JP2018002157A - Packing device having film folding-in mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate defective packing by preventing vertical flapping of a downstream side folding-in margin of a tray for storing a packing object.SOLUTION: A pair of second side conveyors are arranged for carrying a tray T covered with a tubular film 49 cut by a film cutter, and an endless conveyor 79 having a wide pulling-in opening part for pulling in an upstream side folding-in margin of the tubular film by suction, is arranged in a lower part between a pair of these conveyors, and a suction chamber for sucking the upstream side folding-in margin is arranged on the inside of the endless conveyor, and in the endless conveyor, a plurality of rods are installed in parallel between the endless chains, and an upstream side edge part of the rod fills up a clearance by projecting in the clearance direction between the adjacent rods, and a support surface 66 of an upper surface of the rod is flatly formed, and is sandwiched by the flat support surface of the endless conveyor and a bottom surface of the tray so that a downstream side folding-in margin 51 does not ripple.SELECTED DRAWING: Figure 7

Description

In the present invention, a packaged article is stored in a tray and wrapped in a tube shape with a belt-like film, and then cut at both ends of the tube-shaped film with a folding margin, and the folding margin at both ends is trayed. It is related with the packaging apparatus provided with the film folding mechanism folded into the bottom face of.

FIG. 15 is a front sectional view of the packaging device of Patent Document 1. As shown in FIG. 15, suction pipes 13 and 14 are respectively provided before and after a cutting mechanism 12 including a lower blade 10 and an upper reverse groove type blade receiver 11, and in particular, a downstream suction pipe 14. A chain rotating body 15 is supported around a plurality of wheels and is arranged around each of the shafts, and a large number of bar members 16, 16.

A large number of trays T, T... Covered with the tubular film F are sandwiched by endless belts from both sides and are conveyed in the longitudinal direction by the rotation of these belts. When the tubular film F is cut between the trays T and T by descending as described above, the upstream and downstream folding margins F2 and F1 of the tubular film F are sucked into the suction pipes 14 and 13, respectively. The downstream folding allowance F1 is bent by the conveying force of the tray T, and the upstream folding allowance F2 is bent to the bottom surface of the tray T by the chain rotating body 15 rotating at high speed.

A part of the chain rotating body 15 forms a large gap 40 between the bars 16, 16, and the gap 40 always opens upward near the blade 10 at the moment when the cutting mechanism 12 cuts the tubular film F. Thus, the chain rotating body 15 is configured to rotate. Accordingly, the upstream folding allowance F2 of the cut tubular film F is immediately sucked into the suction port of the suction pipe 14, and the upstream folding allowance F2 is pulled with a vacuum suction force, and the tube 16 is rotated by the bar 16 which rotates at high speed. The folding margin F2 on the upstream side of the film is bent to the bottom surface of the tray T.

JP-A-3-212307

As shown in FIG. 16, the conventional packaging device has a problem that curling 29 is formed at the folding margin F <b> 1 on the downstream side of the tubular film F, resulting in poor packaging. That is, as shown in the left diagram of FIG. 16, since the bar 16 is in line contact with the bottom surface of the tray T, the folding margin F1 on the downstream side of the tubular film F folded in the previous step is fluttered ( As shown in the right figure of FIG. 16, the folding margin on the downstream side is a gap between the bars 16 (a triangular gap formed between the pair of bars 16 and the bottom surface of the tray T). Wind up the tip of F1. At the tip, the curl 29 was formed in the process of moving the tray T, causing packaging failure.

The present invention has been proposed in view of the above-described problems related to the prior art described above, and it is proposed to solve this problem, and a film folding mechanism that does not curl in the folding margin on the downstream side of the tubular film is provided. An object is to provide a packaging apparatus provided.

In order to overcome the above-mentioned problems and to achieve the intended purpose suitably, a packaging apparatus according to the present invention includes a carry-in conveyor for placing a tray storing articles to be packed and carrying it to a downstream take-up conveyor side, and a take-up conveyor. An overlap mechanism that covers the tray transported by a conveyor with a belt-like film and overlaps both side edges of the belt-like film in a palm-like shape to form a tubular film, and a film for cutting the tubular film between the trays A cutting machine, a first film folding mechanism that sucks a folding margin downstream of the tubular film cut by the film cutting machine and folds it into the bottom surface of the tray, and is arranged on the downstream side of the film cutting machine. A second film folding mechanism for folding an upstream folding margin of the film-like film into the bottom surface of the tray. The pair of side conveyors for transporting the tray covered with the tubular film cut by the film cutting machine is disposed on the upstream side of the tubular film at a lower portion between the pair of side conveyors. An endless conveyor having a pull-in opening for sucking in and pulling in the folding allowance is disposed, a suction chamber for sucking the tube-shaped upstream folding allowance is disposed in the endless conveyor, and the upper surface of the endless conveyor is flat. Further, the structure is such that the downstream folding margin is sandwiched between the flat upper surface of the endless conveyor and the bottom surface of the tray so as not to wave.

