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why does drive belt keep coming off the pulley?

Why does the drive belt keep coming off the pulley on my Suffolk Punch 14SK? I replace it then after a few seconds it pops off again. How can I rectify the problem?
Allen, August 2010
Thanks but . . . . . what is the "Belt adjuster" and how to "tighten it"? Thanks

Stuart, June 2015
tighten up the belt adjuster

pleasant, August 2010