in the laser printer of second embodiment;

Figure 12 shows the front elevation that transports part according to the paper dirt of the laser printer of second embodiment;

Figure 13 (a) is for showing the sectional view according to the power transmission mechanism of the laser printer of second embodiment of the invention;

Figure 13 (b) is the front elevation that shows the power transmission mechanism of Figure 13 (a); And

Figure 14 shows the synoptic diagram that a pair of second of modification embodiment of the present invention removes the relation between paper dirt roller and the image recording media.

Embodiment

The device for image forming of 1 to the 8 narration first embodiment of the present invention wherein shows electro photography type laser printer 1 in conjunction with the accompanying drawings.

(1) general layout and image forming operation

As shown in Figure 1, printer 1 comprises: a main casing 2; One feeder part 4, this feeder partly are used for feeding one paper 3 as image recording media; And an image forming part 5, this image forming partly is used for forming image on the paper 3 of feeding.Feeder part 4 and image forming part 5 are installed in the housing 2.

Feeder part 4 comprises: a paper supply tray 6, and this paper supply tray is placed on the bottom of main casing 2, and can be from this separately; One paper-supply section 7, this paper-supply section are arranged on a side of paper supply tray 6; One is arranged on the paper installing plate 8 in the paper supply tray 6; One first transports part 9 (one first paper dust removing unit); One second transports part 10 (one second paper dust removing unit); An and alignment roller 11.Transport the downstream that

part

9 and 10 is arranged on paper-supply section 7 along the paper feed direction with first and second.Alignment roller 11 is arranged on first and second downstreams of transporting

part

9,10.

Paper supply tray 6 is and has the box-like of opened upper end structure, opens 3 so that hold a stacker therein.Paper supply tray 6 can be with respect to the basal sliding of main casing 2, so that pallet 6 can be from housing 2 separately.

Paper-supply section 7 comprises a paper feed roller 12 and a separating pad of facing with it 13.As shown in Figure 2, separating pad 13 comprises a scaffold 13a, a pad member 13b and a spring 13c.

Scaffold 13a has roughly L-shaped cross section, and it comprises: a flat part, and this flat part is placed with the below near paper feed roller 12; And a supporting part, this supporting part extends downwards from a lateral edges of flat part, and bends to a right angle with respect to flat part.The end portion of supporting part is pivotably connected to main casing 2.Pad member 13b is embedded in the surface of flat part, so that face with paper feed roller 12.Flat part has an apparent surface, and spring 13c is against on this surface, is used for promoting pad member 13b to paper feed roller 12.

13b is roughly rectangular for the pad member, and is made by the resilient material such as urethane rubber.Shown in Fig. 3 (a) and 3 (d), pad member 13b has a width B along the direction perpendicular to the paper feed direction, and this width is less than the width A of paper, and width A is the breadth extreme that bears the paper of laser printer 1 printing.Pad member 13b contacts the transverse center part of paper 3 at least, to be used for paper supply.

One paper installing plate 8 is suitable for installing a stacker thereon and opens.Paper installing plate 8 has the preceding free end that a rear end and that is pivotably connected to paper supply tray 6 can move in the vertical direction.The below of paper installing plate 8 is provided with a compression spring (not shown), is generally used for upwards promoting paper installing plate 8.Therefore, if the quantity that the stacker on the paper installing plate 8 is opened increases, then the free end of paper installing plate 8 overcomes the biasing force of compression spring (not shown) around afterwards moving down to said pivot.Because therefore the biasing force of the compression spring related with paper installing plate 8 promotes the top paper 3 that the stacker on the paper installing plates 8 is opened to paper feed roller 12.When paper feed roller 12 rotations, the fore-end of the top paper is clipped between paper feed roller 12 and the pad member 13b.In this kind mode, from a stacker is opened, separate the paper of every the top and transmit this paper.

By the way, paper-supply section 7 adopts friction/piece-rate system, and following friction force relation is provided in the paper supply timing.That is to say that the friction force between paper feed roller 12 and the paper 3 is greater than the friction force between pad member 13b and the paper 3, the latter's friction force is greater than the friction force between the paper that piles up.

First and second methods of transporting

part

9 and 10 that will narrate with the back are sent to alignment roller 11 by the sheet conveying path 38 between paper-supply section 7 and the image forming part 5 with paper.Alignment roller 11 comprises a pair of roller that is used to proofread and correct the oblique feeding of paper 3, so that in correct orientation paper 3 is being fed into image forming part 5.

Image forming part 5 comprises one scan device part 17, a processing unit 18 and a fixed part 19.Scanner part 17 is arranged on the upper interior of main casing 2, and comprises polygon mirror 20,

lens

21a and 21b and the catoptron 22 of a Laser emission part (not shown), a rotatable driving.According to view data emission of lasering beam from the Laser emission part, and by the high-velocity scanning irradiation on the surface of the photosensitive drums 23 of processing unit 18 of the optical path shown in the dot-and-dash line among Fig. 1, this optical path is limited by polygon mirror 20, lens 21a, catoptron 22 and lens 21b.

Processing unit 18 is arranged on the below of scanner part 17, and is configured to and can separates with main casing 2.Processing unit 18 comprises a drum box and a Delevoping cartridge 24.Accommodate a photosensitive drums 23 as Electrifier frame, photoreceptor, an image transfer roller 25 and scott Lu Teken (scorotoron) charger 37 in the drum box.Delevoping cartridge 24 can separate with the drum box, and wherein accommodates a toner funnel 26, developer roll 27, toner layer thickness adjusting blade 28 and a toner donor rollers 29.

In toner funnel 26, filling can be filled the nonmagnetic single component type polymerized toner of positive charge as developer.By toner donor rollers 29 this toner is supplied to developer roll 27, and since its friction slip of adjusting blade 28 with toner layer thickness concern, with this toner bearing on developer roll 27 as the constant toner layer of minimal thickness.On the other hand, photosensitive drums 23 rotatably is arranged to the relation faced with developer roll 27.Photosensitive drums 23 comprises that ground connection drum body and can fill the photographic layer of positive charge, and the photographic layer that can fill positive charge is to be made by the polycarbonate that is formed on bulging body top.

Rotate along the direction shown in the arrow according to photosensitive drums 23, make the surface of drum 23 have positive polarity equably by scott Lu Teken charger 37, and be subjected to therefore on photosensitive surface, forming electrostatic latent image according to the irradiation of print data from scanner part 17 high speeds scanning emitted laser bundle.Yet, according to the rotation of developer roll 27, the toner that is carried on the pipe 27 that develops and have positive polarity being offered the expose portion of photosensitive drums 23, the potential level of expose portion is lower than the remainder of the photosensitive drum surface that evenly has positive charge.Thereby, on photosensitive drums 23, form visible toner image, develop to finish inverted image.

Transfer roller 25 is near the below of photosensitive drums 23.Transfer roller 25 comprises that one is made of metal and is connected turning axle and on the power supply and is formed on conductive rubber layer on the turning axle.One predetermined transmission bias-voltage is applied on the turning axle, is used for toner is transferred to paper 3 from photosensitive drums 23.In the time of between paper 3 is by photosensitive drums 23 and transfer roller 25, visible toner image is transferred on the paper 3, by moving belt 30 paper is sent to fixed part 19 then.

Fixed cell 19 is positioned at the next door of processing unit 18 and the downstream of processing unit 18.Fixed cell 19 comprises that a warm-up mill 31, a pressure roll 32 and that contacts with warm-up mill 31 pressure are positioned at the feed rolls 33 in the downstream of warm-up mill 31 and pressure roll 32.Warm-up mill 31 is made of metal, and is provided with a Halogen lamp LED as thermal source.When the paper that has image passes through warm-up mill 31 and pressure roll 32, will be fixed to paper 3 in the toner image of processing unit 18 places transfer printing on paper 3 with the heating power mode.Then by feed rolls 33 with paper 3 be sent to feed rolls 34 the downstream, be arranged on the discharging roller 35 in the main casing 2.Be discharged on the discharging pallet 36 by the paper 3 of discharging roller 35 34 feedings of downstream feed rolls.

In laser printer 1, after transfer drum 25 is transferred to paper 3 with toner, collect the residue toner that remains on the photosensitive drum surface by developer roll 27.This toner collection mode is called as the system (cleaner-less system) that does not have clearer, wherein can exempt being used to wipe the blade of residue toner and the container of residue toner, with the integral body setting of simplified image building mortion.

One paper recycle unit 41 is set, is used on two surfaces of paper 3, forming image.Recycle unit 41 comprise paper commutation part 42 and one with recycle pallet 43 of its whole formation.Recycle unit 41 is positioned at the rear wall of main casing 2, makes paper commutation part 42 be attached in the rear wall next door by some way, and is packed in the rear wall of one position, top of feeder part 4 in recycle pallet 43 separable insertions ground.

Paper commutation part 42 has a housing 44, and this housing has a square-section, and is attached on the rear wall of main casing 2.In housing 44, be provided with a clack valve 45, reversing roller 46 and recycle roller 47.In addition, a commutation guide plate 48 extends upward from the upper end of housing 44.Clack valve 45 is arranged on the rear portion of main casing 2 pivotly, and is positioned at the downstream of feed rolls 33.When the solenoid (not shown) was energized with de-energisation, clack valve 45 was pivoted, and the single face that is used for changing feed rolls 33 feedings has the direction of feed of the paper 3 of image, moves to the reversing roller 46 shown in downstream feed rolls 34 shown in the solid line or the dotted line.

Reversing roller 46 comprises pair of rolls, and is positioned at the downstream of clack valve 45 and the top of housing 44.The sense of rotation of reversing roller can be along forward and inverse change.Reversing roller 46 is at first along being rotated in the forward, so that to commutation guide plate 48 guiding paper 3, then along reverse rotation, so that along oppositely transporting paper 3.

Recycle roller 47 is positioned at the downstream of reversing roller 46, and directly is under this reversing roller in housing 44.Recycle roller 47 comprises pair of rolls, so that to the paper 3 of recycle pallet 43 guiding by reversing roller 46 reverse drive.Commutation guide plate 48 constitutes from the upwardly extending tabular component of the upper end of housing 44 by one, and this member is used to guide moving by the paper 3 of reversing roller 46 feedings.

For print image on the back side of the paper 3 that formed image in the front, in paper commutation part 42, clack valve 45 is transformed into can be to the position of paired reversing roller 46 feeding paper 3.Thereby the positive paper 3 that has formed image is received in the paper commutation part 42.After paper 3 arrives reversing roller 46,, be used for temporarily upwards discharging paper along commutation guide plate 48 along being rotated in the forward reversing roller 46.When the major part of paper 3 is sent housing 44, and the end section of paper 3 stops to be rotated in the forward of paired reversing roller 46 when being sandwiched between the paired reversing roller 46.Then, the reversing roller 46 that reverse rotation is paired is so that paper 3 feeds downwardly into paired recycle roller 47.One paper sensor 56 that will be used to detect paper 3 is arranged on the downstream of fixed part 19.The sense of rotation that control one is used to make reversing roller 46 from be rotated in the forward change to reverse rotation commutation regularly regularly begin through after the predetermined period so that commutation regularly occurs in the detection that detects the back edge of paper 3 from paper sensor 56.In addition, when paper feed when the action of reversing roller 46 is finished, clack valve 45 is transformed into its initial posture, that is, make paper be fed into the posture of downstream feed rolls 34 from feed rolls 33.Then, the paper 3 with paired recycle roller 47 feed reversings is sent to recycle pallet 43 by paired recycle roller 47.

Recycle pallet 43 has a paper receiving part 49, a pallet 50 and oblique feed rolls 51.Paper receiving part 49 is attached on the main casing 2 in the lower position outside of paper commutation part 42, and has an arc paper guide 52.Curvature from the downward paper of paired recycle roller 47 approximate vertical along paper guide 52 in the direction of approximate horizontal towards pallet 50 orientations.

Pallet 50 has the shape of similar rectangular slab, and is oriented in the horizontal direction of paper tray 6 tops.The upstream extremity of pallet 50 is connected to paper guide 52, and the downstream end of pallet 50 is connected to the 38 recirculation path guides 53 that are provided with along the sheet conveying path, transport part 10 so that paper 3 is directed to second from pallet 50.

Paper path place on pallet 50 is provided with two oblique feed rolls 51,51 spaced reciprocally along the paper feed direction.These oblique feed rolls 51,51 are suitable for along a direction feeding paper, use so that paper and datum plate (not shown) adjacency.Datum plate is positioned at a lateral edge region of pallet 50.Every oblique feed rolls 51 comprises: an oblique feeding driven roller 54, the rotation of this driven roller are approximately perpendicular to the paper feed direction and extend; And an oblique feeding driven roll 55, this driven roll and driven roller 54 are clamping relation.The rotation of driven roll 55 along inclined direction extends, and the direction that promptly is offset vertical paper feed direction is extended, and is used to make paper and datum plate adjacency.

The paper 3 that is sent to pallet 50 from paper receiving part 49 moves to image forming part 5, by recirculation path guide 53 paper is inverted, makes the transverse edge of paper slidably against datum plate by driving oblique feed rolls 51 simultaneously.In image forming part 5, the back side of paper 3 is relative with photosensitive drums 23, is used for toner image is transferred to from photosensitive drums 23 back side of paper.The fixing toner image at fixed part 19 places is discharged into it on discharging pallet 36 then then.

(2) remove paper dirt at the paper path place

In laser printer 1, as shown in Figure 2, first and

second transport part

9 and 10 is arranged on 38 places, sheet conveying path, so that effectively remove the whole lip-deep paper dirt that is distributed in paper 3, described paper dirt be used to provide cut-out paper and by paper cut off taken place or owing to exist friction force to produce between the pad member 13b at paper supply part 7 places and the paper feed roller 12.

