Lockstitch sewing machine in high-speed operation, oil lubrication system is particularly important. However, the problem of oil return often causes the engine oil to accumulate on the surface of the machine and flows out of the presser bar and needle bar. The fabric is soaked with oil that the machine does not work properly. Let's take a look at the pump oil return mechanism. Pump is driven by the vertical shaft rotation, the oil pump body has a plane, the pump body has a plunger hole, the spring pressure plunger. During the rotation, a vacuum is formed at the plane of the body of the oil pump to suck out the facial oil. When rotating to the oil hole, the piston will press against the plane of the body and push out the oil (see FIG. 1). In the event of a backflush, first check that the backfill of the panel felt is clogged with dirt or the pipe is crushed and if the return pipe is worn. If the above are normal, then the problem lies in the oil pump back to the system. In the usual repair, the author encountered the above situation, when no new pump can be changed, to take the following emergency measures. The oil pump body flat surface of the negative and then filing a plane out of the oil pump in the operation of the formation of two vacuum, body rotation can absorb more oil once a week, so that the facial oil can be sharply sucked J, temporarily solved the back Oil fault (see Figure 2). The above is the author to take emergency measures, I hope all fellow practitioners who saw the future can propose a better way, let us discuss and work together.
