The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 2000
Filed:
May. 11, 1998
Douglas B Dority, Mill Valley, CA (US);
Thomas P DeVito, Santa Rosa, CA (US);
Golden Gate Microsystems, Inc., San Rafael, CA (US);
Abstract
A glue head delivers lines or spots of glue onto a substrate, such as packaging materials, with precision positioning of the glue pattern, with short and balanced on/off compensation times essentially independent of glue pressure, and at high nozzle velocity. Pressurized glue advances into a plenum of the glue head preferably in a horizontal direction, then into a short and low-volume exit tube and through a nozzle, flowing in a direction perpendicular to the inflow direction. Flow to the nozzle is closed by a diaphragm valve comprising flexible elastomeric material which seats against the upstream end of the exit tube. An important feature is that glue actuator pressure is balanced, and smooth operation and glue delivery are achieved, by a rocker arm above the glue valve which, when the valve is closed by pushing the elastomeric material against the glue delivery tube, releases pressure on the glue at an upstream point in the glue plenum. The rocker arm works by opposed action at two bores into the plenum; when the valve is opened, the diaphragm at the upstream bore is pushed inwardly, and when the valve is closed the upstream bore diaphragm is allowed to push outwardly. This balances pressure on the rocker arm, so that only a light spring urges the valve toward closed and solenoid opening force is very light, and also provides volume compensation, balance and smoother operation without hydraulic hammering.