EP3382459B1 - Entwicklungskartusche - Google Patents

Entwicklungskartusche Download PDF

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Publication number
EP3382459B1
EP3382459B1 EP17162946.2A EP17162946A EP3382459B1 EP 3382459 B1 EP3382459 B1 EP 3382459B1 EP 17162946 A EP17162946 A EP 17162946A EP 3382459 B1 EP3382459 B1 EP 3382459B1
Authority
EP
European Patent Office
Prior art keywords
holder
developing cartridge
pressure member
cartridge according
state
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP17162946.2A
Other languages
English (en)
French (fr)
Other versions
EP3382459A1 (de
Inventor
Nao Itabashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries 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 Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to EP17162946.2A priority Critical patent/EP3382459B1/de
Publication of EP3382459A1 publication Critical patent/EP3382459A1/de
Application granted granted Critical
Publication of EP3382459B1 publication Critical patent/EP3382459B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0863—Arrangements for preparing, mixing, supplying or dispensing developer provided with identifying means or means for storing process- or use parameters, e.g. an electronic memory

Definitions

  • the present disclosure relates to a developing cartridge.
  • An electro-photographic type image forming apparatus such as a laser printer and an LED printer is known in the art.
  • the apparatus uses a developing cartridge including a developing roller for supplying toner.
  • Prior art discloses a developing cartridge attachable to a drawer unit.
  • the drawer unit includes a photosensitive drum.
  • the photosensitive drum faces the developing roller.
  • the drawer unit to which the developing cartridge is attached is inserted into the image forming apparatus.
  • Prior art also discloses a developing cartridge attachable to a drum unit including a photosensitive drum.
  • the photosensitive drum faces the developing roller.
  • the drum unit to which the developing cartridge is attached is inserted into the image forming apparatus.
  • a developing cartridge including a storage medium such as IC chip is also known.
  • the storage medium includes an electrical contact surface in contact with an electrical connector of an image forming apparatus or the drawer unit.
  • EP 3 101 483 A1 there is known a developer cartridge attachable to and detachable from a main body of an image forming apparatus.
  • the developer cartridge includes: a memory unit including a circuit and a contact portion on a moving member moved to a first position hidden inside the developer cartridge and a second position protruding outside the developer cartridge; an operating portion configured to move the contact portion to the first position and the second position; an outlet configured to discharge a developer; and a first shutter having an opening position and a closing position for opening and closing the outlet and moved to the closing position and the opening position simultaneously, by the operating portion, when the contact portion is moved to the first position and the second position.
  • the electric contact surface may be scraped against a protruding part of the image forming apparatus or the drawer unit during attachment of the developing cartridge to the image forming apparatus or the drawer unit.
  • a developing cartridge according to one embodiment will be described with reference to Figs. 1 through 12 .
  • a developing cartridge 1 illustrated in Fig. 1 is used for and electro-photographic type image forming apparatus such as a laser printer and an LED printer, and is configured to supply developing agent (for example, toner) to a photosensitive drum 96 ( Fig. 11 ).
  • the developing cartridge 1 is attachable to a drawer unit 90 ( Fig. 8 ) provided at the image forming apparatus.
  • the drawer unit is pulled out of a housing of the image forming apparatus.
  • the drawer unit includes a plurality of slots into which equal plurality of developing cartridges can be inserted.
  • a photosensitive drum is provided at each of the slots.
  • the developing cartridge 1 may be attached to the housing of the image forming apparatus. In this case, the developing cartridge 1 can be inserted in the corresponding slot among a plurality of slots formed in the image forming apparatus. A photosensitive drum is provided at each slot.
  • the developing cartridge 1 may be attached to a drum unit attachable to a housing of the image forming apparatus. In the latter case, the drum unit includes a photosensitive drum. The drum unit to which the developing cartridge 1 is attached is inserted into a slot of the image forming apparatus.
  • the developing cartridge 1 includes a casing 10, an agitator 20, a developing roller 30, a gear portion 40, and an IC chip assembly 50.
  • the IC chip assembly 50 includes an IC chip 51 including an electric contact surface 511, and a pressure member 53.
  • a direction crossing the electric contact surface 511 will be referred to as "a first direction”.
  • the first direction is perpendicular to the electric contact surface 511.
  • a moving direction of the pressure member 53 will be referred to as "a second direction”.
  • an inserting direction of the developing cartridge 1 into the drawer unit, or a moving direction of the casing 10 during detachment of the developing cartridge 1 will also be referred to as "the second direction”.
  • a third direction an extending direction of a rotation axis of the developing roller 30 will be referred to as "a third direction".
  • the first direction and the second direction cross to each other, and preferably perpendicular to each other.
  • the third direction and the first direction cross to each other, and preferably perpendicular to each other.
  • the casing 10 is a container configured to accommodate developing agent, and includes a first outer end surface 11 and a second outer end surface 12.
  • the casing 10 extends in the third direction between the first outer end surface 11 and the second outer end surface 12.
  • the gear portion 40 and the IC chip assembly 50 are positioned at the first outer end surface 11.
  • An interior of the casing 10 includes an accommodation chamber 13 in which developing agent is accommodated.
  • the casing 10 has an end portion in the inserting direction of the developing cartridge 1 with respect to the drawer unit, and an opening 14 is positioned at the end portion.
  • the accommodation chamber 13 and an outside are communicated with each other through the opening 14.
  • the agitator 20 includes an agitator shaft 21 and an agitation blade 22.
  • the agitator shaft 21 is rotatable about a rotation axis (second axis) extending in the third direction.
  • the agitation blade 22 extends radially outward from the agitator shaft 21. At least a portion of the agitator shaft 21 and the agitation blade 22 are positioned in the accommodation chamber 13.
  • the agitator shaft 21 has one end portion in the third direction to which an agitator gear 44 (described later) is fixed.
  • an agitator gear 44 described later
  • the developing roller 30 is rotatable about a rotation axis (first axis) extending in the third direction.
  • the developing roller 30 is positioned to face the opening 14 of the casing 10.
