Patent ID: 8020985
Filing Date: 2011-09-20
Classification: B41J

Abstract:
1. A method of controlling an image forming device including: a recording head that forms images on a recording medium having a width and a length, the recording head being disposed in a position along a recording medium conveying path; a first pair of conveying rollers that is disposed in a first position along the recording medium conveying path and conveys the recording medium with frictional force created at a nip position, the recording medium being conveyed while being oriented in a direction in which lengthwise of the recording medium is in parallel with a recording medium conveying direction; and a second pair of conveying rollers that is disposed in a second position along the recording medium conveying path and conveys the recording medium with frictional force created at a nip position, the first position being upstream of the position in which the recording head is disposed and also of the second position with respect to the recording medium conveying direction, a distance between the first position and the second position being set shorter than the length of the recording medium, the method comprising (a) controlling the first and second pairs of conveying rollers to halt a conveying operation of the recording medium when a trailing edge of the recording medium has moved to or exceeded a position downstream from the nip position of the first pair of conveying rollers by a first prescribed distance during a first prescribed period of time running from a time instant when the trailing edge of the recording medium has passed through the nip position of the first pair of the conveying rollers, wherein the step (a) comprises: (b) conveying the recording medium on a step-by-step basis to selectively execute a first step conveyance and a second step conveyance, wherein the conveying step (b) changes a conveying distance such that the first step conveyance is executed by the first pair of conveying rollers to convey the recording medium a first conveying distance and the second step conveyance is executed by the first pair of conveying rollers to convey the recording medium a second conveying distance, the second conveying distance being greater than the first conveying distance; and (c) controlling the first and second pairs of conveying rollers to convey the recording medium the second conveying distance when the trailing edge of the recording medium passes through the nip position of the first pair of conveying rollers.