A FISH PROCESSING MACHINE

Abstract: A fish processing machine for production of skinfree herring fillets, and incorporating at one hand a filleting device (9) comprising two circular knives (17) and on the other hand a deskinning device (25), which consists of rotatable pulleys (22, 26), equipped with grooves (23, 29) for a thin wire serving as a conveying member moving the fish to rotatable deskinning knives (27). The purpose is to provide a fully automatic fish processing machine, which treats the fish so cautious that also very thin-skinned fish can be filleted and skinned in a continuous sequence. This task has been solved in that the filleting device (9) is constituted by two circular knives (17) obliquely arranged at an acute angle relative to each other and a first guiding rail (15) located in front of said circular knives, the beheaded and tail-less fish (10) being slidingly conveyed upon its opened and gutted belly on said first guiding rail towards the area of the point of the angle of the circular knives, and in that tangentially to and behind the circular knives (17) of the filleting device (9) there is arranged a second guiding rail (21), situated at the extension of said first guiding rail (15) and designed to guide the double fillet without bones and spine and held together by the skin only, to the periphery of a first pulley (22) forming part of said deskinning device (25), and situated in the extension of the second guiding rail (21).

Description: A FISH PROCESSING MACHINE The present inevention relates to a fish processing machine for production of skinned fillets of fish, particularly herring, and incorporating at one hand a filleting device comprising two circular knives and on the other hand a deskinning device, which consists of rotatable pulleys, equipped with grooves for an endless pliable member, e.g. a thin wire arranged in an θ-shaped track, and serving as a conveyor for the fish up to one of said pulleys, which cooperates with rotatable deskinning knives. Background of the invention Automatic fish processing machines for whitefish, i.e. codfish, haddock, ling and the like are earlier known, in which the major part of the fish processing procedure (except for the introduction of a fish in the machine and the decapitation thereof) up to the skin free fillet is made continuously without manual grips having to be made. Whitefish is characterized thereby that it is rather big and firm-fleshed and has a very thick skin. It therefore stands rather harsh treatment such as subjected to in a machine which is described in Swedish patent specification 202.778, where the tail portion of the fish is squeezed between a V-belt and a V-belt pulley with the fish located transversly to the pulley. Along a portion of the circumference of the pulley there are arranged treatment stations through which the fish is pulled with aid of guiding plates. A first station produces an incision from the belly side towards the spine, whereupon ploughs are arranged for spreading apart the flanks of the fish. A second set of knives is arranged for cutting away the gut membranes and bones whereupon follows a further knife station for detachment of the flank portions along the spine till in the vicinity of the skin. A deskinning device of the type described hereabove is also connected to the circumference of the V-belt pulley. From earlier having been squeezed between the driving belt and the pulley, the double fillet, which is still held together by the skin, subsequently shall be conveyed in the plane of the pulley by aid of guiding members. Even if it concerns whitefish, which has a very thick skin the filleting machine operates without any bigger difficulties, but the transfer from this machine member to the deskinning device is however problematic, as the device is not entirely reliable. Fish having very thin skin, such as herring, will not stand the treatment caused them by these known filleting devices and if the herring furthermore is pretreated e.g. salted, seasoned or pickled it can not at all stand any rough treatment. Machines are earlier konwn which only has for purpose to deskin fish of some sort, whereby the filleted double fillet is placed manually upon a conveyor, which feeds the fish in correct position through the machine. The drawback with such a machine is however that it can not be connected to the filleting machine. Highly effective automatic filleting machines are known having a capacity which requires two deskinning machines, each being served by two persons. It has since long been a desire to be able to effect the deskinning by means of automatic transfer from the filleting machine without manual work after the fish has been fed into the machine. Purpose and most essential features of the invention The purpose of the present invention is to provide a fully automatic fish processing machine which treats the fish so cautious that also fish having very thin skin, such as e.g. small herring can be filleted and deskinned in one continuous sequence. This task has been solved thereby that the filleting device is constituted by two circular knives obliquely arranged at an acute angle relative to each other, and a first guiding rail located in front of said circular knives, the beheaded and tail-less fish being intended to be slidingly conveyed upon its opened and gutted belly on said first guiding rail towards the area of the point of the angle of the circular knives, and that there is arranged tangentially to