Pump unit including pump frame, pump wheel and pulley and method

Details Pump unit including pump frame, pump wheel and pulley and method Pump unit including pump frame, pump wheel and pulley and method

1996-05-23

1999-06-08

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 33, B41J 2165

Patent

active

059108088

ABSTRACT:
A pump unit and corresponding method for applying negative pressure to a capping device to prevent clogging of a nozzle opening in an ink jet printer includes a frame having a supporting surface on which a pump tube is disposed. A plurality of gears which are driven by a motor of the ink jet printer are disposed in the frame. A plurality of pulleys are rotatably mounted to one of the gears for applying a pressure to the pump tube to thereby generate a negative pressure in the pump tube. The maximum contact region between the pulleys and the tube in the pump frame is selected to be smaller than 180.degree. to allow for the load applied to the tube by the pulleys to be essentially constant. Damper sheets are economically disposed in the frame to position the pulleys to contact the tube when the gear on which the pulleys is driven in a certain direction. The tube is lead out of the frame in a manner so that at least one half of the tube is bent at right angles at a position where the tube separates from the tube supporting surface and is fixed in a slot formed in the pump frame. Accordingly, the frame space facing the tube supporting surface is used effectively, and the tube can be freely lead to a connection point external of the pump frame.

REFERENCES:
patent: 5309180 (1994-05-01), Uchida
patent: 5382969 (1995-01-01), Mochizuki et al.

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