摘要:
A phase locked loop type frequency synthesizer utilizing a reference signal source includes a voltage controlled oscillator (VCO), a phase comparator, a programmable pre-scaler and a modulator. The programmable pre-scaler divides the output of the VCO according to a sequence of divide ratios to produce a divided signal having a frequency approximating the reference signal frequency. The phase comparator compares the phases of the divided signal and the reference signal and, in response to a difference, adapts the VCO to reduce the detected difference. The modulator provides a next value in the sequence of divide ratios by accumulating an error between a present value and an average value in the sequence of divide ratios, accumulating the accumulated error values, and determining the next value in the sequence of divide ratios such that the multiply-accumulated error values are maintained within finite bounds.
摘要:
A printing device has an image receptor adapted to have an image formed thereon. The printing device also includes a transfer roller and a motor. A transfer roller load mechanism moves the transfer roller into contact with the image receptor in response to the motor output. A controller manipulates the motor in conjunction with a feedback signal from a load detector and regulates the load of the transfer roller.
摘要:
A printing device has an image receptor adapted to have an image formed thereon. The printing device also includes a transfer roller and a motor. A transfer roller load mechanism moves the transfer roller into contact with the image receptor in response to the motor output. A controller manipulates the motor in conjunction with a feedback signal from a load detector and regulates the load of the transfer roller.
摘要:
A method detects the level of ink in a printhead reservoir by monitoring the power drawn by a thermistor positioned within the printhead reservoir. The method includes dissipating power in a thermistor in an ink reservoir, controlling the power dissipated in the thermistor to maintain the thermistor at a temperature that is a fixed differential above a reservoir temperature, measuring a parameter that corresponds to the power dissipated in the thermistor, and comparing the measured parameter to a predetermined value to detect ink in the reservoir contacting the thermistor.
摘要:
An inkjet ejector provides electrical conductors for grounding electrically isolated layers in the ejector while electrically coupling a transducer of the ejector to a firing signal circuit. The inkjet ejector includes a diaphragm plate have a first side and a second side, a plurality of transducers mounted to the first side of the diaphragm plate, a polymer layer located on the second side of the diaphragm plate, an electrically conductive layer that is isolated from electrical ground by the polymer layer, and a plurality of electrical conductors, at least one of the electrical conductors extends from the electrically conductive layer to electrical ground through the polymer layer and other electrical conductors of the plurality of electrical conductors extend from each transducer to a firing signal circuit, the electrical conductor extending from the electrically conductive layer being the same material as the other electrical conductors in the plurality of electrical conductors.
摘要:
A method responds to an over-temperature condition in a printhead. The method includes generating a first electrical signal corresponding to a temperature in a printhead, monitoring the first electrical signal with a first electronic circuit to terminate delivery of electrical power to a printhead in response to detection of a safety event, and monitoring the first electrical signal with a second electronic circuit to regulate an amount of electrical power delivered to the printhead.
摘要:
An ink stick for use in a phase change ink printer includes a first portion of a solid ink stick body, the first portion being formed of a first material of a phase change ink composition. The ink stick also includes a second portion of the solid ink stick body, the second portion being formed of a second material. The first material and the second material combine when the ink stick body is melted.
摘要:
An ink stick support for use in an ink loader of a phase change ink imaging device includes an ink stick carrier for receiving and supporting an ink stick. The ink stick carrier includes a loading platform for receiving the ink stick thereon and a substantially vertically oriented back wall extending from a back edge of the base plate. A coupler for removably attaching the ink stick carrier to a drive mechanism of an ink loader.
摘要:
An imaging system for a printer utilizing a friction belt drum drive is comprised of a drum position sensor, drum pulley, drive belt, motor pulley, drive motor, drive motor position sensor, and controller. The velocities of the drum and motor drive pulleys are measured using the controller and position sensors. These velocities along with the drive ratio are used to determine and monitor slip between the belt and pulleys. The magnitude of the slip measured can be used to trigger the controller to respond to the slip event. These responses may include, for example, disabling the motor or reducing motor current or providing a warning indicative of an excessive slip event. Slip measurement combined with other measurements such as motor current can be used to determine the torque capacity of the friction drive. Further, long-term changes in the ratio of pulley velocities can be used to determine drive belt wear.
摘要:
An ink jet printer includes an ink feed apparatus. The ink feed apparatus includes an ink feed channel for conducting discrete substantially solid ink sticks along a feed channel path, a plurality of ink sticks in the ink feed channel, each of the ink sticks comprising an ink stick body having an ink stick sensing feature on an external surface of the ink stick body that is located between a first end and a second end of the ink stick body, and each of the ink stick bodies has substantially the same mass as the other ink stick bodies in the plurality, a detector positioned at a fixed position proximate the ink feed channel and configured to be triggered by an ink stick sensing feature on an ink stick in the ink feed channel as the ink stick moves along the ink feed path past the detector, and a counter configured to accumulate the number of times the detector is triggered.