JP2011083250A - Fish scaler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fish scaler which reliably scrapes scales even with low water pressure by using a low-capacity pump to reduce facility cost and operation cost. <P>SOLUTION: A gap to expose a transporting fish is formed between an upstream-side conveyor part 32U1 and a downstream-side conveyor part 32U2 of a conveyor, and scales of the fish are scraped by ejecting a water stream against the surface of the fish at the gap with the scaler including a header 44 and a plurality of water-ejection nozzles 46 supplied with pressurized water from the header 44. The header 44 is attached to a swinging member 48 extended over the gap and swingably supported over a sprocket shaft 34S of the conveyor parts 32U1 and 32U2 across the gap. Even if the sprocket shaft 34S is moved upward and downward following the surface of the fish, the variation of the gap between the water-ejection nozzles 46 and the fish surface can be decreased to enable narrowing of the gap. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fish scale remover that removes fish scales with spray water, and more particularly to an improvement of a fish scale remover that can remove scales with a predetermined pressure regardless of the inclination or height of the surface of the fish.

  As shown in Patent Document 1 and FIG. 10, the present applicant has proposed a scale remover that removes fish scales with water sprayed from a spray nozzle. In this fish scaler, the water injection nozzle N, which is a water injection means, generally supplies water to the surface of the fish that passes through the gap between the upstream conveyor CU that conveys the fish and the downstream conveyor CL. It sprays to remove fish scales.

  In the fish scaler according to the prior art, as described in FIGS. 1 to 3 and paragraph number (0023) of Patent Document 1, and as described in FIG. N is attached and held on the bearing SB of the sprocket S that is spring-biased so as to press the downstream end of the upstream conveyor CU against the fish.

  According to this prior art, when the sprocket shaft moves up and down according to the thickness of the fish against the spring bias, the water injection nozzle N also moves up and down. However, as shown in FIG. When moving up and down, the height and inclination (water injection angle) of the water injection nozzle N with respect to the surface of the fish F being water-injected vary. That is, in the spray nozzle N of a specific design, as shown in FIG. 11 (A), at the stage where the fish F does not appear in the gap G of the conveyor C, the conveyor surface of the water spray nozzle N (the lower side because there is no fish) If the height (distance or interval from the nozzle mouth to the reference surface) and the inclination (water spray angle) are set to 60 mm and 65 °, respectively, the fish F moves between the upper and lower conveyors. As shown in FIGS. 11 (B) to 11 (E), the interval of the water spray nozzle N with respect to the surface of the fish F changes as 105 mm, 75 mm, 35 mm, and 50 mm as it passes through the gap G. The inclination of the water injection nozzle N with respect to the surface of the fish F (water injection angle) varies as 45 °, 55 °, 75 °, and 80 ° as shown in FIGS. 11B is a position where the fish F has started to hit the jet water, FIG. 11C is a position where the thickest portion of the fish F contacts the downstream end of the upper upstream conveyor, FIG. D) shows the position where the thickest part of the fish F contacts the upstream end of the downstream conveyor, and FIG. 11E shows the position where the tail of the fish F contacts the downstream end of the upstream conveyor. .

  In this way, if the height (interval) or inclination of the water jet nozzle N with respect to the fish surface changes, it becomes difficult to remove scales at large intervals or large inclinations. The water pressure supplied to the water injection nozzle N is set high so that it can be removed.

  Thus, in order to set the water pressure high, a large capacity pump is required. For example, for a fish that is difficult to remove scales, if a water pressure of 3 MPa is required to remove scales regardless of variations in the height (interval) and inclination of the water injection nozzle, the pump that supplies this water pressure is 22. Requires 5Kw of power. For this reason, the equipment cost and operating cost of the pump are expensive, and the entire scaler has the disadvantages of being enlarged.

JP-A-5-049387 Japanese Patent Laid-Open No. 4-228023 JP-T-2004-4060070

  The problem to be solved by the present invention is to provide a fish scaler that can reliably remove scales even at a low water pressure, and thus can reduce equipment costs and operating costs using a small capacity pump. There is.

  The first problem-solving means of the present invention comprises an upper and lower conveyor that conveys fish while sandwiching the fish, and the fish being conveyed is exposed between the upstream conveyor portion and the downstream conveyor portion of one or both of the upper and lower conveyors. In a fish scaler comprising a conveyor means having a gap to be removed and upper and lower water jetting means comprising a plurality of water jet nozzles for jetting water onto the surface of the fish through the gap between the conveyor means to remove fish scales. The water spray means is provided across a gap and is attached to a swinging member that is swingably supported across the rotation shafts of the conveyor portions on both sides of the gap. There is to do.

