CA1117263A - Apparatus for skinning double fillets - Google Patents
Apparatus for skinning double filletsInfo
- Publication number
- CA1117263A CA1117263A CA000350014A CA350014A CA1117263A CA 1117263 A CA1117263 A CA 1117263A CA 000350014 A CA000350014 A CA 000350014A CA 350014 A CA350014 A CA 350014A CA 1117263 A CA1117263 A CA 1117263A
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- Canada
- Prior art keywords
- knives
- feed
- skinning
- gap
- edges
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
ABSTRACT OF THE DISCLOSURE:
An apparatus for skinning double fillets of, in particular, fat fish such as herrings, in which prior to the actual skinning a central portion containing the fin holders of the back fin edge and the fat strips on both sides of the latter are first cut away by means of a presevering device without separating the double fillet into individual fillets.
The double fillet is aligned and laid on a conveying surface and cut into on both sides of the said central portion to the region of the inner side of the skin. In continuation of these cuts the central portion is peeled free by means of gradually outwardly extending peeling edges. The thus prepared double fillet is skinned by means of a skinning machine of a known type situated directly downstream of the pre-severing device so that two individual fillets, the central portion containing the fat strips, and the skin are obtained separated.
An apparatus for skinning double fillets of, in particular, fat fish such as herrings, in which prior to the actual skinning a central portion containing the fin holders of the back fin edge and the fat strips on both sides of the latter are first cut away by means of a presevering device without separating the double fillet into individual fillets.
The double fillet is aligned and laid on a conveying surface and cut into on both sides of the said central portion to the region of the inner side of the skin. In continuation of these cuts the central portion is peeled free by means of gradually outwardly extending peeling edges. The thus prepared double fillet is skinned by means of a skinning machine of a known type situated directly downstream of the pre-severing device so that two individual fillets, the central portion containing the fat strips, and the skin are obtained separated.
Description
BACKGROUND OF THE INVENTION
1. Field of the invention The invention relates to an apparatus for skinning double fillets of fish, such as herrings, in particular herings in a spiced, marinated or salted state.
When skinning double fillets it is important to remove the extremely delicate skin from the fillets whilst avoiding patches of skin and at the same time ensuring that the fat strips sltuated under the skin on both sides of the fin holders for the back fins are removed undamaged Erom the fillets. The latter is desirable because there is otherwise generally the danger that during the skinning the fat of the fat strips is distributed over the skinned surface of the fillets which leads to an impairment of the quality of the latter.
1. Field of the invention The invention relates to an apparatus for skinning double fillets of fish, such as herrings, in particular herings in a spiced, marinated or salted state.
When skinning double fillets it is important to remove the extremely delicate skin from the fillets whilst avoiding patches of skin and at the same time ensuring that the fat strips sltuated under the skin on both sides of the fin holders for the back fins are removed undamaged Erom the fillets. The latter is desirable because there is otherwise generally the danger that during the skinning the fat of the fat strips is distributed over the skinned surface of the fillets which leads to an impairment of the quality of the latter.
2. Description of Prior Art An apparatus for skinning double fillets of fish is known from DE-AS 29 05 518, in which a pair of skinning knives with an opening between them and with cutting edges , ,/" '~ ~
2fi3 - extending outwardly in the manner of a plough from points situated adjacent the gap is associated with, and spaced a small distance away fxom a conveying surface transporting the double fillets on their skin s~de. Endless engagement belts rotating synchronously with the conveying surface are associated with the sides of the skinn.ing knives away from the conveying surface on both sides of the opening.
When using this device it has been found that the conveying engagement which occurs merely by frictional contact is by no means sufficient to overcome the cutting or splitting forces of the skinning tool and the frictional forces be-tween the back surfaces of the skinning knives and the skin or the fillet meat which increase as the skinning process continues, so that during the course of the skinning the double fillets often tend to stick and remain lying without moving. It has further been found that this primarily happens when the scraping knives have been advanced between the fat strip of each fillet situated in the region of the back fin edge of each fillet and its back meat through to the skin and the skinning process has already begun.
OBJECT OF THE INVENTION
It is an essantial object of the invention to provide for an apparatus for skinning double fillets of, in particular fat fish such as herrings by means of which the skin of the double fillets can be reliably removed whilst cutting free the fat strips present on both sides of the fin holders of the back fins.
