Hold-down device on handling machines, in particular punching machines, for thin, flat objects in particular sheets of paper

US5348285A · kind A · utility

Assignee

• Blohm & Voss GmbH · DE

Inventor

• Peter Huser · Ellerau, DE

Key dates

• Filing date: Jan 21, 1993
• Grant date: Sep 20, 1994
• Expiry date: Jan 21, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2801/42
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

In handling machines, in particular punching machines, operating in discrete steps, for sheets of paper or similar objects, a warping, waving or wrinkling of the sheets occurs during the deceleration movements of the sheets ahead of the delivery station. These deformations are smoothed by the hold-down device according to the invention, which consists of a circulating perforated endless belt, to which an underpressure is applied from below. There is also synchronization between the feed movement of the sheets and the movement of the endless belt.