JPH09188303A - Banding method and device for article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a high speed banding by a method wherein a plastic tube is torn along a specified tearing line being formed by a row of holes, which separates an interval between a band and the tube wall, to perform a banding, for a case wherein the band is arranged around an article to be banded. SOLUTION: A floating mandrel 50 in order to open a flat perforated tube, and keep the tube under the opened state, is provided, and the opened tube is fed to the downstream side by a pair of feed rollers 56. In the mandrel 50, a set of top and bottom suspension rollers 58, 59, which are freely rotated, are arranged so as to be confronted with the feed rollers 56. Also, on the downstream side of the feed rollers 56, a tearing roller 62 to tear off a continuous plastic band from the opened tube, is arranged, and the tearing roller 62 is constituted by being equipped with a confronted companion roller 66 in the mandrel 50. The torn band is fitted on an article by a pusher element 84.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method and apparatus for placing a band around an article to be banded, and more particularly from a continuous tube along a predetermined tear line in which the band is perforated. It relates to a method and a device arranged such that the torn and individual bands are accelerated from the mandrel along a floating mandrel facing the article to be banded.

[0002]

2. Description of the Related Art Techniques for tamper-proofing or at least tampering with articles by using banding with a shrinkable plastic film for sealing articles such as bottles, jars, containers, cans and tabs are well known. Such articles are filled with medicines, foods, drinks, cosmetics and the like. Also, a plastic band may be, for example, a bundling of two or more items together, or a coupon, information card, pamphlet, etc., secured to the outer surface of the item at a convenient location for later removal and use by the purchaser. It can also be used for labeling and packaging purposes such as. In packaging operations for efficient article handling, it is desirable to band the articles sufficiently quickly so as to keep up with the speed at which the articles move along the manufacturing line. Also,
Due to the sophistication of production equipment and computer control, the production line has been sped up faster than is conventionally done. These demands for efficiency and high speed require that the banding machine banding the thin band at high speed, separating the band from the tube, and the resulting band in a fast, accurate and reliable manner. It is desirable to be able to place it around the article to be made.

Scheidegger, US Pat. No. 4,497,156, dated February 5, 1985, discloses a machine for intermittently withdrawing a flat tubular sheath by a pair of counter-rotating feed rollers and cutting it into a length of clipping. It is disclosed. In this machine, the sheath, which has been flattened by the original fold in the first longitudinal plane before cutting the clipping from the intermittently withdrawn sheath, has the other longitudinal plane perpendicular to the first plane. Re-flattened and re-scored in P _O to form a sheath that has two substantially flat sides containing the original pair of fold imprints, while being bounded by the second pair of folds. . Each pair of parallel, spaced apart guide members has a V-groove facing the opposite V-groove. The second pair of folds of clipping caused by the re-crease of the sheath wall is the plane P _O.
Is in and is moved along these grooves. These V-grooves gradually deform each clipping so that the sides containing the original folds separate from each other under pressure exerted by the converging V-grooves acting on the second pair of folds. Has a shape that allows the folds of the two to converge with each other. The original fold or fold line begins to reappear and diffuses upon converging the second pair of folds. That is, the re-creased wall of each clipping is substantially flat in the plane P _O when first engaging the V-groove guide member. In this case, the clipping is gradually transformed by the V-groove into a substantially square tip with a generally diamond-shaped trailing edge.

This converging V-groove configuration thereby retains the traces of the original pair of folds, resisting clipping wrinkles and their shape collapse, while at the same time the two sides are converging V-grooves. By two belt runs which are moved apart under the pressure exerted by and which are located on the same side of the plane P _O and therefore engage the trailing edge of the same half of the trailing edge of the clipping lobe. In order to resist wrinkling and its shape collapse under the applied driving force, it is necessary that the re-creased wall of the clipping be relatively thick and resiliently stiff, which results in clipping. Into an unbalanced or asymmetrical push-out engagement with the rear end of the diamond.
To provide the necessary thickness, stiffness and resilience for such clipping, the convergent V-groove machine disclosed in the above U.S. patent uses a plastic sheath having a thickness of at least about 0.102 mm (about 0.004 inch). Is the general method. Such a relatively thick sheath wall consumes a considerable amount of shrinkable plastic and is therefore very expensive.

[0005]

The object of the present invention is therefore to overcome the disadvantages of the prior art.

[0006]

One advantage of using the method and apparatus embodying the invention is that high speed banding can be achieved. In the present invention, a band is torn from a plastic tube along a predetermined tear line formed by an array of spaced holes in the tube wall, the tube wall having a thickness of, for example, about 0.051 mm.
It can be made into a film that is only about (about 0.002 inch), which results in about 0.102 mm (about 0.004 inch)
It does not waste plastic and saves cost compared to an inch) sheath wall thickness, and the torn film band is accelerated to be propelled at high speeds along a floating mandrel facing the article to be banded. And then ejected from the floating mandrel.

The high speed acceleration also causes the band to be propelled relatively downward around the outer surface of the elongated article without the need for each article to reside at the banding station for an extended period of time. Also, the label band, which has a relatively long tubular length, is accelerated by the kinetic energy that the band obtains to propel it down to a position near the bottom of the item without having to spend each item in the banding station for an extended period of time. . According to the invention embodied in a machine in which the articles to be banded are conveyed through a banding station, the individual bands are of length L along the tube.
Of the elongate plastic tubing with evenly spaced lateral perforation tear lines. The perforated tube is flat and it is fed down around a floating mandrel that keeps it open and open.
The feed roller acts as a feed roller that moves the perforated tube downward around the mandrel. A continuously rotating tear roller is arranged at a position spaced a predetermined distance downstream from the feed roller. This predetermined distance is smaller than 2L. These continuously rotating tear rollers pull downwardly on the lower end of the perforated plastic tube, which tears the continuous band moving downwards along the mandrel.