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- BRIEF SUMMARY OF THE INVENTION
This object is achievea in accordanc~ with the present invention by an apparatus for ~kinning double flllets of fish such as herrings, the apparatus including a rotatingly driven skinning roller having recesses distributed over its periphery, a skinning knife having a cutting edge arranged at a small distance from the periphery of the skinning roller, a presser face arranged below the cutting edge and defining with the periphery a gap along a part of the latter, and rotatingly driven feed means having a ~eed direction and defining a feed plane, the apparatus further including a pre-severing device situated above the feed plane, the pre-severing device including a pair of knives extending essentially parallel to the feed direction, defininy a gap between them and being essentially perpendicular to the feed plane, the knives having cutting edges which are directed towards the feed plane and approaching each other, and a pair of peeling knives respectively colinear with and following the knives to continue the gap and having edges which are initially directed towards the feed plane and change gradually into peeling edges which extend outwardly a small distance above the feed plane.
The advantages achieved thereby reside in particular in the fact that skinned individual fillets free from fat strips and fat xemnants can be producted from the double fillets by firstly severing, scraping resp. peeling ree the central portion of the double fillet containing the fat strips and the ,, , , - .
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- fin holders up to the skin and then subjecting the thus prepared double fillet to the skinning by means of a skinning apparatus operating in accordance with a known systPm with a reliable feed so that in addition to the skinned fillets also the cut free central portion of the double fillet containing the fat strips and the fin holders of the back fins are produced.
In accordance with a further embodiment of the apparatus in accordance with the invention the knives may be construc-ted as rotarily driven circular knives whose peripheral cutting edges extend to the region of the conveyor surface, but it is also possible to provide such circular knives in addition to the knives upstream of these. Thus the splitting forces may be maintained extremely low so that the cutting, scraping or peeling free o the central portion containing the fat strips and the fin holders proceeds without damage to the delicate fillets, the knives only performing a relatively small part of the cutting in when circular kni~es are provided in addition to the knives.
Preferably a eed channel is arranged upstream of the knives in the transfer directlon inclined to the conveying surface, the feed cha~nel comprising side walls which are in a V~shaped configuration and define a gap between them at their lower edges, which gap i5 in alignment in the transfer direction with the gap between the knives. Thus the fillet halves of the double fillet to be ea to the skinning pxocess . ~, ,, -~, ,, - .:
are deformed hack to approaching their natural position with respect to one another, so that the double fillet can be fed to the cutting edges of the knives o~ the pre-severing device whilst exactly centrally aligned.
In order to ensure a reliable conveying during the processing of the double fille~ in the precutting device also in the case of dried out and thus stiff fillets, for instance as a result of salting, expediently there may be arranged a rotarily driven conveyor in the gap defined between the knives, which conveyor has the same speed as that o the conveying plane and comprises means form-sealingly, i.e.
positively engaging the double fillet to be conveyed.
Xn accordance with a further embodiment the conveyor may comprise a spiked transport wheel, the tips of whose spikes extend to the direct vicinity of the conveyor surface. This provides the possibility of a positive transport o the double fillet during its processing in the pre-peeliny device.
In accordance with yet a further embodiment the conveyor may, in contrast to the aforementioned emhodiment, also comprise an endless rotating chain or belt conveyor provided with spikes engaging the double fillet, at least in the reglon of the scraping or peeling knives. Due to the tension which is thus exerted on the double fillet during its processing in the pre-severing device the double fillet is held tensioned so that a crushing up which disturbs the operating sequence can not occur.
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7:~3 Advantageously the conveyin~ or feed plane may be formed by the end surfaces of closely adjacently positioned protrusions between which the tips of the spikes penetrate.
Thus the tips of the spikes can pierce the skin of the double fillet and so ensure that the latter is securely carried along with them.
In order to guarantee the secure conveying engagement with the skin which is only a few hundreths of a millimetre thick during the skinning, the presser face may be held lightly pressed by spring force against the rotating skinning roller.
BRIEF DESCRIPTION OF THE DRAWINGS
Other and further objects of the present invention will be apparent rom the following description and claims and are illustrated in the accompanying drawings, which, by way of illustration, show preferred embodiments of the present inventi~n and the principles thereof and what now are considered to be the best modes contemplated for applying these principles. Other embodiments of the invention emhodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present in-vention and the scope of the appended claims.
In the drawings Fig. 1 shows an overall view of the skinning machine in accordance with the invention in axonometric representation, ~ ,,.
