CN201066436Y - Carbon powder canister for laser printer - Google Patents

Abstract

The utility model relates to a powdered carbon drum of a laser printer, which comprises a powder storage bin and a waste powder bin. The waste powder bin is provided with a waste powder inlet and a corresponding control switch, wherein, the waste powder inlet is a through hole on the tube wall of a small circular tube which is invaginated into the waste powder bin and arranged on the sidewall jointed with the waste powder outlet of an imaging unit. The control switch consists of a seal plate and a spiral spring. Both sides of the through hole of the tube wall, which are along the circumferential direction of the small circular tube, are provided with slide grooves which are parallel to each other and are extended along the axial direction of the small circular tube. Along the diametrical direction of the small circular tube, the seal plate is positioned on the tube wall of the small circular tube and movably supported in the slide grooves. The seal plate is provided with a stress sheet which penetrates the through hole of the tube wall and then is inserted into the small circular tube. One end of the spring is fastened on the axial end wall of the small circular tube which faces the cavity of the waste powder bin, and the other end is fastened on the seal plate. The spring is axially parallel to the axial direction of the small circular tube. The residual powder-collecting control switch of the powdered carbon drum is simple, reliable and practical.

Description

The carbon dust tube that is used for laser printer

Technical field

The utility model relates to for example carbon dust tube of laser printer of electrophotographic image forming, particularly has the puddle support that is used to transmit carbon dust, is used to store and the powder-storage bin of supply toner and being used to holds the carbon dust tube of the waste powder hopper of the remaining carbon dust that is produced by photosensitive drums.

Background technology

Electrophotographic image forming, laser printer for example, its use value is by containing the photosensitive drums that the laser beam flying irradiation that predetermined information is arranged has predetermined potential, form electrostatic latent image at photosensitive drum surface, and then the developer of this electrostatic latent image with predetermined carbon dust and so on developed, be transferred to the carbon dust image that is about to obtain on the recording medium such as paper through developing, afterwards again the image fixing of transfer printing acquisition, become the visual image that naked eyes can be observed, realize the conversion of image--signal--between the image.

Common laser printer is provided with in its casing or includes charging roller, photosensitive drums, laser scanning mechanism, developer roll, transfer roll and fixing roller etc.These constitute the unit according to manufacturer's purpose of design and technical thought separately, finally form the different parts of integrated level.For example, consider factors such as task that each parts is born and technical life, charging roller, photosensitive drums etc. is prepared into an independently image forming process unit, laser scanning mechanism, transfer roll and fixing roller then directly are installed in the printer respectively, developer roll and powder feeding roller etc. are integrated into an independently developing cell, also claim developing apparatus or Delevoping cartridge.After image-generating unit and developing cell are combined into a powder box that possesses image transitions ability and image developing ability simultaneously, standby in the printer of just can packing into.Perhaps in view of holding the disposable operating characteristic of storing up carbon dust in the developing apparatus, and the developing apparatus concentrated area that comprises developer roll, powder feeding roller, powder-storage bin and waste powder hopper etc. is designed to a relatively independent replaceable member, make it with comprising the image forming process unit of charging roller, photosensitive drums or comprising that the laser printer of image forming process unit keeps dismountable movable connection method.Perhaps further powder-storage bin and waste powder hopper are designed to individual member, make it keep dismountable movable connection method with the developing cell that comprises developer roll, powder feeding roller, in time changing carbon dust, the durability that makes full use of parts such as developer roll facilitates.

In the course of the work, photosensitive drums charges to predetermined potential by charging roller, and response is formed corresponding to the electrostatic latent image for the treatment of print image on its cylindrical surface by the irradiation of laser scanning mechanism emitted laser bundle.

Store developer for example toner or carbon dust within it in the container that the carbon dust tube is established, and then utilize powder feeding roller and developer roll that carbon dust is sent to photosensitive drums to have the corresponding region of electrostatic latent image and be adsorbed in this, obtain the visual carbon dust image that naked eyes can be observed.

The carbon dust image that forms on the photosensitive drums is transferred on the paper of walking between photosensitive drums and the transfer roll slit by transfer roll, utilizes fixing roller that the carbon dust image on the paper is given permanent photographic fixing at last.