First transports the downstream that part 9 is positioned at the paper feed roller 12 of the front side in sheet conveying path 38 and paper-supply section 7, and with this roller at a distance of a predetermined space.In addition, first upstream of transporting the coupling part of part 9 between the downstream end of sheet conveying path 38 and recirculation path guide 53.First transports part 9 comprises: one first transports roller 9a, and this transports roller and is used to transport paper 3; One first removes paper dirt roller 9b, and this roller is placed with that to transport roller 9a with respect to sheet conveying path 38 and first relative; One the first sponge member 9c as first scraping, this sponge member is arranged on the below of removing paper dirt roller 9b near first; And one first anti-reverse member 9m that transports, this member is used to prevent that paper dirt is transported to sheet conveying path 38 from the first sponge member 9c.

First transports roller 9a is positioned within the curvature in sheet conveying path 38, and comprises a metal roller shaft 9d and a rubber layer 9e formed thereon.Main casing 2 rotatably mounted roll shaft 9d.Rotatably drive first by transmission of power along the direction shown in the arrow (clockwise direction among Fig. 1) and transport roller 9a from the motor (not shown).That is to say, along first zone of transporting roller 9a of forward (that is, along the paper feed direction) surfaces of revolution sheet conveying path 38.

First is arranged on the curvature of paper transport path 38 except that paper dirt roller 9b, and comprises a metal roller shaft 9f and a rubber layer 9g, and this rubber layer has the surface that is easy to change.Rubber layer is made by the rubber that fluorine coating constitutes by fluororesin or outside surface.First removes paper dirt roller 9b shown in Fig. 3 (c).First removes paper dirt roller 9b is oriented to and the paper surface of contact mat member 13b (will contact with photosensitive drums) contact, and aims at first longitudinal center's part of transporting roller 9a, and this core is in the face of separating pad 13.The width (axial length) of rubber layer roller 9g one second removes the width of the roller 10g of paper dirt roller 10b less than what will narrate later on, and is slightly larger than the width B of filling up member 13b as Fig. 3 (c) and 3 (d) shown in.

As shown in Figure 2, main casing 2 has a supporting member 100a, and first removes paper dirt roller 9b has a roll shaft 9f, rotatably mounted this roll shaft of supporting member 100a.First removes paper dirt roller 9b transports roller 9a driving by first, and rotates along the direction shown in the arrow (counter clockwise direction among Fig. 1).That is to say, along first zone of removing paper dirt roller 9b of forward (that is, along the paper feed direction) surfaces of revolution sheet conveying path 38.When paper 3 is removed paper dirt, paper 3 is sandwiched in first and transports roller 9a and first except that between the paper dirt roller 9b, so that transport paper 3.By the way, can reverse rotation first transport roller 9a and first, be used to unload the paper that blocks except that paper dirt roller 9b.

The first sponge member 9c is by making first to remove the charged material of paper dirt roller 9b and constitute easily.Typical material is the urethane foam material.The first sponge member 9c is positioned at the below of removing paper dirt roller 9b near first, and contacting with its pressure with respect to removing paper dirt roller 9b and sheet conveying path 38 relative positions, so that from striking off paper dirt except that paper dirt roller 9b.The first sponge member 9c and first removes paper dirt roller 9b sliding contact, so that first to remove the mantle friction of paper dirt roller 9b charged.The width of the first sponge member 9c is slightly larger than the width that first shown in Fig. 3 (c) removes the roller 9g of paper dirt roller 9b.

As shown in Figure 2, first anti-reverse first downstream of removing the contact position between paper dirt roller 9b and the paper 3 that is rotated in the forward in the direction of transporting member 9m at roller 9b, and roller 9b be rotated in the forward first the upstream in the direction except that the contact position between the paper dirt roller 9b and the first sponge member 9c.The first anti-reverse member 9m that transports extends along first axially parallel that removes paper dirt roller 9b, and makes roller 9b in the face of a predetermined space.As Fig. 4 preferably shown in, the first anti-reverse cross section of transporting member 9m is L shaped, this cross section has a base portion 9n and from the crooked tip portion 9p of base portion 9n.The first anti-reverse member 9m that transports is arranged to constitute integral body with the supporting member 100a of main casing 2, as the part of this supporting member.As shown in Figure 6, the first anti-reverse width of member 9m that transports is greater than first width except that the paper dirt roller 9b and the first sponge member 9c.

Shown in Fig. 2 and 4, it is relative with sheet conveying path 38 that base portion 9n is positioned to remove paper dirt roller 9b with respect to first, tilts to extend along the direction of approximate vertical, and separate except that paper dirt roller 9b with first.It is in an acute angle that tip portion 9p removes paper dirt roller 9b bending from the upper end of base portion 9n to first.The most advanced and sophisticated 9t of tip portion 9p and first gap L between the circumferential surface except that paper dirt roller 9b is in from 0.2 to 2.0 millimeter the scope, preferably in from 0.5 to 2.0 millimeter the scope.That is to say, this gap L makes and sticks to the first paper dirt (size is about several microns) that removes on the paper dirt roller 9b arrive the first sponge member 9c by the gap during it is rotated in the forward, but prevent the paper dirt piece (size is about several millimeters) that strikes off by the first sponge member 9c, and remove first then and prevent from the reverse rotation process of paper dirt roller 9b to arrive sheet conveying path 38 and from this release by the gap.

As shown in Figure 4, the first anti-reverse member 9m that transports is designed to intersection between online Y and the Z the one angle θ that are no more than 90 degree is provided, its center line Y is the tangent line that removes the line X between the rotation center of paper dirt roller 9b with respect to the most advanced and sophisticated 9t that is connected tip portion 9p and first, and line Z is the bearing of trend of tip portion 9p.In addition, tip portion 9p is along first upstream that direction is positioned at line X that is rotated in the forward of removing paper dirt roller 9b.Use this setting, most advanced and sophisticated 9t can face during first removes the reverse rotation (counter clockwise direction among Fig. 4) of paper dirt roller 9b and contact adheres to the first paper dirt that removes on the paper dirt roller 9b from the first sponge member 9c.

As shown in Figure 2, second transport part 10 and be positioned at first top and the downstream of transporting part 9.In addition, second downstream of transporting the coupling part of part 10 between the downstream end of sheet conveying path 38 and recirculation path guide 53.Second transports part 10 comprises: one second transports roller 10a, and this transports roller and is used to transport paper 3; One second removes paper dirt roller 10b, and this roller is placed with that to transport roller 10a with respect to sheet conveying path 38 and second relative; One the second sponge member 10c as scraping, this sponge member is arranged on the below of removing paper dirt roller 10b near second; And one second anti-reverse member 10m that transports, this member is used to prevent that paper dirt is transported to sheet conveying path 38 from the second sponge member 10c.

Second transports roller 10a is positioned within the curvature in sheet conveying path 38, and comprises a metal roller shaft 10d and a rubber layer 10e formed thereon.Main casing 2 rotatably mounted roll shaft 10d.Rotatably drive second by transmission of power along the direction shown in the arrow (clockwise direction among Fig. 1) and transport roller 10a from the motor (not shown).That is to say, along second zone of transporting roller 10a of forward (that is, along the paper feed direction) surfaces of revolution sheet conveying path 38.

Second is arranged on the curvature of paper transport path 38 except that paper dirt roller 10b, and comprises a metal roller shaft 10f and a rubber layer 10g, and this rubber layer has the surface that is easy to change.Rubber layer is made by the rubber that fluorine coating constitutes by fluororesin or outside surface.Second removes paper dirt roller 10b is oriented to and the whole paper surface of contact mat member 13b (will contact with photosensitive drums 23) contact.For this reason, shown in Fig. 3 (b), the width (axial length) of rubber layer roller 10g is slightly larger than paper width A.

Main casing 2 has one second supporting member 100b, and supporting member 100b rotatably mounted second removes the roll shaft 10f of paper dirt roller 10b.When motor (not shown) output power, drive second energetically and remove paper dirt roller 10b, so that second remove paper dirt roller 10b can be along the forward shown in the arrow among Fig. 2, that is to say, rotate along paper feed direction (counter clockwise direction among Fig. 1) in location in the face of sheet conveying path 38.When second removed paper dirt roller 10b removal paper dirt, paper 3 was clipped in second and transports roller 10a and second except that between the paper dirt roller 10b, so that transport paper 3.Second transport roller 10a and second remove paper dirt roller 10b can reverse rotation, as following will narrate be used to remove the paper that blocks.

The second sponge member 10c is by making second to remove the charged material of paper dirt roller 10b and constitute easily.Typical material is the urethane foam material.The second sponge member 10c is positioned at the below of removing paper dirt roller 10b near second, and contacting with its pressure with respect to removing paper dirt roller 10b and sheet conveying path 38 relative positions, so that from striking off paper dirt except that paper dirt roller 10b.The second sponge member 10c and second removes paper dirt roller 10b sliding contact, so that second to remove the mantle friction of roller 10g of paper dirt roller 10b charged.The width of the second sponge member 10c removes the width (axial length) of paper dirt roller 10b slightly greater than second shown in Fig. 3 (b).

As shown in Figure 2, second anti-reverse second downstream of removing the contact position between paper dirt roller 10b and the paper 3 that is rotated in the forward in the direction of transporting member 10m at roller 10b, and roller 10b be rotated in the forward second the upstream in the direction except that the contact position between the paper dirt roller 10b and the second sponge member 10c.The second anti-reverse member 10m that transports extends along second axially parallel that removes paper dirt roller 10b, and makes roller 10b in the face of a predetermined space.The second anti-reverse cross section of transporting member 10m is L shaped, and this cross section has a base portion 10n and from the crooked tip portion 10p of base portion 10n.The second anti-reverse member 10m that transports is arranged to constitute integral body with the supporting member 100b of main casing 2, as the part of supporting member 100b.Shown in Fig. 3 (b), the second anti-reverse width of member 10m that transports is greater than second width except that the paper dirt roller 10b and the second sponge member 10c.

It is relative with sheet conveying path 38 that base portion 10n is positioned to remove paper dirt roller 10b with respect to second, tilts to extend along the direction of approximate vertical, and separate except that paper dirt roller 10b with second.It is in an acute angle that tip portion 10p removes paper dirt roller 10b bending from the lower end of base portion 10n to second.Gap between the circumferential surface except that paper dirt roller 10b, the tip of tip portion 10p and second is in from 0.2 to 2.0 millimeter the scope, preferably in from 0.5 to 2.0 millimeter the scope.That is to say, this gap makes and sticks to the second paper dirt (size is about several microns) that removes on the paper dirt roller 10b arrive the second sponge member 10c by the gap during it is rotated in the forward, but prevent the paper dirt piece (size is about several millimeters) that strikes off by the second sponge member 10c, remove in the reverse rotation process of paper dirt roller 10b second and arrive sheet conveying path 38 by the gap.

With first anti-reverse to transport member 9m similar, the second anti-reverse member 10m that transports is designed to angles that are no more than 90 degree are being provided with respect to the intersection between the extension line of the tangent line of line and tip portion 10p, and this line connects the tip and second rotation center except that paper dirt roller 10b of tip portion 10p.In addition, tip portion 10p is along second upstream that direction is positioned at a line that is rotated in the forward of removing paper dirt roller 10b, and this line connects the tip and second rotation center except that paper dirt roller 10b of tip portion 10p.Use this setting, the second anti-reverse tip of transporting member 10m can adhere to second except that the paper dirt on the paper dirt roller 10b except that facing during the reverse rotation of paper dirt roller 10b and contact from the second sponge member 10c second.

In laser printer 1, be stacked on paper 3 on the paper supply tray 6 and open with a stacker and separate, and cooperate with paper feed roller 12 and separating pad 13 and to supply with paper.In the process of this paper supply,, therefore produce a large amount of paper dirt in the image forming surface of paper owing to friction to separating pad 13.Yet, to transport part 9 in that paper 3 is transported to first, and paper 3 is clipped in first when transporting roller 9a and first and removing between the paper dirt roller 9b, image forming surface contact first removes the roller 9g of paper dirt roller 9b.Because first removes the width of the width of paper dirt roller 9b greater than separating pad 13, the therefore paper dirt that equates with the width of pad member 13b basically of the first roller 9g scraped dispersion of distribution of removing paper dirt roller 9b, and with electrostatic means attraction thereon.Remove paper dirt roller 9b by being rotated in the forward first, when paper dirt by first anti-reverse transport member 9m and first gap L of removing between the paper dirt roller 9b after, strike off from this by the first sponge member 9c and to transfer to first except that the paper dirt on the roller 9g of paper dirt roller 9b.

Then, transport part 10 in that paper 3 is transported to second, and paper 3 is clipped in second when transporting roller 10a and second and removing between the paper dirt roller 10b, image forming surface contact second removes the roller 10g of paper dirt roller 10b.Because second removes the width of paper dirt roller 10b greater than paper width, therefore can strike off paper dirt on the paper cut-off part whole width that produce and that be distributed in paper by the second roller 10g that removes paper dirt roller 10b, and do not removed the residue paper dirt that paper dirt roller 9b removes fully, and attract thereon with electrostatic means by first.Remove paper dirt roller 10b by being rotated in the forward second, when paper dirt by second anti-reverse transport member 10m and second gap L of removing between the paper dirt roller 10b after, strike off from this by the second sponge member 10c and to transfer to second except that the paper dirt on the roller 10g of paper dirt roller 10b.

