JP7165990B2 - tray packing machine - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies 1) Part exchange destination: Komoro Mushroom Center, Fourth Production Department, Hokuto Co., Ltd. 2) Part exchange date: June 3, 2019 3) Part exchange party: Ibaraki Seiki Co., Ltd. 4 ) Location where parts were replaced: 483-12 Sunahara, Wada, Komoro City, Nagano Prefecture Hokuto Co., Ltd. Fourth Production Department Komoro Mushroom Center

In the present invention, an object to be packaged is stored in a tray and wrapped in a strip film in a tubular shape, and then the tubular film is cut while leaving a margin for folding at both ends, and the front and rear folding margins are attached to the bottom of the tray. The present invention relates to a tray packaging device equipped with a film folding mechanism.

First, the overall structure and operation of the tray packaging apparatus of the present invention will be described. FIG. 7 is an overall front view of the tray packaging apparatus 1. FIG. In the following description, the direction in which the trays are transported is defined as the downstream side (rightward direction in the drawing), and the opposite direction is defined as the upstream side (leftward direction in the drawing).

The tray packaging apparatus 1 places trays containing articles to be packaged at equal intervals by a conveyer 2 and feeds them to the downstream side. A belt-shaped film (shrink film in this embodiment) F is covered with a chuck chain 1A from above the tray being conveyed by the take-up conveyor 1C on the downstream side of the conveyer 2, and both side edges of the belt-shaped film F are placed downward. The center roller 1B superimposes them in a palm-to-palm shape, and a tube-shaped film is formed by utilizing the stickiness of the belt-shaped film F.

A side conveyor 3 is arranged downstream of the take-up conveyor 1C, and conveys the tray covered with the tubular film downstream. A film cutter 4 is provided in the middle of the side conveyor 3, and cuts the tubular film wrapped in the tray at predetermined intervals. As will be described later, a first film folding mechanism 5 is arranged in the lower part of the film cutting machine 4 just upstream of the film cutting machine 4, sucks the folding margin on the downstream side of the cut tubular film, and folds it into the bottom of the tray.

Further, a second film folding mechanism 6 is arranged downstream of the film cutter 4, sucks the folding margin on the upstream side of the tubular film, and folds it into the bottom surface of the tray. The tray with the folding margins at both ends folded by the first and second film folding mechanisms 5 and 6 is pressed by the pressing conveyor 1E, and the bottom film is shrunk while being transported by the heater conveyor 1D. Furthermore, the shrink tunnel 1F entirely shrinks the tubular film covering the tray.

FIG. 8 is a front cross-sectional view of the first film folding mechanism 5 and the second film folding mechanism 6 of the tray packaging device 1 of Patent Document 1. As shown in FIG. As described above, the tray packaging apparatus 1 transports the trays T, T containing the items to be packaged by the transport conveyor 2, and forms the strip film 8 into a tubular shape with a bag-making chisel (not shown). The trays T, T are inserted into the tube-shaped film 8 and covered with the tubular film 8.例文帳に追加

The trays T, T covered with the tubular film 8 are sandwiched between the side conveyors 3 indicated by the dashed line, and transferred from the take-up conveyor 1C side to the second film folding mechanism 6 side. After being covered with the tubular film 8, the trays T, T are successively transported in the direction of the arrow Y for packaging.

As shown in FIG. 8, the film cutter 4 for cutting the tubular film 8 wrapping the tray T is composed of a lower blade 4B and an upper U-shaped blade holder 4A. A suction pipe 5A of the first film folding mechanism 5 and a suction mechanism 6A of the second film folding mechanism 6 are provided in front and rear.

The suction pipe 5A is arranged upstream of the film cutter 4. As shown in FIG. The suction pipe 5A has a cubic shape, communicates with a vacuum suction device (VAC) (not shown), and sucks the folding margin 8A on the downstream side from the upper end to the inside.

The suction mechanism 6A on the downstream side of the film cutter 4 has a box-like cross section, and the inside communicates with the VAC. A pair of endless side chains 63A are stretched over the outer periphery of the box at a distance in parallel to the front and back sides of FIG. A suspended screen-like conveyor 63 is circulating. In the above configuration, the moving speed V2 of the interdigital conveyor 63 is set faster than the moving speed V1 of the side conveyor 3 that transfers the tray T between them.

