JPH0144056Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of a net lifting device installed in a purse seine fishing boat for lifting fishing nets.

[Prior art]

In general, purse seine fishing boats have a primary tank for catching fish.
A fishing net as shown in the figure is used.

The fishing net a has a long shape, and a large number of floats b are arranged on one side of the fishing net a, and a number of floats b are arranged on the other side.
A large number of sinkers c are arranged facing each other, and the sinkers c serve as weights and sink into the sea, and the floats b float on the sea surface. Various types of fishing nets are used with different materials, shapes, sizes, etc. depending on the species of fish to be caught.

As shown in Fig. 2, the method of using the fishing net is as follows: first, the fishing net A is thrown into the sea and is bulged out from the fishing boat A, and the float B is on the sea surface and the sinker C is submerged in the sea, and the fish in the sea are caught. is surrounded by fishing net a. After this, as shown in Figure 3,
The side is hoisted up by a hoisting device B to float the sinker C to the sea surface, thereby guiding the fish surrounded by the fishing net A to the upper surface of the fishing net A to capture the fish. Then, a net lifting device installed on the stern side of fishing boat A lifts fishing net a in its longitudinal direction and floats b.
The fishing operation is completed by simultaneously lifting nets of sea bream and sea bream c, and storing the fish caught in the fishing net a in an attached fresh fish transport vessel (not shown).

By the way, as a conventional net hauling device for hauling the fishing net a, there is one having a structure as shown in FIGS. 4 and 5, for example.

In the figure, reference numeral 1 denotes a rotating drum having an annular groove 2 with a trapezoidal cross section, and a pair of rollers 3, 3 are rotatably provided on the fishing net introducing side. Then, by rotating the rotary drum 1 by the hydraulic motor 4 and engaging the fishing net a with the upper surface of the annular groove 2 as shown in FIG. 5, the fishing net a is guided by the rollers 3, 3. The net is lifted into the fishing boat A while the fishing boat A is in use.

However, in the conventional net lifting device described above, since the floats b and sinkers c of the fishing net a have different shapes, weights, etc., the frictional force against the annular groove 2 of the rotating drum 1 is Each one is different. The one with smaller frictional force tends to slip against the annular groove 2, and the hoisting speed becomes slower.
In addition, the net with a larger frictional force is less likely to slip against the annular groove 2, and the hoisting speed is synchronized with the rotational speed of the rotating drum 1. The hoisting speed is different between the float C side and the float B side, which is lighter in weight, and is hoisted up later than the float C side. In addition, fishing net a has a longer length on the float b side than the sinker c side, and because the hoisting of floats b and sinker c starts at the same time from each end, this is combined with the above-mentioned difference in hoisting speed. While winding up the fishing net a, twisting occurs in the fishing net a, and when the winding is finished, the amount of twisting becomes large. As a result, not only do many broken nets occur, but it also requires a lot of manpower and troublesome work to return the twisted fishing nets to their original state in preparation for the next cast.

[Purpose of invention]

This idea was made in view of the above circumstances.
A purse seine fishing boat that can adjust the hoisting speed of the float side and the sinker side of the fishing net to equalize the hoisting time for both sides, thereby effectively preventing the twisting of the fishing net and the occurrence of broken nets. The purpose is to provide an improved net lifting device.

[Structure of the idea]

The net lifting device for a purse seine fishing boat of the present invention has a fishing net introduction side of a rotating drum that has an annular groove with a V-shaped or trapezoidal cross section and lifts a fishing net with floats arranged on one side and sinkers arranged on the other side. In a net lifting device in which a pair of fishing net guide rollers are rotatably installed, a sleeve larger than the outer diameter of the rotating shaft is loosely fitted onto the rotating shaft of each of the guide rollers, and each The guide roller can be moved and adjusted relative to the center line of the annular groove of the rotating drum.

〔Example〕

First, the principle of the present invention will be explained in detail with reference to FIG.

When the fishing net a is engaged with the upper surface of the annular groove 2 having a trapezoidal cross section and the rotating drum 1 is rotated in this engaged state, the fishing net a and the annular groove 2 have the following relationship.

That is, since the annular groove 2 has a trapezoidal cross section, the weight of the fishing net a received by the rotating drum 1 becomes heavier as it is closer to the center line of the annular groove 2, and lighter as it is closer to the outer periphery. Therefore, fishing net a and annular groove 2
The frictional force with the annular groove 2 tends to be larger as it is closer to the center line of the annular groove 2, and smaller as it is closer to the outer periphery. In other words, the closer to the center line of the annular groove 2, the greater the frictional force, which makes it difficult to slip and allows nets to be reliably lifted in synchronization with the rotational speed of the rotary drum 1.
Furthermore, the closer to the outer periphery of the annular groove 2, the more likely it is to slip and the lower the winding speed will be.

Therefore, the present invention provides an annular groove 2 of the rotating drum 1.
The position of the rollers 3, 3 for guiding the fishing net can be adjusted with respect to the center line of the annular groove 2 by utilizing the relationship between the fishing net a and the fishing net a, and the guiding position of the fishing net a to the annular groove 2 is adjusted. In particular, the hoisting speed of the fishing net a on the float b side and the sink c side is adjusted.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. Note that the same parts as those of the conventional device will be described with the same reference numerals.

In FIG. 6, 1 is an annular groove 2 with a trapezoidal cross section.
By engaging a fishing net a with the upper surface of the annular groove 2 and rotating the rotating drum 1, the fishing net a is lifted from the sea into a fishing boat. Although the rotating drum 1 is driven by a hydraulic motor, the present invention is not limited to this, and driving means such as an electric motor may also be used.

