JP5071066B2 - Packaging equipment - Google Patents

Description

  The present invention relates to a packaging apparatus, and more particularly to a packaging apparatus that wraps an object to be packaged with a film, folds the peripheral edge of the film into the bottom surface of the object to be packaged, and heats the folded portion to seal the bottom.

2. Description of the Related Art A stretch packaging machine that accommodates food (meat, fish, sugar beet, etc.) in a synthetic resin tray and wraps the tray with a stretch film is generally known (for example, see Patent Document 1).
And in this stretch wrapping machine, when heat-sealing the peripheral portion of the film folded on the bottom side of the package, the weight of the package, the size of the package (tray), and the stretch amount of the film Due to the difference, the heat seal state varies, and there is a problem that stable heat sealing cannot be performed.
For this reason, for products that have been packaged and the heat seal at the bottom seal part is incomplete, the worker applies heat to the seal part and re-seals it, resulting in poor work efficiency. have.

JP 2001-97544 A

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is a film folded on the bottom side of the packaged object according to the weight and size of the packaged object. An object of the present invention is to provide a packaging device that can reliably heat-seal the peripheral edge of the packaging.

The technical means taken by the present invention in order to achieve the above object is a packaging device that covers the top surface of a packaged article with a film and folds the peripheral edge of the film to the bottom side of the packaged object to heat-seal. Acquisition means for acquiring data such as the weight and size of the package, heating means for heat sealing the film folded on the bottom side of the package, and the weight and / or size of the package Accordingly, a heating time control means for controlling the heating time of the film by the heating means is provided (claim 1).
As the acquisition means, for example, a method of measuring and acquiring with a sensor or the like during the process of transporting an article to be packed to the elevator of the packaging machine, and calling and acquiring from a preset data stored in advance by a product number or the like Methods and the like.
In the case of the method of measuring the packaged object and obtaining the weight, size, etc., the measuring means for measuring the weight and / or size of the packaged object, and the weight and size data of the packaged object measured by the measuring means Storage means for storing.
The measuring means is, for example, a measuring instrument that measures the weight of the packaged article, a measurement sensor that measures the width, height, and depth dimensions of the packaged object, and the measuring instrument conveys the packaged article to the elevator. It is installed in the mounting part of the to-be-packaged object arrange | positioned at the starting end side. Further, the measurement sensor for measuring the size of the packaged object (tray) enables the packaged object to be measured during conveyance to the elevator.

  The heating time control means is a system for controlling the heating time of the heating means according to the weight of the packaged object, or a system for controlling the heating time of the heating means according to the size data of the packaged object, and further the packaging Examples include a method of controlling the heating time of the heating means according to the weight and size data of the object, and a corresponding control method is selected according to the data of the packaged object.

  According to the above means, the heat sealing of the folded portion of the film that wraps the package is ensured by changing the heating time by the heating means according to the weight or size of the package, and both the weight and size data. Can be done.

The heating time control means includes setting means for setting the heating time for each part of the package , and the setting means moves the discharge pusher for each movement section of the discharge pusher corresponding to each part of the package. Can be set according to the weight and / or size of the package, and the movement of the discharge pusher is controlled based on the set data, and the film folded into the lower surface of the package It controls the heating time.
By part of the packaged object means, for example, a part with a large number of laminated film peripheral parts folded to the bottom side of the packaged object, or a part with a small number, and the heating time is set for each part.
The heating time may be set for each package according to only the weight data of the package, only the size data, and both the weight and size data.

  According to the above means, the weight data and the size data of the packaged object can be used to identify the important heating part (the part with a large number of laminated films) and the normal heating part in the packaged object, and heat can be efficiently and accurately based on that. Can be sealed. In addition, it is possible to perform heat sealing suitable for the case where sufficient pressure is obtained with respect to the film which is folded and laminated by the weight (self-weight) of the package, and when the pressure cannot be obtained sufficiently, and stable heat sealing is possible. Is possible.

The control of the heating time by the heating time control means may control the time required for the package to pass over the heating means, but controls the speed at which the package is passed over the heating means. (Claim 2 ).

  According to the above means, the heating time is not directly controlled by the time, but the packaging object is kept within the range of the heating means by controlling the speed when the packaging object passes over the heating means. This eliminates the need for packaging efficiency.

