JP3189989U - Packaging equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new wrapping device capable of appropriately wrapping a film having high elasticity without being entangled with a mounting member. SOLUTION: A packaging device 1 pushes up an object to be packaged on a tension-holding film F from below and folds a peripheral edge portion of the film F into the lower surface of the object to be packaged. A lift mechanism 30 for pushing up an object is provided, and a plurality of mounting members for supporting the object to be packaged are provided on the upper portion of the lift mechanism 30. Then, after the object to be packaged pushes up the film F by the lift mechanism 30, the folding members 76 to 78 enter between the object to be packaged and the above-mentioned placing member, and the peripheral edge portion of the film F is folded into the lower surface of the object to be packaged. However, a member for preventing a collision between the released film peripheral edge portion and the previously described placing member is provided on the side portion of the previously described placing member. This prevents the open peripheral edge of the film from being entangled with the mounting member. [Selection diagram] FIG. 9

Description

  The present invention relates to a wrapping apparatus that pushes up an object to be wrapped from below on a stretch film held in tension and folds the peripheral edge of the film onto the lower surface of the object to be wrapped.

  This type of wrapping apparatus cuts stretch film into dimensions according to the size of the tray and then transports it to a wrapping station where the film is tensioned and held, and then the package is pushed up from below the film to wrap the film. Although it covers, the lift mechanism described in the following patent document is known as a lifting device used at that time.

  The lift mechanism is provided at a terminal portion of the carry-in mechanism for carrying the article to be packaged into the packaging device, and places the article to be packaged received from the carry-in mechanism on a plurality of placement members and pushes it up to the packaging station. And in the state which pushed up the film hold | maintained tension | tensile_strength with the to-be-packaged object, a folding member approachs from the front and back, right and left between a to-be-packaged object and a mounting member, and folds a film. At that time, the placing member is pushed down by the entering folding member, but at a predetermined timing, the tension-held film is released and folded into the lower surface of the package.

JP 2004-262513 A

  By the way, recently, a stretch film rich in elasticity has come to be used. When it is released in the stretched state, the reaction force causes the film open end to collide with the placement member that has been pushed down and placed. There was a case of being caught on the member. When the folding member further enters in this state, there is a problem that the film is torn and falls into a packaging defect, and a piece of the film entangled with the mounting member is mixed into the package and causes foreign matter to be mixed.

  To solve this problem, there is a method of roughening the surface of the mounting member with a file to reduce the contact area with the film, but this method lacks permanence, so it must be periodically filed. There is a problem that must not be.

  This invention is developed in view of such a problem, and it is providing the new packaging apparatus which can be packaged appropriately, without being entangled in a mounting member, even when the film which is rich in a stretching property is used. .

  A packaging apparatus according to the present invention is a packaging apparatus that pushes up an object to be packaged from below onto a tensioned film, and folds the peripheral edge of the film into the lower surface of the object to be packaged. A lift mechanism that has a plurality of placement members and pushes up the package toward the film held in tension, and in the state where the package pushes up the film by the lift mechanism, A folding member that enters between the members and folds the peripheral portion of the film into the lower surface of the packaged object, and the released film peripheral portion and the above-described placement portion on the side portion of the placement member of the lift mechanism. A member for preventing a collision with the member is provided.

  When the film held in tension is folded into the lower surface of the package, the film held in tension is released at a predetermined timing after the folding member enters while pushing down the placing member. In that case, a film peripheral part contracts vigorously toward the mounting member pushed down. However, the side of the mounting member is provided with a member that prevents the shrinking film from colliding, and the film is opened to block the collision between the contracting film peripheral edge and the pushed-down mounting member. The peripheral edge is smoothly folded into the lower surface of the package without being entangled with the placement member.

  According to the present invention, even if a stretch film rich in stretchability is used, it is prevented from being entangled with the mounting member, so that appropriate packaging can always be performed regardless of the type of stretch film. Therefore, even if a stretch film rich in stretchability is used, problems such as film breakage and accompanying foreign matter can be eliminated.

