JPH04339708A - Bag making-filling-packaging device - Google Patents

Abstract

PURPOSE:To correct snaking of a web due to slip at a let-out section and a large let-out resistance, at a let-out position. CONSTITUTION:Driving shafts 1a, 1a at both let-out parts 1, 1 are respectively connected to output ends 2a, 2a of a differential gear mechanism 2, and an input end 2c of the differential gear mechanism 2 is connected to a driving source 3. When one let-out part 1 slips, and the frictional resistance decreases, or when the tension on one side of a web W becomes smaller than the tension on the opposite side, and the revolutions of one driving shaft 1a increases, the revolutions of the other driving shaft 1a is reduced as many as the increased revolutions by the operation of the differential gear mechanism 2, to reduce the let-out quantity on the side of the web W where slip did not take place, or on the side with a larger tension. Then, when the slipping stops, or the difference in the tension at both side parts W1, W1 of the web W is eliminated, both driving shafts 1a, 1a rotate at the same speed, and both side parts W1, W1 of the web W is evently let out.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a pair of feeding parts on opposite sides of the outer periphery of a tube molded body, each of which is in contact with both sides of the web, and is fed from a roll by intermittent operation of both feeding parts. The present invention relates to a bag-forming-filling-packaging device that wraps a web around a tube-shaped body and allows it to hang down while forming a tube-shaped body, and fills an object to be packaged into the tube-shaped web.

0002

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-open No. 62-158630, this type of bag-forming-filling-packaging device has been known to have a drive shaft for both feeding portions disposed on both sides of the outer periphery of a tube formed body. It is connected to a motor via a clutch and a brake, and by driving the motor to intermittently operate both feeding parts, both sides of the web wound around the tube molded body are fed out downward in parallel, and as a result, the web is drawn out from the roller. In some webs, the web is pulled out and wound around a tube molded body, and the both side edges of the web are overlapped and welded by vertical seals to form a tube shape.

0003

[Problems to be Solved by the Invention] However, in such a bag making, filling and packaging apparatus, since both the feeding sections rotate at the same speed and the same amount, the surface of the feeding section may become dirty, and both sides of the web in the width direction may become dirty. If the unwinding resistance is different and one of the unwinding sections slips against the web, the other unwinding section will forcibly pull and unwind the web on one side, causing the web to tilt in the width direction, causing the web to forcibly pull out. The unrolling resistance on one side of the unrolled web increases,
The feeding portion on the opposite side that comes into contact with this tends to slip, and as a result of this being repeated, there is a problem in that the web meanderes and defective products occur.

[0004] In order to reduce the occurrence of defective products, it is necessary to stop the operation and readjust the web every time the web starts meandering, which is time-consuming and reduces the operating rate.

[0005] In addition to the above-mentioned slippage at the feeding section, web meandering is caused by factors such as the difference in the left and right winding diameters of the rolls, the web There are many problems such as non-uniform thickness, web slack and flapping, and it is impossible to completely eliminate these causes of meandering.

[0006] In view of the conventional circumstances, the present invention aims to correct slips in the feeding section and meandering of the web due to large feeding resistance at the feeding position, and to correct the meandering of the web that occurs while being fed from the roll to the feeding section. Another purpose is to correct meandering at the feeding position.

[0007]

[Means for Solving the Problems] The technical means taken by the present invention to solve the above problems is to link the drive shafts of both feeding parts to the output ends of the differential gear mechanism, respectively,
This differential gear mechanism is characterized in that its input end is linked to a drive source.

[0008] A detection unit for detecting a positional shift in the width direction perpendicular to the web feeding direction is provided on the upstream side of both feeding units in the web feeding direction, and a brake is provided for rotationally decelerating the drive shaft of each feeding unit. It is preferable to provide a controller so as to be able to freely move toward and away from the brake, and also to cause a brake located on the displaced side to engage based on a detection signal output from the detector.

