JP2020117278A - Band reel of packing machine - Google Patents

Abstract

To provide a packing machine band reel that can wind coil springs by appropriate winding and tightening amount and reduce impact on the band at the end of winding.SOLUTION: On a supporting mechanism 60 supporting a reel shaft 12 rotating together with a band reel body 11 is formed a cylindrical coil spring chamber 64 surrounding the reel shaft 12, while the outer peripheral side of a coil spring 65 is stored in the coil spring chamber 64 without being fixed in contact with the inner peripheral surface 64a of the coil spring chamber 64 coated with silicon rubber, a reel support mechanism 60 is provided with a braking means 50 for varying rotational resistance applied to the reel shaft 12. As a result, the coil spring 65 idles in the coil spring chamber 64 by a predetermined winding and tightening amount to maintain the proper winding and tightening amount, and at the same time, with the braking means 50 applying appropriate rotation resistance to the reel shaft 12, impact on the band is mitigated when reverse rotation of the band reel body 11 is stopped.SELECTED DRAWING: Figure 5

Description

The present invention relates to a band reel provided in a packing machine for winding a band around an object to be packed for packing, and more specifically, it automatically removes an excessive band generated when winding and tightening the band around the object to be packed. The present invention relates to a band reel with a built-in spring spring that can be wound up with.

In the packing machine 100 that wraps the band B around the article W to be packed, as shown in FIG. 7, a table 107 on which the article W is placed and a band around which the band B such as a PP band used for packing is wrapped. A reel unit 111, a roller unit 120 for pulling out the band B from the band reel unit 111 and sending the band B onto the table 107, and a unit for pulling back the sent band B, and an end of the band B arranged below the table 107. A seal unit 140 is provided for gripping the portion and cutting and welding the band B.

In such a packing machine 100, the main roller 121 of the roller unit 120 is normally rotated (counterclockwise in the illustrated example) to pull out the band B from the band reel body 111 and send it out onto the table 107 (see FIG. A)], When the band B is sent out for a predetermined length, the roller unit 120 stops and the sending out of the band B is completed.

In this manner, when the band B is sent to the table 107 by a predetermined length and the roller unit 120 is stopped, the user forms a loop so as to form a loop surrounding the outer circumference of the article W placed on the table 107. When the tip of B is inserted into a predetermined position of the seal unit 140 arranged below the table 107 [see FIG. 7(B)], the seal unit 140 is detected by the detection signal of the sensor detecting that the tip of the band B is inserted. The band gripping mechanism grips the front end of the band B, and the main roller 121 of the roller unit 120 starts reverse rotation (clockwise rotation in the illustrated example) to pull back the band B, so that the object W to be packed. The band B is wound around the outer periphery and the wound band B is tightened [see FIG. 7(C)].

When the winding and tightening of the band B on the outer periphery of the object to be packed W is completed in this way, the seal unit 140 cuts the band B and welds the ends of the band B, so that the object to be packed W is bound by the band B. Packing is completed.

In the packing machine 100 configured as described above, when the band B is pulled back by the roller unit 120, the pulled back band B is accumulated between the roller unit 120 and the band reel body 111 [FIG. 7(C)]. reference〕.

Therefore, as in the case of packing a small article W to be packed, when the length of the band B to be pulled back becomes long, the length of the band B accumulated between the roller unit 120 and the band reel body 111 also becomes long, and the accumulated band is accumulated. When the band B is entangled or twisted, the band B which is entangled or twisted during the next band feeding cannot be fed out by being caught in the band feeding path. Occurs.

In order to prevent such a malfunction, a spring is built into the band reel 110 to rotate the band reel body 111 when the band B is pulled out (hereinafter, the band reel body 111 when the band B is pulled out. The rotation of the spring is referred to as “forward rotation”) to store the force in the spring, and when the roller unit 120 starts pulling back the band B, the force of the spring causes the band reel body 111 to move to the band reel main body 111. The band pulled back by the roller unit 120 is rotated between the roller unit 120 and the band reel main body 111 by rotating the band reel main body 111 in the winding direction (hereinafter, the rotation of the band reel main body 111 in the winding direction). A packing machine equipped with a band reel with a built-in spring spring that prevents B from accumulating has also been proposed.

In such a band reel with a built-in spring, when the band B is sent out by the roller unit 120, if the band B is further sent out even after the main spring 165 has been tightened to a certain extent, the spring is further wound. There is also proposed a structure in which the band B can be sent out without tightening.

