JP4459539B2 - Packaging equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a packaging device, and more particularly, to a packaging device that pushes up a package from below and holds the peripheral edge of the film downward to the package.
[0002]
[Prior art]
  2. Description of the Related Art Conventionally, an apparatus that wraps an object to be packaged such as fresh food stored in a tray using foamed polystyrene with a stretch film is known as a stretch wrapping apparatus. In this stretch wrapping device, a stretch film having a predetermined width is cut into a predetermined length according to the size of the tray, and both side edges in the width direction of the film are held by a pair of feeders composed of upper and lower belts or the like. The film is then transported to the packaging station and film packaging is performed at the packaging station. At the packaging station, the peripheral portion of the film is pushed up with the product stored in the tray (hereinafter referred to as an object to be packaged) against the film that has been transported and held in tension, and the object to be packaged is in close contact with the film. Fold it under the package. Specifically, the left and right folding members fold the left and right parts of the peripheral edge of the film to the lower side of the package, the rear folding member folds the rear part of the peripheral edge of the film to the lower side of the package, Then, the object to be packaged is pushed forward by a pusher, and the front portion of the peripheral edge of the film is relatively folded to the lower side of the object to be packaged. Thus, after wrapping a packaged article with a stretch film, the film folded under the packaged article is heat-sealed to complete packaging.
[0003]
  Patent Document 1 discloses such a packaging apparatus in which a plurality of mounting members that support a package object are folded left and right and back and forth when the peripheral portion of the film is folded below the package object. ing. In the packaging machine described in Patent Document 1, the mounting member has a structure that rotates around two axes orthogonal to each other at the same height position. When the left and right portions of the peripheral portion of the film are folded to the lower side of the package, the mounting member falls in the left and right direction, and the rear portion of the peripheral portion of the film is folded to the lower side of the package. Sometimes it falls back and forth.
[0004]
[Patent Document 1]
        Japanese Examined Patent Publication No. 3-69769 (FIGS. 1, 3 and 4)
[0005]
[Problems to be solved by the invention]
  In the packaging apparatus as described above, it is desirable to securely support the tray so as not to be deformed even if it is a soft tray when pushing up an article to be packaged against the tension-held film. For this purpose, it is necessary to arrange a plurality of placement members on which the article to be packaged is placed with as little gap as possible.
[0006]
  However, when adopting a structure in which the mounting member tilts when the peripheral edge of the film is folded to the lower side of the article to be packaged, the mounting member does not interfere with the adjacent mounting member when tilted. It is necessary to leave some space. And in order to make this interval as small as possible, when the distance between the rotation center when the mounting member falls and the mounting surface (upper surface) of the mounting member is shortened, and the interval between the mounting members is small In addition, the design must be made so that the mounting members do not interfere with each other.
[0007]
  However, in the packaging machine of Patent Document 1, since the mounting member is tilted in the left-right direction and the front-rear direction around two axes at the same height position, the left-right folding member and the front-rear folding member Among them, the rotation radius of the mounting member when tilted by the one arranged on the upper side is relatively large. For this reason, the interval between the mounting members is not sufficiently small, and in the case of a soft package or a complex package, the package is deformed or the package is supported. There is a risk of becoming unstable.
[0008]
  An object of the present invention is a packaging device in which the peripheral edge of a film is folded in the left-right direction to the lower side of the packaged object and is folded in the front-rear direction to the lower side of the packaged object. It is to provide a packaging device in which a plurality of mounting members can be arranged densely and appropriate packaging is performed..
[0009]
[Means for Solving the Problems]
  A packaging device according to claim 1 is a packaging device that pushes up an object to be packaged from below onto a tension-held film and folds the peripheral edge of the film to the lower side of the object to be packaged. A member and a front-rear direction folding member are provided. A lift mechanism is a mechanism which raises / lowers an article to be packaged, and has a plurality of placement members on which the article to be packaged is placed. The left-right direction folding member enters the space between the packaging object and the mounting member in a state where the packaging object pushes up the film by the lift mechanism, and the peripheral edge of the film is folded in the lateral direction to the lower side of the packaging object. Make it. The front / rear direction folding member enters the space between the packaging object and the mounting member at a height position different from that of the left / right direction folding member in a state where the packaging object pushes up the film by the lift mechanism, and moves the front and rear edges of the film. Fold in the direction to the bottom of the package. At least some of the mounting members of the lift mechanism are tilted with the heads turning around the first axis (one left-right rotation axis) in response to the force from the left-right direction folding member. In response to the force from the front-rear direction folding member, the second shaft (one front-rear rotation shaft) located at a different height from the first shaft is rotated and tilted.The lift mechanism further includes a first spring that resists tilting about the first axis of the mounting member, and a second spring that resists tilting about the second axis of the mounting member. In the lift mechanism, a plurality of mounting members are arranged in three or more rows on the front and rear and three or more rows on the left and right. The left-right direction folding member is used to fold the peripheral edge of the film in the left-right direction to the lower side of the package before the front-rear direction folding member. Does not touch. The at least one mounting member in the left and right central row is set such that the spring strength of the second spring is stronger than the spring strength of the second spring of the mounting member other than the left and right central rows.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  A film transverse feed type stretch wrapping apparatus according to an embodiment of the present invention is shown in FIG. The packaging device 1 pushes up a product G such as a fresh food product placed on the tray T against the stretch film F held in tension (see FIGS. 10 and 11), and the peripheral portion of the film F is placed below the tray T. It is an apparatus for film-wrapping an article to be packaged consisting of a tray T and a product G by folding it into a box. In addition to the film packaging function, the packaging device 1 also has a weighing function and a pricing function by labeling.
