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1. WO2013154427 - APPARATUS FOR WEIGHING SLAUGHTERHOUSE PRODUCTS AND METHOD FOR USING THE SAME

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[ EN ]

CLAIMS

1 . A device for weighing slaughter products, comprising conveying means for conveying the slaughter products, the conveying means comprising a frame, two pulley means which are connected to the frame a fixed distance apart, being rotatable about two respective first vertical axes of rotation, an endless flexible conveying element which is passed over the two pulley means, which conveying element extends along a rectilinear weighing path between the two pulley means, a guide extending along a conveying path, hooks for the slaughter products, which hooks are connected to the conveying element at regular intervals and which are each provided with a guide elements for guiding cooperation with the guide, weighing means for weighing slaughter products that are present within the weighing section, reducing means for reducing tensile stress in the conveying element insofar as it extends in the weighing section, said reducing means comprising transmission means that are operative between the two pulley means, characterised in that the transmission means comprise a gear transmission with at least two meshing gears which are rotatable about respective second vertical axes of rotation, wherein the second axis of rotation of one of the at least two gears is in line with a first vertical axis of rotation, and wherein the second axis of rotation of another of the at least two gears is in line with the other first vertical axis of rotation.

2. A device according to claim 1 , characterised in that the gear transmission comprises at least three successive gears, wherein the second axes of rotation of the outer gears are aligned with the respective first axes of rotation.

3. A device according to claim 1 or 2, characterised in that the teeth of gears of the gear transmission have an oblique orientation.

4. A device according to claim 1 , 2 or 3, characterised in that gears of the gear transmission are provided in pairs, wherein the gears of a pair of gears have a common second axis of rotation.

5. A device according to claim 3 and according to claim 4, characterised in that the teeth of gears of a pair of gears are oriented mirror-symmetrically relative to a plane of symmetry that extends perpendicularly to the common axis of rotation.

6. A device according to claim 4 or 5, characterised in that the gears of a pair of gears are rigidly connected.

7. A device according to claim 4, 5 or 6, characterised in that the teeth of the gears of a pair of gears have the same pitch, with the teeth of the gears of a pair of gears are staggered over a half-pitch distance relative to each other.

8. A device according to any one of the preceding claims, characterised in that the device is provided with tie rods for suspending the frame.

9. A device according to any one of the preceding claims, characterised in that the weighing means comprise a vertically movable weighing part of the guide as well as a weighing unit for determining the weight load to which the weighing part is subjected.

10. A device according to claim 9, characterised in that the weighing part is provided with a vibration sensor for measuring external vibrations acting on the weighing part.

1 1 . A device according to claim 10, characterised in that the vibration sensor comprises a further weighing unit.

12. A device according to claim 10 or 1 1 , characterised in that the frame is provided with two girders, via the two ends of which the frame is connected to the environment, wherein the girders have a lower bending stiffness in vertical direction than in horizontal direction.

13. A device according to claim 12, characterised in that the bending stiffness of the girders in horizontal direction is at least two times, more preferably at least five times, higher than the bending stiffness of the girders in vertical direction.

14. A device according to any one of claims 9 - 13, characterised in that the weighing means comprise a start sensor for detecting the arrival of a hook on the weighing part

15. A device according to claim 14, characterised in that the weighing means comprise an end sensor for detecting a hook on the weighing part downstream of the start sensor.

16. A device according to any one of claims 9 - 15, characterised in that the weighing means comprise a file with the tare weight of each of the hooks acting on the weighing part during passage of the respective hooks without a slaughter product being suspended therefrom

17. A device according to any one of the preceding claims, characterised in that the conveying element comprises a link chain with vertically oriented links and horizontally oriented links interconnected in a regular pattern, and at least one pulley means is circumferentially provided with teeth arranged in pairs, each pair comprising an upper tooth and a lower tooth disposed directly opposite each other, wherein a gap is present between the teeth of a pair of teeth, into which gap horizontally oriented links extend at least partially, and wherein vertically oriented links are provided between the four teeth associated with two adjacent pairs of teeth, which links circumferentially abut against the flanks of said four teeth.

18. A device according to claim 17, characterised in that the teeth are conical in shape, seen in top plan view.

19. A device according to claim 17 or 18, characterised in that the upper teeth have the shape of a downward-facing cone, preferably a truncated cone, seen in cross-sectional view, and/or the lower teeth have the shape of an upward-facing cone, preferably a truncated cone, seen in cross-sectional view.

20. A device according to any one of the preceding claims, characterised in that the conveying element comprises a link chain with vertically oriented links and horizontally oriented links interconnected in a regular pattern, and wherein at least the most downstream pulley means is circumferentially provided with teeth, wherein the conveying means comprise a guide on the circumference of the most downstream pulley means for pushing the link chain in the direction of the teeth.

21. A device according to any one of the preceding claims, characterised in that the conveying element comprises a link chain with vertically oriented links and horizontally oriented links interconnected in a regular pattern, and at least the most downstream pulley means is circumferentially provided with teeth and, between adjacent teeth, at the bottom side thereof, with guide surfaces for guiding vertically oriented links of the link chain radially inward.

22. A device according to claim 21 , characterised in that the guide surfaces are inclined in radially inward direction.

23. A method for using a device according to claim 16, characterised by - determining the gross weight acting on the weighing part with the aid of the weighing means while a hook from which a slaughter product is suspended moves along the weighing part,

- deducting the tare weight associated with the hook as stored in the file from the gross weight so as to obtain the net weight of the slaughter product.

24. A method according to claim 23, characterised by

- determining the tare weight of a number of empty hooks with the aid of the weighing means

- comparing the tare weights as determined with the tare weights of the hooks in question as stored in the file, and

- if it appears from said comparison that a similar difference occurs between the tare weights as determined and the tare weights as stored in the file, correcting the tare weights as stored in the file in accordance with said similar difference.

25. A method according to claim 23 or 24, characterised by

- determining the tare weight of an empty hook a number of times with the aid of the weighing means,

- determining the average of the tare weights as determined,

- comparing the average tale weight as determined with the tare weight for the book in question as stored in the file, and

- if it appears from the comparison that a difference occurs between the average tare weight as determined and the tare weight as stored in the file, correcting the tare weight stored in the file in accordance with said difference.