['221', '(', '293', ')', 'TYPES', 'OF', 'DRAWING MACHINES', 'and', 'front rollers', 'is', 'a', 'problem', 'probably', 'changing', 'with', 'every', 'blend', 'being', 'treated.', 'With', 'the', 'present-day', 'possibilities', 'in', 'perfect', 'blend', 'analysis', ',', 'however', ',', 'it', 'should', 'be', 'possible', 'to', 'bring', 'this', '"', 'setting”', 'down', 'to', 'basic', 'prin-', 'ciples.', '(', 'c', ')', 'Delivery Mechanisms-Slivers', 'may', 'be', 'taken', 'from', 'worsted', 'drawing', 'boxes', 'under', 'four', 'conditions', ':', '-', 'I.', 'Perfectly', 'open', 'and', 'unconsolidated', ';', '2.', 'Twistless', 'but', 'consolidated', 'by', 'rubbing', ';', '3.', 'Lightly', 'twisted', ';', 'and', '4.', 'Heavily', 'twisted.', 'As', 'a', 'rule', 'it', 'is', 'found', 'necessary', 'even', 'with', 'compara-', 'tively', 'thick', 'slivers', 'to', 'consolidate', 'slightly', 'by', 'running', 'them', 'through', 'a', 'revolving funnel', 'or', 'over', 'slightly', 'con-', 'solidating', 'and', 'efficiently', 'delivering', 'guiding', 'plates.', 'Rubbing leathers', ',', 'however', ',', 'allow', 'the', 'consolidation', 'of', 'quite', 'fine', 'slivers', ',', 'say', ',', '1', 'or', '2', 'drams', 'per', '40', 'yd.-so', 'that', 'such', 'may', 'readily', 'be', 'wound', 'up', 'and', 'subsequently', 'deliv-', 'ered', 'into', 'the', 'back rollers', 'of', 'the', 'succeeding', 'box', 'as', 'already', 'described.', 'When', 'an', 'actual', 'twisting', 'of', 'the', 'sliver', 'is', 'required', 'as', 'in', '(', '3', ')', 'and', '(', '4', ')', ',', 'then', 'the', 'flyer', 'and', 'bobbin', 'system-the', 'old', 'flax wheel', 'spinning', 'system-may', 'be', 'resorted', 'to.', 'This', ',', 'as', 'already', 'implied', ',', 'necessitates-', '(', 'a', ')', 'Positive', 'drive', 'of', 'flyer', 'and', 'pull-round', 'of', 'bobbin', 'by', 'the', 'sliver', 'extending', 'from', 'the', 'flyer nozzle', 'to', 'the', 'bobbin', ';', 'this', 'necessitating', 'sufficient', 'twist', 'to', 'withstand', 'any', 'strain', 'which', 'may', 'arise', 'at', 'any', 'period', 'of', 'the', 'process', 'from', 'empty', 'to', 'full', 'bobbin', ';', 'and', '(', '6', ')', 'Positive', 'drive', 'of', 'both', 'flyer', 'and', 'bobbin', 'to', 'obviate', 'any', 'straining', 'of', 'the', 'slivers', ',', 'under', 'which', 'cir-', 'cumstances', 'condition', '(', '3', ')', 'is', 'readily', 'obtained.', '*', 'The', 'bobbin', 'being', 'slightly', 'retarded', 'by', 'washers.', '221']
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