  In the first problem-solving means of the present invention, the upper water jetting means includes a header that extends across the conveying direction of the conveyor means and supplies water to the plurality of water jetting nozzles, and the header serves as the swinging member. It is preferably attached.

  In addition, the header may have a guide mechanism that guides the header to move up and down while maintaining both ends in the width direction horizontal.

  The second problem-solving means of the present invention comprises an upper and lower conveyor that conveys fish and sandwiches the fish being conveyed between the upstream conveyor portion and the downstream conveyor portion of one or both of the upper and lower conveyors. In a fish scaler comprising a conveyor means having a gap between the upper and lower water jet means and a plurality of water jet nozzles for jetting water onto the surface of the fish through the gap between the conveyor means to remove fish scales. The water jetting means is provided in a fish scaler, which is disposed in an upper gap and is attached to a rocking member which is swingably supported by a rotation shaft of a conveyor portion on one side of the gap. There is.

  In the second problem-solving means of the present invention, the upper water jetting means includes a header that extends across the conveying direction of the conveyor means and supplies water to the plurality of water jet nozzles, and the header serves as the swing member. It is preferably attached.

  According to the present invention, the water jetting means is disposed across the gap between the conveyor parts and is supported swingably on the rotation axis of the conveyor part on both sides of the gap or on the rotation axis of the conveyor part on one side. Because of this, the variation in the distance between the tip of the water jet nozzle and the surface of the fish is small according to the thickness of the fish, as in the prior art that is fixedly attached to the bearing of the rotating shaft. Therefore, scales can be reliably removed with low water pressure, and therefore the pump that is the source of spray water can be small in size, reducing equipment and operating costs, and the pump can be installed in the machine frame. The overall size can be reduced.

1 is an overall top view of a fish scaler according to one embodiment of the present invention. It is a side view of the fish scaler of FIG. It is a front view of the fish scaler of FIG. It is a top view of the principal part of the water injection means of the fish scaler of FIG. It is a side view of the same part as Drawing 4A. It is a front view of the same part as Drawing 4A. It is a perspective view of the header of the same part as Drawing 4A. FIG. 5 is an enlarged side view of the same portion of the header and the swing member as in FIG. 4 is the same view as FIG. 4 (C), but is a front view when the water injection means is modified. 1 shows the operation of the fish scaler of FIG. 1, and FIGS. 1A to 1E show the state where the fish F has entered the gap sequentially from the position where the fish F has not reached the gap G, from the head to the tail of the fish, It is explanatory drawing. It is a top view of the principal part by the modification of the fish scaler of FIG. It is a side view of the same part as Drawing 7A. It is a front view of the same part as FIG. 7A. It is a perspective view of the guide mechanism of the header of the same part as Drawing 7A. It is a disassembled perspective view of FIG. 7D. It is operation | movement explanatory drawing of the fish scaler by FIG. It is a top view of the principal part of the fish scaler by other embodiment of this invention. It is a perspective view of the same part as FIG. 9A. It is schematic operation explanatory drawing of the fish scaler by the form of FIG. 9A and FIG. B. It is a side view which shows the attachment state of the water injection nozzle of the fish scaler by a prior art. FIG. 10 shows the operation of the fish scaler according to the prior art of FIG. 10, and FIGS. 6A to 6E show the water injection nozzles in the same positions as the operation positions of FIGS. It is explanatory drawing which shows the state to displace.

  A fish scaler 10 according to the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a fish scaler 10 according to one embodiment of the present invention. A machine frame 20, conveyor means 30 including upper and lower conveyors 32U and 32L provided on the machine frame 20, and upper and lower water jet means 40 for jetting water onto the surface of the fish F to remove scales are provided. Yes.

  The upper conveyor 32U includes an upstream conveyor portion 32U1 and a downstream conveyor portion 32U2 arranged so as to form a gap GU in the middle thereof, and the lower conveyor 32L forms a gap GL in the middle thereof. It comprises an upstream conveyor portion 32L1 and a downstream conveyor portion 32L2. As can be seen from FIG. 2, the gap GU of the upper conveyor 32U and the gap GL of the lower conveyor 32L are formed to be shifted in the transport direction. As shown in FIG. 6, the fish F is conveyed while being sandwiched between the upper and lower conveyors 32U and 32L. The gaps GU and GL are exposed from the conveyor means 30 while the fish F is being conveyed by the conveyor means 30 so that scales can be removed from the surface by the upper and lower water jet means 40 described later.

