Abstract:
Embodiments use an apparatus comprising a media path that is adapted to transport media sheets within the printing apparatus. Fuser rolls are positioned along the media path, and the fuser rolls are adapted to fuse marking material on the media sheets as the media sheets pass the fuser rolls. A heating belt is positioned to pass a first location between the fuser rolls and to pass a second location separate from the fuser rolls. A heater is positioned in the second location, and the heater is adapted to heat the heating belt. In addition, an iso-thermalizing roller is in contact with the heating belt. In some embodiments, the elements can be positioned in any order. In other embodiments, the elements are positioned such that the heating belt passes the elements in the following order: the heater, the fuser rolls, and then the iso-thermalizing roller.
Abstract:
A fast acting fusing method and apparatus are provided for (a.) first moving a certain quantity of working liquid within a fusing heat pipe device from a heat transferring region of the fusing heat pipe device to an induction heating region of the fusing heat pipe device for maximizing liquid-to-device wall contact area within the induction heating region; (b.) using inductor heating coils to apply heat to the induction heating region of the fusing heat pipe device for heating the working liquid within the induction heating region; (c.) allowing heated vapors from the working liquid being heated within the induction heating region to move into the heat transferring region of the fusing heat pipe device for heating the heat transferring region; (d.) using a controller to compare heating of the heat transferring region of the fusing heat pipe device to a given heating value; and (e.) next moving the certain quantity of working liquid back from the induction heating region to the heat transferring region when heating of the heat transferring region of the fusing heat pipe device reaches the given heating value.
Abstract:
A printing apparatus includes a toner image producing station for forming a toner image. The apparatus includes an image bearing member for supporting the toner image; and a transfuse station for simultaneously transferring and fusing the toner image to a substrate transfuse station. The substrate transfuse station has: (i) a transfuse member; (ii) a heating roll adapter to heat the transfuse member; (iii) a cooling roll adapted to cool the transfuse member; and (iv) at least one phase change roll adapted to both heat and cool the transfuse member, each of the rolls in contiguous contact with the transfuse member and adapted to move the transfuse member. Included are embodiments for a method of passively managing the temperature distribution on a transfuse member and the transfuse system itself.
Abstract:
Methods and apparatus are provided for forming images on a moving, charge retentive surface using a stream of radiant energy, modulated in imagewise fashion, wherein the intensity of the stream of radiant energy is controlled based on measured variations of the actual speed of the imaging surface from a set speed. In particular, a motion encoder, which is preferably the same motion encoder previously used to control the proper location of each line of information on the imaging surface is used to monitor the actual, instantaneous speed of the imaging surface to produce an actual speed signal. This actual speed signal is compared to a set speed signal to produce a speed variance signal which represents the difference between the actual imaging surface speed and the set speed. The variance speed signal is then used to control the intensity of the stream of radiant energy.
Abstract:
In an imaging process, a toned image layer on an image receptor is simultaneously transferred and fused to a recording medium. A radiation curable material is incorporated in the toned image layer such that when the toned image layer is irradiated, the radiation curable material is cured. The resulting cured material has greater adhesion to the toner material and the recording medium than to the surface of the image receptor. The apparatus for performing the above process is also disclosed.
Abstract:
A thermo-optic light modulation array is disclosed for use in an imaging system of an electrophotographic printer to produce electrostatic latent images. The array comprises a light transmitting medium arranged in contact with an array of pixel shaped heaters which are selectively energized in response to digitized data signals for pulse heating the portions of the medium in vicinity of the heaters. Temperature gradients in the medium produced by the energized heaters cause changes in the index of refraction of the medium, so that selected portions of a sheet of collimated light directed through the temperature gradients in the light transmitting medium are deflected or modulated. The modulated light may be blocked by a stop and the unmodulated light may be directed to the precharged photoconductive member of the printer to form the latent images or visa versa. Several modes of light modulation are disclosed. In one mode, the light is directed through the medium just above and closely adjacent the heaters in a grazing fashion. A second transmissive mode directs the light through both the medium and transparent heaters, while a third reflective mode directs the light through the medium into reflective surfaces on the heaters. The reflective mode of modulation may be either for the production of linear, one-dimensional lines of picture elements or for the production of full two-dimensional alpha-numeric information. The other modes produce latent images one line of picture elements or pixels at a time.
Abstract:
An ink jet printhead for use in a thermal ink jet printer having bubble-generating heating elements formed symmetrically around the entrances to passageways in the ink-holding printhead chamber that terminate as nozzles. The heating elements are individually addressable with current pulses to form vapor bubbles, which, during collapse, produce an impact force that expels and propels droplets toward a recording medium. An alternate embodiment includes an ultrasonic generator in the printhead chamber to produce pressure waves in the ink contained in the chamber. The current pulse applied to the heating element is synchronized with the lower pressure wave to obtain bubble growth with substantially lower temperatures resulting in a more energy efficient printhead.
Abstract:
A propulsion system for a vehicle comprising a hydrostatic transmission wherein the system typically includes an electric motor, a hydrostatic pump preferably of the continuous variable displacement type, hydrostatic motors for cooperation with the wheel axles of the vehicle, and a gas accumulator which provides for the compression and expansion of a gaseous medium depending on whether the transmission fluid is being pumped into or withdrawn from the gas accumulator. The gas accumulator comprises a pressure vessel which serves as a structural member of the vehicle. It may have a tubular configuration disposed as a load-bearing structural member of the chassis or it may comprise a number of interconnected pressure-retaining panels, that form the vertical sides and/or roof sections of the vehicle. Suitable mechanical and electrical/electronic controls are provided to monitor the gas pressure in the gas accumulator and to regulate the stroke and function of the hydrostatic pumps and motors.
Abstract:
Methods and systems of ejecting ink drops from an inkjet printer are disclosed. The methods and systems can include a printhead with one or more stepped nozzles each with an associated entrance diameter and exit diameter. Ink can be received into the printhead and formed into ink drops in the stepped nozzles. The ink drops can each have an associated drop mass and drop speed. The stepped nozzles can be provided such that the exit diameter can independently dictate the drop mass and the entrance diameter can independently dictate the drop speed. As such, the complexity of jet design optimization is reduced.
Abstract:
Apparatuses useful for printing and methods of fixing marking materials onto media are disclosed. An exemplary embodiment of the apparatuses useful in printing includes a first member including a first surface; a second member comprising at least one ferromagnetic material having a relative magnetic permeability greater than 1, a susceptor over the at least one ferromagnetic material, the susceptor comprising at least one electrically resistive metal, and a second surface over the at least one ferromagnetic material and the susceptor, the second surface forming a nip with the first surface at which media are received; and a magnetic field generator for generating a magnetic field to inductively heat the second member.