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    Liquid circulation apparatus and liquid discharge apparatus
    1.
    发明授权
    Liquid circulation apparatus and liquid discharge apparatus 有权

    公开(公告)号：US10226939B2

    公开(公告)日：2019-03-12

    申请号：US15875578

    申请日：2018-01-19

    申请人： Hiroshi Sawase ,  Takahiro Yoshida

    发明人： Hiroshi Sawase ,  Takahiro Yoshida

    IPC分类号： B41J2/18 ,  B41J2/175 ,  B41J2/14 ,  B41J2/045

    摘要： A liquid circulation apparatus includes a circulation channel through which a liquid is circulated via a liquid discharge head including a supply port and a discharge port. The circulation channel includes a first manifold communicating with the supply port of the liquid discharge head, a second manifold communicating with the discharge port of the liquid discharge head, a supply channel connecting the first manifold and the supply port of the liquid discharge head, and a discharge channel connecting the second manifold and the discharge port of the liquid discharge head. A fluid resistance from the first manifold to the supply port of the liquid discharge head via the supply channel is smaller than a fluid resistance from the second manifold to the discharge port of the liquid discharge head via the discharge channel.

    Image forming apparatus
    7.
    发明授权
    Image forming apparatus 有权
    图像形成装置

    公开(公告)号：US09486999B2

    公开(公告)日：2016-11-08

    申请号：US14934427

    申请日：2015-11-06

    申请人： Yuta Moriwaki ,  Hiroshi Sawase

    发明人： Yuta Moriwaki ,  Hiroshi Sawase

    IPC分类号： B41J2/045 ,  B41J2/165

    CPC分类号： B41J2/04586 ,  B41J2/0454 ,  B41J2/16508 ,  B41J2/1652 ,  B41J2/16523 ,  B41J2002/16573

    摘要： An image forming apparatus includes a liquid discharge head, a temperature detector, a memory, and a controller. The temperature detector detects a temperature of the liquid discharge head. The memory stores the temperature of the liquid discharge head detected with the temperature detector. The controller controls a bubble purge operation to purge bubbles in the liquid discharge head. When a current temperature of the liquid discharge head acquired by the temperature detector is higher than a stored temperature stored in the memory and a deviation of the acquired current temperature and the stored temperature is equal to or more than a predefined threshold value, the controller executes control to execute the bubble purge operation, and when the current temperature acquired by the temperature detector is lower than the stored temperature, the controller executes control to update the stored temperature stored and retained in the memory with the acquired current temperature.

    摘要翻译： 图像形成装置包括液体排出头，温度检测器，存储器和控制器。 温度检测器检测液体排出头的温度。 存储器存储用温度检测器检测的液体排出头的温度。 控制器控制气泡吹扫操作以清除液体排出头中的气泡。 当由温度检测器获取的液体排出头的当前温度高于存储在存储器中的存储温度，并且获取的当前温度和存储的温度的偏差等于或大于预定阈值时，控制器执行 控制以执行气泡清除操作，并且当由温度检测器获取的当前温度低于存储温度时，控制器执行控制以用所获取的当前温度更新存储和保存在存储器中的存储温度。

    Image forming apparatus including recording head
    8.
    发明授权
    Image forming apparatus including recording head 有权
    图像形成装置，包括记录头

    公开(公告)号：US08845057B2

    公开(公告)日：2014-09-30

    申请号：US13557678

    申请日：2012-07-25

    申请人： Hiroshi Sawase

    发明人： Hiroshi Sawase

    IPC分类号： B41J29/38 ,  B41J2/165 ,  B41J3/60

    CPC分类号： B41J3/60 ,  B41J2/16526 ,  B41J2/16579

    摘要： An image forming apparatus includes a plurality of nozzles to discharge liquid droplets; a recording head including a pressure generator to generate a pressure to cause the nozzles to discharge liquid droplets; a droplet discharge status sensor unit to detect a droplet discharging status from each nozzle; and a maintenance controller to control a maintenance operation by a dummy discharge of liquid droplets not contributing to image formation. In such an image forming apparatus, the droplet discharge status sensor unit compares a detection result of the droplet discharge status and a preset reference threshold and determines whether the nozzle discharges normally or defectively; and the maintenance controller outputs a dummy discharge drive waveform corresponding to a difference between the detected droplet discharge status and the reference threshold to the pressure generator of the nozzle determined to be defective to cause the nozzle to discharge droplets for dummy discharging.

    摘要翻译： 图像形成装置包括用于排出液滴的多个喷嘴; 记录头，包括压力发生器，以产生使喷嘴排出液滴的压力; 液滴喷射状态传感器单元，用于检测来自每个喷嘴的液滴喷射状态; 以及维护控制器，通过对图像形成无贡献的液滴的虚拟排出来控制维护操作。 在这种图像形成装置中，液滴喷出状态传感器单元将液滴喷射状态的检测结果与预先设定的基准阈值进行比较，并判定喷嘴是否正常排出或者是有缺陷; 并且维护控制器将与检测到的液滴喷射状态和参考阈值之间的差相对应的虚拟排出驱动波形输出到被确定为有缺陷的喷嘴的压力发生器，以使喷嘴排出用于虚拟放电的液滴。

    Liquid discharge apparatus
    10.
    发明授权
    Liquid discharge apparatus 有权

    公开(公告)号：US10259246B2

    公开(公告)日：2019-04-16

    申请号：US15730890

    申请日：2017-10-12

    申请人： Hiroshi Sawase

    发明人： Hiroshi Sawase

    IPC分类号： B41J2/14 ,  B41J2/18 ,  B41J2/19 ,  B41J29/38 ,  B41J2/175

    摘要： A liquid discharge apparatus includes a circulation channel in which liquid circulates, a liquid discharge head disposed on the circulation channel to discharge the liquid, a bypass channel to connect an upstream portion and a downstream portion of the liquid discharge head, a switch to switch the circulation channel between a first route in which the bypass channel is a part of the circulation channel and a second route in which the bypass channel is not a part of the circulation channel, a pressure generator to generate pressure to circulate the liquid in the circulation channel, a degassing device to degas the liquid in the circulation channel, and control circuitry to perform a degassing operation to degas the liquid by circulating the liquid in the circulation channel.