a folder apparatus includes at least one lead - in mechanism , having a left lead - in tape and a left exit roller and a corresponding right lead - in tape and a right exit roller , the right and left lead - in tapes forming a signature passage for delivery of signatures . the right exit rollers rotate about a first axis , the left exit rollers rotate about a second axis . spring means are assigned to at least on of the lead - in tapes above the corresponding lead - in tape rollers for biasing the tapes .