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1. (WO2017040648) AUTOMATIC PIEZO STROKE ADJUSTMENT

Pub. No.:    WO/2017/040648    International Application No.:    PCT/US2016/049681
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Sep 01 01:59:59 CEST 2016
IPC: B05C 5/02
H05K 13/04
H05K 13/08
B05B 1/30
B05C 11/10
Applicants: NORDSON CORPORATION
Inventors: BURZO, Christopher
GORMAN, Michael
LEWIS, Alan, R.
CROWELL, Cutler III
Title: AUTOMATIC PIEZO STROKE ADJUSTMENT
Abstract:
A method of calibrating the jetting profile includes applying voltage to a piezoelectric actuator (34) to move a valve closure structure (18) between non-impact and impact positions, sensing the position of the valve closure structure, establishing a reference point using voltage and position data, and using the reference point to adjust the voltage applied. Another method uses a mechanical stop to calibrate a jetting system. This method includes applying voltage to the piezoelectric actuator to move the valve closure structure between non-impact and impact calibration positions, sensing the position of the valve closure structure, generating voltage and position calibration data, establishing a master reference point using this data, and using the master reference point to determine wear of at least one of: the piezoelectric actuator and the valve closure structure. Another method of operating a jetting system includes the user inputting information into a control component. Another method involves using voltage data and the position data relating to a piezoelectric actuator for preventative maintenance of one or more components of the jetting valve.