WO2001088632A1 - Image forming unit, method of assembling and disassembling the unit, and image forming device using the unit - Google Patents

Image forming unit, method of assembling and disassembling the unit, and image forming device using the unit Download PDF

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Publication number
WO2001088632A1
WO2001088632A1 PCT/JP2001/004086 JP0104086W WO0188632A1 WO 2001088632 A1 WO2001088632 A1 WO 2001088632A1 JP 0104086 W JP0104086 W JP 0104086W WO 0188632 A1 WO0188632 A1 WO 0188632A1
Authority
WO
WIPO (PCT)
Prior art keywords
image forming
unit
developing
developing roller
gear
Prior art date
Application number
PCT/JP2001/004086
Other languages
French (fr)
Japanese (ja)
Inventor
Noboru Katakabe
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to AU58756/01A priority Critical patent/AU5875601A/en
Publication of WO2001088632A1 publication Critical patent/WO2001088632A1/en

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/18Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
    • G03G21/1803Arrangements or disposition of the complete process cartridge or parts thereof
    • G03G21/181Manufacturing or assembling, recycling, reuse, transportation, packaging or storage
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/18Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
    • G03G21/1803Arrangements or disposition of the complete process cartridge or parts thereof
    • G03G21/1817Arrangements or disposition of the complete process cartridge or parts thereof having a submodular arrangement
    • G03G21/1825Pivotable subunit connection

Definitions

  • the present invention relates to an image forming unit, an assembling method and an assembling method thereof, and an image forming apparatus using the same.
  • the present invention relates to an image forming unit used for an image forming apparatus applicable to a printer, a copying machine, a facsimile, and the like, an assembling method and a disassembling method thereof, and an image forming apparatus using the same.
  • Background art
  • an image forming unit in which a photoreceptor unit having a photoreceptor and a developing unit having a developing roller are connected by a fulcrum pin in a decomposable state and integrated.
  • the driving force is applied from the main body of the image forming apparatus to the developing roller via a oscillating gear and a developing roller gear that are housed in a oscillating lever disposed on an end surface of the main body of the image forming unit and engage with each other.
  • An object of the present invention is to provide an image forming unit having such a configuration, wherein the image forming unit can be easily assembled and disassembled.
  • an image forming unit includes a photoreceptor unit having a photoreceptor that is rotated by a driving force from an image forming apparatus main body, and a photoreceptor unit swayed by a fulcrum pin.
  • a developing unit having a developing roller movably connected and rotating by a driving force from the image forming apparatus main body side;
  • the image forming unit wherein the application of the driving force to the roller is performed via a swing gear and a developing roller gear which are housed in a swing lever arranged on an end face of the image forming unit main body and mesh with each other, After the photosensitive unit and the developing unit are connected by the fulcrum pin, the swing lever is mounted by attaching the developing roller gear to a developing roller shaft.
  • the bottom surface of the swing lever to which the swing gear is attached is configured to abut against the circular protrusion around the fulcrum pin.
  • the photoreceptor unit and the developing unit are connected by the fulcrum pin, and then the swing lever is mounted by attaching the developing roller gear to the developing roller shaft.
  • the bottom surface of the swinging lever can be easily brought into contact with the circular projection around the fulcrum pin.
  • the swing lever becomes an obstacle, and the fulcrum pin is smoothly inserted. I can't do it. This is because the flange of the photoreceptor and the idler gear are located on both sides of the swing lever, and the swing lever cannot be moved freely.
  • the swing lever is attached by attaching the developing roller gear to the developing roller shaft. Because it is designed to be assembled, the imaging unit can be easily assembled.
  • the swing lever may be configured by extracting the developing roller gear from the developing roller shaft. It is preferable that the fulcrum pin be pulled out and then disassembled into the photoreceptor unit and the developing unit.
  • the photoreceptor unit and the development unit disassembled in this way are reassembled after replacing the consumables in the unit.
  • the consumables in the photoconductor unit include a photoconductor, a corona charger, a cleaning blade, and the like.
  • the consumables in the developing unit include toner, a developing roller, a supply roller, a sealing member, a doctor blade. And the like.
  • the swing gear and the fulcrum pin are provided so as to mesh with each other on an axis thereof, and a driving force from the image forming apparatus main body side is applied to the swing gear. It is preferable that a developing drive main body gear to be transmitted is further provided, and at least a part of an upper side of the fulcrum pin is covered with the swing gear. According to this preferred example, since the pressing force of the developing roller against the photoconductor is not generated by the driving force from the image forming apparatus main body side, the pressing of the developing roller against the photoconductor is also performed during driving. The pressure can be maintained at the initial setting.
  • a projection provided around the fulcrum pin is further provided, and a part of the swing lever is preferably brought into contact with the projection. According to this preferred example, the center distance between the swing gear and the developing drive main body gear can be secured.
  • a photoconductor unit having a photoconductor that is rotated by a driving force from the image forming apparatus main body is swingably connected to the photoconductor unit by a fulcrum pin.
  • An assembling method of an image forming unit which is performed via a swing gear and a developing roller gear that are housed in a swing lever and mesh with each other, wherein the photosensitive unit and the developing unit are fixed by the fulcrum pin.
  • the swing lever is attached by attaching the developing roller gear to a developing roller shaft.
  • the photoconductor unit having the photoconductor rotated by the driving force from the image forming apparatus main body is swingably connected to the photoconductor unit by a fulcrum pin.
  • a disassembling method of an image forming unit which is performed through a swing gear and a developing roller gear that are housed in a swing lever arranged on an end surface and mesh with each other, wherein the swing lever is the developing roller gear. After being removed by withdrawing from the developing roller shaft, the fulcrum pin is withdrawn to be disassembled into the photoreceptor unit and the developing unit. And wherein the door.
  • the configuration of the image forming apparatus includes a unit rotating body that rotatably supports a plurality of image forming units in a vertical plane, and sequentially moves the plurality of image forming units to an image forming position.
  • An image forming apparatus for forming an image wherein the image forming unit of the present invention is used as the image forming unit.
  • FIG. 1 is a cross-sectional view illustrating an image forming apparatus according to an embodiment of the present invention
  • FIG. 2 is an external perspective view illustrating an image forming unit according to an embodiment of the present invention
  • FIG. 4 is an exploded perspective view showing the configuration of a developing unit housing and a seal member around the developing roller in FIG. 3, and FIG.
  • FIG. 5 is a right side view of FIG. 6 is a perspective view (with the cover removed) showing a part (right side) of the image forming unit in FIG. 2, and FIG. 7 is an embodiment of the present invention.
  • FIG. 8 is an exploded perspective view (with a cover removed) showing a carriage and a photosensitive member positioning mechanism and a driving mechanism of the image forming apparatus according to the embodiment;
  • FIG. 8 is an image forming apparatus according to an embodiment of the present invention;
  • FIG. 5 is a cross-sectional view (with the cover removed) of a carriage cut along a plane passing through the image forming position of FIG.
  • FIG. 9 is a cross-sectional view showing a part of a swing lever provided in the developing unit in one embodiment of the present invention,
  • FIG. 10 is a left side view of FIG. 2, and
  • FIG. 4 is an explanatory diagram of driving of a photoconductor and a developing port in one embodiment.
  • FIG. 1 is a cross-sectional view illustrating an image forming apparatus according to an embodiment of the present invention.
  • FIG. 2 is an external perspective view showing an image forming unit according to one embodiment of the present invention
  • FIG. 3 is a sectional view taken along line AA of FIG. 2
  • FIG. 4 is a diagram showing a developing unit housing around a developing roller in FIG.
  • FIG. 5 is an exploded perspective view showing the structure of the sealing member
  • FIG. 5 is a right side view of FIG. 2 (with the cover removed)
  • FIG. 6 is a partial perspective view (cover) showing a part (right side) of the image forming unit in FIG. With one removed).
  • FIG. 1 the right end face is the front of the apparatus, and a carriage 2 is provided at substantially the center of the apparatus main body 1, a front door 1A is provided at the front, and a top door 17 is provided at the top.
  • reference numeral 30 denotes a photosensitive member
  • reference numeral 34 denotes a corona charger for uniformly charging the photosensitive member 30 in a negative direction
  • reference numeral 35 denotes a developing roller 31, and supply roller 21 for supplying toner.
  • a developing unit including a seal member 200, a doctor blade 24 for forming a toner layer, and a toner hopper 39 for storing the toner 32.
  • 204 is a swing lever 9 described later. It is a cover for protecting a gear group such as a swing gear 94 including 2.
  • the housing of the developing unit 35 is located between the developing roller 31 and the supply roller 21 to allow the contact between them.
  • a substantially rectangular opening 202 is provided along the longitudinal direction of the roller 31.
  • a receiving portion 201 is provided on one side of the opening 202 along the longitudinal direction of the developing roller 31. Is provided.
  • One side of the receiving portion 201 along the longitudinal direction of the seal member 200 is located, and the other side of the seal member 200 along the longitudinal direction is the opening portion 202.
  • the developing roller 31 is arranged in contact with the wall surface on the other side along the longitudinal direction.
  • Reference numeral 36 denotes a rubber-made cleaning blade for cleaning the toner remaining on the surface of the photoconductor 30 after transfer
  • reference numeral 38 denotes a waste toner removed by the cleaning blade 36.
  • a corona charger 34 and a photoreceptor 30 are attached to the waste toner case to form a photoreceptor unit 37.
  • the photoreceptor unit 37 and the developing unit 35 are swingably connected and integrated by a fulcrum pin 90, thereby forming the image forming unit 3.
  • the photoreceptor 30, the developing roller 31, and the supply roller 217 are each rotatably supported, and each rotate in the direction of the arrow.
  • the toner 32 is a negatively charged toner in which a pigment is dispersed in a polyester resin.
  • the toner 32 is supplied from a supply roller 21 to a developing roller 31 through a supply port 25, and is thinned by a doctor blade 24. After that, the electrostatic latent image is supplied to the photoconductor 30 to develop the electrostatic latent image on the photoconductor 30.
  • the carriage 2 houses image forming units 3Y, 3M, 3C, and 3BK of four colors (yellow, magenta, cyan, and black).
  • the carriage 2 is rotatably supported by the circular tube 21 so that the photoreceptor 30 of the image forming unit 3 of each color is sequentially moved between the image forming position 10 and other retreat positions. Thus, the image forming unit 3 can be switched.
  • the image forming operation position of the image forming unit 3 in the carriage 2 is only at the image forming position 10 where the photoreceptor 30 is irradiated with the pixel laser one signal light 8 and the transfer belt unit 5 and the photoreceptor 30 contact. is there.
  • the image forming unit 3 is connected to a drive source and a power supply of the apparatus main body 1 at the image forming position 10, thereby performing an image forming operation.
  • the other positions are the retraction positions, in which no image forming unit 3 operates.
  • the image forming unit 3 is detachably mounted on the apparatus main body 1.
  • the image forming unit 3 of the color to be replaced is rotated by rotating the carriage 2. It is located below the door 17 and can be replaced by opening the top door 17.
  • the transfer belt unit 5 is for copying the toner image formed on the photoreceptor 30 of the image forming unit 3 at the image forming position 10 and retransferring the transferred toner image to recording paper.
  • the transfer belt unit 5 is composed of an intermediate transfer belt 50 and a group of pulleys for suspending the intermediate transfer belt 50 (a driving pulley 55 A, a knock-up pulley 55 B, a guide pulley 55 C, a tension pulley 55 D) ), A cleaner 51, and a waste toner case 57 for storing the waste toner after cleaning, and these are integrated and detachably attached to the apparatus main body 1.
  • the intermediate transfer belt 50 is formed by coating a fluororesin such as PFA or PTFE on semi-conductive (medium resistance) urethane in the form of an endless belt having a thickness of about 100 m to reduce the overall thickness to 100 m. From a film of 0 to 300 m You.
  • the perimeter of the intermediate transfer belt 50 is slightly longer than the maximum length of A4 receiving paper (297 mm), which is the maximum receiving paper size, for full-color printing of A4 or letter sizes.
  • the cleaner 51 is for cleaning and removing the toner remaining on the intermediate transfer belt 50, and is a screw for conveying the removed toner to the waste toner case 57 with the rubber cleaning blade 53. 5 and 2.
  • the cleaner 51 rotates about a fulcrum 58 in order to prevent the toner image on the intermediate transfer belt 50 from being scraped off while a color image is being formed on the intermediate transfer belt 50. And is separated from the intermediate transfer belt 50.
  • a pulley 55 A is a drive pulley for driving the intermediate transfer belt 50, and also serves as a backup for the cleaning blade 53.
  • the pulley 55B is a backup pulley of the secondary transfer roller 9 for transferring the toner image on the intermediate transfer belt 50 to recording paper.
  • the pulley 55C is a guide pulley, and also serves as a porter for applying a primary transfer bias for transferring a toner image from the photoconductor 30 onto the intermediate transfer belt 50.
  • the pulley 55D is a tension pulley that applies tension to the intermediate transfer belt 50.
  • the intermediate transfer belt 50 is suspended around these pulleys 55A, 55B, 55C and 55D, and can be driven to rotate by the rotation of the drive pulley 55A.
  • Reference numeral 56 denotes a cover for protecting the intermediate transfer belt 50.
  • the transfer belt unit 5 is reliably positioned at a predetermined position when the transfer belt unit 5 is mounted on the apparatus main body 1, and a portion facing the image forming position 10 comes into contact with the photoconductor 30 of the image forming unit 3.
  • each part of the transfer belt unit 5 is electrically connected to the main body side, and the driving pulley 55A is connected to the driving means on the main body side, so that the intermediate transfer belt 50 becomes rotatable.
  • the static elimination needle 7 is for preventing the toner image from being disturbed when the recording paper is separated from the intermediate transfer belt 50.
  • Reference numeral 6 denotes a laser exposure device disposed below the transfer belt unit 5, and the laser exposure device 6 includes a semiconductor laser (not shown), a polygon mirror 6A, a lens system 6B, a first mirror 6C, and the like.
  • the pixel laser signal light 8 corresponding to the time-series electrical pixel signals of the image information is composed of the yellow image forming unit 3 Y photoreceptor unit 37 and the black image forming unit 3 B k in FIG. It passes through an optical path 22 formed between the unit 35 and the unit 35.
  • the pixel laser signal light 8 passes through the exposure window 97 of the tube 21 and the second mirror 98 fixed to the apparatus body 1 in the tube 21 (still stands irrespective of the tube 21).
  • 1 2 is a paper feed unit
  • 14 is a paper feed port
  • 16 is a registration roller
  • 18 is a paper discharge roller
  • 13 a, 13 b, 13 c, and 13 d are these ports.
  • This is a paper guide that connects between the rollers and the contact point between the intermediate transfer belt 50 and the secondary transfer roller 9 and the fixing device 15.
  • the front door 1A is hinged to the device main body 1 by a hinge shaft 1B, and can be opened by leaning to the front.
  • a settler 15, secondary transfer roller 9, static elimination needle 7, paper guide 13 a, 13 b, 13 c, 13 d Front side and registration roller 1 The front side of 6 is attached, and when the front trigger 1A is moved forward, these components also fall at the same time. For this reason, the front surface of the apparatus main body 1 can be largely released, and the transfer belt unit 5 can be attached and detached from this portion, and The recording paper can be easily removed even when the paper is jammed.
  • FIG. 7 is an exploded perspective view (with a cover removed) showing a carriage and a photoconductor positioning mechanism and a drive mechanism of the image forming apparatus according to an embodiment of the present invention
  • FIG. 8 is an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view (with a cover removed) of the carriage taken along a plane passing through an image forming position of the image forming apparatus in FIG.
  • flanges 41 R and 41 L having taper holes 48 R and 48 L for positioning the image forming unit 3 are adhered to both ends of the photoconductor 30.
  • the outer circumferences of the flanges 41 R and 41 L are rotatably attached to photoconductor bearings 43 R and 43 L fixed to the side wall of the photoconductor unit 37.
  • a coupling claw portion 47 for rotating and driving the photoconductor 30 is provided at the end of the flange 4 1 R.
  • the coupling claw portion 47 can be engaged with the coupling plate 61 on the main body side. It has become.
  • a right side wall 20 R and a left side wall 20 L are fixed to the center circular tube 21 of the carriage 2.
  • partition ribs 23 are fixedly arranged at four places so as to divide the inner part of the carriage 2 into four parts, and the inside of the carriage 2 divided by the partition ribs 23 is provided.
  • An image forming unit 3 of each color is arranged in each space of.
  • the circular tube 21 is provided with exposure windows 97 at a total of four positions through which the pixel laser signal light 8 for exposing the photoconductor passes.
  • the carriage 2 is rotatably supported on left and right main body side walls 1 R, 1 L via bearings 46 R, 46 L.
  • a carriage gear 28 is formed on the outside of the left side wall 20 L.
  • the carriage gear 28 is connected to a carriage driving mechanism 86 provided on the main body side. Is tied.
  • the carriage drive mechanism 86 includes a worm 89 connected to a drive source (not shown), a worm wheel 88, and a gear 87 integrated with the worm wheel 88 and engaged with the carriage gear 28.
  • the carriage 2 is freely rotated and positioned by the rotation of the carriage drive mechanism 86.
  • 45 R, 45 L are fixed to the left and right main body side walls 1 R, 1 L, and prevent the image forming unit 3 provided in the lower half along the outer periphery of the carriage 2 from dropping from the carriage 2. It is a fall prevention guide for.