[0011]
  <Overall outline of the device>
  As shown in FIGS. 1 and 2, the packaging device 1 includes a weighing-in mechanism 2, a packaging station 3, a roll support mechanism 4, a film delivery mechanism 5, a film transport mechanism 6, a folding mechanism 7, and a heating mechanism. And a mechanism 82.
[0012]
  The weighing-in mechanism 2 is provided at the front center of the main body 1a. The packaging station 3 is a space formed in the main body 1a. The roll support mechanism 4 is disposed on both sides of the main body 1a and holds the film roll R, respectively. The film delivery mechanism 5 delivers the film F drawn from the film roll R upward. The film transport mechanism 6 receives the film F from the film delivery mechanism 5 and transports the film F to the packaging station 3. The folding mechanism 7 wraps an object to be packaged by the film F conveyed to the packaging station 3. The heating mechanism 82 applies heat to the film F that is folded and overlapped on the lower side of the package by the folding mechanism 7 to perform heat sealing.
[0013]
  In addition, a control unit 9 including a computer having a display panel 94, operation keys 95, and the like is disposed on the main body 1a. The control unit 9 controls the operation of each mechanism described above, calculates the price of the product G based on a signal indicating the weight of the product G weighed by the weighing-in mechanism 2, and determines the weight of the product G. It controls the operation of the label printer 10 and the label issuing machine 11 for printing the price and the like on the label. The display panel 94 is a touch panel display, and operation buttons are also arranged on the panel. A storage unit 96 (see FIG. 8) is also stored in the computer, and the storage unit 96 relates to the film F input from the display panel 94, the operation keys 95, or the like, or transferred from an external device. Data and data related to the package are stored.
[0014]
  The film roll R used in the packaging device 1 is one in which stretch films F having a predetermined width dimension are wound in multiple layers.
[0015]
  <Weighing-in mechanism>
  Although not shown in the drawings, the weighing-in mechanism 2 includes a measuring device that measures the weight of a product G such as food stored in the tray T, and a plurality of loading belts stretched between a pair of rollers. Yes. The carry-in belt is provided with a conveying projection, and if the tray T containing the product G is placed on the weighing instrument (above the carry-in belt) as shown in FIG. After being weighed, the tray T is pushed by the protrusion of the carry-in belt and is sent onto the support bases 33a and 33b of the lift mechanism 30 (described later) of the packaging station 3 (see FIG. 10).
[0016]
  <Packaging station>
  The packaging station 3 is a space in the main body 1a where a series of film packaging processes are performed on the product G in the tray T that has been weighed. In the packaging station 3, the stretch film F is stretched by the film transport mechanism 6, and the lift mechanism 30 pushes up the tray T and the product G against the stretched film F (see FIG. 11). Then, by folding the peripheral portion of the film F to the lower side of the tray T in which the folding plates 76 to 78 and the front folding rod 79 of the folding mechanism 7 push up the film F, the tray T and the product G become the film F. It becomes the state covered with.
[0017]
  A lifting mechanism 30 for supporting the bottom surface of the tray T and moving the tray T and the product G upward is provided below the packaging station 3.
[0018]
    [Lift mechanism]
  As shown in FIGS. 3 to 5, the lift mechanism 30 mainly includes support bases 33 a and 33 b and a total of 33 placement members 311 to 314, 321 to 325 and 331 fixed on the support bases 33 a and 33 b. 335, 341 to 345, 351 to 355, 361 to 365, 371 to 374, and a rack and pinion mechanism 34 for moving the support bases 33a and 33b up and down. In the rack and pinion mechanism 34, the pinion fixed to the output shaft that outputs the rotation from the servo motor through the gear box moves the rack engaged with the pinion up and down. Thereby, the support base 33a fixed to the rack upper part moves up and down.
[0019]
  The two support bases 33a and 33b are arranged at the front and rear, and are connected when the large tray T is packaged, and are separated when the small tray T is packaged.
[0020]
  The mounting members 311 and the like have the same basic structure, although there is a difference that the spring strength of the front and rear springs 28 differs depending on the mounting members as will be described later. Here, the structure will be described using the mounting member 311 as an example.
[0021]
  As shown in FIGS. 6 and 7, the mounting member 311 mainly includes a head 21, a fixed post 22, a left / right rotation shaft 23, a front / rear rotation shaft 24, a left / right spring 27, and a front / rear spring 28. It is composed of
[0022]
  The upper surface of the head 21 is a mounting surface on which the tray T is mounted, and the head 21 can be turned back and forth and left and right with respect to the fixed post 22.
[0023]
  The fixed post 22 is disposed below the head 21, and the lower part is fixed to the support base 33a.
[0024]
  The left and right pivot shaft 23 is used to fix the head 21 to a fixed post so that the head 21 can pivot about 90 degrees in the left and right direction from the vertical state as indicated by a thick two-dot chain line arrow A1 in FIG. Axis 22 is supported.
[0025]
  The front / rear rotation shaft 24 is configured to fix the head 21 to the fixed post 22 so that the head 21 can be rotated about 90 degrees in the forward direction from the vertical state as indicated by a thick two-dot chain line arrow A2 in FIG. To support.
