Method for tying string end and device for tying string end in automatic stringing machine

Abstract

To provide a method for tying a string end in an automatic stringing machine.SOLUTION: A method for tying a string end in an automatic stringing machine comprises a step of winding, in a winding start, a string locked to a string locking button around an article to be bound a predetermined number of times using an arm, and forming a knot on an end of the string with a beak and a stripper after locked to the string locking button in a winding end, and a step of squeezing the knot, in this order, the end of the string is tied. In this case, the stripper is plate-shaped and has a step part at the end on the side that comes into contact with the beak, the knot is squeezed while being held down by the step part. This forms a binding article having the knot that is loosely tied and can be easily released.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cord end tying method and cord end tying device for an automatic cording machine that wraps a cord around an object to be bound and binds it. [Background technology]

[0002] The automatic stringing machine automatically wraps a string around the object to be bound, and then binds the object by tying the ends of the string.

[0003] For example, Patent Document 1 proposes a knot-forming beak for a tying machine. The knot-forming beak described in Patent Document 1 has an upper beak and a lower beak, and is structured so that a pinion provided on the beak engages with a gear on a main shaft to rotate at a predetermined timing. In addition, a beak roller connected to the rear end of the lower beak engages with an annular cam at the base of the upper beak, causing the lower beak to swing relative to the upper beak at a predetermined timing, thereby opening and closing the beak. The knot-forming beak described in Patent Document 1 has abutment surfaces on the upper and lower beaks that abut against each other, with a protrusion on one abutment surface and a corresponding recess on the other abutment surface, so that the string that is gripped can be temporarily and securely held when forming a knot.

[0004] Patent Document 2 also describes a method for tying a string end in an automatic binding machine. In the method for tying a string end described in Patent Document 2, a string with a start end of the string fastened to a string fastening button is wound around the outer circumference of an object to be tied a predetermined number of times, and then the end end of the string is again fastened to the string fastening button. Then, as a string end tying process, a loop forming process is completed in which a loop is formed at the start end of the string and the end end of the string, and then a loop tightening process is performed in which both the start end of the string and the end end of the string are pulled into the loop and the loop is tightened to form a knot. In the method for tying a string end described in Patent Document 2, a string end releasing process is performed in which the end end of the string is cut and the start end of the string is pulled out from the string fastening button, and then a loop tightening process is performed. As a result, the string end is released during the loop tightening, so the tension on the string can be significantly reduced, and even a string with low strength can be prevented from breaking, and the string can be prevented from breaking when tying the string end.

[0005] Patent Document 3 also describes a stripper rod for a knot-forming mechanism. The stripper rod described in Patent Document 3 is composed of a tip portion including a tip that contacts the beak, and a support portion connected to the tip portion at one end, and the support portion is configured with a leaf spring so that the tip can move following the beak. This stripper rod is configured to move up and down, and the tip appropriately contacts the outer surface of the beak. As a preliminary step to forming a knot, the beak rotates to wind a string around the outer periphery of the beak in a loop, and then, immediately after the beak grips the string, the stripper rod descends to the outer surface of the beak, and the tip moves relatively while contacting the beak due to the swinging of the beak, causing the loop of the string to escape from the beak. The tip of the stripper rod is provided with a groove to match the center of the knot. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 59-112707 [Patent Document 2] JP 2016-141453 A [Patent Document 3] Patent No. 3747972 Summary of the Invention [Problem to be solved by the invention]

[0007] Conventionally, automatic stringing machines adjust the knot tightly to form a knot with a stable tightness. However, recently, there has been a demand for automatic bundling of small items such as electrical cords, wires, electric cables, and paper bags. When bundling electrical cords, wires, and paper bags, if the knot is tight, a cutting tool such as a cutter must be used to release the bundling, which increases the risk of damaging the electrical cords, wires, electric cables, paper bags, and other items being bound.

[0008] Therefore, there is a demand for tying the objects to be tied in a knot that is gentle and has a stable tightness so that it will not come undone while the objects are being moved and can be easily released without the use of a cutting tool when the knot is released.

