Control mechanism in dobbies for controlling the heald frames in a loom

Claim 1

CONTROL MECHANISM FOR A DOBBY FOR USE IN A LOOM FOR CONTROLLING SHEDDING COMPRISING, A DRIVEN SHAFT, A CONNECTING ROD EFFECTING SHEDDING, AN ECCENTRIC MOUNTED ON SAID SHAFT FOR ALTERNATE COUPLING TO SAID SHAFT AND UNCOUPLING THEREFROM FOR IMPARTING RECIPROCABLE MOTION TO SAID CONNECTING ROD, MEANS COMPRISING A YOKE OPERABLE BETWEEN TWO EXTREME POSITIONS, AND A SLIDABLE ELEMENT IN SAID ECCENTRIC TO SELECTIVELY ALLOW COUPLING OF THE ECCENTRIC TO SAID SHAFT AND UNCOUPLING THEREFROM DURING ROTATION OF SAID SHAFT, MEANS COMPRISING A PIVOTED ARM ENGAGEABLE WITH SAID YOKE SELECTIVELY TO MAKE IT MOVE TOWARD ONE OF SAID TWO EXTREME POSITIONS TO ALLOW SELECTIVE COUPLING AND UNCOUPLING OF SAID ECCENTRIC TO SAID DRIVEN SHAFT, MEANS CONSTANTLY BIASING SAID ARM IN A DIRECTION FOR ENGAGING SAID YOKE, EMANS OPERABLE IN ACCORDANCE WITH A GIVEN DESIRED PATTERN OF SHEDDING FOR RENDERING SAID PIVOTED ARM EFFECTIVE SELECTIVELY TO ACTUATE SAID YOKE TO SAID ONE EXTREME POSITION AND ALLOW SAID SLIDABLE ELEMENT TO ALLOW SELECTIVE COUPLING AND UNCOUPLING OF SAID ECCENTRIC TO SAID SHAFT, MEANS CONSTANTLY BIASING SAID YOKE IN A DIRECTION TOWARD THE OTHER EXTREME POSITION FOR ALLOWING SELECTIVE COUPLING AND UNCOUPLING OF SAID COUPLING ELEMENT TO SAID DRIVEN SHAFT, COUPLING MEANS IN SAID ECCENTRIC CONSTANTLY BIASED TO ENGAGE SAID SHAFT AND COUPLE SAID ECCENTRIC THERETO AND OPERABLE UNDER CONTROL OF SAID SLIDABLE ELEMENT TO A POSITION AWAY FROM SAID SHAFT AND UNCOUPLED FROM SAID SHAFT, A PIVOTED LEVER ACTUATED SELECTIVELY BY SAID YOKE AT SAID EXTREME POSITIONS TO RENDER SAID SLIDABLE ELEMENT EFFECTIVE TO OPERATE SAID COUPLING MEANS TO SAID POSITION AWAY FROM SAID SHAFT AND UNCOUPLED THEREFROM.