DE2405716A1 - PROCEDURE AND MACHINE FOR IMPACTING OBJECTS - Google Patents

Description

Method and machine for striking objects.

The invention relates to a method and a Machine for hammering objects.

In one aspect, the invention provides a method eum wrapping of articles, in which the articles are displaced at mutual intervals along an article feed path, a partially formed one Wrapping material is formed around each article as it moves along the feed path and organs in the spaces between objects to complete the formation of the covers are introduced around the articles, characterized in that the direction of movement of the objects is changed while the Organs are between the objects.

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There is an advantageous embodiment of the method in the fact that further organs for the formation of the wrapping material become envelopes along a path which converges with the "path" yaws, along which the first-mentioned organs move, and in a cooperating position with the first-mentioned organs be moved, with the wrapping material between the cooperating first-mentioned and further organs are seized and by the organs to envelop the objects be formed · ■ · ''

According to a further aspect, the invention provides a machine for wrapping objects. With devices for moving the objects in mutual At intervals along an article feed path, a plurality of organs for forming "wrapping material" to the Sheaths surrounding objects, and with devices for guiding the organs along a converging path with the feed path Track, characterized in that the feed track has a change in direction and that the organs for Forming the wrapping material into envelopes converge with the feed path prior to the change in direction such that the organs penetrate into the spaces between objects before the objects change direction.

A preferred embodiment is characterized in that the devices for moving the objects Objects before the change of direction in gradual reciprocal It is further preferred that cie called cream has a first section and a second Section on v / eist, the change of direction lying between these sections, the second section in general runs horizontally and the first section is inclined upwards towards the same, and that the organs from above with converge on the material feed path.

A special training is that the

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Means for moving the objects comprise a conveyor with a series of platforms on which the objects are standing, the platforms being arranged in steps and their surfaces after the change of direction lie in the same horizontal plane

It can also be provided that a further plurality of organs and devices for guiding the further plurality of organs are provided along a path which coincides with the path along which the first-mentioned plurality of Organs is displaced, converges in cooperating position with the first-mentioned plurality of organs, the Arrangement is such that the wrapping material is gripped between each pair of cooperating organs and su casings are formed

An embodiment of the machine in which the wrapping material is shrunk on (or -! Any embodiment which uses plastic material) is characterized in that the organs are suitable for severing plastic material and for forming heat-sealed seams on each side of the line _s lengthways which the plastic material is cut Organs of the other plurality form counter bearings against which the organs of the one plurality are pressed.

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An exemplary embodiment of the device according to the invention is explained in more detail with the aid of the figures

1 shows a schematic side view of a machine Wrapping objects in a shrinkable film;

FIG. 2 is a plan view of the sewing machine shown in FIG. 1, with certain upper parts of the machine omitted to provide the assembly below to show;

Fig. 3 shows, on an enlarged scale, a heat seal bar and Figures 4 to 7 partial side views in a larger

Scale showing the sequence of process steps during a sealing process.

The wrapping machine shown is first described in general with reference to FIGS. 1, 2 and 3 and then its mode of operation is explained in detail Referring to FIGS. 4 to 7, the machine shown has an article feed zone 10 and a sealing zone 12 'with a number of articles A is shown during the wrapping process, one after the other at a distance of 1 line of the article feed path Wander through the machine · These items are by means of a top sheet 14 of shrinkable wrapping material fed from a roll 16. as well as a lower foil 18 made of the same material, which is fed from a roll 20, wrapped in, the foils 14 and 18 in the manner described below. Way to be heat sealed together. The objects A. exiting from zone 12 enter a shrink-on tunnel, not shown.

During their passage through the machine, the Objects A one after the other through a row of sliders

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driven carried by a pair of laterally spaced endless chains 24 are also carried and driven by a series of parallel belts 26 and carried by a series of platforms 28. The platforms 28 form part of one indicated generally at 30 endless conveyor, whereby this conveyor rotates at one end around chain wheels 32 and at the other end around further chain wheels (not shown) which are arranged at the end remote from the tunnel notes that the upper run of the conveyor 30 runs through the shrink-on tunnel · The returning lower. · run runs below the tunnel «· .. · ... .

