Patent application number | Description | Published |
20080296835 | MOVING CARRIAGE LATERAL REGISTRATION SYSTEM - A method of registering sheets laterally and in skew enables active sheet deskew without translating the sheet in the cross-process direction. A sensor carriage position is controlled to find the sheet edge after which deskew control can start. The average value of the carriage position can then be fed in a feedforward manner to move the image location to match the average paper position. This achieves good average lateral registration and active skew control at a reduced cost. | 12-04-2008 |
20090018791 | CALIBRATION OF THE FUNDAMENTAL AND HARMONIC ONCE-AROUND VELOCITY VARIATIONS OF ENCODED WHEELS - A method of calibrating once-around and harmonic errors of encoded nips is provided. An encoder with an index pulse is used to measure the velocity and rotation of the driven wheel or idler. The geometry of the drive train and wheel and idler is chosen so that their once around and harmonic frequencies are unique such that no other drive errors will generate these frequencies. The method includes running the idler or wheel at substantially constant velocity for N revolutions. Each index triggers the collection of velocity data, which is averaged for N revolutions. This process detects drive train motion errors that are periodic with respect to the timing of the index pulse (i.e., once per revolution of the wheel or idler). Once the velocity errors have been measured, corrections are made. This method may be incorporated in xerographic machines as part of a setup or calibration procedure. | 01-15-2009 |
20090020941 | Sheet registration system with auxiliary nips - A sheet handling system comprising a sheet registration system having sheet registration nips and a receiving system for a sheet including a capturing point for engaging said sheet. Auxiliary nips are positioned between the sheet registration nips and the receiving station. The auxiliary nips are moveable between an open and closed position. A controller receives a signal indicative of the length of said sheet and sends a signal to the auxiliary nips to be in a sheet engaging position when the length of the sheet is less than the distance between the sheet feeding nips and the capturing point of said receiving station and be in an open position if the length of said sheet is greater than the distance between the sheet registration nips and the capturing point of said receiving station. In another embodiment, the auxiliary nips are maintained in their open position until the trailing edge of a sheet is about to leave the sheet registration nips, at which point the auxiliary nips are closed. | 01-22-2009 |
20090121419 | SKEW ADJUSTMENT OF PRINT SHEETS - Systems and methods for reducing sheet skew in a document processing device are disclosed. A document processing device may include a plurality of nips, a sheet skew measurement system, a feedback controller and an actuator. Each nip may include an idler wheel and a drive wheel. The sheet skew measurement system may be configured to measure sheet skew for a sheet. The feedback controller may be configured to generate a control signal in response to the sheet skew measured by the sheet skew measurement system. The actuator may be configured to adjust a loading force applied to a sheet by an idler wheel for at least one nip in response to the control signal. | 05-14-2009 |
20090302145 | PRINTING WEB SYSTEM - A web system, such as a printing web system, having reduced power consumption is disclosed. Power consumption is reduced by joining the unwind and rewind shafts of the web system together through a continuously variable transmission (CVT). The CVT allows the unwind and rewind rolls to provide torque to each other as well, allowing fewer drive motors and/or drive motors of smaller size to be used in the web system. | 12-10-2009 |
20110062659 | ENCODER IDLER ROLL - An encoder idler roll includes an integral idler roll/encoder structure that forms an enclosed housing with a portion of the surface of the idler roll becoming the inner race for the encoder, as well as, the media encoding surface. Additionally, this integral idler/encoder configuration minimizes run out, improves tolerances between parts and stabilizes clearances between the idler roll and its support shaft. | 03-17-2011 |
20110133396 | EDGE SENSOR CALIBRATION FOR PRINTMAKING DEVICES - According to aspects illustrated herein, there is provided a printmaking device, a method, and a system for calibrating sensors. The printmaking device includes a calibration system with a media path, a registration device, and at least one edge sensor. The registration device having a pair of nips connected by a lateral carriage and a calibration member disposed traversely and affixed to the lateral carriage. The lateral carriage is configured to move laterally relative to the media path. The at least one edge sensor may be configured to determine an extent of movement of a first portion of the calibration member. The registration device calibrates the at least one edge sensor by: moving the lateral carriage a predetermined distance; determining the extent of movement of the first portion of the calibration member; and comparing the predetermined distance and the extent of movement so as to determine the calibration factor. | 06-09-2011 |