Therefore, remove

paper dirt roller

9b and 10b can remove a large amount of paper dirt that friction is produced to pad member 13b from paper by first and second, a small amount of paper dirt of original generation when removing paper dirt roller 10b and can remove paper and cut off by second.Therefore,

transport part

9 and 10 by first and second and can effectively remove the above-mentioned paper dirt that is evenly distributed on the paper surface.Therefore, can prevent effectively that paper dirt from entering image forming part 5, so that high-quality image to be provided.

First and second transport the paper dirt that

part

9,10 removes is struck off by the first and

second sponge member

9c, 10c, and gathers and become paper dirt piece thereon, and this dust piece will drop in described admittances in back surperficial 65 then.

In the paper feed direction, be arranged on first downstream of removing paper dirt roller 9b because second removes paper dirt roller 10b, the paper 3 that paper-supply section 7 provides at first is subjected to the first paper dirt that removes paper dirt roller 9b and removes, promptly because a large amount of dusts that friction is produced to pad member 13b, be subjected to the second paper dirt that removes paper dirt roller 10b then and remove, be i.e. original small amount of dust that is distributed in the whole surface of paper owing to cut off paper.Therefore, can carry out effective paper dirt according to the quantity of paper dirt and remove, realize uniform paper dirt removal by this.

In addition, because second removes the width of paper dirt roller 10b greater than paper width, and first width that removes paper dirt roller 9b is greater than the width of separating pad 13 and less than second width that removes paper dirt roller 10b, therefore first remove paper dirt roller 9b and need not to have long width, still can carry out the optimum width that sufficient paper dirt is removed but have one.Thereby, can reduce production costs.

In addition, as mentioned above, in laser printer 1, first removes paper dirt roller 9b and paper feed roller 12 intervals one predetermined space, and is in the downstream of this paper feed roller, is in direct contact with it avoiding.Suppose that first removes paper dirt roller 9b and directly contact with paper feed roller 12.If pull out back one paper 3 slightly, and because the relation of the sliding friction between paper feed roller 12 and the separating pad 13, make back one paper follow last paper 3, then be clipped in paper feed roller 12 and between the paper dirt roller 9b, the operation of laser printer 1 stopped with first at the fore-end of back one paper with the splice relation of last paper of part.Therefore, make one paper nipped fore-end in back form curling.Therefore, the meeting of the feeding subsequently generation paper of the paper that curls blocks, and scalloping perhaps takes place in the curled portion office.

Yet, do not contact with paper feed roller 12 except that paper dirt roller 9 is placed with owing to first, even last paper is pulled out and followed to back one paper slightly, can not clamp the fore-end of back one paper yet.This will prevent that fore-end is curled.Therefore, when fully removing paper dirt, can realize sufficient paper supply.

In addition, in the first and second

sheet conveying parts

9 and 10, the first sponge member 9c is configured to face first and removes paper dirt roller 9b, stick to the first paper dirt that removes on the paper dirt roller 9b so that strike off, and the second sponge member 10c is configured to face second except that paper dirt roller 10b, is bonded in the second paper dirt that removes on the paper dirt roller 10b so that strike off.Thereby, carry out paper dirt at each the sponge member place that is used for every elimination paper dirt roller and strike off.Therefore, the paper dirt of every elimination paper dirt roller can be removed efficient and remain on the degree that to remove paper dirt for a long time.

By the way, even because paper makes paper dirt zone exceed width except that paper dirt roller slightly with contacting except that the pressure between the paper dirt roller, because the width of the first and

second sponge member

9c and 10c is slightly larger than the first and second relevant width except that

paper dirt roller

9b and 10b respectively, so can strike off paper dirt ideally.

In addition, in laser printer 1, at first transport roller 9a and first and remove the paper 3 that paper dirt roller 9b transmission paper-supply section 7 provides by first, remove paper dirt simultaneously, transport roller 10a and second by second then and remove paper dirt roller 10b and transmit this paper, remove paper dirt simultaneously once more.Therefore, when carrying out effective paper dirt removal, paper is transported to image forming part 5 ideally.

In addition, second removes paper dirt roller 10b is not transported roller 10a subordinate by second and drives, because the motor (not shown) removes paper dirt roller 10b driving power is provided for second, so this roller is a self-driven member.Therefore, even owing to contact with the second sponge member 10c with paper 3, meeting be applied to second with a drag loading and remove on the whole roller segment 10g of paper dirt roller 10b, and the second constant rotation that removes paper dirt roller 10b also can be carried out effective paper dirt and remove and effective paper feed.

In addition, in laser printer 1, be provided with again and again cycling element 41, the first and transport the upstream that part 9 is arranged on the coupling part between sheet conveying path 38 and the recirculation path guide 53, and second transports the downstream that part 10 is arranged on this coupling part.Use this kind structure,, therefore first remove paper dirt roller 9b and contact the paper 3 that paper-supply section 7 provides uniquely because first remove the upstream that paper dirt roller 9b is arranged on this coupling part.In addition, because second remove the downstream that paper dirt roller 10b is arranged on this coupling part, therefore second remove the paper that paper that paper dirt roller 10b contact paper-supply section 7 provides and recirculation path guide 53 provide.

Therefore, the paper that provides with respect to paper-supply section 7, first removes paper dirt roller 9b has removed a large amount of paper dirt that produced owing to the friction to pad member 13b, and second remove paper dirt roller 10b and removed and be subjected to that the first paper dirt that removes paper dirt roller 9b is removed and the paper dirt from the paper of paper-supply section 7 feedings, also removed the paper dirt from the paper of recirculation path guide 53 feedings.About paper, contacted the first image forming surface of removing the roller segment 9g of paper dirt roller 9b and do not removed paper dirt roller 10b, but the opposite face of paper is in contact with it in the face of second from 53 feedings of recirculation path guide.Because the opposite face of paper does not carry the paper dirt that friction is produced to pad member 13b.Therefore, second remove paper dirt roller 10b and can only remove paper and be breaking at a small amount of paper dirt that the whole surface of paper produces.

As shown in Figure 1, the feeder part 4 of laser printer 1 also comprises: a multi-usage pallet 14, this pallet are used for piling up the paper 3 of a folded arbitrary dimension thereon; One multi-usage paper-feeding mechanism 15, this mechanism is used to supply the paper on multi-usage pallet 14; An and multi-usage sheet conveying part 16.

As shown in Figure 2, multi-usage paper-feeding mechanism 15 comprises a multi-usage paper feed roller 15a and a multi-usage separating pad 15b, this separating pad is placed to multi-usage paper feed roller 15a directly faces.Multi-usage separating pad 15b comprises a scaffold 15c, a multi-usage pad member 15d and a spring 15e.

Scaffold 15c has: a base end part, and this base end part pivots and is bearing on the main casing 2, and has a L shaped cross section; And a free end, this free end and base end part constitute whole, with multi-usage paper feed roller 15a in the face of and be positioned at the below of this roller.Free end is embedded with multi-usage pad member 15d, and spring 15e leans against the opposite side of pad member 15d, is generally used for promoting multi-usage pad member 15d to paper feed roller 15a.

Multi-usage pad member 15d has the shape of rectangular plate roughly, and is made by the resilient material such as urethane rubber.Multi-usage separating pad 15b has the width of the transverse center part that can contact paper, is used for paper feed.

When multi-usage paper feed roller 15a rotated, the top paper that the stacker on the multi-usage pallet 14 is opened was sandwiched between multi-usage paper feed roller 15a and the multi-usage separating pad 15b.From a stacker is opened, separate the paper of every the top and transmit this paper in this kind mode.

Multi-usage transport part 16 second transport part 10 above, the downstream of multi-usage paper-feeding mechanism 15 and be arranged on multi-usage paper-feeding mechanism 15 and image forming part 5 between the upstream of alignment roller 11 at paper transport path 38a place.Multi-usage is transported part 16 and comprised: a multi-usage that is used to transport paper 3 is transported roller 16a; One multi-usage of facing with it is removed paper dirt roller 16b; The one multi-usage sponge member 16c as scraper component, this member remove the below of paper dirt roller 16b near multi-usage; And the anti-reverse member 16m that transports of a multi-usage, this member is used to prevent the paper dirt that multi-usage sponge member 16c discharges is sent into paper transport path 38a.

Multi-usage transfer roller 16a comprises a metal roller shaft 16d and a rubber layer 16e formed thereon.Main casing 2 rotatably mounted roll shaft 16d, and by rotatably driving this roll shaft from motor (not shown) transmission of power along the direction shown in the arrow among Fig. 2 (counter clockwise direction among Fig. 1).That is to say, rotate the zone of the roller 16a that faces with sheet conveying path 38a along the forward drive identical with the paper feed direction.

Multi-usage is removed paper dirt roller 16b and is comprised a metal roller shaft 16f and a rubber layer 16g, and this rubber layer has the surface that is easy to change.Rubber layer is made by the rubber that fluorine coating constitutes by fluororesin or outside surface.Multi-usage is removed paper dirt roller 16b and is oriented to and the paper surface contact that contacts multi-usage pad member 15d, and aims at the core of multi-usage transfer roller 16a, and this core is in the face of multi-usage separating pad 15b.The width (axial length) of multi-usage rubber layer roller 16g is slightly larger than the width of multi-usage pad member 15d.

Main casing 2 has a supporting member 100c, and the rotatably mounted multi-usage of supporting member 100c is removed the roll shaft 16f of paper dirt roller 16b.Drive multi-usage by multi-usage transfer roller 16a and remove paper dirt roller 16b, and in the face of the location in sheet conveying path 38 along the direction (clockwise) shown in the arrow among Fig. 2, that is to say, should be along the rotation of paper feed direction except that paper dirt roller.When multi-usage is removed paper dirt roller 16b and removed paper dirt, paper 3 is clipped in multi-usage transports roller 16a and multi-usage except that between the paper dirt roller 16b, so that this paper of feeding.Can the reverse rotation multi-usage transport roller 16a and multi-usage and remove paper dirt roller 16b, be used to unload the paper that blocks.

Multi-usage sponge member 16c constitutes by making multi-usage remove the charged material of paper dirt roller 16b easily.Typical material is the urethane foam material.Multi-usage sponge member 16c is positioned at the below of removing paper dirt roller 16b near multi-usage, and contact with its pressure in the position relative with paper transport path 38a, this paper transport path is extended from multi-usage paper-feeding mechanism 15 with respect to removing paper dirt roller 16b, so that strike off paper dirt from removing paper dirt roller 16b.The width of multi-usage sponge member 16c is slightly larger than the width that multi-usage is removed the roller 16g of paper dirt roller 16b.Multi-usage sponge member 16c and multi-usage are removed paper dirt roller 16b sliding contact, so that multi-usage is charged except that the mantle friction of the roller segment 16g of paper dirt roller 16b.

As shown in Figure 2, the anti-reverse downstream of removing the contact position between paper dirt roller 16b and the paper 3 in the direction in multi-usage that is rotated in the forward of transporting member 16m of multi-usage, and being rotated in the forward in the direction at roller 16b in the upstream of multi-usage except that the contact position between paper dirt roller 16b and the multi-usage sponge member 16c at roller 16b.The anti-reverse member 16m that transports of multi-usage removes the axially parallel extension of paper dirt roller 16b along multi-usage, and makes roller 16b in the face of a predetermined space.The anti-reverse cross section of transporting member 16m of multi-usage is L shaped, and this cross section has a base portion 16n and from the crooked tip portion 16p of base portion 16n.The anti-reverse member 16m that transports is arranged to constitute integral body with the supporting member 100c of main casing 2 with multi-usage, as the part of supporting member 100c.The anti-reverse width that transports member 16m of multi-usage removes the width of paper dirt roller 16b and multi-usage sponge member 16c greater than multi-usage.

As shown in Figure 2, it is relative with sheet conveying path 38a and under it that base portion 16n is positioned to remove paper dirt roller 16b with respect to multi-usage, along the extension of tilting of the direction of approximate vertical, and separates except that paper dirt roller 16b with multi-usage.Tip portion 16p is in an acute angle except that paper dirt roller 16b bending to multi-usage from the upper end of base portion 16n.The tip of tip portion 16p and multi-usage are removed in the scope that gap between the paper dirt roller 16b is in from 0.2 to 2.0 millimeter, preferably in from 0.5 to 2.0 millimeter the scope.That is to say, this gap makes and sticks to the paper dirt (size is about several microns) that multi-usage removes on the paper dirt roller 16b arrive multi-usage sponge member 16c by the gap during it is rotated in the forward, but prevent the paper dirt piece (size is about several millimeters) that strikes off by multi-usage sponge member 16c, and remove in multi-usage and to prevent from the reverse rotation process of paper dirt roller 16b to arrive sheet conveying path 38 and from this release by the gap.

With first anti-reverse to transport member 9m similar, multi-usage is anti-reverse transports member 16m and is designed to angles that are no more than 90 degree are being provided with respect to the intersection between the extension line of the tangent line of a line and tip portion 16p, and described line connects the tip and the rotation center of multi-usage except that paper dirt roller 16b of tip portion 16p.In addition, tip portion 16p is in the upstream that direction is positioned at a line that is rotated in the forward that multi-usage is removed paper dirt roller 16b, and this line connects the tip of tip portion 16p and the rotation center that multi-usage is removed paper dirt roller 16b.Use this setting, the anti-reverse tip of transporting member 16m of multi-usage can face during multi-usage is removed the reverse rotation of paper dirt roller 16b and contact adheres to multi-usage except that the paper dirt on the paper dirt roller 16b from multi-usage sponge member 16c.

