摘要:
An apparatus which cleans particles from a tracking region on a photoconductive drum. A spacer maintains the spacing between the photoconductive drum and a developer roller substantially constant. The spacer contacts the photoconductive drum in the tracking region. The cleaning member, mounted on a transfer roller, removes particles adhering to the tracking region so as to ensure that there is no build up of particles in the tracking region changing the spacing between the photoconductive drum and the developer roller.
摘要:
A toner composition with a novel surface additive package for developing images. The additive package includes sol-gel silica, a PDMS silica, an organic spacer such as PMMA and two HMDS silicas. The toner composition exhibits improved control of voltage, higher print density, lower toner amount remaining on the roll, lower toner usage, and reduced drum contamination. The toner composition also exhibits improved dry rheological properties and improved fix properties. These improved properties make this toner composition useful for higher speed printing while using less toner.
摘要:
A system and method by which, in photoreceptor devices that use non-contact charging, an impending failure of a photoreceptor can be accurately estimated based on a determined thickness of a charge transport layer in the photoreceptor. The systems and methods may include measuring current delivered to the photoreceptor charge transport layer, measuring voltage of the photoreceptor transport layer, determining a slope of the charge device, determining the thickness of the charge transport layer based on at least one of the measured current value, voltage value, or charge device slope, and determining a photoreceptor replacement interval based on the determined thickness.
摘要:
A toner composition with a novel surface additive package for developing images. The additive package includes sol-gel silica, a PDMS silica, an organic spacer such as PMMA and HMDS silica. The toner composition exhibits improved control of voltage, higher print density, lower toner amount remaining on the roll, lower toner usage, and reduced drum contamination. The toner composition also exhibits improved dry theological properties. These improved properties make this toner composition useful for higher speed printing while using less toner.
摘要:
Exemplary embodiments provide charging systems and methods for effectively delivering charges onto a receptor. The charging system can include a low velocity gas stream, an emitter assembly for providing cathode-to-anode field bias to generate charges from the low velocity gas stream, and an emitter-to-receptor (e.g., photoreceptor) electric bias to enhance the charge delivery to the receptor. The disclosed charging systems and methods can be used to achieve an optimal charging performance at a low projected cost for any suitable receptor that needs to be charged. Exemplary receptors can include a photoreceptor (PR) such as a belt PR or a drum PR, a toner layer, a sheet of media on which toner can be deposited, or a transfer belt in an electrophotographic printing machine.
摘要:
An apparatus (100) and method (200) that senses photoreceptor failure in a xerographic printing apparatus is disclosed. The xerographic printing apparatus can include a rotatable photoreceptor (110) having a photoreceptor surface (111), a cleaning device (124) for removing marking material from the photoreceptor, and a printing apparatus controller (150) that controls operations of the xerographic printing apparatus. The method can include charging (220) the photoreceptor surface to a fixed voltage. The method can include discharging (230) at least a portion of the charged photoreceptor surface to an exposed voltage. The method can include developing (240) the discharged portion of the photoreceptor surface by providing a cleaning field between the charged photoreceptor surface fixed voltage and a developing bias voltage. The method can include reducing (250) the cleaning field. The method can include generating (260) a developed image on the photoreceptor using the reduced cleaning field. The method can include scanning (270) the developed image after reducing the cleaning field, where the developed image can be scanned using a sensor to generate a scanned image.
摘要:
In accordance with the invention, there are electron emitters, charging devices, and methods of forming them. An electron emitter array can include a plurality of nanostructures, each of the plurality of nanostructures can include a first end and a second end, wherein the first end can be connected to a first electrode and the second end can be positioned to emit electrons, and wherein each of the plurality of nanostructures can be formed of one or more of oxidation resistant metals, doped metals, metal alloys, metal oxides, doped metal oxides, and ceramics. The electron emitter array can also include a second electrode in close proximity to the first electrode, wherein one or more of the plurality of nanostructures can emit electrons in a gas upon application of an electric field between the first electrode and the second electrode.
摘要:
A xerographic marking engine adjusts a charging actuator value, such as an AC peak-to-peak voltage or an AC peak-to-peak current, based on a determined knee value, VKNEE, of a charge curve for an imaging apparatus photoreceptor within the xerographic marking engine and environmental sensor data. The environmental sensor data may measure environment temperature and environment humidity. In near A-zone environments, for example, operational environments in which the temperature is 80 degrees Fahrenheit and the relative humidity is 80%, the charging actuator value may be selected to achieve a predetermined photoreceptor wear rate that avoids print quality defects due to lateral charge migration. In other than A-zone environments, the charging actuator value may be selected to minimize the photoreceptor wear rate, while avoiding print quality defects. The described approach allows optimal photoconductor wear to be achieved, in all operational environments, without increasing the risk of print quality defects.
摘要:
The dielectric thickness of a photoreceptor is determined in a variety of ways, including using a relationship between threshold voltage and dielectric thickness, using a relationship between dielectric thickness and the difference between biased transfer roller (BTR) voltage and photoreceptor surface potential, using a relationship between dielectric thickness and biased charging roller (BCR) impedance, using a relationship between dielectric thickness and the slope of the DC current vs. voltage curve for the BTR or the BCR, and using a relationship between dielectric thickness and the BTR voltage at zero current. The threshold voltage can be found by using the slope of the BCR DC current vs. voltage curve, measuring photoreceptor surface potential for a plurality of target values below the charging knee to obtain the intercept value, or finding the actual value of the charging knee. A method of using the BCR as an electrodynamic voltmeter is also disclosed.
摘要:
This is a charging assembly that is useful in marking processes with an electrostatically charged surface. The assembly includes, besides the charger, a controller and an electric field probe. Charge and current flows can be detected by the probe and corrected immediately after detection of flaws by the probe and conveyed to the controller. If flaws in the charger are determined by the probe, corrections are made to the output by a controller; this is done before a final copy or print is made. The term flaws as used means any non-uniform appearing region in the printed image or any otherwise unacceptable defect. The probe is enabled to detect and indicate flaws and the controller which is in communication with the probe takes corrective action on the flaws. The probe used is a novel probe having two sensing elements surrounded by one or more reference electrodes.