In an example, a space adjuster may comprise a cam shaft, a first fin disposed on a first end of the cam shaft, a second fin disposed on a second end of the cam shaft, opposite from the first end, and a cam lug disposed on the cam shaft in between the first end and the second end. The first fin may have a first profile to transfer a first longitudinal force into a first rotation of the cam shaft, and the second fin may have a second profile to transfer a second longitudinal force into a second rotation of the cam shaft, opposite to the first rotation. A cam surface of the cam lug may be spaced increasingly farther away from a longitudinal axis of the cam shaft throughout the first rotation of the cam shaft.

A printing unit includes a support frame that is supported to face a transfer passage for a sheet; an inkjet head that is fixed to the support frame and performs printing on a printing surface of the sheet; drive bodies that are rotatably supported on the support frame on both sides of the inkjet head in a width direction of the sheet and come into contact with the printing surface of the sheet; and a drive device that drives and rotates the drive bodies.

A printer includes a gap adjustment unit that displaces a carriage in a Z-axis direction in which a gap changes. The gap adjustment unit has a sliding member that moves in a width direction integrally with the carriage, and a cam member that is interposed between the carriage and the sliding member and has a stepped portion in which a maintenance surface that maintains a position of the carriage in the Z-axis direction and an adjustment surface that changes the position of the carriage in the Z-axis direction are alternately arranged in the width direction. The gap adjustment unit is configured such that the cam member slides in the width direction with respect to the carriage and the sliding member to change the gap. The gap adjustment unit includes a buffer unit that decreases a displacement speed of the carriage in the Z-axis direction when the gap is reduced.

A liquid discharge apparatus includes a recording head, a height changing mechanism, an image sensor, and control circuitry. The head discharges liquid onto a recording medium from above the medium to form an image on the medium. The height changing mechanism changes a height position of the head. The image sensor captures the image on the medium. The control circuitry is configured to: cause the height changing mechanism to change the height position of the head; cause the head to discharge the liquid at different height positions to form adjustment patterns on the medium; cause the image sensor to image the adjustment patterns; select at least one adjustment pattern from the adjustment patterns based on information on an abnormal image obtained from imaging data of the adjustment patterns; and determine, as the height position of the head, a height position corresponding to the at least one adjustment pattern selected.

A liquid discharging device includes a support unit configured to support a medium, a discharging unit configured to discharge liquid to the medium, a reading unit configured to read an image formed on the medium with the liquid, a holding unit configured to hold the discharging unit and the reading unit while moving in a scanning direction, and a control unit configured to control operation of the discharging unit, the reading unit, and the holding unit. The control unit is configured to perform pattern forming operation that causes the discharging unit to discharge the liquid to form a test pattern image on the medium, reading operation that causes the reading unit to read at least a partial region of the test pattern image, and flushing operation that causes the discharging unit to perform flushing for discharging the liquid to the region in the test pattern image which was read.

An ink impact point correction apparatus for automatically measuring and correcting an impact point of ink using a pattern on a substrate, on which a coordinate system is displayed, and a substrate treating system including the same are provided. The ink impact point correction apparatus includes a recognition unit for acquiring information on the impact point of ink at a plurality of points located on a substrate; and a correction unit for correcting a position of an ink discharge point on the substrate based on the information on the impact point, wherein a coordinate pattern in the form of a coordinate system is formed at the plurality of points.

A liquid discharge apparatus includes a recording head, a height changing mechanism, an image sensor, and control circuitry. The head discharges liquid onto a recording medium from above the medium to form an image on the medium. The height changing mechanism changes a height position of the head. The image sensor captures the image on the medium. The control circuitry is configured to: cause the height changing mechanism to change the height position of the head; cause the head to discharge the liquid at different height positions to form adjustment patterns on the medium; cause the image sensor to image the adjustment patterns; select at least one adjustment pattern from the adjustment patterns based on information on an abnormal image obtained from imaging data of the adjustment patterns; and determine, as the height position of the head, a height position corresponding to the at least one adjustment pattern selected.

A liquid ejecting device includes a supporting unit supporting a medium, an ejecting unit ejecting liquid onto the medium, a scanning driving unit moving the ejecting unit, and a control unit controlling the ejecting unit and the scanning driving unit. The control unit is configured to be capable of performing, a first processing for forming a test pattern, and acquiring an ejection velocity parameter associated with an ejection velocity of the liquid detected from the test pattern, a second processing for calculating the ejection velocity of the liquid from the ejection velocity parameter, calculating a first correction component that depends on the calculated ejection velocity, and setting a correction value including the first correction component, and a third processing for correcting ejection timing of the liquid using the correction value, when the liquid is ejected from the ejecting unit onto the medium as the ejecting unit is moved.

A partial printing fluid short detection system can detect a partial printing fluid short in a print head. The partial printing fluid short detection system includes a timing circuit to detect a print gap of the print head, and the partial printing fluid short detection system can detect the partial printing fluid short in response to detection of the print gap.

A liquid discharge device includes a liquid discharge head to discharge a liquid, a head holder to hold the liquid discharge head, a sub-carriage to hold the head holder, a carriage to hold the sub-carriage and move in a main scanning direction, an adjuster supported by the sub-carriage, and a guide to guide the sub-carriage to be movable in a vertical direction. The carriage includes a reference shaft extending in the main scanning direction, the reference shaft supports the sub-carriage via the adjuster and positions the sub-carriage in the vertical direction, the adjuster adjusts an inclination of the sub-carriage with respect to the reference shaft, the sub-carriage includes a sub-reference shaft extending in parallel with the reference shaft, and the guide allows the sub-reference shaft to move in the vertical direction while restricting a movement of the sub-reference shaft in a sub-scanning direction perpendicular to the main scanning direction.