WO2016121489A1

WO2016121489A1 - Packaging device

Info

Publication number: WO2016121489A1
Application number: PCT/JP2016/050703
Authority: WO
Inventors: 佑樹鯛; 一典和田
Original assignee: 株式会社イシダ
Priority date: 2015-01-26
Filing date: 2016-01-12
Publication date: 2016-08-04
Also published as: JP6450404B2; JPWO2016121489A1

Abstract

A packaging device is provided which can avoid damage to a film even when packaging articles of diverse shapes. This packaging device 1 is provided with a heating unit 80 which heats a film F positioned underneath the article W to be packaged, an external force applying unit 70 which applies, to the article W to be packaged positioned on the heating unit 80, an external force that increases the contact pressure between the heating unit 80 and the article W, and a control unit 90 which controls the temperature of the heating unit 80 and operation of the external force applying unit 70, wherein the control unit 90 acquires the elongation ratio of the stretched film F, and, on the basis of said elongation ratio, changes the temperature of the heating unit 80, the external force applied to the article W to be packaged by the external force applying unit 70, and/or the time during which the external force applying unit 70 applies an external force to the article W to be packaged.

Description

Packaging equipment

The present invention relates to a packaging device.

As a conventional packaging device, for example, a device described in Patent Document 1 is known. The packaging device described in Patent Document 1 is a device that pushes up an object to be packaged from below on a stretched film and folds the peripheral edge of the film to the lower side of the object to be heat sealed. The packaging apparatus includes a heating unit that heats a film on the lower side of the packaged item, and a pressing unit that presses the packaged item against the heating unit, and forms two types of films into the shape of the packaged item. We use properly by (size).

JP 2003-95208 A

When packaging a packaged object having various shapes (sizes) using the packaging apparatus as described above, the elongation rate of the film increases accordingly as the packaged object becomes larger. When the elongation percentage of the film increases, the film thickness decreases and the film strength decreases. In particular, when packaging an object to be packaged with one type of film, the elongation rate of the film is further increased as the object to be packaged becomes larger. For this reason, when the article to be packaged is pressed by the pressing portion, the film may be broken by contact with the pressing portion. Moreover, since the durability with respect to heat will also become low when the thickness of a film becomes small, when a film is heated by a heating part, there exists a possibility that a film may melt too much and torn.

This invention aims at providing the packaging apparatus which can suppress the failure | damage of a film, even when packaging the packaged goods of various shapes.

A packaging device according to one aspect of the present invention is a packaging device that covers an object to be packaged with a stretched film and overlaps the periphery of the film on the lower side of the object to be packaged. A heating unit that heats the film positioned on the side, an external force applying unit that applies an external force to the packaged object positioned on the heating unit so that the contact pressure between the heating unit and the packaged object increases, and heating A control unit that controls the temperature of the part and the operation of the external force application unit, the control unit obtains the elongation rate of the stretched film, and based on the elongation rate, the temperature of the heating unit, the external force application unit is At least one of the external force applied to the package and the time during which the external force applying unit applies the external force to the package is changed.

In this packaging apparatus, the control unit obtains the stretch rate of the stretched film, and based on the stretch rate, the temperature of the heating unit, the external force applied to the package by the external force applying unit, and the external force applying unit are Change at least one of the times for applying external force to the package. As a result, the packaging device can be controlled in accordance with the elongation rate of the film. For example, when the elongation rate of the film is high, the temperature of the heating unit is lowered or the external force applied to the package is reduced. You can do it. Therefore, since it can suppress that an excessive force or heat is added to a low intensity | strength film, it can suppress that a film breaks. Therefore, in this packaging apparatus, even if it is a case where the packaged goods of various shapes are packaged, the damage of a film can be suppressed.

In one embodiment, the elongation percentage of the film may be set based on at least one piece of information on the dimensions of the film, the shape of the package, and the height of the package. The film is generally wound in a roll shape, drawn out from the roll as much as it is used, stretched in one direction (width direction), and attached to the package. The elongation percentage of the film increases as the shape of the packaged object increases. Therefore, the elongation percentage of the film can be appropriately set by setting the elongation percentage based on at least one of the dimensions of the film, the shape of the packaging object, and the height of the packaging object. Therefore, in the packaging device, it is possible to perform an appropriate process according to the elongation rate, and the damage to the film can be further suppressed.

