Confectionery packaging factory goes servo
A
Yaskawa Electric Europe product story
Edited by the Engineeringtalk editorial team
Jun 11, 2001
Yaskawa Electric's integrated machine control solution, MotionSuite, has been used to convert a sleeve wrapper machine at a confectionery packaging factory, from mechanical to servo technology
Yaskawa Electric's advanced integrated machine control solution, MotionSuite, has been used to convert a sleeve wrapper machine at a confectionery packaging factory, from mechanical to servo technology.
The MotionSuite, running with a series of MP940 single axis motion controllers, controls all machine functions including motion control, network master and PLC functionality and has delivered major cost savings from increased throughput and fast changeovers.
The form, fill and seal wrapping machine packs chocolate bars at high speed.
Printed plastic, fed from a roll, is wrapped around a mandrel to form a tube into which the bars are fed from a conveyor.
Once inside, the chocolate is transported by the tube, which is then sealed and separated.
The new control scheme consists of two pairs of pinch rolls, which pull the plastic tube from the form mandrel.
The pinch rolls, which are driven by Yaskawa Sigma II digital servo drives under MP940 control, then transport the tube, seal the seam to complete the tube and centre the printing on the plastic over the chocolate bar.
This process uses an advanced digital gearing algorithm, which includes registration to assure the positioning relationship of the printing to the chocolate bar.
The digital gear function is coordinated by the master MP940 control on a flying seal knife.
The seal axis consists of a complex cam movement that accurately seals and separates the plastic tube, to form individual pouches around the chocolate bars.
By close control of the cam profile, the bars are closely spaced but accurately centred in the pouches.
The master MP940 control also provides an adjustable analogue output signal, which is used to control the speed of the conveyor feeding the bars.
In addition to coordinating the input conveyor, the feed/registration roll and the seal knife, the MP940 also controls all the I/O (inputs/outputs) on the machine.
This function consists of correlating digital and analogue points - which are a combination of integral I/O on the servos and controls, together with remote I/O, controlled across the digital machine network.
As well as decreasing the changeover time between products and improving productivity, the integrated design has given further advantages over other design schemes.
These include significantly simplifying programming, reducing the network loop update time, minimising maintenance and substantially reducing both the physical size and the installed cost of the machine.
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