Be stacked on paper 3 on the multi-usage paper supply tray 14 in the multi-usage paper-feeding mechanism 15 and open with a stacker and separate, and cooperate with multi-usage paper feed roller 15a and multi-usage separating pad 15b and to supply with paper.In the process of this paper supply, owing to, therefore produce a large amount of paper dirt in the surface of paper to multi-usage separating pad 15b friction.Yet, in that being transported to multi-usage, paper 3 transports part 16, and paper 3 is clipped in multi-usage transports roller 16a and multi-usage when removing between the paper dirt roller 16b, because multi-usage is removed the width that the width of paper dirt roller 16b is slightly larger than multi-usage separating pad 15b, therefore the multi-usage paper dirt that equates with the width of multi-usage pad member 15d basically with the dispersion of distribution that removes the roller 16g scraped of paper dirt roller 16b friction is produced to multi-usage separating pad 15b, and with electrostatic means attraction thereon.Remove paper dirt roller 16b by being rotated in the forward multi-usage along the direction of arrow (among Fig. 2 clockwise), when paper dirt by multi-usage anti-reverse transporting after member 16m and multi-usage remove gap between the paper dirt roller 16b, can strike off from this with multi-usage sponge member 16c and transfer to the paper dirt that multi-usage is removed the roller 16g of paper dirt roller 16b.

In this kind mode, the paper dirt of width that produce and that be distributed in multi-usage separating pad 15b top in the time of can rubbing to multi-usage separating pad 15b from the surperficial coideal ground removal of paper 3.Removing from multi-usage by multi-usage sponge member 16c after paper dirt roller 16b strikes off paper dirt, paper dirt will become paper dirt piece, and deposition thereon, and paper dirt piece will drop in described admittances in back surperficial 65 then.

In laser printer 1, be fed in the process of image forming part 5 by sheet conveying path 38 at paper, when transporting that roller 9a and first removes between the paper dirt roller 9b or second when transporting roller 10a and second and removing paper between the paper dirt roller 10b and pressed from both sides state generation paper obstruction first, can be after pulling out paper supply tray 6, from paper-supply section 7, (promptly transport the downside of part 9) and pull out the paper of obstruction from first.Under this kind situation, first of reverse rotation contact paper 3 removes paper dirt roller 9b and second and removes paper dirt roller 10b, the first and

second sponge member

9c and 10c can be struck off and accumulates in paper dirt piece on the described sponge member and send back to first and remove paper dirt roller 9b and second and remove paper dirt roller 10b.

Yet, remove paper dirt roller 9b and second except that during the reverse rotation of paper dirt roller 10b first, when dust piece during respectively in the face of the first and second anti-reverse tip portions that transport

member

9m, 10m, paper dirt piece can't be by the first anti-reverse most advanced and sophisticated 9t that transports member 9m and first gap L of removing between the paper dirt roller 9b, also can't by second anti-reverse transport member 10m with second except that the gap between the paper dirt roller 10b.Thereby the dust piece is blocked in first and second anti-reverse tip portion 9p, the 10p places that

transport member

9m, 10m respectively.Therefore, these dust pieces can't be introduced sheet conveying path 38.

Therefore, in unloading the paper process of obstruction, even also the paper dirt that the first and

second sponge member

9c, 10c collect can't be entered sheet conveying path 38 by first and second reverse rotations that remove paper dirt roller 9b, 10b.Therefore, can protect back one paper to avoid the contamination of this paper dirt.Thereby, can avoid paper dirt to stick on the photosensitive drums 23, and produce desirable image forming.

Similarly, be fed in the process of image forming part 5 by sheet conveying path 38a at paper, when removing paper between the paper dirt roller 16b in multi-usage transfer roller 16a and multi-usage and pressed from both sides state generation paper and block, can be from paper-supply section (that is, from multi-usage supply tray 14) pull out the paper of obstruction.In this case, the multi-usage of contact paper 3 is removed paper dirt roller 16b reverse rotation, removes the reverse rotation of paper dirt roller 16b according to multi-usage and the paper dirt piece that is struck off and accumulate on this member by multi-usage sponge member 16c can be sent back to.

Yet during multi-usage was removed paper dirt roller 16b reverse rotation, when paper dirt piece transported the tip portion 16p of member 16m in the face of multi-usage is anti-reverse, paper dirt piece can't be by anti-reverse member 16m and the multi-usage of transporting of multi-usage except that the gap between the paper dirt roller 16b.Thereby the dust piece is blocked in the anti-reverse tip portion 16p place that transports member 16m of multi-usage.Therefore, the dust piece can't be introduced sheet conveying path 38.

Therefore, in unloading the paper process of obstruction, even the reverse rotation that removes paper dirt roller 16b by multi-usage also can't enter sheet conveying path 38 with the paper dirt that multi-usage sponge member 16c collects.Therefore, can protect back one paper to avoid the contamination of this paper dirt.Thereby, can avoid paper dirt to stick on the photosensitive drums 23, and produce desirable image forming.

In addition, in laser printer 1, because above-mentioned clearance distance is in 0.2 to 2.0 millimeter scope, therefore first remove paper dirt roller 9b, second and remove paper dirt roller 10b and multi-usage and remove paper dirt roller 16b and be rotated in the forward during, corresponding gap can make paper dirt pass through wherein, arrive the first sponge member 9c, the second sponge member 10c and multi-usage sponge member 16c respectively, but the gap prevent paper dirt first remove paper dirt roller 9b, second and remove paper dirt roller 10b and multi-usage to remove the reverse rotation of paper dirt roller 16b during in opposite direction by wherein.Thereby, use that this kind is simple to be provided with, the paper dirt that sticks on

roller

9b, 10b, the 16b can be transported to

sponge member

9c, 10c, 16c really, and can prevent that paper dirt oppositely is transported to from

sponge member

9c, 10c, 16c and

transport path

38,38a.

In addition, because the first anti-reverse member 9m, second that transports anti-reversely transports member 10m and the anti-reverse above-mentioned orientation of transporting tip portion 9p, 10p and the 16p of member 16m of multi-usage, thus tip portion 9p, 10p, 16p can in the face of and the contact paper dirt piece of sending back to according to the reverse rotation of these

rollers

9b, 10b, 16b.Therefore, can not send paper dirt piece back to.Thereby the first anti-reverse member 9m, second that transports anti-reversely transports member 10m and the anti-reverse member 16m that transports of multi-usage can prevent oppositely transporting of paper dirt piece.

In addition, because the anti-reverse member 9m that transports, the width of 10m and 16m respectively with

relevant roller

9b, 10b, 16b and

sponge member

9c, 10c, above-mentioned relation between the width of 16c, therefore remove paper dirt roller 9b first, second removes paper dirt roller 10b and multi-usage is removed in the reverse rotation of paper dirt roller 16b, even paper dirt piece is distributed in

sponge member

9c, 10c, on the whole width of 16c, the first anti-reverse member 9m that transports, second anti-reversely transports member 10m and the anti-reverse member 16m that transports of multi-usage can stop paper dirt piece really, and to

roller

9b, 10b, transmit these paper dirt pieces on the whole width of 16b.

In addition, the first anti-reverse member 9m, second that transports anti-reversely transports member 10m and the anti-reverse member 16m that transports of multi-usage is not independent member, but is configured to respectively to constitute whole with supporting

member

100a, 100b, the 100c of main casing 2.Therefore, can form first anti-reverse member 9m, second anti-reverse member 10m and the anti-reverse member 16m that transports of multi-usage of transporting of transporting easily,, thereby reduce production costs with the quantity of minimizing mechanical component.

In addition, in the above-described embodiments, be example with the first anti-reverse member 9m that transports, base portion 9n and tip portion 9p are writing board shapes, can form base end part 9n and tip portion 9p by locating a crooked acute angle in suitable part.Replace this setting, as shown in Figure 5, it is contemplated that the first anti-reverse another setting of transporting member 9m ', so that tip portion 9p ' is the extension replacement sharp bend part of an arch section.In this revises, first reverse rotation that removes paper dirt roller 9b is faced in the sensing of tip surface 9t ', tip portion 9p ' intersects one with tangent line and is no more than 90 angles of spending, in addition, tip portion 9p ' removes roller 9b along the first paper dust and is rotated in the forward the upstream that direction is positioned at the line X of the rotation center that connects tip surface 9t ' and this roller.

(3) paper dirt skewed slot

When being become one or a preliminary dimension piece by the paper dirt that struck off, the paper dirt that is struck off by the first sponge member 9c, the second sponge member 10c and multi-usage sponge member 16c since gravity will fall from every sponge.In laser printer 1, be provided with a paper dirt skewed slot 39, this skewed slot is used for guiding paper dirt group and moves down.Paper dirt skewed slot 39 vertically extends in the front in sheet conveying path 38, and is made of a guide plate part 61, an extension 62 and a dividing plate 63.

Guide plate 61 is lamellar members, and it is made of the front side in sheet conveying path 38, so that paper 3 is directed to image forming part 5 from paper-supply section 7.Thereby guide plate 61 has as a side in sheet conveying path 38 with as the opposite side of paper dirt skewed slot.More particularly, guide plate 61 comprises that one is used for that paper 3 is transported the first guide plate 61a and that part 10 is directed to alignment roller 11 from second and is used for that paper 3 is transported part 9 from first and is directed to second and transports the second guide plate 61b of part 10.

The first guide plate 61a is a thin-plate element, and it tilts to extend to the front of alignment roller 11 from second upper space that transports part 10.The first guide plate 61a has a side, and this side guiding paper 3 transports part 10 moving to alignment roller 11 from second.The another side of the first guide plate 61a can make paper dirt transport part 16 whereabouts from the multi-usage that is positioned at first guide plate 61a top.The first guide plate 61a has a lower end, and this lower end integral body is provided with one and is tilted to down the extension 62a that extends, and this extension is used to cover second top of transporting part 10.

The second guide plate 61b is a thin-plate element, and moderately bends to S shape from the lower space that second lower space to the first of transporting part 10 is transported part 9.The second guide plate 61b has a side, and this side guiding paper 3 transports part 9 from first and transports moving of part 10 to second.The another side of the second guide plate 61b can make paper dirt transport part 10 whereabouts from being positioned at second of second guide plate 61b top, and the paper dust transports part 16 whereabouts from multi-usage.The second guide plate 61b has a center section, and this center section is provided with one and is tilted to down the lamellar extension 62b that extends, and this extension is used to cover first top of transporting part 9.

In addition, first and second anti-reverse base end part 9n, the 10n that

transport member

9m, 10m also can be used as the guiding piece that the paper dirt that is used to guide the whereabouts moves down.

By the way, form continuously one the 3rd guide plate 61c from the second guide plate 61b, the 3rd guide plate is in to remove than first faces low position, position between paper dirt roller 9b and the first sponge member 9c.The 3rd guide plate 61c has a horizontal curvature end portion, the position of this end portion above the connection/separation path of paper supply tray 6.

Dividing plate 63 is positioned at the front of the second guide plate 61b, and is spaced from a predetermined space.Dividing plate 63 comprises a side plate 63c and a base plate 63d who vertically extends, and this base plate roughly curves a right angle forward from the lower end of side plate 63c.

In addition, first remove the paper dirt roller 9b and the first sponge member 9c the front and below a front side diapire 64 is set.Front side diapire 64 be positioned at paper supply tray 6 attached/separate the top in path and extend in parallel along this path, and have one in abutting connection with the fore-end and of an antetheca of main casing 2 as the rear end part of admitting surface 65, this admittances is surperficial to be used for carrying thereon and to transport part 10 and first from multi-usage translator unit 16, second and transport the paper dirt that part 9 falls.

Admit surface 65 to comprise a recess 66, an inclined wall part 67 and a spine 68.Recess 66 has a semi-circular cross-section, and it is relative with sheet conveying path 38 with the first sponge member 9c to be configured to remove paper dirt roller 9b with respect to first, and removes extending axially of paper dirt roller 9b along first.Inclined wall part 67 is nearer with the distance in sheet conveying path 38 than recess 66 with the distance in sheet conveying path 38, and the sheet conveying path 38 that is inclined upwardly.It is relative with the first sponge member 9c that spine 68 is configured to remove paper dirt roller 9b with respect to recess 66 and first, and have the height of the upper part that is lower than inclined wall part 67.By the way, at the place, space of recess 66 a spiral propeller member (screwfeed member) 71 is set, as later paper dirt delivery unit with narration.

Use this setting, can be transported the paper dirt that multi-usage sponge member 16c in the part 16 struck off and became paper dirt piece by multi-usage along first guide plate 61a guiding, and it is fallen on the 62a of extension, can also be along the second anti-reverse base end part 10n channeling conduct of transporting member 10m.Then,, and it is fallen on the 62b of extension,, it is fallen admit on the surface 65 then along the first anti-reverse base end part 9n channeling conduct of transporting member 9m further along the second guide plate 61b guiding paper dirt.

In addition, struck off and become the paper dirt of paper dirt piece along second guide plate 61b guiding by the second second sponge member 10c that transports in the part 10, and it is fallen on the 62b of extension, then along the first anti-reverse base end part 9n channeling conduct of transporting member 9m.Then, paper dirt is fallen and is admitted on the surface 65.The paper dirt that is struck off by the first sponge member 9c and become paper dirt piece is fallen and is admitted on the surface 65.

By the way, in laser printer 1, first and second anti-reverse base end part 9n, the 10n of

member

9m, 10m of transporting are also as being used for the guiding piece that guiding paper dirt moves down.Therefore, first and second side zones of removing

paper dirt roller

9b, 10b do not need other guiding piece.Therefore, simple structure causes mechanical component to reduce, thereby reduces production costs.

