DE2115161A1 - Device for the production of handles on thermoplastic carrier bags - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Weickmann,

D1PL.-ING. H. Weickmann, D1PL.-PHYS. Dr. Dipl.-Ing. R A. "Weιckmann, Dipl.-Chem. B. Huber

8 MUNICH 86, POST BOX 860 820

MÖHLSTRASSE 22, NUMBER 48 39 21/22

<983921/22>

PMC Corporation, San Jose, California / USA 1105 Coleman Avenue

Device for making handles on thermoplastic pouches.

In the case of the bag-making machines currently available for making a handle on carrier bags of the type described here, a device for forming a web is provided in order to form a multi-layered edge on each main wall of the bag. The rim can be of any desired width determined by the strength required and the size of the cutout for engaging the hand. In order to increase the strength of the edge of a bag, welds of any desired shape are carried out, by means of which the edges are attached to the bag wall underneath. Usually a sequence of operations is provided in which the cutouts are first made and then the welds are made in the edge . If certain devices for the production of the

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cuts and then provided for the production of the welding pattern in the edges, the threading of the film is through the machine becomes more difficult and more space is required on the fastening rails of the bag-making machine. Farther must, if separate devices for the production of the cutouts and for the execution of the welds in the Edge are provided, separate drives for each of these Devices are provided from the main drive of the bag making machine. This makes the construction mechanical more complicated and accordingly increases the risk considerably that errors occur in the time coordination and the drive.

The device for making the handles in a bag is also constructed so that the welding rods go back and forth to make the welds in the edges of the bag. Since the welding rods by electrical Resistance heaters are usually heated by flexible conductors such as braided conductors Wires connected to the electrical circuit so that the welding rods can be moved back and forth and that An electrical connection to the heating circuit was nevertheless maintained. It often happens that the flexible electrical conductor due to the permanent / moisture-proofing the back and forth movement of the welding rods show signs of fatigue. The ladder breaks under these "circumstances.

According to the present invention, the welding rods for making the welds are in the edge of the handle of a bag so that no flexible electrical conductors need to be provided, whereby the

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Eliminates the possibility of this ladder "breaking" like it was explained above.

According to the present invention, the apparatus for making the handles attached to a bag in such a way that that it can be adjusted from the path of movement of the roller conveyor in an inoperative position when the Production of the bag making machine for a longer period Period is interrupted as a mass internal cycle. if Such an arrangement would not be provided, the Polie would by the heated welding rods due to the extended periods of time that the film would be exposed to the heated sealing bars will be damaged Such an arrangement can be achieved, are that the maintenance, such as cleaning the welding rods, and the renewal of the welding rods is facilitated "

Usually, a cover made of a Teflon glass cloth is provided for the welding rod in order to allow for gluing and the To prevent the formation of web material on the welding rods If Teflon cloth is provided, they are suitable Devices required to attach the cloth to the welding rods to keep. Contrary to this common practice, the invention provides a coating for the sealing bars provided, which has suitable detachment or release properties, through which a sticking and the Formation of tap material on the welding rods is prevented. Because of the fact that the use of Teflong glass cloth is avoided, it is possible to operate the welding rods at a lower temperature, since in use of the Teflong glass cloth B shows a temperature drop of approximately 75 ° occurs.

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Another feature of the present invention is that a single drive is provided for the printing plates, the welds and the cutouts in the edge of the Make the bag. As already stated above, the usual devices for the production of handles on a bag so constructed that separate devices for forming the cutouts and for producing the welded pattern are provided in the lips or the edge of the bag. "Separate drives are also provided, around the cut-out forms and the structure for the welding rod in the working rhythm with the intermittent Actuate movement of the web. Each of the separate devices i.e. «the cut-out forms and the components for the welding rod, carry out their work process at the same time on each of the opposing lip parts of the bag o For a more detailed explanation it should be mentioned that the cutouts in the lip parts, which are to the main wall of the bag belong, are formed by simultaneously actuated pressure plates that are moved back and forth against each other. The printing plates carry upper molds that interact with a fixed lower mold that are between and in the same Distance from the upper molds is arranged. The drive for each pressure plate includes a cam, a cam follower, a spring and a cam follower yoke and a bumper »

According to the present invention, the reciprocating Movement of the type described above for each pressure plate achieved in that a single cam, a cam follower, a spring and a cam follower yoke and its push rod are provided, will. The reciprocal reciprocating movement of the upper and lower pressure plates is articulated by one reciprocating carrier transferred, its

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Details should be explained below.

