Sliding bearing and fishing machine equipped with sliding bearing

Abstract

To provide a slide bearing which enables easy aligning of a rotary shaft, prevents partial wear, and achieves the long life, and to provide an angling machine including the slide bearing.SOLUTION: A slide bearing includes: a first member which has a through hole and includes a first recessed spherical surface part formed at one end of the through hole; a second member which has a through hole, includes a second recessed spherical surface part formed at one end of the through hole, and can be fixed to the first member so that the second recessed spherical surface part faces the first recessed spherical surface part of the first member; a ball bearing which has a through circular hole formed in an axial direction and has a protruding spherical surface part, which corresponds to the first recessed spherical surface part and the second recessed spherical surface part, on its outer peripheral surface; and a resin bush which has a shaft hole, into which a rotary shaft is inserted, and is inserted and fitted into the through circular hole of the ball bearing in a detachable manner. The ball bearing is fastened between the first member and the second member in a state that the protruding spherical surface part of the ball bearing slidably contacts with the first recessed spherical surface part of the first member and the second recessed spherical surface part of the second member.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a sliding bearing in which a rotating shaft is capable of reciprocating in the axial direction, and to a fishing machine equipped with this sliding bearing. [Background technology]

[0002] A fishing machine for catching fish such as squid is known, which is mounted on a boat and includes a rotating drum for winding in and out a fishing line, a drive motor for driving the rotating drum, and a control mechanism for controlling the rotation speed of the drive motor (see, for example, Patent Document 1). The rotating drum of such a fishing machine is made up of, for example, a lattice structure with multiple bridge girders stretched between two side plates mounted parallel to each other on both ends of the rotating shaft, and the fishing line is wound around the outer periphery of the multiple bridge girders of the rotating drum.

[0003] Figure 8 shows a schematic diagram of the structure of winding the fishing line in the squid fishing machine, Figure 9 shows a schematic diagram of the manner in which the fishing line is wound in this squid fishing machine, Figure 10 shows a schematic diagram of the structure of the sliding bearing in a conventional squid fishing machine, Figure 11 shows a schematic diagram of the winding down operation of the rotating drum in the squid fishing machine, and Figure 12 shows the operation of the fishing line from multiple squid fishing machines.

[0004] As shown in Figure 8, the squid fishing machine 1 winds up and down the fishing line 5 wound around the rotary drum 3 by rotating the rotary drum 3 connected to the rotary shaft 2 in forward and reverse directions. A sinker 7 is attached to the tip of the fishing line 5, and multiple fishhooks 6 are attached to the middle of the line. In order to pay out (wind down) these fishhooks 6 into the sea without tangling them, it is important that the fishing line 5 is wound evenly around the rotary drum 3 as shown in Figure 9(A), without overlapping as shown in Figure 9(B).

[0005] For this reason, many squid fishing machines are equipped with a "level winding function." The "level winding function" is achieved by simultaneously rotating the rotating drum 3 to wind up and down the fishing line 5 and moving the rotating drum 3 back and forth from side to side to prevent the fishing line 5 from being wound in the same position. As shown in Figure 10, the bearing used to achieve this "level winding function" is not a typical bearing support bearing, but a sliding bearing 4 made of resin and with a structure that allows it to slide in the axial direction.

[0006] However, due to its structure, this type of sliding bearing 4 inevitably wears out, and when wear occurs, it can cause problems such as poor sliding of the rotating shaft 2. As shown in Figure 11, the squid fishing machine 1 is configured so that when reeling in the fishing line, the electric motor is used to reel in the fishing line, but when reeling in the line, the motor is rotated in the opposite direction, but to prevent accidents, a one-way clutch within the motor causes the drum to spin freely, and the fishing line 5 is lowered only by the weight of the sinker 7 attached to the end of the fishing line. For this reason, if the sliding of the rotating shaft 2 deteriorates, the fishing line 5 will not be lowered, or will be lowered slowly.

