Stacker jam detector

US5533719A · kind A · utility

Assignee

• Roll Systems, Inc. · US

Inventors

• H. W. Crowley · Newton, US
• John W. Clifford · Ashland, US
• Thomas Connolly · Windom, US
• John Robert Fairhurst · Plaistow, US
• Bruce J. Taylor · Manchester, US
• John M. Fiske · Medford, US

Key dates

• Filing date: Jan 13, 1994
• Grant date: Jul 9, 1996
• Expiry date: Jan 13, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2557/33
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A stacker jam detector, for use in a sheet handling device such as a stacker and separator, comprises a source of sheets that directs sheets downstream to a delivery location. The source of sheets includes a sheet sent signal generator that transmits a sheet sent signal in response to transferral of each of the sheets from the source. A moving sensing service, such as an elastomeric wheel, is provided at a delivery location, which can comprise a vertical stack. The surface engages each of the sheets as each of the sheets is transferred to the delivery location. Movement of the sheets thereover causes proportional movement of the sensing surface. A signal, such as a pulse, is generated in response to the movement of the sensing surface. A detector measures the signal and compares the signal received relative to at least one sheet sense signal to a predetermined signal value and indicates whether a sheet has been properly delivered to the delivery location.