JP2016113156A - Automatic binding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic binding machine capable of binding, using a string having low intensity (for example, a tension strength of 20 N or lower).SOLUTION: An automatic binding machine 1 is configured to wind a string 5 around an article W to be bound, by rotating a rotation arm 20 in a state of engaging the string 5 which is passed to a tip end 25 of the rotation arm 20 which is an almost L-shape attached to a hollow shaft 30, to a string engagement button 7. A tension arm 40 for adjusting tension of the string 5 by drawing the string 5 between a take-out hole 37 in the hollow shaft 30 and the tip end 25 of the rotation arm 20 to a direction separated from the rotation arm 20, is formed of a plate spring. The tension arm 40 itself is composed of the plate spring, so that weak tension application to the string is achieved, and the structure of the tension arm 40 is simplified, and therefore the automatic binding machine 1 is made hardly broken and excellent in maintenance property.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an automatic binding machine, and more particularly, in an automatic binding machine that automatically performs a process from winding a string around a bundle to be bound, tying and cutting, and adjusting the tension applied to the string during the binding operation. The present invention relates to an automatic binding machine characterized by the structure of a tension arm.

  In the present invention, the term “binding” includes not only tying a plurality of objects to be bound together with a string but also tying a single object to be bound with a string.

  An automatic binding machine that automatically performs a series of processes from winding a string around the object to be bound and tying and cutting the string, for example, a bundling machine such as a flower (vegetable), bundles these objects to be bound. Widely used for bundling work.

  A typical automatic binding machine mainly includes a stack of about 20 cardboard sheets that are currently folded, printed materials before bookbinding, linen products such as yukata and towels, and the like.

  The automatic binding machine 100 includes an L-shaped rotating arm 120 that circulates around the object to be bound W, and locks the leading end of the string passed through a guide 129 provided at the leading end portion 125 of the rotating arm 120. The cord 105 can be wound around the object to be bound W by rotating the rotary arm 120 while being locked to the button 107.

  A configuration example of the automatic binding machine 100 including such an L-shaped rotating arm 120 will be described with reference to FIG. 8 (FIG. 1 of Patent Document 1).

  An automatic binding machine 100 shown in FIG. 8 includes two tables 111 and 112 arranged with a predetermined gap G, a string locking button 107 for locking the leading end of the string below the tables 111 and 112, A rotary arm 120 having a string 105 with its tip locked to the string locking button 107 is provided, and the rotary arm 120 is rotated by a motor (not shown) to be placed between the two tables 111 and 112. The outer periphery of the object to be bound W can be wound by the string 105 that has passed through the gap G between the tables 111 and 112 by rotating the outer periphery of the object to be bound W around the distal end portion 125 of the rotary arm 120. It is configured as follows.

  As for the attachment of the string to the above-described rotating arm 120, the rotating shaft of the rotating arm 120 is formed by the hollow shaft 130, and the string 105 inserted from one end of the hollow shaft 130 is formed on the side surface near the other end of the hollow shaft 130. The string taken out from the take-out hole 137 is passed through guides 126 to 129 provided on the rotary arm 120 through the leading end portion 125 of the rotary arm 120, and then the string lock button 107 is engaged. It is done by stopping.

  Then, the automatic binding machine 100 shown in FIG. 8 is wound in a roll shape so that the tension of the string 105 can be maintained within a predetermined range at the time of winding, tying, and cutting the string with respect to the object to be bound W. The string pulled out from the state is clamped by a leaf spring provided in the brake means 160 to give resistance to the movement of the string 105 in the longitudinal direction, and the string passed through the guides 126 to 129 provided in the rotating arm 120 is The tension arm 140 pulls the guide 127 and the guide 128 away from the rotary arm 120.

