JP3353081B2 - Packaging machine film cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine for packaging an article such as a tray container containing an article to be packaged with a stretch film or the like, at an intermediate position between articles supplied in a cylindrically formed film. More particularly, the present invention relates to a film cutting device capable of performing a size change in response to a change in the width of an article.

[0002]

2. Description of the Related Art In a packaging machine of this type, an article supplied in a tubular film is transported downstream while being supported by a pair of side belt conveyors which are movably provided on both sides of the article transport line. It is configured to be. Further, when the width dimension of the article is changed due to an order change or the like, the facing distance between the pair of endless belt conveyors is adjusted by an adjusting mechanism to cope with the change.

In this case, it is preferable that the article is supported by a pair of side belt conveyors until it is conveyed to the downstream side through a tubular film cutting device. It is necessary to adjust the width of the side belt conveyor at the same time according to the adjustment of the interval of the side belt conveyor.

As a cutting device for adjusting the width in accordance with the interval adjustment of the side belt conveyor, for example, Japanese Patent Publication No.
There is one disclosed in Japanese Patent Publication No. -8122. This cutting device is provided on a supporting frame of a corresponding side belt conveyor, and includes a left and right divided film pressing plate and a cutting blade which move downward from above the cylindrical film at the film cutting portion. Are slidable in a superposed state in the width direction. Then, when adjusting the distance between the pair of side belt conveyors, the film press-down plates and the cutting blades are integrally moved and adjusted in the width direction.

[0005]

In the configuration in which the cutting blade is divided to adjust the width, not only the film cutting cannot be performed well in the overlapping portion but also the production cost is pointed out. Further, in the cutting device, since a method of moving the cutting blade up and down at a fixed position (film cutting portion) is adopted, it is necessary to perform an intermittent operation of stopping the side belt conveyor when cutting the tubular film, There is a disadvantage that the operation cannot be speeded up.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been proposed to solve the problem in a preferable manner. It is an object of the present invention to provide a film cutting device of a packaging machine that can be changed in size and that can be operated at high speed by continuous conveyance of articles.

[0007]

[MEANS FOR SOLVING THE PROBLEMS]
In order to suitably achieve the intended purpose, the film cutting device of the packaging machine according to the present invention is configured to form a film drawn from a supply source into a tubular shape around articles supplied at predetermined intervals, and to form the film between the articles. In a packaging machine that cuts a tubular film at an intermediate position and folds the film cut end of the front and rear of the article toward the bottom of the article on the downstream side, the width orthogonal to the transport direction of the article supplied in the tubular film transported and supports the both sides, faces the upper end and a pair of side conveyor belt with a spacing adjustable endless belts according to the width dimension of the article, at a lower position than the lower end of the front Kimutan belt, between the two sides belt conveyors A cutting tool extending in the width direction so as to traverse the article conveying line and moving in the article conveying direction; and a side belt conveyer disposed above each side belt conveyor corresponding to the disposing position of the cutting tool. A pair of cam members, each having an inner diameter cam portion, which are integrally adjusted in accordance with the interval of the bearings, a rotating shaft that rotates along the inner diameter cam portions of the two cam members, and the rotating shaft. And between the two side belt conveyors, and extends in a direction intersecting the article conveying line at a predetermined interval in the article conveying direction, and is superposed in the article conveying direction with the gap adjustment of the cam member. movable cutting guide Toka <br/> Rannahli having a film support piece which moves in the direction, the movable cutting guide, cutting across the tubular film a raised position to permit passage of said article by said cutter The movable cutting guide is set so as to pivot between the possible lowering position and the movable cutting guide moves from the upper position to the lowering position in synchronization with the movement of the cutting tool from the upstream side to the downstream side in the article conveying direction. Swivel and cut A tool is arranged between the film support pieces on both sides in the article transport direction to cut the tubular film.

