---
publication_id: "OT-2026-000001424"
title: "Device and method for unstacking a stack"
published_at: "2026-09-15T19:05:45.368767Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000001424"
categories:
  - "material-handling/conveying-systems"
keywords:
  - "b65g59/023"
  - "b65g59/023"
  - "b65g59/02"
---

# Device and method for unstacking a stack

## Abstract

A device for unstacking a stack that is constructed of part-stacks of flat printed products arranged next to one another and on top of one another. The device has a separating apparatus for forming a gap between a respective part-stack and the stack, and a gripping apparatus for gripping and lifting the respective part-stack utilizing the gap. A first robot moves the gripping apparatus during unstacking and a second robot moves the separating apparatus separately. The two robots may be structurally identical gantry robots on a common gantry frame. The processing speed may be increased when depalletizing stacks due to process parallelization. The unstacking process is particularly suitable in a postpress context where printed products are further processed.