For the split type carbon dust tube that obtains because of the integrated level difference, it mainly utilizes the powder-storage bin of establishing in it to bear the storage of carbon dust and is transported to the task of developer roll, moreover utilizes waste powder hopper to hold the remaining carbon dust that is produced by photosensitive drums.The mode that this split type carbon dust tube and the image forming process unit at developing cell that comprises developer roll, powder feeding roller and photosensitive drums place generally take to separate accumulating, then fit assembling during installation.After carbon dust tube and developing cell, image forming process unit assembling finish, be exposed to the exposed drum face adjacency of the roll surface of the outer developer roll of developing chamber sidewall window with the photosensitive region of photosensitive drums on the image forming process unit, the carbon dust that developer roll carries is passed to photosensitive drums in this in abutting connection with the position, finishes the conversion of electrostatic latent image and carbon dust image.

Aforementioned carbon dust tube, its waste powder hopper are provided with the useless powder inlet that flows into for remaining carbon dust and control this inlet and open and close state of switch mechanism, and the remaining carbon dust that is produced by photosensitive drums must just can enter in the waste powder hopper through this inlet.For example CN200610107795.1 Chinese invention patent application discloses the developer box that a kind of maintenance supplies to the developer in the print process cartridge of image forming apparatus.This developer box comprises fresh developer chamber and waste developer chamber.The indoor maintenance new reagent of new reagent.Keep discarded developer unit in the waste developer chamber.Inlet is formed in the waste developer chamber.Discarded developer is received in the waste developer chamber by inlet.First opens and closes member opens and closes inlet.After developer box joined print process cartridge to, when control member navigated to primary importance, mechanism drove first and opens and closes member to open inlet.Before developer box separated from print process cartridge, when control member navigated to the second place, mechanism drove first and opens and closes member to close inlet.This carbon dust tube is after being loaded into image-forming assembly, the useless powder inlet of its carbon dust tube is inserted in the useless powder outlet of image-forming assembly, rotate the handle of carbon dust tube then, open carbon dust tube powder supply port and supply powder to developing cell, simultaneously by gear drive, guide member in the useless powder inlet of carbon dust tube is rotated simultaneously,, receive useless powder from the useless powder outlet of image-forming assembly to open the useless powder inlet of carbon dust tube.This carbon dust tube, construction of switch of the useless powder inlet of its control carbon dust tube is comparatively complicated, and the mutual cooperation precision requirement of switching mechanism is higher.

The utility model content

The utility model purpose is to provide a kind of carbon dust tube of laser printer, and this carbon dust tube can be realized automatic control to its useless powder inlet keying state by simple switching mechanism.

According to above-mentioned purpose, the carbon dust tube that is used for laser printer of the utility model design, comprise be used to store carbon dust and with its be supplied to developer roll powder-storage bin, be used to store up the waste powder hopper of the remaining carbon dust that produces by photosensitive drums.Waste powder hopper is provided with useless powder inlet and control should open and close state of switch by useless powder inlet.Useless powder inlet is the through hole on the tube wall of the little pipe of the recessed waste powder hopper that is provided with on the sidewall of the useless powder outlet butt joint with image-generating unit.Aforementioned switches comprises seal pad and coil spring.The tube wall through hole of little pipe is provided with along the both sides of roundlet pipe circumferencial direction and is parallel to each other and along the axially extended chute of roundlet pipe.Seal pad is arranged on the tube wall of little pipe and is supported in aforementioned chute slidably along roundlet pipe diametric(al).Seal pad is provided with stressed that inserts roundlet pipe inside behind the tube wall through hole that passes little pipe.One end of coil spring is buckled in little pipe on the axial end wall of waste powder hopper inner chamber, and its other end is buckled on the seal pad.The axially parallel of coil spring is axial in little pipe.

