JPH0891306A - Method and device for feeding web in bag-making/filling/ packaging machine - Google Patents

Abstract

PURPOSE: To provide a device for feeding a web which does not require a braking device, and can feed a band-form film at a specified speed. CONSTITUTION: A fourth driving motor 40 is linked to a web film 15, and a band-shaped film 16 is fed out by rotating the film 15 in a specified direction an guided to a bag-making device 18. By this method, the web film 15 rotates following the rotating speed of the driving motor 40, and does not keep rotating by an inertial force, and therefore, a braking device is not required, and the rotating speed of the film 15 and the feeding out speed of the band-shaped film 16 as well can be controlled. Then, said control is performed by a control signal which is transmitted to the fourth driving motor 40 from a speed control device 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for feeding a raw material in a bag making and packaging machine.

[0002]

2. Description of the Related Art Conventionally, in a bag-making filling and packaging machine such as a horizontal pillow packaging machine, for example, as shown in FIG. 3, a raw film 1 wound into a roll is drawn out as a continuous strip-shaped film 2 to form a bag. It is supplied to the container 3, where it is formed into a tubular shape to form a tubular film 4. On the other hand, a package supply device 5 is installed on the carry-in side of the bag making device 3, conveys the package 6 at predetermined intervals, and sequentially supplies it into the tubular film 4. Then, the article to be packaged 6 is sequentially conveyed while being contained in the tubular film 4, the film seal end of the tubular film 4 is sealed by the center sealer 7 during the transportation, and further the end sealer 8 is used. Each package 6 of the tubular film 4 is laterally sealed and cut to manufacture the package 9.

When the strip-shaped film 2 is fed from the original film 1, the feed roller 1 is provided with a pair of rollers for sandwiching the pulled-out strip-shaped film 2 from both sides thereof.
0 is used. That is, the feed roller 10
One of the rollers 10a constituting the above is connected to the drive motor 11, and the other roller 10b is set in a free state. As a result, when the drive motor 11 rotates at a constant speed, one roller 1
Since 0a also rotates at a constant speed, the strip film 2 is pulled out at a constant speed. Following this, the original film 1 is also indirectly given a rotational force, allowing the withdrawal of the strip film.

For the drive control of the above-mentioned respective parts, for example, the system shown in Japanese Patent Laid-Open No. 63-281911 is used.
That is, the other two drive systems (the drive system of the package feeding device 5 and the drive system of the end sealer 8) are controlled with the drive motor 11 for pulling out the strip film 2 as a reference. More specifically, the reference band-shaped film 2 is pulled out at a constant speed as described above, and the interval between the cut marks formed on the band-shaped film 2 is detected to be different from the predetermined interval (cut mark pitch). In this case, the speed of the package supply device 5 (conveyance speed of the package), the rotation speed of the end sealer 8 and the meshing timing are increased / decreased so that the motors that are the drive sources of all drive systems are synchronized. There is. In this way, the moving speed of the strip-shaped film 2 serves as a reference for drive control of the entire packaging device, so that if the moving speed fluctuates, it cannot operate normally. Therefore, it is necessary to pull out the strip film at a constant speed as described above.

By the way, when the strip-shaped film 2 is sandwiched and pulled out by the feed roller 10 as described above, the original film 1 rotates following the pull-out of the strip-shaped film 2, so that a constant inertial force is applied. Is occurring. If there is a difference between the rotation speed due to the inertial force and the drawing speed of the original film 2, the band-shaped film 2 may be loosened. When the band-shaped film is loosened in this way, the band-shaped film 2 meanders when passing through the bag-manufacturing device 3 of the packaging apparatus to form a bag, for example, and the center seal portion is not formed at a desired position. ,
As a result, the final package may be defective.

Therefore, the original film 1 is provided with a braking device for braking this rotation, and the rotation of the original film 1 is braked so that tension is applied to the strip film 2 to prevent the occurrence of the slack. I have to.

[0007]

However, if the braking force of the above-mentioned braking device is too strong, the strip-shaped film 2 will slip at the portion of the feed roller 10 and the predetermined amount cannot be pulled out per unit time. On the other hand, if the braking force is weak, the effect of the braking cannot be fully exerted, and slackness or the like will occur. In this way, adjustment of the braking force requires high accuracy,
It becomes complicated. Moreover, since the inertial force becomes smaller as the winding diameter of the original film becomes smaller, if the braking force is made constant, the braking force and the inertial force cannot be balanced except for a certain period of time, and the above problem occurs.

