Sheet conveying device and image forming system

An image forming system, comprising:

• an image forming device for forming an image;
• a post-processing device of which sheet conveying speed is higher than a sheet conveying speed of the image forming device;
• and
• a sheet-conveying device, connected between the image forming device and post-processing device, for feeding in a sheet ejected from the image forming device and ejecting the sheet to the post-processing device, the sheet-conveying device including:
• a feed-in roller for feeding in a sheet ejected from the image forming device;
• a conveying roller for conveying the sheet;
• an ejection roller for ejecting the sheet to the post-processing device;
• a conveying path from the feed-in roller to the ejection roller;
• and
• a controller for controlling sheet conveying speeds of the feed-in roller, conveying roller, and ejection roller,
• wherein the controller performs control such that:
• when the sheet conveying device feeds in the sheet ejected from the image forming device, the conveying speeds of the feed-in roller, conveying roller, and ejection roller are the same as a conveying speed at which the image forming device ejects the sheet;
• and
• when the image forming device has completed ejection of a trailing edge of the sheet, the conveying speeds of the feed-in roller, conveying roller, and ejection roller are the same as a conveying speed at which the post-processing device feeds in the sheet.