JPS5922882B2 - Device for measuring the length of seine in water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the field of fisheries, and more particularly to a device for measuring the length of a line lowered into water.

The device of the invention is best suited for small scale seine fishing. When a moving school of fish enters and the mouth of the purse seine is closed, the area enclosed by the purse seine can take any shape depending on the behavior and speed of the fish school.

It is necessary to bring the ends of the tightening closer to each other. When the distance between the two ends of the net is large, the fish will escape from it. Nets can become tangled if most of the net is still on board when you arrive at the fishing spot. Therefore, it is extremely important that the captain always knows the actual length of the net remaining on board and the net at sea. Currently, no equipment exists that can quickly provide accurate information about nets remaining on board and being lowered into the sea.

Normally, the length of such nets is determined entirely by sight, and marks are placed at various points on the net to indicate the length remaining on board. Length measurements by this method are of course inaccurate. It should also be noted that tightening is often done at night when it is impossible to see landmarks. The object of the present invention is to provide a device that can quickly provide accurate information about the length of the net remaining on the ship during netting and the length of the net in the sea.

To achieve this objective, the present invention provides a power supply, a pulse counter connected to said power supply via a plurality of contacts arranged in parallel with each other, and a pulse counter connected to said power supply through a plurality of contacts arranged in parallel with each other, and a and a plurality of elements that can move together with the seine and sequentially operate the contacts when the seine is lowered into the water.

The device of the invention is advantageous in that accurate information is quickly provided to the captain and to the computer used to control the netting operation.

Since the device of the present invention provides highly reliable information, human errors are eliminated. The operation of the device of the invention is unaffected in any weather conditions, including swells. The accuracy of the information can be increased (by increasing the number of elements and therefore the number of contacts at the edge of the net). The device of the invention is particularly advantageous when a computer is used to control fishing operations. According to one embodiment of the invention, the contacts connecting the pulse counter to the power supply are make contacts (normally open contacts).

Each make contact is composed of a pair of plate-like members, one of which is loaded with a force by a spring. The element that activates the contact is an insulating plate inserted between the plate-like members of the contact, which is pulled out from between the plate-like members when the net is lowered into the sea.
The contacts are closed for this purpose. The dielectric plates are connected to the edges of the mesh by flexible connecting members. The above embodiment is advantageous in that its configuration is simple.

This type of device can be assembled by the fishing crew. The reliability of this device is reduced if the contacts become wet and oxidized by the insulating plate. It is therefore advantageous to use contactless sensors which are activated when an element fixed to the edge of the screen passes by.

This sensor is arranged so that all elements pass through one side of it. As the elements pass by the sensor as the net is lowered into the sea, the sensor generates an electrical signal that causes the respective contacts to close. In this case the elements are connected to the edges of the mesh by flexible connectors. This embodiment has the advantage that since the contacts can be placed inside the ship, they are not affected by moisture, thereby increasing the reliability of the device. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a deck 1 of a fishing boat, on which is placed a seine net 2 to which is attached a float line 3 and a bottom line 4 extending along the edge of the seine net 2. ing. The device of the invention comprises a DC power supply 5 and a pulse counter 6 connected to the DC power supply 5 via a series of contacts 7.

Each contact 7 is made of a pair of metal plates, one of which is loaded with a force by a spring. The elements for actuating the contacts 7 are made of electrically insulating plates 8, which are normally inserted between the metal plates of the contacts 7 and are intended to be withdrawn from their position as the net 2 is placed into the sea. Since each insulating plate 8 moves together with the seine net 2, the float line 3 of the seine net 2 is
An insulating plate 8 is then fastened to the flexible connecting member 9. The flexible connecting members 9 are arranged at uniform intervals over the entire length of the levitation line 3. The connecting member 9 can be made of a length of steel wire or a cable made of synthetic material. The number of contacts 7 is determined depending on measurement accuracy. The contact point 7 is a life rail above the net storage area, a special cantilever member (not shown), etc.
It can be placed at any convenient location. The contact point T is arranged to face the direction in which the net 2 moves when it is submerged in the sea. Each contact 1 is housed in a case (not shown) that protects against sea spray. Although the insulating plate 8 can be attached to either the upper or lower edge of the net, it is preferable to attach it to the upper edge as shown in FIG. Any type of pulse counter 6 can be used.

