Ultrasonic welding
US4696708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1985 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Nov 13, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/944
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The ultrasonic energy applied to a workpiece to be welded in an ultrasonic welding operation, over a predetermined welding time, is measured by processing the output of a load cell beneath the workpiece to produce a signal voltage for comparison with a predetermined reference voltage corresponding to the accumulated ultrasonic energy that should have been applied to the workpiece during said predetermined time to satisfactorily weld the workpiece. A one-shot timer is started at the commencement of the welding operation. If the comparison reveals that signal voltage has reached the reference voltage before the timer has run out, a success signal is generated to indicate the completion of the welding operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.