Printing press roll and cylinder
A press pull roll for moving a printing web through a printing press, especially through a folder, includes a roll body which moves the web, and a motor inside the roll body for driving the roll body in rotation. The motor includes a stationary spindle having stator windings, and rotor windings fitted in the roll body. The press pull roll is preferably one of a pair of press pull rolls forming a nip, wherein the second press pull roll may also incorporate a motor, or may be driven by the first press pull roll.
1 . A press pull roll for moving a printing web through a printing press, the pull roll comprising:
a roll body which moves the web; and
a motor inside the roll body for driving the roll body in rotation.
2 . The press pull roll of claim 1 wherein the motor comprises:
a stationary spindle having stator windings;
rotor windings fitted in the roll body.
3 . The press pull roll of claim 2 wherein the stationary spindle is a tubular spindle.
4 . The press pull roll of claim 3 further comprising electrical cables extending into the tubular spindle to the stator windings.
5 . The press pull roll of claim 3 further comprising electrical cables extending into the tubular spindle to devices comprising at least one of a rotational speed sensor and a temperature sensor.
6 . The press pull roll of claim 3 further comprising coolant lines extending into the tubular spindle.
7 . The press pull roll of claim 2 wherein the stationary spindle has a proximal end fixed to a stationary wall of the press.
8 . The press pull roll of claim 1 wherein the roll body has an external diameter and a length, the ratio of the external diameter to the length being greater than 1:1.
9 . A pair of press pull rolls comprising
a first press pull roll comprising a roll body and a motor inside the roll body for driving the roll body in rotation; and
a second press pull roll positioned in parallel with the first press pull roll to form a nip in which the web is guided in order to move the web through the press.
10 . The pair of press pull rolls of claim 9 wherein the second press pull roll is driven in rotation by the first press pull roll.
11 . The pair of press pull rolls of claim 9 wherein the second press pull roll comprises a roll body and a motor inside the roll body for driving the roll body in rotation.
12 . The pair of press pull rolls of claim 9 wherein the motor comprises a stationary spindle having stator windings, and rotor windings fitted in the roll body.
13 . The pair of press pull rolls of claim 9 wherein the first press pull roll is mounted in a fixed location on a stationary wall of the press, and the second press pull roll is mounted on the stationary wall so that it can be displaced in order to adjust the nip.
14 . The pair of press pull rolls of claim 9 wherein the first and second press pull rolls can be driven at different speeds.
15 . The pair of press pull rolls of claim 14 wherein the difference in speeds depends on the effective diameter of the rolls and the thickness of the web.
16 . The printing press cylinder of claim 13 wherein the stationary wall is the wall of a folder of the press.
17 . A printing press cylinder which is one of a forme cylinder and an impression cylinder of a printing unit, the cylinder comprising:
a cylinder body which moves the web; and
a motor inside the roll body for driving the cylinder body in rotation.
18 . The printing press cylinder of claim 17 wherein the motor comprises:
a stationary spindle having stator windings; and
rotor windings fitted in the cylinder body.
19 . The printing press cylinder of claim 18 wherein the stationary spindle is a tubular spindle, the press cylinder further comprising at least one of electrical cables and coolant lines extending into the tubular spindle.