As such a band reel 110 with a built-in spring spring, in Patent Document 1 described later, as shown in FIG. 8, a band reel body 111 is rotatably attached to the outer periphery of a shaft 112 fixed to a bracket. In the band reel 110, one end of the main spring 165 is fixed to the side plate 111a of the band reel body 111, and the other end is fixed to the spring receiver 117 provided on the reel shaft 112, and the end plate 118 provided at the end of the reel shaft 112, By mounting the spring 200 between the friction plate 119 fitted to the reel shaft 112 and pressing the friction plate 119 and the spring receiver 117 into contact with each other, the band is further tightened with the mainspring spring 165 tightened to a certain extent. When sent, a band reel 110 is also proposed in which the band B can be sent out without further tightening the mainspring spring 165 by slipping between the spring receiver 117 and the friction plate 119 (claim of patent document 1). 1).

Japanese Utility Model Publication No. 2-37803

In the band reel 110 described in Patent Document 1 described with reference to FIG. 8, the biasing force of the spring 200 is adjusted by tightening the tightening nut 102 to appropriately set the frictional force between the spring receiver 117 and the friction plate 119. By doing so, when the mainspring spring 165 is tightened by a predetermined amount or more, slippage occurs between the spring receiver 117 and the friction plate 119, and the band can be sent out without further tightening the mainspring spring 165. ..

However, in the band reel 110 having the above configuration, if the tightening nut 102 is not properly adjusted and the biasing force of the spring 200 is excessively increased, even if the main spring 165 is tightened to a certain extent, the spring bearing 117 is tightened. Since the band reel main body 111 stops rotating without sliding between the friction plate 119 and the friction plate 119, the band B having a required length cannot be fed, and the spring spring 165 wound beyond the winding tightening limit is damaged. May occur.

Further, in the packing machine 100 including the band reel 110 having the power spring incorporated therein, the band B pulled back to the band reel body 111 side by the pulling back of the band B by the roller unit 120 is reversed by the spring spring 165. Since the band is wound up, the band is not accumulated between the roller unit 120 and the band reel main body 111, so that the accumulated band B is entangled or twisted, resulting in malfunction of the band B such as biting. It's getting harder.

However, the pullback of the band B by the roller unit 120 driven by the electric motor is performed at a relatively higher winding speed than the initial stage of the pullback start, while the reverse operation of the band reel body 111 is relatively heavy. Is reversed by the force of the spiral spring 165, the inertia reduces the winding speed at the beginning of the operation.

As a result, there is a delay in winding the band B by the band reel main body 111 with respect to the pulling back of the band by the roller unit 120. As a result, the slack in the band B between the roller unit 120 and the band reel main body 111 occurs.

Due to the occurrence of the slack, the band reel body 111 pulls the band B taut when the band reel body 111 winds up the slack band B after the roller unit 120 stops and the pulling back of the band B is completed. When the band B receives the rotational force of the band reel body 111, the reverse rotation is stopped.

As a result, when the band reel main body 111 stops the reverse rotation, the tension of the band B instantaneously increases, and the band B wound around the article W with an appropriate strength is tightened by the roller unit 120. ，By increasing this tension, it is tightened further.

The tension applied to the band B at this time becomes larger as the remaining amount of the band B wound around the band reel main body 111 is large and the weight of the band reel main body 111, and thus the inertial force, is increased. The larger the force stored in the mainspring mounted on the reel 110, the larger the force.

In the conventional packing machine 100, the increase in the tension of the band B generated when the band reel 110 having the spiral spring is stopped is applied to the band B as it is without being attenuated, and the increased tension causes the object W to be packed to be packed. Since the tightening force against the object to be packaged is increased, when the fragile object to be packaged W is to be packaged, the object to be packaged may be damaged, and even when used to package the fragile object to be packaged W. There is a demand for a packing machine 100 including a band reel 110 capable of packing with high reliability without damaging the object W to be packed.

On the other hand, if the rotational force of the band reel body 111 that reverses by weakening the force stored in the mainspring 165 is reduced, the tension increase of the band B can be suppressed, but the required amount of the band B cannot be wound and the roller B cannot be wound. The band B accumulates between the unit 120 and the band reel main body 111, which causes entanglement of the band and twisting of the band, resulting in defective operation due to biting of the band.

Therefore, it is necessary to prevent the tension of the band from increasing when the band reel body 111 is stopped, without weakening the winding force of the main spring 165.

Therefore, the present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and has a relatively simple structure, and the length of the band sent out by the roller unit further without any special adjustment or the like. Regardless of this, it is possible to wind the mainspring with an appropriate amount of winding, and therefore, it is possible to prevent insufficient winding of the band and to prevent the mainspring from being damaged by being wound more than necessary. The object is to provide a band reel that can be used.

Further, the present invention prevents the tension of the band from rapidly increasing when the band reel is stopped, and even if a weak object to be packed is packed, it can be packed with high reliability without being damaged. It is intended to provide a band reel for a packing machine.

