Patent Grant
8280296
This application is based on and claims priority under 35 U.S.C. 119 from Japanese Patent Application No. 2008-166532 filed Jun. 25, 2008.
This invention relates to a powder transporting apparatus and an image forming apparatus. The powder transporting apparatus and the image forming apparatus are applied to transportation of a powder, especially, a developer. Chemicals, resin powder, pigment and abrasive compound are used as the powder. It is preferred that Average particle size is from 1 μm to 500 μm.
According to an aspect of the present invention, a powder transporting device includes: a dropping path through which powder drops; a loosening member that is arranged in the dropping path, and loosens the powder applied on an inner wall of the dropping path; a supporting portion that is provided on the inner wall of the dropping path, and supports the loosening member; a rotary member that includes; a rotary center; and a reciprocation applying portion that is located at a position eccentric from the rotary center, the rotary member being arranged within the dropping path and rotationally driven; and a reciprocation applied portion that is provided on the loosening member, and is brought into contact with the reciprocation applying member, wherein the loosening member is moved along the inner wall of the dropping path by contact between the reciprocation applying member and the reciprocation applied portion while the rotary member rotates.
Exemplary embodiment of the present invention will be described in detail based on the following figures, wherein:
Now referring to the drawings, an explanation will be given of examples of the mode for carrying out the invention (hereinafter referred to as embodiments), but this invention should not be limited to the following embodiments.
For facilitating the understanding of the following explanation, it is assumed in the drawings that the fore-and-after direction is an X-axis direction, the left-and-right direction is a Y-axis direction and the up-and-down direction is a Z-axis direction, and also assumed that the directions or sides denoted by arrows X, −X, Y, −Y, Z and −Z are forward, rearward, rightward, leftward, upward and downward, or front side, rear side, right side, left side, upper side and lower side, respectively.
Further, in the drawings, the symbol containing “•” in “ο” unit the arrow going from rear to front of the paper face, and the symbol containing “×” in “ο” unit the arrow going from front to rear of the paper face.
In the following explanation referring to the drawings, for easiness of understanding, the members other than those necessary for explanation will not be appropriately illustrated.
In
(Operating Unit)
The operating unit UI has an inputting button UIa used to start copying or set the number of sheets to be copied. The operating unit UI has also a display UIb on which the contents inputted by the inputting button UIa and status of the copier U are displayed.
(Image Inputting Device)
The image inputting device U1 includes an automatic document feed device, an image reading device, etc. Light is put onto an arranged paper, the reflected light is received by a solid-state image pickup device, and the light received is converted into image information of red R, green G and blue B which are supplied to the image forming apparatus body U3 at predetermined times or “timings”.
(Medium Supplying Device)
The medium supplying device U2 includes a plurality of sheet feeding trays TR1, TR2, TR3 and TR4 which are one example of a medium housing vessel. The medium supplying device U2 has also a medium supplying path SH1 for transporting the recording sheet S, an example of the medium for image recording taken from each of the sheet feeding trays TR1 to TR4 to the image forming apparatus U3.
(Image Forming Apparatus Body)
In
Further, the image forming apparatus body U3 includes a control unit C, a laser driving circuit D which is an example of a latent image forming apparatus driving circuit controlled by the control unit C and a power supply circuit E. The laser driving circuit D converts the image information of red R, green G and blue B inputted from the image inputting device U1 into the image information of Y (yellow), M (magenta), C (cyan) and K (black) and outputs, at predetermined timings, the corresponding driving signals to latent image forming devices ROSy, ROSm, ROSc and ROSk for individual colors.
Beneath the latent image forming devices ROSy, ROSm, ROSc and ROSk for individual colors, a drawer U3b for a visible image forming device which is an example of a drawing member is movably supported between a drawing position at the front of the image forming apparatus body U3 and a mounting position within the image forming apparatus body U3 by slide rails R1 and R1 which are an example of a pair of left and right guiding members.
In
Further, as regards the other colors Y, M, C also, a photosensitive body unit UY, UM, UC includes a photosensitive drum Py, Pm, Pc, a charging roll CRy, CRm, CRc which is an example of the charger, and a cleaner CLy, CLm, CLc.
The photosensitive body unit UK for the K color and developing device Gk having a developing roll ROk constitute a visible image forming device UK+Gk for the K color. Likewise, the photosensitive body unit UY, UM, UC for Y, M, C and the developing device Gy, Gm, Gc having a developing roll ROy, ROm, ROc constitute a visible image forming device UY+Gy, UM+Gm, UC+Gc for Y, M, C, respectively.
The drawer U3b for the visible image forming device includes a drawer body U3b1 which is an example of a holder in which the photosensitive body units UY, UM, UC, UK and developing devices Gy, Gm, Gc, Gk are detachably mounted.
In
In the developing device Gy to Gk, the developer consumed by development is added from a toner cartridge Ky, Km, Kc, Kk which is an example of the developer housing vessel detachably mounted in the developer adding device U3a. In Embodiment 1, a two-component developer containing a toner and a carrier is employed as the developer. From the toner cartridge Ky, Km, Kc, Kk, a “high density developer” having a higher density than that in the developing device Gy, Gm, Gc, Gk is added. Therefore, in the developing device Gy, Gm, Gc, Gk in Embodiment 1, carrier exchange is done by little by little exhausting the developer containing the deteriorated carrier from the developing device Gy, Gm, Gc, Gk while adding the high density developer containing a small quantity of carrier. Such a technique for exchanging the carrier little by little is conventionally known, and described in e.g. JP-A-2000-81787 and JP-A-2003-84570, and so its detailed explanation will not be given.