  In the illustrated embodiment, the conveyor means 30 is in the form of a chain and sprocket, but may be in the form of a pulley that is friction driven. Each conveyor portion 32U1, 32U2 and 32L1, 32L2 of the conveyor means 30 includes two bottom sprockets 34US and 34LS and apex sprockets 34US and 34LS, respectively. These sprockets 34US, 34LS (hereinafter these sprockets are collectively referred to by reference numeral 34) are spring-biased so as to tension the corresponding conveyor belt.

  In the illustrated form, the sprocket 34US for the upper conveyor is rotatably supported by a sprocket bearing 38U that is slidably supported by a pair of guide rods 36R and 36L held on the machine frame 20, and these sprockets. The bearing 38U is biased in the direction of tensioning the conveyor belt by a spring 38SPU. That is, the bottom sprocket bearing 38U is spring-biased downward so that the upper conveyor portions 32U1, 32U2 pressurize the lower conveyor portions 32L1, 32L2, and the apex-side sprocket bearing 38U has a conveyor portion 32U1, The spring is biased so as to push the top of 32U2 upward. On the other hand, as shown in FIG. 2, the lower conveyor portions 32L1 and 32L2 are supported by a base side (upper side) sprocket bearing 38L at a predetermined position of the machine frame 20, and the apex side (lower side) sprocket bearing 38L is a conveyor portion. The springs are biased so as to tension 32L1 and 32L2.

The water injection means 40 is particularly shown in detail in FIGS. 2 and 4, and the water injection means 40 is provided with a hose 44H (see FIGS. 3 and 4E) at an injection water source such as a pump (not shown). And a plurality of water injection nozzles 46 that are provided on the header 44 and receive pressurized water from the header 44. The water jetting means 40 is provided so as to jet water onto the fish surfaces exposed in the gap GU of the upper conveyor 32U and the gap GL of the lower conveyor 32, respectively. Among them, the upper water injection means 40U will be described in detail below, but the lower water injection means 40L is fixedly attached to the machine casing 20. The lower water injection means 40L is in the fixed position because the lower surface of the fish F is maintained in a substantially flat state by the upper conveyor 32U when the fish F is sandwiched between the upper and lower conveyors 32U and 32L. This is because the distance between the water injection nozzle 46 and the lower surface of the fish F is substantially constant. In the illustrated embodiment, the water injection means 400 is provided slightly upstream of the water injection means 40 and removes the scales at the upper and lower edges of the fish F by the gap GU, but this is the same as in the prior art. Detailed description thereof will be omitted.

  As shown in FIGS. 3 and 4, the header 44 of the upper water injection means 40U includes a downstream sprocket 34US of the upstream conveyor portion 32U1 of the upper conveyor 32U and an upstream sprocket 34US of the downstream conveyor portion 32U2. The left and right ends of these sprocket shafts (rotating shafts) 34S are attached to strip-like left and right swing members 48 that are pivotally held.

  More specifically, as shown in FIGS. 4D and 4E, the header 44 is held by a plate-like holding member 44B, and left and right swinging members 48 are provided at both ends of the holding member 44B. It has an L-shaped holding piece 44BP to be detachably fixed by a screw 48T. The left and right oscillating members 48 have a long hole 48LH through which the upstream sprocket shaft 34S passes and a circular hole 48CH through which the downstream sprocket shaft 34S passes, and the oscillating member 48 includes these holes 48LH, The sprocket shaft 34S passing through 48CH is held across the downstream sprocket 34US of the upstream conveyor portion 32U1 and the upstream sprocket 34US of the downstream conveyor portion 32U2. The reason why the hole through which the downstream sprocket shaft 34 of the upstream conveyor portion 32U1 passes is a long hole 48LH is based on the change in the surface of the fish F, as will be described in detail later with reference to FIG. This is to allow a vertical displacement difference between the downstream sprocket shaft 34S of the upstream conveyor portion 32U1 and the upstream sprocket shaft 34S of the downstream conveyor portion, and the long hole 48LH and the circular hole 48CH are reversed upstream and downstream. In addition, both the upstream and downstream sides may be long holes.

