Document EqVGLj4L4YN4g51jjjqgEd150

Fic 29-10 --Different designs for a roll nip guard where feeding over or under a guard with 5a-in opening is desired Fic 29-11 --Different de signs (shown in outline) for a good guard on a roll nip with a feed table shifted accordingly ) To design a properly placed barrier guard fitted with an opening for passage of stock, the following procedure is suggested 1 Draw a full-scale outline of the nip zone with the stock travel line accurately shown Indicate the clearance line on both rolls If more than a %-in clearance is required between the edges of the guard and the rolls, the edges of the guard should be located m accordance with the safe open ing layout shown in Fig 29-9 for layout on a roll surface 2. Determine distance S--the distance from the vertical line of the rolls to a point where a 'Mo-in vertical space exists on each side of the travel line of the stock (total nip At this point, begin the layout of the di mensions shown centered on the travel line m Fig 29-5 Outline the guard sections, giving the required opening between sec tions (One edge of each section will touch a clearance line, the other will touch the safe opening layout at the proper point to give the required opening ) Determine the necessary dimensions for properly lo cating the guard from this final layout. The width of the guard sections can also be determined 4 Before the guard is put in operation, check carefully for hand travel under the guard, stability of mounting, and rigidity of con struction 80S