JP2008013225A - Packaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging apparatus holding a packaged article between two film sheets fed out of two film rolls, and heat-welding the sheets at the front, rear, left, and right to package the packaged article, which prevents shift of welded front ends and formation of a wrinkle or welding folded sheets. <P>SOLUTION: The packaging apparatus includes a transfer belt, a detection sensor for sensing the front/rear ends of a packaged article, and a control means of a conventional apparatus, and further includes a film driving means capable of causing at least one film roll to feed a film at a speed lower than that of the transfer belt. Before the start of packaging, a slack is given to the film to reduce resistance caused by the forced insertion of the article, and the film driving means is driven when the packaged article held between films is transferred by the transfer belt. The film driving means is kept driving until the moment at which the slack reduces to zero so as to alleviate tensile force impact, and is stopped following that moment. After completion of heat-welding at the rear end of the article, the film is given a slack again for the next packaging. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a film to be wrapped such as a newspaper is sandwiched between two synthetic resin film sheets which are fed out from two film rolls and the ends are heat-welded to each other. The present invention belongs to the technical field of a packaging device that stops and heat-wraps the back end side and the both sides of two films to be packaged.

For example, a packaging device that wraps a newspaper or the like is in a state in which a newspaper is sandwiched between two films by manually pushing the newspaper between two films that are fed out of a film roll and welded at the tip. It is pushed between the conveyor belts.
When the newspaper is pushed between the two films by hand, the film is pushed forward by the newspaper and the film roll is rotated by that force to feed the film.
Thereafter, when the newspaper is pushed together with the film between the conveying belts, the film is further advanced by the conveying force of the conveying belt, and the film roll is rotated by that force to feed the film.
The film and the newspaper are temporarily stopped while being conveyed by the conveying belt, and the film around the newspaper is welded. Thereafter, the driving of the conveyor belt is resumed, whereby the newspaper is pulled and cut at the welded portion on the rear end side to complete the packaging.

A shutter is provided between the newspaper insertion slot and the welded portion to urge the two films in a direction to overlap each other, and the newspaper is inserted against this urging. Thereafter, the urging force of the shutter works in the direction of sandwiching both the newspaper and the two films, so that the two films are stably fed along the front and back surfaces of the newspaper without wrinkles or the like (for example, Patent Document 1). reference).
Japanese Patent Application No. 2006-062710 ([0023] and below, FIG. 1)

However, such a packaging apparatus has the following problems.
The conveying belt that conveys the article to be wrapped, such as a newspaper, between the two films stops in order to thermally weld the newspaper rear end side and the left and right sides of the two films.
However, since the film roll has inertia at this time, it cannot be stopped at the same time as the stop with the conveyor belt, but stops after rotating to some extent due to inertia. For this reason, the film drawn out from the film roll causes slack during the film supply process.

  Then, when the newspaper is inserted at the time of the next packaging, since the force for pushing the film with the newspaper is relatively small until the slack is eliminated, the newspaper can be pushed in easily. This is because the resistance force applied to the newspaper is only the force necessary to eliminate the sagging of the film, and not the force necessary to feed the film from the film roll.

  However, when this sagging is eliminated, the resistance to the progress of the film increases momentarily when the film is stretched. This is because the force necessary to feed the film from the roll is applied after the moment when the slackness is eliminated.

Thus, when the resistance force increases momentarily, the film is pulled, and the appearance after packaging may be deteriorated due to the following problems.
First, the leading edge of the package and the welding tip of the film are shifted.
Secondly, the film is turned up at both sides in the width direction of the article to be packaged and welded in a state where the tip is broken.
Third, the film's pulling force exceeds the shutter's urging force, and the shutter is opened during conveyance, so that stable feeding along the surface of the newspaper is not possible, and the film is welded in a wrinkled state. .
Etc.

Due to these problems, there was a problem that the appearance after packaging deteriorated.
If the slack before insertion of the newspaper is increased so that the resistance does not increase instantaneously on the way, the slack will not be eliminated during the conveyance of the newspaper, and there will be no impact, but it will be welded while being wrinkled. Later looks worse. Since the wrinkle of the film is elongated and the shape of the film is stabilized by eliminating the slack, it is necessary to eliminate the slack.

