WO2011137742A1 - 处理盒 - Google Patents
处理盒 Download PDFInfo
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- WO2011137742A1 WO2011137742A1 PCT/CN2011/073660 CN2011073660W WO2011137742A1 WO 2011137742 A1 WO2011137742 A1 WO 2011137742A1 CN 2011073660 W CN2011073660 W CN 2011073660W WO 2011137742 A1 WO2011137742 A1 WO 2011137742A1
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- WIPO (PCT)
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- toner
- developing roller
- photosensitive drum
- mandrel
- conductive sheet
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1839—Means for handling the process cartridge in the apparatus body
- G03G21/1867—Means for handling the process cartridge in the apparatus body for electrically connecting the process cartridge to the apparatus, electrical connectors, power supply
Definitions
- the present invention relates to a printing consumable, and more particularly to a process cartridge for a laser printer.
- the present invention is based on a Chinese patent application filed on May 5, 2010, the application number of which is incorporated herein by reference.
- Laser printers are common printing devices that provide great convenience for modern office use. Most of the existing laser printers use a process cartridge that is detachably mounted in a laser printer to provide toner for printing. During the printing process, the toner loaded in the process cartridge is transferred onto the paper as a printing medium to form a desired paper. Patterns and text.
- An existing type of process cartridge has a toner hopper containing toner and a waste toner hopper containing waste toner, and the structure of the process cartridge is as shown in FIG.
- the process cartridge has a housing 1 with a handle 15 for easy grasp by the user.
- the casing 1 of the process cartridge is composed of a drum frame 11, a toner hopper frame 12, and two end covers 13, 14, wherein the handle 15 is located on the drum frame 11.
- the toner hopper frame 12 has a toner hopper for accommodating toner, and a powder feed roller 21, a developing roller 25, and a powder discharging blade 31 are provided outside the toner hopper.
- the drum frame 11 has a waste toner box for accommodating waste toner, and a photosensitive drum 36, a charging roller 41, and a cleaning blade 48 are disposed outside the waste toner box.
- the drum frame 11 and the toner hopper frame 12 are fixedly connected by the end caps 13, 14 on both sides, and the drum frame 11, the toner hopper frame 12, and the end caps 13, 14 are enclosed in a cavity for powder feeding.
- Parts such as the roller 21, the developing roller 25, the powder discharging blade 31, the photosensitive drum 36, the charging roller 41, and the cleaning blade 48 are located in the cavity.
- the powder feeding roller 21 has a mandrel 22 made of metal.
- the mandrel 22 is surrounded by an elastic layer 23, and both ends of the mandrel 22 extend outside the elastic layer 23, and the powder feeding roller 21 is used for development.
- the roller 25 supplies toner and cleans the residual toner on the surface after development of the developing roller 25.
- a conductive piece 24 is attached to one end of the mandrel 22, and the conductive piece 24 extends outside the end cover 14.
- the conductive sheet 24 is in contact with the electrical contacts of the laser printer, and the laser printer supplies a voltage having a fixed voltage value to the conductive sheet 24 through the electrical contacts for eliminating a partial polarity charge in the toner and providing sufficient The electric field force of the developing bias.
- the developing roller 25 also has a mandrel 26 made of metal.
- the mandrel 26 is covered with an elastic layer 27, such as a sponge, rubber, etc., and one end of the mandrel 26 is also connected with a conductive sheet 28, which is outside the conductive sheet 28. The end extends beyond the end cap 14.
- the conductive sheet 28 is connected to another electrical contact of the laser printer to receive the supplied voltage from the laser printer. After the core shaft 26 of the developing roller 25 receives the voltage supplied from the laser printer, an electric field is formed in the vicinity thereof.
- the outer surface of the developing roller 25 is also electrostatically reacted with the toner for adsorbing the carbon powder on the outer surface of the developing roller 25.