  • the developing roller 30 includes a roller body 31 and a developing roller shaft 32.
  • the roller body 31 is a hollow cylindrical member extending in the third direction and is made from a material providing elasticity such as rubber.
  • the developing roller shaft 32 is a solid cylindrical member extending through the roller body 31 in the third direction.
  • the developing roller shaft 32 is made from metal or resin providing electrical conductivity.
  • the roller body 31 is fixed to the developing roller shaft 32 so that relative rotation therebetween is prevented.
  • the developing roller shaft 32 has one end portion in the third direction to which a developing roller gear 42 (described later) is fixed. Particularly, the one end portion of the developing roller shaft 32 in the third direction is fixed to the developing roller gear 42 not to rotate with respect to the developing roller gear 42. Thus, rotation of the developing roller gear 42 causes rotation of the developing roller shaft 32 and the roller body 31.
  • the developing roller shaft 32 may not extend through the roller body 31 in the third direction.
  • each of a pair of developing roller shafts 32 extends in the third direction from each end of the roller body 31 in the third direction.
  • the developing cartridge 1 further includes a supply roller (not illustrated) positioned between the developing roller 30 and the accommodation chamber 13.
  • the supply roller is rotatable about a rotation axis extending in the third direction.
  • developing agent is supplied from the accommodation chamber 13 of the casing 10 to an outer peripheral surface of the developing roller 30 by way of the supply roller.
  • the developing agent is subjected to triboelectric charging between the supply roller and the developing roller 30.
  • a bias voltage is applied to the developing roller shaft 32 of the developing roller 30. Accordingly, the developing agent is attracted to the outer peripheral surface of the roller body 31 by electrostatic force generated between the developing roller shaft 32 and the developing agent.
  • the developing cartridge 1 further includes a layer thickness regulation blade 33.
  • the regulation blade 33 is configured to regulate a thickness of a layer of the developing agent supplied to the outer peripheral surface of the roller body 31. Then, the developing agent on the outer peripheral surface of the roller body 31 is supplied to the photosensitive drum provided at the drawer unit. In this case, the developing agent is moved from the roller body 31 to the photosensitive drum in accordance with an electrostatic latent image formed on an outer peripheral surface of the photosensitive drum. Thus, the electrostatic latent image becomes a visible image at the outer peripheral surface of the photosensitive drum.
  • the gear portion 40 is positioned at the first outer end surface 11 of the casing 10.
  • the gear portion 40 includes a coupling 41, a developing roller gear 42, an idle gear 43, the agitator gear 44, and a cover 45.
  • a plurality of gear teeth of these gears is omitted in Figs. 3 and 4 .
  • the coupling 41 is configured to firstly receive driving force supplied from the image forming apparatus, and is rotatable about a rotation axis extending in the third direction.
  • the coupling 41 includes a coupling portion 411 and a coupling gear 412.
  • the coupling portion 411 and the coupling gear 412 are formed integrally therewith with resin, for example.
  • the coupling portion 411 has a fixing hole 413 dented in the third direction.
  • An entire outer peripheral surface of the coupling gear 412 includes with a plurality of gear teeth spaced away from each other at a constant interval in a circumferential direction.
  • a drive shaft (not illustrated) of the image forming apparatus is inserted into the fixing hole 413 of the coupling portion 411.
  • the drive shaft and the coupling portion 411 are connected together disabling relative rotation therebetween. Accordingly, upon rotation of the drive shaft, the coupling portion 411 is rotated, so that the coupling gear 412 is also rotated.
  • the developing roller gear 42 is for rotating the developing roller 30, and is rotatable about a rotation axis extending in the third direction.
  • An entire outer peripheral surface of the developing roller gear 42 includes a plurality of gear teeth spaced away from each other at a constant interval in a circumferential direction of the developing roller gear 42.
  • a gear tooth of the coupling gear 412 is in meshing engagement with a gear tooth of the developing roller gear 42.
  • the developing roller gear 42 is fixed to one end portion of the developing roller shaft 32 in the third direction not to rotate with respect to the one end portion of the developing roller shaft 32. Therefore, upon rotation of the coupling gear 412, the developing roller gear 42 is rotated to rotate the developing roller 30.
  • the idle gear 43 is configured to transmit rotation of the coupling gear 412 to the agitator gear 44.
  • the idle gear 43 is rotatable about a rotation axis extending in the third direction, and includes a large diameter gear portion 431 and a small diameter gear portion 432, and the large diameter gear portion 431 and the small diameter gear portion 432 are aligned in the third direction.
  • the small diameter gear portion 432 is positioned between the large diameter gear portion 431 and the first outer end surface 11 of the casing 10. In other words, the large diameter gear portion 431 is positioned farther from the first outer end surface 11 than the small diameter gear portion 432 is from the first outer end surface 11. A diameter of an addendum circle of the small diameter gear portion 432 is smaller than a diameter of an addendum circle of the large diameter gear portion 431.
  • the large diameter gear portion 431 and the small diameter gear portion 432 are integrally formed with each other with resin.
  • Entire outer peripheral surfaces of the large diameter gear portion 431 and the small diameter gear portion 432 include a plurality of gear teeth spaced away from each other at a constant interval in a circumferential direction, respectively.
  • the numbers of gear teeth of the small diameter gear portion 432 is smaller than the numbers of gear teeth of the large diameter gear portion 431.
  • a gear tooth of the coupling gear 412 and a gear tooth of the large diameter gear portion 431 are in meshing engagement with each other.
  • a gear tooth of the small diameter gear portion 432 and a gear tooth of the agitator gear 44 are in meshing engagement with each other.
  • the agitator gear 44 is for rotating the agitator 20 provided in the accommodation chamber 13, and is rotatable about a rotation axis extending in the third direction.
  • An entire outer peripheral surface of the agitator gear 44 includes a plurality of gear teeth spaced away from each other at a constant interval in a circumferential direction.