[0009]

[Operation] According to the above-mentioned technical means, the present invention provides that one of the feeding portions slips and its frictional resistance decreases, or the tension on one side of the web becomes smaller than the tension on the other side, causing one of the drive shafts to slip. As the number of rotations increases, the number of rotations of the other drive shaft is reduced by the amount that the number of rotations has increased due to the operation of the differential gear mechanism, and the amount of feed on the non-slip side of the web or the side with high tension is reduced. After that, if there is no slippage or there is no difference in tension between the two sides of the web, both drive shafts rotate at the same speed and both sides of the web are unwound equally.

[0010] Then, the web is supplied to the feeding section with an inclination in the width direction, and the detecting section detects the positional deviation and engages the brake of the side that has deviated, thereby rotating the drive shaft of the side that has deviated. is decelerated, and the rotation of the drive shaft on the opposite side is accelerated by the amount of deceleration, so that the web is fed out more than the one in which the web was misaligned, and the web is forcibly moved in the opposite direction to the direction in which it was misaligned, and then detected. When the web is no longer detected, the brake is released and both ends of the web are unrolled equally.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIGS. 1 and 2, a feeding belt is provided as a feeding section 1 on both sides of the outer periphery of a tube formed body A, and a web W wound around the tube formed body A is used.
Output shafts 2a, 2a, which are the output ends of the differential gear mechanism 2, are disposed in contact with both sides W1, W1 in the width direction of The base ends of the drive shafts 1a, 1a and the intermediate portions of the output shafts 2a, 2a are linked by bevel gears 1b, 1b, and both widthwise side edges W2, W2 of the web W are supported in a straight line. are made to protrude from the tube molded body A and overlapped, and the overlapped part W3 is formed into a vertical seal part B.
It is sandwiched and heat sealed.

The differential gear mechanism 2 consists of main drive gears 2b, 2b fixed close to opposing ends of output shafts 2a, 2a arranged in a straight line, and a mechanism that rotates around these main drive gears 2b, 2b. An input ring 2c, which is an input end freely arranged and linked to the drive source 3, and the main power bevel gear 2a, which is pivotally attached to the inner circumference of the input ring 2c.
This is a differential gear device of a conventionally well-known structure consisting of driven bevel gears 2d and 2d that mesh with the driven bevel gears 2a and 2a in an opposing manner.
is transmitted to the main bevel gears 2b, 2b, and both output movements 2a
, 2a. And these two output shafts 2a, 2
If approximately the same rotational resistance is applied to a, both output shafts 2a
, 2a are the same, the driven bevel gears 2d, 2d do not rotate, and when the rotational resistance of one output shaft 2a becomes smaller and the rotational speed increases, the driven bevel gears 2d, 2d move in opposite directions. , and the other output shaft 2a rotates by the increased amount.
Reduce the rotation speed.

In this embodiment, the drive source 3 is, for example, a servo motor or the like, and the drive source 3 and the input ring 2c are linked by a timing belt 3a.

Further, on the upstream side of both of the feeding belts 1, 1 in the direction in which the web W is fed out, there is provided a detection section 4 for detecting a positional shift in the width direction perpendicular to the feeding direction of the web W.

In the case of this embodiment, the detection section 4 is a reflection type phototube, and this reflection type phototube is placed directly under the sailor A1 disposed at the upper end of the tube molded body A as shown in FIGS. 2 and 3.
A pair of plates A2 are arranged to face the opposite side edges W2, W2 of the web W wound around the tube molded body A and protrude in parallel, and are formed of a material that is difficult to reflect between these side edges W2, W2. As one side edge W2 protrudes as the web W shifts in the width direction, the reflective phototube 4 facing the side edge W2 detects the side edge W2 and sends a detection signal to the control unit 5.
Output to.

The control section 5 is electrically connected to the detection sections 4, 4 and a pair of brakes 6, 6 to be described later, and by continuously inputting a detection signal from one of the detectors 4 for a set time or longer. , an actuation signal is output to the brake 6 disposed on the same side as the web side edge W2 whose overhang is detected.