  • the second mirror 198 is firmly attached to the main body side walls 1R and 1L by a fixing member (not shown) substantially in the vicinity of the center of the circular tube 21 and is always irrespective of the rotation of the carriage 2. It is configured to keep the stationary state.
  • the side walls 20R and 20L are provided with cutouts 26R and 26L at portions where the flanges 41R and 41L of the image forming unit 3 are inserted.
  • the notches 26 R, 26 L and the partition ribs 23 serve as guides when the image forming unit 3 is mounted in the carriage 2. At the side or below the carriage 2, the image forming unit 3 is guided by the fall prevention guide 45 R 45 L and does not separate from the carriage 2.
  • the dimensions of the notches 26 R and 26 L are set larger than the outer diameters of the flanges 41 R and 41 L, and the photoconductor 30 is positioned at the image forming position 10 and the reference position.
  • the photoconductor 30 is provided with play in all directions with respect to the carriage 2 at the regular position. In the present embodiment, this play is ensured at about l mm, so that the positioning operation of the photoconductor 30 is not hindered even if the positioning accuracy of the carriage 2 is somewhat poor.
  • the photoreceptor drive mechanism 60 is provided on each side wall 1R, 1L of the apparatus main body 1 to accurately position the photoreceptor 30 at the image forming position 10.
  • a mechanism 80 is provided.
  • the photoconductor drive mechanism 60 is provided on the right main body side wall 1R, and includes an output shaft 70, a coupling plate 61 fixed to the output shaft 70 and rotating integrally with the output shaft 70, and an output shaft drive. It comprises a gear 71 and a drive mechanism for driving these.
  • the output shaft 70 is movably and rotatably supported in a thrust direction between bearings 77 fixed between the right main body side wall 1R and the base plate 67 fixed thereto.
  • One end of the output shaft 70 is formed with a tapered tip portion 75 having a convex tapered surface following the tapered hole 48R of the photoconductor 30, and the other end of the output shaft 70 is provided. Is formed in a spherical shape so as to contact the thrust bearing 69 R with a small area.
  • the output shaft drive gear 71 is a helical gear, and the output shaft drive gear 71 is fixed to the output shaft 70 so as to mesh with the driving gear 72.
  • Reference numeral 4 denotes a compression spring inserted between the bearing 7 7 and the output shaft driving gear 7 1.
  • the compression spring 7 connects the output shaft 7 and the force coupling plate 6 1 to the photoreceptor 3 side flange 4. This is for always energizing to a position away from 1R ( Figure 7 shows the engaged position).
  • the output shaft 70 is driven by a driving means (not shown) for moving the thrust bearing 69 R, so that the position separated from the flange 41 R, the tapered hole 48 R shown in FIG. Can be moved against the mating engagement position against the panel force, but in any position, the output shaft drive gear 71 is driven so that it engages with the drive side gear 72.
  • the side gear 72 has a wide tooth width.
  • the force coupling plate 61 is used for transmitting power by engaging with the coupling claw portion 47 of the flange 41 R, and has eight coupling claws 65 at its tip.
  • the detent mechanism 80 provided on the left main body side wall 1L will be described.
  • the detent mechanism 80 is supported through a bearing 78 between the left main body side wall 1 L and the substrate 68, and is driven by a drive mechanism (not shown) for moving the thrust bearing 69 L and a compression panel 85. It is constituted by a detent shaft 81 that can move and rotate in the direction. One end of the detent shaft 81 is formed with a tapered surface 84 following the tapered hole 48 L of the flange 41 L, and the other end of the detent shaft 81 is spherical, like the output shaft 70. And pressed against 69 L of thrust bearing.
  • Reference numeral 8 5 denotes a compression spring inserted between the left side wall 1 L of the left main body and the panel stop 8 2 fixed to the detent shaft 8 1. It is for keeping away from 1 L.
  • the image forming unit 3 supported by the carriage 2 is carried to the image forming position with the output shaft 70 and the detent shaft 81 separated from the flanges 41 R and 41 L of the photoconductor 30.
  • the thrust bearings 69 R and 69 L are pushed inward by the drive mechanism, and the tapered end 75 of the output shaft 70 is inserted into the tapered hole 48 of the flange 41 R and the detent shaft 8
  • the 1 tapered surface 84 is engaged with the tapered hole 48 L of the flange 41 L, and the photoconductor 30 is accurately positioned at the image forming position 10.
  • FIG. 9 is a cross-sectional view showing a part of a swing lever provided in the developing unit according to one embodiment of the present invention
  • FIG. 10 is a left side view of FIG.
  • the right side wall 37R of the photoreceptor unit 37 is provided with a cylindrical projection 91 having a pin through hole. .
  • a positioning hole 1 16 force is formed in the right side wall 35 R of the developing unit 35.
  • the left side wall 37 L of the photoreceptor unit 37 has a guide groove 115 for guiding the developer port 31 in the direction of the photoreceptor 30.
  • the side walls 35 R, 35 L of the developing unit 35 are disposed inside the side walls 37 R, 37 L of the photoconductor unit 37.
  • the pin holes of the projections 91 provided on the right side wall 37 R of the photoreceptor unit 37 and the positioning holes provided on the right side wall 35 R of the developing unit 35 1 1 6 and the fulcrum pin 90 is inserted from the outside of the right side wall 37R of the photoreceptor unit 37 to the pin hole of the protrusion 91 and the positioning hole 116.
  • the right side wall 37R of the photoreceptor unit 37 and the right side wall 35R of the developing unit 35 are connected.
  • the developing roller 31 is a bearing 105 fixed to the right side wall 35 R and the left side wall 35 L of the developing unit 35, respectively. It is rotatably supported at 106.
  • the bearing 106 is fitted into the guide groove 1 15 on the left side wall 37 L of the photoconductor unit 37.
  • the left side of the developing unit 35 can move along the guide groove 115 along with the developing unit 35 with respect to the photoconductor unit 37.
  • a guide bin 108 is inserted into a hole 107 provided in the left side wall 35 L of the developing unit 35, but this does not determine the positions of both. Both are arranged with a play of about l mm.
  • the photoreceptor unit 37 and the developing unit 35 are combined in the above configuration, and the right side wall 37R of the photoreceptor unit 37 and the right side wall 35R of the developing unit 35 are hung between them.
  • the developing panel 31 is rotated about the fulcrum pin 90 by the compression panel 102, thereby stopping the developing roller 31 while being pressed against the photoconductor 30.
  • the left side wall 37 L of the photoconductor unit 37 and the left side wall 35 L of the developing unit 35 are formed by the bearing 106 of the developing roller 31 and the left side wall 37 of the photoconductor unit 37.
  • the developing roller 31 is attracted to the photoconductor 30 side by the tension coil panel 110, which is stretched between the pin 111 and the pin 111, and thereby the developing port roller 31 is moved to the photoconductor. Stops when pressed to 30.
  • the developing roller 31 is composed of a developing drive main body gear 62 attached to the main body side wall 1, a swing gear 94, and a developing opening roller 3 1. Is driven to rotate via a developing roller gear 96 fixed to the roller.
  • the development drive body gear 62 is fixed to a development drive shaft 63 rotatably mounted on the right body side wall 1R and the substrate 67 via a bearing 66, and the development drive shaft 63 is used for the development drive shaft 63.
  • the developer is rotated from the main body via a developing drive pulley 164 fixed to the drive shaft 63.
  • the gear 9.9 is a gear fixed to the supply roller 217, and is driven to rotate via a developing roller gear 96 and an idler gear 214.
  • the swing gear 94 Through a pin 93 to a swing lever 92, which is attached to the bearing 105 fixed to the right side wall 35R and the developing roller shaft 215 around the developing roller shaft 215. It is attached rotatably.
  • a tension panel 104 is hung on the swing lever 92 to thereby urge the swing gear 94 toward the developing drive main body gear 62, but the bottom surface of the swing lever 92 is a photoconductor.
  • the unit 37 is stopped by abutting on the circular projection 91 around the fulcrum pin 90 of the right side wall 37R of the unit 37.
  • FIG. 11 is a view for explaining only a main part for driving the photoconductor 30 and the developing roller 31.
  • reference numeral 96 denotes a developing roller gear
  • 94 denotes a swing gear
  • 62 denotes an image drive main body gear
  • 20 R denotes a portion protruding inside the right side wall of the carriage 2.
  • 90 is a fulcrum pin connecting the developing unit 35 and the photoconductor unit 37
  • 91 is a circular projection provided on the right side wall 37R of the photoconductor unit 37.
  • the circular protrusion 91 and the swing gear 94 fall into the cutout 29 of the right side wall 20R of the carriage 2, and the swing gear 94 meshes with the developing drive main body gear 62. For this reason, the image forming unit 3 When the head is shaken with the center as the center, the circular protrusion 91 contacts the side surface 27 of the notch 29.
  • the image forming unit 3 when the photosensitive member 30 is coupled to the output shaft 70 and the detent shaft 81 and is positioned at a regular position, and when the developing drive main body gear 62 rotates, the image forming unit 3 is moved from the apparatus main body 1. Both ends of the central axis of the photoconductor 30 are supported. In this state, when the photoconductor 30 and the developing drive main body gear 62 rotate, the image forming unit 3 receives a counterclockwise rotation moment about the center axis of the supported photoconductor 30. This rotational moment is stopped by the circular projection 91 contacting the side surface 27 of the cutout 29 of the carriage side wall 20R.
  • the image forming unit 3 when the image forming unit 3 performs an image forming operation at the image forming position 10, the image forming unit 3 is moved from the device main body 1 to both ends of the central axis of the photoconductor 30 and the right side wall 3 of the photoconductor unit 37.
  • the circular projection portion 9R of 7R is supported at three places. For this reason, the photosensitive member 30 can be reliably positioned with respect to the apparatus main body 1, and the image forming unit 3 is twisted by receiving the developing driving force, thereby ensuring the contact between the photosensitive member 30 and the developing roller 31. There is no problem that it becomes difficult to perform.
  • the circular protrusion 91 is provided on the right side wall 37R of the photoconductor unit 37, the rotational force of the entire image forming unit 3 is supported by only the photoconductor unit 37. Therefore, the contact state between the photoconductor 30 and the developing roller 31 is not affected.
  • the swing gear 94 and the developing drive main body gear 62 mesh with each other at substantially the center of a fulcrum pin 90 which is a fulcrum of rotation of the developing unit 35 with respect to the photoconductor unit 37.
  • the power received by the development unit 35 from the development drive main body gear 62 is in the direction of the arrow P, which is the pressure angle direction of both gears, and this force causes the fulcrum pin of the development unit 35 to the photoconductor unit 37.
  • No torque is generated around 90, and the developing roller 3 1
  • the pressing force between the developing roller 31 and the photoconductor 30 is not generated by the driving force of the apparatus main body 1.
  • the pressing force of the developing roller 31 against the photoconductor 30 is determined by the spring force Q (the pressing force of the compression spring 102) that is initially set even during the rotation of the developing roller 31. Only the rotational force and the pulling force of the pulling coil panel 110 provided on the left side wall 37 L of the photoreceptor unit 37, and the photoreceptor 30 and the developing roller 31 are always stably contacted with a light force. It can be done. Even if the direction of the force that the developing unit 35 receives from the developing drive main body gear 62 slightly changes due to the fluctuation of the engagement between the swing gear 94 and the developing drive main body gear 62, the developing roller 3 1 And the pressing force of the photoconductor 30 does not fluctuate.
  • the spring force Q the pressing force of the compression spring 102
  • the configuration is simple, inexpensive and high performance. It is effective in realizing.
  • the developing unit 31 is supplied with the developing roller 31, the supply roller 217, the sealing member 200, and the doctor blade 24 in the housing of the developing unit, and the toner hopper 39 is supplied with the toner 32.
  • the toner hopper 39 is supplied with the toner 32.
  • the photoreceptor unit 37 is assembled by incorporating the photoreceptor 30, the corona charger 34 and the cleaning blade 36 into the housing of the photoreceptor unit (see FIG. 3).
  • the side walls 35 R, 35 L of the developing unit 35 are arranged inside the side walls 37 R, 37 L of the photoconductor unit 37, and the photoconductor unit is disposed.
  • 3 7 Right side wall 3 7 Protrusion provided on R 9 1 Pin hole for 1 and right side wall of developing unit 3 5 3 5 Align with the positioning holes 1 16 provided in the R, and support the fulcrum from the outside of the right side wall 37 R of the photoreceptor unit 37 to the pin holes of the projections 91 and the positioning holes 1 16.
  • the bearing 106 for the developing roller 31 fixed to the left side wall 35 L of the developing unit 35 is attached to the left side wall 37 L side of the photoconductor unit 37. It is in a state of being fitted into the guide grooves 1 15. As described above, the photoreceptor unit 37 and the developing unit 35 are swingably connected by the fulcrum pin 90 to be integrated.
  • the swing lever 92 to which the swing gear 94 is attached protrudes from the right side wall 35R of the developing unit 35 together with the developing roller gear 96.
  • an E-ring 203 is fitted to the tip of the developing roller shaft 215 to prevent it from falling off.
  • a tension spring 104 is applied to the swing lever 92.
  • the oscillating gear 94 is urged toward the developing drive main unit gear 62, but the bottom surface of the oscillating lever 92 is around the fulcrum pin 90 of the right side wall 37R of the photosensitive unit 37. It stops when it comes into contact with the circular projections 91 of.
  • the cover 204 is attached so as to cover the swing lever 92 and the like.
  • the swing lever 92 is moved together with the developing roller gear 96 to the developing unit 3.
  • the image forming unit 3 can be easily assembled. That is, after attaching the swing lever 92 together with the developing roller gear 96 to the developing roller shaft 211 protruding from the right side wall 35R of the developing unit 35, the photoconductor unit 3 is supported by the fulcrum pin 9.
  • the projection 91 provided on the right side wall 37 R of the photoconductor unit 37 and the positioning holes 1 1 6 provided on the right side wall 35 R of the developing unit 35 are included.
  • the swing lever 92 becomes an obstacle and the fulcrum pin 90 can be inserted smoothly.
  • the flange 41R of the photoconductor 30 and the idler gear 214 are located on both sides of the swing lever 92, and the swing lever 92 can be freely moved. This is because they will not be able to do so.
  • the bottom surface of the oscillating lever 92 is mounted around the fulcrum pin 90.
  • the photoreceptor unit 37 and the developing unit 35 are swingably connected by a fulcrum pin 90.
  • the swing lever 92 is removed from the developing roller shaft 215 together with the developing opening gear 96.
  • the fulcrum pin 90 is removed from the outside of the right side wall 37R of the photoconductor unit 37.
  • the developing unit 35 and the photoconductor unit 37 can be separated.
  • the swing gear 94 can be arranged at a position overlapping directly above the swing fulcrum pin 90. That is, at least a part of the upper side of the fulcrum pin 90 is covered with the oscillating gear 94. Therefore, as described above, It is possible to easily adopt a configuration in which the rotating member 31 is pressed against the photosensitive member 30 with a stable pressing force. In addition, in the state where the image forming unit 3 is assembled, there is no possibility that the fulcrum pin 90 is accidentally removed.
  • the consumables in the developing unit 35 include a toner 32, a developing port 31, a supply roller 21, a sealing member 200, a doctor blade 24, and the like.
  • the consumables in the photoconductor unit 37 include a photoconductor 30, a corona charger 34, a cleaning blade 36, and the like.
  • the image forming unit 3 is assembled with the consumables replaced. I can do it.
  • an E-ring 203 for retaining the swing lever 92 is fitted to the tip of the developing roller shaft 211. It is not limited. If the cover 204 that covers the side wall of the image forming unit 3 (see Fig. 2) also has the function of preventing the swing lever 92 from coming off, an E-ring can be attached to the end of the developing roller shaft 211. There is no need to fit 203, and the disassembly and assembly of the image forming unit 3 is further facilitated.
  • the fixing unit 15 heats up, and the polygon mirror 1 of the laser exposure apparatus 6 is heated. A starts rotating and preparation is completed.
  • the initialization mode for maintaining the state of the photoconductor 30 and the intermediate transfer belt 50 may be operated.
  • the detection means (not shown) is activated in accordance with the timing at which the portion uniformly charged by the corona charger 34 on the surface of the photoconductor 30 comes to the exposure position.
  • the head position of the intermediate transfer belt 50 is detected, and in synchronization with this detection signal, the photoreceptor 30 is irradiated with the pixel laser signal light 8 corresponding to the image signal from the laser exposure unit 6.
  • the pixel laser signal light 8 is irradiated onto the uniformly charged photoreceptor 30, an electrostatic latent image is formed according to the image signal, and the electrostatic latent image is sequentially visualized by the developing unit 35.
  • a toner image is formed.
  • the toner image formed on the photoconductor 30 moves to a primary transfer position in contact with the intermediate transfer belt 50, and is sequentially transferred to the intermediate transfer belt 50 at this primary transfer position.
  • the yellow image forming operation ends after the end of the image is transferred to the intermediate transfer belt 50, and the photoconductor 30 and the intermediate transfer belt 50 stop at the initial position.
  • the corona charger 34 charges the photoconductor 30 to ⁇ 450 V, and the exposure potential of the photoconductor 30 becomes 150 V. Further, a DC voltage of 125 V is applied to the developing roller 31. Further, a DC voltage of +1.0 kV is applied to the guide pulley 55 C and the tension pulley 55 D of the intermediate transfer belt 50.