  • the gear tooth of the small diameter gear portion 432 and the gear tooth of the agitator gear 44 are in meshing engagement with each other, and further, the agitator gear 44 is fixed to the one end portion of the agitator shaft 21 in the third direction so as not to be rotatable relative to the agitator shaft 21. Therefore, upon power transmission to the agitator gear 44 from the coupling 41 through the idle gear 43, the agitator gear 44 is rotated, causing the agitator 20 to rotate.
  • the cover 45 is fixed to the first outer end surface 11 by, for example, screws.
  • the coupling gear 412, the developing roller gear 42, the idle gear 43, and the agitator gear 44 are accommodated in a space defined by the first outer end surface 11 and the cover 45.
  • the fixing hole 413 of the coupling portion 411 is exposed to the outside of the cover 45.
  • the cover 45 also serves as a holder casing for holding a holder 52 (described later) of the IC chip assembly 50.
  • the cover 45 has an opening portion 451. Further, a through-hole 452 extends through the cover 45 in the third direction.
  • the cover 45 includes a first guide surface 453, and an attachment surface 454 described later. A portion of an inner peripheral portion of the through-hole 452 of the cover 45 functions as a second guide surface 455 extending in the first direction ( Fig. 5 ).
  • the cover 45 includes a columnar protrusion 46 ( Fig. 11 ).
  • the IC chip assembly 50 is positioned at a position between the cover 45 and the first outer end surface 11 of the casing 10. As illustrated in Figs. 3 through 6 , the IC chip assembly 50 includes the IC chip 51 as a storage medium, the holder 52 holding the IC chip 51, the pressure member 53, and a coil spring 54.
  • the IC chip 51 is fixed to an end surface in the first direction of the holder 52.
  • the IC chip 51 is configured to store various information as to the developing cartridge 1.
  • the IC chip 51 includes the electric contact surface 511 made from electrically conductive material such as metal.
  • the drawer unit includes a terminal portion. The electric contact surface 511 of the IC chip 51 is brought into contact with the terminal portion as a result of attachment of the developing cartridge 1 to the drawer unit. Thus, the electric contact surface 511 and the terminal portion are electrically connected to each other. Accordingly, the image forming apparatus can perform at least one of reading information from the IC chip 51 and writing information into the IC chip 51.
  • the holder 52 is held between the casing 10 and the cover 45. At least a portion of the holder 52 is covered by the cover 45.
  • the holder 52 extends through the opening 451 of the cover 45 such that a portion of the holder 52 is positioned inside the cover 45, and a remaining portion of the holder52 is positioned outside of the cover 45.
  • the holder includes has a boss 524.
  • the boss 524 protrudes in the third direction toward the cover 45 from a surface of the holder 52 which faces the cover 45.
  • the boss 524 has solid cylindrical shape or prismatic columnar shape or other shape. The boss 524 is inserted in to the through-hole 452 of the cover 45 in the third direction.
  • the through-hole 452 has a dimension (inner dimension) in the first direction greater than a dimension (outer dimension) in the first direction of the boss 524. Therefore, the holder 52 is movable together with the boss 524 in the first direction relative to the casing 10 and the cover 45.
  • the IC chip 51 including the electric contact surface 511 is also movable in the first direction along with the holder 52 in accordance with the movement of the holder 52 in the first direction.
  • the through-hole 452 has a dimension (inner dimension) in the second direction greater than a dimension (outer dimension) in the second direction of the boss 524. Therefore, the holder 52 is movable along with the boss 524 in the second direction relative to the casing 10 and the cover 45.
  • the IC chip 51 including the electric contact surface 511 is also movable in the second direction along with the holder 52 in accordance with the movement of the holder 52 in the second direction.
  • the holder 52 may include a plurality of bosses.
  • the cover 45 may have one through-hole or a plurality of through-holes for allowing the plurality of bosses to be inserted therethrough.
  • the cover 45 may include recessed portion(s) instead of the through-hole(s) for allowing the boss(es) to be inserted thereinto.
  • the holder 52 may include a boss protruding toward the first outer surface 11 of the casing 10.
  • the casing 10 may have a recessed portion for allowing the boss to be inserted thereinto.
  • the holder 52 may be movable in the third direction at a position between the first outer surface 11 of the casing 10 and the cover 45.
  • the holder 52 has one end and another end in the first direction. As illustrated in Fig. 5 , the one end of the holder 52 includes a hold surface 520, a first surface 521, and a second surface 522, and these surfaces 520, 521, 522 are positioned outside of the cover 45 relative to the opening 451.
  • the IC chip 51 is held by the hold surface 520.
  • the first surface 521 is positioned closer to the developing roller 30 than the hold surface 520 is to the developing roller 30.
  • the first surface 521 is sloped with respect to the hold surface 520 such that the first surface 521 approaches the pressure member 53 in the first direction with the increasing distance from the hold surface 520.
  • the second surface 522 is positioned farther from the developing roller 30 than the hold surface 520 is from the developing roller 30.
  • the second surface 522 is sloped with respect to the hold surface 520 such that the second surface 522 approaches the pressure member 52 with the increasing distance from the hold surface 520.
  • first surface 521 and the second surface 522 may be flat surfaces or curved surfaces. These surfaces 521, 522 are preferably smooth surfaces without any stepped portion so as to facilitate insertion of the developing cartridge 1 to the drawer unit without any dragging.
  • the other end of the holder 52 in the first direction has a first inclination surface 523 positioned inside of the cover 45 relative to the opening 451.
  • the first surface 521 is positioned opposite to the hold surface 520, the first surface 521, and the second surface 522 in the first direction.
  • the first inclination surface 523 is a flat surface extending in the third direction, and is inclined with respect to the first and second directions. More specifically, the first inclination surface 523 is inclined such that the first inclination surface 523 is gradually distant from the electric contact surface 511 with the decreasing distance from the developing roller 30.
  • the holder 52 further includes a guide protrusion 525 described later and illustrated in Figs. 6 and 7 .
  • the pressure member 53 is in contact with the holder 52 and is configured to move the holder 52 in the first direction.
  • the pressure member 53 is positioned between the first outer surface 11 and the cover 45 in the third direction.