In one embodiment, the control unit includes an elongation rate of the film, a temperature of the heating unit at the elongation rate, an external force applied by the external force application unit to the package at the elongation rate, and an external force application unit at the elongation rate. May have information associated with at least one of the times for applying external force to the package, and may control at least one of the heating unit and the external force applying unit based on the acquired elongation rate and information. . Thereby, the control according to the elongation rate of the film can be selected quickly and accurately. Therefore, it is possible to improve the efficiency of processing in the control unit.

In one embodiment, the article to be packaged is a product on which a product is placed on a tray, and includes a storage unit that stores product information about the product, and the control unit is based on the film elongation rate and the product information. In addition, at least one of the heating unit and the external force applying unit may be controlled. By adding product information to the film elongation rate, processing according to the characteristics of the product (for example, the shape such as the size and height of the product) can be performed. Therefore, the heat applied to the package and / or the external force applied to the package can be set more appropriately.

According to the present invention, damage to the film can be suppressed even when packaging objects having various shapes.

FIG. 1 is a perspective view illustrating an appearance of a packaging device according to an embodiment. FIG. 2 is a front view showing the internal configuration of the packaging device. FIG. 3 is a side view showing the internal configuration of the packaging device. FIG. 4 is a plan view showing an internal configuration of the packaging device. FIG. 5 is a block diagram showing the configuration of the packaging device. FIG. 6 is a diagram showing a table in which elongation rate is associated with pressure, pressing time, and heater temperature. FIG. 7 is a flowchart showing the operation of the control unit. FIG. 8 is a diagram for explaining the operation of the packaging device. FIG. 9 is a diagram for explaining the operation of the packaging device. FIG. 10 is a diagram for explaining the operation of the packaging device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a perspective view showing an appearance of a packaging device according to an embodiment. FIG. 2 is a front view showing an internal configuration of the packaging apparatus shown in FIG. FIG. 3 is a side view showing the internal configuration of the packaging device. FIG. 4 is a plan view showing an internal configuration of the packaging device. FIG. 5 is a block diagram showing the configuration of the packaging device. In the following description, the vertical direction in FIG. 2 is the “vertical direction” of the packaging device 1, the horizontal direction is the “horizontal direction” of the packaging device 1, and the horizontal direction in FIG.

The packaging apparatus 1 shown in FIGS. 1 to 5 pushes up a package W on which a product G such as fresh food is placed on a tray T from below on a stretch film F as a stretched packaging material. The stretch film F is an apparatus for superposing (folding) the peripheral portion of the stretch film F on the lower side of the tray T and heat-sealing the superposed portion to stretch-wrap the article W to be packaged. The packaging device 1 of the present embodiment has a weighing function and a pricing function by labeling in addition to a film packaging function.

The packaging device 1 includes a weighing-in mechanism 10, a lifter mechanism 20, a roll support mechanism 30, a film delivery mechanism 40, a film transport mechanism 50, a folding mechanism 60, a pressing mechanism (external force applying unit) 70, heating A mechanism (heating unit) 80, a control unit 90, a label printer 100, and a label issuing machine 110 are provided.

[Weighing-in mechanism]
The weighing-in mechanism 10 measures the product G of the article W to be packaged and carries the article W into the packaging device 1. The weighing-in mechanism 10 is provided at the front center of the main body 3 of the packaging device 1. The weighing-in mechanism 10 is pushed out by a weighing instrument 12 that measures the weight of the article W to be packaged placed on the weighing tray 11, an extrusion bar 13 that pushes the article W to the lifter mechanism 20, and an extrusion bar 13. The transporting conveyor 14 that transports the packaged article W to the lifter mechanism 20 and the camera 15 that images the packaged article W are provided. The operation of the weighing-in mechanism 10 is controlled by the control unit 90.

The measuring instrument 12 weighs the article W and outputs information indicating the weight of the article W to the control unit 90. The extrusion bar 13 is provided on the weighing tray 11 and extends along the width direction of the weighing tray 11. The extrusion bar 13 is located at the front end of the weighing tray 11 in the initial position, and is provided so as to be movable in the front-rear direction by a driving device (not shown). The conveyor 14 is provided on the rear end side of the weighing tray 11, and is provided so as to be movable in the left-right direction by a driving device (not shown). The camera 15 captures an image of the packaged object W placed on the weighing tray 11 and outputs the captured image information to the control unit 90.

