DE2515053A1 - DEVICE FOR FOLDING A RAIL-SHAPED MATERIAL AND FORMING EDGE COVERS THAT CAN BE COMBINED WITH POCKET MANUFACTURING MACHINERY - Google Patents

Description

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6 FraaJ.i ί a.
Paiketi tea 13

8089

UNIFLEX, INC., Westbury, New York 11590, V.St.A.

Device for folding a web-shaped material and forming edge covers which can be combined with carrier bag production machines is.

The invention relates to a device for folding a web-shaped material and forming edge covers with a carrier bag manufacturing machine can be combined, in which a longitudinally folded web of a heat-sealable arcuate Material continuously to a leveling roll assembly moved forward and then intermittently for the execution of the work steps for the production of the carrier bags in the corresponding Rest periods is moved further, with a frame that supports at least one supply roll from the heat-sealable Carries web material and a folding device for continuous longitudinal folding of the web material.

The invention thus relates generally to a machine installation for producing carrier bags from webs of a heat-sealable material Materials, in particular it relates to an edge covering and folding device for such a machine system, which is suitable for the manufacture of numerous specific designs of tote bags without using the existing tote bag making machine needs to change, with which together the device

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is turned.

The manufacture of carrier bags from a heat-sealable arch-shaped Material is usually made by having a substantially continuous supply of a preprinted, heat sealable The panel folds longitudinally to create what will ultimately be referred to as the front wall and the back wall that join together Bottom fold line in each manufactured tote bag. The folded continuous web is made in a carrier bag making machine advanced longitudinally in steps equal to the width of each carrier bag to be made; and past a number of processing stations at which certain operations for the production of the finished carrier bag are carried out e.g. attaching handles, punching out handle openings and the like. Near the end of this gradual Movement of the folded web, the superimposed layers of the longitudinally folded web become hot at the same time sealed and severed transversely to form the side edges or edges of each carrier bag and further each to separate the finished carrier bag from the continuous web.

Machines for making the carrier bags in this manner are commercially available and typically have a relatively large size heavy elongated bed or frame on which the machining components can carry at the corresponding processing stations, which are arranged longitudinally at a distance from each other which corresponds to the width of the widest carrier bag to be produced. The bed also carries various guide rollers for the longitudinally advancing web, drive rollers and compensator roller assemblies, and control systems through which printed characters on the web can be adjusted in relation to the operations at the processing stations.

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■ "3 -

Although such carrier bag making machines have a degree of versatility relating to a particular one of the successive stations along their lengths to be carried out by simply exchanging machining components at the corresponding stations, is the number of stations is limited by the fixed length of the machine bed if one assumes that an expensive one Modification of the basic machine parts should be avoided. In this connection also occur in the production of carrier bags, those with additional layers of sheet material in the form of an envelope or cover along the opposing sides Side of the finished carrier bag opening are provided, problems, especially when such carrier bags with other elements, e.g. carrying handles or handle punch-outs or the like will. The attachment of such an envelope or cover to the edges of the sheet material in the carrier bag making machine e.g. requires a reciprocating heat sealing device, which takes up longitudinal space in the machine, which is at least equal to the total width of the to sealing carrier bag and must be adjustable to each different width of the carrier bag to be produced. There also two superimposed but separate longitudinal ones Welds or seals must be carried out around the envelopes or covers on the now superimposed To attach the front and back walls, some shielding must be done. Device between the separate layers of the heat sealable Web can be provided in the formation of an envelope or cover of this type. The length of the material career that is required to make a fold in the tote bag making machine also occupies at least the space of a complete one Processing station.

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To date, these problems have posed considerable problems to the carrier bag manufacturer Caused costs, either for the purchase of specialized carrier bag manufacturing machines, which are relatively close Areas of different carrier bag constructions can be adapted, or for extensive modifications of the basic ones Carrying bag manufacturing machine or for the production of double track tracks by the carrier bag manufacturing machine through or for combinations of these expensive and time consuming solutions. There is obviously a considerable need, therefore in this field for a relatively inexpensive solution to the problem, existing carrier bag manufacturing machines to make suitable or to adapt accordingly for a larger range of types of carrier bags and constructive configurations.

