APPARATUS FOR THE AUTOMATIC STUNNING OF SLAUGHTER CATTLE

Abstract: The invention relates to an apparatus for the automatic electric stunning of slaughter cattle, in particular pigs, by making use of two electrodes (3,4) placed next to each other in the V-shaped passage (7) formed between two endless conveyors (1,2) which electrodes according to the invention are suspended from a transverse shaft (6) placed high above the conveyors so that the electrodes like a pendulum (5) can be pushed aside in the direction of transportation by the animal to be stunned and return into the vertical starting position by gravity, said electrodes being arranged prefer­ ably close to the exit of the conveyors with the receiving surface (10) sufficiently low to make sure that a stunned animal does not prevent the return of the electrodes.

Description: Apparatus for the automatic stunning of slaughter cattle. The present invention relates to an apparatus for the automatic electric stunning of slaughter cattle, in particular pigs, comprising two endless conveyors having their operative surfaces arranged with respect to each other such that a V-shaped passage is formed and running in synchronism and parallel to each other and further comprising two electrodes insulated with respect to each other and extending into the V-shaped passage from above in a position next to each other, said electrodes being swingable about a horizontal transverse axis mounted above the conveyors. An apparatus of this type is known from the published Dutch Patent Application 7904935. According to said prior proposal the electrodes are swingably mounted upon horizontal transverse axes in a carriage which can be moved in the longitudinal direction of the conveyors which electrodes are held in position by springs and can be moved against said springs by the stunned animal which springs are combined with dampers to ensure proper contact between the electrodes and the head of the animal. The carriage starts its movement as soon as a sensing current between the electrodes establishes the presence of the correct animal so that during the passage of the stunning current relative movements between electrodes and animal's head are avoided. This known apparatus has an excellent performance and is able to stun a great number of animals per hour without any insufficient stunning or damage of the meat. This known apparatus, however, is rather complicated and expensive to manufacture. Purpose of the invention is to provide an apparatus which can be manufactured in a very simple way. According to the invention this purpose is achieved in that the electrodes in the manner of a pendulum are suspended from a transverse axis placed high above the conveyors. According to the present invention the animal the head of which comes into contact with the electrodes will move the electrodes, which electrodes now only give way against their gravity component derived from the weight of the entire pendulum. Due to the great length of the pendulum the position of the electrodes during the stunning time hardly changes its position with respect to the animal's head so that proper stunning can take place due to the time that the electrodes rest against the animal's head. Preferably the two electrodes together are positioned at an angle with respect to each other as to form a V pointing in the direction of movement. The pendulum should have a length of at least two meters calculated from the centre of the electrodes towards the axis at the top of the pendulum. Preferably said pendulum cooperates with an end switch interrupting the current supply to the electrodes before said electrodes leave the outer end of the V-shaped passage. This is necessary to avoid that there exists tension between the electrodes as soon as they start to move over the body of the stunned animal as well as to avoid contact with personnel outside the restrainer formed by the conveyors. Preferably the electrodes in the vertical starting position of the pendulum are present in a transverse plane lying closely in front of the transverse plane through the axes of the reversing wheels of the conveyors with the lower edges of the conveyors at the outer end above a receiving surface with a distance of at least 65 cm. The position of the electrodes close to the exit end of the conveyor with the receiving surface at such a lower level that the stunned animal falls down sufficiently to free the V-shaped passage, ensures that the electrodes with a minimal swinging angle permit that the electrodes can return readily into the vertical starting position to meet the next animal. Further undesired contact of the electrodes with the other parts of the animal is avoided. The invention now will be further elucidated with reference to the drawings. Fig. 1 is a side-view partly cross-section according to the line I-I of fig. 2 of the apparatus according to the invention. Fig. 2 is a front view of the apparatus of fig. 1. The apparatus shown in the drawings has two endless conveyors 1 and 2 one of which only being shown in fig. 1 Said two conveyors form a so-called restrainer holding the animal to be stunned at its belly. The two electrodes are indicated with 3 and 4 and they are rigidly attached to a frame 5 forming a pendulum which is free swingably suspended from a transverse axis 6 located at a high level above the conveyors 1 and 2. This frame 5can have a length of two meters or more. As shown in Fig. 1 the electrodes in their vertical starting position can lie in a plane 8 which is close to the plane 9 through the axes of the reversing wheels of the two conveyors 1 and 2. An animal stunned will move the electrodes to the left and after the stunning the animal will fall out of the exit of the conveyors and upon the receiving surface 10. The V-shaped passage in this way is immediately free from the stunned animal and the pendulum 5 with electrodes 3 and 4 can return immediately into the position shown in Fig. 1 without unnecessary contact with the animal and in time to stun the next animal. The pendulum 5 may cooperate with a switch nowt shown but operated when the pendulum passes the position indicated with the interrupted line 11. This switch can be made such that upon return of the pendulum from the position shown with line 12 towards the in full lines shown starting position the electrodes are put under electric tension again. The apparatus according to the invention is of a very simple construction.

Claims: CLAIMS 1. Apparatus for the automatic electric stunning of slaughter cattle, in particular pigs, comprising two endless conveyors having their operative surfaces arranged with respect to each other such that a V-shaped passage is formed and running in synchronism and parallel to each other and further comprising two electrodes insulated with respect to each other and extending into the Vshaped passage from above in a position next to each other, said electrodes being swingable about a horizontal transverse axis mounted above the conveyors, c h a r a c t e r i z e d in that the electrodes (3,4) in the manner of a pendulum (5) are suspended from a transverse axis (6) placed high above the conveyors (1,2). 2. Apparatus according to claim 1, c h a r a c t e r i z e d in that the pendulum co-operates with an end switch which interrupts the current supply to the electrodes (3,4) prior to the electrodes leaving the outer end of the V-shaped passage (7). 3. Apparatus according to claim 1 or 2, c h a r a c t e ri z e d in that the electrodes in the vertical starting position of the pendulum (5) are in a transverse plane (8) which is located closely in front of the transverse plane (9) through the axes of the reversing wheels (1,2) of the conveyors at the outlet end of the conveyors, the lower edge of said conveyors at said outer end lying above a receiving surface (10) with a distance of at least 65 cm.

Inventors: GOOSSENS, JAN BAPTIST ROBERT
Applicants: MACHINEFABRIEK G.J. NIJHUIS B.V.
Application year: 1982
Main classification: A22B3
IPC codes: A22B3