[0026]
  Therefore, the left / right rotation shaft 23 and the front / rear rotation shaft 24 are orthogonal to each other in a plane. Further, as shown in FIGS. 6 and 7, the center 23 a of the left / right rotation shaft 23 and the center 24 a of the front / rear rotation shaft 24 are displaced from each other by a dimension H. As will be described later, the head 21 receives the force from the left and right folding plates 76 and 77, rotates about the left and right rotation shaft 23, falls in the left and right direction, and receives the force from the rear folding plate 78 to move back and forth. It pivots about the pivot shaft 24 and falls forward. Here, since the center 23a of the left and right rotation shaft 23 and the center 24a of the front and rear rotation shaft 24 are arranged so as to be shifted in the height direction by the dimension H, the center of the left and right folding plates 76 and 77 in the height direction ( The height direction distance L1 between the center line 77a in FIG. 6 and the center 23a of the left and right rotation shaft 23 is the center in the height direction of the rear folding plate 78 (see the center line 78a in FIG. 7) and the front and rear rotation shaft. The value is close to the height direction distance L2 from the center 24a of 24. Since the left and right folding plates 76 and 77 and the rear folding plate 78 are arranged to be shifted in the height direction, the center 24a of the front / rear rotation shaft 24 is at the same height as the center 23a of the left / right rotation shaft 23. Then, the height direction distance between the center in the height direction of the back folding plate 78 and the center 24a of the front / rear rotation shaft 24 becomes larger than the distance L2 shown in FIG. The turning radius becomes large, and the placement members 311 and the like cannot be densely arranged in the front-rear direction. However, here, since the turning radius of the head 21 such as the mounting member 311 that is tilted forward is suppressed to a relatively small value, the arrangement interval in the front-rear direction of the mounting member 311 can be reduced. (See FIG. 5).
[0027]
  Since the head 21 can rotate about 90 degrees around the left and right rotation shaft 23 and the front and rear rotation shaft 24, the head 21 is inclined when receiving force from both the left and right and front and rear. Sometimes it falls. Specifically, a range indicated by a dotted line in FIG. 5 is a planar range in which the head 21 such as the mounting member 311 may fall down in the packaging apparatus 1.
[0028]
  However, since the mounting members 341 to 345 in the central row are in a range where the left and right folding plates 76 and 77 do not reach, in principle, they do not fall in the left-right direction, but fall only forward. However, if the weight balance is lost due to the placement position of the tray T and the central placement members 341 to 345 are tilted to the left and right, there is a possibility that a problem may occur in the packaging. In view of this, here, for the mounting members 341 to 345 at the center, a ring (not shown) that prevents the head 21 from falling to the left and right is mounted, so that the head 21 does not fall to the left and right only before. It has a structure that falls.
[0029]
  The left and right springs 27 shown in FIGS. 6 and 7 are springs that resist the rotation when the head 21 rotates in the left and right direction from the vertical state as shown by the two-dot chain line arrow A1 in FIG. is there. That is, the left and right springs 27 apply a spring force to return the head 21 to the vertical state shown by the solid line in FIG. 6 when the head 21 falls in the left and right direction. The left and right springs 27 are string-wound springs and are wound around the left and right rotation shafts 23.
[0030]
  The front and rear springs 28 shown in FIGS. 6 and 7 are springs that resist the rotation when the head 21 rotates forward from the vertical state as indicated by the thick two-dot chain line arrow A2 in FIG. . That is, the front / rear spring 28 applies a spring force to return the head 21 to the vertical state shown by the solid line in FIG. 7 when the head 21 falls forward. The front / rear spring 28 is a string-wound spring and is wound around the front / rear rotating shaft 24.
[0031]
  The spring strength of the left and right springs 27 is set to be stronger than the spring strength of the front and rear springs 28 in principle. That is, in principle, the head 21 receives a strong spring reaction force when it falls to the left and right, and receives a weak spring reaction force when it falls forward. However, for the five mounting members 341 to 345 in the center row (center row) in the left-right direction, the spring strength of the left and right springs 27 is the same as that of the other mounting members 311 and the like, but The spring strength is set to be stronger than the spring strength of the front and rear springs 28 of the other mounting members 311 and the like. Specifically, the spring strength of the front and rear springs 28 of the mounting members 341 to 345 in the center row is set to be stronger than the spring strength of the left and right springs 27 of the mounting members 311 and the like.
[0032]
  Note that the central row of mounting members 341 to 345 in which the spring strength of the front and rear springs 28 is set to be particularly strong supports the tray T even when the left and right folding plates 76 and 77 enter the lower side of the tray T. It will continue. The left and right folding plates 76 and 77 move only to the front of the placement members 341 to 345 in the central row (see FIGS. 16 and 17).
[0033]
  In summary, there are three types of springs used for the mounting members 311 and the like, and the front and rear springs 28 of the mounting members 341 to 345 in the center row have the strongest spring strength, and all the mounting members 311 and the like The left and right springs 27 have the next strongest spring strength, and the left and right springs 28 of three mounting members 311 to 314, 321 to 325, 331 to 335, 351 to 355, 361 to 365, and 371 to 374 are the most. Spring strength is weak.
[0034]
    [Pressing mechanism]
  Further, a holding mechanism (not shown) is provided at the upper part of the packaging station 3 and serves to prevent the tray T and the product G from falling their postures and falling when the tray T and the product G are pushed up by the lift mechanism 30 and stopped. ) Is arranged. This pressing mechanism presses the product G and the tray T against the heating roller 112 when the film F folded under the tray T is heat sealed by the heating roller 112 while the tray T is pushed out to the discharge table 83 by the discharge pusher 80. Also plays a role.
[0035]
  <Roll support mechanism>
  As shown in FIG. 2, the roll support mechanism 4 that supports the film roll R is provided approximately symmetrically on both sides of the main body 1a. The roll support mechanism 4 is mainly composed of a roll bar 4a.
[0036]
  The roll bar 4a allows the film roll R to be inserted and holds the film roll R with a holder or the like. Each roll bar 4a is rotatably supported by the main body 1a and is driven by one film roll drive motor 4b. The film roll drive motor 4b can be rotated forward and backward, and drives one roll support mechanism 4 during forward rotation and the other roll support mechanism 4 during reverse rotation.