The present invention is therefore based on the object of a new, high-performance and versatile envelope production and To create web folding device for carrier bag manufacturing machines, in which device all operating components for adjustment purposes, for the maintenance and threading of the web-shaped Materials should be easily accessible. The device should also take up minimal floor space for its installation be inexpensive and so versatile that they can be used for a wide range of special carrying bag designs or designs suitable is.

This object is achieved by a device which, according to the invention, is characterized by a number of parallel devices Guide rollers which are stored in the frame and arranged in front of the folding device so that between the supply roll and the A loop-like path is formed for the unfolded sheet material, the loop-like path first and second moving portions of the web material comprising an edge covering device disposed on the frame along the first moving portion of the web material by at least one additional layer of heat sealable sheet material

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continuously on at least one side edge of the web material to be applied by heat sealing devices pivotably mounted on the frame along the second movement section of the web material, the additional layer of the sheet material with the web material during the continuous movement of the web material and merging the additional layer in the second moving portion of the loop-like path by automatic drive devices for the heat sealing devices to move them away from the Pivot away web material when the movement of the web material along the loop-like path is interrupted, and by a guide device, which is connected downstream of the folding device and which directs the folded, edge-capped web to the carrier bag making machine.

Accordingly, according to the present invention, there becomes a high performance and relatively inexpensive apparatus for conventional carrier bag making machines of the above-mentioned type, through which a variety of carrier bag opening edge designs can be carried out without requiring more than routine modification of the carrier bag manufacturing machine. The device is essentially formed by a structure supported on a frame with suitable guide rollers, the forming a looped series of movement sections in the unfolded web which is sandwiched between a web supply roll or rolls and the longitudinal folding horn, which is usually provided in the outlet of the web to the carrier bag making machine will. While the web is continuous through the loop-shaped Moving sections is moved forward, an additional cover or envelope layer of a heat sealable Material is applied to one or both of the opposite edges of the web and immediately heat-sealed in a subsequent section of movement of the loop before the web is passed over the Falthorn or the folding mandrel that runs the longitudinal web folding causes before the entry of the web into the carrier bag manufacturing machine. The additional cover layer can be in the form of a

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unfolded separate strip, a folded envelope in the continuous web itself, or an independent cover strip which is folded around the edge of the web. When choosing in a special form of cover must all that is required is the correct initial insertion of the material and the adjustment of the device for a To match the lateral dimensions of the material used.

The frame construction of the device consists of two on trestles supported vertical supports with cross members or guides, which extend between the supports and are adjustable various supply roll bearings of heat sealable material, carry the cover splitters and heat sealers. The heat sealing devices used in the machine consist of two elongated heating wires on each side of the unfolded sheet, with each heating element being pivotable is held to facilitate movement to a closed position in which the wires are in operation close together lying on the web or pivoted away from the web in order not to exert any heating effect on the web. It is also a control system provided by which the heating elements are automatically withdrawn from a heating position with respect to the web when the Railway stopped for some reason.

The invention will now be described in detail with reference to the accompanying figures described, with all details or features emerging from the description and the figures for solving the Task within the meaning of the invention can contribute and were included in the application with the intention of being patented. Show it:

Figure 1 is a side view of the edge folder and web folder according to the present invention;

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Figure 2 is a front view of the device shown in Figure 1;

Fig. 3 is a rear view of the device shown in context with the infeed of a conventional tote bag making machine;

Fig. 4 is an enlarged partial cross-sectional view taken along line 4-4 of Fig. 2;

Fig. 5 is an enlarged partial cross-sectional view taken along line 5-5 of Fig. 2;

6 is an enlarged partial perspective view of a cover strip folding mandrel in the device according to the invention;

Figure 7 is an enlarged partial cross-sectional view taken along line 7-7 of Figure 4;

8 is a partial cross-section taken along line 8-8 of FIGS

9 to 12 partial perspective views of various designs from carrier bag opening constructions, to their Manufacture the device is suitable.

