Thread Tightener

During the interlacing or the chaining process, different tensions appear in the thread by the take-up lever and/or shuttle movement. The thread tighteners are responsible for many different tasks. On the one hand they control the holding of 

Transport is the relative movement of the fabric to the previously produced interlacing or chaining point. Seam production is defined by the succession of the relative movements between two stitches. Transport generally occurs only if the needle is outside the fabric. The next paragraph describes the relative movement between the fabric and the sewing machine. 

The transport of the fabric happens by the cooperation of feeder and pressure foot. The easiest case is if the feeder penetrates the throat plate, presses the fabric against the pressure foot, and moves it by a stitch length (feed). Exceptions are the needle transport machines. 

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In Sussex, a tradition is to take an elder twig, tie it in three or four knots and carry it in one s pocket to protect the bearer from rheumatism. Elder twigs have also been used as an amulet to help prevent epilepsy. According to Anatomie of an Elder, "In the month of October, a little before the full moon, pluck a twig of the Elder and cut the part out between two joints. Cut into nine pieces, tie them up in a linen cloth and bind above the heart with thread. Tighten until the thread breaks, remove the amulet with an instrument and bury in the ground, so nobody can touch it."... 

Another method is to set the heater in a conical brass bushing with a dismantling thread (b). A further method of removing the heater is to use a threaded tightening ring, e.g., with a conical heater flange (c). 

Thread tightener The adjusted removal strength is responsible for the correct position of... 

Unlike the double lock stitch, the looper thread for the double-chain stitch (Fig. 10.6) is fed from a supply reel on the reel stand over guiding and thread-tightening elements to the thread-guiding gripper. The different phases of the interlacing of needle thread and bobbin thread by a double-chain stitch are as follows ... 

Locate leaks Apply soap solution to tape bleed holes and threaded connections depressure when tests are done. Block in N2 and check for loss of pressure. Check all connections. Same as in Step 1. Tag flanges to identify leaks tighten or repair leaks each time a system is pressurized, drain condensate at low-point bleeds. 

Tubes may be inserted into a tubesheet, and packing may be added between them and the tubesheet. A threaded ferrule is inserted to tighten the packing. This type of joint is used only for special expansion problems. 

Incorrect - will damage flare or threads, or cause sleeve to crack under vibration if tightened... 

Generally, the length of thread used should be more than 1.5 times the diameter, the section thickness around the hole more than 0.6 times the diameter. Avoid having feather edges, and limit tightening with the bolt shoulder. 

The most commonly used types of closures are shown in Fig. 4.3-18 [14], The cover seals (Fig. 4.3-18 A - E) are attached by means of threaded bolts and are used for all diameters and pressure ranges. The bolts are generally tightened hydraulically or pneumatically. It is, however, also possible to pre-stress the bolts longitudinally and then to tighten the nuts. 

Place bowl body on spindle. Apply a little tallow to the thread of screws C29 and put the screws into the holes in the bowl body. Then turn the bowl body slowly until the screws enter the holes of the distributing ring. Screw them in and tighten ... 

Tallow the thread of small lock ring C2 and screw on the ring anti-clockwise. Tighten firmly. 

Press down the inlet pipe and turn hand wheel (A18) anti-clockwise, until the thread of the pipe engages with the paring disc thread. Then let up the handle and tighten firmly. 

Tighten the screws into the two threaded holes in operating slide C22 and lift out the latter. 

Screw down the puller on the thread of ball bearing lousing DA4. Tighten the screw of the tool until the housing and ball bearings are pulled off the spindle. 

If the ball bearing should be exchanged, screw jack screws into the threaded holes of the conveyor pulley and tighten against the protecting cover until the bearing is pressed loose. 

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