[0008]

The article covered by the tubular film is continuously conveyed downstream while being supported on both sides in the width direction by a pair of side belt conveyors having endless belts. By a cutting tool that moves in the article transport direction and a movable cutting guide that rotates in synchronization with the movement of the cutting tool, the intermediate position between each article in the tubular film at a position below the endless belt is sandwiched. The film is cut. When the width of the article is changed, the width of the pair of movable cutting guides is integrally adjusted with the adjustment of the interval between the pair of side belt conveyors. That is, when changing the width dimension of the article, it is possible to cope with the width adjustment of only the movable cutting guide without adjusting the width of the cutting tool, so that reliable film cutting can always be achieved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of a film cutting apparatus for a packaging machine according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a stretch wrapping machine 10 employing a film cutting apparatus according to an embodiment is configured to transfer an article 12 (see FIG. 8) such as a tray container containing an article 11 to be wrapped.
An article supply conveyor 13 is provided to convey and supply the film at predetermined intervals toward the downstream film packaging section. Downstream of the article supply conveyor 13 is a supply roll 14 as a supply source.
There is provided a film cylinder device 15 for forming a belt-like film F drawn from the above into a cylindrical shape around the article 12 supplied by the conveyor 13.

The film cylinder device 15 includes a film feed mechanism 76 in which a pair of upper and lower endless belts inclined downward from the upstream side to the downstream side in the article conveying direction are arranged on both sides of the center of the article conveying line, respectively. Each edge of the belt-like film F drawn from the supply roll 14 is sandwiched between a pair of corresponding endless belts and driven to travel, whereby the film F is fed obliquely toward the downstream side. Further, the film cylinder device 15 includes a pair of left and right endless belts that are inclined toward the center of the article transport line from the upstream side to the downstream side in the article transport direction, at a position below the article transport path on the downstream side of the film feed mechanism 76. And a film narrowing-down mechanism 77 disposed on both sides of the center of the article transport line. In the process of nipping each edge in the width direction along the feeding direction of the film F that has passed through the film feeding mechanism 76 with a pair of corresponding endless belts and feeding the film F downstream, both ends of the film F The film F is formed into a cylindrical shape.

[0012] an upper position of the article transport path on the downstream side of the film feed mechanism 76, the opposite widthwise sides perpendicular to the conveying direction of the article 12 covered with tubular film F _1, through the film F ₁ The article 1 is supported and directed downstream.
2, a pair of side belt conveyors 17, 17
Are arranged. This side belt conveyor 17,1
7, between a pair of device frames 18, 19 fixedly arranged on both sides of the center of the article transport line as shown in FIG.
As shown in FIG. 3, a pair of conveyor frames 20, 20 are provided.
Are arranged via a plurality of guide shafts 21 so as to be movable toward and away from each other with reference to the center of the article transport line. A drive pulley 22 and a driven pulley 23 are provided on each conveyor frame 20 so as to be rotatable about a vertical axis.
In between, an endless belt 24 having a vertical transport surface is wound around and runs along the article transport direction. The belt frame 78 is located between the pulleys 22 and 23 of the conveyor frame 20 at a position facing the inside of the endless belt 24.
And the endless belt 24 is attached to the belt frame 78.
A guide plate 75 for supporting the transport surface supporting the article 12 from the back side is provided along the article transport direction.

As shown in FIG. 3, the device frame 18,
19, two right-hand screws on both sides of the center of the article transport line
A pair of adjusting screw shafts 2 formed by threading 5a and left screw 25b
5, 25 are pivotally supported rotatably apart from each other in the article conveying direction. In each conveyor frame 20, female screw members 26, 26 respectively screwed to the corresponding right screw 25a or left screw 25b of each adjusting screw shaft 25 are provided, and the adjusting screw shafts 25, 25 are rotated in reverse. By rotating in the direction, the pair of side belt conveyors 17, 17 are adjusted to move close to and away from each other with reference to the center of the article transport line, so that it is possible to cope with a change in the width dimension of the article 12 due to an order change. ing. In addition, the pair of adjusting screw shafts 25, 25
In FIG. 3, the two screw shafts 25 are connected to each other via a connecting means 27 provided on the left device frame 18. The width is adjusted by rotating in the normal and reverse directions.