The heating means may be capable of varying the temperature, but may be set to a constant temperature in advance (Claim 3 ).
In this case, since the temperature of the heating means is kept constant, there is no need to perform temperature control of the heating means, which is difficult to control temperature rise and temperature fall in a short time, and work can be performed easily.

According to the structure of the present invention, the packaging apparatus of the present invention is a film for packaging an object to be packaged by changing the heating time by the heating means in accordance with the weight or size of the object to be packaged, and further both the weight and size data. It is possible to reliably perform heat sealing of the folded portion.
In addition, it is possible to know the important heating part (the part where the number of laminated films is large) in the package, and based on this, it is possible to heat-seal efficiently and accurately, so that the heat-sealing is ensured while preventing the film from melting. Yes.

Moreover, according to the structure of Claim 2, it becomes unnecessary to keep a to-be-packaged object in the range of a heating means, and can improve packaging efficiency.
Further, according to the configuration of the third aspect, it is not necessary to control the temperature of the heating means which is difficult to control the temperature rise and temperature drop in a short time, and the work can be performed easily.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described based on drawings with respect to a weighing / packaging device incorporating a labeling device.
FIG. 1 is a schematic diagram showing the entire weighing and packaging price device, A is a stretch film packaging machine, B is a label issuing unit (measuring label printer), and C is a package that receives a label issued from the label issuing unit B. The label issuing unit B is attached to a finished packaged object, the label issuing unit B is disposed on the side upper part of the heat seal unit (discharge path) 10 of the packaged product in the stretch film packaging machine A, and the label applying unit C is It is arranged above the discharge path.

In the stretch wrapping machine A, a product placing part 13 for placing the article to be packaged G is arranged in front of the machine frame 14, and the article to be packaged G placed on the product placing part 13 is placed inside the machine frame by the pusher conveyor 1. To the elevator 2 provided in In addition, the case where the to-be-packaged goods G are conveyed in the state accommodated in the tray which is a container is illustrated, and the goods mounting part 13 is comprised as a weighing pan of the measurement part 15, and this goods mounting part A width detection sensor 17a for detecting the lateral width of the product G is provided in the vicinity of the 13 front side.
Further, in the middle of the product conveyance path by the pusher conveyor 1, a height detection sensor 17 b that is positioned on the side of the conveyor 1 to detect the height of the product, and the product placement unit 13 and the height detection sensor. The length detection sensor 17c which measures the depth dimension (length dimension along a conveyance direction) of the to-be-packaged object G between 17b is provided.
A wrapping section 3 is provided above the elevator 2, a film roll 4 is set on the side of the wrapping section 3 (a direction perpendicular to the pusher conveyor), and a film 4 ′ fed out from the film roll 4 is placed. It is pulled out by the film feed mechanism 5 and cut to a predetermined length and then transferred to the packaging unit 3.

In the packaging part 3, the rear folding member 6 and the left and right folding members 7, 7 are folded above the film feed mechanism 5 at the end of the film 4 ′ covering the upper surface of the packaged goods G to the bottom side of the packaged goods G. ', A discharge pusher 8 for discharging the packaged article G' positioned above the right and left folding members 7 and 7 ', and a front folding roller 9 is disposed at a position forward of the discharge pusher 8 in the moving direction. Yes.
The film feed mechanism 5 includes a pair of upper and lower endless elastic belts 5a and 5b that sandwich a side end in the width direction of the film, and a clamp plate 5c that presses the lower elastic belt 5b toward the upper elastic belt 5a. They are arranged on the front and back with the packaging part 3 in between.

  Further, in front of the front folding roller 9, a heat seal portion (discharge path) 10 that heats, bonds, and discharges the overlapping portion of the end portion of the film folded on the bottom surface side of the article to be packaged G and the front portion thereof. Discharging means 11 is disposed, a console section 12 is provided on the machine casing 14, and a label issuing section (weighing label printer) B is disposed on the side upper portion of the heat seal section (discharge path) 10. A label sticking device C is installed above the (road) 10.

