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May 15, 2024

What Is a Pullback Device?

A safety device that uses cables attached to the arms, wrists and hands of the operator. It is used on mechanical power presses to help prevent hand injuries when the slide/ram of the press begins its downward motion. These devices allow the operator access to the point of operation when the slide/ram is up, but as soon as it starts to descend the cable automatically pulls the operator’s hands away from the point of operation and deactivates the machine. Pullouts should be properly adjusted before an operator shift, following a new die setup and when the operator is changed.

A device that uses a sensor to identify a person in the danger zone and either shuts down the machine or stops the conveyor belt or other control mechanism from operating. These can include presence-sensing devices, pullback or restraint straps, safety trip controls, two-hand controls and gates. Gates are movable barriers that are interlocked with the machine and keep operators from entering dangerous areas while the machine is in operation.

An operation that creates a hole in sheet metal stock with a punch-like action. A sheet metal shear is another type of punch that is similar in operation, but does not cut the stock as it shears the material and bends it.

The portion of the die in which a shear points is located that contacts and closes the workpiece after it has been pulled down on the die by the force of the closing punch. A shear point is also called a shear flange, a shear blade or a shear hook.

Any process that takes place on a workpiece before a cutting tool can engage the material. Setup includes preparing the workpiece for cutting, mounting a cutting tool, making adjustments and securing the workpiece to the machine. Setup also includes adjusting, calibrating and maintaining machines and equipment.