  However, if there is no slack from the beginning, if the package is thin and has no waist, it is difficult to pull out the film from the film roll because it pushes the welding tip of the film at the tip of the package and reaches the conveyor belt. At first, sagging is necessary because it becomes difficult.

  From the above, the problem to be solved by the packaging device of the present invention is that there is a slack before the start of conveyance in the middle of the film supply path, but there is no slack in the middle of the conveyance and the instantaneous resistance force at that time is as much as possible. The present invention is to provide a packaging device which is made small and generates a slack for the next packaging.

In order to solve the above-described problems, the present invention has the following means configurations.
The first configuration (basic configuration) of the present invention is transported by sandwiching an object to be packaged between two films that are respectively fed from two film rolls and whose ends are heat-welded to each other, and then placed on a transport belt. And a packaging device that stops on the way and heat-welds the rear end side and the left and right sides of the two films to be packaged,
(A) a transport driving means for transporting the transport belt;
(B) Film driving means for driving one film roll to rotate by a film driving roller so that the film is fed out at a speed slower than the conveying speed of the conveying belt;
(C) a sensor for detecting the arrival of the leading edge and the trailing edge of the packaged object sandwiched between two films;
(D) a control means for controlling the driving of the film drive means, the transport drive means and the heat welding means by a detection signal from the sensor;
The control means operates the conveyance driving means when receiving the leading edge detection signal of the object to be packaged from the sensor, and operates the film driving means at the same time or after that to reduce the slack of the film in the film supply path. After the slack disappears, the film driving means is stopped. When the trailing edge detection signal is received from the sensor, the conveyance driving means is stopped and the two films are heated on the trailing edge side of the packaging object. After the welding is completed, the transporting unit is operated again to discharge the packaged product, and the film driving unit is driven again to feed out the film so that a predetermined amount of slack is formed in the middle of the film supply path. The packaging device is controlled to be stopped.

  A second configuration of the present invention is the packaging device according to the first configuration, wherein the film driving means includes a one-way clutch that idles in a rotation direction opposite to the drive rotation direction.

  According to a third configuration of the present invention, in the first configuration or the second configuration, the film driving unit includes a rotation detection unit for detecting the rotation amount, and the control unit receives the rotation detection signal and receives the rotation detection signal. The packaging device is characterized in that when the film driving means is driven after the rear end film heat welding of the package, the rotation is controlled to stop when the rotation amount reaches a preset rotation amount.

  According to a fourth configuration of the present invention, in any one of the first to third configurations, when the driving of the film driving unit is stopped, a friction load is applied so that the film roll does not rotate due to inertia. It is a packaging apparatus characterized by comprising an inertia rotation preventing means.

  According to a fifth configuration of the present invention, in addition to any one of the first to fourth configurations, the other film roll is driven in the same manner as the one film roll. The packaging apparatus is characterized in that it has two film driving means, and the control means performs the same control as the film driving means of one film roll.

In the first configuration (basic configuration) of the present invention, the film can be fed out from the film roll by the film driving means, and after completion of one packaging operation, a predetermined amount of the film is fed out. The supply path has a certain amount of slack. That is, it is assumed that there is slack in the film at the start of packaging.
Because of this slack, when the article to be packaged is inserted through the insertion slot and pushed in, the film will be supplied from this slack portion, and the tip of the article to be packaged will advance by pushing the welding tip of the film. Therefore, even if the package is thin and weak, it is possible to push in and advance. When the front end of the article to be packaged reaches the sensor, the control means drives the conveyance driving means and the conveyance belt starts to rotate. And when the front-end | tip of a to-be-packaged object pinches and reaches a conveyance belt, it will be caught and conveyed.

  At the same time as or after the start of the rotation of the conveyor belt, the film driving means is driven to start supplying the film from the film roll. Since the film feeding speed is slower than the conveying speed of the conveying belt, the sag of the film gradually decreases and there is no sag in the middle of conveying, and thereafter the film is pulled out from the film roll by the conveying force of the conveying belt. Then, the film driving means is stopped. The moment when the slack disappears, resistance is generated, but since the film roll has already been rotated, the resistance is increased by the amount already rotated compared to when the film roll is suddenly pulled out from the film roll not rotated as before. The force is smaller than before, and the welding tip of the film is displaced from the tip of the package and turns to the side as in the past, or the film is turned up at both sides in the width direction of the package and the tip is broken If the film is welded by the film, or the film's tensile force exceeds the urging force of the shutter, the shutter will open during transportation, and stable feeding along the surface of the package will not be possible. There is an effect that the problem of being done is solved.