In the simplest case, the counter 6 consists of an electric light 10 placed on a signal board as shown in FIG. The counter 6 can also consist of a digital counter calibrated in meters. Digital counters can also be configured to indicate the length of the net both underwater and on board, if desired. The counter can also be constructed to generate an acoustic signal when the net is submerged, for example by one-quarter, one-half or three-quarters of its length. The counter will be installed on the bridge so that the captain can see it clearly. When used with a computer, the counter can be placed in any convenient location. Switch 11 is used to supply power to the device of the invention before switching on the network.

For safety purposes, a low voltage, eg, 12V or 14V DC power supply is used as the power supply. The invention does not require any changes to the operation of the net, except for the insertion of electrically insulating plates 8 between the metal plates of the contacts 7 after the net 2 has been hoisted aboard the ship.

Next, the operation of the apparatus of the present invention will be explained.

The net 2 is folded and placed on the deck as usual.
An insulating plate 8 is inserted between the metal plates of the contacts 7. Switch 11 is open so that no power is supplied to the device. Before inserting the screen, switch 11 is closed to supply power to the device. Then, the indicator light of counter 6 (not shown)
lights up. As the net 2 is introduced into the sea, the first insulating plate 8 is withdrawn from the first contact 7 by means of a flexible connecting member 9. As a result, when the switch 7 is closed, power is supplied to the first electric light 10 and that electric light 10 lights up.
It is indicated that the first part of the net 2 is under the sea.
If a digital counter is used, the counter is activated when the first contact 7 is closed. While the netting continues, the other insulating plates 8 are successively pulled out from between the metal plates of the contacts 7, so the lights of the counter 6 are turned on one after another, or the digital counter is placed in the sea of the net 2. Sequentially count the number corresponding to the length.

When the last insulating plate 8 is pulled out from between the metal plates of the switch 7, the last electric light is turned on, or the number corresponding to the total length of the net is displayed on a digital counter, so that the captain can see that the net is entangled with the blade of the screw. You can move the ship backwards without worry. When the net 2 is towed onto the ship, the power supply to the device is stopped by opening the switch 11. Next, the net 2 and the float line 3 are hoisted up as usual, and the insulating plate 8 is inserted between the metal plates of the switch 7. In this way, the device is ready for the next screening. Refer now to FIG.

A net 2 is placed on the deck 1 of the ship. A float rope 3 and a bottom rope 4 are attached along the upper and lower edges of this net 2. The device of the present invention includes a power source 5 and a pulse counter 6.
and a sensor 12 that detects the passage of the element 13 that activates the contact 7. All elements 13 must be prepared before netting work.
The sensor 12 is arranged such that the sensor 12 is on one side of the sensor 12. When element 13 passes close to sensor 12, sensor 12 generates a signal that causes contact 7 to close. sensor 12
The generated signal is transferred to a conversion amplifier 15 via a cable 14.
and from there the signals are sent to the respective contacts 17. The counter 6 is connected to the power supply 5 via a contact 17 and an amplifier 15.
connected to. When the contact 7 is closed, the electric light 10 of the counter 6 is turned on. As described above, the counter 6 can be configured with an electric light 10 placed on a single board or a digital counter.

The number of contacts 7 is determined by the desired measurement accuracy. The conversion amplifier 15 is for converting and amplifying the signal generated by the sensor 12, and the type of conversion amplifier to be used is determined by the type of sensor 12. In the embodiment shown in FIG. 2, the sensor 12 is a magnetically inductive transmitter that generates a signal when a metal ball 13 attached to the mesh 2 passes nearby.

In the embodiment shown in FIG. 2, the metal ball 13 moves in a trough 16 in which a slot 17 is provided. The gutter 16 can be provided at any convenient location, for example, it can be placed near the border with the net storage area and oriented in the direction of movement of the net 2 when it is unloaded. The metal ball 13 is inserted into the slot 17 of the gutter 16.
It is secured to the float net of the net 2 by a flexible connecting member 13 extending through it. To extend the life of the sensor 12 and cable 14, the sensor 12 and cable 14 may be installed inside the gutter 16. The contact closing element 13 can also be constituted by a metal ring, which is fitted into a cantilevered guide to which the sensor 12 is mounted at one end. The sensor 12 can also be made of an acoustic device that is sensitive to the sound generated by a metal ball 13 passing near it.

