JP2502265B2 - Band amount correction method in band pull box in packing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band amount correcting method for always adjusting the band pool amount in a band pool in an automatic packing machine to an appropriate amount.

[0002]

2. Description of the Related Art In an automatic packing machine, a thermoplastic band drawn from a reel is fed into an arch standing on a table, and a start switch is turned on so that the tip of the band moves to the first position.
After the band is pulled back after being clamped by the clamp, the object to be packed is wound around the band separated from the arch, and the end of the band and the middle of the band are clamped by the second clamp to prevent loosening. After the welding is completed, the band is sent into the arch after the welding is completed, and the structure is prepared for the next packing.

In the automatic packing machine as described above, in order to improve the efficiency of packing work, a band pool box is provided between the reel for supplying the band and the cutting and welding mechanism, and the box of a proper length is always provided in the box. The bands are pooled, and the band in the pool box is pulled out during the process of feeding the bands into the arch to reduce the load on the feeding mechanism and improve the band feeding speed.

Ideally, the length of the band to be pooled in this pool box is approximately equal to the length of the band fed into the arch. This is because, if the pool length of the band is shorter than the loading length into the arch, it becomes necessary to replenish the reel from the reel during the delivery, making it difficult to shorten the band delivery process.

Further, if the pool length of the band is extremely longer than the loading length into the arch, the band is too slack in the pool box, and bending, bending or entanglement occurs,
A situation occurs in which it becomes impossible to send out the band.

Therefore, conventionally, a band feeding / retracting mechanism is installed on the band exit side toward the arch of the pool box, and a band retracting mechanism is installed on the band retracting side for retracting the band from the reel into the pool box. The band feed-back mechanism detects the band use length from the difference between the band feed length to the arch and the band pull-back length to the pool box, and the band pull-in mechanism determines the band use length. A method is adopted in which bands of equal length are pulled out from the reel and drawn into the pool box, so that the length of the band pool is always set so as to be sent into the arch.

[0007]

By the way, since the band feeding / pulling-back mechanism and the band drawing mechanism have a structure in which the band is sandwiched between a pair of rollers and the band is fed, slip easily occurs between the rollers and the band. Due to this, an error occurs in the band pull-in length with respect to the band use length, and the pool length of the band greatly fluctuates during repeated packing work, which causes a problem in the packing work.

In order to solve the above problems, the object of the present invention is to lengthen the length of band feeding from the pool box to the arch, length of pulling the band back into the pool box, and pulling the band from the reel to the pool box. Along with measuring the length, the amount of band pool in the pool box is detected, and the band pull-in length from the reel to the pool box is automatically increased or decreased according to the amount of band in the pool box due to this detected amount, An object of the present invention is to provide a method for correcting the amount of bands in a band pool box in a packing machine, in which a band of a proper length is always pooled in a pool box and the packing work can be performed continuously without any trouble.

[0009]

In order to solve the above problems, the present invention installs a pool box for storing a band in the middle of band movement between a band reel of a packing machine and a cutting and welding mechanism of the band. At the position on the band exit side of this pool box, while sending and pulling back the band, a band sending and pulling back mechanism that detects the band used length from the band sending out length and the pulling back length,
At the position on the band entry side of the pool box, while sending the band drawn from the reel into the pool box, a band retracting mechanism for detecting the sending length, and inside the pool box, of the amount of band pool in the pool box. A sensor mechanism for detecting increase / decrease is provided respectively, and the band feeding length into the pool box by the band pulling mechanism is based on the band feeding length in the band feeding / pulling back mechanism, and the sensor mechanism in the pool box is designed to When detecting, the sum with the pullback length should be shorter than this standard, and when the sensor mechanism does not detect the band, the sum with the pullback length should be longer than this standard. It adopts a control structure.

[0010]

[Function] When the start switch is turned on while the band that has been pooled in the pool box has been sent to the entire length of the arch by the band sending and pulling back mechanism, the band tip is first clamped, then the band is pulled back, and the band that is separated from the arch is to be packed. Tighten and pull back the excess band and store it in the pool box.

The band feeding / pulling-back mechanism detects the length of feeding the band into the arch and the length of pulling back into the pool box, and the difference between the two lengths is the band use length.

Next, the tip of the band and the clamp in the middle, the cutting in the middle of the band, and the welding of both ends of the band by heating and pressing are automatically performed.

After the pulling back of the band is completed, the band pulling mechanism operates, and the band pulled out from the reel is pulled into the pool box on the basis of the feeding length, and the length corresponding to the used length is replenished.