[0037]
  <Film delivery mechanism>
  The film delivery mechanism 5 is a mechanism for delivering the film F drawn from the film roll R to a pair of feeder units 61 and 62 of the film transport mechanism 6 described later. As shown in FIG. 2, the film feed mechanism 5 mainly includes a feed roller 51, a feed motor 52 that rotates the feed roller 51, a film insertion plate unit 53, and a film insertion plate that moves the film insertion plate unit 53 up and down. And a drive motor 54.
[0038]
  The feeding roller 51 is a roller disposed obliquely above the film roll R held by the roll support mechanism 4 and outside the film roll R, and extends along the longitudinal direction of the film roll R. The feed roller 51 is connected to a feed motor 52 through a belt, and rotates by the operation of the feed motor 52.
[0039]
  The film insertion plate unit 53 is mainly composed of two plate members 57 and 58, and is disposed above the film roll R supported by the roll support mechanism 4 as shown in FIG. 2.
[0040]
  The film insertion plate drive motor 54 is provided to move the film insertion plate unit 53 up and down, and moves the film insertion plate unit 53 up and down via a link mechanism.
[0041]
  <Film transport mechanism>
  The film transport mechanism 6 receives the film F fed by the film delivery mechanism 5 from the film roll R, transports the film F to the central portion of the packaging station 3, and holds the film F in tension. The film transport mechanism 6 mainly includes a first feeder unit 61, a second feeder unit 62, a first feeder moving unit 63, a second feeder moving unit 64, and a feeder driving unit 65.
[0042]
  The first feeder unit 61 is disposed on the near side when viewed from the front of the apparatus 1, and the second feeder unit 62 is disposed on the other side when viewed from the front of the apparatus 1 (see FIGS. 3 and 4). These first and second feeder units 61 and 62 sandwich the front and rear side portions (front side and side portions on the front side) of the laterally fed film F with upper and lower belts, and operate the feeder drive unit 65 to operate the film. F is conveyed.
[0043]
  Further, the first feeder unit 61 is moved in the film width direction (left and right direction in FIGS. 3 and 4) by the operation of the first feeder moving unit 63 and the second feeder unit 62 is moved by the operation of the second feeder moving unit 64, respectively. Is configured to do. Each of the feeder units 61 and 62 is supported by two slide shafts 66 and 67 extending along the film width direction so as to be movable in the film width direction.
[0044]
  Although not shown in FIGS. 3 and 4, the first and second feeder units 61 and 62 have a plurality of clamps 61a and 62a (see FIGS. 14 to 17). These clamps 61a and 62a are actuated by solenoids to grip and release the film F. The clamps 61a and 62a mainly hold the front and rear ends of the film F at the initial stage when the peripheral edge of the film F is folded to the lower side of the tray T by the left and right folding plates 76 and 77 and the rear folding plate 78. (See FIGS. 14 and 15).
[0045]
    [Cutter mechanism]
  A cutter mechanism 69 is provided on the front side of the film transport mechanism 6 in the film transport direction. The cutter mechanism 69 cuts the film F between the mechanisms 5 and 6 after the film F transferred from the film delivery mechanism 5 to the film transport mechanism 6 is transported by a predetermined amount by the film transport mechanism 6. Is provided. The cutter mechanism 69 has a cutting blade 69a longer than the film width, and cuts the film F by moving the cutting blade 69a with an actuator.
[0046]
  The cutter mechanism 69 is also provided with two sets, one for when the film F is fed out from the film roll R on the front right side and one for when the film F is fed out from the film roll R on the left front side. (See FIG. 2).
[0047]
  <Folding mechanism>
  As shown in FIGS. 2 and 3, the folding mechanism 7 mainly includes left and right folding plates 76 and 77, a rear folding plate 78, a front folding rod 79, and a discharge pusher 80.
[0048]
  The left and right folding plates 76 and 77 fold the left and right portions of the periphery of the film F (the portions in the vicinity of both ends in the film conveyance direction) below the tray T, and are horizontally moved in the left and right directions by a motor and a timing belt (not shown). Is possible. Specifically, the left and right folding plates 76 and 77 enter between the tray T and the mounting member 311 and the like in a state where the lift mechanism 30 pushes up the package to the film F as shown in FIG. The peripheral edge of F is folded in the left-right direction to the lower side of the tray T.
[0049]
  The rear folding plate 78 folds the rear portion of the peripheral edge of the film F to the lower side of the tray T, and can be moved horizontally in the front-rear direction by a motor and a timing belt (not shown). The rear folding plate 78 is disposed above the left and right folding plates 76 and 77, and the film F can be folded below the tray T while overlapping the left and right folding plates 76 and 77 in plan view. Specifically, the rear folding plate 78 is located between the tray T and the mounting member 311 and the like at a position higher than the left and right folding plates 76 and 77 in a state where the lift mechanism 30 pushes up the packaging object to the film F. The peripheral edge of the film F is folded in the front-rear direction to the lower side of the tray T.
[0050]
  When the tray T is discharged by the discharge pusher 80 that pushes the tray T toward the discharge table 83, the front folding bar 79 has a front portion (a portion near the side on the first feeder unit 61 side) of the peripheral edge of the film F. It arrange | positions as shown in FIG.
[0051]
  As shown in FIG. 2, the discharge pusher 80 is divided into left and right parts so as not to interfere with the above-described pressing mechanism (not shown). The discharge pusher 80 can be moved horizontally in the front-rear direction by a motor and a timing belt (not shown). As will be described later, the discharge pusher 80 moves the tray T forward after the rear folding plate 78 folds the rear portion of the peripheral portion of the film F to the lower side of the tray T, so that the peripheral edge of the film F The front portion of the section is relatively folded to the lower side of the tray T by the front folding bar 79 (see FIGS. 12 and 13).
