| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet drilling apparatus which solves a problem in which excess height causes increase in the size of the apparatus and which uses a cam plate having a cam groove to reduce the size. SOLUTION: Two cam plates 10 and 20 are slidably provided in a parallel relation. The first cam plate 10 has cam grooves 11 to 14. These cam grooves are engaged with projection engagement sections 30A to 33A, respectively, thereby providing four punches 30 to 33. Two center punches 31 and 32 among these punches additionally have projection engagement sections 31B and 32B, respectively, thereby allowing these projection engagement sections to be engaged with cam grooves 21 and 22 provided at the second cam plate 20, respectively. Then, the four punches 30 to 33 are arranged in parallel along the two cam plates. One of these cam plates is selected and is slid to use the above-described cam grooves to selectively operate some of the four punches.
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