[0014] Between the device frames 18 and 19, FIG.
As shown in the figure, the drive shaft 28, which is rotationally driven by a drive motor (not shown) via a suitable rotation transmitting means, rotates in accordance with the position of the drive pulleys 22, 22 disposed on the conveyor frames 20, 20. The drive shaft 28 is freely rotatably supported, and is inserted in a state where the drive shaft 28 is rotatable with respect to the two conveyor frames 20 and 20 and allows the frames 20 and 20 to move in the axial direction (width direction). I have. Each of the conveyor frames 20 is provided with a first bevel gear 29 that is rotationally driven by the drive shaft 28 in a state where the first bevel gear 29 is allowed to move in the axial direction with respect to the drive shaft 28. A second bevel gear 30 that meshes with 29 is connected to the drive pulley 22. Therefore, the pair of endless belts 24, 24 run at a predetermined speed in the article transport direction by rotating the drive shaft 28 in a predetermined direction.

On the downstream side of the film squeezing mechanism 77 in the film cylinder device 15, at a position close to the lower end of the side belt conveyors 17, 17, center rollers 31, 31 (only one of them) are sandwiched on both sides of the center of the article transport line. (Shown). The rollers 31 and 31 hold the overlapping edge portion along the feeding direction of the tubular film F ₁ drawn and formed by the film drawing mechanism 77 on the bottom surface side of the article 12 to adhere thereto, and the side belt conveyor 17. , so as to transfer toward the tubular film F ₁ on the downstream side together with 17.

A film cutting device 34 (hereinafter referred to as a "cutting device") comprising a cutting mechanism 32 and a guide mechanism 33, which are vertically opposed to each other with a horizontal article conveying path interposed therebetween, on the downstream side of the arrangement position of the center rollers 31, 31. arranged also referred to as device ") is configured so as to cut the tubular film F ₁ in the width direction at an intermediate position between the articles 12 and 12 of the tubular film F ₁ by the cutting device 34.

In FIG. 4, a pair of guide rods 35, 35 extending at a predetermined length in the article transport direction are disposed in parallel on the right side of the apparatus frame 19 so as to be vertically separated from each other. A moving body 36 is slidably disposed therebetween. A bracket 37 extends horizontally from the inner surface of the movable body 36 facing the left device frame 18 in a direction intersecting the article transport line.
The holder 38 has a predetermined length along the direction in which the bracket 37 extends.
The cutting blade 39 set to substantially the same size as the
It is arranged below the lower end of the endless belt 24 so as to cross the article transport line with its cutting edge directed upward. The length dimension of the cutting blade 39 depends on the article 1 to be packaged.
The width is set to be longer than the maximum width 2 so that the width of the article 12 can be changed without changing the cutting blade itself or adjusting the width.

A holding plate 49 is provided on the upstream side of the holder 38 in the article conveying direction so as to be vertically movable.
Has a film holding piece 49a bent toward the cutting blade 39 side. The pressing plate 49 is always urged upward by a plurality of compression springs 40 with respect to the holder 38 so that the film holding piece 49 a is
Is set so as to face substantially the same level as the upper end of the cutting edge.
Then, a film support piece group of the guide mechanism 33 (described later)
There when lowered, configured to cut the film F ₁ enters between the cutting blade 39 across the tubular film F ₁ and the pressing plate 49 is pressed around the film support piece group. Further, the upper end position of the cutting tool 79 composed of the cutting blade 39 and the holding plate 49 is positioned at the side belt conveyor 17,1.
The lower end of the endless belt 24 in FIG. 7 faces below and does not interfere with the conveyors 17.

As long as the cutting tool 79 does not move above the lower end of the endless belt 24, a structure for moving up and down, such as rotation and turning, may be added. It is preferable to be configured to face below the lower end of the endless belt 24 and to be positioned below the bottom surface of the article when descending so as not to hinder the conveyance of the article 12.

A support plate 41 is disposed on the outer surface of the right device frame 19, and two shafts 42, 43 are rotatably mounted on the support plate 41 while being vertically separated as shown in FIG. The gears 42a, 43a which are rotatably supported and are disposed corresponding to the lower first shaft 42 and the upper second shaft 43 are meshed with each other. The first shaft 42 is configured so that power from a drive motor 45 is transmitted via a transmission mechanism 46 such as a toothed pulley and a toothed belt, and rotates in a predetermined direction. Further, a lever 47 is disposed at an end of the second shaft 43 extending inward of the device frame 19 so as to rotate integrally therewith,
A cam follower 48 pivotally supported by the other end of the lever 47
Is movably fitted into a vertically extending elongated hole 36a formed in the moving body 36 (see FIG. 5). That is, when the lever 47 is rotated in a predetermined direction by the rotation of the second shaft 43, the moving body 36 is moved by the pair of guide rods 35, 3 under the engagement between the cam follower 48 and the elongated hole 36a.
5, the cutting blade 39 of the cutting tool 79
Is configured to move along the article transport direction while holding the upper end of the blade at a fixed height position.

