초록 ▼

An electrically operated fluid dispenser for dispensing a pattern of viscous fluid onto a substrate during a run mode. The dispenser is turned off and does not dispense the viscous fluid during a standby mode of operation. The dispenser includes a dispenser body having an outlet and an armature disp

An electrically operated fluid dispenser for dispensing a pattern of viscous fluid onto a substrate during a run mode. The dispenser is turned off and does not dispense the viscous fluid during a standby mode of operation. The dispenser includes a dispenser body having an outlet and an armature disposed in the dispenser body for movement between an opened position allowing a fluid flow from the outlet and a closed position preventing the fluid flow from the outlet. A coil is mounted adjacent the armature and selectively generates an electromagnetic field for moving the armature between the opened and closed positions. A controller includes different apparatus and methods for using the coil as a heater as well as providing other heat transfer devices on the dispensing valve to maintain a constant temperature either, during only the run mode or, during both, the run and the standby modes.

대표청구항 ▼

1. A method of operating an electric viscous fluid dispenser to dispense a viscous fluid onto a substrate during a run mode comprising:energizing a coil positioned with respect to an armature within the fluid dispenser with a drive current to actuate the fluid dispenser to dispense the viscous fluid

1. A method of operating an electric viscous fluid dispenser to dispense a viscous fluid onto a substrate during a run mode comprising:energizing a coil positioned with respect to an armature within the fluid dispenser with a drive current to actuate the fluid dispenser to dispense the viscous fluid onto the substrate in response to said drive current; and simultaneously varying said drive current to maintain said coil at a substantially constant temperature during the run mode.