As shown in FIG. 3, when the article W to be packaged is placed on the measuring instrument 12, the weighing-in mechanism 10 measures the weight of the article W to be packaged by the measuring instrument 12, and The to-be-packaged object W is imaged with the camera 15 arrange | positioned. The weighing-in mechanism 10 takes an image of the article W to be packaged with the camera 15, pushes the article W to be lifted toward the lifter mechanism 20 by the push bar 13, and conveys the article W to be lifted to the lifter mechanism 20 by the conveyor 14.

The weighing-in mechanism 10 has a centering mechanism for the article W to be packaged. Specifically, the weighing-in mechanism 10 centers the article to be packaged W by operating the transport conveyor 14 according to the position of the article W to be packaged acquired based on the image captured by the camera 15. Specifically, the weighing-in mechanism 10 moves the position of the transport conveyor 14 in the left-right direction in accordance with the position of the article W to be packaged on the weighing tray 11, and the article W to be packaged pushed out by the push bar 13. The conveyor 14 is positioned in the front (center). The weighing-in mechanism 10 moves the position of the conveyor 14 to the center which is the initial position when the article W to be packaged is positioned on the conveyor 14, and then moves the article W to the lifter mechanism 20 by the conveyor 14. Transport. As a result, the weighing-in mechanism 10 always feeds the package W to the lifter mechanism 20 at the same position even when the package W is placed at a position other than the central portion of the weighing tray 11. .

[Lifter mechanism]
The lifter mechanism 20 pushes up the article W to be packaged upward. The lifter mechanism 20 is provided on the rear side of the weighing-in mechanism 10. When the lifter mechanism 20 receives the package W from the weighing-in mechanism 10, the lifter mechanism 20 pushes up the package W upward. The lifter mechanism 20 is rotatably provided at a support base 21, a plurality of support bars 22 fixed on the support base 21, and upper ends of the support bars 22, and supports the bottom surface of the tray T. A support member 23 and an electric ball screw mechanism 24 that moves the support base 21 up and down are provided. The operation of the lifter mechanism 20 is controlled by the control unit 90.

In the lifter mechanism 20, the support bar 22 and the support member 23 move in the vertical direction by the movement of the support base 21 by the electric ball screw mechanism 24. Each support bar 22 is provided with a hinge (not shown) that bends forward, backward, left and right at the center portion thereof. Thereby, each support bar 22 temporarily falls when a first folding plate 61, a second folding plate 62, and a third folding plate 63, which will be described later, enter the lower portion of the tray T.

[Roll support mechanism]
The roll support mechanism 30 holds the film roll R. In the present embodiment, the roll support mechanism 30 is provided on each side of the main body 3. That is, the packaging device 1 can use two film rolls R. The film roll R is wound with multiple stretch films F having stretchability. The stretch film F of one film roll R and the stretch film F of another film roll R may be the same type or different types. In this embodiment, the two film rolls R are different in type and the width dimension of the stretch film F is different. Each of the stretch films F is, for example, polyolefin-based or vinyl chloride.

The roll support mechanism 30 has a roll bar 31. The roll bar 31 inserts the film roll R and holds the film roll R with a holder or the like. Each roll bar 31 is rotatably supported by the main body 3 and is driven by one film roll drive motor 32. The film roll drive motor 32 is capable of forward / reverse rotation, drives one roll bar 31 during forward rotation, and drives the other roll bar 31 during reverse rotation.

[Film delivery mechanism]
The film delivery mechanism 40 delivers the stretch film F drawn from the film roll R to the first feeder unit 51 and the second feeder unit 52 of the film transport mechanism 50 described later. As shown in FIG. 2, the film delivery mechanism 40 includes a delivery roller 41, a delivery motor 42 that drives the delivery roller 41, a film insertion plate unit 43, and a film insertion plate drive that moves the film insertion plate unit 43 up and down. A motor 44.

The feeding roller 41 is a roller for feeding the stretch film F from the film roll R. The feeding roller 41 extends along the width direction of the film roll R (the front-rear direction of the packaging device 1). The feeding roller 41 is positioned above the roll support mechanism 30 that supports the film roll R, and is disposed outside the roll bar 31 in the left-right direction. The feeding roller 41 is connected to the feeding motor 42 via the belt 45 and rotates by the operation of the feeding motor 42.

The film insertion plate unit 43 is composed of two

plate members

47 and 48. As shown in FIG. 2, the film insertion plate unit 43 is disposed above the film roll R supported by the roll support mechanism 30.

