Patent ID: 8038139

Claim:
An inserter for feeding an insert-sheet forming a sheet bundle with a printed sheet which is discharged from an image forming apparatus at any one of a plurality of speeds, the inserter comprising: a storing unit that stores the insert-sheet; a sheet-feeding unit that feeds the insert-sheet stored in the storing unit; a conveyance unit that discharges the printed sheet discharged from the image forming apparatus connected upstream of the inserter and the insert-sheet fed from the sheet-feeding unit to a downstream device connected to downstream of the inserter; and a controller that determines conveying speeds of the insert-sheet and the printed sheet to be discharged to the downstream side device by the conveyance unit, wherein the controller determines: the conveying speed of the printed sheet discharged to the downstream side device by the conveyance unit, based on a conveying speed of the printed sheet discharged from the image forming apparatus; and the conveying speed of the insert-sheet discharged to the downstream side device by the conveyance unit, based on the conveying speed of the printed sheet discharged to the downstream side device first after or last before the insert-sheet is discharged to the downstream side device.