  • the drive source of the apparatus main body 1 engaged with the yellow photosensitive member 30 is connected to the photosensitive member 1.
  • the engagement is released, and the carriage 2 rotates 90 ° in the direction of the arrow.
  • the yellow image forming unit 3Y moves from the image forming position 10
  • the magenta image forming unit 3M is positioned at the image forming position 10 and stopped.
  • the drive source of the apparatus body 1 engages with the magenta photoconductor 30, the image forming unit 3M and the transfer belt unit 5 start operating, and The same image forming operation as in the first case is performed.
  • yellow and magenta toner images are superimposed on the intermediate transfer belt 50.
  • the secondary transfer roller 9 After the black toner image has been transferred to the intermediate transfer belt 50, when the top of the image comes to the position of the secondary transfer roller 9, the secondary transfer roller 9 is brought into contact with the intermediate transfer belt 50 to feed the paper. By transporting the recording paper sent from the unit 12 between the secondary transfer roller 9 and the intermediate transfer belt 50, the toner images of four colors are collectively transferred onto the recording paper. At this time, a voltage of +800 V is applied to the secondary transfer roller 9. The recording paper onto which the toner image has been transferred passes through a fixing device 15 and is fixed, and is discharged out of the apparatus from a discharge roller 18.
  • the intermediate transfer belt 50 and the image forming unit 3 stop again, and the carriage 2 rotates by 90 °. Then, the yellow image forming unit 3Y reaches the image forming position 10 again and is prepared for the next color image forming operation.
  • an image forming unit that can be easily assembled can be realized, so that an image forming unit used in an image forming apparatus that requires replacement of consumables such as toner is required.

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Abstract

An image forming unit capable of being assembled and disassembled easily, comprising a light-sensitive body unit (37) having a light-sensitive body (30) rotated by a driving force from an image forming device main body side and a developing unit (35) having a developing roller swingably connected to the light-sensitive body unit (37) through a pivot pin (90) and rotated by a driving force from the image forming device main body side, wherein the driving force from the image forming device main body side to the developing roller is given through a swing gear (94) and a developing roller gear (96) stored in a swing lever (92) and meshed with each other and, after the light-sensitive body unit (37) is connected to the developing unit (35) through the pivot pin (90), the swing lever (92) is installed by fitting the developing roller gear (96) onto a developing roller shaft (215) so as to assemble the image forming unit.

Description

明 細 書 像形成ユニット、 並びにその組立方法及び分解方法、 並びにそれを用い た画像形成装置 技術分野  TECHNICAL FIELD The present invention relates to an image forming unit, an assembling method and an assembling method thereof, and an image forming apparatus using the same.
本発明は、 プリンタ、 複写機、 ファクシミリ等に応用可能な画像形成 装置に用いられる像形成ュニット、 並びにその組立方法及び分解方法、 並びにそれを用いた画像形成装置に関する。 背景技術  The present invention relates to an image forming unit used for an image forming apparatus applicable to a printer, a copying machine, a facsimile, and the like, an assembling method and a disassembling method thereof, and an image forming apparatus using the same. Background art
この種の像形成ユニットとしては、 感光体を有する感光体ユニットと 現像ローラを有する現像ュニットとを、 分解可能な状態で支点ピンによ つて連結し、 一体化したものが知られている。 この場合、 画像形成装置 本体側から現像 —ラへの駆動力の付与は、 像形成ュニット本体の端面 に配置された揺動レバー内に収容され互いに嚙み合う揺動ギア及び現像 ローラギアを介して行われる。 発明の開示  As this type of image forming unit, there is known an image forming unit in which a photoreceptor unit having a photoreceptor and a developing unit having a developing roller are connected by a fulcrum pin in a decomposable state and integrated. In this case, the driving force is applied from the main body of the image forming apparatus to the developing roller via a oscillating gear and a developing roller gear that are housed in a oscillating lever disposed on an end surface of the main body of the image forming unit and engage with each other. Done. Disclosure of the invention
本発明は、 かかる構成の像形成ユニットであって、 組立及び分解が容 易な像形成ュニッ卜を提供することを目的とする。  An object of the present invention is to provide an image forming unit having such a configuration, wherein the image forming unit can be easily assembled and disassembled.
前記目的を達成するため、 本発明に係る像形成ユニットの構成は、 画 像形成装置本体側からの駆動力によって回転する感光体を有する感光体 ュニットと、 前記感光体ュニッ卜に支点ピンによって揺動自在に連結さ れ、 前記画像形成装置本体側からの駆動力によって回転する現像ローラ を有する現像ュニッ卜とを備え、 前記画像形成装置本体側から前記現像 ローラへの駆動力の付与が、 像形成ュニット本体の端面に配置された揺 動レバー内に収容され互いに嚙み合う揺動ギア及び現像ローラギアを介 して行われる像形成ュニットであって、 前記感光体ュニットと前記現像 ユニットを前記支点ピンによって連結した後、 前記揺動レバ一を、 前記 現像ローラギアを現像ローラ軸に取り付けることによって装着すること により組み立てられることを特徴とする。 In order to achieve the above object, an image forming unit according to the present invention includes a photoreceptor unit having a photoreceptor that is rotated by a driving force from an image forming apparatus main body, and a photoreceptor unit swayed by a fulcrum pin. A developing unit having a developing roller movably connected and rotating by a driving force from the image forming apparatus main body side; The image forming unit wherein the application of the driving force to the roller is performed via a swing gear and a developing roller gear which are housed in a swing lever arranged on an end face of the image forming unit main body and mesh with each other, After the photosensitive unit and the developing unit are connected by the fulcrum pin, the swing lever is mounted by attaching the developing roller gear to a developing roller shaft.
揺動ギアと現像駆動本体ギアの中心間距離を正しく確保するために、 揺動ギアが取り付けられた揺動レバーの底面が支点ピンの周りの円形突 起部に当接するように構成されるが、 前記本発明の像形成ュニットの構 成によれば、 感光体ユニットと現像ユニットを支点ピンによって連結し た後、 揺動レバーを、 現像ローラギアを現像ローラ軸に取り付けること によって装着することにより組み立てるようにされているので、 揺動レ バーの底面を支点ピンの周りの円形突起部に容易に当接させることがで さる。  In order to properly secure the center-to-center distance between the swing gear and the developing drive body gear, the bottom surface of the swing lever to which the swing gear is attached is configured to abut against the circular protrusion around the fulcrum pin. According to the configuration of the image forming unit of the present invention, the photoreceptor unit and the developing unit are connected by the fulcrum pin, and then the swing lever is mounted by attaching the developing roller gear to the developing roller shaft. As a result, the bottom surface of the swinging lever can be easily brought into contact with the circular projection around the fulcrum pin.
また、 揺動レバ一を装着した後に、 感光体ユニットと現像ユニットと を支点ピンによって連結する組立手順では、 支点ピンを挿入する際に、 揺動レバーが障害となり、 支点ピンをスムーズに挿入することができな い。 揺動レバーの両側方には感光体のフランジとアイドラ一ギアとが位 置しており、 揺動レバ一を自由に移動させることができなくなるからで ある。 この点で、 前記本発明の像形成ユニットの構成によれば、 感光体 ュニットと現像ュニットを支点ピンによって連結した後、 揺動レバーを- 現像ローラギアを現像ローラ軸に取り付けることによって装着すること により組み立てるようにされているので、 像形成ュニットを簡単に組み 立てることができる。  In addition, in the assembly procedure in which the photosensitive member unit and the developing unit are connected by the fulcrum pins after the swing lever is attached, when the fulcrum pin is inserted, the swing lever becomes an obstacle, and the fulcrum pin is smoothly inserted. I can't do it. This is because the flange of the photoreceptor and the idler gear are located on both sides of the swing lever, and the swing lever cannot be moved freely. In this regard, according to the configuration of the image forming unit of the present invention, after the photosensitive unit and the developing unit are connected by the fulcrum pin, the swing lever is attached by attaching the developing roller gear to the developing roller shaft. Because it is designed to be assembled, the imaging unit can be easily assembled.
また、 前記本発明の像形成ユニットの構成においては、 前記揺動レバ —を、 前記現像ローラギアを前記現像ローラ軸から抜き取ることによつ て取り外した後、 前記支点ピンを抜き取ることにより、 前記感光体ュニ ットと前記現像ュニットとに分解されるのが好ましい。 このようにして 分解された感光体ュニットと現像ュニットは、 ュニット内の消耗品を交 換した後、 再度組み立てられる。 感光体ユニット内の消耗品としては、 感光体、 コロナ帯電器、 クリーニングブレード等が挙げられ、 現像ュニ ット内の消耗品としては、 トナー、 現像ローラ、 供給ローラ、 シール部 材、 ドクターブレード等が挙げられる。 In the configuration of the image forming unit according to the present invention, the swing lever may be configured by extracting the developing roller gear from the developing roller shaft. It is preferable that the fulcrum pin be pulled out and then disassembled into the photoreceptor unit and the developing unit. The photoreceptor unit and the development unit disassembled in this way are reassembled after replacing the consumables in the unit. The consumables in the photoconductor unit include a photoconductor, a corona charger, a cleaning blade, and the like. The consumables in the developing unit include toner, a developing roller, a supply roller, a sealing member, a doctor blade. And the like.
また、 前記本発明の像形成ユニットの構成においては、 前記揺動ギア と前記支点ピンの軸線上で嚙み合うように設けられ、 前記画像形成装置 本体側からの駆動力を前記揺動ギアに伝達する現像駆動本体ギアをさら に備え、 前記支点ピンの少なくとも一部の上方側が前記揺動ギアによつ て被覆されているのが好ましい。 この好ましい例によれば、 画像形成装 置本体側からの駆動力によって現像ローラの感光体への押し付け力が発 生することはないので、 駆動時においても、 現像ローラの感光体に対す る押圧力を初期設定時の値に維持することができる。 また、 像形成ュニ ットが組み立てられた状態で、 支点ピンが誤って外されるおそれが無く なる。 また、 像形成ユニットの分解時に、 支点ピンを揺動レバーよりも 先に外してしまうおそれがなく、 揺動レバーを取り外す際には、 現像ュ ニットと感光体ュニットとが一体的に取り付けられているので、 取り外 し作業を円滑に行うことができる。 また、 この場合には、 前記支点ピン の周りに設けられた突起部をさらに備え、 前記揺動レバーの一部を前記 突起部に当接させるようにするのが好ましい。 この好ましい例によれば, 揺動ギアと現像駆動本体ギアの中心間距離を確保することができる。  In the configuration of the image forming unit of the present invention, the swing gear and the fulcrum pin are provided so as to mesh with each other on an axis thereof, and a driving force from the image forming apparatus main body side is applied to the swing gear. It is preferable that a developing drive main body gear to be transmitted is further provided, and at least a part of an upper side of the fulcrum pin is covered with the swing gear. According to this preferred example, since the pressing force of the developing roller against the photoconductor is not generated by the driving force from the image forming apparatus main body side, the pressing of the developing roller against the photoconductor is also performed during driving. The pressure can be maintained at the initial setting. In addition, there is no possibility that the fulcrum pin is accidentally detached when the image forming unit is assembled. Also, when disassembling the image forming unit, there is no danger that the fulcrum pin will be removed before the swing lever, and when the swing lever is removed, the developing unit and the photoconductor unit are attached together. The removal work can be done smoothly. In this case, it is preferable that a projection provided around the fulcrum pin is further provided, and a part of the swing lever is preferably brought into contact with the projection. According to this preferred example, the center distance between the swing gear and the developing drive main body gear can be secured.
また、 本発明に係る像形成ユニットの組立方法は、 画像形成装置本体 側からの駆動力によって回転する感光体を有する感光体ユニットと、 前 記感光体ュニットに支点ピンによって揺動自在に連結され、 前記画像形 成装置本体側からの駆動力によって回転する現像ローラを有する現像ュ ニットとを備え、 前記画像形成装置本体側から前記現像ローラへの駆動 力の付与が、 像形成ュニット本体の端面に配置された揺動レバ一内に収 容され互いに嚙み合う揺動ギア及び現像ローラギアを介して行われる像 形成ュニットの組立方法であって、 前記感光体ュニットと前記現像ュニ ットを前記支点ピンによって連結した後、 前記揺動レバーを、 前記現像 ローラギアを現像ローラ軸に取り付けることによって装着することを特 徴とする。 Further, according to the method for assembling an image forming unit according to the present invention, a photoconductor unit having a photoconductor that is rotated by a driving force from the image forming apparatus main body is swingably connected to the photoconductor unit by a fulcrum pin. The image form A developing unit having a developing roller that is rotated by a driving force from the main body of the image forming apparatus, wherein the application of the driving force from the main body side of the image forming apparatus to the developing roller is disposed on an end surface of the main body of the image forming unit. An assembling method of an image forming unit which is performed via a swing gear and a developing roller gear that are housed in a swing lever and mesh with each other, wherein the photosensitive unit and the developing unit are fixed by the fulcrum pin. After the connection, the swing lever is attached by attaching the developing roller gear to a developing roller shaft.
また、 本発明に係る像形成ユニットの分解方法は、 画像形成装置本体 側からの駆動力によって回転する感光体を有する感光体ュニッ卜と、 前 記感光体ュニットに支点ピンによって揺動自在に連結され、 前記画像形 成装置本体側からの駆動力によって回転する現像ローラを有する現像ュ ニットとを備え、 前記画像形成装置本体側から前記現像ローラへの駆動 力の付与が、 像形成ュニット本体の端面に配置された揺動レバー内に収 容され互いに嚙み合う揺動ギア及び現像ローラギアを介して行われる像 形成ユニットの分解方法であって、 前記揺動レバーを、 前記現像ローラ ギアを前記現像ローラ軸から抜き取ることによって取り外した後、 前記 支点ピンを抜き取ることにより、 前記感光体ュニットと前記現像ュニッ トとに分解することを特徴とする。  Further, according to the method of disassembling the image forming unit of the present invention, the photoconductor unit having the photoconductor rotated by the driving force from the image forming apparatus main body is swingably connected to the photoconductor unit by a fulcrum pin. A developing unit having a developing roller that is rotated by a driving force from the image forming apparatus main body side, wherein the application of the driving force from the image forming apparatus main body side to the developing roller is performed by the image forming unit main body. A disassembling method of an image forming unit, which is performed through a swing gear and a developing roller gear that are housed in a swing lever arranged on an end surface and mesh with each other, wherein the swing lever is the developing roller gear. After being removed by withdrawing from the developing roller shaft, the fulcrum pin is withdrawn to be disassembled into the photoreceptor unit and the developing unit. And wherein the door.
また、 本発明に係る画像形成装置の構成は、 複数の像形成ユニットを 垂直面内で回転可能に支持するュニット回転体を備え、 前記複数の像形 成ュニットを順次像形成位置に移動させて画像形成を行う画像形成装置 であって、 前記像形成ュニットとして前記本発明の像形成ュニットを用 いることを特徴とする。 図面の簡単な説明 図 1は本発明の一実施の形態における画像形成装置を示す断面図であ り、 図 2は本発明の一実施の形態における像形成ュニットを示す外観斜 視図であり、 図 3は図 2の A— A断面図であり、 図 4は図 3中の現像口 ーラ周りの現像ュニット筐体とシール部材の構成を示す分解斜視図であ り、 図 5は図 2の右側面図 (カバ一を外した状態) であり、 図 6は図 2 の像形成ユニットの一部 (右側) を示した分斜視図 (カバーを外した状 態) であり、 図 7は本発明の一実施の形態における画像形成装置のキヤ リッジ及び感光体の位置決め機構と駆動機構とを示す分解斜視図 (カバ 一を外した状態) であり、 図 8は本発明の一実施の形態における画像形 成装置の像形成位置を通る面でキヤリッジを切断した断面図 (カバ一を 外した状態) であり、 図 9は本発明の一実施の形態における現像ュニッ トに設けられた揺動レバ一部を示す断面図であり、 図 1 0は図 2の左側 面図であり、 図 1 1は本発明の一実施の形態における感光体と現像口一 ラの駆動説明図である。 発明を実施するための最良の形態 Further, the configuration of the image forming apparatus according to the present invention includes a unit rotating body that rotatably supports a plurality of image forming units in a vertical plane, and sequentially moves the plurality of image forming units to an image forming position. An image forming apparatus for forming an image, wherein the image forming unit of the present invention is used as the image forming unit. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a cross-sectional view illustrating an image forming apparatus according to an embodiment of the present invention, FIG. 2 is an external perspective view illustrating an image forming unit according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view showing the configuration of a developing unit housing and a seal member around the developing roller in FIG. 3, and FIG. 5 is a right side view of FIG. 6 is a perspective view (with the cover removed) showing a part (right side) of the image forming unit in FIG. 2, and FIG. 7 is an embodiment of the present invention. FIG. 8 is an exploded perspective view (with a cover removed) showing a carriage and a photosensitive member positioning mechanism and a driving mechanism of the image forming apparatus according to the embodiment; FIG. 8 is an image forming apparatus according to an embodiment of the present invention; FIG. 5 is a cross-sectional view (with the cover removed) of a carriage cut along a plane passing through the image forming position of FIG. FIG. 9 is a cross-sectional view showing a part of a swing lever provided in the developing unit in one embodiment of the present invention, FIG. 10 is a left side view of FIG. 2, and FIG. FIG. 4 is an explanatory diagram of driving of a photoconductor and a developing port in one embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
以下、 実施の形態を用いて本発明をさらに具体的に説明する。  Hereinafter, the present invention will be described more specifically with reference to embodiments.
