Apparatus for convoluting webs onto rotary cores

US4218032A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Erich Nagel · Anzing, DE
• Wolfgang Zahn
• Heinz Kolbl · Munich, DE
• Horst Wildner · Munich, DE
• Ernst Ismann
• Siegfried Bartel · Gauting, DE
• Ernst Biedermann · Regensburg, DE
• Karl D. Dreher · Littleton, US

Key dates

• Filing date: Feb 21, 1979
• Grant date: Aug 19, 1980
• Expiry date: Feb 21, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B17/26
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Apparatus for convoluting a web of photographic material onto a rotary core in a lighttight cassette has an elongated channel which is pivotably mounted in the cassette and whose outlet is normally tangential to the peripheral surface of the core. The outlet of the channel is detachably or permanently connected with a flexible or deformable strip-shaped element in the form of a link chain, plastic band, textile band or metallic band which surrounds a substantial part of or the entire peripheral surface of the core. When the leader of a web is introduced into and advanced beyond the outlet of the channel while the core rotates in a direction to convolute the web, the foremost part of the leader penetrates between the core and the flexible element and adheres to the peripheral surface of the core not later than upon the making of approximately two convolutions. During winding, the flexible element insures that the neighboring convolutions of the web on the core are tightly packed against each other. When the web is being withdrawn, the flexible element brakes the web and prevents clockspringing of convoluted material.