Patent ID: 6374076
Filing Date: 2002-04-16
Classification: G03G

Abstract:
An imaging forming apparatus comprising:an image forming section for forming images using developer; a feeding mechanism for feeding an image forming medium to the image forming section, said feeding mechanism including an aligning roller rotated at the speeds defined by the following formulas: N(new1)=N(current)Ã—(Ta/Tb), N(new2)=N(current)Ã—(TaÃ—(1+&agr;/2))/Tb, and N(new3)=N(current)Ã—(TaÃ—(1+&agr;))/Tb, â€ƒwhere N is the number of revolutions, Ta is a first image passing time, Tb is a second image passing time, and &agr; is the specific positive ratio at which an image forming medium is allowed to bend when it passes from the first sensing unit to the feeding mechanism; a transport mechanism for transporting said image forming medium fed by the feeding mechanism; a transfer unit for transferring the developer image by said image forming section onto said image forming medium; a fixing unit for fixing the transferred developer image; a first sensing unit for recognizing or sensing the transport speed Va of said image forming medium fed from said feeding mechanism to said image forming section; a second sensing unit for recognizing or sensing the transport speed Vb of the image forming medium at said image forming section; and a control unit for comparing the transport speed Va of the image forming medium obtained from the first sensing unit and the transport speed Vb obtained from the second sensing unit and for controlling a proper relative speed with respect to the transport speed Va and the transport speed Vb, wherein the feeding speed of the image formed medium is controlled such that it satisfies the relationships (i) Va=Vb, (ii) Va=VbÃ—(1+&agr;/2), and (iii) Va=VbÃ—(1+&agr;) in that order.