Let-off warp beam coupling device

In a let-off warp beam coupling device having a let-off warp beam rotatably and detachably mounted on a specified position of a weaving machine and a beam gear provided on the weaving machine so as to be opposite to a shaft end of a beam shaft of the let-off warp beam for rotating the let-off warp beam, the coupling device coupling the beam shaft and the beam gear,

• the improvement comprising:
• a driven coupling member secured at the shaft end of the beam shaft of the let-off warp beam, and having a plurality of projections provided on a circle positioned on a plane perpendicular to an axial direction of the beam shaft, each of the projections projecting in the axial direction of the beam shaft and having a side face tapered in the axial direction;
• a driving coupling member provided on the beam gear side so as to be opposite to the driven coupling member with a specified spacing between the driving and driven coupling members, and the driving coupling member having a plurality of projections provided on a circle positioned on a plane perpendicular to the axial direction of the beam shaft, each of the projections of the driving coupling member projecting in the axial direction of the beam shaft toward the driven coupling member and having a side face tapered in the axial direction,
• the projections of the driven and driving coupling members being formed so that adjacent projections of one of the driven coupling member and the driving coupling member fit between the opposite projections of the other coupling member without leaving any space therebetween;
• and
• means for holding an interengagement state in which the adjacent projections of one of the driven coupling member and the driving coupling member are fitted between the opposite projections of the other coupling member without leaving any space between the fitted projections.