When the blade holder 4A of the film cutter 4 descends as indicated by the phantom line, the tubular film 8 between the trays T is cut. As a result of the cutting, the folding margin 8A on the downstream side of the tray T is sucked into the suction pipe 5A immediately after cutting, and is folded to the downstream side back surface of the tray T by the force of the tray T conveyed by the side conveyor 3.

On the other hand, the upstream folding margin 8B of the tray T is folded into the upstream bottom surface of the tray T by the second film folding mechanism 6 . That is, the blind conveyor 63 is formed with a large opening 63D along the running direction of the conveyor. The timing is rotationally synchronized to arrive on portion 63D.

Therefore, the upstream folding margin 8B of the cut tubular film 8 is immediately sucked into the opening 63D of the inter-belt conveyor 63 and the suction hole 61A of the suction mechanism 6A, and then the opening of the inter-belt belt 63. The upstream folding margin 8B is folded into the upstream bottom surface of the tray T by being caught by the rod 63B on the upstream side of 63D and moving faster than the side belt 3. As described above, the upstream folding margin 8B and the downstream folding margin 8A are folded on both sides of the back surface of the tray T. As shown in FIG.

JP-A-3-212207

By the way, in the conventional tray packaging device 1 shown in FIG. However, there is a problem that the sheet rolls up and folds up to cause packaging defects.

That is, when the rod 63B of the interdigital belt 63 slidingly contacting the bottom surface of the tray T moves faster than the tray T being conveyed by the side conveyor 3, the folding margin on the downstream side of the tray T is increased. The end of the folding margin 8A may be caught by the end of the tray T and rolled up. As a result, as shown in FIG. In some cases, the packaging was damaged and folded over, resulting in poor packaging.

In view of such a problem, it is conceivable to form the space between the rods 63B and 63B flat so as not to form a concave portion on the surface between the rods 63B. Due to the sliding contact with the folding margin 8A, the packaging defects such as folding occur as described above, and the packaging defects have not been completely eliminated.

SUMMARY OF THE INVENTION The present invention has been proposed in view of such problems and to preferably solve them, and is provided with a film folding mechanism that does not cause packaging defects in the folding margin 8A on the downstream side of the tubular film 8. It is an object of the present invention to provide a tray packaging device 1 with a

In order to achieve the above object and the intended purpose, a tray packaging apparatus according to the present invention is provided with a conveyor that conveys trays filled with articles to be packaged in a row, and a conveyor that conveys trays filled with articles to be packaged in a row. The tray placed on the take-up conveyor is covered with a tube-shaped film, and a side conveyor is arranged downstream of the take-up conveyor for sandwiching and conveying the tray covered with the tubular film from both sides, A film cutting machine for cutting the tubular film between the trays is arranged in the middle of the side conveyor, and the folding margin of the cut tubular film on the downstream side of the tray is sucked to the downstream bottom surface of the tray. A first film folding mechanism for folding is arranged on the upstream side of the film cutting machine, and a second film folding mechanism for folding the folding margin on the upstream side from the tray to the upstream bottom surface of the tray is arranged on the downstream side of the film cutting machine. The second film folding mechanism places a folding margin on the upstream side of the tray for the cut tubular film in the lower part of the transport area of the tubular film transported with both ends cut by the film cutter. A sucking mechanism having a sucking hole for sucking and drawing, and a comb-shaped conveyor mechanism that rotates around the outer circumference of the sucking mechanism faster than the side conveyor, and the comb-shaped conveyor mechanism has a folding margin on the upstream side of the tray. A tray packaging device in which a large number of rods are installed at equal intervals between a pair of side chains on both sides in the conveying direction, except for an opening for drawing in by sucking from the suction hole of the suction mechanism,
A large number of abacus-bead-shaped rotating bodies are supported by the rod, and each row of the abacus-bead-shaped rotating bodies supported by the rod is positioned so that the recesses and projections of the front and rear rows of the rotating bodies are fitted to each other . arranged so that there is no gap between adjacent rotating bodies, each rotating body is independent, and while each rotating body rotates freely, the direction in which the downstream folding margin is folded is different It is characterized in that it slides in the opposite direction without rolling up the folding margin.