In one embodiment of the present invention, the perforated tube feeding is continuous and the tearing action is faster than the feeding action, thereby allowing the continuous length L of the tube to be traversed in the transverse perforation tear line. It imparts a tearing acceleration to form a continuous band that moves at high speed downstream along the mandrel. In this example of the invention, four continuously rotating endless belts are disposed at substantially symmetrically spaced positions about the mandrel. These belts have elongated protruding pusher elements that are evenly spaced along the belt. In operation, these four pusher elements move through the four regions of the upper edge of each band as they enter and move downstream along the four longitudinal channels provided in the mandrel. It is arranged to push downward at the same time. Thus, these pusher elements propel each band at high speed down the mandrel. The four channels are substantially evenly spaced around the cylindrical lower portion of the mandrel. These pusher elements engage simultaneously with the substantially evenly spaced regions of the upper edge of each circular band (ie, four different quadrants),
Preferably, the stresses are distributed substantially evenly around the upper edge of each band to minimize distortion of the film bands as the film bands are forced downwardly along the mandrel. The pusher element ejects each band from the lower end of the mandrel facing the respective article to be banded. During ejection of each band from the mandrel, the outer ends of the four elongated pusher elements rotate about one axis so that they effectively move faster than the belt and are ejected during the second acceleration. The final kick is transmitted to the band to increase or maintain the kinetic energy of the band facing the article to be banded.

In the banding machine shown as an embodiment of the present invention, a flat plastic tube is continuously fed and perforated near the upstream end of the floating mandrel. The machine can also handle already perforated plastic tubes. In another embodiment of the invention, the perforated plastic tube is delivered in intermittent motion. The tear roller rotates continuously. A continuously rotating accelerating / extruding member (designated as a roller in one embodiment and designated as a belt in another embodiment) is provided downstream of the tear roller. These continuously rotating accelerating / extruding members have a first peripheral speed equal to the peripheral speed of the continuously rotating tear roller and a large second peripheral speed that is twice or more than three times the peripheral speed of the tear roller. Have. The higher peripheral velocity occurs after the band leaves the tear roller, accelerates the band to a high speed moving along the mandrel, and ejects the band from the lower end of the mandrel facing the article to be banded. To do. Thus, the dwell time of the article at the banding station is minimized. That is, the articles are continuously transported relatively quickly through the banding station to achieve high production rates. Also, the rapidly released kinetic energy of the band propels the band to substantially the lower end of the total height of the tall article in which the band is used as a surrounding sleeve label.

Throughout the description and claims, the term "article" means one or more articles to be banded separately or together and to be sealed, banded or labeled, eg bottles, Means any suitable container such as a jar, can, etc. As used herein, the term "mandrel" fits within a plastic tube and functions to keep the tube open and open and to support the tube from the inside, to approximate the shape of the tube to the mandrel. Means a device that matches the shape of. The mandrel preferably has a size slightly smaller than the internal dimensions of the tube and has a smooth surface on which the tube can slide easily. The mandrel also has a surface and an inner roller on which the tube feeding means, the tearing means and the band accelerating means exert pressure to perform their respective functions. The mandrel also prevents the band from breaking or crushing as the band accelerates along the mandrel and is propelled at high speed to eject a relatively thin film-like band toward the respective article. Support the band.

As used herein, the terms "above", "above", "below", "below", "vertical", "vertically", "horizontal", "horizontal" etc. , It is used for convenience of description of the drawings, and is not used with a limited sense. Because the operating components of the machine are mounted on a chassis that can be adjusted in the position shown in FIG. 1, the components described in these expedient terms are not necessarily true vertical (here: , The true vertical direction is the direction perpendicular to the horizontal plane of the earth) or the true horizontal direction.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS The invention and other objects, features and advantages of the invention will be clearly understood from the following detailed description in connection with the accompanying drawings showing the principle of the invention.
The same reference numbers are used for similar components throughout the various drawings. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate preferred embodiments of the present invention and, together with the above general description and the following detailed description, serve to explain the principles of the present invention. Please refer to the drawings for a better understanding of the apparatus and method of the present invention. 1 and 2, reference is made in its entirety to a machine configured to feed a flattened plastic tube 2 from a suitable source, for example a coil or reel, as indicated by arrow 1. It is indicated by the number 10. The tube is passed through guide rollers 3, 4 and a driven feed roller 5, said feed roller 5 being provided by an arm 7 pivotally mounted on a front plate 8 forming part of an adjustable chassis 9 (FIG. 1) described below. It has the supported pressing roller 6 which is supported. The chassis 9 can be angled about a pivot 11 (FIGS. 1 and 2).

The flat tube 2 is passed through a buffer station 12 mounted on the front plate 8 to provide isolation between the tube source 1 and the banding device 20 mounted on the plate 8. The tube runs on two lower rollers 15 supported by a carriage 16 which is free to move up and down along an upper roller 14 (FIG. 3) fixed in position and a fixed vertical guide rod 17. Festooned through the buffer station. The carriage 16 has an upper position shown by a solid line and a lower position shown by a chain line (reference numbers 2 ', 1
5 ', 16' (shown in FIG. 3)). As shown in FIG. 3, after the buffer station 12, the flat tube 2 passes through the guide rollers 18 and 19 and enters the perforator 30 included in the banding device 20. The tube runs upwardly from the roller 19 and circulates about an anvil roller 22 with a smooth surface formed of a suitable hard and durable material (eg, tool steel). The flat tube 2 includes the anvil roller 22 and the driven perforator rotor 2
Drive downward between 4 and. The rotor 24 carries several (six in this example) blades 26 extending parallel to the rotor axis 28 and equidistantly arranged in the circumferential direction. Each blade 26 has a large number of small and sharp teeth that are closely spaced from each other. These blades 26 make a number of small holes in the tube which are transverse tear lines 27 which are perpendicular to the length of the tube and equally spaced along the tube.
(FIG. 3) is formed. The spacing along the tube between successive tear lines 27, and thus the axial length L (FIG. 3) of the resulting band 29, is determined by the diameter of the rotor 24 and the number of blades 26. To change the spacing between the tear lines 27, and thus the resulting band length L, the rotor 24 can be replaced with one having a larger (or smaller) diameter and a larger (or smaller) number of blades 26. The anvil roller 22 is preferably rotationally driven as described below. Perforator rotor 24
As will be described later, the peripheral speed of the tip portion of the blade 26 is substantially equal to the moving speed of the tube 2 provided by the tube feed roller which is arranged on the downstream side of the punching machine and continuously rotates. It is driven to be extremely small.

Shown is an anvil roller position adjusting means 32, which means that the sharp tips of the teeth of the blade 26 are pierced through the two thicknesses of the flat wall of the tube 2 and the anvil roller 22 is shown. Accurately position the cylindrical surface of the anvil roller 24 with respect to the tip of the blade so that it barely contacts the smooth, hard surface of the. For example, the position adjusting means 32 has an adjustable mount 34 supporting the anvil roller 22 and a plurality of adjusting screws 36, each adjusting screw threaded into the perforator chassis 38 and having a locking washer on the chassis. Sit down and fit the appropriate lock nut 37
Are held in their respective correct adjustment positions. The adjustable mount 34 has a pair of sides 33 (only one side is shown in FIG. 3), each side 33 having a wall member 39 (one shown in FIG. 3) of a punch chassis 38. Three wall members 3
(Only 9 is shown) have a pair of parallel edge rims 35 that can slide along grooves.

