MODIFICATION AND EVALUATION OF SEEDLING PICKING AND RELEASING MECHANISM OF ANNAPURNA RICE TRANSPLANTER
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Authors
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MRINMOY BISWAS*, E.V. THOMAS and UTTAM KUMAR
Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur-721302
Abstract
The Laboratory model seedling picking and releasing mechanism has been developed by modifying the
mechanism of “Annapurna Rice Transplanter”during 2012-13. Opening of finger is controlled by gap provided
between two T-shaped cam plates. Finger assembly has two arms, shorter arm is attached to the fixed L-angle bar
and longer arm was hinged to the fixed shaft. Both arms are connected by a spring. Spring is used to close the finger
after picking the seedling from the seedling tray. Two channels mounted on the frame are also provided for the
smooth movement of finger assembly. One channel has straight path through which finger assembly can be raised
or lowered for holding the cluster of seedlings and another is curved path through which finger assembly can be
lowered for releasing of seedling. Two roller sets were used to guide the movement of cam during the picking and
planting operations. The Laboratory model manual rice transplanter was tested for its picking and releasing operation
of seedlings in the laboratory conditions. Opening width of fingers increased linearly with the depth of handle from
its reference level allowing smooth operation of opening and closing of fingers while picking and releasing of a
cluster of seedlings.
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