Frog nodule weaving device

Abstract

It forms a good frog-fork knot for netting threads made of thick, high-strength threads with a large outer diameter. [Solution] The winding standby position of the winding hook 42 is offset in the direction of rotation to correspond to the unwinding angle of the winding hook 42 due to the large stretch resistance of the warp thread V. When the winding hook 42 reaches the winding completion position and is unwound in the counter-rotation direction, the offset angle of the winding hook 42 set in accordance with the unwinding angle cancels out the unwinding angle, and the winding hook 42 that has reached the winding completion position is positioned facing the front position of the engaging hook 43, with the winding guide portion 42b extending in the forward and backward direction of the engaging hook 43, and the winding hook 42 is set in a position where the engaging hook 43 can be smoothly inserted into the inner space of the winding hook 42.

Description

Technical Field

[0001] The present invention relates to a frog or nodule net knitting device that forms a net body composed of frog or nodules as knots.

Background Art

[0002] Generally, in a net body such as a fishing net, frog or nodules are often formed as knots of the netting. In a frog or nodule net knitting device for forming frog or nodules, as disclosed in Patent Document 1, Patent Document 2, etc. below, from a state where a winding key is rotationally driven and a vertical thread is wound in a loop shape, an engaging key is inserted into the inner space of the winding key, and the engaging key is engaged with a part of the loop-shaped vertical thread. Then, a part of the vertical thread engaged with the engaging key is pulled out to the outside of the winding key together with the engaging key, and a horizontal thread is passed through the vertical thread pulled out to the outside and tightened, so as to form a frog or nodule portion on a net body such as a fishing net.

[0003] Also, when forming such a frog or nodule portion, by making the vertical thread wound around the winding key in a double layer state, a so-called double frog or nodule portion is formed, preventing slippage at the frog or nodule portion and enhancing the anti-slip property, and improving the strength of the nodule portion has also been conventionally performed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] However, when forming the aforementioned frog-fork knot, if thick netting threads with a large outer diameter are used as warp threads, such as the thick Izanastowine (a bundle of 8 to 12 strands of 1600 denier thread) used in the sleeve portion and front portion of the netting of trawl fishing gear used on offshore bottom trawlers, the resistance to elongation of the warp threads becomes considerably large, making it difficult to curve the warp threads into a loop shape when forming the frog-fork knot.

[0006] Specifically, in the process of forming the frog-fork knot shown in Figure 12, first, starting from the winding start position (winding standby position) in Figure 12(A), the winding hook F is rotated in a plane as shown in Figure 12(B) to hook the warp thread V onto the winding hook F, and the warp thread V is wound around the winding hook F while being curved. At that time, the warp thread V, which has high stretch resistance, must be curved to a small curvature, and the large stretch resistance of the warp thread V acts as a force that pulls the winding hook F back in the opposite direction to its original rotation direction (left rotation direction in the figure). As a result, the winding hook F, which has reached the completed winding position (Figure 12(C)), does not return to the original winding standby position (Figure 12(A)), but is wound back in the counter-rotation direction (right rotation direction in the figure), resulting in a misalignment.

[0007] Thus, when attempting to form a frog-fork knot on warp threads made of thick, high-strength yarn using a conventional frog-fork knot knitting device, as shown in Figure 12(C), the winding hook F, which has completed the winding operation and reached the "winding completion position," may be returned to a position P2 that is slightly shifted in the counter-rotation direction (clockwise rotation direction in the illustration) from its original correct position P1. In this case, the winding hook F becomes misaligned from the front position of the engaging hook G, resulting in a state where the two members do not face each other. This prevents the engaging hook G from being inserted into the inner space of the winding hook F, leading to the problem of being unable to continue forming the frog-fork knot.

