JP2001122210A - Stretch packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely carry out the film terminal processing. SOLUTION: A sealing device (a sealing bar 101 and a sealing bar support 104) welding a film terminal of a film wound on a material to be packaged and a stretching, and contracting clamp 103 having clamping materials 131 disposed at intervals along the one direction and also having a stretching and contracting mechanism for changing the intervals between the clamping materials 131, are disposed. When the terminal processing for films F is carried out, the width of the film terminals is contracted to, for instance, approximately 1/2 by the stretching and contracting clamp 103, and welding is carried out in the state of overlapping the films F uniformly in the gusset shape to increase the welding strength of the film terminals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch wrapping machine for winding a plastic film around a plurality of packages stacked on a pallet while winding and packing the plastic film.

[0002]

2. Description of the Related Art Various products to be distributed and sold are often packaged in small units in cardboard boxes or the like, and are often transported, unloaded and stored in a state in which a predetermined number of such packages (packages) are palletized. .

[0003] Palletized luggage is used for transportation, cargo handling,
During storage or the like, the collapse of the load is likely to occur, and during transportation or the like, the product may be wetted by rainwater or the like, or may be stained to lower the commercial value. Furthermore, there is a possibility that the cargo may be unloaded during storage. So recently,
A plastic film such as polyethylene is wrapped around a plurality of palletized luggage, so-called stretch wrapping is used to prevent collapse of the luggage and measures are taken to protect the luggage from rainwater, dirt, and unloading. .

Conventionally, as a device for performing such stretch packaging, a fixing table on which a load is placed, a carriage on which a feeding roller for feeding a film is mounted, an arm for rotating the carriage around the side of the load, and a carriage With a lifting mechanism that moves the pallet up and down, the film is fed out to the side of the load while rotating the carriage around the side of the load while the palletized load is placed on the fixed base, and the pallet is raised and lowered by moving the carriage up and down. There is an arm-rotation type stretch wrapping machine that spirally winds a film around a pile of luggage (Japanese Patent Laid-Open No. 8-156).
908).

FIG. 1 shows another stretch packaging machine.
As shown in FIG. 5, a turntable 202 on which a load W is placed
A carriage 204 on which a feeding roller 206 for feeding a film is mounted, a mast 203 for supporting the carriage 204, and an elevating mechanism 205 for vertically moving the carriage 204 along the mast 203.
04, the film F is loaded on the turntable 202 while the load W stacked on the pallet is placed on the turntable 202.
There is a turntable type stretch wrapping machine that spirally winds a film F around a palletized luggage W by moving the carriage 204 up and down while raising the carriage 204 (for example, Japanese Patent Publication No. 59-9403).

[0006] In this type of stretch wrapping machine, as a terminal treatment of the film, conventionally, a method of bonding the film terminal to the film wound around the luggage by welding, or a method of utilizing the adhesiveness of the film itself to form the film terminal. A squeezing roller for squeezing a flat film stretched between a film roll and a packaged object from a side edge between a film roll and an article to be packaged, as disclosed in JP-A-8-156908. And welding the film terminals together in a rope shape.

[0007]

However, according to the above-mentioned film terminal treatment, the film terminal has a weak welding force (adhering force) in any case, and the film terminal peels off when the storage period of the package is prolonged. There is a problem. In addition, in the case of processing in which the film terminals are collectively welded in a rope shape, since the rope-shaped film is in a finished state in which it is wound multiple times at the lower part of the package, there is also a problem that the appearance of the package is deteriorated. .

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a stretch wrapping machine capable of reliably performing film terminal processing.