A pair of thin plate-like cam members 50, 50 are erected on the belt frames 78, 78 corresponding to the position where the cutting mechanism 32 is disposed, and when the interval between the side belt conveyors 17, 17 is adjusted. The interval between the cam members 50, 50 is also adjusted integrally. Each cam member 50 is formed with a circular inner diameter cam portion 50a which is formed with a required inner diameter and penetrates in the axial direction. As shown in FIG. 5, a circular inner cam portion 50a is provided at a portion of the support plate 41 extending above the apparatus frame 19.
Operating shaft 51 whose axis is positioned to correspond to the center of
Is rotatably supported, and a gear 51 a is disposed at an end of the operating shaft 51 extending outward from the support plate 41 so as to rotate integrally therewith. A third shaft 44 rotatably supported by a support plate 41 between the second shaft 43 and the operating shaft 51 is provided with a second shaft 4.
A first gear 44a meshing with the third gear 43a and a second gear 44b meshing with the gear 51a are arranged so as to rotate integrally. That is, by driving the drive motor 45, the operating shaft 51 is configured to rotate in a predetermined direction in synchronization with the second shaft 43 (cutting blade 39) via a gear train.

An arm 52 is provided at an end of the operating shaft 51 extending inward from the support plate 41 so as to rotate integrally therewith. The pair of cam members 5 are positioned at a position separated by a predetermined length from the position of the operating shaft 51 on the arm 52.
A turning shaft 53 commonly inserted through the inner diameter cam portions 50a, 50a at 0, 50 is disposed so as to be rotatable relative to the arm 52. The pivot shaft 53 has a pair of guide rollers 54, 54 that are allowed to move in the axial direction.
As shown in FIG. 6, each guide roller 54 is engaged with the inner diameter cam portion 50a of the corresponding cam member 50 via a peripheral groove 54a formed at the center in the width direction. When the pair of cam members 50, 50 move toward and away from each other in accordance with the adjustment of the distance between the side belt conveyors 17, 17, the pair of guide rollers 54, 54 also move integrally toward and away along the turning shaft 53. (See FIG. 9). Further, the pair of guide rollers 54, 54
Is turned by the rotation of the operating shaft 51, the inner diameter cam portion 5
The guide is moved along 4a and 54a.

A fixed holder 55 is vertically provided at a position corresponding to the center of the article transport line on the pivot shaft 53, and has a film support piece 57a at the lower end of the holder 55, which is spaced apart in the article transport direction and located below. A pair of inverted T-shaped fixed cutting guides 57, 57 are provided. In FIG. 4, a left movable holder 58 is vertically provided inside the left guide roller 54 (on the side facing the center of the article transport line).
0a each having a pair of L-shaped left movable cutting guides 6
0,60 are provided. Further, in FIG. 4, a right movable holder 61 is vertically provided inside the right guide roller 54 (on the side facing the center of the article transport line), and at the lower end of the holder 61,
A pair of inverted L-shaped right movable cutting guides 63, 6 each having a film supporting piece 63a at a lower portion separated in the article conveying direction.
3 are provided. As shown in FIG. 6, the film support piece 57a of the left movable cutting guide 60 corresponding to the film support piece 57a of the fixed cutting guide 57 on the upstream side in the article conveyance direction.
0a is positioned so as to overlap on the upstream side surface, and the corresponding film support piece 63a of the right movable cutting guide 63 is positioned so as to overlap on the downstream side. Further, the left and right film support pieces 60a and 63a are arranged symmetrically with respect to the upstream side with respect to the film support piece 57a of the fixed cutting guide 57 on the downstream side in the article transport direction. And both guide rollers 5
4 and 54 move close to and away from each other along the turning shaft 53, the film support pieces 57a, 57a,
The film support pieces 60a, 60a of the left movable cutting guides 60, 60 and the right movable cutting guides 63, 63 with respect to 57a.
The film support pieces 63a, 63a are configured to slide in a direction intersecting the article transport line in a superposed state.

