Gripper holder bands driving mechanism for shuttleless looms

Machine element or mechanism – Mechanical movements – Rotary to alternating rotary

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139449, F16H 2140

Patent

active

040709183

ABSTRACT:
A shuttleless loom including a pair of lance bands operative to insert weft threads through a shed of warp threads is constructed with a driving crankshaft which operates to synchronously drive both the lance bands and the reciprocating sley of the loom. A sector gear is mounted upon the sley for reciprocal pivotal movement whereby the lance bands are driven through a gear train meshing with the sector gear. The sector gear is driven through a connecting rod mounted eccentrically upon a drive wheel which is driven by the crankshaft. Because of the eccentric mounting of the connecting rod upon the crankshaft, the reciprocating pivotal motion of the sector gear imparts increased acceleration to the lance bands midway through their travel and a decreased acceleration at the ends of the lance band stroke. Furthermore, inasmuch as the sector gear is pivotally mounted upon the sley, reciprocal movement of the sley will cause a certain degree of sector gear rotation thereby imparting some degree of movement to the lance bands.

REFERENCES:
patent: 3192958 (1965-07-01), Birmans et al.
patent: 3678968 (1972-07-01), Juillard

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