The utility model is used for the carbon dust tube of laser printer, utilizes the driving mechanism of coil spring as the useless powder inlet of sealing waste powder hopper.Before the carbon dust wound packages is gone into printer, be fixed in the useless powder inlet chute seal pad with between the useless powder inlet of waste powder hopper because of coil spring intrinsic pulling force or tension force effect, and keep the sealing contact condition, make the useless powder inlet of waste powder hopper be closed obstruct.At this state, because its useless powder inlet is closed, the inner space of waste powder hopper is isolated with external environment condition, the carbon dust flow phenomenon can not take place between waste powder hopper inner space and the external environment condition.Go at the carbon dust wound packages under the state of laser printer, the useless powder inlet of waste powder hopper is inserted in the useless powder outlet of the tubular that is provided with on the image-forming assembly of printer or the image-generating unit, conduction by stressed of seal pad, force coil spring to overcome its intrinsic pulling force or tension force, promote or draw seal pad to enter the mouth with the useless powder that sliding type leaves waste powder hopper, make the remaining carbon dust that produces by photosensitive drums flow in the waste powder hopper along useless powder inlet chute.At this state, because its useless powder inlet is opened wide, the inner space of waste powder hopper goes out interruption-forming carbon dust flow channel with the useless powder of image-forming assembly or image-generating unit, and then is collected remaining carbon dust.

The drawing explanation

Fig. 1 the utility model is used for the carbon dust tube skeleton view one of laser printer.

Fig. 2 the utility model is used for the carbon dust tube skeleton view two of laser printer.

Fig. 3 the utility model is used for the carbon dust tube fragmentary, perspective view one of laser printer.

Fig. 4 the utility model is used for the carbon dust tube fragmentary, perspective view two of laser printer.

Fig. 5 the utility model is used for the carbon dust tube fragmentary, perspective view three of laser printer.

Fig. 6 a the utility model is used for the local enlarged perspective one of carbon dust tube duty of laser printer.

Fig. 6 b the utility model is used for the local enlarged perspective two of carbon dust tube duty of laser printer.

Fig. 7 the utility model is used for the carbon dust tube partial sectional view of laser printer.

Fig. 8 the utility model is used for the useless powder entry switch mechanism of the carbon dust tube skeleton view of laser printer.

Fig. 9 a the utility model is used for the useless powder of carbon dust tube of laser printer and evacuates mechanism's skeleton view one.

Fig. 9 b the utility model is used for the useless powder of carbon dust tube of laser printer and evacuates mechanism's skeleton view two.

Figure 10 the utility model is used for the carbon dust tube waste powder hopper skeleton view of laser printer.

Figure 11 is the local enlarged perspective of Figure 10.

Embodiment

Describe the carbon dust tube course of work that the utility model is used for laser printer in detail below in conjunction with accompanying drawing.In institute's drawings attached, identical mark is used to refer to identical parts, feature or structure.Embodiment introduce in the process at concrete structure or parts only understand the reference illustration that the utility model is used for the carbon dust tube of laser printer as those skilled in the art, those skilled in the art can also make under the enlightenment of this technical scheme and not exceed the utility model and be used for the carbon dust tube technical scope of laser printer and the various equivalent technologies structures of essence.If it is unfavorable limiting the protection domain that carbon dust tube claim that the utility model is used for laser printer included with this exemplary illustration thus.The equivalent technologies structural scheme that is obtained under the enlightenment of technical solutions of the utility model still belongs to the protection domain that the utility model is used for the carbon dust tube claim of laser printer.

Referring to Fig. 1～11, the utility model is shown is used for the carbon dust tube of laser printer and the configuration state of relevant component parts thereof.

This carbon dust tube A is made up of following member: powder-storage bin 1, waste powder hopper 2, be used to control powder-storage bin 1 is presented carbon dust provider switch 3 from carbon dust to image-generating unit and puddle support 4.