Detailed Description of the Preferred Embodiment

The edge cover and shown in Figures 1 to 3 of the drawing Contains web folder according to the present invention a frame structure, indicated generally by the reference number 10 is. This frame construction consists of a lower part or bracket 12 and two essentially vertical or lowering

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right supports 14 and 16. The supports 14 and 16 are "structural connected to each other by transverse beam-like components, which are then identified in connection with the operating elements and supported by these components.

Cantilevered forwardly, vertically spaced sets of roller support arms 18, 20 and 22 extend from the supports 14 and 16, each such set of arms forming at least two bearing points for rolls of thermoplastic sheet material, which is used for the tote bag manufacturing operations. In the illustrated embodiment and as in FIGS. 1 and 2 As shown, arm sets 18 and 20 each carry a web supply roll 24 and 26, the rollers being supported on central shafts 28 of the same type. It should be noted that usually two supply rolls of the strip-shaped material are used to produce carrier bags with twice the plastic material thickness, the web forming the outer layer, which is printed with corresponding characters or images, supplied from the roll 26 whereas an inner layer or slip layer is created by the web supplied from roll 24. In In practice, the two lanes are laid one on top of the other and then continued as a single lane in the work sections that for the device according to the present invention and in the carrier bag manufacturing machine. At this point it should be noted that making a carrier bag without double thickness of plastic material or without a liner requires only one set of arms 18 or 20 required to feed single thickness sheet material,

The roller support shafts 28 protrude axially from their respective ones Rollers 24 and 26, which are supported on these shafts, protrude so that the opposite ends of each shaft 28 on two spaced pairs of rollers 30 are rotatably supported, which in turn are mounted near the upper edge of the support arms. At the one end of each shaft 28 which protrudes beyond the arms carried by the support 16 is a coil-like ring 32 with

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two flanges attached, which is in engagement with an axially adjustable Positioning slide 34 can be brought, which is mounted on cylindrical guides 36 which are attached to the support 16 are attached. Each slide 34 is connected to a hydraulic piston 37 which, under the control of an electrically operated Valve 38 is operated. The function of the carriage 34 and the associated components is the individual Rollers 24 and 26 with respect to a predetermined vertical reference plane between the supports 14 and 16 under the control of known art Position edge position sensors or sensors (not shown) located downstream from rollers 24 and 26 in sections of the web runway are positioned.

Arm set 22 similarly supports two cover strip supply rolls 40 and 42. In the event that two independent cover strip supply rolls are to be used, each Roll supported on an independent V / elle 44, which is rotatably held at its outer end by the arms 22 and at their inner end in each case by arms 22a, which in turn are carried by a carrier 46 which extends between the supports 14 and extends (see. Fig. 2!). The outboard end of the shafts 44 carries axially fixed shafts like the shafts 28 described above Rings 48 with two flanges which come into engagement with slides 50 for axial movement, in the manner of a traveling Nut on an adjusting spindle 52 work. It can now be seen that in this arrangement by rotating the spindle 52 the axial or transverse position of the ring 48 and thus the roller 40 is determined. The role 42 is otherwise similar Devices equipped that their axial or transverse position with respect to a central vertical plane between the supports 14 and 16 set.

In order to properly understand the construction and operation of the present invention, it should be noted that conventional operations for making wire bags

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in the continuous withdrawal of a web from a supply roll, e.g. from one or both supply rolls 24 and 26 via a longitudinal folding mandrel into the wire bag manufacturing machine, at which point the continuous longitudinal advancement of the longitudinally folded web into an intermittent one longitudinal feed process is converted. Referring to Figure 3 of the drawings, the lead-in is a conventional carrier bag making machine 54 shown, which includes an electric motor 56 or any other suitable rotary drive, which with a continuous rotatable drive roller 58 is connected, around which a loop or part of the longitudinally folded web ¥ is wrapped around, which is thereby continuously moved forward in the longitudinal direction at speeds that the production speed correspond to the carrier bag manufacturing machine. Down-web in terms of web travel are one or a plurality of intermittently driven drive rollers (not shown) arranged through which the web advances in steps becomes successive carrier bag production stations that are attached to the machine. The transformation of the continuous Advancement by the drive roller 58 in an intermittent advance in the above manner is made possible by a Set of leveling or compensating rollers 60 supported on an arm 62 which is biased by a spring or weight and can swing around a bearing point 64. As is known in the art in question, such leveling rolls serve to this, a longitudinal segment of the continuously conveyed web section during the rest periods in the intermittent to catch the conveyed web section downstream from the compensating rollers. Also in accordance with normal practice the longitudinal folding of the web W is achieved by moving a web downwards away from a horizontally stored supply roll pulls a V-shaped folding mandrel or a folding mandrel. As shown in Fig. 1 and 3 of the drawings is the longitudinal track folding horn formed in the embodiment by two round rods 66, which between the back of the bracket 12 and the supports 14 and

