Printing apparatus (20) includes a continuous blanket (24) and a set of motorized rollers (31), which advance the blanket at constant speed through an image area. Print bars (38) eject droplets of ink at respective locations onto the blanket in the image area. Monitoring rollers (42), in proximity to the locations of the print bars, contact the blanket to be rotated by blanket advancement. Each monitoring roller includes an encoder (44), which outputs a signal indicative of a rotation angle of the monitoring roller. A control unit (40) collects, during a calibration phase, the signal from the encoders over multiple rotations of the monitoring rollers, detects a deviation of the signal from the encoder relative to a clock signal having a predefined frequency, and computes runout correction factors. During an operational phase, the control unit applies the runout correction factors to synchronize the droplets ejection from the print bars.

In one example, a heated pressure roller can include a structural element positioned within a belt roller, a platen coupled to the structural element, wherein the platen comprises: a first side to guide a belt of the belt roller to form a first angle on the first side, and a second side to guide the belt of the belt roller to form a second angle on the second side that is different than the first angle.

A tray for a printing apparatus including a conveying unit that conveys the tray holding a printing medium, and a printing unit that performs printing onto a print surface of the printing medium on the tray includes: a placement surface for placing thereon an adapter that holds the printing medium; a pressing member disposed on the upstream side of the adapter in the inserting direction of the tray with respect to the printing apparatus to press the adapter placed on the placement surface toward a downstream side of the inserting direction; a regulating portion configured to regulate a movement of the adapter by abutting the adapter pressed by the pressing member; and an opening into which a protrusion of the adapter is insertable.

A tray is used in a printing apparatus that includes a conveying unit configured to convey the tray holding a printing medium, and a printing unit configured to perform printing onto a print surface of the printing medium held by the tray. The tray includes a placement surface on which a printing medium is to be placed, a pressing member that presses the printing medium placed on the placement surface towards a downstream side of an inserting direction of the tray with respect to the printing apparatus, and a regulating portion configured to regulate a movement of the printing medium by abutting the printing medium pressed by the pressing member.

A mark mitigating device for a printing device has a protector sheet to cover ribs of a printer platen of the printer device to prevent the ribs from causing marks on print media. The mark mitigating device further has a fixing system to fixate the mark mitigating device relative to the printer platen. The protector sheet has an opening to pass through vacuum applied by the printer platen to attract print media.

A mark mitigating device for a printing device has a protector sheet to cover ribs of a printer platen of the printer device to prevent the ribs from causing marks on print media. The mark mitigating device further has a fixing system to fixate the mark mitigating device relative to the printer platen. The protector sheet has an opening to pass through vacuum applied by the printer platen to attract print media.

Printing apparatus (20) includes a continuous blanket (24) and a set of motorized rollers (31), which advance the blanket at a constant speed through an image area. One or more print bars (38) eject droplets of ink at respective locations onto the blanket in the image area. One or more monitoring rollers (42), in proximity to the locations of the print bars, contact the blanket so as to be rotated by advancement of the blanket. Each monitoring roller includes an encoder (44), which outputs a signal indicative of a rotation angle of the monitoring roller. A control unit (40) collects, during a calibration phase, the signal from the encoders over multiple rotations of the monitoring rollers and computes runout correction factors. During an operational phase, the control unit synchronizes ejection of the droplets from the print bars using the computed runout correction factors.

Printing apparatus (20) includes a continuous blanket (24) and a set of motorized rollers (31), which advance the blanket at a constant speed through an image area. One or more print bars (38) eject droplets of ink at respective locations onto the blanket in the image area. One or more monitoring rollers (42), in proximity to the locations of the print bars, contact the blanket so as to be rotated by advancement of the blanket. Each monitoring roller includes an encoder (44), which outputs a signal indicative of a rotation angle of the monitoring roller. A control unit (40) collects, during a calibration phase, the signal from the encoders over multiple rotations of the monitoring rollers and computes runout correction factors. During an operational phase, the control unit synchronizes ejection of the droplets from the print bars using the computed runout correction factors.

There is provided an inkjet printing apparatus capable of stably outputting high quality images in a configuration of feeding a print medium that is kept horizontal, performing printing by the use of a print head, and conveying the print medium vertically upward. To this purpose, a platen that supports the back side of the print medium in a position facing a printing part of the print head is located to support the print medium at an angle greater than 0 and less than 90 with respect to the horizontal direction, thereby reducing a contact pressure from roller pairs on the printed side immediately after printing.

There is provided an inkjet printing apparatus capable of stably outputting high quality images in a configuration of feeding a print medium that is kept horizontal, performing printing by the use of a print head, and conveying the print medium vertically upward. To this purpose, a platen that supports the back side of the print medium in a position facing a printing part of the print head is located to support the print medium at an angle greater than 0 and less than 90 with respect to the horizontal direction, thereby reducing a contact pressure from roller pairs on the printed side immediately after printing.