Drying device, control device, and drying method

A control device for controlling a drying device including a roller, a first heating source and a second heating source being included inside the roller, wherein the drying device is for drying a recording medium conveyed by rotation of the roller, the control device comprising:

• a temperature obtaining unit configured to obtain a temperature of a first region and a temperature of a second region, wherein the temperature obtaining unit is configured to obtain the temperature of the first region from a first temperature detector configured to detect the temperature of the first region on a surface of the roller, wherein the first region is in a vicinity of the first heating source, and the first region is heated by the first heating source, and wherein the temperature obtaining unit is configured to obtain the temperature of the second region from a second temperature detector configured to detect the temperature of the second region on the surface of the roller, wherein the second region is in a vicinity of the second heating source, and the second region is heated by the second heating source;
• and
• a heating controller,
• wherein, in a direction of an axis of the roller, a shortest distance between the first temperature detector and the first heating source is less than a shortest distance between the first temperature detector and the second heating source,
• wherein, in the direction of the axis of the roller, a shortest distance between the second temperature detector and the second heating source is less than a shortest distance between the second temperature detector and the first heating source,
• wherein, upon detecting that a temperature of the first region is higher than or equal to a predetermined temperature while heating by the first heating source is terminated, the heating controller is configured to terminate heating by the second heating source, and
• wherein, upon detecting that a temperature of the second region is higher than or equal to the predetermined temperature while heating by the second heating source is terminated, the heating controller is configured to terminate heating by the first heating source.

A drying method executed in a drying device, wherein the drying device includes a roller, a first heating source and a second heating source being included inside the roller, wherein the drying device is for drying a recording medium conveyed by rotation of the roller, the drying method comprising:

• obtaining, by the drying device, a temperature of a first region and a temperature of a second region, wherein the temperature of the first region is obtained from a first temperature detector for detecting the temperature of the first region on a surface of the roller, wherein the first region is in a vicinity of the first heating source, and the first region is heated by the first heating source, and wherein the temperature of the second region is obtained from a second temperature detector for detecting the temperature of the second region on the surface of the roller, wherein the second region is in a vicinity of the second heating source, and the second region is heated by the second heating source, wherein, in a direction of an axis of the roller, a shortest distance between the first temperature detector and the first heating source is less than a shortest distance between the first temperature detector and the second heating source, and wherein, in the direction of the axis of the roller, a shortest distance between the second temperature detector and the second heating source is less than a shortest distance between the second temperature detector and the first heating source;
• upon detecting that a temperature of the first region is higher than or equal to a predetermined temperature while heating by the first heating source is terminated, terminating, by the drying device, heating by the second heating source, and
• upon detecting that a temperature of the second region is higher than or equal to the predetermined temperature while heating by the second heating source is terminated, terminating, by the drying device, heating by the first heating source.