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are held. The rods 66 are arranged so that they in a Plane which is inclined at about 45 ° with respect to the supports 14 and 14, and they run at their lower ends in the vicinity of one Guide roller 68 from which the now folded web is guided to the drive roller 58. While the merged and When the longitudinally folded web is pulled off the supply rolls 24 and 26, a certain tension is created in the web by braking strips 70 maintained, which are carried by rods 72 and placed over each roll of sheet material. The brake lines are made of any suitable textile material such as cotton fabric or the like and have rods 74 attached to them hanging ends to ensure a correct braking value.

The path of movement through which the web material is drawn in the device according to the present invention becomes substantial formed by a number of freely rotating, parallel guide rollers, which extend transversely between the supports 14 and 16. As can be seen from Figure 1 of the drawings, the web material consequently runs from the lowest supply roll 24 around a guide roller upwards over a guide roller 78, around which the Web is guided from the supply roll 26, which is placed on the web from the supply roll 24 in this way. The superimposed or double-ply web runs up from roller 78 past a guide roller 80 over a cover folding horn 82 which will hereinafter be described in detail, and then to a guide roller 84 which is near the top of the supports 14 and 16 is positioned. As the web passes from the guide roll to the cover switch horn 82 over the guide roll 80, the web is slightly reversed, so that in the event that edge strips are used, those from the supply rolls 40 and 42 come here, placed on the opposite edges of the double-layer web and pressed against this, which of the Rolls 24 and 26 comes from. The composite web W then moves away from the guide roll 84 over the top of the apparatus

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guided a guide roller 86 and then in a straight line Moving section down to a guide roller 88. After the web has passed the guide roller 88, it will follow diverted inside and below around two guide rollers 90 and 92 and then over the folding bars 66, as already described above became. It can thus be seen that the web material during its run from the supply rolls 24, 26, 40 and 42 to the folding bars 66 is inevitably brought into a vertically oriented loop-shaped shape, which one upwards directed or running and generally vertical section between guide rollers 80 and 84 and one in horizontal Direction spaced downward vertical portion between rollers 86 and 88 includes. It is also noted that due to the arrangement of the guide rollers, the web material of each individual or from both supply rolls 24 and 26 directly over the guide rolls 90 and 92 and then down over the folding bars 66 can be directed. This movement path can be used in tote bag manufacturing operations that do not require a cover or wrapper layer.

The construction of the components in the cover horn 82 is best seen in Figures 4-6 of the drawings. As shown there is, the cover folding horn is carried by a transverse plate-like support or guide 94, the or the is attached to the front of the supports 14 and 16. On the guide 94 are two pairs of sliders 96 and 98 two overlapping or telescopic plate-like carriages 100 and 102 supported. The front edges of the plate-shaped Carriages 100 and 102 are aligned one above the other and are in appropriately rounded or otherwise shaped so that no noticeable braking force is exerted on the web material running over it is exercised when this passes through the path of movement between the guide rollers 80 and 84, as is most clearly shown in Fig. the drawings. Both lobe-shaped carriage 100 and

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102 are provided with a welded-on plate 104, each of which has a threaded opening for receiving hand spindles 106 in of the type of traveling nuts which are secured against axial displacement with respect to the supports 14 and 16. One Adjustment or rotation of the hand spindles 106 brings about a transverse adjustment of one or both plate-shaped carriages 100 and 102.

