针织学(双语)课件Chapter2

1、1Chapter 2Basic mechanical principles of knitting technology22.1 The sinker 沉降片沉降片nThe functions of the sinkerLoop formation 成圈成圈Holding-down 握持握持Knocking-over 脱圈脱圈32.1 The sinker 沉降片沉降片The first function: loop formation 成圈成圈On bearded needle weft knitting machines of the straight bar frame and sink

2、er-wheel type/带弯纱轮的带弯纱轮的平型纬编钩针机平型纬编钩针机, the main purpose of a sinker is to sink/弯曲弯曲 or kink/扭结扭结 the newly laid yarn into a loop.4带弯纱轮的平型纬编钩针机带弯纱轮的平型纬编钩针机5The second function: holding-down 握持握持N: nib of nose of sinker 片鼻片鼻T: throat 片喉片喉6The third function: knocking-over 脱圈脱圈B: belly 片颚片颚V: the verg

3、e or upper surface of the trick-plate 针槽板针槽板72.2 The jack 底脚片底脚片,挺针片挺针片It may be used to provide versatility of latch needle selection and movement.It is placed below the needle and has its own operating butt and cam system.82.3 Cams 三角三角,凸轮凸轮Cams are the devices which convert the rotary machine dri

4、ve into a suitable reciprocating action for the needles and other elements.The cams are of two types, engineering cams/工程凸轮工程凸轮 and knitting cams/针织三角针织三角.9n2.3.1 Engineering cams 工程凸轮工程凸轮The drive is transmitted and adapted via cam-followers/凸轮转凸轮转子子, levers/连杆连杆, pivots and rocker shafts/摆杆摆杆. It

5、produces all the required movements of the elements in their correctly-timed relationship.10n2.3.2 Knitting cams 针织三角针织三角Two arrangements exist:(a)Revolving cylinder machines/针筒转动针织机针筒转动针织机(b)Reciprocating cam-carriage flat machines/三角座移动横机三角座移动横机 or rotating cam-box circular machines/三角座转动圆机三角座转动圆机

6、11n2.3.2 Knitting cams 针织三角针织三角cam-plate/三角座三角座,三角底板三角底板raising cam (clearing cam)/起针三角起针三角,退圈三角退圈三角stitch cam/成圈三角成圈三角upthrow cam/回针三角回针三角knock-over cam/脱圈三角脱圈三角guard cams/护针三角护针三角12bolt cam/进出三角进出三角132.4 The three methods of forming yarn into needle loops By sinking the yarn into the space between adjacent needles using loop forming sinkers or other elements which approach from the beard side.14 By causing latch needles to draw their own needle loops/圈干圈干 down through the old loops as they descend, one at a time, down the stitch cam.15 By causing a warp yarn guide to wrap the yarn loop ar