  In the automatic binding machine 100 shown in FIG. 8, the tension arm 140 is pivotally supported by a support shaft 148 on the base side so as to be swingable near the base of the rotary arm, and is attached to the tension arm 140. The tip of the tension arm 140 is constantly urged in a direction away from the rotary arm 120 by the urging force of the coil spring 147 fitted on the curved rod 146, so that the string 105 is braked against the string 105. A predetermined tension is maintained by the resistance given by the means 160 and the urging force given to the tension arm 140 by the coil spring 147.

  In general, the automatic binding machine is generally used for the work of bundling the above-described objects to be bound together so as not to be separated.

  And as a string used for binding, a relatively high strength string such as a PE string is used, and the string is tightly wound around the outer periphery of the object to be bound with a relatively high tension applied to the string. , The bundling material is prevented from separating after bundling.

  On the other hand, in the field of food processing, for example, in roll-type boiled dishes such as roll cabbage and kelp rolls, the cabbage and kelp wound on the outside are unwound during cooking and the ingredients inside pop out. In order to prevent this, after cabbage or kelp is wound, an edible string such as Kanpyo is wound around the outer periphery and tied.

  The bundling work of food using edible strings is currently performed manually by humans. However, when labor costs have soared, there is a demand for mechanization of the wrapping work of edible strings. For the purpose of use for processed foods, as an edible string that has high mechanical strength and does not stretch even when simmered, a string made of a dried product of konjac as a main component has also been proposed (see Patent Document 2).

Japanese Patent No. 3445613 JP 2001-186856 A

  As described above, the automatic binding machine is generally intended to use a relatively high-strength string such as a PE string to bind the objects to be bound under a relatively high tension. For this reason, even if such an automatic binding machine is used to perform binding using a low-strength string, the string is broken during the operation, and the binding cannot be performed.

  As introduced in Patent Document 2, as an edible string used for the scroll-based boiled dishes mentioned above, research to increase the mechanical strength for the purpose of mechanization of binding has been promoted. Has been obtained.

  However, the edible string must be edible (can be bitten), so there is a limit to increasing the strength even though it is high strength. In fact, the applicant of Patent Document 2 Tensile strength measured by obtaining commercially available edible string (“Glucon string” manufactured by Nakaki Foods Co., Ltd.) is 13-25, average 20N (about 2kgf), and generally tensile strength of 150N (about 15kgf) or more. Compared with a PE string or the like having a strength, the strength thereof is significantly low, so that it still does not have a strength that can withstand binding with an existing automatic binding machine.

  Even if an edible string with higher mechanical strength is developed, if the object to be bound is wound with a relatively high tension that is applied to the string by an existing automatic binding machine, the food is not vulnerable. In bundling for a bundling object, there is a risk that the bundling may damage the bundling object, such as the string biting into the bundling object when it is wound and deforming the bundling object or cutting the bundling object. From this point of view, there is a restriction on the use of the automatic binding machine for weakly bound objects such as processed foods.

  Here, in order to prevent the cord from being broken even if a low-strength string is used, or even to bind a fragile workpiece, the tension applied to the string is slightly weak. Assuming that the edible string mentioned above is used, the tension applied to the string is 20N (about 2kgf) or less, more certainly 10N (about 1kgf) or less. It is necessary to suppress.

  In order to make the tension applied to the string as weak as this, it is considered to remove the brake means 160 described above from the configuration of the automatic binding machine 100 and release the resistance applied to the string. If comprised in this way, a string can be pulled out almost without receiving resistance, so long as it receives contact resistance with a string passage formed in the hollow shaft 130, an extraction hole 137, guides 126 to 129, and the like. It becomes.

  However, if the brake means 160 is eliminated and the resistance of the string is greatly reduced, the urging force of the coil spring 147 that urges the tension arm 140 greatly overcomes the resistance of the string. The tip end portion is always present at a position farthest from the rotary arm 120, and the function of absorbing the slack generated in the string 105 is not exhibited.

  If the tension arm 140 is intended to absorb the slack of the string, the urging force applied to the tension arm 140 is extremely weak enough to balance the slight resistance that the string receives due to the contact resistance with the passage or the like. However, it is extremely difficult to obtain such a weak urging force by urging by the coil spring 147 as in an existing automatic binding machine.

