of a sewing machine driving motor by a belt not shown to the main shaft of the sewing machine a knob 8 is adapted for actuating a sewing machine needle by the operator separate from the drive of the motor a partition 9 serves to close the open side of air blowing chamber 5 and guides a flow of air from the outside through a suction port 10 which is formed in partition 9 an air guide cover 11 guides the flow of the suctioned air to the rotating blades of the fan 4 the air guide cover 11 is disposed opposite to the fan 4 and covers suction port 10 thereby defining a space between the cover and the air guide plate 9 which guides the flow of the suctioned air the air guide cover 11 has an opening 12 having a diameter larger than that of the main shaft 3 but smaller than the circumference of the fan 4 an l shaped air guide pipe 13 has one end inserted into suction port 10 and the other end fitted into a waste housing or collector 14 the waste housing or collector 14 consists of an air guide plate 15 which is circular and having a notch at the base thereof and a waste receptacle 16 adapted to receive waste threads through the notch a filter 17 is between the waste collector 14 and.