US 2003/0116043 A1Published application

Pump for inking or like purposes

AssigneeKabushiki Kaisha Tokyo Kikai Seisakusho

InventorsYoshinori Uera, Keita Matsuzaka

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Abstract

An inking pump for an offset printing press has a cylinder defining a bore in which a plunger is received for both rotation and linear reciprocation, creating a first and a second opposed fluid chamber. The cylinder has formed therein a first and a second suction port with a spacing therebetween axially of the bore, and, angularly spaced 180 degrees from the suction ports, a first and a second discharge port with an axial spacing therebetween. The plunger has formed in its surface a first recess for placing the first fluid chamber in successive communication with the first suction port and the first discharge port during each complete revolution of the plunger, and a second recess for placing the second fluid chamber in successive communication with the second suction port and the second discharge port during each complete revolution of the plunger. The first and second recesses are angularly spaced 180 degrees from each other about the plunger axis, so that the ink is delivered twice during each complete revolution, with concurrent one complete linear reciprocation, of the plunger.

Claims6

Dependent claims

A pump suitable for use in an inking mechanism of a printing press, among other applications, comprising:

(a) housing means defining a bore having an axis;
(b) a first and a second suction port formed in the housing means with a spacing therebetween axially of the bore, and a first and a second discharge port formed in the housing means with a spacing therebetween axially of the bore, there being a preassigned angular spacing about the axis of the bore between the first and second suction ports and the first and second discharge ports, all of the first and second suction ports and the first and second discharge ports being open to the bore;
(c) a plunger slidably and liquid-tightly fitted in the bore for both rotation and linear reciprocation relative to the housing means, the plunger defining a first and a second opposed fluid chamber in the bore;
(d) a first recess formed in the plunger adjacent a first end thereof and in a first preassigned angular position thereon for placing the first fluid chamber in successive communication with the first suction port and the first discharge port during each complete revolution of the plunger;
(e) a second recess formed in the plunger adjacent a second end thereof and in a second preassigned angular position thereon for placing the second fluid chamber in successive communication with the second suction port and the second discharge port during each complete revolution of the plunger;
(f) whereby, by driving the plunger so as to make one complete linear reciprocation during each complete revolution, the fluid is drawn into the pump twice, and discharged therefrom twice, during each such cycle of pump operation.

3 more elements

Dependencies are inferred from the claim text.