• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A developing unit adapted to work with a two-component developing material comprising carrier particles to which toner particles adhere; the developing unit comprises: at least one developing part rotatably mounted in the housing and adapted to transfer toner particles to a photoconductor element; a transport assembly adapted to transport toner particles to the at least one developing part or away from the at least one developing part; wherein the conveyor assembly comprises a conveyor screw, the conveyor screw comprising a rod-shaped shaft, a spiral blade arranged around the shaft, and at least a first elongate element disposed at a distance from the shaft.
    公开号:BE1025815B1
    申请号:E2017/5041
    申请日:2017-01-24
    公开日:2019-10-23
    发明作者:Dessel Bart Jozef Van；De Straete Herman Jan Godelieve Van
    申请人:Xeikon Manufacturing N.V.；
    IPC主号:
    专利说明:

    A development unit with improved transport assembly
    Technical field of invention
    The technical field of the invention relates to developing units for developing an electrostatic latent image. Particular embodiments relate to a developing unit for developing an electrostatic latent image with dry two-component developing material.
    Background
    In electrophotographic printing apparatus, an electrostatically charged image is formed on a dielectric recording part which can be a photoconductive dielectric recording part which, after being uniformly charged, is image-wise exposed to conductive-increasing radiation, thereby producing a direct or reversing toner development charge pattern on the recording part.
    Two-component and one-component developing materials are generally known. A typical two-component developing material contains magnetic carrier particles which have toner particles which are adhered to the carrier particles. A one-component developing material typically comprises toner particles that have an electrostatic charge so that they are attracted to and attached to a latent image on the photoconductive surface. The present invention is particularly useful for two-component systems and hybrid systems that use two-component development materials.
    When a two-component developing material is used, toner particles are mixed with larger magnetizable carrier particles. The toner particles adhere to the magnetizable carrier particles by electrostatic attraction. The electrostatic charge of the toner and carrier particles is triboelectrically obtained by movement.
    A developing unit applies the toner carrier mixture to the surface that carries the electrostatic charged image, the toner and magnetizable carrier particles being mixed and a layer of the toner carrier mixture, also referred to as developing material, is taken up by the developing part such as a rotating sleeve or drum which has magnets inside, thereby forming a so-called magnetic brush on a magnetic roller. During the rotation of the magnetic roller, the toner particles still attached to the magnetically attracting carrier particles are introduced into a developing zone where the toner particles are separated from the carrier particles by the electrostatic attraction forces of the electrostatic latent image to be developed and transferred to the latent electrostatic
    BE2017 / 5041 loaded image. A suitable bias development bias voltage applied between the magnetic brush and the recording part being developed can determine whether the development is a "direct" or "reversal" development.
    The magnetic brush must be supplied with a fresh toner carrier mixture. This is normally done by an agitator, for example, a paddle wheel, which propels or scoops the toner carrier mixture from the housing containing the developing material to the magnetic brush. The partially depleted developing material is recycled to the bulk of the developing material that is held in the housing and needs to be properly mixed on time with freshly added toner particles for the purpose of keeping the toner carrier weight ratio within acceptable limits to achieve consistent development results.
    Resume
    Embodiments of the invention have the purpose of mixing, transporting and improving the development properties of a developing unit, and in particular improving the uniformity of the developing material within the developing unit, while at the same time keeping the developing unit compact. Particular embodiments focus on improving a developing unit using a two-component developing material, and more particularly for the purpose of achieving a more uniform toner particle concentration of the developing material.
    According to a first aspect of the invention, a development unit is provided which comprises a housing which has an input and an output; at least one developing member that is rotatably mounted in the housing and adapted to transfer toner particles to a photoconductor element; and a transport assembly adapted to transport toner particles to the at least one developing part or away from the at least one developing part. The transport assembly comprises at least one feed transport part, which is rotatably mounted in the housing and adapted to transport toner particles from the entrance to the at least one developing part. The at least one feed transport part comprises a transport screw and the transport screw comprises a rod-shaped shaft, a spiral screw blade arranged around the shaft, and at least a first elongate element which is arranged at a distance from the shaft. The transport assembly further comprises a discharge transport part, which is rotatably mounted in the housing and adapted to transport toner particles from the at least one developing part to the exit. The input and the output can be connected to a mixing fill module, with fresh toner particles being added to the developing material
    BE2017 / 5041 from the output of the housing. The mixture of the developing material used with the fresh toner particles can then be re-introduced into the housing via the entrance.