- the powder discharging blade 31 is disposed in parallel with the developing roller 25, and has a holder 32 and a blade 33 mounted on the holder 32, and the blade 33 is elastically elastically pressed against the outer surface of the developing roller 25 for controlling carbon
- the thickness of the powder layer is evenly distributed on the surface of the developing roller, and a certain pressing force is also supplied to the developing roller 25 to rub the carbon powder to electrify it.
- One end of the holder 32 is connected to the conductive sheet 34, and one end of the conductive sheet 34 extends outside the end cover 14. After the process cartridge is mounted to the laser printer, the conductive sheet 34 is used to receive power from the laser printer.
- the photosensitive drum 36 is disposed in parallel with the axis of the developing roller 25, the outer surface of the photosensitive drum 36 is a photosensitive layer, and the toner on the outer surface of the developing roller 25 can be transferred to the outer surface of the photosensitive drum 36.
- a charging roller 41 is provided upstream thereof, and the charging roller 41 has a metal core 42 which is provided with a conductive layer 43 outside, and the conductive layer 43 is in contact with the outer surface of the photosensitive drum 36. And power is supplied to the photosensitive drum 36.
- One end of the mandrel 42 is provided with a bracket 44 on which a spring 45 is attached, and the spring 45 is connected to the conductive piece 46.
- the conductive sheet 46 is used to receive power from the laser printer, and a high voltage direct current is formed on the charging roller 41 to charge the photosensitive drum 36 to negatively charge the outer surface of the photosensitive drum 36.
- a cleaning blade 48 is provided downstream of the photosensitive drum 36 for scraping off the toner remaining on the outer surface of the photosensitive drum 36 after the transfer is completed.
- the toner on the outer surface of the developing roller 25 is transferred to the outer surface of the photosensitive drum 36 by an electric field force.
- the toner accommodated in the toner hopper is supplied to the outer surface of the developing roller 25 by the powder feeding roller 21, and the powder feeding roller 21 is continuously rotated during operation, and its rotation direction is as indicated by an arrow A1 in Fig. 4.
- the powder feeding roller 21 is adjacent to the outer surface of the developing roller 25, so that the toner adsorbed on the outer surface is transferred to the outer surface of the developing roller 25 during the rotation of the powder feeding roller 21, and the developing roller 25 is also continuously rotated during operation, and its rotation direction As shown by the arrow A2 in FIG.
- the excess carbon powder on the outer surface thereof is scraped off by the powder discharging blade 31, and the blade 33 scrapes off the excessively thick carbon powder adsorbed on the outer surface of the developing roller 25, thereby ensuring the toner on the outer surface of the developing roller 25.
- the thickness of the layer is such that the thickness of the carbon powder layer on the outer surface of the developing roller 25 is uniform.
- the powder knife 31 Since some toners may not be properly charged, or some of the toners have a negative charge, the powder knife 31 also needs to be negatively charged. When scraping excess toner, the negative charge on the blade needs to be transferred to the toner. Above, it is ensured that the toner on the outer surface of the developing roller 25 has a uniform negative charge.
- the charging roller 41 charges the photosensitive drum 36 to uniformly charge the outer surface of the photosensitive drum 36.
- the laser printer When the laser printer is in operation, the laser irradiates the surface of the photosensitive drum 36 with laser light with image information. This process is an exposure process, and a latent image is formed in a region where the surface of the photosensitive drum 36 is irradiated, that is, the charge in the exposed region disappears and is electrically neutral.
- the unexposed area on the photosensitive drum 36 is negatively charged and the exposed area is electrically neutral, an electric field is formed in the vicinity of the developing roller 25, and the direction of the electric field force is directed from the outer surface of the developing roller 25 toward the outer surface of the photosensitive drum 36, and outside the developing roller 25.
- the carbon powder on the surface is also negatively charged. According to the principle that the electric charge moves in the electric field, the carbon powder on the outer surface of the developing roller 25 is moved by the electric field force from the outer surface of the developing roller 25 to the exposed region on the photosensitive drum 36. Also, since the electric field force of the non-exposed area is higher than the developing bias, the toner of the outer surface of the developing roller 25 does not move to the non-exposed area of the outer surface of the photosensitive drum 36, and this process is a developing process.