[0008] Therefore, the present invention aims to provide a frog-fork knotting netting device that can effectively form a frog-fork knot on netting yarn made of thick, high-strength yarn with a large outer diameter. [Means for solving the problem]

[0009] To achieve the above objective, the invention according to claim 1 comprises a winding hook having a winding guide portion that winds the warp threads in a loop shape by rotating from a winding standby position to a winding completion position, and an engaging hook that moves forward and backward in the radial direction of the rotation while facing the winding hook, wherein the tip portion of the engaging hook, which is inserted into the inner space of the winding guide portion through an opening in the winding guide portion, engages with a portion of the warp threads that have been wound in a loop shape multiple times on the winding guide portion by the rotation of the winding hook, and the engaging hook, which has engaged with a portion of the warp threads, detaches to the outside of the winding guide portion, thereby winding the warp threads In a frog-pronged net knitting device that forms a frog-pronged knot in the net fabric by pulling out a portion of the warp threads outward from the opening of the winding hook and passing the weft thread through the warp threads pulled outward and tightening them, the winding standby position of the winding hook is set to a position offset in the direction of rotation, corresponding to the winding angle at which the winding hook is wound back in the opposite direction of rotation due to the stretch resistance of the warp threads, and when the winding hook is in the winding completed position, the tip portion of the engaging hook faces the front position of the opening of the winding guide portion, and the winding guide portion is arranged to extend in the forward and backward direction of the engaging hook.

[0010] According to the invention of claim 1, which has such a configuration, when forming a frog-fork knot using warp threads made of thick, high-strength yarn with a large outer diameter and high resistance to elongation, when the winding hook, which has completed winding onto the winding hook and reached the winding completion position, is unwound in the counter-rotation direction due to the high elongation resistance of the warp threads, the offset angle of the winding hook, which is set in the rotation direction in accordance with the unwinding angle, cancels out the unwinding angle. As a result, the winding hook, which has reached the winding completion position, is set in the position where the winding guide portion extends in the forward and backward direction of the engaging hook, facing the originally intended normal position, i.e., the front position of the engaging hook, and the engaging hook can be smoothly inserted into the inner space of the winding hook, the next frog-fork knot forming process can be continued smoothly.

[0011] In particular, even when a portion of the warp threads is wrapped around the winding guide portion of the winding hook multiple times, that is, when a double frog-cross knot is formed or when the warp threads are wrapped around the winding hook three or more times, the frog-cross knot portion is formed smoothly.

[0012] In this case, as in the invention according to claim 2, when the warp threads are wound multiple times around the winding guide portion of the winding hook, it is desirable that the angle at which the warp threads are offset to the winding standby position is set to be larger as the number of windings of the warp threads increases.

[0013] According to the invention of claim 2 having such a configuration, the winding of warp threads multiple times, such as in a double frog-knot, is performed more effectively, and the quality of forming the frog-knot portion and the manufacturing efficiency are further improved.

[0014] Furthermore, as in the invention according to claim 3, it is desirable that the offset angle is proportional to the outer diameter of the warp threads.

[0015] According to the invention of claim 3 having such a configuration, the frog-fork knot portion is well formed for warp threads having various outer diameters. [Effects of the Invention]

