JPH08310508A - Strap-tightener of strapping packing machine - Google Patents

Abstract

PURPOSE: To provide a strap-tightening device for a strapping packing machine which is structurally compact, can be made inexpensively, enables straps to be supplied successively without being caught, rapidly, and with sureness, and contributes to speeding up strapping in handling volumes of work. CONSTITUTION: There are provided a tension arm 35 which is capable of tilting shifting on a pivot in the direction of tightening a strap or loosening it with movement of a cam, a tension-adjusting arm 37 sharing the same pivot 50 as the tension arm 35 and held tiltable jointly with as well as relative to the tension arm 35, and an electromagnetic brake 38 for the control making the tension-adjusting arm 37 capable of tilting or incapable of tilting according to a specified timing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band tightening device for a banding packing machine.

[0002]

2. Description of the Related Art For example, FIG. 6 shows a conventional banding packing machine having a band guide arch.

In this banding packing machine 1, a large number of bands wound around a band reel 2 are used to pack a band once, and the band is once housed in a pool box 3 and then the pool box 3 is packed. A predetermined amount of the band is fed from the inside to the band guide arch 6 side by the forward rotation driving force of the forward / reverse rotation roller 5 arranged in the control unit 4, while the tip of the band fed to the band guide arch 6 is pulled out. , Guide to a stopper attached below the slide table 7 and make it stand by at this position. On the other hand, when the reverse rotation driving force acts on the forward / reverse rotation roller 5, the loop-shaped band introduced into the band guide arch 6 is pulled back to the supply side, that is, the band reel 2 side by the reverse rotation driving force, and thereafter, It is forcibly tightened by the arm-shaped band tightening device 8.

FIG. 7 is an enlarged view of the vicinity of the control unit 4, and FIG. 8 is an exploded view of the band tightening device 8. The band tightening device 8 includes a tension arm 10 having a cam follower 9.
A tension jaw 11 having a substantially rectangular parallelepiped shape is swingably supported by a shaft 12 at the tip of the tension arm 10. Further, a coil spring (not shown) is interposed between the tension jaw 11 and the tension arm 10, and the tension jaw 11 is urged by the urging force of the coil spring.
Is pressed in the counterclockwise direction with the fulcrum as a fulcrum, whereby a gap serving as a passageway for the band is secured below the tip of the tension jaw 11.

Further, a tension adjusting arm 13 is arranged alongside the tension arm 10, and the tension adjusting arm 13 and the tension arm 10 are supported by the same shaft 14 so as to be tiltable. ing. Further, a tension adjuster 15 is rotatably supported on the shaft 14. On the peripheral surface of the tension adjuster 15, a substantially L-shaped locking piece 2 is provided.
6 is integrally projected.

The tension arm 10 is always pulled toward the apparatus frame 17 by the tension arm spring 16, and the tension adjustment arm 13 is always pulled in the same direction as the tension arm 10 by the tension adjustment spring 18. Has been. Reference numeral 24 is a tension adjusting dial for adjusting the tightening force.

In the band tightening device 8 configured as described above, in a normal state before tightening the band, as shown in FIG.
As described above, the tension arm 10 and the tension adjustment arm 13 are overlapped with each other to be in a substantially upright posture.

In this state, when the cam 20 is rotated by receiving the force from the speed reducer 19, the cam follower 9 moves the cam 2
Follow the movement of 0. When the cam follower 9 reaches the mountain portion of the cam 20, the tension arm 10
Tilts in the band tightening direction. That is, the shaft 14
Tilt clockwise around the fulcrum.

Then, the tension adjusting arm 13
Also tilts clockwise about the shaft 14 as a fulcrum. The tension arm 10 and the tension adjust arm 13 tilt integrally at first, but when tilted to a certain point, the pin 22 of the tension adjuster 15 rotates around the circumference of the tension adjust cam 25 that rotates together with the tension adjust dial 24. It abuts the surface, which renders the tension adjuster 15 unable to rotate. Then, since the locking piece 26 of the tension adjuster 15 locks the pin 28 of the tension adjusting arm 13, the tension adjuster 13 is locked through the locking piece 26.
Also becomes unable to tilt. Even if the tilt adjustment arm 13 stops tilting, the tension arm 10 does not stop tilting and continues to tilt clockwise as it receives the force of the cam 20.

