Method for controlling the temperature of a sheet in a printing machine

Patent metadata

Field	Value
Publication number	US-9815296-B2
Application number	US-201615279764-A
Country	US
Kind code	B2
Filing date	Sep 29, 2016
Priority date	Nov 18, 2015
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A method for controlling the temperature of a sheet in a printing machine includes measuring initial temperatures in zones on the sheet. Segments of an emitter are actuated in different ways as a function of the measured initial temperatures for irradiating cooler zones to a greater extent and warmer zones to a lesser extent or not at all. A common final temperature or at least a homogenization of the temperature is therefore achieved in the zones.

First claim

The invention claimed is:

1. A method for controlling the temperature of a sheet in a printing machine, the method comprising the following steps:
measuring initial temperatures in zones of the sheet before irradiating; and
individually actuating segments of an emitter as a function of the initial temperatures measured before irradiating to irradiate cooler zones to a greater extent and warmer zones to a lesser extent or not at all to attain a common final temperature or at least a homogenization of the temperature in the zones.

2. The method according to claim 1 , which further comprises carrying out the measurement of the sheet temperature and the temperature homogenization in the sheet two-dimensionally.

3. The method according to claim 1 , which further comprises using the emitter to apply a negative or inverse radiation power profile to the sheet relative to an initial temperature profile of the sheet.

4. The method according to claim 1 , which further comprises subdividing the emitter into a row of segments extending along a circumference of a sheet-transporting drum of the printing machine.

5. The method according to claim 4 , which further comprises using a control unit to individually actuate every segment in terms of its radiation power and activation phase.

6. The method according to claim 5 , which further comprises subdividing every segment into a respective row of subsegments.

7. The method according to claim 6 , which further comprises actuating the subsegments in accordance with an actual value versus target value comparison by the control unit.

8. The method according to claim 1 , which further comprises using a first sensor system to successively measure the initial temperatures of the zones disposed behind one another in a sheet transport direction.

9. The method according to claim 8 , which further comprises forming the zones into a checkered pattern of rectangular zones, and using the first sensor system to measure the initial temperature in each one of the rectangular zones.

10. The method according to claim 8 , which further comprises using a second sensor system to measure the attained final temperature in each zone.

Assignees

• Heidelberger Druckmasch Ag

Inventors

• Mueller Andreas
• Knabe Alexander
• Mueller Rolf
• Mueller Kai Oskar
• Hachmann Peter
• Gieser Michael
• Dolz Wolfgang
• Schmidt Thomas

Classifications

• B41J2/01

  Ink jet · CPC title

• B41J2/42

  for heating selectively · CPC title

• B41J11/002 Primary

  Curing or drying the ink on the copy materials, e.g. by heating or irradiating · CPC title

• B41J2/355 Primary

  Control circuits for heating-element selection · CPC title

• B41J11/00212 Primary

  Controlling the irradiation means, e.g. image-based controlling of the irradiation zone or control of the duration or intensity of the irradiation · CPC title