Delta ASDA-A3 Series User Manual page 318

ASDA-A3
 Create E-Cam curve for periodic intermittent printer
Use this type of E-Cam curve when the printing material length is limited and full print cannot be
carried out. This type of curve helps to save the material, decreasing the interval between each
print pattern by retracting the material when the printing plate detaches from the material. In the
case of paper printing, the printing axis rotates at a fixed speed in a single direction. When the
printing plate and paper come into contact, the paper and printing axis starts printing with the
same linear speed, as shown in Figure 7.3.7.12 (a). Once the printing motion stops and during
the interval when the printing plate and paper are separated, the drive roll starts to decelerate
and move in the opposite direction until reaching the specified zone, as shown in Figure
7.3.7.12 (b). Afterwards, the drive roll resumes operation in the printing direction. When the
printing plate and paper come into contact again, the paper and printing axis resume a
synchronous relation and make the next print. Regarding the E-Cam curve for intermittent
printing machines, the parameters that you must set and the corresponding relation with the
printing machine mechanical structure are shown in Figure 7.3.7.13.
(a) Printing motion
(1) Printing axis; (2) Drive roll
Figure 7.3.7.12 Intermittent printing machine
N: number of pulses per printing axis revolution
A: number of gear teeth on motor; B: number of gear teeth on material feeder
PL: print length; BL: blank length
d1: drive roll diameter; d2: printing axis diameter
Figure 7.3.7.13 Printing machine mechanical structure
Motion Control
(b) Retraction motion
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