In the developing device Gy, Gm, Gc, Gk, the developer containing the deteriorated carrier is exhausted from a deteriorated developer exhaust opening G1y, G1m, G2c, G1k to the rear end of the developing device Gy, Gm, Gc, Gk and the developer containing a new carrier is added from the toner cartridge Ky, Km, Kc, Kk. In this way, the developer within the developing device Gy, Gm, Gc, Gk is exchanged for the new carrier. The developer exhausted from the deteriorated developer exhaust opening G2y, G2m, G2c, G2k flows into a deteriorated developer transporting path G1y, G1m, G1y, G1k extending backward and is transported backward by a deteriorated developer transporting member G3y, G3m, G3c, G3k arranged in the deteriorated developer transporting path G2y, G2m, G2c, G2k.
The toner images on the photosensitive body Py, Pm, Pc, Pk surfaces are superposedly transferred onto an intermediate transfer belt B by primary transfer rolls T1y, T1m, T1c, T1k which are an example of a primary transfer device. The intermediate transfer belt B is an example of an intermediate transfer body which is an example of the developer holder and on which the toner images of the photosensitive drums Pk to Pc are intermediately transferred. Thus, a multiple color image is formed on the intermediate transfer belt B. The color toner image which is an example of the multiple color visible image formed on the intermediate transfer belt B is transported to a secondary transfer region Q4.
Where there is only the image information of the K color, only the photosensitive drum Pk of K color and developing device Gk are employed so that the toner image of the K color will be formed.
After the primary transfer, the residue such as the remaining developer and paper powder applied on the photosensitive drum Py, Pm, Pc, Pk surface is removed by the cleaner CLy, CLm, CLc, CLk.
Beneath drawer U3b for the visible image forming device, a drawer U3c for the intermediate transfer device, which is an example of the drawing member is movably supported between a drawing position at the front of the image forming apparatus body U3 and a mounting position within the image forming apparatus body U3. A belt module BM which is an example of the intermediate transfer device is supported by the drawer U3c for the intermediate transfer device between the ascending position in contact with the lower surface of the photosensitive drum Py, Pm, Pc, Pk and the descending position away downward from the lower surface.
The belt module BM includes the intermediate transfer belt B; a belt supporting roll Rd+Rt+Rw+Rf+T2a as an example of an intermediate transfer member supporting member (which consists of an driving roll Rd which is an example of an intermediate transfer body driving member, a tension roll Rt which is an example of a tens ion generating member, a walking roll Rw which is an example of a meandering preventing member, a plurality of idler rollers Rf which are an example of a driven member and a backup roller T2a which is an example of a secondary transfer opposite member); and the primary transfer rolls T1y, T1m, T1c, T1k. The intermediate transfer belt B is supported by the belt supporting roll Rd+Rt+Rw+Rf+T2a so that it is rotatable in an arrow Ya direction.
Beneath the backup roll T2a, a secondary transfer unit Ut is arranged. A secondary transfer roll T2b which is an example of a secondary transfer member of the secondary transfer unit Ut is arranged so that it can be separated from or brought in contact with the backup roll T2a across the intermediate transfer belt B. The region where the secondary transfer roll T2b is in pressure-contact with the intermediate transfer belt B constitutes the secondary transfer region Q4. A contact roll T2c which is an example of a contact power supplying member is in pressure-contact with the backup roll T2a. The contact roll T2c is supplied with a secondary transfer voltage with the same polarity as the charging polarity of the toner at predetermined timings from a power supply circuit E controlled by the control unit C.
The backup roll T2a, secondary transfer roll T2b and contact roll T2c constitute the secondary transfer device T2.
Beneath the belt module BM, a sheet transporting path SH2 is arranged. The recording sheet S fed from the medium supplying path SH1 of the medium supplying device U2 is transported to a register roll Rr which is an example of a transporting timing adjusting member of the sheet transporting path SH2 by a medium transporting roll Ra which is an example of a recording medium transporting member. The register roll Rr downstream transports the recording sheet S at the timing when the color toner image formed on the intermediate transfer belt B is transported to the secondary transfer region Q4. Thus, the recording sheet S is transported to the secondary transfer region Q4 by guidance of a register-side sheet guide SGr and a pre-transfer sheet guide SG1.
The register-side sheet guide SGr as well as the register roll Rr is secured to the image forming apparatus body U3.
The color toner image on the intermediate transfer belt B is transferred onto the recording sheet S by the secondary transfer device T2 when it passes the secondary transfer region Q4. In the case of the multiple color image, the toner images primary-transferred on the intermediate transfer belt B surface are collectively secondary-transferred onto the recording sheet S.
The primary transfer rolls T1y to T1k, secondary transfer device T2 and intermediate transfer belt B constitute the transfer devices T1y to T1k plus the secondary transfer device T2+B according to Embodiment 1.
The intermediate transfer belt B after the secondary transfer is cleaned by a belt cleaner CLB provided on the right lower side of the intermediate transfer belt B, which is an example of a developer holder cleaner and an example of an intermediate transfer body cleaner. By the belt cleaner CLB, the residue such as the developer on the intermediate transfer belt B left without being employed at the time of the secondary transfer and paper powder are removed from the intermediate transfer belt B. In
The recording sheet S with the toner image secondary-transferred is transported through a post-transfer sheet guide SG2 and a medium transporting belt BH which is an example of a transporting member to a fixing region Q5 where a fixing roll Fh of a fixing device F and a pressurizing roll Fp which is an example of a pressurizing/fixing member are brought into pressure-contact with each other. The toner image on the recording sheets is heated and fixed by the fixing device F when it passes the fixing region Q5. Downstream of the fixing device F, provided is a changing gate GT1 which is an example of a changing member. According to an instruction from a user, the changing gate GT1 selectively changes the recording sheet S transported along the sheet transporting path SH2 and subjected to the heating/fixing in the fixing region Q5 into the side of a sheet ejecting path SH3 or a sheet inverting path SH4 of the sheet processing device U4. The sheet S transported into the sheet ejecting path SH3 is transported to a sheet transporting path SH5 of the sheet processing device U4 and the curl or a warp of the sheet S is corrected by a curl correcting member U4a which is an example of a medium warp correcting member arranged on the sheet transporting path SH5. Thereafter, the sheet S with the image fixed plane oriented upward is ejected from an ejecting roll Rh which is an example of a medium ejecting member into an ejecting tray TH1 which is an example of a medium ejecting portion of the sheet processing device U4.