- the paper as the printing medium passes under the photosensitive drum 36, the toner is transferred onto the paper, and the toner is heated and fixed on the paper, and the printing work is completed.
- the cleaning blade 48 scrapes off the toner remaining on the outer surface of the photosensitive drum 36, and the waste toner is collected into the waste toner compartment to avoid affecting the next printing duty cycle of the photosensitive drum 36.
- the voltage applied to the mandrel 26 of the developing roller 25 is adjusted correspondingly according to the characteristics of the toner. For example, a part of the toner particles are small or have a strong ability to acquire electric charges, and are easily transferred to the surface of the photosensitive drum 36 by the electric field force in the electric field generated by the existing developing roller 25, which requires lowering the supply roller 25 core.
- the voltage of the shaft 26 is adjusted correspondingly according to the characteristics of the toner.
- the voltage value of the laser printer applied to the developing roller 25 is fixed, and the toner having a small particle size or a strong charge-capturing ability may be transferred to the non-exposed area on the outer surface of the photosensitive drum 36, often resulting in formation on the non-exposed area of the photosensitive drum 36.
- a primary object of the present invention is to provide a process cartridge that can effectively avoid print quality problems.
- Another object of the present invention is to provide a process cartridge which prevents the occurrence of a gray bottom phenomenon.
- the present invention provides a process cartridge having a casing having a toner cartridge for containing toner, and a photosensitive drum, a charging roller for supplying power to the photosensitive drum, and transferring toner to the photosensitive film.
- a developing roller of the drum and a powder discharging knife for adjusting the thickness of the toner layer on the developing roller, wherein one end of the developing roller is provided with a first conductive sheet for supplying power to the developing roller, wherein a connection between the developing roller and the first conductive sheet is lowered Pressure device.
- the buck device is a resistor.
- the developing roller includes a mandrel and an elastic layer wrapped around the mandrel, the second conductive sheet abuts the shaft end of the mandrel, and the step-down device is welded between the first conductive sheet and the second conductive sheet.
- the invention can select the appropriate pressure reducing device according to the capacity of the processing cartridge to load the carbon particle size and the carbon powder to obtain the electric charge, thereby reducing the voltage value loaded on the developing roller, avoiding the phenomenon of gray bottom, improving the printing quality, and reducing the carbon. Waste of powder.
- Figure 1 is a structural view of a conventional process cartridge
- Figure 2 is a structural exploded view of a conventional process cartridge
- Figure 3 is a partially exploded enlarged view of a conventional process cartridge
- FIG. 4 is a schematic enlarged view showing the structure of a powder feeding roller, a developing roller, a powder discharging knife, a charging roller, a photosensitive drum, and a cleaning blade of the conventional process cartridge;
- Figure 5 is a partial structural view of the embodiment of the present invention after removing the housing
- Figure 6 is a partial structural view showing a developing roller and a resistor in the embodiment of the present invention.
- the process cartridge according to the present invention has a casing composed of a drum frame, a toner hopper frame, and two end caps, and the toner hopper frame has a toner hopper containing toner, which is the same as the existing process cartridge.
- the process cartridge is provided with components such as a powder feeding roller, a developing roller, a powder discharging knife, a charging roller, a photosensitive drum, and a cleaning blade.
- the powder feeding roller 51 has a mandrel 52 made of metal.
- the mandrel 52 is covered with an elastic layer 53. Outside the shaft end of the mandrel 52, a conductive sheet 54 is disposed, and the conductive sheet 54 extends outside the end cap.
- the laser printer supplies power to the conductive sheet 54, and the mandrel 52 receives the voltage from the laser printer so that the powder feed roller 51 eliminates the positive charge of the polar toner and generates a certain developing bias.