The film insertion plate drive motor 44 moves the film insertion plate unit 43 up and down. The film insertion plate drive motor 44 moves the film insertion plate unit 43 up and down via a link mechanism. The film delivery mechanism 40 delivers the stretch film F of the film roll R supported by the roll support mechanism 30 to the film transport mechanism 50 by moving the film insertion plate unit 43 by the film insertion plate drive motor 44. The operation of the film insertion plate drive motor 44 is controlled by the control unit 90.

[Film transport mechanism]
The film transport mechanism 50 receives the stretch film F fed from the film roll R by the film feed mechanism 40, transports the stretch film F to the central portion of the lifter mechanism 20, and stretches and holds the stretch film F. The film transport mechanism 50 includes a first feeder unit 51, a second feeder unit 52, a first feeder moving unit 53, a second feeder moving unit 54, and a feeder driving unit 55.

As shown in FIG. 3, the first feeder unit 51 and the second feeder unit 52 are arranged to face each other. The first feeder unit 51 is disposed on the front side of the packaging device 1. The second feeder unit 52 is disposed on the rear side of the packaging device 1. The first feeder unit 51 and the second feeder unit 52 sandwich the both sides of the stretch film F that is laterally fed between the upper and lower belts, and convey the stretch film F by the operation of the feeder drive unit 55.

Each of the first feeder unit 51 and the second feeder unit 52 is movably supported by

slide shafts

56 and 57 extending along the width direction of the stretch film F (the front-rear direction of the packaging device 1). The first feeder moving unit 53 moves the first feeder unit 51 along the extending direction of the slide shafts 56 and 57 (the width direction of the stretch film F). The second feeder moving unit 54 moves the second feeder unit 52 along the extending direction of the

slide shafts

56 and 57.

Each of the first feeder unit 51 and the second feeder unit 52 has a plurality of clamps (not shown). The clamp is operated by a solenoid, and holds and releases the stretch film F.

The film transport mechanism 50 has a cutter unit 58. The cutter unit 58 cuts the stretch film F. Specifically, the cutter unit 58 includes the film delivery mechanism 40 and the film transport mechanism after the stretch film F transferred from the film delivery mechanism 40 to the film transport mechanism 50 is transported by a predetermined amount in the film transport mechanism 50. The stretch film F is cut between 50. The cutter part 58 has a cutting blade 58 a that is larger than the width dimension of the stretch film F. The cutter part 58 cut | disconnects the stretch film F by moving the cutting blade 58a with an actuator. The operation of the cutter unit 58 is controlled by the control unit 90.

Two cutter parts 58 are provided as shown in FIG. One cutter unit 58 cuts the stretch film F fed from the right film roll R. The other cutter unit 58 cuts the stretch film F fed from the left film roll R.

[Folding mechanism]
The folding mechanism 60 folds the stretch film F to the lower side of the tray T, and overlaps the peripheral edge of the stretch film F on the lower side of the tray T. As shown in FIGS. 2 and 3, the folding mechanism 60 includes a first folding plate 61, a second folding plate 62, a third folding plate 63, and a folding rod 64.

The first folding plate 61 and the second folding plate 62 fold both ends in the transport direction of the stretch film F to the lower side of the tray T. As shown in FIG. 2, the first folding plate 61 and the second folding plate 62 are provided at the same height position. The first folding plate 61 and the second folding plate 62 are provided so as to be horizontally movable by a motor and a timing belt (not shown). The operation of the motor is controlled by the control unit 90.

The third folding plate 63 folds the side part of the stretch film F on the second feeder unit 52 side to the lower side of the tray T. The third folding plate 63 is located above the first folding plate 61 and the second folding plate 62. The third folding plate 63 is provided to be horizontally movable by a motor and a timing belt (not shown). The operation of the motor is controlled by the control unit 90.

The folding bar 64 is arranged such that the side of the stretch film F on the first feeder unit 51 side is folded below the tray T when the tray T is discharged by the discharge pusher 65 that pushes the tray T toward the discharge table 66. Has been.

As shown in FIG. 2, the discharge pusher 65 is divided into left and right parts so as not to contact a pressing plate 73 and a pressing roller 74 of a pressing mechanism 70 described later.

[Pressing mechanism]
The holding mechanism 70 applies an external force to the article W to be packaged located on the heating roller 82 described later so that the contact pressure between the heating roller 82 and the article W to be packaged is increased. The pressing mechanism 70 includes a servo motor 71, an arm 72 connected to the servo motor 71, a pressing plate 73 connected to the arm 72, and a plurality of pressing rollers 74 provided on the pressing plate 73. Yes.