[0016] As described above, the frog-fork knot knitting apparatus according to the present invention offsets the winding standby position of the winding hook in the direction of rotation to correspond to the unwinding angle of the winding hook due to the large stretch resistance of the warp threads made of thick, high-strength yarn, so that when the winding hook, which has completed winding and reached the winding completion position, is unwound in the counter-rotation direction due to the large stretch resistance of the warp threads, the offset angle of the winding hook set in correspondence with that unwinding angle cancels out the unwinding angle, and the winding hook, which has reached the winding completion position, is positioned facing the front position of the engaging hook, with the winding guide portion extending in the forward and backward direction of the engaging hook, and the winding hook is set in a position where the engaging hook can be smoothly inserted into the inner space of the winding hook, thereby enabling the next frog-fork knot forming process to continue smoothly. As a result, in the frog-fork knot formation process, which involves winding the warp threads multiple times, such as in a double frog-fork knot, the frog-fork knot can be formed well even on thick netting yarns with a large outer diameter. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic block diagram of a frog-fork knotting netting apparatus according to one embodiment of the present invention. [Figure 2] Figure 1 is an external perspective diagram showing a partially enlarged view of the knot section of the frog-fork knotting netting device, illustrating the state in which the winding hook is in the "winding standby position." [Figure 3] Figure 2 is an external perspective view diagram corresponding to Figure 2, showing the winding hook in a state where it has been driven to rotate from the "winding standby position" and has begun winding the warp threads. [Figure 4] Figure 3 is an external perspective view diagram, equivalent to Figure 2, illustrating the state in which the winding hook shown in Figure 3 has been rotated to the "winding completion position" and the winding of the warp threads has been completed. [Figure 5] This is an external perspective view diagram, equivalent to Figure 2, showing the state in which the engaging hook is inserted into the winding hook at the "winding completion position" shown in Figure 4, and the warp thread is engaged with the tip of the engaging hook. [Figure 6]It is an external perspective explanatory view corresponding to FIG. 2 showing a state in which the engaging key is moved outward from the winding key from the state shown in FIG. 5, and a part of the vertical yarn is pulled out outward from the winding key together with the engaging key. [Figure 7] It is an external perspective explanatory view corresponding to FIG. 2 showing a state in which the vertical yarn is released from the engaging key in the state shown in FIG. 6 and the vertical yarn is looped outside the penny. [Figure 8] It is an external perspective explanatory view corresponding to FIG. 2 showing a state in which the looped portion of the vertical yarn is slid forward of the penny and the vertical yarn is disposed under the horizontal yarn from the state shown in FIG. 7. [Figure 9] It is an external perspective explanatory view corresponding to FIG. 2 showing a state in which the winding key moves so as to incline upward rearward from the state shown in FIG. 8, disengages from the looped portion of the vertical yarn, and a knot is formed. [Figure 10] It is a plan explanatory view showing an enlarged view of the knot formed in the state shown in FIG. 9. [Figure 11] It schematically shows the process of winding the vertical yarn by the winding key of the frog or knot netting device according to the present invention. (A) is a plan explanatory view showing a state at the "winding standby position", (B) is a state at the "mid-winding position", and (C) is a state at the "winding completion position". [Figure 12] It schematically shows the process of winding the vertical yarn by the winding key of a general frog or knot netting device. (A) is a plan explanatory view showing a state at the "winding standby position", (B) is a state at the "mid-winding position", and (C) is a state at the "winding completion position". [Embodiments for Carrying Out the Invention]

[0018] Hereinafter, embodiments of the frog or knot netting device according to the present invention will be described in detail based on the drawings.

[0019] [Regarding the Overall Configuration] The frog-fork knotting netting apparatus 10 according to one embodiment of the present invention shown in Figure 1 comprises, in its schematic configuration, a warp thread supply unit 20, a weft thread supply unit 30, a knotting unit 40, a winding unit 50, and a drive control unit 60. Multiple knotting mechanism units (warp thread supply unit 20, weft thread supply unit 30, knotting unit 40) for knotting a single warp thread V and a weft thread W are arranged in parallel across multiple units. Multiple warp threads V and weft threads W are knotted simultaneously by these multiple knotting mechanism units, thereby manufacturing a net body N such as a fishing net in one go.

[0020] [Regarding the warp thread supply unit] The warp supply unit 20 is equipped with a bobbin 21 on which the warp threads V are wound. The warp threads V wound on the bobbin 21 are pulled out by the warp feeding mechanism 22 and supplied to the knotting unit 40 with appropriate tension applied by the tightening mechanism 23.

[0021] In this embodiment, the warp threads V are, for example, high-strength threads such as large-diameter Izanastowine (8 to 12 strands of 1600 denier thread bundled together) used in the sleeve portion and front of the net body of trawl fishing gear used in offshore bottom trawling vessels. Because warp threads V made of such large-diameter, high-strength threads have high resistance to stretching, it is difficult to curve them into a loop shape when forming a frog-cross knot, making it difficult to manufacture with conventional frog-cross knot netting devices.

