A printing apparatus includes a heat transfer system for transferring heat away from or to a print medium moving in a movement direction through the printing apparatus. The heat transfer system includes a heat transfer member with a rotatable support surface configured for supporting the print medium. The heat transfer member is provided with at least one channel. The support surface is rotatable around an axis in order to move the print medium in the movement direction. A fluid circulation means is configured for supplying a fluid through said at least one channel. The at least one channel is configured such that, in operation, when fluid is supplied through said at least one channel, torque is generated in a fluido-mechanical manner around said axis, contributing to a rotational movement of the support surface of the heat transfer member.

In some examples, a media conditioner includes a conveying component to convey a sheet of printable media, a first heating element to heat a first portion of the conveying component, a second heating element to heat a second portion of the conveying component, and a controller. The controller is to provide a variable first power level to the first heating element and a variable second power level to the second heating element to cause the first and second heating elements to generate heat. In addition, the controller is to determine a first parameter based on the first power level and to determine a second parameter based on the second power level. The controller is also to produce a result indicator based on a result of a comparison between the first parameter and the second parameter.

It is disclosed a conditioning roller for use within a printing system. The conditioning roller comprises: a roller body comprising an inner volume and an outer surface; a conditioning media attached to the outer surface of the roller body; a heating element; and a fluid dispensing mechanism. The heating element and the fluid dispensing mechanism are provided to act on the conditioning media from the inner volume of the roller body as to heat or wet the conditioning media.

According to examples, an apparatus may include a processor that may identify a first period for a heated system, the first period including a first set of power events and a first zero power event for the heated system and may identify a second period for the heated system, the second period including a second set of power events and a second zero power event for the heated system. The processor may also borrow, from the second period, a portion of a second power event of the second set of power events and may apply the borrowed portion of the second power event to a first power event of the first set of power events during the first period to remove the first zero power event from the first period.

According to examples, an apparatus may include a processor and a nontransitory computer readable medium on which is stored machine readable instructions that are to cause the processor to generate a linear piecewise control signal based on an internal resistance of a heating lamp to control a rate of change of a phase angle of an applied voltage in the heating lamp until a peak current in the heating lamp is within a predefined threshold of a maximum current rating of an alternating current (AC) power source of a circuit.

A drying device H is provided with: a first heating roller part 10 and a second heating roller part 20 that guide a printed object X and are capable of heating the printed object X; a first heating part 11 that is formed so as to be opposed to the outer circumferential surface of the first heating roller part 10 and a second heating part 21 that is formed so as to be opposed to the outer circumferential surface of the second heating roller part 20, wherein after the printed object X has been guided to the first heating roller part 10 on the upstream side, it is guided to the second heating roller part 20 on the downstream side, with the setting temperature of the second heating roller part 20 being made higher than the setting temperature of the first heating roller part 10, and an ink-jet printing device I equipped with such a heating device.

A dryer for drying a drying object includes a hot air generator to generate hot air to be blown onto the drying object, a contact heater to contact and heat the drying object, and a controller to control a heating temperature of the contact heater and a temperature of the hot air. The controller controls the heating temperature of the contact heater to be above a first predetermined temperature from a start of generation of the hot air by the hot air generator until the temperature of the hot air reaches a second predetermined temperature.

To provide a drying device which can dry a printed object, and is also capable of sufficiently suppressing curling of the printed object itself or wrinkles and cockling from occurring in the printed object, and an ink-jet printing device equipped with such a drying device.

The present invention relates to a drying device H that is provided with: a first heating roller part 10 and a second heating roller part 20 that guide a printed object X and are capable of heating the printed object X; a first heating part 11 that is formed so as to be opposed to the outer circumferential surface of the first heating roller part 10 and a second heating part 21 that is formed so as to be opposed to the outer circumferential surface of the second heating roller part 20, wherein after the printed object X has been guided to the first heating roller part 10 on the upstream side, it is guided to the second heating roller part 20 on the downstream side, with the setting temperature of the second heating roller part 20 being made higher than the setting temperature of the first heating roller part 10, and an ink-jet printing device 1 equipped with such a heating device.

There is disclosed print agent drying unit 10, 20, 30 to dry print agent 40 on a substrate 14, the drying unit comprising: a substrate support 12 to support a substrate 14; an exciter 18, 28, 38 to excite a boundary layer of print agent 40 applied on the substrate 14, to thereby dissociate the boundary layer from the print agent; and a radiation source 16 to direct radiation energy to the substrate to dry the print agent. Methods of drying print agent 40 on a substrate 14 are also disclosed, including a method comprising: causing the substrate 14 to vibrate to dissociate a boundary layer of print agent 40 on the substrate 14; and heating the print agent 40 to dry the print agent 40.

A drying device includes a roller, and the drying device is for drying a recording medium conveyed by rotation of the roller. The drying device includes a first heating source and second heating source included inside the roller; first and second temperature detectors for respectively detecting a temperature of a first region on a surface of the roller and a temperature of a second region on the surface of the roller; and a heating controller that controls heating and termination of the heating by the first heating source and/or the second heating source, wherein, upon detecting that a temperature of one region of the first region and the second region is higher than or equal to a predetermined temperature, the heating controller terminates heating by one heating source corresponding to the other region.