The Meyn vent cutter has several unique features that assure an optimal cut while processing a wide weight range. Optimal positioning of the bird with regard to the vent knife prior to and during drilling ensures a perfect bird handling and makes sure that the birds are positioned in the best possible way. This is highly important in order to achieve the most optimal cut independent of the weight ranges that are processed.
Furthermore, a correct positioning of the bird virtually eliminates the risk of intestine damage due to miss cuts. This of course is highly important as otherwise the birds could be contaminated with faeces which unfavorably influences product hygiene. As the Meyn vent cutter uses a mechanical vent clamping device, no vacuum or compressed air is required, increasing the machines reliability.
The vent cutter is placed in a 180 degrees curve of the overhead conveyor, often as the first machine in the evisceration line, directly after the rehanger/hock cutter. Bleeded and defeathered birds are hanging in shackles of the overhead conveyor and are guided into the infeed section of the machine with the back of the birds towards the centre of the machine. Sets of static and spring loaded guides position the birds into the processing units of the vent cutter. The birds are held in position by the lower part of the processing unit, two side supports lift each bird and pushes it against a centering bracket placed between the legs of the bird.
Next, the drilling section of the processing unit is lowered onto the bird. First the centering cone enters the vent. A clamping bush, placed in the centre of the tube shaped vent knife, is lowered. The skin of the bird is clamped between centering cone and clamp bush and lifted a little. Next the rotating vent knife cuts the skin around the vent, thus releasing the vent from the rest of the bird.
Finally the bird is lowered again while the vent is still clamped in the drilling unit. This means that the intestines are pulled out over a length of about 100 mm. On release from the drilling unit, the vent is positioned over the back of the bird and the bird is released from the machine.
After each cycle, the drill unit is cleaned using a high pressure water jet.