JP2000226013A - Packing material carrying device for wrapper machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing material carrying device for which the interval between suction belts and its expansion angle can be adjusted in the state of securely establishing pack transmission lines to a pair of suction belt conveyors, left and right. SOLUTION: A part of pack transmission lines to a pair of suction belt conveyors 4, left and right, is constituted of a packing material carrying device of a wrapper machine, and the device is provided with a pair of spline shafts 36, left and right, allowing the interval adjustment between the suction belt conveyors 4 and free joints 34 connecting the spline shafts 36 with driving side pulley shafts 48 of respective suction belt conveyors 4. Respective suction belt conveyors 4 can be rotated with the free joints 34 as their centers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overwrapping machine for packaging an article to be packaged with a thin packaging material such as a packaging film, and more particularly, to a packaging material conveying device for stably guiding a packaging material to a predetermined position.

[0002]

2. Related Background Art An example of this type of packaging material conveying device is disclosed in Japanese Patent Publication No. 58-10292. This known packaging material transport device includes a pair of left and right suction belt conveyors, and these suction belt conveyors hold a packaging sheet obtained by cutting the packaging material at a predetermined position while adsorbing the packaging sheet as it travels, that is, packaging. The sheet can be fed to the body folding start position.

[0003] Further, in the suction belt conveyor, these intervals are widened in the feeding direction of the packaging material, and as the packaging sheet is fed, the packaging sheet is pulled to the left and right outward with the feeding. Therefore, even if the packaging sheet is a thin film, the pair of left and right suction belt conveyors can stably supply the packaging sheet to its body folding start position without causing the packaging sheet to be slackened.

[0004]

In the case of the above-mentioned known packaging material conveying apparatus, since the left and right suction belt conveyors are expanded, the distance between the suction belt conveyors is considered in consideration of power transmission to the suction belt conveyor. Must be constant and cannot be applied to packaging sheets of various widths.

[0005] Further, since the spread angle of the suction belt conveyor is determined by the circumferential grooves formed on the drive side and driven side belt rollers, respectively, the spread angle is variable according to the material and characteristics of the packaging material. You can't. The present invention has been made on the basis of the above-described circumstances, and an object of the present invention is to reduce the size, material, and characteristics of the packaging material, and to reduce the restrictions on the packaging material transport of the packaging machine, which is excellent in versatility. It is to provide a device.

[0006]

SUMMARY OF THE INVENTION The above object is achieved by the present invention, and a wrapping material conveying device of an upper wrapping machine according to the present invention (claim 1) is a power transmission for transmitting a driving force to a pair of left and right suction belt conveyors. Path, adjusting means for adjusting the interval between the suction belt conveyors while maintaining the power transmission path, and expanding means for expanding the interval between the suction conveyors in the feeding direction of the packaging material. The opening means is provided in each of the power transmission paths, and includes universal joints for rotatably holding the upstream ends of the respective suction belt conveyors in the feeding direction of the packaging material.

[0007] According to the above-described packaging material conveying device, the distance between the left and right suction belt conveyors is adjusted by the adjusting means in accordance with the width of the packaging material. The expansion angles of these suction belt conveyors are adjusted according to the material and characteristics of the packaging material by rotating each suction belt conveyor around a universal joint. Can be implemented independently.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows an example of an overwrapping machine. The overwrapping machine includes a pair of left and right supply conveyors 2 that receive and supply the articles to be packaged A. These supply conveyors 2 consist of horizontal belt conveyors, support both sides of the packaged product A, and convey the packaged product A to the pushing position as it travels.

A pair of left and right suction belt conveyors 4 are horizontally arranged above the supply conveyor 2, and the interval between the suction belt conveyors 4 is wider than the interval between the supply conveyors 2. 1, a film roll R as a packaging material roll is rotatably supported on the right side of the suction belt conveyor 4. A pair of upper and lower feed rollers 6 are disposed between the film roll R and the suction belt conveyor 4 on the suction belt conveyor 4 side. A cutter unit 8 is arranged between the feed roller 6 and the suction belt conveyor 4, and the cutter unit 8 includes a fixed blade and a movable blade.

As the pair of feed rollers 6 rotate, the packaging film F is fed out from the film roll R and guided onto the pair of suction conveyor belts 4 through the cutter unit 8. The wrapping film F that has reached the suction belt conveyor 4 is adsorbed by each suction belt conveyor 4 and is further fed as the suction belt conveyor 4 travels.