A further conveyor 34 is arranged between the upper and lower run of the conveyor 30, which carries a row of mutually spaced transverse heat sealing bars 36. Above the conveyor 30 is another conveyor 38, which one _k row. of mutually spaced transverse counter bearings 40 fcragfc, which cooperate with the rods 36. The conveyors 34 and 38 are driven by the conveyor 30 ... by means of chains C ′ and the three conveyors are driven in such a way that in the sealing section generally designated 42 in the illustration of FIG move same speed · The. St & be 36 and the counter bearings .40 form organs for transforming the wrapping material into the sleeves surrounding the objects · ....... - ■ -. ·

The film 14 runs from the roll. 16 and is drawn around guide rollers 44. The role. 46 is free to move

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RoIIe ₉ the ends of which can move freely in inclined guides 48 on the inner surfaces of the side plates P of the main frame MF of the machine. The roller 46 is held by the polie 14 which, as can be seen from FIG. 1, passes under this roller.

The film 18 runs from the roller 20 around a guide roller 50, up through the gap between the chains 24 and the row of ribbons 26 and then to the right to join with the top sheet 14.

Each slide 22 generally has an I-shape (see Fig. 2) with one upright and two transverse strips 52 and 54. The opposite ends of the crossbar 52, each Sliders are pivotally connected to the chains 24, as shown schematically at 56 in FIG. The other Cross bar. 54 shows two slide blocks. 58. A head start 60 forms an approach of the upright part of the "X" on the> side of the opposite to the upright part Bar 52 and cooperates with a fixed cam 62 A leaf spring 64 presses down on the upright portion of each slide 22 when those parts of the chains 24, to which this slide is attached, from the lower strands to the upper strands around the chain wheels 66 run ·.

A table 68 extends over the chains 24 and is slotted at 70 (see Fig. 2), the upright portions of the sliders 22 passing through this slot and the blocks 58 on the top. Slide surface of the table * Under the right end of the table 68 is a pair of parallel inclined guides 72 on which the blocks 58 abut when they come from the right end of the

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Table fall off · It will be noted that the guides 72 extend to the left under the chains 24 so that the downward movement of the free ends of the slide limit·

The drive of the chains 24 and a mile 74 to which the straps 26 are pulled by means of chains 76 and 73 from the cross shaft through which the sprockets be worn · Be is important »to note that the Speed at which the belts 26 are driven » is slightly greater than the speed at which the platforms 28 are driven, from one reasons to be explained below.

The conveyor 30 has a series of platforms 28 ₉ on which the articles stand, two laterally spaced chains 80, which are guided around the sprockets 32 as well as the driven sprockets at the distal end of the tunnel at the front end of each platform (the right end _s while it is in the upper run as shown in FIG. 2) on each side thereof a block 82 is arranged, which is pivotally connected to the platform and is firmly connected to a link of the adjacent chain 80 on the rear At the end of each platform there is an outwardly extending arm 84 on either side thereof with a roller 86 at its end. The rollers 86 run on lower guide rails 88 and upper guide rails 90. These guide rails extend around and hold virtually the entire circumference of the conveyor 30 in conjunction with the rollers 86, the rear ends of the platforms in the desired position.

