Patent ID: 9617098
Date: 2017-04-11
CPC Classifications: B65H

Claim:
1. An image forming apparatus comprising: an image forming section which forms an image on a sheet; a registration roller pair which is provided on an upstream side of the image forming section with respect to a sheet transport direction, the registration roller pair correcting skew of the sheet and adjusting timing of transport of the sheet in a manner coordinated with timing of image formation; an upstream-side roller pair which is provided on an upstream side of the registration roller pair with respect to the sheet transport direction; a driving force source which generates a rotating driving force for rotating the registration roller pair and the upstream-side roller pair; a shared clutch which engages and disengages transmission of the rotating driving force from the driving force source to the registration roller pair and the upstream-side roller pair; an upstream-side roller stop delay mechanism which, when the transmission of the rotating driving force is disengaged by the shared clutch, delays stopping of the upstream-side roller pair relative to stopping of the registration roller pair; and a rotary shaft which is provided between the shared clutch and the upstream-side roller pair in a driving force transmission pathway including the shared clutch and the upstream-side roller pair, wherein the upstream-side roller stop delay mechanism includes the driving force transmission member has a first engagement projection which engages with the driving force transmission gear, the driving force transmission gear has, in a side face thereof, a first engagement groove with an arc shape in which the first engagement projection is inserted and which has such a length as to allow the first engagement projection to rotate through a predetermined angle, and the first engagement groove has such a length as to allow the first engagement projection to rotate through a predetermined angle relative to the first engagement groove.