  Even if the tension arm can be urged by such a weak force by the coil spring 147, the coil spring 147 is easily broken by downsizing, and not only does the failure occur frequently, but also the automatic binding machine is processed food. In consideration of use in the manufacture of the above, there is a problem in terms of hygiene or safety, such as a fragment of the broken coil spring 147 may be mixed as a foreign substance in the food.

  Furthermore, even if the above-described problem can be solved by the configuration of the conventional automatic binding machine 100, the conventional automatic binding machine 100 can use the tension arm 140 in addition to the tension arm 140 as shown in FIG. And a support member 149 that regulates the position of the end of the coil spring 147, a curved rod 146 that externally fits the coil spring 147, and the like. The structure increases the number of parts, which not only increases manufacturing costs, but also reduces workability during maintenance. In particular, when an automatic binding machine is used as a food production machine that requires frequent disassembly and cleaning for hygiene management, such a decrease in maintainability also reduces productivity.

  As described above, even if the resistance applied to the cord 105 is greatly reduced by removing the brake means 160 from the apparatus configuration, the tension applied to the cord 105 is suddenly increased when the rotating arm 120 starts to rotate. Therefore, it is still easy to break the string at the initial stage of winding the string.

  Therefore, the tension arm 140 needs to be biased with a weak force so that it can swing flexibly and can swing even under a relatively weak force so that it can start swinging flexibly and absorb a sudden increase in tension in the initial stage of rotation. .

  On the other hand, if the biasing force of the tension arm 140 is weak, the tension arm 140 will not return to the state where the tip of the rotary arm 120 is brought into contact with the rotary arm 120 during the rotation of the rotary arm 120. If the tension of the string further rises due to the above, etc., it cannot be absorbed and the string is broken.

  Therefore, it is preferable that the tension arm 140 is configured so that the urging force is increased as the tip approaches the rotating arm 120 so that the tip is separated from the rotating arm 120.

  In this regard, in the automatic binding machine described in the above-mentioned Patent Document 1, a first coil spring that applies an urging force in the entire swing range of the tension arm and a predetermined swing in which the tip of the tension arm is close to the rotary arm. When a second coil spring is provided that applies an urging force only in the moving range, and when the tension arm reaches a predetermined swinging range with its tip close to the rotating arm, in addition to the urging by the first coil spring, It has also been proposed to prevent the tension arm from stopping its movement by abutting the tip of the tension arm against the rotating arm by adding a bias by the second coil spring (see Patent Document 1). (See FIGS. 3 and 6).

  However, in such a configuration, the tension arm mechanism further increases the number of parts, which makes the structure even more complex and increases the manufacturing cost of the automatic binding machine. Is further reduced.

  In the above description, as an example of bundling, bundling of processed foods using edible strings has been described. However, as described above, the tension applied to the string is weak, and the string is prevented from slackening. If it is possible to bind a string to a bundle, it is possible to bind a string using a low-strength string other than an edible string without breaking the string, and to bind a fragile object to be bound. Even in the case of binding, it is possible to bind without damaging the object to be bound, and the above-mentioned problem can be achieved by using a string of material or a fragile object that could not be achieved by a conventional automatic binding machine. It can expand the range of application of automatic binding to automatic binding by using an automatic binding machine, and can contribute to the development of new sales channels for automatic binding machines.

  Therefore, the present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and by reexamining the structure of the tension arm provided in the existing automatic binding machine, the tension applied to the string is weak. An automatic binding machine equipped with a tension arm that can prevent the slack of the string while allowing binding to be in a state of 20 N (about 2 kgf) or less, preferably 10 N (about 1 kgf) or less as an example. By doing so, it is possible to suitably perform binding using extremely low-strength strings, such as edible strings, which are impossible with conventional automatic binding machines, and binding of fragile objects to be bound. The simple structure with a small number of points and the use of a coil spring that may break may greatly improve maintenance such as disassembly and cleaning, and failure is unlikely to occur. Also it aims to pieces of the coil spring to provide an automatic binding machine having a tension arm no fear of mixing as foreign matter material to be bound.

