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A snap ring for coupling a purse line to a purse seine includes a frame, a plurality of rollers, a frame opening, and a locking unit. The frame is connected to the purse seine. The purse line passes through a second end of the frame. The rollers are rotatably provided in the frame at positions at wh

A snap ring for coupling a purse line to a purse seine includes a frame, a plurality of rollers, a frame opening, and a locking unit. The frame is connected to the purse seine. The purse line passes through a second end of the frame. The rollers are rotatably provided in the frame at positions at which the purse line is brought into contact with the frame. The frame opening is formed in one side part of opposite side parts of the frame to open the frame. The locking unit is coupled to the frame to openably close the frame opening. The locking unit includes a first cylinder which is hinged at a first end thereof to the part of the frame which corresponds to a first end of the frame opening.

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1. A snap ring for coupling a purse line to a purse seine, comprising: a frame having a first end connected to the purse seine and a second end through which the purse line passes;a plurality of rollers rotatably provided in the frame at positions at which the purse line is brought into contact with

1. A snap ring for coupling a purse line to a purse seine, comprising: a frame having a first end connected to the purse seine and a second end through which the purse line passes;a plurality of rollers rotatably provided in the frame at positions at which the purse line is brought into contact with the frame;a frame opening formed in one side part of opposite side parts of the frame to open the frame; anda locking unit coupled to the frame to openably close the frame opening,wherein the locking unit comprises:a first cylinder coupled at a first end thereof to a part of the frame by a hinge, the part of the frame corresponding to a first end of the frame opening, the first cylinder being disposed at a second end thereof in the frame at a position corresponding to a second end of the frame opening,so that the frame opening is opened or closed by the locking unit depending on a rotation of the first cylinder around the hinge,wherein one roller selected from the plurality of rollers is provided in at least one side part of the opposite side parts of the frame, andanother roller is disposed to span the opposite side parts of the frame,wherein a mounting notch is formed in the frame to receive the one roller selected from the plurality of rollers therein,wherein the plurality of rollers comprises:a first roller and a second roller respectively provided in the opposite side parts of the frame; anda third roller provided to span the opposite side parts of the frame, the third roller being disposed such that both ends thereof respectively face the first roller and the second roller,wherein in the frame, the first roller is provided in a first mounting notch, and the second roller is provided in a second mounting notch, andthe first, second and third rollers respectively have first, second and third shafts functioning as rotating axes for the corresponding rollers,wherein first ends of the first and second shafts are inserted into corresponding ends of the first and second mounting notches, and second ends of the first and second shafts respectively engage with both ends of the third shaft,wherein an insert depression is formed in the end of the first mounting notch so that the first end of the first shaft is disposed in the insert depression,a hollow space is formed in the insert depression to allow the first end of the first shaft to move in a longitudinal direction thereof, anda cut is formed in the third shaft so that the second end of the first shaft is fitted into the cut, wherein when the first shaft is moved into the hollow space of the insert depression, the second end of the first shaft is removed from the cut of the third shaft,wherein a mounting opening is formed in the insert depression of the first mounting notch to allow the first end of the first shaft to be removed from the insert depression therethrough, the mounting opening being openably closed by a stopper,wherein the stopper is held in the mounting opening by a fastening member which passes through the frame, the first shaft and the mounting opening in order. 2. The snap ring as set forth in claim 1, wherein an end of a shaft which functions as a rotating axis for the roller provided in the one side part of the opposite side parts of the frame engages with a corresponding end of a shaft which functions as a rotating axis for the roller disposed to span the opposite side parts of the frame. 3. The snap ring as set forth in claim 1, wherein a stepped portion is formed in the third shaft at a position corresponding to the second shaft by depressing a corresponding portion of the third shaft such that a thickness thereof differs from a thickness of the other portion of the third shaft,wherein the second shaft stops the stepped portion of the third shaft only in one direction, so that when the second end of the first shaft is removed from the cut of the third shaft, the third shaft is allowed to be removed from the frame in a direction away from the second shaft. 