摘要:
A device is provided for curling side edges of a sheet of media to be held down by a hold down system in an image production system. The device has a first shaped element having an outer section, the outer section of the first shaped element pointing in a first direction; a second shaped element having an outer section, the outer section of the second shaped element pointing in a second direction opposite the first direction; a first pinching element adjacent to the first shaped element, a first pathway being formed between the first pinching element and the first shaped element; and a second pinching element adjacent to the second shaped element, a second pathway being formed between the second pinching element and the second shaped element. The first pathway is for forming an edge curl on a first side edge of the sheet of media, the second pathway is for forming an edge curl on a second side edge of the sheet of media, the second side edge is parallel to the first side edge, and the first and second side edges are parallel to a process direction in which the sheet of media is fed into the device.
摘要:
A method and system for insuring printing accuracy in simplex imaging or duplex imaging, including a media sheet in a media path adapted to move the media sheet through the system. The media path includes sensors and a datum. The sensors include a leading edge sensor and a trailing edge sensor adapted to record the time of arrival of the edge. The edge arrival time difference is determined between the arrival time of the edge using output from the trailing edge sensor and the arrival time of the edge using output from the leading edge sensor. A correction factor is based upon the time difference. The time of arrival of the media sheet at the datum is determined using the correction factor to align items printed on both side of the media sheet.
摘要:
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.
摘要:
An apparatus and method for transporting substrate media including a nip assembly having a drive wheel operably connected to a drive mechanism for rotating the drive wheel, and an idler member disposed adjacent the drive wheel. The idler wheel and drive wheel forming a nip. The drive wheel and idler wheel are displaceable from each other to form a nip gap therebetween. A nip force generator is operably connected to the nip assembly. The nip force generator develops a first nip force upon entry of the substrate media into the nip and formation of the nip gap and develops a second nip force subsequent to the first nip force. The second nip force is greater than the first nip force.
摘要:
A print device for registering a printable medium during a duplex printing process. The print device includes a controller, at least one leading edge sensor operably connected to the controller, the at least one leading edge sensor configured to detect a leading edge of a printable medium having a first and a second side when the first side is facing away from the at least one leading edge sensor, a coarse registration sensor operably connected to the controller, the coarse registration sensor configured to detect a leading edge of the printable medium when the second side of the printable medium is facing away from the at least one leading edge sensor, and at least one trail edge sensor operably connected to the controller, the at least one trail edge sensor configured to detect a trailing edge of the printable medium.
摘要:
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.
摘要:
A method and apparatus for determining the lateral position of a moving sheet in a sheet registration system. A side edge sensor is moved from a known location until the side edge of the moving sheet is detected. A signal is generated indicative of the position of the side edge when it is detected. The position of the side edge as indicated by the signal is used along with skew of the sheet to determine the lateral position of the sheet.
摘要:
Embodiments according to the present disclosure provide methods and systems of determining nip velocity profiles in a medium registration system, including parameterizing a set of equations into a set of standard parameters, the set of equations representing an analytic form of the nip velocity profiles; determining values of the parameters through an iteration process; and determining the nip velocity profiles based on the determined values of the parameters. The embodiments separately provide systems and methods of simulating a medium registration process, including inputting an error parameter to a velocity nominal profile of a nip in a medium registration system; determining an output value of the velocity nominal profile; and using the output value in a regression algorithm to obtain a simulated relationship, the simulated relationship indicative of a manner in which the error parameter influences the output value. The embodiments separately provide systems and methods of determining an angular velocity of a medium relative to a nip in a medium registration system, including determining a path of the nip on the medium; and determining the angular velocity as a function of a position of the nip in the path. The embodiments separately provide systems and methods of controlling nips of a medium registration system, including wagging a medium relative to a center line of two nips of the medium registration system; and then unwagging the medium relative to the center line of the two nips.
摘要:
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.
摘要:
An electrostatographic and/or xerographic machine includes a media path adapted to move a media sheet. Sensors are positioned adjacent the media path. The media sheet has a leading edge and a trailing edge and the sensors are adapted to identify locations of the leading edge and the trailing edge of the media sheet. A marking device is positioned adjacent the media path. The marking device is adapted to print first items on a first side of the media sheet and print second items on a second side of the media sheet. A registration controller is operatively connected to the media path and to the sensors. The registration controller determines a length between the leading edge and the trailing edge of the media sheet using output from the sensors, and determines the parallelism between the leading edge and the trailing edge of the media sheet using output from the sensors. The registration controller calculates a registration correction factor based upon the length and the parallelism and corrects the alignment of the first items printed on the first side of the media sheet with the second items printed on the second side of the media sheet using the registration correction factor.