HP Indigo WS6600 Splice Detection System Installation and Troubleshooting -- C - Page 28

System information

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3 System information An ultrasonic sensor is mounted in the press bridge, and synchronized with the press and web handling system (WHS) software. When a splice is detected, the system alerts the operator to either skip the splice and continue printing (Skip and Continue) or to skip the splice and stop printing (Skip and Stop). The splice detection sensor is essentially two sensors at a fixed distance of 40 mm between them. When the splice detector senses a splice, it sends a signal to the press WHS. The duration of the detection signal is a maximum of 600 µs. Based on the speed of the substrate and the distance between the splice detection sensor and the nip, the ITM disengages to a position that avoids the splice. If the customer had selected earlier to work in Skip and Stop mode, the splice is stopped on the rewinder table and an error message is displayed in the UI indicating a splice event. When a splice is detected by the sensor, printing stops (that is, there is no second transfer) and is resumed based on a WHS fixed factor and the repeat length of the job. Due to finishing needs, the avoidance area (that is, where no printing occurs) is an increment of the repeat length. There are two possible scenarios of where the splice is detected: Figure 3-1 Within a repeat length (frame) Figure 3-2 At the meeting point of two adjacent frames 26 Chapter 3 System information

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System information
3
An ultrasonic sensor is mounted in the press bridge, and synchronized with the press and web handling
system (WHS) software. When a splice is detected, the system alerts the operator to either skip the
splice and continue printing (
Skip and Continue
) or to skip the splice and stop printing (
Skip and Stop
).
The splice detection sensor is essentially two sensors at a fixed distance of 40 mm between them.
When the splice detector senses a splice, it sends a signal to the press WHS. The duration of the
detection signal is a maximum of 600 µs.
Based on the speed of the substrate and the distance between the splice detection sensor and the nip,
the ITM disengages to a position that avoids the splice.
If the customer had selected earlier to work in
Skip and Stop
mode, the splice is stopped on the
rewinder table and an error message is displayed in the UI indicating a splice event.
When a splice is detected by the sensor, printing stops (that is, there is no second transfer) and is
resumed based on a WHS fixed factor and the repeat length of the job.
Due to finishing needs, the avoidance area (that is, where no printing occurs) is an increment of the
repeat length.
There are two possible scenarios of where the splice is detected:
Figure 3-1
Within a repeat length (frame)
Figure 3-2
At the meeting point of two adjacent frames
26
Chapter 3
System information