[0009] In response to the above demand, the present invention aims to provide a method and device for tying cord ends in an automatic stringing machine that can produce knots of gentle and stable tightness when automatically tying materials (objects to be tied) such as electric cords, wires, paper bags, etc. Here, a "knot of gentle and stable tightness" refers to a knot that does not come undone while the object to be tied is in motion, but is tight enough to be easily released without using a cutting tool. [Means for solving the problem]

[0010] In order to achieve the above object, the inventors of the present invention have focused on the stripper of an automatic stringing machine. As a result, they have come up with the idea of ​​forming an end shape of the stripper with a step portion 7a as shown in FIG. 1. They have found that by forming a knot at the end of a string using a stripper with such an end shape and holding and squeezing the knot with the step portion, it becomes a knot suitable for the knot at the end of a string for automatic bundling of materials (objects to be bound) such as electric cords, wires, and paper bags. It should be noted that when a knot is formed at the end of a string using a conventional stripper 71 (having a U-shaped groove at the end) as shown in FIG. 9 and the knot is squeezed, the knot is sufficiently squeezed and tightly knotted.

[0011] The present invention was completed based on these findings and further investigations. [1] A method for tying a string end in an automatic stringing machine, comprising: The method includes, in this order, a wrapping step of wrapping a string around an object to be bound using an arm, a step of forming a knot at the end of the string using a beak and a stripper, and a step of tightening the knot, 1. A method for tying string ends in an automatic stringing machine, wherein the stripper is plate-shaped and the end that comes into contact with the beak is shaped to have a stepped portion. [2] A method for tying string ends in an automatic stringing machine as described in [1], characterized in that the step of forming a knot in the string end includes a step of orienting the plate surface of the stripper perpendicular to the direction of movement of the beak, and advancing the stripper so that one end of the stripper can abut against the side of the beak. [3] The method for tying cord ends in an automatic stringing machine described in [1], characterized in that the step of the stripper is used to tighten the knot while holding the knot. [4] A method for tying cord ends in an automatic stringing machine as described in any one of [1] to [3], characterized in that a cord end releasing step is provided in the middle of the knot tightening process, in which the cord end is released by a cord end releasing means having a knife and a cord hook groove. [5] A method for tying string ends in an automatic stringing machine as described in [1], characterized in that the step portion is formed at the end portion on the side that abuts against the beak, at a position that abuts against the knot. [6] A string end tying device for an automatic stringing machine having a wrapping means for wrapping a string around an outer circumference of an object to be tied and a string end tying means, the wrapping means having an arm, A cord end tying device for an automatic stringing machine, characterized in that the cord end tying means has a beak capable of clamping the cord, and a stripper that can move back and forth in a direction perpendicular to the direction of movement of the beak and is arranged so that it can abut against the side of the beak, and has a means for forming a knot at the end of the cord and a means for tightening the knot, wherein the stripper is plate-shaped and has a stepped portion at the end that abuts against the beak. [7] A string end tying device in an automatic stringing machine described in [6], characterized in that the plate surface of the stripper is oriented perpendicular to the moving direction of the beak and one end of the stripper is arranged so that it can abut against the side of the beak. [8] The cord end tying device in the automatic stringing machine described in [6] or [7] is further characterized in that it further comprises a cord end release means having a knife and a cord hook groove, the cord end release means being disposed so as to release the cord end after the knot is formed and in the middle of tightening the knot. Effect of the Invention

[0012] The present invention has the remarkable effect of making it possible to knot the ends of strings in an automatic stringing machine with a desired gentleness and firmness that will not come undone while the object to be bound is in motion and that can be easily released without using a cutter or other cutting tool. The present invention also has the effect of improving the efficiency of automatic binding of materials (objects to be bound) such as electric cords, wires, paper bags, etc. [Brief description of the drawings]

