JP4350940B2 - Stretch wrapping machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stretch wrapping machine that winds and packages a plastic film around a plurality of pallet-loaded loads.
[0002]
[Prior art]
[Patent Document 1]
JP 55-33854 A
[Patent Document 2]
Japanese Patent Publication No.59-40682
[Patent Document 3]
JP 2001-72012 A
In general, various products that are distributed and sold are packed in small units in cardboard boxes or the like, and are often transported, handled, and stored in a state in which a predetermined number of the packages (packages) are palletized.
[0003]
Palletized cargo tends to collapse during transportation, cargo handling, storage, etc., and the product value may decrease due to water wetting caused by rainwater, etc. during transportation, etc. . There is also a risk of unloading during storage. Therefore, recently, we have implemented a so-called stretch wrapping method that wraps plastic films such as polyethylene around multiple pallet-laden packages to prevent load collapse and protect the packages from rainwater, dirt, and unloading. Has been adopted.
[0004]
As a device for performing such stretch wrapping, conventionally, a turntable for loading a load, a carriage on which a film feeding roller is mounted, a mast that supports the carriage, and a lift that moves the carriage up and down along the mast. With the mechanism, a film roll is set on the carriage, and the palletized load is placed on the turntable. While the turntable is rotated, the film is fed to the side of the load and the carriage is moved up and down to lift the pallet. There is a packaging machine for winding a film around a packaged bag in a spiral shape (for example, JP-A-55-33854). In addition, a so-called pre-stretch type stretch wrapping machine has also been proposed in which a stretching roll is provided opposite to the feeding roll, and the film is wound around a bag with pre-stretching (pre-stretching) applied to the film with the stretching roll. (Japanese Patent Publication No. 59-40682).
[0005]
In addition, the applicant of the present application disclosed in JP-A-2001-72012,
Each of the carriage on which the feeding roller for feeding the film is mounted, a rotating mechanism that relatively rotates the carriage and the package, a lifting mechanism that moves the carriage up and down, and each of the rotating mechanism, the feeding roller, and the lifting mechanism A controller for controlling driving, and a film roll is mounted on the carriage, while the carriage and the article to be packaged are relatively rotated, the film is fed to the article to be packaged, and the carriage is moved up and down In a packaging machine that winds film on
An input device for inputting data relating to film packaging is provided, and the controller calculates the carriage lifting speed using the set values of the rotation speed and overlap amount of the rotation mechanism input by the input device, A stretch wrapping machine configured to control driving of the lifting mechanism based on the calculation result.
And an input device for inputting data relating to the film packaging, and a detecting means for detecting the winding tension of the film. The controller includes the rotation speed and the winding tension of the rotating mechanism input by the input device. A stretch wrapping machine configured to calculate a film feeding amount using each set value and a detected value of winding tension, and to control driving of a feeding roller based on the calculation result.
In addition, a stretching roller is disposed opposite the feeding roller, and an input device for inputting data relating to film packaging is provided, and the controller is configured based on a set value of the stretching ratio input by the input device. A stretch wrapping machine configured to calculate a rotation ratio between a feeding roller and a drawing roller, and to control the number of rotations of the drawing roller based on the calculation result.
Has proposed.
[0006]
[Problems to be solved by the invention]
However, according to the conventional stretch wrapping machine as described above, the operator operates the analog volume to set the rotation speed of the turntable (or arm), the lifting speed of the carriage, the rotation speed of the feeding roll, etc. The set value is greatly affected by the operator's feeling, and the set value varies. For this reason, it is difficult to always obtain a good film packaging state.
[0007]
In addition, it is necessary for operators to perform calculations such as determining each control amount such as the turntable rotation speed, carriage lifting speed, and film feed amount from data relating to film packaging, such as film overlap amount and film winding tension. Because of this, the work takes a lot of time.
[0008]
In a stretch wrapping machine, when a film is wound around a bag with pre-stretching (pre-stretch) applied to the film, conventionally, a mechanism using a transmission gear or a gear at a rate at which the feeding roller and the stretching roller are desired to be stretched. A mechanism for setting the ratio (Japanese Examined Patent Publication No. 59-40682), etc. is adopted, but since these mechanisms can only adjust the stretch ratio in stages, they are optimal for various types of luggage. There is also the problem that it is difficult to obtain film packaging.
