The snapshots of body transferring experiment are shown in
Fig. 15. According to the process of body transferring, the nursing
bed begins to move its belts to the left direction first, as
shown in Fig. 15(a). The belts of the nursing bed reach the designated
position and stop at the 18th second. Then, the main bed
starts to transfer the body at the 60th second. When the body is
transferred for about 250 mm, the body is on the bedplates of
the nursing bed at the 70th second, as shown in Fig. 15(b). At
this time, the belt system of the nursing bed begins to act and
transfer the body. At 70–90 s, because the loading of the main
bed decreases, the velocity of belt system also decreases to keep
the same transferred distance for the body. The belt system of
the main bed stops at about 430 mm. The belt system of the
nursing bed keeps transferring the body to the middle position
of the nursing bed, as shown in Fig. 15(c). The belt system of
the nursing bed stops at the 100th second. Finally, the body is
transferred from the main bed to the nursing bed. If the bedridden
people need to be transferred back to the main bed, they
only need to execute similar processes with reverse direction.
In order to transfer the body from the main bed to the nursing
bed safely, the transferring function needs the synchronization
of two sets of the ac servo motors and the cooperation of the two
bed motions.