- the developing roller 56 is located at one side of the powder feeding roller 51, and the axis of the developing roller 56 is disposed in parallel with the axis of the powder feeding roller 51, and the outer surface of the developing roller 56 is adjacent to the outer surface of the powder feeding roller 51 so as to be outside the powder feeding roller 51.
- the toner of the surface is transferred to the outer surface of the developing roller 56.
- the powder discharging knife 61 is located above the developing roller 56 for controlling the thickness of the toner layer adsorbed on the developing roller 56.
- the powder discharging knife 61 has a blade holder 62 made of metal, and a blade 63 is mounted under the blade holder 62. The blade end of the blade 63 is in contact with the outer surface of the developing roller 56, and the excess toner adsorbed on the surface of the developing roller 56 can be scraped off. In order to control the thickness of the toner layer on the surface of the developing roller 56.
- One side of the developing roller 56 is provided with a photosensitive drum 68 whose axis is disposed in parallel with the axis of the developing roller 56.
- a charging roller 71 is provided above the photosensitive drum 68, and an axis of the charging roller 71 is disposed in parallel with the axis of the photosensitive drum 68.
- the outer surface of the charging roller 71 is in contact with the outer surface of the photosensitive drum 68 and is loaded with high voltage power to the outer surface of the photosensitive drum 68.
- the charging roller 71 has a mandrel 72 made of metal, and the mandrel 72 is covered with an elastic layer 73, and the outer surface of the elastic layer 73 is coated with a conductive material.
- One end of the mandrel 72 is sleeved with a bracket 74.
- the bracket 74 is provided with a spring 75.
- the spring 75 is connected with a conductive piece 76.
- the conductive piece 76 extends beyond the end cover of the process box, receives the voltage supplied by the laser printer, and allows A negative charge is formed on the elastic layer 73.
- a cleaning blade (not shown in Fig. 5) is positioned above the photosensitive drum 68 for scraping off the toner remaining on the outer surface of the photosensitive drum 68 after the transfer.
- the developing roller 56 has a mandrel 57 made of metal, and the mandrel 57 is externally wrapped with an elastic layer 58, and both ends of the mandrel 57 extend outside the elastic layer 58.
- a conductive sheet 60 is disposed outside the mandrel 57. The conductive sheet 60 extends beyond the end cap of the process cartridge and receives the voltage of the laser printer while the process cartridge is in operation.
- a conductive piece 59 is disposed at the axial end of the mandrel 57.
- the conductive piece 59 abuts on the axial end of the mandrel 57, and a resistor 81 as a step-down device is welded between the conductive piece 59 and the conductive piece 60, and one end of the resistor 81 is connected.
- 82 is soldered to the conductive sheet 60, and the other end 83 is soldered to the conductive sheet 59.
- the appropriate voltage value applied to the mandrel 57 of the developing roller 56 can be calculated according to the characteristics of the toner, such as the particle size of the toner, the ability to acquire the electric charge, etc., and according to the voltage value of the laser printer loaded on the conductive sheet 60,
- the resistance of the resistor 81 is calculated, and a suitable resistor 81 is selected to be soldered between the conductive sheet 60 and the conductive sheet 59.
- the resistor 81 is a resistor having an adjustable resistance value, and the resistance value of the resistor 81 can be adjusted according to actual conditions such as the characteristics of the toner, which is more advantageous for the operation of the process cartridge.
- the mandrel 57 of the developing roller 56 is provided with a suitable negative voltage, a suitable electric field can be formed in the vicinity of the developing roller 56, that is, the electric field force is reduced, and the toner having a small particle size is prevented from being adsorbed on the outer surface of the photosensitive drum 68.
- the non-exposed area effectively prevents the occurrence of the "gray bottom” phenomenon and improves the print quality. Moreover, unnecessary toner consumption can be avoided to avoid waste.
- the developing roller 56 spindle 57 is not directly connected to the conductive sheet 60, but is connected to the conductive sheet 60 through a step-down device, and the laser printer supplies the voltage of the conductive sheet 60.
