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    • 4. 发明公开
    • Automatic needle thread supply control system
    • 自动针头供电控制系统
    • EP0265267A3
    • 1989-08-23
    • EP87309359.5
    • 1987-10-22
    • BROTHER KOGYO KABUSHIKI KAISHA
    • Sasaki, ToshioOgawa, Masao
    • D05B47/04D05B51/00
    • D05B51/00
    • An automatic needle thread supply control system having a pair of clamping members (152A) disposed between the needle thread supply source and the needle thread take-up member (138), for clamping and releasing the needle thread (114). The moment when the clamping members start moving apart from each other and the period in which the clamping members are held apart from each other are controlled by control means according to the thickness of the work fabric or the thickness of the needle thread. While the clamping members are separated from each other, the needle thread is supplied from the needle thread supply source without restraint as the work fabric is fed. The needle thread is thus supplied under a tension conforming to the type of the work fabric in tight­ening the needle thread. During the free supply of the needle thread, the thread take-up member is held at the uppermost position, and hence the needle thread of an amount corresponding to the needle thread demand of the shuttle is supplied properly. After the supply of the needle thread has been accomplished, the clamping members are engaged to clamp the needle thread to prevent the excessive supply of the needle thread, while the thread take-up member starts its motion in phase with the vertical reciprocatory motion of the needle. To control the motion of the clamping mem­bers according to the thickness of the needle thread instead of the thickness of the work fabric, the control means is provided with proportional control means for engaging and for disengaging the clamping members at a speed proportional to the rotating speed of the arm shaft (128) of the sewing ma­chine,
    • 6. 发明公开
    • Thread feed mechanism in sewing machine
    • FadenzufuhrvrichrichtungfürNähmaschine。
    • EP0179928A1
    • 1986-05-07
    • EP84111646.0
    • 1984-09-28
    • JUKI CORPORATION
    • Sakuma, KuniharuGoto, Sumio
    • D05B47/00
    • D05B51/00
    • @ A thread feed mechanism in a sewing machine for paying-out thread in a predetermined amount necessary for forming one seam. The thread feed mechanism comprises a first signal generation device for producing feed amount and needle bar amplitude signals, a second signal generation device for producing a workpiece thickness signal, first means for adding square values of feed amount and amplitude signals, second means for multiplying a square root of the first means by a coefficient, third means for producing a signal varying depending upon the operation mode thereof, fourth means for multiplying an workpiece thickness signal by the output of the third means, and fifth means for adding the outputs of the second, third and fourth means.
    • 缝纫机中的线进给机构,用于以预定量形成一个接缝所需的出线螺纹。 线进给机构包括用于产生进给量和针杆振幅信号的第一信号产生装置,用于产生工件厚度信号的第二信号产生装置,用于添加进给量和振幅信号的平方值的第一装置,用于将 第一装置的平方根乘以系数,第三装置,用于产生根据其操作模式而变化的信号;第四装置,用于将工件厚度信号乘以第三装置的输出;以及第五装置,用于将第二装置的输出相加 ,第三和第四手段。