1 is an external perspective view of a packaging device according to an embodiment of the present invention. The front schematic diagram inside a packaging apparatus. FIG. 3 is a schematic view taken along the line III-III in FIG. 2. FIG. 4 is a schematic view taken along arrows IV-IV in FIG. 3. The lift head arrangement drawing of a lift mechanism. The front view of a mounting member. The side view of a mounting member. The block diagram of the configuration of the control unit. Operation | movement explanatory drawing of a packaging apparatus. Operation | movement explanatory drawing of a packaging apparatus. Operation | movement explanatory drawing of a packaging apparatus. Operation | movement explanatory drawing of a packaging apparatus. Operation | movement explanatory drawing of a packaging apparatus. Folding operation explanatory diagram. Folding operation explanatory diagram. Folding operation explanatory diagram. Folding operation explanatory diagram.

  A film transverse feed type stretch wrapping apparatus according to an embodiment of the present invention is shown in FIG. This packaging apparatus 1 pushes up the product G such as fresh foods placed on the tray T against the stretch film held in tension (see FIGS. 10 and 11), and then the peripheral edge of the film is placed below the tray T. This is a packaging device that wraps an article to be packaged consisting of a tray T and a product G with a film. In addition to the film wrapping function, the wrapping apparatus 1 also has a labeling function for sticking a weighing function and a priced label to an article to be packaged.

<Overall configuration of device>
As shown in FIGS. 1 and 2, the packaging apparatus 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.
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 it to the packaging station 3. The folding mechanism 7 folds the film F conveyed to the packaging station 3 on the lower surface of the packaged object. The heating mechanism 82 heats and heat seals the film F folded on the lower surface of the package by the folding mechanism 7.

In addition, a control unit 9 including a display panel 94, operation keys 95, and the like is disposed on the main body 1a. The control unit 9 is equipped with a computer, controls the operation of each of the above mechanisms, and issues a label printer 10 that issues a pricing label based on the weight of the product G measured by the weighing-in mechanism 2. The label sticking machine 11 for sticking the label to the packaged article is controlled. The display panel 94 is a touch panel display, and operation buttons and various messages are displayed on the panel. The computer of the control unit 9 stores a storage unit 96 (see FIG. 8). The storage unit 96 includes film-related data and product-related data input from the display panel 94, operation keys 95, and the like. Is remembered.
The film roll R used in the packaging apparatus 1 is a roll of a stretch film F having a predetermined width dimension, and the film can be used without limitation from a high stretch rate to a low stretch rate. It has become.

<Measuring and loading mechanism>
Although not shown, the weighing-in mechanism 2 includes a transport belt that transports the product G stored in the tray T, and a weighing device that measures the weight of the product G. The conveyor belt is provided with a projection that pushes the side of the tray T. If the tray T containing the product G is placed on the measuring instrument (see FIG. 9), the weight of the product G is measured by the measuring instrument. When the weighing is completed, the tray T is pushed by the protrusion of the transport belt and is fed onto the support bases 33a and 33b of the lift mechanism 30 of the packaging station 3 (see FIG. 10).

<Packaging station>
The packaging station 3 is a space in the main body 1a for performing a series of film packaging processes on the tray T that has been weighed and the product G stored therein (collectively referred to as packaged items). In the packaging station 3, the stretch film F is stretched in advance by the film transport mechanism 6, and the lift mechanism 30 pushes up the packaged object against the stretched film F (see FIG. 11). And the to-be packaged object is covered with the film F by folding the peripheral edge of the film F into the lower surface of the tray T in the state where the folding plates 76 to 78 and the front folding rod 79 of the folding mechanism 7 push up the film F. It becomes. Therefore, a lift mechanism 30 that supports the lower surface of the tray T and moves an object to be packaged upward is provided below the packaging station 3.

<Lift mechanism>
As shown in FIGS. 3 to 5, the lift mechanism 30 includes front and rear 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 that moves the support bases 33a and 33b up and down. The rack and pinion mechanism 34 moves the rack in which the pinion fixed to the rotation shaft of the servo motor via the gear box meshes with the pinion in the vertical direction. As a result, the support base 33a fixed to the upper part of the rack moves up and down.

