推荐回答(5个)
一天,我无意中发现外婆家的储藏室里有一件用黑布盖着的凹凸不平的东西。我好奇地把布揭开,原来是一台缝纫机。
缝纫机有些地方已经生锈了,但是机器旁边放着一些崭新的布料,还有线和剪刀。难道外婆还在用这台机器吗?这台机器是怎么用的?正想着,外婆来了,我迫不及待地向外婆抛出一个个问题。外婆说:“这台机器我一直在用,你的那件新睡衣就是用它缝的。你看,机器下面像汽车刹车板的东西是缝纫机的动力板,然后把脚放在上面轻轻踩动就能让缝纫机运转了。”“缝纫机是怎么缝衣服的?”我好奇地问。外婆说:“你细心看,缝纫机上下各有一条线,而下面的线梭藏在缝纫机的肚子里,只要缝纫机一转动,上面的缝纫针就能把肚子里的线带上来,这样就能缝衣服了。”外婆把缝纫机搬出来,边说边操作给我看。没一会工夫,外婆就缝好了一件小肚兜,既漂亮又结实,好看极了!
外婆告诉我,在以前那个物资匮乏的年代,新三年,旧三年,缝缝补补又三年,缝纫机就是家里的宝,谁家有这样一台机器是很令人羡慕的。听了外婆的话,我觉得过去的生活真是不容易,我们应该好好珍惜现在的幸福生活。
缝纫机,普普通通,并无什么特别炫彩的地方。只知道任劳任怨地工作。
我们家就有两台“缝纫机”,一台是小缝纫机,奶奶常常用它做一些缝改衣服之类的活。所以缝纫机好听的“咔嚓咔嚓”声时常在我的耳畔响起。
另一台“缝纫机”,就是奶奶。为什么这么说呢?因为奶奶就像缝纫机一样任劳任怨。她也如缝纫机一样相貌平平,但她的爱却是不平凡的。
一、挑线机构 take-up mechanism
缝纫机在缝纫时,在形成线迹的过程中,起着输送、回收针线并收紧线迹作用的机构。主要可分为如下:
1、凸轮挑线机构:由凸轮带动挑线杆运动的机构
2、连杆挑线机构:由四连杆机构带动挑线机构运动的机构
3、滑杆挑线机构:由曲柄滑杆机构带动挑线机构运动的机构
4、旋转挑线机构:由一个或者两个装有挑线销的圆盘或其他形状的构件,一旋转运动进行挑线运动的机构
5、针杆挑线机构:由固定针杆上的过线或夹线装置,或直接固定装于针杆的挑线杆的机构。
二、送料机构 feeding mechanism
缝纫机在缝纫时,进行递送缝料的机构。其分类为:顺向送料机构;倒向送料机构;横向送料机构;下送料机构;上送料机构;针送料机构;上、下复合送料机构;上、针复合送料机构;针、下复合送料机构;上、针、下综合送料机构;差动送料机构;滚轮送料机构。
三、勾线机构 thread hooking mechanism
缝纫机在缝纫时,由机针带引缝线穿过缝料形成的线环后,一个勾住这个线环使之形成线迹的机构。其分类主要有:旋转勾线机构;旋梭勾线机构;旋转旋梭勾线机构;摆动勾线机构;摆梭勾线机构;弯针勾线机构;线钩勾线机构,叉针勾线机构。
四、挑线杆行程 take-up lever stroke
挑线杆上的穿线孔在运动一个周期中的两个极限之间的距离
五、针杆行程 needle bar stroke
针杆上某一点在针杆运动两个极限位置之间的距离
六、缝纫速度 sewing speed
缝纫机每分钟针刺的次数,单位为:针/min ,最高缝纫速度:缝纫机在正常缝纫条件下,能承受的最高针刺次数;工作缝纫速度:缝纫机在正常缝纫条件下,能承受持续安全操作的最高缝纫速度。
七、缝线 thread
缝纫用的线。一般由棉线、化纤线、金属丝等。主要分类有:针线;梭线;弯针线;绷线;覆盖线
八、线迹 stich
缝纫机机针在每次次过缝料时,由一根或多根缝线,自连、互相或交织在缝料上形成的一个单元。
普通家用缝纫机就可以,把机针换成16#或18#,用锦纶线就可以做。试试看。
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