    Embodiments are based inter alia on the inventive insight that by performing a simple adjustment of a conveyor screw of the conveyor assembly, the developing material can be moved and transported perpendicular to the conveying direction of the conveyor screw during the conveying of the developing material from the entrance to the entrance to the conveyor. at least one developmental part. In other words, the transport screw with the elongated element satisfies both the movement function and the transport function. This will lead to a more uniform concentration of toner particles in the developing material in the developing unit.
    According to an exemplary embodiment, the developing unit is adapted to operate with a two-component developing material which comprises carrier particles to which the toner particles adhere, and wherein the at least one developing part comprises a developing brush comprising a rotating sleeve and at least one magnetic part inside the rotating sleeve. When developing material is to be supplied to at least one developing part, the modified transport screw of the present invention will be particularly advantageous in improving the uniformity of the toner particle concentration, and as such the development quality of the developing unit.
    In an exemplary embodiment, the first elongate element is arranged against an outer edge of the spiral screw blade. The first elongate element can be secured to the outer edge by a suitable means or technique, for example by welding, by bonding, by using mechanical fasteners, etc. Such a device is particularly simple to implement since the first elongate element is for example can be a straight bar that is bonded, for example welded, at a number of points on the outer edge of a commercially available conveyor screw.
    In another exemplary embodiment, the first elongate element extends through the spiral screw blade. This can be achieved by drilling holes in the spiral screw blade and inserting a rod through the holes of the blade.
    In an exemplary embodiment, the first elongate element is arranged parallel to the axis. In this way, a straight elongate element can be used which leads to flow of the developing material in a transverse direction transverse to the axis of the axis.
    BE2017 / 5041
    In an exemplary embodiment, the elongate element extends at least 50 percent of the length of the spiral screw blade. More preferably, the first elongate member extends over at least 80 percent of the total length of the helical screw blade, and most preferably extends over at least 90 percent of the total length of the helical screw blade. In this way the influence of the first elongated element can be easily achieved over a substantial part of the length of the conveyor screw.
    In an exemplary embodiment, a plurality of elongated elements are disposed at a distance from the axis, and the plurality of elongated elements extend at least 50 percent of the length of the helical screw blade, more preferably at least 80 percent of the total length of the spiral screw blade, and most preferably over at least 90 percent of the total length of the spiral screw blade. In other words, in such an embodiment, the plurality of elongated elongate elements covers a substantial part of the length of the conveyor screw.
    In an exemplary embodiment, a plurality of elongated elements are arranged at different distances from the axis. This can further improve the operation of the conveyor screw, in particular when there is a variation in material mass in the conveyor screw.
    In an exemplary embodiment, the plurality of elongated elements is arranged in parallel with the axis.
    In an exemplary embodiment, an elongate member of the plurality of elongated members is either disposed against an outer edge of the spiral blade or extends through the spiral blade.
    In an exemplary embodiment, the drain transport part comprises a drain transport screw which is arranged in parallel with at least one developing part. The drainage screw is preferably arranged such that the developing material recovers over the entire length of the developing part. The outlet is preferably arranged at one end of the drain conveyor screw. The outlet can be aligned with an axial direction of the drain conveyor screw. Preferably, the drainage screw has a shaft and a helical blade with a variable pitch, the pitch increasing in the discharge direction of the drainage screw. Such an increasing pitch will lead to a more constant lateral filling flow of the conveyor screw over the length of the conveyor screw. Indeed,
    BE2017 / 5041 since the drainage screw is arranged parallel to the at least one developing part and the developing material recovers over the full length of the developing part, the volume to be transported will increase in the drain transport direction of the drain transport screw.
    In an exemplary embodiment, the at least one feed conveyor part comprises at least one paddle wheel, which is arranged downstream of the conveyor screw with the first elongated elongate element and upstream of the at least one developing part. This at least one blade wheel will propel or scoop up the moved developing material flow, which flow comes from the adjusted conveyor screw in the direction of the at least one developing part.
    In an exemplary embodiment, the at least one supply transport part comprises a first transport screw, which is arranged in parallel with and above the transport screw with the first elongate element. The entrance is preferably arranged at one end of the first transport screw, such that the first transport screw receives toner particles which flow through the entrance. The input can be aligned with an axial direction of the first conveyor screw. Preferably, the first transport screw and the transport screw with the first elongate element rotate in the same direction. A trough with an integrated cascade plate is preferably located below the first transport screw, the first transport screw being arranged and arranged for transporting toner from the entrance, over the cascade plate to the transport screw with the first elongate element. Preferably, the vertical distance between the top of the cascade plate and the bottom of the transport space associated with the first transport screw decreases in the transport direction of the first transport screw. In an exemplary embodiment, the height of the cascade plate decreases in the conveying direction of the first conveying screw. In another embodiment, the cascade plate has a horizontal top edge, and the first conveying screw is slightly inclined in the conveying direction of the first conveying screw within the conveying space. In this way the adjusted conveyor screw is provided over its entire length with a more or less constant flow over the cascade plate, and the adjusted conveyor screw will then cause a suitable flow in the direction of the at least one developing part, optionally via one or more blade wires.