The two support bases 33a and 33b are arranged at the front and rear, the front and rear are connected when packaging a large tray T, and the front and rear support bases 33a are separated when packaging a small tray T. It is designed to move up and down.
(Members that prevent collisions)
Moreover, the member P which prevents the collision of the film F is attached to the both sides of the left-right direction of the front side support base 33a (refer FIG. 4, 5). When the film F having a high expansion / contraction ratio is used, the member P tries to collide with the side surfaces of the mounting members 311 to 313 and 371 to 373 vigorously by releasing the tension-maintained film F. However, it acts to prevent it. Therefore, this member P is set to a length that covers the mounting members 311 to 313 and 371 to 373 located on both sides and a height size that does not interfere with the left and right folding plates 76 and 77. Thereby, the peripheral part of the film F held in tension is prevented from being caught or tangled on the side surfaces of the mounting members 311 to 313 and 371 to 373 with the released force.

(Mounting member)
As described later, the mounting members 311 to 374 have the same basic structure, although there is a difference that the repulsive force of the front-rear spring 28 differs depending on the mounting member. Here, the structure will be described using the mounting member 311 as an example. Here, the side with the weighing-in mechanism 2 is the front side, and the side with the lift mechanism 30 is the rear side.
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
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.

The fixed post 22 is disposed below the head 21, and the lower part is fixed to the support base 33a.
As shown by the two-dot chain line arrow A1 in FIG. 6, the left-right rotation shaft 23 is used to fix the head 21 to the fixed post 22 so that the head 21 can rotate about 90 degrees in the left-right direction from the vertical state. Is pivotally supported.

As shown by an arrow A2 in FIG. 7, the front / rear rotation shaft 24 is supported by the fixed post 22 so that the head 21 can be rotated about 90 degrees in the forward direction from the vertical state. Yes.
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 rotate forward and backward. It turns around the moving 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 which 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).

  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, in FIG. 5, a range indicated by a dotted line is a planar range in which the head 21 such as the mounting member 311 may fall down in the packaging apparatus 1.

  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. Therefore, the center mounting members 341 to 345 are provided with a ring (not shown) that prevents the head 21 from falling to the left and right so that the head 21 does not fall to the left and right but only falls forward.

  The left and right springs 27 shown in FIGS. 6 and 7 are springs that resist rotation when the head 21 rotates in the left and right direction from the vertical state, as indicated by a two-dot chain line arrow A1 in FIG. . That is, the left and right springs 27 exert a spring force so as to return the head 21 to the vertical state indicated 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.

  The front and rear springs 28 shown in FIGS. 6 and 7 are springs that resist rotation when the head 21 is rotated forward from the vertical state as indicated by a 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.

  The repulsive force of the left and right springs 27 is set to be stronger than the repulsive force of the front and rear springs 28 in principle. That is, in principle, the head 21 receives a strong repulsive force when it falls to the left and right, and receives a weak repulsive 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 placement members 311. 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.

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).
In summary, there are three types of springs used for the mounting members 311 and the like, the front and rear springs 28 of the mounting members 341 to 345 in the center row are the strongest, and the left and right springs 27 of all the mounting members 311 and the like. The front and rear springs 28 of the three mounting members 311 to 314, 321 to 325, 331 to 335, 351 to 355, 361 to 365, and 371 to 374 are the weakest springs.

(Holding mechanism)
In addition, a pressing mechanism (not shown) that prevents an object to be package pushed up by the lift mechanism 30 from falling its posture and falling down is disposed above the packaging station 3. The pressing mechanism serves to press the object to be packed against the heating roller 112 when the film F folded on the lower surface of the tray T is heat-sealed by the heating roller 112 while the tray T is pushed out to the discharging table 83 by the discharging pusher 80. Fulfill.

<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.
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 roll drive motor 4b. The roll drive motor 4b can rotate forward and backward, and drives one roll support mechanism 4 during forward rotation, and drives the other roll support mechanism 4 during reverse rotation.