[0022] [Regarding the weft yarn supply section] Furthermore, the weft supply unit 30 is equipped with a spool 31 having a substantially cylindrical frame around which the weft yarn W is wound, and the weft yarn W wound inside the spool 31 is supplied to the knotting unit 40 via a comb-shaped triangular blade 32.

[0023] [About the knot] Furthermore, the knotting section 40 includes a twill swing 41 that holds the warp thread V slidably from below, a winding hook 42 that winds the warp thread V that has passed through the twill swing 41, and an engaging hook 43 that engages with the warp thread V wound around the winding hook 42. These components work together to knot the warp thread V and the weft thread W in a predetermined shape. The specific knotting process will be described later.

[0024] [About the twill weave] The twill swing 41, which constitutes part of the knot 40 described above, is positioned on the front side (warp supply side) of the winding hook 42, as shown in Figure 2. The warp thread V, which is inserted through the through-hole 41a provided in the twill swing 41, is supplied toward the winding hook 42. The twill swing 41 is configured to move up, down, left, and right by a twill swing drive mechanism (not shown), and the warp thread V is swung in response to the movement of the winding hook 42, thereby winding onto the winding hook 42 as will be described later.

[0025] [About the key] The winding hook 42 comprises a rotating shaft portion 42a extending in a substantially vertical direction, and a winding guide portion 42b extending in a cantilevered manner in a substantially horizontal direction from the lower end of the rotating shaft portion 42a.

[0026] The rotating shaft portion 42a is rotated by a winding hook drive mechanism (not shown), and the winding guide portion 42b is rotated in the horizontal plane via the rotating shaft portion 42a, thereby winding the warp threads V onto the winding guide portion 42b as described later. The winding hook drive mechanism is also configured to tilt the entire winding hook 42 to a state inclined with respect to the horizontal plane (see Figure 9), and by tilting the winding hook 42 with this winding hook drive mechanism, the warp threads V wound around the winding guide portion 42b are released.

[0027] [About the winding guide section] On the other hand, as shown in Figures 2 and 3, the winding guide portion 42b has a saddle-shaped structure that extends in the radial direction of rotation with a roughly inverted U-shaped (arc-shaped) cross-section, and its cantilevered extension tip is claw-shaped. The inner space of the saddle-shaped structure in this winding guide portion 42b is an insertion hole 42c through which the engagement key 43, which will be described later, is inserted in a roughly horizontal direction. The engagement key 43, which will be described later, is inserted from the opening 42d of the insertion hole 42c provided on the rear end face of the winding key 42 in the "winding standby position" shown in Figure 2 towards the internal space of the insertion hole 42c.

[0028] The winding guide section 42b is then rotated around the aforementioned rotating shaft section 42a from the "winding standby position" shown in Figure 2 to the "winding completed position" shown in Figure 5. Along the way, as shown in Figure 3, a portion of the warp threads V are caught on the body of the winding guide section 42b. The warp threads V caught on the winding guide section 42b are then wound in a ring shape along the outer surface of the winding guide section 42b, forming a loop Vr of warp threads V as shown in Figure 4.

[0029] [About the engagement key] In contrast, the engagement hook 43 is formed from an elongated member that extends substantially horizontally on the rear side (weft supply side) of the winding hook 42 described above. When the engagement hook 43 is positioned in the correct position facing the front of the opening 42d of the insertion hole 42c provided in the winding guide portion 42b of the winding hook 42 (see Figure 11(C)), the engagement hook 43 and the insertion hole 42c of the winding guide portion 42b extend in a straight line in series. The engagement hook 43, in this series state with respect to the insertion hole 42c of the winding guide portion 42b, becomes insertable from the tip portion (front end portion) of the engagement hook 43 towards the inner space of the insertion hole 42c of the winding guide portion 42b through the opening 42d.