In that case, the place where the metal ball 13 is placed and the place where it moves must be covered with sound absorbing material. Also, a metal plate is placed near the sensor 12 to magnify the sound generated by the metal ball. Similar to the first embodiment of the present invention, the second embodiment
The embodiment also does not require any changes to the mesh operation, except that a metal ball is placed in the gutter on one side of the sensor.

Next, the operation of the apparatus shown in FIG. 2 will be explained.

Prior to netting work, net 2 is placed on deck 1. A metal ball 13 for actuating the contact 7 is placed in the gutter 16 with the flexible coupling member 9 passed through the slot 17. Switch 11 is then closed to supply power to the device. As the net 2 is lowered into the sea, the first metal ball 13 is pulled out of the gutter 16 by the connecting member 9. When the metal ball 13 passes close to the sensor 12, the sensor 12 generates a signal,
The signal is sent to conversion amplifier 15. This conversion amplifier 15
The processed signal is sent to the first contact 7 to close that contact. Thereby, the first electric light 10 of the counter 6 lights up, indicating that the first part of the net 2 has been lowered into the sea. If a digital counter is used as counter 6, the signal is applied to the digital counter. As the net 2 continues to be lowered into the sea, the metal balls 13 are taken out one after another from the gutter 16, and the sensor 12 sends an electrical signal to the conversion amplifier 15 each time the metal ball 13 passes near it, which processes the water. The generated signal is applied to contact 7, causing contact 7 to close.

Then, the electric lights 10 of the counter 6 are sequentially turned on accordingly. When pulling net 2 onto the boat, switch 11
to disconnect the device from power.

The retrieved net is wound up and the flexible connecting member 9 is inserted into the slot 17, thereby reintroducing the metal ball 13 into the gutter 16. The second embodiment of the invention has the advantage that the contact 7 can be installed inside the ship, thereby increasing the life of the device.

[Brief explanation of drawings]

1 is a schematic diagram showing a fishing boat and a first embodiment of a device according to the invention for measuring a seine net and the length of the seine inserted into the sea; FIG. 2 is a schematic diagram showing a second embodiment of the device according to the invention; FIG. 2 is a schematic diagram similar to FIG. 1 illustrating an example; FIG. 2...Seine net, 3...Float line, 4...Bottom line, 5...
- Power supply, 6... Counter, 7... Contact, 8... Electrical insulating plate, 9... Flexible connection member, 12... Sensor, 13... Contact closing element, 15... ... Conversion amplifier.

Claims (1)

[Claims] 1. A power source 5, a pulse counter 6 connected to the power source 5 via a plurality of contacts 7 arranged in parallel with each other, and a pulse counter 6 connected to the power source 5 through a plurality of contacts 7 arranged in parallel with each other, and a suitable a plurality of elements 8 arranged at intervals and capable of moving with the seine 2 to sequentially actuate the contacts 7 when the seine 2 is lowered into the water;
, 13. A device for measuring the length of a dragnet underwater. 2. The device for measuring the underwater length of a seine net according to claim 1, wherein the element 13 is a ring fitted into a cantilevered guide. 3. The device according to claim 1, furthermore, a sensor 2 is provided, and all the elements 13 for actuating the contacts are arranged on one side of said sensor 12, and the seine net 1
Element 13 runs along the side of sensor 2 as sensor 2 is lowered into the water.
Apparatus for measuring the length of a seine in water, characterized in that the sensor 12 is arranged in such a way that the sensor 12 generates a signal for causing the sensor 2 to close its respective contact. 4. The device according to any one of claims 1 to 3, characterized in that the element for actuating the contact is connected to the edge of the seine 2 by a flexible connecting member. A device that measures the length of a net underwater. 5. The apparatus according to claim 1 or 3, characterized in that it has a conversion amplifier 15 connected between the sensor 12 and the contact 7, and measures the length of a seine in water. device to do.