[0007] If the fishing line 5 does not go down or goes down too slowly, problems will arise when performing "sequential operation," a cooperative control method on squid fishing boats. "Sequential operation" is a technique used on fishing boats equipped with multiple squid fishing machines 1 to prevent the fishing lines from getting tangled and to catch schools of squid in succession so as not to let them escape. It is a well-known operating method in which the squid fishing machines 1 are operated one by one in sequence, with the reeling-up / reeling-down operations delayed by a certain amount of time. Figure 12(A) shows the case where sequential operation is performed, and Figure 12(B) shows the case where sequential operation is not performed.

[0008] During this sequential operation, if a squid fishing machine 1 occurs that is slow to lower the fishing line 5, the operation timing will begin to differ from the other squid fishing machines 1, eventually causing the line to become tangled or forcing the entire system to stop while waiting for its turn. In particular, when line tangles occur, not only does operation have to be stopped, but recovery also requires a great deal of effort and time, so there has long been a need for improvements in measures to prevent wear on the sliding bearings 4. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-273646 Summary of the Invention [Problem to be solved by the invention]

[0010] However, since the squid fishing machine 1 is designed with an emphasis on reliability under harsh usage conditions, it does not have a high-precision main frame and is simply made with a box-shaped frame, so the installation position of the sliding bearing 4, which requires precision, must be manually adjusted for each machine.

[0011] Figure 13 provides a general explanation of a method for correcting distortion of a squid fishing machine frame, Figure 14 provides a general explanation of the clearance of a resin bush, and Figure 15 provides a general explanation of the relationship between the clearance of a resin bush and the surface pressure.

[0012] As shown in Figure 13, conventionally, the sides of the box-shaped frame to which the sliding bearing 4 is fixed may not be parallel due to distortion caused by welding strain, etc., so it was necessary to center the sliding bearing 4 by correcting the shape of the box-shaped frame by hitting it with a hammer, etc.

[0013] However, adjustments on the order of millimeters or degrees are difficult, and perfect centering is not always possible. For this reason, as shown in Figure 14(A), there are cases where the bearing has to be used with the angle misaligned, resulting in high rotational resistance of the rotating shaft 2. To avoid this situation, the conventional solution has been to widen the inner diameter of the resin bushing attached to the inner periphery of the sliding bearing 4, as shown in Figure 14(B).

[0014] However, as shown in Figure 15, increasing the inner diameter of the resin bushing not only makes it more susceptible to uneven wear of the resin bushing, but also increases the surface pressure, which may exceed the sliding property evaluation value (PV value) of the resin bushing material. In this case, wear of the resin bushing will progress, and the lifespan of the sliding bearing 4 will be significantly shortened.

[0015] The sliding performance evaluation value (PV value) is calculated by multiplying P (surface pressure on the sliding surface) by V (velocity of the sliding surface). The unit of PV value is "kgf / cm 2 ·m / min".

[0016] The present invention is intended to solve the above-mentioned problems of the prior art, and its purpose is to provide a sliding bearing that allows for easy alignment of the rotating shaft, prevents uneven wear, and achieves a long life, as well as a fishing machine equipped with this sliding bearing. [Means for solving the problem]

[0017] According to the present invention, a sliding bearing that supports a rotating shaft so that it can slide in the axial direction comprises: a first member having a through hole and a first concave spherical portion formed at one end of the through hole; a second member having a through hole and a second concave spherical portion formed at one end of the through hole and fixable to the first member so that the second concave spherical portion faces the first concave spherical portion of the first member; a ball bearing having an axial circular through hole and having convex spherical portions on its outer circumferential surface that correspond to the first and second concave spherical portions; and a resin bushing having a shaft hole through which the rotating shaft is inserted and removably inserted into the circular through hole of the ball bearing. The ball bearing is fastened between the first member and the second member with the convex spherical portion of the ball bearing in sliding contact with the first concave spherical portion of the first member and the second concave spherical portion of the second member.