When the packaging film F is fed out of the cutter unit 8 by a predetermined length, that is, by a length necessary for packaging the article to be packaged A, the driving of the feed roller 6 is stopped, and at the same time, the cutter unit 8 The packaging film F is cut. By this cutting, a wrapping sheet S of a predetermined length is formed from the wrapping film F, and the wrapping sheet S is sucked by the pair of suction belt conveyors 4 above the above-described pushing position, that is, starts to fold the body of the wrapping sheet S. To the position, after which the feeding is stopped.

On the other hand, the article to be packaged A at the pushing position is pushed from the supply conveyor 2 by the elevator 10 into the pushing line P.
And is temporarily held by the pair of rotation latches 12. At this time, the article to be packaged A passes between the pair of suction belt conveyors 4 and is raised with the packaging sheet S. Note that the rotation latch 12 is disposed above the suction belt conveyor 4.

When the packaged product A is lifted in this way, the packaged product A folds the packaging sheet S by the body folding guide 14 between the rotation latch 12 and the suction belt conveyor 4. As a result, the packaged product A becomes the packaging sheet S
Is partially wrapped. Thereafter, the article to be packaged A is pushed into the packaging line (not shown) from the pair of rotating latches 12, and the packaging line at the subsequent stage, that is, folding of the body flap in the packaging sheet S as is known, The body seal, the folding of the side flaps, and the side seal are sequentially performed, and the packaging of the article to be packaged A is completed.

FIG. 2 more specifically shows the structure of the above-described suction belt conveyor 4, and its support structure and power transmission path. Here, since each suction belt conveyor 4, the support structure, and the power transmission path are symmetrical, the following description will focus on one suction belt conveyor 4 unless otherwise specified. The suction belt conveyor 4 includes a long suction box 16, which extends in the direction in which the packaging film F is fed out, and has a suction chamber 17 therein.
(See FIG. 3). Suction chamber 17
Is connected to a negative pressure source via a suction hose, so that a predetermined suction pressure is constantly supplied into the suction chamber 17. In FIG. 2, the suction chamber 17, the suction hose, and the negative pressure source are not shown.

As viewed in the feeding direction of the packaging film F, a pulley shaft 1 is provided at an upstream end and a downstream end of the suction box 16.
8, 20 are respectively provided penetrating. The pulley shaft 18 at the upstream end is connected to the suction box 16 by a pair of bearings 2.
2 (see FIG. 3), the pulley shaft 20 at the downstream end is attached to a stay 24 of the suction box 16.

A pulley 2 is provided at the inner end of the pulley shafts 18 and 20.
6, 28 are provided respectively. The pulley 26 is fixedly attached to the pulley shaft 18.
Is attached to the pulley shaft 20 via a bearing (not shown). Therefore, the pulley 28 is rotatable with respect to the pulley shaft 20. An endless suction belt 30 is stretched around the pulleys 26 and 28, and the suction belt 30 partially passes through the guide groove provided on the upper surface of the suction box 16. Extends through. A large number of suction holes (not shown) are formed in these guide grooves and the suction belt 30, and the suction belt 3 is formed through these suction holes.
Numeral 0 receives the supply of the suction force, and can adsorb the leading end of the packaging film F and the leading end of the packaging sheet S on its upper surface.

A guide plate 32 is provided downstream of the suction box 16. The guide plate 32 is at the same height level as the suction belt 30, extends along the suction belt 30, and projects a predetermined length from the downstream end of the suction box 16. The guide plate 32 is provided for discharging and receiving the packaging sheet S not used for packaging.

One end of a universal joint 34 is connected to the outer end of the pulley shaft 18, and a spline shaft 36 is connected to the other end of the universal joint 34.
It is connected to. Therefore, the suction box 16,
That is, the upstream end of the suction belt conveyor 4 is rotatable around the rotation center of the universal joint 34 in a horizontal plane.
The spline shaft 36 extends in a direction perpendicular to the feeding direction of the packaging film F, and penetrates the drive ring 37 as shown in FIG. A groove is formed on the inner peripheral surface of the drive ring 37 so as to mesh with the spline shaft 36, whereby the drive ring 37 rotates integrally with the spline shaft 36 while allowing the spline shaft 36 to move in the axial direction. It is possible. The spline shafts 36 of each suction conveyor belt 4 are arranged on the same axis.

