| 摘要 |
A sewing machine comprises a machine housing, a main shaft rotatably mounted on the machine housing, a needle bar swingably mounted and vertically reciprocated by the main shaft, a feeding device operated in time relationship with the needle bar, an electric motor for controlling the lateral movement of the needle bar, another motor for controlling the movement of the feeding device, and a pulse generating unit for generating pulses controlling the operation of the first and second electric motors. The pulse generating unit comprises two rotational parts cooperating with two pulse generators which respond to the presence and absence of the rotational parts. The two rotational parts are each formed with an axial extension with a recess and a projection. A ring member receives the axial extensions of the rotational parts to connect them to each other and, when the ring member is secured to the main shaft, to connect them to the main shaft of the machine. |