  In addition to the above-described object, the present invention realizes a configuration in which the urging force applied to the tension arm increases as the tip of the tension arm approaches the rotary arm with an extremely simple structure without providing additional parts. Thus, as described above, it is intended to prevent the occurrence of a locked state in which a weak tension is applied to the string but the tip end portion of the tension arm abuts against the rotating arm and stops moving.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, this code is limited to the interpretation of the technical scope of the present invention. Not used.

In order to achieve the above object, the automatic binding machine 1 of the present invention includes:
A hollow shaft 30 having one end as a string insertion port and a take-out hole 37 for taking out the string on the side surface near the other end;
A substantially L-shaped rotary arm 20 having a distal end portion 25 through which a string taken out from the extraction hole 37 is passed, and rotating with the hollow shaft 30 so that the distal end portion 25 moves on a predetermined rotation path S; ,
A string locking button 7 for locking the leading end of the string passed through the distal end portion 25 of the rotating arm 20;
A tension arm 40 that pulls out a string extending from the take-out hole 37 to the distal end portion 25 of the rotary arm 20 in a direction away from the rotary arm 20 and applies a predetermined tension to the string;
In the automatic binding machine, the string can be wound around the object to be bound W arranged inside the rotation track S of the tip portion 25 of the rotary arm 20 by the rotation of the rotary arm 20;
The tension arm 40 is formed by a leaf spring whose base side is fixed to the hollow shaft 30, and a string between the leading end 25 of the rotating arm 20 is passed from the take-out hole 37 to the leading end of the tension arm 40. A guide 41 is provided (claim 1).

  The leaf spring constituting the tension arm 40 is preferably formed with an elastic force that maintains the tension of the string during the binding operation to 20 N or less, preferably 10 N or less according to the object to be bound (Claim 2). ).

  It is preferable that the tension arm 40 bends the tension arm 40 in the longitudinal direction so that the tip portion faces the rear side in the rotation direction.

Furthermore, it is preferable that the tension arm 40 is formed so that the width on the tip side is narrower and / or the thickness is made thinner than the base side (Claim 4),
More preferably, it is preferably formed in a tapered shape that gradually narrows the width from the base side toward the tip side and / or reduces the thickness.

  With the configuration of the present invention described above, the following remarkable effects can be obtained in the automatic binding machine 1 of the present invention.

  Conventional tension arm mechanism is a combination of multiple members such as a tension shaft, a support shaft that pivotally supports the tension arm, a coil spring, a curved rod that externally fits the coil spring, and a locking portion that regulates the end position of the coil spring. In contrast, in the tension arm 40 of the present invention, the tension arm 40 itself is formed by a leaf spring, so that the same function as that of the conventional tension arm mechanism is achieved by a single component. I was able to.

  In addition, the tension arm 40 itself is a leaf spring, and the tip is biased in a direction away from the rotary arm 20, so that the tension applied to the cord 5 can be extremely reduced by adjusting the plate width and / or thickness and / or overall length. It became possible to maintain a weak state (20N or less, or 10N or less in the case of binding with an edible string).

  On the other hand, in the configuration of the present invention in which the tension arm 40 itself is a leaf spring, the above-described weak tension can be maintained, but damage or the like is hardly generated, and a highly reliable automatic binding machine can be provided. It was.

  Furthermore, as described above, the number of parts can be greatly reduced and the structure can be made extremely simple, so that assembly is easy and the manufacturing cost can be reduced, as well as disassembly and cleaning during maintenance. And reassembly work is easy.