The sheet S transported onto the sheet inverting path SH4 of the image forming apparatus body U3 by the changing gate GT1 is transported to the sheet inverting path SH4 of the image forming apparatus body U3 through a Mylar gate GT2 which is an example of a flexible changing member.
At this time, where the recording sheet S with its image fixed plane oriented downward is ejected, immediately after the rear end of the recording sheet S passes the Mylar gate GT2, the recording sheet S is inverted. In this case, the Mylar gate GT2 once passes the recording sheets transported to the sheet inverting path SH4, transports it toward the sheet transporting paths SH3 and SH5. Thus, the recording sheet S with the image fixed plane oriented downward is ejected into the ejecting tray TH1.
To the way of the sheet inverting path SH4 of the image forming apparatus body U3, a sheet circulating path SH6 is connected. To its connecting point, a Mylar gate GT3 is connected. The downstream end of the sheet inverting path SH4 of the image forming apparatus body U3 is connected to a sheet inverting path SH7 of the sheet processing device U4.
The recording sheet S transported to the sheet transporting path SH4 through the changing gate GT1 is transported toward the sheet inverting path SH7 of the sheet processing device U4 by the Mylar gate GT3. In this case, the Mylar gate GT3 once passes the recording sheet S transported to the sheet inverting path SH4, as it is, and after the recording sheet S passed is inverted, transports it toward the sheet transporting path SH6.
Thus, the recording sheet S transported to the sheet circulating path SH6 is transported again to the transfer region Q4 through the medium supplying path SH1 and subjected to double-sided printing. The resultant sheet is transported into the sheet processing device U4 and ejected into the ejecting tray TH1.
The components denoted by symbols SH1 to SH7 constitute a sheet transporting path SH. The components denoted by symbols SH, Ra, Rr, Rh, SGr, SG1, SG2, BH and GT1 to GT3 constitute a sheet transporting device SU.
(Waste Powder Transporting Device)
At the rear of the image forming apparatus body U3, supported is a waste powder transporting device UH which is an example of a powder transporting device.
The waste powder transporting device UH includes five developer dropping units UH11, UH12, UH13, UH14 and UH16 which extend in the up-and-down direction. The developer dropping unit UH11 arranged on the most left side, i.e. most Y-side (most right side in the illustration of
The developer dropping unit UH12 located on the right side of the developer dropping unit UH11 is connected to the residue transporting path CLc1 extending from the cleaner CLc of the C color and the deteriorated developer transporting path G2k extending from the developing device Gk of the K color.
The developer dropping unit UH13 located on the right side of the developer dropping unit UH12 is connected to the residue transporting path CLm1 extending from the cleaner CLm of the M color and the deteriorated developer transporting path G2c extending from the developing device Gc of the C color.
The developer dropping unit UH14 located on the right side of the developer dropping unit UH13 is connected to the residue transporting path CLy1 extending from the cleaner CLy of the Y color and the deteriorated developer transporting path G2m extending from the developing device Gm of the M color. The developer dropping unit UH16 located on the right side of the developer dropping unit UH14 is connected to the residue transporting path CLB1 extending from the belt cleaner CLB and the deteriorated developer transporting path G2y extending from the developing device Gy of the Y color.
The lower ends of the developer dropping units UH11 to UH16 are connected to one another by a merging transporting path UH2 which extends horizontally. The merging transporting path UH2 in Embodiment 1 is connected to pass through the lower ends of the developer dropping units UH11 to UH16 in the left-and-right direction, and accommodates a merging transporting auger UH2c extending in the left-and-right direction which is an example of a transporting member. To the left end of the merging transporting auger UH2c, drive is transmitted from a merging transporting motor UH2d which is an example of a driving source so that the waste developer within the merging transporting path UH2 is transported from left to right.
The right end of the merging transporting path UH2 is connected to the upper end of a dropping direction transporting path UH3 extending in the up-and-down direction so that the waste developer transported to the right end of the merging transporting path UH2 flows into the dropping direction transporting path UH3 and is dropped and transported. The dropping direction path UH3 in Embodiment 1 accommodates a bridging preventing member UH3c which extends in the up-and-down direction and is reciprocated in the up-and-down direction to demolish the waste developer applied on the inner wall of the dropping direction transporting path UH3. The bridging preventing member UH3c in Embodiment 1 is formed of a “coil spring” which is a wire wound helically. At the right side of the upper part of the dropping direction transporting path UH3, a bridging preventing motor unit UK3d is supported which reciprocates the bridging preventing member UH3c in the up-and-down direction. The bridging preventing member UH3c and bridging preventing motor unit UH3d are described in e.g. JP-A-2005-091848 and so their detailed explanation will not be made.
A vessel transporting path UH4 extending in the left-and-right direction is connected to the lower end of the dropping direction transporting path UH3. The waste developer dropped through the dropping direction transporting path UH3 flows into the vessel transporting path UH4. The vessel transporting path UH4 accommodates a vessel transporting auger UH4c extending in the left-and-right direction. At the right end of the vessel transporting path UH4, a left-and-right direction transporting motor UH4d is supported. Drive is transmitted to the vessel transporting auger UH4c from the left-and-right direction motor UH4d so that the waste developer within the vessel transporting path UH4 is transported from left to right.