~ ~ -6 r~ 3 Fig. 2 shows a cross section throuyh the pre severing or pre-peeling device in the region of the knives in front of the peeling knives, Fig. 3 shows a cross section through the pre-severing device ln the region of the peeling knives, and Fig. 4 shows a cross section through the skinning roller with its associated presser ~ace.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In a frame, which is not shown, of a skinning machine for fish there is arranged a feed belt 1 rotarily driven by suitable drive means and guided around a drive roller 2 and a guide roller 3. A conveying surface or feed plane 4 of this fe~d belt 1 can be formed by the end surfaces of closely adjacently situated protrusions. In continuation o~ the end of the feed belt 1 facing the drive roller 2 there is a skinning device 5 which comprises a skinning roller 6 having grooves 7 extending along its periphery from one end face of it to the other.
Between the skinnin~ roller 6 and the point at which the feed belt 1 changes direct~on there is situated a transfer xoller 8 rotating at a speed faster than that of the conveylng surface 4. Associated with the skinning roller 6 is ~ ~., , ; .
a sk~nning knife 9 whose cutting edge lies in the vicinity of the top or culmination line of the skinning roller 6. The inner side of the cutting edge 10 continues into a concave presser face 11 whose radius of curvature ~orresponds to that of the periphery of the skinning rollar 6. The presser face 11 of the skinning knife 9 is held against the periphery of the skinning roller 6 by a slight spring pressure, The cutting edge 10 of the skinning knife 9 is conveniently provided with an inner bevel 12 of several tenths of a millimetre. Above the conveying surface 4 and in the region of the feed belt 1 there is provided pre-severing or pre-peeling device 13 for double fillets 27 to be skinned. Upstream of this pre-severing device 13 there is arranged a feed channel 24 for the double fillets 27 inclined to the conveying surface 4, the feed channel 24 comprising side walls 25 arranged in a V-configuration with a gap 26 between them at their lower edge 5~ The ends of the side wall~ 25 nearest the conveying surface 4 are flattened out into a plane. This pre-severing device 13 comprises a pair of knives 14 parallel to the transfer direction of the feed belt 1 and perpendicular to the conveying surface 4 between which knives 14 there is a gap 15 aligned with the feed channel 24. The edges of the knives 14 facing the conveying surface 4 are formed as cutting edges 16 which gradually approach the latter. As an extension of the knives 14 there is adjacent to them a pair of peeling knives 17 between which the gap 15 is ~urther continued and the edges of which, in continuation of the cutting edges 16 initially extend in a direction toward~ the conveying surface 4 and gradually change into outwardly extending . . .
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peeling edges 18 (Fig. 3), the latter extending spaced a small distance above the conveying surface 4. Instead of the rigidly arranged knives 14 or in addition to these a pair of circular knives 19 can be used ~as depicted in Fig. 1), xotated either mechanically or together with the double fillet which is passed through beneath them, ad-jacent to the peeling knives 17 either directly or in-directly by placing the knives 14 in between. In the gap 15 there can be arranged a rotatably driven conveyor 20, which has the same speed as the conveying surface 4 and which is con~tructed as a spiked transport wheel or as a belt or chain conveyor 21 provided with spikes 22, ~he tips 23 of the spikes 22 extending to the immediate vicinity of the conveying surface 4. If a feed belt 1 is used whose conv~ying surface 4 is constituted by the end surfaces of closely adjacent protrusions the tips 23 of the spikes 22 may mesh in with the conveying surface 4. The conveyor 20 is con~eniently so arran~ed that its conveying engagement first occurs between the circular knives 19 or the knives 14.
The operat1on of the device is as follows:
A hand or machine filletted double illet 27, that is a pair o fillets still adhering in the back region is placed in the feed channel 24 with its skin downwards and preferably wi~h its head end forwards. By virtue of the V-shaped cross sectlon of the channel 24 the fillet ~ . .
halves are brought into a position somewhat app~oachin~
their nat-~ral relative position and thereby an aligning effect is achieved which causes the edge of the back fin to be gulded in the gap 26 at the bottom of th~ feed channel 24. In ordex to improve the downward sliding of the double fillet 27 in the feed channel 24 the surfaces of its side walls 25 can be sprinkled with water. During the downward sliding the double fillet 27 is spread out whilst maintaining the guiding of ~he edge of the back fin so that it comes onto the conveying surface 4 of the feed conveyor 1 lying flat and aligned. The double fillet 27 thus reaches the circular knives 19 of the pre-severing device 13 and is cut into by these on both sides of the central portion 29 containing the fin holders of the back fins up to the vicinity of the inner side of the skin 30.
