| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of preventing generation of a sink mark only by using resin pressure. SOLUTION: The sink mark-preventing device 10 has a first pin 11, a first elastic member 32, a second pin 16, a second elastic member 35, a clutch ball 20, and a tubular body 21 as fundamental components. The first elastic member urging the first pin is compressed by the first pin and the second pin, and sufficiently strong elastic energy is stored in the first elastic member. When the second pin 2 recedes at a predetermined distance, the clutch ball is detached and the first pin becomes free. When the resin solidifies and shrinks, the first pin is pushed out by the first elastic member to push the resin strongly. Consequently the sink mark can be sufficiently prevented. COPYRIGHT: (C)2009,JPO&INPIT
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