立毛脱穀型収穫機に関する2, 3の基礎的考察

抄録

Previously we devised the new threshing method and studied on this method using an experimental model. In this paper we report the results of stationary experiments of stripping device (Fig. 1) employed by our method and the comparison among various layouts of stripping device.
1) Each type of the layout of stripping device is divided into two groups; the one is with stripping reel set at right angles to traveling direction and the other, parallel, In the case of the former which is low in traveling velocity, a wider operating width must be taken to increase the rate of work. In the case of the later which is narrow in operating width, a higher traveling velocity must be taken to increase the rate of work.
2) The practical ranges of revolutional speeds of stripping reel and traveling velocities were defined by the quality of stripping. In the former type, the rotating pitch of stripping tooth must be taken for less than 45mm, lest grain should be unstrapped. In the later type, the peripheral speed of stripping tooth must be taken for 400-470cm/sec where the upper limit was given by the number of branch-breaking and the lower limit was given by the number of unstipped grains.
3) The required power of the reel shaft of the later type was less than 0.1 hp per one row under most conditions.
4) Further studies are needed to decrease the number of branch-breaking and to attach the feeding device of rice plant to stripping reel.