| Patent application number | Description | Published |
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| 20090102879 | INKJET RECORDING APPARATUS AND RECORDING METHOD - An inkjet recording apparatus has: a recording head of an inkjet type having a liquid ejection surface where a plurality of nozzles which eject liquid are arranged, a supply port which supplies the liquid to an internal flow channel connected to the plurality of nozzles, and an outlet port which is connected to the supply port via the internal flow channel and through which the liquid in the internal flow channel is expelled; a first liquid chamber which is connected to the supply port of the recording head via a first external flow channel; a second liquid chamber which is connected to the outlet port of the recording head via a second external flow channel; a liquid buffer chamber which stores the liquid supplied from a liquid supply source; a first connecting flow channel which connects the first liquid chamber to the liquid buffer chamber; a second connecting flow channel which connects the second liquid chamber to the liquid buffer chamber; a first pressure determination device which determines an internal pressure of the first liquid chamber; a second pressure determination device which determines an internal pressure of the second liquid chamber; a liquid movement device which moves the liquid between the first liquid chamber, the second liquid chamber and the liquid buffer chamber; and a pressure control device which controls the liquid movement device in accordance with determination results of the first pressure determination device and the second pressure determination device in such a manner that interiors of the first liquid chamber and the second liquid chamber respectively assume prescribed pressures, wherein the pressure control device controls the liquid movement device so as to adjust the internal pressures of the first liquid chamber and the second liquid chamber in such a manner that a prescribed pressure differential between the internal pressures of the first liquid chamber and the second liquid chamber is produced and a prescribed back pressure is applied to the liquid inside the plurality of nozzles of the recording head. | 04-23-2009 |
| 20100073437 | INKJET RECORDING APPARATUS - An inkjet recording apparatus includes: a recording head including an introduction section, a discharge section and nozzles; a first liquid chamber connected to the introduction section; a second liquid chamber connected to the discharge section; a first buffer tank which is connected to the first liquid chamber and an interior of which is open to air; a second buffer tank which is connected to the second liquid chamber and an interior of which is open to air; and a pressure control device which sets target pressures of the first liquid chamber and the second liquid chamber in such a manner that a prescribed back pressure is applied to the liquid inside the nozzles of the recording head while a prescribed pressure differential is provided between the first liquid chamber and the second liquid chamber, and controls driving of the first pump and the second pump in accordance with determination results of the pressure determination device in such a manner that the internal pressures of the first liquid chamber and the second liquid chamber remain constant at the target pressures, wherein the first buffer tank and the second buffer tank are connected via a flow channel, and at least one of a filter and a deaeration device is provided in the flow channel. | 03-25-2010 |
| 20110080456 | INKJET RECORDING APPARATUS - The inkjet recording apparatus includes: a supply manifold having an inlet port to which a first main flow channel is connected, the liquid supplied from a tank through the first main flow channel being stored in the supply manifold, the supply manifold being connected to supply ports of head modules; a collection manifold having an outlet port to which a second main flow channel is connected, the liquid to be collected to the tank through the second main flow channel being stored in the collection manifold, the collection manifold being connected to discharge ports of the head modules; and a first bypass flow channel which connects the supply manifold to the collection manifold, wherein an end of the first bypass flow channel is connected to an upper side of an end of the supply manifold on a side opposite to a side where the inlet port is arranged. | 04-07-2011 |
| Patent application number | Description | Published |
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| 20100079511 | LIQUID DROPLET EJECTING DEVICE - The present invention provides a liquid droplet ejecting device including a liquid droplet ejecting head; a liquid storage unit that stores a liquid; a first flow path and a second flow path that connect the liquid droplet ejecting head and the liquid storage unit, the second flow path connecting with the first flow path in the liquid droplet ejecting head; a bypass flow path connected with the first flow path and the second flow path; a liquid feed unit provided between the liquid storage unit and a connecting portion of the bypass flow path and the first flow path, and circulating the liquid in the liquid droplet ejecting head and the liquid storage unit, and a pressure control unit provided at the bypass flow path, and controlling pressure of the liquid flowing through the bypass flow path from the first flow path side to the second flow path side. | 04-01-2010 |
| 20100188453 | DROPLET EJECTING APPARATUS - A droplet ejection apparatus includes droplet ejection units each including a supply port and an ejection port, a common supply flow path, a common discharge flow path, supply flow paths that connect the supply port to the common supply flow path, openable mechanisms provided at the supply flow paths, discharge flow paths that connect the ejection port to the common discharge flow path, one-way valves provided at the discharge flow paths, a pressure applying unit, and a controller. When performing a maintenance operation of a selected droplet ejection unit, the controller applies a pressure with the pressure applying unit so that the pressure in the plural discharge flow paths at the common discharge flow path side with respect to the respective one-way valves is higher than the other side, and opens only the openable mechanism corresponding to the selected droplet ejection unit. | 07-29-2010 |
| 20100188454 | DROPLET EJECTION APPARATUS - A droplet ejection apparatus includes a common flow path; droplet ejection units each respectively including a first distribution port; first flow paths that respectively connect each first distribution port to the common flow path; first open/close mechanisms provided respectively at the first flow paths; a first pressurizing unit that applies a positive pressure to the common flow path; a second open/close mechanisms provided at the common flow path at the first pressurizing unit side of connection portions that connect the common flow path and the respective first flow paths; and a controller. When the second open/close mechanism is closed, the controller opens only one or more first open/close mechanisms corresponding to one or more target droplet ejection units, applies positive pressure to a section of the common flow path at the first pressurizing unit side of the second open/close mechanism, and then opens the second open/close mechanism. | 07-29-2010 |
| 20110074892 | LIQUID DROPLET EJECTING APPARATUS - A liquid droplet ejecting apparatus including: plural liquid droplet ejecting portions; supply-side individual flow paths; discharge-side individual flow paths; a supply-side common flow path; a discharge-side common flow path; first opening/closing mechanisms; second opening/closing mechanisms; a first pressure applying portion; a second pressure applying portion; a first circulating path; a third opening/closing mechanism; a second circulating path including an upstream end portion being connected to the supply-side common flow path further downstream than a connecting portion of a supply-side individual flow path connected to the supply-side common flow path at a furthest upstream side in a liquid circulating direction and a downstream end portion being connected to the discharge-side common flow path, and circulating the liquid between the supply-side common flow path and the discharge-side common flow path; and a fourth opening/closing mechanism, is provided. | 03-31-2011 |