[0030] Here, the tip portion (front end portion) of the engagement hook 43 described above is provided with a hook portion 43a for hooking the warp thread V, and the base portion (rear end portion) of the engagement hook 43 on the opposite side is connected to a moving mechanism (not shown in the figure), and the entire engagement hook 43 is configured to reciprocate in an forward and backward motion relative to the winding hook 42 described above by the function of the moving mechanism.

[0031] In other words, when the engaging key 43 is advanced by the moving mechanism, as shown in Figure 5, the hook portion 43a provided at the tip (front end) of the engaging key 43 is inserted into the insertion hole 42c of the winding hook 42, which is in the aforementioned "winding standby position," from the opening 42d of the insertion hole 42c toward the inner space. At that time, the hook portion 43a of the engaging key 43 catches a part of the loop Vr of the warp thread V that is wound around the winding guide portion 42b as described above, and the hook portion 43a of the engaging key 43 is engaged with the warp thread V.

[0032] On the other hand, in the area (rear portion) where the engaging key 43 is retracted by the aforementioned moving mechanism, the coin holder 31 containing the weft thread W is positioned below, as shown in Figures 6 to 9. The key portion 43a of the retracted engaging key 43 is inclined at the lower rear of the coin holder 31, and as shown in Figure 7, it guides the warp thread V, which is engaged with the key portion 43a of the engaging key 43, to cover the outer side of the coin holder 31.

[0033] As mentioned above, in this embodiment, the warp thread V is a thick, high-strength, large-diameter thread with high stretch resistance. Therefore, when the warp thread V, which is wound along the outer surface of the winding guide portion 42b of the winding hook 42, is curved in an annular shape with a small curvature, the winding hook 42 is pulled in the opposite direction of rotation (clockwise rotation in a plan view) by the stretch resistance of the warp thread V itself. Then, due to the tensile force of the warp thread V, the winding hook 42 is unwound in the opposite direction to its original rotation (counterclockwise rotation in a plan view) (clockwise rotation in a plan view).

[0034] As shown in Figure 11(C), the unwinding angle (hereinafter referred to as "unwinding angle α") caused by the stretch resistance of the warp threads V, i.e., Izanastowine (a bundle of 8 to 12 strands of 1600 denier yarn), in this embodiment is specifically in the range of 13 to 17 degrees, with an average value of 15 degrees. Therefore, corresponding to the unwinding angle α of the winding hook 42, the "winding standby position" of the winding hook 42 shown in Figure 11(A) is offset in the rotational drive direction of the winding hook 42 (counterclockwise rotation in a plan view).

[0035] In other words, the winding hook 42's "winding standby position" is set to an offset angle of 15 degrees, which corresponds to the average value of the unwinding angle α due to the warp thread V mentioned above (hereinafter referred to as the "offset angle β"). The winding hook 42's "winding standby position" is set to a position that has been rotated forward by that offset angle β (15 degrees).

[0036] In this embodiment, the offset angle β of the winding hook 42 is set to 15 degrees, which is the average value of the unwinding angle of the winding hook 42. However, it is also possible to select and set a suitable angle within the range of the unwinding angle of the winding hook 42 (13 degrees to 17 degrees).

[0037] Furthermore, since the unwinding angle due to the stretch resistance of the warp thread V is proportional to the outer diameter of the warp thread V, it is desirable that the offset angle that determines the "winding standby position" of the winding hook 42 also be proportional to the outer diameter of the warp thread V. A range of 10 to 20 degrees is considered appropriate for the offset angle corresponding to the outer diameter of the warp thread of so-called thick threads.

[0038] As described above, the winding hook 42, which is in a "winding standby position" offset in the rotational direction corresponding to the unwinding angle by the warp thread V, specifically in the range of 10 to 20 degrees, or in this embodiment, 13 to 17 degrees, is driven to rotate in a counterclockwise direction (left rotation direction in the figure) in a substantially plane as shown in Figure 11(B). This causes the aforementioned loop Vr of the warp thread V to be formed on the winding guide portion 42b. The winding hook 24 then reaches the "winding completed position" shown in Figure 11(C) when winding is complete.

