The invention pertains to a cross-linkable resin composition which is obtainable from the reaction of glyoxylic acid and a hydroxy andor epoxy group-containing polymer in the absence of amino-containing cross-linkers, characterized in that 0. The switching element controls a drive of the brushless motor. Memory requirements are optimized by having members which do not have overlapping lifetimes share the same memory location. The handle part is disposed at the belt unit main frame.