I have discussed the issue of the Sensei sweeping the dojo and students asking to take the broom from him. Often, the Sensei and seniors will say "no" and keep sweeping.
If a junior wants to sweep the dojo, he should come to class early enough to get the broom before the Sensei and seniors. That way, he will not have to ask (and there can be no refusal).
Students should learn to do what needs to be done before anyone can ask -- to anticipate the need and address it.
Respectfully,
Charles C. Goodin
