JPH0253011B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a net hauling machine for purse seine fishing.

[Technical background]

In purse seine fishing in Japan, the size of the net is large compared to the size of the vessel, so when the net is narrowed down during purse seine operation as shown in Figure 7a, the result is as shown in Figure 7b. The line will go inside the twisted net, and if the net is lifted from the side of the ship as shown in Figure 7c, the net will get caught on the bottom of the ship or the propulsion machine, so the net lifting machine should be installed at the stern. It is essential that If the net lifting machine is fixed and installed at the stern in a position suitable for lifting the net, it will get in the way when casting the net, so when casting the net, it should be installed horizontally between the port and starboard sides of the stern so that it can be stored on the side opposite to the working port. need to be moved. Furthermore, as the net hoist progresses, the angle of incidence on the float, where the tension is most applied, to the net hoist is as shown in Figure 8.
Normally, the angle changes by more than 90 degrees, so in order to always raise nets under the same conditions, it is essential for the net hauler to have a swivel function. It is desirable to rotate the net hauler so as to shorten the length occupied by the net.

Once the net has been hoisted using a net-lifting machine, the next step is to lift the fish-trapping net from the side using a side hauler.However, it takes a lot of human power to load the net onto the side-hauler, and it is easy to lift the fish-trapping net from the side. It is desired to be able to transition to frying.

In addition, when using a purse seine, a net is added to the floaters and sinkers to create a net that surrounds a school of fish, but when fishing for a school of fish attached to the seabed or a school of deep water fish, a large number of ties are inserted. It is necessary to increase the depth of the hem of the net, and when lifting the net, the float and sinker ropes are shorter than the body net, so it is necessary to slip the net as appropriate and lift the fish net, the floater, and the sinker line together.

[Conventional technology]

Pursenet fishing methods include the following:

(a) First, as seen in Japanese Patent Publication No. 50-33956 and Japanese Patent Publication No. 59-12250, a plurality of drive rollers are cantilever supported on a common support end member, and adjacent drive rollers are A device has been proposed in which the rotational directions of the rollers are opposite to each other and the fishing net is guided in a meandering manner between these driving rollers to haul the net.

However, since this type of device does not have horizontal movement and turning functions, it cannot be installed at the stern and must be installed midway along the side of the ship, making it unsuitable for Japan's purse-net fishing method. It is something. As mentioned in the technical background above,
The size of Japan's purse seine fisheries is large compared to the size of the vessels. Therefore, as the hoisting process progresses, the boat is pulled inside the net. This means that the net will be caught in the bottom of the ship or the propulsion machine, and in addition, installing such a net lifting machine midway on the gunwale is limited by the length of the side hauler. The efficiency of net lifting work is significantly hindered. Furthermore, since the structure does not allow rotation, the net lifting angle is fixed, making it impossible to perform operations corresponding to the net lifting load.

(b) As shown in Fig. 9, net hauler-based net hoisting means has a large slip rate when hoisting the net.
Small tears in the net fabric tend to occur, and the speed of lifting the net between the float and the net cannot be adjusted. For this reason, there are problems such as the need for manual stepping.

(c) Since the net lifting means shown in Figure 10 lifts the net by sandwiching the net fabric, not only is it not possible to adjust the speed of lifting the fish net, floats, and sinkers, but when the net volume increases, the net lifting force increases. It is not transmitted to the net fabric and the speed of lifting the net decreases.

(d) With the net lifting means shown in Figure 11, in order to improve the net lifting force, it is necessary to lift the machine with a powerful boom, which raises the ship's center of gravity and raises the net lifting force. There are serious problems in that the point of application of force is at a high place, the hull tends to tilt, and operation in rough weather is dangerous. In addition, there are problems in that the net lifting force on the float side is insufficient, and the speed of lifting the net between the float, the fish net, and the sinker cannot be adjusted.