and behind the circular knives of the filleting device a second guiding rail, situated at the extension of said first guiding rail and designed to guide the double fillet rid of the bones and spine and heled together by the skin only to the periphery of the first pulley when forms part of said deskinning device and is situated in the extension of the second guiding rail. Description of the drawings Fig. 1 shows very schematically and in side view a portion of the fish processing machine according to the invention. Fig. 2 shows the machine according to fig. 1 in a view from above. Fig. 3 shows in bigger scale a section along line 111-111 in fig. 1 with a fish located therein, and which is guided against a filleting device. Fig 4 shows a section along line IV-IV in fig. 1 with a fish placed therein during the filleting. Fig. 5 shows a section along line V-V in fig. 1 with a fish placed therein and moving out from the filleting device. Fig. 6 shows a view from above of a device for aligning the fish . Fig. 7 shows a section along line VII-VII in fig. 1 with the double fillet of the fish taking care of by the deskinning device. Fig. 8 shows a section along line VIII-VIII in fig. 1 with a fish on its way against the deskinning knives during the turning phase. Fig. 9 is a section along line IX-IX in fig. 1, showing the fish during the very deskinning operation. Description nf the embodiments The fish processing machine according to the invention preferably consists of known, reliable designs in as far as these are available. The fish processing machine thus incorporates and not further shown feeding table, on which the fishes 10 are oriented manually or automatically thus that they are all located with the head and the belly in the same direction. In the first station, which is neither shown, the head and tail are cut off whereupon the fishes fall down into a feeding gutter 7 and are conveyed between two endless conveyor belts 11 with the belly turned downwards to a gutting station 8 incorporating two horizontally arranged somewhat overlapeing circular knives 13 , which cut off a slice of the belly of the fish, thus that a following rinsing wheel 1 can take away the guts. The endless conveyor belts 11 convey the fishes 10 further to a filleting device 9, whereby in the opened fish belly is introduced a guiding rail 15, the opposite end of which is designed with an enlarged portion 16 mainly conforming to the space between two oblique circular knives 17, hereinafter called the filleting knives, which as shown in fig. 4 cut out the spine of the fish and the portions of the belly where gut membranes and bones projecting from the spine are located. By aid of a pressing device 18 the pressure on the knives 17 can be adjusted whereby it is ascertained that the filleting knives will not cut through the skin 19 of the fish. The cutting away of the spine 20 and bones of the fish is brought about within the area where the filleting knives 17 form an acute angle against each other, and further defined in the very point of the angle. During the entire filleting procedure the fish is guided, at the front of the filleting knives 17 by means of said front guiding rail 15 and on the rear side of the fillet knives, where the fish now consists of a double fillet, the fillet portions of which are interconnected via the dorsal skin, by means of a rearward guiding rail 21. This is V-shaped in cross section and is arranged very near to the filleting knives 17, where these form said point of the angle. In order to facilitate the transfer of the double fillet to the rear most guiding rail 21 this is at its front end beveled. The rearmost end of the guiding rail 21 is tangentially connected to a pulley 22 equipped with a circumferential groove 23 for an endless pliable member 24 arranged in a 8-shaped track, e.g. a very fine steel wire. The two endless conveyor belts 11 extend up to said pulleys 22, which means that the double fillet will be fed up to them. The V-shaped guiding rail 21 is formed in close contact to the circumferential portion of the pulley 22, thus that the double fillet will "ride straddled" upon the pulley and thereby also on the wire 24. The pulley 22 forms part of the deskinning device 25, the second bigger pulley of which in the 8-formed track is designated 26. Of importance at the transfer of the double fillet to the big pulley 26 has hitherto been the exact guided feeding of the dorsal fin of the fish in relation to the rather shallow groove 29 in the circumference of the big pulley 26, wherein the wire 24 is located. As the size as well as the position of the dorsal fin of the fishes vary, and also the location of the double fillet upon the wire 24 , the dorsal fin will urge the wire 24 out of the groove resulting in a break-down, if the fin is not exactly centered relative to the groove 29, or if it is so situated that it comes entirely outside the pulley. An exact guiding of the fin is howevere not possible, and the deskinning device 25 therefore must be so designed that it can tolerate deviations from the ideal feeding. This problem has been solved by aid of an additional pulley 28 provided in front of and very close to the big pulley 26 and which has for its primary purpose to prevent the wire from leaving the groove 29, even if it is exposed to a lateral force from the dorsal fin. The pulley 28 also assists in guiding the dorsal fin by giving the wire 24 a faint directional change in the plain of the pulleys 23,26,28, whereby