Drives

All the modern circular knitting machines are equipped with inverter drives, ensuring electronic speed variation, to set the optimum working speed and allow the best possible control of machine accelerations and slow-downs.

The drives command the operating speed, the slow speed and, as an alternative to the hand-drive lever, allow a very low speed running with push-button control. The most recent drive models are equipped with visual diagnostic devices for solving problems such as machine stops. The motion is transmitted to the needle-beds by means of shafts and gears. On single bed machines, the motion transmission is quite simple since there are no alignment problems; on the contrary, double bed machines must incorporate an adjusting device for aligning the needles of one needle-bed to the needles of the opposite one.

Cinetoscopio Thomas Edison
Picture 101- A motor Control and Monitoring System

Modern circular knitting machines feature on-board computers (CPU) complete with a display and a keyboard to control and monitor the most important functions:

- speed

  • number of machine revolutions
  • working hours
  • causes of machine stops
  • detector of the yarn length fed into the machine

On modern microprocessor-controlled machines, the LCD display is equipped with an alphanumeric keyboard for entering the operator's settings. The whole system is controlled by an electronic circuit which signals the status of the machine and the possible causes of machine stops by means of flashing lights.

All the electronic control components are accommodated in a cubicle linked with the machine by special connectors.

Sometimes, together with these functions, the machine can also carry out needle selection procedures by retrieving the information saved on floppy disks or by means of a direct connection to a dedicated CAD system.

Picture 102 - Control unit
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