[0052]
  <Heating mechanism>
  As shown in FIG. 3, the heating mechanism 82 includes a heating roller 112 and conveying rollers before and after the heating roller 112.
[0053]
  <Control unit>
  The control unit 9 disposed on the upper part of the main body 1a is configured as shown in FIG. 8, and controls each operation of the mechanisms 2, 5, 6, 30, 7, 82, 10, and 11. The control unit 9 includes a CPU 91, a ROM 92, a RAM 93, a touch panel display panel 94, operation keys 95, and the like, and is connected to a storage unit 96 that stores various data. Inputs from the main power switch 16, the heater power switch 17, the emergency stop switch 18, and the like are also transmitted to the control unit 9.
[0054]
  The storage unit 96 stores a film data file 96a, a product data file 96b, and a tray data file 96c. In the film data file 96a, data relating to the properties of a plurality of types of films F is stored for each type of film F. In the product data file 96b, unit price data of the product G and data related to the properties of the product G are stored for each type of product G. In the tray data file 96c, data related to the properties of the tray T is stored for each type of tray T.
[0055]
  <Outline of operation of packaging device>
  Next, a schematic operation of the packaging apparatus 1 having the above configuration will be described.
[0056]
  In the apparatus 1, when the operator places the tray T containing the product G on the weighing instrument of the weighing-in mechanism 2, the loading belt starts moving after the weighing value is stabilized and the weighing is completed. The projection fixed to the carry-in belt moves according to the movement of the carry-in belt, and pushes out the tray T on which the product G is placed onto the placing member of the lift mechanism 30 (see FIGS. 9 and 10).
[0057]
  On the other hand, the film F transferred from the film roll R to the film transport mechanism 6 by the film delivery mechanism 5 is cut by the cutting blade 69a of the cutter mechanism 69 to become one rectangular film F, and the lift mechanism 30 It is carried by the both feeder units 61 and 62 to the upper side. Then, above the lift mechanism 30, the film F shown in FIG. 10 is in a state where the front and rear ends of the peripheral edge of the film F are strongly gripped by the operations of the clamps 61 a and 62 a.
[0058]
  And the lift mechanism 30 pushes up the goods G and the tray T with respect to the film F which was firmly hold | gripped the peripheral part, especially the front-and-back end in this way (refer FIG. 11). Then, the film F that is strongly held at the front and rear ends expands and covers the top of the product G and the tray T.
[0059]
  In this state, the left and right folding plates 76 and 77 and the rear folding plate 78 that starts to move subsequently move horizontally to the lower side of the tray T. And the clamp 62a of the 2nd feeder unit 62 cancels | releases holding | maintenance of the film F at an appropriate timing, and the right-and-left part and rear side part of the peripheral part of the film F are folded under the tray T. Subsequently, as shown in FIG. 12, when the discharge pusher 80 pushes the tray T toward the discharge table 83, the front portion (front portion) of the peripheral portion of the film F that has not been folded hits the front folding rod 79, As the tray T moves to the discharge table 83 side, it is folded into the lower side of the tray T. Note that the clamp 61a of the first feeder unit 61 releases the grip of the film F at this time. Further, during this movement, when the film F folded under the tray T is heat-sealed by the heating roller 112 and discharged to the position shown in FIG. 13, the film F covers the product G and the entire tray T and heats up. The sealed packaging is completed.
[0060]
  Furthermore, when processing including labeling is selected, the price or weight of the product calculated based on the measured value is printed on the label by the label printer 10 and the label is packaged by the label issuing machine 11 The product G and the tray T are attached.
[0061]
  <Details of folding operation of film peripheral edge under tray>
  Next, a film folding operation for folding the film F held by the clamps 61a and 62a of the first and second feeder units 61 and 62 to the lower side of the tray T will be described in detail with reference to FIGS. .
[0062]
  14A and 14B show a state in which the tray T is lifted above the rear folding plate 78 and the left and right folding plates 76 and 77 by the lift mechanism 30. FIG. FIG. 14A shows a state when viewed from the front, and FIG. 14B shows a state when viewed from the side. Here, the film F is stretched to some extent, and the product in the tray T is covered with the film F that is stretched.
[0063]
  When the tray T is lifted to the state shown in FIGS. 14A and 14B, the left and right folding plates 76 and 77 and the rear folding plate 78 move horizontally toward the space below the tray T. As described above, since the rear folding plate 78 is on the upper side of the left and right folding plates 76 and 77, the left and right folding plates 76 and 77 and the rear folding plate 78 are to enter the lower side of the tray T in a plane. Become.
[0064]
  Then, as shown in FIGS. 15A and 15B, the left and right folding plates 76 and 77 begin to push the film F toward the center, and then the rear folding plate 78 begins to push the film F forward. When the back folding plate 78 begins to push the film F forward, the second feeder unit 62 moves slightly forward as shown by the white arrow A11 in FIG. 15B, and excessive tension acts on the film F. To suppress.
[0065]
  Further, as shown in FIG. 15B, in the front-rear direction, the heads 21 of the mounting members 325, 335, 345, 355, and 365 on the rear side of the mounting member 311 and the like start to fall down. At this time, the clamp 62a of the second feeder unit 62 continues to grip the rear end of the film F, but the four mounting members among the five mounting members 325, 335, 345, 355, and 365 where the head 21 starts to fall. As for 325, 335, 355, 365, the spring strength of the front / rear spring 28 is weak, and the heads 21 of the mounting members 325, 335, 345, 355, 365 are tilted without large resistance as a whole. For this reason, the film F is strongly sandwiched between the rear folding plate 78 and the mounting members 325, 335, 345, 355, and 365, and excessive tension acts on the film F due to the movement of the rear folding plate 78 and the film F is torn. There are fewer problems.