As described above, when the tilting of the tension adjusting arm 13 is stopped and the tilting of the tensioning arm 10 is continued, the pin 2 protruding from the tensioning jaw 11 is provided.
7 comes into contact with the tension adjusting arm 13. From this state, the tension arm 10
Since the tilting jaw 11 continues to tilt away from the tension adjusting arm 13, the tension jaw 11 swings clockwise in FIGS. 7 and 8 with the shaft 12 as a fulcrum against the biasing force of the coil spring interposed in the shaft 12. To do. Then, the gap secured as the band passage is closed at the tip end of the tension jaw 11, and the band 29 traveling between the tension arm 10 and the tension jaw 11 is closed by the tension jaw 11 as shown in FIG. I will be bitten by 11.

From this state, the tension arm 10 is further
Is forcibly tilted in the direction of arrow A by the cam 20, but since the band 29 is in a state of being caught in the tension jaw 11, a tightening force of the band is generated and the band 29 is tightened.

[0012]

By the way, in the band tightening device in the above-described conventional banding packing machine, the drive control of the tension arm 10 is controlled by the machine such as the pin 22 of the tension adjuster 15 and the pin 28 of the tension adjust arm 13. Since the control is performed by engaging the parts, the number of parts is large, the structure is complicated, and as a result, the cost is increased. Further, in the conventional tightening device, the tension jaws 11 hold the band even after the tightening of the band is completed. Therefore, when the band is not released from the tension jaw when the next band is supplied, However, there was a problem that it could not be sent to the band guide arch side promptly.

In view of the above situation, the present invention has a compact structure, a small number of parts, and can be constructed at low cost.
Consequently, a band tightening device for a banding packing machine that can quickly and reliably feed the next band without hooking the band and can speed up when carrying out a large amount of banding. It is an object.

[0014]

A band tightening device in a banding packing machine according to the present invention for achieving the above object is arranged between a band pulling back means and a band reel, and a band pulling back means pulls back a band. A band tightening device that operates after being performed, the tension arm being pivotally supported so as to be tiltable in the band tightening direction or the band loosening direction following the movement of the cam, and the same shaft as the shaft that supports the tension arm. A tension adjust arm that is tiltably supported by the shaft and is disposed integrally with the tension arm or is capable of relative tilt, and an electromagnetic brake that controls the tension adjust arm to a tiltable state or a non-tiltable state at a predetermined timing. It is characterized by having and.

[0015]

According to the present invention having the above-described structure, the movement of the tension adjusting arm for biting the band or tightening the band is controlled by driving the electromagnetic brake, so that these are mechanically controlled. The structure is more compact than the case. Also, since the electromagnetic brake is used, the timing and operating time of the brake can be easily adjusted.
The band can be released immediately after tightening the band.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 is a front view showing a band tightening device in a banding packing machine according to an embodiment of the present invention, and FIG. 2 is a rear view of the band tightening device.

In the band tightening device 30 of this banding packing machine, the force from the speed reducer 31 is transmitted to the cam 33 via the shaft of the cam mechanism 32 for controlling the timing, and the cam 33 includes the cam follower 34. Is transmitted to the tension arm 35.

On the upper part of the cam mechanism 32, that is, on the slide table side, a bandway 50 on which the band travels is arranged, and in the middle of the bandway 50, a forward / reverse roller 51 consisting of a pair of rollers is arranged. Forward / reverse roller 5
1 is to supply the band in the pool box (not shown) to the band guide arch side by a positive rotational force, and to pull it back from the band guide arch to the pool box side by the reverse rotational force. Means are configured.

The band tightening device 30 is for further tightening the band pulled back by the band pulling means to strengthen the tightening of the band. The band tightening device 30 includes a tension arm 35 having a cam follower 34 and a tension arm 35.
The tension adjusting arm 37 and the electromagnetic brake 38 that controls the tilting movement of the tension adjusting arm 37 are disposed on the side (the rear side in FIG. 1) of the tension adjusting arm 37, and the tension arm 35 and the tension adjusting arm 37 are the same. Is rotatably supported by a shaft 50, and tilts integrally with the shaft 50 as a fulcrum.

The tip end of the tension arm 35 is bifurcated (see FIG. 7), and a band running path m is formed on the bottom surface of the center of the bifurcated portion. Also, the tension arm 3
A tension jaw 40 having a claw at its tip is swingably supported by a shaft 39 at the upper end of the shaft 5. Further, the tension jaw 40 is provided with a pin 41 protruding therefrom.