At the right end of the vessel transporting path UH4, a developer recovery vessel UH6 extending in the up-and-down direction is connected. The developer transported through the vessel transporting path UH4 flows into the developer recovery vessel UH6 so that it is recovered.
(Developer Dropping Unit)
The developer dropping units UH11 to UH16 will be explained below in detail, but they are constructed similarly except that the residue transporting path and deteriorated developer transporting path connected to the developer dropping units UH12 to UH14 are different. For this reason, the explanation will be given of only the developer dropping unit UH12 connected to the residue transporting path CLc1 extending from the cleaner CLc of the C color and the deteriorated developer transporting path G2k extending from the developing device Gk of the K color. The other developer dropping units UH13 and UH14 will not be explained. The developer dropping unit UH11 and the developer dropping unit UH16 are constructed similarly to the developer dropping units UH12 to UH14 except that a single transporting path but not two transporting paths is connected, and so their detailed explanation will not be made.
In
In
The developer dropping frame 1 has a right side wall 11 arranged on the right side of the front wall 2 and extending in the up-and-down direction.
The right side wall 11 has a right upper wall 12 extending in the up-and-down direction and a right lower wall 13 formed integrally below the right upper wall 12.
The front edges of the right upper wall 12 and right lower wall 13 are formed along the front inclining wall 7 of the front wall 2.
The rear edge of the right upper wall 12 is formed along the up-and-down direction. At the upper end of the edge of the right upper wall 12, an upper unit securing portion 12a is formed. The upper unit securing portion 12a has an upper unit securing screw hole 12c which is an example of a screw hole for the securing portion for securing an upper developer dropping frame. At the lower end of the rear edge of the right upper wall 12, a right step 12b extending rearward is formed.
The rear edge of the right upper wall 13 extends downward from the rear end of the right step 12b.
The developer dropping frame 1 has a left side wall 14 arranged on the left side of the front wall 2 and extending in the up-and-down direction.
At the upper end of the left side wall 14, an left upper end vertical wall 16 extending vertically is formed. At the lower end of the left upper end vertical wall 16, continuously formed is a left upper inclining wall 17 which inclines rightward gradually downward. At the lower end of the left upper inclining wall 17, a left upper vertical wall 18 extending vertically is formed. Below the left upper vertical wall 18, a left lower wall 19 is integrally formed thereto. Further, the left upper end vertical wall 16, left upper inclining wall 17 and left upper vertical wall 18 constitute the left upper wall 14a.
The front edges of the left upper vertical wall 18 and left lower wall 19 are formed along the front inclining wall 7 of the front wall 2.
The rear edge of the left upper vertical wall 18 is formed along the up-and-down direction. At the lower end of the rear edge of the left upper vertical wall 18, a left step 18a extending rearward is formed.
The rear edge of the left lower wall 19 extends downward from the rear edge of the left step 18a.
The rear edge of the right lower wall 13 and the rear edge of the left lower wall 19 are connected to each other by a rear wall 21 extending in the up-and-down direction.
At upper end of the rear wall 21, formed is a lower unit securing portion 22 projecting rearward from the rear wall 21. The lower unit securing portion 22 has a lower unit securing portion-use screw hole 22c which is an example of a screw hole for the securing portion for securing a lower developer dropping frame.
At the lower end of the rear wall 21, formed is a merging transporting path-use removable cover securing portion 23 which is an example of a covering member securing portion. At the upper end of the merging transporting path-use removable cover securing portion 23 for a cover upper end screw hole 23a is formed.
In
The space encircled by the front wall 2, right side wall 11, left side wall 14, rear wall 21 and top wall 24 constitutes a developer dropping path 26 which is an example of a dropping path.
At the upper rear of the developer dropping frame 1, a unit attaching opening 27 is formed by the rear edge of the right upper wall 12, upper edge of the right step 12b, upper edge of the rear wall 21, upper edge of the left step 18a, rear edge of the left upper wall 14a and rear edge of the top wall 24. The unit attaching opening 27 externally opens the upper rear of the developer dropping path 26.
At the rear lower end of the developer dropping frame 1, a cover attaching opening 28 is formed which is an example of a covering member attaching portion. The cover attaching opening 28 externally opens the lower end of the developer dropping path 26.
In
At the rear end of the residue transporting cylinder CLc3, a residue dropping opening 29 is formed which is an example of a flow-in opening. In Embodiment 1, the residue dropping opening 29 is located behind the front bearing 7a formed in the front inclining wall 7. A bearing member 31 is supported at the rear end of the residue transporting cylinder CLc3. The rear end of the auger CLc2 is rotatably supported by the bearing member 31.
The rear end of the auger CLc2 passes rearward from the rear end of the residue transporting cylinder CLc3. At the rear end of the auger CLc2, a driven coupling 32 is supported which is an example of a well known driven transmitting member.
Further, on the outer side of the rear end of the residue transporting cylinder CLc3, supported are a dropping opening cover 33 which is an example of a dropping opening opening/closing member movable in the fore-and-aft direction and a cover closing spring 34 which is an example of an elastic member which pushes the dropping opening cover 33 rearward.
Therefore, where the cleaner CLc is mounted in the image forming apparatus body U3, the dropping cover opening 33 is limited by the frame through-hole U3f of the body frame U3d so that it moves forward relatively to the residue dropping opening 29. At this time, the cover closing spring 34 is deformed elastically to shrink so that the residue dropping opening 29 is opened. When the cleaner CLc is removed from the image forming apparatus body U3, the cover closing spring 34 is elastically restored so that the dropping cover 33 moves relatively rearward to close the residue dropping opening 29.
