Back to results
US 4,381,722 AGranted
Sewing machine
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsToshikatu Takeuchi, Kihei Goto, Yasuro Ichihashi, Takenori Kawase
Life of this patent
Estimating the term…
Abstract
In a sewing machine having a presser foot and a pressure imparting member for applying a downward pressure to the presser foot, there is disposed, in an inner chamber of a frame, an oil pump drivingly connected to a main shaft. The oil pump having an inlet port for drawing the oil from an oil reservoir and an outlet port for deliverying the oil under the pressure corresponding to the speed of the main shaft. Also a presser actuating device is provided between the oil pump and the presser foot and designed to apply an additional downward pressure to the presser foot by means of the oil from the outlet port so as to increase the downward pressure of the presser foot.
Claims11
A sewing machine comprising;
- a frame defining an inner chamber therein and having a work supporting surface thereon,
- a presser foot for downwardly depressing a work on said work supporting surface,
- pressure imparting means for applying a downward pressure to said pressure foot,
- a main shaft rotatably supported on said frame,
- an oil reservoir disposed adjacent to said inner chamber,
- an oil pump disposed in said inner chamber and drivingly connected with said main shaft, said oil pump including an inlet port drawing the oil from said oil reservoir and an outlet port delivering the oil under the pressure corresponding to the speed of said main shaft, and
- presser actuating means provided between said oil pump and said presser foot, said presser actuating means applying an additional downward pressure to said presser foot by means of the oil from said outlet port so as to increase the downward pressure of said presser foot.
4 more elements
A sewing machine comprising;
- a frame defining an inner chamber therein and having a work supporting surface thereon,
- a presser foot for downwardly depressing a work on said work supporting surface,
- resilient pressure imparting means for applying a downward pressure to said presser foot,
- a main shaft rotatably supported on said frame,
- an oil reservoir disposed adjacent to said inner chamber,
- an oil pump disposed in said inner chamber and drivingly connected with said main shaft, said oil pump including an inlet port drawing the oil from said oil reservoir and an outlet port delivering the oil under the pressure corresponding to the speed of said main shaft, and
- presser actuating means provided between said oil pump and said resilient pressure imparting means, said presser actuating means applying an additional downward pressure to said presser foot through said resilient pressure imparting means by means of the oil from said outlet port so as to increase the downward pressure of said presser foot.
4 more elements
A sewing machine comprising;
- a frame defining an inner chamber therein and having a work supporting surface thereon,
- a presser foot for downwardly depressing a work on said work supporting surface,
- resilient pressure imparting means for applying a downward pressure to said presser foot,
- a main shaft rotatably supported on said frame,
- an oil reservoir disposed adjacent to said inner chamber,
- an oil pump disposed in said inner chamber and drivingly connected with said main shaft, said oil pump including an inlet port drawing the oil from said oil reservoir and an outlet port delivering the oil under the pressure corresponding to the speed of said main shaft,
- presser actuating means actuated by the oil from said outlet port of said oil pump, and
- resilient motion transmitting means interposed between said presser actuating means and said presser foot, said resilient motion transmitting means applying an additional downward pressure to said presser foot regardless of said resilient pressure imparting means upon the actuation of said presser actuating means so as to increase the downward pressure of said presser foot.
5 more elements
A sewing machine comprising;
- a frame defining an inner chamber therein and having a work supporting surface thereon,
- a presser foot for downwardly depressing a work on said work supporting surface,
- pressure imparting means for applying a downward pressure to said presser foot,
- a main shaft rotatably supported on said frame,
- an oil reservoir disposed adjacent to said inner chamber,
- an oil pump disposed in said inner chamber and drivingly connected with said main shaft, said oil pump including an inlet port drawing the oil from said oil reservoir and an outlet port delivering the oil under the pressure corresponding to the speed of said main shaft,
- presser actuating means provided between said oil pump and said presser foot, said presser actuating means applying an additional downward pressure to said presser foot by means of the oil from said outlet port so as to increase the downward pressure of said presser foot, and
- control means for varying the increasing rate of said additional downward pressure relative to the speed of said main shaft.
5 more elements
A sewing machine comprising;
- a frame defining an inner chamber therein and having a work supporting surface thereon,
- a presser foot for downwardly depressing a work on said work supporting surface,
- pressure imparting means for applying a downward pressure to said presser foot,
- a main shaft rotatably supported on said frame,
- an oil reservoir disposed adjacent to said inner chamber,
- a drive gear secured on said main shaft,
- a driven gear coupled with said drive gear and rotated around an axis upon the rotation of said drive gear,
- a first oil pump disposed in said inner chamber and having a pump shaft to which said driven gear is secured, said first oil pump including an inlet port drawing the oil from said oil reservoir and an outlet port delivering the oil to the moving parts of said sewing machine,
- a second oil pump disposed in said inner chamber and having a pump shaft to which said driven gear is also secured, said second oil pump including an inlet port drawing the oil from said oil reservoir and an outlet port delivering the oil under the pressure corresponding to the speed of said main shaft, and
- presser actuating means provided between said second oil pump and said presser foot, said presser actuating means applying an additional downward pressure to said presser foot by means of the oil from the outlet port of said second oil pump so as to increase the downward pressure of said presser foot.
7 more elements
A sewing machine comprising;
- a frame defining an inner chamber therein and having a work supporting surface thereon,
- a presser foot for downwardly depressing a work on said work supporting surface,
- pressure imparting means for applying a downward pressure to said presser foot,
- a main shaft rotatably supported on said frame,
- an oil reservoir disposed adjacent to said inner chamber, and
- an oil pump disposed in said inner chamber and secured on said frame,
- said oil pump including
- (a) a pump casing secured on said frame and having a pump chamber therein,
- (b) a pump shaft rotatably supported on said pump casing and drivingly connected with said main shaft,
- (c) an inlet port drawing the oil from said oil reservoir into said pump chamber,
- (d) an outlet port delivering the oil from said pump chamber under the pressure corresponding to the speed of said main shaft,
- (e) a cylindrical chamber provided within said pump casing and coupling with said outlet port, and
- (f) a piston movably mounted within said cylindrical chamber for applying an additional downward pressure to said presser foot by means of the oil from said outlet port so as to increase the downward pressure of said presser foot.
10 more elements
Dependencies are inferred from the claim text.