one of the important components of the vegetable
transplanter is the seedling extraction mechanism,
which extracts the plug seedling from the pro – tray
cell and transfers them to the transplanting device, which
places them into the soil. Yanmar Agricultural Equipment Co.
and Kubota Cooperation, leading agricultural machinery
manufacturers in Japan, have developed two of the most
common seedling pick – up devices for the vegetable
transplanters widely used in Korea and Japan. The Yanmar –
type moves the pick- up pins toward the lower part of the cell
surface and extracts the seedling from the cell while moving
along a path in an open, counter – clockwise loop. The Kubota
– type generates a crossed path when picking up seedlings by
using a more sophisticated mechanism comprising of a slider,
cam, and links. Although these two pick – up devices perform
well, their structural complexity have made them difficult to
use for various types of vegetable transplanters. In addition,
these pick – up devices are not economically feasible for
indigenously made vegetable transplanters because of their
high manufacturing costs (Choi et al., 2000).
The demand for mechanization of vegetable production
in India has increased every year, so attempts are being made
to develop an automatic transplanter for vegetables. Seedling
pick – up mechanisms that are simple, accurate and
economically feasible are to be developed for vegetable
transplanters in India. This study was one of these attempts.
The articles authored by Brewer (1994), Choi et al. (2001)
and Choi et al. (2002) were reviewed to develop a concept of
seedling ejection device that will satisfy our requirement. Not
much of literature is available in this context. The objective
of this study was to develop a seedling pick – up mechanism
for vegetable transplanters suitable to Indian conditions and
evaluate its work performance in a laboratory.