A drive sleeve 38 is connected to the drive ring 37, and the drive sleeve 38 is connected to the spline shaft 3.
6 can be guided to guide the movement of the spline shaft 36 in the axial direction. The drive sleeve 38 penetrates the bearing unit 40, and is rotatably supported by the frame 42 of the overwrapping machine via the bearing unit 40. At the outer end of the drive sleeve 38, a gear pulley 44 is mounted via a set screw collar 46. An endless gear belt 48 is looped between the gear pulley 44 and the drive gear pulley.

The drive gear pulleys of both suction belt conveyors 4 are mounted on a common drive shaft (not shown), and this drive shaft receives power from a servo motor (not shown) and rotates in one direction. Therefore, the power of the servomotor is transmitted to the pulley 26 via the gear belt 48, the spline shaft 36, and the universal joint 34, and the suction belts 30 of each suction belt conveyor 4 can run in one direction in synchronization.

L-shaped brackets 50 and 52 are provided on the lower surfaces of the upstream end and the downstream end of the suction box 16, respectively. These brackets 50 and 52 are attached to plate-shaped movable members 54 and 56, respectively. ing. FIG. 4 shows the connection structure between the downstream end of the suction box 16 and the bracket 52 in more detail. A long hole 58 is formed in the bracket 52, and the long hole 58 extends in a direction intersecting the longitudinal direction of the suction box 16, more precisely, along an arc around the universal joint 34 described above. A connection bolt 60 passes through the long hole 58, and the connection bolt 60 is screwed into the lower surface of the suction box 16 to fix the suction box 16 to the bracket 52.

On the other hand, the upstream end of the suction box 16 and the bracket 50 are connected by a similar structure. Therefore, the suction box 16, that is, the suction belt conveyor 4 can rotate about the universal joint 34 by the length of the long hole 58. As a result, as shown exaggeratedly in FIG. 2, the left and right suction belt conveyors 4 are opened so as to expand in the feeding direction of the packaging sheet S, and the spread angle is changed according to the material of the packaging sheet S or the like. It can be adjusted arbitrarily according to characteristics and the like.

The movable members 54 and 56 described above extend vertically, and a screw shaft 62 and a guide shaft 64 penetrate vertically through the lower end of the movable member 54. More specifically, the movable member 54 is screwed with the screw shaft 62 via a direct or indirect screw portion 66 (see FIG. 5), and is slidably supported by the guide shaft 64. Here, with respect to the threaded portions 66 of the left and right suction belt conveyors 4, the screw shaft 62 has threaded portions that are screwed into the threaded portions 66, and the directions of the screws in these threaded portions are opposite to each other. I have. That is, the screw shaft 6
2 has a right-hand thread part and a left-hand thread part, respectively.

The screw shaft 62 and the guide shaft 64 extend below the suction belt conveyor 4 in a direction orthogonal to the feeding direction of the packaging sheet S, and both ends thereof are rotatably or fixedly supported by the corresponding frame 42. Have been. On the other hand, the screw shaft 68 and the guide shaft 70 also penetrate the upper end of the movable member 56 in the same manner, and the screw shaft 68 and the guide shaft 70 extend above the suction belt conveyor 4 in a direction orthogonal to the feeding direction of the packaging sheet S. Extend parallel to each other. Also here, the screw shaft 68 has left and right screw portions, and these screw portions are screwed portions 72 of the left and right movable members 56.
(See FIG. 5).

As shown in FIG. 5, both ends of the screw shaft 68 protrude from the corresponding frame 42, a sprocket 74 is mounted at one end, and a handle 76 is mounted at the other end. . A sprocket 78 is also attached to one end of the screw shaft 62 on the sprocket 74 side.
An endless chain 80 is wrapped around 78.
Incidentally, as shown in FIG.
A sprocket 82 is provided between the sprockets 8, and the sprocket 82 applies a predetermined tension to the chain 82.
The sprocket 82 is mounted on the corresponding frame 42.
Is rotatably supported by a slide plate (not shown), and the slide plate is attached to the frame 42 so as to be vertically movable.

When the screw shaft 68 is rotated by the handle 76, the rotation is transmitted to the screw shaft 62 via the chain 80, and the screw shaft 62 is also rotated in the same direction as the screw shaft 68. The rotation of the screw shafts 62, 68 is performed by moving the movable members 54, 56 on one side of the
At the same time, the movable members 54 and 56 on the other side are moved in the opposite direction along the guide shafts 64 and 70, respectively. That is, according to the rotation direction of the handle 76, the left and right suction belt conveyors 4 come into contact with and separate from each other in a direction orthogonal to the feeding direction of the packaging sheet S, so that the interval between the suction belt conveyors 4 depends on the width dimension of the packaging film F. Adjustable.

