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Plant Guide: Power Press

Typical power press plant and equipment found in industry, including detailed images and the applicable UK legislation for each item.

Appropriate Legislation - PUWER
Appropriate Legislation - PUWER
Appropriate Legislation - PUWER
Appropriate Legislation - PUWER
Appropriate Legislation - PUWER

It is not usual for hydraulic presses to be fitted with fixed guards as this type of press is normally used for second operation work. Fixed guards are fitted in combination with some form of component feed system, such as a rotary table.

Appropriate Legislation - PUWER

Interlocking guards fitted to hydraulic presses take one of two forms. On the smaller presses, the guards form a complete screen around the tool area and operate up and down on a pantograph system, the pivot normally being the ram operating valve. This valve is set so that the guard has to be closed before the ram descends and should the guard open during a stroke, the ram stops and returns to it's starting position. The second type of guard system fitted to the larger presses takes the form of a rising screen at the front. This again, operates the ram operating valve, either directly or indirectly. The sides of the tool area in this type are protected by fixed guarding. Certain types of hydraulic presses allow the ram to complete a whole stroke once the operating pedal is activated but require some form of "hold closed" device on the interlocking guard gate.

Appropriate Legislation - PUWER

Appropriate Legislation: PUWER

Pneumatic presses are very similar in style to hydraulic presses, but are manufactured with smaller capacities. They normally use a rise and fall interlocking guard working as a pantograph lever system.

Appropriate Legislation - PUWER

An automatic guard has members that move outwards as the press ram descends, moving the operator bodily away from the trapping area. The sides of the press are protected by fixed guarding. Presses using this type of guard have to meet special criteria. Such guards are normally only found on presses with a capacity range of 150 to 4000 tons, and are usually of the straight through type with automatic guards fitted at the front and rear.

Appropriate Legislation - PUWER

Presses fitted with fixed guards range from the smallest 'bench' type press of ½ ton capacity up to presses of around 4,000 tons capacity.

Appropriate Legislation - PUWER

Presses utilising "enclosed tools" as the safety feature normally employ several tools which are capable of being set on an individual machine. These presses range in capacity from 5 to 100 tons.

Appropriate Legislation - PUWER

Interlocking guards are used when production procedures require the press operator’s hand to enter the tool area after each stroke to extract or introduce a component to the tool. The guard is equipped with an opening gate which is interlocked into the operation of the clutch. This gate can take two forms, on smaller presses, it is horizontally hinged, and on larger presses, it is normally a rise and fall type. Smaller presses in this category are normally fitted with one interlocking guard at the front, but larger presses can also be fitted with one at the rear. Press capacities can range from 5 to 4000 tons.

Appropriate Legislation - PUWER

A distance bar trip guard incorporates a bar, with a screen to prevent access to the tools from underneath. The bar/screen is pulled out to a safe set distance by the operator and has to be at that distance before the clutch of the press brake will operate. This bar is either locked in this position for the duration of the stroke or arranged so that any movement of the bar towards the tools stops the ram of the press brake from descending. The sides and the rear of the press brakes fitted with this type of device are protected with fixed guards.

Appropriate Legislation - PUWER

A photo-electric guard utilises a light curtain (photo-electric) across the front of the press which is sensitive to a hand or body movement. If this "curtain" of light is broken it acts as a switch and prevents the operation of the tool. The remaining sides of the press are protected by fixed guards.

At the periodic examination the response time (stopping time) needs to be checked in accordance with HSG180 for post '98 machines or PM41 for pre '98 machines.

Appropriate Legislation - PUWER

Appropriate Legislation - PUWER

These machines are manufactured to provide the full sheering, cropping, notching and punching service on angle iron, tee iron and channel iron. All these operations are provided by the one machine and are used for short production runs in fabrication shops. They embody a flywheel and clutch mechanism.

Appropriate Legislation - PUWER

These machines are similar in operation to a horizontal injection moulding machine, but operate in a vertical plane.

Appropriate Legislation - PUWER

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