Views: 64 Author: A-ZEN Academy Publish Time: 2022-04-09 Origin: Original
Raschel Jacquard Warp Knitting Machine refers to the Raschel Warp Knitting Machine with the Piezo-Jacquard system. The most well-known Raschel Jacquard Warp Knitting Machine model is TH-4/1F or RJPC4F. Besides, TH-5/1F and TH-7/1F become popular in recent years because of the vertical blinds warp knitting curtain or smart curtain.
TH-4/1F is the most classical machine model of Raschel Jacquard Fall-plate warps knitting machines; its textile application is widely used in garments and home textiles, such as curtains, table covers, and chair covers.
The piezo jacquard placed front moves in a shogging way only, and the fall-plate moves vertically, while ground bars behind move both shogging and front-and-back form.
The advantages of this mechanism structure of the TH-4/1F lie in that the piezo jacquard could make a two-needle overlap. One advantage of the two-needle overlap is that the fall-plate effect becomes more obvious (3D effect), especially after the dyed yarn or the colored yarn is used on jacquard needles, which makes it outstanding from the ground net. (see image 1)
What’s more, piezo jacquard needles move either overlap or underlap, so the lapping movement becomes various, and the longer reciprocating lapping movements is possible.
image 1
Besides, the new advanced connecting link component is applied on TH-4/1F and its improved models TH-5/1F and TH-7/1F. Thanks to that, the machine's speed could reach 600rpm under stable running conditions.
Image 2 indicates the connecting link component. The left is the TH-4/1F structure, and the right is the traditional structure.
image 2
The left structure ensures a more stable movement of the fall-plate mechanism and keeps the same distant space to compound needles when it is either before or behind the compound needles. Because of this, the fall plate stitch is higher density instead of loose.
Image 3 indicates the fall plate position to the piezo jacquard needles.
Image 3
It shall be pointed out that, because the fall plate position to needles keeps nearly the same always, the fall plate and fall plate yarn touch surface become less, and it reduces the friction between them, hence, it increases machine running speed as well as machine running life-span.
Compared with the traditional warp knitting fall plate machine structure, the A-ZEN TH-4/1F Raschel jacquard machine’s ground bars move, and this subtle movement stitch GB2 bar in different positions under overlap and underlap (see image 4, the black dot presents overlap and underlap yarn lap position).
image 4
This structure saves space for the fall plate and compound. What’s more, because the ground bars move, it leaves more time for the fall plate when pressing yarn and making stitch loops during the overlap process, and the lower looping position makes the ground bars work easier, thus the same direction fall plate effect is possible.
When the same direction fall plate forms, the shogging process starts, so the ground yarn barely touches the fall plate yarn. Fall plate loops shall be under tongue needles when overlapping (see image 5).
image 5
It is obvious that the ground yarn (red color) and the fall plate yarn (yellow color) are separate.
The same-direction fall plate effect is another characteristic of the TH-4/1F Raschel warp knitting machine. The difference between the same or reverse direction fall plate effect is as follows:
Reverse In-lay appears as an “8” form, the looptail makes a 3D effect, while the whole pattern looks unclear and loose. The reason is that this effect is accomplished by both fall plate yarn and ground bar yarn (see image 6).
image 6
Because of reverse looping, fall plate yarn and ground yarn are independent, jacquard yarn is pressed by the fall plate, and ground yarn gives no interference and is placed in position A. Because ground yarn stop at jacquard yarn's backside, jacquard yarn finds no block at position B, so the fall plate effect looks like “8” form(see image 7).
image 7
The above image shows that the open stitch of the jacquard yarn and the ground yarn move in the same direction; the ground yarn loop tail works on the jacquard yarn. Because of the open stitch, position A receives no pressing force, and so the jacquard yarn and in-lay yarn are combined. This kind of in-lay effect is different from ground bar in-lay alone; it is more suitable for loops across more than 3 needles.
Jacquard loop at Position A， ground yarn avoids block jacquard back looks since it is an open stitch
loop tail of A covers jacquard yarn B. When the stitching process is done, the jacquard yarn turns to the left.
1. Raschel Jacqaurd Machine Catalog: TH-4/1F, TH-5/1F, TH-7/1F
2. TH-5/1F Vertical Curtain Working Video: Vertical Curtain Raschel Jacquard Machine
3. TH-4/1F Mesh Curtain Working Video: Warp Knitting Curtain Machine
A-ZEN services branches located in Zhejiang (China), Fuzhou (China), Changzhou (China), Surat (India), Istanbul (Turkey), and Cairo (Egypt), we offer machine maintenance, technical training as well as textile development service for our customers.
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