JP2014044232A5

JP2014044232A5 -

Info

Publication number: JP2014044232A5
Application number: JP2012185028A
Authority: JP
Filing date: 2012-08-24
Publication date: 2015-10-08
Anticipated expiration: 2032-08-24

Description

本発明は、画像形成装置において、搬送されるシートにトナー像を転写する転写手段と、前記転写手段でシートに転写されたトナー像をシートに定着させる定着手段と、前記転写手段と前記定着手段との間におけるシート搬送方向と直交する幅方向の中央部分に配置され、シートを前記転写手段から前記定着手段に向けて吸引搬送する吸引ベルト搬送手段と、前記転写手段と前記吸引ベルト搬送手段との間で、前記転写手段と前記定着手段との間でシートに形成されるループを検知するループ検知手段と、前記ループ検知手段の検知信号に基づき前記転写手段と前記定着手段とのシート搬送速度差を制御してシートのループ量を調整する制御手段とを備えることを特徴とする。 The present invention provides an image forming apparatus, a transfer unit that transfers a toner image to a conveyed sheet, a fixing unit that fixes the toner image transferred to the sheet by the transfer unit, the transfer unit, and the fixing unit. A suction belt conveyance unit that is disposed at a central portion in a width direction orthogonal to the sheet conveyance direction between the transfer unit and the transfer unit, and sucks and conveys the sheet from the transfer unit toward the fixing unit. between the sheet conveying speed of the loop detecting means for detecting a loop formed in the sheet, and the transfer means and the fixing means based on a detection signal of the loop detecting means between said fixing means and said transfer means And a control means for adjusting the loop amount of the sheet by controlling the difference.

Claims

Transfer means for transferring a toner image to a conveyed sheet;
Fixing means for fixing the toner image transferred to the sheet by the transfer means on the sheet;
A suction belt conveying unit disposed at a central portion in the width direction perpendicular to the sheet conveying direction between the transfer unit and the fixing unit, and sucking and conveying the sheet from the transfer unit toward the fixing unit;
Between said transfer means and the suction belt conveyance unit, and loop detection means for detecting a loop formed in the sheet between said transfer means and said fixing means,
Control means for adjusting a sheet loop speed by controlling a difference in sheet conveyance speed between the transfer means and the fixing means based on a detection signal of the loop detection means,
An image forming apparatus.

It said loop detection means, you detect a loop in the vicinity of the central portion of the width direction perpendicular to the sheet conveyance direction in between said transfer means and the suction belt conveyance unit,
The image forming apparatus according to claim 1.

A sheet support unit configured to support a sheet to be conveyed by the suction belt conveyance unit on both sides in the width direction of the suction belt conveyance unit between the transfer unit and the fixing unit;
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.

Between the transfer unit and the suction belt conveyance unit, a conveyance guide extending in the width direction orthogonal to the sheet conveyance direction,
The loop detection means includes
So as to protrude from the conveyance guide, the swing member that swings in response to the loop of the sheet in contact with the sheet to be conveyed,
Having a sensor unit which outputs an ON-OFF signal in accordance with the rocking position of the rocking member,
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.

The sensor unit has a plurality of sensor members whose detection states are switched according to the basis weight of the conveyed sheet.
The image forming apparatus according to claim 4.