[0017] The brakes 6, 6 are connected to both feeding belts 1,
The drive shafts 1a and 1a of 1 are rotated and decelerated separately,
In the case of this embodiment, the pressure surfaces 6b, 6b provided at the tips of the air cylinders 6a, 6a are provided so as to be movable toward and away from the output shafts 2a, 2a of the differential gear mechanism 2, respectively, and By inputting an actuation signal to one of the air cylinders 6a, the air cylinder 6a is extended and the pressing surface 6b is brought into pressure contact with the output shaft 6b, and at the same time when the input of this actuation signal is stopped, the air cylinder 6a is expanded. Compression is performed to move the pressing surface 6b away from the output shaft 6b.

Next, the operation of the bag making, filling and packaging apparatus will be explained. First, while the web W is being pulled out from the roll to the tube formed body A without tilting in the width direction by the intermittent operation of both the feeding belts 1, 1, the surfaces of the feeding belts 1, 1 and both sides W1 of the web W are , W1, and when there is no slippage due to dirt, and there is no tension difference between the web side parts W1 and W1, and the respective feeding resistances are approximately the same, the rotation of the drive source 3 is controlled by the rotation of the differential gear mechanism 2. The input ring 2c, the driven helical gears 2d, 2d, and the main helical gears 2b, 2b are sequentially passed through to both the feeding belts 1,
The two drive shafts 1a, 1a are rotated at the same speed, and both sides W1, W1 of the web W are fed out downward by the same amount.

During the feeding of the web W, if a slip occurs between one feeding belt 1 and one side W1 of the web due to foreign matter such as dirt, the friction of the feeding belt 1 on the slipping side As the resistance decreases, the rotational speed of the drive shaft 1a increases, and as a result, one output shaft 2a and the main moving gear 2b that are linked to the drive shaft 1a.
The number of revolutions will also increase.

As a result, the actuating bevel gears 2d, 2d rotate in opposite directions, and the number of rotations of the main bevel gear 2b that slips increases by the amount that the main bevel gear 2b that does not slip and the output shaft 2a rotate. The rotation speed of the drive shaft 1a of the non-slip feed-out belt 1 is also reduced, and the feed amount is reduced.

Therefore, even if one of the feeding belts 1 slips and the friction torque decreases, the other feeding belt 1 does not forcefully pull the web W, thereby preventing the web W from meandering.

After that, when the slip disappears, the rotational speed of the drive shaft 1a of the feeding belt 1 that was slipping decreases, and the rotational speed of the drive shaft 1a that did not slip increases by the amount of this decrease. The feeding amounts of both feeding belts 1, 1 return to the same amount.

Furthermore, if a difference in tension occurs between both sides W1, W1 of the web W while the web W is being fed out, and the respective feeding resistances change, the one side of the web where the tension is low and the feeding resistance is low in the relaxed state. The rotation speed of the drive shaft 1a of the feed-out belt 1 that comes into contact with the part W1 increases, and the rotation speed of the drive shaft 1a of the feed-out belt 1 that comes into contact with the other side W1 of the web where the tension is high and the feeding resistance is large is decreased. , the amount of payout of one side of the web W1 that is slack increases, and the amount of payout of the other side W1 of the web that is taut decreases by the increased amount.

As a result, the difference in tension between the two sides W1, W1 of the web W disappears, and as a result, the tension between the two feeding belts 1, 1
The amount of extension will also return to the same amount.

On the other hand, when the web W is pulled out from the roll to the tube formed body A with an inclination in the width direction, one side edge W2 of the web that protrudes in the width direction is detected by one of the detecting portions opposite thereto. 4 detects and outputs a detection signal to the control unit 5, the brake 6 on the same side moves in contact with the output shaft 2a, and the drive shaft 1a of the feeding belt 1 that comes into contact with the one side W1 of the web that has moved toward the overhang side Rotation slows down.

[0026] As a result, the amount of payout of the overhanging side decreases, and at the same time, the amount of payout of the retracted side located on the opposite side increases, so that the web W moves to the retracted side, and one side edge of the overhanging web increases. W2 gradually withdraws,
Along with this, the other side edge W2 of the retracted web gradually protrudes, and finally the protruding amounts of these both side edges W2, W2 match, the detection signal output from the detection section 4 disappears, and the brake 6 is activated by the output shaft 2a. Move further away.