The arm 72 has one end connected to the servo motor 71. The arm 72 swings in conjunction with the operation of the servo motor 71. The holding plate 73 is connected to the other end of the arm 72. The pressing plate 73 is attached to the arm 72 so as to maintain the level. The pressing roller 74 is provided at the front end of the pressing plate 73. The pressing roller 74 is, for example, a sponge-like roller that uses silicon as a raw material. The pressing roller 74 is rotatably attached to the pressing plate 73. In the pressing mechanism 70, when the arm 72 is swung by the drive of the servo motor 71, the height position of the pressing plate 73 is changed accordingly.

The pressing mechanism 70 presses the article W to be heated against the heating roller 82 when the heating mechanism 80 heat seals the stretch film F folded under the tray T while pushing the tray T onto the discharge table 66 by the discharge pusher 65. . Thereby, the contact pressure between the heating roller 82 and the article W to be packaged is increased. The force and pressing time for the pressing mechanism 70 to press the article W to be packaged are adjusted by driving the servo motor 71. The operation of the servo motor 71 is controlled by the control unit 90.

The pressing mechanism 70 presses the package W with its own weight such as the pressing plate 73 when the package W is pushed up by the lifter mechanism 20 and stopped. At this time, the servo motor 71 is not driven. Thereby, the holding mechanism 70 suppresses that the packaged article W loses its posture and falls.

[Heating mechanism]
The heating mechanism 80 heats and heat-seals the stretch film F superimposed on the lower side of the tray T. The heating mechanism 80 includes a conveyance roller 81 and a heating roller 82. The heating mechanism 80 heat seals the article W to be packaged pushed out by the discharge pusher 65 while being conveyed by the conveying roller 81 and the heating roller 82.

The conveyance roller 81 is disposed before and after the heating roller 82. For example, a plurality of conveying rollers 81 are arranged with the heating roller 82 interposed therebetween. In the present embodiment, two heating rollers 82 are arranged. The conveyance roller 81 and the heating roller 82 are rotatably supported by a support member (not shown).

The heating roller 82 has a cylindrical shape, and a cylindrical heater 83 (see FIG. 5) is inserted therein. The heater 83 is an electric cartridge heater. The heater 83 is not in contact with the heating roller 82. Thereby, the heater 83 does not rotate together with the heating roller 82. The temperature of the heater 83 is controlled by the control unit 90. The heating mechanism 80 includes a temperature sensor 84 (see FIG. 5) that detects the temperature of the heater 83. The control unit 90 controls the temperature of the heater 83 based on a signal indicating the temperature output from the temperature sensor 84.

[Control unit]
The control unit 90 controls the operation of the packaging device 1. The control unit 90 is a computer configured by a CPU 91, a ROM 92, and a RAM 93, and is connected to each unit configuring the packaging device 1. The ROM 92 stores a control program for controlling the packaging device 1. The CPU 91 controls the packaging device 1 based on a control program stored in the ROM 92. The RAM 93 functions as a work memory when the CPU 91 executes a control program stored in the ROM 92. Further, the control unit 90 has a display panel 94 and operation keys 95. The display panel 94 is a touch panel display, and operation buttons are also arranged on the panel.

The control unit 90 controls the operation of each of the above mechanisms, calculates the price of the product G based on a signal indicating the weight of the product G measured by the weighing-in mechanism 10, and determines the weight and price of the product G. The operation of the label printer 100 and the label issuing machine 110 that prints etc. on the label is controlled.

A storage unit 96 is connected to the control unit 90. The storage unit 96 stores a film database DB1, a product database DB2, and a tray database DB3. In the film database DB1, data relating to the properties of a plurality of types of stretch films F are stored for each type of stretch film F. Specifically, the film database DB1 stores data such as the thickness, material, and film width of the stretch film F for each film number.

In the product database DB2, product information of the product G (unit price data and data related to the properties of the product G) is stored for each type of product G. Specifically, in the product database DB2, for each call number of the product G, data such as the shape of the product G, unit price data of the product G, and data such as the tray number of one or a plurality of trays T to be used are stored. It is remembered. In the tray database DB3, data relating to the properties of the tray T is stored for each type of the tray T. The tray database DB3 stores, for each tray number, data such as the size, shape, material, and tare weight of the tray T (tray weight or tray weight plus film weight).

