Product Speed Matching Function Using A Rotary Encoder - Hitachi IJ RX2 Technical Manual

4.3.2 Product speed matching function using a rotary encoder

The product speed matching function is used when the speed of the print target or the conveyer carrying the
print target changes while the IJ printer is printing. If this function is not used, when the speed changes, the
width of the printed characters may change and the characters may be difficult to read.
When the product speed matching function is used, it is necessary to input an external electric pulse having a
period proportional to the speed to the IJ printer. Ordinarily a rotary encoder is used for this purpose. The IJ
printer can print each vertical line of the printed message in synchronization with the pulses from the rotary
encoder.
4.3.2-1 Rotary encoder specifications wiring and switch setting
(1) The specifications of the connectable rotary encoders are:
Output waveform
Output withstand voltage : 24VDC or greater
Load current
Leakage current
Power supply voltage
Current consumption
Input signal frequency
Number of pulses
*Note 1) The maximum power supply capacity of the IJ printer built-in power supply (24VDC) is
100mA. When the current consumption of the detector and encoder exceeds 100mA and the
power supply voltage is outside 24V, use a dedicated power supply and perform the wiring
work described in (3) below.
(2) Encoder wiring and setting of SW1 on PC board EZJ127 when IJ printer built-in power supply is used
(a) When open collector output and IJ printer built-in
power supply are used
Rotary encoder
SW1 setting
ON
1 2
4-13 ●Input/output (I/O) specifications
: Square wave (duty: 30to 70%)
: 20mA or greater
: 0.1mA or less
: 24VDC
: 100mA or less *Note 1
(When the IJ printer built-in power supply is used, the total current
consumption with the detectors is 100mA or less.)
: 200kHz or less
: Decided by production line conditions
24V TB1
24V
Signal
GND
Signal
GND
3 4 5 6 7 8
(b) When totem pole output and IJ printer built-in
power supply are used
24V
6
7
Signal
8
GND
9
Rotary encoder
SW1 setting
ON
ON
1
OFF
24V
24V
Signal
Signal
GND
GND
2 3 4 5 6 7
TB1
6
7
8
9
ON
8
OFF