Each row of the abacus bead-shaped rotating bodies pivotally supported by the rod is arranged at a position where the recesses and protrusions of the front and rear rows of rotating bodies are fitted to each other so that there is no gap between the adjacent rotating bodies. With this configuration, the folding margin on the downstream side does not get caught in the gap between the rotating bodies. As a result, the folding margin on the downstream side is prevented from being rolled up and folded, and packaging defects in the folding margin on the downstream side of the tray can be eliminated .

A connecting pin for fixing the rod to the side chain is provided at the end of the rod, and a shaft hole is formed in the connecting pin. A fixing pin inserted through the side chain is inserted through the shaft hole. It is characterized in that the rod is installed on the side chain .

According to the above configuration, in the second film folding mechanism, the rotating body that functions to fold the upstream side folding margin of the tray into the tray rear surface contacts the downstream side folding margin folded into the tray rear surface. Even if there is a problem, the rotating body pivotally supported by the rod comes into contact with the rotating body in a free-rotating state, so that the folding margin on the downstream side does not roll up and the ends of the folding margin on the downstream side are folded. Defects will no longer occur.

FIG. 2 is a front view of the second film folding mechanism of the tray packaging apparatus of the present invention; FIG. 4 is a developed plan view of the interdigital conveyor of the second film folding mechanism of the present invention; Front view of Figure 2 FIG. 10 is a plan view of the main part of another embodiment of the interdigital conveyor of the present invention; FIG. 11 is a plan view of the main part of another embodiment of the interdigital conveyor of the present invention; Operation explanatory diagram of the first and second film folding mechanisms of the first embodiment Overall front view of tray packaging machine Front view of the first and second film folding mechanisms of Patent Document 1 Bottom view showing the packaging state of the tray T of the conventional example

Next, a tray packaging apparatus equipped with a film folding mechanism according to the present invention will be described below with reference to the accompanying drawings. Since the basic configurations of the conveyer 2, the side conveyor 3, the film cutter 4, the first film folding mechanism 5, the second film folding mechanism 6, etc., which constitute the tray packaging apparatus 1 explained in the background art are the same, In the following, the same configurations are denoted by the same reference numerals in the drawings, and detailed descriptions thereof are omitted.

(Example 1)
FIG. 1 is a cutaway front view of the second film folding mechanism of the tray packaging apparatus of the present invention. The second film folding mechanism 6 folds the cut tubular film 8 upstream of the tray 7 in the lower part of the transport area of the tubular film 8 which is transported after being cut at both ends by the film cutter 4 . It has a sucking mechanism 6A having a sucking hole 61A for sucking and drawing the carriage 8B, and a comb-shaped conveyor mechanism 6B having a comb-shaped conveyor 63 that circulates around the outer periphery of the sucking mechanism 6A faster than the side conveyor 3.

As shown in FIG. 1, the suction mechanism 6A has a hollow box shape with a flat upper portion and a mountain-shaped lower portion when viewed from the front. It has a suction hole 61A for drawing in. The inside of the suction mechanism 6A communicates with a vacuum suction device (VAC) (not shown), and when suctioned by this vacuum suction device, the inside of the suction mechanism 6A becomes negative pressure, and outside air is sucked from the suction hole 61A. At the same time, the folding margin 8B on the upstream side is drawn in by suction. As will be described later, the intake hole 61A is opened and closed by a shutter 61B.

The interdigital conveyor mechanism 6B includes upstream and downstream chain wheels 62A and 62B arranged on the upper left and right sides of the suction mechanism 6A, a tension wheel 62C arranged on the lower right side, and a tension wheel 62C arranged on the lower left side. It has four wheels, a drive wheel 62D, on which a comb conveyor 63 winds around the circumference of the intake mechanism 6A. The four wheels 62A to 62D are a pair of wheels arranged on the front side and the back side in FIG. 1, which are connected by shafts and rotate simultaneously.

Another driven wheel 62E is axially supported on the side of the drive wheel 62D, and is driven by a chain 62G wound around it. In addition, 62F in the drawing indicates a tension roll for adjusting the tension of the chain 62G. A cam 62e is provided coaxially with the driven wheel 62E, and the shutter 61B of the suction hole 61 of the suction mechanism 6A is driven to open and close by a crank mechanism 61C which reciprocates up and down in contact with the cam 62e.