[0018] In the sliding bearing, the ball bearing is fastened between the first member and the second member with the convex spherical portion of the ball bearing in sliding contact with the first concave spherical portion of the first member and the second concave spherical portion of the second member. A resin bushing is detachably inserted into the through-hole of the ball bearing, so that when aligning the rotating shaft, once alignment is confirmed, the first member and the second member are fastened together with, for example, a bolt, thereby fixing movement between the convex spherical portion of the ball bearing and the first concave spherical portion of the first member and the second concave spherical portion of the second member. This makes it easy to align the rotating shaft, prevents uneven wear of the resin bushing, and achieves a long life.

[0019] The through hole of the ball bearing has a small diameter portion and a large diameter portion, each of which is cylindrical and connected to each other, and it is preferable that the outer surface of the resin bushing has a small diameter portion and a large diameter portion corresponding to the small diameter portion and the large diameter portion of the through hole, respectively.

[0020] The resin bushing is preferably configured so as to be slidable in the axial direction when the rotary shaft is inserted into the shaft hole.

[0021] According to the present invention, a fishing machine includes a rotating drum that winds fishing line and is attached to a rotating shaft and rotatable in a winding-up direction and a winding-up direction, a drive motor that drives the rotating drum in the winding-up direction or the winding-up direction, a movement drive mechanism that moves the rotating shaft back and forth in the axial direction, and a sliding bearing that supports the rotating shaft so that it can slide in the axial direction. The sliding bearing includes a first member having a through hole and a first concave spherical portion formed at one end of the through hole, a second member having a through hole and a second concave spherical portion formed at one end of the through hole and that can be fixed to the first member so that the second concave spherical portion faces the first concave spherical portion of the first member, a ball bearing having an axial through hole and convex spherical portions on its outer circumferential surface that correspond to the first and second concave spherical portions, and a resin bushing having a shaft hole through which the rotating shaft is inserted and that is detachably inserted into the through hole of the ball bearing. The ball bearing is fastened between the first member and the second member with the convex spherical portion of the ball bearing in sliding contact with the first concave spherical portion of the first member and the second concave spherical portion of the second member.

[0022] In a fishing machine, the through hole of the ball bearing of the sliding bearing has a small diameter portion and a large diameter portion, and the small diameter portion and the large diameter portion are each cylindrically configured and connected to each other, and it is preferable that the outer surface of the resin bush has small diameter portions and large diameter portions that respectively correspond to the small diameter portion and the large diameter portion of the through hole.

[0023] In the fishing machine, it is preferable that the resin bush of the sliding bearing is configured to be slidable in the axial direction when the rotating shaft is inserted into the shaft hole. [Effects of the Invention]

[0024] According to the present invention, in the sliding bearing, the ball bearing is fastened between the first member and the second member with the convex spherical portion of the ball bearing in sliding contact with the first concave spherical portion of the first member and the second concave spherical portion of the second member. The resin bushing is detachably inserted into the through-hole of the ball bearing, so that when aligning the rotating shaft, once alignment is confirmed, the first member and the second member are fastened together with, for example, a bolt, thereby fixing movement between the convex spherical portion of the ball bearing and the first concave spherical portion of the first member and the second concave spherical portion of the second member. This facilitates alignment of the rotating shaft, prevents uneven wear of the resin bushing, and achieves a longer life. [Brief explanation of the drawings]