[0009]

According to the present invention, there is provided a stretch wrapping machine comprising: a carriage on which a feeding roller for feeding a film is mounted; a rotating mechanism for relatively rotating the carriage and an object to be packaged; A film roll is mounted on the carriage, and the film is fed out to the packaged object while the carriage and the packaged object are relatively rotated, and the carriage is moved up and down to the packaged object. In a packaging machine for winding a film, a sealing device (seal bar and seal bar receiver) for welding a film terminal to a film wound on an object to be packaged and a clamp material are arranged at intervals from one another in one direction. In addition, a telescopic clamp having a telescopic mechanism for changing the distance between the clamp materials is provided. The clamp is disposed between the sealing device and the film roll during the processing of the film end, and the film is wound around the outer peripheral surface of the clamp material. In this state, the interval between the clamp materials is reduced by the expansion and contraction mechanism, and the width direction of the film is changed. It is characterized by being configured to shrink.

According to the stretch wrapping machine of the present invention, the telescopic clamps in which the clamp materials are arranged at intervals from each other are arranged in the terminal processing section, and when the terminal processing of the film is performed, the width of the film terminal is controlled by the telescopic clamps. To 1 /
2 and the film is folded into a fold
3), it is possible to obtain welding strength about twice or more as compared with the case where the film is welded in a flat state. In addition, since the width of the final film terminal is merely reduced to about １ ／, the finished state of the terminal processing can be almost as good as the case where the film terminal is welded in a flat state.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view schematically showing an overall configuration of an embodiment of a stretch packaging machine according to the present invention.

The embodiment shown in FIG. 1 is an arm-rotating stretch wrapping machine, which comprises a gate-shaped gantry 1 comprising a top beam 1a and a base frame 1b supporting both ends thereof, a conveyor 2, an arm 3, an carriage 3, It mainly includes a lifting mechanism 5, a film feeding device 6, a controller 7, and the like.

Conveyor 2 carries palletized cargo W
This is a device for transporting and fixing the frame at a central position below the top beam 1a of the gantry 1.

The arm 3 is an inverted L-shaped member composed of a horizontal beam 3a and a vertical beam 3b.
Is rotatably supported at the center of the top beam 1a of the gantry 1. The arm 3 has an arm rotation motor 3 installed at the upper center of the top beam 1a of the gantry 1.
The rotation of the arm 3 causes the carriage 4 to rotate (revolve) around the side of the load W disposed at the center of the gantry 1.

The carriage 4 is provided with a vertical beam 3 of the arm 3.
b is vertically movably supported by the lifting mechanism 5. The elevating mechanism 5 is a mechanism generally applied to this type of stretch wrapping machine. For example, a carriage elevating motor 50 and a belt (not shown) wound around a rotating shaft of the carriage elevating motor 50 via a pulley or the like. ), The carriage lifting motor 50
The belt is moved up and down by the rotation of, and the carriage 4 is raised and lowered.

The film feeding device 6 is mounted on the carriage 4 and has two rollers, a feeding roller 61 and a stretching roller 62, as shown in FIGS. 2A and 2B. The rotation shaft 61a of the feeding roller 61 is provided with a pair of spur gears 6 on the rotation shaft 60a of the film feeding motor 60.
4, 65 are connected. A gear 66 fixed to a rotating shaft 61a of the feeding roller 61 is meshed with a gear 66 connected to an electromagnetic clutch 63, and a rotating shaft 62a of the stretching roller 62 is joined to an output shaft 63a of the electromagnetic clutch 63. 67 are connected. In addition, as the electromagnetic clutch 63, for example, a powder clutch that uses magnetic iron powder for torque transmission and that can adjust the transmission torque steplessly by controlling the applied voltage is used.

In the above-described film feeding device 6, as shown in FIG. 3, the film F from the film roll R is passed between the stretching roller 62 and the feeding roller 61 in a sewing manner. Book guide roller 6
8 and 69 (see FIG. 8), the film F is fed toward the side of the load W on the conveyor 2. The feeding amount can be controlled by the rotation speed of the film feeding motor 60. Further, in the film feeding device 6, by changing the voltage applied to the electromagnetic clutch 63, the rotation ratio between the feeding roller 61 and the stretching roller 62 can be adjusted steplessly. Roller 6
According to 1 and 62, the film F can be fed out to a load W on the conveyor 2 in a state where the film F is given a pre-stretch (pre-stretching).

