Apparatus for gathering folded sheets in bookbinding machines

US4085927A · kind A · utility

Assignee

• Grapha-Holding AG · CH

Inventor

• Hans Muller · Sandhausen, DE

Key dates

• Filing date: Oct 27, 1976
• Grant date: Apr 25, 1978
• Expiry date: Oct 27, 1996

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2301/4531
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A gathering apparatus for folded sheets which are stored in several magazines at a level above the upper reach of an endless chain conveyor has suction heads which withdraw the folded backs of sheets from the respective magazines, rotary transfer members which complete the withdrawal of sheets from the respective magazines, pairs of rotary spreading members which open each withdrawn sheet at a level above the upper reach of the conveyor in such orientation that the front edge portions of the opened sheet are located at a level below the folded back of the sheet, and stationary guide members which flank the upper reach of the conveyor and guide the front edge portions of sheets during downward movement of sheets from the range of the respective spreading members toward the upper reach of the conveyor. The downward movement of sheets is promoted by nozzles which discharge air streams downwardly toward the outer sides of opened sheets and are preferably mounted in the guide members. Additional nozzles are mounted between successive magazines to discharge air streams which prevent shifting, lifting or other stray movements of sheets relative to the upper reach of the conveyor.