Coil material feeding apparatus

Abstract

In a coil material feeding apparatus which has a reduced bouncing in spite of a high speed operation, and can lower the load of the intermittent feeding apparatus, and can shorten the line length of the press stamping line, a position sensor for detecting a loop amount of a coil material and a coil material feeding portion are provided; the coil material feeding portion is provided with feeding rollers and a material correcting portion, and a mounting angle of the coil material feeding portion can be changed in correspondence to a thickness of the coil material and the like.

What is claimed is:  
     
         1 . A coil material feeding apparatus for feeding a coil material to an intermittent feeding apparatus of a mechanical press, comprising: 
 a coil material feeding portion including a pair of feeding rollers arranged on an upstream side of a material inlet in the intermittent feeding apparatus and feeding the material to the intermittent feeding apparatus while forming a proper loop in the material, a servo motor driving said feeding rollers, a material correcting portion structured such that upper and lower roller lines having a plurality of rollers respectively arranged approximately in a line and at alternately shifted positions in an advicing direction allow the coil material fed toward the intermittent feeding apparatus to pass through a gap between the upper and lower roller lines, and placed on an upstream side or a downstream side of said feeding rollers, and a height adjusting mechanism adjusting a distance of the gap between the upper and lower roller lines in said material correcting portion;    a position sensor provided on a downstream side of said coil material feeding portion and detecting a loop amount of said coil material;    a control apparatus controlling said servo motor on the basis of a signal output from said position sensor so as to control a feeding amount of the coil material by said feeding rollers; and    a stand holding said coil material feeding portion in a state in which a mounting angle of the coil material feeding portion is adjustable in such a manner as to change a feeding angle of the material in correspondence to a condition.    
     
     
         2 . A coil material feeding apparatus as claimed in  claim 1 , wherein said roller line is constituted of said feeding rollers serving as a pair of large-diameter rollers for powerfully extruding the material by a high torque, and a plurality of small-diameter roller lines repeating a small deflection and expansion for correcting the material.  
     
     
         3 . A coil material feeding apparatus as claimed in  claim 2 , wherein said large-diameter feeding rollers and said small-diameter roller line are independently provided with respective distance adjusting mechanisms.  
     
     
         4 . A coil material feeding apparatus as claimed in  claim 2 , wherein the rotation driving for said large-diameter feeding roller is transmitted to the small-diameter roller line, whereby a rotation of the small-diameter roller line is obtained.  
     
     
         5 . A coil material feeding apparatus as claimed in  claim 3 , wherein the rotation driving for said large-diameter feeding roller is transmitted to the small diameter roller line, whereby a rotation of the small-diameter roller line is obtained.