Here, the left and right movable members 54 are
4, the above-mentioned left and right spline shafts 36 are guided in the drive ring 37, so that even if the distance between the suction belt conveyors 4 is adjusted, the power to each suction belt conveyor 4 is adjusted. The transmission path is maintained as established. As described above, when the left and right suction belt conveyors 4, that is, the left and right suction belts 30 are in the expanded state, the packaging sheets S on these suction belts 30 are sent out to the body folding start position in the process of being fed. The sheet S is attracted by the suction belt 30 and, at the same time, is pulled outward with a predetermined tension in the width direction. As a result, the packaging sheet S
When has reached the body folding start position, the packaging sheet S is stretched in a stable tension state between the suction belts 30 as shown by the one-dot chain line in FIG. It can be implemented accurately and well.

In this regard, if the center of the packaging sheet S is slackened as indicated by a two-dot chain line in FIG. 7, the packaging sheet S is folded as shown in FIG. Wrinkles B occur, and a shift occurs in the overlapping portion C of the trunk flap as shown in FIG. 9, but such a problem is reliably prevented. The application of tension to the packaging sheet S is determined by the spread angle of the left and right suction belt conveyors 4 described above, and this spread angle can be arbitrarily changed.
It can be adjusted according to the material and characteristics of the packaging sheet S.

The left and right suction belt conveyors 4
Can be adjusted by rotating the suction belt conveyor 4 about the universal joint 34 inserted in the power transmission path to each suction belt conveyor 4, so that this adjustment is performed by power transmission. It is easy to do with the route established. The present invention is not limited to the embodiment described above, and various modifications are possible.
For example, the packaging material conveying device of the present invention is not limited to the upper packaging machine in which the left and right suction belt conveyors 4 are horizontally arranged, and as shown in FIG.
Can be similarly applied to an overwrapping machine in which is vertically arranged. In this case, the folding of the packaging sheet is performed by pushing the article to be packaged A with the pusher 84.

[0030]

As described above, according to the packaging material transporting device of the overwrapping machine of the present invention, the space between the left and right suction belts and the suction belt conveyor can be maintained with the power transmission path to the suction belt conveyor established. Can be adjusted in accordance with the width dimension, material, characteristics, and the like of the packaging material, so that these adjustments can be performed very easily, and a packaging material transporting device excellent in versatility can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view of an overwrapping machine according to one embodiment.

FIG. 2 is a plan view showing the vicinity of left and right suction belt conveyors in the overwrapping machine of FIG. 1;

FIG. 3 is a diagram showing a part of a power transmission path to a suction belt conveyor.

FIG. 4 is a diagram showing a part of a support structure of a suction belt conveyor.

FIG. 5 is a schematic diagram showing an adjustment mechanism for adjusting the interval between the left and right suction belt conveyors.

FIG. 6 is a view showing a chain around FIG. 5;

FIG. 7 is a view for explaining an operation of expanding the suction belt conveyor.

FIG. 8 is a perspective view showing an example of a packaging defect.

FIG. 9 is a perspective view showing another example of a packaging defect.

FIG. 10 is a schematic diagram showing an overwrapping machine according to a modification.

[Explanation of symbols]

 4 Suction Belt Conveyor 30 Suction Belt 34 Universal Joint 36 Spline Shaft (Power Transmission Path) 48 Gear Belt (Power Transmission Path) 50, 52 Bracket (Expanding Means) 58 Slot (Expanding Means) 60 Connecting Bolt (Expanding Means) 54, 56 Movable member (adjusting means) 62, 68 Screw shaft (adjusting means) F Packaging film (packaging material) S Packaging sheet

Claims (1)

[Claims] 1. A pair of suction belt conveyors extending in a direction intersecting with a pressing line of an article to be packaged and sucking and feeding a packaging material fed from a packaging material roll, and power for transmitting a driving force to each of the suction belt conveyors. A transmission path, adjusting means for adjusting the distance between the suction belt conveyors while maintaining the power transmission path, and expanding means for expanding the distance between the suction conveyors in the feeding direction of the packaging material. Wherein the expanding means includes universal joints provided in the power transmission path and rotatably holding upstream ends of the suction belt conveyors as viewed in the feeding direction. Packaging material transport device.