[0039] The winding hook 42, which is in the "winding completed position," will return to its original "winding standby position" as shown in Figure 11(A) if a warp thread of a typical, normal thickness is used. However, in the case of a warp thread V made of a thick, high-strength thread, as in this embodiment, the large stretch resistance of the warp thread V will cause it to unwind, as described above.

[0040] Therefore, in this embodiment, an offset angle corresponding to the rewinding angle in the counter-rotation direction (rightward rotation direction in the figure) is set at the "winding completion position" of the winding hook 42 shown in Figure 11(C). This offset angle cancels out the rewinding angle, so that the winding hook 42 is returned to its originally intended normal position. Specifically, when the winding hook 42 has completed winding and reached the "winding completion position," the opening 42d of the insertion opening 42c provided in the winding guide portion 42b faces the front position of the engaging key 43. In other words, the winding guide portion 42b of the winding hook 42 extends in the forward and backward direction of the engaging key 43. As a result, the "winding completion position" is set to be offset to a position where the engaging key 43 can be smoothly inserted into the inner space of the insertion opening 42c of the winding hook 42.

[0041] [About the winding mechanism] The winding section 50, located below the knotting section 40 having the above-described configuration, is configured to wind the net body N, formed by knotting the warp threads V and weft threads W in the knotting section 40, onto a winding roller 51 via a mesh feeding mechanism (not shown).

[0042] [Regarding the drive control unit] Here, the warp supply unit 20, weft supply unit 30, knotting unit 40, and winding unit 50, which have the configuration described above, are driven and controlled collectively by a common drive control unit 60. The warp feeding mechanism, stitch tightening mechanism, twill drive mechanism, winding hook drive mechanism, moving mechanism, and wide stitch feeding mechanism are connected to a drive source provided in the drive control unit 60, so that they are synchronized at appropriate timings.

[0043] In the frog-fork knot knitting device 10 having this configuration, the frog-fork knot operation is performed by the net-making method described below, and a frog-fork knot as shown in Figure 10 is formed as a knot between the warp threads V and the weft threads W, thereby manufacturing the net body N.

[0044] In other words, in the frog-fork knotting operation using the frog-fork knotting netting device 10 described above, the winding hook 42 is first set to the "winding standby position" as shown in Figure 2. The "winding standby position" of the winding hook 42 is set to a position offset by a rewinding angle of α° to β° in the direction of rotation of the warp thread V (counterclockwise rotation in a plan view), as shown in Figure 11(A).

[0045] Furthermore, the engaging hook 43, which is located on the rear side (weft supply side) of the winding hook 42, does not face the opening 42d of the insertion opening 42c of the winding hook 42, which is offset in the counter-rotation direction as described above, in the initial state when the manufacturing process begins.

[0046] Next, the winding hook 42, which is in the offset "winding standby position" as described above, is raised by the traverse swing 41, lifting the warp thread V. With the warp thread V in this lifted state, the winding hook 42 is rotated to the left in a plan view, as shown in Figure 3. As a result, the warp thread V is wound in a ring around the winding guide portion 42b of the winding hook 42, as shown in Figure 11(B). Then, as shown in Figure 4, when the winding hook 42 is rotated to the "winding completion position," a loop Vr of the warp thread V is formed around the winding guide portion 42b of the winding hook 42, as shown in Figure 11(C).

[0047] In this manner, when the loop Vr of the warp thread V is formed on the winding guide portion 42b of the winding hook 42, the large stretch resistance force of the warp thread V, which is made of thick, high-strength yarn, acts as a tensile force on the winding guide portion 42b of the winding hook 42. As a result, the winding guide portion 42b of the winding hook 42, which has been rotated to the "winding completion position," will unwind in the clockwise direction in a plan view.

