SEWING MACHINE HYDRAULIC DRIVE MECHANISM Russian patent published in 1997 - IPC

FIELD: sewing engineering. SUBSTANCE: hydraulic drive mechanism has hydraulic pump rotor rigidly connected with main shaft of sewing machine. Rotor outer part or inner part of chamber is provided with curvilinear surface of radius variable in accordance with predetermined terminal link speed changing law. Curvilinear surface defines working pressure cavity of variable section between chamber wall and rotor. One spring-biased blade for double-section chamber or two spring-biased blades for single-section chamber are mounted within guiding slot of chamber wall or rotor. Blades are movable to curvilinear surface to provide for overlapping of pressure cavity section. Rotor surface is provided with one or two overflow channels, which are communicated with feeding vessel through groove made in rotor body and corresponding to overflow channel. Antigravity channel of width less than that of blade is made on curvilinear surface of rotor or chamber. EFFECT: increased efficiency, simplified construction, reduced vibration and enhanced reliability in operation. 5 cl, 11 dwg