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As can be seen in Figure 2, the platforms 28 are of an open, glass-shaped construction in plan so that they are lightweight and allow the film at the bottom of an object to be heated while the object is in the tunnel. The rear edge of each platform 28 is slotted at 92 so that a plurality of fingers 94 are formed with the slots 92 in alignment with the bands 26. As each platform rises into the sealing section 42, fingers run around the outside of and between the front right ends of the belts 26.

from Fig. Let us see that the guide rails 90 each have a steeply inclined, upwardly extending section 96, a less steeply inclined section 98, a horizontal section 100 in the sealing section 42 and a downwardly inclined section 102 after the sealing section horizontal portions which extend through the heating tunnel and keeping the platforms 26 during its' passage through the tunnel horizontal "IDFC note the path of the chains 80 ₁ which ensures that the rear ends of the platforms, while the rollers 86 upwardly top the running steeply inclined portions 96 of the rails 90, are raised so that the platforms from the steeply inclined position they occupy while the parts of the chains 80 to which they are attached run around the sprockets 32, raised to a horizontal position Then the chains and rails 90 follow substantially parallel paths so that the platforms ho Remaining Rizontal · Therefore, the counter-scan feed path has a number of distinct sections, two of which are particularly important · During

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the passage through the first of these sections the items toward the sealing portion 42 and then change direction and move horizontally through section 42.

The heat seal assembly includes the upper conveyor 38, v / which carries the counter bearing 40, and the lower conveyor ' 34 carrying the heat seal bars. The lower conveyor has a pair of chains 104 which wrap around. Chain wheels 106 are guided, which sit on transverse shafts 108. The bars 36 are carried by the chains 104 and each rod consists of an elongated metal block lid (see FIG. 3), the ends of which are attached to chains 104 are attached, a layer 112 of foam plastic · and a layer 114 of an insulating material, such as Tetrafluoroethylene (Teflon), where "the foam plastic Shaft-shaped between the metal block and the Teflon layer is arranged · A closing block 116, which against the metal block 110 is insulated, is provided at one end of each rod 36 and a plurality of heating wires 118 are on Terminal block 116 anchors and extends the length of the rod HO · The outer wire or wires 118 lie against the Teflon layer 114. The one from the final block 116 distal end of the rod is rounded and the wires extend around the curved surface of the rod to the rear of the same * The rounded shape of the rod end can be achieved by machining the Rod itself can be obtained, if desired, but is preferably done by attaching a rotatable pulley 120 achieved on the rod, the roller having grooves in which the heating wires 118 are guided. On the rear side of the block 110, the wires 118 are connected to coil springs 122, which these wires put under tension and absorb any expansion, which occurs during heating. The second required

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Connection to the wires 118 can be via the screw mounts 122 take place, the other ends of which on a not shown, isolated from the elongated block 110 terminating block are anchored.

The block 110 is wrapped in a film 124 made of a material, v / ie tetrafluoroethylene, in order to direct Touch between all wires except the one in the central heating wire 118 and the shrinkable film. to avoid

The upper conveyor 38 has a pair of laterally spaced apart. Chains 126 on which the opposite Ends of the counter bearing 40 are attached «Each counter bearing consists of a metal rod with a Foam plastic outer surface, with metal rod and Foam plastic is in a height of insulating Material, such as tetrafluoroethylene, are located The counter bearings 40 are guided along a downwardly inclined path, which converges with the upwardly inclined portion of the conveyor 30 from above so that they penetrate into the spaces between the objects.

Chain guides are shown at 128 for chains 104 and at 130 for chains 126. These guides ensure that the upward and downward forces in the sealing portion 42 each on the Rods 36 and the counter bearings 40 are exerted, whereby the required pressure is achieved between these parts will, .

Between the guides 128 (see for example FIG. 4) is a pair of laterally spaced apart,

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parallel touch rods 132 are provided. These rods are arranged between the chains 104 (see Fig. 2} · Two microswitches 134 and 136 are provided to switch the power supply to one of the touch rods 132 on and off · It is to be understood that the other touch rod is neutral The microswitch 134 has an actuating arm 138 which is arranged so that it is actuated by approaching one of the rods 36 to the seal section 42 (see Fig. 4) * The microswitch 136 has an actuating arm 140 which is also arranged in this way is that it is actuated by the rods 36 before each rod 36 emerges from the sealing section 42. Below each rod 36 laterally spaced brackets 142 are arranged and electric shoes 144 are worn by these brackets and shoes are _{not inclined in FIG. 9} 3 * The shoes 144 are arranged in such a way that they rest against the contact bars 132 if they belong This rod 36 approaches the sealing section 42 and detaches itself from the contact rods when the associated rod 36 exits the sealing section. It is noted that the shoes 144 are in contact with the contact rods before the microswitch 134 is actuated and away from the Loosen the contact rods after the microswitch 136 has been actuated »This ensures that no arc discharge occurs»