Even when the two guide rollers 54 are separated from each other in accordance with the maximum width of the article 12 to be packaged, the overlapping state of the fixed cutting guide 57 and the left and right movable cutting guides 60, 63 is maintained. As shown in FIG.
The dimensions of a, 60a and 63a are set. In addition, the film supporting piece 60 in the left and right movable cutting guides 60 and 63
The outer ends of the a and 63a in the width direction (ends separated from the center of the article transport line) are set to be close to the transport surfaces of the corresponding side belt conveyors 17, and are supported by the two conveyors 17, 17 when cutting a film described later. is the configured width direction of the tubular film F ₁ that covers the article 12 may be supported from above over substantially the entire length.

A pressing member 64 is provided on the upstream side surface of the fixed holder 55 so as to face the upstream side of the fixed cutting guide 57.
There is arranged, upon later to film cutting, it presses the tubular film F ₁ of the rear (upstream side) from the film cutting position Gaité
(See FIG. 8), the film cutting end extending from the front end (downstream end) of the rear article 12 functions to prevent the film cutting end from jumping upward after cutting the film.

The guide mechanism 33 includes the pivot shaft 53.
Is provided with a posture maintaining means 65 for keeping the film support pieces 57a, 60a, 63a of the respective cutting guides 57, 60, 63 always downward. As shown in FIGS. 2 and 5, the attitude maintaining means 65 is rotatably disposed on the arm 52 and a revolving gear 66 disposed at an end of the revolving shaft 53 extending outward from the arm 52. The planetary gear 67 meshes with the revolving gear 66, and is disposed and fixed on the inner surface of the support plate 41 so as to mesh with the planetary gear 67, and the operating shaft 51 is rotatably inserted therethrough and the axis of the operating shaft 51 is And a fixed gear 68 whose center is matched. When the arm 52 is turned by the rotation of the operating shaft 51, the turning shaft 53 is moved by the film supporting piece 57 a of each of the cutting guides 57, 60 and 63 under the meshing action of the fixed gear 68, the planetary gear 67 and the turning gear 66. , 6
It is set so as to turn around the axis of the operation shaft 51 while always maintaining the posture in which the reference numerals 0a and 63a are directed downward.

In FIG. 5, the cutting guides 57, 60 and 63 pivot counterclockwise from the uppermost point (tentatively 0 °) along the inner diameter cam portion 50a of the cam member 50 to substantially 90 °. Is set so as to turn from the upstream side to the downstream side in the article conveying direction from the angular position of 270 ° to the angular position of 270 °. And the cutting guides 57, 60, 63 are the lowest points
At the time it reaches the (lowered position), as shown in FIG. 8, configured to cut across the tubular film F ₁ between the cutting guide 57,60,63 and the cutting blade 39. Also when cutting across the tubular film F ₁ between the cutting guide 57,60,63 and the cutting blade 39, cutting blade 39 so as to be positioned between the article carrying direction on both sides of the film support piece group, the cutting blade 39 Of the cutting guides 57, 60, and 63 are set in synchronization with each other. The cutting blade 39
Lowered position of the cutting guide 57,60,63 for cutting across the tubular film F ₁ between may not match the lowest point of the embodiment, the tubular before reaching the lowest point intended to cut across the film F ₁ may be.

[0028] The below the article transport path, the rear of folding the film cutting edge portion extending upstream (rearward) to the article bottom surface from the cutting device 34 in cut the tubular film F ₁ of the article 12 An ear folding device 69 is provided. The rear ear folding device 69 includes a folding conveyor 80 in which a folding bar 71 is provided between a pair of endless chains 70, 70 (only one of which is shown) running in the article conveying direction while being separated in the width direction.
And a suction box 72 disposed downstream of the cutting mechanism 32.
It is composed of The folding conveyor 80 is provided with the cutting device 3.
4 extends from the upstream side of the arrangement position to a predetermined area downstream of the suction box 72, and both endless chains 70, 7
The upper running level of the side belt conveyor 1
It is set below the lower end of the article 12 conveyed at 7,17. That is, the film cutting end extending from the upstream side of the article 12 cut by the cutting device 34,
The folding bar 71 is configured to be folded toward the bottom surface of the article 12 in the process of moving below the article 12 from the upstream side to the downstream side.

