Epson WF-4830/4820 Series Ink System

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Mechanical Configuration for Epson WF-4830/4820 series

  • The ink system mechanism of this product employs the direct acting type*1 and consists of the carriage lock mechanism, wiper mechanism, capping mechanism, pump mechanism, and venting valve (valve mechanism).

There are two types of the capping: direct acting type and sliding type. In the direct acting type, the cap moves up and down independently of the carriage and caps the printhead. In the sliding type, the printhead is capped (the cap is moved up) when the carriage pushes the cap slider.

Epson-WF-4830-4820-series-Inksystem-mechanism-model

  • All the mechanisms are driven by the IS Motor. The drive force of the IS Motor is transmitted to each mechanism via transmission parts, such as the Pump drive combination gear, clutch gear, intermittent gear, cam, and drive lever.
  • Additionally, the WF-4830/WF-4820 Series utilize a maintenance box (waste ink pad) that retains waste ink from the cap, with which users can replace ink themselves.

Epson-WF-4830-4820-series-Inksystem-mechanism

Cleaning Epson WF-4830/4820 series

  • Clogging of nozzles on the printhead occurs due to air bubbles generated inside the ink path of the printhead, or an increase in ink viscosity caused by drying of ink.
  • To prevent the clogging or clean the clogged nozzles, various types of cleaning (CL) are performed at different times as described below:
  • Printhead Cleanings:
    • Initial ink charge:
      • Purpose: To fill the head with ink
      • Explanation: Performed after the printer is powered at the first time.
    • Ink cartridge replacement CL:
      • Purpose: To eject air bubbles entrapped inside the printhead during the cartridge replacement
      • Explanation: Performed automatically after the cartridge replacement is finished.
    • Timer cleaning:
      • Purpose:
        • To eject bigger air bubbles inside the printhead
        • To save ink, the time between the timer cleanings is becoming longer on the most newer printers. This is achieved by adopting the plastic that have the function to suppress the growth of air bubbles inside the printhead and by improving in shape of the ink supply nozzles
      • Explanation: Performed according to the printing time and time elapsed since the last cleaning.
    • Regular cap suction:
      • Purpose: To prevent ink leakage from the cap
      • Explanation: Sucks out ink pooling inside the cap due to head flushing operations or the like.
    • Flushing:
      • Purpose: To prevent ink inside nonused nozzles from increasing its viscosity
      • Explanation: The printhead is controlled to fire ink droplets from the nozzles periodically.

— Epson WF 4830/4820 series Paper feed, paper loading mechanism, click here

Epson WF-4830/4820 series Controlling Waste Ink

  • Ink used by cleanings (waste ink) is absorbed by the waste ink pad. If the absorbed amount exceeds the limit of the waste ink pad, leakage of the waste ink can occur. To prevent this, the printer firmware has a counter to counts the waste ink amount taking evaporation into account, The count value is retained in the maintenance box CSIC and in the EEPROM.

Epson-WF-4830-4820-series-waste-ink-pad-position

  • Another waste ink produced by borderless printing is absorbed by absorbers attached on the front paper guide. For the borderless printing, the printer makes an image slightly expand all the way to the edge of the paper, therefore, the image edge portions not printed on paper must be absorbed. Some printers also have the counter for this waste ink amount.
  • If each counter reaches its limit, a maintenance error occurs and replacement of the maintenance box or the waste ink pad, as well as counter reset will be required.

— Post on removing Epson XP 15000 | XP series Inksystem Assy, click here

Epson WF-4830/4820 series Gear drive flow

  • The ink system mechanism is driven by the IS motor. The relationship between the IS motor rotational direction and operation of each part is as follows.

Epson-WF-4830-4820-series-Inksystem-drive-path

  • On above picture with each part of Epson WF 4830/4820 Series gear drive:
    • A || Combination gear A
    • B || Combination gear B (with IS encoder scale)
    • C Spur gear
    • D Pump drive combination gear
    • E Combination gear C
    • F Clutch
    • G Intermittent gear
    • H Intermittent gear 2
    • I Wiper/cap-drive cam
    • J Wiper gear 1
    • K Wiper gear 2
    • L Wiper gear 3

Epson-WF-4830-4820-series-Inksystem-drive-path-flow-diagram

  • The clutch, intermittent gear 1, intermittent gear 2, and wiper/cap-drive cam move linked to the rotation of combination gear C, but if the wiper moves to the wiping position, the intermittent gear 2 teeth surface separate, and the combination gear C drive is disengaged.
    At these times, the wiper, cap, valve, and CR lock lever will not operate even if the IS motor is rotating.
    If the IS motor rotates in the opposite direction, then the intermittent gear 2 and combination gear C will again mesh, operating each part.
  • This prevents mechanisms except the pump mechanism from driving while the IS motor rotates continuously to drive the pump mechanism.

— About Epson XP 15000 | XP series, click here

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