Abstract: A device for moving a sheets transversely to its conveying direction with a toothed belt for driving a spindle, whose conveyor rollers for grasping the sheet are attached with a blocking device with at least two toothed gears on the drive belt, whereby the toothed gears have blocking members that strike each other based on a certain gear transformation ratio of the two toothed gears following a certain number of rotations of the toothed gears and which block the movement of the toothed gears.

Abstract: A microwave device 2 is provided for fusing toner onto a print substrate in a printing machine, with a device for generating a synchronized operation to increase the absorption of the microwave irradiation by the print substrate. The microwave energy is provided by the microwave device to the print substrate in the form of pulses and the absorption of the microwave radiation by the print substrate is increased.

Abstract: A control device for removing register errors on printing machines. The control device for controlling the printing drums for a printing machine has at least a first sensor to detect sheets on a conveyor belt and printing drums to apply printing images, whereby a spacing, which is defined between a position on the conveyor belt determined by a signal of the first sensor and the nip of a printing cylinder on the conveyor belt, corresponding to a whole-numbered multiple of the circumference of a nip roller.

Abstract: Printers wherein a snub pulley gripping the conveyor belt from below changes contact force, a first register error occurs; and due to change of the spacing between the image lines on the sheet change, a second register error occurs. To prevent the first register error, time-lags of the first start signals (START OF FRAME) for the application of image lines are changed; and to prevent a second register error, time-lags of the second start signals (START OF LINE) for the application of image frames are changed.

Abstract: A method and device for register mark setting of a printing press for multicolor printing. A calibration run is used for the calibration of register frames, and the correction data produced by the calibration of the frame is used to calibrate the register mark keeping of individual lines or areas of lines from the printing modules of the printing press, whereby the data of the register marks are detected to determine the correction data and are set in relationship to positions of an illustration drum and/or a separation drum.

Abstract: An on-line gloss/density meter for an electrostatographic reproduction apparatus in which pigmented marking particle images are fixed to receiver members respectively by application of heat and/or pressure as such receiver members travel along a transport path through a fuser assembly. The on-line gloss/density meter includes at least one light emitter and at least one light collector, respectively mounted in operative association with the transport path so that light from the emitter, reflected from a receiver member, and is detected and a signal corresponding to such reflected light is produced. A guide element is associated with the transport path and directs a receiver member into a predetermined specified location relative to the beam of light. A logic and control unit, responsive to signals from the light collector, precisely controls operating parameters for the electrostatographic reproduction apparatus.

Abstract: Internally-heated external rollers transfer heat rapidly to a fuser roller in an electrostatographic printer. Stored media process set points, input image content, and input media type data are used to regulate the heat transfer rate by varying the nip width between the heated external rollers and the fuser roller. The rate of heat transfer and the rate of heat transfer adjustment are sufficiently rapid that many different media weights and types may be mixed in a print run without restrictions on media run lengths, without collation requirements per run, and without productivity losses due to slowing of feed rate for heavier receivers.

Abstract: A conditioning device to change the moisture content of printing stock, in which the stock is brought into contact with at least one endless cloth that absorbs moisture. The endless cloth is heated by heated transport rolls. A reduction of the moisture content contributes to a reduction of distortions of the printing image in two-sided printing, especially in digital printing machines.

Abstract: An air quality management apparatus for use in a modular electrostatographic color printer. For air quality management a non-air-conditioned open-loop portion is provided for managing quality of air in a first interior volume, and an air-conditioned recirculation portion is provided for managing quality of air in a second interior volume. The first interior volume includes a fusing station for fusing color images on receiver members. The second interior volume includes a number of tandemly arranged image-forming modules, as well as an auxiliary chamber associated with, yet isolated from, each module, such that air-conditioned air flowing through each module does not mix with air-conditioned air supplied to the modules and to devices within the modules. The second interior volume is differentiated from the first interior volume by at least one separating member. The air-conditioning device is for controlling temperature and relative humidity of air included in the second interior volume.

Abstract: Apparatus and method of making an ink-jet-ink-derived material image on a receiver. An ink jet device is used to form a coagulable ink image on an intermediate member. Coagulates within the coagulable ink image are formed, and excess liquid is removed from the coagulates so as to form an ink-jet-ink-derived material image. The ink-jet-ink-derived image from the operational surface of the intermediate member is transferred to another member, which another member may be a receiver member, a drum or a web.

Abstract: Apparatus and method of making an ink-jet-ink-derived material image on a receiver. An ink jet device is used to form a colloidal ink image on a member. The ink for use in the ink jet device includes an aqueous-based colloidal dispersion of particles and a nonaqueous colloidal dispersion of particles. The ink for use in the ink jet device includes an aqueous-based colloidal dispersion of particles, a nonaqueous colloidal dispersion of particles. The particles of the colloidal ink image are caused to become concentrated adjacent an operational surface of the member. Excess liquid is removed from the particles so as to form an inkjet-ink-derived material image. The ink-jet-ink-derived image is then transferred from the operational surface of the intermediate member to another member, which another member may be a receiver member, a drum or a web.