It should be noted that the microswitches form part of a hold circuit and are not in the main circuit. Therefore, when the Mikrosehalter 134 is actuated ₅ au current is the Heisdrähten of the sealing rod fed and this current is then not disabled, operated until the microswitch 136

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Avoiding confusing details became just one minimum number of reference symbols in FIGS. 5 to 7 inserted · In the same way, one of the sprockets was around which the chains 80 run, in Figures S to 7 shown, but omitted from Fig. 4.

Referring to Figure 4, it is stated that each abutment 40 has an upwardly extending finger 146 and that a laterally projecting fixed stop 148 is provided which extends from the chain guide 130 extends inward · The pinger 146 hits the stop 148 when the counter bearing 40 and the sealing rod 36 begin to separate when they leave the sealing section 42 ·

From Fig. 1 it can be seen that the conveyor 38 is shown in a lower position in full lines and in an upper position in dashed lines are mounted on a subframe SF of the machine "The subframe can be pivoted about the axis of a shaft 154 on which the right chain harvester 150 are mounted." are attached * The connection between the lower frame SF and the piston 158 of the hydraulic cylinder 156 is shown schematically at 160 and is located on the outside of the lower frame Sf * a one-way valve (not shown) is provided in the circuit of the hydraulic cylinder 156, the valve being arranged so allowing hydraulic fluid to flow from the right end of the cylinder to the left end, w hen the piston

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is withdrawn, but prevents flow in the reverse direction. Therefore, the hydraulic cylinder 156 offers little resistance to the movement of the Subframe SP in the upward direction because this causes the piston 158 to retract. However, if the subframe SP is raised, the hydraulic system prevents linder lowering it until the valve is opened by hand »

The front end of the subframe SP carries a pair of Magnets 162 and these magnets work with steel or Iron blocks 164, which are attached to the inside of the main frame MP of the machine «These Magnets, evoke a downward force which is exerted on the front ends of the sub-frame SP «whereby this force and in addition the own weight holds the subframe in the position in which the Conveyor 38 is shown in full lines "

The conveyor 30 'is driven by an electric motor and the circuit of this motor is coupled to the power supply circuit of the sealing bars 36. This ensures that when the conveyor stops moving no more power is supplied to the wires 118 of any sealing bar whose shoes 144 are in System on the contact bars 132 are «

The roller 16 is driven by an electric motor 166 (Pig x l) _r wherein "is actuated on command · '" A microswitch 168 is connected to the floating roller 46 and at the rise of the roll along the guides 48, which means that the Slide 14 is pulled to the right, the microswitch 168 is actuated so that

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the roller 16 is rotated by the motor 166 and further film is made available · The roller 20 is not driven and the film from this roll is simply pulled off, as explained below.

The series of impacted objects A, Al, A2 etc. is placed on the table 68 either by hand or by an automatic feeder the slide 22 moves around the sprockets 66, hits the projection 60 of the same on the cam or the guide curve 62, which causes the end of each slide, on which the cross bar 54 is arranged, suddenly raised so that the blocks 58 rise above the height of the table 68. The leaf spring 64 limits the upward movement of the slide and prevents it from turning over into a backward-facing position Move the slide along the 3 upper run, the slide Block 58 on the table 68 and push the objects A onto the belts 26 in a sequence with the desired spacing «

It is noted that the film 18 is positioned over the tapes 26 and that each object A encloses the film between itself and the tapes. Therefore, it causes movement the object to the right with the tapes pulling the film off the roll 20

When each item A reaches the right end of the belts 26, the fingers of a platform 28 follow up through the straps and lift the item (and the sheet 18 underneath) off the straps * It is understandable that at the point in time at which a platform 28 encounters an object, this platform passes through