[0009]
Further, according to the stretch wrapping machine proposed by the present applicant in Japanese Patent Application Laid-Open No. 2001-72012, although the above-mentioned problems can be solved, depending on the type and form of the load, the film may be easily cut, There was a problem that the corners were easily crushed or the cargo was easily collapsed.
[0010]
Therefore, the present inventor provides a stretch wrapping machine capable of always obtaining a good film wrapping state regardless of the type and form of the load as a result of intensive studies in view of the conventional drawbacks.
[0011]
[Means for Solving the Problems]
A stretch wrapping machine according to a first aspect of the present invention includes a carriage on which a film feeding roller is mounted, a rotation mechanism that relatively rotates the carriage and an article to be packaged, and an elevating mechanism that moves the carriage up and down. And a controller for controlling each drive of the rotation mechanism, the feeding roller, and the lifting mechanism, and a film roll is mounted on the carriage, and the film is mounted on the package while relatively rotating the carriage and the package. In the wrapping machine for winding the film around the article to be wrapped by raising and lowering the carriage, an input device for inputting data relating to the film wrapping and a detecting means for detecting the winding tension of the film are provided, The controller sets the rotation speed and winding tension of the rotating mechanism input by the input device. The film feeding amount is calculated using the value and the detected value of the winding tension, and the driving of the feeding roller is controlled based on the calculation result. The setting of the winding tension and / or the rotation speed of the rotating mechanism is performed. The setting value can be set differently when the carriage is raised and lowered.
[0012]
A stretch wrapping machine according to a second aspect of the present invention includes a carriage on which a film feeding roller is mounted, a rotation mechanism that relatively rotates the carriage and an object to be packaged, and an elevating mechanism that moves the carriage up and down. And a controller for controlling each drive of the rotation mechanism, the feeding roller, and the lifting mechanism, and a film roll is mounted on the carriage, and the film is mounted on the package while relatively rotating the carriage and the package. An input device for inputting data relating to film packaging is provided in a wrapping machine that unwinds and raises and lowers a carriage to wind a film around an object to be wrapped. The controller includes an overlap amount input by the input device. Calculate the vertical lift speed of the carriage from the rotation speed of the rotation mechanism and the calculation result Is configured to control the vertical lifting mechanism of a carriage on the basis, characterized in that the amount of overlap setting is made so that it can be set to different settings in the time and falling time increase of the carriage.
[0013]
A stretch wrapping machine according to a third aspect of the present invention includes a carriage on which a film feeding roller is mounted, a rotating mechanism that relatively rotates the carriage and an article to be packaged, and an elevating mechanism that moves the carriage up and down. And a controller for controlling each drive of the rotation mechanism, the feeding roller, and the lifting mechanism, and a film roll is mounted on the carriage, and the film is mounted on the package while relatively rotating the carriage and the package. In a wrapping machine that winds and raises and lowers a carriage to wind a film around an object to be wrapped, a stretching roller is disposed opposite the feeding roller, and an input device for inputting data relating to film packaging is provided. The controller reads out the feed rate from the set value of the stretch ratio input by the input device. The rotation ratio between the roller and the drawing roller is calculated, and the number of rotations of the drawing roller is controlled based on the calculation result, so that the setting of the drawing ratio can be set differently when the carriage is raised and lowered. It is characterized by that.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view schematically showing an overall configuration of an embodiment of a stretch wrapping machine of the present invention. The embodiment shown in FIG. 1 is a turntable rotary type stretch wrapping machine, which is a mast 2 having a lower end fixed to a base frame 1, a turntable 3, a carriage 4, a lifting mechanism 5, a film feeding device 6, and a control. A box 7 and the like are mainly configured, and a display 12 a of the touch panel type input device 12 is disposed on the front surface of the control box 7. In the stretch wrapping machine shown in FIG. 1, a press plate (platen) 8 for preventing the collapse of the load when the load W placed on the turntable 3 is rotated is installed on the top of the mast 2.
[0015]
The turntable 3 is rotatably supported at the tip of the base frame 1. A table rotation motor 30 that applies a rotational force to the turntable 3 is installed at the end of the base frame 1 on the mast 2 side.