In this embodiment, as shown in FIG. 1 and FIG.
0 is provided. The details of the terminal processing device 100 will be described below with reference to FIGS. 4 and 5 to 13.

The terminal processing device 100 includes two seal bars 101 and a seal bar receiver 104 that constitute a sealing device.
And a nichrome wire 102 for film cutting and a telescopic clamp 103.

The seal bar 101 is heated to a temperature at which the end of the film F can be welded by a built-in heater (not shown). The nichrome wire 102 is placed between the telescopic clamp 103 and the
1 is installed in parallel with the front surface. The nichrome wire 102 is energized at the time of film terminal processing, and the film F from the film roll R is passed through the seal bar 1.
Cut (fusing) at the front stage of 01 (the telescopic clamp 103 side)
can do.

The two seal bars 101 and the nichrome wires 102 are held on a moving plate 105. The moving plate 105 is supported by a pusher 106. By driving the pusher 106, the two seal bars 101 and the nichrome wire 102 are moved to the retracted position shown in FIGS.
01 can be selectively arranged at two positions of use (FIGS. 7 and 10) in contact with or close to the seal bar receiver 104.

FIG. 11 and FIG.
As shown in the figure, a large number of clamp materials (disc-shaped) 131
31 are arranged at an interval from one another along one direction (axial direction). These clamp members 131 can move in the axial direction along the guide bar 133.
A compression coil spring 134 is interposed between the clamp members 131 adjacent to each other, so that a certain interval is secured between the clamp members 131.

In the center of the telescopic clamp 103, a telescopic mechanism 1 is provided.
32 are provided. Operation rod 1 of extension mechanism 132
The distal end of 32a is connected to the clamp member 131 at the extreme end, and when the telescopic mechanism 132 is driven to retract the operation rod 132a from the state (open state) shown in FIG.
As shown in FIGS. 12A and 12B, each clamp material 1
The intervals of 31... 131 are reduced. Further, the telescopic mechanism 132 is driven from the contracted state shown in FIG.
The original state (FIG. 12A) can be returned by advancing 2a. In addition, as the telescopic mechanism 132, a general mechanism such as an air cylinder or a mechanism combining a feed mechanism and a motor is used.

The above-mentioned two seal bars 101, nichrome wires 102 and telescopic clamps 103 are mounted on a turntable 107.

The turntable 107 is rotatably supported by a bracket 21 provided on the side surface of the conveyor 2 as shown in FIGS. An operation rod 108a of an air cylinder 108 is supported on the turntable 107 by a support arm 107a.
When the air cylinder 108 is driven, the seal bar 101, the nichrome wire 102, and the telescopic clamp 103 are moved into two positions, a horizontal position shown in FIG. 5 and an upright position shown in FIGS. Can be selectively placed in a state.

On the other hand, as shown in FIG. 4, the seal bar receiver 104 is supported by a rotating shaft 22 provided on the side surface of the conveyor 2, and is rotatable in a vertical plane along the feeding direction of the conveyor 2. I have. An air cylinder 109 is connected to the seal bar receiver 104. By driving the air cylinder 109, the seal bar receiver 104 is selectively moved into a horizontal position parallel to the conveyor 2 and a standing position perpendicular to the conveyor 2. Can be arranged. When the seal bar receiver 104 is in the upright posture and the two seal bars 101 are in the upright posture, the two seal bars 101 and the seal bar receiver 104 face each other. In addition, the seal bar receiver 104 is configured to rotate from the upright posture toward the carry-out direction of the load W and shift to the horizontal posture (see FIG. 4).

In the above configuration, the arm rotating motor 30, the carriage elevating motor 50, the film feeding motor 60 and the electromagnetic clutch 63, the telescopic clamp 103 of the terminal processing device 100, the pusher 10
The driving of each of the six and two air cylinders 108 and 109 is controlled by the controller 7 by the operation described later.