20110156345 | CLOSED LOOP LATERAL AND SKEW CONTROL - According to aspects illustrated herein, a method, a system, and a printmaking device for performing closed loop lateral and skew control of a sheet is provided. The printmaking device includes a feed path, printing module, and sheet registration system. First, the feed path moves the sheet in a process direction past the lateral sensor. Next, the sheet is registered by measuring a lateral position of one side edge of the sheet at a fixed reference using the lateral sensor and determining a lateral position error of the sheet using the lateral position measurement. After that, a sheet angular velocity is calculated based on the lateral position error using the registration controller. Then, the lateral position error is corrected using the at least one pair of registration nips to adjust the sheet by applying the sheet angular velocity to the sheet. | 06-30-2011 |
20110187046 | NIP RELEASE SYSTEM - Methods and system for reducing sheet skew in a sheet transport system are disclosed. A sheet transport system may include an idler wheel, a drive wheel a drive motor and an actuator. The idler wheel may have a substantially rigid outer layer. The drive wheel may have a compliant outer layer and may correspond to the idler wheel. The drive motor may be operably connected to the drive wheel and may be configured to cause the drive wheel to rotate around a shaft. The actuator may be operably connected to the drive wheel and configured to cause the drive wheel to move between a closed position and an open position. The drive wheel is configured to contact a sheet in the closed position and to not contact a sheet in the open position. | 08-04-2011 |
20110215522 | SHEET REGISTRATION FOR A PRINTMAKING DEVICE USING TRAIL EDGE SENSORS - According to aspects illustrated herein, a printmaking device, a method, and a system for reducing process direction errors of a sheet in a registration device is provided herein. The printmaking device includes a feed path, a printing module, and a sheet registration system. The sheet registration system is along the feed path and includes at least one trail edge sensor, a registration controller, and at least one pair of registration nips. The feed path moves a first side of the sheet in a process direction. The registration controller registers the first side of the sheet by: measuring and correcting a first skew error of the sheet; measuring and correcting a first arrival time of the trail edge of the sheet to determine a first process direction position of the sheet; and delivering the first side of the adjusted sheet at a first predefined delivery time. | 09-08-2011 |
20110234724 | CORRUGATED PRE-CURLER FOR MEDIA HOLD-DOWN TRANSPORT - A system for maintaining depth of focus in an ink jet printer between a series of print heads and corrugated media includes a vacuum transport in combination with a heating element positioned upstream of the series of print heads in order to help the vacuum transport acquire the corrugated media and seal edges of the corrugated media against a platen. | 09-29-2011 |
20110279613 | Protective Device For Inkjet Printheads - An inkjet printhead is configured to reduce the likelihood of media coming into contact with a printhead face. The inkjet printhead includes a housing, an aperture plate having a plurality of apertures in an aperture area through which inkjet ejectors eject ink, and a pair of members aligned with a direction of media movement and extending along a length of the aperture area, the pair of members being configured to lift media away from the plurality of apertures in the aperture area. | 11-17-2011 |
20130033535 | System and Method for Dynamic Stretch Reflex Printing - A method of adjusting the operation of printheads in a printing system with a moving sheet carrying device has been developed. The method includes identifying a first amount of sheet carrying device displacement and second amount of sheet carrying device displacement as the sheet carrying device carries a media sheet past first and second printheads, respectively, for imaging of a predetermined location of the media sheet. A time for operating the second printhead is adjusted based on a difference between the first sheet carrying device offset and the second sheet carrying device offset to provide color registration between ink drops of the first printhead and second printhead on the media sheet. | 02-07-2013 |