WO2012109838A1 - 激光打印机的显影装置 - Google Patents

激光打印机的显影装置 Download PDF

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Publication number
WO2012109838A1
WO2012109838A1 PCT/CN2011/076082 CN2011076082W WO2012109838A1 WO 2012109838 A1 WO2012109838 A1 WO 2012109838A1 CN 2011076082 W CN2011076082 W CN 2011076082W WO 2012109838 A1 WO2012109838 A1 WO 2012109838A1
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WO
WIPO (PCT)
Prior art keywords
photosensitive drum
developing roller
roller
developing
laser printer
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Application number
PCT/CN2011/076082
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English (en)
French (fr)
Inventor
曹国柱
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珠海市奔码打印耗材有限公司
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Publication of WO2012109838A1 publication Critical patent/WO2012109838A1/zh

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    • 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
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0813—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by means in the developing zone having an interaction with the image carrying member, e.g. distance holders
    • 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
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush

Definitions

  • the present invention relates to a toner cartridge for a laser printer, and more particularly to a developing device in a toner cartridge.
  • Contact development is one of the main development methods for laser printing. Most of the laser printers such as Samsung and Brother have adopted this development method. Color printers such as Hewlett-Packard and Canon have also adopted this technology.
  • the powder feeding roller is often made of a porous material having a certain resistance.
  • the feed roller is fed with a voltage of about -500 volts, the toner can be made to be negatively charged.
  • the developing roller is mostly a metal core rubber roller and has a large body resistance. When a voltage of -300 V is applied thereto, the charged toner on the powder supply roller is transferred to a developing roller having a relatively high potential.
  • the elastic metal scraper maintains a very small gap with the developing roller, which is also applied with an alternating voltage that activates the toner and scrapes it into a uniform, thin layer in constant oscillation.
  • the photosensitive drum can be obtained under the action of a charging roller -1400V high pressure - At a surface voltage of 800V, the potential of the pattern portion after exposure drops to –50V (this is the residual potential), while the non-graphic portion (white area) remains at –800V, approximately on the developing roller – 300V toner is rejected by –800V, but can be - 50V attracts and develops, this is the development process.
  • This development method requires the photosensitive drum to be in direct contact with the developing roller, which has a large damage to the photosensitive drum, a large rotating torque, and high precision requirements of each component, resulting in high manufacturing cost and unstable printing quality.
  • the present invention provides a developing device for a laser printer having a small torque, high operational stability, and low cost.
  • a developing device for a laser printer comprising a photosensitive drum disposed in a toner cartridge and a developing roller capable of adhering magnetic carbon powder on the surface, wherein: the photosensitive drum is provided with at least one permanent magnet, and the magnetic toner adhered to the surface of the developing roller Can be attached to the surface of the photosensitive drum by permanent magnet action, And the distance d between the photosensitive drum and the developing roller is 0 ⁇ d ⁇ 0.4 mm.
  • the distance d between the photosensitive drum and the developing roller was 0.2 mm.
  • the developing roller may be a rubber roller.
  • the developing roller may be an aluminum roller.
  • An advantageous effect of the present invention is that at least one permanent magnet is provided in the photosensitive drum of the present invention, and magnetic carbon powder adhering to the surface of the developing roller can be attached to the surface of the photosensitive drum through a permanent magnet. Therefore, in the developing device of the present configuration, the developing roller and the photosensitive drum can be developed without contact, thereby avoiding wear and large rotational torque caused by mutual contact, and at the same time reducing the manufacturing precision of each component, thereby reducing the manufacturing cost and improving the manufacturing cost. The print quality.
  • Figure 1 is a schematic view showing the entire structure of the present invention.
  • the present invention discloses a developing device for a laser printer, comprising a photosensitive drum 1 disposed in a toner cartridge and a developing roller 2 having a surface capable of attaching magnetic carbon powder 3, wherein the photosensitive drum 1 is provided with at least one permanent magnet 4,
  • the magnetic carbon powder 3 adhering to the surface of the developing roller 2 can be attached to the surface of the photosensitive drum 1 by the action of the permanent magnet 4, and the distance d between the photosensitive drum and the developing roller is 0 ⁇ d ⁇ 0.4 mm.
  • a permanent magnet 4 is disposed in the photosensitive drum 1, and the permanent magnet 4 is located directly below the photosensitive drum 1.
  • the above position is only a preferred position of the embodiment, and of course
  • the magnet 4 may also be located at other positions in the photosensitive drum 1 capable of attracting the magnetic toner 3, and the developing roller 2 is disposed directly under the photosensitive drum 1, and the distance between the photosensitive drum 1 and the developing roller 2 is 0.2 mm, of course, in the present invention
  • the distance between the photosensitive drum 1 and the developing roller 2 may be any value from 0 to 0.4 mm
  • the developing roller 2 employs a rubber roller
  • the developing roller 2 is further provided with a powder feeding roller 5 and a powder container 6 and a powder container.
  • the magnetic toner 3 is contained in the inside of the toner cartridge 3, and an elastic metal scraper which is in contact with the developing roller 2 is disposed in the toner cartridge.
  • the developing roller 2 is an aluminum roller, and the developing roller 2 is in contact with the elastic metal scraper.
  • the metal scraper is only in the structure.
  • the structure can also be made of an elastic rubber scraper.
  • the above description is merely illustrative of some embodiments, but the embodiments of the present invention are not limited by the above embodiments.
  • the developing roller 2 of the present invention may also employ a magnetic roller or the like.
  • the working process of the apparatus is as follows: the magnetic toner 3 is adsorbed from the powder magazine 6 to the developing roller 2 by the powder feeding roller 5, and the blade contacting the developing roller 2 scrapes the magnetic toner 3 into a uniform thin layer and The magnetic toner 3 is charged, and a voltage of about 300 is applied to the developing roller 2, and this voltage can ensure that the charged magnetic toner 3 can be adsorbed to the surface of the developing roller 2 to prevent the occurrence of "flying powder".
  • the magnetic toner 3 When the magnetic toner 3 is driven to a certain position by the developing roller 2, it is attracted by the attraction of the permanent magnet 4 fixed in the photosensitive drum 1 to overcome the electric field force on the developing roller, and jumps to the surface of the photosensitive drum 1 due to the surface of the photosensitive drum
  • the non-pattern area has a high charge and the same electric charge as that of the magnetic toner, and the charge of the magnetic toner has a large repulsive force to cancel the permanent magnet and the magnetic toner.
  • the magnetic force generated, so that the magnetic carbon powder can not be adsorbed on the non-pattern area of the photosensitive drum surface; but the voltage of the pattern area after exposure is very low, the generated electric field force cannot overcome the magnetic field force, and thus the magnetic toner 3 is exposed to light.
  • the pattern area on the surface of the photosensitive drum 1 can be uniformly adsorbed to form development.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Description