  The heat seal part (discharge path) 10 is wound around an endless belt 10c made of glass fiber or the like so as to be rotatable over pulleys 10a and 10b, and is a lower part of a conveying surface (outward side belt) of the endless belt 10c. The hot plate 10d is arranged on the top. The hot plate 10d is electrically heated and becomes a heat source of the heat seal part. Further, the hot plate 10d is heated and held at a constant temperature, and the temperature of the hot plate 10d is not increased or decreased each time when the end of the film for packaging the article to be packaged G is heat sealed. The endless belt 10c is heated to a temperature at which the entire belt can be heat sealed.

In the stretch wrapping machine A configured as described above, the article G to be packaged conveyed on the elevator 2 is pushed up against the film 4 ′ stretched on the packaging unit 3 by the elevation of the elevator 2, and the upper surface of the article G to be packaged is The end of the covered film 4 ′ is folded to the bottom surface side of the package G by the rear folding member 6 and the left and right folding members 7, 7 ′.
Next, the front end portion of the film 4 ′ is pushed by the front folding roller 9 while horizontally pushing the package G toward the heat seal portion (discharge path) 10 by the discharge pusher 8. Folded to the side and the overlapping part of the film end folded to the bottom side is heat-sealed by a heat seal part (discharge path) 10 to obtain a packaged object G ′ wrapped with a film.

  The label issuing unit B uses the unit price set in advance based on the data measured by placing the article to be packaged G on the weighing pan 15 of the product placing unit 13 of the stretch wrapping machine A. The price is calculated, and the price and other product data are printed and issued on label paper. This label issuing section B issues a label L that is printed and held substantially horizontally with the printing surface facing up. A mouth 16 is provided.

  The label sticking device C includes a label suction unit C1 that sucks a label held in the label issuing port 16, a drive mechanism C2 that moves the label suction unit C1, and a control unit that controls the operation of the drive mechanism C2. It consists of Since the label issuing unit B and the label sticking device C are not directly related to the present invention, detailed description thereof is omitted.

FIG. 2 is a block diagram showing the electrical configuration of the apparatus described above, and includes a label issuing unit (measurement label printer) control unit D and a packaging mechanism control unit E.
The label issuing unit (measurement label printer) control unit D mainly controls the label issuing unit and is controlled by the CPU 18. In addition, about the control regarding the label sticking apparatus C, it abbreviate | omits.
The packaging mechanism control unit E mainly controls the mechanism unit of the stretch packaging machine A, and is controlled by the CPU.

The label issuing unit control unit D will be described. The CPU 18 includes a ROM 19 and a RAM 20, a display operation unit (console unit 12) 21, a weighing unit 22, a communication interface circuit (INF) 23, a printing unit 24, A tray detection sensor 25 is connected, and various control programs executed by the CPU 18 are stored in the ROM 19.
The RAM 20 includes areas such as various registers and flags that are used when the CPU 18 executes the control program of the ROM 19 and a preset data area in which various data is stored in advance for each product.
In the preset data area, a product file (Fig. 1), "product name", "unit price", "barcode", etc., which are data for price calculation and label printing, corresponding to the packaged item (product number) G (Fig. 3), a tray file (see FIG. 4), and the like are stored. Details of each file will be described later.

The display operation unit (console unit 12) 21 includes an operation unit including a keyboard and a touch panel, and a display unit configured by a liquid crystal display. Input data based on input of various data and commands or commands of the CPU 18 Display, preset data display, and various messages. Therefore, the data regarding the size of the packaged goods G (tray) in the present invention can be input by operating the operation unit of the display operation unit 12.
The weighing unit 22 supplies a weighing signal of the article G to be packaged placed on the product placing unit 13 to the CPU 18.
The communication interface circuit (INF) 23 is a circuit for communicating various data and commands with the packaging mechanism control unit E.
The printing unit 24 is a label issuing unit (weighing label printer) B, which has a thermal printer, prints the product name, price, unit price, bar code, etc. on the label based on a command from the CPU 18, and prints the printed label on the label issuing port. 16 is issued.

  The tray detection sensor 25 is disposed on the side of the heat seal portion (discharge path) 10 and at the entrance of the carry-in object G ′, and the tray detection sensor 25 is packaged in the heat seal portion 10. When it is detected that G ′ has been carried in, a signal is sent from the CPU 18 to the CPU 26, and the CPU 26 controls the discharge pusher drive motor 36.