図 1は本発明の一実施の形態における画像形成装置を示す断面図、 図 FIG. 1 is a cross-sectional view illustrating an image forming apparatus according to an embodiment of the present invention.
2は本発明の一実施の形態における像形成ュニットを示す外観斜視図、 図 3は図 2の A— A断面図、 図 4は図 3中の現像ローラ周りの現像ュニ ット筐体とシール部材の構成を示す分解斜視図、 図 5は図 2の右側面図 (カバーを外した状態) 、 図 6は図 2の像形成ユニットの一部 (右側) を示した分斜視図 (カバ一を外した状態) である。 2 is an external perspective view showing an image forming unit according to one embodiment of the present invention, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is a diagram showing a developing unit housing around a developing roller in FIG. FIG. 5 is an exploded perspective view showing the structure of the sealing member, FIG. 5 is a right side view of FIG. 2 (with the cover removed), and FIG. 6 is a partial perspective view (cover) showing a part (right side) of the image forming unit in FIG. With one removed).
図 1において、 右側端面が装置前面であり、 装置本体 1のほぼ中央に キヤッリッジ 2、 前面に前面ァリゲ一夕 1 A、 天面に天面扉 1 7が設け られている。 図 1〜図 3中、 3 0は感光体、 3 4は感光体 3 0をマイナスに一様に 帯電するコロナ帯電器、 3 5は現像ローラ 3 1、 トナー供給用の供給口 ーラ 2 1 7、 シール部材 2 0 0、 トナー層形成用のドクターブレード 2 4、 トナー 3 2を収容するトナーホッパ 3 9を含む現像ュニットである, 尚、 図 2中、 2 0 4は後述する揺動レバー 9 2を含む揺動ギア 9 4等の ギア群を保護するためのカバーである。 In FIG. 1, the right end face is the front of the apparatus, and a carriage 2 is provided at substantially the center of the apparatus main body 1, a front door 1A is provided at the front, and a top door 17 is provided at the top. In FIGS. 1 to 3, reference numeral 30 denotes a photosensitive member, reference numeral 34 denotes a corona charger for uniformly charging the photosensitive member 30 in a negative direction, reference numeral 35 denotes a developing roller 31, and supply roller 21 for supplying toner. 7, a developing unit including a seal member 200, a doctor blade 24 for forming a toner layer, and a toner hopper 39 for storing the toner 32. In FIG. 2, 204 is a swing lever 9 described later. It is a cover for protecting a gear group such as a swing gear 94 including 2.
ここで、 図 3、 図 4に示すように、 現像ユニット 3 5の筐体には、 現 像ローラ 3 1と供給ローラ 2 1 7との間に位置して両者の接触を許容す る、 現像ローラ 3 1の長手方向に沿った略長方形状の開口部 2 0 2が設 けられており、 開口部 2 0 2の現像ローラ 3 1の長手方向に沿った一辺 側には受け部 2 0 1が設けられている。 この受け部 2 0 1には、 シール 部材 2 0 0の長手方向に沿った一側部が位置しており、 シール部材 2 0 0の長手方向に沿った他側部は開口部 2 0 2の現像ローラ 3 1の長手方 向に沿った他辺側の壁面に当接した状態で配置されている。  Here, as shown in FIG. 3 and FIG. 4, the housing of the developing unit 35 is located between the developing roller 31 and the supply roller 21 to allow the contact between them. A substantially rectangular opening 202 is provided along the longitudinal direction of the roller 31. A receiving portion 201 is provided on one side of the opening 202 along the longitudinal direction of the developing roller 31. Is provided. One side of the receiving portion 201 along the longitudinal direction of the seal member 200 is located, and the other side of the seal member 200 along the longitudinal direction is the opening portion 202. The developing roller 31 is arranged in contact with the wall surface on the other side along the longitudinal direction.
3 6は転写後の感光体 3 0の表面に残ったトナーを清掃するためのゴ ム製のクリーニンダブレード、 3 8はクリーニンダブレード 3 6によつ て搔き取られた廃トナーを収容する廃トナーケ一スであり、 これにコロ ナ帯電器 3 4及び感光体 3 0が取り付けられて感光体ュニット 3 7が構 成されている。 また、 感光体ュニット 3 7と現像ュニット 3 5とは支点 ピン 9 0によって揺動自在に連結されて一体化されており、 これにより 像形成ユニット 3が構成されている。 感光体 3 0、 現像ローラ 3 1、 供 給ローラ 2 1 7はそれぞれ回転自在に支持され、 それぞれ矢印の方向に 回転する。 トナー 3 2はポリエステル樹脂に顔料を分散したマイナス帯 電性のものであり、 供給口 2 5を通して供給ローラ 2 1 7から現像ロー ラ 3 1へと供給され、 ドクターブレード 2 4で薄層化された後、 感光体 3 0に供給されて、 感光体 3 0上の静電潜像を現像する。 キャリッジ 2には、 4色 (イェロー、 マゼン夕、 シアン、 ブラック) の像形成ユニット 3 Y、 3 M、 3 C、 3 B kが収容されている。 キヤリ ッジ 2は円管 2 1に回転可能に支持されており、 これにより各色の像形 成ュニット 3の感光体 3 0を像形成位置 1 0とその他の待避位置との間 で順次移動させて、 像形成ユニット 3の切り替えを行うことができる。 像形成ュニット 3のキャリッジ 2内での像形成動作位置は、 感光体 3 0に画素レーザ一信号光 8が照射され、 転写ベルトュニット 5と感光体 3 0とが接触する像形成位置 1 0のみである。 像形成ュニット 3は、 こ の像形成位置 1 0において装置本体 1の駆動源や電源と接続され、 これ により像形成動作が行われる。 その他の位置は待避位置であり、 この位 置ではどの像形成ュニット 3も動作しない。 Reference numeral 36 denotes a rubber-made cleaning blade for cleaning the toner remaining on the surface of the photoconductor 30 after transfer, and reference numeral 38 denotes a waste toner removed by the cleaning blade 36. A corona charger 34 and a photoreceptor 30 are attached to the waste toner case to form a photoreceptor unit 37. The photoreceptor unit 37 and the developing unit 35 are swingably connected and integrated by a fulcrum pin 90, thereby forming the image forming unit 3. The photoreceptor 30, the developing roller 31, and the supply roller 217 are each rotatably supported, and each rotate in the direction of the arrow. The toner 32 is a negatively charged toner in which a pigment is dispersed in a polyester resin. The toner 32 is supplied from a supply roller 21 to a developing roller 31 through a supply port 25, and is thinned by a doctor blade 24. After that, the electrostatic latent image is supplied to the photoconductor 30 to develop the electrostatic latent image on the photoconductor 30. The carriage 2 houses image forming units 3Y, 3M, 3C, and 3BK of four colors (yellow, magenta, cyan, and black). The carriage 2 is rotatably supported by the circular tube 21 so that the photoreceptor 30 of the image forming unit 3 of each color is sequentially moved between the image forming position 10 and other retreat positions. Thus, the image forming unit 3 can be switched. The image forming operation position of the image forming unit 3 in the carriage 2 is only at the image forming position 10 where the photoreceptor 30 is irradiated with the pixel laser one signal light 8 and the transfer belt unit 5 and the photoreceptor 30 contact. is there. The image forming unit 3 is connected to a drive source and a power supply of the apparatus main body 1 at the image forming position 10, thereby performing an image forming operation. The other positions are the retraction positions, in which no image forming unit 3 operates.
像形成ユニット 3は、 装置本体 1に着脱自在に装着されており、 像形 成ュニット 3の交換が必要な場合には、 キヤリッジ 2を回転させて交換 したい色の像形成ュニッ卜 3を天面扉 1 7の下方に位置させ、 天面扉 1 7を開いて交換することができる。  The image forming unit 3 is detachably mounted on the apparatus main body 1. When the image forming unit 3 needs to be replaced, the image forming unit 3 of the color to be replaced is rotated by rotating the carriage 2. It is located below the door 17 and can be replaced by opening the top door 17.
転写ベルトュニット 5は、 像形成位置 1 0において像形成ュニット 3 の感光体 3 0上に形成されたトナ一像を写し取り、 写し取ったトナー像 を記録用紙に再転写するためのものである。 転写ベルトュニット 5は、 中間転写ベルト 5 0と、 中間転写ベルト 5 0を懸架するプーリー群 (駆 動プーリ一 5 5 A、 ノ ックアツププーリ一 5 5 B、 ガイドプーリ一 5 5 C、 テンションプーリ 5 5 D ) と、 クリーナ 5 1と、 クリーニング後の 廃トナーを収容する廃トナーケース 5 7とにより構成されており、 これ らは一体化されて装置本体 1に着脱自在に装着されている。  The transfer belt unit 5 is for copying the toner image formed on the photoreceptor 30 of the image forming unit 3 at the image forming position 10 and retransferring the transferred toner image to recording paper. The transfer belt unit 5 is composed of an intermediate transfer belt 50 and a group of pulleys for suspending the intermediate transfer belt 50 (a driving pulley 55 A, a knock-up pulley 55 B, a guide pulley 55 C, a tension pulley 55 D) ), A cleaner 51, and a waste toner case 57 for storing the waste toner after cleaning, and these are integrated and detachably attached to the apparatus main body 1.
中間転写ベルト 5 0は、 厚さ約 1 0 0 mのエンドレスベルト状の半 導電性 (中抵抗) のウレタンに P F Aや P T F E等のフッ素樹脂をコ一 ティングして、 全体の厚さを 1 0 0〜 3 0 0 mとしたフィルムからな る。 中間転写ベルト 5 0の周長は、 A 4サイズあるいはレターサイズを フルカラープリントするために、 最大受像紙サイズである A 4受像紙の 長手方向の長さ (2 9 7 mm) よりも若干長い長さに設定されている。 クリーナ 5 1は、 中間転写ベルト 5 0に残留したトナーを清掃除去す るためのものであり、 ゴム製のクリーニングブレード 5 3と搔き取った トナーを廃トナーケース 5 7に搬送するためのスクリュウ 5 2とにより 構成されている。 このクリーナ 5 1は、 中間転写ベルト 5 0上にカラー 像を形成している間に中間転写ベルト 5 0上のトナー像を削り落とさな いようにするために、 支点 5 8を中心として回動して中間転写ベルト 5 0から離れる構成となっている。 The intermediate transfer belt 50 is formed by coating a fluororesin such as PFA or PTFE on semi-conductive (medium resistance) urethane in the form of an endless belt having a thickness of about 100 m to reduce the overall thickness to 100 m. From a film of 0 to 300 m You. The perimeter of the intermediate transfer belt 50 is slightly longer than the maximum length of A4 receiving paper (297 mm), which is the maximum receiving paper size, for full-color printing of A4 or letter sizes. Is set to The cleaner 51 is for cleaning and removing the toner remaining on the intermediate transfer belt 50, and is a screw for conveying the removed toner to the waste toner case 57 with the rubber cleaning blade 53. 5 and 2. The cleaner 51 rotates about a fulcrum 58 in order to prevent the toner image on the intermediate transfer belt 50 from being scraped off while a color image is being formed on the intermediate transfer belt 50. And is separated from the intermediate transfer belt 50.
中間転写ベルト 5 0を懸架するプーリ一群のうち、 プーリ一 5 5 Aは 中間転写ベルト 5 0を駆動する駆動プ一リーであり、 クリーニングブレ —ド 5 3のバックアップをも兼ねている。 プーリー 5 5 Bは中間転写べ ルト 5 0上のトナー像を記録用紙に転写する 2次転写ローラ 9のバック アッププーリ一である。 プーリー 5 5 Cはガイドプ一リーであり、 感光 体 3 0から中間転写ベルト 5 0上にトナー像を転写するための 1次転写 バイアスを印加する口一ラをも兼ねている。 プーリー 5 5 Dは中間転写 ベルト 5 0にテンションを与えるテンションプ一リである。 中間転写べ ルト 5 0はこれらのプ一リー 5 5 A、 5 5 B、 5 5 C、 5 5 Dに懸架さ れており、 駆動プーリ一 5 5 Aの回転によって回転駆動することができ る。 尚、 5 6は中間転写ベルト 5 0を保護するためのカバーである。 転写ベルトュニット 5は、 装置本体 1に装着された時に所定の位置に 確実に位置決めされ、 像形成位置 1 0に対面する部分が像形成ュニット 3の感光体 3 0にに接触する。 また、 同時に、 転写ベルトユニット 5の 各部が本体側と電気的に接続されると共に、 駆動プーリー 5 5 Aが本体 側の駆動手段に連結されて、 中間転写ベルト 5 0が回転可能な状態とな る。 Among a group of pulleys that suspend the intermediate transfer belt 50, a pulley 55 A is a drive pulley for driving the intermediate transfer belt 50, and also serves as a backup for the cleaning blade 53. The pulley 55B is a backup pulley of the secondary transfer roller 9 for transferring the toner image on the intermediate transfer belt 50 to recording paper. The pulley 55C is a guide pulley, and also serves as a porter for applying a primary transfer bias for transferring a toner image from the photoconductor 30 onto the intermediate transfer belt 50. The pulley 55D is a tension pulley that applies tension to the intermediate transfer belt 50. The intermediate transfer belt 50 is suspended around these pulleys 55A, 55B, 55C and 55D, and can be driven to rotate by the rotation of the drive pulley 55A. . Reference numeral 56 denotes a cover for protecting the intermediate transfer belt 50. The transfer belt unit 5 is reliably positioned at a predetermined position when the transfer belt unit 5 is mounted on the apparatus main body 1, and a portion facing the image forming position 10 comes into contact with the photoconductor 30 of the image forming unit 3. At the same time, each part of the transfer belt unit 5 is electrically connected to the main body side, and the driving pulley 55A is connected to the driving means on the main body side, so that the intermediate transfer belt 50 becomes rotatable. You.
尚、 除電針 7は、 記録用紙が中間転写ベルト 5 0から分離する時にト ナー像が乱れないようにするためのものである。  The static elimination needle 7 is for preventing the toner image from being disturbed when the recording paper is separated from the intermediate transfer belt 50.
6は転写ベルトュニット 5の下方に配置されたレーザー露光装置であ り、 このレーザー露光装置 6は、 半導体レーザー (図示せず) 、 ポリゴ ンミラー 6 A、 レンズ系 6 B、 第 1ミラー 6 C等により構成されている, 画像情報の時系列電気画素信号に対応した画素レーザー信号光 8は、 図 1のイェローの像形成ュニット 3 Yの感光体ュニット 3 7とブラックの 像形成ュニット 3 B kの現像ュニット 3 5との間に形成された光路 2 2 を通過する。 画素レーザー信号光 8は、 円管 2 1の露光窓 9 7を通り、 円管 2 1内の装置本体 1に固定された第 2ミラ一 9 8 (円管 2 1とは無 関係に静止している) に入射し、 反射されて像形成ユニット 3 Yの感光 体ュニット 3 7と現像ュニット 3 5との間に設けられた隙間 3 3を通つ て像形成位置 1 0に位置する感光体 3 0の左側面の露光部に入射し、 感 光体 3 0を母線方向に走査露光する。  Reference numeral 6 denotes a laser exposure device disposed below the transfer belt unit 5, and the laser exposure device 6 includes a semiconductor laser (not shown), a polygon mirror 6A, a lens system 6B, a first mirror 6C, and the like. The pixel laser signal light 8 corresponding to the time-series electrical pixel signals of the image information is composed of the yellow image forming unit 3 Y photoreceptor unit 37 and the black image forming unit 3 B k in FIG. It passes through an optical path 22 formed between the unit 35 and the unit 35. The pixel laser signal light 8 passes through the exposure window 97 of the tube 21 and the second mirror 98 fixed to the apparatus body 1 in the tube 21 (still stands irrespective of the tube 21). ), Is reflected and passes through a gap 33 provided between the photosensitive unit 37 of the image forming unit 3Y and the developing unit 35, and is located at the image forming position 10 The light is incident on an exposure portion on the left side surface of the substrate 30, and the photosensitive body 30 is scanned and exposed in the generatrix direction.
1 2は給紙ユニット、 1 4は給紙口一ラ、 1 6はレジストロ一ラ、 1 8は排紙ローラ、 1 3 a、 1 3 b , 1 3 c、 1 3 dはこれらの口一ラ間 と中間転写ベルト 5 0と 2次転写ローラ 9の接触点と定着器 1 5との間 を結ぶ紙ガイドである。  1 2 is a paper feed unit, 14 is a paper feed port, 16 is a registration roller, 18 is a paper discharge roller, 13 a, 13 b, 13 c, and 13 d are these ports. This is a paper guide that connects between the rollers and the contact point between the intermediate transfer belt 50 and the secondary transfer roller 9 and the fixing device 15.
