Image forming system, image forming apparatus, and recording medium

An image forming apparatus that forms an image on a sheet, comprising:

• a transfer device that transfers a toner image onto a sheet;
• a fixing device that fixes the toner image transferred by the transfer device to the sheet;
• a detector that detects a temperature inside the image forming apparatus;
• and
• a controller that:
• acquires a temperature of the sheet before a sheet heating device heats the sheet,
• causes the sheet heating device to heat the sheet based on the acquired temperature and a sheet passing condition of the sheet, and
• corrects at least one of a transfer current and a transfer voltage in the transfer device based on a detection result by the detector in a case where the sheet heating device heats the sheet.

A non-transitory recording medium storing instructions for a computer of an image forming system, wherein:

• the image forming system comprises:
• an image forming apparatus that comprises:
• a transfer device that transfers a toner image onto a sheet;
• and
• a fixing device that fixes the toner image transferred by the transfer device to the sheet;
• a sheet heating device that heats the sheet on an upstream of the fixing device in a sheet conveyance direction;
• a first detector that detects a temperature inside the image forming apparatus;
• and
• a second detector that detects a temperature of the sheet before the sheet heating device heats the sheet, and
• the instructions cause a computer of the image forming system to function as:
• a controller that:
• causes the sheet heating device to heat the sheet based on a detection result by the second detector and a sheet passing condition of the sheet, and
• corrects at least one of a transfer current and a transfer voltage in the transfer device based on a detection result by the first detector in a case where the sheet heating device heats the sheet.