  • the cover 45 includes the first guide surface 453.
  • the first guide surface 453 of the cover 45 is a portion of an inner surface of the cover 45 covering the pressure member 53 and the coil spring 54.
  • the first guide surface 453 is positioned opposite to the holder 52 with respect to the pressure member 53 in the first direction.
  • the first guide surface 453 extends in the second direction along the pressure member 53 and the coil spring 54.
  • the pressure member 53 is movable in the second direction while being guided by the first guide surface 453.
  • the pressure member 53 includes a pressure surface 531 facing the holder 52.
  • the pressure surface 531 is arcuate in shape whose center of radius of curvature extends in the third direction.
  • the pressure surface 531 is in contact with the first inclination surface 523 of the holder 52. More specifically, a line contact is provided between a portion of the pressure surface 531 and a portion of the first inclination surface 523.
  • the line contact between the pressure surface 531 and the inclination surface 523 can reduce friction therebetween in comparison with a surface contact therebetween.
  • the pressure surface 531 may have a convex shape.
  • the holder 52 may have an arcuate surface whose center of radius extends in the third direction or a convex surface in shape, and such arcuate surface or convex surface may be in contact with the pressure member 53.
  • the pressure surface 531 of the pressure member 53 includes a guide groove 532 as illustrated in Fig. 7 .
  • the guide groove 532 is recessed inward of the pressure member 53 from the pressure surface 531.
  • the guide groove 532 extends along the pressure surface 531 in a direction perpendicular to the third direction.
  • the coil spring 54 extends in the second direction and is a resiliently deformable or elastic member.
  • the coil spring 54 is positioned between the first outer surface 11 of the casing 10 and the cover 45 covering the pressure member 53 and the coil spring 54.
  • the attachment surface 454 of the cover 45 is a portion of the inner surface of the cover 45, and is positioned opposite to the pressure member 53 with respect to the coil spring 54 in the second direction.
  • the attachment surface 454 extends in the first direction.
  • the coil spring 54 has one end in the second direction seated on the attachment surface 454, and another end portion in the second direction seated on the pressure member 53.
  • the coil spring 54 is extendable and shrinkable in the second direction between a first state and a second state providing higher shrinkage than the first state.
  • a length between one end and another end of the coil spring 54 in the second direction in the first state is greater than a length between the one end and the another end of the coil spring 54 in the second direction in the second state.
  • the length of the coil spring 54 in the second direction in the first state and the length of the coil spring 54 in the second direction the second state are smaller than a natural length of the coil spring 54. Therefore, urging force of the coil spring 54 in the second direction is always applied to the pressure member 53. That is, the coil spring 54 is an urging member for urging the pressure member 53 in a direction away from the attachment surface 454.
  • the force directing in the second direction and applied to the pressure member 53 is converted in to a force directing in the first direction by the contact between the pressure surface 531 and the first inclination surface 523. Therefore, the holder 52 receives the elastic force directing in the first direction from the pressure member 53. That is, the holder 52 is urged in a direction away from the first guide surface 453.
  • the holder 52 is positioned at the first position in a case where the coil spring 54 is at the first state, and the holder 52 is positioned at the second position closer to the first guide surface 453 than the holder 52 at the first position is to the first guide surface 453 in a case where the coil spring 54 is at the second state.
  • a distance between the electric contact surface 511 and the pressure member 53 in the first direction in a case where the holder is at the first position is greater than another distance between the electric contact surface 511 and the pressure member 53 in the first direction in a case where the holder is at the second position.
  • the boss 524 is moved in the first direction along the second guide surface 455 of the through-hole 452 of the cover 45 ( Fig. 5 ).
  • the cover 45 may include a second guide surface for guiding the holder 52 in the first direction at a position other than the portion of the peripheral surface of the through-hole 452.
  • the pressure member 53 is nipped or interposed between the holder 52 and the first guide surface 453 at least in a case where the coil spring 54 is at the first state.
  • the pressure member 53 presses the holder 52 in the first direction while the pressure member 53 is supported by the first guide surface 453. Accordingly, the pressing force in the first direction applied to the holder 52 from the pressure member 53 can be increased in comparison with a case where the first guide surface 453 were not provided.
  • the holder 52 includes the guide protrusion 525.
  • the guide protrusion 525 of the holder 52 protrudes from the first inclination surface 523 toward the pressure member 53. Further, the guide protrusion 525 extends along the first inclination surface 523 in a direction perpendicular to the third direction.
  • the guide protrusion 525 is accommodated in the guide groove 532 of the pressure member 53.
  • the guide protrusion 525 is moved along the guide groove 532 in a case where the coil spring 54 is expanded or shrunk between the first state and the second state. Because of the engagement between the guide protrusion 525 and the guide groove 532, displacement between the holder 52 and the pressure member 53 in the third direction can be restrained. As a result, a stabilized pressing force can be transmitted from the pressure member 53 to the holder 52.
  • the pressure member 53 may include a guide protrusion
  • the holder 52 may include a guide groove, so that the guide protrusion of the pressure member 53 is engaged with the guide groove of the holder 52.
  • the developing cartridge 1 For inserting the developing cartridge 1 into the slot 91, the developing cartridge 1 is positioned to face an insertion open end 910 of the slot 91. In this case, the holder 52 has not yet contacted with the drawer unit 90. Therefore, the coil spring 54 is at the first state. Further, the holder 52 is at the first position in the first direction. The developing cartridge 1 will be inserted into the slot 91 in the second direction as indicated by a broken line arrow in Fig. 8 .
  • Each slot 91 of the drawer unit 90 includes a guide plate 92 as illustrated in Figs. 8 through 11 .
  • Each guide plate 92 extends in the second and the third directions.
  • Each guide plate 92 includes a terminal portion 93 which is an electrical contact contactable with the electric contact surface 511 of the IC chip 51.
  • the terminal portion 93 is provided at a surface of the guide plate 92 and extends inward of each slot 91.
  • the terminal portion 93 is made from electrically conductive material such as metal.
