Dynamic host configuration protocol for IPv6
Dynamic host configuration protocol for IPv6
复制标题
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
R. Droms;J. Bound;B. Volz;Ted Lemon;C. Perkins;M. Carney
中科院分区：
文献类型：
--
作者：
R. Droms;J. Bound;B. Volz;Ted Lemon;C. Perkins;M. Carney
一种顶部送料装置，用于使上层材料与下层材料同步地前进。上送布装置包括上送布牙，该上送布牙与下送布牙一起周期性地运动，以便沿与缝纫机的一根或多根缝合针的行程相关的路径沿着夹持和推进被缝制的材料。上送布器的驱动力来自安装在缝纫机主驱动轴上的偏心凸轮，运动通过一个从上送布牙臂上垂下的杠杆臂强制地传递到该臂上，该杠杆臂是一个在可调压力下保持与偏心凸轮接触的凸轮随动表面。用于上送布牙臂的枢轴设置在主下送布杆的延伸部上，从而为上送布牙臂和下送布牙臂两者提供水平运动。
A top feeding device for advancing the upper layer of material in synchronism with the lower layer of material being sewn. The top feeding device includes an upper feed dog moving periodically in conjunction with a lower feed dog to grip and advance the materials being sewn along a path related to the stroke of the stitching needle or needles of the sewing machine. Drive for the top feeder is derived from an eccentric cam mounted on the sewing machine main drive shaft, motion being positively transferred to a pivotal upper feed dog arm by means of a lever arm depending from that arm and being a cam-following surface held under adjustable pressure in contact with the eccentric cam. The pivot for the upper feed dog arm is disposed upon an extension of the main lower feed bar which thereby provides horizontal motion to both the upper and lower feed dog arms.