[0048] However, the "winding standby position" of the winding hook 42 in this embodiment is set to a position that is shifted in the rotational direction by an offset angle corresponding to the unwinding angle α°~β° described above. Therefore, when the winding hook 42 has completed winding and reached the "winding completed position", the offset angle cancels out the unwinding angle, so that the winding guide portion 42b of the winding hook 42 and the engaging hook 43, as shown in Figure 11(C), are facing each other in a substantially straight line, that is, one end portion of the engaging hook 43 (the upper end portion in Figure 11) is facing the opening 42d of the winding guide portion 42b of the winding hook 42. The winding guide portion 42b of the winding hook 42 extends along the direction of forward and backward movement of the engaging hook 43 (the vertical direction in Figure 11).

[0049] In this way, the key portion 43a provided at one end of the engaging key 43 (the upper end portion in Figure 11) facing the front position of the opening 42d in the winding guide portion 42b of the winding key 42 is advanced toward the insertion hole 42c, which is the inner space of the winding guide portion 42b (upward in Figure 11), and the key portion 43a of the engaging key 43 is smoothly inserted into the insertion hole 42c of the winding key 42.

[0050] As a result, as shown in Figure 5, the hook portion 43a of the engaging hook 43 is inserted toward the inside of the loop Vr of the warp thread V that is wound around the winding guide portion 42b of the winding hook 42, and the action of the twill swing 41 causes the warp thread V to be hooked onto the hook portion 43a of the engaging hook 43.

[0051] Next, as shown in Figure 6, when the engaging hook 43 is retracted, the warp thread V hooked onto the hook portion 43a of the engaging hook 43 is pulled outwards from the winding hook 42. Here, because the shrinkage of the warp thread V varies depending on the influence of humidity, temperature, material, etc., an encoder is used to control the amount of warp thread V that is always pulled out by the engaging hook 43.

[0052] As described above, the warp thread V, which is pulled out to the outside of the winding hook 42, is in the shape of a loop, and the loop portion of the warp thread V is placed over the outside of the coin dispenser 31 from the outside and passed downwards, as shown in Figure 7. Then, at the lower rear of the coin dispenser 31, the warp thread V, which is hooked onto the hook portion 43a of the engaging hook 43, is released. The released warp thread V slides upward along the front edge of the boat-shaped 31a provided at the front of the coin dispenser 31, and as shown in Figure 8, enters below the weft thread W supplied from the coin dispenser 31 and is caught by the warp thread V.

[0053] Next, as shown in Figure 9, the winding hook 42 retracts to a position tilted backward, and as the winding hook 42 slips out from the loop-shaped portion of the warp thread V, a knot is formed as shown in Figure 10(A). Then, at this knot, the warp thread V is pulled by a tightening mechanism (not shown in the illustration), tightening it to a suitable degree, and a so-called tightening is performed, resulting in a frog-cross knot between the warp thread V and the weft thread W, as shown in Figure 10(B). The frog-cross knotting process is completed with these steps.

[0054] According to the frog-fork knot netting device 10 of this embodiment, which has such a configuration, when using thick netting thread V with a large outer diameter, for example, a high-tensile thread such as thick Izanastowine (8 to 12 strands of 1600 denier thread bundled together) used from the sleeve portion to the front of the main net of trawl fishing gear used in offshore bottom trawling vessels, when the winding hook 42, which has completed winding and reached the "winding completion position," is unwound in the opposite direction of rotation due to the large stretch resistance of the warp thread V, The offset angle of the winding hook 42, which is set in advance in the rotational direction in response to the rewinding angle, cancels out the rewinding angle, and the winding hook 42, having reached the "winding completion position," is set to its originally intended regular position, that is, facing the front position of the engaging hook 43, with the winding guide portion 42b extending in the forward and backward direction of the engaging hook 43, so that the engaging hook 43 can be smoothly inserted into the inner space of the winding hook 42, thereby allowing the next frog-prong joint forming process to continue smoothly.

[0055] Furthermore, by repeating the aforementioned frog-fork knotting action, the warp thread V is wrapped around the winding guide portion 42b of the winding hook 42 twice, making it possible to form a so-called double frog-fork knot well. Moreover, it is also possible to form multiple frog-fork knots by wrapping the warp thread V around the winding guide portion 42b of the winding hook 42 three or more times. And even when forming multiple frog-fork knots such as these double frog-fork knots, the frog-fork knot portion is formed smoothly according to the present invention.

[0056] The present inventors have described the invention in detail based on embodiments, but it goes without saying that these embodiments are not limited to the embodiments described above, and can be modified in various ways without departing from the spirit of the invention.

[0057] For example, when winding warp threads multiple times (in multiple rows) around the winding guide of a winding hook, it is conceivable to increase the offset angle relative to the winding standby position of the winding hook for each subsequent winding (row), corresponding to the increasing curvature of the warp threads as the number of windings (rows) increases. In other words, when performing double or more windings, it is desirable to set the offset angle to be larger as the number of windings (rows) of warp threads around the winding guide of the winding hook increases.

[0058] By adopting this configuration, the winding of warp threads over multiple stages, such as in double frog-fork knots, can be performed more effectively, further improving the quality of the frog-fork knot formation and the manufacturing efficiency.

[0059] Furthermore, in the embodiment described above, the winding hook 42 is set to an offset angle β equivalent to the unwinding angle α due to the warp thread V (β=α). However, depending on the bending properties of the warp thread V, it is also possible to set the offset angle β to be different from the unwinding angle α (β≠α). [Industrial applicability]

[0060] The present invention can be broadly applied to apparatus for manufacturing various types of netting other than fishing nets. [Explanation of symbols]

[0061] 10 Frogmata knotted netting device 20 Warp thread supply section 21 bobbins 22 Warp thread feeding mechanism 23. Tightening mechanism 30 Weft supply section 31 coins 32 Triangular blade 40 Node 41 Twill 41a Through hole Volume 42 Key 42a Rotating shaft 42b Winding guide section 42c Through hole 42d aperture 43 Engaging Key 43a Key part 50 Winding section 51 Winding roller 60 Drive control unit V warp threads VR Loop W (Weft) N net body

Claims

1. A winding hook having a winding guide section that rotates from a winding standby position to a winding completion position to wind the warp threads in a loop shape, The device comprises an engaging key that moves forward and backward in the radial direction of the rotation while facing the winding key, The tip of the engaging hook, which is inserted into the inner space of the winding guide through the opening of the winding guide, engages with a portion of the warp threads that have been wound in a loop multiple times around the winding guide by the rotation of the winding hook. In a frog-pronged net knitting device, the engaging hook, which is engaged with a portion of the warp thread, detaches from the winding guide portion, thereby pulling a portion of the warp thread outward from the opening of the winding hook, and passing a weft thread through the warp thread pulled outward and tightening it to form a frog-pronged knot in the net fabric, The winding standby position of the winding hook is set to a position offset at an angle in the direction of rotation, corresponding to the unwinding angle at which the winding hook is unwound in the opposite direction of rotation due to the stretch resistance of the warp threads. A frog-fork knotting netting device for a net body, characterized in that, when the winding hook is in the winding completion position, the tip of the engaging hook faces the front position of the opening of the winding guide portion, and the winding guide portion is arranged to extend in the forward and backward direction of the engaging hook.

2. When the warp threads are wound multiple times around the winding guide portion of the winding hook, The frog-fork knotting netting apparatus for a net body according to claim 2, characterized in that the angle offset to the winding standby position is set to be larger as the number of windings of the warp threads increases.

3. The frog-knot knitting net apparatus for a net body according to claim 1, 2, or 3, characterized in that the offset angle is proportional to the outer diameter of the warp threads.

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