Sheet-fed printing machine with a humidification device

Patent metadata

Field	Value
Publication number	US-11014377-B2
Application number	US-201916503780-A
Country	US
Kind code	B2
Filing date	Jul 5, 2019
Priority date	Jul 5, 2018
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A sheet-fed printing machine contains a printing unit, a drier, and a sheet handling device for transporting or guiding print sheets. The sheet handling device has an opening disposed downstream of the drier in the direction of transport. A humidification device for rehumidifying the print sheets is disposed in such a way that it rehumidifies the print sheets through the opening. The sheet handling device may contain a guide plate or several guide plates.

First claim

The invention claimed is:

1. A sheet-fed printing machine, comprising:
a printing unit;
a drier;
a sheet guide for transporting or guiding print sheets, said sheet guide having an opening formed therein and disposed downstream of said drier in a direction of sheet transport; and
a humidifier for rehumidifying the print sheets and disposed in such a way that said humidifier rehumidifies the print sheets through said opening, said humidifier having a format adjustment device for adapting a humidification width to a width of a respective format of the print sheets.

2. The sheet-fed printing machine according to claim 1 , wherein said opening is defined by a window in said sheet guide or by a gap between two components of said sheet guide.

3. The sheet-fed printing machine according to claim 1 , wherein said humidifier has a spray device.

4. The sheet-fed printing machine according to claim 1 , wherein said drier is a thermal drier.

5. The sheet-fed printing machine according to claim 1 , wherein said printing unit has an inkjet print head.

6. The sheet-fed printing machine according to claim 1 , wherein said sheet guide has at least one sheet-guiding plate delimiting said opening.

7. The sheet-fed printing machine according to claim 1 , wherein said sheet guide has at least one conveyor belt delimiting said opening.

8. The sheet-fed printing machine according to claim 1 , wherein said format adjustment device has at least one format cover.

9. A sheet-fed printing machine, comprising:
a printing unit;
a drier;
a sheet guide for transporting or guiding print sheets, said sheet guide having an opening formed therein and disposed downstream of said drier in a direction of sheet transport; and
a humidifier for rehumidifying the print sheets and disposed in such a way that said humidifier rehumidifies the print sheets through said opening, said humidifier having a timing device for generating a spraying cycle.

10. The sheet-fed printing machine according to claim 9 , wherein said timing device has a cyclic cover.

11. The sheet-fed printing machine according to claim 9 , wherein:
said humidifier has a housing and a feed line for feeding a fluid to said housing; and
said timing device has an actuator for alternately aligning an outlet of said feed line into an active position and a passive position.

12. The sheet-fed printing machine according to claim 9 , wherein:
said humidifier has a spray jet; and
said timing device contains a blower that is directed towards said spray jet of said humidifier and, while a sheet gap between said print sheets passes, blows through said sheet gap against said spray jet in such a way that said spray jet is diverted.

13. A sheet-fed printing machine, comprising:
a printing unit;
a drier:
a sheet guide for transporting or guiding print sheets, said sheet guide having an opening formed therein and disposed downstream of said drier in a direction of sheet transport; and
a humidifier for rehumidifying the print sheets and disposed in such a way that said humidifier rehumidifies the print sheets through said opening, said humidifier having a spin tray.

14. A sheet-fed printing machine, comprising:
a printing unit;
a drier;
a sheet guide for transporting or guiding print sheets, said sheet guide having an opening formed therein and disposed downstream of said drier in a direction of sheet transport, an opening width of said opening in the direction of transport is no more than 30% of a sheet length of a maximum processable format of the print sheets; and
a humidifier for rehumidifying the print sheets and disposed in such a way that said humidifier rehumidifies the print sheets through said opening.

Assignees

• Heidelberger Druckmasch Ag

Inventors

• Ruppaner Christoph
• Haas Claudius
• Leva Markus
• Angst Uwe
• Fellenberg Ulrich
• Klein Edmund
• Boettger Andreas
• Wilhelm Sebastian
• Hachmann Peter

Classifications

• B41J11/0015 Primary

  for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing (selective coating B41J2/2114) · CPC title

• B41J11/002 Primary

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

• B41J11/0022

  using convection means, e.g. by using a fan for blowing or sucking air · CPC title

• B41J11/00216

  using infrared [IR] radiation or microwaves · CPC title

• B41F21/08

  Combinations of endless conveyors and grippers · CPC title