(5) When a rotary encoder is used, the print character width cannot be changed by changing the IJ printer character
width set value.
When the print character width must be changed, a device (timing belt, pulley, etc.) which varies the conveyer
speed and rotary encoder speed synch signal pulse frequency ratio must be installed.
(6) Restriction of the speed synchronization signal pulse frequency from the rotary encoder
(7) Rotary encoder selection method and calculation method
The print character width when the product speed matching function is used is determined by the amount of
movement of the product per encoder pulse.
Several examples are introduced below.
Example 1: Calculate the resolution of the rotary encoder when the rotary encoder is connected directly to the
conveyer shaft.
<Calculation conditions>
●Dot font : 5x7 dots (horizontal direction 5, vertical direction 7)
●Inter-character space : 1 dot (1 scan)
●Inter-character interval : 1.8mm [horizontal direction 6 dots (6 scans)]
(Inter-character dots 5 + inter-characters space 1)
●Diameter of conveyer pulley : 60mm
Distance the conveyer moves per 1 revolution of the rotary encoder
60mmx3.14=188.4mm/rev
Number of scans which must be executed while the conveyer is moving 1mm
6 scans/1.8mm=3.33 scans/mm
Required resolution of the rotary encoder (number of output pulses per 1 revolution of
the rotary encoder)
188.4mm/rev x 3.33 scans/mm=628PPR ( 2500PPR, Division factor=4)
1
2
3
=
.
.
Arrange for encoder signal cycle time (t1) to be at least 5 μs.
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