[0025] [Figure 1] 1A and 1B are a front view and a side view, respectively, showing a schematic configuration of a squid fishing machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view schematically showing the internal structure of the squid fishing machine of FIG. 1. [Figure 3] FIG. 2 is a block diagram showing an outline of the electrical configuration of the squid fishing machine of FIG. 1. [Figure 4] FIG. 2 is an exploded perspective view schematically showing the configuration of a sliding bearing in the squid fishing machine of FIG. 1. [Figure 5] FIG. 5 is a local cross-sectional perspective view showing, in an assembled state, the internal structure of the sliding bearing of FIG. 4. [Figure 6] 5A and 5B are cross-sectional views schematically showing the state of use of the sliding bearing of FIG. 4, in which (A) is the state before fixing, and (B) is the state after fixing. [Figure 7] 10 is a diagram schematically showing the relationship between the inner diameter of a resin bush and the surface pressure. FIG. [Figure 8] FIG. 1 is a diagram illustrating a schematic configuration for winding a fishing line in a squid fishing machine. [Figure 9] 1 is a diagram for explaining the outline of how the fishing line is wound up in this squid fishing machine. FIG. [Figure 10] FIG. 10 is a cross-sectional view schematically showing the structure of a sliding bearing in a conventional squid fishing machine. [Figure 11] 1 is a diagram illustrating the winding-down operation of a rotating drum in a squid fishing machine. FIG. [Figure 12] FIG. 10 is a diagram illustrating the movement of fishing lines from multiple squid fishing machines. [Figure 13] 10 is a diagram for explaining a method for correcting distortion of the squid fishing machine frame. [Figure 14] 10A and 10B are diagrams for explaining the clearance of a resin bushing. [Figure 15] 10A and 10B are diagrams for explaining the relationship between the clearance and the surface pressure of a resin bushing. DETAILED DESCRIPTION OF THE INVENTION

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a sliding bearing and a fishing machine according to the present invention will be described with reference to the drawings.

[0027] Fig. 1 shows the overall configuration of a squid fishing machine 100 according to one embodiment of the present invention, with Fig. 1(A) being a front view of the squid fishing machine 100 and Fig. 1(B) being a front view of the squid fishing machine 100. Fig. 2 shows the internal structure of the squid fishing machine main body 10, and Fig. 3 shows the electrical structure of the squid fishing machine 100. Fig. 4 shows the structure of a sliding bearing 40 in the squid fishing machine 100, and Fig. 5 shows the assembled state and internal structure of the sliding bearing 40. Fig. 6 schematically shows the state of use of the sliding bearing 40, with Fig. 6(A) showing the state before fixing and Fig. 6(B) showing the state after fixing.

[0028] As shown in Fig. 1, the squid fishing machine 100 according to this embodiment includes a fishing machine main body 10, a rotating shaft 20 rotatably mounted on the fishing machine main body 10, a pair of rotating drums 30 attached to the rotating shaft 20 on both sides of the fishing machine main body 10, and a pair of sliding bearings 40 supporting the rotating shaft 20 so that it can slide in the axial direction. A pair of fishing lines 50 is wound around each of the pair of rotating drums 30, and a plurality of fishhooks 60 are attached to each of the pair of fishing lines 50. A pair of sinkers 70 is attached to the lower ends of each of the pair of fishing lines 50.

[0029] As shown in Figures 1 and 2, the fishing machine main body 10 comprises a housing 11, a drive motor 12 arranged inside the housing 11 and driving the rotating shaft 20 to rotate, an electromagnetic clutch 13 that transmits the rotation of the drive motor 12 to the rotating shaft 20, a rotation detector (rotation detection means) 14 that detects the rotation speed and direction of the rotating shaft 20 and therefore the rotating drum 30, a control unit 15 that controls the drive motor 12 and the electromagnetic clutch 13 based on the detection results of the rotation detector 14, and a moving drive mechanism (a swing mechanism, a level wind mechanism) 16 that moves the rotating shaft 20 and therefore the rotating drum 30 back and forth in the axial direction.

[0030] As shown in FIG. 1(A), an operation panel of the control unit 15 is attached to the front of the housing 11, and this operation panel is provided with an input unit 15a, a display unit 15b, a power switch, etc. of the control unit 15.

[0031] 2, the drive motor 12 is installed in the lower part of the housing 11, and the driving force of the drive motor 12 is transmitted to the rotary shaft 20 via a first transmission mechanism 17a consisting of meshed gears, an electromagnetic clutch 13, and a second transmission mechanism 17b consisting of meshed gears. The rotation detector 14 is connected to the drive shaft 19 via a third transmission mechanism 17c consisting of a chain and sprockets.

[0032] The electromagnetic clutch 13 is a clutch that turns on and off the transmission of power by means of an electromagnetic force generated by energizing a coil, and various known configurations can be applied.

[0033] The rotation detector 14 is a rotary encoder that detects the rotation speed and direction of the rotary shaft 20 and therefore the rotary drum 30 .