  From the above points, the automatic binding machine according to the present invention is only applicable to binding using a low-strength string that could not be performed with an existing automatic binding machine, and binding of fragile objects to be bound. In addition, since hygiene management is easy due to the ease of disassembly and cleaning, an automatic binding machine that uses edible strings and is suitable for use in the manufacture of processed foods can be provided.

  In the configuration in which the tension arm 40 is curved in the longitudinal direction so that the tip end portion of the tension arm 40 faces the rear side in the rotation direction, the tension on the string can be increased when the rotation arm 20 starts rotating. Thus, the tension arm 40 can be easily deformed, and a sudden increase in tension can be suitably absorbed to make it difficult for the string to break.

  The tension arm 40 has a configuration in which the width on the tip side is narrower and / or the thickness is made thinner than the base side, and in particular, the width is gradually reduced from the base side toward the tip side, and / or the thickness is increased. In the taper-shaped configuration that reduces the tension, the tip side that is narrow or thin can be easily deformed even with a slight force. When the deformation position becomes higher and extends not only to the distal end side but also to the base side, a greater force is required to deform the tension arm 40, and it is difficult to generate a locked state in which the distal end portion does not move when it abuts against the rotating arm. In addition, the plastic deformation and fatigue failure of the tension arm could be avoided as much as possible.

The external appearance perspective view of the automatic binding machine of this invention. The enlarged view in the circle | round | yen shown with the dashed-dotted line in FIG. The expansion perspective view of a hollow shaft, a rotation arm, and a tension arm part. The front view of the state which attached the rotation arm and the tension arm to the hollow shaft. VV sectional view taken on the line of FIG. VI-VI sectional view taken on the line of FIG. The perspective view of a tension arm. Schematic explanatory drawing of the conventional automatic binding machine (corresponding to FIG. 1 of Patent Document 1).

  Below, the automatic binding machine 1 of this invention is demonstrated, referring an accompanying drawing.

  In FIG. 1, the external appearance perspective view of the automatic binding machine 1 of this invention is shown. The automatic binding machine 1 winds a string 5 that has passed through the gap G around an object to be bound W arranged so as to straddle the gap G formed between the first table 11 and the second table 12. The basic principle of winding the string 5 around the object to be bound W is the same as that of the conventional automatic binding machine described with reference to FIG.

  In the illustrated embodiment, the upper surface of the first table 11 is provided with a work guide 13 composed of two plates projecting upward as shown in FIG. A restriction plate 14 for restricting the placement position of the object to be bound W is also provided on the table 12, in a state of being brought into contact with the restriction plate 14 of the second table 12 and in the work guide 13 of the first table 11. The string 5 can be accurately wound around the object to be bound W by rotating the rotating arm 20 described later in a state where the object to be bound W is placed on the tables 11 and 12 so as to be inserted. It is configured.

  As shown in FIG. 3, a hollow shaft 30 that forms a rotation axis of the rotary arm 20 is provided on the back side of the drawing with respect to the first table 11 (on the opposite side to the second table 12). By mounting the arm 20, the rotating arm 20 is also rotated by rotating the hollow shaft 30.

  In the present embodiment, as shown in FIGS. 5 and 6, the hollow shaft 30 is constituted by a cylindrical guide shaft 31 and an arm holder 32 attached to one end side of the guide shaft 31. The rotary arm 20 is attached to the hollow shaft 30 by attaching the rotary arm 20 described above.

  As shown in FIGS. 4 to 6, a boss 33 for attaching the rotary arm 20 is projected at an intermediate position in the longitudinal direction of the arm holder 32 described above, and a predetermined angle in the rotational direction with respect to the boss 33. A pinion base 34 for mounting a pinion gear 35 to be described later is provided at a position shifted (90 ° in the illustrated embodiment), and further, a predetermined angle in the rotational direction with respect to the boss 33 and the pinion base 34. A take-out hole 37 for taking out the string inserted into the guide shaft 31 is formed at a position shifted by 180 ° with respect to the pinion base 34 in the illustrated embodiment.

