An image forming apparatus includes a controller configured to, each time an unpaired first pattern element formed on a recording medium is conveyed over a particular distance in a conveyance direction in response to a conveyor rotating by a first amount, control an image former to form a second pattern element to be paired with the unpaired first pattern element thereby forming a first test pattern, and each time an unpaired third pattern element formed on the recording medium is conveyed over a specific distance in the conveyance direction in response to the conveyor rotating by a second amount, control the image former to form a fourth pattern element to be paired with the unpaired third pattern element thereby forming a second test pattern. At least one of the first and second amounts is a non-integer multiple of a rotation amount of the conveyor that makes a single rotation.

A printer, comprising: a printing part; a conveying mechanism to send out a print medium from a medium roll around which the print medium is wound, the conveying mechanism comprising a correcting mechanism to correct curl of the print medium in a winding direction by curving the print medium in a reverse direction of the winding direction; and a controller configured to: store a finish time of the printing; obtain a start time when next printing is started; determine whether an elapsed time elapsed from the finish time to the start time is longer than a particular time; when the elapsed time is longer than the particular time, cause the conveying mechanism to convey the print medium by a particular length which is longer than a length between the correcting mechanism and the printing part; and cause the printing part to perform the printing.

A printer includes a recording head, a belt, a scale unit, a reading head, a gripping unit. The belt includes a first surface configured to support a medium and a second surface opposite to the first surface. The gripping unit includes a first abutting portion that comes into contact with the first surface, and a second abutting portion that comes into contact with the second surface. The gripping unit can be changed between a gripping state of moving along with the glue belt while gripping the glue belt, and a release state of being separated from the glue belt. When the gripping unit is in the release state, the second abutting portion is separated from the second surface in conjunction with the first abutting portion being separated from the first surface.

A printing apparatus includes a printing section that performs printing on a medium containing calcium carbonate, a transport section that rotationally drives a transport belt that forms at least a portion of a transport path in which the medium is transported, a voltage supply section that supplies a charging voltage to a charging roller for charging the transport belt, a detection section that detects whether or not charging abnormality has occurred in the transport belt, a determination section that determines whether a cause of the charging abnormality is abnormality of the voltage supply section or abnormality of the transport belt, and a machine learning section that performs machine learning of a determination condition in the determination section, based on a learning model in which a rotation amount of the transport belt and a detection result of the detection section are associated with each other.

A printing apparatus includes a printing section that performs printing on a medium containing calcium carbonate, a transport section that rotationally drives a transport belt that forms at least a portion of a transport path in which the medium is transported, a voltage supply section that supplies a charging voltage to a charging roller for charging the transport belt, a detection section that detects whether or not charging abnormality has occurred in the transport belt, a determination section that determines whether a cause of the charging abnormality is abnormality of the voltage supply section or abnormality of the transport belt, and a machine learning section that performs machine learning of a determination condition in the determination section, based on a learning model in which a rotation amount of the transport belt and a detection result of the detection section are associated with each other.

A printed matter creating device includes a controller configured to: acquire print data; form a first print on a printing medium while conveying the printing medium, the first print being based on first ON dots in the acquired print data; interrupt the conveyance of the printing medium after forming the first print; cut the printing medium after interrupting the conveyance; and form a second print on the printing medium while conveying the printing medium after cutting the printing medium, the second print being based on second ON dots in the acquired print data. The print data includes a specific print data corresponding to a connecting part connecting the first print and the second print. Based on the acquired print data, the controller adjusts at least one of: aspects of the first ON dots in the specific print data; and aspects of the second ON dots in the specific print data.

A printing apparatus includes a transport unit, a printing head, and a control unit that prints, on a printing medium, a test pattern for inspecting a state of ink discharge by a nozzles. The test pattern includes a first pattern element group in which a plurality of pattern elements to be printed by the nozzles are arranged in the transport direction, and a second pattern element group in which a plurality of pattern elements to be printed by the nozzles are arranged in the transport direction. After the control unit causes the transport unit to transport, by a distance equal to or greater than a nozzle pitch, the printing medium printed with the first pattern element group by causing the nozzles to discharge the ink, the control unit prints the second pattern element group on the printing medium by causing the nozzles used to print the first pattern element group to discharge the ink.

Disclosed is a thermal print apparatus including a medium detection sensor arranged from a thermal head at a distance shorter than an outer circumferential length of the platen roller, and a controller. The controller determines that the print medium is wrapped around the platen roller if the print medium is not detected by the medium detection sensor even when the print medium is fed by a feed amount at which the leading edge of the print medium reaches the medium detection sensor after starting of printing on the print medium. In this case, the print medium is fed backward by reversely rotating the platen roller.

Disclosed is a thermal print apparatus including a medium detection sensor arranged from a thermal head at a distance shorter than an outer circumferential length of the platen roller, and a controller. The controller determines that the print medium is wrapped around the platen roller if the print medium is not detected by the medium detection sensor even when the print medium is fed by a feed amount at which the leading edge of the print medium reaches the medium detection sensor after starting of printing on the print medium. In this case, the print medium is fed backward by reversely rotating the platen roller.

In order to provide an image forming apparatus which can reduce color deviation at the time of forming an image on a medium, the present printing apparatus comprises an image forming unit which forms an image by superimposing images, each formed with corresponding color of ink, on a transfer film while heating a thermal head, a film conveying device which conveys a transfer film, a sensor which detects a stretch of the transfer film occurring due to heating with the thermal head, a controller which controls the image forming unit to change a line cycle of the thermal head in accordance with a stretch of the transfer film detected by the sensor.