Referring to Fig. 1,2,4, the plastics that powder-storage bin 1 adopts tygon and so on prepare with molding mode as starting material.Its profile is long box shape approximately.It is formed by several side walls enclose, only on the casing long side direction, form uncovered 113 (see figure 4)s, and with the end cap 102 of shape correspondence in the mode that plugs each other with uncovered 113 combinations, again through welding or bonding rear enclosed, to be formed for holding the cavity of carbon dust.Wherein, under the state of unshowned laser printer, the long side direction of long casing 103 is parallel to the developer roll central axis direction of laser printer in carbon dust tube A load map.Among Fig. 1,2, end cap 102 is buckled on the corresponding buckle 107 (shown in Fig. 1,2) that long casing 103 corresponding positions are provided with by several bayonet socket 106 (see figure 3)s on it, and after their butt joints, pass through welding or bonding way maintenance sealing between the two in the position that end cap 102 and long casing 103 are in contact with one another.The long bottom sidewall of this long casing 103 outwards expands and is semicylinder 101.The axial long side direction with long casing 103 of semicylinder 101 is consistent.At the position corresponding to semicylinder 101, the inner chamber of powder-storage bin 1 also is designed to the inner chamber that its xsect is the long casing form of semi-cylindrical form.On bottom sidewall, offer the window 104 (seeing shown in Figure 4) that extends axially certain-length along semicylinder 101 corresponding to powder-storage bin 1 half-cylindrical inner chamber.This window 104 be carbon dust tube A in docking scheme during unshowned printer image-generating unit, provide the carbon dust flow channel of carbon dust and so on developer to image-generating unit, also can be described as the meal outlet of carbon dust tube A.Window 104 axially has suitable length along semicylinder 101, usually this length and not shown laser printer developing roller length adaptation, therefore, window 104 just is provided with a reinforcement 105 that connects window 104 horizontal two walls along semicylinder 101 axially spaced-apart certain distances, to prevent window 104 deformation takes place.

Referring to Fig. 3,4, in the half-cylindrical inner chamber of powder-storage bin 1, being provided with powder-storage bin 1 half-cylindrical internal chamber wall surface keeps the carbon dust puddle support 4 of sliding contact state (among Fig. 3, in order more to clearly illustrate the configuration state of carbon dust puddle support 4, do not draw the long casing 103 and semicylinder 101 parts of powder-storage bin 1.The reader can in conjunction with other accompanying drawing for example Fig. 1,2 understand the corresponding construction feature).Carbon dust puddle support 4 has the blade 401 with the half-cylindrical cavity shape correspondence of powder-storage bin 1.Blade 401 is fixed in the rotating shaft 402, and can rotate with rotating shaft 402 under the driving of the moment of torsion that laser printer provides.Blade 401 has with the window 104 of aforementioned carbon dust flow channel as the carbon dust tube A length along semicylinder 101 axial length correspondences, and it keeps in touch between semicylinder 101 diametric external end edges schoolmates' 104 peripheral inwall.So, blade 401 just can stir the carbon dust that is arranged in powder-storage bin 1 half-cylindrical inner chamber in rotary course.Under the assembled state of carbon dust tube A, an end of rotating shaft 402 passes powder-storage bin 1 and is connected with the handle 403 with leverage after with the relative sidewall in end cap 102 positions.The other end of rotating shaft 402 slidably is resisted against end cap 102 on the surface of powder-storage bin 1 inner chamber, perhaps be supported on the support end 111 that end cap 102 is provided with on vertical wall of powder-storage bin 1 inner chamber (shown in Fig. 6 a, 6b), and and then cross end cap 102 and penetrate waste powder hopper 2 backs and dock coaxially with turning axle 204 described below in rotatable mode.Like this, when transmission gear 405 receives rotary torque that printers transmit when ordering about turning axle 204 rotations, carbon dust puddle support 4 drives blades 401 rotations, makes the carbon dust in powder-storage bin 1 inner chamber be in fluffy mobile state.