[0066]
  Furthermore, as shown to Fig.15 (a), in the left-right direction, the head 21 of the mounting members 311 to 314, 321 to 325, 361 to 365, and 371 to 374 in two rows on the left and right outside starts to fall. The clamps 61a and 62a mainly grip the front and rear ends of the film F, and the left and right ends of the film F are hardly gripped, but here the mounting members 311 to 314, 321 to 325, Since the left and right springs 27 such as all the mounting members 311 including 361 to 365 and 371 to 374 have a relatively strong spring strength, the mounting members 311 to 314 and 321 to 325 contacting the film F while falling down. , 361 to 365 and 371 to 374 heads 21 restrain the film F relatively strongly. And since the left-right folding plates 76 and 77 advance inside in the state in which the mounting members 311 to 314, 321 to 325, 361 to 365, and 371 to 374 restrain the film F relatively strongly, the film F that covers the tray T Less tension and less appearance after packaging. That is, the mounting members 311 to 314, 321 to 325, 361 to 365, and 371 to 374 that restrain the film F relatively strongly while being in contact with the film F are not in the direction in which the tension of the film F is loosened. It affects the direction in which the tension of F is improved.
[0067]
  Next, when the left and right folding plates 76 and 77 and the rear folding plate 78 advance to a predetermined position, film gripping by the clamp 62a of the second feeder unit 62 is released. Thereafter, the left and right folding plates 76 and 77 and the rear folding plate 78 are further moved to shift to the state shown in FIG. 17 through the state shown in FIG. As shown in FIG. 17, when the rear folding plate 78 moves forward to the extent that the mounting member 341 at the front end of the center row is tilted, the discharge pusher 80 is indicated by a white arrow A <b> 12 in FIG. 17B. And the lift mechanism 30 starts to lower the support bases 33a and 33b to which the mounting member 311 and the like are fixed as shown by the white arrow A13 in FIG.
[0068]
  Thereafter, the rear folding plate 78 moves to the front end of the tray T, and the discharge pusher 80 pushes the tray T to the front discharge table 83 as described above (see FIG. 13).
[0069]
  <Characteristics of packaging apparatus of this embodiment>
  (1)
  In the packaging device 1, the left and right folding plates 76 and 77 and the rear folding plate 78 enter between the tray T of the package and the mounting member 311 at different height positions, and the peripheral portion of the film F is placed on the tray T. Fold it down. The plurality of placement members 311 and the like of the lift mechanism 30 on which the tray T is placed when the article to be packaged is pushed up with respect to the film F receive the force from the left and right folding plates 76 and 77 and the left and right rotation shafts 23 are centered. And tilted about the front-rear rotation shaft 24 by receiving a force from the rear folding plate 78.
[0070]
  Here, if the left and right pivot shaft 23 and the front and rear pivot shaft 24 are at the same height position, the left and right folding plates 76 and 77 and the rear folding plate 78 are at different height positions. It becomes difficult to set both the tilting radius of rotation about the rotation axis 23 and the rotation radius of tilting about the front-rear rotation axis 24 to be small.
[0071]
  However, in the packaging device 1, the height position of the left / right rotation shaft 23 and the height position of the front / rear rotation shaft 24 are different from each other. Both the tilting radius of rotation about the rotation axis 24 can be set small.
[0072]
  Specifically, as shown in FIGS. 6 and 7, the front / rear rotation shaft 24 is moved to the left / right rotation shaft in correspondence with the rear folding plate 78 positioned above the left / right folding plates 76, 77. 23 is positioned above 23. Therefore, the turning radius of the mounting member 311 and the like to the front of the head 21 is suppressed to a relatively small value, and the arrangement interval in the front-rear direction of the mounting member 311 and the like can be reduced.
[0073]
  (2)
  In the packaging device 1, the front and rear ends of the film F are mainly held by the plurality of clamps 61 a and 62 a of the first and second feeder units 61 and 62 rather than the left and right ends of the film F. Therefore, when the lift mechanism 30 pushes up the package to the film F, it is easy to secure the film tension in the front-rear direction, but it is difficult to ensure the film tension in the left-right direction.
[0074]
  However, in the packaging device 1, the left and right springs 27 that determine the difficulty of the head 21 such as the mounting member 311 to fall when tilted about the left and right rotation shaft 23 by the force from the left and right folding plates 76 and 77 are relatively springs. Since the strength of the film F that comes into contact with the head 21 such as the mounting member 311 is increased by the head 21 such as the mounting member 311, the left and right folding plates 76 and 77 hold the film F under the tray T. When the film F is folded to the side, the tension increases in such a manner that the film F is dragged by the head 21 such as the mounting member 311 and the left and right folding plates 76 and 77. Thereby, even if it is the packaging apparatus 1 in which the left and right end portions of the film F are hardly gripped, the tension in the left-right direction of the film F after packaging can be secured.
[0075]
  On the other hand, when the rear folding plate 78 starts to enter the lower side of the tray T and the head 21 of the mounting members 325, 335, 345, 355, 365 starts to fall down, the clamp 62 a of the second feeder unit 62 is moved to the rear end of the film F. However, since the spring strength of the front and rear springs 28 such as the mounting member 311 is set to be weak in principle, the mounting members 325, 335, 355, and 365 except for the special mounting member 345 are set. The head 21 falls down without great resistance. For this reason, the film F is strongly sandwiched between the rear folding plate 78 and the mounting members 325, 335, 345, 355, and 365, and excessive tension acts on the film F due to the movement of the rear folding plate 78 and the film F is torn. There are fewer problems.
