Method of operating a flat-bed die cutter

Patent metadata

Field	Value
Publication number	US-11524422-B2
Application number	US-202017123926-A
Country	US
Kind code	B2
Filing date	Dec 16, 2020
Priority date	Dec 18, 2019
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

In a method of operating a flat-bed die-cutter a printing substrate in the form of a web is fed to a die-cutting module of the flat-bed die-cutter, a web section is severed from the web and removed as waste. The web is guided through the die-cutting module and the web section is severed from the web in or downstream of the die-cutting module and removed as waste. Products are thus formed by die-cutting a web while reducing waste and periods of standstill.

First claim

The invention claimed is:

1. A method of operating a flat-bed die-cutter, the method comprising:
feeding a printing substrate in the form of a web to a die-cutting module of the flat-bed die-cutter and guiding the web through the die-cutting module;
severing a web section from the web downstream of the die-cutting module by either,
cutting the web section off by a cross-cutter that rotates or moves up and down and is different from a die-cutting knife of the die-cutting module; or
only partly cutting the web section off by a cross-cutter that rotates or moves up and down and is different from the die-cutting knife of the die-cutting module and then tearing off the web section; and

removing the web section as waste by at least one of winding the waste onto a winding roller, depositing web sections into a waste delivery or shredding the web sections;
operating the die-cutting module, during or after removing the web section, in-register at a matching speed relative to the speed of a printed image of a print on the web; and
starting the feeding of the web to the flat-bed die-cutter and guiding of the web through the die-cutting module at a beginning of a production run, continuing the feeding and guiding without interruption during the removal of the web section and the in-register die-cutting of the web at the matching speed, and not stopping the feeding and guiding until production ends.

2. The method according to claim 1 , which comprises moving the severed web section out of the die-cutting module by way of a pair of rollers.

3. The method according to claim 2 , wherein the cross-cutter is disposed upstream or downstream of the pair of rollers.

4. The method according to claim 1 , wherein a cross-cutter is disposed upstream or downstream of the pair of rollers.

5. The method according to claim 1 , which comprises removing the web sections out of a transport path by way of a deflector.

Assignees

• Heidelberger Druckmasch Ag

Inventors

• Schwab Werner

Classifications

• B26F1/44

  Cutters therefor; Dies therefor · CPC title

• B65H2601/272

  Skewing of handled material during handling · CPC title

• B26D7/1818 Primary

  by pushing out · CPC title

• B26D7/18 Primary

  Means for removing cut-out material or waste · CPC title

• B65H2301/51538

  Die-cutting · CPC title