Method of cutting a slaughtered bird from vent to breast

FIG. 1 shows a number of frames 7 to 12 inclusive of which the frames 10 and 12, provided with guideways, are stationary and the frame 7 to 9 inclusive and 11 rotate jointly around the shaft 1. The frames 9 and 11 support an operating unit 13, the rod 14 of which is driven both rotatably and vertically by driving means, not shown, while holding at its lower extremity the round cutting knife 15 with the guide pin 16. This known combination of cutting knife 15 and the guide pin 16 serves to make a round cut around the arse from where the cut directed toward the breast point is to be made. During this treatment the bird is secured in position between the fixed detent 17 and the movable detent 18 which can turn around the pin 19 and whose driving cam 20 co-operates with the curved track 12a.

United States Patent: 4339849