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rollers 86 and guide sections 96 and 98 into one horizontal position has been guided (see Pig «1) · The platforms 28 with the objects located on them rise steadily from the belts 26 in the sealing section 42 · When they move from the rising section pass into the seal section, they change their direction to the horizontal, so that now no convergence exists between the article feed path and the path along which the counter bearings 40 are guided, but instead, these paths run parallel to one another through the sealing section 42

Due to the fact that the platforms 28 rise as well as moving to the right, the distance between successive objects would become faster as if the platforms 28 were simply moving to the right · As a result of the slightly faster ones As the belts 26 move, sufficient film will be withdrawn from the roll 20 to compensate for this. It will be noted that the platforms 28 as they climb into the sealing section 42 arranged in steps to each other aind and after Change of direction when entering the sealing section 42 run parallel to the path of the counter bearings 40, with their upper surfaces lie in the same horizontal plane.

The sealing process itself is described below with reference to FIGS. 4 to 7. FIG. 4 shows the Condition immediately after the formation of a seam S between the front edges of the foils 14 and 18 «straight the film wrapped around the object A1 has been separated from the film wrapped around the object A2, the freely movable roller 46 pulls the film 14 back as indicated by arrow 170 in FIG. 4 so that the

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FoXie pulled against the conveying edge of the object A2 will. In FIG. 5, a counter bearing 40 and a sealing rod 36 are on the approach to the sealing section 42 shown, with the counter bearing 40 down into the gap between the object A2 and the following Ge « object A3 (see Fig. 6} has lowered. In the position shown in Fig. 5, the shoes 144 of the approaching Sealing bar 36 to contact point 132 at » placed and the microswitch 134 has then been actuated. Hence the power supply to the heating wires switched on and these wires are preheated in preparation for victory

In the position shown in FIG. 6, the rod 36 and the counter bearing 40 are just coming into a cooperating one Position with the foils 14 and 18 enclosed between them · It is noted that the parts of the chains 104 and 126, on which the counter bearing 40 and the sealing bar 36 are attached, to rest on the guides 128 and 130 come so that it is ensured that the sealing bar and the counter bearing are pressed against each other with the required pressure · In Fig. 7, the rod 36 and the Thrust bearing 40 into a cooperating position, with foils 14 and 18 sandwiched between them so that the sealing takes place · The middle heating wire, which is not covered by the Teflon insulation is, the foils 14 and 18 melts so that separation occurs and at the same time becomes a sealing seam S is formed on either side of the line along which the separation occurs. This way it becomes a shell formed by wrapping material around each item · When the anvil 40 and sealing bar 36 separate (see Fig. 4), the finger 146 hits the stop 148 ''

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whereby the counter bearing 40 a sudden jerky Movement is granted · This ensures that the seam S does not stick to the abutment, which would occur if the film 14 would be pulled to the right, thereby preventing the freely movable roller 46 from sagging Material can pull backwards It can be seen that in the fully resting position (see Fig. 7) the counter bearings 40 are located with respect to the platforms 28 have moved down a height at which their sub " flat approximately in the plane of the surfaces of the platforms, and the bars 36 are immediately below the counter bearing

The conveyors 30, 34 and 33 run continuously and it is in a machine of the embodiment shown possible to ensure that the foils 14 and 18 are relative be wrapped tightly around the objects A, even before the shrinking is carried out. This can be done as a result achieve the fact that the objects A ssum sealing portion 42 rise and the counter bearings 40 to Descend the seal section.

As the conveyor 30 runs through the shrink-fit tunnel, there are always products in the tunnel and as a result it is not possible to stop the main conveyor if an item A is incorrectly placed in the machine and wedged. When this occurs, an upward force is exerted on the sub-frame SF supporting the conveyor 38 and the moment of the upward Force exceeds the downward force given by. the magnets / blocks 162, 164 and by the weight of the Subframe SF is exercised so that the subframe is pivoted upward about the shaft 154 and incorrectly

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When the object is passed through the sealing portion 42, so will the one-way valve of the hydraulic actuator operated so that the Unterrahmeη SP return to its division of operations can.