A cover member 73 for opening and closing the upper opening 72a of the suction box 72 is provided on the moving body 36 of the cutting mechanism 32. When the moving body 36 moves from the upstream side to the downstream side, the upper opening 72 a is opened by the cover member 73, and the film extending to the upstream side of the article 12 by the negative pressure formed in the suction box 72. The cut end is configured to be sucked down. This prevents the film cutting end from rising upward during film cutting,
The folding by the folding bar 71 is ensured. Further, when the moving body 36 moves from the downstream side to the upstream side, the upper opening 72a is closed by the lid member 73 so that the negative pressure formed in the suction box 72 does not act on the film cutting end. Has become.

A front ear folding device 74 is provided downstream of the rear ear folding device 69, and the side belt conveyor 1
The film cut end extending to the downstream side of the article 12 conveyed at 7, 17 is moved along with the conveyance to the front edge folding device 74.
Is configured to be folded toward the bottom surface of the article.

[0031]

Next, the operation of the film cutting device of the packaging machine according to the above-described embodiment will be described. The film supply device 13 is provided at predetermined intervals by the article supply conveyor 13.
Is continuously supplied to the cylinder making device 1
5 The covered with the tubular film F ₁ to be shaped by extending arguments to contact around the article 12 a strip of film F drawn from a supply roll 14. Each article 12
It is conveyed to the downstream side in the width direction on both sides through a tubular film F ₁ covered in a state of being supported by a pair of side belt conveyors 17 and 17. The edges along the feed direction of the tubular film F ₁ is bonded is pinched by the pair of center rollers 31 and 31 at the bottom side of the article 12.

At an appropriate timing when the intermediate position between the articles 12 in the article transport direction and the article 12 has reached the upstream side of the cutting device 34, the moving body 36 of the cutting mechanism 32 is moved from the upstream side to the downstream side by the drive motor 45. , And the turning shaft 53 turns along the inner diameter cam portions 50a, 50a of the cam members 50, 50. Then, the cutting guides 57, 60, 63 that rotate integrally with the rotating shaft 53,
The film supporting piece 57 is provided by the posture maintaining means 65.
a, 60a, 63a and by turning toward the lowered position from the elevated position while maintaining a posture downward, by sandwiching the tubular film F ₁ is cut in the width direction between the cutting blade 39. At this time, the cutting blade 39 is connected to the cutting guides 57, 60, 6
3 and between the film support piece groups on both sides in the article transport direction, and the upstream film support pieces 57a, 60a.
a, since sandwiching the tubular film F ₁ at 63a and film clamping piece 49a of the holding plate 49, the cutting blade 39
Is more reliably performed.

At an appropriate timing when the cutting guides 57, 60, 63 pivot from the lowered position to the raised position, the endless chains 70, 70 of the folding conveyor 80 in the rear ear folding device 69 travel to move the folding bar. With 71, the film cut end extending to the upstream side of the article 12 is folded into the article bottom side. Until the moving body 36 moves from the downstream side to the upstream side, since the film cutting end is suction-held downward by the suction box 72, the folding by the folding bar 71 is reliably performed. . In addition, the article 12 continuously conveyed by the side belt conveyors 17, 17
The film cutting end extending to the downstream side of the article 12 is folded by the front edge folding device 74 to the article bottom side.

Next, when the width of the article 12 is changed due to the order change, the adjusting screw shafts 25, 25 are rotated in a required direction. As a result, the pair of conveyor frames 20, 20 are adjusted to move closer to or away from the center of the article transport line. In addition, both conveyor frames 20,
The spacing of the cam members 50, 50 disposed on the guide roller 20 is also adjusted integrally, and the guide rollers 54,
54 moves toward and away along the turning axis 53. That is, the left movable cutting guide 60 and the right movable cutting guide 63 disposed on both guide rollers 54, 54 are provided with the respective film support pieces 57a, 60 with respect to the fixed cutting guide 57.
The movement is adjusted with reference to the center of the article transport line while maintaining the superposed state of a and 63a. Thus, it is possible to support the width direction entire length of the tubular film F ₁ for packaging article 12 after the order change from above, can satisfactorily perform the film cutting by the cutting blade 39 in cooperation.