[0076]
  As described above, in the packaging device 1, the left and right springs 27 that determine the difficulty of the head 21 such as the mounting member 311 to fall when tilted about the left and right rotation shaft 23 by the force from the left and right folding plates 76 and 77, The spring strength is changed by the front and rear springs 28 that determine the difficulty of the head 21 such as the mounting member 311 to fall when tilted about the front and rear rotation shaft 24 by the force from the rear folding plate 78. The difficulty of falling of the head 21 such as the mounting member 311 affects the degree of restraint by the head 21 of the mounting member 311 or the like of the film F that contacts the mounting member 311 or the like. The tension of the film F after packaging can be improved. And in the packaging apparatus 1, by setting appropriately the spring strength of the left and right spring 27 and the spring strength of the front and rear spring 28 individually, The tension of the film F in the left-right direction and the tension of the film F in the front-rear direction are both brought into an appropriate state.
[0077]
  (3)
  As described above, in the packaging apparatus 1, in principle, the spring strength of the front and rear springs 28 such as the mounting member 311 is set to be weaker than that of the left and right springs 27 to improve the tension of the left and right front and rear films F after packaging. I am trying. However, aiming at the following effects, the spring strength of the front and rear springs 28 is specially set stronger than that of the left and right springs 27 for the mounting members 341 to 345 in the center row.
[0078]
  In the packaging device 1, the placement members 341 to 345 in the central row maintain the state of supporting the tray T even after the left and right folding plates 76 and 77 enter the lower side of the tray T. When the rear folding plate 78 folds the film F to the lower side of the tray T, a force from the rear folding plate 78 is directly received and the mounting members 341 to 345 in the center row and some other mounting members are moved forward. In addition, the film F pulled by the rear folding plate 78 tilts forward while tilting part of the other mounting members to the left and right.
[0079]
  Here, with respect to the mounting members 341 to 345 in the center row, the spring strength of the front and rear springs 28 is made stronger than that of the other mounting members 311 and the like. For this reason, when the back folding plate 78 enters by the central rows of mounting members 341 to 345 having the strong front and rear springs 28 and supporting the tray T, the force is applied from the back folding plate 78 through the film F. It is suppressed that the position of the object greatly deviates back and forth.
[0080]
  Of course, since the front and rear springs 28 of the mounting members 341 to 345 in the central row are made strong in this way, the mounting member 341 is placed when the rear folding plate 78 enters the lower side of the tray T. Although the degree of restraint of the film F by the head 21 to 345 is slightly increased, the other placing members 311 and the like incorporate the front and rear springs 28 having relatively weak spring strength, so that the placing members without large resistance as a whole. The heads 21 of 325, 335, 345, 355 and 365 will fall. Therefore, even if the clamp 62a of the second feeder unit 62 holds the rear end of the film F, there is almost no problem that the film F is excessively increased and the film F is damaged.
[0081]
  <Modification of packaging apparatus of this embodiment>
  (A)
  Although the packaging device 1 is a film transverse feed type stretch packaging device, the present invention can also be applied to a stretch packaging device that targets film longitudinal feeding (front and back feeding) type fruits and vegetables.
[0082]
  (B)
  In the packaging device 1, as shown in FIGS. 6 and 7, the front / rear rotation shaft 24 is moved to the left / right rotation shaft 23 in accordance with the rear folding plate 78 being disposed above the left / right folding plates 76, 77. It is arranged on the upper side. However, when the present invention is applied to a packaging device in which the left and right folding plates are positioned above the rear folding plate, the left and right rotation shafts are arranged above the front and rear rotation shafts.
[0083]
  In this case, since the left and right folding plates are located above the rear folding plate, if the left and right rotation shafts and the front and rear rotation shafts are at the same height, the left and right rotation shafts are centered. It is assumed that the tilting radius of the tilt becomes unnecessarily large. However, by positioning the left / right rotation shaft above the front / rear rotation shaft, the tilting radius of rotation about the left / right rotation shaft becomes a relatively small size, and the horizontal distance between the mounting members is reduced. It will be possible to suppress.
[0084]
  (C)
  In the packaging device 1, the placing members 341 to 345 in the center row include the front and rear springs 28 having the same spring strength. However, the front and rear springs 28 of the placement members 341 to 345 in the center row may have different spring strengths.
[0085]
  For example, the mounting members 341 to 345 in the center row receive the force from the rear folding plate 78 in the order of the mounting member 345, the mounting member 344, the mounting member 343, the mounting member 342, and the mounting member 341. 21 falls down. As for the thing whose order of tilting is early, after the head 21 falls, it does not contribute to the suppression of the positional deviation of the package. In view of this, with regard to the mounting members 341 to 345, the spring strength of the front and rear spring 28 may be increased as the order in which the head 21 falls down is slower. Even in such a case, the mounting members 341 to 345 prevent the position of the packaged item from being greatly shifted back and forth, and the mounting member 345 and the like excessively restrain the film F when the rear folding plate 78 enters. To be suppressed. That is, the rear folding plate 78 places the rear end portion of the peripheral edge of the film F on the lower side of the tray T by providing an appropriate difference in the spring strength of the front and rear springs 28 of the mounting members 341 to 345 in the center row. It is possible to realize in a well-balanced manner the suppression of the forward displacement of the packaged object when folded and the suppression of excessive tension applied to the film F when the rear folding plate 78 enters the lower side of the tray T. .