The perforator 30 adjusts its position along the chassis plate 8 by means of an adjusting screw 40 received in a slot in the wall member 39 so that floating mandrels of various lengths can be attached to the banding device 20. it can. The other wall member 41 (FIG. 1) of the punch chassis 38 is
It is supported parallel to the wall member 39 by a plurality of isolation posts 42 (FIG. 3). A removable shield 44 disposed about the perforator 30 adjacent the post 42 prevents unintentional access to the perforator rotor 24. As can be seen from FIG. 1, the axial lengths of the anvil roller 22 and the perforator rotor 24 are considerably larger in width than the illustrated flat tube to form a larger diameter band if desired. Can be much larger than the width of the flat tube 2 so that it can be handled.

Immediately after being perforated, a flat tube is tangentially drawn from the surface of the anvil roller 22 and a pair of free-rotating guide rollers 45, 46 mounted proximate to the perforator chassis 38 (FIG. 3). It moves downward in the plane P between. The axes of these guide rollers are parallel to the plane P of the downward moving flat tube and with respect to the ridge 47 (FIGS. 5-11) which extends across the top of the wedge-shaped upper end 51 of the floating mandrel 50. Are also parallel. The axial length of these two guide rollers 45, 46 is similar to the reasons mentioned above for the width of the punch, in the ridge 47 so that a fairly wide flat tube can be handled if desired. Larger than the width of the approaching perforated flat tube 2 '(Fig. 3). These guide rollers position the perforated flat tube 2'smooth and close to the plane P in which the ridges 47 are aligned.

As shown in FIGS. 5, 9 and 11, the floating mandrel 50 is formed of any suitable slippery metal or of any suitable material such as Teflon or polytetrafluoroethylene (PTFE). It is coated with a slippery plastic material on which a perforated flat tube 2 '(Fig. 3) such as a plastic film can easily slide. Mandrel taper transition top 51 ridge 47
And the triangular wedge portion 48 (only one shown in FIG. 9) smoothly opens the perforated tube 2'relatively fast as it slides down around the mandrel. . This ridge 47 and wedge 48
Has a shape that allows the perforated tube 2'to smoothly transition from a flat shape to a cylindrical shape. Therefore, the tapered upper end portion 51 of the mandrel 50 preferably has a shape that provides a constant length around its outer circumference at each successive position that descends along the wedge portion 48. This constant perimeter is approximately equal to the perimeter of the inner wall surface of the perforated tube 2 ', in order to allow the tube to slide freely around the mandrel and at the same time support the tube ( However, it is preferable to make it sufficiently small.

Mandrel centerline 51 (see FIGS. 5 and 8).
The plane P extending longitudinally along (most clearly shown in FIG. 3) is the plane of the perforated flat tube 2 '(FIG. 3) moving downwards from the perforator 30. As described above, the ridge 47 is in the plane P. Only one of the two substantially triangular wedge surfaces 48 is shown in FIG. The wedge surface 48 has two edges 49 that are slightly convex when viewed in a direction perpendicular to the plane P, and has a shape of an isosceles triangle in which the edges 49 intersect at a vertex 55. Have. As shown in FIG. 5, when viewed from the direction along the plane P, the two triangular surfaces 48 are symmetrically diffused from the plane P toward the downstream direction and have an opening within a range of about 35 to 40 °. Has a tip angle. As shown in FIG. 1, the open perforated tube is fed down around the mandrel between a pair of freely rotatable mandrel positioning and stabilizing rollers 52 mounted on either side of the mandrel by brackets 53. . One of these mandrel positioning and stabilizing rollers 52 is shown in FIGS.
Only one is shown. Each of these rollers 52 has a freely rotatable counter companion roller mounted inside the mandrel to provide conforming rolling contact with the inner and outer surfaces of the perforated tube 2 '. These rollers 52 are located in rolling contact positions 54 centered on the plane P and at the vertical level of the mandrel which is approximately aligned with the vertical level of the apex 55 of the isosceles wedge surface 48. Therefore, these rolling contact positions 54
Is near the level of the apex 55 at the downstream end of the triangular wedge surface 48 and at the upstream end of the mandrel cylindrical outer peripheral shape 90 (FIGS. 6, 7, 8, 10 and 11). To position.

Mandrel positioning and stabilizing roller 5
Underneath 2, the perforated tube 2'has a pair of continuously rotating feed rollers 56 arranged on either side of the plane P.
Is sent downward around the mandrel 50. These feed rollers 56 can be provided with a rim 57 of a suitable high friction material, for example polyurethane, which can frictionally grip the perforated tube 2 ', or the entire feed roller can be made of such a material. The feed roller 56 presses the wall of the perforated tube 2'slightly inward, as can be seen from FIG. 5, inside the mandrel 50, above and below the transverse plane 6-6 (FIG. 5), etc. Rolling contact is made with a set of freely rotatable upper and lower suspension rollers 58, 59 mounted at intervals. The axis 60 of the feed roller 56 corresponds to the horizontal plane 6-6.
And suspends the floating mandrel 50. In other words, the two feed rollers 56, in cooperation with their respective sets of suspension rollers 58, 59, have the function of suspending the mandrel 50 and of continuously feeding the tube 2'downward around the mandrel. Performs both functions.

As shown in FIG. 3, the rotating shaft of the feed roller 56 is supported by a mounting plate 61. The mounting plate 61 is horizontally adjustable on a second mounting plate 65 which is adjustable by a mechanical screw 67 which engages in a horizontal slot,
This allows the lateral spacing between the feed rollers 56 to be adjusted to accommodate floating mandrels of various diameters and to handle tubes and bands of various diameters. The second mounting plate 65 can be adjusted in vertical position on the front plate 8 by a mechanical screw 69 that engages in a vertical slot, thereby adjusting the vertical distance between the feed roller 56 and the tear roller 62 described below. Thus, it becomes possible to handle bands 29 having various lengths L. The suspension rollers 58, 59 in the mandrel are vertically positioned in proper cooperation with the feed roller 56 with respect to the vertical position of the feed roller 56, as shown in FIG. One way of providing a suitable cooperation between the suspension rollers 58, 59 and the vertically positioned feed roller 56 is to position the vertical position of these suspension rollers 58, 59 relative to the mandrel 50 itself. The mandrel 50 is provided with an adjusting means. Another method of providing proper cooperation between the suspension rollers 58, 59 and the vertically positioned feed roller 56 is to remove the mandrel and use the suspension rollers 58, 59 relative to the feed rollers. Replacing with another mandrel placed in a vertical position.