[0016]
The carriage 4 is supported by the mast 2 so as to be movable up and down, and is moved up and down by an elevating mechanism 5. The elevating mechanism 5 includes a carriage elevating motor 50 and a belt 51 wound around a rotation shaft of the motor 50 via a pulley (not shown) or the like. The belt 51 is moved up and down by the rotation of the carriage elevating motor 50. The carriage 4 is configured to move up and down.
[0017]
A photoelectric sensor 21 for detecting a load W placed on the turntable 3 is installed on the carriage 4. The photoelectric sensor 21 is kept ON while the detection light catches the luggage W in the process in which the carriage 4 rises from the descending end (origin), and when the detection light is removed from the luggage W, that is, the photoelectric sensor 21. Becomes OFF when the upper end of the load W is exceeded.
[0018]
The film feeding device 6 is mounted on the carriage 4 described above, and includes three rollers, a feeding roller 61, a stretching roller 62, and a guide roller (non-driving roller) 63, as shown in FIGS. The guide roller 63 is rotatably supported by the load cell 64. The feeding roller 61 and the stretching roller 62 are respectively given a rotational force by a film feeding motor 71 and a film stretching motor 72. By controlling the number of rotations of the film stretching motor 72 with respect to the film feeding motor 71, a pre-stretch ( The film F can be fed out in a state in which the pre-stretching is applied.
[0019]
In the above film feeding device 6, as shown in FIG. 3, the film F from the film roll R is passed between the stretching roller 62 and the feeding roller 61, and passes from the feeding roller 61 through the guide roller 63. The film F is fed out toward the side of the load W on the turntable 3.
[0020]
The guide roller 63 is supported by the load cell 64, and the load cell 64 can directly detect the force acting on the guide roller 63, that is, the load (tension) applied to the film F fed toward the load W. Information obtained by digitizing the tension applied to the film F from the output can be obtained.
[0021]
In the stretch wrapping machine according to this embodiment, the film roll R is set on the carriage 4, and the pallet-loaded baggage W is placed on the turntable 3, while the turntable 3 is rotated and the film F is loaded on the baggage W. The film F can be wound around the pallet-loaded luggage W in a spiral shape by moving the carriage 4 up and down and moving the carriage 4 up and down.
[0022]
Next, the configuration of the control system of this embodiment will be described with reference to the block of FIG. 4 and FIG. The control system of this embodiment includes a controller 11 and a touch panel input device 12 for setting data relating to packaging conditions in the controller 11.
[0023]
The controller 11 sends control signals to the inverters 13, 15, 16, and 17 that are individually connected to the table rotation motor 30, the carriage lifting / lowering motor 50, the film feeding motor 71, and the film stretching motor 72 via the D / A converter 18. Supply. The output of the photoelectric sensor 21 installed in the carriage 4 is input to the controller 11, and the output of the load cell 64 installed in the film feeding device 6 is input via the A / D converter 19.
[0024]
The touch panel type input device 12 selectively displays any one of an automatic operation screen D1, a manual operation screen D2, a setting screen D3, or a data display screen D4 as shown in FIGS. 5 to 11 on the display 12a. be able to. The screen can be selected by an operation of pressing the letters “automatic”, “manual”, “setting” or “data” displayed on the upper part of each screen D1, D2, D3, D4 with a finger.
[0025]
As shown in FIG. 5, the automatic operation screen D1 displays packaging conditions such as packaging form (double winding / single winding), top sheet, film cut, presence / absence of presser plate (platen), and the packaging quantity. Is displayed, and keys for selecting programs P1 to P5 described later are displayed.
[0026]
On the manual operation screen D2, as shown in FIG. 6, a button for manually operating the rotation of the turntable 3 and a button for manually operating the raising and lowering of the carriage 4 and the presser plate (platen) 8 are displayed. Is done.
[0027]
As shown in FIGS. 7 to 10, the setting screen D3 is provided with three setting patterns: a setting A pattern D31, a setting B pattern D32, and a setting C pattern D33. In the setting A pattern, as shown in FIGS. 7 and 8, the turntable rotation speed, upper winding tension, lower winding tension, upper / lower switching position, upper folding amount, package height, overlap amount, upper winding number , Number of windings, stretch rate, double or single packaging method, use of top sheet, use of top platen, use of terminal automatic cut, and keys to specify each item and settings An UP / DOWN key for inputting a numerical value to be set for the item and a key for selecting programs P1 to P5 are displayed. On the setting A pattern screen D31, the setting value of each setting item is displayed digitally (numerical value), and the numerical value of each setting item can be set by operating the UP / DOWN key. Then, five types of setting data can be stored by pressing the data write key after each item setting and then pressing the program selection key.
