In the knitting process of single jersey fabrics, the cooperation of knitting needles and sinkers is crucial. They jointly complete complex actions such as yarn looping and loop withdrawal, thus forming knitted fabrics with specific structures and properties. The following is a detailed explanation of the cooperation of knitting needles and sinkers in the knitting process:

1. The role of knitting needles
The knitting needles are key components on single-sided knitting machines, which are responsible for knitting yarns into coils. During the knitting process, the knitting needles mainly complete the following actions:
Yarn padding: Under the guidance of the yarn guide, the knitting needle pads the yarn into the needle hook to prepare for the subsequent looping action.
Looping: When the knitting needle moves downward, the yarn in the needle hook forms a new coil as the knitting needle bends.
Loop withdrawal: After looping, the knitting needle needs to move upward to withdraw the old coil from the needle hook for the next round of knitting.

2. The role of sinkers
The sinkers play an auxiliary role in loop withdrawal and looping during knitting. Specifically, the sinker helps the knitting needle complete the following tasks through its specific shape and movement trajectory:
Assisted loop withdrawal: During the process of knitting needle loop withdrawal, the jaw (or tiger's mouth) of the sinker can block the fed yarn to prevent the yarn from being re-threaded by the knitting needle or breaking the old coil. At the same time, the sinker can also hold the old coil at the mouth of the needle cylinder to prevent the old coil from rising with the rise of the knitting needle, ensuring the smooth progress of the loop withdrawal action.
Assisted loop formation: During the process of knitting needle loop formation, although the sinker does not directly participate in the loop formation action, its position and shape will affect the sinking arc of the new coil and the stability of the coil. Therefore, by adjusting the position and shape of the sinker, the coil structure and performance of the fabric can be optimized.

3. Coordination of knitting needles and sinkers
The coordination of knitting needles and sinkers in the knitting process is mainly reflected in the following aspects:
Position coordination: The position of the sinker needs to be adjusted according to the movement trajectory of the knitting needle and the knitting requirements. For example, before the knitting needle is withdrawn, the jaws of the sinker should push the old coil away from the top of the needle to prevent the old coil from being re-threaded or broken. At the same time, the position of the sinker also needs to consider the sinking arc of the new coil and the stability of the coil.
Shape matching: The shape of the sinker (such as the size and shape of the jaws) will also affect its coordination with the knitting needle. For example, the shape and size of the jaws need to adapt to different yarns and knitting requirements to ensure that the old coil can be effectively held and pushed away.
Action matching: During the knitting process, the actions of the knitting needle and the sinker need to be closely coordinated. For example, when the knitting needle is withdrawn, the sinker needs to maintain a stable grip to prevent the old coil from rising; when the knitting needle is looped, the sinker needs to maintain an appropriate position to avoid interfering with the sinking arc of the new coil.

In the knitting process of single jersey fabrics, the knitting needle and the sinker jointly complete the complex actions of yarn looping and looping through precise position matching, shape matching and action matching. This coordination not only determines the structure and performance of the fabric but also affects the appearance and feel of the fabric. Therefore, in the knitting production process, the matching parameters of the knitting needles and sinkers need to be strictly controlled to ensure the quality of the fabric.