4. The snap ring as set forth in claim 1, further comprising: an auxiliary roller provided in the frame at a position at which the frame is coupled to the purse seine. 5. The snap ring as set forth in claim 4, wherein an auxiliary insert hole is formed in the frame at positions corresponding to both ends of the auxiliary roller, andan auxiliary shaft is inserted into the auxiliary insert hole, the auxiliary shaft functioning as a rotating axis for the auxiliary roller,wherein a stop portion is provided in a first end of the auxiliary insert hole so that one end of the auxiliary shaft is stopped by the stop portion, and a removal prevention cap is fitted into a second end of the auxiliary insert hole to prevent the auxiliary shaft from being removed from the auxiliary insert hole. 6. The snap ring as set forth in claim 1, wherein a positioning protrusion is provided on the second end of the first cylinder, anda locking guide is provided on the frame at the position corresponding to the second end of the frame opening such that the locking guide engages with the positioning protrusion. 7. The snap ring as set forth in claim 1, wherein a positioning protrusion protrudes from the second end of the first cylinder, the positioning protrusion having a first inclined surface reduced in thickness in a direction in which the positioning protrusion protrudes, anda locking guide protrudes from the frame at the position corresponding to the second end of the frame opening, the locking guide having a second inclined surface corresponding to the first inclined surface of the positioning protrusion. 8. The snap ring as set forth in claim 7, wherein the second inclined surface faces an inside of the frame to prevent the first cylinder from moving out of the frame when the first inclined surface of the positioning protrusion is brought into contact with the second inclined surface of the locking guide by the rotation of the first cylinder around the hinge. 9. The snap ring as set forth in claim 6, wherein the locking unit further comprises a second cylinder slidably provided around an outer surface of the first cylinder, wherein when the frame opening is closed by the first cylinder, the second cylinder slides on the first cylinder and covers the locking guide and the positioning protrusion. 10. The snap ring as set forth in claim 9, wherein the first cylinder has a guide slot in a sidewall thereof, the guide slot extending a predetermined length in a longitudinal direction of the first cylinder, anda guide pin is placed through the guide slot, the guide pin passing through the second cylinder,wherein the guide pin moves along the guide slot to move the second cylinder in the longitudinal direction of the first cylinder such that the second cylinder is fitted over or removed from the locking guide. 11. The snap ring as set forth in claim 10, wherein a first locking slot and a second locking slot are respectively formed in first and second ends of the guide slot such that the guide pin moving along the guide slot is locked to the first or second locking slot. 12. The snap ring as set forth in claim 10, wherein a receiving space is formed in the first cylinder, andan elastic unit is placed in the receiving space, the elastic unit comprising: an elastic member inserted into the receiving space; a movable member coupled to a first end of the elastic member, with an insert hole formed in the movable member so that the guide pin is inserted into the insert hole; and a stationary member coupled to a second end of the elastic member, the stationary member closing the receiving space,wherein a first coupling part is provided on the first end of the elastic member, the first coupling part being fastened to a first coupling depression formed in the movable member, and a second coupling part is provided on the second end of the elastic member, the second coupling part being fastened to a second coupling depression formed in the stationary member,whereby when the guide pin is moved along the guide slot, the movable member is biased in a rotating direction because of elasticity of the elastic member, so that the guide pin is easily inserted into and locked to the first locking slot or the second locking slot. 13. The snap ring as set forth in claim 10, wherein a receiving space is formed in the first cylinder, andan elastic unit is placed in the receiving space,wherein the guide pin is placed through the second cylinder, the guide slot and the receiving space in order, the guide pin preventing the elastic unit from being removed from the receiving space, andwhereby when the second cylinder is moved under guidance of the guide slot, the second cylinder is fitted over the locking guide by elasticity of the elastic unit or is removed from the locking guide. 14. The snap ring as set forth in claim 7, wherein the locking unit further comprises a second cylinder slidably provided around an outer surface of the first cylinder, wherein when the frame opening is closed by the first cylinder, the second cylinder slides on the first cylinder and covers the locking guide and the positioning protrusion.