  • the guide plate 92 also includes a projection 94 positioned closer to the insertion open end 910 than the terminal portion 93 is to the insertion open end 910.
  • the projection 94 protrudes inward the slot 91 from the guide plate 92.
  • the drawer unit 90 also includes a pressing member 95 ( Fig. 11 ), and a separation lever 97 ( Fig. 12 ).
  • the first surface 521 of the holder 52 is brought into contact with the projection 94 of the guide plate 92, and the holder 52 is moved in the first direction because the first surface 521 is pressed by the projection 94. That is, the holder 52 is moved from the first position to the second position in the first direction. Accordingly, the pressure member 63 is moved in the second direction toward the attachment surface 454 of the cover 45, and the coil spring 54 is compressed from the first state to the second state.
  • the holder 52 approaches the first guide surface 453 of the cover 45 in a case where the holder 52 is brought into contact with an apex portion of the projection 94 as illustrated in Fig. 9 . That is, the holder 52 is positioned at the second position in the first direction, and the coil spring 54 becomes the second state.
  • the length of the coil spring 54 in the second direction becomes shorter than the length of the coil spring 54 that in the first state and in a third state described later.
  • the positions of the holder 52 and the IC chip 51 relative to the cover 45 can be changed in the first direction. Therefore, insertion of the developing cartridge 1 can be performed while changing the position of the electric contact surface 511 in the first direction along the profile of the projection 94. Consequently, the developing cartridge 1 can be inserted with reducing frictional wearing of the electric contact surface 511 relative to the terminal portion 93.
  • the second surface 522 of the holder 52 is moved past the projection 94.
  • the coil spring54 is again expanded from the second state and becomes an intermediate state (third state).
  • a length of the coil spring 54 at the intermediate state is smaller than a length of the coil spring 54 at the first state and greater than a length of the coil spring 54 at the second state.
  • the holder 52 is positioned at a third position in the first direction between the first position and the second position.
  • the electric contact surface 511 of the IC chip 51 is brought into contact with the terminal portion 93 as illustrated in Fig. 10 .
  • a controller of the image forming apparatus can perform at least one of reading information from the IC chip 51 and writing information into the IC chip 51.
  • the electric contact surface 511 contacts the terminal portion 93 while the electric contact surface 511 is moving in the second direction, the electric contact surface 511 is moved in the second direction in sliding contact with the terminal portion 93. In such a case, frictional wearing may occur at the electric contact surface 511 and the terminal portion 93.
  • the electric contact surface 511 is brought into contact with the terminal portion 93 immediately after the holder 52 moves past the protrusion 94. Accordingly, contacting position of the terminal portion 93 relative to the electric contact surface 511 is not changed easily after the contact therebetween. Consequently, frictional wearing of the electric contact surface 511 can further be reduced.
  • the length of the coil spring 54 in the second direction is smaller than a natural length of the coil spring 54. Therefore, the electric contact surface 511 is urged against the terminal portion 93 by the elastic force (repelling force) of the coil spring 54. Accordingly, desirable contact between the electric contact surface 511 and the terminal portion 93 can be maintained.
  • the casing 10 is tilted in the first direction as indicated by a broken line arrow in a case where the casing 10 is further pressed after the electric contact surface 511 contacts the terminal portion 93.
  • the columnar protrusion 46 of the cover 45 is brought into contact with the pressing member 95 of the drawer unit 90.
  • the pressing member 95 presses the columnar protrusion 46 toward the photosensitive drum 96.
  • the developing roller 30 is pressed against the photosensitive drum 96. That is, the developing roller 30 and the photosensitive drum 96 are maintained in contacting state contacting with each other.
  • the posture of the pressure member 53 with respect to the holder 52 is changed in accordance with the operation indicated by the broken line arrow in Fig. 11 .
  • a portion of the arcuate pressure surface 531 and the first inclination surface 523 of the holder 52 are in contact with each other. Therefore, another portion of the pressure surface 531 of the pressure member 53 is brought into contact with the first inclination surface 523 even if the posture of the pressure member 53 relative to the holder 52 is changed. Consequently, a contacting state between the holder 52 and the pressure member 53 can be easily maintained.
  • separating operation can be performed for temporarily separating the developing roller 30 from the photosensitive drum 96 after attachment of the developing cartridge 1.
  • a lever (not shown) of the drawer unit 90 is pushed by a driving force from the image forming apparatus, so that the separation member 97 of the drawer unit 90 is moved in the second direction toward the pressing member 95 as illustrated in Fig. 12 .
  • the separation member 97 is brought into contact with the columnar protrusion 46 to press the columnar protrusion 46 in a direction away from the photosensitive drum 96 against the pressing force from the pressing member 95. Consequently, the casing 10, the developing roller 30, and the cover 45 of the developing cartridge 1 are moved in the second direction as indicated by a broken line arrow in Fig. 12 .
  • the developing roller 30 and the photosensitive drum 96 are at the separating state in which the developing roller 30 and the photosensitive drum 96 are separated from each other.
  • the position of the terminal portion 93 is unchanged not only in the contacting state ( Fig. 11 ) prior to separating operation but also in the separating state ( Fig. 12 ) after separating operation. Further, the position of the pressure member 53 can be maintained at a constant position by the elastic deformation of the coil spring 54. Therefore, the holder 52 is maintained in the nipped state where the holder 52 is nipped between the terminal portion 93 and the pressure member 53 not only in the contacting state but also in the separating state. Accordingly, the electric contact surface 511 is maintained in the state where the electric contact surface 511 is in contact with the terminal portion 93. In this way, the casing 10 and the cover 45 are moved with respect to the holder 52 without changing the position of the holder 52 in the separating operation.
  • the casing 10, the developing roller 30 and the cover 45 are moved in the second direction during the separating operation whereas the position of the holder 52 relative to the drawer unit 90 is unchanged.
  • the position of the casing 10 in the second direction is changed while the position of the electric contact surface 511 with respect to the drawer unit 90 is fixed. Accordingly, the contacting state between the electric contact surface 511 and the terminal portion 93 can be maintained. Further, frictional wearing of the electric contact surface 511 during the separating operation can be reduced.