In
As a unit for transporting the developer within the developer transporting path, the developer transporting member to which drive is transmitted from the driving motor is employed. This is described in e.g. JP-A-2005-181515 and so will not be explained in detail.
At the unit attaching opening 27 of the developer dropping frame 1, detachably supported is a driving unit 37 which is an example of a loosening member driving unit.
The driving unit 37 includes a gear unit 37a which is an example of a drive transmitting unit arranged on the front side and a motor unit 61 described later arranged on the rear side of the gear unit 37a. The gear unit 37a has a gear frame 38 which is an example of a driving unit frame. The gear frame 38 includes a plate-like front side wall 39 located on the front side, a right side wall 41 extending rearward from the right side of the front side wall 39, a left side wall 42 extending rearward from the exit side, an upper side wall 43 extending rearward from the upper end and an lower side wall 44 extending rearward from the lower end.
In
On the right side of the front end of the upper wall 43, formed is a developer dropping frame 1-use secured portion 43a which projects upward oppositely to the upper unit secured portion 12a. At the developer dropping frame 1-use secured portion 43a, formed is an upper unit secured portion-use through-hole 43b which is an example of an upper developer dropping frame secured portion-use through-hole. On the left side of the rear end of the upper wall 43, formed is a motor unit secured portion 43c which is an example of a driving unit-use secured portion which projects upward. At the motor unit secured portion 43c, a screw hole 43d is formed.
On the lower face of the lower side wall 44, formed is a right lower guide 44a extending rearward from the lower end of the right guide 39a. On the lower face of the lower side wall 44, formed is a left lower guide 44b extending rearward from the lower end of the left guide 39b. At the rear end of the lower side wall 44, formed is a lower unit secured portion 44c projecting downward oppositely to the lower unit secured portion 22. On the other hand, at the lower unit secured portion 44c, formed is a lower unit secured portion-use through-hole 44d which is an example of a lower developer dropping frame secured portion-use through-hole. The couple of right and left lower guides 44a, 44b are formed so as to be in contact with the inner face of both right and left steps 12b, 18a formed by the right step 12b and the left step 18a in the developer dropping frame 1. Their length in the fore-and-after direction is made shorter than that of the right and left steps.
In the crank use through-hole 48, supported is a crank 51 which is an example of a rotating member, extending in the fore-and-aft direction through the bearing member 47. The crank 51 has a crank shaft 52 which is an example of a rotary center extending in the fore-and-aft direction. At the front end of the crank shaft 52, integrally formed is a first extension 53 having a shape bending outwardly in the radial direction. At the outer end in the radial direction of the first extension 53, integrally formed is a coil supporting portion 54 extending forward, which is an example of a loosening member supporting portion and also an example of a reciprocation applying portion. Namely, the coil supporting portion 54 is located at the position eccentric from the crank shaft 52 serving as the rotary center. At the front end of the coil supporting portion 54, integrally formed is a second extension 56 extending inwardly in the radial direction. At the inner end in the radial direction of the second extension 56, integrally formed is a front supported projection 57 coaxial to the crank shaft 52 which is an example of a supported portion extending forward.
Where the driving unit 37 is mounted in the developer dropping frame 1, the front supported projection 57 is fit in the front bearing 7a from behind and rotatably supported.
At the rear end of the crank shaft 52, secured is a crank gear 58 which is an example of a driven gear. The crank shaft 52 has a stopper 52a formed close to the front side of the crank use through-hole 48.
At the rear of the gear frame 38, supported is a motor unit 61 which is an example of an driving source unit. The motor unit 61 has a motor 62 which is an example of a driving source. At the front of the motor 62, supported is a plate-like motor unit frame 63 which is an example of a driving source unit frame. At the left upper end of the motor unit frame 63, formed is a motor unit securing portion 63a which is an example of a unit securing portion, opposite to the motor unit secured portion 43c. At the motor securing portion 63a, formed is a screw through-hole 63b corresponding to the screw hole 43d. Further, on the right side of the central portion in the up-and-down direction of the motor unit frame 63, formed is a central portion screw through-hole 63c corresponding to the central securing screw hole 41b.
In
The driving gear 64 has a gear segment 66 arranged at the rear end, which is a cylindrical member having the motor shaft 62a as a central shaft and gear teeth formed on the outer periphery. At the front of the gear segment 66, integrally formed is a cylindrical spring seat 67 having a larger diameter than that of the gear segment 66. Within the spring seat 67, formed is a spring rear receiver 67a formed of a circular dent. At the inner end of the spring rear receiver 67a, integrally formed is a collar 68 which is an example of a cylindrical spring through-hole, extending forward along the motor shaft 62a.
At the front end of the collar 68, movably in the fore-and-aft direction supported is a driving side coupling 71 which is an example of a drive transmitting member. The driving side coupling 71 has a coupling body 72 arranged oppositely to the driven coupling 32. Within the coupling body 72, formed is a mesh 72a formed of a dent in mesh with the lug of the driven coupling 32. On the rear face of the coupling body 72, formed is a front spring supporting portion face 72b. On the front spring supporting portion face 72b, integrally formed is a front spring supporting portion 72c which is an example of a cylindrical front spring through-hole extending rearward. Between the front spring supporting portion face 72b and the spring rear end receiver 67a, mounted is a spring 73 which is an example of an urging member forward urging the driving side coupling 71 so as to cover the collar 68 and front spring supporting portion face 72b. The driving side coupling 71 is prevented from coming off by a stopper 74 supported at the front end of the motor shaft 62a. Therefore, by unit of urging by the spring 73, the driven coupling 32 and driving side coupling 71 surely mesh with each other. Thus, the motor shaft 62a and auger CLc2 are coupled with each other so that the rotation of the motor shaft 62a is transmitted to the auger CLc2.