- the core shaft 57 of the developing roller 56 is supplied to the developing roller 56 after being stepped down by the step-down device.
- the manufacturer of the process cartridge can calculate the appropriate voltage value to be applied to the mandrel 57 of the developing roller 56 based on the characteristics of the toner loaded in the process cartridge, thereby selecting a suitable step-down device based on the voltage applied to the conductive sheet 60 by the laser printer. .
- the process cartridge manufacturer adjusts the pressure drop value of the pressure reducing device according to the characteristics of the process cartridge toner, thereby preventing the carbon powder having a small particle size or strong adsorption capacity from being adsorbed on the non-exposed area on the outer surface of the photosensitive drum 68, thereby Prevent the occurrence of “grey bottom” phenomenon, avoid printing quality problems, and reduce the consumption of toner to avoid unnecessary waste.
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Description
本发明涉及一种打印耗材，尤其是一种用于激光打印机的处理盒。本发明基于申请日为2010年5月5日、申请号为201010163266.X的中国发明专利申请，该申请的内容作为参考引入本文。
激光打印机是常见的打印设备，为现代化办公提供极大的方便。现有的激光打印机大多使用可拆卸地安装到激光打印机内的处理盒提供打印使用的碳粉，在打印过程中，处理盒装载的碳粉转印在作为打印介质的纸张上，形成所需的图案和文字。
现有的一类处理盒具有容纳碳粉的碳粉仓以及容纳废碳粉的废粉仓，该类处理盒的结构如图1所示。
参见图1，处理盒具有一个壳体1，壳体1上设有一个手柄15，便于使用者把握。
参见图2，处理盒的壳体1由鼓框架11、碳粉仓框架12以及两个端盖13、14组成，其中手柄15位于鼓框架11上。碳粉仓框架12具有一个用于容纳碳粉的碳粉仓，在碳粉仓外设有送粉辊21、显影辊25、出粉刀31。
鼓框架11具有一个废粉仓，用于容纳废旧碳粉，废粉仓外设有感光鼓36、充电辊41以及清洁刮刀48。处理盒组装时，鼓框架11与碳粉仓框架12通过两侧的端盖13、14连接固定，并且鼓框架11、碳粉仓框架12以及端盖13、14围成一个腔体，送粉辊21、显影辊25、出粉刀31、感光鼓36、充电辊41以及清洁刮刀48等部件位于该腔体内。