The perforated tube 2'engages a pair of continuously rotating tear rollers 62 beneath a continuously rotating feed roller 56. The tear roller 62 is
These axes 64 lie in the transverse plane 7-7,
Are located on both sides. These tear rollers 62
Has a rim 63 (FIG. 5) made of a suitable high friction material similar to that of the rim 57 of the feed roller 56. The peripheral speed of the tear roller 62 is more than 3 times the peripheral speed of the feed roller 56, so that the torn band is accelerated to more than 3 times the continuous feed speed of the perforated tube 2 '. . Each of these tear rollers 62
It has a freely rotatable counter companion roller 66 mounted inside the mandrel 50, the axis 68 of which is in the transverse plane 7-7 and is aligned with the inner and outer surfaces of the perforated tube 2 '. Give rolling contact.

As shown in FIG. 11, the continuously rotating tear roller 62 is mounted and keyed to a pair of drive shafts 70 having an axis 64. These axes 70
Is supported by a mounting plate 71 (FIG. 3) which engages within the slot to accommodate mounting of floating mandrels of different diameters for handling tubes and bands of different diameters. The machine screw 72 allows horizontal adjustment on the front plate 8 of the machine chassis 9 (FIG. 1). Two flanged toothed belt drive pulleys 74 are attached and keyed to each shaft 70, with a tear roller 62 disposed between the pulleys 74. Endless toothed belt 76 (FIGS. 3 and 11)
Is positively driven by each toothed pulley 74 and rotates in an elliptical path around the pulley 74 and the idler pulley 78 below. The idler pulley 78 is mounted via a bracket 80 (FIG. 3) so that it can rotate about an axis 79. In each bracket 80, the idler pulleys 78 are arranged on both sides of the plane P and the mandrel 5 is provided.
Mounting plate 7 such that it is located near the lower end 82 of
It extends downward from 1.

As shown in FIG. 11, there are four belts 76, each of which is a plurality of outwardly projecting elongated pusher elements 84 secured to the belt at equal intervals along the belt.
Having. For example, as shown in FIG. 3, each belt is provided with at least three pusher elements 84, as described below.
Preferably, at least one pusher element of each belt is arranged to always move along the elongated channel of the mandrel. These elongated pusher elements 84 are
It projects a substantial distance outward from the outer surface of the belt. For example, the pusher element 84 projects outwardly from the belt by a dimension D that is greater than about 70% of the radius of curvature R (FIG. 11) of the drive pulley 74. The straight descending portion of the elliptical path of each rotating belt 76 moves downwardly adjacent and parallel to the lower portion of mandrel 50. At the bottom of the mandrel 50 are four pusher gap channels 86 extending longitudinally. These channels extend parallel to each of the four downward moving belts.

Elliptical shape shown by the one-dot chain line (FIGS. 3 and 5)
The elongated pusher elements 84 have their respective belts 76
FIG. 7 shows the elliptical path of travel described by the outer end of the element 84 as it rotates with. As these elongated pusher elements 84 pivot about their drive pulleys 74, their outer ends enter the upper ends of their respective clearance channels 86. Thus, the four pusher elements 84 secure the torn band 29 to the cylindrical surface 9 of the mandrel 50.
0 (FIGS. 8 and 11) and simultaneously push downwards at high speed. The mandrel surface 90 effectively supports the fast moving band from being crushed or significantly twisted. Also, these four channels 86
Are substantially evenly spaced about the lower cylindrical surface 90 of the mandrel 50, as best seen in FIG. Thus, as is apparent from FIG. 11, the four elongated pusher elements 84 that enter into and move along these channels 86 are substantially uniform at the upper edge of each circular band 29 (FIG. 3). The four spaced apart areas (ie, the quadrants) and push them downwards. This minimizes distortion of the film-like plastic material in the band that is pushed at high speed down the mandrel toward its lower end 82.

The elongated pusher element 84 has a channel 86.
As it exits the lower end 87 (Fig. 5) of the
As indicated by the curved arrow 89, the idler pulley 78 turns (rotates) around the axis 79. Thus, these pivoting pusher elements 84 move faster than the belt, transmitting the final kick to the band released during final acceleration, thereby transferring the kinetic energy of the band 29 emitted towards the article to be banded. Increase and maintain.
Each of the four idler pulleys 78 (FIG. 5) has a radius greater than the radius R of each belt drive pulley 74 (FIG. 11),
As a result, the turning radius of the tip end portion of the pusher element 84 when turning around the idler pulley is enlarged compared to the turning radius of these tip end portions when turning around the belt drive pulley 74. This enlarged pusher turning radius prevents the undesired kicking motion component in a direction away from the plane P from being added to the upper edge of each band to be ejected, while at the same time the kicking motion in the direction parallel to the plane P is prevented. Allow the downward component to work effectively in the desired downward propulsion direction.

FIG. 3 shows one circular band 29 lowered near the lower end 82 of the mandrel 50 being pushed downwards at high speed by the pusher element 84. FIG. 3 shows another band 2 that has just been torn by the tear roller 62 from the lower end of the perforated tube 2 '.
9 is shown, the band 29 being fed by these tearing rollers 62 to a continuously rotating feed roller 56.
Accelerates downwards to a speed of at least three times the speed transmitted to the tube 2 '. FIG. 3 shows that pusher element 84 pivoting about axis 64 has pusher clearance channel 86 above the upper edge of band 29 which has just been torn.
It shows you are ready to enter. It should be noted that the pusher elements 84 are sufficiently wide spaced along each belt 76 so that only one pusher element on each belt contacts each torn band 29.