  The amount of sag set before inserting the packaged object needs to be supplied from the film roll so that the packaged object is pushed from the insertion port and reaches the welding tip of the film, and then further pushed to reach the conveying roller. And the amount of sag is as fast as possible until the trailing edge of the package is detected by the sensor and the conveyor belt stops because the conveyor belt conveyance speed is faster than the film supply speed of the film driving means. Set to.

  In the second configuration of the present invention, since the film driving means is provided with a one-way clutch that rotates idly in the rotation direction opposite to the driving rotation direction, the slack is eliminated and the film is driven by the transport belt. Even if the film is pulled out at a speed faster than the film supply speed, the film driving means can be pulled out smoothly without applying a rotational force due to the drawing.

  In the third configuration of the present invention, since the rotation detecting means for detecting the rotation amount of the film driving means is provided, the film driving means stopped after the slack disappears is operated again for the next packaging. When forming a sag, the control means receives the rotation detection signal, and can stop the drive when the rotation amount reaches the preset sag amount, thereby forming an accurate sag amount. effective.

  In the fourth configuration of the present invention, when the driving of the film driving means is stopped, the film roll is provided with the inertia rotation preventing means for applying a friction load so that the film roll does not rotate due to inertia. There is an effect that the amount of sagging can be made accurate.

  The fifth configuration of the present invention is provided with film driving means for both of the two film rolls, and controls the same as both of them, so that it looks better than the case where the film driving means is provided for only one film roll. There is an effect that packaging can be performed.

The film driving means used in the present invention is the best embodiment in which a film driving roller fixed to a rotating shaft rotated by a motor and rotating in the driving direction is brought into contact with the film roll.
Further, when a one-way clutch is provided, it is best to provide it between the rotating shaft and the film drive roller.
The control of the film drive means by the control means starts at the start of driving of the conveyor belt or after that, and stops driving after the film sag disappears, but after the film sag disappears, the film Since it is pulled by the conveyor belt at a speed faster than the film feeding speed by the film driving means, the driving by the film driving means is meaningless, so the driving of the film driving means should be stopped as soon as possible after the slack disappears. Is the best.

  The set amount of slack is determined by inserting the packaged object between the front-end welding films and pushing it in. When the leading edge reaches the conveyor belt, there is still slack, and the rear end of the packaged object is the sensor. It is best to set so that there is no sag at the earliest possible time before being detected.

Hereinafter, embodiments of the packaging device of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
A film roll 7 and a film roll 18 around which a band-shaped synthetic resin film is wound are disposed on the upper left and the right. The film from the film roll 7 passes through the rollers 8 and 10 and passes between the tip of the shutter 20 and the knife receiver 11 downward. The film from the film roll 18 passes through the pulley 16 and the roller 17, and similarly passes between the front end of the shutter 20 and the knife receiver 11 so as to overlap the film from the film roll 7.
In the final stage of packaging, the welding knife 21 advances to the right and is pressed against the knife receiver 11 in a state where the two films are overlapped, and the lower part is torn and transported by the transport belt 13. The upper two film tips are welded at the height position of the welding knife 21 below the tip of the shutter 20 to form a film welding end 23.

In this state, when the newspaper 6 is inserted and pushed in from the upper insertion port 5, it enters between the two films at the shutter 20, and when pushed further, the front end of the newspaper 6 enters the film welding end 23. Reach. If the film is further pushed after reaching the end of the welded film, the film on both sides will be pulled forward.
An optical sensor comprising a light emitting element 12 and a light receiving element 22 is provided below the knife receiver 11, and the arrival of the leading edge of the newspaper is detected when the leading edge of the newspaper blocks the optical path of the optical sensor. The light receiving element 22 is connected to the controller 4, and the controller 4 starts driving the conveyor belt 13 when receiving the detection signal.

