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A folding machine includes a first folding roll with a series of the gripper assemblies and a series of tucker assemblies uniformly and alternately spaced to interact with a series of gripper and tucker assemblies of an adjacent second folding roll. The series of alternately spaced gripper and tucke

A folding machine includes a first folding roll with a series of the gripper assemblies and a series of tucker assemblies uniformly and alternately spaced to interact with a series of gripper and tucker assemblies of an adjacent second folding roll. The series of alternately spaced gripper and tucker assemblies interact to grip, carry, and release a sheet material in a manner so as to generate an interfolded stack of sheet material. The folding machine further includes a phase adjustment assembly configured adjust the location of the fold in the sheet material, to locate the fold in a proper position on the sheet relative to the leading end of the successive sheet. The phase adjustment assembly generally includes a first helical gear that moves along an axial direction, and an input device configured to cause the axial movement of the first gear so as to cause a change in phasing and a change in location of the fold in the sheet material.

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I claim: 1. An interfolding machine, comprising; an upstream roll mounted for rotation with a first shaft; first and second folding rolls configured to create a fold in each of a pair of successively fed overlapping sheets, wherein one of the folding rolls is mounted for rotation with a second sha

I claim: 1. An interfolding machine, comprising; an upstream roll mounted for rotation with a first shaft; first and second folding rolls configured to create a fold in each of a pair of successively fed overlapping sheets, wherein one of the folding rolls is mounted for rotation with a second shaft, wherein the first and second folding rolls are configured to create an alternating oppositely directed fold in each of the pair of successively fed overlapping sheets; a first helical gear secured to the first shaft; a second helical gear secured to the second shaft; and phase adjustment device configured to cause rotational movement of the first shaft through the first gear and the second shaft through the second gear to adjust the position at which a fold is formed in one of the sheets, wherein the phase adjustment device includes an oppositely oriented helical gear arrangement mounted on an axially movable input shaft, wherein axial movement of the input shaft causes rotational movement of the first and second gears through the helical gear arrangement to change the phasing of the upstream roll relative to the folding rolls during operation of the interfolding machine. 2. The interfolding machine as recited in claim 1, wherein the input device includes: a rotatable adjustment actuator; and an adjustment shaft coupled to the adjustment actuator, wherein rotation of the adjustment actuator causes rotation of the adjustment shaft, and wherein the rotational movement of the adjustment shaft causes axial movement of the input shaft. 3. The interfolding machine as recited in claim 2, wherein the input device further includes: a locking device configured to secure the position of the adjustment shaft thereby the first gear. 4. The interfolding machine as recited in claim 2, wherein the adjustment actuator is interconnected with the input shaft via a threaded connection that causes axial movement of the input shaft upon rotation of the adjustment actuator. 5. A method of adjusting an interfolding machine, the method comprising the steps of: providing an interfolding machine including an upstream roll mounted for rotation with a first shaft, and first and second folding rolls configured to create a fold in a sheet, wherein one of the folding rolls is mounted for rotation with a second shaft, wherein the upstream roll is configured to supply successive overlapping sheets to the folding rolls and wherein the folding rolls are configured to create an alternating oppositely directed fold in each of a pair of successively fed overlapping sheets, wherein a first helical gear is secured to the first shaft and a second helical gear is secured to the second shaft; and adjusting the phasing between the upstream roll and one of the folding rolls to alter the location of a fold in a sheet relative to an edge of an overlapping sheet by causing relative rotational movement of the first shaft through the first gear and the second shaft through the second gear, wherein the relative rotation between the first shaft and the second shaft is caused by axially moving an oppositely oriented helical gear arrangement engaged with the first and second helical gears by axial movement of an input shaft, wherein axial movement of the input shaft and the oppositely oriented helical gear arrangement causes rotational movement of the first and second helical gears through engagement of the helical gear arrangement with the first and second helical gears to alter the phasing of the upstream roll relative to one of the folding rolls during operation of the interfolding machine. 6. The method as recited in claim 5, wherein the step of axially moving the input shaft is carried out by operation of a rotatable adjustment actuator and an adjustment shaft coupled to the adjustment actuator, wherein rotation of the adjustment actuator causes rotation of the adjustment shaft, and wherein the rotational movement of the adjustment shaft causes axial movement of the input shaft.