The means for solving the problems will be described below together with the reference numerals used in the embodiments for carrying out the invention. This code is for clarifying the correspondence between the description of the claims and the description of the mode for carrying out the invention, and needless to say, it is limitedly used for the interpretation of the technical scope of the present invention. It is not something that can be done.

In order to achieve the above object, the band reel 10 of the packing machine 1 of the present invention is
In the band reel 10 provided in a band reel 10 and a packing machine provided with a band B that is pulled out from the band reel 10 and sent out, and the band B that has been sent out is pulled back and wound around the outer periphery of the article W to be packed,
The band reel body 11 around which the band B is wound, the reel support mechanism 60 that rotatably supports the band reel body 11, the reel shaft 12 that forms the center of rotation of the band reel body 11, and the reel shaft 12. A cylindrical spring spring chamber 64 covering the outer periphery and a spring spring 65 accommodated in the spring spring chamber 64 are provided.
The mainspring spring 65 is accommodated in the mainspring spring chamber 64 while being in contact with the inner peripheral surface 64a of the mainspring spring chamber 64 without fixing the outer peripheral end side thereof,
An inner peripheral end 65a of the main spring 65 is configured to be engageable with the reel shaft 12,
One of the reel shaft 12 and the spring spring chamber 64 is fixed to the reel support mechanism 60, and the other is provided on the band reel body 11 (claim 1).

It is preferable that the inner peripheral surface 64a of the main spring chamber 64 is internally coated with, for example, silicon rubber having a constant friction coefficient by coating or the like (claim 2).

Further, the band reel 10 of the present invention can be further provided with a brake means 50 for varying the rotational resistance applied to the band reel body 11 (claim 3).

In the structure in which the reel shaft 12 is provided in the band reel body 11, such a braking means 50 has a bolt hole 51 communicating with the shaft hole 62 into which the reel shaft 12 is inserted in a direction orthogonal to the bolt hole 51, and the bolt hole 51. It can be configured by bringing the tip of the resin rod, which is urged by a spring provided at the tip of the bolt inserted into 51, into contact with the reel shaft 12 (claim 4).

Further, it is desirable to attach a resin rod 53 such as urethane or nylon having a constant coefficient of friction to the tip of the rib of the bolt hole 51 of the braking means 50 (claim 5).

Further, the reel shaft 12 is provided with an engagement protrusion 14 protruding in the outer peripheral direction,
The inner peripheral end 65a of the main spring is provided with a locking claw 66 formed by folding back the inner peripheral end 65a on the inner peripheral side, and the inner peripheral end 65a of the mainspring spring 65 is fixed to the reel shaft 12 without The engaging claw 66 and the engaging projection 14 may be engaged with each other in a disengageable manner (claim 6 ).

With the configuration described above, in the band reel 10 of the present invention, the mainspring spring 65 is kept in contact with the inner peripheral surface 64a of the mainspring spring chamber 64 without fixing the outer peripheral end side to the inside of the mainspring spring chamber 64. It is housed inside.

In this state, when the inner peripheral end 65a of the mainspring spring 65 is engaged with the reel shaft 12 to tighten the mainspring spring 65, the mainspring spring 65 is deformed so as to reduce its outer diameter [FIG. 6(A)]. , (B)], the contact resistance between the outer peripheral end side of the mainspring spring 65 and the inner peripheral surface 64a of the mainspring spring chamber 64 decreases as the winding is advanced.

Therefore, in the configuration of the present invention, the spring spring 65 starts idling in the spring spring chamber 64 when the spring spring 65 is wound by a predetermined amount without any adjustment work. It is prevented from being broken and damaged.

Further, if the mainspring spring 65 is tightened more than necessary and the excessive force is stored in the mainspring spring 65, even if the band reel body 11 finishes winding the band B, the mainspring spring 65 is still in the state of storing the force. When the reverse rotation of the band reel 10 is stopped, the tension of the band B is significantly increased. However, in the band reel 10 of the present invention, the spring spring 65 is wound to an appropriate strength, so that It is possible to prevent the tension of the band B from excessively increasing at the time of stop, and as a result, even the fragile object W to be packed can be packed without causing damage or the like.

In addition, in the structure in which the outer peripheral end side of the mainspring spring 65 is not fixed in the mainspring spring chamber 64 but is in contact with the inner peripheral surface 64a of the mainspring spring chamber 64, the outer peripheral end side of the mainspring spring 65 and the inner peripheral surface 64a of the mainspring spring chamber 64 are When the contact resistance is small, the spring spring 65 starts idling only by slightly winding it.