[0034] As shown in FIG. 3, the control unit 15 includes an input unit 15a consisting of a keyboard or a liquid crystal touch panel or the like, a display unit 15b consisting of a liquid crystal display or a liquid crystal touch panel or the like, a CPU 15c, a ROM 15d, a RAM 15e, a rotation speed calculation means 15f that calculates the rotation speed of the rotating shaft 20 and therefore the rotating drum 30 from the output signal of the rotation detector 14, a rotation direction determination means 15g that determines the rotation direction of the rotating drum 30, i.e., whether the rotating drum 30 is rotating in the winding direction (forward rotation) or the winding down direction (reverse rotation), from the output signal of the rotation detector 14, and a rotation direction determination means When it is determined by stage 15g that the rotating drum 30 has started rotating in the winding-down direction, the apparatus is provided with: applied voltage change calculation means 15h which calculates the change in the applied voltage to the electromagnetic clutch 13 required to maintain the rotation speed at a predetermined rotation speed based on the rotation speed obtained from the rotation speed calculation means 15f; applied voltage adjustment means 15i which adjusts the applied voltage by increasing or decreasing the change in the applied voltage calculated by the applied voltage change calculation means 15h relative to a preset applied voltage; and payout distance calculation means 15j which calculates the distance of fishing line paid out per unit time.

[0035] The CPU 15c controls the overall operation of the fishing machine 100 in accordance with a control program stored in the ROM 15d while using the RAM 15e as a work area.

[0036] The applied voltage change calculation means 15h is configured to calculate, when it is determined that the rotating drum 30 has started rotating in reverse, the change in the applied voltage to the electromagnetic clutch 13 that is required to maintain the fishing line winding speed at a predetermined value, based on the obtained rotational speed. For example, the applied voltage change calculation means 15h is configured to calculate the change in the applied voltage to the electromagnetic clutch 13 as the product of the rotational speed obtained from the rotational speed calculation means 15f and a predetermined constant corresponding to this rotational speed.

[0037] The applied voltage adjusting means 15i applies to the electromagnetic clutch 13 an applied voltage obtained by adding or subtracting the applied voltage change calculated by the applied voltage change calculating means 15h to a predetermined voltage setting value (or hoisting force setting value) for driving the electromagnetic clutch 13.

[0038] The reeling distance calculation means 15j is configured to calculate the distance of the fishing line reeled out per unit time based on the detection result of the rotation detector 14 when the rotating drum rotates in the reeling down direction.

[0039] When the rotation direction determination means 15g determines that the rotating drum 30 is rotating in the lowering direction and the rotation speed obtained from the rotation speed calculation means 15f is less than a predetermined rotation speed, the control unit 15 controls the drive motor 12 to drive the rotating drum 30 in the lowering direction, and when the rotation speed of the rotating drum 30 becomes equal to or greater than the predetermined rotation speed, the control unit 15 controls the drive motor 12 to stop. Furthermore, when the control unit 15 determines that the rotating drum 30 is rotating in the lowering direction and the rotation speed of the rotating drum 30 is less than the predetermined rotation speed, the control unit 15 controls the electromagnetic clutch 13 to be engaged, and when the rotation speed of the rotating drum 30 becomes equal to or greater than the predetermined rotation speed, the control unit 15 controls the electromagnetic clutch 13 to be disengaged.

[0040] Furthermore, the control unit 15 can automatically set the engagement torque of the electromagnetic clutch 13 to the engagement torque for the clutch assist operation mode. The engagement torque for the clutch assist operation mode can be set automatically by the control unit 15 as described below, or manually by an operator. When set manually, the engagement torque of the electromagnetic clutch 13 is gradually increased from zero while the drive motor 12 is rotating so that the rotating drum 30 rotates in the unwinding direction, and the torque value when the rotating drum 30 begins to rotate is set in the electromagnetic clutch 13 as the engagement torque for the clutch assist operation mode.

