| 摘要 |
A needle-selecting actuator (5) is surrounded by an intermediate ring (7) at the top, a lower ring (9) at the bottom, a needle cylinder (2) inside, and a cover (12) outside. A cylindrical chamber (13) is formed between the needle-selecting actuator (5) and the cover (12). The cover (12) is equipped with a ventilator fan (17) for feeding the air into the cylindrical chamber (13). The cylindrical chamber (13) has an opening (14, 15; 18) through which the air passes. The outside air is fed into the cylindrical chamber (13) through the means of ventilation/suction (17), and passes through said opening (14, 15; 18) to cool the needle cylinder (2) and its peripheral working components.
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