  A large number of water injection nozzles 46 are provided in the header 44 at intervals in the longitudinal direction, as shown in FIGS. 3 and 4C. The pressurized water supplied to the header 44 is supplied after being divided into these water injection nozzles 46, and water is injected onto the surface of the fish F from the nozzle openings. In the illustrated embodiment, the fish F is transported in the transport direction, but two water spray nozzle rows 46A and 46B are provided close to each other (see FIG. 4B). In this nozzle row, scales on the surface of the fish F are erected with water jetted from the water jet nozzle 46A in the first row, and scales raised with water jetted from the water jet nozzle 46B in the next row are stripped off. This is a known technique already known in Patent Documents 2 and 3.

  In this way, the water injection nozzle 46 of the water injection means 40 is held by these sprocket bearings 38U across the adjacent sprocket bearings 38U of the conveyor portions 32U1 and 32U2 that sandwich the gap of the upper conveyor 32U via the header 44. When attached to the rocking member 48, the water jet nozzle 46 remains close to the surface of the fish F passing through the gap GU, regardless of the height or inclination of the surface of the fish F. Maintained.

  This state is shown in FIG. 6, and the movement of the water injection nozzle 46 will be described in detail with reference to FIG. As shown in FIG. 6 (A), when the fish F does not appear in the gap GU of the conveyor 32U, the surface of the conveyor 32L of the water injection nozzle 46 (the surface of the lower conveyor becomes the reference plane because there is no fish). When the interval (distance from the nozzle opening to the reference plane) and the inclination (water injection angle) are set to 35 mm and 70 °, respectively, the water injection nozzle is transferred as the fish F passes between the upper and lower conveyors and passes through the gap GU. 46 is displaced. As shown in FIG. 6 (B), at the position where the fish F starts to hit the jet water, the inclination (water jet angle) of the fish F with respect to the surface FS is about 67 °, and the interval is about 33 mm. In the position where the thickest part of the fish F contacts the downstream end of the upper upstream conveyor 32U1, the water spray angle with respect to the surface of the fish F is about 70 ° and the interval is about 28 mm. 6 (D), at the position where the thickest part of the fish F is in contact with the upstream end of the downstream conveyor 32U2, the water spray angle with respect to the surface of the fish F is about 70 °, and the interval is about Further, as shown in FIG. 6 (E), at the position where the tail of the fish F contacts the downstream end of the upstream conveyor 32U1, the water injection angle with respect to the surface of the fish F is about 74 °, and the interval is about 42 mm.

  As described above, regardless of the position of the fish F, the inclination of the water injection nozzle 46 (water injection angle) and the variation in the interval between the nozzle mouth and the surface of the fish F are small, and the water injection angle is The optimum angle of about 70 ° can be maintained, and the distance between the nozzle opening of the water jet nozzle and the surface of the fish F can be significantly smaller than the maximum distance of 105 mm of 42 mm or less.

  The angle at which spray water hits the surface on which scales grow (water spray angle) can remove scales most efficiently at around 70 °, and if it becomes an acute angle, it becomes difficult to remove scales. In particular, when the angle is 40 degrees or less, the removal of scales is extremely worse, and when it exceeds 90 degrees, the scale is in the same direction as the scales are growing, and therefore the scales cannot be removed. On the other hand, if the distance between the nozzle mouth of the injection nozzle 46 and the surface of the fish is 42 mm or less, the scale is sufficient even with a low water pressure of 0.7 MPa with a pump of about 7.5 Kw, depending on the type (shape) of the fish. Can be removed.

  The water injection nozzle 46 is integrally fixed to the header 44 as shown in FIGS. 4C and 4D so that the mounting pitch of the water injection nozzles 46 can be reduced. In this case, it is preferable that the water injection nozzle 46 is removed from the machine together with the header 44, and maintenance is performed outside the machine. This is done by attaching and detaching with a screw 48T as shown in FIG. It can be carried out.

  FIG. 5 shows that the header 44 of the water injection means 40 is not horizontal, but is gradually inclined downward from the middle in the width direction to the left and right, and the nozzle and fish surface on the entire surface of the fish along the surface shape of the fish. The modification which made the space | interval of further smaller is shown.

