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公开(公告)号：EP0701061B1
公开(公告)日：1999-04-28
申请号：EP95306103.3
申请日：1995-08-31
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公开(公告)号：EP0701061A1
公开(公告)日：1996-03-13
申请号：EP95306103.3
申请日：1995-08-31
摘要： A pump unit includes a suction pump and a driving mechanism for driving the suction pump. The suction pump has a pump body provided with a suction port and a discharge port which are axially spaced, and a first piston and a second piston slidably fitted in the pump body to form a suction chamber therebetween. In operation, the driving mechanism moves the first piston away from the second piston to expand the suction chamber so that a negative pressure prevails in the suction chamber and ink is suctioned through the suction port into the suction chamber; moves both the pistons at the same moving speed until the suction chamber is expanded to a predetermined extent, the suction port is closed by the second piston and the first piston opens the discharge port; moves the first piston in the reverse direction until the same comes into contact with the second piston to discharge the ink suctioned into the suction chamber through the discharge port; and moves both the pistons in the reverse direction to return the pistons to their initial position. The pump housing may be of a cylindrical shape or an annular shape. A suction pump in a modification may be provided with a plurality of pairs of pistons forming a plurality of suction chambers each provided with a suction port and a discharge port.
摘要翻译： 泵单元包括抽吸泵和用于驱动抽吸泵的驱动机构。 所述抽吸泵具有设置有轴向隔开的吸入口和排出口的泵体，以及可滑动地嵌合在所述泵体内的第一活塞和第二活塞，以在其间形成吸入室。 在操作中，驱动机构使第一活塞从第二活塞移开，使吸气室膨胀，从而在吸入室中产生负压，油墨通过吸入口吸入吸入室; 以相同的移动速度移动两个活塞直到吸入室膨胀到预定的程度，吸入口被第二活塞关闭，第一活塞打开排出口; 使第一活塞沿相反方向移动，直到第一活塞与第二活塞接触，以通过排出口排出吸入吸入室的油墨; 并使活塞沿相反方向移动，以将活塞返回到其初始位置。 泵壳体可以是圆柱形或环形形状。 变型中的抽吸泵可以设置有多个形成多个抽吸室的活塞对，每个抽吸室设有吸入口和排出口。
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