In the above-mentioned embodiment, a feeding belt is used as the feeding section 1, but the feeding belt is not limited to this, and other means such as a feeding roller may be used. The structure, the structure of the detection unit 4, the brake 6, etc. are not limited to those described above, and other structures may be used.

Further, although both edges W2, W2 of the web W were made to protrude from the tube formed body A and were overlapped and heat-sealed, the present invention is not limited thereto. They may be overlapped and heat sealed.

In this case, as shown in FIG. 4, a material that is difficult to reflect is placed between the inner side edge W2 wrapped along the tube molded body A and the side edge W2 wrapped around the outer side. The detection unit 4 is disposed opposite the outer side edge W2, and the position of the outer side edge W2 shifted in the left-right direction due to the positional shift in the width direction of the web W is detected. When detected by the detection section 4, a detection signal is output to the control section 5, which causes the control section 5 to output an actuation signal to one of the brakes 6, 6.

[0030]

[Effects of the Invention] Since the present invention has the above structure, it has the following advantages. 1. If one feeding section slips and its frictional resistance decreases, or the tension on one side of the web becomes smaller than the tension on the other side, the rotational speed of the drive shaft increases, and the differential gear mechanism operates to reduce this rotation. As the number increases, the rotation speed of the other drive shaft is reduced to reduce the amount of feed on the non-slip side of the web or the side with high tension, and then the slip disappears or the difference in tension on both sides of the web decreases. Once this occurs, both drive shafts rotate at the same speed and both sides of the web are fed out equally, so that slippage in the feeding section and meandering of the web due to large feeding resistance can be corrected at the feeding position.

[0031] Therefore, compared to the conventional system in which both feeding parts rotate at the same speed and the same amount, there are no defective products, there is no need to stop operation to adjust the meandering of the web, and the effort of adjustment work can be saved. At the same time, the operating rate improves.

2. The web is fed to the feeding section with an inclination in the width direction, and the detection section detects the misalignment and applies the brake of the misaligned side, thereby decelerating the rotation of the misaligned drive shaft. The rotation of the drive shaft on the opposite side is accelerated by the amount of deceleration, and the web is fed out more than the one that is misaligned, and the web is forcibly moved in the opposite direction to the misaligned direction, after which the detection unit no longer detects it. For example, by releasing the brake, both ends of the web are unrolled equally, so that meandering of the web that occurs while being fed from the roll to the unwinding section can be corrected at the unwinding position.

[0033] Therefore, no defective products are produced even if many causes of meandering that exist upstream of the feeding section are not removed, there is no need to stop the operation to adjust the meandering of the web, and the trouble of adjustment work is reduced. This saves money and improves the operating rate.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view of a bag-forming-filling-packaging device showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of the same.

FIG. 3 is a partially enlarged sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a partially enlarged cross-sectional view showing a modified example of the arrangement of the detection section.

[Explanation of symbols]

A Tube molded body
W web W1 side part
W2 side edge 1 Feeding part (feeding belt)
1a Drive shaft 2 Differential gear mechanism
2a Output end (output shaft) 2c Input end (input ring)
3 Drive source 4 Detection section
5 Control part 6 Brake

Claims (2)

[Claims] Claim 1: A pair of feed-out portions are provided on opposite sides of the outer periphery of the tube formed body, each in contact with both sides of the web, and the intermittent operation of these feed-out portions causes the web fed from the rolls to flow into the tube formed body. In a bag making, filling and packaging apparatus that wraps the web and hangs it down while forming it into a tube shape, and fills the article to be packaged into this tubular web, the drive shafts of both the feeding parts are respectively linked to the output side of the differential gear mechanism. A bag making, filling and packaging apparatus characterized in that the input side of the differential gear mechanism is linked to a drive source. 2. A detection unit is provided on the upstream side of both the feeding units in the web feeding direction to detect a positional deviation in the width direction perpendicular to the web feeding direction, and a brake is provided for rotationally decelerating the drive shaft of each feeding unit. Based on the detection signal output from the detection section,
2. The bag making, filling and packaging apparatus according to claim 1, further comprising a control section for actuating a brake located on the side where the position has shifted.