Device for the lubrication of the rotating hook in a sewing machine

A device for the lubrication of a rotating hook in a sewing machine, comprising:

• a hook shaft having a hollow interior axially thereof;
• inlet means and outlet means communicating with the hollow interior of said hook shaft for prevention of oil build-up therein as oil is supplied from an oil reservoir to said hollow interior through said inlet means;
• means between said inlet means and said outlet means for decreasing the diametrical extent of said hollow interior;
• one end of said hollow hook shaft being closed off and being provided with an oil supply channel having an axis concentric with said longitudinal axis of said hook shaft;
• a porous material positioned within said hollow interior adjacent to said closed off end of said hollow hook shaft;
• and
• a spring surrounding said porous material.

A device for the lubrication of a rotating hook in a sewing machine, comprising:

• a hook shaft having a hollow interior substantially axially thereof;
• an inner portion of said hook shaft between an inlet means and said outlet means having an inner diametrical extent less than the diametrical extent of the inner portions on each side of said inner portion;
• and
• means coupling said inlet means to an oil reservoir and fully communicating therewith for supplying oil to said hook shaft, thereby preventing oil pressure build-up therein as oil is supplied from said oil reservoir to said hollow interior through said inlet means and free of any pressure control of the oil as it flows out of said outlet means.