  • the contacting state between the electric contact surface 511 and the terminal portion 93 can be maintained during transportation of the image forming apparatus in which the developing cartridge 1 is inserted in the drawer unit 90. Therefore, frictional wearing of the electric contact surface 511 can further be reduced.
  • the direction (separating direction) in which the developing roller 30 is moved away from the photosensitive drum during the separating operation is the second direction.
  • the separating direction may be a direction other than the second direction.
  • the separating direction maybe a direction crossing the first direction.
  • a first guide surface 453A of a cover 45A includes a sloped guide surface 456A.
  • the sloped guide surface 456A is a flat surface extending in the third direction and crossing the first and second directions. That is, the sloped guide surface 456A is inclined with respect to a direction of an array of a coil spring 54A and a pressure member 53A. More specifically, the sloped guide surface 456A is inclined so as to approach a holder 52A with the decreasing distance from the developing roller. In other words, the sloped guide surface 456A is inclined so as to approach the holder 52A in the first direction with the increasing distance from an attachment surface 454A.
  • the pressure member 53A approaches the holder 52A with the increasing distance from the attachment surface 454A. That is, the pressing force directed in the second direction of the pressure member 53A is converted into the pressing force directed in the first direction by the contact with the holder 52A, and at the same time, the pressure member 53A itself is moved in the first direction to directly press the holder 52A in the first direction. Accordingly, the pressing force of the pressure member 53A to be applied to the holder 52A in the first direction can further be increased.
  • an IC chip assembly 50B includes a guide member 55B.
  • the guide member 55B is positioned opposite to a holder 52B in the first direction with respect to a pressure member 53B.
  • the guide member 55B includes a first guide surface 453B. With this structure, the pressure member 53B is movable in the second direction while being guided by the first guide surface 453B.
  • the guide member 55B includes a boss 551B.
  • the guide member 55 includes a confronting surface facing a cover 45B, and the boss 551B protrudes in the third direction toward the cover 45B from the confronting surface.
  • Any shape of the boss 551B is available such as cylindrical and prismatic columnar shape.
  • the cover 45B has a through-hole 457B extending through a thickness of the cover 45B in the third direction. The boss 551B is inserted into the through-hole 457B.
  • the through-hole 457B has a dimension (inner dimension) in the first direction greater than a dimension (outer dimension) of the boss 551B in the first direction. Therefore, the guide member 55B is movable along with the boss 551B in the first direction relative to a casing 10B and the cover 45B. Further, the through-hole 457B has a dimension (inner dimension) in the second direction greater than a dimension (outer dimension) of the boss 551B in the second direction. Therefore, the guide member 55B is movable along with the boss 551B in the second direction relative to the casing 10B and the cover 45B.
  • the pressure member 53B and the guide member 55B are movable away from the holder 52B in the first direction. Therefore, the movable range of the holder 52B in the second direction can be increased.
  • a holder 52C has a first inclination surface 523C.
  • the first inclination surface 523C is a flat surface extending in the third direction and crossing the first and second directions. More specifically, the first inclination surface 523C is inclined to be distant from the electric contact surface with the decreasing distance from the developing roller. In other words, the first inclination surface 523C is inclined to approach a first guide surface 453C with the increasing distance from an attachment surface 454C.
  • a pressure member 53C includes a second inclination surface 531C.
  • the second inclination surface 531C is a flat surface extending in the third direction and crossing the first and second directions.
  • the second inclination surface 531C is inclined to be distant from the electric contact surface with the decreasing distance from the developing roller. In other words, the second inclination surface 531C is inclined to approach the first guide surface 453C with the increasing distance from the attachment surface 454C.
  • the first inclination surface 523C faces the second inclination surface 531C, and the first inclination surface 523C and the second inclination surface 531C are in contact with each other at least at the first state of the coil spring 54.
  • the force directing in the second direction and applied to the pressure member 53C can be converted to the force directing in the first direction by the contact between the first and second inclination surfaces 523C and 531C.
  • the holder 52C can be pressed in the first direction.
  • the inclination angle is preferably in a range of from 30 to 60 degrees in order to provide efficient power transmission to the holder 52C and to obtain a sufficient moving distance of the holder 52C in the first direction. More preferably, the inclination angle is in a range of from 40 to 50 degrees.
  • an IC chip assembly 50D includes a first magnet 56D and a second magnet 57D instead of the coil spring.
  • the first magnet 56D is fixed to an attachment surface 454D of a cover 45D.
  • the second magnet 57D is fixed to a pressure member 53D and is movable in the second direction relative to the fixed first magnet 56D.
  • the first and second magnets 56D, 57D include confronting surfaces having the same magnetic pole. Therefore, magnetically repelling force is generated in the second direction between the first and second magnets 56D and 57D on a continuous basis. Accordingly, the pressure member 53D receives a force in the second direction from the second magnet 57D all along the time. That is, the first and second magnets 56D, 57D are urging members for urging the pressure member 53D in a direction away from the attachment surface 454D.
  • the above-described coil spring 54 may be used as the urging member. Further, an elastic member other than the coil spring 54 can be used, such as a torsion spring and a leaf spring. Further, the magnets used in the fourth modification can be used as the urging member in the present disclosure.
  • the IC chip including the electric contact surface is fixed to the outer surface of the holder.
  • an electric contact surface configured to be in contact with an electrical connector may be fixed to the outer surface of the holder, and remaining portion of the IC chip other than the electric contact surface may be positioned at a remaining portion of the developing cartridge.
  • the surface of the holder and the surface of the pressure member are in direct contact with each other.
  • at least one of the surfaces of the holder and the pressure member may be made from polyacetal resin (POM).
  • POM polyacetal resin
  • a lubrication film having low coefficient of friction may be formed over at least one of the surfaces of the holder and the pressure member.
  • Reduction in the friction between the holder and the pressure member facilitates movement of the holder in the first direction and movement of the pressure member in the second direction.