Abstract: A pre-heater for a fusing assembly for an electrostatographic reproduction apparatus, in which an image-wise pattern of pigmented marking particles is fixed to a receiver member transported along a travel path in operative relation with said fusing assembly. The pre-heater as described includes a housing defining an internal chamber. The housing internal chamber defines an opening adjacent to the receiver member travel path. A heating element is located within the housing internal chamber. An airflow system is provided including a blower, and a distribution plenum in flow communication between the blower and the heating element. An impingement member is positioned in the chamber opening adjacent to said travel path. An impingement plenum is in flow communication between the heating element and the impingement member, and a return conduit is in flow communication between the opening and the blower.

Abstract: A printing machine having at least one printing unit whose image cylinder is driven by friction by an element to which the image is transferred. The influence of a change in the application of print is kept as small as possible, by the width of image cylinder and element being at least so much wider than the maximum width of the image to be transferred that the rotational speed of the image cylinder remains essentially constant in the event of a change in the image.

Abstract: A method and apparatus for conditioning a moving transport web for neutralizing or modifying polar charge density and net charge density on the moving transport web included, for example, in an electrostatographic printer. The web conditioning includes a charging station which has a first stage including two open-wire AC corona chargers facing one another across the transport web, and downstream, a second stage including two gridded AC corona chargers facing one another across the transport web. The grids of the gridded AC corona chargers are preferably grounded, the AC waveforms for energizing the corona wires of the open-wire chargers and the gridded chargers are preferably quasi trapezoidal with no applied DC offsets, with preferably preselected asymmetries in the spacings from the web in the first and second stages. The first stage accomplishes at least about 80% of said neutralizing of said polar charge density.

Abstract: A method for fixation of toner on a carrier or printing stock wherein the printing stock with toner is exposed to at least one radiation pulse or radiation flash of electromagnetic radiation and heated for melting of the toner, and a toner having a sharp transition from its solid to liquid state when heated is used. The toner is preferably characterized by the ratio of the value of the elastic modulus G', at the reference temperature value calculated from the initial temperature at the beginning of the glass transition of the toner plus 50° C., to the value of the elastic modulus G' at the initial temperature itself, is less than 10−5.

Abstract: With a fuser apparatus, for example having a pair of rollers in nip relation to transport a receiver member therebetween, to permanently fix a marking particle image to such receiver member, a skive mechanism for stripping a receiver member adhering to a fuser apparatus roller from the roller, and a mechanism for applying a release oil to the fuser rollers. The skive mechanism includes a plurality of skive fingers formed as elongated, thin, flexible members located so as to engage the fuser apparatus rollers in a manner so as to substantially prevent damage to such associated fuser apparatus rollers. Each of the skive fingers have capillary micro-grooves formed therein for the purpose of channeling release oil away from the respective skive finger tips, thereby substantially eliminating image degradation by build up of the release oil.

Abstract: In a reproduction apparatus having a rotatable imaging roller upon which an image is formed, and a rotatable transfer roller for transferring an image from the imaging roller to a receiver member, a device for mounting the transfer roller to substantially compensate for changes in engagement between the imaging roller and the transfer roller during image transfer. The mounting device includes a bearing assembly for supporting the transfer roller for rotation. A flexible member is associated with the bearing assembly. The flexible member provides movement of the bearing assembly by urging the bearing assembly in a direction to maintain, at least over a limited distance, the transfer roller in constant force engagement with the imaging roller so as to substantially prevent any change in the angular speed relationship therebetween.

Abstract: The invention relates to a device for detecting the location of an edge (2) of a transparent, anisotropic material (3,3′) comprising at least one sensor (1) with a light source (4), two polarization filters (6,7) with transmission axes (8,9) meeting at a 90° angle as well as a light detector (10), whereby the light source (4) and one polarization filter (6) are located on one side of the edge (2) to be detected and the second polarization filter (7) and the light detector are located on the other side. This type of device is to be configured in such a way that it can be used for detecting material (3,3′) with optical axes (14) in various directions without requiring assembly. This is achieved by at least one of the sensors (1) being configured and/or adjustable so that various angles (32) between the transmission axis of the first polarization filter (6) and the optical axis (14) of the transparent, anisotropic material (3,3′) are possible.

Abstract: An electrostatographic machine having a transfer station including a toner image carrier and a transfer member for electrostatic transfer of toner from the toner image carrier to a toner-image area on a receiver sheet in a nip formed between the toner image carrier and the transfer member. Receiver sheet has a leading edge included in a leading edge margin area and a trailing edge included in a trailing edge margin area. A programmable power supply supplies and controls transfer station current. Before the leading edge enters the nip and after the trailing edge leaves the nip, but not while the toner-image area is in the nip, transfer station current is successively switchably altered by the programmable power supply between at least two predetermined magnitudes. The transfer station current is preferably zero, of a low magnitude, in at least a portion of the leading edge margin area so as to effectively suppress wrap.

Abstract: A device for producing and controlling an alternating current with a direct current source in at least one inductive load, in particular for driving a stepper motor, preferably in microsteps. A device for producing and controlling an alternative current with a direct current source in at least one inductive load, in particular for driving a stepper motor, preferably in micro-steps. Such device includes a control loop circuit having an actuator for the control loop containing a complex programmable logic device (CPLD), which is for connecting the control boy to feedback elements. This provides for a flexible adjustment of the current producing and controlling device to the load to be operated, and to the function of the load, without changing the control loop circuit in which the CPLD is implemented. The actuator can be parameterized by use of a (universal) logic description by parameter constants.