前面ァリゲ一夕 1 Aは、 装置本体 1にヒンジ軸 1 Bによって蝶合され ており、 前面へ倒して開くことができる。 前面ァリゲ一夕 1 Aには、 定 着器 1 5、 2次転写ローラ 9、 除電針 7、 紙ガイド 1 3 a、 1 3 b、 1 3 c、 1 3 dの前面側及びレジストロ一ラ 1 6の前面側が取り付けられ ており、 前面ァリゲ一タ 1 Aを前方に倒すと、 これらの構成物も同時に 倒れる。 このため、 装置本体 1の前面を大きく解放することが可能であ り、 この部分から転写ベルトュニット 5を着脱することができると共に 紙詰まり時にも記録用紙を容易に除去することができる。 The front door 1A is hinged to the device main body 1 by a hinge shaft 1B, and can be opened by leaning to the front. On the front side, 1A, a settler 15, secondary transfer roller 9, static elimination needle 7, paper guide 13 a, 13 b, 13 c, 13 d Front side and registration roller 1 The front side of 6 is attached, and when the front trigger 1A is moved forward, these components also fall at the same time. For this reason, the front surface of the apparatus main body 1 can be largely released, and the transfer belt unit 5 can be attached and detached from this portion, and The recording paper can be easily removed even when the paper is jammed.
次に、 各色の色合わせを正確に行うための像形成位置 1 0における感 光体 3 0の位置決めと駆動機構の詳細について、 図 7、 図 8を用いて説 明する。  Next, the details of the positioning and driving mechanism of the photosensitive element 30 at the image forming position 10 for accurately performing color matching of each color will be described with reference to FIGS.
' 図 7は本発明の一実施の形態における画像形成装置のキヤリッジ及び 感光体の位置決め機構と駆動機構とを示す分解斜視図 (カバーを外した 状態) 、 図 8は本発明の一実施の形態における画像形成装置の像形成位 置を通る面でキャリッジを切断した断面図 (カバーを外した状態) であ る。 FIG. 7 is an exploded perspective view (with a cover removed) showing a carriage and a photoconductor positioning mechanism and a drive mechanism of the image forming apparatus according to an embodiment of the present invention, and FIG. 8 is an embodiment of the present invention. FIG. 2 is a cross-sectional view (with a cover removed) of the carriage taken along a plane passing through an image forming position of the image forming apparatus in FIG.
図 7、 図 8に示すように、 感光体 3 0の両端には、 像形成ユニット 3 の位置決め用のテ一パ穴 4 8 R、 4 8 Lを有するフランジ 4 1 R、 4 1 Lが接着固定されており、 このフランジ 4 1 R、 4 1 Lの外周が感光体 ュニット 3 7の側壁に固定された感光体軸受け 4 3 R、 4 3 Lに回転自 在に取り付けられている。 フランジ 4 1 Rの先端には感光体 3 0を回転 駆動するためのカップリング爪部 4 7が設けられており、 このカツプリ ング爪部 4 7は本体側のカップリング板 6 1と係合可能となっている。 キャリッジ 2の中央の円管 2 1には、 右側壁 2 0 Rと左側壁 2 0 Lと が固定されている。 この両側壁 2 0 R、 2 0 Lには、 キャリッジ 2の内 部を 4分割するようにそれぞれ 4箇所に仕切りリブ 2 3が固定配置され ており、 仕切りリブ 2 3によって仕切られたキャリッジ 2内の各空間に 各色の像形成ユニット 3が配置される。 また、 円管 2 1には、 感光体露 光用の画素レーザー信号光 8が通過する位置の合計 4箇所に露光窓 9 7 が設けられている。 尚、 キャリッジ 2は、 左右の本体側壁 1 R、 1 Lに 軸受け 4 6 R、 4 6 Lを介して回転可能に支持されている。  As shown in FIGS. 7 and 8, flanges 41 R and 41 L having taper holes 48 R and 48 L for positioning the image forming unit 3 are adhered to both ends of the photoconductor 30. The outer circumferences of the flanges 41 R and 41 L are rotatably attached to photoconductor bearings 43 R and 43 L fixed to the side wall of the photoconductor unit 37. At the end of the flange 4 1 R, a coupling claw portion 47 for rotating and driving the photoconductor 30 is provided. The coupling claw portion 47 can be engaged with the coupling plate 61 on the main body side. It has become. A right side wall 20 R and a left side wall 20 L are fixed to the center circular tube 21 of the carriage 2. On both side walls 20 R and 20 L, partition ribs 23 are fixedly arranged at four places so as to divide the inner part of the carriage 2 into four parts, and the inside of the carriage 2 divided by the partition ribs 23 is provided. An image forming unit 3 of each color is arranged in each space of. Further, the circular tube 21 is provided with exposure windows 97 at a total of four positions through which the pixel laser signal light 8 for exposing the photoconductor passes. The carriage 2 is rotatably supported on left and right main body side walls 1 R, 1 L via bearings 46 R, 46 L.
左側壁 2 0 Lの外側にはキャリッジギア 2 8がー体成形されており、 キャリッジギア 2 8は本体側に設けられたキヤリッジ駆動機構 8 6と連 結されている。 キャリッジ駆動機構 8 6は駆動源 (図示せず) に連結さ れたウォーム 8 9と、 ウォームホイール 8 8と、 ウォームホイール 8 8 と一体化され、 キヤリッジギア 2 8と嚙み合うギア 8 7とにより構成さ れており、 このキャリッジ駆動機構 8 6の回転駆動により、 キャリッジ 2は自在に回転位置決めされる。 A carriage gear 28 is formed on the outside of the left side wall 20 L. The carriage gear 28 is connected to a carriage driving mechanism 86 provided on the main body side. Is tied. The carriage drive mechanism 86 includes a worm 89 connected to a drive source (not shown), a worm wheel 88, and a gear 87 integrated with the worm wheel 88 and engaged with the carriage gear 28. The carriage 2 is freely rotated and positioned by the rotation of the carriage drive mechanism 86.
4 5 R、 4 5 Lは左右の本体側壁 1 R、 1 Lに固定され、 キャリッジ 2の外周に沿つて下半分程度に設けられた像形成ュニット 3がキャリッ ジ 2から落下するのを防止するための落下防止ガイドである。  45 R, 45 L are fixed to the left and right main body side walls 1 R, 1 L, and prevent the image forming unit 3 provided in the lower half along the outer periphery of the carriage 2 from dropping from the carriage 2. It is a fall prevention guide for.
尚、 第 2ミラ一 9 8は、 円管 2 1のほぼ中央付近に図示しない固定部 材によって本体側壁 1 R、 1 Lに強固に取り付けられており、 キヤリツ ジ 2の回転とは無関係に常時静止状態を保つ構成となっている。  The second mirror 198 is firmly attached to the main body side walls 1R and 1L by a fixing member (not shown) substantially in the vicinity of the center of the circular tube 21 and is always irrespective of the rotation of the carriage 2. It is configured to keep the stationary state.
側壁 2 0 R、 2 0 Lには、 像形成ユニット 3のフランジ 4 1 R、 4 1 Lが挿入される部分に切欠き 2 6 R、 2 6 Lが設けられている。 この切 り欠き 2 6 R、 2 6 Lと仕切リブ 2 3は、 像形成ユニット 3をキヤリツ ジ 2内に装着するときのガイドとしての役目を果たす。 キャリッジ 2の 側方ないし下方においては、 像形成ュニット 3は落下防止ガイド 4 5 R 4 5 Lにガイドされ、 キャリッジ 2から離脱することはない。  The side walls 20R and 20L are provided with cutouts 26R and 26L at portions where the flanges 41R and 41L of the image forming unit 3 are inserted. The notches 26 R, 26 L and the partition ribs 23 serve as guides when the image forming unit 3 is mounted in the carriage 2. At the side or below the carriage 2, the image forming unit 3 is guided by the fall prevention guide 45 R 45 L and does not separate from the carriage 2.
この切欠き 2 6 R、 2 6 Lの寸法はフランジ 4 1 R、 4 1 Lの外径よ りも大きく設定されており、 感光体 3 0が像形成位置 1 0で位置決めさ れて基準位置にあるとき、 感光体 3 0を正規の位置にあるキャリッジ 2 に対して全方向に遊びを持たせた構成となっている。 本実施の形態にお いては、 この遊びは約 l mm確保されており、 これによりキャリッジ 2 の位置決め精度が多少悪くても感光体 3 0の位置決め動作を妨げること がないようにされている。  The dimensions of the notches 26 R and 26 L are set larger than the outer diameters of the flanges 41 R and 41 L, and the photoconductor 30 is positioned at the image forming position 10 and the reference position. , The photoconductor 30 is provided with play in all directions with respect to the carriage 2 at the regular position. In the present embodiment, this play is ensured at about l mm, so that the positioning operation of the photoconductor 30 is not hindered even if the positioning accuracy of the carriage 2 is somewhat poor.
装置本体 1の両側壁 1 R、 1 Lには、 感光体 3 0を像形成位置 1 0に 正確に位置決めするために、 それぞれ感光体駆動機構 6 0 機構 8 0が設けられている。 The photoreceptor drive mechanism 60 is provided on each side wall 1R, 1L of the apparatus main body 1 to accurately position the photoreceptor 30 at the image forming position 10. A mechanism 80 is provided.
感光体駆動機構 6 0は右本体側壁 1 Rに設けられており、 出力軸 7 0 と、 出力軸 7 0に固定され出力軸 7 0と一体的に回転するカツプリング 板 6 1と、 出力軸駆動ギア 7 1と、 これらを駆動する駆動機構とにより 構成されている。 出力軸 7 0は、 右本体側壁 1 Rとこれに固定された基 板 6 7との間でそれぞれに固定された軸受け 7 7にスラスト方向に移動 可能かつ回転可能に支持されている。  The photoconductor drive mechanism 60 is provided on the right main body side wall 1R, and includes an output shaft 70, a coupling plate 61 fixed to the output shaft 70 and rotating integrally with the output shaft 70, and an output shaft drive. It comprises a gear 71 and a drive mechanism for driving these. The output shaft 70 is movably and rotatably supported in a thrust direction between bearings 77 fixed between the right main body side wall 1R and the base plate 67 fixed thereto.
出力軸 7 0の一端には、 感光体 3 0のテ一パ穴 4 8 Rに倣う凸状のテ —パ面を有する先端テーパ部 7 5が形成されており、 出力軸 7 0の他端 は、 スラスト軸受け 6 9 Rに小さい面積で接触するように球面状に形成 されている。 出力軸駆動ギア 7 1はハスバ歯車であり、 この出力軸駆動 ギア 7 1は原動側ギア 7 2と嚙み合った状態で出力軸 7 0に固定されて いる。 7 4は軸受け 7 7と出力軸駆動ギア 7 1との間に挿入された圧縮 バネであり、 この圧縮バネ 7 は、 出力軸 7 0及び力ップリング板 6 1 を感光体 3 0側のフランジ 4 1 Rから離間した位置 (図 7は係合した位 置を示す) に常時付勢しておくためのものである。  One end of the output shaft 70 is formed with a tapered tip portion 75 having a convex tapered surface following the tapered hole 48R of the photoconductor 30, and the other end of the output shaft 70 is provided. Is formed in a spherical shape so as to contact the thrust bearing 69 R with a small area. The output shaft drive gear 71 is a helical gear, and the output shaft drive gear 71 is fixed to the output shaft 70 so as to mesh with the driving gear 72. Reference numeral 4 denotes a compression spring inserted between the bearing 7 7 and the output shaft driving gear 7 1. The compression spring 7 connects the output shaft 7 and the force coupling plate 6 1 to the photoreceptor 3 side flange 4. This is for always energizing to a position away from 1R (Figure 7 shows the engaged position).
出力軸 7 0は、 スラスト軸受け 6 9 Rを動かす駆動手段 (図示せず) により、 フランジ 4 1 Rから離間した位置と、 図 7に示すテーパ穴 4 8 Rと先端テーパ部 7 5とが係合する係合位置との間をパネ力に抗して移 動可能であるが、 いずれの位置においても出力軸駆動ギア 7 1が原動側 ギア 7 2に嚙み合った状態となるように原動側ギア 7 2は広い歯幅を有 している。 出力軸 7 0がスラスト方向に移動するとき、 出力軸駆動ギア 7 1と原動側ギア 7 2は互いの歯面で滑りながら移動する。  The output shaft 70 is driven by a driving means (not shown) for moving the thrust bearing 69 R, so that the position separated from the flange 41 R, the tapered hole 48 R shown in FIG. Can be moved against the mating engagement position against the panel force, but in any position, the output shaft drive gear 71 is driven so that it engages with the drive side gear 72. The side gear 72 has a wide tooth width. When the output shaft 70 moves in the thrust direction, the output shaft drive gear 71 and the driving gear 72 move while sliding on each other's tooth surfaces.
力ップリング板 6 1は、 フランジ 4 1 Rのカツプリング爪部 4 7と嚙 み合って動力を伝達するためのものであり、 先端に 8枚のカップリング 爪 6 5を有している。 次に、 左本体側壁 1 Lに設けられたディテント機構 8 0について説明 する。 The force coupling plate 61 is used for transmitting power by engaging with the coupling claw portion 47 of the flange 41 R, and has eight coupling claws 65 at its tip. Next, the detent mechanism 80 provided on the left main body side wall 1L will be described.
ディテント機構 8 0は、 左本体側壁 1 Lと基板 6 8との間に軸受け 7 8を介して支持され、 スラスト軸受け 6 9 Lを動かす駆動機構 (図示せ ず) と圧縮パネ 8 5とによってスラスト方向に移動可能かつ回転可能な ディテント軸 8 1によって構成されている。 ディテント軸 8 1の一端に は、 フランジ 4 1 Lのテーパ穴 4 8 Lに倣うテ一パ面 8 4が形成されて おり、 ディテント軸 8 1の他端は、 出力軸 7 0と同様に球面状に形成さ れてスラスト軸受 6 9 Lに押し当てられている。 8 5は左本体側壁 1 L とディテント軸 8 1に固定されたパネ止め 8 2との間に揷入された圧縮 バネであり、 この圧縮パネ 8 5は、 ディテン卜軸 8 1を常時フランジ 4 1 Lから離間しておくためのものである。  The detent mechanism 80 is supported through a bearing 78 between the left main body side wall 1 L and the substrate 68, and is driven by a drive mechanism (not shown) for moving the thrust bearing 69 L and a compression panel 85. It is constituted by a detent shaft 81 that can move and rotate in the direction. One end of the detent shaft 81 is formed with a tapered surface 84 following the tapered hole 48 L of the flange 41 L, and the other end of the detent shaft 81 is spherical, like the output shaft 70. And pressed against 69 L of thrust bearing. Reference numeral 8 5 denotes a compression spring inserted between the left side wall 1 L of the left main body and the panel stop 8 2 fixed to the detent shaft 8 1. It is for keeping away from 1 L.
以上の構成により、 出力軸 7 0及びディテント軸 8 1が感光体 3 0の フランジ 4 1 R、 4 1 Lから離間した状態でキャリッジ 2に支持された 像形成ユニット 3が像形成位置に運ばれて停止すると、 スラスト軸受け 6 9 R、 6 9 Lが駆動機構によってそれぞれ内側に押されて、 出力軸 7 0の先端テーパ部 7 5がフランジ 4 1 Rのテーパ穴 4 8 に、 ディテン ト軸 8 1のテーパ面 8 4がフランジ 4 1 Lのテーパ穴 4 8 Lにそれぞれ 係合し、 感光体 3 0は像形成位置 1 0に正確に位置決めされる。 出力軸 7 0とディテント軸 8 1が内側に押圧された状態で出力軸駆動ギア 7 1 が回転すると、 力ップリング板 6 1のカツプリング爪 6 5がフランジ 4 1 Rの力ップリング爪部 4 7に係合しているため、 出力軸 7 0の回転が 感光体 3 0に伝達され、 感光体 3 0が像形成位置 1 0で回転する。 この とき、 出力軸 7 0とディテント軸 8 1に支持された感光体 3 0、 第 2ミ ラ一9 8及びレーザー露光装置 6はすべて装置本体 1に位置決めされて いるため、 キヤリッジ 2の位置と無関係に感光体 3 0を正確に位置決め することができる。 その結果、 色の切替を行ってもこの関係がずれるこ とはないので、 色ずれが発生することはない。 With the above configuration, the image forming unit 3 supported by the carriage 2 is carried to the image forming position with the output shaft 70 and the detent shaft 81 separated from the flanges 41 R and 41 L of the photoconductor 30. When it stops, the thrust bearings 69 R and 69 L are pushed inward by the drive mechanism, and the tapered end 75 of the output shaft 70 is inserted into the tapered hole 48 of the flange 41 R and the detent shaft 8 The 1 tapered surface 84 is engaged with the tapered hole 48 L of the flange 41 L, and the photoconductor 30 is accurately positioned at the image forming position 10. When the output shaft drive gear 7 1 rotates with the output shaft 70 and the detent shaft 8 1 pressed inward, the coupling pawl 6 5 of the force coupling plate 6 1 engages the force coupling claw 4 7 of the flange 4 1 R. Because of the engagement, the rotation of the output shaft 70 is transmitted to the photoconductor 30, and the photoconductor 30 rotates at the image forming position 10. At this time, the photoconductor 30, the second mirror 98, and the laser exposure device 6 supported on the output shaft 70 and the detent shaft 81 are all positioned on the device main body 1. Accurately position photoconductor 30 regardless of can do. As a result, even if the color is switched, this relationship does not shift, and no color shift occurs.
次に、 本実施の形態における像形成ュニット 3の構成及び現像ローラ の駆動機構について、 図 3〜図 6及び図 8〜図 1 0を用いて詳細に説明 する。  Next, the configuration of the image forming unit 3 and the driving mechanism of the developing roller in the present embodiment will be described in detail with reference to FIGS. 3 to 6 and FIGS.
