Abstract:
Es handelt sich um ein Verfahren zum ortsgenauen Nachgravieren von Druckzylindern, wobei spezielle Marken in den Zylinder eingraviert und ausgewertet werden.
Abstract:
An image recording apparatus records an image on a printing plate wound around a rotating drum with a light beam emitted from an exposure head. In the image recording apparatus, an actual drum rotational speed Nx is recognized, and the image is recorded on the printing plate in an accelerating period (AS) in which the actual drum rotational speed Nx is equal to or higher than a predetermined rotational speed (N2), a constant-rotational-speed period (CS), and a decelerating period (SS). An exposure beam position, an exposure beam output, and an auxiliary scanning speed of the exposure head are corrected dependent on the peripheral speed of the drum in the accelerating period (AS) and the decelerating period (SS).
Abstract:
The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup (S2000) to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error (S3000), determining margin shifts (S4000) to compensate for the residual magnification error, and applying the margin shifts (S5000). Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.
Abstract:
An image forming apparatus which forms toner images of different colors by at least one image forming means with a rotatably driven image bearing means, and forms a picture by transferring the different colored toner images formed by the image forming means onto an image transfer medium supported on a rotatably driven endless bearing means, or directly onto the endless bearing means, the image forming apparatus wherein a latent image writing position on the image bearing means being angularly spaced by approximately 180° from an image transfer position comprising: pattern detecting means for detecting a color misregistration detecting pattern formed on the endless bearing means; and drive control means for individually controlling rotation speeds of rotary means, such as the image bearing means and the endless bearing means, so as to suppress a periodical rotation variation by using detecting information of a vibration component on the periodical rotation variation, which is obtained from detecting signals derived from the pattern detecting means.
Abstract:
The flat bed raster drawing machine is controlled automatically, includes a flat table to bear a flexible material, such as paper, fixed guides on which a carriage moves perpendicular to the lengthwise axis of the flexible material between the aforementioned guides, and a second carriage bearing the pin printer array type head that moves over the preceding one, in the direction of the lengthwise axis of the paper. The paper is moved in a controlled manner on the table parallel to its lengthwise axis.
Abstract:
A beam steering apparatus (502) for use in a laser pattern generation apparatus, having a steering mirror (602) for deflecting the radiant energy beam to a first point in space, a second steering mirror (604) for deflecting the radiant energy beam to a second point in space, and a position detection means (605-608) comprising a first beam splitting means (605) for creating an alignment beam from said radiant energy beam, a second beam splitting means (606) for creating a first positional beam and a second positional beam from said alignment beam, a first sensor (608) to detect the position of said radiant energy beam at said first point in space from said first positional beam, and a second sensor (607) to detect the position of said radiant energy beam at a second point in space from said second positional beam.
Abstract:
An oscillation detector circuit detects an oscillating condition of a resonant light deflector having a reflecting mirror, and applies an oscillating condition signal to a reference signal generator, which generates a reference signal. An auxiliary scanning feed motor for feeding a scanned medium in an auxiliary scanning direction is controlled by the reference signal to adjust the speed at which the scanned medium is fed in the auxiliary scanning direction, depending on the oscillating condition of the resonant light deflector.
Abstract:
In an electronic image printing apparatus of the type in which a light sensitive image recording layer (53) is exposed by a light beam (60,60',60''), an apparatus (57,92,154) is provided for determining and controlling the position of the light beam (60,60',60'') which comprises one or two alternating pluralities of diffraction grating patterns (4,6,8;18,20,22) disposed in a corresponding relationship with at least a portion of the light sensitive image recording layer (53) to produce a diffraction grid (52) which when irradiated by the light beam (60,60',60'') provides a diffracted beam which is representative of the position of the light beam on the diffraction grid (52). The position of the diffracted beam is detected to provide the requisite signal for controlling the position of the light beam (60,60',60'').
Abstract:
An image forming device, such as an LED printer, liquid crystal printer, laser printer or the like, comprises a sheet feeding unit (2), a sheet carrier (22), a pulse motor (12) provided for the sheet carrier (22) and driven to carry a sheet (10) fed from the sheet feeding unit (20) to a printer (16) for printing an image over at least one entire line of a sheet (10), and which is perpendicular to the direction in which the sheet is carried, by one printing operation thereof, a motor controller (14) for controlling the stepping motion of the pulse motor (12) for moving the sheet (10), a printing controller (18) for controlling the printing operation of the printer (16) in such a way that each printing operation thereof is synchronized with the stepping motion of the pulse motor (12), and an outlet tray (24) for receiving the printed sheet (10). Such a device can be of smaller size, and can be cheaper to produce, than previously-proposed devices.