Beneath the gear segment 66 of the driving gear 64, rotatably supported is an intermediate gear 76 which is an example of an intermediate gear. The intermediate gear 76 is in mesh with the gear segment 66 and crank gear 58. Therefore, when the motor 62 rotates, the crank gear 58 rotates through the driving gear 64 and intermediate gear 76 so that the rotation is transmitted to the crank 51.
At the merging transporting path-use detachable cover securing portion 23 at the lower end of the developer dropping unit 1, supported is a merging transporting path use detachable cover 83 which is an example of a merging transporting path-use detachable member. The merging transporting path use detachable cover 83 has a detachable cover body 84 extending in the up-and-down direction. At the upper end of the detachable cover body 84, formed is a cover upper through-hole 84d which is an example of an upper covering member securing through-hole, corresponding to the cover-use upper end screw hole 23a. At the lower part of the detachable cover body 84, formed is a transporting path supporting portion 84a formed along the rear outer periphery of the merging transporting path UH2. At the lower end of the detachable cover body 84, formed is a cover lower end through-hole 84f which is an example of a lower covering member securing through-hole, corresponding to the lower cover securing screw 8a. Therefore, with the merging transporting path UH2 supported by the front merging transporting path receiving portion 8, by securing the detachable cover body 84 by the cover upper through-hole 84d and cover lower through-hole 84f, the merging transporting path UH2 and the developer dropping unit 1 are mounted.
At the front supported projection 57 of the crank 51, supported is a swinging member 77 which is an example of an loosening member. The swinging member 77 has a swinging board 78 which is an example of a loosening member body, extending along the front inclining wall inner face 7b which is an example of an inner face of the front inclining wall 7.
The lower part of the swinging board 78 has a width narrowing downward in the right-and-left direction.
The position of the upper end of the swinging board 78 is located at an upper position in the up-and-down direction than the position where the region resulting when the residue dropping opening 29 is projected downward in a direction of gravity crosses the front inclining wall 7. Namely, where the swinging member 77 is reciprocated, the upper end in the direction of gravity of the swinging board 78 is always located at an upper position in the direction of gravity than the position where a line L11 drawn vertically from the residue dropping opening 29 crosses the swinging board 78.
At the central portion in the right-and-left direction of the upper part of the swinging board 78, formed is a rectangular hole-like swinging crank through-hole 79 which is an example of a through-hole longer in the left-and-right direction which. The front supported projection 57 of the crank 51 passes through the swinging crank through-hole 79. The swinging member 77 is supported swingably in the left-and-right direction along the swinging crank through-hole 79 from the front supported projection 57. In Embodiment 1, where the swinging member 77 is reciprocated, the lower end in the direction of gravity of the swinging crank through-hole 79 is always located at an upper position in the direction of gravity than the position where the line L11 drawn vertically from the residue dropping opening 29 crosses the swinging board 78.
The swinging board 78 has crank contacts 81a, 81b which are an example of a pair of left and right reciprocation applied segments, formed so as to cross the swinging crank through-hole 79. In Embodiment 1, the interval between the crank contacts 81a and 81b is set so as to be narrower than the rotating diameter of the coil supporting portion 54.
The coil supporting portion 54 supports a coil spring 82 formed of a wire helically shaped so as to be rotatable at the upper end, which is an example of a second loosening member.
In the image forming apparatus U3 according to Embodiment 1 having the above configuration, with an image forming operation, the waste toner is exhausted from the developing device Gy, Gm, Gc, Gk and the residue is recovered by the cleaner CLy, CLm, CLc, CLk. The residue recovered by the cleaner CLy, CLm, CLc, CLk is transported by the augers Cly2 to CLk2 to the developer dropping unit UH11 to UH16 at the rear to flow in from the cleaner transporting path through-hole 4a. The waste toner exhausted from the developing device Gy, Gm, Gc, Gk flows into the developer dropping frame 1 from the developing device use transporting path through-hole 4b by driving the corresponding deteriorated developer transporting member G3k.
The residue within the residue transporting cylinder CLc3 flowed into the developer dropping frame 1 drops on the swinging board 78 downward in the direction of gravity from the residue dropping opening 29 and further drops along the slope to the merging transporting path UH2 to be transported. The residue within the developing device use transporting cylinder G4k flowed into the developer dropping frame 1 drops from the developer dropping opening 36 and further drops along the swinging board 78 to the merging path UH2.
Thus, the residue or waste developer such as the waste toner flowed into the developer dropping unit UH11 to UH16 flows into the merging transporting path UH2 and is transported to the developer recovering vessel UH6 through the dropping direction transporting path UH3 and vessel transporting path UH4, thereby being recovered.
In the developer dropping unit UH12 in Embodiment 1, the developer flowed into the developer dropping frame 1 drops on the upper surface of the swinging board 78 of the swinging member 77. In
Therefore, the swinging member 77 swings to demolish the developer which tends to be solidified or deposited in the developer dropping frame 1. Particularly, as compared with the case where the developer drops vertically, the developer in a high temperature/high humidity environment which tends to be solidified or deposited in the inclining dropping transporting path within the developer dropping frame 1 is demolished, thereby reducing the jamming of the developer.
Now, the swinging member 77 in Embodiment 1 swings not in the up-and-down direction along the dropping transporting direction but in the left-and-right direction perpendicular to the dropping transporting direction, thereby reducing the scattering or floating of the developer within the developer dropping frame 1 as compared with the case where the swinging member moves upward oppositely to the dropping direction. Namely, by swinging the swinging member in the right-and-left direction, upward scattering or floating of the residue dropping from the residue dropping opening 29 is suppressed. Thus, the solidification or deposition of the toner on the inner wall of the transporting body to generate jamming of the developer is reduced, thereby reducing the dirt due to leakage of the developer.
