1. Core Function
** * Guide the yarn: ** Precisely guide the warp yarn from the warp axis to the hooking area of the knitting needle.
** * Control of yarn padding: ** Under the left and right lateral movement (yarn padding at the front of the needle) and the front and back swinging (yarn padding at the back of the needle) of the comb, the yarn guiding holes on the yarn guiding needle guide the yarn to cushion according to the preset pattern cycle (the lateral movement determined by the chain block or the CAM of the flower disk), forming a coil structure.
** * Separated yarns: ** To prevent adjacent warp yarns from entangling or rubbing against each other.
** * Protecting the yarn: ** Smooth edges of the yarn guiding holes reduce wear on the yarn, which is particularly crucial for fine denier, highly elastic or fragile yarns.
2. ** Physical Structure **
** * Material ** : Usually made of ** high-strength, high-wear-resistant and impact-resistant alloy steel **, the surface is ** precisely polished ** (sometimes even hard chrome plated or coated with other wear-resistant coatings) to reduce friction and yarn damage. For example, 30CrMo, 60Si2MnA, etc.
** * Shape ** : It is a slender and thin sheet (like a miniature comb), with the length matching the width of the comb.
** * Key parts: **
** * Yarn guiding hole: ** Located at the very front of the yarn threading plate **, it is the core part through which the yarn actually passes. The size of the hole diameter, shape (circular, elliptical, teardrop-shaped, etc.) and the smoothness of the inner wall have a decisive influence on the permeability, tension and wear of the yarn. The hole diameter should be slightly larger than the diameter of the yarn, ensuring smooth passage of the yarn while minimizing shaking as much as possible.
** * Neck: ** The thinner part that connects the yarn guide holes and the main body has a certain degree of elasticity, allowing for slight deformation to absorb energy when impacted (such as colliding with the knitting needles), thereby reducing the risk of breakage.
** * Main body/Root: ** The thicker part, used for ** fixing on the comb **. The root has specific grooves, holes or shapes to ensure that it can be firmly, precisely and quickly installed in the slots or clamps of the comb and comb, and the height and front-back position of all the threading pieces on the comb and comb must be strictly consistent.
** * Spacing ** : The spacing between the warp knitting pieces (commonly referred to as "stitch spacing") strictly matches the machine number of the warp knitting machine (the number of knitting needles per unit length of the needle bed, for example, E28 indicates 28 needles per inch). The higher the machine number, the finer the yarn threading.
3. ** Relationship with combs: **
The gauze thread is installed on the comb. A comb will be installed with ** a whole row ** (hundreds or even thousands) of threading pieces, with the arrangement density consistent with that of the needle bed.
The comb is responsible for carrying out complex compound movements together with all the thread pieces on it:
** * Forward and backward swinging: ** Swing back and forth in the needle gap to complete the back needle padding (place the yarn pad behind the needle bar) and front needle padding (place the yarn pad in front of the needle hook).
** * Left and right lateral shift: ** According to the pattern requirements, precisely move 1, 2 or more stitch distances left and right to change the position of the yarn relative to the knitting needles, forming different loop connection structures (such as chain weaving, warp flat, warp velvet, warp satin, etc., and their changing organizations).
The yarn thread does not move actively by itself. Its movement is completely driven by the comb.
4. The meaning of "threading yarn"
"Threading the yarn" refers to the process where, during the preparation for the machine's operation, the operator, based on the process design (design drawing or threading drawing), successively passes each warp yarn through the corresponding yarn threading plate guide holes on the corresponding comb.
The process design determines:
** * Hollow threading: ** Which threading pieces' guiding holes ** do not pass through ** yarn (used to form mesh, reduce yarn usage, and achieve specific pattern effects).
** * Yarn threading: ** Which yarn guide holes are used to thread the yarn, and ** The color, type, and sequence of the yarn inserted ** (for example: 1 through 1 empty, 2 through 2 empty, full threading, or more complex pattern threading methods).
** * Correspondence: ** Which warp (or which group) of yarns corresponds to each yarn guiding hole of the yarn threading piece.
The ** * yarn threading diagram ** (similar to the code 'R-3R-2-0' you provided earlier, etc.) is the instruction that describes this yarn threading pattern. Usually:
* 'R-3' : It may represent the position of the third yarn Guide needle in the Right Guide Bar.
* 'R-2-0' : It may indicate that the second yarn guide needle position of the right comb is not threaded (0 represents empty threading).
* 'R-3R-2-3' : It may indicate that both the third and second yarn guiding needle positions of the right comb are filled with yarn (3 May represent the insertion of a certain specific yarn or color). The specific meaning needs to be combined with the machine model and process description. It is a blueprint guiding workers to carry out the actual yarn threading operation. **
5. ** Importance **
The cornerstone of fabric structure: The yarn threading pattern (empty threading/full threading/flowered threading) and the lateral movement of the comb jointly determine the basic structure of the fabric (mesh, density, elastic areas, etc.).
The core of pattern realization: The color distribution, pattern outline and texture effect of the pattern of multi-comb warp knitting machines (such as those with Jaka devices) are highly dependent on the different yarn threading methods (threading different colors/types of yarns) on different comb combs and their respective lateral movement.
** * Production Efficiency and Quality ** : Correct yarn threading is a prerequisite for ensuring the smooth operation of the machine, reducing yarn breakage, avoiding misalignment, and guaranteeing uniform fabric quality. Threading the wrong yarn may cause the entire piece of fabric to be scrapped.
