| 摘要 |
A feeder for a blending line of the type having a weigh pan, an inclined spiked apron conveyor for delivering fiber material to a location above the pan so that the material falls by gravity into the pan, a doffer and Sargent comb for opening the fibers as they move on the apron conveyor and fall off the conveyor respectively and a single electric motor for operating the doffer, comb and apron conveyor and control circuitry for operating a plurality of such feeders in a blending line. To minimize wear on the motor, the control circuitry operates a clutch mechanism for clutching the apron conveyor on and off, while the motor and the doffer and comb operated by it run continuously. The control circuitry is capable of being operated in a weigh mode and in a second volumetric mode in which the pans are kept continuously open and the feeders continually deliver fibers to a blending conveyor moving beneath the pan. When the conveyor is stopped by the opening of a switch operated by the equipment which receives the fibers on the conveyor beneath the weigh pans, the clutch mechanism which clutch on and off the apron conveyors are deactivated so that no further fibers are delivered but the feed motors continue to run. A manually operated switch is shifted when the circuitry is to operate in the volumetric mode so that the conveyor runs continuously and so that a continuous current path is created through the dump valve relays to keep the pans open, thus eliminating the necessity to manually cut off air to the dump valves.
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