(4) paper dirt transporting and collecting

Shown in Fig. 6 and 7, laser printer 1 provides spiral propeller member 71, this member be used for after dropping on the paper dirt of admitting on the surface 65 and being transported to from paper dirt fall area 83 with the paper dirt sump portion of narrating 84.

Along the recess 66 of admitting surface 65 spiral propeller member 71 is set.Shown in Fig. 6 and 7, spiral propeller member 71 comprises that a shaft component 72 and one are installed in one first spiral part 73 and one second spiral part 74 on the shaft component 72.The hand of spiral of second spiral part 74 is opposite with first spiral part 73.One spiral propeller transmission gear 75 is installed in the next door of an end and second spiral part 74 of shaft component 72, so that drive spiral propeller members 71 by gear train 90 rotations with narration that link to each other with the motor (not shown), later.

More particularly, as shown in Figure 8, gear train 90 comprises: a motor connection gear 91; One upper gear is 92, and this gear train is used for power is delivered to multi-usage paper-feeding mechanism 15 from motor connection gear 91, so that drive this mechanism; And a bottom gear train 93, this gear train is used for power is delivered to spiral propeller member 71 from motor connection gear 91, so that rotation drives this member.Motor connection gear 91 is the two poles of the earth gears, this gear comprise one with upper gear be the small diameter gear that the gear wheel in large diameter and of 92 engagements mesh with lower teeth train 93.

Upper gear is 92 to comprise three transmission gears of vertically arranging 94,95,96.Multi-usage paper feed roller transmission gear 97 is fixedly mounted on the end of roll shaft of multi-usage paper feed roller 15a.Transmit

gear

96 and 97 engagements of multi-usage paper feed roller transmission gear, thereby the rotation of the gear wheel in large diameter of motor connection gear 91 can make transmission gear 97 rotate in the counterclockwise direction by transmitting

gear

94,95,96.

Lower teeth train 93 comprises two transmission gears of vertically arranging 98,99.Transmit

gear

99 and 75 engagements of spiral propeller transmission gear, thereby the rotation of the small diameter gear of motor connection gear 91 can make the shaft component 72 of spiral propeller member 71 be rotated in a clockwise direction by transmitting

gear

98,99.

Thereby as shown in Figure 2, rotating screw thruster member 71 can make and move down on the surface at a side place that faces with the inclined wall part 67 of admitting on the surface 65 and move up on the surface at a side place that faces with spine 68.

Shown in Fig. 6 and 7, first spiral part 73 is axially disposed within half length place of shaft component 72, and is suitable for transporting paper dirt to first axial end portion (directions X among Fig. 6) that removes paper dirt roller 9b when shaft component 72 rotations.Second spiral part 74 is axially disposed within remaining half length place of shaft component 72, and is suitable for transporting paper dirt to first another axial end portion (the Y direction among Fig. 6) that removes paper dirt roller 9b when shaft component 72 rotations.Thereby by the rotation of shaft component 72, spiral propeller member 71 can transport paper dirt to two axial end portions simultaneously in opposite direction.

Can transport to its two ends by rotating screw thruster member 71 and transport from first that part 9, second is transported part 10 and multi-usage is transported the paper dirt that part 16 falls.Thereby, in the paper dirt accumulator 84 with narration after the paper dirt that is divided into both direction can accumulate in.

By the way, in laser printer 1, first rotational speed of removing paper dirt roller 9b is made as about 180 rev/mins.Yet the rotational speed of spiral propeller member 71 is lower than first and removes paper dirt roller 9b, for example about 60 rev/mins.Be made as by rotational speed and be lower than first rotational speed of removing paper dirt roller 9b, can prevent that spiral propeller member 71 from disperseing paper dirt during transporting paper dirt, and reduce the driving noise spiral propeller member 71.In addition, can also reduce spiral propeller member 71 because the rubbing wear that friction is produced to paper dirt.

Laser printer 1 is provided with a control wall 76 in the part of spiral propeller member 71 with along this member.Shown in Fig. 2,6 and 7, control wall 76 comprises one first next door and one second next door.First next door comprises: a side first next door 77, this next door are configured to along crossing first spiral part 73 with the axial vertical direction of spiral propeller member 71; And opposite side first next door 78, this next door is configured to along crossing second spiral part 74 with the axial vertical direction of spiral propeller member 71.Second next door 79 extends in parallel along spiral propeller member 71, and is spaced from a predetermined space.One end in second next door 79 is connected to the front end of an alar septum 77, and the other end in second next door 79 is connected to the front end in opposite side next door 78, so that control wall 76 takes the shape of the letter U in planimetric map.

More particularly, first

next door

77,78 has roughly rectangular shape, and along having width with the axial vertical direction of spiral propeller member 71, this width is identical with the width of admitting surface 65 basically.The lower end in first

next door

77,78 is configured to be lower than first contact area that removes between the paper dirt roller 9b and the first sponge member 9c, and separates a predetermined space with the top of spiral propeller member 71.The upper end in first

next door

77,78 is configured to be higher than first contact area that removes between the paper dirt roller 9b and the first sponge member 9c, and the cover component 85 that will narrate after extending to.First

next door

77,78 is configured in the face of first axial end portion except that the paper dirt roller 9b and the first sponge member 9c, and is in outside all ends.

Second next door 79 comprises: a center wall 80, and this center wall extends in parallel along spiral propeller member 71, and is spaced from a predetermined space; Lopsidedness wall 81, this inclined wall extends and bending to spiral propeller member 71 from an end of center wall 80; Opposite side inclined wall 82, this inclined wall extends and bending to spiral propeller member 71 from the other end of center wall 80.Center wall 80 and

inclined wall

81,82 are arranged to one mutually.

Lopsidedness wall 81 extends between the front end in end of center wall 80 and a side first next door 77, and links to each other with center wall 80.Thereby, the space that lopsidedness wall 81 provides the end (that is, along paper dirt carriage direction X) to spiral propeller member 71 to narrow down gradually between lopsidedness wall 81 and spiral propeller member 71.

Opposite side inclined wall 82 extends between the front end in the other end of center wall 80 and opposite side first next door 78, and links to each other with center wall 80.Thereby, the space that opposite side inclined wall 82 provides the other end (that is, along another paper dirt direction of transfer Y) to spiral propeller member 71 to narrow down gradually between opposite side inclined wall 82 and spiral propeller member 71.

The lower end that comprises center wall 80 and second next door 79 of

inclined wall

81,82 is connected with the end face of front side diapire 64, and the upper end in second next door 79 extend to after with the narration cover component 85.

Comprise that the front side diapire 64 of admitting surface 65 is divided into paper dirt drop section area 83 and paper dirt accumulator 84 by the control wall 76 that first

next door

77,78 and second next door 79 provide.

That is to say, paper dirt landing part 83 be positioned on the front side diapire 64, a zone that the axial centre of spiral propeller member 71 is partly located, and this zone is positioned at first below of removing the paper dirt roller 9b and the first sponge member 9c, removes the paper dirt that paper dirt roller 9b scrapes from first like this and can fall on this zone.This zone is the inside of

first partition wall

77,78 and second partition wall 79.On the other hand, paper dirt accumulator 84 is to be positioned on the front side diapire 64 and some zones adjacent with each end of spiral propeller member 71, and the paper dirt that is transported by spiral propeller member 71 accumulates there.These zones described later are the outsides at

first partition wall

77,78 and second partition wall 79.

Along with the rotation of spiral propeller member 71, transport part 16, second in multi-usage and transport part 10 and first and transport the paper dirt that part 9 wipes off and fall on the paper dirt landing part 83 and transport towards the paper dirt accumulator 84 at the two ends of spiral propeller member 71.In the process of transporting, because skew wall 81 of second partition wall 79 and another skew wall 82 are oriented to towards carriage direction the width of channel of transporting between wall and the spiral propeller member 71 are reduced gradually, can be by the paper dirt that spiral propeller member 71 transports by skew wall 81,82 towards a sidepiece partition wall 77 and 78 guiding of the other side partition wall.Like this, the paper dirt that is transported by spiral propeller member 71 can steadily and ideally move by the lower edge of a sidepiece and the other side partition wall 77,78, and can reach the paper dirt accumulator that respectively is arranged on the first partition wall downstream.In addition, a sidepiece and the other side partition wall 77,78 can prevent that the paper dirt that has accumulated in the paper dirt accumulator 84 from oppositely moving, and, can prevent to turn back to the paper dirt landing part 83 that is arranged on partition wall 77,78 upstreams along paper dirt carriage direction that is.Therefore, can obtain to transport the enough landing length of part 9 in paper dirt landing part 83 to spiral propeller member 71 from first.Like this, the paper dirt of capacity can deposit on the paper dirt landing part 83, and can be removed therefrom.

In addition, in laser printer 1, because first transport part 9 at first with the paper contact of supplying with from paper-supply section 7, therefore, more paper dirt can transport part 9 from first and discharge.Yet, because transporting part 9 around first zone of transporting the lower front side of part 9 by control wall 76 and first as one, paper dirt landing part 83 separates, therefore, paper dirt can fall in the paper supply dirt landing part 83, and is transported by spiral propeller member 71 subsequently.Therefore,, can obtain the paper dirt of removed sufficient amount, can transport part 9 first simultaneously and remove more paper dirt by guaranteeing that transporting part 9 from first has enough landing strokes to spiral propeller member 71.

In addition, because the contact area that control wall 76 to the first removes between the paper dirt roller 9b and the first sponge member 9c is higher, control wall 76 can prevent to scatter towards the outside of control wall 76 from the first paper dirt that transports part 9 landing, that is, prevent to scatter towards the remaining area of paper dirt accumulator 84 and front side diapire 64.Like this, first to transport part 9 right with the medial surface of control wall 76, formed paper dirt landing part 83.

Transporting the paper dirt that part 9 discharges from first can fall on the admittance surface 65 of a position that is positioned at spiral propeller member 71 belows.In this case, inclined-plane 67 is towards spiral propeller member 71 guiding paper dirt, and paper dirt can be involved in the spiral propeller member 71 that rotates under the side direction on inclined-plane 67.Therefore, paper dirt can be swimmingly towards 84 guiding of paper dirt accumulator.After paper dirt is transported to paper dirt accumulator 84 places, paper dirt can be discharged into the paper dirt accumulator 85 that is positioned at spine 68 from spiral propeller member 71 swimmingly, the upper end of spine 68 is lower than inclined-plane 67, and thereinto the surface of the spiral propeller member 71 of spine 68 is moved up.

As shown in Figure 2, cover component 85 is arranged on the front side diapire 64, is used for coverage control wall 76.Cover component 85 is tabular and is set at the below of the diapire 63d of demarcation strip 63.Cover component 85 is at the antetheca of main casing 2 and and be positioned at first and remove between the adjacent position of extension 62b above the paper dirt roller 9b and the first sponge member 9c and extend.One supporting part 86 is upwards erect from front side diapire 64, is used for fixing cover component 85 by screw 87.

One perforate 88 is arranged between the rear side (side in sheet conveying path 38) and extension 62b of cover component 85.This perforate is extended along first axial direction that removes paper dirt roller 9b.On the upside that cover component is covered control wall 76, can avoid transporting the paper dirt that part 9 falls effectively and scatter from first.

In addition, because perforate 88 is arranged between cover component 85 and the extension 62, second transporting part 10 and multi-usage and transport paper dirt that part 16 discharges and can introduce the paper dirt by perforate 88 and land parts 83 and the paper dirt accumulator 84 on those are positioned at cover component 85.Transport after paper dirt that part 16 discharges is introduced into paper dirt landing part 83 when transporting part 10 and multi-usage from second, these paper dirt can be transported to paper dirt accumulator 84 by spiral propeller member 71.So just, paper dirt can have been removed effectively.

In addition because cover component 85 is located highlyer than first contact area that removes between the paper dirt roller 9b and the first sponge member 9c, therefore, from first transport paper dirt that part 9 discharges can be not easily by perforate 88 to external diffusion.Like this, can more effectively remove paper dirt.

In addition, in laser printer 1, because transporting part 16, second by multi-usage transports part 10 and first and transports the paper dirt that part 9 removes the axial end portion towards spiral propeller member 71 transports by the rotation of spiral propeller member 71, therefore, paper dirt accumulator 84 can be set on the front side diapire 64.Therefore, the position in paper dirt accumulation space being set needn't be lower than front side diapire 64.For this effect, spiral propeller member 71 can be set on the connection/withdrawal space of paper supply tray 6.Like this, can carry out dismounting to paper supply tray 6 at an easy rate, can guarantee from the paper 3 that provides by paper supply tray 6, to remove paper dirt swimmingly simultaneously.

Laser printer 1 is a kind of eletrophotography type laser printer, and in this printer, it is a visual image that an electrostatic latent image is developed, and visual image is transferred on the paper 3.Therefore, paper dirt is got rid of from paper, otherwise paper dirt can be blended in the image forming part 5 in image transfer.Yet, in an embodiment of the present invention, transporting

part

9,10 and multi-usage is transported part 16 by first and second, can effectively paper dirt be removed from paper 3.In addition, even first removes that paper dirt roller 9b, second removes paper dirt roller 10b and multi-usage is removed paper dirt roller 16b reverse rotation to shift out a paper of clamping, the paper dirt that scrapes by the first sponge member 9c, the second sponge member 10c and multi-usage sponge member 16c can not enter among sheet conveying path 38, the 38a yet.Therefore, can prevent that paper dirt from adhering to down on a piece of paper.Like this, can form desirable image on a piece of paper down.

