Non-sticking pump for use in recovery of ink jet recording appar

Details Non-sticking pump for use in recovery of ink jet recording appar Non-sticking pump for use in recovery of ink jet recording appar

1994-12-16

1998-03-03

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

B41J 2175

Patent

active

057240809

ABSTRACT:
A pump is arranged to prevent adhesion between pump members caused by an increase in the viscosity of ink in the pump during a standby state of the pump. The pump has a cylinder, a piston which forms an internal space in the cylinder by being closely fitted in the cylinder and which causes a change in pressure in the internal space to expel ink through the ejection outlet of the ink jet head, and a seal member provided between a shaft of the piston and the cylinder so as to closely contact the shaft and the cylinder. The piston and the cylinder are released from a state of closely contacting each other when the piston is in a standby position. In another embodiment the shaft of the piston and the seal member are released from a state of closely contacting each other when the piston is in a standby position.

REFERENCES:
patent: 3892166 (1975-07-01), Johansson
patent: 4053901 (1977-10-01), Skafvenstedt et al.
patent: 4138687 (1979-02-01), Cha et al.
patent: 4379303 (1983-04-01), Nakagaki et al.
patent: 5357275 (1994-10-01), Ikado et al.
patent: 5468128 (1995-11-01), Benalikhodja
patent: 5485187 (1996-01-01), Okamura et al.
JIS-B-0601, "Definitions and Designation of Surface Roughness," 1982, pp. 616-619.

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