Moveable Machine Guard Safety:
Meeting OSHA AND ANSI Requirements
OSHA requires safety guards to prevent inadvertent contact with most moving parts that are accessible in the normal course of operation.
OSHA defines machine safety by first recognizing that ALL machines consist of three fundamental areas:
- the point of operation,
- the power transmission device
- operating controls
Despite all machines having the same basic components, their safeguarding needs widely differ due to varying physical characteristics and operator involvement.
In many metalworking and other fabricating processes, machine guards are often required to protect workers against injury from hazardous points of operation.
Frequently, such guards must be opened to permit access to change tooling, load/unload material, clear jams, apply lubricant, and/or adjust process parameters.
To minimize the impact of movable guards on productivity, they are generally designed to be opened without the use of tools. Such ease of access dictates precautions be taken to protect the workers from exposure to hazards when the guards are open.
One commonly used precautionary technique is the use of interlock switches and sensors, which are intended to shut down the machine upon opening of the guard.
Traditionally, design engineers and plant operation personnel have interlocked movable guards with conventional position-presence-sensing devices.
1) Conventional non-safety limit switches.
2) Inductive proximity sensors.
3) Magnet or reed switches.
4) Joy plugs.
5) Snap-action position switches.
6) Hall-effect sensors.
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