At this time, the detection length of the band pool is detected by the sensor mechanism provided in the pool box, and the pull-in length is automatically changed corresponding to the change of the pool state.

That is, when there is a large amount of bands in the pool box and the sensor mechanism detects this, the band is pulled in so that the sum of the band length and the pullback length becomes shorter than the reference, and conversely, the band in the pool box is pulled. When the amount is small and the sensor mechanism is not operating, it is replenished by pulling it in such that the sum of the pullback length is longer than the reference.

As described above, the band replenishing length for each packing operation in the pool box is increased or decreased according to the band amount in the pool box, so that the band length amount in the pool box can be properly maintained and the band pool Prevent the occurrence of inconvenience due to excess or deficiency.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the basic structure of an automatic packing machine, in which an arch 2 whose lower part is separated is erected on a table 1 on which an object to be packed is placed, and in the table 1, a separated part under the arch 2 is separated. A cutting and welding mechanism 3 for the band X, and a band tightening and feeding mechanism 4 for feeding and tightening the band X on the arch 2 are installed immediately below.

The cutting and welding mechanism 3 is provided with a first clamp 5, a pressurizer 6 and a second clamp 7 arranged side by side by a cam mechanism 8 so as to move up and down. The first clamp 5 and a slide plate 9 serve as a band for tightening. Clamp the tip side of X and
The clamp 7 clamps the tip of the band after winding the object to be packed and the middle thereof with the slide plate 9 to prevent the band X from loosening.

The pressurizer 6 pushes up the band X when moving upward, cuts the middle of the band X by a cutting part provided between the band C and the first clamp 5, and sandwiches the heater that has entered between the upper and lower bands. Even after the heater is pulled out, the band is further pressed to bond the melted portion of the band.

The tightening and feeding mechanism 4 comprises a driving roll 10 of a motor and a driven roll 11 which is pressed against the driving roll 10, and holds the band X and feeds it into the arch 2.
During the tightening process, the belt is reversed and the outer periphery of the object to be packed is wound with the band separated from the arch 2.

A pool box 13 for pooling the band X is installed in the middle of band movement between the tightening and feeding mechanism 4 and the reel 12 on which the band X is wound.
The position of the upper part of the box 13 facing the tightening and feeding mechanism 4 is the band output side, and the band is fed and pulled back to this position, and the band used length is detected from the band feeding length and pulling length. A band feeding / pulling back mechanism 14 is provided.

The side of the pool box 13 facing the reel 12 is the band entry side, and the band X drawn from the reel 12 is fed into the pool box 13 at the entry side, and the feeding length is detected. A band retracting mechanism 15 is provided.

The band feeding / pulling back mechanism 14 comprises
A drive roll 16 rotated by a motor, a driven roll 17 sandwiching the band X with the roll 16, and a pulse ring 18 mounted on the driven roll 17 are positioned on the outer periphery of the driven roll 17, and the rotation and rotation of the driven roll 17 feeds and pulls back the band X. It is composed of a sensor 19 for detecting the length.

The band pulling mechanism 15 also pulls in the band X by rotating the drive roll 20 rotated by the motor, the driven roll 21 sandwiching the band X with the roll 20, and the pulse ring 22 attached to the driven roll 21. The sensor 23 for detecting the length.

Therefore, the band X drawn from the reel 12 is moved by the band drawing mechanism 15 to the pool box 13.
The band X in the pool box 13 supplied to the inside of the pool box 13 is sent out to the arch 2 and pulled back by the sending / pulling-back mechanism 14, and the band length of the sending and pulling back and the supply to the pool box 13 is made. Will be electrically detected.

Inside the pool box 13, a sensor mechanism 2 for detecting an increase / decrease in the amount of band pool in the box 13 is provided at a position close to the delivery / pullback mechanism 14.
4 are provided. The sensor mechanism 24 is composed of a combination of a swing metal plate 25 suspended in the pool box 13 and a proximity switch 26, and when the band X has a small pool amount and the metal plate 25 is not pushed, the sensor mechanism 24 is connected to the proximity switch 26. When the metal plate 25 is pushed toward the switch 26 side by the band X due to the large pool amount of the band X, the switch 26 detects the metal plate 25 and operates. become.

The present invention has the above-mentioned delivery / pullback mechanism 1
4, the pull-in mechanism 15 and the sensor mechanism 24 are used to control the pull-in mechanism 15 so that the amount of band pool in the pool box 13 is always an appropriate amount.