A pair of rollers 3, 3 are rotatably installed on the fishing net introducing side of the rotating drum 1, and guide the fishing net a into the annular groove 2 of the rotating drum 1. The roller 3 is made of a corrosion-resistant metal such as stainless steel, and as shown in FIG. A rotating shaft shown as 3a having a small diameter is formed. Then, the rotating shaft 3a is connected to the sleeve 5.
The sleeve 5 is loosely fitted into a recess 5a having an inner diameter slightly larger than the outer diameter of the rotating shaft 3a provided in the sleeve 5.
supports the roller 3 rotatably. The side wall 5b forming the recess 5a in the sleeve 5 is inserted into the insertion hole 6a of the bracket 6 whose position is fixed, and the sleeve 5 is screwed onto the bracket 6 with four bolts 7, thereby It is configured to support the roller 3 and sleeve 5.

The recess 5a of the sleeve 5 and the insertion hole 6a of the bracket 6 are provided eccentrically with respect to the center of the bracket 6, and by attaching the sleeve 5 to the bracket 6 by rotating it at an angle of 90 degrees with the bolt 7, As shown in FIG. 8, the position of the roller 3 is from the center position of the bracket 6 shown as A to B, C, and C.
It is configured so that it can be moved to three positions shown as D. Thereby, the position of the pair of rollers 3, 3 can be adjusted with respect to the center line of the annular groove 2 in the rotating drum 1. Note that 8 in the figure indicates a height regulating roller which is rotatably provided at the rear of the rotary drum 1 and regulates the height position of the wound fishing net a.

Next, the action will be explained.

First, the sleeve 5 is attached to the bracket 6 so that the roller 3 on the float b side and the roller 3 on the sink c side are spaced at the same distance from the center line of the annular groove 2. Then, as stated in the above principle, float b
Since the side is lighter in weight, the frictional force with the annular groove 2 is smaller, making it more likely to slip and lowering the hoisting speed.
On the other hand, since the float c side is heavy, the frictional force with the annular groove 2 is large, making it difficult to slip, and the hoisting speed becomes faster than the float b side.

Therefore, the attachment position of the sleeve 5 to the bracket 6 is adjusted so that the roller 3 on the float b side of the fishing net a is located on the center line side of the annular groove 2. Then,
The roller 3 guides the float b side of the fishing net a toward the center line of the annular groove 2, which increases the frictional force with the annular groove 2 and reduces the amount of slip, so that the float b side of the fishing net You can increase the top speed. This adjustment amount is set according to the weight and length of the float B side and the sink C side, so that the hoisting time of the float B side and the sink C side, which have different lengths, is the same. The hoisting speed of the float b side is set slightly higher than that of the sinker c side so that the hoisting of the float b side and the sinker c side is completed at the same time. Thereby, the fishing net a can be hauled up well without being twisted.

Furthermore, the hoisting speed of the fishing net a can be arbitrarily adjusted by adjusting the position of the roller 3 on the sink c side or both rollers 3, without being limited to adjusting the position of the roller 3 on the float b side. I can do it. and,
By adjusting the positions of the pair of rollers 3, 3 according to the type of fishing net, it is possible to carry out net lifting work without twisting or breaking any type of fishing net.

In addition, although the annular groove 2 of the rotating drum 1 has shown the example which has a trapezoidal cross section in the Example, it is needless to say that it is not limited to this and may have a V-shaped cross section, for example. Also, change the roller movement position to 3.
Although we have shown an example of one, it is not limited to this, and it is of course possible to use more or less.

[Effect of idea]

As explained above, according to the present invention, the hoisting speed of the float side and the sinker side of the fishing net can be adjusted, so that the hoisting time for the float side and the sinker side is equal regardless of the type of fishing net. This effectively prevents the twisting of the fishing net and the occurrence of broken nets, and also eliminates the large amount of manpower that was previously required to return the twisted fishing net to its original state. This has the effect of eliminating the need for complicated procedures.

[Brief explanation of the drawing]

Figure 1 is a plan view of a fishing net, Figures 2 and 3 are explanatory diagrams showing how the fishing net is used, Figure 4 is a front view of a conventional net lifting device, and Figure 5 is the lifting net shown in Figure 4. Figure 6a is a front view of an embodiment of the present invention showing the fishing net being rolled up by a net device; Figure 6b is a plan view thereof; a
is a plan view of the main part of the present invention, and b in Fig. 7 is its -
FIG. 8, a cross-sectional view taken along the line, is an explanatory diagram of the position adjustment of the rollers. A: Fishing boat, B: Shipwreck hoisting device, a: Fishing net,
b: float, c: sinker, 1: rotating drum, 2: annular groove, 3: roller, 4: hydraulic motor, 5: sleeve, 6: bracket, 7: bolt, 8: height regulating roller.

Claims (1)

[Scope of utility model registration request] It has an annular groove with a V-shaped or trapezoidal cross section,
In addition, in a net lifting device, a pair of fishing net guide rollers are rotatably installed on the fishing net introduction side of a rotating drum for lifting a fishing net with floats arranged on one side and sinkers arranged on the other side. A sleeve larger than the outer diameter of the rotating shaft is loosely fitted onto the rotating shaft of the roller, so that the movement of each guide roller can be adjusted relative to the center line of the annular groove of the rotating drum. A net lifting device for a purse seine fishing boat.