Abstract: In a printer having a print head moveable relative to a recording medium, the recording medium and print head may touch each other, thereby possibly damaging the print head and/or the recording medium. In order to prevent further damage, it is advantageous to detect a medium touch as soon as possible. An available feedback signal relating to the print head, e.g. originating from a carriage on which the print head is mounted, is employed to determine whether a medium touch has occurred such that a dedicated medium touch or crash sensor may be omitted. A malfunctioning nozzle signal is used to determine a change in a number of malfunctioning nozzles to detect a medium touch. Alternatively, a print head position signal is used to determine a position error and derive from the position error whether or not a medium touch has occurred.

Abstract: An imaging system for processing a media includes a media transport path, an imaging station, a displacement device that controllably displaces the media along the media transport path relative to the imaging station, and a controller assembly. The controller assembly includes a feedback filter, a feedforward filter, a low-pass filter and a memory that stores and time delayed releases control data. During operation, the displacement device is actuated in response to an actuation command generated by the controller assembly. The actuation command has a feedback component based on a filtering by the feedback filter of an error signal including information about the position error between a desired and an actual position of the media and a feedforward component based on a time delayed, low-pass filtered, frequency dependent filtering of the error signal by the feedforward filter. The feedforward filter is configured such that the closed-loop controlled characteristics of the displacement device are compensated.

Abstract: A printer having a sheet feed system for feeding an image receiving sheet to a print station, and a sheet treatment system for subjecting the paper to an anti-cockle treatment including a humidity sensor arranged to detect the degree of humidity of ambient air, and a control system adapted to control the sheet treatment system in response to the detected degree of humidity.

Abstract: An imaging system for processing a media includes a media transport path, an imaging station, a displacement device that controllably displaces the media along the media transport path relative to the imaging station, and a controller assembly. The controller assembly includes a feedback filter, a feedforward filter, a low-pass filter and a memory that stores and time delayed releases control data. During operation, the displacement device is actuated in response to an actuation command generated by the controller assembly. The actuation command has a feedback component based on a filtering by the feedback filter of an error signal including information about the position error between a desired and an actual position of the media and a feedforward component based on a time delayed, low-pass filtered, frequency dependent filtering of the error signal by the feedforward filter. The feedforward filter is configured such that the closed-loop controlled characteristics of the displacement device are compensated.

Abstract: In a printer having a print head moveable relative to a recording medium, the recording medium and print head may touch each other, thereby possibly damaging the print head and/or the recording medium. In order to prevent further damage, it is advantageous to detect a medium touch as soon as possible. An available feedback signal relating to the print head, e.g. originating from a carriage on which the print head is mounted, is employed to determine whether a medium touch has occurred such that a dedicated medium touch or crash sensor may be omitted. A malfunctioning nozzle signal is used to determine a change in a number of malfunctioning nozzles to detect a medium touch. Alternatively, a print head position signal is used to determine a position error and derive from the position error whether or not a medium touch has occurred.

Abstract: The present invention relates to a printer which includes a print unit, a supply unit for the supply of substrate, said supply unit containing a first holder for rotatably receiving a first web of a first substrate wound into a roll, and a second holder for rotatably receiving a second web of a second substrate wound into a roll, a first motor for driving the first roll and a second motor for driving the second roll, an actuating unit for actuating the motors and a switch for connecting the actuating unit to the first or second motor, and a control unit, by means of which the switch connects the actuating unit to the first motor when the printer is configured for printing a first substrate, and the switch connects the actuating unit to the second motor when the printer is configured for printing the second substrate.