It is advisable to clean your tool after each use. If your tool is particularly dirty or subject to rusting after exposure to moisture do not delay cleaning.
After cleaning it is advisable to oil the tool so as to protect it from corrosion. The oil will also unjam the tool.
It is advisable to sharpen your tool at least once a day but if you feel that your tool is not cutting as well as usual sharpen it right away
It is advisable to dismantle your tool on a regular basis but at the very latest when it appears to be jammed.