Referring to Fig. 1,2,4, utilize the On/Off state of the hermatic door 3 control windows 104 that are positioned at powder-storage bin 1 outside.Hermatic door 3 is provided with the connection 303 with window 104 correspondences.Hermatic door 3 is fixed on the handle 403 in the mode that is inserted in the docking groove 406 that is provided with on handle 403 cylinders by one end 301, its opposite end 302 is supported on the end wall of position with respect to handle 403 of powder-storage bin 1 slidably, exactly, be exactly on the end cap 102 of powder-storage bin 1.Hermatic door 3 with can be thorny the handle 403 axis mode of rotating, keep with being in the sliding contact state between the diapire outside surface around the window 104.Like this, when hermatic door 3 turned to first jiao of position with respect to the axis of handle 403, the connection 303 that is provided with on it was with window 104 alignment, and powder-storage bin 1 is communicated with extraneous by window 104, connected entrance 303.When hermatic door 3 turned to second jiao of position with respect to the axis of handle 403, connected entrance 303 staggered with window 104, and powder-storage bin 1 is communicated with extraneous toner passage and is closed.So, it serves as the rotation that axle is made certain angle with the half-cylindrical inner chamber of powder-storage bin 1 or the center line of handle 403 that the operator can control hermatic door 3 by handle 403, the connection 303 that makes hermatic door 3 overlaps or alignment with the window 104 of aforementioned carbon dust flow channel as carbon dust tube A some or all ofly, the connection 303 that perhaps makes hermatic door 3 is staggered fully with the window 104 of aforementioned carbon dust flow channel as carbon dust tube A, to open or to close the window 104 of aforementioned carbon dust flow channel as carbon dust tube A.Under the state that connected entrance 303 staggers fully with the window 104 as the carbon dust flow channel of carbon dust tube A, hermatic door 3 needs to form the sealing contact between the diapire outside surface around the schoolmate 104, can prevent that just carbon dust from leaking.In order to improve hermatic door 3 schoolmates 104 sealing characteristics between the diapire outside surface on every side, serve as a contrast between the diapire outside surface on every side with window 104 at hermatic door 3 usually and establish the elastomeric pad 112 of sponge and so on.This elastomeric pad 112 is adhered on the window 104 diapire outside surface on every side usually.Consideration for enhanced leaktightness door 3 self intensity, in the connected entrance 303 of hermatic door 3, along the central axis direction of handle 403, be provided with three and be used to separate connected entrance 303, and on the rotation round direction of handle 403, connect the connection strap 304 of mouthful 303 both lateral sides walls.

Referring to Fig. 3,5 (among the figure, in order more to clearly illustrate driving shaft 108 and, not draw the long casing 103 of powder-storage bin 1 or the relevant portion of influence observation sight line with the mated condition between the first half gears 109 and other member.The reader can wait in conjunction with other accompanying drawing such as Fig. 1 and understand the corresponding structure feature), in the long casing shape inner chamber of powder-storage bin 1, be provided with driving shaft 108 in addition.Driving shaft 108 extends along the casing long side direction of powder-storage bin 1, and the one end passes powder-storage bin 1 and is supported on after with the relative sidewall in end cap 102 positions on the first half gears 109.The first half gears 109 are with the second half gear 404 engagements that are arranged on the handle 403.The axis of the second half gears 404 overlaps with rotating shaft 402 axis of carbon dust puddle support 4.Like this, when the operator rotated by handle 403 control hermatic doors 3, the second half gears 404 just drove the first half gears 109 and rotate, and impel driving shaft 108 to rotate.

In end cap 102 outsides of powder-storage bin 1, be provided with the identical substantially end shield 201 (seeing Fig. 7,10) of the horizontal section configuration of powder-storage bin 1.The opening of end cap 102 be exactly end shield 201 by the shape correspondence with the mode combination that plugs each other, again through welding or bonding after sealed.Among Fig. 1, end shield 201 is buckled in form on buckle 110 (see figure 3)s of the respective numbers that end cap 102 corresponding positions are provided with by several bayonet socket 202 (see figure 10)s on it, by snapping or be adhered on the end cap 102, and keep between the two sealing by welding or bonding way in both docking sites of end shield 201 and end cap 102, so far, end shield 201 and end cap 102 common encirclements form waste powder hopper 2, referring to Fig. 1～2,5～7.

Referring to Fig. 5,6,7, after end shield 201 was buckled on the end cap 102, the position corresponding to rotating shaft 402 in waste powder hopper 2 was provided with turning axle 204.Turning axle 204 1 end bearings are on the support port 205 (seeing shown in Figure 5) that is provided with on vertical wall of powder-storage bin 1 inner chamber at end cap 102, the other end passes end shield 201 behind vertical wall 203 of powder-storage bin 1 inner chamber, be rotatably supported in end shield 201 on the sidewall 203 (seeing Fig. 1,7,10) of powder-storage bin 1, and the extending end of this termination passes end shield 201 and is provided with the complete transmission gear 405 coaxial with turning axle 204 behind the sidewall 203 of powder-storage bin 1 thereon regularly.The task of transmission gear 405 is to receive the rotary torque that laser printer transmits, to order about turning axle 204 rotations.