In the embodiment, the cutting guides 57, 60, 6 are set in accordance with the adjustment of the interval between the pair of side belt conveyors 17, 17.
Since the width adjustment of 3 can be performed integrally, the adjustment work is simplified. Moreover, it is not necessary for the width adjustment with respect to the cutting blade 39, it is possible to always reliably cut the tubular film F _1. Further, the cutting blade 39 and the cutting guides 57, 6
The so constructed as to perform cutting of the tubular film F ₁ while moving along the article transport direction 0,63, may correspond to the speed can be continuously transported in the article 12. In the embodiment,
With respect to the film support piece 57a of the fixed cutting guide 57, the film support pieces 60a of the left and right movable cutting guides 60, 63,
Since the 63a is configured to be overlapped on different sides in the article conveying direction, the ends of the left and right movable cutting guides 60 and 63 do not abut when the width is reduced, and the minimum dimension that can be adjusted in width is set to be small. can do.

[0036]

[Modification] In the above-described embodiment, the planetary gear mechanism is employed as the posture maintaining means for maintaining the posture of the cutting guide. However, the rotating shaft is relatively moved to the arm by the wrapping transmission means such as the sprocket and the endless chain. The posture may be maintained by rotating the robot. The cutting tools are
Linear actuators and crank mechanisms, such as independent cylinders, whose speed is set to synchronize with the turning of the cutting guide,
It is also possible to reciprocate by other known mechanisms.

It is also possible to adopt a configuration in which the distance between the article transport conveyors is adjusted by a driving means such as a motor. According to this configuration, the adjustment can be automatically performed based on the data of the set and input articles. The number of divisions of the cutting guide does not need to be three as in the embodiment, but may be two or more. Furthermore, the shapes of the fixed cutting guide and the movable cutting guide are not limited to the examples, and various shapes such as a rectangular shape and a triangular shape can be adopted as long as the shape can maintain the superposed state at the time of adjusting the interval. . Furthermore, each of the holders arranged on the turning shaft and the corresponding cutting guide may be integrally formed.

[0038]

As described above, according to the film cutting apparatus of the packaging machine according to the present invention, the height of the upper end of the cutting tool is set to be lower than the lower end of the endless belt in the side belt conveyor for conveying the articles. Since the cutting tool is set, the width of the cutting tool can be set to a length according to the maximum width of the wrappable article, and the occurrence of cutting defects due to the division of the cutting tool can be prevented. And cost can be reduced. Further, when the width dimension of the article is changed, the size change is completed only by adjusting the cutting guide alone, so that the configuration can be simplified. Further, by dividing the cutting guide into three, the wrappable range of the article can be expanded.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an entire stretch packaging machine employing a film cutting device according to a preferred embodiment of the present invention.

FIG. 2 is a plan view showing the film cutting apparatus according to the embodiment with a part cut away.

FIG. 3 is a front view showing the film cutting device according to the embodiment with a part cut away.

FIG. 4 is a front view showing the film cutting apparatus according to the embodiment with a part cut away.

FIG. 5 is a side view showing the film cutting device according to the embodiment in a longitudinal section.

FIG. 6 is a schematic perspective view of a main part showing a guide mechanism according to the embodiment.

FIG. 7 is a side sectional view showing a main part of the stretch packaging machine according to the embodiment.

FIG. 8 is a side sectional view of a main part of the stretch packaging machine, showing a state in which a tubular film is cut by the film cutting device according to the embodiment.

