This displaceable frame member 17 is interconnected at opposed ends thereof on a support guide block 37 which is secured to a respective one of opposed parallel guide rods 40 and displaced thereon by drive means in {HEAD ~ the form} of {TAIL ~ a link belt} 41 driven by suitable motor means  
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This displaceable frame member 17 is interconnected at opposed ends thereof on a support guide block 37 which is secured to a respective one of opposed parallel guide rods 40 and displaced thereon by drive means in { HEAD ~ the form } of { TAIL ~ a link belt } 41 driven by suitable motor means
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