Document LeL8KZBBy9aN7Gy5NaNzQNzd

COLD FORMING OF METALS Fig 23-17. There are advantages to indining a press The guard Is simple and economical to make This operation (form ing pail covers) also permits automatic gravity feed direct from blanking opera tion (via the belt conveyor) This |ob could also be hand fed. Courtesy United States Steel Corp make changes in the adjustments without the supervisor's approval Adjustable bamer devices are available commercially or may be made in the plant They are attached to the frame of the press and have front and side sections which can be adjusted for dies of almost any size This type of device is usually constructed of rod stock or perforated metal The pivot ing or sliding sections should be interlocked with the press control for maximum safety. Unless ejection is automatic, it may be necessary to leave an opening in the bar rier for insertion of a tool to remove the piece from the die This opening should not be wide enough for a hand or finger to ex tend into the danger zone (Fig 23-19). Gate or movable bamer devices These devices are designed to enclose the point of operation completely before the clutch can be engaged. The clutch Is tripped by part of the gate or bamer mechanism during the last % m. of travel, or at whatever predetermined height is set If the fingers or hand or any other obstruction % m or more m height is in the pomt-of-operation area, the gate would take some tune to complete or its provision is considered functionally imprac ticable, or both, an adjustable barrier de vice can be provided on each press This type of device can be used on many, opera tions to prevent the operator's hands from entering the point-of-opeTation zone (Fig 23-18) The adjustable bamer device requires ad justment for each job or die setup and is not usually interlocked with the press con trol Die setters should be instructed to follow the dimensions for permissible open ings given m Table 23-A when adjusting the sections of this type of guarding device The operator should never be allowed to 28-14