Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . of this motion is that if the loom should berun in the opposite direction, the cloth is turned back at the sametime, because the driving motion is reversed. This prevents themany thin places that occur with the intermittent motion. 158 i WEAVING. 145 Intermittent. The .simplest form of take-up motion in useat the present time, is one that has only three gears. A ratchet,small pinion (which is also the change gear), and the beam g
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . of this motion is that if the loom should berun in the opposite direction, the cloth is turned back at the sametime, because the driving motion is reversed. This prevents themany thin places that occur with the intermittent motion. 158 i WEAVING. 145 Intermittent. The .simplest form of take-up motion in useat the present time, is one that has only three gears. A ratchet,small pinion (which is also the change gear), and the beam such a motion, there is not a wide range for the changingof the number of picks per inch, so that these motions are gener-ally used in the weaving of coarse goods. The most common range or train of gears is such as shown inFig. 98. This motion allows a very wide range for changing, butwhen, as sometimes happens, an order necessitates a half pick in-crease per inch, additional gears must be added; so that insteadof five gears, there would be seven; or a change would be madein the stud gears. Fig. 99 shows the ratchet receiving motion from a draw -A 100. C54 Intermittent Take-Up Motion. lever commonly called the take-up lever. This lever receivesmotion from a cam fixed on the pick-cam shaft. Sometimes thecam is on the crank shaft. On other looms the motion as inFig. 98, is imparted by the lay sword. Whatever kind of motionis used, it is best, so far as possible, to set the pawls so that theywill turn the ratchet while the harnesses are level, or nearly so,because at this time there is the least strain on the yarn, and itrequires less power to turn the gears. There is also less possibil-ity with this setting for the pawls to slip over the teeth of theratchet, owing to the small amount of strain on the yarn. Thecorrect time to set the cam H, i-s to have the throw of the cam atthe front center, when the crank shaft is between the bottom andfront centers, but slightly inclin
Size: 2259px × 1107px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectweaving
