To correct the transfer attitude of a sheet member into a correct position by providing a stopper brought into contact with the sheet member and moving with constant speed difference from conveyor belts, on a sheet member conveying path of the conveyor belts for transferring the sheet member to a following process.
A sheet member 18 is bent in a first chopper folding device 1a and then brought into contact with a paper stopper 11 of a front uniforming stopper device via a pair of fold-in rollers 20a, 20b arranged below. The paper stopper 11 controlled in its rotating speed slightly preceding the sheet member 18, so that the preceding side P1 of the sheet member 18 is speed-reduced by the paper stopper 11, and then the side P2 delayed by skew feed is pushed out by the travel of upper and lower conveyor belts 3, 4 so as to correct the skew feed of the sheet member 18. The accurate attitude is then maintained by the holding rotation of the upper and lower conveyor belts 3, 4 to transfer the sheet member 18 to a following second chopper folding device.
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