| 摘要 |
PURPOSE:To provide a draft apparatus where serrated uneven parts are formed on the surfaces fitted with a top arm and retainer to be hooked, thus making roller interval change easy, also ensuring the rollers to be parallel. CONSTITUTION:When a top arm 4 is fitted with rollers 7-11 through a retainer 6, the both surfaces where said top arm 4 and retainer 6 come into contact are provided with uneven parts 4a and 6a, respectively, the top arm 4 is pro vided with a long hole 4b with penetration, and with a screw 12 put through this hole, the retainer 6 is fixed on the top arm 4. |
