Image forming apparatus

An image forming apparatus comprising:

• a feeding portion configured to feed a sheet;
• an image forming portion configured to form an image to be transferred at a predetermined interval on the sheet sequentially fed by the feeding portion;
• a transferring portion configured to transfer the image formed by the image forming portion on the sheet;
• a conveying portion configured to stop a sheet fed by the feeding portion at a predetermined position and to convey the sheet to the transferring portion so that the image formed by the image forming portion is transferred to the sheet;
• and
• a type discriminating portion configured to discriminate whether a type of the sheet to be fed belongs to a first sheet type group including at least a plain paper or to a second sheet type group including at least a coated paper,
• wherein in a case that an image forming interval of the image forming portion is the predetermined interval and the type discriminating portion discriminates the sheet to be fed is the first sheet type, a time period to stop the sheet by the conveying portion is a first period,
• wherein in a case that the image forming interval of the image forming portion exceeds the predetermined interval and the type discriminating portion discriminates the sheet to be fed is the first sheet type, a time period to stop the sheet by the conveying portion is a second period which is longer than the first period, and
• wherein in a case that the image forming interval of the image forming portion exceeds the predetermined interval and the type discriminating portion discriminates the sheet to be fed is the second sheet type, a time period to stop the sheet by the conveying portion is a time period which is shorter than the second period.

An image forming apparatus comprising:

• a feeding portion configured to feed a sheet;
• an image forming portion configured to form an image to be transferred at a predetermined interval on the sheet sequentially fed by the feeding portion;
• a transferring portion configured to transfer the image formed by the image forming portion on the sheet;
• a conveying portion configured to stop the sheet fed by the feeding portion at a predetermined position and to convey the sheet to the transferring portion so that the image formed by the image forming portion is transferred to the sheet;
• a type discriminating portion configured to discriminate a type of the sheet to be fed;
• and
• a controlling portion configured to execute a first mode or a second mode based on the type of the sheet discriminated by the type discriminating portion,
• wherein in the first mode, a timing at which the feeding portion starts to feed the sheet toward the conveying portion is a timing earlier than a timing at which the image forming portion starts forming the image to be transferred on the sheet, and
• wherein a difference of the second mode between a timing at which the feeding portion starts to feed the sheet and a timing at which the image forming portion starts forming the image to be transferred on the sheet is shorter than a difference of the first mode between the timing at which the feeding portion starts to feed the sheet and the timing at which the image forming portion starts forming the image to be transferred on the sheet,
• wherein a stopping period of the sheet by the conveying portion in the second mode is shorter than the stopping period of the sheet by the conveying portion in the first mode.