FIG. 2 shows an exploded plan view of interdigital conveyor 63 that wraps around wheels 62A-62D of intake mechanism 6A of the present invention. The interdigital conveyor 63 has a side chain 63A and a large number of rods 63B that are connected in parallel. That is, the end of the rod 63B is provided with a connecting pin 63E for fixing the rod 63B to the side chain 63A, and the connecting pin 63E is formed with a shaft hole 63b, through which the side chain 63A is inserted. A pin 63a is inserted through the shaft hole 63b, and a rod 63B is mounted on the side chain 63A.

The interdigital conveyor 63 is provided with an opening 63D for sucking and pulling in the upstream folding margin 8B of the tubular film 8 covering the tray T. As shown in FIG. A predetermined number of rods 63B are removed from the side chain 63A in the opening 63D.

When the drive wheel 62D rotates and the opening 63D of the interdigital conveyor reaches the suction hole 61A, the shutter 61B is opened at the same time. The folding allowance 8B on the upstream side of the tray T is pulled.

The tray T covered with the tubular film 8 cut at both ends is sandwiched between the side conveyors 3 and conveyed downstream. Therefore, due to the speed difference, the upstream folding margin 8B of the tray T drawn into the suction hole 61A is dragged while being locked by the rod 63B of the opening 63D of the interdigital conveyor. folded into the bottom of the

A large number of rotating bodies 63C are rotatably supported on each of the rods 63B. The rotating body 63C shown in FIGS. 2 and 3 has the same shape as an abacus bead. The outer periphery of a disk is cut into a tapered shape, and the central portion is sharpened to form a rhombus in plan view and side view. ing. The rotating body 63C may be made of wood like the abacus ball, or may be made of synthetic resin or metal. Each rotating body 63C is independent, and each rotating body 63C can rotate freely (freely rotate clockwise or counterclockwise).

Further, the rotating bodies 63C on the front and rear rods 63B are axially supported with a pitch shifted so that the recesses and protrusions of the adjacent rotating bodies 63C are fitted to each other, as clearly shown in FIG. In this manner, the fitting of the rotating bodies 66 prevents the formation of linear gaps between the rods 65 .

Next, the operation of the tray packaging apparatus of the present invention will be described with reference to FIG. One cycle of the interdigital conveyor mechanism 6B is defined as the opening 63D of the interdigital conveyor 63 going around from the upper left corner position in FIG. 6(1) and returning to the same position. During this one cycle, the tray T covered with the tubular film 8 is sandwiched between the side conveyors 3 and conveyed from position P1 in FIG.

In FIG. 6(1), the interdigital conveyor 63 is at the start position, and the tray T is positioned downstream of the opening 63D. At this time, the tray T on the interdigital conveyor 63 and the tray T on the upstream side are connected by the tubular film 8 and are not separated.

Immediately after FIG. 6(1), the tubular film 8 is cut by the knife receiver 4A and the knife 4B, and the tray T on the take-up conveyor 1C is positioned so that the folding margin 8A on the downstream side of the cut tubular film 8 is the suction pipe 5A. Then, preparation for folding the folding margin 8A is started. At the same time, the folding margin 8B on the upstream side of the tray T on the second film folding mechanism 6 is also sucked into the suction mechanism 6A at the position where the opening 63D and the suction hole 61A of the suction mechanism 6A are synchronized.

Since the conveying speed V1 of the tray T by the side conveyor 3 is slower than the moving speed V2 of the interdigital conveyor 63, the upstream folding margin 8B is above the rod 63B on the upstream side of the opening 63D, as shown in FIG. 6(2). , and is folded into the bottom surface of the tray T while being pulled downstream.

As shown in FIGS. 6(1) to 6(3), the plurality of rows of rotors 63C are folded into the bottom surface of the tray T and arranged on the upstream side and the downstream side. It slides while contacting the folding margins 8B and 8A. The multiple rows of rotors 63C slide in the direction opposite to the direction in which the downstream folding margin 8A is folded. , there is no danger of rolling up the folding margin 8A on the downstream side.

