Research on the development of harvester with the delimbing function of broad leaved tree

收割机是一种高效、低耗的伐木机械。但到目前为止，还没有制造出具有阔叶树划线功能的机器。因此，我们从1993财政年度开始继续研究，将阔叶树的划界功能添加到收割机上。第一年讨论了划界设备的结构。经检验，我们与刀具的改进相对应，在第一阶段制作了一些具有不同前斜角和逃逸角度的刀具。这些刀具的切割能力是与桦树种有关的。也就是说，讨论了刀具的耐久性和附着法及其形态。通过这些数据对刀具的应用进行了讨论。本研究认为，通过对刀具的改进，可以实现阔叶树的分界，特别是在林分密度高、树干笔直的桦树次生林中。

Harvester is a logging machine that have functions of the highly efficient and the meny process. But until the present, machines with the delimbing function of the broad leaved tree are not made. Therefore, we have ccontinued research that attaches a delimbing function of the broad leaved tree to harvestor, from the fiscal year 1993. The structure for delimbing equipment was discussed at the first year. As a result of examination, we corresponded with the improvement of Knife.Some Knives which had different front bevel angles and escape angles were made at the first stage. Delimbing ability of those knives were with Betula species. As the result, it was cleared that knives which formed 23 degree front bevel angle and 3 degree escape angle was proper.In the fiscal year 1994, the development of the parcical knives was aimed from former results. That is, endurance and attaching method of the knives with its forms was discussed. As the result, the two-storied and flexibility knives were adoped.7 types were estimated, the points of the estimation were as follows ; successfulness of cutting, length of residual branch, cutting strenghth. The application of the knives was discussed by those data. It was realized in the case of regular edge 23 degree was optirimal.In this study, it was concluded that the improvement of the knives would enable the delimbing of broad leaved tree, especially in the secondary forest of betula species which have high stand density and straight stems.