激光打印机的显影装置
技术领域
本发明涉及一种激光打印机的硒鼓，特别是一种硒鼓中的显影装置。
背景技术
接触式显影方式是激光打印的其中一种主要的显影方式。三星和兄弟等激光打印机大多采用了这种显影方式，惠普、佳能等彩色打印机也采用了此种技术。
以三星为例，通常有一个较大的粉仓，内用搅拌架把碳粉连续不断地输送给送粉辊，由于显影辊必须靠送粉辊连续转动把碳粉送到其上面。因此送粉辊多用有一定阻值的多孔材料做成。当给送粉辊以约-500v的电压时，即能使碳粉感生出负电性。显影辊多为金属芯胶辊，有很大的体电阻，给其施以-300v的电压时，供粉辊上的带电碳粉就会转移到相对电位高的显影辊上来。弹性金属刮刀与显影辊保持极小的间隙，它也被施以一个交变电压，可以在不断的震荡中使碳粉激活并将其刮成均匀的很薄的一层。而感光鼓在充电辊-1400V高压作用下能得到- 800V的表面电压，曝光后图形部分电位降至–50V(这是残余电位)，而非图形部分(白区)仍保持–800V电位，显影辊上约– 300V的墨粉被–800V排斥，却能被- 50V吸引而显像，此即显影过程。这种显影方式要求感光鼓与显影辊直接接触，对感光鼓的损伤较大，转动扭矩也大，同时各部件精度要求高导致制作成本高，打印品质也不稳定。
发明内容
为了克服现有技术的不足，本发明提供一种扭矩小，工作稳定性高，成本低的激光打印机的显影装置。
本发明解决其技术问题所采用的技术方案是：
激光打印机的显影装置，包括设置于硒鼓内的感光鼓及表面能够附着磁性碳粉的显影辊，其特征在于：所述感光鼓内设有至少一条永磁体，附着在显影辊表面的磁性碳粉能够通过永磁体作用附着于感光鼓表面, 且感光鼓与显影辊的间距d为0＜d＜0.4mm。
感光鼓与显影辊的间距d为0.2mm。
所述显影辊可为橡胶辊。
所述显影辊可为铝辊。
本发明的有益效果是：本发明的感光鼓内设置了至少一条永磁体，附着在显影辊表面的磁性碳粉能够通过永磁体附着于感光鼓表面。因此本结构的显影装置中显影辊及感光鼓不必接触就能够实现显影，避免了相互接触所带来的磨损和大的转动扭矩，同时降低了各部件的制造精度从而也降低了制作成本，提高了打印品质。
附图说明
下面结合附图和实施例对本发明进一步说明。
图1是本发明的整体结构示意图。
具体实施方式
参照图1，本发明公开了一种激光打印机的显影装置，包括设置于硒鼓内的感光鼓1及表面能够附着磁性碳粉3的显影辊2，感光鼓1内设有至少一条永磁体4，附着在显影辊2表面的磁性碳粉3能够通过永磁体4作用附着于感光鼓1表面，且感光鼓与显影辊的间距d为0＜d＜0.4mm。
如图所示，于本实施例中，感光鼓1内设有一条永磁体4，该永磁体4位于感光鼓1内的正下方，上述位置仅仅是本实施例的一个优选位置，当然该永磁体4也可位于感光鼓1内能够吸引磁性碳粉3的其它位置，感光鼓1的正下方设置有显影辊2，感光鼓1与显影辊2的间距为0.2mm，当然，在本发明中感光鼓1与显影辊2的间距为可以为0到0.4mm中的任一数值，显影辊2采用了橡胶辊，显影辊2的下方还设有一个送粉辊5及粉仓6，粉仓6内装有磁性碳粉3，硒鼓内设有一与显影辊2接触的弹性金属刮刀。
以下是本发明的另一实施例，该实施例与上一个实施例不同之处在于，显影辊2采用了铝辊，与显影辊2接触的可为弹性金属刮刀，当然金属刮刀只是本结构中的优选，该结构也可用弹性橡胶刮刀。
当然，上述仅仅是对部分实施例进行了图示和描述，但本发明的实施方式并不受上述实施例的限制，比如说本发明的显影辊2还可以采用磁辊等。
本装置的工作过程如下：磁性碳粉3通过送粉辊5从粉仓6吸附到显影辊2上，与显影辊2接触的刮刀将磁性碳粉3刮成均匀的很薄的一层并使磁性碳粉3带上电荷，在显影辊2的上加有一个值为300左右电压，此电压能够保证带电的磁性碳粉3能够吸附到显影辊2表面，防止”飞粉”的情况发生。
当磁性碳粉3被显影辊2带动到一定的位置时，受感光鼓1内固定不动的永磁体4的吸引从而克服显影辊上电场力的约束跳到感光鼓1表面，因感光鼓表面非图形区具有很高的、且电性与磁性碳粉所带电荷电性相同的电荷，其与磁性碳粉所带电荷相互间会产生很大的排斥力从而抵消了永磁体与磁性碳粉产生的磁场力，而使磁性碳粉不能吸附在感光鼓表面非图形区；但曝光后的图形区的电压很低，所产生的电场力无法克服磁场力的作用，因而磁性碳粉3在感光鼓1转动的过程中能够均匀吸附在感光鼓1表面的图形区形成显影。
上述只是对本发明的一些优选实施例进行了图示和描述，但本发明的实施方式并不受上述实施例的限制，只要其以基本相同的手段达到本发明的技术效果，都应属于本发明的保护范围。