Further, in the packaging device according to the present invention, the endless conveyor has a plurality of rods arranged in parallel between a pair of parallel endless chains, and one edge portion of the rod projects in a gap direction between adjacent rods. The gap is filled, and the support surface of the upper surface of the rod is formed flat.

In the packaging apparatus according to the present invention, the endless conveyor has a plate body laid between a pair of parallel endless chains, the plate body is a flat plate, and one edge of the plate body is It extends in the gap direction between adjacent plate bodies and is bent downward to fill the gap.

In the packaging device according to the present invention, the endless conveyor is a flat belt having elasticity.

The packaging apparatus according to the present invention has a flat top surface of the endless conveyor, and receives the folding margin on the downstream side of the tray on the flat surface, so that the downstream folding margin folded on the bottom surface of the tray becomes the endless conveyor. It is possible to suppress fluttering up and down (waving up and down) on the upper surface. For this reason, when the downstream folding allowance fluctuates up and down, the end of the downstream folding allowance is not curled, and packaging defects can be eliminated.

Moreover, the packaging apparatus provided with the film folding mechanism of the present invention is configured such that the upstream and downstream folding margins folded on the bottom surface of the tray are boiled on the flat surface of the top surface of the endless conveyor, thereby Can be reliably adhered.

The configuration of the packaging device including the second film folding mechanism eliminates the occurrence of packaging defects due to curling at the end of the downstream folding allowance by causing the downstream folding allowance to flutter up and down. Can do.

The front view of the packaging apparatus provided with the film folding mechanism of this invention The top view of the packaging apparatus provided with the film folding mechanism of this invention Front view of the film folding mechanism of the present invention The development view and front view of the endless conveyor of the film folding mechanism according to the first embodiment The fragmentary perspective view of the rod which comprises the endless conveyor of Example 1. FIG. The side view of the other rod which comprises some endless conveyors of Example 1. Partial enlarged use state diagram of the endless conveyor of Example 1 Usage state diagram of the endless conveyor of Example 1 Usage state diagram of the endless conveyor of Example 1 Exploded view and front view of endless conveyor of film folding mechanism according to embodiment 2 Side sectional view, plan view, front view of plate constituting the endless conveyor of Example 2 Partial enlarged use state diagram of endless conveyor of Example 2 The top view of the flat belt which comprises the endless conveyor of Example 3, and a front view The front view of the flat belt which comprises the endless conveyor of Example 3. Front sectional view of a film folding apparatus according to a conventional tray packaging machine State of use of conventional tray packaging machine

Next, an example is given about the packaging apparatus provided with the film folding mechanism based on this invention, and it demonstrates below, referring drawings. In this embodiment, the upstream side and the downstream side are selectively used in accordance with the moving direction of the strip film and the package.

Example 1
The packaging apparatus is configured such that the tray T storing the articles to be packaged is placed at equal intervals, and the carry-in conveyor 42 that feeds the tray T to the downstream-side take-up conveyor 41 side, and the tray T that is conveyed by the take-up conveyor 41 from above. A belt-like film (which will be described as a shrink film in the first embodiment, but the present invention is not limited to the shrink film 44) 44 is covered by the chuck chain 43, and both side edges of the belt-like film 44 are placed below the center roller 45. The overlap mechanism 46 is formed into a tubular film 49 using the adhesiveness of the belt-like film 44, and the tray T disposed downstream of the take-up conveyor 41 and covered with the tubular film 49 is conveyed. The first side conveyor 47 and the tubular film 49 wrapped around the tray T A film cutter 48 that cuts at intervals, and a first film that sucks the downstream folding margin 51 of the tubular film 49 that is arranged and cut at the lower downstream side of the first side conveyor 47 and folds it into the bottom surface of the tray T. A folding mechanism 52; a second film folding mechanism 53 that is arranged downstream of the film cutter 48, sucks the upstream folding margin 50 of the tubular film 49 and folds it into the bottom surface of the tray T; A heater conveyor 54 that shrinks the film at the bottom while carrying out the tray T in which the folding margins 50 and 51 at both ends are folded by the second film folding mechanism 52 and 53, and the tray T disposed at the top of the heater conveyor 54. The presser conveyor 55 for pressing and a shrink tunnel 56 for shrinking the entire tubular film 49 covering the tray T are configured.