  FIG. 7 shows a modification of the present invention including a guide mechanism 40G in which the water ejecting means 40 guides the header 44 of the water ejecting means 40 in the vertical direction while maintaining its horizontal state. In this modification, the header 44 is not directly attached to the swing member 48 but is placed on the left and right swing members 48 via receiving rods 44R extending horizontally from the both ends of the header 44 to the left and right. In particular, as shown in FIGS. 7D and 7E, the guide mechanism 40G is a pair of left and right guides for guiding the left and right guide pieces 44P attached to the header 44 via the upward vertical arms 44A in the vertical direction. These guide members 44GM are fixedly suspended from the upper frame 20U of the machine casing 20 and suspended. The guide piece 44P is usually guided by an extension spring 44S provided between a lower surface of the guide piece 44P and a spring receiver 44RA fixed to the lower end of the guide rod 44R. A header 44 mechanically integrated with the piece 44P and the guide piece 44P is urged downward to press the header 44 against the swing member 48. In FIG. 7E, reference numeral 44GR denotes a slip prevention rod that is attached between the pair of left and right guide members 40GM so as to sandwich the front and rear of the vertical arm 44A of the header 44 and prevents the header from shifting in the front-rear direction. is there.

  According to this modification, the water spray nozzle 46 moves up and down along the surface of the fish F together with the swinging member 48 while maintaining the horizontal state by the guide mechanism 40, and the operation is shown in FIG. As shown in FIG. 8A, before the fish F enters the clearance GU between the upstream and downstream conveyors 32U1 and 32U2, the downstream sprocket shaft (rotary shaft) 34UR and downstream of the upstream conveyor portion 32U1. The left and right swinging members 48 pivotally supported between the upstream conveyor portion 32U2 and the upstream sprocket shaft (rotary shaft) 34UR are in a horizontal state at the lowest position, and the header 44 also swings left and right. While still on the member 48, it is also in the lowest position. Thereafter, when the fish F enters the gap GU, as shown in FIGS. 8B to 8E, the swinging member 48 swings along the surface of the fish F as in FIGS. 6B to 6E. While moving (tilting), the header 44 moves up and down together with the swinging member 48 while maintaining the horizontal state by the guide mechanism 40G. That is, when the surface of the fish F is raised, the header 44 placed thereon rises while compressing the spring 44S as the swinging member 48 rises, but the header 44 has guide pieces 44P attached to both ends thereof. Therefore, the receiving rod 44R slides on the swinging member 48 and moves up and down while maintaining the horizontal state regardless of the tilt of the swinging member 44. The nozzle opening of the nozzle 46 is maintained in a certain direction.

  FIG. 8 is a view similar to FIG. 6, and shows the values of the interval and the inclination of the water injection nozzle 46 with respect to the fish surface when the fish passes through the gap GU. From this figure, it can be seen that the slope varies greatly from 50 ° to 79 °, but the spacing only causes small variations from 26 mm to 50 mm. Therefore, scales can be reliably removed even at a low water pressure.

  Another embodiment of the present invention is shown in FIG. 9, in which the oscillating member 48 includes a downstream sprocket shaft 34US of the upstream conveyor portion 32U and an upstream sprocket of the downstream conveyor portion 32L. Rather than straddling the shaft 34LS, one end is swingably supported only by the downstream sprocket shaft 34US of the upstream conveyor portion 32U, and the upstream and downstream conveyor portions 32U1 of the upper conveyor 32U are supported at the other end of the swing member 48. , 32U2 is different from the previous embodiment in that it has a copying roller 48R that engages with the floor surface (a part of the machine frame) of the gap GU and the fish F and moves up and down following the surface of the fish.

  In this embodiment, as shown in (1) to (5) of FIG. 9C, the injection angle only varies within a narrow range of a preferable injection angle from 67 ° to 76 °, and the reference plane The interval between the nozzle openings with respect to is extremely small, such as 30 mm to 43 mm, and the fluctuation is small, and scales can be taken well with a low water pressure.

  The scaler having the structure of FIGS. 1 to 3 is set to the water spray angle and interval of FIG. 6A to reliably remove two different fish scales and the scale of the structure of FIGS. A comparative example in which the machine is set to the water injection angle and interval shown in FIG. 11A to reliably remove two different fish scales is as follows.

