Abstract: A drop ejection system includes a working fluid source containing a working fluid, an ink source containing an ink that is immiscible with the working fluid, and at least one drop ejector array module. Each drop ejector array module includes a substrate and an array of drop ejectors disposed on the substrate. Each drop ejector includes a nozzle; an ink inlet connected to the ink source; a working fluid inlet connected to the working fluid source; a pressure chamber in fluidic communication with the nozzle, the ink inlet, and the working fluid inlet; and a heating element configured to selectively vaporize a portion of the working fluid to pressurize the pressure chamber for ejecting ink drops through the nozzle.

Abstract: An inkjet printing system includes a drop ejector array module having a temperature sensor and a logic circuit for sequentially selecting one or more drop ejectors in the array. The system also includes an image data source for providing an image data signal, a memory for storing a temperature correction factor, and a memory for storing at least one drop ejector correction factor. The system includes a fire pulse generator configured to receive signals corresponding to the temperature sensor, the temperature correction factor and the at least one drop ejector correction factor and to output a fire pulse waveform. Also included is a heating pulse generator configured to receive signals corresponding to the temperature sensor and the temperature correction factor and to output a heating pulse waveform. A waveform selector is provided for selecting either a fire pulse waveform or a heating pulse waveform based on the image data signal.

Abstract: An inkjet printing system includes at least one drop ejector array module having an array of drop ejectors disposed on a substrate. A primary temperature sensor is located near a first set of drop ejectors. At least one secondary temperature sensor is located near a second set of drop ejectors. Temperature comparison circuitry on the substrate is configured to compare signals from the primary temperature sensor and the at least one secondary temperature sensor. Pulse modification circuitry on the substrate is electrically connected to the temperature comparison circuitry and is configured to modify an input pulse waveform. The inkjet printing system also includes a controller that is electrically connected to the primary temperature sensor via a temperature output pad and to the pulse modification circuitry via a pulse waveform input pad.

Abstract: An inkjet printhead includes a two-dimensional array of drop ejectors arranged as a plurality of columns, each column including a plurality of banks, and each bank including a plurality of groups that each include a plurality of drop ejectors. The drop ejectors in each group are substantially aligned along a first direction. The groups in each bank are spaced from each other along the first direction and are offset from each other along a second direction. The banks in each column are spaced from each other along the first direction and are offset from each other along the second direction. The columns are offset from each other along the second direction. The two-dimensional array has a width W along the first direction and a length L greater than W along the second direction.

Abstract: A method of printing an image with a printhead having spatially offset groups of drop ejectors, each group having a plurality of drop ejectors that are aligned substantially along a scan direction, includes enabling simultaneous firing of drop ejectors that are corresponding members of a first set of groups. Drop ejectors within each group of the first set are sequentially fired until each member of each group has had opportunity to fire. Corresponding drop ejectors of a second set of groups are simultaneously fired, and drop ejectors within each group of the second set are sequentially fired. Any additional groups of drop ejectors are likewise fired until all drop ejectors have had opportunity to fire during a first stroke. Drop ejectors are fired in subsequent strokes similar to the first stroke as the recording medium is moved relative to the printhead along the scan direction until printing is completed.

Abstract: A method of printing an image with a printhead having spatially offset groups of drop ejectors, each group having a plurality of drop ejectors that are aligned substantially along a scan direction, includes enabling simultaneous firing of drop ejectors that are corresponding members of a first set of groups. Drop ejectors within each group of the first set are sequentially fired until each member of each group has had opportunity to fire. Corresponding drop ejectors of a second set of groups are simultaneously fired, and drop ejectors within each group of the second set are sequentially fired. Any additional groups of drop ejectors are likewise fired until all drop ejectors have had opportunity to fire during a first stroke. Drop ejectors are fired in subsequent strokes similar to the first stroke as the recording medium is moved relative to the printhead along the scan direction until printing is completed.

Abstract: A lower housing assembly for a valve actuator comprises a lower housing and an inventive latch subassembly. The lower housing includes valve stem and mounting post apertures that receive therethrough the valve stem and mounting post of a valve assembled with the lower housing assembly. The inventive latch subassembly comprises a rigid latch lever and a latch bias member. The rigid latch lever pivots between engaged and disengaged positions; the latch bias member biases the latch lever toward the engaged position. In the engaged position, the latch lever obstructs the mounting post aperture to prevent assembly of the lower housing with the valve, or engages a slot in the mounting post to prevent disassembly of the lower valve housing from the valve. In the disengaged position, the mounting post aperture is unobstructed by the latch lever, thereby permitting assembly and disassembly of the lower housing and the valve.

Abstract: A system and method using a skylight panel within a skylight frame attached to a flexible actuator. In an embodiment, the system provides for automated opening and closing of a remotely located skylight or window. The system may also include a solar panel coupled to a rechargeable battery pack that provides power to an electric motor that controls the actuation of the actuator. Such control may be realized through a gear train with a sprocket wheel that drives a flexible chain-like actuator that is coupled to the skylight panel. The system may further include a control circuit for controlling the above-described operation wherein the control circuit is also operable to communicate with a remote control device having two-way communication between them.

Abstract: A paintball hopper, comprising, a container defining a bottom paintball guide and a paintball moving assembly, adapted to move paintballs in a path determined by the bottom paintball guide. In addition a chute leading from the paintball guide is so disposed that paintballs may enter the chute from the guide without undergoing a substantial change in direction.