Feed roller 56, high speed tear roller 6
The adjustable chassis 9 is provided with drive / transmission means 100, as shown in FIG. 1, for driving the two and the belt drive pulley 74. The drive / transmission means 100, as shown in FIG. 4, comprises an electric motor 102, which rotates a toothed belt drive pulley 104, which drives a double-sided toothed belt 105, Reference numeral 105 denotes an idler pulley 106 and drive pulleys 107, 108, 1 in order.
09 and 110 are driven. The drive pulley 110 is connected via a drive axis 111 to a perforator rotor drive shaft 112 (FIG. 1) on the axis 28 of the perforator rotor 24. A drive disk 115 (FIG. 1) is keyed to the perforator rotor drive shaft 112 to rotationally drive the anvil roller 22 (FIG. 3). The drive disk 115 has a rim made of a high friction material, the rim including the anvil roller 22.
Is in friction drive relationship with a similar rim of a driven disk (not shown) keyed to the shaft of the anvil roller 2
Rotate 2 at the appropriate surface speed.

The drive pulleys 108, 109 have the same diameter and rotate in opposite directions, and each feed roller 56 via the same drive shaft 113 (only one drive shaft 113 is shown in FIG. 1). (Fig. 3),
The feed roller 56 is rotated in the opposite direction at the same circumferential speed around each axis 60, as indicated by the curved arrows in FIG. The peripheral speed of the feed roller 56 is preferably slightly higher than the peripheral speed of the tip portion of the perforator blade 26 for the reason described later. In order to make the peripheral speeds thus slightly different, the feed roller drive pulleys 108, 109 for large diameters of the punch rotor drive pulley 110
The diameter of the feed roller 5 depends on the circumferential distance traveled by the tip of the punch blade 26 in one revolution, and
The rim 57 of 6 is properly selected in relation to the small circumferential distance traveled in one revolution, and the peripheral speed of the feed rim 57 is about 0.03-0.5 from the peripheral speed of the tip of the puncher blade.
The speed difference within the range of% is set to be extremely fast.
This slight difference in peripheral velocity keeps the perforated tube 2'under a slight tension so that it can flow smoothly from the perforator 30 to the feed roller 56 without causing wrinkling problems. Designed to be able to. The resulting slight difference in peripheral speed may be adapted to the unperforated tube 2 sliding slightly forward on the smooth surface of the anvil roller 22, or to the friction drive disc 115 (FIG. 1) of the anvil roller 22. May be adapted.

The drive pulley 107 rotates a gear 114 coaxial with the pulley 107 and having a relatively large diameter. The large-diameter gear 114 meshes with a small gear 116 in a driving engagement state to drive another gear 118 coaxial with the gear 116.
The gear 118 meshes with a companion gear 120 having the same diameter, and the two gears 118, 120 rotate at the same speed and in opposite directions. The gears 118 and 120 have a drive shaft 122 (1 in FIG. 1).
(Only one of which is shown) is coupled to each belt pulley drive shaft 70 (FIG. 11) to rotate the shaft 70 at the same speed and in opposite directions. Adapted for vertical adjustment of the position of the punch 30 for mounting mandrels of different lengths and for horizontal adjustment of axes 60, 64, 79 for mounting mandrels of different diameters. Therefore, the drive shaft 111 and the pair of drive shafts 113,
122 (FIG. 1) has a universal joint at each end of each drive shaft, and each drive shaft is provided with a telescoping length adjustment intermediate section.

Since the bands 29 are spaced along the mandrel by an intervening distance larger than the band length L, the peripheral speed of the rim 63 of the tear roller 62 is set to the feed roller 56.
It is preferable that the peripheral speed is at least 3 times. For example, as shown in FIG. 4, the diameter of the pulley 107 is
It can be equal to the diameter of 8,109. In this case, the diameter of the gear 114 is set to 3.4 times the diameter of the gear 116, and the tear roller 62 is set to the speed of the feed roller 56.
It can be rotated at 3.4 times the rotation speed. Since the diameter of the rim 63 of the tear roller 62 is substantially equal to the diameter of the rim 57 of the feed roller 56, the circumferential speed of the tear roller rim is approximately 3.4 times faster. To drive the tube feed roll 5 (FIGS. 1, 2 and 3), its axis is via an electromagnetically actuated clutch 124 (FIG. 1) and a sprocket / chain connection 126 to the perforator rotor shaft 112.
(Fig. 3). The peripheral velocity of the feed roller 5 is preferably slightly higher than the peripheral velocity of the tip of the punch blade so that the punch 30 can always supply the tube 2 entering it sufficiently. To provide this higher peripheral velocity, the diameter of the feed roller 5 can be made slightly larger than the diameter between the blade tips of the perforator rotor 24, as shown in FIG.

While the electromagnetic clutch 124 is engaged, the tube 2 is accumulated in the buffer station 12 because the feed speed generated by the roller 5 is faster than the tube use speed. During this accumulation, the carriage 16 descends towards its lower position 16 ', energizing the lower position sensor 128 of the control circuit in the lower position 16' and disengaging the clutch 124. While the clutch 124 is disengaged, the withdrawal of the tube from the buffer station 12 raises the carriage 16 towards its upper position, where the upper position sensor 130 of the control circuit.
To engage the clutch 124. Thus, the feed roller 5 and the buffer station 12 cooperate to provide proper feeding of the tube 2 to the punch 30. As shown in FIG. 2, the frame 132 of the machine 10
It has a pair of racks 134 spaced from each other, and the racks 134 have legs for standing the racks 134 on both sides of the article conveyor frame 135. Adjustable carriage 9 (FIG. 1) is supported above article conveyor frame 135 by racks 134 via a pair of pivots 11 attached to both racks 134.
The slope of the carriage 9 is defined by the arcuate slots 1 on both sides of the chassis.
36 and suitable position locking means 138 (FIG. 2) engaging and cooperating with the slot.

The article 140 to be banded is carried on a conveyor 142 (FIGS. 1 and 2). Banding station 144 is a position on conveyor 142 to which lower end 82 of the mandrel is directed. To control the positioning of each article relative to the banding station 144, a timing screw 146 is attached to the opposing guide rail 148.
Work with The conveyor 142 has a timing screw 146.
It moves at a speed somewhat faster than the effective article advancing speed of. Thus, after passing through the banding station 144, the banded articles 140 'released from the timing screws 146 are evenly separated from each other, as shown in FIG. A synchronizer disk 150 (FIG. 4) removably mounted on the same axis 154 as the drive pulley 110 of the punch rotor 24 is provided to control an article handling drive (not shown) that rotates the timing screw 146. There is. This rotating synchronizer disk 150
Is compatible with other similar disks, each disk having a number of equally spaced detection points 152 (six in this case) equal to the number of blades 26 of the punch rotor used. Stationary sensor 156 produces one sync pulse each time it passes each detection point, which are used to control the rotation of timing screw 146 to move each article at banding station 144 to the mandrel. Positioning is performed so as to match the target position of each band 29 discharged from the lower end portion 82.