Further, in order to apply a uniform tension to the strip film 2 from the beginning to the end of the original film 1, it is necessary to perform control so that the braking force becomes smaller as the winding diameter becomes smaller. Large and complicated. Then, it becomes difficult to control the balance between the two accurately.

Further, the above braking device is installed around the original film 1, and the original film 1 and the bag making device 3 are provided.
The feed roller 10 and the drive motor 11 for driving the feed roller 10 must be installed between the feed roller 10 and the feed roller 10, and the installation position of the original film 1 is high, and as a result, the entire packaging device is high, which is a neck of miniaturization. Becomes

The present invention has been made in view of the above background, and an object of the present invention is to solve the above problems and to reduce the size of an entire packaging apparatus mounted without a large-scale braking device. In addition, it is possible to pull out at a predetermined speed while applying a constant tension (tension) from the original fabric film to the strip film regardless of the increase or decrease in the winding diameter of the original fabric film, and to perform such control. An object of the present invention is to provide a method and an apparatus for feeding a raw material in a bag-making filling and packaging machine that can easily carry out the above.

[0011]

In order to achieve the above-mentioned object, the method of delivering a raw fabric in a bag-making filling and packaging machine according to the present invention uses a strip-shaped film continuously fed from a raw fabric film. A method of delivering the strip-shaped film from the raw film in a bag-making filling and packaging machine for wrapping an article to be packaged conveyed at predetermined intervals and sealing and / or cutting a predetermined portion of the film to manufacture a package. In addition, by applying a rotational force of a drive motor capable of controlling acceleration and deceleration to the original film, the original film is rotated in a predetermined direction to continuously form the belt-shaped film into the bag-making filling and packaging machine. The rotation speed of the original film is changed by increasing or decreasing the rotation speed of the drive motor so that the rotation speed of the belt-shaped film is increased. It was Gosuru way.

Further, in the original fabric feeding device according to the present invention suitable for carrying out the above-mentioned method, the article to be packaged which is conveyed at a predetermined interval by using the strip-shaped film continuously fed from the original fabric film. A film-feeding and packaging machine for wrapping and sealing and / or cutting a predetermined part of the film to produce a package, which is a device for feeding the film to be mounted on the rotating body. A drive motor capable of controlling acceleration and deceleration for applying a rotational force, a speed control device for controlling the speed of the drive motor so as to set a delivery speed of a belt-shaped film delivered by rotation of the original film to a predetermined speed, And a means for supplying the band-shaped film delivered to the bag-making filling and packaging machine side.

[0013]

When the drive motor is operated, the rotational force is transmitted to the original film and the original film rotates at a predetermined speed. The strip-shaped film wound around the unprocessed original film is delivered at a predetermined speed. Then, the feeding speed of the strip-shaped film is controlled so as to follow it by accelerating and decelerating the drive motor. Therefore, the control device increases the rotation speed of the drive motor as the winding diameter of the original film becomes smaller, so that the belt-shaped film is fed at a constant speed. Further, since the rotation of the original film follows the rotation of the drive motor in this way, when the drive motor is decelerated or stopped, the rotation of the original film is also decelerated / stopped according to the change, Since it does not continue to rotate due to inertial force, the conventional braking device becomes unnecessary. Then, the band-shaped film delivered as described above is supplied to a predetermined position of the bag-making filling and packaging machine by a supply unit at a predetermined speed and used as a packaging film.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method and apparatus for feeding a raw fabric in a bag-making filling and packaging machine according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an embodiment of an original fabric feeding device and a bag-making filling and packaging machine (pillow packaging device) according to the present invention.

As shown in the figure, the strip-shaped film 16 wound around the original film 15 is wound around a plurality of pulleys (fixed pulley, tension pulley, etc.) 17 and guided to a bag making machine 18 below. By passing through the bag making device 18, a tubular film 19 is formed by being tubularly formed.

On the carrying-in side (upstream side) of the bag-making device 18, the object to be packaged 20 is placed in the bag-making device 18, that is, in the tubular film 19.
An article-supplying device 22 for sequentially supplying the items is installed. The package supply device 22 is configured by attaching pushing fingers 26 to the endless chain 25 provided between a pair of drive sprocket 23 and driven sprocket 24 at regular intervals, and is linked to the drive sprocket 23. Further, it receives rotational force from the first drive motor 27 and is rotationally driven. And this first
The drive motor 27 is composed of a motor such as a servo motor which can freely control acceleration and deceleration.

An auxiliary roller 28, a center sealer 29, and an end sealer 30 are arranged at predetermined positions on the unloading side (downstream side) of the bag making machine 18, and a unloading conveyor 32 is installed further downstream of the end sealer 30. Has been done.

