DEVICE FOR LUBRICATING BEARINGS OF LINK-AND-LEVER THREAD PULLER AND NEEDLE GUIDE CONNECTING ROD OF SEWING MACHINE Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: device has means for oil feed to the stationary axle of a connecting member of the thread puller and to the bush of a main shaft. The main shaft has a helical oil racing groove and is connected to the connecting rod of the needle guide and the thread puller by a crank fastened to the main shaft and a double-knee pin fixed in the crank. An annular cavity coinciding with the end of the oil racing groove and channels coming out of the cavity are made in the crank. One channel is connected to channels made in the double-knee pin and feeding the oil to the bearing of needle guide connecting rod. The other channel is connected to channels in the double-knee pin which feed the oil to the bearing of the lever of the thread puller. A system of channels with inlet hole at the stationary axle of the connecting member and outlet holes at the movable axle of the connecting member and the thread puller lever is made inside the connecting member of the thread puller. The annular cavity in the crank is made in the form of a truncated cone, and the channels are inclined to the axis of the main shaft. EFFECT: improved structure. 2 cl, 4 dwg