参见图3，送粉辊21具有一根金属制成的芯轴22，芯轴22外包裹有弹性层23，芯轴22的两端延伸到弹性层23外，送粉辊21用于向显影辊25供给碳粉并对显影辊25显影后表面残留碳粉进行清洁。在芯轴22的一端连接有一导电片24，导电片24延伸到端盖14外。处理盒安装到激光打印机后，导电片24与激光打印机的电触点接触，激光打印机通过电触点向导电片24提供电压值固定的电压，用于消除碳粉中部分极性电荷及提供足够的显影偏压的电场力。
类似地，显影辊25也具有一根金属制成的芯轴26，芯轴26外包裹有弹性层27，如海绵、橡胶等，芯轴26的一端也连接有导电片28，导电片28外端延伸到端盖14外。导电片28与激光打印机的另一电触点连接，接收来自激光打印机的供给的电压。显影辊25的芯轴26接收激光打印机供给的电压后，在其附近形成电场。处理盒工作时，显影辊25外表面还会与碳粉产生静电作用，用于将碳粉吸附在显影辊25外表面上。
出粉刀31与显影辊25平行设置，其具有一个刀架32以及安装在刀架32上的刀片33，刀片33沿轴向弹性地抵压在显影辊25的外表面上，用于控制碳粉层厚度在显影辊表面均匀分布，还向显影辊25提供一定的挤压力，以摩擦碳粉使其带电。刀架32的一端与导电片34连接，导电片34的一端延伸到端盖14外。处理盒安装到激光打印机后，导电片34用于接收激光打印机供电。
感光鼓36与显影辊25的轴线平行设置，感光鼓36的外表面为感光层，显影辊25外表面的碳粉可转移到感光鼓36的外表面。
按感光鼓36的工作转向看，其上游设有充电辊41，充电辊41具有金属制成的芯轴42，芯轴42外设有导电层43，导电层43与感光鼓36的外表面接触并向感光鼓36供电。芯轴42的一端套装有一个支架44，支架44上安装有弹簧45，弹簧45与导电片46连接。处理盒安装到激光打印机后，导电片46用于接收激光打印机供电，并使充电辊41上形成高压直流电，从而向感光鼓36充电，使感光鼓36外表面带负电。
感光鼓36的下游设有清洁刮刀48，用于刮除转印完毕后残留在感光鼓36外表面的碳粉。
参见图4，显影辊25外表面的碳粉通过电场力转移到感光鼓36的外表面。激光打印机工作时，容纳在碳粉仓内的碳粉通过送粉辊21供给到显影辊25外表面，送粉辊21工作时不断旋转，其旋转方向如图4中箭头A1所示。
送粉辊21与显影辊25的外表面邻接，因此在送粉辊21旋转过程中将吸附在外表面的碳粉转移到显影辊25的外表面，显影辊25工作时也不断旋转，其旋转方向如图4中箭头A2所示。显影辊25旋转过程中，其外表面多余的碳粉将经过出粉刀31的刮除，刀片33刮除吸附在显影辊25外表面过厚的碳粉，从而确保显影辊25外表面碳粉层的厚度，使显影辊25外表面碳粉层厚度均匀。
由于部分碳粉会不适当地带上正电荷，或者部分碳粉所带负电荷不足，因此出粉刀31也需要带负电，刮除多余碳粉时，需要将刀片上的负电荷转移到碳粉上，确保显影辊25外表面碳粉带有均匀的负电荷。
另一方面，充电辊41向感光鼓36充电，使感光鼓36外表面均匀地带负电。激光打印机工作时，激光器向感光鼓36表面照射带有图像信息的激光，此过程为曝光过程，在感光鼓36表面被照射的区域形成潜影，即曝光区域电荷消失，呈电中性。
由于感光鼓36上未曝光区域带负电，而曝光区域为电中性，显影辊25附近形成电场，电场力的方向是从显影辊25外表面指向感光鼓36的外表面，且显影辊25外表面的碳粉也带负电，根据电荷在电场中运动的原理，显影辊25外表面的碳粉，将在电场力的作用下由显影辊25外表面移动到感光鼓36上曝光区域。并且，由于非曝光区域的电场力高于的显影偏压，因此显影辊25外表面的碳粉不会移动到感光鼓36外表面的非曝光区域，此过程为显影过程。
最后，作为打印介质的纸张从感光鼓36下方经过，碳粉将转印到纸张上，碳粉经过加热后定影在纸张上，打印工作完成。
感光鼓36完成转印过程后，清洁刮刀48将刮除残留在感光鼓36外表面的碳粉，废粉被收集进入废粉仓，避免影响感光鼓36的下一打印工作周期。
