Paper Feed Principles - Intermec EasyCoder 601 XP Service Manual

Chapter 8 Print Unit
8.11 Paper Feed
Principles
68
The Start and Stop Adjust parameters in the printer's Setup Mode
control how the paper will be positioned in relation to the printhead
when the printing starts and after the printing is completed respec-
tively. By default, the Start and Stop Adjust parameters are both set
to 0, which is suitable for tearing of the paper web against the tear-
off edge, e.g. between labels. However, since the dot line on the
printhead is situated 15.7 mm back from the tear off edge, the
printing will not start at the top of the label but about 15 mm further
down the web.
15.7 mm
Tear Off Edge
Note that due to several factors, paper feed measurements are not exact and
may vary somewhat between applications and individual printers. There is
inevitable a small amount of slippage between paper and pressing roller,
which in its turn is affected by the printhead pressure, the type of paper or
backing paper, the thickness of the media, the type of ribbon etc. The pressing
roller may be worn, giving it a slightly smaller diameter. There is also a certain
amount on inexactness in the paper feed mechanics and belts and so on.
Therefore, you cannot expect to reach exact Start and Stop Adjust values
simply by calculation. Use the measurements given in this chapter to calculate
rough starting points and use the trial-and-error method to find values that
give the desired result.
In many cases, it is desired to start the printing immediately at the
top of the label, i.e. at the edge that is fed out first. Actually, what
you want to do is to pull back the paper to the dot line. You can do
this by means of a negative Start Adjust value (e.g. -175 dots ≈ 15
mm). Be careful not to enter too large a value (>200 dots), or the
paper may come loose from pressing roller.
15.7 mm
Tear Off Edge
Intermec EasyCoder 601 XP – Service Manual Ed. 3
Default (Tear off):
Start Adjust: 0
Stop Adjust: 0
Dot Line on Printhead
Label Stop
Sensor
Tear off (print at top of label):
Start Adjust: -175
Stop Adjust: 0
Dot Line on Printhead
Label Stop
Sensor