図 9は本発明の一実施の形態における現像ュニットに設けられた揺動 レバ一部を示す断面図、 図 1 0は図 2の左側面図である。  FIG. 9 is a cross-sectional view showing a part of a swing lever provided in the developing unit according to one embodiment of the present invention, and FIG. 10 is a left side view of FIG.
まず、 像形成ュニット 3における感光体ュニット 3 7と現像ュニット 3 5の結合の仕方について説明する。  First, a method of connecting the photoconductor unit 37 and the developing unit 35 in the image forming unit 3 will be described.
図 3、 図 6、 図 8、 図 1 0に示すように、 感光体ュニット 3 7の右側 壁 3 7 Rには、 ピン揷通孔が形成された円筒状突起部 9 1が設けられて いる。 一方、 現像ュニット 3 5の右側壁 3 5 Rには位置決め孔 1 1 6力 形成されている。 また、 感光体ユニット 3 7の左側壁 3 7 Lには、 現像 口一ラ 3 1を感光体 3 0の方向にガイドするガイド溝 1 1 5が形成され ている。 現像ユニット 3 5の両側壁 3 5 R、 3 5 Lは感光体ユニット 3 7の両側壁 3 7 R、 3 7 Lの内側に配置される。 この場合、 感光体ュニ ット 3 7の右側壁 3 7 Rに設けられた突起部 9 1のピン揷通孔と現像ュ ニット 3 5の右側壁 3 5 Rに設けられた位置決め孔 1 1 6との位置合わ せが行われ、 感光体ュニット 3 7の右側壁 3 7 Rの外側から突起部 9 1 のピン揷通孔と位置決め孔 1 1 6とにわたって支点ピン 9 0が揷入され て、 感光体ュニット 3 7の右側壁 3 7 Rと現像ュニット 3 5の右側壁 3 5 Rとが連結される。  As shown in FIGS. 3, 6, 8, and 10, the right side wall 37R of the photoreceptor unit 37 is provided with a cylindrical projection 91 having a pin through hole. . On the other hand, a positioning hole 1 16 force is formed in the right side wall 35 R of the developing unit 35. The left side wall 37 L of the photoreceptor unit 37 has a guide groove 115 for guiding the developer port 31 in the direction of the photoreceptor 30. The side walls 35 R, 35 L of the developing unit 35 are disposed inside the side walls 37 R, 37 L of the photoconductor unit 37. In this case, the pin holes of the projections 91 provided on the right side wall 37 R of the photoreceptor unit 37 and the positioning holes provided on the right side wall 35 R of the developing unit 35 1 1 6 and the fulcrum pin 90 is inserted from the outside of the right side wall 37R of the photoreceptor unit 37 to the pin hole of the protrusion 91 and the positioning hole 116. The right side wall 37R of the photoreceptor unit 37 and the right side wall 35R of the developing unit 35 are connected.
図 3〜図 6及び図 8〜図 1 0に示すように、 現像ローラ 3 1は、 現像 ュニット 3 5の右側壁 3 5 Rと左側壁 3 5 Lにそれぞれ固定された軸受 け 1 0 5、 1 0 6に回転自在に支持されている。 軸受け 1 0 6は感光体 ュニット 3 7の左側壁 3 7 L側のガイド溝 1 1 5に嵌め込まれており、 現像ュニット 3 5の左側は感光体ュニット 3 7に対して現像ュニット 3 5ごとガイド溝 1 1 5に沿って動くことができる。 尚、 現像ユニット 3 5の左側壁 3 5 Lに設けられた孔 1 0 7にはガイドビン 1 0 8が揷入さ れているが、 これによつて両者の位置決めが行われるものではなく、 両 者は l mm程度の遊びをもって配置されている。 As shown in FIG. 3 to FIG. 6 and FIG. 8 to FIG. 10, the developing roller 31 is a bearing 105 fixed to the right side wall 35 R and the left side wall 35 L of the developing unit 35, respectively. It is rotatably supported at 106. The bearing 106 is fitted into the guide groove 1 15 on the left side wall 37 L of the photoconductor unit 37. The left side of the developing unit 35 can move along the guide groove 115 along with the developing unit 35 with respect to the photoconductor unit 37. A guide bin 108 is inserted into a hole 107 provided in the left side wall 35 L of the developing unit 35, but this does not determine the positions of both. Both are arranged with a play of about l mm.
感光体ュニット 3 7と現像ュニット 3 5は以上のような構成で組み合 わされ、 感光体ュニット 3 7の右側壁 3 7 Rと現像ュニット 3 5の右側 壁 3 5 Rは、 両者間にかけられた圧縮パネ 1 0 2によって支点ピン 9 0 を中心に回動し、 これにより現像ローラ 3 1が感光体 3 0に押圧された 状態で止まる。 また、 感光体ユニット 3 7の左側壁 3 7 Lと現像ュニッ ト 3 5の左側壁 3 5 Lは、 現像ローラ 3 1の軸受け 1 0 6と感光体ュニ ット 3 7の左側壁 3 7 Lに立てられたピン 1 1 1との間に掛け渡された 引っ張りコイルパネ 1 1 0によって現像ローラ 3 1が感光体 3 0側に引 き付けられ、 これにより現像口一ラ 3 1が感光体 3 0に押圧された状態 で止まる。  The photoreceptor unit 37 and the developing unit 35 are combined in the above configuration, and the right side wall 37R of the photoreceptor unit 37 and the right side wall 35R of the developing unit 35 are hung between them. The developing panel 31 is rotated about the fulcrum pin 90 by the compression panel 102, thereby stopping the developing roller 31 while being pressed against the photoconductor 30. The left side wall 37 L of the photoconductor unit 37 and the left side wall 35 L of the developing unit 35 are formed by the bearing 106 of the developing roller 31 and the left side wall 37 of the photoconductor unit 37. The developing roller 31 is attracted to the photoconductor 30 side by the tension coil panel 110, which is stretched between the pin 111 and the pin 111, and thereby the developing port roller 31 is moved to the photoconductor. Stops when pressed to 30.
次に、 現像ローラ 3 1の駆動機構について説明する。  Next, a drive mechanism of the developing roller 31 will be described.
図 5、 図 6、 図 8、 図 1 0に示すように、 現像ローラ 3 1は、 本体側 壁 1に取り付けられた現像駆動本体ギア 6 2、 揺動ギア 9 4、 現像口一 ラ 3 1に固定された現像ローラギア 9 6を介して回転駆動される。 現像 駆動本体ギア 6 2は、 '右本体側壁 1 Rと基板 6 7に軸受け 6 6を介して 回転自在に取り付けられた現像駆動軸 6 3に固定されており、 現像駆動 軸 6 3はこの現像駆動軸 6 3に固定された現像駆動プーリ一 6 4を介し て本体側から回転される。 尚、 ギア 9 9は供給ローラ 2 1 7に固定され たギアであり、 このギア 9 9は現像ローラギア 9 6及びアイドラーギア 2 1 4を介して回転駆動される。  As shown in FIG. 5, FIG. 6, FIG. 8, and FIG. 10, the developing roller 31 is composed of a developing drive main body gear 62 attached to the main body side wall 1, a swing gear 94, and a developing opening roller 3 1. Is driven to rotate via a developing roller gear 96 fixed to the roller. The development drive body gear 62 is fixed to a development drive shaft 63 rotatably mounted on the right body side wall 1R and the substrate 67 via a bearing 66, and the development drive shaft 63 is used for the development drive shaft 63. The developer is rotated from the main body via a developing drive pulley 164 fixed to the drive shaft 63. The gear 9.9 is a gear fixed to the supply roller 217, and is driven to rotate via a developing roller gear 96 and an idler gear 214.
図 5、 図 6、 図 9に示すように、 揺動ギア 9 4は、 現像ュニット 3 5 の右側壁 3 5 Rに固定された軸受け 1 0 5と現像ローラ軸 2 1 5に現像 ローラ軸 2 1 5を中心に揺動自在に取り付けられた揺動レバー 9 2にピ ン 9 3を介して回転自在に取り付けられている。 揺動レバー 9 2には引 つ張りパネ 1 0 4が掛けられ、 これにより揺動ギア 9 4は現像駆動本体 ギア 6 2側に付勢されるが、 揺動レバー 9 2の底面が感光体ユニット 3 7の右側壁 3 7 Rの支点ピン 9 0の周りの円形突起部 9 1に当接するこ とによって止まっている。 As shown in FIG. 5, FIG. 6, and FIG. 9, the swing gear 94 Through a pin 93 to a swing lever 92, which is attached to the bearing 105 fixed to the right side wall 35R and the developing roller shaft 215 around the developing roller shaft 215. It is attached rotatably. A tension panel 104 is hung on the swing lever 92 to thereby urge the swing gear 94 toward the developing drive main body gear 62, but the bottom surface of the swing lever 92 is a photoconductor. The unit 37 is stopped by abutting on the circular projection 91 around the fulcrum pin 90 of the right side wall 37R of the unit 37.
像形成ュニット 3が装着されたキヤリッジ 2が回転駆動するとき、 現 像駆動本体ギア 6 2と揺動ギア 9 4の歯の先端同士が当たると、 揺動レ バー 9 2が引っ張りパネ 1 0 4の力に坊して回動し、 揺動ギア 9 4が現 像駆動本体ギア 6 2から逃げる。 像形成ュニット 3が像形成位置 1 0に 来ると、 揺動ギア 9 4が現像駆動本体ギア 6 2に食い込んでくるが、 揺 動レバ一 9 2が円形突起部 9 1に当接して止められるので、 揺動ギア 9 4と現像駆動本体ギア 6 2の中心間距離は正しく確保され、 現像ローラ 3 1が感光体 3 0に接触した状態で回転する。  When the carriage 2 on which the image forming unit 3 is mounted is driven to rotate, if the tips of the teeth of the image drive main body gear 6 2 and the rocking gear 94 come into contact with each other, the rocking lever 92 pulls the panel 110 4. The rocking gear 94 rotates away from the image drive main body gear 62. When the image forming unit 3 reaches the image forming position 10, the swing gear 94 digs into the developing drive main body gear 62, but the swing lever 92 contacts the circular projection 91 to be stopped. Therefore, the center distance between the swing gear 94 and the developing drive main body gear 62 is properly secured, and the developing roller 31 is rotated in contact with the photosensitive member 30.
次に、 感光体 3 0と現像ローラ 3 1を安定的に駆動する駆動原理につ いて、 図 1 1を用いて詳細に説明する。  Next, the driving principle for stably driving the photoconductor 30 and the developing roller 31 will be described in detail with reference to FIG.
図 1 1は感光体 3 0、 現像ローラ 3 1を駆動する主要部分のみを抜き 出して説明するための図である。  FIG. 11 is a view for explaining only a main part for driving the photoconductor 30 and the developing roller 31.
図 1 1において、 9 6は現像ローラギア、 9 4は揺動ギア、 6 2は現 像駆動本体ギア、 2 0 Rはキヤリッジ 2の右側壁の内側に突出した部分 である。 9 0は現像ュニット 3 5と感光体ュニット 3 7を連結する支点 ピン、 9 1は感光体ュニット 3 7の右側壁 3 7 Rに設けられた円形突起 部である。 円形突起部 9 1及び揺動ギア 9 4はキヤリッジ 2の右側壁 2 0 Rの切り欠き部 2 9に落ち込んでおり、 揺動ギア 9 4は現像駆動本体 ギア 6 2と嚙み合っている。 このため、 像形成ユニット 3が感光体 3 0 を中心に首を振ると、 円形突起部 9 1が切り欠き部 2 9の側面 2 7に当 接する。 In FIG. 11, reference numeral 96 denotes a developing roller gear, 94 denotes a swing gear, 62 denotes an image drive main body gear, and 20 R denotes a portion protruding inside the right side wall of the carriage 2. 90 is a fulcrum pin connecting the developing unit 35 and the photoconductor unit 37, and 91 is a circular projection provided on the right side wall 37R of the photoconductor unit 37. The circular protrusion 91 and the swing gear 94 fall into the cutout 29 of the right side wall 20R of the carriage 2, and the swing gear 94 meshes with the developing drive main body gear 62. For this reason, the image forming unit 3 When the head is shaken with the center as the center, the circular protrusion 91 contacts the side surface 27 of the notch 29.
上記した構成において、 感光体 3 0が出力軸 7 0とディテント軸 8 1 にカツプリングされて正規の位置に位置決めされ、 現像駆動本体ギア 6 2が回転する時、 像形成ユニット 3は装置本体 1から感光体 3 0の中心 軸の両端を支持される。 この状態で、 感光体 3 0及び現像駆動本体ギア 6 2が回転すると、 像形成ユニット 3は、 支持された感光体 3 0の中心 軸を中心として半時計回りの回転モーメントを受ける。 この回転モーメ ントは、 円形突起部 9 1がキャリッジ側壁 2 0 Rの切り欠き部 2 9の側 面 2 7に当接することによって止められる。 すなわち、 像形成位置 1 0 で像形成ユニット 3が像形成動作を行うとき、 像形成ユニット 3は、 装 置本体 1から感光体 3 0の中心軸の両端と感光体ュニット 3 7の右側壁 3 7 Rの円形突起部 9 1の 3箇所で支持された状態となる。 このため、 装置本体 1に対する感光体 3 0の位置決めを確実に行うことができると 共に、 像形成ユニット 3が現像駆動力を受けてねじられ、 感光体 3 0と 現像ローラ 3 1の接触を確保しにくくなるという問題も生じない。 また, 円形突起部 9 1が感光体ュニット 3 7の右側壁 3 7 Rに設けられている ので、 像形成ュニット 3全体の回転力が感光体ュニット 3 7のみによつ て支えられることとなるので、 感光体 3 0と現像ローラ 3 1の接触状態 が影響を受けることはない。  In the above-described configuration, when the photosensitive member 30 is coupled to the output shaft 70 and the detent shaft 81 and is positioned at a regular position, and when the developing drive main body gear 62 rotates, the image forming unit 3 is moved from the apparatus main body 1. Both ends of the central axis of the photoconductor 30 are supported. In this state, when the photoconductor 30 and the developing drive main body gear 62 rotate, the image forming unit 3 receives a counterclockwise rotation moment about the center axis of the supported photoconductor 30. This rotational moment is stopped by the circular projection 91 contacting the side surface 27 of the cutout 29 of the carriage side wall 20R. That is, when the image forming unit 3 performs an image forming operation at the image forming position 10, the image forming unit 3 is moved from the device main body 1 to both ends of the central axis of the photoconductor 30 and the right side wall 3 of the photoconductor unit 37. The circular projection portion 9R of 7R is supported at three places. For this reason, the photosensitive member 30 can be reliably positioned with respect to the apparatus main body 1, and the image forming unit 3 is twisted by receiving the developing driving force, thereby ensuring the contact between the photosensitive member 30 and the developing roller 31. There is no problem that it becomes difficult to perform. Further, since the circular protrusion 91 is provided on the right side wall 37R of the photoconductor unit 37, the rotational force of the entire image forming unit 3 is supported by only the photoconductor unit 37. Therefore, the contact state between the photoconductor 30 and the developing roller 31 is not affected.
また、 揺動ギア 9 4と現像駆動本体ギア 6 2は、 感光体ユニット 3 7 に対する現像ュニット 3 5の回動支点である支点ピン 9 0のほぼ中心で 嚙み合っている。 このため、 現像ュニット 3 5が現像駆動本体ギア 6 2 から受けるカは両ギアの圧力角方向である矢印 Pの方向であるが、 この 力によって感光体ュニット 3 7に対する現像ュニット 3 5の支点ピン 9 0を中心とした回転モーメントが発生することはなく、 現像ローラ 3 1 を装置本体 1から駆動する力によって現像ローラ 3 1と感光体 3 0の押 し付け力が発生することはない。 Further, the swing gear 94 and the developing drive main body gear 62 mesh with each other at substantially the center of a fulcrum pin 90 which is a fulcrum of rotation of the developing unit 35 with respect to the photoconductor unit 37. For this reason, the power received by the development unit 35 from the development drive main body gear 62 is in the direction of the arrow P, which is the pressure angle direction of both gears, and this force causes the fulcrum pin of the development unit 35 to the photoconductor unit 37. No torque is generated around 90, and the developing roller 3 1 The pressing force between the developing roller 31 and the photoconductor 30 is not generated by the driving force of the apparatus main body 1.