[0013] [Figure 1]1A, 1B, and 1C are explanatory diagrams showing an example of a stripper used in the present invention, in which (a) is a side view, (b) is a plan view, and (c) is a front view. [Diagram 2] 10 is an explanatory diagram showing a schematic outline of the state in which the string is locked between the object to be tied and the string locking button during the wrapping process; FIG. [Diagram 3] FIG. 1 is a schematic diagram illustrating the state in which the two strings at the beginning and end of the knot are pushed in by the insertion arms during the process of forming a knot (a), the state in which the two strings are wrapped around the outer circumference of the beak (b), and the state in which the ends of the strings are held in the beak (c). [Figure 4] FIG. 2 is an explanatory diagram showing an example of a state in which the knot is tightened by pulling two strings while holding the knot with a stripper in the step of tightening the knot in the present invention. [Diagram 5] FIG. 11 is an explanatory diagram showing a schematic example of a state in which a knot is tightened. [Figure 6] This is an explanatory diagram showing a contact state between the knot 3R and the stripper when the tip of the beak 6 is released from the contact with the stripper. The observation direction is the retraction direction of the beak 6. (a) In the case of the stripper 7 used in the present invention, (b) in the case of using the conventional stripper 71. [Figure 7] FIG. 4 is an explanatory diagram showing a schematic example of a cord end release means. [Figure 8] FIG. 1 is an explanatory diagram showing an example of the shape of a knot obtained in an example. [Figure 9] 1A is a side view of an example of a conventional stripper, FIG. [Figure 10] FIG. 2 is an explanatory diagram (perspective view) showing a schematic diagram of engagement between a beak 6 and a stripper 7 and their peripheral components in the strapping machine of the present invention. [Figure 11] FIG. 2 is an explanatory diagram (perspective view) showing a schematic diagram of engagement between the beak 6 and its peripheral parts in the strapping machine of the present invention. [Figure 12] FIG. 13 is an explanatory diagram (perspective view) that shows a schematic diagram of the state of squeezing a knot 3R when a stripper 7 of the present invention is used. [Figure 13] FIG. 13 is an explanatory diagram (perspective view) that shows a schematic diagram of a knot 3R being squeezed when a conventional stripper 71 is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention is a method for tying the ends of strings in an automatic stringing machine, which can stably form loose knots. The string used can be any string commonly used for wrapping, and does not need to be limited to a particular one, but a flat PE string is preferable.

[0015] The automatic stringing machine used in the present invention comprises an arm 2 that wraps a string 3 around the outer circumference of the item W to be tied, a string locking button 4 that locks the string, an insertion arm 5 having a U-shaped tip, a beak 6 configured to clamp the string, a plate-shaped stripper 7, and a string end release means 8.

[0016] [stripper] The stripper 7 used in the present invention is plate-shaped with a step 7a at the end that comes into contact with the beak 6, as shown in Fig. 1. The stripper 7 is disposed so that its plate surface moves forward toward the side of the beak 6 in a direction perpendicular to the direction of movement of the beak 6. The step 7a formed at the end that comes into contact with the beak 6 is at the same height as the abutment surface where the upper beak 61 and the lower beak 62 abut against each other, and is formed at a position where it can abut against the knot 3R. The height d of the step does not need to be particularly limited.

[0017] [Wrapping process] The method for tying a string end of the present invention first includes a step of winding a string 3 around an object to be tied W using an arm 2 (winding step), as shown in Fig. 2. The arm 2 is preferably configured to be substantially L-shaped so that it can rotate together with a rotating shaft (not shown) to wind the string 3 around the outer periphery of the object to be tied W, and to accurately wind the string around the object to be tied W. Tension is applied to the string 3 that is wound around the object to be tied W by an adjustment means (not shown).

[0018] In the present invention, first, as shown in Figure 2(a), the starting end 31 of the string 3 to be wrapped around the outer periphery of the object to be bound W is engaged with the string engaging button 4. Then, as shown in Figure 2(b), the string 3 is wrapped around the outer periphery of the object to be bound W a predetermined number of times using the arm 2, and as shown in Figure 2(c), the ending end 32 is engaged with the engaging button 4.

[0019] [The process of forming a knot at the end of the string] Next, as shown in FIG. 3(a), the string is inserted into the insertion arm 5 having a U-shaped tip. The two strings, the end winding side 32a of the string and the start winding side 31a of the string, are pushed in together to a position (hereinafter also referred to as the front position) that is in front of the stop position of the beak 6. Here, the end winding side 32a of the string refers to the string between the end winding end 32 that is fastened to the string fastening button 4 and the object W to be tied, and the start winding side 31a of the string refers to the string between the start winding end 31 that is fastened to the string fastening button 4 and the object W to be tied.