As a means to solve such problems, the applicant has filed Japanese Patent Application No. 179587-1987 (Japanese Unexamined Patent Publication No.
(No. 040233), we proposed the following net-lifting machine for purse seine fishing. This net lifting machine is the 12th
As shown in the figure and FIG. 13, a plurality of net lifting drive rollers 1 and 2 each having a length larger than a diameter are mounted parallel to each other, and one end of each is mounted on a common support end member 3, In a net lifting machine in which the drive rollers 1 and 2 adjacent to each other are driven to rotate in opposite directions, a drive roller is provided on the upper side of the drive roller 1 in parallel with the drive rollers 1 and 2. and a first support end member 3 that is freely rotatable.
A guide roller 4 is provided, and the net contact surface 3a formed on the support end member 3 is configured to be commonly orthogonal to the center axis of each roller, and a rotating shaft 5 for raising and lowering the support end member 3 is provided. A configuration condition in which the axis and the mesh contact surface 3a of the support end member 3 are parallel;
a plane including the axis of the rotating shaft 5, the central axes of the first drive roller 1 and the second drive roller 2 from the upper side of the net lifting roller, and the net contact surface of the support end member 3; This feature is characterized in that the net-lifting direction connecting the two intersections of the net is parallel to each other.

However, this net lifting machine also has the following problems. That is, as shown in Fig. 13, when a large force is applied to the net fabric to be hoisted, in order to prevent the fabric from slipping, the winding angle of the fabric around the drive rollers 1 and 2 is set to be large. When the upper side of the net lifting machine is turned toward the bow direction, the net fabric gets entangled with the last drive roller 2. Specifically, in the figure, the net parts A and B get close to each other, and the part B becomes the final one. th drive roller 2
Continuous hoisting work may be interrupted, or
Or, a net breakage accident occurs.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it solves the problems of the prior art by simple and rational means, and sets the net lifting direction on the float side of the purse seine to the closest point with respect to the net lifting direction line. In addition to adjusting and maintaining the angle in a good condition, it is possible to adjust the net lifting speed between the float side and the sink side, prevent small tears in the net fabric by applying uniform tension to the net fabric, and enable uniform lifting of the net fabric. Our goal is to provide a net-lifting machine that is of excellent quality.

[Structure of the invention]

The configuration of the present invention that solves the problems of the prior art is as follows:
A plurality of drive rollers for hoisting nets each having a length larger than a diameter are mounted in parallel and on a common supporting end member at one end, and the drive rollers adjacent to each other are driven to rotate in opposite directions. In the net lifting machine, a first guide roller is freely rotatably provided on the upper side of the driving roller, parallel to the driving roller, and on a support end member common to the driving roller. The mesh contact surface formed on the support end member is configured to be commonly orthogonal to the central axis of each of the rollers, and the axis of the rotating shaft for raising and lowering the support end member and the mesh contact surface of the support end member are parallel, the axis of the rotating shaft, the central axes of the first drive roller and the second drive roller from the upper side of the net lifting roller, respectively, and the net contact surface of the support end member. The center axis of the first driving roller and the last driving roller from the upper side of the net lifting roller and the support end A straight line connecting two intersections with the plane containing the mesh contact surface of the member,
In addition, at any point on the lower side of the hoisting net than a straight line perpendicular to both straight lines of the central axis of the first drive roller, that axis or its extension intersects with a plane containing the net contacting surface of the supporting end member. The present invention is characterized in that a second roller is provided which can freely rotate and is approximately the same length as or longer than the drive roller.

〔Example〕

1 to 3 show a first embodiment of the invention. FIG. 1 is a front view of the net lifting machine itself, FIG. 2 is a plan view, and FIG. 3 is an explanatory view.

11 is located on the stern deck of the hull 12.
A guide rail 13 is installed in a direction perpendicular to the longitudinal axis of 2.
is mounted so that it can move horizontally. This frame 13
A protrusion 14 is provided on the lower surface, into which a screw rod 15 installed parallel to the guide rail 11 is screwed, and by forward and reverse rotation of the screw rod 15, the pedestal 13 reciprocates along the guide rail 11. It is designed to be moved.