Near the lateral end of each plate-shaped carriage 100 and 102 is a slot 108 for the folding of the Cover provided. The folding slots 108 open into the rounded front edge of the corresponding plate-shaped carriages 100 and 102 and extend inwardly into the plate at an acute angle with respect to the rounded front edge, to be able to capture the path. Furthermore, on the plate-shaped carriages 100 and 102 are shifted inwardly next to the slots 108 Folding mandrels or shoes 110 attached which slope upwards at an angle approximately equal to the inclination of the web moving section which runs between the cover switching mandrel and the guide roller 84. Two retractable pressure rollers 112 and 114 are also on the plate-shaped carriage above of the slots are arranged to hold the web material against the folding mandrels or shoes 110 with a slight pressure. As a result of this Construction can be seen particularly with reference to Fig. 4 and the drawings that the envelope or cover strips coming from the supply rolls 40 and 42 after it was placed on the edge of the double-ply sheet material coming from rolls 24 and 26, only in slots 108 needs to be threaded so that each cover or envelope layer is continuously and seamlessly folded around the corresponding edge of the web will. By appropriately adjusting the adjusting screws 52 to adjust the position of the rollers 40 and 42 and by adjusting

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Stelllang the hand spindles 106 for positioning the plate-shaped With slides 100 and 102, the operation of folding the cover or envelope with respect to the web is independent adjust from their width or lateral position between the supports 14 and 16.

As shown in Figures 1, 3 to 5, 7 and 8 of the drawings, are two pairs of elongated weld bumps 116 and 118 for use near the opposite edges of the Web W is provided in its moving section which extends between the guide rollers 86 and 88. The weld body pairs 116 and 118 are similarly constructed and arranged or attached in a manner similar to that is, according to which the above-described plate-shaped carriages 100 and 102 are arranged. In detail, each welding body pair is 116 and 118 held by a C-shaped bracket 120 which is attached to a carriage 122, which in turn on a transverse plate-like guide or carrier 124 is slidably mounted, which extends transversely between the supports 14 and 16 extends and is attached to the rear sides. The carriages are connected to axially fixed hand spindles 126, namely in of the type of race nuts as best shown in Figures 4 and 5 of the drawings.

The construction of the weld body pairs 116 and 118 is most evident shown in Figure 5 of the drawing. Accordingly, two identically designed plate arrangements 128 are provided in each pair, which is connected to two vertically arranged, rotatable shafts 130 and can be rotated with these. The shafts 130 are for simultaneous rotation in opposite directions through two in Engaging pinions 132 coupled, at least one of which is rotated or reciprocated by a hydraulic cylinder 134 can be. As a result of this construction, it is possible that the plate assemblies 128 in each weld body pair 116 and 118 between a working position, which is shown in Fig. 5 in full lines

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and in which the panel assemblies 128 form the edge portion of the web W overlap in a substantially parallel arrangement, and can be moved to an inoperative position is shown in phantom in Fig. 5 and in which both plate assemblies 128 are simultaneously outwardly away from the web are pivoted.

The facing sides of the plate assemblies 128 are provided with an elongated vertical groove 136 in which a Chromium-nickel heating wire 138 is positioned such that it does not interfere with any Surface of the plate assemblies is in contact. Vertical cooling channels 140 are in the arrangements 128 on the opposite Sides of the wire 138 are provided, and through these channels 140 a suitable cooling medium, for example water via appropriate flexible lines 142 (see. Fig. 7!) are circulated.

In connection with the welding body pairs 116 and 118, it should be noted that that the length of the plate assemblies 128 and, correspondingly, the heating wires 138 is usually about 457 mm in practice (18 inches). It is also noted that the welding body pairs in their working position only a little or do not put any pressure on the web at all. The result of this construction is that heating is extremely uniform a relatively low temperature is achieved over the length of the chromium-nickel wires 138 and consequently also a uniform one Fusion of all layers of thermoplastic material between the two chromium-nickel wires of each pair runs through. As a result of the length of the web material, the heating through which the chromium-nickel wires is subjected and the correspondingly low required melting temperatures becomes the control Relieved quite considerably over the melting temperatures, to the extent that complicated thermostatic control circuits are to be found no longer needed. In other words, the temperature of the chrome

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nickel wires only needs to be adjusted so that the combined thickness of the layers to be fused and the linear speed of the web are taken into account, which passes between the guide rollers 86 and 88.

