JP2006290380A - Band tightening method in strapping and packing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band tightening method in a strapping and packing machine capable of immediately performing an adequate strapping at a low cost when various kinds of articles are present in a mixed manner. <P>SOLUTION: In the band tightening method in the strapping and packing machine, after a band tip is fed outside the packing machine body by the rotating and driving force of an AC motor, a band is returned back by the rotating and driving force of the motor, and the band is tightened after returning the band. The band tightening after returning the band is set in a changeable manner via a switch so as to select any one of the two methods, i.e., a torque method of adjusting the tightening force applied to the band, and a stroke method of adjusting the tightening length of the band. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a band tightening method in an automatic banding packing machine.

  In an automatic or semi-automatic banding and packing machine, after the band pulled out from the band reel is placed around the object to be packed, the band tip is gripped with a press member, and then the band is pulled back to the band supply side. Subsequently, by tightening the band, an appropriate tightening force is applied to the packed object (Patent Document 1).

  Such band pull-back is composed of two steps if it is subdivided, that is, a band pull-back step of winding lightly around the object to be packed and then pulling and tightening strongly.

By the way, the optimum tightening degree of the band differs depending on the size, type, etc. of the object to be packed. For example, a large tightening amount is required for a large packaged item, and a small amount of tightening is sufficient for a small packaged item. Furthermore, when tightening something like a futon, the tightening amount increases, but the tightening force may be weak.
In such a banding packing machine, the band tightening amount or tightening strength is set by adjusting an adjustment dial or the like provided in the packing machine.

There are two methods of tightening the band, a so-called stroke method and torque method.
The stroke method applies the rated voltage to the motor from the beginning, and uses the band tightening amount corresponding to the set time by the timer as a reference for control. After the set time is completed, the band is tightened. The motor is stopped.

On the other hand, the torque method enables setting of the force acting on the band when the band is tightened by the control of the powder clutch or the motor by the inverter. Whether or not the band is tightened to a predetermined force, for example, a notch is provided in a part of the member that rotates together with the tension roller, and the passage of the notch is detected by a detection means such as a photosensor, Thereby, the presence or absence of rotation of the tension roller is detected. Therefore, if the rotation stops, it can be confirmed that a predetermined force has acted on the band. If the passage of the notch becomes irregular, it is considered that the tension roller is slipping. In this case, it can be determined that the tension roller has been tightened to a predetermined force.
Japanese Patent No. 3604552

  By the way, when performing banding, inaccurate banding may be performed depending on the package depending on whether the band is tightened by a stroke method or a torque method.

For example, the stroke method tends to cause a tightening failure when packing a packaged object such as a soft packaged object or a foamed polystyrene having a poor surface slip.
On the other hand, since the torque method tightens up to a preset torque value, there is a problem that the time required for one cycle of packing depends on the individual state of the packed object and is not stable. In addition, there is a problem that the cost of the powder clutch and the inverter is high.

  Furthermore, various articles may be mixed in an actual banding. In such a case, it is difficult to find the optimum condition even if the dial adjustment is performed to optimize the band tightening.

  In view of such a situation, the present invention can perform appropriate banding suitable for the packaged item when various articles are mixed, and can implement this at low cost. An object of the present invention is to provide a band tightening method in a banding packing machine that can be used.

In order to achieve the above object, the band tightening method in the band hanging packing machine according to the present invention is:
In the band tightening method in the band hanging packing machine, after the band is supplied to the outside of the packing machine body by the rotational driving force of the motor, the band is pulled back by the rotational driving force of the motor, and the band is tightened after the band is pulled back.
One of the two methods, a torque method for adjusting the tightening force acting on the band and a stroke method for adjusting the band tightening length, can be selected as the band tightening performed after the band is retracted. Thus, it is characterized in that it can be switched via a switch.

Here, it is preferable that the motor is an AC motor and the torque of the torque system is adjusted by controlling the phase of the AC motor.
According to the banding and packing machine having such a configuration, it is possible to perform banding according to the packing state of the packaged item. Moreover, since it is only necessary to control the phase, it can be set at low cost.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a part of a banding packing machine provided with a band tightening method according to an embodiment of the present invention, and particularly shows a part related to band supply, band pulling back and tightening.

