SHEET SUPPLY OR WEB SUPPLY PRINTING MACHINE

摘要

PROBLEM TO BE SOLVED: To improve the security of human intervening for maintenance purposes.SOLUTION: A sheet supply or web supply printing machine includes: a main unit (1); at least one mobile carriage (2) adapted to be coupled to the main unit for cooperation therewith during printing operations and to be moved away from the main unit during maintenance operations; a control unit for controlling displacement of the mobile carriage toward and away from the main unit (1); and an access zone (9, 9') surrounding at least partly the mobile carriage for allowing an operator to get access to the main unit and the mobile carriage; wherein the access zone lies outside the displacement path (10) of the mobile carriage. The printing machine further includes a detection means (11) for monitoring the access zone and detecting the presence of the operator within the access zone. The displacement of the mobile carriage is interrupted or prevented in the case that the presence of the operator within the access zone is detected by the detection means and before the operator intrudes in the displacement path of the mobile carriage.