[0086]
  (D)
  In the packaging device 1, the spring strength of the front and rear springs 28 is set to be strong for all the placing members 341 to 345 in the center row.
[0087]
  However, when the back folding plate 78 folds the rear end portion of the peripheral edge of the film F to the lower side of the tray T, the front folding of the package is suppressed, and the rear folding plate 78 enters the lower side of the tray T. Considering the balance with the suppression of excessive tension applied to the film F sometimes, for example, setting only the spring strength of the front and rear springs 28 of the mounting member 341 in the forefront of the center row, The remaining mounting members 311 including the mounting members 342 to 345 may be equipped with front and rear springs 28 having uniformly weak spring strength.
[0088]
  (E)
  In the packaging device 1, the spring strength of the front and rear springs 28 is set stronger than the other mounting members 311 and the like for the mounting members 341 to 345 in the central row. It is conceivable that the spring strength of the front and rear springs 28 is also set to be strong for some of the mounting members in the left and right rows located sideways.
[0089]
  (F)
  In the packaging apparatus 1, considering that the weight balance is lost due to the placement position of the tray T and the central placement members 341 to 345 are tilted to the left and right, there is a possibility that the packaging may be defective. About the mounting members 341-345, the ring which prevents the head 21 falling down to right and left is mounted | worn, and it is set as the structure where the head 21 does not fall down right and left, but only falls forward.
[0090]
  On the other hand, if the manufacturing cost does not increase greatly, the central mounting members 341 to 345 are configured to be completely different from the other mounting members 311 and the like, so that they do not fall physically to the left and right and fall only forward. It is also possible to do. At this time, the central mounting members 341 to 345 may be provided with a pair of rotating shafts and springs.
[0091]
【The invention's effect】
  In the present invention,It becomes easy to arrange a plurality of mounting members densely and perform appropriate packaging..
[Brief description of the drawings]
FIG. 1 is an external perspective view of a packaging device according to an embodiment of the present invention.
FIG. 2 is a schematic front view of the inside of the packaging apparatus.
FIG. 3 is a schematic view taken along the line III-III in FIG. 2;
4 is a schematic view taken along arrows IV-IV in FIG. 3;
FIG. 5 is a layout diagram of lift heads of a lift mechanism.
FIG. 6 is a front view of a mounting member.
FIG. 7 is a side view of the mounting member.
FIG. 8 is a block configuration diagram of a control unit.
FIG. 9 is an operation explanatory diagram of the packaging device.
FIG. 10 is an operation explanatory diagram of the packaging device.
FIG. 11 is an operation explanatory diagram of the packaging device.
FIG. 12 is an operation explanatory diagram of the packaging device.
FIG. 13 is an operation explanatory view of the packaging device.
FIG. 14 is an explanatory diagram of a folding operation.
FIG. 15 is an explanatory diagram of a folding operation.
FIG. 16 is an explanatory diagram of a folding operation.
FIG. 17 is an explanatory diagram of a folding operation.
[Explanation of symbols]
    1 Packaging equipment
  21 heads
  22 fixed post
  23 Left and right pivot (first axis)
  24 Axial axis (second axis)
  27 Left and right springs (first spring)
  28 Front and rear springs (second spring)
  30 Lift mechanism
  61a, 62a Clamp (gripping mechanism)
  76, 77 Left and right folding plates (left and right folding members)
  78 Back folding plate (back and forth direction folding member)
311 to 314 Left and right rows of mounting members
321 to 325 Left and right rows of mounting members
331 to 335 Left and right rows of mounting members
341 to 345 Placement members in central row
351-355 Left and right rows of mounting members
361-365 Left and right rows of mounting members
371 to 374 Left and right rows of mounting members
    F film
    T tray (packaged items)
    G Product (packaged item)

Claims (2)

A packaging device that pushes up an object to be wrapped from below on a tension-held film and folds the peripheral edge of the film to the lower side of the object to be wrapped,
A plurality of mounting members on which the article to be packaged is placed, and a lift mechanism for raising and lowering the article to be packaged;
In a state in which the packaged object pushes up the film by the lift mechanism, the packaged object enters between the packaged object and the mounting member, and a peripheral edge portion of the film extends in the left-right direction below the packaged object. A left-right direction folding member to be folded,
In the state where the packaged object pushes up the film by the lift mechanism, it enters between the packaged object and the mounting member at a height position different from that of the left-right direction folding member, and the peripheral portion of the film is A front-rear direction folding member that is folded in the front-rear direction to the lower side of the article to be packaged,
With
At least some of the mounting members described above, the head receives a force from the left-right direction folding member, tilts around a first axis that is one left-right rotation axis, and tilts, In response to the force from the front-rear direction folding member, it tilts around a second axis that is one front-rear rotation axis at a height position different from the first axis ,
The lift mechanism further includes a first spring that resists tilting the mounting member about the first axis, and a second spring that resists tilting the mounting member about the second axis. Have
In the lift mechanism, a plurality of the mounting members are arranged in three or more rows on the front and rear, and three or more rows on the left and right.
The left-right direction folding member is configured to fold the peripheral edge of the film in the left-right direction to the lower side of the packaged object before the front-rear direction folding member. Without touching the mounting member,
At least one of the placement members in the left and right center rows is set such that the spring strength of the second spring is stronger than the spring strength of the second springs of the placement members other than the left and right center rows. ,
Packaging equipment. At least a plurality of the placement members in the left and right central rows are set such that the spring strength of the second springs is stronger than the spring strength of the second springs of the placement members other than the left and right central rows. The second spring has a stronger spring strength as the head is slowed down in response to the force from the front-rear folding member,
The packaging device according to claim 1 .

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