Paper Feed and Transport System Learn jam detection.

Jam Detection　

　

○Purpose: Learning the positions and conditions of jam detection

　

　

1. Outline

This machine detects jams with six sensors (10 sensors when 3-Way Unit-A1 is attached).

The jam types are, delay jam, retention jam, and power-on jam.

The table below lists the sensors with their target jams. Then the sensor locations are shown next.

　

No. Sensor Delay jam Retention jam Power-on jam 1 Cassette 1 retry sensor (PS10) yes yes yes 2 Cassette 2 retry sensor (PS11) yes yes yes 3 Resist sensor (PS9) yes yes yes 4 Fused paper ejection sensor (PS13) yes yes yes 5 Paper ejection sensor (PS14) yes yes yes 6 Duplex transport sensor (PS17) yes yes yes 7 Tray 2 paper ejection sensor (PS101) yes yes yes 8 Duplex entrance sensor (PS103) yes yes yes 9 Reversing sensor (PS104) yes yes yes 10 Tray 3 paper ejection sensor (PS105) yes yes yes

*The green characters indicate the sensors of 3-Way Unit-A1 (standard for the iR2270/2870-120V, iR3570/4570 model).

　

○Jam detection sensor arrangements

a. iR2270/2870-230V model

1] Cassette 1 retry sensor (PS10)

　

[2] Cassette 2 retry sensor (PS11)

　

[3] Resist sensor (PS9)

　

[4] Fused paper ejection sensor (PS13)

　

[5] Paper ejection sensor (PS14)

　

[6] Duplex transport sensor (PS17)

b. iR2270/2870-120V, iR3570/4570 model

1] Cassette 1 retry sensor (PS10) 　 [2] Cassette 2 retry sensor (PS11) 　 [3] Resist sensor (PS9) 　 [4] Fused paper ejection sensor (PS13) 　 [5] Paper ejection sensor (PS14) 　 [6] Duplex transport sensor (PS17) 　 [7] Tray 2 paper ejection sensor (PS101) 　 [8] Duplex entrance sensor (PS103) 　 [9] Reversing sensor (PS104) 　 [10] Tray 3 paper ejection sensor (PS105)

The configuration of this block is explained with controls and functions below.

　

　

2. Jam Details

a. Delay jam detection

1) Cassette paper feed section (Cassette 1, 2)

If the front end of printing paper does not reach the retry sensor within the prescribed time after the paper feed motor becomes ON, it is regarded as a cassette paper feed delay jam.

2) Other than the cassette paper feed section

If the front end of printing paper does not reach the delay sensor within the prescribed time after passing one sensor before (N-1), an  paper feed motor becomes ON, it is regarded as an N delay jam. 

b. Retention jam detection

If the rear end of printing paper does not reach the delay jam sensor (N) within the prescribed time after the front end passes the retention jam sensor (N), it is regarded as an N retention jam.

c. Power-on jam detection

This machine checks the amount of paper in the machine when the power is turned on or a door is opened and closed.

If the motors start with non-fused paper in the machine when the power is turned on or a door is opened and closed, the non-fused toner may smear the fusing film. When the power is turned on or a door is opened and closed, the machine is checked for remaining paper. If remaining paper is found, the main unit stops driving.

The jam detection sequence is as follows:

　

3. Action

If a delay or retention jam occurs, this machine stops driving at the upstream of the sensor but not at the downstream to eject the jammed paper before stop. (Immediate stop in case of a power-on jam)

If a delay jam is detected at the fused paper ejection sensor (PS13), this machine stops the fusing motor immediately to prevent the fused paper from being wound.

In case of a jam, the DC controller notifies the main controller of the jam page. When printing is restarted after jam recovery, the jam page is printed first.