公开(公告)号：US4232258A

公开(公告)日：1980-11-04

申请号：US888404

申请日：1978-03-20

Applicant: Nobuyoshi Matsumura

Inventor： Nobuyoshi Matsumura

IPC: H02P7/292 ,  H02P7/24

CPC classification number: H02P7/293 ,  Y10S388/902 ,  Y10S388/919

Abstract: A direct current obtained by rectifying an alternating current voltage by means of a diode bridge circuit is applied to a direct current motor connected to the diode bridge circuit. Use is made of the fact that the voltage developed across the diode bridge circuit varies, depending on the magnitude of the induced voltage across the motor. To that end, the interjunction of a capacitor series circuit coupled to the bridge circuit is connected through a voltage responsive bidirectional switching device, such as a diac, to a control electrode of a voltage controlled bidirectional switching device, such as a triac, for phase control of the alternating current voltage. One electrode of the voltage responsive bidirectional switching device is coupled to a variable resistor provided in a gang fashion with a controller, such as a foot controller pedal, so that the voltage obtainable from the variable resistor is superposed on the voltage in the switching device, such as a diac. In operation, therefore, if and when the induced voltage across the motor decreases, an electric charge in the capacitor is discharged to be supplied to one electrode of the diac, thereby to control the voltage controlled bidirectional switching device, such that the conduction phase is increased and thus, the speed of the motor is increased. Preferably, the above described capacitor is provided with a series connected discharging resistor.

Abstract translation: 通过二极管桥式电路对交流电压进行整流而获得的直流电流被施加到连接到二极管桥式电路的直流电动机。 使用二极管桥式电路所产生的电压根据电机两端感应电压的大小而变化的事实。 为此，耦合到桥式电路的电容器串联电路的互连通过电压响应双向开关器件（例如二极管）连接到诸如三端双向可控硅开关之类的电压控制双向开关器件的控制电极，用于相位 控制交流电压。 电压响应双向开关装置的一个电极与一个控制器（例如脚踏控制器踏板）耦合到以组合方式设置的可变电阻器，使得可从可变电阻器获得的电压叠加在开关装置中的电压上， 例如diac。 因此，在操作中，如果并且当电动机两端的感应电压降低时，电容器中的电荷被放电以提供给双向双绞线的一个电极，从而控制压控双向开关器件，使得导通相位为 因此增加了马达的速度。 优选地，上述电容器设置有串联连接的放电电阻器。

公开(公告)号：US4416206A

公开(公告)日：1983-11-22

申请号：US271572

申请日：1981-06-08

Applicant: Nobuyoshi Matsumura

Inventor： Nobuyoshi Matsumura

IPC: D05B3/06 ,  D05B3/24

CPC classification number: D05B3/24

Abstract: A detection circuit senses whether a buttonhole type presser foot is attached to a sewing machine presser bar and through a control circuit enables or disables pattern selection switches for machine operation other than a buttonholing mode.

Abstract translation: 检测电路检测扣眼式压脚是否安装在缝纫机按压杆上，并且通过控制电路启用或禁用除了扣眼模式之外的机器操作的图案选择开关。

公开(公告)号：US4139808A

公开(公告)日：1979-02-13

申请号：US831869

申请日：1977-09-09

Applicant: Nobuyoshi Matsumura

Inventor： Nobuyoshi Matsumura

IPC: D05B69/22 ,  H02P7/292 ,  H02P3/10

CPC classification number: D05B69/22 ,  H02P7/293 ,  Y10S388/917

Abstract: A sewing machine driven by a motor which is adapted to be energized by an alternate current power supply and is phase controlled by means of thyristors. In a normal operating mode the conduction phase of the thyristors is made variable as a function of the extent of the depression of a foot controlled pedal, whereas in a low constant speed mode the thyristors are made conductive at a predetermined phase. The motor is coupled to a main shaft which is provided with a magnet located at a predetermined position, while a bracket arm is provided with a reed switch located at a predetermined position, such that if and when the foot controlled pedal is released, the reed switch is actuated to trigger the thyristors for reverse braking of the motor as a function of the counter electromotive force of the motor. Preferably, a timer is provided for interrupting the power supply after the lapse of a predetermined time period after the foot controlled pedal is released.

Abstract translation: 由电动机驱动的缝纫机，其适于由交流电源供电并通过晶闸管相位控制。 在正常操作模式中，晶闸管的导通相位根据脚踏控制踏板的压下程度而变化，而在低恒定速度模式下，晶闸管以预定的相位导通。 电动机联接到主轴，该主轴设置有位于预定位置的磁体，而支架臂设置有位于预定位置的簧片开关，使得如果脚踏控制踏板被释放，则当簧片被释放时，簧片 开关被致动以触发晶闸管，用于电动机的反向制动作为电动机的反电动势的函数。 优选地，提供定时器，用于在脚踏踏板释放之后经过预定时间段之后中断电源。