Further, in Embodiment 1, since the upper end of the swinging board 78 is located above the position where the residue drops from the residue dropping opening 29, the deposition of the residue at the dropping position is prevented; and the developer is not prone to enter the gap between the swinging board 78 and the front side inclining wall 7 and the developer entered is not prone to be rubbed and applied on the front side inclining wall 7.
Further, in Embodiment 1, since the swinging member 77 is arranged along the front side inclining wall 7 inclining with respect to the direction of gravity, by gravity, the swinging member 77 is subjected to the force of the component in the direction approaching the front side inclining wall 7. Therefore, as compared with the case where the swinging member in Embodiment 1 is subjected to the force of the component in the direction leaving the front side inclining wall 7, during swing, the swinging member 77 is not prone to be separated from the front side inclining wall 7 and the developer is not prone to enter between the swinging member 77 and the front side inclining wall 7.
In the developer dropping unit UH12 in Embodiment 1, the coil spring 82 is supported by the coil supporting portion 54 so that the coil spring 82 makes a periodic vibration on the swinging board 78 according to the rotation of the coil supporting portion 54 eccentric from the rotary center of the crank 51. For this reason, in Embodiment 1, the developer is more effectively demolished and scraped off downward owing to the vibration of the coil spring 82 as well as the swing of the swinging member 77, thereby further reducing jamming with the developer.
In the developer dropping unit UH12 in Embodiment 1, the crank 51, gear frame 38, swinging member 77, coil spring 82 are united as the gear unit 37a which is integrally detachable from the developer dropping frame 1. The motor unit 61 is integrally detachably supported in the gear unit 37a. Thus, attachment/detachment among the developer dropping frame 1, gear unit 37a and motor unit 61 is facilitated, thereby giving the configuration facilitating assembling or maintenance of the developer dropping unit UH12 and its dismantling in the replacement of worn components.
Next, Embodiment 2 will be explained. In this explanation, like reference symbols refer to like elements in those in Embodiment 1 and will be not explained in detail.
Embodiment 2 is different from Embodiment 1 in the following points, but in other points, constructed similarly to Embodiment 1.
In
In the developer dropping unit UH12 according to Embodiment 2 having the above configuration, where the swinging member 77′ is swung, even when the developer enters the gap between the swinging board 78′ and the front inclining wall 7 from the swinging crank through-hole 79 or the upper end of the swinging board 78, it passes from the front of the swinging board 78′ to the rear thereof through the slit 91. Particularly, a peripheral edge 91a of the slit 91 serving as a scraping-off portion is formed at a position overlapping the swinging crank through-hole 79 in the direction of gravity. By the peripheral edge 91a, the developer entered from the swinging crank through-hole 79 and rubbed on the front side inclining wall 7 are scraped off and exhausted through the slit 91.
Thus, in Embodiment 2, it is possible to suppress obstruction of the swinging of the swinging member 77′ and jamming of the developer as a result that the developer enters the gap between the swinging member 77′ and the front side inclining wall 7 and is solidified or deposited.
Next, Embodiment 3 will be explained. In this explanation, like reference symbols refer to like elements in those in Embodiment 1 and will be not explained in detail.
Embodiment 3 is different from Embodiment 1 in the following points, but in other points, constructed similarly to Embodiment 1.
In
In the developer dropping unit UH12 according to Embodiment 3 having the above configuration, when the swinging member 77″ suffers the swinging force in the right-and-left direction by the rotation of the crank 51, the movement of the swinging member 77″ is limited by the stoppers 92a, 92b. Thus, at a fulcrum in contact with the right stopper 92a displaced downward from the front bearing 7a, as shown in
Accordingly, in the developer dropping unit UH12 in Embodiment 3, as compared with case where the swinging member 77 swings simply in the left-and-right direction as in Embodiments 1 and 2, complicated swinging is generated, thereby reducing jamming of the developer like Embodiments 1 and 2.
Next, Embodiment 4 will be explained. In this explanation, like reference symbols refer to like elements in those in Embodiment 1 and will be not explained in detail.
Embodiment 4 is different from Embodiment 1 in the following points, but in other points, constructed similarly to Embodiment 1.
In
In Embodiment 4, a swinging member 101 is provided in place of the swinging member 77 according to Embodiment 1. A swinging board 102 thereof has, in place of the swinging crank through-hole 79 in Embodiment 1, a long-hole like swinging member supporting pin use through-hole 96 longer in the left-and-right direction which is an example of a supported piece arranged at the position corresponding to the swinging member supporting hole 93. Therefore, unlike Embodiment 1, the swinging member 101 according to Embodiment 4 is not supported by the crank 51 but supported by a supporting pin 97 which is an example of a supporting member, passing through the swinging member supporting pin use through-hole 96 and supported by the swinging member supporting portion 93.
Further, unlike the swinging board 78 in Embodiment 1, the swinging board 102 in Embodiment 4 is formed to have such a length that its upper end is located beneath the front bearing 7a and at an upper position than the position where the region when the residue dropping opening 29 is projected downward in a direction of gravity crosses the front inclining wall 7. In Embodiment 4, the crank contact 81a, 81b is formed in a shape protruding upward from the upper end of the swinging board 102 and located above the swinging member supporting hole 93 in the direction of gravity. Namely, in Embodiment 4, the crank shaft 52 and the swinging member supporting hole 93 are arranged at positions overlapping each other along the direction of gravity, and the swinging member supporting hole 93 and the crank contacts 81a, 81b are arranged at positions not crossing each other along the direction of gravity, at different heights.
In the developer dropping unit UH12 in Embodiment 4 having the above configuration, the swinging member 101 is swingably supported by the supporting pin 97 along the swinging member supporting pin use through-hole 96. Further, the swinging member 101 is swung in the left-and-right direction by the rotation of the crank 51 arranged above the swinging member 101.
