摘要:
Embodiments according to the present disclosure provide methods and systems of determining nip velocity profiles in a medium registration system (20), 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 (VA,VB); 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 (β) 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 (10) 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 (NA,NB) 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:
An apparatus and method are provided for the use of an optical sensor to determine the position of a printing device relative to a piece of paper or a paper-handling surface. The optical sensor reads marks to detect movement and/or direction of movement or spacing of imprints on the paper. Benefits include swath stitching calibration, color to color registration, producing printing device alignment data and generating information for printing device firing signals. The present invention is applicable to a wide field of printing technologies, including, but not limited to, acoustic ink printing, thermal ink jet printing, piezo ink jet printing, ionographic printing and a variety of other printing technologies involving the need for positioning a printing device relative to a piece of paper.
摘要:
In an image forming device, the inherent eccentricities of the photosensitive belts or drums and the timing belt speed reduction drive trains cause misregistration of the developed latent images. To prevent such misregistration, the timing belt (48) of the speed reduction drive train (42) has a peripheral length which is selected from a range of values dependent on a preselected speed reduction ratio n between the driven pulley (46) and the driving pulley (44). Further, each one of the range of values is an integral improper fraction or integral multiple of the circumference of the driven pulley. Moreover, the driving pulley (50) of the last pulley belt set coupled to the photosensitive member (40) and a driven pulley (46) prior to the last pulley belt set rotate n full rotations as the photosensitive member rotates from the image forming location to the image transfer location. In conjunction, every speed reduction ratio of all pulley belt sets prior to the last pulley belt set is an integer value. Thus, the eccentricities will be self-compensated.
摘要:
A method and apparatus for measuring colorimetric, gloss and registration data on a substrate exiting a printing machine is described. A detector using a series of red, green, and blue filters (130,132,134) collects image data and maps the collected data to absolute color coordinates. The apparatus is factory calibrated to the specific colorants used in the printing machine. Gloss measurements are made using the same apparatus. Registration data between the various color separations is also obtained using detectors (140,142,144,146) and feedback delivered to the various imaging modules. The apparatus allows on the fly data to be obtained and machine specific corrections to be made.
摘要:
An encoder interface for interfacing an encoder having a first part (104) defining a first axis to a structure having a second part (106) defining a second axis substantially parallel to the first axis includes a portion for translating the first part (104) with respect to the second part (106) in a direction transverse to the first axis and a portion for rigidly rotationally stabilizing the first part (104) with respect to the second part (106) against a rotation of the first part (104) about the first axis induced by a translation of the first part (104) with respect to the second part (106) in the direction transverse to the first axis. A method for interfacing an encoder having a first part (104) defining a first axis with a structure having a second part (106) defining a second axis substantially parallel to the first axis includes the steps of translating the first part (104) with respect to the second part (106) in a direction transverse to the first axis and rigidly rotationally stabilizing the first part (104) with respect to the second part (106) against a rotation of the first part (104) about the first axis induced by a translation of the first part (104) with respect to the second part (106) in the direction transverse to the first axis.
摘要:
An apparatus (48) which advances a sheet (25) through a transfer zone (64) and into registration with information developed on a moving member (20). The sheet (25) is advanced to a position wherein a leading portion thereof is within the transfer zone (64) and a trailing portion thereof is immediately behind the transfer zone (64) relative to the forward direction of movement of the moving member (20). The leading portion of the sheet (25) is advanced through the transfer zone (64) at a first velocity and the trailing portion of the sheet (25) is advanced in a region immediately behind the transfer zone (64) at a second velocity, which is greater than the first velocity, so as to create a buckle (19) in the trailing portion of the sheet (25) in the region. The buckle (19) functions to eliminate relative velocity between the photoconductive belt (20) and any portion of sheet (25) within the transfer zone (64) so as to substantially eliminate slip between the sheet (25) and the photoconductive belt (20).
摘要:
An apparatus (48) which advances a sheet (25) hrough a transfer zone (64) and into registration with information developed on a moving member (20). The sheet (25) is advanced to a position wherein a leading portion thereof is immediately ahead of the transfer zone (64) relative to the forward direction of movement of the moving member (20) and a trailing portion thereof is within the transfer zone (64). The trailing portion of the sheet (25) is advanced through the transfer zone (64) at a first velocity and the leading edge of the sheet (25) is advanced in a region immediately ahead of the transfer zone (64) at a second velocity, which is less than the first velocity, so as to create a buckle (27) in the leading portion of the sheet (25) positioned immediately ahead of the transfer zone (64) relative to the forward direction of movement of the moving member (20). The buckle (27) functions to eliminate relative velocity between the photoconductive belt (26) and any portion of sheet (25) within the transfer zone (64) so as to substantially eliminate slip between the sheet (25) and the photoconductive belt (20).