  • the any kind of lubrication films are available as long as the lubrication film provides friction coefficient lower than that of the surface of the member on which the lubrication film is to be formed.
  • Grease is an example of the lubrication film.
  • a portion of the cover functions as a holder casing.
  • a portion of the casing accommodating the developing agent may function as a holder casing.
  • the second direction which is the moving direction of the pressure member is coincident with a direction from the rotation axis (first axis) of the developing roller to the rotation axis (second axis) of the agitator.
  • these directions may be different from each other.
  • the inserting direction of the developing cartridge into the drawer unit is coincident with the second direction. However, these directions may be different from each other.
  • first direction and the second direction may not be perpendicular to each other
  • second direction and the third direction may not be perpendicular to each other
  • first direction and the third direction may not be perpendicular to each other.
  • the gear portion performs meshing engagement between gear teeth.
  • engagement with frictional force may be available instead of the meshing engagement.
  • a friction member such as rubber can be provided at the outer periphery of the meshed gears to each other instead of the plurality of gear teeth.
  • each component used in the developing cartridge may have shape or profile different from that in the above-described embodiment. Further, various features appearing in the above described embodiment and the modifications may be suitably combined together within the scope in which conflicting combination is not generated.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Configuration And Component (AREA)

Claims (17)

  1. Entwicklungskartusche zur Verwendung mit einer Bilderzeugungsvorrichtung der elektrofotografischen Art, wobei die Kartusche aufweist:
    eine Entwicklungswalze (30);
    ein Gehäuse (10), das dafür ausgelegt ist, einen Entwickler aufzunehmen;
    ein Speichermedium (51), das eine elektrische Kontaktoberfläche (511) aufweist;
    eine Halterung (52; 52A; 52B; 52C), die zusammen mit der elektrischen Kontaktoberfläche (511) in einer ersten Richtung, welche die elektrische Kontaktoberfläche (511) kreuzt, bewegbar ist, wobei die Halterung (52; 52A; 52B; 52C) zwischen einer ersten Position und einer zweiten Position relativ zum Gehäuse (10) in der ersten Richtung bewegbar ist; und
    ein Druckausübungselement (53; 53A; 53B; 53C; 53D), das dafür ausgelegt ist, Druck auf die Halterung (52; 52A; 52B; 52C) auszuüben, während sich das Druckausübungselement (53; 53A; 53B; 53C; 53D) in einem Fall, wo sich die Halterung (52; 52A; 52B; 52C) zwischen der ersten Position und der zweiten Position bewegt, in einer zweiten Richtung bewegt, welche die erste Richtung kreuzt, wobei
    ein Abstand in der ersten Richtung zwischen der elektrischen Kontaktoberfläche (511) und dem Druckausübungselement in einem Fall, wo die Halterung (52; 52A; 52B; 52C) an der ersten Position positioniert ist, größer ist als ein Abstand in der ersten Richtung zwischen der elektrischen Kontaktoberfläche (511) und dem Druckausübungselement (53; 53A; 53B; 53C; 53D) in einem Fall, wo die Halterung (52; 52A; 52B; 52C) in der zweiten Position positioniert ist, gekennzeichnet durch ein Halterungsgehäuse (45; 45A; 45B; 45C; 45D), das dafür ausgelegt ist, die Halterung (52; 52A; 52B; 52C) zu halten; und
    ein Vorspannelement (54; 54A; 54C; 56D, 57D), das dafür ausgelegt ist, das Druckausübungselement (53; 53A; 53B; 53C; 53D) vorzuspannen, wobei das Vorspannelement (54; 54A; 54C; 56D, 57D) in der ersten Richtung einen ersten Zustand und einen zweiten Zustand aufweist, wobei das Vorspannelement (54; 54A; 54C; 56D, 57D) ein Ende in der zweiten Richtung aufweist und ein anderes Ende in der zweiten Richtung aufweist, wobei das eine Ende am Halterungsgehäuse (45; 45A; 45B; 45C; 45D) befestigt ist, das andere Ende am Druckausübungselement (53; 53A; 53B; 53C; 53D) befestigt ist,
    wobei ein Abstand zwischen dem einen Ende und dem anderen Ende im ersten Zustand größer ist als ein Abstand zwischen dem einen Ende und dem anderen Ende im zweiten Zustand,
    wobei die Halterung (52; 52A; 52B; 52C) in einem Fall, wo das Vorspannelement (54; 54A; 54C; 56D, 57D) den ersten Zustand aufweist, die erste Position einnimmt, und
    wobei die Halterung (52; 52A; 52B; 52C) in einem Fall, wo das Vorspannelement (54; 54A; 54C; 56D, 57D) den zweiten Zustand aufweist, die zweite Position einnimmt.
  2. Entwicklungskartusche nach Anspruch 1, wobei das Halterungsgehäuse (45; 45A; 45B; 45C; 45D) eine erste Führungsoberfläche (453; 453A, 456A; 453C) aufweist, die sich in der zweiten Richtung erstreckt und dafür ausgelegt ist, das Druckausübungselement (53; 53A; 53B; 53C; 53D) zu lenken; wobei die erste Führungsoberfläche (453; 453A, 456A; 453C) in Bezug auf das Druckausübungselement (53; 53A; 53B; 53C; 53D) entgegengesetzt zur Halterung (52; 52A; 52B; 52C) positioniert ist.
  3. Entwicklungskartusche nach Anspruch 2, wobei das Druckausübungselement (53; 53A; 53B; 53C; 53D) in einem Fall, wo das Vorspannelement den ersten Zustand aufweist, zwischen der Halterung (52; 52A; 52B; 52C) und der ersten Führungsoberfläche (453; 453A, 456A; 453C) eingeklemmt ist.
  4. Entwicklungskartusche nach Anspruch 3, wobei die erste Führungsoberfläche (453A, 456A) eine schräge Führungsoberfläche (456A) aufweist, die in Bezug auf die zweite Richtung geneigt ist, wobei sich die schräge Führungsoberfläche mit zunehmendem Abstand von dem einem Ende des Vorspannelements (54; 54A; 54C; 56D, 57D) in der zweiten Richtung der Halterung (52A) in der ersten Richtung annähert.