Next, the 2nd film folding mechanism of this invention is demonstrated using FIG. The second film folding mechanism 53 is disposed in the upper left and right upper and downstream chain wheels 57 and 58, the tension wheel 59 disposed in the lower right, and the lower left in the front view. The four drive wheels 60 are provided, and an endless chain 61 is trapezoidally hung on the four wheels 57-60. The four wheels 57 to 60 have a pair of wheels arranged on the near side and the far side in FIG. 3 connected by a shaft, and rotate simultaneously by the endless chain 61. A driven wheel 62 is disposed on the right side of the drive wheel 60, and a chain 63 is wound between the wheels 60, 62. The chain 63 is pressed from above by a tension wheel 64 to apply tension to the chain 63. Yes. The crank mechanism 85 opens and closes the shutter of the suction hole 78 of the suction chamber 77 by the rotation of the driven wheel 62.

FIG. 4 shows a plan view of the endless conveyor and a front view thereof. A large number of rods 65 are spanned in parallel on the endless chain 61. As shown in the perspective view of FIG. 5, the rod 65 is a long plastic rod body. The front support surface 66 and the bottom surface 67 are flat when viewed from the front, and the upstream upper edge 68 is upstream. Projecting in a triangular shape in the direction of the gap between the rods 65 on the side, the upper gap between the rods 65 is filled. The downstream side surface 69 of the rod 65 is formed in a semicircular shape, and the upstream side surface 70 hangs down from the curved side surface of the upper edge 68 in the triangular shape to the bottom surface side, and the downstream side surface 69 of the upstream rod 65 and It is formed so as not to interfere, and can be rotated in forward and reverse directions around a fixing pin 71 that fixes the rod 65. A shaft hole 72 for fixing the rod 65 to the endless chain 61 is formed at both ends of the rod 65, and the fixing pin 71 inserted through the endless chain 61 is inserted into the shaft hole 72 to connect the rod 65 65 is installed on the endless chain 61.

The endless conveyor 79 is provided with a pull-in opening 73 for sucking and pulling in the upstream folding allowance 50 of the tubular film 49. The drawing openings 73 are similar to the conventional openings, and the rods 65 are removed by a predetermined number. Unlike the rod 65, a cylindrical rod 74 is bridged between both ends of the drawing opening 73 as shown in FIG. The cylindrical rod 74 has the same shape as that of the conventional bar 16, shaft holes 75 are formed at both ends of the cylindrical rod 74, and a fixing pin 76 inserted into the endless chain 61 is inserted into the shaft hole 75. The cylindrical rod 74 is fixed. The cylindrical rod 74 prevents the upstream folding allowance 50 from being caught by the cylindrical rod 74.

As described above, the endless conveyor 79 including the endless chain 61, the rod 65, the cylindrical rod 74, the drawing opening 73, and the like is disposed between the film cutting machine 48 and the heater conveyor 54. A suction chamber 77 is provided in the endless conveyor 79. A suction hole 78 is formed in the upper surface on the upstream side of the suction chamber 77, and when the suction chamber 77 is sucked by a vacuum suction device (not shown), the suction chamber 77 becomes negative pressure and sucks outside air. . When the drawing opening 73 of the endless conveyor 79 reaches the suction hole 78, the folding margin 50 on the upstream side of the tray T is drawn into the suction chamber 77 from the drawing opening 73 and the suction hole 78.

A second side conveyor 80 is provided on both sides of the upper end of the endless conveyor 79. The second side conveyor 80 conveys the tray T covered with the tubular film 49 from the both sides to the downstream side. The second side conveyor 80 is set to have a lower conveyance speed than the endless conveyor 79, and the upstream folding margin 50 of the tubular film 49 can be folded into the bottom surface of the tray T as will be described later.

As shown in FIGS. 8 and 9, the first film folding mechanism 52 is provided between the film cutter 48 and the first side conveyor 47. The first film folding mechanism 52 has a wind tunnel-like structure with a narrow upper portion. A suction opening 81 is provided in the upper portion, and a roller 82 is rotatably provided upstream of the suction opening 81. Yes. The operation of the first film folding mechanism 52 will be described later.

