A first swing roller is arranged on a first swing arm; the first swing arm is arranged at the front upper part of a stand through a bearing with a seat;

其第一摆动辊装在第一摆动臂上，第一摆动臂通过带座轴承安装在机座的前上部分；

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A first swing roller is arranged on a first swing arm; the first swing arm is arranged at the front upper part of a stand through a bearing with a seat;

其第一摆动辊装在第一摆动臂上，第一摆动臂通过带座轴承安装在机座的前上部分；

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