In the following, the invention will more detail with reference shown in the drawings preferred embodiments described _e In the drawing:

Fig. 1 is a schematic central longitudinal section through a Bag manufacturing machine that incorporates the inventive device for manufacturing a handle for contains a pouch,

Pig * 2 made a transverse cut through a folded, thermoplastic sheet that has a single folded lip or hand,

Pig. 3 is a view similar to Pig. 2, in which a double-folded lip is shown, in the three Web layers are provided,

Pig. 4 is a perspective view of a finished one with handles equipped bag in which the cutout intended for the hand is partially cut off,

Pig. 4A shows an embodiment in which the hand-receiving Cutout can be made so that the partially cut web lip hangs on the bag,

Pig. Figure 5 is a perspective view of a finished handle on a bag, the one intended for the hand Cutout has been completely removed,

Pig. 5A shows another embodiment in which the partially incised web lip remain on the bag

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can,

Pig. 6 is an enlarged cross-section taken substantially along the line 6-6 in / day. 1, with parts broken away are,

Fig. 7 shows a section from dey ^ Fig. 6 in which another Position of certain parts of the disk drive is shown,

FIG. 8 shows a section through FIG. 6 along the line 8-8,

FIG. 9 is a partial view of FIG. 8, in which a piston rod shown in the actuated state to interrupt the operation of the plates,

Fig. 10 is an enlarged partial plan view of the mechanism for making the bag handles along the line 10-10 in Fig. 1,

11 shows a section along the line 11-11 in FIG. 10,

FIG. 12 shows a horizontal section along the line 12-12 in FIG. 11,

13 is an enlarged partial view of FIG. 6, with parts broken away;

Fig. H is an enlarged Teilansiclit the Verschweißstangen and the pressure plates, viewed from the perspective of line 14-14- in Fig. 11, the mutual arrangement of the parts illustrated _f before the printing plates werö.en out against each other and _s

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* ■ ι ""

Pig. 15 is a view similar to FIG. 14, in which the
Operating position; is shown in which the linear welds and the cutout are made.

In Pig * 1 there is shown a bag making machine which
is generally designated by the reference numeral 20 and at the
operationally connected therewith the device according to the invention for producing the bag handles is attached.
Briefly, the bag making machine includes a base plate 22 which supports a plurality of upstanding, transversely oriented side panels 24a, 24b and 24c which provide support for the lifting mechanism of the bag making machine to manipulate the web. On the side plates 24a and
Fastening rails 25 are attached to 24b. At one end of the bag making machine a supply roll WR is mounted on a shaft 26, which in turn is rotatable in cantilevered
Brackets 28 is held (of which only one bracket is shown in Fig. 1). The supply roll or web roll
WR contains what is known in the industry as a
denotes an even-edged J-stick, by which it is understood that the web roll contains an iolie that runs along
its longitudinal centerline is folded. Of course, it is for one skilled in the art of bag making machines
It is readily apparent that an unfolded or rolled stick can also be used in conjunction with a triangular folding board, by means of which an even-edged or lip-shaped stick is continuously formed.

The web withdrawn from the web roll WR is fed to a lip folding device 30, the groups of paltrolls 32a, 32b, 32c and 32d and various web folding devices.

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which are not shown as they do not form part of the present Forming the Invention «The web is first between folding rollers 32a and then between rollers 32b, 32c and 32d in this order. The folding device can be arranged so that the web ends WE are folded, to create a single fold and thereby provide two web layers in the bag lip or edge, (which is sometimes referred to as a tape) as shown in Fig. 2, or it can be arranged so that a double folding is carried out so that three web layers are formed in the bag lip as shown in FIG istο After the web ends have been folded, will the web 2 is fed to draw rollers 32 and then zigzagged through a web gathering and tension control device 36 guided. The web then runs from left to right, as seen in FIG. 1, and it is here of the one according to the invention Mechanism 38 processed to produce a bag handle. The mechanism 38 is carried by the rails 25. The web then runs between two draw rollers 40 and is passed between a reciprocating seal bar assembly 42, one below which intermittently rotating counter pressure or welding roller 44 is attached. The drive for the bag making machine is designed in such a way that that it moves the web intermittently by a distance equal to the width of a bag and which is generally referred to by the term train length.