<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 motor 52 that drives 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.

  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.

The film insertion plate unit 53 includes 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.
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.

<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 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.

  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 sides (front side and side sides) of the laterally fed film F with upper and lower belts, and the feeder drive unit 65 is operated to operate the film. F is conveyed.

  Further, the first feeder unit 61 is operated by the operation of the first feeder moving unit 63, and the second feeder unit 62 is operated by the operation of the second feeder moving unit 64, respectively. ) Is configured to move. 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.

  Although not shown in FIGS. 3 and 4, the first and second feeder units 61 and 62 have a plurality of clamps 61 a and 62 a (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 into the lower surface 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).

(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.

The cutter mechanism 69 is also provided with two sets, one that operates when the film F is fed out from the film roll R on the front right side and the one that operates when the film F is fed out from the film roll R on the left front side. (See FIG. 2).
<Folding mechanism>
As shown in FIGS. 2 and 3, the folding mechanism 7 includes left and right folding plates 76 and 77, a rear folding plate 78, a front folding rod 79, and a discharge pusher 80.

  The left and right folding plates 76 and 77 fold the left and right portions of the peripheral edge of the film F (the portions in the vicinity of both ends in the film transport direction) into the lower surface of the tray T, and can be moved horizontally in the left and right directions by a motor and timing belt (not shown). It is. 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 surface of the tray T.

  The rear folding plate 78 folds the rear side portion of the peripheral edge of the film F into the lower surface 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 packaged object to the film F. The peripheral edge of the film F is folded in the front-rear direction to the lower surface of the tray T.

When the front folding bar 79 pushes out the tray T toward the discharge table 83 by the discharge pusher 80, the front portion of the peripheral portion of the film F (the portion near the side portion on the first feeder unit 61 side) is placed on the lower surface of the tray T. It arrange | positions as shown in FIG. 3 so that it may be folded.
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 into the lower surface of the tray T, so that the peripheral portion of the film F The front side portion of the tray is relatively folded into the lower surface of the tray T by the front folding rod 79 (see FIGS. 12 and 13).

<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.
<Control unit>
FIG. 8 is a block diagram showing the configuration of the control unit 9 arranged at the upper part of the main body 1a. In this figure, the control unit 9 controls the mechanisms 2, 5, 6, 30, 7, 82, 10, and 11. The CPU 91, the ROM 92, the RAM 93, the touch panel display panel 94, the operation keys 95, etc. And a storage unit 96 for storing various data, a main power switch 16, a heater power switch 17, an emergency stop switch 18, and the like.

  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 on 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, data relating to a tray size and a serving height that matches the product G, and the like are stored for each type of product G. In the tray data file 96c, data relating to the size of the tray T, timing data for folding the film F, and timing data for opening the film T are stored for each type of the tray T.

<Outline of operation of packaging device>
Next, a schematic operation of the packaging apparatus 1 having the above configuration will be described.
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 conveyor belt starts moving after the weighing value is stabilized and the weighing is completed. The protrusion fixed to the conveyor belt moves according to the movement of the conveyor belt, and pushes out the tray T on which the product G is placed onto the placement member of the lift mechanism 30 (see FIGS. 9 and 10).

  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 It is carried by both feeder units 61 and 62 to above 30. Then, above the lift mechanism 30, the film F shown in FIG. 10 is in a state in which the front and rear ends of the peripheral edge of the film F are strongly gripped by the operation of the clamps 61a and 62a.

And the lift mechanism 30 pushes up the goods G and the tray T with respect to the film F with which the peripheral part, especially the front-and-rear end was hold | gripped strongly (refer FIG. 11). Then, the film F with the front and rear ends strongly gripped extends to cover the top of the product G and the tray T.
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 a suitable timing, and the left-right part and the rear part of the peripheral part of the film F are folded in the lower surface of 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, the tray T is folded into the lower side. Note that the clamp 61a of the first feeder unit 61 releases the grip of the film F at this time. Further, when the film F folded under the tray T during this movement is heat-sealed by the heating roller 112 and discharged to the position shown in FIG. 13, the film F covers the entire tray T including the product G and heats it. Sealed to complete packaging.