以上のような構成のために、 現像ローラ 3 1の感光体 3 0に対する押 圧力は、 現像ローラ 3 1の回転中においても、 初期に設定したバネカ Q (圧縮バネ 1 0 2による押圧力) による回転力と、 感光体ユニット 3 7 の左側壁 3 7 L側に設けた引っ張りコイルパネ 1 1 0の引っ張り力のみ であり、 感光体 3 0と現像ローラ 3 1とを常に軽い力で安定して接触さ せることができる。 尚、 揺動ギア 9 4と現像駆動本体ギア 6 2の嚙み合 い変動のために現像ユニット 3 5が現像駆動本体ギア 6 2から受ける力 の方向が多少変動しても、 現像ローラ 3 1と感光体 3 0の押し付け力が 変動することはない。 特に、 一成分接触現像方式のように現像ローラと 感光体を全面にわたって均一にしかもできるだけ弱い力で接触させるこ とが必要な像形成ユニットにおいては、 構成も簡単であり、 安価で高性 能を実現する上で有効である。  Due to the configuration described above, the pressing force of the developing roller 31 against the photoconductor 30 is determined by the spring force Q (the pressing force of the compression spring 102) that is initially set even during the rotation of the developing roller 31. Only the rotational force and the pulling force of the pulling coil panel 110 provided on the left side wall 37 L of the photoreceptor unit 37, and the photoreceptor 30 and the developing roller 31 are always stably contacted with a light force. It can be done. Even if the direction of the force that the developing unit 35 receives from the developing drive main body gear 62 slightly changes due to the fluctuation of the engagement between the swing gear 94 and the developing drive main body gear 62, the developing roller 3 1 And the pressing force of the photoconductor 30 does not fluctuate. In particular, in an image forming unit such as a one-component contact developing system in which the developing roller and the photoreceptor need to be brought into uniform contact with the entire surface with as little force as possible, the configuration is simple, inexpensive and high performance. It is effective in realizing.
次に、 上記のように構成された像形成ユニットの組立及び分解、 並び に消耗品の交換について説明する。  Next, assembly and disassembly of the image forming unit configured as described above, and replacement of consumables will be described.
(像形成ュニットの組立)  (Assembly of image forming unit)
まず、 現像ユニットの筐体に現像ローラ 3 1、 供給ローラ 2 1 7、 シ 一ル部材 2 0 0、 ドクターブレード 2 4を組み込み、 トナーホッパ 3 9 にトナ一 3 2を補給することにより、 現像ュニット 3 5を完成させる First, the developing unit 31 is supplied with the developing roller 31, the supply roller 217, the sealing member 200, and the doctor blade 24 in the housing of the developing unit, and the toner hopper 39 is supplied with the toner 32. Complete 3 5
(図 3参照) 。 また、 感光体ユニットの筐体に感光体 3 0、 コロナ帯電 器 3 4、 クリーニングブレード 3 6を組み込むことにより、 感光体ュニ ット 3 7を組み立てる (図 3参照) 。 次いで、 図 3、 図 6に示すように 現像ユニット 3 5の両側壁 3 5 R、 3 5 Lを感光体ュニット 3 7の両側 壁 3 7 R、 3 7 Lの内側に配置し、 感光体ユニット 3 7の右側壁 3 7 R に設けられた突起部 9 1のピン揷通孔と現像ユニット 3 5の右側壁 3 5 Rに設けられた位置決め孔 1 1 6との位置合わせを行い、 感光体ュニッ ト 3 7の右側壁 3 7 Rの外側から突起部 9 1のピン揷通孔と位置決め孔 1 1 6とにわたって支点ピン 9 0を揷入する。 このとき、 図 1 0に示す ように、 現像ユニット 3 5の左側壁 3 5 Lに固定された現像ローラ 3 1 用の軸受け 1 0 6は、 感光体ユニット 3 7の左側壁 3 7 L側のガイド溝 1 1 5に嵌め込まれた状態となっている。 以上により、 感光体ユニット 3 7と現像ュニット 3 5とは、 支点ピン 9 0によって揺動自在に連結さ れて一体化される。 (See Figure 3). The photoreceptor unit 37 is assembled by incorporating the photoreceptor 30, the corona charger 34 and the cleaning blade 36 into the housing of the photoreceptor unit (see FIG. 3). Next, as shown in FIGS. 3 and 6, the side walls 35 R, 35 L of the developing unit 35 are arranged inside the side walls 37 R, 37 L of the photoconductor unit 37, and the photoconductor unit is disposed. 3 7 Right side wall 3 7 Protrusion provided on R 9 1 Pin hole for 1 and right side wall of developing unit 3 5 3 5 Align with the positioning holes 1 16 provided in the R, and support the fulcrum from the outside of the right side wall 37 R of the photoreceptor unit 37 to the pin holes of the projections 91 and the positioning holes 1 16. Insert pin 90. At this time, as shown in FIG. 10, the bearing 106 for the developing roller 31 fixed to the left side wall 35 L of the developing unit 35 is attached to the left side wall 37 L side of the photoconductor unit 37. It is in a state of being fitted into the guide grooves 1 15. As described above, the photoreceptor unit 37 and the developing unit 35 are swingably connected by the fulcrum pin 90 to be integrated.
次いで、 図 5、 図 6、 図 9に示すように、 揺動ギア 9 4が取り付けら れた揺動レバー 9 2を、 現像ローラギア 9 6と共に現像ユニット 3 5の 右側壁 3 5 Rから突出した現像ローラ軸 2 1 5に取り付けた後に、 現像 ローラ軸 2 1 5の先端部に抜け止め用の Eリング 2 0 3を嵌着する。 次 いで、 図 5に示すように、 揺動レバー 9 2に引っ張りバネ 1 0 4を掛け る。 これにより、 揺動ギア 9 4は現像駆動本体ギア 6 2側に付勢される が、 揺動レバ一 9 2の底面は感光体ュニット 3 7の右側壁 3 7 Rの支点 ピン 9 0の周りの円形突起部 9 1に当接することによって止まる。 最後 に、 図 2、 図 5に示すように、 揺動レバー 9 2等を覆うようにしてカバ - 2 0 4を装着する。  Next, as shown in FIGS. 5, 6, and 9, the swing lever 92 to which the swing gear 94 is attached protrudes from the right side wall 35R of the developing unit 35 together with the developing roller gear 96. After attaching it to the developing roller shaft 215, an E-ring 203 is fitted to the tip of the developing roller shaft 215 to prevent it from falling off. Next, as shown in FIG. 5, a tension spring 104 is applied to the swing lever 92. As a result, the oscillating gear 94 is urged toward the developing drive main unit gear 62, but the bottom surface of the oscillating lever 92 is around the fulcrum pin 90 of the right side wall 37R of the photosensitive unit 37. It stops when it comes into contact with the circular projections 91 of. Finally, as shown in FIGS. 2 and 5, the cover 204 is attached so as to cover the swing lever 92 and the like.
以上のように、 支点ピン 9 0によって感光体ュニット 3 7と現像ュニ ット 3 5とを揺動自在に連結した後に、 揺動レバ一 9 2を、 現像ローラ ギア 9 6と共に現像ュニット 3 5のお側壁 3 5 Rから突出した現像ロー ラ軸 2 1 5に取り付けることにより、 像形成ュニット 3を組み立てるよ うにしたので、 像形成ユニット 3を簡単に組み立てることができる。 す なわち、 揺動レバ一 9 2を、 現像ローラギア 9 6と共に現像ユニット 3 5の右側壁 3 5 Rから突出した現像ローラ軸 2 1 5に取り付けた後に、 支点ピン 9ひによって感光体ュニット 3 7と現像ュニット 3 5とを揺動 自在に連結する組立手順では、 感光体ュニット 3 7の右側壁 3 7 Rに設 けられた突起部 9 1と現像ュニット 3 5の右側壁 3 5 Rに設けられた位 置決め孔 1 1 6との位置合わせを行い、 突起部 9 1と位置決め孔 1 1 6 とに支点ピン 9 0を挿入する際に、 揺動レバ一 9 2が障害となり、 支点 ピン 9 0をスムーズに挿入することができない。 図 5に示すように、 揺 動レバ一 9 2の両側方には感光体 3 0のフランジ 4 1 Rとアイドラーギ ァ 2 1 4とが位置しており、 揺動レバ一 9 2を自由に移動させることが できなくなるからである。 また、 揺動ギア 9 4と現像駆動本体ギア 6 2 の中心間距離を正しく確保するために、 揺動ギア 9 4が取り付けられた 揺動レバ一 9 2の底面を支点ピン 9 0の周りの円形突起部 9 1に当接さ せるようにしているが、 この場合にも、 支点ピン 9 0によって感光体ュ ニット 3 7と現像ュニット 3 5とを揺動自在に連結した後に、 揺動レバ 一 9 2を、 現像ローラギア 9 6と共に現像ュニット 3 5の右側壁 3 5 R から突出した現像ローラ軸 2 1 5に取り付けるようにすれば、 揺動レバ 一 9 2の底面を支点ピン 9 0の周りの円形突起部 9 1に容易に当接させ ることができる。 As described above, after the photoconductor unit 37 and the developing unit 35 are swingably connected by the fulcrum pin 90, the swing lever 92 is moved together with the developing roller gear 96 to the developing unit 3. By attaching the image forming unit 3 to the developing roller shaft 2 15 protruding from the side wall 3 5R of the image forming unit 3, the image forming unit 3 can be easily assembled. That is, after attaching the swing lever 92 together with the developing roller gear 96 to the developing roller shaft 211 protruding from the right side wall 35R of the developing unit 35, the photoconductor unit 3 is supported by the fulcrum pin 9. 7 and developing unit 3 5 In the assembling procedure for freely connecting, the projection 91 provided on the right side wall 37 R of the photoconductor unit 37 and the positioning holes 1 1 6 provided on the right side wall 35 R of the developing unit 35 are included. When the fulcrum pin 90 is inserted into the projection 91 and the positioning hole 1 16 by aligning the fulcrum, the swing lever 92 becomes an obstacle and the fulcrum pin 90 can be inserted smoothly. Can not. As shown in Fig. 5, the flange 41R of the photoconductor 30 and the idler gear 214 are located on both sides of the swing lever 92, and the swing lever 92 can be freely moved. This is because they will not be able to do so. Also, in order to properly secure the center distance between the oscillating gear 94 and the developing drive main body gear 62, the bottom surface of the oscillating lever 92, to which the oscillating gear 94 is attached, is mounted around the fulcrum pin 90. In this case, the photoreceptor unit 37 and the developing unit 35 are swingably connected by a fulcrum pin 90. By attaching the roller 92 to the developing roller shaft 215 projecting from the right side wall 35R of the developing unit 35 together with the developing roller gear 96, the bottom surface of the oscillating lever 192 is connected to the fulcrum pin 90. It can be easily brought into contact with the surrounding circular projections 91.
(像形成ュニットの分解)  (Disassembly of image forming unit)
まず、 カバー 2 0 4を外し、 引っ張りバネ 1 0 4と Eリング 2 0 3を 取り外した後に、 現像ローラ軸 2 1 5から揺動レバー 9 2を、 現像口一 ラギア 9 6と共に抜き取る。 次いで、 感光体ユニット 3 7の右側壁 3 7 Rの外側から支点ピン 9 0を抜き取る。 これにより、 現像ユニット 3 5 と感光体ュニット 3 7を切り離すことが可能となる。  First, after removing the cover 204 and removing the tension spring 104 and the E-ring 203, the swing lever 92 is removed from the developing roller shaft 215 together with the developing opening gear 96. Next, the fulcrum pin 90 is removed from the outside of the right side wall 37R of the photoconductor unit 37. Thus, the developing unit 35 and the photoconductor unit 37 can be separated.
以上のような手順で像形成ュニット 3の組立、 分解を行う構成とすれ ば、 揺動支点ピン 9 0の真上に重なる位置に揺動ギア 9 4を配置するこ とができる。 すなわち、 支点ピン 9 0の少なくとも一部の上方側は、 揺 動ギア 9 4によって被覆される。 このため、 上記したように現像口一ラ 3 1を安定した押圧力で感光体 3 0に押し付けた状態で回転させる構成 を容易に採ることができる。 また、 像形成ユニット 3が組み立てられた 状態で、 支点ピン 9 0が誤って外されるおそれが無くなる。 また、 像形 成ュニット 3の分解時に、 支点ピン 9 0を揺動レバ一 9 2よりも先に外 してしまうおそれがなく、 揺動レバ一 9 2を取り外す際には、 現像ュニ ット 3 5と感光体ュニット 3 7とが一体的に取り付けられているので、 取り外し作業を円滑に行うことができる。 If the image forming unit 3 is assembled and disassembled according to the above-described procedure, the swing gear 94 can be arranged at a position overlapping directly above the swing fulcrum pin 90. That is, at least a part of the upper side of the fulcrum pin 90 is covered with the oscillating gear 94. Therefore, as described above, It is possible to easily adopt a configuration in which the rotating member 31 is pressed against the photosensitive member 30 with a stable pressing force. In addition, in the state where the image forming unit 3 is assembled, there is no possibility that the fulcrum pin 90 is accidentally removed. Also, when disassembling the image forming unit 3, there is no possibility that the fulcrum pin 90 is removed before the swing lever 92, and when removing the swing lever 92, the developing unit Since the photoconductor 35 and the photoconductor unit 37 are integrally attached, the removal work can be performed smoothly.
(消耗品の交換及び再組立)  (Replacement and reassembly of consumables)
上記のようにして現像ュニット 3 5と感光体ュニット 3 7を切り離し た後、 各ユニット内の消耗品を交換する。 現像ユニット 3 5内の消耗品 としては、 トナ一 3 2、 現像口一ラ 3 1、 供給ローラ 2 1 7、 シール部 材 2 0 0、 ドクターブレード 2 4等がある。 また、 感光体ユニット 3 7 内の消耗品としては、 感光体 3 0、 コロナ帯電器 3 4、 クリーニングブ レ一ド 3 6等がある。  After separating the developing unit 35 and the photoconductor unit 37 as described above, replace the consumables in each unit. The consumables in the developing unit 35 include a toner 32, a developing port 31, a supply roller 21, a sealing member 200, a doctor blade 24, and the like. The consumables in the photoconductor unit 37 include a photoconductor 30, a corona charger 34, a cleaning blade 36, and the like.
次いで、 各ユニット 3 5、 3 7内の消耗品を交換した後、 上記と同様 にして、 現像ュニット 3 5の左側壁 3 5 Lに固定された現像ローラ 3 1 用の軸受け 1 0 6を、 感光体ュニット 3 7の左側壁 3 7 L側のガイド溝 1 1 5に嵌め込んだ状態 (図 1 0参照) で、 感光体ユニット 3 7と現像 ユニット 3 5とを支点ピン 9 0によって揺動自在に連結する (図 5、 図 '6参照) 。 次いで、 図 5、 図 6、 図 9に示すように、 揺動ギア 9 4が取 り付けられた揺動レバ一 9 2を、 現像ローラギア 9 6と共に現像ュニッ ト 3 5のお側壁 3 5 Rから突出した現像ローラ軸 2 1 5に取り付けた後 に、 現像ローラ軸 2 1 5の先端部に抜け止め用の Eリング 2 0 3を嵌着 する。 次いで、 図 5に示すように、 揺動レバー 9 2に引っ張りパネ 1 0 4を掛ける。  Next, after replacing the consumables in each of the units 35, 37, the bearing 106 for the developing roller 31 fixed to the left side wall 35L of the developing unit 35 in the same manner as described above, The photoreceptor unit 37 and the developing unit 35 are swung by the fulcrum pin 90 while being fitted into the guide groove 1 15 on the left side wall 37 L of the photoreceptor unit 37 (see FIG. 10). Connect freely (see Fig. 5, Fig. '6). Next, as shown in FIGS. 5, 6, and 9, the oscillating lever 92 with the oscillating gear 94 attached thereto, together with the developing roller gear 96, the side wall 35R of the developing unit 35. After attaching to the developing roller shaft 215 protruding from, an E-ring 203 for retaining is fitted to the tip of the developing roller shaft 215. Next, as shown in FIG. 5, a pull panel 104 is hung on the swing lever 92.
以上により、 消耗品が交換された状態で、 像形成ユニット 3を組み立 てることができる。 Thus, the image forming unit 3 is assembled with the consumables replaced. I can do it.
尚、 本実施の形態においては、 現像ローラ軸 2 1 5の先端部に、 揺動 レバ一 9 2の抜け止め用の Eリング 2 0 3を嵌着するようにしているが、 必ずしもこの構成に限定されるものではない。 像形成ュニット 3のお側 壁を覆うカバー 2 0 4 (図 2参照) に揺動レバー 9 2の抜け止め機能を も持たせるようにすれば、 現像ローラ軸 2 1 5の先端部に Eリング 2 0 3を嵌着する必要はなく、 像形成ュニット 3の分解 ·組立がさらに容易 となる。  In this embodiment, an E-ring 203 for retaining the swing lever 92 is fitted to the tip of the developing roller shaft 211. It is not limited. If the cover 204 that covers the side wall of the image forming unit 3 (see Fig. 2) also has the function of preventing the swing lever 92 from coming off, an E-ring can be attached to the end of the developing roller shaft 211. There is no need to fit 203, and the disassembly and assembly of the image forming unit 3 is further facilitated.
次に、 上記のように構成された画像形成装置を用いて画像を形成する 場合について説明する。  Next, a case where an image is formed using the image forming apparatus configured as described above will be described.
転写ベルトュニット 5と各色の像形成ュニット 3がそれぞれ所定の位 置に装着された状態で装置本体 1の電源を投入すると、 定着器 1 5が昇 温し、 レーザ一露光装置 6のポリゴンミラ一 6 Aが回転を開始して、 準 備が完了する。 尚、 電源投入直後に感光体 3 0や中間転写ベルト 5 0の 状態を整備するイニシャライズモードを動作させる場合もある。  When the power of the apparatus main body 1 is turned on with the transfer belt unit 5 and the image forming unit 3 of each color mounted in predetermined positions, the fixing unit 15 heats up, and the polygon mirror 1 of the laser exposure apparatus 6 is heated. A starts rotating and preparation is completed. In some cases, immediately after the power is turned on, the initialization mode for maintaining the state of the photoconductor 30 and the intermediate transfer belt 50 may be operated.