Further, each row of the abacus ball-shaped rotating bodies 63C pivotally supported by the rod 63B is arranged at a position where the recesses and protrusions of the front and rear rows of the rotating bodies 63C are fitted to each other, and the gaps between the adjacent rotating bodies 63C are arranged. By constructing such that there is no gap, the folding margin 8A on the downstream side does not get caught in the gap between the rotors 63C. Therefore, as shown in FIG. 9, the folding margin 8A on the downstream side is prevented from being rolled up and folded on top of each other.

Then, the opening 63D of the interdigital conveyor 63 passes the tray T as shown in FIG. 6(3) and returns to the position shown in FIG. 6(1) at high speed to wait for the next tray T. .

(Example 2)
In the first embodiment, the rotator 63C pivotally supported by the rod 63B of the interdigital conveyor 63 is shown as a abacus bead, but as shown in FIG. 4, it may be a disk-shaped rotator 63C. . In the case of the disk-shaped rotors 63C, if a gap is provided between adjacent rotors 63C and the front and rear rows of rotors 63C are arranged to fit in the gaps, the same effect as described above can be obtained.

(Example 3)
Furthermore, as shown in FIG. 5, the rotor 63C may be spherical. In the case of such a spherical rotating body 63C as well, it is preferable that the front and rear rotating bodies are arranged without gaps.
Although the rotors in the front and rear rows are arranged without gaps, the rotors 63C are not necessarily arranged so as to fill the gaps.

INDUSTRIAL APPLICABILITY The present invention is useful for a tray packaging device provided with a film folding mechanism for folding the folding margins of both ends of the tray into the bottom surface of the tray.

1 Tray packaging device 2 Conveyor 3 Side conveyor 4 Film cutter 4A Blade receiver 4B Blade 5 First film folding mechanism 5A Suction pipe 6 Second film folding mechanism 6A Suction mechanism 61A Suction hole 61B Shutter 61C Crank mechanism 6B Screen conveyor mechanism 62A upstream chain wheel 62B downstream chain wheel 62C tension wheel 62D driving wheel 62E driven wheel 62e cam 62F tension roll 62G chain 63 interdigital conveyor 63A side chain 63a fixing pin 63B rod 63b shaft hole 63C rotating body 63D opening 8 tubular Film 8A Downstream side folding margin 8B Upstream side folding margin T Tray

Claims (2)

A transport conveyor is provided for transporting trays filled with items to be packaged in a row, and the trays placed on a take-up conveyor on the downstream side of the transport conveyor are covered with a tube-shaped film, and the take-up conveyor is provided. A side conveyor for sandwiching and conveying the tray covered with the tubular film from both sides is arranged downstream of the above, and a film cutter for cutting the tubular film between the trays is arranged in the middle of the side conveyor, A first film folding mechanism is arranged upstream of the film cutting machine to suck the folding margin on the downstream side of the tray of the cut tubular film and fold it into the bottom surface of the downstream side of the tray, and upstream of the tray. A second film folding mechanism for folding the folding margin into the upstream bottom surface of the tray is arranged downstream of the film cutter, and the second film folding mechanism cuts both ends by the film cutter and conveys the tube. a suction mechanism having a suction hole for sucking and drawing the folding margin on the upstream side from the tray of the cut tubular film in the lower part of the conveying area of the tubular film; and a revolving interwoven conveyor mechanism, wherein the interwoven conveyor mechanism has openings for sucking and drawing in the folding margins on the upstream side of the tray from the suction holes of the suction mechanism, and on both sides in the conveying direction. A tray packaging device in which a large number of rods are installed at equal intervals between a pair of side chains,
A large number of abacus-bead-shaped rotating bodies are supported by the rod, and each row of the abacus-bead-shaped rotating bodies supported by the rod is positioned so that the recesses and projections of the front and rear rows of the rotating bodies are fitted to each other . arranged so that there is no gap between adjacent rotating bodies, each rotating body is independent, and while each rotating body rotates freely, the direction in which the downstream folding margin is folded is different A tray packaging device characterized in that it slides in the opposite direction without rolling up the folding margin. A connecting pin for fixing the rod to the side chain is provided at the end of the rod, and a shaft hole is formed in the connecting pin. A fixing pin inserted through the side chain is inserted through the shaft hole. 2. The tray packaging device according to claim 1, wherein the rod is mounted on the side chain.

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