Next, the film winding operation of this embodiment will be described with reference to FIG. 1 and FIGS.

First, the seal bar 101 and the nichrome wire 10
The film winding is started in a state where the second and the telescopic clamp 103 and the seal bar receiver 104 are arranged in a standby state (horizontal posture). That is, the film winding is performed by setting the film roll R on the carriage 4 and disposing the palletized luggage W at the center position of the gantry 1 while rotating the arm 3 to transfer the film F from the film roll R to the side of the luggage W. The carriage 4 is moved up along the vertical beam 3b of the arm 3, and the film F is spirally wound upward from the lower end of the load W.

After the position of the film roll R exceeds the height corresponding to the upper end of the seal bar receiver 104 in the upright state during the winding of the film, that is, the rising of the carriage 4, the air cylinder 109 is driven to drive the seal. The bar receiver 104 is set up (FIG. 4). Then, when the film winding reaches the upper end of the luggage W, the raising of the carriage 4 is stopped, and the film F is wound around the upper end a predetermined number of times (upper winding number).

After the upper winding process is completed, the carriage 4 is lowered and the film F is wound in a spiral shape toward the lower part of the load W, and when the lower end of the load W is reached, the lowering of the carriage 4 is stopped. Then, after winding the film F around the lower end a predetermined number of times (the number of lower windings), the rotation of the arm 3 is stopped. Since the seal bar receiver 104 is in an upright state when the carriage 4 is lowered, the film F wound around the lower end of the load W is
4 (the seal bar 101 side).

Next, the air cylinder 108 is driven to operate the seal bar 101, the nichrome wire 102, and the telescopic clamp 10.
After the arm 3 is raised (FIGS. 6 and 8), the arm 3 is rotated by a predetermined angle in a direction opposite to the direction in which the film F is wound, so that the state shown in FIG. Wrap around the outer periphery of the clamp members 131. In this state, the telescopic mechanism 132 of the telescopic clamp 103
To reduce the distance between the clamp members 131 (FIG. 12 (A) → (B)). Thereby, FIG.
As shown in (1), the film F is folded and folded in a state where it enters between the respective clamp members 131 of the telescopic clamp 103, and the width direction of the film F is reduced to about 1/2. By such processing, the terminal portion (the portion facing the seal bar 101) of the film F is folded evenly in a fold (FIG. 13).

Then, the pusher 106 is driven to move the two seal bars 101 and the nichrome wire 102 to the film F.
(FIGS. 7 and 10), and a terminal portion of the film F folded in a fold shape by the above process is welded to the film F wound on the seal bar receiver 104, and a nichrome wire is welded. At 102, the film F is cut. As shown in FIG. 13, the terminal portion of the film F is welded in such a state that the terminal portion of the film F is folded evenly in a fold shape by such a film terminal treatment. A welding strength twice or more can be obtained.

After the film welding / cutting process described above is completed, the seal bar receiver 104 is rotated in the carry-out direction of the load W (the direction of the arrow in FIG. 4) while driving the conveyor 2 to discharge the load W. Then, the seal bar receiver 104 is pulled out from between the films F, and the film packaging of one package W is completed.

Here, various forms are conceivable as the structure of the telescopic clamp used in the terminal processing device 100. As a specific example, as shown in FIG. 14A, a coil-shaped telescopic clamp 113 in which a clamp material (wire) 113a is spirally wound, or a flexible material such as rubber is used.
A telescopic clamp 123 formed in a bellows shape as shown in the cross-sectional view of FIG.