  Accordingly, when the leading edge of the newspaper is pushed in until it reaches the conveyor belts 13 and 13, it is held by the two conveyor belts 13 and 13 and drawn downward to be conveyed. When it is detected that the rear end of the newspaper 6 has passed through the optical sensor, the controller 4 stops the rotation of the conveyor belts 13 and 13. Therefore, both the newspaper and the two films on both sides stop. At this time, since the rear end of the newspaper is below the optical path of the optical sensor, there are only two overlapping films at the position of the knife receiver 11.

The controller 4 stops the rotation of the conveyor belts 13 and 13 and then advances the welding knife 21 toward the knife receiver 11 to thermally weld the two films on the knife receiver.
When the conveyor belt is rotated again after the heat welding is completed, the film portion sandwiching the newspaper is pulled downward, so that it is torn off at the welding portion, and the front end of the two films at the knife receiver 11 and the rear end side of the newspaper These films are separated in a welded state, and the person sandwiching the newspaper is further thermally welded on both the left and right sides by a heat welding means (not shown) and conveyed to the discharge guide 14.

  In the above process, in the present invention, when a newspaper is inserted and pushed in through the insertion slot 5 and reaches the conveying belts 13 and 13 together with the film welding end 23, there is a slack 9 in the film from the film roll 7. It has become.

  Further, the controller 4 receives the detection signal that the front end of the newspaper has passed the optical path of the sensor, and simultaneously or later, the controller 4 drives the film driving means including the motor 3, the belt 2, and the film driving roller 1 to drive the film roll 7. It is rotated and the film is fed out. The film feeding speed is set slower than the conveying speed of the conveying belts 13 and 13 and has a speed difference.

  Therefore, the slack 9 that exists when the leading edge of the newspaper 6 reaches the conveyor belts 13 and 13 decreases when the newspaper 6 is carried by the conveyor belts 13 and 13. Here, the amount of slack 9 and the speed difference are set so that the slack 9 disappears before the trailing edge of the newspaper reaches the optical path of the sensor. After the sagging is eliminated, since the film is drawn out by the conveying force of the conveying belts 13 and 13, the feeding by the film driving means slower than the conveying speed is meaningless, so the driving by the film driving means is stopped. The time until the sag disappears is fixed and constant if the amount of sag and the speed difference are set. After the sensor detects the leading edge of the newspaper, the controller 4 drives the film. The power supply to the motor 3 of the means may be stopped.

  However, since the film is pulled out by the conveying force of the conveying belts 13 and 13, the film roll 7 rotates. Therefore, it is desirable to use a one-way clutch that is free in the direction of pulling out the film to the film driving means so that this rotation is performed smoothly.

  As described above, at the moment when the slack disappears, the film roll 7 is still rotating by the film driving means, and the film is being fed out. Compared to the case where the film is pulled suddenly at the moment when there is no sag, the resistance force (tensile force) applied to the film is small. The film is turned up at the both sides in the width direction of the newspaper and welded in a state where the tip is broken, or the film tension exceeds the urging force of the shutter 20, and the shutter opens during conveyance and the surface of the newspaper The problem that the stable feeding along the line cannot be performed and the wrinkle is generated is solved.

After that, after the newspaper is transported by the transport belts 13 and 13 and the trailing edge is detected by the sensor and heat welding is performed, the controller 4 drives the film driving means to form the slack 9 for the next packaging. A predetermined amount of film is fed out from the film roll 7.
In this embodiment, the film driving means is provided with a rotation amount detecting means and an inertia rotation preventing means in order to make the feeding amount accurate.

FIG. 2 is a diagram showing the structure of an embodiment of the rotation amount detection means and inertia rotation prevention means. (A) is the figure which looked at the axis | shaft from the top, (b) is the figure which looked at (a) from the downward direction.
First, the brake roller 25 is fixed to the drive shaft 26 of the film drive roller 1, and a bracket 33 is attached to the support plate 32, and the brace shoe 24 is fixed to the bracket 33 so as to be in contact with the outer periphery of the brake roller 25.
Thus, friction is generated between the brake roller 25 and the brake shoe 24, and the rotation of the film roll 7 due to inertia after the power of the motor 3 in FIG. 1 is turned off is suppressed.