A coil spring (not shown) is interposed on the shaft 39 which supports the tension jaw 40, and the tension jaw 4 is urged by the urging force of the spring.
0 is always urged to rotate in the direction of arrow a in FIGS.

The tension adjusting arm 37 is formed in a substantially flat plate shape, and a U groove is formed at the tip thereof, and this groove is engaged with the pin 41 of the tension jaw 40 described above. The base end of the tension adjusting arm 37 is rotatably supported by the shaft 50.

An L-shaped fixing member 42 is integrally fixed to the tension arm 35. A jaw adjuster 44, which is formed in a substantially V-shape, is swingably supported on one pin 43 that fixes the fixing member 42. The jaw adjuster 44 is for forcibly swinging the tension jaw 40 in the band releasing direction after tightening the band, and a U groove is formed at the tip end thereof, and the shaft 41 of the tension jaw 40 is engaged with the U groove. It has been stopped.

A spring 45 is interposed between the jaw adjuster 44 and the L-shaped fixing member 42 in a compressed state. A tension arm spring 48 is interposed between the shaft 43 that fixes the fixing member 42 and the device frame 47.

Further, on the side of the tension arm 35, a stop base 49 having a bolt for restricting the moving range of the tension arm 35 is arranged. The band tightening device 30 according to the present embodiment is configured as described above, and its operation will be described below.

The band is now supplied in the band guide arch. When the start switch is turned ON, the forward / reverse rotation roller 51 starts reverse rotation, the band in the arch is pulled back to the band reel side, and the band is wound around the package. At this time, in the band tightening device 30, the tension jaw 40 is in a state of being separated from the band traveling path m as shown in FIGS. 1 and 2 by the urging force of a coil spring (not shown). A band (not shown) is inserted on the band running path m.

When the reverse rotation operation of the forward / reverse rotation roller 51 is performed for a predetermined time and completed, a motor (not shown) starts driving,
As a result, the force from the speed reducer 31 is transmitted to the cam shaft of the cam mechanism 32, and the cam 33 rotates. The cam follower 34 is guided along the shape of the cam 33. When the cam follower 34 reaches the position of the mountain of the cam 33,
The tension arm 35 starts tilting in the direction of arrow B in FIGS. After a while after tilting,
The electromagnetic brake 38 starts to operate. The tension arm 35 and the tension adjust arm 37 were initially tilted integrally, but when the electromagnetic brake 38 starts operating, the tilt adjustment arm 37 is temporarily stopped. On the other hand, the tension arm 35 continues to tilt in the B direction because the force from the cam 33 is still received even when the electromagnetic brake 38 starts to operate.

In this way, the tension adjusting arm 3
When the tilting of No. 7 stops and the tilting arm 35 continues to tilt in the B direction, as a result, the tensioning arm 35
Will tilt relative to the tension adjust arm 37. Thereby, the tension jaw 40
Pin 41 is pushed by the tension adjusting arm 37. That is, the tension jaws 40 are
It rotates about the fulcrum in the direction opposite to the arrow a direction, that is, in the arrow c direction in FIG. Then, as shown in FIG. 3, the band is caught between the tension jaw 40 and the band running path m.

When the band is engaged, the tension arm 35 and the tension adjusting arm 37 are integrated by the pin 41 of the tension jaw 40, and the tension adjusting arm 37 which has been stopped until now is forcibly forced. It will tilt in the B direction. Therefore, the band wound around the package is firmly tightened. When tightening the band like this,
The tension force of the tension arm spring 48 begins to act on the tension arm 35.

As described above, when the tension arm 35 and the tension adjusting arm 37 are tilted to sufficiently tighten the band, the cam follower 34 shifts from the peak position of the cam 33 to a slightly lower position. Then, the tension arm 35 slightly tilts in the direction opposite to the B direction, that is, in the direction to return to the original posture. At this time, since the force of the electromagnetic brake 38 is still acting on the tension adjusting arm 37, the tension adjusting arm 37 does not tilt. Therefore, the tension adjusting arm 37 pushes the tension jaw 40 via the pin 41. Then, the tension jaw 40 moves from the state of FIG.
The tension jaw 40 again.
Becomes the posture shown in FIG. Therefore, the tension jaw 40 is separated from the band running path m. As a result, a gap is formed in the upper part of the band running path m, so that the band that has been bitten by the claw of the tension jaw 40 until now is released from the tension jaw 40. However, even if the band is not released here and is still bitten by the tension jaw 40, the state in which the tension jaw 40 releases the band after the bite of the band is released as described below. It will return to the predetermined position.