  In this banding packing machine, a feed roller 20 that feeds the band in the direction of the arrow upward in the figure and a feed touch roller 21 that forms a pair with the feed roller 20 are disposed so as to be press-contacted and separated via an eccentric shaft 24. ing. Further, a tension roller 51 for tightening the band and a rod 56 of a solenoid 55 and an arm 57 attached to the rod 56 can be pressed against and separated from the feed roller 20 on the downstream side in the band feeding direction. The tension touch roller 54 is configured as a band tightening means. Further, the reverse rotation roller 10 and the reverse rotation touch roller 13 for pulling back the band are disposed on the downstream side in the band feeding direction as viewed from the tension roller 51 so as to be able to press and separate. In addition, an AC motor is employed as the power of the banding packing machine of this embodiment.

In the banding machine of this embodiment, the band is supplied in the direction of the arrow by the rotational driving force of the feed roller 20, and the band in the direction opposite to the arrow is pulled back by the rotational driving force of the reverse rotation roller 10. . Further, after the retraction by the reverse rotation roller 10, the band is tightened as a secondary retraction of the band by the rotational driving force of the tension roller 51. When the band is supplied by the feed roller 20 and the feed touch roller 21 or when the band is tightened by the tension roller 51 and the tension touch roller 54, a set of touch rollers not related to the band feeding. Is configured to be separated from the corresponding driving roller.
On the other hand, in the banding packing machine of the present embodiment, both the tightening of the band by the torque method and the tightening of the band by the stroke method are combined. That is, when the band is tightened by the torque method, first, the band tip is supplied in the direction of the arrow by the feed roller 20, and when the band tip reaches a predetermined position, the band tip is gripped by a pressing means (not shown). Thereafter, the rotation of the feed roller 20 is stopped, and this time, the band is pulled back to the reverse rotation touch roller 13 by the rotational driving force of the reverse rotation roller 10. Subsequently to the pulling back of the band, this time, the band is tightened with the tension touch roller 54 by the rotational driving force of the large-diameter tension roller 51. And it tightens until a predetermined torque acts on a band.

  On the other hand, in the banding packing machine according to the present embodiment, when the band is tightened by the stroke method, the band is tightened by the rotational driving force of the tension roller 54 after the band is pulled back by the reverse rotation roller 10. In that case, the band length for the set time by the timer is tightened.

  Furthermore, in this embodiment, when tightening the band by the torque method, the torque is adjusted by simply controlling the phase of the AC current of the AC motor, rather than adopting an expensive member such as a powder clutch or an inverter. It is configured to.

  That is, in the present embodiment, when it is desired to tighten it weakly, the conduction time for each cycle is shortened by controlling the phase, thereby reducing the amount of AC power and reducing the torque.

Also, in this embodiment, a changeover switch on a control panel or the like not shown in the figure can be selected so that either the torque method based on such phase control or the band tightening with the conventional stroke method can be selected. The band tightening method is selected by switching this switch.
Therefore, according to the band tightening method of the banding packing machine according to the present embodiment, even if it is a work site where various items to be packed flow in the transport line, switch to an appropriate tightening method. The band can be tightened.

Further, in this embodiment, the band tightening by the torque method can be realized with an inexpensive structure because an expensive member such as a powder clutch is not necessary.
Further, when the band is tightened by the stroke method, the motor is driven by applying the rated voltage as before, and the tightening amount (stroke) is controlled by a timer.

  According to the banding packing machine having such a configuration, it is possible to set tightening conditions corresponding to various items to be packed.

FIG. 1 is a cross-sectional view showing a main part of a banding packing machine according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reverse roller 13 Reverse touch roller 20 Feed roller 21 Feed touch roller 51 Tension roller 54 Tension touch roller

Claims (2)

In the band tightening method in the band hanging packing machine, after the band is supplied to the outside of the packing machine body by the rotational driving force of the motor, the band is pulled back by the rotational driving force of the motor, and the band is tightened after the band is pulled back.
Select one of the two methods: a torque method that adjusts the tightening force acting on the band and a stroke method that adjusts the length of the band that tightens the band after the band is pulled back. A band tightening method in a band hanging packing machine characterized in that it is set to be switchable via a switch so that it can be performed. The band tightening method for a banding packing machine according to claim 1, wherein the motor is an AC motor, and the torque of the torque system is adjusted by controlling the phase of the AC motor.

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