[0041] The moving drive mechanism 16 is configured to rotate the rotating shaft 20 while reciprocating in the axial direction as a swing mechanism. The moving drive mechanism 16 is driven to rotate by the drive motor 12 via a first transmission mechanism 17a and a second transmission mechanism 17b. The moving drive mechanism 16 includes a drive shaft 19 arranged parallel to the rotating shaft 20, a spiral groove 18a provided on the surface of the drive shaft 19 and reciprocating in the axial direction of the drive shaft 19, and a claw member 18b attached to the rotating shaft 20 of the rotating drum 30, immovably attached to the rotating shaft 20 in the axial direction of the rotating shaft 20, fitted into the spiral groove 18a, and guided along the spiral groove 18a as the drive shaft 19 rotates. The adoption of this moving drive mechanism 16 prevents the fishing line 40 from becoming too concentrated (overwound) and prevents the fishhooks 60 from becoming tangled. It also prevents inaccurate calculation of the reel length due to changes in the diameter of the reeled portion.

[0042] 1 and 2, the rotating shaft 20 is inserted through the housing 11 of the fishing machine main body 10. The rotating shaft 20 is supported by a pair of sliding bearings 40 so as to be slidable in the axial direction. A rotating drum 30 is attached to each end of the rotating shaft 20.

[0043] In this embodiment, the rotating drum 30 is a drum in which the axial cross section of the winding section 31 around which the fishing line 50 is wound is formed in a circular shape. The rotating drum 30 is rotated in an appropriate direction by the fishing machine main body 10, thereby winding up or unwinding the fishing line 40. A fishing hook 60 with an artificial bait such as a branch hook or a connecting hook is attached to the fishing line 50. A sinker 70 is also attached to the tip of the fishing line 50.

[0044] As shown in Figures 4 and 5, each sliding bearing 40 includes a first member 41, a second member 42, a ball bearing 43, and a resin bushing 44 having an axial hole through which the rotating shaft 20 is inserted.

[0045] The first member 41 has a through hole 41a, and a first concave spherical portion 41b is formed at one end of the through hole 41a. The first member 41 is preferably made of a rigid metal (for example, iron, stainless steel, copper, etc.).

[0046] The second member 42 has a through hole 42a, and a second concave spherical portion 42b is formed at one end of the through hole 42a. The second member 42 is configured so that the second concave spherical portion 42b faces the first concave spherical portion 41b of the first member 41, allowing it to be fixed to the first member 41. The second member 42 is preferably made of a rigid metal (for example, iron, stainless steel, copper, etc.).

[0047] The ball bearing 43 has a convex spherical portion 43a on its outer circumferential surface and an axial circular through-hole 43b at its center. The convex spherical portion 43a is formed to correspond to the first concave spherical portion 41b of the first member 41 and the second concave spherical portion 42b of the second member 42. In this embodiment, the circular through-hole 43b has a small-diameter portion 43b1 and a large-diameter portion 43b2, which are each cylindrical and connected to each other. The ball bearing 43 is preferably made of a rigid metal (e.g., iron, stainless steel, copper, etc.).

[0048] Resin bushing 44 is detachably inserted into circular through-hole 43b of ball bearing 43. The outer circumferential surface of this resin bushing 44 has small diameter portion 44b1 and large diameter portion 44b2 that respectively correspond to small diameter portion 43b1 and large diameter portion 43b2 of circular through-hole 43b of ball bearing 43. It is desirable that resin bushing 44 be made of a material with high wear resistance, but the optimum resin material will vary depending on the material of rotating shaft 20, the magnitude of the load, the rotational speed, etc., so it is necessary to select a material that suits the conditions.

[0049] The difference in the contact pressure between the rotating shaft 20 and the resin bushing 44 due to differences in the inner diameter of the resin bushing 44 is shown in Figure 7, where the rotating shaft 20 has a diameter of φ30 mm and is made of SUS304. As shown in Figure 7, the contact pressure improves by 10% or more for every 0.1 mm change in the inner diameter of the resin bushing 44, so it is believed that a reduction in the inner diameter can be fully expected to extend the lifespan.