Next, the packaging mechanism control unit E will be described. A communication interface circuit (INF) 27, a ROM 28, a RAM 29, an operation unit 30, and a mechanism drive unit 31 are connected to the CPU 26 via a bus 26a.
The communication interface circuit (INF) 27 is a circuit for communicating various data and commands with the label issuing unit control unit D described above.
The ROM 28 stores a control program executed by the CPU 26.
The RAM 29 has various registers and flag areas used when the CPU 26 executes the control program of the ROM 28, and various tables for determining control data based on product shape data (vertical, horizontal, and height). Is remembered.
The operation unit 30 is a switch for starting and stopping the apparatus.

The mechanism drive unit 31 is a circuit for driving each mechanism unit of the packaging machine when packaging is performed. Specifically, the motor 32 that drives the elevator 2 and the pusher conveyor 1 that carries the article to be packaged G are carried in. There are a motor 33, a film transfer motor 34 of the film feed mechanism 5, and the like. Although the structure of the packaging machine has been briefly described above, since it is not directly related to the present invention, the details of the control of the motor will be omitted.
In addition, the mechanism driving unit 31 includes a width detection sensor 17a that detects the width of the package (tray) G, a height detection sensor 17b that detects the height of the package G, and the conveyance of the package G. The length detection sensor 17c that measures the depth dimension along the direction, the folding plate drive motor 35 that drives the rear folding member 6 and the left and right folding members 7, 7 ', and the folding of the left and right and rear film ends are finished. A discharge pusher drive motor 36 for driving the discharge pusher 8 for pressing and transferring the packaged object in the direction of the heat seal portion 10 is connected to supply detection data of the detection sensors 17a to 17c to the CPU 26. .

  FIG. 3 shows an outline of the product file stored in the preset data area, and PLU No. “Product name”, “Unit price”, “Bar code”, “Label No. to be used” and the like are assigned with the key. The product file may be linked to a tray file (see FIG. 4).

  FIG. 4 shows an outline of the tray file. The tare weight, the width, the length, and the height of the tray, and the cut length of the film used to wrap the package using the tray are set for each. Data relating to the size of the tray is input from the display / operation unit (console unit 12) 21 or the packaged item (tray) G is lifted by the pusher conveyor 1 when the packaged item (tray) is placed on the placing unit 13. In the process of transporting onto the second head, the width, length and height of the article to be packaged G are detected by the width detection sensor 17a, the length detection sensor 17c and the height detection sensor 17b. Various packaging conditions are determined according to the detected tray size.

The folding operation of the film for wrapping the packaged goods G by the stretch wrapping machine is such that the packaged object is pushed up by the elevator with respect to the film stretched on the packaging unit 3 so that the upper surface of the packaged article is covered with the film. The peripheral edge of the film hangs downward from the bottom surface of the package.
And as shown in the film folding explanatory view of FIG. 5 (a), the peripheral edge of the film that hangs downward from the bottom surface of the packaged object is as follows. (1) First, the left and right film members 7 and 7 ' The end portion is folded on the bottom side of the article to be packaged, and (2) the rear folding member 6 folds the rear film end portion on the left and right film end portions that have been folded first. (3) Finally, the front film end is folded on the rear film end that is first folded by the front folding roller. As a result, the folded portion X of the front film end portion that is folded lastly overlaps the left and right end portions and the rear end portion that have been folded before that, and the number of stacked layers is the largest. As described above, although a slight difference occurs in the laminated state of the film formed by folding the film, the laminated portion of the film is efficiently heat-sealed by the heat seal portion (discharge path) 10. The folded portion X at the front film end is determined in advance for each tray size by a test or the like, and is the same as the distance of areas [b, b ′, b ″] described later.

Then, folding of the front film end portion and heat sealing of the folded film laminated portion are performed by the packaged object being pushed by the discharge pusher 8. The tray moving section by the discharge pusher is as shown in FIG.
Hereinafter, taking Tray No. A as an example, in the tray movement section by the carry-out pusher, the packaged object (tray) G ′ that has been packed is pushed by the discharge pusher, the heat seal is completed, and is discharged. Until then, it is divided into three areas [a], [b], and [c]. The moving speeds of the three areas are set in the tray-specific discharge pusher speed file (see FIG. 6).