    In an exemplary embodiment, the elongate element is a linear elongate element, for example a straight bar. Such a straight bar can be fixed on the spiral screw blade, preferably on an outer edge thereof.
    BE2017 / 5041
    In a preferred embodiment, the elongate element is a curved elongate element, preferably a spirally curved bar. Such a curved bar can be fixed to a spiral screw blade, preferably to an outer edge thereof. When the curved bar is in the form of a spiral shape, the direction of the spiral can rotate or counter-rotate in relation to the direction of the spiral of the spiral-shaped screw blade. When having a counter-rotating direction, it becomes possible to slightly reverse the flow, whereby further flow optimizations are possible. In addition, the pitch of the spirally curved bar can be constant or variable, depending on the desired flow properties. Preferably the pitch of the spiral curved bar is at least twice, and preferably at least three times, the pitch of the spiral screw blade.
    Brief description of the figures
    The accompanying figures are used to illustrate presently preferred and non-limiting exemplary embodiments of devices according to the present invention. The aforementioned and other advantages of the elements and objects of the invention will become more apparent and the invention will be better understood with reference to the following detailed description when read in conjunction with the accompanying drawings in which:
    Figure 1 schematically illustrates a development unit of an exemplary embodiment;
    Figure 2 illustrates a schematic cross-section of the developing unit of an exemplary embodiment;
    Figures 3A and 3B schematically illustrate perspective drawings of a part of the developing unit of Figure 2, with and without the housing, respectively, looking at the discharge side;
    Figure 4 illustrates a schematic perspective drawing of a toner filling unit of the developing unit of Figure 2, without the housing, when looking at the supply side;
    Figures 5A and 5B illustrate a perspective drawing and a side view of a conveyor screw with an elongate element according to an exemplary embodiment, respectively;
    Figures 6A and 6B illustrate a perspective view and a side view of a variable-screw conveyor screw according to an exemplary embodiment, respectively;
    BE2017 / 5041
    Figures 7A-7D illustrate other exemplary embodiments of a conveyor screw with an elongate element.
    Description of the embodiments
    Figure 1 schematically illustrates a general embodiment of a developing unit 1000. The developing unit 1000 includes a developing part 100 and a transport assembly 300. Developing part (DEV) 100 is rotatably suspended and arranged for transporting toner particles to a photoconductor (PC) part 200. Transport assembly 300 is arranged for transporting toner particles T to the developing part 100 or away from the developing part 100, see arrow A. Transport assembly 300 comprises a modified transport screw 330. A modified transport screw 330 comprises a rod shaped shaft 331, a spiral screw blade 333 arranged around the shaft 331 and at least a first elongate member 335 disposed at a distance from the axis 331.
    Figures 2, 3A, 3B and 4 illustrate an exemplary embodiment of a developing unit 1000 adapted for use with a two component developing material. The developing unit 1000 comprises a housing 400 in which a first developing part 100, a second developing part 110, and a transport assembly 310, 320, 330, 340, 350, 360 are arranged. Developing parts 100, 110 are rotatably suspended and are adapted to transfer toner particles to a photoconductor element 200. Developing parts 100, 110 comprise a rotating sleeve or drum which has magnetic parts 112 inside, thereby forming a so-called magnetic brush on a magnetic roller.
    For the illustrated embodiment, a stationary magnet structure 112 is provided within each magnet developing roller 100,110. The magnet structure 112 is designed to remain in a position while the magnet developing roller 100, 110 rotates around it. The magnet structure 112 includes any number of magnet members 112 as needed, and these magnet members 112 may be in the form of discrete metal magnets, or may have areas of specific magnet polarity within a continuous structure. The magnet structure can also comprise electromagnets. The purpose of the magnet structure 112 in the magnet developing rollers 100, 110 is to attract magnetic carrier particles from the developing material and cause the magnetic carrier particles to be magnetically attracted to the surface of the magnet developing rollers 100, 110 while a given portion of the surface of the magnet developing rollers 100, 110 is moved to the development zone. The operation with two-component developing material generally functions as follows: the carrier particles,
    BE2017 / 5041 attracted by the magnets 112 form the fibers of a "magnetic brush". Toner particles are triboelectrically attached to the carrier particles. The magnetic brush of carrier particles thus serves to transport the toner particles to the developing zone. Between the first developing part 100 and the second developing part 110, a metering part 130 including a first scraper blade 131 and a second scraper blade 132 is provided for checking a layer with a desired thickness such that a suitable amount of carrier material is present in the developing zone.
