| CPC B65H 85/00 (2013.01) [B65H 5/062 (2013.01); B65H 2513/10 (2013.01); B65H 2701/1311 (2013.01); B65H 2801/03 (2013.01)] | 12 Claims |
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1. An image forming apparatus comprising:
a main conveyance path having an image forming region;
a sub conveyance path connecting a branch point on a downstream side of the image forming region and a merging point on an upstream side of the image forming region in the main conveyance path;
a feeding unit configured to feed a sheet to the main conveyance path;
an image forming unit configured to form an image on the sheet conveyed on the main conveyance path in the image forming region of the main conveyance path;
a first roller configured to send the sheet to the image forming region;
a second roller configured to be rotationally driven in a first direction until a rear end of the sheet in a conveying direction passes beyond the branch point, and rotationally driven in a second direction different from the first direction after the rear end has passed the branch point, to send the sheet to the sub conveyance path;
a third roller configured to convey the sheet toward the merging point in the sub conveyance path;
a first drive source configured to drive the first roller and the third roller;
a second drive source configured to drive the second roller; and
a control unit configured to control the first drive source, the second drive source, and the feeding unit;
wherein
the control unit is configured to perform a first control of changing a conveying speed of the sheet by the first roller from a reference speed in order to adjust timing at which the sheet reaches the image forming region until a front end of the sheet in the conveying direction reaches a first position between the first roller and the image forming region, and control the first drive source so that the conveying speed of the sheet becomes the reference speed after the front end has reached the first position; and
the control unit is configured to control a feeding timing to the main conveyance path of a second sheet to be fed to the main conveyance path by the feeding unit after a first sheet so that the first control is not executed while the first sheet is being conveyed in the sub conveyance path by both the second roller and the third roller.
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