A layer T of tetrafluoroethylene (see Pig · I) covered the sealing bars 36 as they approach the Sealing Section 42. As explained above, the wires 118 are heated in advance and the layer T prevents premature contact between the hot Wires and the foil.

The retraction arrangement with roller 46 enables "that the machine shown objects with very different sizes without excessive sagging Can handle wrapping process · However, it requires that a period of time be provided in each sealing and severing cycle in which the film is not wedged between a sealing bar and an abutment · From the above it can be seen that during this period of time the retraction arrangement takes effect «As a result, this is the time available during which each sealing rod with the associated counter bearing in cooperating position is quite short and this is one of the main factors for determining the running speed of the machine. On the other hand, if the machine is a so-called "single-purpose machine" is, i.e. is only intended to be used for wrapping objects that cannot be sized to a large extent Should have limits, then the retraction arrangement can be omitted and the sealing portion 42 can thus be expanded be that at any time more than one pair of counter-bearings and sealing bars in mutual contact

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stand and there is always at least one seal tab “counter-bearing comblnafclon engaged” satisfactory sealing is certain to be available standing time increases and the machine can with higher. Run speed.

The machine described so far is used to hammer objects with plastic material, in particular shrink-on wrapping material, but it can do so be modified so that they are used for striking against " stand in paper or other materials is suitable essential to ensure a tight fit of the wrapping material to ensure the item, and those to connect The device provided for both tracks must be modified to adapt to the material. · To be used for Paper, the rods 36 and counter bearings 40 replaced by folder and glue applicators "

The use of two types of locking elements (rods 36 and counter bearing AO) helps to simplify the process

of the machine at «If you wish, however, the SealsSbfe 36 and the associated electrical supply system into the overflow taken by the upper conveyor brought the device lying position and the conveyor 38 can be omitted · In this embodiment. form the front edge parts of the platforms 28 form the counter bearings · This embodiment of the machine is less advantageous} since it leads to a looser wrapping and consequently less economical use of the available material ·

The arrangement shown, in which the platforms

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ascending, then walking horizontally and then descending, results in a very simple design of the machine. However, other arrangements are also possible - for example
the platforms can descend along an inclined path, run horizontally and then rise or lengthways
descend an inclined path, then descend vertically and then along another inclined path, below the
get off the first lying train «This latter sequence can, if expedient, also be reversed · With all of these
possible arrangements, the platforms change their direction after converging with the counter bearings 40 (or the rods 36 if the positions of these parts are interchanged) and then run parallel to them.

If the objects to be impacted have a relatively low profile, it is possible to use a machine
in which the staggered arrangement of the platforms 28 is omitted. With such a machine
a conveyor belt moves up to the sealing area
up, then horizontally and then downwards «Of course
such a band must be provided with openings so that
the rods 36 and counter bearings 40 can interact.

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Claims (1)

