초록 ▼

A hot melt adhesive applicator including a dispenser head or block having a liquid chamber in one end portion and a cartridge cavity in the opposite end portion communicating through a stem passage and further comprising a replacable needle valve cartridge including a valve body containing a pneumat

A hot melt adhesive applicator including a dispenser head or block having a liquid chamber in one end portion and a cartridge cavity in the opposite end portion communicating through a stem passage and further comprising a replacable needle valve cartridge including a valve body containing a pneumatically actuated valve having a valve stem depending below the valve cartridge body through the stem passage and the liquid chamber for opening and closing the orifice in the nozzle assembly at one end of the liquid chamber. The dispenser head or block is modular and adapted to receive one or more valve cartridges and is provided with a liquid passage communicating with the liquid chamber and a source of liquid under pressure, and an air passage communicating with the air chamber in the cartridge within the cartridge cavity and also communicating with a source of compressed air. The dispenser head is preferably heated in order to maintain the hot melt adhesive in the liquid chamber in a liquid condition.

대표청구항 ▼

An applicator apparatus for dispensing hot melt adhesive comprising: (a) a dispenser head having first and second opposed end portions, (b) a cartridge cavity within said head and opening through said first end portion, (c) a liquid chamber formed within, and structurally a part of, said head, and h

An applicator apparatus for dispensing hot melt adhesive comprising: (a) a dispenser head having first and second opposed end portions, (b) a cartridge cavity within said head and opening through said first end portion, (c) a liquid chamber formed within, and structurally a part of, said head, and having an opening through said second end portion, (d) nozzle means having an orifice mounted in said opening, (e) a stem passage formed within, and structurally a part of, said head, and extending between said cartridge cavity and said liquid chamber, (f) a liquid passage in said head in fluid communication with said liquid chamber and adapted to communicate with a source of liquid, (g) an air passage in said head in fluid communication with said cartridge cavity and adapted to communicate with a source of compressed air, (h) a modular valve cartridge removably mountable in said cartridge cavity in operative position, (i) said cartridge comprising a valve body and a valve stem operable in said valve body, (j) said valve body having first and second end portions, said second end portion terminating on the opposite side of said stem passage from said liquid chamber, in operative position, (k) said valve stem projecting from said second end portion of said valve body, through said stem passage and said liquid chamber into said nozzle means for opening and closing said orifice, in said operative position, (l) said stem passage being just large enough in cross-section to receive only said valve stem for coaxial reciprocable movement, (m) valve actuator means within said valve body for controlling said valve stem to open said orifice in response to an increase in air pressure, and (n) an air port within said valve body in fluid communication between said air passage and said valve actuator means, in said operative position.