Studies on the Pull Type Knotters of Binders
The Rice-sheaf tightness and the knot Security
1971 Volume 33 Issue 2 Pages 152-155
Details
1971 Volume 33 Issue 2 Pages 152-155
There are two types of knotting devices in binders now in general use: the ordinary type and the pull type. Concerning these knotting devices, the binding experiments have been conducted to find out the difference of the rice-sheaf tightness and the knot security between the ordinary type and the pull type. The rice-sheaf tightness was expressed by the ratio of circular length of a rope that winds around a rice-sheaf when drawn with 10kg tension load to circular length of binding twine, and the knot security expressed by length of knot.
The results are as follows
1) The rice-sheaf tightness increased with increases in sheaf-diameter and in brake load of twine.
2) The rice-sheaf of the pull type was usually tighter than that of the ordinary one for about 10 percent.
3) The knot of the pull type was much more securer than that of the ordinary one and there was few influence by kind and brake load of twine in the pull type, comparing to the ordinary one.
4) While strong tension twines were required for keeping the rice-sheaf tightness and the knot security in the ordinary type, they were not required in the pull type, and so thinner and cheaper twines can be used in the latter.