During the period that the web is at rest, the sealing bar 42 is moved downward and against the counter pressure or sealing roller 44 is pressed, which is not rotating at this moment. Once the welding rod 42 under pressure to rest against the welding roller 44

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comes, the folded web is welded and separated in the transverse direction. The bag is made by conveyor belts 48 fed to a stacking table 46. The stacking table 46 is arranged slightly inclined, and he is in this. position held by struts 50.

The bag handle making mechanism 38 is timed to the drive of the bag making machine operated by a belt 52 which is attached to a pulley 54 on a shaft of the drive of the The bag making machine is attached and drawn around a pulley 56 attached to a shaft 58 which is rotatably supported in the frame of the bag making machine. As will be explained below, leads the device 38 for manufacturing a bag handle its operation on each folded lip of the web during the period that the sealing bar the web is welded and severed in the transverse direction.

In Pig »6 is an enlarged side view, partly ia Section of the device 38 for producing a bag handle shown. As explained in detail below should be, assigns the one in Pig. 6 shown device 38 for producing a bag handle a single Drive on, through which both pressure plates are moved back and forth against the lips of the film at the same time, and it Means are provided for removing the portion of the film which forms the cut-out portion. Farther the device is designed so that the Versehweißstangenanordnung can be pivoted by at least 90 °, so that it can always be removed from the path of movement of the film web when the bag-making machine is shut down.

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tet or paused for any period of time is longer than a bag making cycle «,

As can be seen from Fig. 6, a depending plate 60 is attached to the rail 25 lying on the left side, in which one end of the shaft 58 is rotatably supported and on the other or the rail 25 lying on the right side is also attached a depending side plate 62 in which a bearing 64 is provided, in which the shaft 58 is rotatably arranged. The mechanism 38 for making the bag handle \ <d.rd supported by parallel, transverse guides 65 and 66 , between which on rollers 68 a box-shaped housing 70 is slidably arranged in which in suitable Wels® slidable plungers 72 and 74 are held, which contribute to the fact that an upper plate 76 and a lower plate 78 each perform a reciprocating movement on the housing 70 two generally triangular plates 80 and 82 are attached to support two of the rollers 68. A plunger mechanism 84 is provided to drive the mechanism 38 to produce the s bag handle in a direction transverse to the direction of movement of the film so that the mechanism for making a bag handle can be properly adjusted with respect to the folded lips of the web.

The locking mechanism 84 comprises an elongated rod 86 at one end of which a corrugated button 88 is pinned is. The rod 86 extends with free play through a hole formed in a transverse rod 90, the Ends firmly attached to triangular plates 80 and 82. The lower end of rod 86 is in a transverse direction Terminal block 92 screwed in, and the terminal block

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extends like from Pig. It can be seen 8, on the lateral guide rails 66 and 64 also _β At each end of clamping bar 92 are attached small pin 94 to prevent rotation of the clamping strip 92 when the rod 86 is rotated to pull either the terminal block 92 or to loosen.

In accordance with a feature of the present invention, the plates 76 and 78 can be operated simultaneously using a single Cams reciprocate toward and away from each other, the squat reciprocating plunger 72 and this movement is transmitted to the plunger 74. Aue the Fig. 6, 7 and 8 it can be seen that a cam is mounted on the shaft 58 by means of a clamping block B 96 which is attached to the Shaft 58 is keyed. The outer surface of the cam is in contact with a roller 98, which by means of a Pin 100 is rotatably attached to a forked portion 102 at the lower end of the plunger 72. The inside of the Housing 70 lying parts of the plunger 72 and 74 carry pairs of rollers 104 and 106, the plunger 72 and the respectively Plunger 74 are assigned. As can be seen from Fig. 8, on the rod 72 are diametrically opposed flats 108 is formed, and an axis 110 is provided which extends through this part of the plunger 72 in which the flats 108 are formed, extends therethrough. Rollers 104 are rotatably mounted on the shaft 110, and on an extended part of the axis is rotatable in a T-shape Nylon block 112 fastened in a slot 114 (see Pig. 13) is arranged displaceably. Similarly, an axle 110a on the plunger 74 carries the rollers 106. At the end of the A nylon T-block 112a is attached to axis 110a and arranged so that it is slidable in a similar slot 114. From Fig. 13, the nylon blocks 112 and 112a are in the

