If you have an industrial sewing machine (I'm using my Consew 225 as an example,) you have a "work-horse" of a sewing machine. If you don't maintain it, though, it won't perform as well as it should.
How to Maintain an Industrial Sewing Machine
By: Laure Justice
One way to clean lint from the inner workings of your industrial sewing machine is to gently flick them away with a small paint brush.
Pay special attention to the bobbin case, making sure all signs of lint and bits of thread are gone.
Air Pressure Cleaning
While a brush will work, an air compressor nozzle or can of compressed air, like you use on a computer, are the best ways to clean your Consew sewing machine, or any industrial.
Just direct the air flow at the bobbin case and blow debris away from the sewing machine's moving parts.
Open the machine's upper cases, too, and clean around all moving parts.
Oiling the Industrial Sewing Machine
(Consew 225 Example) Oil your Consew each time you start it up, and oil the bobbin case with every other bobbin change to get the most out of your machine.
Frequent oiling is a must for the 225 model Consew, because the machine is capable of making 1,000 stitches per minute, and that's a lot of friction if the machine is not well-oiled.
Most of the spots you need to oil are marked with red paint, but you also need to add 2 or three drops of oil to the outer edge of the bobbin case, to the knuckle-shaped spot on the front of the machine's case, and to the moving places on the back of the machine.
You should also see two silver circles with little metal ball-bearings in the centers.
Press the tip of the oil can's nozzle on the metal balls and push down, then squirt a drop of oil in each of them.