[0028]
In the setting A pattern, as shown in FIGS. 7 and 8, the winding tension can be set differently between the upper part and the lower part. This is to reduce the winding tension at the position where the film is wound around the pallet in order to solve the problem that the film is easily cut at the corner. Also, when slippage is likely to occur between the pallet and the package, the lower winding tension may be increased. When the strength of the package is weak, or when the film with a tight corner of the package is easily cut The upper winding tension should be weakened. In addition, the height of the package can be set regardless of the automatic detection by the photoelectric sensor. The package can be set when the package cannot be detected by a photoelectric sensor such as a car or when the package is packed up to the top of the package. Used when there is no need. When the use of the top sheet is selected, when the carriage is raised to the uppermost position, it is easy to pause and apply the top sheet.
[0029]
In the setting B pattern, as shown in FIG. 9, the number of rotations of the turntable, the upper winding tension, the intermediate winding tension, the lower winding tension, the switching position between the intermediate part and the lower part, the upper folding amount, the package height, the overlap amount , Top winding number, bottom winding number, stretching rate, winding start height, double or single packaging method, use of top sheet, use of top platen, use of automatic terminal cut A key for designating, a UP / DOWN key for inputting a numerical value to be set for each setting item, and a key for selecting the programs P1 to P5 are displayed.
[0030]
In the setting B pattern, the winding tension can be set differently at the upper part, the middle part and the lower part because the upper end of the packaged item is particularly weak or a part of the packaged item is particularly easily deformed. The winding tension setting can be changed depending on the height.
[0031]
In the setting C pattern, as shown in FIG. 10, the turntable rotation speed when the carriage is raised, the turntable rotation speed when the carriage is lowered, the winding tension when the carriage is raised, the winding tension when the carriage is lowered, the upper folding amount, the winding Starting height, package height, overlap amount when the carriage is raised, overlap amount when the carriage is lowered, number of upper windings, number of lower windings, stretch rate when the carriage is lifted, stretch rate when the carriage is lowered, double or single Key to specify each item of the packaging method, whether to use the top sheet, whether to use the top platen, whether to use the terminal automatic cut, and UP to enter the numerical value to be set for each setting item A / DOWN key and keys for selecting programs P1 to P5 are displayed.
[0032]
In the set C pattern, the turntable rotation speed, winding tension, overlap amount, and stretching ratio can be changed when the carriage is raised and lowered, respectively. In this setting C pattern, when the film is wound around a tightly wrapped object such as a tile or brick, the film stretching ratio and winding tension are reduced at the first winding from the beginning to the upper end. Thus, the film can be made difficult to cut, and when returning from the upper end to the lower end, the stretch ratio and the winding tension of the film can be increased and the film can be tightly wrapped. Also, when packaging items such as bottles and paperboard that are likely to collapse, the turntable is slowed down during the first wrapping from the beginning to the upper end, the winding tension is weakened, and the overlap amount is reduced. When returning from the upper end to the lower end to prevent the package from collapsing, the turntable rotates faster to shorten the packaging time, the wrapping tension is increased, the amount of overlap is increased, and the packaging is secured.
[0033]
As shown in FIG. 11, the data display screen D4 displays the program-by-program packaging quantity and the data of the previous package.
[0034]
Based on the set value set by the touch panel type input device 12 and the output signals of the photoelectric sensor 21 and the load cell 64, the controller 11 rotates the table rotation speed, carriage lifting speed, carriage upper limit position, film feed amount, stretching Control the ratio. Details of each processing will be described below.
[Table Rotation Speed] The table rotation speed setting value set by the touch panel input device 12 is taken in, and the control signal is D / A converted to the inverter 13 so that the rotation speed of the table rotation motor 30 matches the setting value. The frequency of the electric power supplied to the table rotation motor 30 is controlled via the device 18.
[Carriage Lifting Speed] Taking each setting value of the table rotation speed and overlap amount set by the touch panel input device 12, and calculating the carriage lifting speed with respect to the rotation speed of the turntable 3 based on these setting values, A control signal is supplied to the inverter 15 via the D / A converter 18 so as to match the calculated lifting speed of the carriage 4 with the calculated value, and the frequency of the electric power introduced into the carriage lifting motor 50 is controlled.