The other end of above-described driving shaft 108 is supported on end shield 201 on the sidewall 203 of powder-storage bin 1 after passing end cap 102 too.In the position of sidewall 203 supporting driving shafts 108, be provided with useless powder inlet 206.In the present embodiment, useless powder inlet 206 has following shape, and it is the through holes of offering on the cylindrical wall with the formed small column 207 of mode of recessed waste powder hopper 2 inner chambers on the sidewall 203 that circumferentially extend along small column 207.The other end of aforementioned driving shaft 108 is supported on the sidewall 203, the other end that specifically is meant driving shaft 108 is supported in jointing holes 208 (see figure 10)s that are provided with on the axial end wall of small column 207, and is fixed with guiding piece 209 (seeing shown in Fig. 1,3,5) on it extends end outside the jointing holes 208.Guiding piece 209 is shape cylindrical tube corresponding to cylindrical cavity within the small column 207.The tube wall of guiding piece 209 is provided with opening 210 (see figure 3)s.The outer cylindrical wall diameter of guiding piece 209 is slightly smaller than the cylindrical cavity of small column 207, and its inner cylindrical wall diameter is a bit larger tham the useless powder outlet of the tubular that is arranged on the image-generating unit, that is guiding piece 209 is plugged within the small column 207 in the pipe.So guiding piece 209 can be done the rotation of circumferencial direction in the cylindrical cavity within small column 207.In guiding piece 209 rotation processes, the useless powder inlet 206 with waste powder hopper 2 in whole rotational travel of the opening 210 on it keeps being communicated with.The task of guiding piece 209 is to drive not shown printer image-generating unit by rotating manner to open or close the useless powder that be arranged at image-generating unit on corresponding with useless powder transportation that produces when work with photosensitive drums and export, making the remaining carbon dust that results from the photosensitive drums be able to from then on useless powder outlet flows out or is intercepted, and then flow in the waste powder hoppers 2 via the useless powder inlet 206 of opening on the guiding piece 209 210 and waste powder hopper 2 successively, perhaps intercepted in the useless powder outlet of image-generating unit and can not be flowed out from the printer image-generating unit.

Like this, rotate by handle 403 control hermatic doors 3 the operator, and then the second half gear 404 drive in the first half gear 109 rotating process, driving shaft 108 rotates thereupon, finally order about the guiding piece 209 that is positioned at driving shaft 108 ends and also rotate synchronously, finally finish the task that the useless powder outlet of tubular of printer image-generating unit was opened or closed to aforementioned guiding piece 209.

See Fig. 3,5～7,9, in waste powder hopper 2,, and on the position corresponding to semicylinder 101 axis, be provided with first spiral pipe 211 and second spiral pipe 212 in the vertical of useless powder inlet 206 downwards.First spiral pipe 211 and second spiral pipe 212 axially all perpendicular to the natural subsidence direction of the useless powder that in useless powder inlet 206, relies on himself gravity fall, and be parallel to the axial of semicylinder 101.The axis of first spiral pipe 211 overlaps with the axis of second spiral pipe 212.The internal diameter of first spiral pipe 211 is greater than the external diameter of second spiral pipe 212, and first spiral pipe 211 is placed on second spiral pipe, 212 peripheries in other words.First spiral pipe 211 and the radial center of second spiral pipe, 212 axial mutually same ends are individually fixed in the radial center of turning axle 204.The spiral precession direction of first spiral pipe 211 and second spiral pipe 212 is pointed to the direction away from useless powder inlet 206 simultaneously.In the present embodiment, the spiral precession direction of first spiral pipe 211 and second spiral pipe 212 is pointed to powder-storage bin 1 by waste powder hopper 2 simultaneously.Along the diametric(al) of first spiral pipe 211, the external margin of first spiral pipe 211, promptly its periphery corresponding partly with waste powder hopper 2 along vertical to diapire keep in touch.So, transmission gear 405 receive rotary torque that printers transmit with the process of ordering about turning axle 204 rotations in, rotation in the same way takes place with the rotation of turning axle 204 in first spiral pipe 211 and second spiral pipe 212 simultaneously, and then the useless powder that hangs is pushed to the side that waste powder hopper 2 closes on powder-storage bin 1 place from useless powder inlet 206 in the screw propulsion mode, be in the state that does not have useless powder accumulation or few useless powder accumulation is only arranged all the time to keep waste powder hopper 2 to be positioned at the enter the mouth zone of 206 belows of useless powder.Usually, along the sedimentation direction of useless powder in the useless powder inlet 206, promptly the vertical of waste powder hopper 2 to, the integral position of first spiral pipe 211 between useless powder inlet 206 and waste powder hopper 2 along vertical to diapire between; Certainly, the ring that first spiral pipe 211 is adjusted in the position of useless powder inlet 206 also can push away its natural build-up areas to useless powder well with beyond interior and second spiral pipe, 212 rings.