is obtained that the dorsal fin of the fish is risen before the double fillet portion around the dorsal fin is squeezed between the wire 24 and the circumferential groove 29 of the big pulley 26. The guiding of the dorsal fin of the fish is effected by aid of a guiding device 30 consisting of a fork-like member 31, the fork teeth 32 of which are tapering and which catch the dorsal fin 33 when this projecting upwards thus that the dorsal fin will obtain its correct position in relation to the groove 29 of the big pulley 26. The guiding member 31 is pivotable about rearward shaft journals 34 and it is provided with a weight 35 which provides a certain pressure against the back of the fish. As mentioned above the dorsal portion of the double fillet will be squeezed between the wire 24 and the pulley 26, which means that half the fillet will hang verticall .downwards such as shown in fig. 7. About half of the circumference of the big pulley 26 is surrounded by a turning member 36, which at its lower end is formed by a vertically located guiding rail 37, which at higher level is shaped to a gutter 38, such as shown in fig. 8. The purpose of the gutter is to turn the fillet sides 10a and 10b of the double fillet thus that they at the upper part of the pulley 26 will be located with the skin side engaging the pulley 26. The two circular skinning knives 27 are arranged at such a short distance, one of each side of the pulley 26, which corresponds to the thickness of the skin such as shown in fig. 9. At the rearmost end of the gutter-shaped turning member 36 there are provided faintly elastic pressure members 40, which press the fillets 10a, 10b to engagement against the pulley 26. Below the deskinning knives 27 on both sides of the pulley 26, there is arranged a gutter 41 for the deskinned fillets, whereas on the down-moving portion of the wire 24 from the pulley 26 is arranged a scraping device 42 for the skin. The deskinning device 25 is further provided with a wire tensioning device 45, and between the pulleys 22 and 28 and just above the wire 24 is provided a level sensor 43. If the double fillet has been located in a wrong manner upon the wire, this is sensed as an unpermissible level change and an ejecting device 44 is activated to throw out the double fillet from the wire. The invention is not limited to the embodiment shown but a plurality of variations are possible within the scope of the appended claims. The inventive fish processing machine can also be used in a semi-automatic rinsing and filleting process for fish, which has been pretreated in an earlier stage and where only the filleting and deskinning shall take place.

Claims: CLAIMS 1. A fish processing machine for production of skinned fillets of fish, particularly herring, and incorporating on one hand a ^ filleting device (9) comprising two circular knives (17) obliquely arranged at an acute angle relative to each other and a first guiding rail (15) located in front of said circular knives, the beheaded and tail-less fish (10) being intended to be slidingly conveyed upon its opened and gutted belly on said first guiding rail towards the area of the point of the angle of the circular knives, and on the other hand a deskinning device (25), which consists of rotatable pulleys (22,26), equipped with grooves (23,29) for an endless pliable member (24), e.g. a thin wire which conveys the fish up to one of said pulleys (26) , which cooperates with rotatable deskinning knives (27), c h a r a c t e r i z e d t h e r e i n, tangentially to and behind the circular knives (17) of the filleting device (9) and in connection to its angle point there is provided a second guiding rail (21), situated at the extension of said first guiding rail (15) and designed to guide the double fillet rid of the bones and the spine and held together by the skin only to the periphery of first pulley (22) forming part of said deskinning device (25) , and situated in the extension of the second guding rail (21) , and that the fish (10) is intended to be conveyed through the filleting device (9) between mainly parallel portions of two endless parallel belts, arranged to extend to the said first pulley (22) of the deskinning device (23). 2. A fish processing machine as claimed in claim 1 , c h a r a c t e r i z e d t h e r e i n, that the second, or as seen in the direction of transport, the rearmost guiding rail (21) , at its foremost end portion being V-shaped adjacent the angle points of the oblique filleting knives (17) and at its rearmost end portion being shaped to close comformity with the circumferential portion of the first pulley (22) . 3. A fish processing machine as claimed in anyone of claims 1 or 2 , c h a r a c t e r i z e d t h e r e i n, that between the first and the second pulley (22,26) and in the same vertical plain there is arranged a third pulley (28), which is situated close to the second pulley (26) and arranged to give the pliable member (24), just before the second pulley (24), a change of direction in the same vertical plain. 4. A fish processing machine as claimed in claim 3, c h a r a c t e r i z e d t h e r e i n, that a fork-like guide member (30) is provided above the third pulley (28) and designed to guide the dorsal fin (33) of the fishes (10) against the circumferential groove (29) of the second pulley (26).

Inventors: LINDH PER-OLOF, LINDH, PER-OLOF
Applicants: SWEDEFISH MACHINERY AB
Application year: 1985
Main classification: A22C25
IPC codes: A22C25