Endless flexible belt for a printing system
A flexible belt is disclosed for use in a printing system. The belt comprises an endless strip which, in use, travels along a continuous path. Formations are provided along the sides of the strip which are capable of engaging with lateral tracks to place the belt under lateral tension, the lateral tracks further serving to constrain the belt to follow the continuous path.
1. A method of installing a belt to a printing system comprising an image forming system at which drops of ink are deposited to form an image, an impression station at which the formed ink-images are transferred to substrate, and lateral tracks, the method comprising:
a. providing a flexible belt comprising an elongate strip wherein formations are provided along the sides of the elongate strip;
b. feeding the strip through the lateral tracks; and
c. attaching the ends of the strip to each other to form the endless loop, wherein after steps (a)-(c) are carried out: (i) the formations that are provided on each side of the elongate strip engage the lateral tracks in such a manner as to place the belt under width ways tension and to constrain the belt to follow a continuous path defined by the lateral tracks, and (ii) the belt has a degree of elasticity in a width ways direction that is greater than the elasticity of the belt in a longitudinal direction.
2. The method of claim 1 each of the lateral guiding tracks is of suitable cross-section to slidably retain the formations on the sides of the belt.
3. The method of claim 1 wherein the printing system comprises rollers around which, after steps (a)-(c) are carried out, the endless loop is mounted.
4. The method of claim 3 wherein said rollers are adjacent to print bars of the image forming station that overlie the belt.
5. The method of claim 4 wherein, after steps (a)-(c) are carried out, the adjacent rollers lie in a plane offset from a flat plane passing through the two tracks such that lateral tension in the belt, resulting from engagement of the formations in the tracks, serves to flatten the belt against the surfaces of the rollers.
6. The method of claim 1 wherein the belt is mounted over rollers, and wherein the ends of the elongate strip are slightly inclined relative to the lateral direction, so that after steps (a)-(c) are carried out and the slightly-inclined ends are attached to each other to form the endless loop, a presence of the slightly-inclined ends serves to avoid or mitigate a sudden change in tension as the belt passes circulates around the rollers.