Next, the operation of the second film folding mechanism will be described with reference to FIGS. One cycle of the endless conveyor 79 of the film folding mechanism 53 is until the drawing opening 73 shown in FIGS. 8 and 9 makes a round from the upstream side (upper left corner in FIGS. 8 and 9) and returns to the same position. And During this one cycle, the tray T covered with the tubular film 49 is sent downstream by one cycle by the second side conveyor 80. That is, while the endless conveyor 79 rotates for one cycle, the tray T conveyed to the second side conveyor 80 is fed for one cycle to the position of the tray T shown on the right side. The second side conveyor 80 is continuously rotated at the same speed, and the tray T is continuously conveyed from the upstream side to the downstream side by the second side conveyor 80 at the same speed. Further, the endless conveyor 79 rotates at the same speed or intermittently, but the rotational speed is set faster than the second side conveyor 80.

As shown in (1) of FIG. 8, when the endless conveyor 79 is in the start position, the tray T is located on the downstream side of the drawing opening 73. The tray T on the endless conveyor 79 and the upstream tray T are connected by a tube-shaped film 49 and are not separated, but the blade receiver 83 of the film cutter 48 located at the upper part between the trays T is provided. It is lowered and fitted into the blade 84.

As shown in FIG. 8 (2), the tubular film 49 is cut with the blade receiver 83 and the blade 84. The folding margin 51 on the downstream side of the cut tubular film 49 is sucked by the suction opening 81 of the first film folding mechanism 52, and preparation for folding the folding margin 51 on the downstream side is started. On the other hand, between (1) and (2) in FIG. 8, the upstream folding allowance 50 is sucked by the suction chamber 77, and from the drawing opening 73 of the endless conveyor 79 and the suction hole 78 of the suction chamber 77. Be drawn. Although the tray T on the endless conveyor 79 is transported downstream, the transport speed of the second side conveyor 80 is slower than the speed of the endless conveyor 79, so that the upstream folding allowance 50 is brought into the bottom surface of the tray T by the drawing opening 73. Fold into. At that time, as shown in FIG. 7, the gap between the rods 65 of the endless conveyor 79 is eliminated to make the upper surface flat and the bottom surface of the tray T is received by the flat support surface 66, as shown in FIG. Further, it is possible to suppress the downstream folding margin 51 folded into the bottom surface of the tray T from fluttering (slightly undulating up and down) on the upper surface of the endless conveyor 79. For this reason, when the downstream folding allowance 51 flutters up and down, defective packaging due to curling at the end of the downstream folding allowance 51 can be eliminated. In addition, the upstream fold allowance 50 and the downstream fold allowance 51 folded on the bottom surface of the tray T are boiled by the flat support surface 66 of the endless conveyor 79 to ensure adhesion between the tray T, the film 44, and the film 44. be able to.

As described above, the folding margin 51 on the downstream side of the upstream tray T sucked by the suction opening 81 shown in FIG. 8B is in preparation for folding. Further, as shown in FIG. 8 (3), the tray T on the downstream side is completely folded and conveyed to the downstream side, but the drawing opening 73 passes the tray T and enters the next preparation. Yes. On the other hand, the upstream tray T rests on the blade 84 of the film cutter 48. FIG. 9 (4) shows the way in which the upstream tray T passes over the blade 84 of the film cutter 48. Further, the upstream and downstream trays T are conveyed downstream, and the downstream folding margin 51 of the upstream tray T is completely folded as shown in FIG. The downstream tray T is being carried out from the endless conveyor 79. Further, in FIG. 9 (6), the tube-shaped film 49 is just before cutting on the upstream tray T. The pull-in opening 73 of the endless conveyor 79 comes to the front of the start position. Further, returning to the state of FIG. 8 (1), such a cycle is repeated to wrap the tray T with the film 44.

(Example 2)
FIG. 10 is a plan view and a front view in which the endless conveyor of Example 2 is developed. As shown in FIG. 10, the endless conveyor 90 of the second embodiment has a long plate body 91 installed in place of the rod 65. The plate body 91 is made of a metal plate, and as shown in the lower side view of FIG. 11, the upper surface of the plate body 92 is a flat surface, and the downstream edge of the plate body 92. 93 extends in the gap direction between adjacent plate bodies 91 and is bent downward. The edge portion 93 fills the gap between the plate bodies 91. Both end portions of the plate body 91 are installed on the endless chain 61 by L-shaped brackets 94. The endless conveyor 90 of the second embodiment is also provided with a pull-in opening 95, and a cylindrical rod 74 as shown in FIG. 6 is attached to the upstream side of the pull-in opening 95.