準備が完了すると、 まず初めに、 像形成位置 1 0にあるイェローの像 形成ユニット 3 Yによる像形成が開始される。 そして、 装置本体 1の駆 動源に連結されたイェローの感光体 3 0が像形成位置 1 0で回転を始め ると同時に、 現像ローラ 3 1、 コロナ帯電器 3 4、 中間転写ベルト 5 0 が動き始める。 駆動プーリ一 5 5 Aは装置本体 1側から駆動され、 その 摩擦力によって中間転写ベルト 5 0が矢印方向に回動する。 ここで、 感 光体 3 0の周速度と中間転写ベルト 5 0の周速度はほぼ等速となるよう に設定されている。 また、 このとき、 2次転写ローラ 9とクリーナ 5 1 は中間転写ベルト 5 0から離間した状態にある。  When the preparation is completed, first, image formation by the yellow image forming unit 3Y at the image forming position 10 is started. Then, the yellow photoconductor 30 connected to the drive source of the apparatus body 1 starts rotating at the image forming position 10, and at the same time, the developing roller 31, the corona charger 34, and the intermediate transfer belt 50 are moved. Start moving. The drive pulley 55A is driven from the apparatus main body 1 side, and the frictional force causes the intermediate transfer belt 50 to rotate in the direction of the arrow. Here, the peripheral speed of the photosensitive body 30 and the peripheral speed of the intermediate transfer belt 50 are set to be substantially equal. At this time, the secondary transfer roller 9 and the cleaner 51 are separated from the intermediate transfer belt 50.
感光体 3 0の表面のうちコロナ帯電器 3 4によって一様に帯電された 部分が露光位置に来るタイミングに合わせて、 検知手段 (図示せず) が 中間転写ベルト 5 0の先頭位置を検知し、 この検知信号に同期してレー ザ一露光装置 6から画像信号に合わせた画素レーザー信号光 8が感光体 3 0に照射される。 一様に帯電した感光体 3 0上に画素レーザー信号光 8が照射されると、 画像信号に応じた静電潜像形成され、 この静電潜像 が現像ュニット 3 5によって順次顕像化されてトナー像が形成される。 次に、 感光体 3 0上に形成されたトナー像は、 中間転写ベルト 5 0に接 触する 1次転写位置に移動し、 この 1次転写位置において中間転写ベル ト 5 0に順次写し取られる。 イエロ一の像形成動作は、 画像の終端が中 間転写ベルト 5 0に転写された後に終了し、 感光体 3 0と中間転写ベル ト 5 0は初期位置に停止する。 The detection means (not shown) is activated in accordance with the timing at which the portion uniformly charged by the corona charger 34 on the surface of the photoconductor 30 comes to the exposure position. The head position of the intermediate transfer belt 50 is detected, and in synchronization with this detection signal, the photoreceptor 30 is irradiated with the pixel laser signal light 8 corresponding to the image signal from the laser exposure unit 6. When the pixel laser signal light 8 is irradiated onto the uniformly charged photoreceptor 30, an electrostatic latent image is formed according to the image signal, and the electrostatic latent image is sequentially visualized by the developing unit 35. Thus, a toner image is formed. Next, the toner image formed on the photoconductor 30 moves to a primary transfer position in contact with the intermediate transfer belt 50, and is sequentially transferred to the intermediate transfer belt 50 at this primary transfer position. . The yellow image forming operation ends after the end of the image is transferred to the intermediate transfer belt 50, and the photoconductor 30 and the intermediate transfer belt 50 stop at the initial position.
尚、 この像形成時において、 コロナ帯電器 3 4は感光体 3 0を— 4 5 0 Vに帯電し、 感光体 3 0の露光電位は一 5 0 Vとなる。 また、 現像口 ーラ 3 1には一 2 5 0 Vの直流電圧が印加されている。 さらに、 中間転 写ベルト 5 0のガイドプーリ一 5 5 Cとテンションプーリ一 5 5 Dには、 + 1 . 0 k Vの直流電圧が印加されている。  During the image formation, the corona charger 34 charges the photoconductor 30 to −450 V, and the exposure potential of the photoconductor 30 becomes 150 V. Further, a DC voltage of 125 V is applied to the developing roller 31. Further, a DC voltage of +1.0 kV is applied to the guide pulley 55 C and the tension pulley 55 D of the intermediate transfer belt 50.
イエロ一の像形成が終了して感光体 3 0と中間転写ベルト 5 0が停止 すると、 次に、 イェローの感光体 3 0に係合していた装置本体 1の駆動 源が感光体 1との係合を解除され、 キャリッジ 2が矢印方向に 9 0 ° だ け回転する。 これにより、 イェローの像形成ユニット 3 Yが像形成位置 1 0から移動すると同時に、 マゼン夕の像形成ユニット 3 Mが像形成位 置 1 0に位置決めされて停止する。 マゼン夕の像形成ユニット 3 Mが停 止すると、 装置本体 1の駆動源がマゼン夕の感光体 3 0に係合して、 像 形成ュニッ卜 3 Mと転写ベルトュニット 5が動作を開始し、 イエロ一の 場合と同様の像形成動作が行われる。 これにより、 中間転写ベルト 5 0 上にはイエロ一とマゼン夕のトナー像が重ねて形成される。  When the yellow photosensitive member 30 and the intermediate transfer belt 50 are stopped after the yellow image formation is completed, the drive source of the apparatus main body 1 engaged with the yellow photosensitive member 30 is connected to the photosensitive member 1. The engagement is released, and the carriage 2 rotates 90 ° in the direction of the arrow. As a result, the yellow image forming unit 3Y moves from the image forming position 10, and at the same time, the magenta image forming unit 3M is positioned at the image forming position 10 and stopped. When the magenta image forming unit 3M stops, the drive source of the apparatus body 1 engages with the magenta photoconductor 30, the image forming unit 3M and the transfer belt unit 5 start operating, and The same image forming operation as in the first case is performed. As a result, yellow and magenta toner images are superimposed on the intermediate transfer belt 50.
以上の動作がシアン、 ブラックと順に繰り返され、 中間転写ベルト 5 0上に 4色のトナー像が形成される。 The above operation is repeated in order of cyan and black, and the intermediate transfer belt 5 A four-color toner image is formed on 0.
ブラックのトナー像を中間転写ベルト 5 0へ転写した後、 画像の先頭 が 2次転写ローラ 9の位置に来たときに、 2次転写ローラ 9を中間転写 ベルト 5 0に接触させて、 給紙ュニット 1 2から送り出された記録用紙 を 2次転写ローラ 9と中間転写ベルト 5 0との間に挟んで搬送すること により、 4色のトナー像を一括して記録用紙上に転写する。 このとき、 2次転写ローラ 9には + 8 0 0 Vの電圧が印加されている。 トナー像が 転写された記録用紙は、 定着器 1 5を通過して定着され、 排紙ローラ 1 8から装置外に排出される。  After the black toner image has been transferred to the intermediate transfer belt 50, when the top of the image comes to the position of the secondary transfer roller 9, the secondary transfer roller 9 is brought into contact with the intermediate transfer belt 50 to feed the paper. By transporting the recording paper sent from the unit 12 between the secondary transfer roller 9 and the intermediate transfer belt 50, the toner images of four colors are collectively transferred onto the recording paper. At this time, a voltage of +800 V is applied to the secondary transfer roller 9. The recording paper onto which the toner image has been transferred passes through a fixing device 15 and is fixed, and is discharged out of the apparatus from a discharge roller 18.
2次転写後に中間転写ベルト 5 0上に残留したトナーは、 クリ一ニン グブレード 5 3が中間転写ベルト 5 0に接触して搔き取られ、 搔き取ら れたトナーはスクリュウ 5 2によって廃トナーケース 5 7に収容される, The toner remaining on the intermediate transfer belt 50 after the secondary transfer is removed by the cleaning blade 53 contacting the intermediate transfer belt 50, and the removed toner is removed by the screw 52. Housed in case 5 7,
2次転写が終了すると、 中間転写ベルト 5 0及び像形成ュニット 3が 再び停止し、 キャリッジ 2が 9 0 ° だけ回転する。 そして、 イエロの像 形成ユニット 3 Yが再び像形成位置 1 0に到達し、 次のカラー画像形成 動作に備えられる。 産業上の利用可能性 When the secondary transfer is completed, the intermediate transfer belt 50 and the image forming unit 3 stop again, and the carriage 2 rotates by 90 °. Then, the yellow image forming unit 3Y reaches the image forming position 10 again and is prepared for the next color image forming operation. Industrial applicability
以上のように、 本発明によれば、 簡単に組み立てることのできる像形 成ュニットを実現することができるので、 トナ一等の消耗品の交換が必 要な画像形成装置に用いられる像形成ュニットに利用可能である。  As described above, according to the present invention, an image forming unit that can be easily assembled can be realized, so that an image forming unit used in an image forming apparatus that requires replacement of consumables such as toner is required. Available to

Claims

請 求 の 範 囲 The scope of the claims
1 . 画像形成装置本体側からの駆動力によって回転する感光体を有す る感光体ュニットと、 前記感光体ュニットに支点ピンによって揺動自在 に連結され、 前記画像形成装置本体側からの駆動力によって回転する現 像ローラを有する現像ュニットとを備え、 前記画像形成装置本体側から 前記現像ローラへの駆動力の付与が、 像形成ュニット本体の端面に配置 された揺動レバ一内に収容され互いに嚙み合う揺動ギア及び現像口一ラ ギアを介して行われる像形成ュニットであって、 前記感光体ュニットと 前記現像ユニットを前記支点ピンによって連結した後、 前記揺動レバ一 を、 前記現像ローラギアを現像ローラ軸に取り付けることによって装着 することにより組み立てられることを特徴とする像形成ュニット。 1. A photoreceptor unit having a photoreceptor that is rotated by a driving force from the image forming apparatus main body side, and is swingably connected to the photoreceptor unit by a fulcrum pin, and a driving force from the image forming apparatus main body side. A developing unit having a developing roller rotated by the image forming apparatus, and a drive force applied from the image forming apparatus main body side to the developing roller is accommodated in a swing lever disposed on an end surface of the image forming unit main body. An image forming unit that is performed via a swing gear and a developing gear that engages with each other, wherein the photosensitive unit and the developing unit are connected by the fulcrum pin. An image forming unit, which is assembled by attaching a developing roller gear by attaching the developing roller gear to a developing roller shaft.
2 . 前記揺動レバーを、 前記現像ローラギアを前記現像ローラ軸から 抜き取ることによって取り外した後、 前記支点ピンを抜き取ることによ り、 前記感光体ユニットと前記現像ユニットとに分解される請求項 1に 記載の像形成ユニット。  2. The photoreceptor unit and the developing unit are disassembled by removing the fulcrum pin after removing the swing lever by removing the developing roller gear from the developing roller shaft. An image forming unit according to claim 1.
3 . 前記感光体ュニッ卜及び前記現像ュニッ卜の少なくとも一方のュ ニット内の消耗品を交換した後、 再度組み立てられる請求項 2に記載の 像形成ュニット。  3. The image forming unit according to claim 2, wherein the image forming unit is reassembled after exchanging consumables in at least one of the photoconductor unit and the developing unit.
4 . 前記感光体ユニット内の消耗品が、 感光体、 コロナ帯電器及びク リーニングブレードからなる群から選ばれる少なくとも 1つである請求 項 3に記載の像形成ュニッ卜。 4. The image forming unit according to claim 3, wherein the consumables in the photoconductor unit are at least one selected from the group consisting of a photoconductor, a corona charger, and a cleaning blade.
5 . 前記現像ユニット内の消耗品が、 トナー、 現像ローラ、 供給ロー ラ、 シール部材及びドクターブレードからなる群から選ばれる少なくと も 1つである請求項 3に記載の像形成ユニット。  5. The image forming unit according to claim 3, wherein the consumable in the developing unit is at least one selected from the group consisting of a toner, a developing roller, a supply roller, a seal member, and a doctor blade.
6 . 前記揺動ギアと前記支点ピンの軸線上で嚙み合うように設けられ、 前記画像形成装置本体側からの駆動力を前記揺動ギアに伝達する現像駆 動本体ギアをさらに備え、 前記支点ピンの少なくとも一部の上方側が前 記揺動ギアによって被覆されている請求項 1に記載の像形成ュニット。6. The swing gear and the fulcrum pin are provided so as to engage with each other on an axis thereof, 2. The image forming apparatus according to claim 1, further comprising a developing drive main body gear for transmitting a driving force from the image forming apparatus main body to the oscillating gear, wherein at least a part of the fulcrum pin is covered by the oscillating gear. An image forming unit according to claim 1.
7 . 前記支点ピンの周りに設けられた突起部をさらに備え、 前記揺動 レバーの一部を前記突起部に当接させるようにした請求項 6に記載の像 形成ュニット。 7. The image forming unit according to claim 6, further comprising a projection provided around the fulcrum pin, wherein a part of the swing lever is brought into contact with the projection.
8 . 画像形成装置本体側からの駆動力によって回転する感光体を有す る感光体ュニットと、 前記感光体ュニットに支点ピンによって揺動自在 に連結され、 前記画像形成装置本体側からの駆動力によって回転する現 像ローラを有する現像ユニットとを備え、 前記画像形成装置本体側から 前記現像ローラへの駆動力の付与が、 像形成ュニット本体の端面に配置 され广こ揺動レバー内に収容され互いに嚙み合う揺動ギア及び現像ローラ ギアを介して行われる像形成ュニットの組立方法であって、 前記感光体 ュニットと前記現像ュニットを前記支点ピンによって連結した後、 前記 揺動レバーを、 前記現像ローラギアを現像ローラ軸に取り付けることに よって装着することを特徴とする像形成ュニットの組立方法。  8. A photoreceptor unit having a photoreceptor that is rotated by a driving force from the image forming apparatus main body side, and is swingably connected to the photoreceptor unit by a fulcrum pin, and a driving force from the image forming apparatus main body side. And a developing unit having a developing roller that rotates with the developing unit. The application of a driving force from the image forming apparatus main body side to the developing roller is disposed on an end face of the image forming unit main body and housed in a wide swing lever. A method for assembling an image forming unit performed via a swing gear and a developing roller gear meshing with each other, wherein after connecting the photosensitive unit and the developing unit by the fulcrum pin, A method for assembling an image forming unit, comprising: attaching a developing roller gear to a developing roller shaft by attaching the developing roller gear to the developing roller shaft.
9 . 画像形成装置本体側からの駆動力によって回転する感光体を有す る感光体ュニットと、 前記感光体ュニットに支点ピンによって揺動自在 に連結され、 前記画像形成装置本体側からの駆動力によって回転する現 像ローラを有する現像ユニットとを備え、 前記画像形成装置本体側から 前記現像ローラへの駆動力の付与が、 像形成ュニット本体の端面に配置 された揺動レバー内に収容され互いに嚙み合う揺動ギア及び現像ローラ ギアを介して行われる像形成ュニットの分解方法であって、 前記揺動レ バーを、 前記現像ローラギアを前記現像ローラ軸から抜き取ることによ つて取り外した後、 前記支点ピンを抜き取ることにより、 前記感光体ュ ニットと前記現像ュニットとに分解することを特徴とする像形成ュニッ トの分解方法。 9. A photoreceptor unit having a photoreceptor that is rotated by a driving force from the image forming apparatus main body side, and is swingably connected to the photoreceptor unit by a fulcrum pin, and a driving force from the image forming apparatus main body side. And a developing unit having a developing roller that rotates with the developing unit. The application of a driving force from the image forming apparatus main body side to the developing roller is accommodated in a swing lever disposed on an end surface of the image forming unit main body. An image forming unit disassembly method performed through an interlocking oscillating gear and a developing roller gear, wherein the oscillating lever is removed by removing the developing roller gear from the developing roller shaft. An image forming unit characterized by being disassembled into the photoreceptor unit and the developing unit by extracting the fulcrum pin. Disassembly method.
1 0 . 複数の像形成ュニットを垂直面内で回転可能に支持するュニッ ト回転体を備え、 前記複数の像形成ュニットを順次像形成位置に移動さ せて画像形成を行う画像形成装置であって、 前記像形成ュニットとして 請求項 1〜 9のいずれかに記載の像形成ュニットを用いることを特徴と する画像形成装置。  10. An image forming apparatus comprising: a unit rotating body that rotatably supports a plurality of image forming units in a vertical plane, and sequentially moves the plurality of image forming units to an image forming position to form an image. An image forming apparatus, wherein the image forming unit according to any one of claims 1 to 9 is used as the image forming unit.
PCT/JP2001/004086 2000-05-19 2001-05-16 Image forming unit, method of assembling and disassembling the unit, and image forming device using the unit WO2001088632A1 (en)

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JPH06242642A (en) * 1993-02-19 1994-09-02 Matsushita Graphic Commun Syst Inc Process cartridge
JPH08292643A (en) * 1995-04-20 1996-11-05 Seiko Epson Corp Developing device
JPH10187005A (en) * 1996-12-20 1998-07-14 Mita Ind Co Ltd Process unit for image forming machine
EP0886191A2 (en) * 1997-06-16 1998-12-23 Matsushita Electric Industrial Co., Ltd. Color image forming apparatus, image forming unit therefor, and transfer belt unit therefor

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