During the further conveying the knives 14 which are arranged approximately in the planes of the circular knives 19 enter the cuts which, by means of the cutting edges 16 directed towards the conveying surface 4 are deepened rlght up to the inner side of the skin 30. In order to overcome the cutting and frictional forces which occur the double fillet 27 is conveyingly gripped by engagement of its ce~tral portion 29 by the conveyor 20 arranged in the gap 15 between the knives 14 by virtue of the fact that the tips 23 of the spikes 22 pierce it.
The double fillet 27 is ~hus fed to the peeling knives 17 connected to the knives 14 by virtue of frictlonal 1~
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7~:~3 contact of its skin side with the conveying surface 4 and of form-sealing (positive~ contact of it8 central portion 29 with the conveyor 20. Thereby the peeling edges 18 of the peeling knives 17 which gradually extend outwards and constitute a continuation of the edges 16 of the knives directly above the conveying surface 4 effect a peeling free of the central portion 29 along the inner skin which separates the muscle flesh of the fillet from the fat strips situatea on both sides of the fin holders of the back fin edge. Thus prepared, the double fillet 27 is fed to the skinning device 5 which removes the skin 30 in a known manner.
In order to make the initlal cutting more reliable, the cutting edge 10 of the skinning knife 9 is provided with a bevel 12 of several tenths of a millimetre which simultaneously promotes the retention of the so-called silver mirror on the fillet. In order to ensure the difficult removal of the skin which is only a few hundredths o~ a millimetre thick the presser face 11 is held by a slight spring pressure against the periphery of the skinning roller 6 providsd with grooves 7~ As a result of this skinning process two individual fillets 28, the central port~on 29 containing the fat strips, and the skin 30 are obtained as separate poxtions.
As already mentioned, the circular knives 19 may be arrangad alone or ln addition to the knives 14, which extend linearly. In the event that there are no circular knives 19 at all, the knives 14 will be arranged so a~ to take over their function completely.
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2fi3 - extending outwardly in the manner of a plough from points situated adjacent the gap is associated with, and spaced a small distance away fxom a conveying surface transporting the double fillets on their skin s~de. Endless engagement belts rotating synchronously with the conveying surface are associated with the sides of the skinn.ing knives away from the conveying surface on both sides of the opening.
When using this device it has been found that the conveying engagement which occurs merely by frictional contact is by no means sufficient to overcome the cutting or splitting forces of the skinning tool and the frictional forces be-tween the back surfaces of the skinning knives and the skin or the fillet meat which increase as the skinning process continues, so that during the course of the skinning the double fillets often tend to stick and remain lying without moving. It has further been found that this primarily happens when the scraping knives have been advanced between the fat strip of each fillet situated in the region of the back fin edge of each fillet and its back meat through to the skin and the skinning process has already begun.
OBJECT OF THE INVENTION
It is an essantial object of the invention to provide for an apparatus for skinning double fillets of, in particular fat fish such as herrings by means of which the skin of the double fillets can be reliably removed whilst cutting free the fat strips present on both sides of the fin holders of the back fins.
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- BRIEF SUMMARY OF THE INVENTION
This object is achievea in accordanc~ with the present invention by an apparatus for ~kinning double flllets of fish such as herrings, the apparatus including a rotatingly driven skinning roller having recesses distributed over its periphery, a skinning knife having a cutting edge arranged at a small distance from the periphery of the skinning roller, a presser face arranged below the cutting edge and defining with the periphery a gap along a part of the latter, and rotatingly driven feed means having a ~eed direction and defining a feed plane, the apparatus further including a pre-severing device situated above the feed plane, the pre-severing device including a pair of knives extending essentially parallel to the feed direction, defininy a gap between them and being essentially perpendicular to the feed plane, the knives having cutting edges which are directed towards the feed plane and approaching each other, and a pair of peeling knives respectively colinear with and following the knives to continue the gap and having edges which are initially directed towards the feed plane and change gradually into peeling edges which extend outwardly a small distance above the feed plane.
