Question about Poulan Garden
There are two "impulse line(s)" on a typical "2 stroke chain saw.
One goes from the intake or crank case to the carburetor to drive the diaphragm "pump". Sometimes this "line" is built into the intake or transfer port and back to the carb by passage ways drilled into each and mating thru the gasket. The pressure pulses drive the "pumper carb" to deliver the gas, whether the upside down, sideways or vertical.
The other impulse line will go from the intake or crank case (between the carb and crank case) to the chain oil reservoir to lube the chain.
The pressure pulses (pos or neg) will drive the very simple oil pump to lube the chain thru passageways and/or tubes between the "bar oil" tank and the engine case where the chain bar is clamped to the engine. There are crossing slots in the case and bar that allow oil to flow and the bar to be adjusted in/out to tighten the chain. An internal passageway in the bar from the crossing slot to the chain groove gets the oil to the chain. Always be sure to clean these passages with a copper wire periodically as they tend to get clogged with very fine wood shavings.
Posted on Jun 01, 2014
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Posted on Jan 02, 2017
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An impulse sealer heat-seals objects by sending high current on impulse to a heater ribbon, equipped on the surface of the heat-sealing blade, to generate heat that enables thermal-sealing through thermal conductivity. The section to be sealed is placed between the heat-sealing blades, pressed and thermal-fused when current and heat are delivered on impulse through the heater ribbon. After the current stops the seal remains under pressure to cool and to give it a clean finish.
(Source: The Hoso Times, published by Nippo Co., Ltd.)
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