Further, when the mainspring spring 65 idles, the spring spring 65 releases a part of the stored force and its outer peripheral end contacts the inner peripheral surface 64a of the mainspring spring chamber 64, and the contact resistance capable of stopping the idle rotation is restored. When the contact resistance between the outer peripheral end side of the mainspring spring 65 and the inner peripheral surface 64a of the mainspring spring chamber 64 is low, the force released during idling increases and the spring spring 65 stores sufficient force. In particular, when the roller unit 20 finishes feeding the band immediately after the mainspring spring 65 idles and further tightening of the mainspring spring 65 is not performed, the band B pulled back by the roller unit 20 is completely wound. There may be cases where it cannot be taken.

However, in the structure in which the inner peripheral surface 64a of the mainspring spring chamber 64 is coated with silicone rubber, the frictional resistance between the outer peripheral end side of the mainspring spring 65 and the inner peripheral surface 64a of the mainspring spring chamber 64 increases, so that the mainspring spring 65 that starts idling. It is possible to increase the winding tightening amount of the spring, and even when idling occurs, the force stored in the spring spring 65 is required by immediately recovering the contact resistance and stopping idling after the idling starts. As a result, it is possible to prevent the band B from being released, and as a result, the entire amount of the band B can be wound even when the roller unit 20 has finished feeding the band immediately after the mainspring spring 65 has idled.

Further, in the configuration in which the brake means 50 that makes the rotation resistance applied to the band reel main body 11 variable is provided, by giving an appropriate resistance to the rotation of the band reel main body 11, the band reel main body 11 can be rotated without resistance as compared with the case where the band reel main body 11 is rotated. It is possible to stop the reverse rotation of the reel body 11 quickly and gently, and to reduce the impact given to the band B when the band reel body 11 stops the reverse rotation. Even in the case of the object, it was possible to prevent the tightening force of the band B from increasing and damaging the object W to be packed.

The reel shaft 12 is provided on the band reel body 11, and the above-mentioned braking means 50 is screwed into the bolt hole 51 and the bolt hole 51 that communicates with the shaft hole 62 in the orthogonal direction. When the bolt 52 is used, the rotation resistance applied to the band reel body 11 can be finely adjusted by adjusting the screwing depth of the bolt 52, although the bolt 52 has a relatively simple structure.

Particularly, in the structure in which the resin rod 53 having a constant friction coefficient such as urethane or nylon is attached to the tip of the spring 54 inserted in the bolt 52, the rotation resistance applied to the band reel body 11 is prevented from becoming excessive, In addition to providing an appropriate rotational resistance, it is possible to further finely adjust the rotational resistance, and in the structure in which the resin rod 53 having a constant friction coefficient is inserted at the tip of the spring 54 provided at the tip of the bolt 52, When the resin rod is worn out, it can be easily regenerated by replacing it with a new resin rod.

Further, the reel shaft 12 is provided with an engaging projection 14 protruding in the outer peripheral direction, and an inner peripheral end 65a of the mainspring spring is provided with a locking claw 66 formed by folding the inner peripheral end 65a toward the inner peripheral side. In the configuration in which the inner peripheral end 65a of the mainspring spring 65 is releasably engaged with the locking claw 66 and the engagement protrusion 14 without being fixed to the reel shaft 12, the mainspring spring 65 is fully extended. Further, when the band reel main body 11 reversely rotates due to inertia or the like, the engagement between the engagement protrusion 14 and the locking claw 66 is released, and the band reel main body 11 is reversely rotated in a state of being separated from the main spring 65, whereby the main spring 65 is damaged. It was possible to prevent appropriately.

The front schematic diagram of the packing machine equipped with the band reel of the present invention. The rear schematic of the packing machine equipped with the band reel of the present invention. The perspective view of the band reel in the state where it was attached to the packing machine. The front view of the bearing box part provided in the support mechanism of a band reel. FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4 with the band reel body attached. FIG. 6 is an explanatory view of an engagement state of a locking claw provided on an inner peripheral end of a mainspring and an engagement projection provided on a reel shaft. FIG. 6A shows that the band reel body starts to rotate in a normal state when the mainspring is fully extended. The state in which the mainspring is started to be wound, (B) is the state in which the band reel body is reversed while the wound spring is released, and (C) and (D) are the state in which the mainspring is fully extended and the band reel body is further extended. Reversed state. It is explanatory drawing of the conventional packing machine, (A) at the time of band delivery, (B) after band delivery, before starting pulling back, (C) at the time of band pulling back. Sectional drawing of the principal part of the conventional band reel with a built-in spiral spring (corresponding to FIG. 1 of Patent Document 1).

The band reel 10 of the packing machine 1 of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a packing machine 1 to which the band reel 10 of the present invention is applied has a table 7 on which an object W to be packed is placed and a band B such as a PP band used for packing. A band reel 10 having a band reel body 11, a roller unit 20 for pulling out the band B from the band reel body 11 for a predetermined length and sending the band B onto the table 7, and a table for pulling the sent band B back. And a sealing unit 40 for gripping the end portion of the band B and cutting and welding the band B.

