会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 52. 发明授权
    • Sewing machine speed control system having quick response characteristic
    • 缝纫机速度控制系统具有快速响应特性
    • US4377778A
    • 1983-03-22
    • US199705
    • 1980-10-23
    • Shigeo NekiNozomu ShinozakiTakashi Dohi
    • Shigeo NekiNozomu ShinozakiTakashi Dohi
    • D05B69/18H02P23/00H02P29/00H02P29/04H02P5/16
    • H02P29/0016H02P23/22
    • A digital speed control system for a sewing machine comprises a digital speed setting device which responds to manual depression of a foot pedal by generating a digital position signal. A variable frequency divider divides the frequency of speed related pulses so that its output frequency is an integral submultiple of the input frequency, which is variable as a function of the digital position signal. A period detector senses the interval between pulses that occur successively at the output of the frequency divider and generates binary data representing the sensed interval. The interval-representing data is translated into a second period data in an arithmetic unit according to a predetermined transfer function. The arithmetic unit provides correction of the most recently sensed pulse interval according to the direction and amount of the deviation of the most recent pulse interval with respect to the preceding pulse interval, whereby the second period data is accordingly modified by an amount proportional to the rate of sewing speed variation. A pulse generator translates the second period data into pulse for activating a magnetic clutch or a magnetic brake depending on a sign of the second period data to accelerate or decelerate the sewing machine.
    • 一种用于缝纫机的数字速度控制系统包括数字速度设定装置,其通过产生数字位置信号来响应于脚踏板的手动按压。 可变分频器分频速度相关脉冲的频率,使得其输出频率是输入频率的整数倍,其可以作为数字位置信号的函数而变化。 周期检测器检测在分频器的输出处连续发生的脉冲之间的间隔,并生成表示感测间隔的二进制数据。 根据预定的传递函数,间隔表示数据被转换成算术单元中的第二周期数据。 算术单元根据最近的脉冲间隔相对于先前的脉冲间隔的偏差的方向和量来提供最近感测的脉冲间隔的校正,由此相应地将第二周期数据修改与速率成比例的量 的缝纫速度变化。 脉冲发生器根据第二周期数据的符号将第二周期数据转换为用于激活磁性离合器或磁性制动器的脉冲,以加速或减速缝纫机。