It is important, however, that any suspension of orbit movement instantly causes the weld body pairs 116 and 118 to move to an inoperative position. this will achieved according to the invention by a controller which is shown schematically in Figure 1 of the drawings. In detail, on Introducing a conventional carrier bag manufacturing machine 54, the drive for the drive roller 58 is automatically switched off after the intermittent advance of the web W down the path in the bagging machine has stopped when the length of the material in the equalizing or compensating rollers 60 becomes so large that the arm 62 can pivot into its lowermost position, as in Fig. 3 e.g. is indicated by dashed lines. At this point, the arm 62 opens a switch 144, which circuit to the drive motor 56 for the drive roller 58 interrupts. A control unit 146 is provided for practicing the present invention, and so is connected in series with the switch 144 so that when the switch is opened to block the rotation of the drive roller 58 at the same time a signal is sent via conventional devices to the hydraulic piston 134 of each welding body pair 116 and 118 so that the plate assemblies 128 and heater wires 138 are moved to their inoperative positions. When the operation Similarly, closing switch 144 will reverse this operation. It will also notes that the control unit 146 is drivingly connected to each one of the valves 38 which comprise the hydraulic cylinders Press 36 to position or align the Controlling rollers 26. This circuit is designed in such a way that the switch 144, when it is opened when the end of the path is reached is operated, the valves 38 so that the carriages 34 remain in a neutral position. Otherwise the

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Edge sensors (not shown) actuate the hydraulic pistons which unnecessarily move the carriages 34 to an extreme edge position became.

To make the various carrier bag designs understandable, which can be treated by the apparatus according to the present invention, reference is made to Figures 9 through 12 of the drawings. For example, as shown in Fig. 9, the tote bag top 150 is provided with edge flaps 152 that are only therethrough are configured to turn over a single web of material which can be fed by one of the rollers 24 or 26. In the manufacture of this carrier bag, the rollers 40 and 42 are omitted and only the opposite edges of the web threaded into the folding slots 108 or inserted. The folded or folded edges of the sheet material are along a weld line 154 welded, which is determined by the position of the heating wires 138.

Referring to Fig. 10, a tote bag 156 is shown having a separate cover strip 158 over the opposite edges of the original web is folded in such a way as is evident from the above description of the device selected as an exemplary embodiment emerges. Punched handle openings 160 are of course in the carrier bag manufacturing machine 54 during the intermittent advance of the web material is usually worked out. In FIG. 11 is a carrier bag construction 162 which is similar to that of Fig. 10 except that the sheet material is offset to make this carrier bag is folded from its longitudinal centerline so that the edge flaps or covers 164 and 166 of the front and back walls of the carrier bag are offset accordingly. In this carrying bag version, a closure is achieved in that the covered Fold the strip or covered flap 166 over the remote cover 164 of the other flap.

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In Fig. 12, a carrier bag construction 168 is shown in which a cover is folded over on one side of the carrier bag and welded in this position, whereas on the other wall or On the front wall of the carrier bag, an unfolded strip 172 is provided, which is used to attach a single handle 174 serves. In the finally completed tote bag, the unfolded flap 172 is intended to be inserted into the folded cover 170 to be plugged into the other wall of the carrier bag so that the handle protrudes through a slot 176 in this. Although the attachment of the handle 174 as well as others do not continuous processes by common devices in the carrier bag manufacturing machine 54 are carried out, the fusing of the cover or envelope strips with the carrier bag material very simply carried out according to the present invention. In particular, the envelope or cover strip 170, which is used for Forming the folded edge of the carrier bag is used, inserted through the folding slot 108, whereas the cover strip 172 on the other side of the bag only on the opposite side Edge of the web is placed without a fold.

It can thus be seen that the present invention provides a high-performance edge-covering and folding apparatus for Carrying bag manufacturing machines are provided by which the above-mentioned objects are fully achieved.