Then, the band B sent out onto the table 7 by the roller unit 20 has a tip end thereof which is predetermined by the user to arrange the sealing unit 40 below the table 7 so as to form a loop surrounding the outer periphery of the article W to be packed. , The roller gripper 20 of the seal unit 40 grips the tip of the band B, and the roller unit 20 pulls back the band B to wind and tighten the band B around the article W to be packed, and then the seal. The point that the unit 40 cuts the band B and welds the ends of the band to complete the packing is the same as in the conventional packing machine described with reference to FIG. 7.

The band reel 10 of the present invention which is applied to the packing machine 1 configured as described above is a band reel with a built-in spring that has a built-in spring spring 65. By winding the band B with the force of the spring spring 65, The retracted band B is prevented from accumulating between the roller unit 20 and the band reel body 11.

The band reel 10 includes a band reel body 11 around which the band B is wound, a reel shaft 12 that rotates together with the band reel body 11, and a reel support mechanism 60 that supports the reel shaft 12 and is a support arm in the illustrated example. (See FIG. 5).

As shown in FIG. 4, the support arm 60 is provided with a bearing box 61 having a shaft hole 62 into which the reel shaft 12 is inserted. The bearing box 61 has a shaft hole 62 in which a bearing ( A bearing) 63 is inserted, and the shaft 12 is supported by the bearing 63.

In the bearing box 61, a cylindrical space surrounding the outer circumference of the reel shaft 12 is formed as a spring spring chamber 64 on the band reel body 11 side from the mounting position of the bearing 63 described above (see FIGS. 4 and 5). ), the mainspring spring 65 is housed in the mainspring spring chamber 64.

The mainspring spring 65 accommodated in the mainspring spring chamber 64 is in contact with the inner peripheral surface of the mainspring spring chamber 64 while being pressed against the inner peripheral surface of the mainspring spring chamber 64 by the force of the mainspring spring 65 itself expanding without fixing the outer peripheral end side thereof in the mainspring spring chamber 64. It is housed as

As described above, the inner peripheral surface 64a of the mainspring spring chamber 64, which is in contact with the outer peripheral end side of the mainspring spring 65, may be the same material as the material of the bearing box 61, such as resin, metal, or ceramics, but the friction resistance By coating with a large material, preferably silicon rubber, the contact resistance with the outer peripheral end side of the main spring 65 is increased.

As shown in FIG. 4, the mainspring spring 65 is provided with a locking claw 66 formed by folding back the inner peripheral end 65a toward the inner peripheral side. The locking claw 66 is provided on the reel shaft 12. The mating protrusion 14 (see FIGS. 5 and 6) can be engaged.

In the illustrated configuration, the locking claw 66 formed on the inner peripheral end 65a of the main spring 65 is formed by folding back the inner peripheral end 65a of the main spring 65 in a U shape. The shapes are not limited to those shown in FIGS. 4 and 6, and may be formed by folding back in a V shape, for example.

In this way, the locking claw 66 provided on the inner peripheral end 65a of the main spring 65 is formed by folding back the inner peripheral end 65a of the main spring 65 on the inner peripheral side. As a result, as shown in FIG. When the engaging projection 14 provided on the reel shaft 12 rotates counterclockwise on the paper surface due to the normal rotation of the main body 11, the engaging projection 14 engages with the locking claw 66, and the mainspring spring 65 is tightened.

Further, as shown in FIG. 6B, when the inner peripheral end 65a of the mainspring spring 65 is moving clockwise in the drawing with the mainspring spring 65 being wound and tightened to store the force, the inner periphery of the mainspring spring 65 is reduced. The locking claw 66 provided on the end 65a engages with the engaging projection 14 provided on the reel shaft 12, and the spring shaft 65 rotates the reel shaft 12 clockwise in the drawing, whereby the band reel body 11 is reversed. ..

However, as shown in FIG. 6(C), when the main body spring 11 is fully extended and the band reel body 11 is further reversed due to inertia or the like and the engaging projection 14 rotates clockwise in the drawing, the engaging projection 14 and the engaging projection 14 are rotated. The engagement with the locking claw 66 is released, and the band reel body 11 is separated from the main spring 65 and rotates.

Moreover, as shown in FIG. 6(D), the locking claw 66 is formed by folding the inner peripheral end 65a of the main spring 65 inward, so that the band reel body 11 continues to rotate in the reverse direction. When the collision with the locking claw 66 in the clockwise direction occurs, the inner peripheral end 65a of the main spring 65 is pushed away in the outer peripheral direction by this collision, and the band reel body 11 can be reversed while being further separated from the main spring 65. ing.

As a result, the mainspring spring 65 is prevented from further rotating in the clockwise direction on the paper surface from the fully extended state, whereby damage to the mainspring spring 65 and the like can be prevented.