The auxiliary roller 28 is a tubular film 19
Is composed of a pair of rollers for sandwiching the overlapping end portions of the strip-shaped film 16 from both sides thereof, and has a speed slightly higher than the moving speed of the strip-shaped film 16 delivered by the material delivery device according to the present invention described later with respect to the tubular film 19. A transporting force is applied to the strip-shaped film 16 so that the strip-shaped film 16 is prevented from being loosened.

The center sealer 29 is composed of a pair of flat rotating rollers (at least one of which is heated). The rotating ends of the cylindrical film 19 are sandwiched by both rotating rollers and heated to heat the overlapping ends. It is designed to be heat-sealed. The rotation speed of the center sealer 29 is also slightly higher than the moving speed of the strip film 16.

The auxiliary roller 28 and the center sealer 29 are connected to a second drive motor 33 so that they rotate synchronously at the same speed. The second drive motor 33 is connected to the speed control device 38 together with the first drive motor 27, and the speed thereof is controlled. The second drive motor 33 may also be configured by a motor such as a servo motor capable of increasing or decreasing speed in order to have versatility, but when it is not necessary to change the rotation speed during the operation of the packaging device, You may comprise with a normal motor.

Further, in the end sealer 30, top sealers 30b are attached to rotating shafts 30a which are vertically opposed to each other, and both rotate in synchronism with each other so that the top sealers 30b form the tubular film 19 for each rotation. It is designed to be caught and struck. Further, a heater and / or a cutter are built in the predetermined top sealer 30b. As a result, when the top sealers 30b come into contact with each other, a predetermined portion of the tubular film 19 is heated and fused, and is cut by a cutter to manufacture the package 34. Then, the package 34 is carried out by the carry-out conveyor 32. In addition, this end sealer 30
Is also rotatably driven by a third drive motor 35 associated with one rotation shaft 30a.
The drive motor 35 is also composed of a motor such as a servo motor capable of controlling acceleration and deceleration.

Here, in the present invention, a fourth drive motor 40 is linked to the original film 15 to directly apply a rotational force in a predetermined direction to the original film 15 to produce a strip film 16.
Is transmitted at a predetermined speed. That is, as shown in FIG. 2, since the raw film 15 is configured by winding the strip film 16 around the paper tube 41 many times, the paper tube 41 is cantilevered by the bearing 42. Inserted and fixed to the rotating shaft 43, which is a rotating body,
Integrated with. The original film 15 has a rotating shaft 43.
It is clamped and fixed from both sides by a stopper 44 provided on the.

Further, a sprocket 45 is fixed to one end of the rotary shaft 43, and the rotational force of a fourth drive motor 40 (not shown) is applied to the rotary shaft 43 via a power transmission chain 46 hung on the sprocket 45. I am trying to reach you. As a result, when the fourth drive motor 40 rotates, the rotation shaft 43 and thus the original film 15 rotate. Then, the fourth drive motor 40 is rotationally driven based on the control signal from the speed control device 38 described above.

The fourth drive motor 40 and the rotary shaft 43
Does not have to be connected via the power transmission chain as described above, but the output shaft of the drive motor may be directly connected to the rotary shaft or connected via a gear or the like.

With the above construction, when the fourth drive motor 40 is rotated, the rotary shaft 43 and thus the original film 15 are rotated at a predetermined speed as described above, so that the strip-shaped film 16 continues. Sent out.
Since the fourth drive motor 40 and the original film 15 are interlocked with each other, when the fourth drive motor 40 accelerates and decelerates, the rotation speed of the original film 15 also accelerates and decelerates.

Therefore, it is rotationally driven at a certain speed (high speed rotation).
Even if the fourth drive motor 40 is suddenly stopped or decelerated during the operation, the original film 15 does not continue to rotate at a high speed due to inertial force as in the conventional case, and the original film 15 is stopped or stopped as it is. Since the vehicle is decelerated, a large braking device as in the past is not necessary. Further, by accurately controlling the rotation speed of the fourth drive motor 40, the rotation speed of the original film 15 can be controlled, and the fourth drive motor 40 relating to the feeding speed of the strip film 16 can be controlled. It can be adjusted by In addition, the strip-shaped film 16 sent out in this manner is used for the second drive motor 3
By the pulling force from the auxiliary roller 28 and the center sealer 29 which are rotationally driven by 3, the sheet is supplied to the packaging machine side at a predetermined speed.