The advantages achieved thereby reside in particular in the fact that skinned individual fillets free from fat strips and fat xemnants can be producted from the double fillets by firstly severing, scraping resp. peeling ree the central portion of the double fillet containing the fat strips and the ,, , , - .
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- fin holders up to the skin and then subjecting the thus prepared double fillet to the skinning by means of a skinning apparatus operating in accordance with a known systPm with a reliable feed so that in addition to the skinned fillets also the cut free central portion of the double fillet containing the fat strips and the fin holders of the back fins are produced.
In accordance with a further embodiment of the apparatus in accordance with the invention the knives may be construc-ted as rotarily driven circular knives whose peripheral cutting edges extend to the region of the conveyor surface, but it is also possible to provide such circular knives in addition to the knives upstream of these. Thus the splitting forces may be maintained extremely low so that the cutting, scraping or peeling free o the central portion containing the fat strips and the fin holders proceeds without damage to the delicate fillets, the knives only performing a relatively small part of the cutting in when circular kni~es are provided in addition to the knives.
Preferably a eed channel is arranged upstream of the knives in the transfer directlon inclined to the conveying surface, the feed cha~nel comprising side walls which are in a V~shaped configuration and define a gap between them at their lower edges, which gap i5 in alignment in the transfer direction with the gap between the knives. Thus the fillet halves of the double fillet to be ea to the skinning pxocess . ~, ,, -~, ,, - .:
are deformed hack to approaching their natural position with respect to one another, so that the double fillet can be fed to the cutting edges of the knives o~ the pre-severing device whilst exactly centrally aligned.
In order to ensure a reliable conveying during the processing of the double fille~ in the precutting device also in the case of dried out and thus stiff fillets, for instance as a result of salting, expediently there may be arranged a rotarily driven conveyor in the gap defined between the knives, which conveyor has the same speed as that o the conveying plane and comprises means form-sealingly, i.e.
positively engaging the double fillet to be conveyed.
Xn accordance with a further embodiment the conveyor may comprise a spiked transport wheel, the tips of whose spikes extend to the direct vicinity of the conveyor surface. This provides the possibility of a positive transport o the double fillet during its processing in the pre-peeliny device.
In accordance with yet a further embodiment the conveyor may, in contrast to the aforementioned emhodiment, also comprise an endless rotating chain or belt conveyor provided with spikes engaging the double fillet, at least in the reglon of the scraping or peeling knives. Due to the tension which is thus exerted on the double fillet during its processing in the pre-severing device the double fillet is held tensioned so that a crushing up which disturbs the operating sequence can not occur.
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7:~3 Advantageously the conveyin~ or feed plane may be formed by the end surfaces of closely adjacently positioned protrusions between which the tips of the spikes penetrate.
Thus the tips of the spikes can pierce the skin of the double fillet and so ensure that the latter is securely carried along with them.
In order to guarantee the secure conveying engagement with the skin which is only a few hundreths of a millimetre thick during the skinning, the presser face may be held lightly pressed by spring force against the rotating skinning roller.
BRIEF DESCRIPTION OF THE DRAWINGS
Other and further objects of the present invention will be apparent rom the following description and claims and are illustrated in the accompanying drawings, which, by way of illustration, show preferred embodiments of the present inventi~n and the principles thereof and what now are considered to be the best modes contemplated for applying these principles. Other embodiments of the invention emhodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present in-vention and the scope of the appended claims.
In the drawings Fig. 1 shows an overall view of the skinning machine in accordance with the invention in axonometric representation, ~ ,,.
~ ~ -6 r~ 3 Fig. 2 shows a cross section throuyh the pre severing or pre-peeling device in the region of the knives in front of the peeling knives, Fig. 3 shows a cross section through the pre-severing device ln the region of the peeling knives, and Fig. 4 shows a cross section through the skinning roller with its associated presser ~ace.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In a frame, which is not shown, of a skinning machine for fish there is arranged a feed belt 1 rotarily driven by suitable drive means and guided around a drive roller 2 and a guide roller 3. A conveying surface or feed plane 4 of this fe~d belt 1 can be formed by the end surfaces of closely adjacently situated protrusions. In continuation o~ the end of the feed belt 1 facing the drive roller 2 there is a skinning device 5 which comprises a skinning roller 6 having grooves 7 extending along its periphery from one end face of it to the other.