In the feeding / pulling-back mechanism 14, the length is detected by the pulse amount generated by the rotation of the driven roller 17 at the time of band feeding / pulling back. The total length A is set, the pulse amount generated by the band pullback amount is set as the pullback length B, and the value obtained by subtracting the pullback length B from the total length A is the band usage amount C,
The band replenishment amount into the pool box 13 by the retracting mechanism 15 may be set to a length amount corresponding to the band usage amount C, but an error occurs in the actual band feeding due to a slit between the band and the roll or the like. , Retraction mechanism 15
If the band replenishment amount is set to simply match the band usage amount C, the amount of band pool in the pool box 13 becomes excessive and short, which hinders the packing work.

Therefore, the setting of the band feeding length into the pool box 13 by the control of the band drawing mechanism 15 uses the sensor mechanism 24 in the pool box 13,
As shown in the upper half of FIG. 2, the band pull-in length amount when the sensor mechanism 24 is detecting the band X is based on the total length A, and the sum of the pullback length B and the band pull-in length amount is the total length. Band retracting mechanism 15 so that it is shorter than A
To control.

On the contrary, when the sensor mechanism 24 does not detect the band X, the band pull-in length amount is based on the full length A and the pullback length B as shown in the lower half of FIG. The band pull-in mechanism 15 is controlled so that the sum of the band pull-in length amount becomes longer than the total length A.

The above control of the band pull-in mechanism 15 is such that the band pull-in length amount is preset when the sensor mechanism 24 is operating with respect to the theoretical pulse amount that matches the band usage amount C. When the sensor mechanism 24 is inactive, the control mechanism 2 controls so that the band withdrawal amount is increased by the set pulse amount.
The band pull-in mechanism 15 is electrically controlled via 7.

Next, the correction method of the present invention will be described.

When the packing machine is operated while a proper amount of the band X is pooled in the pool box 13, the entire length of the arch 2 is filled with the band X via the band feeding / pulling-back mechanism 14, and the inside of the pool box 13 is filled. The full length A of the band X pulled out from is detected, and then, in the band tightening process, the band delivery / pullback mechanism 14 is reversely rotated, and the hand pullback length B returned to the pool box 13 is detected. It is input to the control mechanism 27.

Then, in response to a command from the control mechanism 27, the band retracting mechanism 15 is operated to retract the band X drawn from the reel 12 into the pool box 13 to replenish it. At this time, the sensor mechanism 24 is operated. So that the sum with the pullback length B is a little shorter than the total length A,
When the sensor mechanism 24 is inoperative, the band pull-in mechanism 15 is controlled by detecting the pull-in pulse amount so that the sum with the pull-back length B becomes slightly longer than the total length A.

As described above, in replenishing the band after pulling the band back into the pool box 13 for each package, the sensor mechanism 24 detects the band amount in the pool box 13 so that it is used when the band amount in the pool box 13 is large. If the amount of the band is small, and if the amount of the band is small, the amount of the band X for each package in the pool box 13 is constantly in a fixed range by supplementing the amount of the band pool more than the amount used. It is possible to solve the problems caused by excess and deficiency.

[0037]

As described above, according to the present invention, the amount of band pool for each package in the band pool box of the packing machine can be kept within a certain range, which causes a problem due to excess or deficiency of the band pool amount. It will not occur and the band can be sent to the packing machine without any problem.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the basic structure of a packing machine.

FIG. 2 is an explanatory diagram of band replenishment for a band pool box.

[Explanation of symbols]

 2 arch 12 reel 13 pool box 14 sending and pulling back mechanism 15 band pulling mechanism 24 sensor mechanism

Claims (1)

(57) [Claims] 1. A pool box for storing the band is installed during movement of the band between the band reel of the packing machine and the cutting and welding mechanism of the band, and the band is sent out and pulled back to a position on the band exit side of the pool box. At the same time, the band feed / pull back mechanism that detects the band usage length from the band feed length and pull back length, and the band pulled out from the reel into the pool box at the band entry side of the pool box. A band retracting mechanism that detects the length and a sensor mechanism that detects an increase or decrease in the amount of band pool in the pool box are provided inside the pool box, and the band feeding length into the pool box by the band retracting mechanism. Is based on the band delivery length of the band delivery / retraction mechanism. , When the sensor mechanism in the pool box detects the band, the sum of the pullback length should be shorter than this standard, and when the sensor mechanism does not detect the band, the pullback length A method for correcting the amount of bands in a band pool box in a packing machine, wherein the sum is controlled to be longer than this standard.