Optimal latch guidance in knitting 

Low tolerances, high value added

 

Precise guidance and bearing of the needle latch is the basis of:

  • Long needle service life
  • Maximum machine speeds
  • Processing safety in production

Why is precise latch guidance so important?



Spoon latch type needle

Prim latch type needle

Only a precise design of latch bearing ensures that the needle latch moves axially and radially without deviation, thereby guaranteeing optimal latch guidance.

Over time the latch hit the side of the needle hook and gradually begin to loosen. Optimal latch guidance helps prevent this, resulting in:

  • Reduced wear and tear on the latch spoon, latch shank and the cheek walls
  • Much longer needle service life

If no optimal latch guidance exists, the initial latch play can be so high that the latch goes under the hook. This leads to knitting defects and machine downtime. Because of the increase in latch play the latch can be deflected sideways to such an extent that the latch head becomes subject to lateral wear from the sinker. Thanks to precision, knitting-machine needles from Groz-Beckert the effects of these problems are reduced and result in:

  • Less damage to yarn and fewer broken latches
  • Higher product quality due to minimized defects


Durability of needle latches



The stress on the needles increases in proportion to the number of feeds and the operating speed (rpm) of the machine.

The latch head strikes the hook at high speed when closing, likewise the latch seat in the shank when opening. The tip of the latch may reach speeds of up to 200 km/h.

 

The action of the latch striking the hook at a speed of up to 200 km/h generates extreme impact force. To distribute this force across the largest possible area, knitting-machine needles from Groz-Beckert have precisely executed latch shapes. These reduce the surface pressure, thereby decreasing the degree of wear.

During knitting the needles – especially the loop forming parts – are subjected to extreme stress. As the needle moves within the cam track high forces are exerted on the needle butt that travel through the needle to the hook. The resulting vibrations can lead to fatigue failure. Knitting-machine needles from Groz-Beckert meet these challenges



The right latch guidance for an optimal result


Axial deviation

Radial deviation

Possible deflection

Latch under the hook

New latch head

Worn latch head