| 摘要 |
<p>A sewing machine includes a housing having an oil pan portion defining an oil reservoir with a filter supported on a wall of the sewing machine housing in a position above the reservoir. A pump is employed to direct the lubricating oil upwardly through a pipe connection into the top of the filter and a portion of the oil which is pumped is circulated through a small size tube in a continuous manner such that it is deflected against a viewing glass at the top of the sewing machine and drops down into the operating mechanism contained in the sewing machine housing. In addition, a portion of the oil which is pumped into the filter passes through a removable filter cartridge and into the interior of the filter. Before it is passed to any of the bearing parts of the main shaft, it is directed through a top opening in an upstanding pipe of an insert in the filter and downwardly through the pipe at the interior of the filter after having been filtered by passing through the filter material of the filter from the outside part of the filter housing and is then fed under pressure to the various bearing surfaces. The filter housing also includes a drain opening at the lower end thereof which is arranged so that it is closed by insertion of a filter with an annular sealing cap and its sealing member so that it covers the drain opening when the filter element is in an operative position inserted in the filter housing. When oil is to be drained, the filter element is removed upwardly to uncover the drain opening first so that little, if any, unfiltered oil will be able to move downwardly through the pipe having the inlet for the force feeding of the bearings.</p> |