  As described above, on both sides of the intermediate position where the boss 33, the pinion base 34, and the take-out hole 37 are formed, the arm holder 32 has a pair of fixed gears 36, 36 fixed to the main body portion or the like of the automatic binding machine 1. It is pivotally supported at the center so that it can rotate.

  As shown in FIG. 5, a shaft hole 34a for attaching a pinion gear 35 is formed on the tip side of the above-described pinion base 34, and pinion gears 35, 35 are provided at both ends of a shaft 34b pivotally supported by the shaft hole 34a. And the pinion gears 35 and 35 are meshed with the pair of fixed gears 36 and 36.

  Further, a sprocket 38 is attached to the end of the arm holder 32 on the guide shaft 31 side as shown in FIGS. 5 and 6, and rotation of a motor (not shown) is transmitted to the sprocket 38 via a chain. By being transmitted, the hollow shaft 30 is configured to rotate, and at the time of rotation, the pinion gears 35, 35 mesh with the fixed gears 36, 36 and revolve while rotating around the fixed gears 36, 36. , The stable rotation of the hollow shaft 30 is realized.

  The above-described rotary arm 20 attached to the arm holder 32 configured as described above is attached to a boss 33 provided on the arm holder 32 as shown in FIG. 3 and FIG. The base 21 is disposed in an orthogonal direction and the parallel portion 22 is disposed in parallel to the axial direction of the rotary shaft 20. The base 21 and the parallel portion of the rotary shaft 20 are configured. A ring-shaped guide 24 for passing a string through an elbow 23 that is a boundary portion with 22 and a guide ring 29 for passing a string also at a tip 25 that is an end of the parallel part 22 are provided. Yes.

  The tip 25 of the rotary arm 20 is formed on a plane passing through a gap G formed between the first table 11 and the second table 12 when the rotary arm 20 rotates as shown in FIG. The length of each part of the rotary arm 20 is set so as to move on the rotation path S.

  A tension arm 40 is further attached to the arm holder 32 described above. As shown in FIG. 3, the string taken out from the take-out hole 37 of the hollow shaft 30 is guided by a guide provided at the tip of the tension arm 40 ( After passing through the roller guide) 41, by passing it through the guide 24 provided on the elbow 23 of the rotary arm 20, the string 5 at this position is pulled out in a direction away from the rotary arm 20 by the tension arm 40. It is configured so that the tension applied to can be adjusted.

  In the automatic binding machine 1 of the present invention, the tension arm 40 is formed by a leaf spring, and the guide 41 for passing a string is attached to the tip of the tension arm 40 made of the leaf spring. The structure is adopted.

  In the illustrated embodiment, as shown in FIG. 7, the tension arm 40 is provided with a mounting base 42 formed in a U-shape opening downward in the drawing, and a pinion base provided on the arm holder 32 in the mounting base 42. The tension arm 40 is attached to the arm holder 32 by bolting the attachment base portion 42 to the pinion base 34, and a method for attaching the tension arm 40 to the arm holder 32 is shown in the figure. The present invention is not limited to this embodiment, and various other methods can be employed.

  The tension arm 40 deforms the distal end side relative to the base side by, for example, forming a width on the distal end side narrower and / or a thinner wall thickness on the distal end side than the base side on which the mounting base 42 is formed. Preferably, the tension arm 40 is formed in a tapered shape that gradually decreases in width and / or thickness as it goes toward the distal end, and the elastic force gradually increases from the base side toward the distal end side. It is preferable to form so as to decrease.

  The tension arm 40 is preferably attached to the arm holder 32 so that the tip side of the tension arm 40 faces rearward in the rotational direction.

  As an example, in the present embodiment, SUS304 (hard material) having a thickness of 0.4 mm is used, and the range of about 147 mm in the middle portion of the total length of the tension arm 40 of about 220 mm has a width of 30 mm to 12 mm. By forming the taper shape so as to be reduced, the tension applied to the string 5 can be kept relatively weak (for example, 20N or less, preferably 10N or less), and the occurrence of slack can be prevented. The tip of the tension arm 40 is made sticky by the taper shape so that the tip of the tension arm 40 approaches the rotary arm 20 and becomes difficult to deform as the deformation of the base of the tension arm 40 increases. Is prevented from falling into a locked state in which the movement is stopped in a state of being in contact with the rotary arm 20.