Claims (4)

  1. 激光打印机的显影装置，包括设置于硒鼓内的感光鼓及表面能够附着磁性碳粉的显影辊，其特征在于：所述感光鼓内设有至少一条永磁体，附着在显影辊表面的磁性碳粉能够通过永磁体作用附着于感光鼓表面, 且感光鼓与显影辊的间距d为0＜d＜0.4mm。
  2. 根据权利要求1所述的激光打印机的显影装置，其特征在于：感光鼓与显影辊的间距d为0.2mm。
  3. 根据权利要求1或2所述的激光打印机的显影装置，其特征在于：所述显影辊可为橡胶辊。
  4. 根据权利要求1或2所述的激光打印机的显影装置，其特征在于：所述显影辊可为铝辊。
PCT/CN2011/076082 2011-02-18 2011-06-22 激光打印机的显影装置 WO2012109838A1 (zh)

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Publication number Priority date Publication date Assignee Title
CN102073250A (zh) * 2011-02-18 2011-05-25 珠海市奔码打印耗材有限公司 激光打印机的显影装置
CN111856906A (zh) * 2020-08-25 2020-10-30 广州欣彩电脑耗材有限公司 一种可调节送粉辊扭矩的硒鼓

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JPH0736321A (ja) * 1993-07-26 1995-02-07 Matsushita Electric Ind Co Ltd 電子写真装置
JPH08137158A (ja) * 1994-11-02 1996-05-31 Matsushita Electric Ind Co Ltd 電子写真装置
CN101464649A (zh) * 2007-12-21 2009-06-24 夏普株式会社 成像设备
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CN201945809U (zh) * 2011-02-18 2011-08-24 珠海市奔码打印耗材有限公司 激光打印机的显影装置

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JPH0736321A (ja) * 1993-07-26 1995-02-07 Matsushita Electric Ind Co Ltd 電子写真装置
JPH08137158A (ja) * 1994-11-02 1996-05-31 Matsushita Electric Ind Co Ltd 電子写真装置
CN101464649A (zh) * 2007-12-21 2009-06-24 夏普株式会社 成像设备
CN102073250A (zh) * 2011-02-18 2011-05-25 珠海市奔码打印耗材有限公司 激光打印机的显影装置
CN201945809U (zh) * 2011-02-18 2011-08-24 珠海市奔码打印耗材有限公司 激光打印机的显影装置

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