In addition, in laser printer 1, for the cleaner-less system of the eletrophotography print system of using non magnetic single component type toner, the lip-deep residual toner that remains in photosensitive drums 23 after the image transfer operation is collected by developer roll 27.If the paper dirt from paper 3 adheres on the surface of photosensitive drums 23 when image transfer is operated, paper dirt can together be collected by developer roll 27 and residual toner, and mixes together with the toners in the Delevoping cartridge 24, thereby reduces the quality of transporting image.Yet, in an embodiment of the present invention, paper dirt on the paper 3 can be effectively transports part 9,10 and multi-usage by first and second and transports part 16 and be removed in the process of image forming operation, and in addition, although first remove paper dirt roller 9b, second remove paper dirt roller 10b and multi-usage remove paper dirt roller 16b in order to shift out nipped paper backward rotation, can prevent that all paper dirt oppositely is transported in sheet conveying path 38, the 38a, wherein paper dirt scrapes by the first sponge member 9c, the second sponge member 10c and multi-usage sponge member 16c.Therefore, following a piece of paper can not be stained with paper dirt, can form desirable image, can use the residual toner of systematic collection of cleaner-less simultaneously.

As mentioned above, in laser printer 1, multi-usage is transported part 16, second and is transported part 10 and first and transport part 9 is arranged in sheet conveying path 38 substantially with vertical direction fronts, and fall by chute 39 by their gravity respectively by the paper dirt that these

parts

16,10,9 are removed, and fall on the receiving portion 65.After this, these paper dirt gather in the receiving portion 65.Therefore, transporting part 16, second in multi-usage transports part 10 and first and transports paper dirt that part 9 removes and can guide and can assemble accumulation with this simple structure.Therefore, needn't transport part for each a paper dirt accumulator all is set, this makes whole device be simplified again, and can reduce the quantity of mechanical component, thereby a kind of device of compactness is provided.

In addition, in laser printer 1, can be used as 39 utilizations of paper dirt chute owing to constitute a side of the guide plate 61 in sheet conveying path 38, this also makes a whole device be simplified, and can reduce the quantity of mechanism member, thereby a kind of device of compactness is provided.

In addition, in laser printer 1, because the first guide plate 61a is provided with the extension 62a that the upside of part 10 is transported in covering second, and the second guide plate 61b is provided with the extension 62b that the upside of part 9 is transported in covering first, extension 62a can prevent that paper dirt from falling second and transporting on the part 10, wherein paper dirt is to transport part 16 releases by being positioned at second multi-usage of transporting on the part 10, and, extension 62b can prevent that paper dirt from falling first and transporting on the part 9, and paper dirt wherein is to transport multi-usage on the part 9 and transport part 16 and second and transport part 10 and discharge by being positioned at first.Like this, just, can transport the desirable paper dirt removal operation of acquisition in

part

9 and 10 first and second for a long time.

In addition, in laser printer 1, first transports first in the part 9 removes the paper dirt on the paper with the rotation contact with paper 3 except that paper dirt roller 9b, then, adhere to the first paper dirt that removes on the paper dirt roller 9b and scraped by the first sponge member 9c, wherein the first sponge member 9c removes paper dirt roller 9b with respect to first and sheet conveying path 38 is oppositely arranged.In addition, second transports second in the part 10 removes the paper dirt on the paper with the rotation contact with paper 3 except that paper dirt roller 10b, then, adhere to the second paper dirt that removes on the paper dirt roller 10b and scraped by the second sponge member 10c, wherein the second sponge member 10c removes paper dirt roller 10b with respect to second and sheet conveying path 38 is oppositely arranged.The paper dirt that is scraped by the first and second sponge member 9c and 10c is in the face of above sheet conveying path 38 stays, and develops into paper dirt piece, each paper dirt piece since the gravity of himself fall along paper dirt chute 39.Like this, can prevent that the paper dirt that scrapes from entering in the sheet conveying path 38, can in paper dirt accumulator 84, accumulate by the first and second paper dirt that transport part 9,10 removals simultaneously.

In addition, remove paper dirt roller 16b to remove the paper dirt on the paper with the rotation contact of paper 3 in the multi-usage that multi-usage is transported in the part 16, then, adhere to the paper dirt that multi-usage removes on the paper dirt roller 16b and scraped by multi-usage sponge member 16c, wherein multi-usage sponge member 16c removes paper dirt roller 16b with respect to multi-usage and sheet conveying path 38a is oppositely arranged.The paper dirt that is scraped by multi-usage sponge member 16c falls along paper dirt chute 39 owing to the gravity of himself.Like this, can prevent that the paper dirt that scrapes from entering among the 38a of sheet conveying path, the paper dirt that the while is transported part 16 removals by multi-usage can accumulate in paper dirt accumulator.

(5) second embodiment

Below, to Figure 13 (b) a kind of device for image forming according to second embodiment of the invention is described with reference to Fig. 9, wherein identical part and member are with Fig. 1 identical label and letter representation in first embodiment shown in Fig. 8.According to the laser printer 101 of second embodiment and the different paper dirt collection structures that are of first embodiment.

Transport in the part 110 one second, as shown in figure 10, one second removes paper dirt roller 110b is driven along with the power that is input to an input gear 110h by motor (not shown), input gear 110h is used as the power input device on the end that is installed in roll shaft 110f, like this, second removes paper dirt roller 110b can rotate along the direction shown in the arrow among Fig. 9 in a location in the face of sheet conveying path 38, that is to say, rotates with paper supply direction (counter clockwise direction among Fig. 9).Paper 3 is sandwiched in second and transports roller 10a and second and remove between the paper dirt roller 110b to realize paper supply, and simultaneously, paper dirt removes paper dirt roller 110b by second and removes.

About paper dirt collection structure, the lower end of one second guide plate 161b is provided with one integratedly and admits plate 161c, this admit plate 161c substantially with the right angle from the second guide plate 161b to front curve.Admit plate 161c be positioned at paper supply tray 6 connection/disassembly path the top and extend in parallel with it.Admit the upper surface of plate 161c to be used as one and admit surface 165, this admittances surface is applicable to that admittance transports part 16, second by multi-usage and transport part 10 and first and transport paper dirt part 9 removals and that fall from these parts.

One demarcation strip 163 is with predetermined positioned at intervals the place ahead at the second guide plate 161b.Demarcation strip 163 comprise a side plate 163c who extends with vertical direction and one substantially with the right angle from the lower end of side plate 163c prone base plate 163d.In addition, tabular fixed part 163a extends upward from the front end bending of base plate 163d, and a paper dirt that will be described to below being used for fixing transports plate 166 and one and transports drive part 167.

Laser printer 101 also is provided with a paper dirt accumulator 168, can accumulate in this accumulator 168 because self gravitation and transport part 16, second from multi-usage and transport part 10 and first and transport part 9 and fall the paper dirt of admitting on the surface 165.Printer 101 also is provided with paper dirt and transports plate 166 and transport drive part 167, transports plate 166 and is used for transporting to paper dirt accumulator 168 and is positioned at the paper dirt of admitting on the surface 165, is used to drive paper dirt and transports plate 166 and transport drive part 167.

As shown in figure 12, paper dirt accumulator 168 is positioned at multi-usage and transports part 16, second and transport part 10 and first and transport part 9 belows.Paper dirt accumulator 168 is arranged on the place, space of the outside of the Width end measure of admitting surface 165, and like this, the described paper dirt of admitting on the surface 165 of falling finally can be accumulated in the accumulator 168.

Paper dirt transports plate 166 and is positioned at paper supply tray connection/disassembly path top and is positioned at the top of admitting surface 165.When as shown in figure 12 from forward observation, plate 166 comprises the base portion 169 of a picture T shape plate, and comprise that as shown in Figure 9 is roughly a L shaped lamellar wiping board 170, this wiping board is given prominence to backward integratedly and is extended downward first position of transporting under the part 9 from the middle part of the Width of the bottom of base portion 169.As shown in figure 11, paper dirt transports plate 166 and be T shape in plan view, and in this plan view, wiping board 170 is outstanding perpendicular to the center section of the Width of base portion 169.Base portion 169 is fixed on the tooth bar 174 that transports drive part 167 by some screws 171 that insertion paper dirt transports the fixed part 163a of the demarcation strip 163 between plate 166 and the tooth bar 174.Fixed part 163a is formed with an elongated horizontally extending slit 163b, and screw 171 extends by this slit 163b.Paper dirt transports plate 166 and can back and forth move horizontally along horizontally extending slit 163b along with the tangential movement of tooth bar 174.As shown in Figure 9, the lower end of wiping board 170 separates a preset distance (about 2 millimeters) with admitting surface 165, like this, in the to-and-fro movement process of wiping board 170, the lower end will be not with admit surperficial 165 sliding contacts.

As shown in Figure 9, transport drive part 167 and be arranged on the top that paper dirt transports plate 166 and paper dirt accumulator 168, and

transport part

9,10 by demarcation strip 163 and first and second and transport portion 16 with multi-usage and separate.Transport drive part 167 and comprise a tramming conveyor structure 194 (referring to Figure 13 (a) and 13 (b)), first conical gear 172, a composite gear 173 and a tooth bar 174.

Power transmitting mechanism 194 is along a sidewall setting of main casing 2, and comprises an input gear 177, a conversion gear part 178 and an output gear 179.

Input gear 177 is fixedly mounted on the end of input shaft 180, and input shaft 180 can be by motor (not shown) along a direction driven in rotation.Input gear 177 meshes with first conversion gear 181 of conversion gear part 178, and this will further describe hereinafter.

Conversion gear part 178 comprises first conversion gear 181, one second conversion gear 182, an oscillating structural member 183 and one the 3rd conversion gear 184.First conversion gear 181 has first outer rotor 185 and the annular wheel 186 that diameter is less that diameter is bigger, outer rotor 185 and 177 engagements of input gear, annular wheel 186 be with first outer rotor 185 that be wholely set with one heart and with 182 engagements of second conversion gear.

Second conversion gear 182 has the gear teeth, first annular wheel, 186 engagements of these gear teeth and first conversion gear 181.Body from a wheel of second conversion gear 182 extends along its axial direction columniform sleeve pipe 187 in a position that the center of rotation from second conversion gear 182 is offset out.Sleeve pipe 187 be formed on oscillating structural member 183 in 188 loose the cooperating of a slit.

Oscillating structural member 183 is a kind of board member of elongated fan shape.Oscillating structural member 183 has a lower end, and this lower end is formed with an arc toothed portion 189, one the 3rd annular wheel, 192 engagements of this arc tooth and the 3rd conversion gear 184, and this will be described hereinafter.Slit 188 is vertically and at the middle place of its Width forming along oscillating structural member 183.A pivotable supporting member 190 is arranged between the end and arc toothed portion 189 of slit 188.Therefore, oscillating structural member 183 is pivotally by pivotable supporting member 190 supportings.And the sleeve pipe 187 of second conversion gear 182 cooperates with slit 188 loosely.

The 3rd conversion gear 184 has the 3rd outer rotor 191 and the 3rd annular wheel 192 that diameter is less that diameter is bigger, 179 engagements of this outer rotor and output gear, and this annular wheel and the 3rd outer rotor 191 one and be provided with one heart and mesh with the arc toothed portion 189 of oscillating structural member 183.

Output gear 179 is fixedly mounted on an end of the output shaft 193 of first conical gear, 172 transmission power.Output gear 179 is applicable to from the 3rd outer rotor 191 of the 3rd conversion gear 184 and transmits power to first conical gear 172.

As shown in figure 11, first conical gear 172 is installed in from output gear 179 and transmits on the other end of output shaft 193 of power.First conical gear 172 and second conical gear, 176 engagements perpendicular to the composite gear 173 of first conical gear, 172 orientations.

As shown in Figure 9, composite gear 173 has one and is wholely set and is positioned at its radially inner side with the pinion wheel 175 of tooth bar 174 engagement and second conical gear, 176, the second conical gears 176 and pinion wheel 175.Pinion wheel 175 can rotate around horizontal axis.

Tooth bar 174 has rack tooth 174a, and these rack tooths 174 can mesh with the pinion wheel 175 of composite gear 173.Tooth bar 174 has a kind of elongated rectangular shape, and it is big slightly that the longitudinal length of this rectangular shape removes the width of paper dirt roller 9b than first.Tooth bar 174 is parallel to first axial direction that removes paper dirt roller 9b and extends, in this state, and rack tooth 174a and pinion wheel 175 engagements.Along with the rotation of pinion wheel 175, tooth bar 174 can move back and forth along first axial linear of removing paper dirt roller 9b, and the fixed part 163a sliding contact of the rear surface of tooth bar 174 and demarcation strip 163.

Transporting in the drive part 167 shown in Figure 13 (a) and 13 (b), when motor (not shown) along the rotation of a direction when input gear 177 transmits, rotate with first outer rotor 185 of first conversion gear 181 of input gear 177 engagements.Therefore, second conversion gear 182 rotates by the rotation of first annular wheel 186 of first conversion gear 181, and sleeve pipe 187 is made circular motion like this.Like this, because the cooperation between the slit 88 of the sleeve pipe 187 of second conversion gear 182 and oscillating structural member 183, oscillating structural member 183 laterally pivots around pivotable supporting member 190 and moves, thereby makes 189 to-and-fro movements of arc toothed portion.Therefore, with the rotation direction of the 3rd annular wheel 192 of arc toothed portion 189 engagement along the both direction periodic transformation.Like this, the rotation direction of output gear 179 is by 191 periodic transformations of the 3rd outer rotor.

