A liquid ejecting head includes an ejection surface which extends in a first direction (X-direction) and on which a plurality of nozzles ejecting a liquid are distributed; and protrusion sections that are formed on the ejection surface and protrude on a liquid ejection side in which the liquid is ejected. The ejection surface has abutting regions on which a sealing body that seals the plurality of nozzles by surrounding the plurality of nozzles abuts. When projecting the abutting regions and the protrusion sections along a first direction (X-direction) on a virtual line along a second direction (Y-direction) intersecting the first direction, the protrusion sections are disposed on the ejection surface such that projection of the protrusion sections crosses a boundary of projection of the abutting regions.

A liquid ejecting head includes an ejection surface which extends in a first direction (X-direction) and on which a plurality of nozzles ejecting a liquid are distributed; and protrusion sections that are formed on the ejection surface and protrude on a liquid ejection side in which the liquid is ejected. The ejection surface has abutting regions on which a sealing body that seals the plurality of nozzles by surrounding the plurality of nozzles abuts. When projecting the abutting regions and the protrusion sections along a first direction (X-direction) on a virtual line along a second direction (Y-direction) intersecting the first direction, the protrusion sections are disposed on the ejection surface such that projection of the protrusion sections crosses a boundary of projection of the abutting regions.

An information processing device performs processing of specifying a positional relationship between a first printing section and a second printing section based on image capturing data of a test image that is printed on a printing medium by the first printing section and the second printing section in each of which a plurality of printing elements are arranged. The test image includes a plurality of first lines which are printed by the first printing section so as to have printing positions different from each other in a line arrangement direction on the printing medium and a plurality of second lines which are printed by the second printing section so as to have printing positions different from each other in the line arrangement direction. The information processing device contains a printing coordinate acquisition section, a printing position acquisition section, and a positional shift amount calculation section.

Methods for printing using printing systems comprising a flexible intermediate transfer member (ITM) disposed around a plurality of guide rollers at which encoders are installed, and an image-forming station at which ink images are formed by droplet deposition by print bars onto the ITM, can include measuring a local velocity of the ITM under one of the print bars, determining a stretch factor for a portion of the ITM based on a relationship between an estimated stretched length fixed physical distance between print bars, controlling an ink deposition parameter according to the stretch factor so as to compensate for stretching of the reference portion of the ITM.

Methods for printing using printing systems comprising a flexible intermediate transfer member (ITM) disposed around a plurality of guide rollers at which encoders are installed, and an image-forming station at which ink images are formed by droplet deposition by print bars onto the ITM, can include measuring a local velocity of the ITM under one of the print bars, determining a stretch factor for a portion of the ITM based on a relationship between an estimated stretched length fixed physical distance between print bars, controlling an ink deposition parameter according to the stretch factor so as to compensate for stretching of the reference portion of the ITM.

A droplet deposition apparatus (1) comprising: a first head module (101A, 101B, 102A) and a second head module (101B, 102A, 102B) arranged in at least partially overlapping relationship, each head module having a plurality of nozzles in at least one nozzle array (A1, B1); and a storage (200) configured to store a table of determined best aligned nozzle pairs in an overlap region and corresponding skew angles (Θi) of at least one of the head modules relative to a datum of the droplet deposition apparatus and/or a corresponding positional offset of the second head module relative to the first head module; wherein, in the overlap region, nozzles of the first head module are arranged at a first nozzle pitch (P2) and nozzles of the second head module are arranged at a second nozzle itch (P3). Associated methods in respect of determining misalignment information in respect of such a droplet deposition apparatus, and determining one or more best aligned nozzle pairs in an overlap region between at least two head modules, are also provided.

A cover member includes two end regions located at two ends in a first direction, and two beam portions which extend in the first direction and connect the two end regions together and which, together with the two end regions, form a single opening that exposes a plurality of discharge ports. When a width of the opening is denoted as a [mm], a minimum length in the first direction of the end regions is denoted as c [mm], a modulus of longitudinal elasticity of the cover member is denoted as E [GPa], and a thickness of the cover member is denoted as t [mm], the following expression is established.

[00001]$c\ge \frac{10.Math.{\left(\frac{a}{25}\right)}^4}{{\left(\frac{t}{0.3}\right)}^3.Math.\left(\frac{E}{200}\right)}$

A controller includes a plurality of control circuits configured to be connected to respective ones of a plurality of head units. Each head unit has a nozzle. The plurality of control circuits includes a first control circuit, a second control circuit connected to the first control circuit in series to perform communication, and a third control circuit connected to the second control circuit in series to perform communication. The first control circuit is configured to transmit first data to the second control circuit. The first data is data for controlling at least one of the plurality of head units. The second control circuit is configured to transmit second data to the third control circuit. The second data is data for controlling at least one of the plurality of head units. A data amount of the second data is smaller than a data amount of the first data.

A controller includes a plurality of control circuits configured to be connected to respective ones of a plurality of head units. Each head unit has a nozzle. The plurality of control circuits includes a first control circuit, a second control circuit connected to the first control circuit in series to perform communication, and a third control circuit connected to the second control circuit in series to perform communication. The first control circuit is configured to transmit first data to the second control circuit. The first data is data for controlling at least one of the plurality of head units. The second control circuit is configured to transmit second data to the third control circuit. The second data is data for controlling at least one of the plurality of head units. A data amount of the second data is smaller than a data amount of the first data.

A plurality of sub control circuits are connected to respective ones of a plurality of head units. One of the plurality of sub control circuits is connected to a main control circuit so as to perform communication. The plurality of sub control circuits include a first control circuit and a second control circuit. The second control circuit is connected to the first control circuit in series so as to perform communication. The first control circuit is configured to: receive first data, the first data including a first parameter and a second parameter, the first parameter corresponding to the first control circuit, the second parameter corresponding to the second control circuit; and transmit the first data to the second control circuit. The second control circuit is configured to: receive the first data from the first control circuit; and delete the first parameter from the first data.