Presser foot actuating device
AssigneeDurkopp Adler Aktiengesellschaft
InventorArthur Picker
Life of this patent
Estimating the term…
Abstract
An actuating device (54) for lifting the presser foot (53) of a sewing machine. A piston (14) having a piston rod (15) is supported on the bearing (13) which guides the presser foot support rod (18). The presser foot support rod (18) is biased against the sewing material by a spring (40). The piston (14) is surrounded by a cylinder (26). The piston (14) with the piston rod (15) and the cylinder (26) form a piston-cylinder drive for actuation by compressed air, to urge the piston rod (15) against the force of the spring (40) and thereby lift the presser foot (53) off of the sewing material. The actuating device (54) has two set screws (42, 45) which respectively control the spring force acting on the presser foot and the distance the presser foot is raised by the actuating device. Two embodiments are described.
Claims10
An actuating device for a presser foot of a sewing machine, the actuating device comprising:
- a presser foot rod for supporting the presser foot, the rod having a driver attached thereto, the rod having a longitudinal axis;
- the rod being adaptable for being mounted on a housing of the sewing machine for being displaceable in the direction of the longitudinal axis between two end positions;
- a support bearing which is adaptable for being mounted on the housing and supporting one end of a spring;
- another end of the spring being supported on the driver on the presser foot rod, the spring urging the rod toward a lower end position thereof by a spring force acting along the longitudinal axis;
- the actuating device comprising a piston-cylinder drive for receiving a pressure fluid, and in response thereto, applying an opposing force directed upward against the spring force, the opposing force being greater than the spring force and thereby being capable of urging the rod into an upper end position thereof;
- the piston-cylinder drive applying the opposing force against the driver attached to the presser foot rod;
- and
- the piston-cylinder drive having a bore hole and the presser foot rod extending through said bore hole.
Dependencies are inferred from the claim text.