6. ** Common Issues and Maintenance: **
** * Wear of the yarn guiding holes: ** Long-term friction can cause burrs, deformation, and an increase in the diameter of the inner walls of the yarn guiding holes, increase the fuzz and breakage rate of the yarn, and even scratch the yarn. Regular inspection and replacement are required.
** * Bending deformation ** : Accidental impact (such as improper operation, flying flowers or hard objects getting stuck) or long-term stress may cause the yarn threading piece to bend, damaging its precise position, resulting in inaccurate yarn padding, impact pins, and fabric surface defects.
** * Fracture ** : Severe impact or material fatigue may cause the yarn piercing piece (especially the neck) to break.
** * Blockage: ** Flying flowers, oil stains, sizing materials, etc. clog the yarn guiding holes, hindering the passage of yarn.
** * Installation errors: ** Failure to install properly, inconsistent heights, and positional deviations from the front and back will all affect the accuracy of the yarn padding.
** * Maintenance Points: **
** * Regular cleaning: ** Remove flying flowers and oil stains.
** * Regular inspection: ** Use a magnifying glass to check the wear of the yarn guiding holes and whether there is any bending or breakage.
** * Correct installation ** : Ensure that the installation is firm, the height is consistent, and the front and back positions are accurate (usually calibrated with dedicated gauges).
** * Timely replacement: ** If any yarn threading pieces are found to be worn beyond the standard, bent or broken, they must be replaced immediately, and ** must use yarn threading pieces that are exactly the same as the original model (size, material, shape of the yarn guiding holes) **. There may be slight differences in the yarn threading pieces for different models and different comb positions (front comb/rear comb).
** Handle with care: ** Avoid bumps and knocks during installation, disassembly and cleaning.
7. ** Major manufacturers ** : Similar to knitting needles, top manufacturers also produce high-quality threading pieces, such as:
Groz-Beckett
Swiss Stinger Group
The important industries of Kinsui
** Summary **
The yarn threading sheet is the "precise navigator" in the yarn path system of the warp knitting machine. Although it is small, its material, precision, condition and the correct yarn threading method are the absolute prerequisites for weaving fabrics with the predetermined organizational structure, exquisite patterns and high quality. It closely cooperates with core loop-forming components such as knitting needles, settling plates, and combs to jointly complete the high-speed and precise warp knitting process. Understanding the function of the yarn threading sheet and the meaning of the yarn threading diagram is the basis for operating, maintaining and designing the warp knitting process.
* * about your offer code (` 3 R - R - ` 2-0, ` R R - 4-2-2 `, ` 3 R - R - 2-3 `) : * *
This looks like a fragment of a "yarn threading process sheet", and it is very likely to describe the yarn threading status at several consecutive yarn guiding needle positions on the same comb (possibly the right comb R). The specific meaning can only be fully determined by combining the context (machine model, total number of stitches, flower width, process description), but the common interpretation mode is:
** * 'R-3' : ** represents the position of the third yarn Guide needle of the "Right Guide Bar".
** * 'R-2-0' : ** represents the position of the second yarn guide needle of the right comb. '0' usually indicates ** empty threading ** (no yarn threading).
** * 'R-2-2'/' R-2-3 ': ** represents the position of the second yarn guide needle of the right comb. The numbers' 2' or '3' usually indicate ** yarn insertion **, and this number may represent:
The yarn inserted is the second (or third) warp yarn (arranged in the order on the warp axis).
The yarn inserted is of the second (or third) color or type (the color/yarn type number will be defined at the beginning of the process sheet).
In Jaka warp knitting, it may represent specific Jaka jacquard information (but this usually comes with a separate Jaka design).
How to understand these three lines
1. ** 'R-3R-2-0' : ** It may indicate the description starting from the ** third yarn guide needle position ** of the right comb. 'R-2-0' represents the second position immediately following (that is, the actual fourth position?) Logically, there is a bit of a jump. (It might be a typo or a specific notation.) It's an empty hole. A more reasonable interpretation might be that the yarn is threaded at the 'R-3' position (implied, the absence of a number might represent threading the default yarn), and the empty thread is threaded at the 'R-2' position (' 0 ').
2. * * ` R R - 4-2-2 ` : * * may said ` R - 4 ` position wear gauze (implicit), ` R - 2 ` position in 2 kinds of yarn (` ` 2).
3. * * ` 2-3 ` : 3 R - R - * * may said ` R - 3 ` position wear gauze (implicit), ` R - 2 ` position in 3 kinds of yarn (` 3 `).
** Key point: **
This seems to describe different positions of the yarn guiding needles on the same comb (R) (the numbers may be consecutive, such as 2,3,4...) The yarn threading state.
* * * digital suffix (` ` 0, 2 ` `, ` 3 `) is the core information * * : ` 0 ` = empty wear, not ` digital = 0 ` wear gauze (usually on behalf of the yarn type/color number).
* ` R - 3 ` ` R - 4 ` ` R - 2 ` * * is likely to be the number in the yarn guide pin on the guide bar position no. * *. Numbering rule (from left to right?) Start from the middle? It is necessary to refer to the overall description of the process sheet.
To fully understand, it is necessary to know:
How many needle positions are there in total for this comb (R)?
Which section of the pattern cycle does this description of threading yarn refer to? What is the flower width (the width of a repeated flower shape and the number of stitches)?
What colors or yarn types do the numbers' 2 'and' 3 'specifically correspond to? There will be a yarn allocation table at the beginning of the process sheet.
