Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 572

12. APPLICATION OF FUNCTIONS
(c) Compensation with mark sensor input
This system detects registration marks that have been equally printed on the sheet, and
compensates the difference between the actual cam axis one cycle current value and the ideal cam
axis one cycle current value (set value of the cam position compensation target position) by shifting
the synchronous phase of the rotary knife axis and the conveyor axis.
Setting example: When the ideal registration mark position is 150 mm and the mark is not detected
Item
Assignment of CPCD (Cam position
compensation request)
Cam position compensation target
position
([Cam control data No. 60])
Cam position compensation time
constant
([Cam control data No. 61])
Main axis current value
Cam axis one cycle
current value
Rotary knife angle
(Cam axis feed current
value)
Conveyor travel distance
(Cam axis input amount)
Sheet
CPCD
(Cam position
compensation request)
Note. The dot-and-dash line in the above figure shows a waveform of when compensation is not executed.
unless the conveyor feeds the sheet by 151 mm due to stretch
By executing compensation, the rotary knife cuts the sheet keeping the distance of
50 mm between the ideal position for detecting the registration mark and the
position for cutting the sheet.
Assign "CPCD" for an input signal pin with the input device selection parameter. Refer to
section 7.2.4 for details.
In this example, the ideal position for detecting the registration mark is 150 mm position from
the cam axis one cycle current value. Set "150" for the cam position compensation target
position.
In this example, the position compensation is executed by one-shot. Set "0" for the cam
position compensation time constant.
151 mm
150 mm
360°
180°
0°
200 mm
150 mm
Registration
mark
Cutting position
ON
OFF
Fig. 12.1.4 Control example of cam position compensation
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Setting and operation
The difference (1 mm) between the registration mark detection
position (151 mm) and the cam position compensation target
position (150 mm) is compensated.
200 mm 201 mm
150 mm 151 mm
50 mm
12 - 31
(Note)
201 mm
151 mm
50 mm 50 mm