Ink supplier for ink jet recorder

Abstract

In order to maintain ink supply pressure to a recording head constant while supplying the recording head with ink with an minimum of air entrained therein, the invention provides an ink supplier which comprises a main ink reservoir, a subsidiary ink reservoir connected to the main ink reservoir for replenishment with ink from the main ink reservoir and a means whereby a position head of the ink liquid level in the subsidiary ink reservoir is maintained substantially constant relative to a printing head face of the recording head. Included preferably also are a deaerator associated with the subsidiary ink reservoir for removing air from ink therein and a float floating on ink in the subsidiary ink reservoir. Further, in order for a mechanism that adjusts the position head for ink supply to the recording head to be made light equipped and manufactured at reduced cost, the invention provides an ink supplier that comprises a back pressure reservoir connected between the main ink reservoir and the recording head and adapted to maintain a height of the ink liquid level therein substantially constant against an amount of ink consumption by the recording head and a means for adjusting the back pressure reservoir in its vertical position, thereby adjusting a position head of the ink liquid level in the back pressure reservoir relative to a printing head face of the recording head.

Description

technical field [0001] The present invention relates to an ink supply device for supplying ink to a recording head of an inkjet recording device capable of continuous printing. Background technique [0002] In the process of supplying ink to the recording head of the inkjet recording apparatus, the supply ink pressure acting on the recording head should be constant, and air bubbles should not be mixed in the ink. However, such an existing ink supply device, for example, as described in Japanese Patent Laid-Open No. 6-106731, uses a sub-tank in addition to a main tank for storing ink, and supplies ink for recording from the sub-tank. When the amount of ink in the sub-tank is below a certain value, ink is replenished by the main tank. In such an ink supply device, ink is supplied from the sub tank to the recording head by the ink supply pump, and an exhaust device is provided on the sub tank so that the liquid level of the ink in the sub tank communicates with the atmosphere ...

AI Technical Summary

Problems solved by technology

For this reason, in the above-mentioned prior art, the driving source and the driving structure for raising and lowering the main box are large-scale mechanisms, and there are problems in terms of installation space and manufacturing cost.

[0008] In addition, due to the increase in the size of the ink tank, the response of the liquid level control caused by the raising and lowering of the ink tank is not sensitive.

Furthermore, the software control of the position and water head of the ink liquid surface through the measurement of the ink supply pressure also makes the control device complicated and has problems in cost.

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