Safety Devices

FATA Automation has manufactured Power and Free Chain Conveyor Systems for many years. FATA Automation has hundreds of systems installed across the world serving many industries. The Power and Free Conveyor System can deal with all required equipment movements, stopping, accumulating, lifting, lowering, transferring, switching path and storing.

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Uphill Safety Device

This device is used on long uphill sections to stop and con­trol any carriers that may be freed by the accidental breakage or uncoupling of the chain. The device acts directly on the power trolley wheels, raising it above them as they pass and returning in position immediately after. It consists of a strong sheet-metal bracket, hinged on a sup­port welded onto the  I beam. An internal rubber gasket prevents noise caused by constant operation.

In the event of chain breakage, the trolleys tend to slide down in the opposite direction to conveyor travel. These trol­leys however find their way blocked by the safety device.

Downhill Safety Device

This device is used on all downhill sections to stop and con­trol any carriers released by accidental breakage or uncoupling of the chain. It acts directly on the power trolley wheels.

It consists mainly of:

• A support for the various levers, electrowelded to the I beam 
• A rocking lever fitted with an adjusting screw hinged to the support 
• An intermediate lever hinged to the support
• A stop lever hinged to the support.

In its normal position, the device is as follows:

• The stop lever is maintained in a raised position by the intermediate lever which is fitted into a suitable notch found at the end of the stop lever
• The lower part of the rocking lever receives an impact from the power trolley wheels, which run beneath it.

The impact causes the lever to rotate (adjustable by means of the adjustment screw) and consequently it moves towards the intermediate lever. If chain speed is normal, the rocking lever, after moving closer to the intermediate lever, returns to its original position without touching the latter.

In the case of a chain breakage, the following will occur:

• The trolleys tend to slide down at higher speeds than normal 
• Because of this increased speed, the impact of the trolleys on the rocking lever causes a more pronounced rotation and subsequent bumping against the intermediate lever
• In bumping into the intermediate lever, the rocking lever causes this to disengage and thus lowering of the stop lever

The lowered stop lever blocks the leading wheel of the next oncoming trolley and at the same time releases a limit switch, which causes the chain drive to stop.

Anti-Runback Device

This device is installed at all points where it is necessary to prevent carriers from rolling backwards when disengaged from the power chain i.e. at stops, and accumulation sections and during transfer from one chain to another etc.

The unit includes:

• a support bracket welded to the side of the channel track dur­ing conveyor assembly; this bracket has two pins which support parts (2) and (5)
• an arm (2) that oscillates around the vertical pin of the bracket (1) which swings into position behind the carrier thus preventing it from rolling backwards 
• a counterweight (5) which acts on the cylindrical projection of the arm (2) to return it on to the working position after the BR carrier has passed through.

Indexing Device

The indexing device is used for special cycles where the various loads transported by the carrier must be routed, or when it is necessary to carry out differing work cycles. The indexing device consists of a 6 pole motor connected with a worm screw. A block sliding on the worm screw operates the micro switches which are placed along the axis of the screw at a constant pitch, in the same number as the selector pins. A cam fitted to the block operates the carrier mobile pins as the carrier passes.