(Example 1)
Fish: salmon
Pump: Ebara Pump 7.5Kw (1 unit)
Water pressure: 0.4 to 0.5 MPa
Strike force: 1.2 N / cm (in the case of 0.5 MPa and an interval of 30 mm)
Conveyor speed: 6-7m / min
(Comparative Example 1)
Fish: salmon
Pump: Grundfos 7.5Kw + 15Kw (2 units in series)
Water pressure: 1.5-2.5 MPa
Strike force: 5.6 N / cm (when 3 MPa and interval 30 mm), 2.8 N / cm (when 3 MPa and interval 60 mm), 1.8 N / cm (when 3 MPa and interval 90 mm), 1.2 N / cm (In case of 3MPa and 110mm interval)
Conveyor speed: 6-7m / min

(Example 2)
Fish: salmon
Pump: Ebara Pump 7.5Kw (1 unit)
Water pressure: 0.5 to 0.7 MPa
Strike force: 1.2 N / cm (in the case of 0.5 MPa and an interval of 30 mm)
Conveyor speed: 6-7m / min
(Comparative Example 1)
Fish: salmon
Pump: Grundfos 7.5Kw + 15Kw (2 units in series) Water pressure: 2.5-3. 0 MPa
Strike force: 5.6 N / cm (when 3 MPa and interval 30 mm), 2.8 N / cm (when 3 MPa and interval 60 mm), 1.8 N / cm (when 3 MPa and interval 90 mm), 1.2 N / cm (In case of 3MPa and 110mm interval)
Conveyor speed: 6-7m / min

  As can be seen from the above examples and comparative examples, according to the present invention, a small-capacity pump can be used, so that the equipment cost and operation cost are low, and the pump is downsized. It can be seen that the entire scaler can be miniaturized.

  According to the present invention, the water injection nozzle is merely displaced with a small fluctuation while maintaining a small distance between the tip of the water injection nozzle (nozzle port) and the surface of the fish regardless of the elevation of the sprocket of the conveyor. A small capacity pump can be used, and the industrial and utility can be increased by reducing the equipment and operating costs.

F Fish GU, GL Gap between upstream and downstream conveyors 10 Fish scaler 20 Machine frame 30 Conveyor means 32U, 32L Upper and lower conveyors 32U1, 32U2 Upper and lower conveyor sections 32L1, 32L2 Lower conveyor upstream and downstream conveyors Portion 34 Sprocket shaft 36 Guide rod 38 Sprocket bearing 38S Spring 40 Water injection means 40G Guide mechanism 44 Header 44A Upward vertical arm 44B Plate-shaped holding member 44BP Holding piece 44H Hose 44G Guide rod 44P Guide piece 44HR Receiving rod 44GM Guide member 44R Guide rod 44RA Spring receiver 44S Extension spring 46 Water injection nozzle 46A, 46B Water injection nozzle array 48 Oscillating member 48R Copying roller 48T Screw 48LH Long hole 48CH Circular hole

Claims (5)

  Conveying means comprising upper and lower conveyors for conveying fish sandwiched between the upstream conveyor part and the downstream conveyor part of one or both of the upper and lower conveyors, and a conveyor means for exposing the fish being conveyed In the fish scaler comprising a water spraying means comprising a plurality of water spraying nozzles for spraying water onto the surface of the fish with a gap to remove the fish scales, the water spraying means is disposed across the gap. A fish scaler, wherein the fish scaler is attached to a swinging member supported so as to swing freely across the rotation shafts of the conveyor portions on both sides of the gap.   2. The fish scaler according to claim 1, wherein the water jetting unit includes a header that extends across a conveying direction of the conveyor unit and supplies water to the plurality of water jetting nozzles. A fish scaler attached to the swing member.   Conveying means comprising upper and lower conveyors for conveying fish sandwiched between the upstream conveyor part and the downstream conveyor part of one or both of the upper and lower conveyors, and a conveyor means for exposing the fish being conveyed In the fish scaler comprising a water spraying means comprising a plurality of water spraying nozzles for spraying water onto the surface of the fish with a gap to remove the fish scales, the water spraying means is disposed across the gap. A fish scaler, wherein the fish scale is attached to a swinging member that is swingably supported by a rotation shaft of a conveyor portion on one side of the gap.   4. The fish scaler according to claim 3, wherein the water jetting means includes a header that extends across a conveying direction of the conveyor means and supplies water to the plurality of water jet nozzles. A fish scaler attached to the swing member.   5. The fish scaler according to claim 3, wherein one end of the swinging member is swingably supported by the rotating shaft, and the other end of the swinging member has a surface of the fish or a conveyor above the fish. A fish scaler comprising a copying roller that follows a floor surface of a gap between upstream and downstream conveyor portions.

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