As shown in figure 11, when the reciprocal rotation of output shaft 193 was sent to tooth bar 174 by first conical gear 172, second conical gear 176 and pinion wheel 175, tooth bar 174 along continuous straight runs were with predetermined cyclic movement.Therefore, as shown in figure 11, be fixed to paper dirt on the tooth bar 174 by screw 171 and transport plate 166 and can move horizontally admitting on the surface 165 along first axial direction that removes paper dirt roller 9b between the stroke end that Figure 12 two is shown in dotted line.Each stroke end is positioned at first except that each axial end portion of paper dirt roller 9b.Like this, wiping board 170 can be driven, and falls the paper dirt of admitting on the surface 165 thereby linearly back and forth wipe out to property, even the paper dirt of the position of erasable first except that the axial end portion of paper dirt roller 9b.

Comprise from input gear 177 providing deceleration in such a way to the drive part 167 that transports that output gear 179 gears transmit, that is, the reciprocating speed that paper dirt transports plate 166 is no more than 100 mm/second.

In laser printer 101, transport drive part 167 and be arranged on the top that paper dirt transports plate 166 and paper dirt accumulator 168, and isolate by demarcation strip 163.Therefore, demarcation strip 163 can stop paper dirt to enter to transport in the drive part 167 effectively, wherein paper dirt is to transport part 16, second by the effect of gravity from multi-usage to transport part 10 and first to transport part 9 that discharge or to transport plate 166 by paper dirt that transport or be accumulated in the accumulator 168.Like this, can eliminate, thereby a kind of stable work is provided, can provide sufficient paper dirt to remove operation thus for a long time owing to paper dirt enters the operation troubles of transporting drive part 167 that causes.

In addition, in laser printer 101, paper dirt transports wiping board 170 wipings of plate 166 by paper dirt and is transported in the paper dirt accumulator 168, and wherein wiping board 170 is that along continuous straight runs is reciprocating.Therefore, need not the conveyer of any complexity, just can realize transporting of stable paper dirt with a kind of simple structure.

In addition, wiping board 170 is that to remove the axial direction rectilinearity ground of paper dirt roller 9b along first reciprocating.Therefore, with the space of minimum and simple structure just can realize towards accumulator 168 desirable transport paper dirt, and do not have any paper dirt and remain in and admit on the surface 165.

Suppose that wiping board 170 is not a property reciprocating motion type linearly, but around the reciprocal rotation of pivot.In this situation of the latter, for reduce wiping less than the zone, need bigger pivotally supported track, this will make whole device seem huge.Avoid huge structure in order not make the pivot pivot region become big, can use a kind of vane member of flexibility, distortion or crooked when this vane member can contact with relative member.Yet, still need complicated structure to assemble flexible blade, and the quantity of mechanism element can increase.

On the contrary, if but wiping board 170 is provided with along the first to-and-fro movement ground, axial direction rectilinearity ground that removes paper dirt roller 9b as among second embodiment, can paper dirt be transported to the space of the minimum in the accumulator 168 with simple structure and minimum space with realizing ideal, and do not exist wiping less than the zone.

In addition, be that low speed moves because paper dirt transports plate, be no more than 100 mm/second, being in the paper dirt of admitting on the surface 165 can not be transported in the accumulator 168 dispersedly.Therefore, can further avoid paper dirt to enter and transport in the drive part 167, thereby the paper dirt that can realize ideal is for a long time removed operation.

In addition, because wiping board 170 separates predetermined gap (about 2 millimeters) with admittance surface 165, and therefore the to-and-fro movement of wiping board along continuous straight runs, can eliminate wiping board 170 with the rubbing contact of admitting surface 165, thereby avoids wiping board 170 damages.Like this, the paper dirt permanance of transporting the enhancing of plate can realize that paper dirt effectively transports.In addition, when to fall the paper dirt of admitting on the surface 165 be not tiny particle but bulk, no matter predetermined gap how, and paper dirt still can be wiped by wiping board 170.The gap can not influence transporting of paper dirt piece.

In addition, in laser printer 101, because transporting part 16, second by multi-usage transports part 10 and first and transports paper dirt that part 9 removes and transport transporting of plate 166 by paper dirt and run up in the paper dirt accumulator 168 that is arranged on the place, Width end that admits surface 165, therefore, directly a position below admittance surface 65 is provided with an accumulation space.Therefore, paper dirt transports the top that plate 166 can be positioned at the connection/disassembly path of paper supply tray 6, also effectively paper dirt is supplied with the paper that comes from paper supply tray 6 and removes, and guarantees paper supply tray 6 connection/dismounting stably equally.

In addition, in laser printer 101, be input to the driving force that the driving force of importing in the gear 177 can convert vibration-direction by the conversion gear part 178 in the power transmitting mechanism 195 to along a direction, after this, to-and-fro movement driving force outputs to paper dirt by output gear 179 and transports on the plate 66.Like this, unidirectional driving force can become the driving force of vibration-direction with a kind of simple Structure Conversion, thereby makes paper dirt transport plate 166 to-and-fro movements.

Though the present invention describes in detail with reference to specific embodiment, without departing from the spirit and scope of the present invention, those skilled in the art can carry out variations and modifications apparently.

For example, in the above-described embodiments, only be provided with one first and transport part 9 and one second and transport part 10.Yet, can be provided with a plurality of first and transport part and a plurality of second transport part.Perhaps, first and second transport the part one of a plurality of parts of transporting can be set.

In addition, in the illustrated embodiment, be provided with first and remove first of paper dirt roller 9b and transport part 9 and be arranged on and be provided with second and remove the upstream that second of paper dirt roller 10b transports part 10.Yet, be provided with second and remove second of paper dirt roller 10b and transport part 10 and also can be arranged on and be provided with first and remove the upstream that first of paper dirt roller 9b transports part 9.In this in the back situation, the paper dirt zone that friction is produced to separating pad member 13 will be owing to removing paper dirt roller 10b contact and along the Width of paper 3 expansion arranged slightly with second thus, first remove the width of paper dirt roller 9a and the first sponge member 9c width should to be arranged on second width that transports in the situation of this configuration structure of part 10 upstreams big than transporting part 9 first.

In addition, in the above-described embodiments, be a kind of justified roll shape formula for what use to first paper that transports part 9 feedings, and spiral propeller member 71 is used for transporting paper dirt towards two axial end portion from paper-supply section 7.Except that this configuration structure, can use a side alignment roller pattern and spiral propeller member 71 and be used for only transporting paper dirt to a side opposite with paper alignment roller part.

In addition, in first embodiment, to be surfaces of making spiral propeller member 71 transporting under the side direction of part 9 and moving in the face of first the rotation direction of spiral propeller member 71.Yet, if admit the spiral receiving portion and first on surface 65 transport between the part 9 apart from the along continuous straight runs long enough, the rotation direction of the shaft component 72 of spiral propeller member 71 without limits, but the surface of spiral propeller member can move up towards first side of transporting part 9.

In addition, in first embodiment, second partition wall 79 of control wall 76 comprises midfeather 80 that the spiral propeller member 71 that is parallel to and separates with preset distance with it extends, a sidepiece skew wall 81 and the other side skew wall 82 by extending towards spiral propeller member 71 from the end of midfeather 80 at the end bent of midfeather.These walls mutually combine and are integral.Yet second partition wall is not limited only to said structure.For example, can use a plurality of walls to make midfeather, and between the adjacent wall slit can be arranged.Perhaps, can form a perforate or notch in vertical pars intermedia office of second partition wall 79.

In addition, in the above-described embodiments, first anti-reversely transport member 9m, the second anti-reverse anti-reverse member 16m that transports of member 10m and multi-usage that transports removes with corresponding first that paper dirt roller 9b, second removes paper dirt roller 10b and multi-usage is removed paper dirt roller 16b setting spaced apart respectively.Yet, these prevent that

member

9m, 10m, 16m can be by allowing paper dirt to constitute these and prevent member and contact with corresponding roller at just the turn over brush, film and the supatex fabric that are transported in the journey that remove

paper dirt roller

9b, 10b, 16b, but can prevent that paper dirt from passing through in the counter-rotational process of these rollers.

In addition, in the above-described embodiments, second removes

paper dirt roller

10b, 110b has the width perpendicular to the paper supply direction, and the width of this width print paper 3 is used to remove the paper dirt on all surface of paper 3.Yet the paper dirt that paper produced when cutting off is specifically located in and cuts off near the edge (, the transverse edge part of paper 3).Therefore, as shown in figure 14, on the roll shaft 10f ' of the position corresponding, be provided with two second and remove paper dirt roller 10b ', be used for removing paper dirt in the zone corresponding at least with the transverse edge part of paper 3 with the transverse edge part of paper 3.

In addition, the present invention is specially adapted to utilize friction and realizes the paper-supply section 7 that paper supply separates, and this friction is easy to cause paper dirt.Yet the present invention also can be used for not adopting friction separates other paper piece-rate system, as utilizes the system of ratchet or utilize the system on a slope.

Claims

1. device for image forming that is used on image recording media forming image is characterized in that described device comprises:

One paper-supply section, described paper-supply section comprise a paper feed roller and a separating pad, and they are used for every image recording media of between grip(per) feed;

One image forming part, described image forming part forms an image on from the image recording media of paper-supply section;

One sheet conveying path, the described path of transporting extends to the image forming part from paper-supply section, and has formed a paper supply direction; And

At least two paper dust removing units, described unit comprises:

One first paper dust removing unit, described first paper dust removing unit are arranged on an other position of sheet conveying path, and can contact with image recording media, are used for removing paper dirt from the image recording media that partly transports along the sheet conveying path towards image forming; And

One second paper dust removing unit, described second paper dust removing unit is arranged on an other position of sheet conveying path, on the paper supply direction, this position is different with the position of first paper dust removing unit, and also can contact with image recording media, equally also be used for removing paper dirt from the image recording media that partly transports along the sheet conveying path towards image forming

First paper dust removing unit comprises that one first removes paper dirt member, and described member contacts with image recording media in the process that image recording media transports along the sheet conveying path; And

Wherein, second paper dust removing unit comprises that one second removes paper dirt member, and described member contacts with image recording media along transporting in the process of sheet conveying path at image recording media, and each Width of image recording media and separating pad is vertical with the paper supply direction, and

Wherein, first removes paper dirt member has a zone, and this zone is used for removing paper dirt from image recording media at least in the zone corresponding with the width of separating pad; And

Wherein, second removes paper dirt member has a zone, and paper dirt is removed from the whole surface of image recording media in this zone.

2. device for image forming as claimed in claim 1 is characterized in that, second paper dust removing unit has a width on the direction vertical with the paper supply direction, and this width is greater than the width of image recording media.

3. device for image forming as claimed in claim 1 is characterized in that, first removes paper dirt member has a width on the direction vertical with the paper supply direction, and this width is greater than the width of separating pad, and less than the width of image recording media.

4. device for image forming as claimed in claim 1 is characterized in that, second paper dust removing unit is arranged on the downstream of first paper dust removing unit along the paper supply direction.

5. device for image forming as claimed in claim 1 is characterized in that, first width that removes paper dirt member than second except that the width of paper dirt member little.

6. device for image forming as claimed in claim 1 is characterized in that, described device comprises a driving force input link, and described member removes paper dirt member and links to each other with second at least, is used to drive second and removes the rotation of paper dirt member.

7. device for image forming as claimed in claim 1, it is characterized in that, paper-supply section also comprises a paper supply tray, numerous image recording medias pile a pile on paper supply tray, paper feed roller and separating pad are isolated the paper of a topmost and partly supplied with the paper of this topmost towards image forming from the paper sheet stacking thing; And

Wherein, first remove paper dirt member and second and remove paper dirt member and be arranged on the downstream of paper feed roller and do not contact with paper feed roller along the paper supply direction.

8. device for image forming as claimed in claim 1, it is characterized in that, first paper dust removing unit also comprises one first scraper member, and described first scraper member and first is removed paper dirt member and is provided with Face to face, is used to scrape stick to first except that the paper dirt on the paper dirt member; And

Wherein second paper dust removing unit also comprises one second scraper member, and described second scraper member and second is removed paper dirt member and is provided with Face to face, is used to scrape stick to second except that the paper dirt on the paper dirt member.

9. device for image forming as claimed in claim 8 is characterized in that, first and second remove paper dirt member has zone in the face of the sheet conveying path, and this zone can be moved along the paper supply direction; And

Wherein, first and second scraper member lay respectively at the below of removing the minimum surface of paper dirt member near first and second.

10. device for image forming as claimed in claim 9 is characterized in that, first removes paper dirt member and second can be in positive veer rotation identical with the paper supply direction and the reverse direction rotation opposite with the paper supply direction except that paper dirt member; And

Wherein, first paper dust removing unit also comprises the one first anti-reverse member that transports, the described first anti-reverse member that transports is arranged between one first contact position and one second contact position, first contact position removes between paper dirt member and the image recording media first, and second contact position removes between the paper dirt member and first scraper member first, and the described first anti-reverse member that transports is used for preventing transporting towards the sheet conveying path from the paper dirt that first scraper member discharges in the first backward rotation process of removing paper dirt member.

11. device for image forming as claimed in claim 10, it is characterized in that, second paper dust removing unit also comprises the one second anti-reverse member that transports, the described second anti-reverse member that transports is arranged between one first contact position and one second contact position, first contact position removes between paper dirt member and the image recording media between second, and second contact position removes between the paper dirt member and second scraper member between second, and the described second anti-reverse member that transports is used for preventing transporting towards the sheet conveying path from the paper dirt that second scraper member discharges in the second backward rotation process of removing paper dirt member.

