| 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 |