A swivel base 16 is rotatably mounted on the pedestal 13 and is structured to fit into a shaft tube (not shown) provided thereon. And inside this swivel base 16,
Although not particularly shown, a worm wheel is provided, and a worm gear mounted on the upper side of the pedestal 13 is meshed with the worm wheel.
The worm wheel rotates via a worm gear, and the swivel base 16 can also rotate.

As is clear from FIG. 2, 18 is a support end member that has an elongated oval shape in plan view and has a hollow structure inside.A mesh contact surface 18a is formed on the upper surface of the support end member 18. There is. Two (or more than two) drive rollers 19 and 20 are vertically installed perpendicularly to the net contact surface 18a and along the net lifting direction line a-a of the net. At the same time, the line connecting the axes of the drive rollers 19 and 20 is configured to coincide with the net hoisting direction line a-a.

That is, the net hoisting direction line a-a is between the central axes of the first drive roller 19 and the second drive roller 20 from the upper side of the net hoist, and the support end member 18. It is set by connecting two intersections with a plane including the mesh contact surface 18a. Further, a first guide roller 21 disposed on the upper side A of the support end member 18 is vertically disposed on the net contacting surface 18a so as to freely rotate. This guide roller 21 is connected to a sink line 22 of purse seine fishing gear.
It serves as a guide. Further, the drive rollers 19 and 20 for the double-lift net are configured to have a length larger than a diameter.

Furthermore, the driving rollers 19 and 20 are provided with frictional promoting means for mainly hoisting the fishnet portion, specifically, a frictional layer made of rubber or the like on the surface and a large number of locking grooves 23.
The roller portions 19a, 20a are formed with a friction promoting means, and the roller upper portions 19b, 20b have no friction promoting means.

In other words, the body net that makes up the purse seine is sufficiently constricted to create a net that surrounds the school of fish, so the float line is shorter than the body net. For this reason, it is necessary to delay lifting of the float rope by the difference between the net length and the float rope. For this reason, as mentioned above, the float rope is moved to the roller upper part 19 which does not have a friction promoting means.
Guide it to b, 20b, slip it at this part, and balance it with the lifting of the fishnet. As a method without a friction promoting means, it is preferable to use a metal surface with low friction, or to fit a slip ring (not shown) that rotates freely with respect to the drive roller. In addition, in this embodiment, a portion without a friction promoting means is provided, but the entire surface of the drive rollers 19, 20 is made of a rubber layer having a hardness that provides an appropriate friction promoting means, and the condensation causes a higher lift than the net fabric. It is also possible to make it easier to slip the floats and sinkers, which are subject to a lot of tension when netting.

Further, the lower portions of the drive rollers 19 and 20 are fitted and fixed to a pair of gears (not shown) housed in the cavity of the support end member 18, and hydraulic pressure provided on the lower surface of the support end member 18 is fixed. A gear (not shown) rotated by the motor 24 meshes with one of the gears, and drives the drive rollers 19, 2 through both gears.
0 are rotated in opposite directions.

Reference numerals 25 and 26 are jaw members that prevent the float rope 27 and the fish net from slipping upward during net-lifting work.
9 and 20 do not rotate together.

Further, the guide roller 21 guides the dipstick 22 and supplies it to the drive rollers 19 and 20, and is configured to have a smaller diameter than the drive rollers 19 and 20.

In the net lifting machine configured as described above, the present invention provides a first driving roller 19 and a second driving roller 2 from the upper side of the net lifting, as shown in FIG.
0 and a plane including the mesh contact surface 18a of the support end member 18;
-a and at an appropriate position (indicated by diagonal lines) on the downstream side of the straight line c-c perpendicular to both straight lines of the central axis of the first drive roller 19, or an extension thereof. A second guide roller 34 having the same structure as the first guide roller 21 is provided so as to be freely rotatable so that the line intersects with a plane including the mesh contact surface of the support end member 18. The guide roller 34 is configured to have substantially the same length as the drive rollers 19 and 20, or to be longer than this. In this embodiment, the second guide roller 34 is connected to the first and second drive rollers 19 and 2 so as not to reduce the wrapping angle to the second drive roller 20.
0, and a direction line dd, which connects the net exit side of the second drive roller 20 and the net inlet of the net guide roller, are provided at a position that is substantially perpendicular to each other.