Adjusting the tilt of the chassis 9 about the pivot 11 adjusts the height of the lower end 82 of the mandrel above the level of the conveyor 142 to accommodate the running of articles 140 of various predetermined heights. And the goal and spacing between the lower end 82 and the top of the article can be optimized.
The band 29 is attached to the article 14 using a pre-perforated tube.
For mounting at 0, the perforator rotor 24 is removed from its drive shaft 112 and from the perforator 30. An infrared source and optical sensor 158 (FIG. 3) can be used to detect the passage of each separated band 29 and to generate a synchronization pulse that causes the timing screw 146 to rotate in a controlled manner. 12 depicts eight successive side views showing a second embodiment of the invention, depicting a repetitive operating cycle that occurs between 0 and 360 degrees. 360 ° at the end of one cycle equals 0 ° at the beginning of the next cycle. For example, as shown in FIGS. 13-15, one complete cycle can be completed in 0.12 seconds and the article 140 can be label banded to obtain 500 banded articles 140 'per minute. The article is advanced toward the banding station 144 by a continuously moving conveyor 142, which conveys
The banded article 140 'is removed from the banding station. The incoming article is controlled by a timing screw (not shown), such as screw 146 shown in FIGS. Releasing each article 140 from the timing screw and allowing it to move with the conveyor 142 correlates with matching the downward feed of each torn band along the mandrel 50. For example, such correlation can be provided by sync pulses from an optical sensor, such as sensor 158 shown in FIG.
A releasable clamp (not shown) momentarily restrains each article aligned with the banding station 144 and dwells the restrained article therein for a time 160 equal to a cycle time of 0 to 120 ° (ie, time). (1/3 of one cycle corresponding to 0.04 seconds).

Another method of correlating the feeding of the band 29 with the articles 140 at the banding station 144 is by the optical sensor 1 detecting each article 140 approaching toward the banding station 144.
59 is to be provided. In this case, the actuation of banding method and apparatus 20 occurs at a timing associated with the arrival of the article as detected by optical sensor 159 as the article approaches the releasable restraint clamp at the banding station. As shown by the plot 162 in FIG. 13, the upper roller (feed roller) 56 starts and stops the feeding. Upper roller 56
Has a diameter of 63.5 mm (2.50 inches) and has a circumference of 199.4
mm (7.85 inches). The activation of these rollers is correlated by the optical sensor 159 with the arrival of each article 140 being conveyed. These rollers are 0-250
Rotating at 437 RPM for a cycle time of °, giving a peripheral velocity of 8,712 cm (3,430 in / min, about 87.1 m / min, about 286 ft / min) per minute, and the perforated tube 2 ' Feed down the mandrel 50 at a feed rate of 87.1 m / min (about 286 ft / min). The control program and the electromagnetic clutch-brake 166 are
From cycle time 0 ° to cycle time 250 °,
The feed roller 56 is operated and stopped up to 250 to 360 °. The DC motor 164 that rotates continuously is
The feed roller 56 is driven via an electromagnetically actuated clutch-brake 166 and a suitable drive shaft 113. Further, the motor 164 continuously drives the middle roller (tear roller) 62 via an appropriate drive shaft 122. 1
There is a pair of drive shafts 113 and a pair of drive shafts 122,
It should be understood that each of these pairs of drive shafts causes the upper roller (feed roller) 56 and the middle roller 62, respectively, to rotate at the same speed and in opposite directions.

The rotational speed of the DC motor 164 can be controlled by adjusting the potentiometer of the DC energizing circuit of this motor. The RPM sensor associated with this motor is
Send the signal to the appropriate RPM display to let the motor 16
The rotation speed at which 4 is operating is displayed to the operator. Plot 168 of FIG. 14 has a diameter of 63.5 mm (2.50 inches) and rotates continuously at 437 RPM, which causes feed roller 56 to feed the tube down during a cycle time of 0 to 250 °. , Feed roller 56
The middle roller (tearing roller) which gives the same peripheral velocity as is shown. As shown in FIG. 12, a cycle time of 60 ° and 1
Between the 20 ° cycle time (ie, about 90 ° cycle time), the lower end of the descending tube 2 ′ has a continuously rotating tear roller 62 (the roller 62).
Causes the feed roller 56 to come into contact (ie, engage) to begin pulling the tube down around the mandrel during the 90-250 ° cycle time. The length L of the label tube between the lateral holes 27 is such that the lower end of the label tube has the accelerating / extruding roller 17 while the tear roller 62 is still engaged.
It is long enough to come into contact (ie, engage) with zero. Also, these acceleration / extrusion rollers 170
Has a diameter of 63.5 mm (2.50 inches) and 120-360 °
During the cycle time of, it rotates at 437 RPM as shown in plot 172 (FIG. 15). Thus, as shown in FIG. 12, the accelerating / extruding roller 170 cooperates with the upper and middle rollers to pull the tube during the 230-250 ° cycle time when tearing occurs as described below. Helps to drive further down around the mandrel. The accelerating / extruding roller 170 is suitably driven in the opposite direction at the same speed by a servomotor 174 via a suitable drive shaft 176 (only one shown in FIG. 12).

As shown by plot 172 (FIG. 15), to control servomotor 174 so that it rotates synchronously and at the same speed as motor 164 during the cycle time of 120-360 °, A shaft encoder 178 is provided on the shaft of the motor 164. This axis encoder 178 is configured such that the servo motor 174 is the DC motor 16 during the cycle time of 120 to 360 °.
The rotation speed of the servo motor 174 is controlled so as to be synchronized with the rotation speed of No. 4 of FIG. With a cycle time of 250 °,
The feed roller 56 is stopped by the clutch 166,
This stops the descent of the tube 2 ', allowing the band 29 to be torn from the tube. The middle and lower rollers both rotate at the same peripheral speed as the previously lowered tube 2 ', so that they cooperate with each other to tear the band 29 from the tube that is currently stopped. . The cycle time of 270 ° is
The band 29 is now shown being torn from the tube 2'and pushed downwards along the mandrel 50 by the co-propelling action of the middle and lower rollers. This co-propelling action by the middle roller and the lower roller is 300 °
Cycle time, and so on until the trailing edge of band 27 passes through the center roller (this is 30
Occurs after a cycle time of 0 ° and before a cycle time of 360 ° (0 °)). Thus, prior to the 0 ° cycle time, the descending label band 29 will only engage the accelerating / extruding roller 170, thereby placing it ready to be accelerated.