    The transport assembly comprises feed transport parts 310, 320, 330, 340, 350 and a drain transport part 360. Feed transport parts 310, 320, 330, 340, 350 are arranged for transporting toner particles T from an entrance 410 of the housing 400 to the developing parts 100, 110 Output transport part 360 is adapted to transport toner particles T from developing parts 100, 110 to an output 420 of the housing 400. Output 420 leads to a movement and fill module 500 where additional toner particles T are added to the developing material and where the developing material is added. moved.
    Feed transport parts 310, 320, 330, 340, 350 include a first transport screw 310, which is associated with a trough 320, a modified transport screw 330, a first paddle wheel 340, and a second paddle wheel 350. First transport screw 310 is arranged and arranged for transporting of toner particles T from an input 410, over a cascade plate 321 of a trough 320 to the adjusted conveyor screw 330 which is parallel to and lower than the first conveyor screw 310. Optionally, the first conveyor screw 310 may extend through the entrance 410 to the moving and fill module 500. The height of the cascade plate 321 decreases in the conveying direction of the first conveying screw 310, see Figure 4. First and second paddle wheels 340, 350 are mounted downstream of the adapted conveying screw 330 and upstream of the developing parts 100, 110.
    Adapted conveyor screw 330 comprises a rod-shaped shaft 331, a spiral-shaped screw blade 333 which is arranged around shaft 331, and at least a first elongated element 335 which is arranged at a distance from shaft 331, see also figures 5A and 5B. The first elongated element 335 is arranged against an outer edge of the spiral screw blade 335, and extends over at least 80% of the entire length of the spiral screw blade 335, and preferably over substantially the entire length of the spiral screw blade 335. The first elongated element 335 is arranged in parallel with the axis 331.
    BE2017 / 5041
    Discharge conveyor screw 360 comprises a shaft 361 and a spiral-shaped screw blade 363 with a variable pitch, see also Figures 6A and 6B, wherein the pitch increases in the discharge direction of the discharge conveyor screw 360.
    Figures 7A-7D illustrate other exemplary embodiments of a conveyor screw with an elongate element. Fig. 7A illustrates a side view of a modified transport screw 330 which includes a rod-shaped shaft 331, a spiral screw blade 333 arranged around the shaft 331 and a first elongate element 335 which is disposed at a distance from the shaft 331. In this embodiment, the first elongate extends element 335 extends through the spiral-shaped screw blade 333.
    Figure 7B illustrates a side view of a modified transport screw 330 which includes a rod-shaped shaft 331, a spiral screw blade 333 arranged around an axis 331, and a plurality of elongated elements 335 disposed at a distance from the axis 331. In this embodiment, the plurality of elongated elements 335 fixed to an outer wall of a spiral-shaped screw blade 333. Figure 7B shows two elongated elements 335, but the person skilled in the art understands that more than two elongated elements can also be arranged. Preferably, the plurality of elongated elements 335 extend at least 80 percent of the length of the helical screw blade 333.
    Fig. 7C illustrates a side view of a modified transport screw 330 which includes a rod-shaped shaft 331, a spiral screw blade 333 arranged around shaft 331, and a plurality of parallel elongate elements 335, 335 'disposed at a distance from the shaft 331. In this embodiment, the plurality of elongated elements 335 express themselves through the helical screw blade 333 but those skilled in the art will appreciate that the plurality of elongated elements 335 can also be fixed to an outer edge of the helical screw blade 333. In Figure 7C, two elongated elements 335, 335 but the person skilled in the art understands that more than two elongated elements can also be provided.
    Figure 7D illustrates a perspective view and a side view of a modified conveyor screw 330 which includes a rod-shaped shaft 331, a spiral-shaped screw blade 333 arranged around the shaft 331, and a curved elongate element 335 disposed at a distance from the shaft 331. In this embodiment, elongated element 335 a spiral-shaped curved element which is fixed on an outer edge of the spiral-shaped screw blade 333. Fig. 7D shows a curved elongated element 335, but the person skilled in the art understands that more than one elongated element can also be provided. Also, instead of a constant rush,
    BE2017 / 5041, the spiral-shaped curved elongate element 335 may have a variable pitch for the purpose of varying the lateral flow rate. The direction of the spiral of the elongated element 335 can be co-rotating or counter-rotating in relation to the direction of the screw of the spiral screw blade. By having a counter-rotating direction, it becomes possible to slightly reverse the flow, thereby providing further flow optimisations. Preferably the pitch of the spiral curved bar is at least twice, and more preferably at least three times, the pitch of the spiral screw blade.