Thus, in Embodiment 4, since the supporting portion and rotary shaft are different, the swinging member 101 can be supported with less rattle for the front inclining wall 7 and during the swing, the swinging member 101 can be made more difficult to leave the front inclining wall 7. Thus, it is possible to reduce the application or deposition of the developer in the gap between the swinging member 101 and the front inclining wall 7. Like Embodiments 1 to 3, jamming of the developer can be reduced.
Next, Embodiment 5 will be explained. In this explanation, like reference symbols refer to like elements in those in Embodiments 1, 4 and will be not explained in detail.
Embodiment 5 is different from Embodiments 1, 4 in the following points, but in other points, constructed similarly to Embodiments 1, 4.
Referring to
Right above the front bearing 103, formed is a concave swinging member supporting hole 93′ which is an example of the supporting piece. The swinging member supporting hole 93′ is located at a position near the side when the auger CLc2 rotates in the upward direction from below in the direction of gravity for the residue dropping opening 29. The interval between the front bearing 103 and the swinging member supporting hole 93′ is set to be longer than the rotating radius of the coil supporting portion 54 of the crank 51.
In Embodiment 5, a swinging member 104 is provided in place of the swinging member 77 in Embodiment 1. Instead of the swinging member supporting pin use through-hole 96 in Embodiment 4, the swinging board 106 of the swinging member 104 has a longish hole-like swinging member supporting pin-use inclining through-hole 107 extending from the left lower side to right upper side which is an example of a supported member arranged at the position corresponding to the swinging member supporting hole 93′. The swinging board 106 is swingably supported by a supporting pin 97′ along the swinging member supporting pin-use inclining through-hole 107 from the left lower side to the right upper side, i.e. in the direction obliquely crossing the dropping direction. In Embodiment 5, even when the swinging board 106 is located at the most left position, the upper end of the swinging member 104 is located at an upper position than the position where the region when the residue dropping opening 29 is projected downward in a direction of gravity crosses the front inclining wall 7. In Embodiment 5, as compared with the case of Embodiment 1, the residue dropping opening 29 is formed at the position approaching the left side and toward −Y side.
In the swinging board 106 in Embodiment 5, unlike Embodiments 1, 4, a left crank contact 108 is formed on only the left side of the swinging member supporting pin use inclining through-hole 107. Further, the coil supporting portion 54 of the crank 51 is brought into contact with the left crank contact 108 from the left upper side of the swinging board 106, i.e. from the −Y and +Z side.
In the developer dropping unit UH12 according to Embodiment 5 having the above configuration, as shown in
Further, as shown in
In Embodiment 5, on the left side where the dropping quantity of the residue is larger, i.e. the auger Crc2 rotates in an upward direction from below in the direction of gravity, the swinging member 104 moves from the right upper side toward the left lower side. Therefore, the swinging member 104 moves in an obliquely downward direction having a downward component in the direction of gravity so that it assists the drop of the residue by the force of its downward movement as well as the gravity. On the other hand, on the right side where the dropping quantity of the residue is smaller, the swinging member 104 moves from the left lower side toward the right upper side so that the scattering or floating of the residue generated due to the upward movement of the swinging member 104 is suppressed to the lowest limit. Further, on the side where the dropping quantity of the residue is larger, the swinging member supporting hole 93′ is arranged so that the swinging member 104 is reciprocated mainly on this side. Thus, as compared with the case where the swinging member supporting hole 93′ is arranged on the side where the dropping quantity of the residue is smaller, the demolishing capability is improved.
Further, in Embodiment 5, like Embodiment 4, since the supporting portion is different from the rotary shaft, the swinging member 104 can be supported against the front inclining wall 7 with no rattling. Thus, the swinging member 104 can be made more difficult to leave the front inclining wall 7. So, it is possible to reduce the application or deposition of the developer in the gap between the swinging member 104 and the front inclining wall 7. Like Embodiments 1 to 4, jamming of the developer can be reduced.
Further, in Embodiment 5, the coil supporting portion 54 moves in contact with the left crank contact 108 from above so that the swinging member 104 is pushed by the force applied downward from above while it moves in the right upper direction. Thus, the swinging member 104 suffers the force in the direction component being pushed against the front inclining wall 7. As a result, the swinging member 104 is difficult to leave the front inclining wall 7 and suffers the force from, the front inclining wall 7 side by gravity while it moves in the left lower side. As a result, the swinging member 104 is reciprocated without suffering the force in the direction leaving the front inclining wall 7.
Referring to
Referring to
Referring to
In the developer dropping unit UH12 according to Embodiment 6 having the above configuration, the dropping residue may enter the gap between the swinging board 112 and the front inclining wall 7 through the swinging crank through-hole 113 so that the residue entering from the swinging crank through-hole 113 may be rubbed on the front inclining wall 7 by the swinging member 111. On the other hand, in the swinging member 111 in Embodiment 6, while the swinging member 111 swings, by the scraping-off edges 121a, 121b of the scraping-off slits 119a, 119b formed to the positions horizontally overlapping the swinging crank through-hole 113, i.e. to the height of the swinging crank through-hole 113, the rubbed residue is scraped off and drops downward through the scraping-off slits 119a, 119b. Therefore, as compared with the case where the scraping-off edges 121a, 121b are not provided, solidification or deposition of the residue entering from the swinging crank 113 is reduced.
(Modification)
The explanation has been given of the various embodiments hitherto. However, this invention should not be limited to the above embodiments, but can be modified in various manners within a scope not departing from the sprit of the invention defined in claims. Typical modifications (H01) to (H04) of this invention will be listed below.
The foregoing description of the embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention defined by the following claims and their equivalents.
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