At a cycle time of about 360 ° (0 °), the optical sensor 158 (FIG. 12, this optical sensor 158
May be the same as the optical sensor 158 of FIG. 3), which provides a signal that the torn band 29 is now well below its point of contact with the tear roller 62 at its upper edge. Thus, the torn band 29 is free from the tear roller 62 and ready to be accelerated. This signal from sensor 158 causes the control program to increase the speed of the servomotor to a predetermined high speed (eg, 992 RPM in this case), at which speed the servomotor goes from a cycle time of 0 ° to 120 °. Operates up to cycle time. This abrupt increase in roller 170 speed from 437 RPM to 992 RPM results in a peripheral speed of 19,780 cm / min (7,790 inches / min, approximately
197.8 m / min, 649 ft / min), or about 2.27 times faster than the slower speed of roller 170 when synchronized with motor 164. This fast band propulsion speed is 120 degrees from 0 ° cycle time as described above.
Continuing to a cycle time of °, accelerates the long label band 29 and pushes the label band 29 downwards along the mandrel at a rate of about 2.27 times the rate at which the tube is fed. This rapid movement causes the band to be expelled from the lower end 82 of the mandrel, the kinetic energy of which causes the band to move during the dwell time 160 (FIG. 12) of 0.04 seconds into the article 14.
Carried downwards around 0. With a cycle time of 120 °, the servomotor 174 is programmed to operate at a speed controlled by the shaft encoder 178 and operates synchronously with the speed of the DC motor 164.

Within or near the banding station 144, fast reverse counter rotating fabric buff wheels or brushes are provided on either side of the conveyor 142 to band the band so that the label band 29 sits fully down. If it is desired to push down around the wrapped article 140 ', a slight downward friction force can be applied to both sides of the label band after 120 °. Note that there may be two or four accelerating / extruding rollers 170. Each acceleration / extrusion roller 1
70 has one freely rotating counter companion roller mounted inside the mandrel. If four accelerating / extruding rollers 170 are provided, they are spaced substantially symmetrically around the cylindrical outer peripheral surface 90 of the mandrel 50 to provide accelerating stress on the film-like wall of each label band. Are dispersed substantially uniformly.

The present invention is not limited to the embodiments selected for purposes of illustration, as those skilled in the art can implement various other modifications to suit the particular operating conditions and operating environment. All modifications that do not depart from the spirit and scope of the invention as described in the scope of are included.

[Brief description of the drawings]

1 is a side view of a machine configured in accordance with a method and apparatus embodying the present invention.

2 is a front view of the machine of FIG. 1 when looking down toward the input end.

FIG. 3 is an enlarged view of the banding method and apparatus shown in FIG.

4 is an enlarged view of the housing and its components as seen from the direction 4-4 of FIG. 1 with the transmission cover of FIG. 1 removed.

FIG. 5 is an enlarged front view of the same floating mandrel as shown in FIGS. 2 and 3, omitting the plastic tubing of the banding material and the tear band for clarity, with the combined suspension and continuously rotating feed. Rollers, high speed tear rollers and band driven extrusion belts are shown.

6 is a plan view of a cross section taken along line 6-6 of FIG.

7 is a plan view of a cross section taken along line 7-7 of FIG.

8 is a plan view of a cross section taken along line 8-8 of FIG.

9 shows a side view of the same floating mandrel as in FIG. 1, FIG.
It is the side view seen from the right side.

FIG. 10 is a bottom view of the floating mandrel of FIG.

11 is another enlarged cross-sectional view of the mandrel taken along line 7-7 of FIG. 5, showing a continuously rotating high speed tear roller and band propulsion extrusion belt.

FIG. 12: Three different periodic velocity modes for the sequence to achieve fast label banding: (1) Feeding activation and deactivation, (2) Continuous tearing rate equal to feeding rate, (3) Initially continuous tearing. FIG. 6 is a drawing showing a method and apparatus using a three-stage roller to provide an acceleration / extrusion rate that matches speed and then accelerates to a speed greater than twice the continuous tear speed. 1 of operation
A cycle is defined from 0 to 360 °, where 360 ° goes to 0 ° at the start of the next cycle.

13 is a graph showing the rotation speed of an upper roller (feed roller for starting and stopping) among the three-stage rollers in FIG.
3 is a drawing showing plots for one operating cycle of ˜360 °.

14 shows a rotation speed of a middle roller (a tear roller that continuously rotates) of the three-stage rollers in FIG.
3 is a drawing showing a plot for one operating cycle of °.

15 is a drawing showing a plot of the rotation speed of the lower roller (acceleration / extrusion roller) of the three-stage rollers in FIG. 12 for one operating cycle of 0 to 360 °.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube supply source 20 Banding device 22 Anvil roller 24 Perforator rotor 29 Tear band 50 Floating mandrel 56 Feed roller 62 Tear roller 84 Pusher element 128 Lower position sensor 130 Upper position sensor 140 Article

 ─────────────────────────────────────────────────── ————————————————————————————————————————————— Inventor Jaroslav Tea Marcowski Connecticut United States 06611 Tranval Madison Ave 4397

Claims (14)

