| 摘要 |
A pump unit for a printing machine comprises a base member and a plurality of pumps incorporated in the base member. Each of the pumps comprises a cylinder mounted to the base member and provided with a main bore closed at one end thereof and extending in an axial direction of the cylinder member and with suction and discharge ports, a plunger fitted in the main bore of the cylinder so as to always close another end of the main bore and to be reciprocal and rotatable therein, a variable speed motor mounted to the base member having an output shaft, and a transmission mechanism disposed between the plunger and the variable speed motor for transmitting an output of the variable speed motor to the plunger member. The transmission mechanism comprises an arm member mounted to the output shaft of the variable speed member and a connection member coupled at one end to the plunger member and at another end to the arm member through a spherical bearing. The plunger is formed with a cutout to an insertion end of the plunger so that the suction and discharge ports are both closed together at two portions different by a half rotation in its rotational phase, and either one of the suction port and the discharge port is alternately communicated with the main bore through the cutout at another two portions except for said two portions in its rotation phase, and the connection member has a center axis intersecting the rotation center axis of the plunger and the rotation center axis of the output shaft so that the intersection angle of the center axis of the connection member with the rotation center axis of the plunger is always constant and the intersection angle of the center axis of the connection member with the rotation center axis of the output shaft is variable.
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