By the way, with the above structure, the original film 1
Although the belt-shaped film 16 is continuously fed by directly applying a rotational force to the film 5, the winding diameter of the raw film 15 is gradually reduced with this feeding. Therefore, temporarily
When the rotation speed of the drive motor 40 is constant, the delivery speed of the strip film 16 gradually decreases, and the movement speed of the strip film 16 which is a reference for drive control of each part of the horizontal pillow packaging device is not constant. Therefore, in order to feed the strip-shaped film 16 to the bag-making device 18 (packaging device) at a constant speed, it is necessary to increase the rotation speed as the winding diameter of the raw film 15 becomes smaller. Therefore, the speed control device 38 controls to gradually increase the rotation speed.

As a specific control, when the strip-shaped film is moved and supplied at a predetermined speed, the pipe diameter gradually decreases at a constant rate (the strip-shaped film is fed at a constant speed on the packaging machine side). The pipe diameter is calculated according to the elapsed time from the start of the work), and a speed map and table are created in accordance with the elapsed time from the start of the work in accordance with the degree of decrease. In addition, it is possible to perform control such that the speed of the fourth drive motor is increased with reference to such a map.

If the feeding speed of the belt-shaped film due to the rotation of the original film 15 and the feeding speed of the belt-shaped film due to the pulling out of the auxiliary roller 28 are equal, the second and fourth drive motors 33 and 40 are operated. The load is not so heavy, and the desired rotation speed can be obtained simply by supplying a predetermined current, but if the speed of both changes, one drive motor (the one with the slower rotation speed) will Since a load / braking force is applied, it is necessary to supply a current higher than the normal supply current in order to rotate the other drive motor at a predetermined speed. On the other hand, on the other hand, when one drive motor side supplies a predetermined current, the other drive motor applies a rotational force, so that the drive motor rotates at a speed equal to or higher than the normally obtained rotation speed. Therefore, the change of the current (deviation from the target value (normal value)) and the change of the rotation speed (deviation from the target value (normal value)) are monitored, and these values are 0 (the above-mentioned withdrawal speed and delivery speed). Equal) or
It is also possible to perform feedback control for each drive motor so that the drive motor has a predetermined value (the pulling speed and the sending speed have a certain difference). However, when the moving speed of the belt-shaped film 16 is constant, it is preferable to control the second drive motor 33 to rotate at a constant speed, and when the belt-shaped film 16 is controlled to be accelerated or decelerated at a predetermined timing. Also in this case, it is preferable to control the fourth drive motor 40 based on the rotation speed of the second drive motor 33.

The speed control for the above-mentioned first and third drive motors is also performed by this speed control device 38, but since such control is conventionally well known, a specific processing flow will be omitted.

Next, based on the above-mentioned embodiment, one embodiment of the original fabric feeding method according to the present invention will be explained while explaining its operation. First, predetermined variable data such as the cut size of the film, the height and length of the packaged object, the number of products manufactured per unit time, etc. are input to the speed control device 38. And
The moving speed (target value) of the strip film 16 is obtained from the cut size and the number of products manufactured per unit time.

The input of each of the above data is necessary for controlling the drive of the entire pillow packaging device. For the method of feeding the raw film, at least the cut size of the film and the production per unit time are required. All you need is the number. Alternatively, the moving speed (target value) of the strip film 16 may be directly input without inputting such data.

From the above moving speed (target value), the rotational speeds of the auxiliary roller 28 and the center sealer 29, that is,
The rotation speed of the second drive motor 33 for driving it is obtained. Then, when the position alignment (initial setting) of each part is completed, the second drive motor 33 is driven to rotate at a constant speed at the rotation speed obtained above. In addition, the strip film 16
Is conveyed at a moving speed (target value), the first and third drive motors 27 and 35 are also driven to accelerate and decelerate at a predetermined timing. Further, the fourth drive motor 40 is rotated at a predetermined speed (initial value) (set to a speed slightly slower than the moving speed). As a result, the strip-shaped film that has been pulled out does not loosen up to the bag making device 18.

When the fourth drive motor 40 is rotationally driven, the original film 15 is also rotated at a predetermined speed, and the belt-shaped film 16 is fed from the original film 15. At the same time, the second drive motor 33 rotates at a constant speed and the auxiliary roller 28 and the like associated therewith also rotate at a constant speed, so that the belt-shaped film 16 sent out passes through the bag-making machine 18 at a constant speed to form a cylinder. The product 20 to be packed is supplied to the inside while being formed into a bag-like film 19, and by further advancing as it is, the center sealer 29 seals the film polymerization end portion, and the end sealer 30 seals and cuts in the lateral direction for packaging. The body 34 is manufactured.