Referring to Fig. 8,10,11,,, be provided with and be parallel to each other and along small column 207 axially extended chutes 213 at the dual-side of small column 207 corresponding to useless powder inlet 206 along the circumferencial direction of small column 207.The side of two correspondences of seal pad 214 is supported in the chute 213 slidably.And along the diametric(al) of small column 207, seal pad 214 is positioned on the outer tube wall of small column 207.Seal pad 214 has with small column 207 corresponding shape, that is its xsect approximately is the circular arc (see figure 8).Be covered on the outer tube wall of small column 207 and when chute 213 slides at it like this, can form with useless powder inlet 206 and overlap or the dislocation relation, that is form when overlapping the useless powder inlet 206 of sealing with useless powder inlet 206 and (see Fig. 6 a), open useless powder inlet 206 (seeing Fig. 6 b) when forming dislocation with useless powder inlet 206.Among Fig. 8, the inner cylinder face of seal pad 214 is provided with stressed 215.Stressed 215 diametric(al) along seal pad 215 extended towards its cylindrical center.In the present embodiment, stressed 215 be positioned at seal pad 214 cylindrical axes to an end.Under confined state, stressed 215 protrudes out in the interior tube chamber of small column 207 after passing useless powder inlet 206.Seal pad 214 cylindrical axes to another end, be one sidewall 216 that extends towards seal pad 214 cylindrical center.Under confined state, an end of a coil spring 217 is buckled on this sidewall 216, and its other end is buckled in small column 207 on the axial end wall 218 of waste powder hopper 2 inner chambers (referring to Fig. 7,11).Coil spring 217 snaps onto state between sidewall 216 and the axial end wall 218 by its two ends under, to keep usually its axially parallel in small column 207 axially.

In conjunction with Fig. 5,6,7, under carbon dust tube A packs the state of state laser printer into, the useless powder outlet of the tubular of image-generating unit is through in the cylindrical cavity within the small column 207 of guiding piece 209 insertion waste powder hoppers 2, stressed 215 contention effect of pushing that is subjected to by the useless powder outlet of image-generating unit tubular generation of seal pad 214, apply the pressure that points to waste powder hopper 2 inner chambers to seal pad 214, make its intrinsic pulling force that overcomes coil spring 217, promote seal pad 214 is opened waste powder hopper 2 with sliding type useless powder inlet 206 (referring to Fig. 6 b).In opposite situation, the useless powder outlet of image-generating unit is withdrawed from from the useless powder inlet 206 of waste powder hopper 2, the pushing effect that originally was subjected to for stressed 215 disappears, and useless powder inlet 206 formation that coil spring 217 restorable intrinsic pulling force traction seal pads 214 slide into waste powder hopper 2 overlap, and it is closed.

Claims (1)

1. the carbon dust tube that is used for laser printer, comprise and be used to store carbon dust and it is supplied to the powder-storage bin of developer roll, be used to store up the waste powder hopper of the remaining carbon dust that produces by photosensitive drums, described waste powder hopper is provided with useless powder inlet and control should open and close state of switch by useless powder inlet, described useless powder inlet is the through hole on the tube wall of the little pipe of the recessed described waste powder hopper that is provided with on the sidewall of the useless powder outlet butt joint with image-generating unit, it is characterized by described switch and comprise seal pad and coil spring, described tube wall through hole is provided with along the both sides of described roundlet pipe circumferencial direction and is parallel to each other and along the axially extended chute of described roundlet pipe, described seal pad is arranged on the tube wall of described little pipe and is supported in described chute slidably along described roundlet pipe diametric(al), described seal pad is provided with and passes stressed that inserts behind the described tube wall through hole in the described little pipe, described coil spring one end is buckled in described little pipe on the axial end wall of described waste powder hopper inner chamber, the other end is buckled on the described seal pad, and the axially parallel of described coil spring is axial in described little pipe.

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