The tray-specific discharge pusher speed file is set for each tray size, and controls the movement (speed) of the discharge pusher 8. In this control, when the folded portion X in the folded state of the film shown in FIG. 5 passes through the heat seal portion 10, the area [b] moves the discharge pusher 8 slowly (moving speed: V1). To do. The areas [a] and [c] are moved faster than the movement speed V1 of the area [b] (movement speed: V2, where V2> V1).
The area average (mm) bh is an average value of the areas (mm) b, b ′, b ″ in each tray and is a constant. Further, three types A, B, and C are registered as tray numbers. However, the present invention is not limited to this, and more tray numbers can be registered.

Hereinafter, a heat sealing control method will be described.
The heat seal control method is as follows: (1) a method for controlling the heat seal condition based on the measurement (weight) value of the packaged goods G, and (2) a heat seal based on the measurement (weight) value and size data of the packaged goods. There are a method for controlling the conditions, and (3) a method for controlling the heat sealing conditions based on the size data of the articles to be packaged (tray).
The method of controlling the heat sealing condition based on the measured (weight) value of the packaged goods G is performed by referring to the discharge pusher speed file by weight (FIG. 9) based on the weight of the packaged goods.
The discharge pusher speed file classified by weight is controlled by changing the speed of the discharge pusher depending on whether the weight of the packaged goods G is less than a certain value (M) or more than a certain value (M). That is, when the speed is less than a certain value (M), the speed is V1, and when it is more than the certain value (M), the speed is V2 (where V2> V1).
When the weight of the article to be packaged is less than a certain value (M), the film is overlapped because the article to be packaged cannot obtain a sufficient weight to press the end of the film folded on the bottom side. In the portion, the degree of adhesion of the film becomes low, and it takes extra time for the heat of the heat seal portion 10 to be transmitted from the surface layer to the deep layer. That is, since it takes time to heat-seal, control is performed so that the speed at which the article to be packaged passes through the heat-seal portion is slow.

Next, an outline of the operation of the packaging apparatus in the case of (1) in which the movement speed of the discharge pusher 8 is controlled with reference to only the weight value of the package will be briefly described based on the flowchart of FIG.
(S101) An operator inputs a product number (PLU No) of a package to be processed from the display operation unit (console unit) 12, and calls a preset product file.
(S102) When the operator places the article to be packaged on the placement part 13, the weighing object is measured by the weighing part integrated with the placement part, and when the weighing is stabilized (finished), the packaging operation (the article to be packaged) Loading) is started. The measured value is transmitted to the packaging mechanism control unit E.
(S103) The label issuing unit control unit D calculates the price of the packaged goods G from the unit price set in the product file and the measured value.
(S104) The width, length, and height of the package G are detected by the detection sensors 17a to 17c when the package is placed and transported to the elevator head, and the detection data is the label issuing unit controller D. Sent to.
(S105) It is determined whether size data of the package is preset in the product file called in S101.
(S106) If the size data of the package is preset, the size of the package measured in S104 is invalidated and the preset size data is validated.
(S107) If the size data of the package is not preset, the size data of the package measured in S104 is validated.
(S108) The tray file (FIG. 4) is referred to based on the weight, width, length, and height data of the article G to be packaged, and various packaging conditions such as film cut length necessary for packaging are determined. The package G is packaged based on the data.
(S109) It is determined whether the measurement (weight) value of the article to be packaged G is less than a certain value (M). If YES, the process proceeds to S110, and if NO, the process proceeds to S111.
(S110) The discharge pusher speed file classified by weight (FIG. 9) is referred to, and the discharge pusher drive motor 36 is controlled so that the moving speed of the discharge pusher 8 becomes V1 (mm / s) to heat the package G ′. Push to pass through the seal 10.
(S111) The discharge pusher speed file classified by weight (FIG. 9) is referred to, and the discharge pusher drive motor 36 is controlled so that the moving speed of the discharge pusher 8 becomes V2 (mm / s), and the package G ′ is heated. Push to pass through the seal 10.
(S112) When the packaging object G ′ after packaging is discharged to a predetermined position, a label is attached.

