| 摘要 |
A punching tool for use in a tablet making machine includes a body portion having at least one bore extending from an end of the holder a preselected distance into the holder. The bore is internally threaded a preselected depth. An interchangeable punch is threaded into the punch holder bore and extends a selected length from the holder. The end of the punch has an externally threaded portion and a cylindrical portion. The cylindrical portion is positioned between the threaded portion and the portion of the punch that extends outwardly from the holder. The cylindrical portion has a diameter that permits it to move freely without interference into and out of the internally threaded bore. The bore has an enlarged thread configuration provided with cylindrical bearing surfaces between threads. The punch threaded portion has a thread configuration corresponding to the configuration of the threaded bore to permit rapid engagement and disengagement of the punch in the bore. The bearing surfaces of the bore stabilize the punch in the bore to maintain the required length of the punch extending from the holder.
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