| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly reproducible jig capable of easily providing sap collective grooves manually. SOLUTION: This jig works as follows: a support member 5 stably supported on the three points comprising a 1st roller 6 traveling under engagement on a collective groove 2a already provided by a skilled person on a rubber tree trunk 3, a 2nd roller 7 traveling under engagement on a sap collective groove 2b newly formed on the trunk as the 1st roller 6 travels, and a 3rd roller traveling along the trunk surface, is held by hand, and allowed to travel around the trunk while subjecting both the 1st and 2nd rollers to press contact with the trunk along the already provided groove 2a, thereby the side under the groove 2a is cut with a blade 8 set up between the 1st roller 6 and the 2nd roller 7 so as to adapt to specified cutting requirements, thus providing a renewed face 2b of a sap collective groove.
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