12. device for image forming as claimed in claim 1, described device also comprises:

One first transports roller, and the described roll surface that transports removes the setting of paper dirt member to first, removes paper dirt member with first and seizes on both sides by the arms and transport image recording media; And

One second transports roller, and the described roll surface that transports removes the setting of paper dirt member to second, removes paper dirt member with second and seizes on both sides by the arms and transport image recording media.

13. device for image forming as claimed in claim 1, it is characterized in that, described device also comprises a paper recycle sections, the paper turning zone that described recycle sections comprises a paper recirculation path and is arranged on paper recirculation path place, the paper recirculation path has a upstream extremity and a downstream end, described upstream extremity partly links to each other with image forming, be used to admit and partly discharge from image forming, one surface has been formed with the image recording media of image, and image recording media is transported to the paper turning zone, and the bound fraction of downstream end in the upstream of image forming part combines with the sheet conveying path, be used for from the paper turning zone to image forming part feeding image recording media, on another surface of image recording media, to form another image, first removes the upstream that paper dirt member is set at this bound fraction, and second remove paper dirt member and be set at this bound fraction downstream.

14. device for image forming as claimed in claim 1, it is characterized in that, described device also comprises a paper dirt storage compartment, this part is used for concentrating therein storage paper dirt, and wherein paper dirt is removed and then discharged from each paper dust removing unit from image recording media by at least two paper dust removing unit.

15. device for image forming as claimed in claim 14 is characterized in that, paper dirt storage compartment present position is lower than at least two paper dust removing units, is used for admitting therein the paper dirt that is discharged and fallen owing to the gravity of paper dirt by each paper dust removing unit.

16. device for image forming as claimed in claim 15 is characterized in that, described building mortion also comprises a paper dirt deposition region, and described deposition region is provided with lowlyer than at least two paper dust removing units.

17. device for image forming as claimed in claim 16, it is characterized in that, described device for image forming also comprises a paper dirt delivery unit, and described paper dirt delivery unit is provided with adjacent to paper dirt deposition region, and the paper dirt that is used for depositing on the paper dirt deposition region is transported to paper dirt storage compartment.

18. device for image forming as claimed in claim 17 is characterized in that, paper dirt storage compartment is arranged on each side place of paper dirt deposition region along the Width of image recording media, playing the function of a pair of paper dirt storage compartment, and

Wherein, paper dirt delivery unit comprises a wiping board, and described wiping board can move back and forth on the part of whole paper dirt deposition region and a pair of paper dirt storage compartment along the Width of image recording media.

19. device for image forming as claimed in claim 17 is characterized in that, paper dirt storage compartment is arranged on each side place of paper dirt deposition region along the Width of image recording media, playing the function of a pair of paper dirt storage compartment, and

Wherein paper dirt delivery unit comprises a spiral propeller member, described spiral propeller member extends at the Width of a part of upper edge image recording media of whole paper dirt deposition region and a pair of paper dirt storage compartment, and the spiral propeller member can rotate around its axis.

20. device for image forming as claimed in claim 17 is characterized in that, described building mortion also comprises a control wall member, and described member is arranged to intersect with paper dirt delivery unit, and described control wall member separates paper dirt deposition region and paper dirt storage compartment.

21. device for image forming as claimed in claim 16 is characterized in that, described device also comprises a paper dirt skewed slot, and described skewed slot is used for the whereabouts motion of downward guiding paper dirt and is used for towards paper dirt deposition region guiding paper dirt.

22. device for image forming as claimed in claim 21 is characterized in that, the sheet conveying path comprises a guide plate, and described guide plate has the surface of guiding image recording media motion; And

Wherein, guide plate has an apparent surface as paper dirt skewed slot.

23. device for image forming as claimed in claim 22, it is characterized in that, guide plate be provided with a top that is arranged on first paper dust removing unit and with its next-door neighbour's first extension board and be arranged on second paper dust removing unit the top and with its next-door neighbour's second extension board.

24. device for image forming as claimed in claim 1 is characterized in that, described at least two paper dust removing units are arranged in a side in sheet conveying path along vertical direction.

25. device for image forming as claimed in claim 1 is characterized in that, image forming partly comprises an eletrophotography system component, and wherein, an electrostatic latent image is developed the visual picture that forms and is transferred on the image recording media.

26. device for image forming as claimed in claim 25 is characterized in that, image forming partly comprises:

One photosensitive drums, electrostatic latent image are formed on this photosensitive drums; And

One developing apparatus, described developing apparatus is supplied with developer to photosensitive drums, and described developer is made of non-magnetic mono-component type developer; After image was transferred on the image recording media from photosensitive drums, developing apparatus was also collected the remaining developer that remains on the photosensitive drums.

27. device for image forming as claimed in claim 1 is characterized in that, each Width of image recording media and separating pad is vertical with the paper supply direction, and

Wherein, first removes paper dirt member has a zone, and this zone is used for removing paper dirt from image recording media at least in the zone corresponding with the width of separating pad, and

Wherein, second removes paper dirt member has a zone, and this zone is used for removing paper dirt from image recording media at least in the zone corresponding with the transverse edge part of image recording media.

28. device for image forming as claimed in claim 1, it is characterized in that, also comprise: first and second scraper member, described first and second scraper member and first and second are removed paper dirt member and are contacted, be used for removing paper dirt member and wipe paper dirt off from first and second, first and second remove paper dirt member identical with the paper supply direction be rotated in the forward direction and be rotated in the forward opposite oppositely being supported rotationally of direction; And

The anti-reverse member that transports, the described anti-reverse member that transports is separately positioned between first contact position and second contact position, described first contact position is formed on first and second and removes between paper dirt member and the image recording media, and described second contact position is formed on first and second except that between the paper dirt member and first and second scraper member, and the described anti-reverse member that transports is used for preventing from oppositely to transport towards the sheet conveying path from the paper dirt that first and second scraper member discharge in first and second processes of removing the reverse rotation of paper dirt member.

29. device for image forming as claimed in claim 28, it is characterized in that, the anti-reverse member and first and second that transports is provided with the gap except that between the paper dirt member, gap size permission paper dirt removes just turning in the journey of paper dirt member first and second therefrom to be passed through, but can prevent that paper dirt from therefrom passing through except that in the Umklapp process of paper dirt member first and second.

30. device for image forming as claimed in claim 29 is characterized in that, from 0.2 to 2 millimeter of the length range in this gap.

31. device for image forming as claimed in claim 28, it is characterized in that, the anti-reverse member that transports has a tip portion that certain orientation is arranged, a tangent line and and an extension line of the orientation equidirectional of tip portion between an angle forming, wherein tangent line removes on the paper dirt member except that the line between the center of rotation of paper dirt member is positioned at first and second with respect to being connected the most advanced and sophisticated of tip portion and first and second, and this angle is no more than 90 degree.

32. device for image forming as claimed in claim 31 is characterized in that, tip portion is arranged on the upstream of line that the center of rotation of paper dirt member is removed at the tip and first and second that is connected tip portion along the first and second positive veers of removing paper dirt member.

33. device for image forming as claimed in claim 31 is characterized in that, the anti-reverse tip portion that transports member is oriented at first and second except that directly removing the paper dirt that is transporting on the paper dirt member in the face of first and second in the backward rotation process of paper dirt member.

34. device for image forming as claimed in claim 28 is characterized in that, the anti-reverse member that transports has the width that edge direction vertical with the paper feed direction extended, this width than first and second except that the width of paper dirt member big.

35. device for image forming as claimed in claim 28 is characterized in that, the anti-reverse member that transports has the width that an edge direction vertical with the paper feed direction is extended, and this width is bigger than the width of first and second scraper member.

36. device for image forming as claimed in claim 28 is characterized in that, described device comprises that also a supporting first and second removes the housings of the paper dirt member and first and second scraper member, anti-reversely transports member and housing is wholely set.

37. device for image forming as claimed in claim 28 is characterized in that, the anti-reverse member that transports has in the face of first and second and removes a side of paper dirt member and as the ways opposite side of guiding paper dirt downwards, paper dirt is fallen anti-reverse transporting on the member.

38. device for image forming as claimed in claim 28, it is characterized in that, described device comprises that also first and second transport member, and described first and second transport member and first and second removes paper dirt member and contact and be used for the edge and transport the path and transport image recording media.

39. device for image forming as claimed in claim 1 is characterized in that, also comprises:

One paper dirt delivery unit, described paper dirt delivery unit is provided with lowlyer than first paper dust removing unit, is used for transporting the paper dirt that falls from first paper dust removing unit along paper dirt carriage direction; And

One control wall, described control wall is arranged on the part of paper dirt delivery unit, is used to control paper dirt flow.

40. device for image forming as claimed in claim 39, it is characterized in that, described device also comprise one be provided with than first paper dust removing unit low paper dirt deposition region, and one be arranged on the other paper dirt storage compartment in paper dirt deposition region along the image recording media Width; And

Wherein, the control wall comprises a wall part, described wall part is separated paper dirt deposition region and paper dirt storage compartment, the paper dirt that falls from the first paper dirt unit is admitted in paper dirt deposition region, transport next paper dirt from paper dirt deposition region and store in the paper dirt storage compartment by paper dirt delivery unit, shape and size permission paper dirt in the process that paper dirt transports by paper dirt delivery unit of wall part is fed into paper dirt storage compartment from paper dirt deposition region, but can prevent that paper dirt from moving to paper dirt deposition region from paper dirt storage compartment.

41. device for image forming as claimed in claim 39, it is characterized in that, paper dirt delivery unit comprises a rotating screwfeed member, and described screwfeed member has a pivot center, and paper dirt is to transport along the direction of pivot center by the rotation of screwfeed member.

42. device for image forming as claimed in claim 41 is characterized in that, described rotating screwfeed member comprises:

One rotating shaft, described rotating shaft can and have a center section and both ends around its axis rotation;

One first spiral propeller part, described first spiral propeller partly have one first hand of spiral and are formed on the right half part of rotating shaft; And

One second spiral propeller part, described second spiral propeller partly have second hand of spiral opposite with first hand of spiral, and are formed on the left-half of rotating shaft, and thus, paper dirt transports towards two axial ends of rotating shaft.

43. device for image forming as claimed in claim 42 is characterized in that, paper dirt deposition region is positioned at the pars intermedia office of rotating shaft, and paper dirt storage compartment comprises two paper dirt storage areas adjacent to the axial end portion setting of rotating shaft.

44. device for image forming as claimed in claim 41 is characterized in that, rotating screwfeed member has a zone of facing in the face of first paper dust removing unit, should move down in the face of the rotation of zone by the screwfeed member.

45. device for image forming as claimed in claim 44, it is characterized in that, described device also comprises: a paper dirt receiving portion, described receiving portion comprises paper dirt deposition region, paper dirt receiving portion is positioned at the below of paper dirt delivery unit, paper dirt receiving portion comprises the recess of a longitudinal extension, and paper dirt delivery unit is positioned in this recess; An inclined-plane, described inclined-plane is in a longitudinally-extending sides of recess and right with a side of the longitudinal extension of feeding member; And a spine, described spine is positioned at the opposition side on this inclined-plane with respect to this feeding member; The feeding member has a longitudinally-extending sides, the inclined-plane is moved below this extension side direction, and the feeding member has another longitudinally-extending sides, and this moves spine above extension side direction, and the aspect ratio inclined-plane of spine is low.

46. device for image forming as claimed in claim 45, it is characterized in that, described device also comprises a paper-supply section, described paper-supply section is used for partly supplying with image recording media to image forming, and wherein, first paper dust removing unit is configured to, and it at first contacts with image recording media after paper-supply section is supplied with when medium.

47. device for image forming as claimed in claim 39 is characterized in that, the control wall comprises:

One first partition wall, described first partition wall separates paper dirt delivery unit along the direction that the length direction with first partition wall intersects, and

One second partition wall, described second partition wall link to each other with first partition wall and with paper dirt delivery unit across a space, the above-mentioned space between second partition wall and the paper dirt delivery unit narrows down gradually towards paper dirt carriage direction.

48. device for image forming as claimed in claim 39 is characterized in that, first paper dust removing unit comprises:

One removes paper dirt member, and described member turns and can contact with image recording media; And

One scraper member, described scraper member contacts with removing paper dirt member, is used for scraping off paper dirt from removing paper dirt member.

49. device for image forming as claimed in claim 48 is characterized in that, the rotating speed that the rotating ratio that paper dirt delivery unit provides removes paper dirt member is little.

50. device for image forming as claimed in claim 48 is characterized in that, removes between paper dirt member and the scraper member to have contact portion, the control wall has the upper end higher than this contact portion.

51. device for image forming as claimed in claim 48 is characterized in that, described device also comprises the cover component of the upper space of a coverage control wall.

52. device for image forming as claimed in claim 49, it is characterized in that, described device also comprises one second paper dust removing unit, this unit be arranged on than control wall more the top the position in, and be in the position different with first paper dust removing unit along the paper supply direction, this second paper dust removing unit is used for removing paper dirt from the image recording media that will be fed on the image forming part.

53. device for image forming as claimed in claim 52 is characterized in that, also comprises a cover component, cover component is formed with a perforate, and the paper dirt that falls from second paper dust removing unit enters the inner space of controlling wall by this perforate.

54. device for image forming as claimed in claim 53 is characterized in that, described perforate is located than the contact portion height between paper dirt member and the scraper member of removing at first paper dust removing unit.

55. device for image forming as claimed in claim 54, it is characterized in that, described device also comprises a pallet, described pallet removably is provided with respect to main casing, be used for piling up numerous image recording medias thereon, main casing is formed with a connection/disassembly path that is used for pallet, and paper dirt delivery unit is arranged on the top of connection/disassembly path.