Then, the feeding speed of the strip film 16 is controlled so as to follow it by accelerating and decelerating the fourth drive motor 40. Therefore, the speed control device 38 increases the rotational speed of the fourth drive motor 40 in response to the decrease in the winding diameter of the raw film 15 to thereby feed the strip film 16 at a constant speed. Moreover, since the speed control is constantly performed in real time, the rotation speed of the fourth drive motor 40 can be changed smoothly (without a step), so that the moving speed of the strip film 16 is close to the target value. A constant value is maintained at.

Further, in this embodiment, a large equipment such as a braking device is not required, and the raw film 15 is used to form the bag making machine 1.
Since there is only a non-bulky member such as the pulley 17 up to 8, the bulk of the mounted packaging device can be reduced and downsizing can be achieved.

In the above embodiment, the first and third drive motors 27 and 35 are respectively accelerated and decelerated at a predetermined timing, but the present invention is not limited to this, and the first drive motor is not limited to this. The motor 27 may rotate at a constant speed. That is, in the embodiment, when the object to be packaged 20 is supplied to the packaging machine 18, the object to be packaged 20 is moved at the same speed as the tubular film 19 which is in contact with the object to be packaged. In the case where it does not collapse due to the contact resistance due to the speed difference, the control is performed by rotating the first drive motor 27 at a constant speed as described above to make the conveying speed of the article supply device 22 constant. The system can be simplified.

In the above-described embodiment, the bag-filling / packaging machine to be mounted is applied to the horizontal pillow packaging device in the above-described embodiments, but the vertical pillow packaging device, the horizontal three-way packaging device, the four-way packaging device, etc. It can be applied to various bag-making filling and packaging machines as long as the packaging film used can be continuously drawn from the original film.

[0039]

As described above, in the method and apparatus for feeding the raw fabric in the bag-making filling and packaging machine according to the present invention, a drive motor is connected to the raw fabric film, and the raw fabric film is loaded by the rotational force of the drive motor. Since the film is rotated, it is possible to control the feeding of the strip-shaped film on the side of the original film. That is, when the drive motor is accelerated or decelerated, the rotation speed of the original film is also accelerated or decelerated accordingly, and when the drive motor is stopped, the rotation of the original film is also stopped. Therefore, unlike the conventional case, the original film does not continue to rotate due to inertial force, and a large-scale braking device for the original film is unnecessary.

Then, when the rotation of the drive motor is gradually increased at a predetermined ratio in accordance with the decrease in the tube diameter of the original film accompanying the feeding of the band-shaped film, the band-shaped film is fed at a constant speed. You can

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an original fabric feeding device in a bag-making filling and packaging machine according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing the vicinity of a raw film which is a main part of this embodiment.

FIG. 3 is a diagram showing a conventional technique.

[Explanation of symbols]

 15 original film 16 strip film 28 auxiliary roller (supply means) 29 center sealer (supply means) 33 second drive motor (supply means) 38 speed control device 40 fourth drive motor (drive motor)

Claims (2)

[Claims] 1. A wrapping body is formed by wrapping an article to be packaged conveyed at a predetermined interval using a strip-shaped film continuously fed from an original film and sealing and / or cutting a predetermined portion of the film. A method of delivering the strip-shaped film from the raw film in a bag-making filling and packaging machine to be manufactured, by applying a rotational force of a drive motor capable of controlling acceleration / deceleration to the raw film, thereby forming the raw film. The belt-shaped film is rotated in a predetermined direction so as to be continuously delivered to the bag-making filling and packaging machine side, and the rotation speed of the original film is changed by increasing or decreasing the rotation speed of the drive motor. A method for feeding a raw material in a bag-making filling and packaging machine, in which the feeding speed of the band-shaped film is controlled. 2. A wrapping body is formed by wrapping an article to be packaged conveyed at a predetermined interval using a strip-shaped film continuously fed from an original film and sealing and / or cutting a predetermined portion of the film. A device for feeding a raw film provided in a bag-making filling and packaging machine to be manufactured, wherein a drive motor capable of controlling acceleration and deceleration for applying a rotational force to a rotating body on which the raw film is mounted, A speed control device that controls the speed of the drive motor so that the delivery speed of the belt-shaped film delivered by rotation becomes a predetermined speed, and a means for supplying the delivered belt-shaped film to the bag-making filling and packaging machine side. The original fabric feeding device in the provided bag making filling and packaging machine.