Each database DB1, DB2, DB3 can be rewritten to update data. The data can be updated by inputting from the display panel 94 and the operation keys 95 or by receiving data transferred from an external device.

The control unit 90 acquires the stretch rate of the stretched stretch film F, and based on the stretch rate, the temperature of the heating roller 82, the force by which the press mechanism 70 presses the package W, and the press mechanism 70 are covered. The time for pressing the package W is changed. The stretch elongation rate is determined as follows.
Elongation rate = ((length after stretching) / (length before stretching)) × 100 (%)

The length before stretching of the stretch film F and the length after stretching are determined based on the type of the stretch film F and the shape of the tray T. Specifically, the control unit 90 acquires the shape of the tray T from the tray database DB3 based on the image captured by the camera 15, and uses the two film rolls R based on the shape of the tray T. One film roll R is selected. Based on the film database DB1, the control unit 90 acquires the width dimension of the stretch film F of the selected film roll R, that is, the length before the stretch film F is stretched. Based on the shape of the tray T, the control unit 90 acquires the amount by which the stretch film F is stretched by the first feeder unit 51 and the second feeder unit 52, and after stretching the stretch film F based on the stretch amount. Get the length. The control unit 90 calculates the elongation percentage of the stretch film F by applying the obtained length before stretching of the stretch film F and the length after stretching to the above formula. The elongation rate may be acquired from a table in which the length before stretching of the stretch film F and the length after stretching are associated in advance.

When the control unit 90 calculates and acquires the elongation percentage of the stretch film F, the control unit 90 refers to the table (information) TB (see FIG. 6) of the control unit 90, and the temperature of the heating roller 82 and the pressing mechanism 70 are to be packaged. The force for pressing W and the time for which the pressing mechanism 70 presses the article W to be packaged are set. FIG. 6 is a diagram showing a table in which elongation rate is associated with pressure, pressing time, and heater temperature. In FIG. 6, the relationships of N1> N2> N3> N4, T1> T2> T3> T4, and H1> H2> H3> H4 are satisfied. That is, in the example shown in the table TB, as the stretch rate of the stretch film F increases, that is, the thickness of the stretch film F decreases, the temperature of the heating roller 82 decreases, and the pressing mechanism 70 presses the package W. Becomes smaller, and the time during which the holding mechanism 70 presses the article W to be packaged becomes shorter.

For example, when the elongation rate is 110%, the control unit 90 is configured such that the pressing mechanism 70 presses the object W to be packed N1 and the pressing mechanism 70 presses the object W as shown in FIG. The pressing time is set to T1, and the temperature of the heating roller 82 is set to H1. The control unit 90 controls each of the pressing mechanism 70 and the heating mechanism 80 based on the set values.

The control unit 90 refers to the product database DB2, and the temperature of the heating roller 82 with respect to the product G, the force with which the pressing mechanism 70 presses the package W, and the time for which the press mechanism 70 presses the package W. When the parameter regarding is set, the pressing mechanism 70 and the heating mechanism 80 are controlled in consideration of the setting. For example, even when the elongation rate is 110%, the control unit 90 uniformly uses a special setting (for example, a parameter when the elongation rate is 180%) in the product G (for example, crab). If there is a parameter added to the actual elongation by 50%, or the pressing mechanism 70 is not used), each value is set based on the setting, and each of the pressing mechanism 70 and the heating mechanism 80 is set. To control.

The control unit 90 does not operate the pressing mechanism 70 when the weight of the product G measured by the measuring instrument 12 is heavier than a predetermined threshold. In this case, the article to be packaged W comes into contact with the heating roller 82 only by its own weight. The predetermined threshold is set for each product G in the product database DB2.

The operation of the control unit 90 will be described with reference to FIG. FIG. 7 is a flowchart showing the operation of the control unit.

As shown in FIG. 7, the control unit 90 first controls the camera 15 to capture an image of the article W to be packaged placed on the weighing tray 11 (step S01). The control unit 90 acquires the size of the tray T based on the image captured by the camera 15 (step S02). Specifically, the control unit 90 refers to the tray database DB3 based on the image and acquires the size (shape) of the tray T.

Next, the control unit 90 acquires the product information of the packaged item W (step S03). Specifically, the control unit 90 acquires product information corresponding to the product (number) input by the operator using the display panel 94 or the operation key 95 from the product database DB2.