    Those skilled in the art know that the block diagrams herein represent conceptual views of illustrative units or modules that implement the principles of the invention.
    Although the principles of the invention have been set forth above for specific embodiments, it is understood that this description is merely exemplary and should not be construed as limiting the scope of protection which is defined by the appended claims.
    权利要求:
    Claims (15)
    [1]
    Conclusions
    A developing unit adapted to work with a two-component developing material comprising carrier particles to which toner particles adhere; wherein the development unit comprises:
    a housing having an input and an output for connecting to a mixing fill module;
    at least one developing member rotatably mounted in a housing and adapted to transfer toner particles to a photoconductor element;
    a transport assembly adapted to transport toner particles to the at least one developing part or away from the at least one developing part;
    wherein the transport assembly comprises:
    at least one supply transport part rotatably mounted in the housing and adapted to transport toner particles from the entrance to the at least one developing part; which at least one feed conveyor part comprises a conveyor screw, the conveyor screw comprising a rod-shaped shaft, a spiral blade arranged around the shaft, and at least a first elongate element arranged at a distance from the shaft; and a discharge transport part, which is rotatably mounted in the housing and adapted to transport toner particles from the at least one developing part to the exit.
    [2]
    The developing unit according to claim 1, wherein the drain transport part comprises a drain transport screw, which is arranged in parallel with the at least one development part.
    [3]
    The developing unit of claim 2, wherein the output is aligned with an axial direction of the drain conveyor screw.
    [4]
    The developing unit according to claim 2 or 3, wherein the drain conveyor screw has a shaft and a variable-pitch helical blade, the pitch increasing in the drain direction of the drain conveyor part.
    [5]
    The developing unit according to any one of the preceding claims, wherein the at least one feed transport part comprises a first transport screw which is parallel to and above the transport screw with the first elongate element, the first transport screw being adapted to receive toner from the entrance.
    BE2017 / 5041
    [6]
    The developing unit of claim 5, wherein the input is aligned with an axial direction of the first conveyor screw.
    [7]
    The developing unit according to claim 5 or 6, wherein the first transport screw and the transport screw with the first elongate element rotate in the same direction.
    [8]
    The developing unit according to any of claims 5-7, wherein a trough with integrated cascade plate is located below the first transport screw, the first transport screw being arranged and arranged to transport toner from the entrance, over the cascade plate to the transport screw with the first elongated element.
    [9]
    The developing unit according to any one of the preceding claims, wherein the at least one feed conveyor part comprises at least one paddle wheel which is arranged downstream of the conveyor screw with the first elongate element, and upstream of the at least one developing part.
    [10]
    The developing unit according to any of the preceding claims, wherein the at least one developing member comprises a magnetic brush, which comprises a rotating sleeve, and at least one magnet part in the rotating sleeve.
    [11]
    The developing unit according to any of the preceding claims, wherein the first elongate element is arranged against an outer edge of the spiral screw blade; or wherein the first elongate element extends through the spiral screw blade.
    [12]
    The developing unit according to any of the preceding claims, wherein the first elongate element is arranged in parallel with the axis.
    [13]
    The developing unit according to any one of the preceding claims, wherein the first elongate element extends over at least 50 percent of the length of the helical screw blade, preferably over at least 80 percent, and more preferably over at least 90 percent.
    [14]
    The developing unit according to any of the preceding claims, wherein a plurality of elongated elements are arranged at a distance from the shaft, and wherein the plurality of elongated elements extend over at least 50 percent of the length of the spiral screw blade, preferably over at least 80 percent, and more preferably about at least 90 percent; wherein optionally a plurality of elongated elements are arranged at different distances from the axis; optionally the plurality of elongated elements being parallel to the axis
    BE2017 / 5041 applied; wherein an elongated element of the plurality of elongated elements is preferably arranged against an outer edge of the spiral screw blade or extends through the spiral screw blade.
    [15]
    The developing unit according to any of the preceding claims, wherein the elongate element
    5 is one of a straight bar or a curved bar, preferably a spirally curved bar.
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    同族专利:
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    US10001725B2|2018-06-19|
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    法律状态:
    2019-11-27| FG| Patent granted|Effective date: 20191023 |
    优先权:
    申请号 | 申请日 | 专利标题
    NL2016148A|NL2016148B1|2016-01-25|2016-01-25|Developing unit with improved conveying assembly.|
    NL2016148|2016-01-25|
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