  5. Entwicklungskartusche nach einem der Ansprüche 1 bis 4, wobei die Halterung (52C) eine erste schräge Oberfläche (523C) aufweist, die in Bezug auf die erste Richtung und die zweite Richtung geneigt ist, wobei
    das Druckausübungselement (53C) eine zweite schräge Oberfläche (531C) aufweist, die der ersten geneigten Oberfläche (523C) gegenüberliegt, wobei in einem Fall, wo das Vorspannelement (54C) einen ersten Zustand aufweist, die erste schräge Oberfläche (523C) und die zweite schräge Oberfläche (531C) einander berühren.
  6. Entwicklungskartusche nach Anspruch 5, wobei die erste schräge Oberfläche (523C) in Bezug auf die erste Richtung in einem Bereich von 30 Grad bis 60 Grad geneigt ist.
  7. Entwicklungskartusche nach einem der Ansprüche 1 bis 4, wobei eines von der Halterung (52; 52A; 52B) und dem Druckausübungselement (53; 53 A; 53B; 53D) eine konvexe Oberfläche aufweist, die dafür ausgelegt ist, mit dem anderen von der Halterung (52; 52A; 52B) und dem Druckausübungselement (53; 53A; 53B; 53D) in Kontakt zu stehen.
  8. Entwicklungskartusche nach einem der Ansprüche 1 bis 7, wobei das Halterungsgehäuse (45) eine zweite Führungsoberfläche (455) aufweist, die sich in der ersten Richtung erstreckt, wobei die Halterung (52) in der ersten Richtung entlang der zweiten Führungsoberfläche (455) bewegbar ist.
  9. Entwicklungskartusche nach einem der Ansprüche 1 bis 8, wobei das Vorspannelement (54; 54A; 54C) ein elastisches Element ist, das zwischen dem ersten Zustand und dem zweiten Zustand verlängerbar und verkürzbar ist.
  10. Entwicklungskartusche nach Anspruch 9, wobei das elastische Element eine Feder ist, die in der zweiten Richtung zwischen dem einen Ende und dem anderen Ende verlängerbar und verkürzbar ist.
  11. Entwicklungskartusche nach einem der Ansprüche 1 bis 8, wobei das Vorspannelement (56D, 57D) ein Magnet ist, der dafür ausgelegt ist, eine magnetische Kraft zwischen dem einen Ende und dem anderen Ende zu erzeugen, um das Druckausübungselement vorzuspannen.
  12. Entwicklungskartusche nach einem der Ansprüche 1 bis 11, wobei das Halterungsgehäuse (45) eine Durchgangsbohrung (455) oder einen Ausnehmungsabschnitt aufweist;
    wobei die Halterung (52) eine Erhebung (524) aufweist, die in einer Richtung vorsteht, welche die erste Richtung und die zweite Richtung kreuzt, wobei die Erhebung (524) in die Durchgangsbohrung (455) oder den Ausnehmungsabschnitt eingefügt ist, wobei
    in der ersten Richtung eine Abmessung der Durchgangsbohrung (455) oder des Ausnehmungsabschnitts größer ist als eine Abmessung der Erhebung.
  13. Entwicklungskartusche nach einem der Ansprüche 1 bis 12, wobei eines von der Halterung und dem Druckausübungselement einen Führungsvorsprung (525) aufweist, der zum anderen von der Halterung (52) und dem Druckausübungselement (53) vorsteht, und
    das andere von der Halterung (52) und dem Druckausübungselement (53) eine Führungsnut (532) aufweist, die mit dem Führungsvorsprung (525) in Eingriff steht, wobei der Führungsvorsprung (525) in einem Fall, wo das Vorspannelement (54) zwischen dem ersten Zustand und dem zweiten Zustand wechselt, entlang der Führungsnut (532) bewegbar ist.
  14. Entwicklungskartusche nach einem der Ansprüche 1 bis 13, wobei die Halterung (52, 52A, 52B, 52C) in der zweiten Richtung relativ zum Gehäuse (10) bewegbar ist.
  15. Entwicklungskartusche nach einem der Ansprüche 1 bis 14, wobei die Entwicklungskartusche in eine Bilderzeugungsvorrichtung oder eine Einheit (90), die auf lösbare Weise an einer Bilderzeugungsvorrichtung anbringbar ist, eingefügt werden kann, wobei
    die zweite Richtung eine Richtung ist, in der die Entwicklungskartusche eingefügt wird.
  16. Entwicklungskartusche nach einem der Ansprüche 1 bis 15, wobei die Entwicklungswalze (30) um eine erste Achse drehbar ist, die sich in einer dritten Richtung erstreckt, welche die erste Richtung und die zweite Richtung kreuzt, wobei
    die Entwicklungskartusche ferner einen Rührer (20) umfasst, der um eine zweite Achse drehbar ist, die sich in der dritten Richtung erstreckt, wobei
    die zweite Richtung durch Verbinden der ersten Achse mit der zweiten Achse definiert ist.
  17. Entwicklungskartusche nach Anspruch 11, wobei der Magnet aufweist: einen ersten Magneten (57D), der am Halterungsgehäuse (45D) an einer Position fixiert ist, die dem ersten Ende entspricht, und einen zweiten Magneten (56D), der am Druckausübungselement (53D) an einer Position fixiert ist, die dem anderen Ende entspricht, wobei der erste Magnet (57D) und der zweite Magnet (56D) dafür ausgelegt sind, eine magnetische Abstoßungskraft zu erzeugen.
EP17162946.2A 2017-03-27 2017-03-27 Entwicklungskartusche Active EP3382459B1 (de)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
JP5094823B2 (ja) * 2009-12-02 2012-12-12 株式会社沖データ 画像形成装置
KR20160143391A (ko) * 2015-06-05 2016-12-14 에스프린팅솔루션 주식회사 현상제 카트리지 및 이를 채용한 전자사진방식 화상형성장치

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