Patent ID: 7739952
Filing Date: 2010-06-22
Classification: B41F,B41J,B65H

Abstract:
1. A printing apparatus for printing on a web of printing paper while transporting the printing paper along a predetermined transport path, comprising: a plurality of measuring parts for measuring the tension of said printing paper in a plurality of locations, respectively, along said transport path; a plurality of transport parts for transporting said printing paper near said plurality of measuring parts, respectively; and a controller for controlling the transport speed of said printing paper in said plurality of transport parts, based on tension values measured by said plurality of measuring parts, (i) said controller controlling the transport speed of said printing paper in a first transport part with a controlling target so that a tension value measured by one of said plurality of measuring parts which is located near said first transport part approaches a predetermined value, said first transport part being located most upstream among said plurality of transport parts, (ii) said controller controlling the transport speed of said printing paper in a second transport part with the controlling target so that tension values measured by two of said plurality of measuring parts which are located immediately upstream and downstream of said second transport part are referenced and that the two measured tension values approach each other, said second transport part being included among said plurality of transport parts, and only said first transport part among said plurality of transport parts being controlled with a control target using said predetermined value as a target value.