POWER OPERATED CUTTING MACHINES FOR CUTTING TEXTILES, UPHOLSTERING MATERIALS, INSULATING MATERIALS, PAPER, LEATHER, IMPREGNATED MATERIALS, RUBBER, COATED MATERIALS, FIBROUS MATERIALS, FELTS, CELLULOSE MATERIALS, PLASTIC MATERIALS, SYNTHETIC MATERIALS, AND SIMILAR MATERIALS AND COMBINATIONS THEREOF; SPECIAL MACHINES FOR CUTTING SHEETS, WEBS, TEXTILES, AND SIMILAR MATERIAL; POWER CLUTCHES AND SHEET FEEDING MECHANISM FOR USE WITH CUTTING MACHINES AND FOR GENERAL APPLICATION AND PARTS THEREOF