[0020] The insertion arm 5 is disposed so that its tip is pressed against the string winding end side 32a and the string winding start side 31a and can advance to the front position of the beak 6, and so that the beak 6 can enter the U-shaped part at the tip. After the beak 6 has entered, the insertion arm 5 retreats to its original position. As shown in FIG. 10, the insertion arm 5 engages with an insertion lever 103 that engages with a main cam 102, allowing it to advance or retreat. The main cam 102 is inserted through a main shaft 101, and the main shaft 101 is disposed so that it can rotate by transmitting the rotation of a motor (not shown) through a V-belt and gears.

[0021] As shown in Fig. 3, the beak 6 has an upper beak 61 and a lower beak 62, and is configured to be able to clamp the string 3. As shown in Fig. 10, the beak 6 has a beak body 63 and a roller 64. By engaging the roller 64 attached to the beak body 63 with the main cam 102, the beak 6 can be moved forward and backward to a position where the string can be wound between the object W and the string locking button 4.

[0022] Also, beak 6 is provided with pinion 65 and bevel gears 66, 67 as shown in Fig. 11. And, pinion 65 is provided so as to mesh with sector gear 1021 of main shaft 101 as shown in Fig. 10. Furthermore, bevel gear 66 is provided on the end of the shaft (pinion shaft) to which pinion 65 is fixed, and bevel gear 67 is provided so as to engage with bevel gear 66 as shown in Fig. 11, enabling beak 6 (upper beak 61, lower beak 62) to rotate (horizontally) via a shaft interlocked with bevel gear 67.

[0023] In addition, as the beak 6 rotates, as shown in Figure 11, a beak roller 621 connected to the rear end of the lower beak 62 engages with an annular cam 631 at the base of the upper beak 61, enabling the lower beak 62 to swing relative to the upper beak 61, and the upper and lower beaks to open and close.

[0024] After the insertion arm 5 has pushed both strings into a position in front of the stop position of the beak 6, the beak 6 is advanced and inserted into the U-shaped tip of the insertion arm 5 as shown in Fig. 3(a). The insertion arm 5 is then retreated and the beak 6 is rotated (horizontally) as shown in Fig. 3(b) to wind the two strings around the outer circumference of the beak 6. Furthermore, as shown in Fig. 3(c), as the beak 6 rotates (horizontally), the beak 6 opens and holds the locking button sides of the two strings between the upper beak 61 and the lower beak 62, and then the beak 6 is closed to form loops of the two strings around the beak 6.

[0025] The stripper 7 used in the present invention is in the form of a plate as shown in FIG. 1, with one end (the side that abuts against the side surface of the beak 6) having a stepped portion 7a.

[0026] 4(a), the plate surface of the stripper 7 is advanced toward the side surface of the beak 6 in a direction perpendicular to the advancing and retreating direction of the beak 6, and one end of the stripper 7 is brought into contact with the side surface of the beak 6. Note that, as shown in FIG. 10, one end of a stripper lever 104 engages with an elongated hole provided in the stripper 7, and the other end engages with the main cam 102, causing the stripper 7 to advance or retreat.

[0027] Then, one end of the stripper 7 is brought into contact with the side of the beak 6 to restrict the movement of the two loops of string that have been formed, and the beak 6 is moved backward (upward in the plane of the paper) to pull the beak 6 out of the two loops of string that have been formed. The two strings held by the beak 6 are then pulled into the two loops of string, forming a knot 3R at the end of the string. This state is shown in Figure 4(b). This completes the process of forming a knot at the end of the string.

[0028] [Process of tightening the knot] The method for tying a string end of the present invention includes a step of tightening the knot after forming the knot 3R. In the process of tightening the knot, the beak 6 is moved backward while holding the knot 3R with the stepped portion 7a of the stripper 7, and the two strings held by the beak 6 are pulled to tighten the knot. Figure 5 is an explanatory diagram showing a schematic diagram of the knot 3R being tightened as viewed from the backward direction of the beak 6.

[0029] After the knot 3R is formed, as the beak 6 further retreats, the stripper 7 comes off the beak 6. However, as shown in FIG. 6(a), the step 7a only holds down the upper right portion of the knot 3R. With this level of pressure, as the beak 6 further retreats, the knot 3R is pulled by the beak 6 and easily comes off the step 7a. When the stripper 7 having the step 7a described above is used, there is less restraint on the knot 3R, and the knot 3R easily comes off the stripper 7. This situation is shown in FIG. 12. As a result, a knot with a loose firmness is stably formed.