Next, an outline of the operation of the packaging device in the case of (2) in which the moving speed of the discharge pusher 8 is controlled based on the measurement value and size data of the package will be briefly described based on the flowchart of FIG. This control is executed by the CPU 26 of the packaging mechanism control unit E.
(S201) Based on the tray size data input from the measurement or display operation unit (console unit), the tray file (FIG. 4) is referred to and the tray number is determined.
(S202) It is determined whether the weighing (weight) value of the article to be packaged G weighed by the weighing unit is less than a certain value (M). If YES, the process proceeds to S204, and if NO, the process proceeds to S203.
(S203) With reference to the discharge pusher speed file by weight (FIG. 9), the discharge pusher drive motor 36 is controlled so that the moving speed of the discharge pusher 8 becomes V2 (mm / s), and the packaged goods G ′ are heated. Push to pass through the seal 10.
(S204) The discharge pusher speed file for each tray (FIG. 6) is referred to, and the moving speed (mm / s) and the section (mm) are determined by the tray No. Hereinafter, in this embodiment, tray no. A will be described as an example. The discharge pusher drive motor 36 is controlled so that the moving speed of the discharge pusher 8 becomes V2 (mm / s), and the article G ′ is pushed in the section [a] at a speed of V2 (mm / s). The area [a] will be described with reference to FIG. 5B. The distance S from the position where the discharge pusher 8 starts to move to the heat seal portion 10 is determined at the time of design, and measurement or input is performed from the distance S. The distance remaining after subtracting the length dimension N of the packaged goods (tray) G is the distance of the section [a]. The movement distance of the discharge pusher 8 is calculated based on the rotation signal of the discharge pusher drive motor 36 (S205). When the discharge pusher 8 moves by the distance of the section [a], the discharge pusher speed file for each tray (FIG. 6). , The discharge pusher drive motor 36 is controlled so that the moving speed of the discharge pusher 8 becomes V1 (mm / s) in the section [b], and the article to be packaged G ′ is pushed.
This section [b] is a folded portion X in which the peripheral edge of the film that wraps the packaged object is folded and overlapped with the bottom surface side of the packaged object, and heat is not easily transmitted to the entire film, so this section [b] Then, the speed of pushing the article to be packaged G ′ is slowed down and the heating time is lengthened to make the heat sealing more reliable. Refer to FIG. 5 for the section [b].
(S206) The discharge pusher speed file for each tray (FIG. 6) is referred to, and the discharge pusher drive motor 36 is controlled when the discharge pusher 8 has moved the distance of the section [b] (folding portion X), and the remaining strokes. The article to be packaged G ′ is pushed at a speed of V2 (mm / s) for the distance in the section [c]. For the interval [c], see FIG.
(S207) The packaged object G ′ that has passed through the heat seal portion 10 is pushed to the discharge means 11 to complete the heat seal.

  Regarding the operation of the packaging device in the case of (3) in which the movement speed of the discharge pusher 8 is controlled based on the size data of the package (tray) (S202) in the flowchart (see FIG. 8) of the control method in (2) above. , (S203) is the same flow as the remaining steps in which the step is deleted, and thus the description is omitted.

Next, an outline of the operation of the packaging apparatus when the moving speed of the discharge pusher 8 is controlled for each part only by the measured value (weight) of the package will be described based on the flowchart of FIG. This control is executed by the CPU 26 of the packaging mechanism control unit E.
(S301) The operator inputs the product number (PLU No) of the package to be processed from the display operation unit (console unit) 12, and calls a preset product file (product data).
(S302) It is determined whether the weighing (weight) value of the article to be packaged G weighed by the weighing unit is less than a certain value (M). If yes, then continue with S304, otherwise continue with S303.
(S303) With reference to the discharge pusher speed file by weight (FIG. 9), the discharge pusher drive motor 36 is controlled so that the moving speed of the discharge pusher 8 becomes V2 (mm / s), and the packaged goods G ′ are heated. Push to pass through the seal 10.
(S304) The discharge pusher drive motor 36 is controlled so that the moving speed of the discharge pusher 8 becomes V2 (mm / s), and the package G 'is pushed.
(S305) By controlling the discharge pusher drive motor 36 so that the moving speed of the discharge pusher 8 becomes V1 (mm / s) when the tray detection sensor 25 detects the article to be packaged G ', the discharge pusher speed file for each tray is controlled. The area [b] average (mm) in (FIG. 6) is referred to, and the packaged item G ′ is moved by a distance of bh. The moving distance of the discharge pusher 8 is calculated based on the rotation signal of the discharge pusher drive motor 36.
(S306) When the article G ′ to be packaged is moved by the distance bh at the movement speed V1 (mm / s), the discharge pusher drive motor 36 is set so that the movement speed of the discharge pusher 8 becomes V2 (mm / s). Control and push the package G ′ at a speed of V2 (mm / s).
(S307) The packaged article G ′ that has passed through the heat seal part 10 is pushed to the discharge means 11 to complete the heat seal.

