Mecanism for cutting peat moss bale
I don't quite understand how you want to cut them. Maybe because I have no idea what peat moss is :P The diagram looks like you're talking about cutting the bottom off and leaving the offcut in place? That sounds like asking for the saw to pull the bales around or jam.
In my experience, in sawmills the saws are all making vertical cuts, and the logs are flipped over to cut different sides, then forced through the saws using knurled rollers pressed against them, or by being clamped to a moving carriage.