Abstract
A hydraulic shedding device was developed to give heald frames a soft shedding motion at a higher speed. Two sets of double-acting piston cylinder and two directional control valves were used per one heald frame. The one of these two piston cylinders is reciprocated by linking with the main motion of the loom and this reciprocating motion is transmitted to the other piston cylinder through an oil motion under the cotrol of the directional control valve with three poitions. This valve is controlled by a pneumatic patten selecting device which transduces, the fabric pattern into the air signal, and the piston of the later cylinder operates according to the pattern . Being connected with a heald frame by a rope, the piston gives a shedding motion to the frame.
This sehdding device .is an open shed type and a kind of the positive dobby.
Experimental results have shown that this shedding device can be operated at more than 400 rpm.
