HP Color 9850mfp Service Manual - Page 366

II UNIT EXPLANATION FOLDING/THREE-FOLDING (Q5687A ONLY) 5.2.2 Folding conveyance control Q5686A/Q5687A The folding roller is driven by the folding conveyance motor (M720). The three-folding roller rotates by following the folding roller. A. Folding conveyance control A specified period of time after the folding passage sensor (PS726) detects paper and the booklet stopper stops at the folding position, the folding knife motor (M719) turns on. When M719 turns on, the folding knife HP sensor (PS722) turns on and the folding conveyance motor (M720) also turns on to fold the first folding by the folding roller, and for three-folding, fold the second folding by the three-folding roller, to be discharged to the booklet tray. A specified period of time after the folding exit sensor (PS725) detects the trailing edge of paper bundle, M720 stops. [5] Folding passage sensor (PS726) Stopper motor (M718) UP DOWN Folding knife HP sensor (PS722) Folding knife motor (M719) Folding conveyance motor 80mm/s (M720) 400mm/s Folding exit sensor (PS725) [1] [2] [3] [4] [1] Size shift of the booklet stopper [2] Pushing of paper into the folding roller by the folding knife [3] Folding pressure [4] Paper conveyance [5] Folding knife evacuation position B. Booklet full detection Booklet tray full detection is made by a pair of translucent sensors of the folding full LED (LED 729) and the folding full sensor (PS729). If the light is shielded by the paper discharged for more than a specified period of time, this is regarded as a full detection. 2-36