Subsequently, the control unit 90 acquires the elongation percentage of the stretch film F (step S04). When acquiring the elongation rate of the stretch film F, the control unit 90 sets the operations of the pressing mechanism 70 and the heating mechanism 80 based on the elongation rate (step S05). And the control part 90 controls various mechanisms, and performs the packaging operation | movement of the to-be-packaged goods W (step S06).

[Label printer]
The label printer 100 prints product information, the weight of the product G, the price, and the like on the label. The label printer 100 prints and outputs a label based on an instruction from the control unit 90.

[Label issuing machine]
The label issuing machine 110 attaches a label to the stretch film F packaged in the article to be packaged W. When the label issuing machine 110 receives the label output from the label printer 100, the label issuing machine 110 applies the label to the package W when the package W is being pushed out toward the discharge table 66 by the discharge pusher 65.

Subsequently, the operation of the packaging device 1 will be described with reference to FIGS. 8 to 10 are diagrams for explaining the operation of the packaging apparatus.

When the product is selected on the display panel 94 or the operation key 95 and the package W is placed on the weighing tray 11 as shown in FIG. 8A, the packaging device 1 measures the package W. While weighing with the container 12, the package W is imaged with the camera 15. The weighing-in mechanism 10 of the packaging device 1 conveys the article W to be lifted to the lifter mechanism 20 (see FIG. 8B).

Further, the stretch film F transferred from the film roll R to the film transport mechanism 50 by the film delivery mechanism 40 is cut by the cutting blade 58a of the cutter unit 58 to become a single rectangular stretch film F. It is carried by the both

feeder units

51 and 52 to above the mechanism 20. And above the lifter mechanism 20, the periphery of the stretch film F is strongly held by the operation of each clamp.

Then, the lifter mechanism 20 pushes up the product G and the tray T against the stretch film F in which the peripheral edge, particularly both sides are strongly held. As a result, the film F whose periphery is strongly held stretches so as to cover the top of the product G and the tray T (see FIG. 9A).

In this state, when the first folding plate 61, the second folding plate 62, and the third folding plate 63 move horizontally to the lower side of the tray T, a clamp other than the clamp on the front side (left side in FIG. 9) at an appropriate timing. Releases the holding of the film F, and the three sides of the peripheral edge of the film F are folded under the tray T. When the discharge pusher 65 pushes the tray T toward the discharge table 66, one side of the stretch film F on the front side that has not been folded hits the folding bar 64, and the tray T is moved in accordance with the movement of the tray T toward the discharge table 66. It is folded into the lower side (see FIG. 9B). The clamp on the front side is released from holding the stretch film F at this time. Further, during this movement, when the stretch film F folded under the tray T is heat sealed and discharged to the position shown in FIG. 9B, the stretch film F covers the product G and the entire tray T. The packaging is complete.

Furthermore, when processing including labeling is selected, the price, weight, etc. of the product G calculated based on the measured value are printed on the label by the label printer 100, and the label is packaged by the label issuing machine 110. Affixed to the finished product G and tray T. The article W to be packaged with the label attached is discharged to the discharge table 66 as shown in FIG. Thus, the packaging object 1 is stretch-wrapped by the packaging device 1.

As described above, in the packaging device 1 according to the present embodiment, the control unit 90 acquires the stretch rate of the stretch film F that has been stretched, and based on the stretch rate, the temperature of the heating roller 82 and the pressing mechanism 70. Changes the external force applied to the package W and the time during which the holding mechanism 70 applies the external force to the package W. Thereby, in the packaging apparatus 1, since control according to the elongation rate of the stretch film F becomes possible, for example, when the elongation rate of the stretch film F is high, the temperature of the heating roller 82 is lowered, or the article to be packaged The external force applied to W can be reduced. Therefore, since it can suppress that excessive force or heat is added to the stretch film F with low intensity | strength, it can suppress that the stretch film F is damaged. Therefore, in the packaging apparatus 1, even if it is a case where the to-be-packaged goods W of various shapes are packaged, damage to the stretch film F can be suppressed.

In this embodiment, the stretch rate of the stretch film F is set based on the dimensions of the stretch film F and the shape of the article to be packaged W. The stretch film F is generally wound in a roll shape, is fed out from the film roll R as much as it is used, stretched in one direction (width direction), and attached to the package. The stretch rate of the stretch film F increases as the shape of the packaged object W increases. Therefore, the elongation rate of the stretch film F can be set appropriately by setting the elongation rate based on the dimensions of the stretch film F and the shape of the article W to be packaged. Therefore, in the packaging device 1, it becomes possible to perform an appropriate process according to the elongation rate, and the breakage of the stretch film F can be further suppressed.

