HP M5025 Service Manual - Page 197
Stacking roller separation detection
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4. As the cam rotates, the stacking roller arm is pushed up, and the upper stacking roller is pulled up from the paper. Paper Figure 4-55 Stacking roller separation control process (1 of 2) 5. When the stacking rollers are engaged, the stacking roller arm is released by further cam rotation. This causes the stacking roller arm to lower. Then, the upper stacking roller touches the paper. NOTE The swing separation sensor detects the position of the stacking roller arm. Figure 4-56 Stacking roller separation control process (2 of 2) NOTE The stacking roller control is also performed when the power switch is turned ON and at the start of the paper feed operation. Stacking roller separation detection The staple stacker detects the position of the upper stacking roller for operating the stacking roller separation control. This detection is performed by the staple stacker driver that is monitoring the SWING SEPARATION (SWNG_SNS) signal from the swing separation sensor (SR2105). There is a sensor flag moving together with the separation cam. When the stacking rollers are separated, the flag interrupts the sensor (SR2105). This brings the staple stacker driver determines that the stacking rollers are separated. Conversely, when the rollers are engaged, the flag does not interrupt the SR2105. This brings the driver determines that the rollers are engaged. During the stacking roller separation detection, the staple stacker driver rotates the leading-end alignment separation motor (M2102) for a specified period of time. If the SWNG_SNS signal does not change, the driver determines failure of the leading-end alignment separation motor, stops the loads, and notifies the formatter. ENWW Stapler/stacker component 167
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