[Claims] 1. Article (140) with a plastic band (29) torn from a plastic tube (2 ') with lateral holes (27) equidistantly provided along the plastic tube at a predetermined distance L. A device (20) for banding into a flat perforated tube (2 ') which is slidable inside the tube (2') for holding the tube open and open Floating mandrel (50) with a tube (2 ') and mandrel (50) for feeding an open tube (2') downstream along the mandrel.
A feed roller (56) engaged adjacent to the feed roller (56), the feed roller (56) having an axis (60) lying in a first transverse plane extending transversely to the mandrel, Freely rotatable upper and lower sets of suspension rollers (58, 59) mounted inside the mandrel (50)
And the axis of each of the upper and lower suspension rollers is
Located above and below the first lateral plane, a set of suspension rollers (58, 59) are disposed in opposed relation to each feed roller (56) to suspend a floating mandrel and Opposed suspension rollers (58, 5)
The feed roller (56) cooperating with 9) has two functions of suspending the mandrel (50) and feeding the tube (2 ′) around the mandrel, A continuously rotating tear roller (62) located downstream and adjacent to the mandrel (50) for engaging the opened tube (2 ') and for a downstream tearing motion. Tube (2 ')
A tear roller (62) for tearing a continuous plastic band (29) of length L from the open tube (2 ') at the location of the lateral hole (27), The tear roller (62) has an axis (6) lying in a second transverse plane extending transversely to the mandrel (50).
4) and each tear roller (62) comprises a freely rotatable counter companion roller (66) mounted inside the mandrel (50), the companion roller (66) comprising: An axis (6) lying in said second lateral plane in which the tear roller is in rolling contact in register with the inner and outer surfaces of each band (29) to be torn from the tube (2 ').
8) and the torn band (29) with the end of the mandrel (8)
2) from the tear roller (62) to the mandrel (50) along the mandrel (50) to release the banded article (140 ') onto the article (140). The banding device further comprising pushing means (170 in FIGS. 3, 5 and 7 and FIG. 12) that pushes downstream toward the end of the. 2. The flat perforated tube (2 ')
Is a plane P that extends longitudinally along the centerline of the floating mandrel as it approaches the floating mandrel (50).
And having stabilizing rollers (52) mounted therein on opposite sides of the mandrel (50) and centered on the plane P, each stabilizing roller being a tube (2 ') traveling downstream about the mandrel. 2.) Comprising a freely rotatable companion roller mounted inside the mandrel for rolling contact with the inner and outer surfaces of).
An apparatus according to claim 1. 3. The mandrel (50) has a wedge transition end (51), the wedge transition end (51) comprising:
A ridge (47) extending across the mandrel at an upstream end of the mandrel and lying in the plane P, the wedge-shaped transition end (51) being a pair of substantially isosceles triangular surfaces (48); Having a ridge (4)
7) extends downstream, is arranged on both sides of the plane P, and diffuses from one side to the other in the downstream direction, each face has an apex (55), and the two apexes (55) are planes. The stabilizing rollers (52), which are arranged on opposite sides of P on opposite sides of each other, have rolling contact positions (5 in FIGS. 5 and 9) located at a level near the apex (55).
Device according to claim 2, characterized in that it is arranged in 4). 4. Device according to claim 3, characterized in that the wedge-shaped transition end (51) forms a constant distance around it at each downstream continuous position along the transition end. . 5. The feed roller (56) continuously rotates with a rim (57) moving at a first peripheral speed, and the continuously rotating tear roller (62) comprises a lateral hole (27). ) Position, there is provided a rim (63) which moves at a second peripheral speed higher than the first peripheral speed in order to tear the continuous plastic band (29) from the opened perforated tube (2 ′). Claim 1, characterized in that
The device according to any one of 2, 3, or 4. 6. The extruding means (FIGS. 3, 5 and 1)
76, 84) of No. 1 has a continuously rotating toothed belt drive pulley located on either side of the mandrel around which the extrusion belt (76) continuously rotates, the extrusion belt (76) 76) comprises teeth which engage in a positive drive relationship with a toothed belt drive pulley (74), each extruding belt (76) being fixed at equal intervals along the belt and from the surface of the belt. A plurality of outwardly projecting pusher elements (84), said extrusion belt (76) comprising a floating mandrel (50);
Is rotated about a freely rotating idler pulley (78) disposed near a downstream end (82) of the floating mandrel (50) extending downstream along the mandrel (84). ), Each pusher element (84) having a respective channel (8
4) at the same time, pushing the upper edge of each continuous band (29) simultaneously downstream to release the band (29) from the downstream end (82) of the floating mandrel. The device according to. 7. The axis (7) of the idler pulley (78).
9) pusher element (8 in FIG. 5) swiveling around (8)
The outer end of 4) moves faster than the extruding belt (76) to transfer the final release acceleration kick to each band emitted from the downstream end (82) of the floating mandrel (50). The device according to claim 6. 8. The pusher element (84) projects outwardly from the outer surface of each extruding belt (76) by a distance D, which is at least 70% of the radius R of the belt drive pulley (74). The device according to claim 7, characterized in that 9. The idler pulley (78) has a radius greater than the radius R of the belt drive pulley (74) and the tip of the pusher element (84) about the axis (64) of the belt drive pulley (74). Compared to the turning radius of the pusher element (8) around the axis (79) of the idler pulley (78).
4) The turning radius of the tip is increased to increase the desired downstream final release acceleration kick applied to the upstream edge of each band, and at the same time, the external radius applied to the upstream edge of each band. 8. A device according to claim 7, characterized in that it reduces the directional motion component. 10. Apparatus according to claim 6, characterized in that at least one belt drive pulley (74) is attached to each continuous rotary shaft (70) to which the tear roller (62) is attached. . 11. The radius R of the belt drive pulley (74) mounted on each continuously rotating shaft (70) is such that the rim (63) of the tear roller (62) mounted on said shaft.
11. A device according to claim 10, characterized in that it is smaller than the radius of. 12. Two belt drive pulleys (74) are mounted on each of two continuously rotating shafts (70) located on opposite sides of the floating mandrel (50), each shaft having two 11. Device according to claim 10, characterized in that it has a tear roller (62) mounted between the belt drive pulleys (74). 13. The floating mandrel (50) has four channels (86) spaced substantially evenly around the mandrel and four pushers of four respective extrusion belts (76). The element (84) simultaneously enters into each of the four respective channels and moves downstream along the channels to simultaneously provide four substantially equally spaced regions of the upper edge of each band (29). 13. The device of claim 12, wherein the pressing forces simultaneously press each band along the mandrel at high speed while simultaneously producing stresses at substantially equal intervals along the upper edge of the band. 14. A perforation means (30) is arranged upstream of the floating mandrel (50), and the perforation means (30) is provided.
Has a perforator rotor (24) arranged in opposed relation to the anvil roller (22), the perforator rotor (24) having an axis extending transversely to the length of the tube. Rotated about (28), the perforator rotor (24) supports a plurality of perforator blades (26) extending parallel to the axis (28), and all the perforator blades (26) are The tip is at the same uniform radial distance from the axis (28) and the flat plastic tube (2) moves through a portion of the circumference of the anvil roller (22), then the anvil roller, The blade (2) of the rotating perforator rotor (24)
6) by moving it to the tip of the flat perforated tube (2 ') at evenly spaced distances L along the flat perforated tube (2') to form evenly spaced lateral holes (27). The feed roller (56) forms a tube (2 ') when the perforated flat tube (2') moves from the perforation means (30) towards the floating mandrel (50).
A rim (57) moving at a peripheral speed 0.03 to 0.5% faster than the speed of the tip of the punch blade (26) to maintain the tensioned state of the rim. The described device.