Lexmark International, Inc.

Mark Kevin DeMoor

John William Kietzman

Gregory Hardin McClure

William Paul Cook

Gregory Lawrence Ream

Jerry Wayne Smith

Steven Jeffrey Harris

Calvin Dale Murphy

Pramod K Sharma

Todd Alan Dutton

William Alan Menk, Jr

Lawrence G Teply

An image transfer assembly in a color printer or the like includes four image forming units. Each of the image forming units includes a photoconductive unit and a transfer device. A voltage is applied to the transfer device thereby creating a voltage potential between the photoconductive unit and the transfer device to facilitate the transfer of toner to a media substrate, such as paper. The transfer devices in the first two image forming units share a single high voltage power supply while separate high voltage power supplies supply the necessary voltage to the transfer devices of the other two image forming units.

Shared high voltage power supply for image transfer in an image forming device

A power supply control system for a fuser assembly in an electrophotographic apparatus includes a power supply and a fuser assembly. The power supply includes a first electrical path designated for a fuser assembly that operates at a first voltage and a second electrical path designated for a fuser assembly that operates at a second voltage. The fuser assembly is configured to operate at a select one of the first voltage or the second voltage and is connected to the first electrical path if the fuser assembly operates at the first voltage, and the fuser assembly is connected to the second electrical path if the fuser assembly operates at the second voltage. The first and second electrical paths allow different device features including power limiting devices such as fuses, switches, relays, etc., to be placed in each path.

Electrophotographic power supply configuration for supplying power to a fuser

An image forming device and method of detecting the presence or absence of components of one or more image forming units. Each image forming unit includes a replaceable component. A power supply transmits an input signal to the replaceable component. A detection circuit is coupled to the replaceable component and generates an output signal indicative of the presence or absence of an electrical coupling that is established when the replaceable component is installed. The detection circuit thus senses the input signal propagating through the replaceable component. A controller may be adapted to halt image formation or generate an error indication if the detection circuit detects the absence of necessary components or the presence of components not necessary for a current mode of operation.

Development component detection in an electrophotographic device

A resistive heater adapted for heating a fuser belt is provided. The heater comprises a substrate, a first resistive trace formed over the substrate, and a second resistive trace formed so as to at least partially overlap the first resistive trace.

Resistive heater comprising first and second resistive traces, a fuser subassembly including such a resistive heater and a universal heating apparatus including first and second resistive traces

A plurality of universal fuser heating apparatus embodiments are provided, each of which is capable of receiving any one of a number of input AC line voltages falling within at least two AC line voltage ranges. In each embodiment, the fuser heating apparatus has a first, low effective resistance corresponding to AC line voltages falling within low AC line voltage ranges and a second, high effective resistance corresponding to AC line voltages falling within high AC line voltage ranges.

Universal fuser heating apparatus with effective resistance switched responsive to input AC line voltage

An ink jet printhead voltage fault protection apparatus includes a power supply and a latching circuit. The latching circuit disables a printhead voltage applied to the printhead by the power supply upon detection of a fault condition associated with the printhead voltage such that the printhead voltage remains disabled until the power supply goes through a power-on reset sequence.

Growing community of inventors

Nicholasville, KY, United States of America

Mark Kevin DeMoor