  Further, the taper-shaped portion of the tension arm 40 is curved in the length direction so that when attached to the arm holder 32, the tip end portion of the tension arm 40 faces rearward in the rotational direction. As a result, when the tension applied to the cord 5 rises, the tip of the tension arm 40 is easily bent in the direction approaching the rotary arm 20, so that the tension of the cord suddenly increases immediately after the rotation of the rotary arm 20 is started. Can be absorbed well.

  The guide provided at the tip of the tension arm 40 may be guided by attaching a ring-shaped member for passing the string 5 to the tip, but in this embodiment, as shown in FIG. The tip spring also bends the leaf spring into a U-shape to form a roller bracket 43, and a roller 45 is rotatably attached to a support shaft 44 attached to the roller bracket 43 to form a roller guide 41. The resistance given to the string 5 passing through the tip is reduced.

[Usage and action]
In the automatic binding machine 1 of the present invention configured as described above, the string 5 drawn from the string roll (not shown) is not subjected to resistance by a brake means or the like, or is subjected to weak resistance. 3, the roller guide provided at the tip of the tension arm 40 is inserted into the hollow shaft (guide shaft 31) from the end of the hollow shaft 30 and taken out from the take-out hole 37 provided in the arm holder 32. 41, and then passed through a guide 24 provided on the elbow 23 of the rotary arm 20 and a guide ring 29 provided on the tip 25 of the rotary arm, and then the tip thereof is locked to the string lock button 7.

  In this state, when the hollow shaft 30 is rotated by a motor (not shown), the string drawn from the tip 25 of the rotary arm 20 is wound around the object W for one or more turns, and the string thus wound is wound. Are tied by a knotter (not shown) and cut by a cutter (not shown) to complete the binding.

  During winding of the string 5, a string having a length corresponding to the outer peripheral length of the object to be bound W is pulled out from the distal end portion 25 of the rotary arm 20, and the string 5 is pulled out in this way and added to the string 5. When the tension increases, the string drawn from the roll is drawn from the take-out hole 37 via the hollow shaft 30 (guide shaft 31).

  At this time, the tension arm 40 is deformed so that the tip thereof approaches the rotary arm 20, so that the resistance applied to the string when passing through the hollow shaft 30 (guide shaft 31) or the extraction hole 37 (the brake means is applied). If it is provided, it absorbs the increase in tension applied to the cord 5 caused by the presence of the resistance (provided by the brake means) and suppresses it below a certain range, thereby preventing the cord break caused by excessive tension rise. In addition to preventing, binding failures caused by loosening of the string are prevented.

  Here, when the urging force applied by the tension arm 40 is large, the tension arm 40 is always present at a position farthest from the rotary arm 20 unless a large resistance is applied to the string 5 by the brake means described as the prior art. And the slack of the string cannot be absorbed.

  However, in the tension arm 40 of the present invention formed by a leaf spring, the urging force can be made weak by selecting the material, plate thickness, plate width, etc. of the tension arm 40. As a result, the brake means Thus, the resistance applied to the string is made weak, or the brake means itself is excluded from the device configuration, and the string 5 is applied with very weak resistance such as contact resistance with the passage in the guide shaft 31 and the extraction hole 37. Even in the absence of the tension, the tensioning force of the tension arm 40 can be balanced with such a weak resistance to prevent the string 5 from slackening. As a result, the string has a tensile strength of about 10N. Even when a very low strength material such as an edible string is used, it is possible to prevent the string from being broken due to an increase in tension during the binding operation. Even when a fragile object to be bound W such as a tie is bound, the string 5 can be prevented from biting into the object to be bound W, or the object to be bound W can be prevented from being cut by the string 5, and the string 5 is slackened. Therefore, it is possible to suitably prevent the binding failure.

