Method for controlling the on-the-fly splicing of a web from a second roll to a web running off a first roll

US4077580A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Rainer Lang · Ratingen, DE
• Horst Matthiesen
• Manfred Rubruck

Key dates

• Filing date: Jan 13, 1977
• Grant date: Mar 7, 1978
• Expiry date: Jan 13, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2511/51
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A method for controlling the on-the-fly splicing of a web wound on a first roll to a web wound on a second roll, wherein the first roll is being unwound and the second roll is set in rotation. The method comprises the steps of: transferring a roll carrier supporting the first and second roll from the unwind position to the pasting position, when the first roll reaches one of a first diameter and first circumference value; accelerating the second roll until its peripheral velocity is equal to the velocity of the unwinding web on the first roll, when the first roll reaches one of a second diameter and second circumference value; and operating a pasting and cutting means for pasting the web of the second roll beginning at the pasting tip of the web of the second roll, to the web running off the first roll and for cutting the web running off the first roll at the end of the pasting tab formed by the pasted section of the first and second rolls when the first roll reaches one of a third diameter and third circumference value. In accordance with the invention, the method further comprises the step of continuously calculating the aforesaid diameter or circumference values from a predeterm…