Claims c] Method for striking objects _p in which ie objects at mutual distances along a Item feed path shifted, one partially formed envelope of wrapping material around each article as it moves along the feed path is formed and in the spaces between the objects organs aur completion of the training the sleeves are introduced around the articles, thereby characterized in that the direction of movement of the objects is changed while the organs move between the Objects are Method according to claim 1, characterized in that further organs for forming the wrapping material into envelopes are provided along a path which converges with the path along which the first-mentioned organs move and in cooperating position with the first-mentioned organs, whereby the wrapping material sswischen taken the cooperating former and other organs, and are formed by the institutions ^ u covers the articles · 3, method according to claim 2, characterized in that the objects initially move along a first section sloping upward, and change direction to enter a wide section which is generally horizontal, with the first-mentioned organs approach the first section from above and the other organs approach the object access path approach from below, 403834/0348 4. The method according to claim 3, characterized in that a downward sloping section follows the second section 5 · Method according to claims 1 to 4, characterized in that the objects before the change of direction are in a gradual mutual arrangement . β »Process according to claims 1 to 5, characterized in that that the wrapping material is supplied in the form of two webs, the organs separating the webs, while they form sealing seams in front of and behind the parting lines of the panels 7, method according to claim 6, characterized in that plastic material is used as a wrapping material and that the organs the webs in front of and behind the Heat seal the dividing lines of the webs together 8. Process according to Claims 1 to 7, characterized in that that the organs and objects move parallel to each other after the change of direction * 9. Machine for hammering objects, with facilities for displacing the articles at mutual intervals along an article feed path, a plurality of organs for the formation of wrapping material to envelopes surrounding the objects, and with devices for guiding der.Organe along one with the feed track converging path, characterized in that the feed path has a change in direction and that the Organs (40) for forming the wrapping material (14, 18) - 23 40l834 / 0348 BU covers with the feed track before the change of direction converge in such a way that the "organs (40} in the intermediate spaces" wipe objects (A) in front of a row " change of the objects penetrate. ■ 10 «Machine according to claim 9, characterized in that the devices (30) for moving the objects hold the objects (A) in a stepwise mutual arrangement before changing direction 11. Naschine according to claim 9 or 10, characterized in that _t Dafi said web having a first portion and a "wide portion, wherein the change in direction" wipe these portions is, the "wide portion generally horizontaJL verlSuft and the first portion against the same hiri by is inclined above, and that the organs (40). converge from above with the object * feed path « ·. . · 12 »Machine after. Claim 11, characterized in that the “wide section of the article feed path downward sloping third section follows 13. Machine according to claims 10 and 11 or 10, 11 and 12, characterized in that the devices (30) sur shifting the objects have a conveyor with a series of platforms (28)., on which the objects are standing, the platforms (28) being arranged in steps and their surface afterwards the change in direction lie in the same horizontal plane. - 24 - 409834/0348 2405776 14 «machine according to claims 9 to. 13, characterized » therefor a further plurality of organs (36) as well as facilities for the management of the further large number of organs (36) are provided along a path that coincides with the path, along which the first-mentioned number of organs (40) is moved into cooperating Situation with the first-mentioned majority of organs (40) converges, the arrangement being such that the wrapping material (14, 18) between each pair is grasped by interacting organs (36-40) and formed into envelopes * 15. Machine according to claims 9 to 14, characterized in that that the organs (36-40) for separating plastic material and for forming heat-sealed seams (S) are suitable on either side of the line along which the plastic material is cut 16. Machine according to claims 14 and 15, characterized in that that the organs (36) of a plurality each have at least three HeizdrShte (118) ', the Medium wire is suitable for separating the material and the sweeter drifts are suitable for forming the sfiume are, and that the organs (40) of the other plurality form counter bearings against which the organs (36) of the one Plural are pressed 17. Machine according to claims 9 to 16, characterized in that that means for feeding two webs (14, 18) of wrapping material, one over and one under the objects (A), and means (46) for taking up slack of the overhead web ' (14) in the spaces between the shell formation are provided. - 25 - 409834/0348 18. Machine according to the claims. 13 and 14, characterized in that the guide device for the two pluralities of organs (36, 40) guides the organs (40) of the first-mentioned plurality downward with respect to the platforms (28) to such a height that their lower surfaces in the second section are approximately lie in said plane, and the organs of the second plurality (36) lead upwards in such a way that their surfaces lie directly below said lower surfaces. 19. Machine according to claim 18, characterized in that the two pluralities of organs (36-40) form a part of endless conveyors (34, 38) and that the conveyor (38), of which the first-mentioned plurality of organs (40) forms a part, is arranged to be can lift off the second section of the article feed path 20. Machine according to claims 9 to 19, characterized in that that the organs (36-40) are guided so that, after the change in direction, they are parallel to the article feed path to run. 3 / Oe 403834/0348 Blank page