由于不同碳粉的颗粒大小不同，且不同碳粉获取电荷的能力不尽相同，这要求加载在显影辊25芯轴26上的电压根据碳粉的特性进行相应调整。例如，部分碳粉颗粒较小，或者获取电荷能力较强，在现有显影辊25产生的电场中电场力的作用下，较容易转移至感光鼓36的表面，这需要降低供给显影辊25芯轴26的电压。
但是，激光打印机向显影辊25加载的电压值固定，颗粒较小或获取电荷能力较强的碳粉有可能转移到感光鼓36外表面非曝光区域，往往导致感光鼓36的非曝光区域上形成一层薄薄的碳粉层，碳粉层转印至纸张后，形成“灰底”现象，影响打印质量，并且还会造成碳粉的浪费，给使用者带来经济损失。
本发明的主要目的是提供一种能有效避免打印质量问题的处理盒。
本发明的另一目的是提供一种防止灰底现象产生的处理盒。
为实现上述的主要目的，本发明提供的处理盒具有壳体，壳体具有容纳碳粉的碳粉仓，壳体内还设置有感光鼓、向感光鼓供电的充电辊、将碳粉传递至感光鼓的显影辊以及用于调整显影辊上碳粉层厚度的出粉刀，显影辊的一端设有向显影辊供电的第一导电片，其中，显影辊与第一导电片之间连接有一降压器件。
一个优选的方案是，降压器件为电阻。
进一步的方案是，显影辊包括芯轴以及包裹在芯轴外的弹性层，第二导电片抵接在芯轴的轴端，降压器件焊接在第一导电片与第二导电片之间。
本发明能根据处理盒装载碳粉颗粒大小及碳粉获取电荷的能力，选取合适的降压器件，从而降低加载在显影辊上的电压值，避免造成灰底现象，提高打印质量，也减少碳粉的浪费。
图1是现有一种处理盒的结构图；
图2是现有处理盒的结构分解图；
图3是现有处理盒的局部分解放大图；
图4是现有处理盒的送粉辊、显影辊、出粉刀、充电辊、感光鼓及清洁刮刀的结构放大示意图；
图5是本发明实施例去除壳体后的局部结构图；
图6是本发明实施例中显影辊与电阻的局部结构图。
以下结合各实施例及其附图对本发明作进一步说明。
根据本发明的处理盒具有壳体，壳体由鼓框架、碳粉仓框架以及两个端盖组成，且碳粉仓框架具有容纳碳粉的碳粉仓，这些与现有的处理盒相同。
在壳体内，处理盒设有送粉辊、显影辊、出粉刀、充电辊、感光鼓以及清洁刮刀等部件。
参见图5，送粉辊51具有金属制成的芯轴52，芯轴52外包裹有弹性层53，在芯轴52的轴端外设置有导电片54，导电片54延伸到端盖外。处理盒工作时，激光打印机向导电片54供电，芯轴52接收来自激光打印机的电压，以便送粉辊51消除极性碳粉的正电荷，并产生一定的显影偏压。
显影辊56位于送粉辊51的一侧，且显影辊56轴线与送粉辊51的轴线平行设置，显影辊56的外表面与送粉辊51的外表面邻接，以便将送粉辊51外表面的碳粉传递至显影辊56的外表面。
出粉刀61位于显影辊56的上方，用于控制吸附在显影辊56上碳粉层的厚度。出粉刀61具有金属制成的刀架62，刀架62下方安装有刀片63，刀片63的刃端与显影辊56的外表面接触，可刮除吸附在显影辊56表面上多余的碳粉，以便控制显影辊56表面碳粉层的厚度。
显影辊56的一侧设有感光鼓68，感光鼓68的轴线与显影辊56的轴线平行设置。
感光鼓68上方设有充电辊71，且充电辊71的轴线与感光鼓68的轴线平行设置。充电辊71的外表面与感光鼓68外表面接触并向感光鼓68外表面加载高压电。
充电辊71具有一根金属制成的芯轴72，芯轴72外包裹有弹性层73，弹性层73外表面涂有导电材料。芯轴72的一端套有支架74，支架74上套装有弹簧75，弹簧75与一导电片76连接，其中导电片76延伸到处理盒的端盖外，接收激光打印机的供给的电压，并使弹性层73上形成负电。
清洁刮刀（图5中未示）位于感光鼓68的上方，用于刮除转印后残留在感光鼓68外表面的碳粉。
参见图6，显影辊56具有金属制成的芯轴57，芯轴57外包裹有弹性层58，芯轴57的两端延伸到弹性层58外。芯轴57外设有导电片60，导电片60延伸到处理盒的端盖外，且在处理盒工作时接收激光打印机的电压。
