Use of Rapier Head

The use of rapier head

1. Overview
Since there are many types of rapier heads, the specific usage methods of each rapier head are different, but the precautions in their use are basically the same. The quality of their use will directly affect the quality of the fabric. The quality of the rapier head is not only related to the manufacturing, assembly quality and daily maintenance of the rapier head itself, but also related to the adjustment of the rapier head of the whole machine (stroke, release plate, guide hook , air suction device, rapier belt installation, etc.), in order to cooperate with the majority of users in using the rapier head correctly and correctly infer latitudinal faults related to the rapier head, you should carefully refer to the precautions when using the rapier head.
2. Precautions before using the rapier head
(1) Check the appearance of the rapier head by hand and visual inspection to see if it is completely smooth, and whether there are waste edges, burrs, or cracks.
(2) Use spinning yarn to simulate the warp passing through the back of the sword head, and there should be no yarn hooking.
(3) Open the opening and closing device and the yarn pressure plate by hand, simulate the working state of the release plate, and check whether the opening and closing of the sword head is sensitive and there is no feeling of stagnation.
(4) Before installing the sword belt, first use No. 400 sandpaper to smooth all the burr edges of the sword belt and sword head (including the base plate) (but do not grind too much), and then use No. 800 fine gauze paper to polish it again. Smooth, so that all parts in contact with the warp and weft yarns are free of burrs, so that the warp and weft yarns are not hooked.
(5) Fix the sword head to the sword belt with screws. In order to make the screws easy to screw in, soak the screws in oil first. After the sword head and sword belt are fixed, make sure that the two sword heads are at the same level when viewed from the side. (Figure 13-1), if the installation is not accurate and the rapier head is tilted, the rapier head will be worn in the longitudinal direction or the weft insertion will not be possible.

(6) When replacing a new sword head on an old sword belt that has been used, you must pay attention to check the wear of the sword belt and replace it according to the requirements of the main engine manufacturer. For example, the SM93 loom stipulates that when the width of the sword belt has been reduced by 0.5mm, the thickness has been reduced by 0.5mm, and the width between the two tooth holes has been reduced by 2mm, a new sword belt must be replaced before a new sword head can be replaced. For example, the FAST loom (Figure 13-3) stipulates that the thickness H of the sword belt at the most worn area cannot be thinner than 1.0mm, and the length F of the sword belt hole must not exceed 5.25mm.

3. Precautions after the sword head is machined
(1) When adjusting the position of the left opening and closing plate A of the left sword head, pay attention to the fact that when the left sword head passes, the pressing plate can be opened 1mm as long as it is enough to avoid unnecessary wear and tear on the left sword head, as shown in Figure 13-4.

(3) How well the heald frame is adjusted during normal operation will also directly affect the service life of the rapier head. If the heald frame is leveled too early, the lower warp yarn will have lifted the rapier head when it leaves the cloth mouth. , causing the sword head to wear out early, so the flat heddle should be delayed slightly, but the specific time will be determined according to the regulations of the host of fabric varieties.
(4) The correct installation and adjustment of the guide hook directly affects the service life of the sword head and sword belt. The user must install and replace the guide hook according to the main engine manufacturer’s maintenance instructions.
(5) The movable guide rail and the fixed guide rail constitute the working channel of the rapier head, the straightness adjustment is good or bad, and the optimal distance between the fixed guide rail and the reed (it is best to keep 2mm), directly affects the rapier head and rapier belt. life, the specific adjustment method shall be carried out according to the commissioning instructions of the OEM
.
In order to ensure the normal use of the sword head, maintenance workers must check the straightness of the track with regular rules every month. You should always check the free sliding of the sword head and sword belt in the track and the lateral gap between the sword belt and the guide rail. The gap should be small and adjusted according to the instructions on the machine, or pull out the sword head and sword belt and watch the sword head in use. If the sword is worn, replace the damaged parts on the sword head (such as springs, screws, openers, base plates, etc.) in a timely manner.
(6) Pay attention to the wear and tear of the rapier head with a bottom plate, and replace it regularly according to the instructions. If not replaced, the rapier head will be damaged quickly, making it difficult to hand over the weft yarn, and the right rapier head may even hit the guide hook, causing weaving accidents. When replacing the bottom plate, it is best to replace the screws with new ones, or install the screws originally installed at this position. Do not install them incorrectly.
4. Rapier head weft insertion failure analysis table
During the weaving process, weft faults such as errors in the handover of the left and right rapier heads often occur. The reasons are various, some are adjustment problems, and some are problems with the rapier head itself. Now we will summarize the situation See Table 13-3.

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