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US 4,715,303 AGranted
Lubricating device for sewing and embroidering machines
AssigneePfaff Industriemaschinen GmbH
InventorsEdgar Busch, Lothar Schilling, Klaus Ziegler
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AssigneePfaff Industriemaschinen GmbH
InventorsEdgar Busch, Lothar Schilling, Klaus Ziegler
Estimating the term…
A lubricating device for a revolving lock stitch shuttle of machines such as sewing and embroidering machines comprises a shuttle body which has a hub portion which surrounds its associated shuttle arbor and which lies adjacent a bearing mounting for the arbor. The hub portion is hollow and defines a lubricating oil chamber between it and the associated bearing and a gap between the shuttle hub portion and the associated bearing is bridged by a fixed ring member which is carried on a bracket which is secured to the bearing. The ring member has an opening therethrough providing an access for a nozzle tube for feeding oil from an external reservoir to the hub recess from when the oil is advanced by the centrifugal force of the rotation of the shuttle to the periphery of the shuttle.
A lubricating device for the track of a rotating lock stitch loop taker of a sewing and embroidering machine, comprising a loop taker body having a hub portion, a rotatable loop taker arbor secured to said loop taker at the hub portion, a bearing block for rotatively mounting said loop taker arbor, said hub portion having a recess which comprises an oil chamber at its end facing said bearing block said arbor passing directly through said oil chamber before reaching the point at which it is secured to said hub portion, a fixed ring surrounding said loop taker hub portion enclosing a space between said hub portion and said bearing block a nozzle tube extending through the opening of said ring protruding into the recess of said loop taker hub portion for directing lubricating oil through an opening of said ring to the recess of said hub portion, a pump connected to said nozzle tube so as to supply lubricating oil to said recess portion, and a channel in said hub portion connecting said recess to the periphery of said loop taker so that the rotation of said loop taker produces a centrifugal force acting on the oil in the recess of said hub portion, to direct the oil, through said channel, to the periphery of said loop taker.
A lubricating device for lubrication of a rotating lockstitch loop taker of a sewing and embroidering machine, comprising a loop taker body having a hub portion;
A lubricating device for the track of a rotating lock stitch loop taker of a sewing and embroidering machine, comprising a loop taker body having a hub portion, a rotatable loop taker arbor secured to said loop taker at the hub portion, a bearing block for rotatively mounting said loop taker arbor, said hub portion having a recess at its end facing said bearing block, a fixed ring surrounding said loop taker hub portion enclosing a space between said hub portion and said bearing block, a nozzle tube extending through the opening of said ring protruding into the recess of said loop taker hub portion for directing lubricating oil through an opening of said ring to the recess of said hub portion, a pump connected to said nozzle tube so as to supply lubricating oil to said recess portion, and a channel in said hub portion connecting said recess to the periphery of said loop taker so that the rotation of said loop taker producing a centrifugal force acting on the oil in the recess of said hub portion, to direct the oil, through said channel, to the periphery of said loop taker, said sewing machine having a counter which is actuated by motion of a sewing needle to generate a pulse during movement of the needle, means for driving said pump in accordance with the indication of said counter to actuate said pump to deliver lubricating oil through said nozzle tube in pulsed manner.
Dependencies are inferred from the claim text.