| 摘要 |
PURPOSE:To prevent the lowering of function and to enhance safety, by providing a protruding piece moving by the mounting and detachment of a prefilter and a return spring to a front grill and performing the switching control of the microswitch of an electromotive part circuit by the protruding piece. CONSTITUTION:The protruding piece 3 movable by the pushing of a prefilter 2 is mounted to a front grill 1 having the prefilter 2 in a detachable manner and the spring 4 moving the protruding piece 3 in the detachment direction of the prefilter 2 when the prefilter 2 is detached is further provided to said grill 1. This protruding piece 3 pushes the lever 6 of a usually opening type microswitch 5 arranged to a power source circuit in series when the prefilter 2 is mounted and, as a result, a current is supplied to an electrode part 9 consisting of a power source and a counter electrode plate 8. When the front grill 1 is detached, both of the prefilter 2 and the protruding piece 3 are detached and, therefore, the lever 6 is released and the supply of current to a discharge wire 7 is stopped. |