In the present embodiment, the control unit 90 includes the stretch rate of the stretch film F, the temperature of the heating roller 82 of the heating mechanism 80 at the stretch rate, the external force that the pressing mechanism 70 applies to the package W at the stretch rate, and The table TB in which the pressing mechanism 70 applies the external force to the package W at the elongation rate is associated with the heating roller 82 and the pressing mechanism 70 based on the acquired elongation rate and the table TB. To control. Thereby, the control according to the elongation rate of the stretch film F can be selected rapidly and correctly. Therefore, it is possible to improve the efficiency of processing in the control unit 90.

In the present embodiment, the article W to be packaged is a product T placed on the tray T. The packaging device 1 includes a storage unit 96 that stores product information regarding the product G. The control unit 90 controls the heating mechanism 80 and the pressing mechanism 70 based on the stretch rate of the stretch film F and the product information. By adding product information to the stretch rate of the stretch film F, processing according to the characteristics of the product G (for example, the shape, size, height, etc. of the product G) becomes possible. Therefore, the heat applied to the article to be packaged W (stretch film F) and the external force applied to the article to be packaged W can be set more appropriately.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the form in which the article W on which the commodity G is placed on the tray T is described as an example. However, the commodity G may be packaged without being accommodated in the tray T.

In the above-described embodiment, the pressure plate 73 and the pressure roller 74 of the pressure mechanism 70 are moved up and down, and the contact pressure between the heating roller 82 and the packaged material W against the packaged product W positioned on the heating roller 82. The external force is applied so that becomes large. However, the form in which the external force is applied so that the contact pressure between the heating roller 82 and the article W to be packaged is increased is not limited to this. For example, a mechanism in which the heating roller 82 moves up and down may be provided, and an external force may be applied to the package W by pushing up the heating roller 82. At this time, the pressing plate 73 and the pressing roller 74 may be maintained at a constant height or may be movable.

In the said embodiment, although the elongation rate of the stretch film F is set based on the width dimension of the stretch film F and the shape of the to-be-packaged object W, the elongation rate considers the height of the to-be-packaged object W. It may be set. That is, the elongation rate may be set based on at least one piece of information on the dimensions of the stretch film F, the shape of the packaged object W, and the height of the packaged object W.

Further, the elongation percentage may be set in advance depending on the type of stretch film F and the type of tray T, and may be acquired from a table associated with the type of stretch film F and the type of tray T. In this case, the elongation percentage can be acquired by selecting the type of the stretch film F.

DESCRIPTION OF SYMBOLS 1 ... Packaging apparatus, 70 ... Holding mechanism (external force provision part), 80 ... Heating mechanism (heating part), 90 ... Control part, 96 ... Memory | storage part, F ... Stretch film, G ... Goods, T ... Tray, W ... Cover Packaging.

Claims

A packaging device that covers an object to be packaged by a stretched film and wraps the film by overlapping the peripheral edge of the film on the lower side of the object to be packaged,
A heating section for heating the film located on the lower side of the article to be packaged;
An external force applying unit that applies an external force to the packaged object positioned on the heating unit so that a contact pressure between the heating unit and the packaged object is increased;
A control unit for controlling the temperature of the heating unit and the operation of the external force applying unit,
The control unit acquires the stretch rate of the stretched film, and based on the stretch rate, the temperature of the heating unit, the external force applied to the package by the external force applying unit, and the external force The packaging device in which the imparting unit changes at least one of the times during which the external force is imparted to the packaged object.
The packaging device according to claim 1, wherein the elongation percentage of the film is set based on at least one information of a dimension of the film, a shape of the packaged object, and a height of the packaged object.
The control unit includes the elongation rate of the film, the temperature of the heating unit at the elongation rate, the external force applied by the external force applying unit to the package in the elongation rate, and the elongation rate. The external force application unit has information associated with at least one of the times during which the external force is applied to the package,
The packaging device according to claim 1 or 2, wherein at least one of the heating unit and the external force applying unit is controlled based on the acquired elongation rate and the information.
The packaged item is a product placed on a tray,
A storage unit for storing product information related to the product;
The packaging device according to any one of claims 1 to 3, wherein the control unit controls at least one of the heating unit and the external force applying unit based on the elongation percentage of the film and the product information. .