The present invention is not limited to the above-described embodiment, and can be changed without changing the gist of the present invention.
( 1 ) The heat seal control of the film end folded into the bottom side of the packaged object is not limited to the heat seal that heats the packaged article while moving, but the heat seal part has a constant heating temperature. You may make it control by the time which stops a to-be-packaged item on top, or may control by the heating temperature of a heat seal part.
( 2 ) Although the size of the package (tray) is detected using a sensor, the package is photographed with a camera during conveyance until the package is supplied to the elevator, and the image is taken. You may process and detect size.
( 3 ) Although the discharge pusher speeds are two types, V1 and V2, many kinds of speeds such as high speed, medium speed, low speed, and ultra-low speed are set so as to correspond to a film that is difficult to heat seal. Good.
( 4 ) The area to be controlled for heating is not limited to the direction along the transport direction, but may be set in a two-dimensional manner extending in the direction (width direction) orthogonal to the transport direction. That is, a temperature difference is partially given to the heating temperature of the hot plate constituting the heat seal part.
( 5 ) Even when a heat seal is started, a sensor for detecting that the front end of the packaged article has reached the end point position of the section [a] (start position of the section [b] or the heat seal portion) may be provided. Good.

Schematic which shows an example of implementation of the packaging apparatus which concerns on this invention. The block diagram which shows the electric constitution of the packaging apparatus. Explanatory drawing which shows the structure of a goods file. Explanatory drawing which shows the structure of a tray file. (A) is explanatory drawing which shows the folding state of a film edge part, (b) is explanatory drawing which shows the movement area of the to-be packaged object by a discharge pusher. Explanatory drawing which shows the structure of the discharge pusher speed file classified by tray. The flowchart which shows the control method which heat-seals by the measurement (weight) value of a to-be-packaged item. The flowchart which shows the control method which heat-seals with the measurement (weight) value and size data of a to-be-packaged item. Explanatory drawing which shows the structure of the discharge pusher speed file classified by weight. The flowchart which shows the control method which heats and heat-seals according to a part only by the measurement (weight) value of a to-be-packaged object.

Explanation of symbols

A ... Stretch film packaging machine G, G '... Packed object 10 ... Heat seal part (heating means) 15 ... Measuring part (acquisition means)
17a: Width detection sensor (acquisition means) 17b: Height detection sensor (acquisition means)
17c ... Length detection sensor (acquisition means) 29 ... RAM (acquisition means)
E ... Packing mechanism controller

Claims (3)

A packaging device that covers the top surface of the packaged object with a film, folds the peripheral edge of the film onto the bottom side of the packaged product, and heat-seals the packaged object by pressing the heating means on the heating means ,
An acquisition means for acquiring the weight and / or size of the package;
Heating means for heat-sealing the film folded on the bottom side of the packaged article;
A heating time control means for controlling the heating time of the film by the heating means according to the weight and / or size of the article to be packaged ,
The heating time control means includes a setting means capable of setting a heating time for each part of the packaged object,
The setting means can set data for controlling the movement of the discharge pusher for each movement section of the discharge pusher corresponding to each part of the packaged object according to the weight and / or size of the packaged object,
A packaging apparatus, wherein the movement of the discharge pusher is controlled based on the set data to control the heating time of the film folded on the lower surface of the packaged object.   2. The packaging apparatus according to claim 1, wherein the heating time is controlled by the heating time control means by controlling a speed at which an article to be packaged passes over the heating means.   The packaging apparatus according to claim 2, wherein the heating means is maintained at a preset constant temperature.

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