In the above embodiment, an example is shown in which the present invention is applied to an arm rotating type stretch wrapping machine. In addition, the packaging machine shown in FIG. While being placed on the table 202, the film F
To the side of the load W, and the carriage 204
The present invention is also applicable to a turntable type stretch wrapping machine in which the film F is spirally wound around the luggage W stacked on the pallet by raising and lowering the pallet. In this case, a terminal processing device having the same structure as that shown in FIGS. 4 to 12 is installed on the side of the turntable 202,
What is necessary is just to make it rotate with the turntable 202.

[0038]

As described above, according to the stretch wrapping machine of the present invention, when the stretchable clamps in which the clamp materials are arranged at intervals from each other are arranged in the terminal processing section, and the terminal processing of the film is performed. The width of the film end is reduced to about 1/2, for example, by a telescopic clamp, and welding is performed in a state where the end portion of the film is folded evenly in a fold shape, so that stable welding strength is obtained. Obtained
As compared with the case where the film is welded in a flat state, the welding strength can be obtained about twice or more, and even if the package is stored for a long period of time, the film terminal does not peel off.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an entire configuration of an embodiment of the present invention.

FIG. 2 is a front view (A) and a side view (B) showing a configuration of a film feeding device used in an embodiment of the present invention.

FIG. 3 is a plan view schematically showing the configuration of the film feeding device.

FIG. 4 is a perspective view illustrating a configuration of a terminal processing device used in the embodiment of the present invention.

FIG. 5 is a side view illustrating a configuration of a terminal processing device.

FIG. 6 is a side view showing the configuration of the terminal processing device.

FIG. 7 is a side view showing the configuration of the terminal processing device.

FIG. 8 is a plan view illustrating a configuration of a terminal processing device.

FIG. 9 is a plan view illustrating a configuration of a terminal processing device.

FIG. 10 is a plan view illustrating a configuration of a terminal processing device.

FIG. 11 is a front view illustrating a configuration of a terminal processing device.

FIG. 12 is a cross-sectional view schematically illustrating a main structure of a telescopic clamp of the terminal processing device.

FIG. 13 is an operation explanatory view of the present embodiment.

FIG. 14 is a view schematically showing a modification of the telescopic clamp of the terminal processing device.

FIG. 15 is a perspective view showing a configuration of a turntable type stretch packaging machine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 1 a top beam 1 b base frame 2 conveyor 21 bracket 22 rotation shaft 3 arm 30 arm rotation motor 4 carriage 5 elevating mechanism 50 carriage elevating motor 6 film feeding device 60 film feeding motor 61 feeding roller 62 stretching roller 63 electromagnetic clutch 7 controller 100 Terminal processing apparatus 101 Seal bar 102 Nichrome wire (for film cutting) 103 Telescopic clamp 131 Clamp material 132 Telescopic mechanism 133 Guide bar 134 Compression coil spring 104 Seal bar receiver 105 Moving plate 106 Pusher 107 Rotating stand 107a Support arm 108 Air cylinder (rotation) 109) Air cylinder (for receiving seal bar)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiro Ohira I-1, Yoshiwara-Kamaya-cho, Negami-cho, Nomi-gun, Ishikawa Pref. FD03 JA02 KA03 KA08 KB01 LA02 LA04 LA08 LB03

Claims (1)

[Claims] An image forming apparatus comprising: a carriage on which a feeding roller for feeding a film is mounted; a rotation mechanism for relatively rotating the carriage and a package; and an elevating mechanism for vertically moving the carriage. The film is fed onto the object to be packaged while the carriage and the object to be packaged are relatively rotated, and the carriage is moved up and down to wind the film around the object to be packaged. A sealing device for welding a film end to a film that has been placed, and a telescopic clamp having a telescopic mechanism in which the clamp materials are arranged at an interval from one another along one direction and have a telescopic mechanism for changing the distance between the clamp materials are provided. The telescopic clamp is placed between the sealing device and the film roll when processing the film end. Is the film is wound around the outer peripheral surface of the clamp member, the stretch wrapping machine, characterized in that the spacing of the clamp member is configured so as to reduce the width direction of the narrowed film by stretching mechanism in this state.