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    • 124. 发明授权
    • Digital data processing system
    • 数字数据处理系统
    • US06226325B1
    • 2001-05-01
    • US08801588
    • 1997-02-18
    • Shinichi Nakamura
    • Shinichi Nakamura
    • H04B166
    • G11B20/00007H03M7/3053H04B1/667
    • Data obtained by dividing digital data into a low-frequency signal and a high-frequency signal and converting the low-frequency signal and a signal obtained by subjecting the high-frequency signal to a lossless compression coding process into a transmission format is transmitted. The lossless compression coding process is effected by dividing a digital data string input in the unit of sample constructed by a preset number of bits into block units constructed by a plurality of samples, removing a constant number of bits having a common value from each sample starting from the sign bit side thereof for all of the samples in each block to form a compressed block and attaching information indicating the number of removed bits to the compressed block.
    • 发送通过将数字数据分割成低频信号和高频信号并将低频信号和将高频信号进行无损压缩编码处理而获得的信号转换为传输格式的数据。 无损压缩编码处理通过将由预设位数构成的采样单元中输入的数字数据串划分成由多个采样构成的块单元来实现,从每个采样开始移除具有公共值的常数数量的位 从其每个块中的所有样本的符号位侧起形成压缩块,并将指示被去除的位数的附加信息附加到压缩块。
    • 129. 发明授权
    • Gun drill
    • 枪钻
    • US5443585A
    • 1995-08-22
    • US266706
    • 1994-06-28
    • Haruo KawaseKatsunori MatsumotoShinichi Nakamura
    • Haruo KawaseKatsunori MatsumotoShinichi Nakamura
    • B23B51/06B23B51/04B23B51/00
    • B23B51/04B23B2251/424Y10S408/705Y10T408/89Y10T408/899Y10T408/905Y10T408/9095
    • A cutting edge 18 is provided on the end of a cutter tip 12 on a gun drill body 1. The cutting edge 18 has: a radially inner region providing a convex curved cutting edge portion 23, a radially outer region providing a straight cutting edge portion 19 and an intermediate region which provides a concave cutting edge portion 22 having a tapered portion 20 and a concave portion 21. The convex curved cutting edge portion 23, when viewed in the direction of the axis O, presents an arc shape, the radius R of the curvature of which is determined in relation to the outside diameter D of the gun drill so as to range from 0.1.times.D to 0.4.times.D. Thus, a gun drill is provided which exhibits an enhanced severing effect to cut metal chips into pieces so as to prevent clogging, as well as to prevent an increase in the cutting resistance, thus meeting the demand for a greater feed rate.
    • 切割刃18设置在枪钻头主体1上的刀尖12的端部上。切削刃18具有:径向内部区域,其设置凸曲面切削刃部分23,径向外部区域,其提供直线切削刃部分 提供具有锥形部分20和凹部21的凹形切割边缘部分22的中间区域。当从轴线O的方向观察时,凸曲面切割边缘部分23呈弧形,半径R 其曲率相对于枪钻的外径D确定为0.1×D至0.4×D。 因此,提供了一种炮钻,其具有增强的切割效果,将金属碎片切割成片,以防止堵塞,并且防止切割阻力的增加,从而满足更大进给速度的需求。