The above-mentioned support arm 60 that supports the reel shaft 12 is further provided with a braking means 50 that makes the rotational resistance applied to the reel shaft 12 variable.

Although various known structures can be adopted as the braking means 50, in the present embodiment, as shown in FIG. 5, the braking means 50 communicates with the shaft hole 62 provided in the bearing box 61 in a direction orthogonal to the shaft hole 62. A bolt hole 51 is provided, a bolt 52 is screwed into the bolt hole 51, and the tip of the bolt 52 is inserted into the shaft hole 62 and brought into contact with the outer circumference of the reel shaft 12. The braking means 50 is configured so that the rotation resistance applied to the reel shaft 12 can be changed by adjustment.

It is preferable to attach a resin rod 53 having a constant friction coefficient such as urethane or nylon to the tip of the bolt 52 that constitutes the braking means 50. In the present embodiment, as shown in an enlarged view in FIG. The tip of the bolt 52, which is in contact with the outer circumference of the reel shaft 12, is formed by a resin rod 53 having a constant friction coefficient, and when the rod of the resin rod 53 is worn out, it can be easily replaced. did.

As shown in FIGS. 1 to 3, the guide roller 31 is provided at the outer peripheral position of the band reel body 11 which is rotatably supported by the support arm 60 as described above, and the band B pulled out from the band reel 10 is provided. Is hung on the outer circumference of the guide roller 31 to change its direction and then introduced into the roller unit 20.

The guide roller 31 is rotatably attached to the other end 32b side of a swing arm 32 whose one end 32a side is pivotally supported so that the guide roller 31 can be moved by the swing movement of the swing arm 32. It is configured to be movable so that the distance between and can be expanded or contracted.

The structure of the swing arm 32 is not particularly limited as long as it can move the guide roller 31 toward and away from the roller unit 20 at the outer peripheral position of the band reel body 11, but preferably the structure is As shown in FIGS. 2 and 3, one end 32a side of the swing arm 32 is coaxially supported with the reel shaft 12, and the guide roller 31 is configured to move on the concentric outer circumference of the band reel 10.

With such a configuration, in the front view shown in FIG. 1, most of the swing arm 32 is arranged at a position overlapping the band reel 10 (the back side of the band reel 10) and the swing arm 32 is provided. The packing machine 1 does not have a large protrusion and can have a compact shape as a whole, while the guide roller 31 can have a relatively large movement width and can absorb a large slack of the band B. Has become.

The swing arm 32 is provided with an urging means 33 for urging the swing arm 32 in a direction to move the guide roller 31 away from the roller unit 20. In this embodiment, a coil spring is used as the urging means 33. doing.

The urging of the swing arm 32 by the urging means 33 moves the guide roller 31 to a position farthest from the roller unit 20 in a state where no tension is applied to the band B, while the roller unit 20 sends out the band B. When tension is applied to the band B, the guide roller 31 is urged so that the guide roller 31 can move to a position close to the roller unit 20.

The tension applied to the band B by the roller unit 20 when the band B is sent out increases as the rotation resistance of the band reel body 11 increases.

Therefore, when the roller unit 20 sends out the band B, the adjustment so that the guide roller 31 moves to the position close to the roller unit 20 is performed by changing the biasing means 33 or changing the mounting position. In the packing machine 1 of the present embodiment which is provided with the braking means 50 that makes the rotation resistance of the reel shaft 12 variable, not only by adjusting the urging force on the side, the braking means 50 is operated. It may be adjusted by changing the rotational resistance applied to the reel shaft 12.

[Action, etc.]
In the packing machine 1 including the band reel 10 of the present invention configured as described above, when the band is sent out by the roller unit 20, the band B wound around the band reel body 11 is pulled out, and the band reel is pulled out. The main body 11 and the reel shaft 12 rotate, and the engagement protrusion 14 provided on the reel shaft 12 rotates counterclockwise in the drawing as shown in FIG. 6(A).

As a result, the engagement protrusion 14 and the locking claw 66 provided on the inner peripheral end 65a of the mainspring spring 65 are engaged with each other, and the tightening of the mainspring spring 65 is started.

The mainspring spring 65 is housed in the mainspring spring chamber 64 such that the outer peripheral end side thereof is pressed and comes into contact with the inner peripheral surface 64a of the mainspring spring chamber 64 by the force of expansion of itself, and the mainspring spring 65 is not wound. In this state, the outer peripheral end side of the mainspring spring 65 is pressed against the inner peripheral surface 64a of the mainspring spring chamber 64 so as not to slip.