[0030] In contrast, when a conventional stripper 71 having a U-shaped groove 71a as shown in Fig. 9 is used, when the stripper 71 is released from the beak 6, approximately the right half of the knot 3R is held in the U-shaped groove 71a as shown in Fig. 6(b). In this state, even if the knot 3R is pulled by the further retreat of the beak 6, the knot 3R does not come out of the U-shaped groove 71a and remains held in the U-shaped groove 71a. This situation is shown in Fig. 13. Therefore, the knot 3R is sufficiently squeezed, and the knot that is formed is a tight knot.

[0031] After the squeezing is complete, the stripper releases the two strings held in its beak and retreats, finishing tying the ends of the strings.

[0032] [String end release step] In the present invention, a cord end releasing step is provided in the middle of the process of tightening the knot, in which the cord end is released by activating the cord end releasing means 8. An example of the cord end releasing means 8 is shown in FIG. In the cord end releasing step, the end 32a of the cord is cut by the knife 81 of the cord end releasing means 8, and the start 31a of the cord is pulled out of the locking button 4 by the cord hook groove 82 of the cord end releasing means 8, thereby releasing the cord end (see Figures 4(a) and (b)).

[0033] [Method of tying the string ends] The present invention also relates to a cord end tying device 1 for an automatic stringing machine having a wrapping means and a cord end tying means. In the present invention, the wrapping means having an arm 2 wraps a cord 3 around the outer circumference of an object to be tied a predetermined number of times, and then the cord end tying means ties the cord end to tie the object to be tied.

[0034] In the wrapping means of the present invention, as shown in FIG. 2, a string 3 having a starting winding end 31a attached to a string-fastening button 4 is wrapped around the object to be bound W a predetermined number of times using an arm 2, and the ending winding end of the string is fastened to the string-fastening button 4.

[0035] The string end tying means of the present invention has a means for forming a knot at the string end and a means for tightening the knot, and as shown in Figures 3 and 4, comprises an insertion arm 5 with a U-shaped tip, a beak 6 configured to be able to clamp the string 3, a plate-shaped stripper 7 arranged to be able to move forward and backward in a direction perpendicular to the forward and backward direction of the beak 6 and to be able to abut against the side of the beak 6, and a string end releasing means 8. As shown in Figure 7, the string end releasing means 8 has a knife 81 that cuts the winding end side 32a of the string 3, and a string hooking groove 82 that pulls out the winding start end 31a from the locking button 4.

[0036] [Method of forming a knot] The knot-making means, as shown in Fig. 3, is configured to include an insertion arm 5 and a beak 6, and to form two loops of string around the outer circumference of the beak 6. The tip of the insertion arm 5 is U-shaped, and is disposed so as to be able to advance and retreat up to a position in front of the beak 6.

[0037] As shown in Fig. 3(a), the insertion arm 5 pushes two strings, the start winding side 31a of the string between the start winding end and the object to be bound, and the end winding side 32a of the string between the end winding end and the object to be bound, into the front position of the beak 6. Then, the beak 6 is advanced (swinged) and inserted into the U-shaped tip of the insertion arm 5. Next, after the insertion arm 5 is retreated, the beak 6 is rotated around its axis (horizontally) as shown in Fig. 3(b), and the two strings pushed into the position of the beak 6 are wound around the outer circumference of the beak 6, forming the two strings into a loop shape. 3(c), the upper and lower beaks 61, 62 open up and bite the two adjacent strings at their string fastening button sides, and then close the upper and lower beaks 61, 62 to hold the two strings in their mouths. In this way, loops of the two strings are formed around the outer circumference of the beak 6.

[0038] 4, the beak 6 and stripper 7 are provided, and the stripper 7 forms a knot 3R at the end of the string while regulating the movement of the two loops of string formed on the outer periphery of the beak 6. The stripper 7 is capable of moving forward and backward in a direction perpendicular to the forward and backward direction of the beak 6, and is provided so as to be able to come into contact with the side of the beak 6.

