Liquid supply device and liquid ejecting apparatus

Abstract

The invention provides a liquid supply device and liquid ejection apparatus, with the capability of securing a relatively high bubble discharge ability at the time of the choke cleaning of the liquid ejecting head, even in a configuration in which the feeding pump type liquid supply section is provided. Enough liquid is supplied to the liquid ejecting head when performing a suction drive of the pump. A printer (11) comprises a liquid supplying device (21), wherein the liquid supplying device (21) comprises a pump (23), an unidirectional valve (44) for suction on upstream side of the pump (23), an unidirectional valve (45) for ejection on downsream side of the pump (23), wherein the liquid supplying device (21) is connected with a recording head unit (20) by a liquid supplying pipe (22). In the recording head unit (20), the middle of the liquid flow channel (30) communicated with a nozzle (29) is provided with a choke valve (31), a buffer chamber (32) and a self-seal valve (33) which are arranged in turn from the downstream side. The liquid volume obtained by the sum of the flow channel volume from the choke valve (31) to the nozzle (29) and the volume of a cover (26) is lower than the liquid amount driven by the pump form one time. In addition, the buffer chamber (32) comprises a liquid storage chamber partly blocked by the film and the film comprises the structure of non-spring force-application type which is not applied with force by the spring.

Description

technical field [0001] The present invention relates to a liquid supply device and a liquid ejection device. The liquid supply device is provided in the liquid ejection device. The liquid ejection device has: a liquid ejection head having an ejection port for ejecting liquid; The ejection port forcibly ejects liquid, and the liquid supply device has a liquid supply mechanism. downstream second check valve. Background technique [0002] Conventionally, in an inkjet printer which is a liquid ejecting device, characters, images, etc. are recorded by ejecting ink droplets as a liquid from a recording head toward a target (paper, etc.). In addition, such a printer is equipped with an ink cartridge (liquid container) as an ink supply source for supplying ink to a recording head. Known ink supply methods for supplying ink from an ink cartridge to a recording head include a method using a head difference based on the ink liquid level of the ink cartridge and the nozzle height of t...

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Problems solved by technology

[0017] In addition, the ink supply device disclosed in Patent Document 2 does not have a structure for performing slug cleaning, and therefore does not have a slug valve.

For example, in order to properly perform choke cleaning, it is necessary to arrange the choke valve at an appropriate position, but there is no disclosure on the disposition position of such a choke valve.

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