Between the skinnin~ roller 6 and the point at which the feed belt 1 changes direct~on there is situated a transfer xoller 8 rotating at a speed faster than that of the conveylng surface 4. Associated with the skinning roller 6 is ~ ~., , ; .
a sk~nning knife 9 whose cutting edge lies in the vicinity of the top or culmination line of the skinning roller 6. The inner side of the cutting edge 10 continues into a concave presser face 11 whose radius of curvature ~orresponds to that of the periphery of the skinning rollar 6. The presser face 11 of the skinning knife 9 is held against the periphery of the skinning roller 6 by a slight spring pressure, The cutting edge 10 of the skinning knife 9 is conveniently provided with an inner bevel 12 of several tenths of a millimetre. Above the conveying surface 4 and in the region of the feed belt 1 there is provided pre-severing or pre-peeling device 13 for double fillets 27 to be skinned. Upstream of this pre-severing device 13 there is arranged a feed channel 24 for the double fillets 27 inclined to the conveying surface 4, the feed channel 24 comprising side walls 25 arranged in a V-configuration with a gap 26 between them at their lower edge 5~ The ends of the side wall~ 25 nearest the conveying surface 4 are flattened out into a plane. This pre-severing device 13 comprises a pair of knives 14 parallel to the transfer direction of the feed belt 1 and perpendicular to the conveying surface 4 between which knives 14 there is a gap 15 aligned with the feed channel 24. The edges of the knives 14 facing the conveying surface 4 are formed as cutting edges 16 which gradually approach the latter. As an extension of the knives 14 there is adjacent to them a pair of peeling knives 17 between which the gap 15 is ~urther continued and the edges of which, in continuation of the cutting edges 16 initially extend in a direction toward~ the conveying surface 4 and gradually change into outwardly extending . . .
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peeling edges 18 (Fig. 3), the latter extending spaced a small distance above the conveying surface 4. Instead of the rigidly arranged knives 14 or in addition to these a pair of circular knives 19 can be used ~as depicted in Fig. 1), xotated either mechanically or together with the double fillet which is passed through beneath them, ad-jacent to the peeling knives 17 either directly or in-directly by placing the knives 14 in between. In the gap 15 there can be arranged a rotatably driven conveyor 20, which has the same speed as the conveying surface 4 and which is con~tructed as a spiked transport wheel or as a belt or chain conveyor 21 provided with spikes 22, ~he tips 23 of the spikes 22 extending to the immediate vicinity of the conveying surface 4. If a feed belt 1 is used whose conv~ying surface 4 is constituted by the end surfaces of closely adjacent protrusions the tips 23 of the spikes 22 may mesh in with the conveying surface 4. The conveyor 20 is con~eniently so arran~ed that its conveying engagement first occurs between the circular knives 19 or the knives 14.
The operat1on of the device is as follows:
A hand or machine filletted double illet 27, that is a pair o fillets still adhering in the back region is placed in the feed channel 24 with its skin downwards and preferably wi~h its head end forwards. By virtue of the V-shaped cross sectlon of the channel 24 the fillet ~ . .
halves are brought into a position somewhat app~oachin~
their nat-~ral relative position and thereby an aligning effect is achieved which causes the edge of the back fin to be gulded in the gap 26 at the bottom of th~ feed channel 24. In ordex to improve the downward sliding of the double fillet 27 in the feed channel 24 the surfaces of its side walls 25 can be sprinkled with water. During the downward sliding the double fillet 27 is spread out whilst maintaining the guiding of ~he edge of the back fin so that it comes onto the conveying surface 4 of the feed conveyor 1 lying flat and aligned. The double fillet 27 thus reaches the circular knives 19 of the pre-severing device 13 and is cut into by these on both sides of the central portion 29 containing the fin holders of the back fins up to the vicinity of the inner side of the skin 30.
During the further conveying the knives 14 which are arranged approximately in the planes of the circular knives 19 enter the cuts which, by means of the cutting edges 16 directed towards the conveying surface 4 are deepened rlght up to the inner side of the skin 30. In order to overcome the cutting and frictional forces which occur the double fillet 27 is conveyingly gripped by engagement of its ce~tral portion 29 by the conveyor 20 arranged in the gap 15 between the knives 14 by virtue of the fact that the tips 23 of the spikes 22 pierce it.