Thereby, the rotation amount control by turning on / off the power supply to the motor 3 is more accurate than when there is no brake.
As the rotation amount detection means, a disk-shaped index plate 27 that rotates together with the drive shaft 26 is attached to the drive shaft 26. As shown in FIG. 2B, windows 31 are arranged on the index plate 27 along the circumference, and an optical sensor 28 is provided so as to be sandwiched from the outer peripheral side to the position of the window 31.

The light sensor 28 is provided with a light emitting element 29 and a light receiving element 30 so as to face each other. When the index plate 27 rotates and the window 31 comes to the position of the light sensor 28, the light passes therethrough. Receives light and outputs a light reception signal. When a part other than the window 31 comes, the light is blocked and no signal is output.
Therefore, the amount of rotation of the index plate 27 and hence the film driving roller 1 can be measured by counting the received light signals.

The light receiving element 30 is connected to the controller 4, and the controller 4 counts the number of received light signals from when the motor 3 is started, and supplies power to the motor 3 when the counted value reaches a preset value. I try to turn off.
After the power supply is cut off, rotation due to inertia is suppressed by friction of the brake shoe 24, so that the amount of sag formed by being drawn out from the film roll 7 is accurately set in advance.

Although the above Example is an example which provided the film drive means only with respect to the film roll 7 among two film rolls, it is a film drive also with respect to the film roll 18, ie, both film rolls. By providing the means, and the controller 4 performs the same control as described above for both the film driving means, the packaging can be further improved in appearance.
In the description of the embodiment, the article to be packaged has been described as the newspaper 6, but the same applies to items other than newspapers.

It is a figure which shows the structure of this invention Example. It is a figure which shows the structure of the Example of the inertia rotation prevention means and rotation detection means in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Film drive roller 2 Belt 3 Motor 4 Controller 5 Insertion slot 6 Newspaper 7 Film roll 8 Roll 9 Slack 10 Roll 11 Knife receptacle 12 Light emitting element 13 Conveying belt 14 Discharge guide 15 Slack 16 Pulley 17 Roll 18 Film roll 19 Support roller 20 Shutter 21 Welding knife 22 Light receiving element 23 Film welding end 24 Brake shoe 25 Brake roller 26 Drive shaft 27 Index plate 28 Optical sensor 29 Light emitting element 30 Light receiving element 31 Window 32 Support plate 33 Bracket

Claims (5)

Each of the two film rolls is fed out and sandwiched between two films whose ends are heat-welded to each other. A packaging device for thermally welding the rear end side and the left and right sides of the package,
(A) a transport driving means for transporting the transport belt;
(B) Film driving means for driving one film roll to rotate by a film driving roller so that the film is fed out at a speed slower than the conveying speed of the conveying belt;
(C) a sensor for detecting the arrival of the leading edge and the trailing edge of the packaged object sandwiched between two films;
(D) a control means for controlling the driving of the film drive means, the transport drive means and the heat welding means by a detection signal from the sensor;
The control means operates the conveyance driving means when receiving the leading edge detection signal of the object to be packaged from the sensor, and operates the film driving means at the same time or after that to reduce the slack of the film in the film supply path. After the slack disappears, the film driving means is stopped. When the trailing edge detection signal is received from the sensor, the conveyance driving means is stopped and the two films are heated on the trailing edge side of the packaging object. After the welding is completed, the transporting unit is operated again to discharge the packaged product, and the film driving unit is driven again to feed out the film so that a predetermined amount of slack is formed in the middle of the film supply path. A packaging device that is controlled to be stopped.   The packaging apparatus according to claim 1, wherein the film driving means includes a one-way clutch that idles in a rotation direction opposite to the driving rotation direction.   The film driving means has a rotation detecting means for detecting the rotation amount, and the control means receives the rotation detection signal, and the rotation amount is set in advance when the film driving means is driven after film rear end side film heat welding of the package. The packaging device according to claim 1 or 2, wherein the control is performed so that the drive is stopped when the set amount of rotation is reached.   The inertial rotation preventing means for applying a friction load so that the film roll does not rotate due to inertia when the driving of the film driving means is stopped is provided. Packaging equipment. In addition to the configuration of the invention of any one of claims 1 to 4, the second film roll has a second film drive means for performing the same drive as that for the one film roll, and the control means is one A packaging apparatus characterized by performing the same control as the film driving means of the film roll.

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