  In particular, in the tension arm 40 formed in a tapered shape that narrows the width from the mounting base 42 side toward the distal end as described above, the narrower distal end is deformed flexibly with a slight force, while the tension arm 40 As the force applied to 40 increases and the amount of deformation on the mounting base 42 side increases, a greater force is required for the deformation. While this is absorbed, it is also possible to suitably prevent the tension arm 40 from being excessively deformed and the tip of the tension arm 40 abutting against the rotary arm 20 and locking in a stopped state. It has become.

  As described above, the automatic binding machine 1 of the present invention adopts a new structure that does not exist in the conventional automatic binding machine in which the tension arm 40 itself is configured by a leaf spring, and thus has a relatively simple configuration. , It is possible to bind with extremely weak tension that could not be done with existing automatic binding machines, and low-strength strings such as edible strings that could not be bundled with existing automatic binding machines (for example, tensile strength of 10 N or less Not only has a remarkable effect that it can be automatically performed even with binding using a string) or binding of a fragile object W, but also the structure of the tension arm 40 can be simplified. As a result, it was possible to make the automatic binding machine 1 hard to break and excellent in maintainability.

DESCRIPTION OF SYMBOLS 1 Automatic binding machine 5 String 7 String locking button 11 1st table 12 2nd table 13 Work guide 14 Control board 20 Rotating arm 21 Base 22 Parallel part 23 Elbow 24 Guide 25 Tip 29 Guide ring 30 Hollow shaft 31 Guide shaft 32 Arm holder 33 Boss 34 Pinion base 34a Shaft hole 34b Shaft 35 Pinion gear 36 Fixed gear 37 Extraction hole 38 Sprocket 40 Tension arm 41 Guide (roller guide)
42 Mounting base 43 Roller bracket 44 Support shaft 45 Roller 100 Automatic binding machine 105 String 107 String locking button 111, 112 Table 120 Rotating arm 125 Tip 126-129 Guide 130 Hollow shaft 137 Extraction hole 140 Tension arm 141 Roller guide 146 Curve Rod 147 Coil spring 148 Support shaft 149 Support member 160 Brake means G Interval (between tables)
W Bundled object S Rotating track (at the tip of the rotating arm)

Claims (5)

A hollow shaft having one end as an insertion port for a string and a take-out hole for taking out the string on the side surface near the other end, and a tip portion through which the string taken out from the take-out hole is passed, together with the hollow shaft A substantially L-shaped rotating arm that rotates to move the tip portion on a predetermined rotation path, a cord locking button that locks the tip portion of the cord passed through the tip portion of the rotating arm, A tension arm that draws a string extending from the take-out hole between the distal end portions of the rotary arm in a direction away from the rotary arm and applies a predetermined tension to the string is provided. In an automatic binding machine capable of winding a string around an object to be bound arranged inside the rotation track of the tip,
The tension arm is formed by a leaf spring whose base side is fixed to the hollow shaft, and a guide is provided on the distal end side of the tension arm to pass a string between the distal end of the rotary arm from the take-out hole. Automatic bundling machine featuring.   2. The automatic binding machine according to claim 1, wherein the leaf spring constituting the tension arm is formed with an elastic force that maintains the tension of the string at 20 N or less during the binding operation.   The automatic binding machine according to claim 1 or 2, wherein the tension arm is bent in the longitudinal direction so that the tip end portion of the tension arm faces the rear side in the rotation direction.   The automatic binding machine according to any one of claims 1 to 3, wherein the tension arm is formed so that a width on a distal end side is narrower and / or a thickness is made thinner than the base side.   The automatic binding according to any one of claims 1 to 3, wherein the tension arm is formed in a tapered shape that gradually decreases in width and / or decreases in thickness from the base side toward the tip side. Machine.

Images