[0050] As described above, in the sliding bearing 40, the outer peripheral surface of the ball bearing 43 is ball-shaped (convex spherical portion 43a). When aligning the rotating shaft 20, once alignment is confirmed, the first member 41 and the second member 42 are fastened with bolts or the like to fasten the ball bearing 43 and fix its movement. The ball bearing 43 is fixed by providing a gap between the first member 41 and the second member 42 while the first member 41 and the second member 42 are in close contact with the ball bearing 43, and then finally fastening the ball bearing 43 with the bolts by friction between the spherical surfaces generated when the balls are fastened. This prevents the automatic alignment function from functioning when the squid fishing machine 100 is in operation. The reason for this is that the squid fishing machine 100 has a simple device structure and does not have any structure other than the sliding bearing 40 to support the rotating shaft 20. Therefore, if the sliding bearing 40 were free, the rotation of the rotating drum 30 of the squid fishing machine 100 would become unstable (wobble would occur).

[0051] Since the sliding bearing 40 can be centered, there is no need to ensure an excessively large clearance, and a smaller, more appropriate clearance can be set, which is expected to extend the life of the sliding bearing 40.

[0052] Furthermore, by making the centering work easier, not only can the work time be shortened and differences in the finished product due to differences in the operator be eliminated, but if the differences in the finished product between each of the squid fishing machines 100 are eliminated, it can also be expected that the control accuracy during "sequential operation" will be improved.

[0053] Furthermore, with conventional sliding bearings, the adjusted state at the time of shipment from the factory is the most centered and it is impossible to readjust them on board, whereas with the sliding bearing 40 of the present invention, if distortion occurs in the box-shaped frame (housing 11) of the fishing machine main body 10 after the squid fishing machine 100 is installed on board, it is possible to correct the misalignment of the sliding bearing 40 on site by loosening the bolts of the sliding bearing 40 and then retighten them.

[0054] As described above, the squid fishing machine 100 of this embodiment includes the fishing machine main body 10, the rotating shaft 20, a pair of rotating drums 30, and a pair of sliding bearings 40 that support the rotating shaft 20 slidably in the axial direction. Each sliding bearing 40 has a first member 41, a second member 42, a ball bearing 43, and an axial hole through which the rotating shaft 20 is inserted, and includes a resin bushing 44. The ball bearing 43 is fastened and fixed between the first member 41 and the second member 42 with the convex spherical portion 43a of the ball bearing 43 in sliding contact with the first concave spherical portion 41b of the first member 41 and the second concave spherical portion 42b of the second member 42.

[0055] As a result, when aligning the rotating shaft 20, once the alignment is confirmed, the first member 41 and the second member 42 are tightened to fix the movement between the convex spherical portion of the ball bearing 43 and the first concave spherical portion 41b and the second concave spherical portion 42b of the first member 41 and the second member 42, making it easy to align the rotating shaft 20 and preventing uneven wear of the resin bushing 44, thereby achieving a longer lifespan.

[0056] In the sliding bearing 40 of the above-described embodiment, an example has been described in which the circular through hole 43b of the ball bearing 43 has a small diameter portion 43b1 and a large diameter portion 43b2, and the outer peripheral surface of the resin bushing 44 has also a small diameter portion 43b1 and a large diameter portion 43b2, but the present invention is not limited to this. For example, it is also possible to provide a flange portion on the outer periphery of one end of the resin bushing without providing a step in the circular through hole of the ball bearing.

[0057] In the above embodiment, the squid fishing machine 100 has been described as an example, but the present invention is not limited to this. The present invention can also be applied to fishing machines that are mounted on ships and used to catch other fish species.

