Vacuum transport roller for web transport system

摘要

A printing system for printing on a print medium is disclosed. A linehead is disposed opposite a first side of the print medium, the linehead defining one or more print zones where a liquid is jetted onto the print medium. One or more vacuum transport rollers having a porous sleeve rotatable around a non-rotating core are disposed adjacent to a second side of the print medium and opposite the linehead. At least one of the vacuum transport rollers is aligned with one of the print zones of the linehead. The rotatable porous sleeve is engaged by the moving print medium that exerts a force on the porous sleeve, causing it to rotate. The core includes a vacuum manifold that outputs a vacuum force that operates on the print medium through the porous sleeve to deflect the print medium and causes the print medium to wrap around the vacuum transport roller(s).

主权项

1. A printing system for printing on a movable print medium, comprising:
a first linehead disposed opposite a first side of the movable print medium, the first linehead defining one or move print zones where a liquid is jetted onto the first side of the movable print medium; at least one transport roller that is not aligned with any of the print zones, the non-aligned transport roller further including a vacuum manifold that causes the movable print medium to deflect such that the wrap angle of the movable print medium around the non-aligned transport roller prevents the formation of a wrinkle in the movable print medium; one or more vacuum transport rollers having a porous sleeve rotatable around a non-rotating core, wherein the rotatable porous sleeve is engaged by the moving print medium that exerts a force on the porous sleeve causing it to rotate, the vacuum transport roller(s) being disposed adjacent to a second side of the movable print medium and opposite the first linehead, wherein at least one of the vacuum transport rollers is aligned with one of the one or more print zones of the first linehead; and the core including a vacuum manifold that outputs a vacuum force that operates on the second side of the movable print medium through the porous sleeve to defect the movable print and causes the movable print medium to wrap around the vacuum transport roller(s) while the porous sleeve is rotating.