Next, the most preferred technical matters in the present invention will be explained.

Reference numeral 28 denotes a rotating shaft that supports the support end member 18 on the swivel base 16 so that it can be raised and lowered.As is clear from FIGS. The center axis line bb is parallel to the net lifting direction aa. The supporting end member 18, more specifically, the tilting means of the mesh contacting surface 18a is orthogonal to the center axis b-b of the rotating shaft 28, and the swivel base 1
This is accomplished by the expansion and contraction action of a cylinder 19 provided between the lower part of the support end member 18 and the lower surface of the support end member 18.

Further, the second guide roller 34 is connected to a direction line a connecting the first and final drive rollers 19 and 20.
It is desirable to provide the position where -a and the direction line dd connecting the net exit side of the last drive roller 20 and the net inlet of the net guide roller are substantially perpendicular.

Reference numeral 30 in the figure is a valve box for operating the hydraulic motors 17, 24 and cylinder 29, and a plurality of valves (not shown) which are switched and operated by an operating lever 31 are accommodated in the valve box 30. There is. Further, the hydraulic conduit connecting the hydraulic motors 17, 24 and the cylinder 29 to the valves can be provided by conventionally known means, and therefore illustrations and explanations are omitted.

[Effect]

Next, the operation of the above embodiment will be explained with reference to FIGS. 4 to 6. FIG. 4 shows purse seine operation in a very normal state, and FIG. 5 shows that the float line 17 is
FIG. 6 shows the purse seine operation when only the float rope 27 is close to the sinker rope 22 side.

4 to 6 show that the float rope 27, the body net 32, and the sinker rope 22 from which the rings have been removed are taken in from between the drive roller 19 and the guide roller 21, and the drive roller 19,
20 in an S-shape to move the hoisted net from the upper side A of the support end member 18 to the lower side B of the hoisted net. Do the net. net direction line a
The swivel base 16 is rotated via the hydraulic motor 17 in order to adapt to the angle θ (approximately 45° in this figure) between the float line 27 and the net lifting direction, that is, the angle of incidence on the float. In addition, the cylinder 29 is arranged so that the float rope 27 is adapted to the roller upper portions 16b, 20b of the driving rollers 19, 20 which do not have friction promoting means, and to the roller parts 19a, 20a which have friction promoting means. by operating the support end member 18,
That is, by adjusting the inclination of the drive rollers 19 and 20 and adjusting the lifting speeds of the float line 27, the body net 32, and the sinker line 22, the net is lifted without any variation. In addition, the support end member 18 is
This is used to adjust the rotation and tilting of the vehicle.

In addition, as shown in FIGS. 3 and 6, in order to prevent the net from slipping when a large force is applied to the net to be lifted, the winding angle of the net to the drive roller 20 is set large. Even if the upper side of the net is turned toward the bow as shown in the figure, the second guide roller 34 rationally prevents the net material from getting entangled with the second drive roller 20.

〔effect〕

As described above, the present invention has the following effects.

(a) The net contacting surface of the supporting end member can be adapted to the direction in which the net is lifted, allowing for smooth and reliable continuous net lifting.

(b) Support end members, specifically, because the drive roller is tiltable, float ropes of different lengths,
By adjusting the speed of lifting nets for fishnets and sedimer nets, it is possible to create a balanced net that is adapted to the length.

(c) The support end member is rotated with respect to the fish net to be lifted by the net lifting machine, and a net that is suitable for the smoothness of the net and the load of the net to be lifted can be produced.

(d) Since the support end member equipped with a drive roller and a guide roller can be rotated, when the net has been lifted and the side hauler is used to lift the net from the side, the upper side of the net can be rotated toward the bow side. You can automatically place the net fabric on the side holer by simply
The manual work of passing the mesh around the side hauler is greatly reduced.