FIG. 9 is a partially cutaway front view showing a state in which the width adjustment of the film cutting device according to the embodiment is performed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 12 Article 14 Supply roll (supply source) 17 Side belt conveyor 24 Endless belt 50 Cam member 50a Inner diameter cam part 52 Arm 53 Revolving shaft 54 Guide roller 57 Fixed cutting guide 57a Film support piece 60 Left movable cutting guide 60a Film support piece 63 Right Movable cutting guide 63a Film support piece 65 Posture maintaining means 79 Cutting tool F Film F ₁ Cylindrical film

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-56-131128 (JP, A) JP-A-54-90677 (JP, A) JP-A-52-1686 (JP, A) JP-A 58-131 171322 (JP, A) Fully open sho 59-160194 (JP, U) Fully open sho 57-98203 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65B 9/00-9 / 24 B65B 41/00

Claims (6)

(57) [Claims] 1. A film (F) drawn from a supply source (14) is formed into a cylindrical shape around an article (12) supplied at predetermined intervals, and is formed at an intermediate position between the articles (12, 12). tubular film (F ₁₎ by cutting the article in its packaging machine folding the film cut end of the front and rear article article bottom downstream, which is supplied to the tubular film (F ₁₎ in (12) conveying direction and conveyed by supporting the both widthwise sides perpendicular to, an article pair of side conveyor belt with a spacing adjustable endless belts (24) in accordance with the width dimension of (12) (17, 17), before The upper end faces lower than the lower end of the endless belt (24, 24), and extends in the width direction so as to cross the article transfer line between both side belt conveyors (17, 17), and is cut in the article transfer direction. Tool (79), and a side belt conveyor (1) disposed above each side belt conveyor (17) corresponding to the location of the cutting tool (79).
A pair of cam members (50, 50) each having an inner diameter cam portion (50a) formed integrally with the interval adjustment of (7, 17), and inner diameter cams of both the cam members (50, 50). A pivot shaft (53) that pivots along the section (50a, 50a); and both side belt conveyors (1
7, 17), and extends in a direction intersecting the article transfer line at a predetermined interval in the article transfer direction, and overlaps in the article transfer direction with the adjustment of the interval between the cam members (50, 50). The film support piece (60a, 60a, 63a, 63a) that moves in the axial direction in the state
movable cutting guide (60,60,63,63) Toka Rannahli equipped with a), the movable cutting guide (60,60,63,63), said a raised position to permit passage of said article (12) The cutting tool (79) is set so as to rotate between a cutting position that can be cut across the tubular film (F ₁ ) with the cutting tool (79), and the cutting tool (79) moves from the upstream side to the downstream side in the article transport direction. The movable cutting guide (60, 60, 6)
3,63) swings from the raised position to the lowered position, and the cutting tool
(79) are film support pieces (60a, 60a, 63
a, 63a), wherein the tubular film (F ₁ ) is configured to cut the tubular film (F ₁ ). 2. The film supporting piece (60a, 60a, 63a, 63a)
With the movable cutting guide (6
(0,60,63,63)
Item 2. A film cutting device for a packaging machine according to Item 1. 3. The rotating shaft (53) is connected to the inner diameter cam portion (50a).
The movable cutting guide (60, 63) is disposed so as to be rotatable on an arm (52) that pivots about an axis that coincides with the center of the cam, and engages with the inner diameter cam portion (50a). The pivot shaft (5) moves the guide roller (54) to move integrally with the cam member (50).
3) is disposed movably in the axial direction, and the turning shaft (53) turns along the inner diameter cam portion (50a) via the guide roller (54) along with turning of the arm (52), and the gear The turning shaft (53) is relatively rotated with respect to the arm (52) by the posture maintaining means (65) composed of a row, so that the movable cutting guide (60, 6
3. The film cutting device for a packaging machine according to claim 2 , wherein the film cutting device is configured to maintain the posture of (0, 63, 63). 4. A fixed cutting guide (57, 57) provided with a film supporting piece (57a, 57a) is provided between the movable cutting guide (60, 60, 63, 63) on the turning shaft (53). The fixed cutting guide (57, 57) of each movable cutting guide (60, 60, 63, 63) with respect to the film support piece (57a, 57a) of the film support piece (60a, 60a,
The film cutting device of a packaging machine according to any one of claims 1 to 3, wherein 63a, 63a) is configured to be superposed in the article conveying direction. 5. The film support pieces (60a, 63a) of the movable cutting guides (60, 63) on both sides are different from the film support pieces (57a) of the fixed cutting guide (57) on different sides in the article conveyance direction. 5. The film cutting device for a packaging machine according to claim 4 , wherein the film is polymerized. Wherein said cutter (79) is packaging machine according to any one of constituted claims 1-5 to reciprocate along the article conveying direction held constant height position of the upper end Film cutting equipment.