Compressible nip rolls for multiribbon transport
View Patent ↗A folder superstructure includes a former, a first nip roll located downstream of the former and having a compressible outer layer, and a second nip roll forming a nip with the first nip roll. A nip roll for nipping a plurality of superimposed printed ribbons or webs is also disclosed, the nip roll including a roll body and a compressible layer disposed about the roll body. A method for operating a printing press is also provided.
1. A folder superstructure for a printing press comprising:
a former processing a plurality of superimposed printed ribbons or webs; and
a first nip roll and a second nip roll forming a nip and nipping the plurality of superimposed printed ribbons or webs received from the former, the first and second nip rolls each including a roll body and a compressible layer disposed about the roll body.
2. The folder superstructure as recited in claim 1 wherein the compressible layer is made of a foamed material.
3. The folder superstructure as recited in claim 1 wherein the compressible layer has a Poisson's ratio of 0.50 or less.
4. The folder superstructure as recited in claim 1 wherein the compressible layer is made of urethane with gas inclusions.
5. The folder superstructure as recited in claim 1 wherein the compressible layer is made of rubber with gas inclusions.
6. The folder superstructure as recited in claim 1 wherein the first nip roll and the second nip roll draw the plurality of superimposed ribbons or webs over the former.
7. The folder superstructure as recited in claim 1 further comprising a motor driving the first nip roll and second nip roll.
8. The folder superstructure as recited in claim 7 wherein the motor is an independent phase-controlled motor.
9. The folder superstructure as recited in claim 1 wherein the first nip roll includes a hollow body fixed to an axle via screws or bolts.
10. The folder superstructure as recited in claim 9 further comprising a motor driving the axle.
11. The folder superstructure as recited in claim 1 further comprising:
a second former processing a second plurality of superimposed printed ribbons or webs; and
a second former first nip roll and a second former second nip roll forming a second nip and nipping the second plurality of superimposed printed ribbons or webs received from the second former, the second former first and second former second nip rolls each including a second roll body and a second compressible layer disposed about the second roll body.
12. The folder superstructure as recited in claim 11 further comprising a common axle, the first nip roll and second former nip roll each being connected on the common axle.
13. The folder superstructure as recited in claim 12 further comprising a motor driving the common axle.
14. The folder superstructure as recited in claim 13 wherein the motor is an independent phase-controlled motor.
15. The folder superstructure as recited in claim 12 wherein the first nip roll includes a hollow body fixed to the common axle via screws or bolts.
16. A folder superstructure for a printing press comprising:
an RTF receiving a plurality of superimposed printed ribbons or webs;
a former contacting the plurality of superimposed printed ribbons or webs; and
a first nip roll and a second nip roll forming a nip and nipping the plurality of superimposed printed ribbons or webs received from the former, the first and second nip rolls each including a roll body and a compressible layer disposed about the roll body.