(e) The presence of the second guide roller can prevent the slack of the fabric past the last drive roller from becoming entangled with the last drive roller. In particular, as shown in Fig. 6, when a large force is applied to the net fabric to be lifted, in order to prevent the net fabric from slipping, the winding angle of the fabric around the drive roller is set to be large.
Even if the upper side of the hoisting net is turned toward the bow as shown in the figure, the last driving roller acts to separate the net fabric as shown in Figure 3, and the net lifting operation is interrupted due to entanglement of the net fabric. Accidents such as broken nets can be reasonably prevented.

(f) Since the net lifting machine is located at the stern, it is possible to lay a long side hauler, and a large amount of net is caught on the side hauler, improving the efficiency of side hoisting.

[Brief explanation of drawings]

Fig. 1 is a front view of the net lifting machine of the present invention, Fig. 2 is a plan view of the same as above, Fig. 3 is an explanatory diagram of the main parts, Figs. a, b, c are flow explanatory diagrams from the start of hoisting to the latter half of the hoisting state;
Fig. 8 is an explanatory diagram showing changes in the angle of incidence on the float side, Figs. 9 to 11 show a purse seine fishing machine commonly used at present, and Fig. 12 shows an improvement of the present invention. FIG. 13 is a front view of the target net lifting machine and a plan view of the same as above. 11... Guide rail, 12... Hull, 13...
Frame, 14...Protrusion, 15...Screw rod, 16...Swivel base, 17...Hydraulic motor, 18...Support end member, 18a...Net contact surface, 19, 20...Drive roller, 19a, 20a ...Roller part with friction promoting means, 19b, 20b... Roller upper part without friction promoting means, 21... First guide roller, 2
2... Sink rope, 23... Locking groove, 24... Hydraulic motor, 25, 26... Jaw member, 27... Float rope, 28... Rotating shaft, 29... Cylinder, 30...
... Valve box, 31 ... Operation lever, 32 ... Body net, 3
3... Net sorting machine, 34... Second guide roller.

Claims (1)

[Scope of Claims] 1 (a) A plurality of net lifting drive rollers each having a length larger than a diameter are mounted parallel to each other and each end is pivoted on a common supporting end member, and the above-mentioned In a net lifting machine in which the driving roller is rotationally driven in the opposite direction, (b) on the upper side of the driving roller, parallel to the driving roller, and on a supporting end member common to the driving roller, A first guide roller is provided so as to be freely rotatable, and the mesh contact surface formed on the supporting end member is configured to be commonly orthogonal to the central axis of each of the rollers; (c) raising and lowering the supporting end member; the axis of the rotating shaft,
The configuration condition that the net contacting surface of the support end member is parallel, the axis of the rotating shaft, and the respective central axes of the first drive roller and the second drive roller from the upper side of the net lifting roller among the drive rollers. and a plane that includes the net contacting surface of the support end member, are configured to be parallel to the net lifting direction connecting the two intersections, and (d) furthermore, the first drive roller from the upper side of the net lifting roller and the last The hoisting net is lower than the straight line connecting the two intersection points of the respective central axes of the driving rollers and the plane containing the net contact surface of the support end member, as well as the straight lines perpendicular to both straight lines of the central axis of the first driving roller. At any point on the lower side, the shaft is rotatable freely and is approximately the same length as or longer than the drive roller so that its axis or its extension intersects the plane containing the mesh contact surface of the support end member. 2
A net lifting machine for purse seine fishing, characterized by being provided with a guide roller. 2. The net lifting machine for purse seine fishing according to claim 1, wherein the rotation axis is horizontal. 3. A net hauling machine for purse seine fishing according to claim 1, characterized in that the rotating shaft is inclined so that the upper side of the hauling net is directed downward. 4. There are two drive rollers, and the intersection of the axis of the second guide roller or its extension with a plane including the mesh contact surface of the support end member is an axis passing through the center of both drive shafts; A second guide roller is provided at an arbitrary location on the net contacting surface of the support end member on the lower side of the net hoist, which passes through the center of the first drive shaft and is surrounded by an axis perpendicular to the above-mentioned axis. A purse seine fishing net hauling machine according to claim 1 or 2, characterized in that: