Paper stacker

US4030720A · kind A · utility

Inventor

• Gary E. Jones · Mesa, US

Key dates

• Filing date: Feb 17, 1976
• Grant date: Jun 21, 1977
• Expiry date: Feb 17, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S400/902
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A continuous web of perforated paper is withdrawn from a buffer zone and fed at a constant linear rate through an oscillating chute device unto a folded stack. The feeding and folding motions imparted to the web are synchronized through control over stepper motors respectively driving the paper feeding and folding devices. A pulse generator produces a common train of digital pulses that are fed to a pair of frequency dividers within which the pulses are divided into two trains of driving pulses at different pulse rates. The driving pulses are simultaneously fed to the stepper motors for operation at different rates during a paper stacking cycle initiated after the paper is detected at the bottom of the buffer zone by a sensor switch. The driving pulses are monitored to produce error signals whenever synchronization is lost or malfunction occurs.