Invention Grant
US09304028B2 Adhesive dispensing device having optimized reservoir and capacitive level sensor 有权
具有优化的储存器和电容式液位传感器的粘合剂分配装置

Adhesive dispensing device having optimized reservoir and capacitive level sensor
Abstract:
An adhesive dispensing device includes a heater unit for melting adhesive, a fill system communicating with a receiving space for feeding the heater unit, and a reservoir for receiving melted adhesive from the heater unit. The dispensing device also includes a capacitive level sensor located along a sidewall of the receiving space such that the level of adhesive in the receiving space can be detected by sensing the difference in dielectric capacitance where the adhesive is located compared to where air acts as the dielectric. The size of the driven electrode produces a broader sensing window capable of generating multiple control signals corresponding to different fill levels of adhesive. The receiving space and reservoir are minimized in size so that adhesive is not held at elevated temperatures long enough to char or degrade.
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