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Claims (9)

Claims Apparatus for folding a sheet material and forming edge covers with a Carrying bag manufacturing machine can be combined, in which a longitudinally folded web consists of a heat-sealable sheet material is continuously advanced to a leveling roller assembly and then intermittently for the execution of the work steps for the production of the carrier bags is moved on in the corresponding rest periods, with a frame that provides support for at least a supply roll of the heat sealable sheet material and a folding device for continuous longitudinal folding of the web material, characterized by a number of parallel guide rollers (80, 8A-, 86, 88, 90), which are stored in the frame (10) and arranged in front of the folding device (66) so that between the Supply roll (24) and the folding device (66) a loop-like path for the unfolded web material is formed, the loop-like path having first and second moving portions of the sheet material an edge covering device (82) disposed on the frame (10) along the first portion of travel of the web material at least one additional layer of heat sealable sheet material (40) continuously to apply at least one lateral edge of the web material by along the second movement section of the web material on the frame (10) pivotally mounted heat sealing devices (116, 118) which the 509845/0321 additional layer of the sheet material with the web material during the continuous movement of the Merge the web material and the additional layer in the second movement section of the loop-like path, by automatic drive devices (13 ^, 146) for the heat sealing devices (116, 118), to pivot them away from the web material when the movement of the web material along the loop-like Path is interrupted, and by a guide device (68), which is connected downstream of the folding device (66) and directing the folded edge-capped web (W) to the tote bag making machine (54). 2. Device according to claim 1, characterized in that the frame (10) has a bracket (12) and two vertical ones Has supports (14, 16), the distance between the supports in the transverse direction being greater than the width of the heat-sealable sheet material prior to its longitudinal folding that the guide rollers (80, 84, 86, 88, 90) in these supports are mounted so that they the web material from the supply roll (24) away up and then after down to the longitudinal folder (66), wherein the first and second moving portions of the web material along the loop-like path in substantially vertical positions on opposite sides of the supports (14, 16) are positioned, and that the edge covering device (82) has a cover folding mandrel which is attached to is attached to the supports (14, 16) between two guide rollers (80, 84) which form the first moving portion of the web material limit. 509845/0321 3. Device according to claims 1 or 2, characterized in that that the edge covering device contains a support arm (44), the one masking tape supply roll (40) in Working position opposite the cover mandrel (82) and the edge of the web material. 4. Device according to one or more of the preceding claims, characterized in that the edge covering device (82) has two plate-like Has carriage (100, 102) which are mounted between the supports (14, 16) and mutually telescopic and with respect to the supports are independently adjustable in the transverse direction that the plate-like Carriages together form a guide edge for the web material when it is between the two guide rollers (80, 84), which limit the first movement section of the loop-shaped path, and that the plate-like Carriages each have a folding slot (108) which extend away from the common guide edge extend backwards and inwards at an acute angle to this. 5. Device according to one or more of the preceding claims, characterized in that the second portion of movement of the web material is linear and that the heat sealing devices (116, 118) have at least one pair of elongated parallel ones Having heating wires (136, 138) on opposite sides of the sheet material in the vicinity of a Edge of the web material are pivotally supported. 509845/0321 6. Apparatus according to claim 5,
characterized, that the heat sealing devices (116, 118) have plate assemblies which face one another included, along which the heating wires (136, 138) are held that the plate assemblies between a Working position in which the mutually facing surfaces are essentially parallel on opposite sides of the web material and an inoperative position can be pivoted in which the surfaces are scissors-like in one Distance from the web material. 7. Apparatus according to claim 5 or 6, characterized in that that the plate assemblies (116, 118) have channels (40) on opposite sides of the heating wires (136, 138), in which a cooling medium circulates. 8. Device according to one of claims 5 to 7 »characterized in that that the heat sealers have two pairs of plate assemblies and independently adjustable carriages (122) each having a pair of the plate assemblies wear, whereby the heat sealing devices to the respective width and position of a web material between the Supports are adjustable. 9. Device according to one of the claims 5 to 8, characterized in that that drive devices (134) for the plate assembly ^ are provided with the heating wires, which pivot them between their working positions and ineffective positions, and in that the automatic drive devices contain switching means (146) responsive to the termination of the Address the path movement and switch the drive devices (134). 509845/0321