The double fillet 27 is ~hus fed to the peeling knives 17 connected to the knives 14 by virtue of frictlonal 1~
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7~:~3 contact of its skin side with the conveying surface 4 and of form-sealing (positive~ contact of it8 central portion 29 with the conveyor 20. Thereby the peeling edges 18 of the peeling knives 17 which gradually extend outwards and constitute a continuation of the edges 16 of the knives directly above the conveying surface 4 effect a peeling free of the central portion 29 along the inner skin which separates the muscle flesh of the fillet from the fat strips situatea on both sides of the fin holders of the back fin edge. Thus prepared, the double fillet 27 is fed to the skinning device 5 which removes the skin 30 in a known manner.
In order to make the initlal cutting more reliable, the cutting edge 10 of the skinning knife 9 is provided with a bevel 12 of several tenths of a millimetre which simultaneously promotes the retention of the so-called silver mirror on the fillet. In order to ensure the difficult removal of the skin which is only a few hundredths o~ a millimetre thick the presser face 11 is held by a slight spring pressure against the periphery of the skinning roller 6 providsd with grooves 7~ As a result of this skinning process two individual fillets 28, the central port~on 29 containing the fat strips, and the skin 30 are obtained as separate poxtions.
As already mentioned, the circular knives 19 may be arrangad alone or ln addition to the knives 14, which extend linearly. In the event that there are no circular knives 19 at all, the knives 14 will be arranged so a~ to take over their function completely.
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Claims (10)
1. Apparatus for skinning double fillets of fish such as herrings, said apparatus including a rotatingly driven skinning roller having recesses distributed over its periphery, a skinning knife having a cutting edge arranged at a small distance from said periphery of said skinning roller, a presser face arranged below said cutting edge and defining with said periphery a gap along a part of the latter, and rotatingly driven feed means having a feed direction and defining a feed plane, said apparatus further including a pre-severing device situated above said feed plane, said pre-severing device including a pair of knives extending essentially parallel to said feed direction, defining a gap between them and being essentially perpendi-cular to said feed plane, said knives having cutting edges which are directed towards said feed plane and approaching each other, and a pair of peeling knives respectively co-linear with and following said knives to continue said gap and having edges, said edges being initially directed to-wards said feed plane and change gradually into peeling edges which extend outwardly a small distance above said feed plane.
2. Apparatus as claimed in claim 1 wherein said knives comprise rotarily driven circular knives having peripheral cutting edges, which extend to a point adjacent said feed plane.
3. Apparatus as claimed in claim 1 wherein said knives are integral with said peeling knives and said cutting edges of said knives are contiguous with said peeling edges of said peeling knives.
4. Apparatus as claimed in claim 2 wherein a pair of rotarily driven circular knives having peripheral cutting edges, which extend to a point adjacent said feed plane is arranged upstream of said knives.
5. Apparatus as claimed in any one of claims 2 to 4 including a feed channel inclined, when seen in said feed direction, to said feed plane upstream of said knives, said feed channel being defined by two side walls arranged in a V-shape configuration and defining a gap between them at their lower edges, said gap being in alignment with said gap between said knives.
6. Apparatus as claimed in claim 1 including a rotarily driven conveyor arranged in said gap defined between said knives and adapted to be driven at the same speed as said feed means, said conveyor having conveying means adapted to positively convey a double fillet.
7. Apparatus as claimed in claim 6 wherein said conveyor comprises a spiked transfer wheel, the tips of the spikes of said wheel extending to a point adjacent said feed means.
8. Apparatus as claimed in claim 6 wherein said conveyor comprises an endless rotating chain or belt conveyor provided with spikes contacting resp. seizing said double fillet at least in the region of said peeling knives.
9. Apparatus as claimed in claims 7 or 8 wherein said feed plane of said feed means constituted by the front faces of a plurality of adjacent protrusions, said spikes being arranged to extend between adjacent protrusions.
10. Apparatus as claimed in claim 1 wherein said presser face is lightly spring-biassed towards the rotating skinning roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000350014A CA1117263A (en) | 1980-04-16 | 1980-04-16 | Apparatus for skinning double fillets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000350014A CA1117263A (en) | 1980-04-16 | 1980-04-16 | Apparatus for skinning double fillets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1117263A true CA1117263A (en) | 1982-02-02 |
Family
ID=4116725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000350014A Expired CA1117263A (en) | 1980-04-16 | 1980-04-16 | Apparatus for skinning double fillets |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1117263A (en) |
-
1980
- 1980-04-16 CA CA000350014A patent/CA1117263A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |