Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . ack so that the layhas to beat up several at one time. This makes it impossible tohave as heavy a cloth as in the former case. , When setting the harnesses, before the yarn is tied to the apronor leader, they should be in such a position as to allow the yarn torest upon the race when the shed is first opened, because when thefilling is put in the shed it is closed, and this lifts the yarn up fromthe race plate. Thus, if the harne
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . ack so that the layhas to beat up several at one time. This makes it impossible tohave as heavy a cloth as in the former case. , When setting the harnesses, before the yarn is tied to the apronor leader, they should be in such a position as to allow the yarn torest upon the race when the shed is first opened, because when thefilling is put in the shed it is closed, and this lifts the yarn up fromthe race plate. Thus, if the harnesses are set high at first, they haveto be changed as soon as the filling is placed in the shed. H? WEAVING. 103 Fig. 68 shows a loom with the cams fixed at the side of theloom. The harnesses are connected with the quadrant lever, whichis fixed to the supporting bar. A small arm is fixed to the back ofthe supporting bar, but at one end. A rod connects the arm withthe treadle. The cams are on a sleeve, placed on the pick cam shaft,and to the sleeve a large gear is attached. In the diagram this gearhas 120 teeth. A gear with 30 teeth is fixed on the crank Fig. 68. Loom with Cams ou the Sides. and through an intermediate it imparts motion to the cam gearing is set for a four-harness twill, whether one up and threedown, or two up and two down. (See cam in Fig. 69.) As explained in the construction of cams, one revolution of thecam equals the number of picks to the pattern; so that the gearfixed to the crank shaft must divide as many times in the large gearas there are picks to the pattern : 120-^30 =4. This is one ofthe simplest motions for shedding by means of cams, and is veryeasily fixed. It is in direct contrast to the roll-top motion shown inFigs. 70 and 71. The least change on any harness in this motionalters the rest, for owing to the method of connecting the harnessesthey are dependent upon each other. 113 104 WEAVING. The rollers are made with different c
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