  Furthermore, when processing including label sticking is selected, the price and weight of the product calculated based on the measured value are printed on the label by the label printer 10, and the label is packaged by the label sticking machine 11. Affixed on the packaged item.

<Details of folding operation of film peripheral edge to tray lower surface>
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 into the lower surface of the tray T will be described in detail with reference to FIGS.

  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.

  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.

  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 starts to push the film F forward, the second feeder unit 62 moves slightly forward as shown by an arrow A11 in FIG. 15B, and excessive tension acts on the film F. suppress.

  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 four of the five mounting members 325, 335, 345, 355, and 365 where the head 21 starts to fall. Regarding the mounting members 325, 335, 355, and 365, the spring strength of the front and rear springs 28 is weak, and the heads 21 of the mounting members 325, 335, 345, 355, and 365 are tilted without a 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. Such a problem disappears.

  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 hold the front and rear ends of the film F, and the left and right ends of the film F are hardly held, but here the mounting members 311 to 314 and 321 to start the head 21 to fall down. Since the left and right springs 27 such as all the mounting members 311 including 325, 361 to 365 and 371 to 374 have a relatively strong spring strength, the mounting members 311 to 314 and 321 contacting the film F while falling down. The heads 21 to 325, 361 to 365, and 371 to 374 restrain the film F relatively strongly. And in the state which the mounting members 311 to 314, 321 to 325, 361 to 365, and 371 to 374 restrain the film F relatively strongly, the left and right folding plates 76 and 77 move inward, so the film F covering the tray T It is less likely that the tension of the bag will loosen and become unsightly 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.

  Next, when the left and right folding plates 76 and 77 and the rear folding plate 78 advance to predetermined positions, the film gripping by the clamp 62a of the second feeder unit 62 is released. Then, although the peripheral part of the stretched film F contracts vigorously, there is a member P that prevents the collision, so that the outside of the member P is not touched without touching the placed mounting members 311 to 313 and 371 to 373. Stop on. 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 it pushes down the mounting member 341 at the front end of the center row, the discharge pusher 80 moves forward as indicated by an arrow A <b> 12 in FIG. At the same time, the lift mechanism 30 starts to lower the support bases 33a and 33b to which the placement member 311 and the like are fixed as shown by an arrow A13 in FIG.

  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).

<Modification of this embodiment>
In this embodiment, the collision preventing member P is attached to both the left and right sides of the front support base 33a. However, if necessary, it can be similarly attached to both the left and right sides of the rear support base 33b. Further, since the peripheral edge of the opened film F gets over the member P and is folded into the lower surface of the tray T, it is preferable to make the corners and edges of the preventing member P round as much as possible so as to be slippery. . Moreover, although this prevention member P is shape | molded with metal property, it can also form with a synthetic resin.
Furthermore, although the packaging apparatus 1 of this embodiment was a film transverse feed type stretch packaging apparatus, the present invention is directed to a film longitudinal feed (front and back feed) type fruit and vegetable, etc. Can be applied as well.
Moreover, in this embodiment, although the film roll R was arrange | positioned at both right and left sides, it can also be only one side as needed.

1 Packing device 30 Lift mechanism 76 Left and right folding plates (left and right folding members)
77 Left and right folding plates (left and right folding members)
311 to 314 Left and right side placement members 371 to 374 Left and right side placement members F Film T Tray (package)
G Product (packaged item)
P Member to prevent collision

Claims (1)

  A packaging device that pushes up an object to be wrapped from below onto a tension-held film and folds the peripheral edge of the film into the lower surface of the object to be wrapped, and has a plurality of placement members on which the object to be wrapped is placed A lift mechanism that pushes up the package toward the film held in tension, and in a state in which the package pushes up the film by the lift mechanism, the package enters the space between the package and the mounting member. A folding member that folds the peripheral edge of the film into the lower surface of the package, and a member that prevents a collision between the released film peripheral edge and the mounting member on the side of the mounting member. Is provided.

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