Detection Functions with Sensors

2.5.1 Sensors for covers

0023-2554

iPF750 / iPF755

F-2-38 Upper cover lock switch

The microswitch-based upper cover lock switch detects the open/closed states of the upper cover.

When the upper cover close, the switch is pressed to detect the closed state of the upper cover.

Ink tank cover switch (L)/(R)

The microswitch-based ink tank cover switches detect the open/closed states of left and right ink tank cover.

When an ink tank cover closes, the switch is pressed to detect the closed state of the ink tank cover.

Ink Tank Cover Switch (L)

Ink Tank Cover Switch (R)

Upper Cover Lock Solenoid

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2.5.2 Ink passage system

0023-2556

iPF750 / iPF755

F-2-39 Head Management Sensor Pump Encoder Sensor

Ink Detection Sensor (L)/(R) Ink Passage Valve Open/Closed Detection Sensor (L)/(R)

Ink Supply Valve Open/Closed Detection Sensor (L)/(R)

Shutter HP Sensor Pump Cam Sensor

Pump cam sensor

The photo-interrupter-type pump cam sensor detects that the sensor light is shielded or unshielded by the rotary cam. The sensor detects the purge unit capping and wiping states with the combination of the state detected by the pump cam and the state of pump motor rotation control performed by the pump encoder.

F-2-40 Pump encoder sensor

The pump encoder is a photo-interruptive type sensor. It reads the slits on the pump motor's encoder film to control the amount of pump motor rotation.

F-2-41 Ink supply valve open/closed detection sensor (L)/(R)

The photo-interrupter-type ink supply valve open/closed detection sensor detect the valve cam state.

When the link that operates in conjunction with the ink supply valve cam shields light, this sensor detects that the ink supply valve has been opened.

Ink passage valve open/closed detection sensor (L)/(R)

The photo-interrupter-type ink passage valve open/closed detection sensor detect the valve cam state.

When the link that operates in conjunction with the ink passage valve cam shields light, this sensor detects that the ink passage valve has been opened.

Ink detection sensor (L)/(R)

Presence of absence of ink in the ink tank is detected according to whether the two hollow needles are electrically connected.

When the ink level in the ink tank lowers below the wall around the hollow needle at the air passage, this hollow needle is electrically disconnected form the hollow needle located on the ink supply side, thus detecting that the printer has run out of ink.

- Carriage lock - Capping

- Suction

- Air passage valve open - Idle suction

- Printing

- Suction during printing

- Wiping - Carriage lock

- Air passage

- Carriage move - Idle ejection

- Idle suction Rotary flag Sensor

Sensor Slits

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Head management sensor

The photo-transmission-type sensor detects that the printhead is discharging ink.

The carriage moves to and stops at the detection positions for individual nozzle arrays. When the carriage is at a stop, nozzles discharge ink on after another.

The sensor detects each nozzle due to the voltage change caused when ink discharged from the nozzle blocks the sensor light.

Non-discharging nozzle detection is carried out at the following timings:

- After the execution of Cleaning 1, Cleaning 2, Cleaning 3, Cleaning 6 or Cleaning 10

- After the number of copies that has been set by the user menu choice Nozzle Check Frequency have been printed

If more than a specified number of non-discharging nozzles have been located in one session of non-discharging nozzle detection, the normal cleaning sequence is launched before a second session of non-discharging nozzle detection is conducted. If more than a specified number of non-discharging nozzles are located in the second session of non-discharging nozzle detection, the normal (High) cleaning session is launched before a third session of non-discharging nozzle detection is conducted.

If there are at least 320 non-discharging nozzles out of 2560 nozzles as the result of non-discharging nozzle detection, printing is canceled after displaying a message to replace the head.

However, if service mode: [SERVICE MODE] > [SETTING] > [HEAD DOT INF] is [ON], the following message appears.

If there are at least 30 nozzles unable to correct the non-discharging state and the number of non-discharging nozzles is less than 100 out of 2,560 nozzles as the result of non-discharging nozzle detection, printing can continue after displaying a message to check the printing. Also, if the number of non-discharging nozzles is at least 100 but less than 320 nozzles, printing can continue after displaying a message to check the head. And if there are at least 320 non-discharging nozzles, printing is canceled after displaying a message to replace the head.

F-2-43 Printhead Nozzle unit

Head management sensor unit

2.5.3 Carriage system

0023-2559

iPF750 / iPF755

F-2-44 Carriage HP sensor

The photointerrupter-based carriage HP sensor detects the home position of the carriage.

Installed on the right side plate of the printer, the sensor detects an edge of the carriage home position on the carriage unit under carriage unit under carriage move-ment control.

The printer establishes the carriage home position from the position at which its edge is detected as a reference position.

Linear encoder sensor

Mounted on the back of the carriage, the linear encoder detects the position of the carriage from a slit in the linear scale during its movement.

Lift cam sensor

A photointerrupter-based sensor. After the sensor light is shielded by the flag, the lift motor is driven by a predetermined number of pulses to regulate the separation between the printheads and platen automatically.

Ambient temperature sensor

The thermostat-based ambient temperature sensor mounted on the carriage PCB detects the ambient temperature to which the carriage is exposed.

The resistance of the thermistor that varies as a function of temperature changes in the printer is transmitted to the main controller via the carriage PCB.

The ambient temperature is used to help calibrate the head temperature sensor and detect abnormal ambient temperatures.

Lift Cam Sensor Carriage HP Sensor Multi Sensor

Linear Encoder Sensor

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