[Upper limit position of carriage] When the package height is set to photoelectric sensor detection, the set value of the folding amount set by the touch panel input device 12 is taken in, and the set value and detection OFF signal from the photoelectric sensor 21 are taken. The upper limit position when the carriage 4 is raised is calculated using the distance between the photoelectric sensor 21 and the upper end of the film roll R, and the time until the carriage 4 reaches the upper limit position is calculated from the calculated value and the carriage lifting speed. And the upper limit position when the carriage is raised is controlled. When a numerical value is input for the package height, the upper limit position when the carriage is lifted is controlled from the carriage lifting speed and the carriage lifting time.
[Film feed amount] Taking each set value of the table rotation speed and winding tension set by the touch panel input device 12, the film feed amount is calculated based on each set value and the output of the load cell 64. In order to make the feeding amount by the feeding roller 61 coincide with the value, a control signal is supplied to the inverter 16 via the D / A converter 18 to control the frequency of electric power introduced into the film feeding motor 71.
[Stretching ratio] The setting value of the stretching ratio set by the touch panel input device 12 is taken, the rotation ratio between the feeding roller 61 and the stretching roller 62 is calculated based on the set value, and this calculated value is set as the target value. Then, a control signal is supplied to the inverter 17 via the D / A converter 18 to control the number of rotations of the film stretching motor 72 relative to the film feeding motor 71.
[0035]
【The invention's effect】
As described above, the stretch wrapping machine according to claim 1 of the present invention includes a carriage on which a film feeding roller is mounted, a rotation mechanism that relatively rotates the carriage and a package, and a vertical movement of the carriage. And a controller for controlling each drive of the rotating mechanism, the feeding roller, and the lifting mechanism, a film roll is mounted on the carriage, and the film is rotated while relatively rotating the carriage and the package. An input device for inputting data relating to film packaging and a detecting means for detecting the winding tension of the film are provided in a packaging machine for winding a film around the package by moving the carriage up and down and moving the carriage up and down. The controller controls the rotation speed of the rotation mechanism input by the input device and the winding tension. The film feed amount is calculated using each set value of the application and the detected value of the winding tension, and the driving of the feeding roller is controlled based on the calculation result, and the winding tension and / or the rotation mechanism is controlled. Since the rotation speed can be set to different setting values when the carriage is raised and lowered, film breakage and load collapse are prevented.
[0036]
According to a second aspect of the present invention, there is provided a stretch wrapping machine comprising: a carriage on which a film feeding roller is mounted; a rotating mechanism that relatively rotates the carriage and an article to be packaged; and a lift that moves the carriage up and down. And a controller for controlling each drive of the rotating mechanism, the feeding roller, and the lifting mechanism, and a film roll is mounted on the carriage, and the film is wrapped while the carriage and the package are relatively rotated. An input device for inputting data relating to film packaging is provided in a wrapping machine for winding a film around an article to be wrapped by moving the carriage up and down, and the controller includes an overload input by the input device. Calculate the vertical lift speed of the carriage from the lap amount and the rotation speed of the rotation mechanism, and calculate It is configured to control the vertical lift mechanism of the carriage based on the results, and the overlap amount can be set to different setting values when the carriage is raised and lowered, so film breakage and load collapse Is prevented.
[0037]
According to a third aspect of the present invention, there is provided a stretch wrapping machine comprising: a carriage on which a film feeding roller is mounted; a rotation mechanism that relatively rotates the carriage and an article to be packaged; and a lift that moves the carriage up and down. And a controller for controlling each drive of the rotating mechanism, the feeding roller, and the lifting mechanism, and a film roll is mounted on the carriage, and the film is wrapped while the carriage and the package are relatively rotated. In a wrapping machine that winds up a product and winds a carriage up and down to wind a film around a packaged object, a stretching roller is disposed opposite the feeding roller, and an input device for inputting data relating to film packaging is provided. The controller is fed from the set value of the stretch ratio input by the input device. It is configured to calculate the rotation ratio between the roller and the drawing roller, and to control the number of rotations of the drawing roller based on the calculation result. The drawing ratio is set differently when the carriage is raised and lowered. Since it is made possible, film breakage and load collapse are prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an overall configuration of an embodiment of the present invention.
