Yarn Feeding:
The yarn feed to the needles in order to form the fabric must be conveyed along a predetermined path from the spool/ cone to the knitting zone. The various motions along this path guide the yarn (thread guides), adjust the yarn tension (yarn pensioners’), and check for eventual yarn breaks. Flow chart of yarn feeding mechanism is as follows:
In a knitting cycle, yarn feeding is commonly fed at the same time as the needle is raised for clearing and the hook is open. For non-stop knitting, yarn is to be supplied or fed to the needles or to the knitting zone continuously. In weft knitting, yarn is usually provided from cones or other appropriate yarn packages located in a creel.
The yarn is taken down from the spool organized on a unique holder called creel if located beside the machine, or rack if placed above it. The yarn is then guided into the knitting zone through the thread guide, which is commonly a small plate with a steel eyelet for the yarn. In order to acquire particular designs along with intarsia and vanish effects, the machines are prepared with special thread guides.
Flow Chart of Yarn Feeding Mechanism from Creel to Needle
Creel
↓
Cone
↓
Tube
↓
Tube/Pipe
↓
Magnetic Tensioner
↓
Sensor
↓
Ceramic Eye Pot
↓
Yarn Wheel (Positive/negative feeder)
↓
Previous Sensor Guide
↓
Sensor
↓
After Sensor Guide
↓
Ceramic Eye Pot (feeder Ring)
↓
Feeder
↓
Needle
A yarn feeder comprises a switching mechanism that presets a swing direction of the yarn feeding port after completion of a yarn feeding operation, and, after having completed yarn feeding operation, changes over the swing of the yarn feeding port from one yarn feeding position to another standby position interlocking with the released selective operation of the entraining means, in which the switching mechanism includes a feeder rod having a yarn feeding port at its lower end, which is composed of at least two members, both of the members being arranged to relatively slide each other in a vertical direction and provided with a push-up member to force upward respectively.
Author of this Article: Rofiquzzaman Raju Fabric Technologist, B. J. Group, Mawna, Gazipur Email: [email protected]