From this state, as the mainspring spring 65 is tightened, the mainspring spring 65 moves toward the inner peripheral side and deforms so as to narrow the outer diameter [see FIG. 6(B)]. When the force of pressing the outer peripheral end side of the mainspring spring 65 gradually decreases and the mainspring spring 65 is tightened by a predetermined number of turns, the outer peripheral end side of the mainspring spring 65 slips on the inner peripheral surface 64a of the mainspring spring chamber 64 and the mainspring spring 65 idles. ..

At the time of idling, the spring spring 65 releases part of the force accumulated by winding, and the idling is stopped by expanding the outer diameter until the contact resistance at which idling is stopped is restored. When the band B is continuously fed by the above, the winding of the mainspring spring 65 is restarted from this state, and by repeating this operation, the mainspring spring 65 is wound to a state less than the predetermined winding limit. Therefore, damage is prevented.

In the configuration of the band reel 10 of the present invention, the force stored in the mainspring spring 65 by winding is the maximum value immediately before the mainspring spring 65 starts idling, and after the idling starts, the force between the innerspring surface 64a of the mainspring spring chamber 64 is increased. When the contact state is restored by and the idling stops, part of the stored force is released and lost.

Therefore, in the state where the contact resistance between the outer peripheral end side of the mainspring spring 65 and the inner peripheral surface 64a of the mainspring spring chamber 64 is small and the mainspring spring 65 easily idles, the maximum value of the force stored in the mainspring spring 65 becomes low. Since it takes a long time to recover the state of contact with the inner peripheral surface 64a of the mainspring spring chamber 64 and stop the idling, more force is released and lost. When the feeding of the band by 20 is stopped and the further tightening of the spiral spring 65 is not performed, the spiral spring 65 has a sufficient tightening force to wind the entire amount of the band B pulled back by the roller unit 20 onto the band reel body 11. An unstored condition can occur.

From the above point, in the present embodiment, the inner peripheral surface 64a of the mainspring spring chamber 64 is coated with silicon rubber to increase the contact resistance between the outer peripheral end side of the mainspring spring 65 and the inner peripheral surface 64a of the mainspring spring chamber 64. By increasing the maximum value of the force stored in the mainspring 65 and recovering the contact resistance early when idling occurs, the mainspring can be tightened with a proper amount of winding and with little variation. I am able to do it.

After the delivery of the band by the roller unit 20 is completed as described above, the end of the band B is sealed by the user so that the user forms a loop surrounding the outer circumference of the article W placed on the table. When the seal unit 40 is inserted into the predetermined position of the band 40, the seal unit 40 grips the end portion of the inserted band B, the main roller 21 of the roller unit 20 starts reverse rotation, and the pullback of the band B is started.

In this way, when the band B is returned from the roller unit 20 to the band reel body 11 side by the pulling back of the band B by the roller unit 20, the band in which the rotational force in the reverse direction is given by the spiral spring 65. The reel body 11 reverses to start winding the band.

At this time, when there is a delay in winding the band by the band reel main body 11 with respect to the pulling back of the band by the roller unit 20 and a slack occurs in the band B between the roller unit 20 and the band reel main body 11, this slack is The swing arm 32 is swung by the biasing force of the biasing means 33, and the guide roller 31 is absorbed by being moved in a direction away from the roller unit 20.

Further, when the winding of the band B is not completed even when the mainspring spring 65 is fully extended while the band B is wound around the band reel main body 11, the band reel main body 11 continues to reverse further due to inertia. In the configuration in which the inner peripheral end 65a of the main spring 65 is fixed to the reel shaft 12, the main spring 65 may be extended beyond its limit and may be broken even after the main spring 65 is fully extended. As described with reference to FIGS. 6C and 6D, when the band reel 10 is further reversed in the state where the mainspring spring 65 is fully extended, the locking claw 66 provided on the inner peripheral end 65a of the mainspring spring 65 is By disengaging the engagement protrusion 14 provided on the reel shaft 12 and reversing the band reel 10 in a state of being separated from the main spring, the main spring 65 is prevented from being damaged.

When the roller unit 20 completes the pulling back of the predetermined amount of the band B and the roller unit 20 stops the reverse rotation, the band reel main body 11 is then generated in the band B between the roller unit 20 and the band reel main body 11. When the slack band B is wound up, it cannot be reversed and the rotation is stopped.

At this time, the band B between the roller unit 20 and the band reel main body 11 receives the rotational force of the band reel main body 11 that is going to continue to rotate due to the force of the main spring 65 and the inertial force, so that the tension increases.

However, in the band reel 10 of the present invention, the braking force 50 imparts an appropriate rotation resistance to the reel shaft 12 that rotates together with the band reel body 11, thereby reducing the reversing force of the band reel body 11 to reduce the reverse rotation force of the band reel body 11. This prevents a large increase in tension in the band B when the rotation is stopped.

