Application Examples ASDA Series Application Note
3-92 March, 2015
3.6.3.3 Design of E-cam curve
Types of flying shear curve
A variety of flying shear curves is offered by ASDA-A2. See Figure 3.6.13. There are three kinds
at the moment. One is to build the curve which has no synchronous zone by PC software. The
other one is to build the curve which has synchronous zone and remains at 51 degrees by PC
software or macro command. The last one is to build an adjustable curve that has synchronous
zone but can only be done by macro command. The advantage of building the flying shear curve
in servo drive is that when the cutting length changes, users only need to setup the relevant
parameter on HMI interface. After issuing the macro command, the curve is built. This is a great
design for multi-process recipes machine. The definition of the calculation in synchronous zone
and cutting length proportion will be elaborated later.
Figure 3.6.13 Camshaft curve
Meaning and calculation of synchronous zone
The synchronous zone on flying shear curve is the sealing length of wrapping paper, which is the
arc length of cutting action. (If the cutter is not wide enough, the cutter width and arc length of
cutting action can be regarded as the same distance) During the cutting process, when it travels
to the synchronous zone which is the position the cutter starts to seal, if the cutting speed does
not equal to the film feeding speed, the packing film will be lengthen or squeezed. That proves
that the synchronous zone is vital to flying shear application and has to be accurate. The
calculation is shown in Figure 3.6.14.
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