As described above, by using the flat plate body 91 for the endless conveyor 90 of the second embodiment, the upper surface of the endless conveyor 90 is flat as in the first embodiment as shown in FIG. The downstream fold allowance 51 is sandwiched between the flat surface of the tray T and the bottom surface of the tray T, and the downstream fold allowance 51 folded into the bottom surface of the tray T flutters on the upper surface of the endless conveyor 90 (was slightly waved up and down). Can be suppressed. For this reason, when the downstream folding allowance 51 flutters up and down, it can suppress that the edge part of this folding allowance 51 curls, and a packaging defect can be eliminated. In addition, the upstream fold allowance 50 and the downstream fold allowance 51 folded on the bottom surface of the tray T can be boiled on the flat surface of the endless conveyor 90 to ensure the adhesion between the tray T, the film 44, and the film 44. it can.

(Example 3)
FIG. 13 is a partially omitted plan view and a front view of the endless conveyor according to the third embodiment, and FIG. 14 shows the front of the endless conveyor when the endless conveyor is attached to four wheels 57-60. The endless conveyor 96 of the third embodiment is made of a flat elastic plate having elasticity such as rubber. Reference numeral 97 denotes a drawing opening of the endless conveyor 96. The endless conveyor 96 of the third embodiment also receives the bottom surface of the tray T with the flat surface of the endless conveyor 96, so that the downstream folding margin 51 folded into the bottom surface of the tray T flutters on the top surface of the endless conveyor 96 (up and down Subtle undulations). For this reason, when the downstream folding allowance 51 flutters up and down, it can suppress that the end part of a downstream folding allowance curls, and a packaging defect can be eliminated. In addition, the upstream fold allowance 50 and the downstream fold allowance 51 that are folded into the bottom surface of the tray T are boiled on the flat surface of the endless conveyor 96 to ensure the adhesion between the tray T, the film 44, and the film 44. it can.

In the present invention, in order to wrap a tray in which an article to be packaged is stored, while feeding a strip-shaped film along the longitudinal direction, the tube is continuously covered to form a tube and cut to leave a folding margin, The present invention is useful for a packaging apparatus having a film folding mechanism that folds the folding margin at both ends of the tray into the bottom surface of the tray.

T tray 41 take-up conveyor 42 carry-in conveyor 46 overlap mechanism 48 film cutting machine 49 tubular film 50 upstream folding margin 51 downstream folding margin 52 first film folding mechanism 53 second film folding mechanism 54 heater conveyor 56 shrink tunnel 61 Endless chain 65 Rod 66 Support surface 68 Upper edge 69 Downstream side surface 70 Upstream side surface 73 Retraction opening 74 Cylindrical rod 77 Suction chamber 78 Suction hole 79 Endless conveyor 80 Second side conveyor 81 Suction opening 90 Endless conveyor 91 Plate body 92 Plate body 93 Edge 95 Pull-in opening 96 Endless conveyor

Claims (4)

Place the tray that contains the items to be packaged and carry it to the downstream take-up conveyor side, and cover the tray transported by the take-up conveyor with a belt-like film, and the both side edges of this belt-like film are in the shape of a palm An overlap mechanism that forms a tube-shaped film superimposed on the film, a film cutting machine that cuts the tube-shaped film between the trays, and sucks the folding margin on the downstream side of the tube-shaped film cut by the film cutting machine. A first film folding mechanism that folds into the bottom surface of the tray, and a second film folding mechanism that is arranged on the downstream side of the film cutting machine and folds the folding margin on the upstream side of the tubular film into the bottom surface of the tray. In the packaging device provided,
In the second film folding mechanism, a pair of side conveyors that convey the tray covered with a tubular film cut by a film cutter is disposed, and the tubular shape is disposed at a lower portion between the pair of side conveyors. An endless conveyor having a drawing opening that sucks in and draws in the folding margin on the upstream side of the film is disposed, and a suction chamber for sucking the tubular folding margin on the upstream side is disposed in the endless conveyor. The upper surface is flat, and is configured to be sandwiched between the flat upper surface of the endless conveyor and the bottom surface of the tray so that the downstream folding margin does not undulate,
A packaging apparatus provided with a film folding mechanism. In the endless conveyor, a plurality of rods are installed in parallel between a pair of parallel endless chains, and one edge of the rod projects in the gap direction between adjacent rods to fill the gap, thereby supporting the upper surface of the rod. 2. The packaging apparatus having a film folding mechanism according to claim 1, wherein the surface is formed flat. In the endless conveyor, a plate body is installed between a pair of parallel endless chains, the plate body is a flat plate, and one edge of the plate body is a gap between adjacent plate bodies. 2. The packaging device having a film folding mechanism according to claim 1, wherein the packaging device extends in a direction and is bent downward to fill the gap. The packaging apparatus having a film folding mechanism according to claim 1, wherein the endless conveyor is a flat elastic plate having elasticity.