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    • 1. 发明授权
    • Press apparatus and press system
    • 印刷机和印刷机系统
    • US6053027A
    • 2000-04-25
    • US117241
    • 1998-09-01
    • Yasuo Yoshizawa
    • Yasuo Yoshizawa
    • B21D19/08B21D37/04B30B1/06B30B1/26B30B15/02B30B15/28B21J7/46
    • B30B15/028B30B1/06
    • A support frame (14) is provided above a base (10), defining a working space (16) together with the support frame. An automatic die-replacing mechanism (24) is provided in the working space, for moving a selected one of a plurality of die units (78) to a predetermined working position. A support base table is provided with an elevating axle (18) for opening and closing the die unit located at the working position, and a drive mechanism section for moving the elevating axle up and down. The drive mechanism section has a pulse servomotor (38) and an oscillating-fulcrum mechanism (22) for transmitting a drive force to the elevating axle. The oscillating arm (46) of the oscillating-fulcrum mechanism has a fulcrum section supported by the support table, a power-point section supported by a shaft which is rotated by the pulse servomotor, and an application-point section coupled to the elevating axle.
    • PCT No.PCT / JP97 / 04308 Sec。 371日期:1998年9月1日 102(e)1998年9月1日PCT 1997年11月26日PCT公布。 第WO98 / 23438号公报 日期1998年6月4日在基座(10)的上方设有支撑框架(14),与支撑框架一起限定工作空间(16)。 在工作空间内设置有自动模具更换机构24,用于将多个模具单元78中选定的一个移动到预定的工作位置。 支撑基台设置有用于打开和关闭位于工作位置的模具单元的升降轴(18)和用于上下移动升降轴的驱动机构部分。 驱动机构部分具有用于将驱动力传递到升降轴的脉冲伺服电机(38)和摆动支点机构(22)。 摆动支架机构的摆动臂(46)具有由支撑台支承的支点部分,由轴支撑的动力点部分,该轴由脉冲伺服马达旋转;以及应用点部分,其与升降轴 。
    • 9. 发明授权
    • Transformer-coupled amplifier
    • 变压器耦合放大器
    • US5838196A
    • 1998-11-17
    • US847769
    • 1997-04-23
    • Yasuo Yoshizawa
    • Yasuo Yoshizawa
    • H03F1/42H03F1/56H03F3/22H03F3/28H03F3/30
    • H03F3/22H03F1/565H03F3/28
    • A transformer-coupled amplifier includes a driver transformer in which a primary winding, a secondary winding, and a tertiary winding are wound on a core of a magnetic circuit, a drive signal source for supplying an AC drive signal superposed with a drive-stage DC current to the primary winding of the driver transformer, a power tube for extracting, from the secondary winding of the driver transformer, an AC signal corresponding to the AC drive signal supplied to the primary winding of the driver transformer, and for amplifying the AC signal from the secondary winding, and a DC magnetization control power source for supplying a predetermined magnetization control current to the tertiary winding of the driver transformer so as to change a degree of DC magnetization of the core of the magnetic circuit of the driver transformer. The DC magnetized state of the core of the transformer magnetized by the DC current is appropriately changed by the magnetization control current.
    • 变压器耦合放大器包括驱动变压器,其中初级绕组,次级绕组和第三绕组缠绕在磁路的磁芯上,驱动信号源用于提供与驱动级DC重叠的AC驱动信号 电流到驱动变压器的初级绕组,用于从驱动变压器的次级绕组提取与提供给驱动变压器的初级绕组的交流驱动信号相对应的AC信号的功率管,并且用于放大AC信号 以及用于向驱动变压器的三次绕组提供预定的磁化控制电流以改变驱动变压器的磁路的磁芯的直流磁化程度的直流磁化控制电源。 通过DC电流磁化的变压器的磁芯的直流磁化状态由磁化控制电流适当地改变。