FIG. 2 is a front view showing a configuration of a film feeding device used in the embodiment of the present invention.
FIG. 3 is a plan view schematically showing the configuration of the film feeding apparatus.
FIG. 4 is a block diagram showing a configuration of a control system according to the embodiment of the present invention.
FIG. 5 is a diagram showing an example of a screen displayed on the display of the touch panel type input device.
FIG. 6 is a diagram showing an example of a screen that is also displayed on the display.
FIG. 7 is a diagram showing an example of a screen that is also displayed on the display.
FIG. 8 is a diagram showing an example of a screen that is also displayed on the display.
FIG. 9 is a diagram showing an example of a screen similarly displayed on the display.
FIG. 10 is a diagram showing an example of a screen that is also displayed on the display.
FIG. 11 is a diagram showing an example of a screen similarly displayed on the display.
[Explanation of symbols]
1 Base frame
2 Mast
3 Turntable
30 Table rotation motor
4 Carriage
5 Lifting mechanism
50 Carriage lift motor
6 Film feeding device
60 Film feeding motor
61 Feeding roller
62 Stretching roller
63 Guide roller
64 load cell
7 Control box
71 Film feeding motor
72 Film stretching motor
11 Controller
12 Touch panel type input device
12a Display screen
13 Inverter (for table rotation motor)
15 Inverter (for carriage lifting motor)
16 Inverter (for film feeding motor)
17 Inverter (for film stretching motor)
18 D / A converter
19 A / D converter
21 Photoelectric sensor
R film roll
F film
W Luggage (packaged items)

Claims (3)

  Each of the carriage on which the feeding roller for feeding the film is mounted, a rotating mechanism that relatively rotates the carriage and the package, a lifting mechanism that moves the carriage up and down, and each of the rotating mechanism, the feeding roller, and the lifting mechanism A controller for controlling driving, and a film roll is mounted on the carriage, while the carriage and the article to be packaged are relatively rotated, the film is fed to the article to be packaged, and the carriage is moved up and down In the wrapping machine for winding the film, an input device for inputting data relating to the film wrapping and a detecting means for detecting the winding tension of the film are provided, and the controller includes a rotation mechanism input by the input device. Using each setting value of rotation speed and winding tension, and detection value of winding tension The film feeding amount is calculated, and the driving of the feeding roller is controlled based on the calculation result. The setting value of the winding tension and / or the rotational speed of the rotating mechanism is different when the carriage is raised and lowered. Stretch wrapping machine, which can be set to   Each of the carriage on which the feeding roller for feeding the film is mounted, a rotating mechanism that relatively rotates the carriage and the package, a lifting mechanism that moves the carriage up and down, and each of the rotating mechanism, the feeding roller, and the lifting mechanism A controller for controlling driving, and a film roll is mounted on the carriage, while the carriage and the article to be packaged are relatively rotated, the film is fed to the article to be packaged, and the carriage is moved up and down In the wrapping machine for winding the film, an input device for inputting data relating to the film wrapping is provided, and the controller controls the vertical movement speed of the carriage based on the overlap amount input by the input device and the rotation speed of the rotation mechanism. And control the vertical lift mechanism of the carriage based on the calculation result Is configured so that, stretch wrapping machine, wherein the amount of overlap setting is made so that it can be set to different settings in the time and falling time increase of the carriage.   Each of the carriage on which the feeding roller for feeding the film is mounted, a rotating mechanism that relatively rotates the carriage and the package, a lifting mechanism that moves the carriage up and down, and each of the rotating mechanism, the feeding roller, and the lifting mechanism A controller for controlling driving, and a film roll is mounted on the carriage, while the carriage and the article to be packaged are relatively rotated, the film is fed to the article to be packaged, and the carriage is moved up and down In the wrapping machine for winding a film, a stretching roller is disposed opposite to the feeding roller, and an input device for inputting data relating to the film packaging is provided. The controller is input by the input device. Calculate the rotation ratio between the feeding roller and the drawing roller from the set value of the drawing ratio, Results are configured to control the rotational speed of the stretching roller based, stretch wrapping machine, wherein the setting of the drawing ratio in the time and falling time of rise of the carriage is made to be set to different settings.

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