In particular, in the structure including the swing arm 32 biased by the biasing means 33 and the guide roller 31 attached to the swing arm 32, the tension of the band B rising when the rotation of the band reel body 11 is stopped is The swing arm 32 is swung so as to approach 31 to the roller unit 20, and is absorbed, whereby the tension increase of the band B is further suppressed.

As a result, even when the fragile object to be packed W is packed, the band B wrapped around the outer circumference of the object to be packed W by the roller unit 20 and appropriately tightened is further stopped when the reverse rotation of the band reel body 11 is stopped. It can be prevented from being damaged by being tightened.

In this way, when the pullback of the band B by the roller unit 20 is completed, the band B is cut and the band ends are welded in the seal unit 40, and the packing is completed.

In the above description, the reel shaft 12 is provided in the band reel body 11 so as to rotate together with the band reel body 11, and the mainspring spring chamber 64 is provided in the bearing box 61 of the reel support mechanism (support arm) 60. Although the configuration has been described as an example, instead of this configuration, although not shown, the reel shaft 12 cannot be rotated to the reel support mechanism 60 side like the conventional band reel described with reference to FIG. The reel shaft 12 is provided in a fixed state, and the band reel body 11 is rotatably supported by the reel shaft 12. A spring spring chamber 64 is formed in the band reel body 11, and the spring spring chamber 64 surrounds the outer circumference of the reel shaft 12. It may be configured to rotate together with the band reel body 11.

As described above, in the band reel 10 of the packing machine 1 of the present invention, the mainspring spring 65 provided on the band reel 10 can be wound in an appropriate state without excess or deficiency, and the band reel body 11 can be stopped. Along with this, it is possible to prevent the band wound around the article W to be tightened more than necessary, and even a fragile article to be packaged can be packaged with high reliability without causing damage or the like. We were able to provide a packing machine.

1 Packing Machine 7 Table 10 Band Reel 11 Band Reel Body 12 Reel Shaft 14 Engagement Protrusion 20 Roller Unit 21 Main Roller 31 Guide Roller 32 Swing Arm 32a One End (of Swing Arm)
32b other end (of swing arm)
33 Biasing means (coil spring)
40 seal unit 50 brake means 51 bolt hole 52 bolt 53 resin (resin rod)
54 spring 60 reel support mechanism (support arm)
61 Bearing Box 62 Shaft Hole 63 Bearing
64 spiral spring chamber 64a inner peripheral surface (of spiral spring chamber)
65 Spring Spring 65a Inner Edge (of Spring Spring)
66 Locking claw 100 Packing machine 102 Tightening nut 107 Table 110 Band reel 111 Band reel main body 111a Side plate 112 Reel shaft 117 Spring receiver 118 End plate 119 Friction plate 120 Roller unit 121 Main roller 140 Seal unit 165 Spring spring 200 Spring B Band W Cover Package

Claims (6)

In the band reel, which is provided in a packing machine including a band reel and a roller unit that pulls out the band reel from the band reel and sends the band back, and pulls the sent band back and winds the band around the outer circumference of the object to be packed,
A band reel body around which the band is wound, a reel support mechanism that rotatably supports the band reel body, a reel shaft that forms a rotation center of the band reel body, and a cylindrical spring spring that covers the outer periphery of the reel shaft. A chamber and a spring spring housed in the spring spring chamber,
While being housed in the mainspring spring chamber in a state of being in contact with the inner peripheral surface of the mainspring spring chamber without fixing the outer peripheral end side of the mainspring spring,
The inner peripheral end of the mainspring is configured to be engageable with the reel shaft,
A band reel of a packing machine, wherein one of the reel shaft and the spring spring chamber is fixed to the reel support mechanism, and the other is provided on the band reel body. 2. The band reel for a packing machine according to claim 1, wherein the inner peripheral surface of the main spring chamber is provided with a material having a constant friction coefficient. The band reel of the packing machine according to claim 1 or 2, further comprising: a brake unit for varying a rotational resistance applied to the band reel body. The reel shaft is fixed to the band reel body, and the braking means is urged by a spring provided at a bolt tip inserted in a bolt hole communicating in a direction orthogonal to a shaft hole into which the reel shaft is inserted. The band reel of a packing machine according to claim 3, wherein the reel shaft is pressed by a resin rod. The band reel according to claim 4, wherein the resin rod of the brake means has a constant friction coefficient. The reel shaft is provided with an engaging protrusion protruding in the outer peripheral direction,
An engaging claw formed by folding back the inner peripheral end on the inner peripheral side is provided at the inner peripheral end of the mainspring, and the engaging pawl and the engaging projection are fixed without fixing the inner peripheral end of the main spring to the reel shaft. The band reel of the packing machine according to any one of claims 1 to 5, wherein the band reel is detachably engaged with the band reel.

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