[0039] As shown in Figures 4(a) and (b), the stripper 7 is disposed so that its plate surface faces a direction perpendicular to the direction of advancement and retreat of the beak 6, so that it can advance and retreat toward the side surface of the beak 6, and so that one end of the stripper 7 can abut against the side surface of the beak 6. That is, the stripper 7 is advanced toward the side surface of the beak 6 until it abuts against the side surface of the beak 6. Then, while the stripper 7 restricts the movement of the two string loops formed around the outer periphery of the beak 6, the beak 6 is retreated, and the beak 6 is pulled out from the two string loops. By pulling out the beak 6, the two strings held by the beak 6 are pulled into the two string loops, and a knot 3R is formed at the end of the string.

[0040] [Method of tightening the knot] Furthermore, the means for tightening the knot comprises a stripper 7 and a beak 6, and is configured to tighten the knot. As shown in Fig. 4(b), a step 7a formed on one end of the stripper 7 (the end that abuts against the beak 6) holds down the knot 3R, while the beak 6, which holds the string fastening button sides of the two strings, is moved back to pull the two strings and tighten the knot 3R. A stripper with a step at its end provides less constraint on the knot, and the knot 3R is more likely to come off the stripper 7 during tightening, shortening the time required to tighten the knot and forming a looser knot.

[0041] In addition, in the case of a conventional stripper 71 having a U-shaped groove at the end as shown in FIG. 9, the knot is strongly restricted, making it difficult for the knot to be removed from the stripper and resulting in a tight knot.

[0042] In the present invention, it is preferable to provide a cord end release means 8 as shown in FIG. 7, and to operate the cord end release means 8 after forming the knot and before tying the knot, or during tying the knot, as shown in FIGS. 4(a) and 4(b), so that the cord winding end 32a is cut with the knife 81 of the cord end release means 8 and the cord winding start side 31a is pulled out of the locking button 4 with the cord hook groove 82 of the cord end release means 8, thereby releasing the cord end.

[0043] The present invention will now be further described with reference to examples. EXAMPLES

[0044] Straight wires (electric wires) were bundled as the object to be bound, and then wrapped twice with a string (made of PE) using an automatic stringing machine to obtain a bound object (outer diameter: 100 mm). The automatic stringing machine used was an automatic stringing machine equipped with an arm 2, a string locking button 4, an insertion arm 5 with a U-shaped tip, a beak 6, a stripper 7, and a string end release means 8 having a knife for cutting the end of the string at the end where the string ends, and a string hooking groove for pulling out the end at the start of the string from the string locking button.

[0045] The case where the stripper 7 having the end shape shown in FIG. 1 was used was taken as an example of the present invention, and the case where the stripper 7 having the end shape shown in FIG. 9 was used was taken as a comparative example.

[0046] The string 3, whose winding start end is fastened to the string fastening button 4, is wound around the object W to be bound twice using the arm 2, and the winding end of the string is fastened to the string fastening button 4. Next, the two strings, the winding start side of the string between the winding start end and the object to be bound, and the winding end side of the string between the winding end and the object to be bound, are pushed to the front position of the beak 6 by the insertion arm 5. Then, the beak 6 is advanced (swinged) and inserted into the U-shaped tip of the insertion arm 5, the insertion arm 5 is retreated, and then the beak 6 is rotated (horizontally) to wind the two strings around the outer circumference of the beak 6, and further the beak 6 holds the string fastening button 4 sides of the two strings in its mouth, forming loops of the two strings around the beak.

[0047] Next, as shown in Figure 1, a plate-shaped stripper 7 having a stepped end on the side that abuts against the side of the beak 6 was advanced toward the side of the beak 6 with its plate surface facing perpendicular to the direction of advancement and retreat of the beak 6, abutting against the side of the beak 6 and restricting the movement of the two string loops that had been formed. Next, the beak 6 was retreated and the beak 6 was pulled out of the two string loops that had been formed. As a result, the two strings held by the beak 6 were pulled into the two string loops, and knots 3R were formed at the ends of the strings (the step of forming knots).

[0048] After the knot 3R was formed, the cord end releasing means 8 was operated to release the cord end as a cord end releasing step. To release the cord end, as shown in Fig. 7, the winding end side portion 32a of the cord was cut with the knife 81 of the cord end releasing means 8, and the winding start side end portion 31a of the cord was pulled out from the cord locking button 4 by the cord hook groove 82 of the cord end releasing means 8. Thus, the cord end was released.

