本文主要介绍便签本印刷机的印刷机的上摆式递纸装置

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图4-25所示为PZ4880-01型对开四色平版印刷机上采用的下摆式递纸装置的工作原理及其结构.

凸轮1为递纸凸轮凸轮2为复位凸轮,它们都安装在前传纸滚筒操作面外側.

这两个凸轮又叫等距离共扼凸轮,递纸凸轮1使递纸摆臂在牙台上取纸后加速,当与前传纸滚筒相切时速度正好与前传纸滚筒表面速度相等,

于是将便签本纸张交给前传纸滚筒(中心为O3)叼牙.递纸摆继续等减速下摆,当摆臂速度为零时,摆臂返回.

摆臂返回程的动力靠复位凸轮,复位摆臂3和递纸摆臂4靠拉力弹簧5连接成一体.

拉力弹簧钢丝直径为8mm,工作拉力约250kg,用弹簧拉力来克服惯性力.由于共扼凸轮曲线的原因,

拉力弹簧理论上是不伸长也不缩短的.递纸摆臂沿O2中心固定摆动,叼牙运动轨迹为一定中心弧线,

摆臂运动轨迹比上摆式递纸牙简单,精度更易保证摆臂在牙台取纸(闭牙)时,要求有一段时间速度为零.

闭牙后开始向前传纸滚筒摆去,摆臂速度为等加速,当摆臂与前传纸滚筒叼牙交接前后,

摆臂与前传纸滚筒的旋转速度应等速即等速区,在等速区两牙同时叼着纸,共同走1~3mm,否则套印不准.

叼牙交接后,摆臂由于惯性继续下摆直至零速,由于摆臂向回摆在前传纸滚筒连心线上时,前传纸滚筒正好在筒身面上.

前传纸滚筒必须是偏心的,否则摆臂叼牙就碰到筒身,所以PZ4880-01型对开四色平版印刷机前传纸滚筒轴头与筒身偏心距3mm,

即当摆臂回摆时摆臂叼牙与前传纸滚筒筒身面间隙约加大6mm虽然间隙加大,但被前传纸滚筒叼着的纸仍蹭着叼牙,

因此摆臂每个叼牙上有小滚轮,滚轮在便签本纸张上滚动,从而防止了将便签本纸张划伤.

4-25下摆式递纸装置

1,2一凸轮;3,4一摆臂;5弹簧

下摆式递纸是目前单张纸印刷机上采用非常普遍的一种方式.除了上述的北人印刷机外,国内外一些著名的印刷机,

如德国的海德堡CD102、罗兰700、高宝150、日本的三菱钻石3000型印刷机上以及国产的其他一些高速机也采用这种下摆式递纸装置,工作原理也基本                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      相同.

图4-28递纸牙结构

1一牙垫;2一递纸牙轴;3一晈牙;4,5一螺钉

6一牙箍;7一调节螺钉;8一撑簀;9一牙座;10一

定位摆块;11定位螺钉

递纸牙咬力的调节,必须在递纸牙牙垫高度调节正确的基础上进行,否则将因牙垫高度变化而影响咬力.咬力的调节步骤和方法如下.

①将机器转动到递纸牙咬纸位置,在图4-28中递纸牙轴的定位摆块10和定位螺钉11之间,垫入0.25mm厚的纸片.

の松开全部咬牙,通过图4-28中的紧固螺钉4,逐个调节,让咬牙靠住牙垫,并使其有一定压力,然后旋紧螺钉.

用0.1mm的牛皮纸夹入每个咬牙和牙垫之间,测试其咬力,一般掌握在稍微用力能拉动为宜.

③根据测试结果,按照从中间分向两边的顺序,在图4-28中用调节螺钉7逐个调节晈力,使全部递纸牙所咬牛皮纸的拉力大致相等.

并调节每个递纸牙上螺钉5与定位架平面的间隙,使递纸牙的张开时间一致.

撇去定位摆块和定位螺钉间的纸片.此时,由于大拉簧作用使定位摆块靠紧定位螺钉,

所有递纸牙上的撑簧8(如图4-28中)均随之增加相等的压缩量,即增加了相同的咬力,保证便签本纸张在传送过程中不发生移动.

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