公开(公告)号：US06213039B1

公开(公告)日：2001-04-10

申请号：US09604653

申请日：2000-06-27

申请人： Toshio Kawahito ,  Hiroyuki Iuchi ,  Tatsuaki Kaneda

发明人： Toshio Kawahito ,  Hiroyuki Iuchi ,  Tatsuaki Kaneda

IPC分类号： D05B6936

CPC分类号： D05B51/00 ,  D05B57/02 ,  D05B69/36

摘要： An apparatus for detecting thread breakage in a sewing machine. The sewing machine comprises a looper reciprocating laterally across a leading end of a needle, a thread-controlling cam fixed on a rotary shaft interlocked with the reciprocal motion of the looper and varying in the extent of projection from the thread take-up stand along with rotation of the shaft, and thread guides disposed on the thread take-up stand at both sides of the thread-controlling cam. Said thread guides have thread eyelets for inserting the looper thread. Other thread guides having thread pass eyelets for inserting the looper thread are fixed and disposed on the looper thread route between the thread-controlling cam and the looper. A thread breakage-detecting member detects presence or absence of vibration of looper thread inserted in the thread pass eyelets of other thread guides between the other thread guides. A control circuit stops the sewing machine from driving on the basis of the detection of absence of thread vibration by this thread breakage-detecting member. In this constitution, breakage of looper thread while the sewing machine is being driven is securely detected, and the sewing machine is stopped immediately when the looper thread is broken, so that lowering of the sewing operation efficiency is effectively prevented.

摘要翻译： 一种用于检测缝纫机中断线的装置。 该缝纫机包括横穿穿过针头的前端的弯针，一个固定在旋转轴上的螺纹控制凸轮，与旋环的往复运动互锁，并且与卷取架的突出程度不同， 轴的旋转，以及设置在线卷取架上的线引导件在线控凸轮的两侧。 所述螺纹导向件具有用于插入弯针线的螺纹孔眼。 具有用于插入弯针线的螺纹孔眼的其它螺纹导向器固定并设置在线控制凸轮和弯针之间的弯针线路上。 线断线检测构件检测插入在其它导线器之间的其它导线器的螺纹孔眼中的弯针线的振动的存在或不存在。 基于该断线检测部件检测到不存在螺纹振动，控制电路使缝纫机停止行驶。 在该结构中，可以可靠地检测缝纫机被驱动时的弯针线的破损，并且当弯针线断裂时缝纫机立即停止，从而有效地防止缝纫操作效率的降低。

公开(公告)号：US06336417B1

公开(公告)日：2002-01-08

申请号：US09922781

申请日：2001-08-07

申请人： Toshio Kawahito ,  Masahito Saito

发明人： Toshio Kawahito ,  Masahito Saito

IPC分类号： D05B6936

CPC分类号： D05B69/36

摘要： An apparatus according to the present invention comprises a sensor and a control circuit. The sensor is disposed near a needle drop portion of a needle plate and detects the quantity of light transmitted through cloths passing over the needle plate. The control circuit determines defective sewing from increase and decrease of said light quantity. The control circuit comprises means for storing the averaged value of the light transmitted in a few stitches of initial sewing operation, and means for determining defective sewing continuously from the initial sewing operation by comparing the average value with the value of the light transmitted and detected each time. Thus, it is possible to immediately start the practical sewing operation without taking time for test sewing or other extra jobs even when every cloth to be sewn is different in properties.

摘要翻译： 根据本发明的装置包括传感器和控制电路。 传感器设置在针板的针下降部附近，并且检测穿过针板的布料透射的光量。 控制电路根据所述光量的增减来确定缝制不良。 控制电路包括用于存储在初始缝合操作的几针中传输的光的平均值的装置，以及用于通过将平均值与传播和检测到的每个的光的值进行比较来确定从初始缝合操作连续地确定缺陷缝合的装置 时间。 因此，即使要缝制的布料的特性不同，也可以立即开始实际的缝制操作，而无需花费时间进行缝制或其他额外的工作。