在芯轴57的轴端设有导电片59，导电片59抵接在芯轴57的轴端，且导电片59与导电片60之间焊接有作为降压器件的电阻81，电阻81的一端82焊接在导电片60上，另一端83焊接在导电片59上。
由此可见，可根据碳粉的特性，如碳粉颗粒大小、获取电荷能力等，计算加载在显影辊56芯轴57的合适电压值，并根据激光打印机加载在导电片60上的电压值，计算电阻81的阻值，并选取合适的电阻81焊接在导电片60与导电片59之间。
优选地，电阻81为电阻值可调的电阻，可根据碳粉特性等实际情况调节电阻81的电阻值，更有利于处理盒的工作。
激光打印机工作时，由于显影辊56的芯轴57带合适的负电压，因此能在显影辊56附近形成合适的电场，即降低电场力，避免颗粒较小的碳粉吸附在感光鼓68外表面非曝光区域上，有效防止“灰底”现象的产生，提高打印质量。并且，还能避免不必要的碳粉消耗，从而避免浪费。
当然，上述方案仅是本发明较佳的实施方案，实际应用时，还可以有更多的变化，例如使用专用的降压电路替代电阻作为降压器件；或者，将一弹簧套装在显影辊芯轴的一端，电阻的一端焊接在弹簧上、另一端焊接在导电片60上等，这些改变并不影响本发明的实施。
最后需要强调的是，本发明不限于上述实施方式，如降压器件的改变、降压器件连接位置的改变等微小的变化也应该包括在本发明权利要求的保护范围内。
与现有技术相比，本发明提供的处理盒中，显影辊56芯轴57未直接与导电片60连接，而是通过一降压器件与导电片60连接，激光打印机供给导电片60的电压经过降压器件的降压后供给显影辊56的芯轴57。这样，处理盒的生产厂家可根据处理盒装载的碳粉特性，计算向显影辊56的芯轴57加载的合适电压值，从而根据激光打印机向导电片60加载的电压计算选用合适的降压器件。可见，处理盒生产厂家根据处理盒碳粉的特性调节降压器件的降压值，可防止颗粒较小或吸附电荷能力较强的碳粉吸附在感光鼓68外表面的非曝光区域上，从而防止“灰底”现象的产生，避免造成打印质量问题，同时也减少碳粉的消耗，避免造成不必要的浪费。
Claims (6)
- 处理盒，包括壳体，所述壳体具有容纳碳粉的碳粉仓，所述壳体内还设置有感光鼓、向所述感光鼓供电的充电辊、将碳粉传递至感光鼓的显影辊以及用于调整所述显影辊上碳粉层厚度的出粉刀，所述显影辊的一端设有向所述显影辊供电的第一导电片；其特征在于：所述显影辊与所述第一导电片之间连接有一降压器件。
- 据权利要求1所述的处理盒，其特征在于：所述降压器件为电阻。
- 据权利要求2所述的处理盒，其特征在于：所述电阻为电阻值可调电阻。
- 据权利要求1所述的处理盒，其特征在于：所述降压器件为降压电路。
- 据权利要求1至4任一项所述的处理盒，其特征在于：所述显影辊包括芯轴以及包裹在所述芯轴外的弹性层，第二导电片抵接在所述芯轴的轴端；所述降压器件焊接在所述第一导电片与所述第二导电片之间。
- 据权利要求1至4任一项所述的处理盒，其特征在于：所述显影辊包括芯轴以及包裹在所述芯轴外的弹性层，一弹簧套装在所述芯轴的轴端上；所述降压器件焊接在所述弹簧与所述第一导电片之间。
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| CN101893838B (zh) * | 2010-05-05 | 2012-06-06 | 珠海天威飞马打印耗材有限公司 | 处理盒 |
| CN202512365U (zh) * | 2012-03-20 | 2012-10-31 | 珠海市奔码打印耗材有限公司 | 一种显影装置 |
| CN205038440U (zh) * | 2015-07-17 | 2016-02-17 | 中山鑫威打印耗材有限公司 | 一种动力传递装置 |
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