Highlights

The SIMATIC S7 automation system and SIMODRIVE drive system offer the following advantages for open and closed-loop control of the knitting machine:

• Monitoring of machine, operating and machine data input
• User prompting, operating status and error display
• Interlock and safety functions on the machine via digital I/Os
• Heater control system for the machine bed
• Yarn feed control with synchronization function for all beam axes
• Movement of the warp beams
• Fabric take-off control
• Delivery system controller (if no beams are used).

Область применения

Together with weaving, knitting is one of the most important processes in textile production.

In the knitting process, the warp yarn is wound off beams and presented for knitting. Depending on the type of knitting machine, yarn feed must be continuous or must take place according to a defined time sequence. In the knitting process, the warp threads are interlocked with guide bars which move vertically as well as oscillating from side to side. The movement of the guide bars is controlled mechanically.

The fabric take-off axis removes the knitted material from the vicinity of the knitting elements. Finally, the knitted fabric is rolled.

The movement of all axes and the knitting elements must be synchronized with the movement of the main shaft. The main shaft acts as a master axis in generating the control setpoint as an input signal for the control.

Дизайн

The automation system is composed as follows:

• SIMATIC HMI TP27 operator panel
• SIMATIC S7-300 programmable logic controller with various I/O modules, MPI interface to TP27 and to lower-level synchronization control module SIMATIC IP 252 MC
• SIMATIC IP 252 MC synchronization control modules
• SIMODRIVE 611 analog converter system
• SIMODRIVE 1FT5 servo motors.