[0058] The present invention is not limited to the above-described embodiments, and its technical scope includes various modified design forms within the scope that do not deviate from the gist of the invention described in the claims. [Industrial Applicability]

[0059] INDUSTRIAL APPLICABILITY The present invention can be used in a fishing machine for catching fish such as squid, which is mounted on a ship and has a rotating drum for reeling in and reeling in a fishing line. [Explanation of symbols]

[0060] 1.100 squid fishing machine 2, 20 Rotation axis 3, 30 rotating drum 4, 40 Sliding bearings 5, 50 fishing line 6, 60 Fishing Hooks 7, 70 weights 10 Fishing machine body 11 Housing 12 Drive motor 13 Electromagnetic clutch 14 Rotation detector 15 Control Unit 15a Input section 15b Display section 15c CPU 15d ROM 15e RAM 15f Rotational speed calculation means 15g Rotation direction detection means 15h Applied voltage change calculation method 15i Applied voltage adjustment means 15j Payout distance calculation method 16. Movement drive mechanism 17a First transmission mechanism 17b Second transmission mechanism 17c chain 18a spiral groove 18b Claw member 19 Drive shaft 41 First member 41a, 42a through hole 41b First concave spherical portion 42b Second concave spherical portion 42 Second member 43 Ball bearings 43a Convex spherical part 43b Through hole 43b1, 44b1 small diameter part 43b2, 44b2 large diameter section 44 Resin bushing

Claims

1. A sliding bearing that supports a rotating shaft so that it can slide in the axial direction, a first member having a through hole and a first concave spherical portion formed at one end of the through hole; A through hole is formed at one end of the through hole, and the second concave spherical portion is a second member fixable to the first member so as to face the first concave spherical surface portion of the first member; Two members, a through hole in the axial direction, and a first concave spherical portion and a second concave spherical portion on an outer circumferential surface thereof; a ball bearing having a corresponding convex spherical surface; The rotary shaft has a shaft hole through which the rotary shaft is inserted, and the rotary shaft is detachably inserted into the through-hole of the ball bearing. and a resin bushing attached to the bearing, The resin bushing supports the rotary shaft so that it can slide in the axial direction and also receives a load. It is composed of The through hole of the ball bearing has a small diameter portion and a large diameter portion, and the small diameter portion and the large diameter portion are each cylindrically configured and connected to each other, The outer circumferential surface of the resin bushing is fitted to the small diameter portion and the large diameter portion of the through hole. having corresponding smaller and larger diameter portions; The ball bearing is configured to fit the convex spherical portion of the ball bearing into the first concave portion of the first member. a sliding bearing fastened between the first member and the second member in a state in which the first member is in sliding contact with the second concave spherical surface portion of the first member and the second concave spherical surface portion of the second member.

2. It is rotatably provided so as to pass through the housing of the fishing machine body, and has a rotating door at each end. A rotating shaft on which a ram is mounted, and a fishing line is wound and attached to the rotating shaft in the winding down direction and the a rotating drum that can rotate in the winding-up direction and the winding-down direction, and a rotating drum that can drive the rotating drum in the winding-down direction or the winding-up direction. a drive motor for driving the rotary shaft; a movement drive mechanism for reciprocating the rotary shaft in the axial direction; a pair of sliding bearings that support the bearing so as to be slidable in the axial direction; Each of the sliding bearings is a first member having a through hole and a first concave spherical portion formed at one end of the through hole; A through hole is formed at one end of the through hole, and the second concave spherical portion is a second member fixable to the first member so as to face the first concave spherical surface portion of the first member; Two members, a through hole in the axial direction, and a first concave spherical portion and a second concave spherical portion on an outer circumferential surface thereof; a ball bearing having a corresponding convex spherical surface; The rotary shaft has a shaft hole through which the rotary shaft is inserted, and the rotary shaft is detachably inserted into the through-hole of the ball bearing. and a resin bushing attached to the bearing, The resin bushing supports the rotary shaft so that it can slide in the axial direction and also receives a load. It is composed of The through hole of the ball bearing has a small diameter portion and a large diameter portion, and the small diameter portion and the large diameter portion are each cylindrically configured and connected to each other, The outer circumferential surface of the resin bushing is fitted to the small diameter portion and the large diameter portion of the through hole. having corresponding smaller and larger diameter portions; The ball bearing is configured to fit the convex spherical portion of the ball bearing into the first concave portion of the first member. a first member and a second member fastened together with the first member and the second member in sliding contact with the first concave spherical surface portion of the first member and the second concave spherical surface portion of the second member.

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