That is, even if the band is still engaged, the tension arm 35 tilts again in the B direction from the state of FIG. 4 due to the preset shape of the cam 33. Then, this time, the V-shaped jaw adjuster 44
The short side of the abuts against the bolt of the stopper 49 as shown in FIG. When the jaw adjuster 44 comes into contact with the stopper 49, the long side of the jaw adjuster 44 forcibly rotates the tension jaw 40 in the direction of arrow a from the state of FIG. 3 to the posture of FIG. As a result, the band is forcibly released from the tension jaw 40.

In this way, even if the biting of the band is not released, the band is reliably released by rotating the jaw adjuster 40 thereafter.

When the tightening of the band is completed in this way, the band is cut and welded by the command signal from the controller while the band tightening device 30 is tilted.
Then, the electromagnetic brake 38 ends its operation. At the same time when the electromagnetic brake 38 finishes operating, the forward / reverse roller 51
Rotates in the positive direction, and the tension arm 35 returns to the original substantially upright posture. When the forward / reverse rotation roller 51 is normally rotated, the band is guided through the band guide arch to a stopper provided below the slide table, stays in this position, and is placed in a standby state so that the next band can be hung. To be done.

The tension arm 35 causes the band shooter 5 to move by the urging force of the tension arm spring 48.
In order to avoid collision with the shooter 50 when it is pulled back to the 0 side, the electromagnetic brake 38 may be operated immediately before reaching the origin position, and then the tension arm 35 may be gently returned to the original position. Thereby, the collision between the tension arm 35 and the band shooter 50 can be prevented.

By performing the above steps, the tightening of the band is completed, and when the start switch is pressed again, the next band hanging is performed. Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

For example, although the jaw adjuster 44 is interposed in the above embodiment, this jaw adjuster 4 is used.
4 is not essential. Further, the timing of applying the electromagnetic brake 38 is not limited to the embodiment.

The effects of this embodiment will be described below. In this embodiment, by using the electromagnetic brake 38, the band can be released from the tension jaw 40 after the band is tightened. Conventionally, the tension jaws 40 hold the band until the next forward rotation is performed. Therefore, if the band is caught too strongly, the band may not be supplied to the band guide arch side.
However, according to the present embodiment, the band can be released by releasing the electromagnetic brake when the band is tightened, and the next band hooking can be performed smoothly.

[0038]

As described above, in the band tightening device for the band hanging packing machine according to the present invention, the structure for tightening the band is compact and the number of parts is small, so that the cost is low. Further, when the next banding is continuously performed, the band is quickly supplied to the side of the band guide arch, so that the speed at which a large number of packages are continuously packed is increased.

[Brief description of drawings]

FIG. 1 is a front view of a band tightening device according to an embodiment of the present invention.

FIG. 2 is a front view of the main part of FIG. 1 viewed from the back side.

FIG. 3 is a front view of an essential part showing the operation of the band tightening device and showing a state in which the band is tightened.

FIG. 4 is a front view showing the operation of the band tightening device, showing a state in which the band is tightened and then released.

FIG. 5 is a front view showing a state in which the band is forcibly released.

FIG. 6 is a perspective view showing a conventional general banding packing machine.

FIG. 7 is a perspective view showing the control unit of FIG.

FIG. 8 is an exploded perspective view of a conventional band tightening device.

FIG. 9 is a schematic view showing the operation of a conventional band tightening device.

[Explanation of symbols]

 2 band reel 30 band tightening device 33 cam 34 cam follower 35 tension arm 37 tension adjustment arm 38 electromagnetic brake 50 axis 51 forward / reverse roller (band pulling back means)

Claims (1)

[Claims] 1. A band tightening device which is arranged between a band retracting means and a band reel and which operates after the band is retracted by the band retracting means, the band tightening direction or the band tightening direction following the movement of a cam. A tension arm that is tiltably supported in a band loosening direction, and a tension that is tiltably supported by the same shaft as the shaft that supports the tension arm and that is arranged integrally with or relative to the tension arm. A band tightening device in a banding packing machine, comprising: an adjust arm; and an electromagnetic brake that controls the tension adjust arm to a tiltable state or an untiltable state at a predetermined timing.