[0049] Next, as a process for tightening the knot, the beak 6 is moved back while holding down the knot 3R with the stepped portion 7a of the stripper 7, and the two strings held by the beak 6 are pulled to tighten the knot 3R, completing the knot at the ends of the strings and obtaining a bundle (an example of the present invention).

[0050] The knot obtained did not come undone during transportation. The knot obtained was loose enough that it could be released with bare hands and did not require the use of a cutter or other cutting tool. The length between the knot and the ends of the two strings held by the beak (L mm shown in Figure 8(a)) was 14 mm.

[0051] On the other hand, as a comparative example, for the same object to be tied as described above, a knot was formed at the end of the string in contact with the beak 6 using a plate-shaped stripper 71 having a U-shaped groove as shown in FIG. 9 in the same manner as described above, and the resulting knot was squeezed to complete the knot at the end of the string.

[0052] The resulting bundle did not come undone during transportation, but it was a tight knot, and a cutter had to be used to release it. The length between the knot and the ends of the two strings held by the beak (Lmm shown in Figure 8(b)) was 22 mm. The squeezing time was long, which shows that the knot was sufficiently squeezed. [Explanation of symbols]

[0053] 1. String end tying device 2 Arm 3. String 4 Strap fastening button 5 Insertion arm 6. Beak 61 Upper Beak 62 Lower Beak 621 Beak Roller 63 Beak body 631 Cam 64 Coro 65 Pinion 66, 67 Bevel gear 7. Stripper 7a Step part 71 Conventional Stripper 71a U-shaped groove 8 String end release means 81 Knife 82 Cord hook groove 101 Main shaft 102 Main Cam 103 Insertion Lever 104 Stripper lever 105 Stripper spring 1021 Sector Gear

Claims

1. A method for tying a string end in an automatic stringing machine, comprising the steps of: The method includes, in this order, a wrapping step of wrapping a string around an object to be bound using an arm, a step of forming a knot at the end of the string using a beak and a stripper, and a step of tightening the knot, 1. A method for tying string ends in an automatic stringing machine, wherein the stripper is plate-shaped and the end that comes into contact with the beak is shaped to have a stepped portion.

2. 2. A method for tying string ends in an automatic stringing machine as described in claim 1, characterized in that the step of forming a knot in the string end includes a step of orienting the plate surface of the stripper perpendicular to the direction of movement of the beak and advancing the stripper so that one end of the stripper can abut against the side of the beak.

3. 2. The method for tying string ends in an automatic stringing machine according to claim 1, wherein the step of tightening the knot comprises tightening the knot while holding the knot with the stepped portion of the stripper.

4. 4. The method for tying a cord end in an automatic stringing machine according to claim 1, further comprising a cord end releasing step, during the step of tightening the knot, of releasing the cord end by a cord end releasing means having a knife and a cord hooking groove.

5. 2. A method for tying a string end in an automatic stringing machine according to claim 1, wherein the step is formed at an end on a side that abuts against the beak, at a position that abuts against the knot.

6. A string end tying device for an automatic stringing machine having a wrapping means for wrapping a string around an outer periphery of an object to be tied and a string end tying means, the wrapping means having an arm, A cord end tying device for an automatic stringing machine, characterized in that the cord end tying means has a beak capable of clamping the cord, and a stripper that can move back and forth in a direction perpendicular to the direction of movement of the beak and is arranged so that it can abut against the side of the beak, and has a means for forming a knot at the end of the cord and a means for tightening the knot, wherein the stripper is plate-shaped and has a stepped portion at the end that abuts against the beak.

7. 7. The string end tying device for an automatic stringing machine according to claim 6, wherein the plate surface of the stripper is oriented perpendicular to the direction of movement of the beak, and one end of the stripper is arranged so as to be able to abut against the side of the beak.

8. 8. The cord end tying device for an automatic stringing machine according to claim 6 or 7, further comprising a cord end release means having a knife and a cord hook groove, the cord end release means being disposed so as to release the cord end after the knot is formed and in the middle of tightening the knot.

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