Device for automatically clamping and releasing recording material and operation of said device

US5355156A · kind A · utility

Assignee

• Linotype-Hell AG · DE

Inventors

• Ralf Balzeit · Preetz, DE
• Gunnar Behrens · Kiel, DE
• Gerhard Bloehdorn · Schwentinental, DE
• Bernd Lassen · Mönkeberg, DE
• Hans Penza · Preetz, DE
• Norbert Roth · Kiel, DE

Key dates

• Filing date: Feb 18, 1992
• Grant date: Oct 11, 1994
• Expiry date: Feb 18, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N2201/04734
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

The invention is directed to a device for automatically clamping and releasing film material onto or, respectively, from the recording drum of a reproduction device with vacuum suctioning. The device is composed of a roll film cassette, of a conveying and guide surface, of a film cutting means, of a film length measuring means, of a pressure means having a pressure roller, of a lift-off means having lift-off finger, as well as drives for turning the recording drum and for conveying the film material to the recording drum. The recording drum comprises axially proceeding suction hole rows for suctioning the film material by vacuum. A vacuum distributor controllable by the rotational motion is arranged in the recording drum, this vacuum distributor successively connecting the individual suction hole rows to the stationary vacuum pump during clamping, so that the suction hole rows are charged with vacuum step-by-step with increasing wrap of the recording drum by the film material. Film material of different formats, particularly large formats, can be automatically clamped without the formation of folds and warping with the device and can be reliably fixed on the recording drum during t…