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Slots 114 can be seen,

The cam roller 98 is pressed against the Cams 94 printed, one end of the compression spring rests against the lower end of the plunger 74 and the other end the compression spring lies in a bore 118 of an arrangement which is indicated generally by the reference numeral 120. The order 120 is attached to the lower surface of the housing 70 and, as can be seen from Figure 8, it has several webs 122 equipped. The housing has a depending portion which is provided at 123 with a bore, which for Receiving the outer race of a bearing 124 is used. As can be seen from Fig. 6, the inner race of the bearing is attached to a hub 126 of the cam 94

Further referring to Figo 6 it can be seen that on a shaft 130, which extends through a web 132 of the housing 70, movement-transmitting lever 128 pivotable are appropriate. The levers 128 are held on the shaft 130 by sleeves 134. The only cam drive by which the two plates 76 and 78 are actuated, works in the following way: when the shaft 58 passes When the belt 52 is rotated, which is drawn around the pulley 56, the cam 94 is rotated. When the roll 98 is on that part of the squat surface meets the center of rotation is closest, the plunger 72 is moved downwards, while at the same time the plunger 74 due to the force exerted by the Spring 116 is applied upwardly, thereby engaging the panels with the folded lips of the web will. When the cam roller meets the elevation of the cam 94, the slide 72 is shifted upwards, and the plunger 74 is moved downward by the levers 128 against the bias exerted by the spring 116

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moved, whereby the plates 76 and 78 release the folded lips of the web.

The plunger 72 is connected to the plate 76 in that its upper end is slidable in a bore 127 which is formed in the plate 76 * The bore 127 is slotted longitudinally at 129, and the bore diameter is reduced by the fact that clamping pins 131 are provided, which, when tightened, narrow the bore 127 so that the plunger 72 is firmly clamped. To adjust the pressure, with which the plate 76 presses on the upper lip UL of the track is a bolt 136 with play through a hole in a rectangular plate 138 (see Fig. 10) passed through and screwed into a threaded hole in the upper end of the plunger 72. The bolt 136 is provided with a threaded washer 137 which is used to prevent a axial movement of the bolt I36 when it is rotated. If the clamping bolts I3I are loosened, an enlargement can be achieved of the pressure of the plate 76 can be adjusted by rotating the bolt I36 to raise the plunger 72 · The The setting of the desired pressure is recorded by that the clamping bolts 131 are tightened.

In a generally similar manner, the lower plate 78 is provided with pressure adjustment means. The plunger 74 protrudes like as shown in FIG. 11, into a bore 148 formed in a depending portion 150 of the lower plate 78 is. The depending part 150 has a longitudinal slot 152 which, together with bolt 154, forms a clamp which holds the upper end of the plunger 74 firmly in the bore I48. Just below the hanging part 150 is a small rectangular one Plate 156 attached, which is provided with a bore to receive plunger 74, and which is also

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is slit so that it forms a clamp. To the rectangular Clamping plate 156 to plunger 74 is one Bolt 158 is provided. A screw 160 is passed through the plate 156 and screwed into a bore 162 which is inserted into the depending part 150 is provided. The screw also has a locking nut 164 through which when tightened, the screw is prevented from rotating. To adjust the pressure of the lower plate 78, are the clamping bolts 154 are released so that the plunger can be moved in the bore 148. This creates a greater pressure obtained by turning the screw 160 so that the plate 78 is raised. Then the clamping bolts 154 are again tightened firmly so that the end of the plunger 74 is clamped in its adjusted position.

According to an essential feature of the present invention the welding rods for forming the aligned welds in the folded lips of the web are arranged in such a way that that they are shifted laterally from the path of movement of the film each time the machine is operated for is interrupted for more than one bag making cycle. Furthermore, the arrangement of the welding rod remains during fixed during normal operation, which simplifies the wire feeds for the heating elements of the welding rod and become more reliable. From Mg, 6 it can first be seen that on the surface of the housing 70 a generally inverted L-shaped member 166 is attached, and this member has an enlarged sprue 168 in which a bore it is provided that the daöibar has a short stub shaft 170 (Fig. 10) receives. As best seen in Fig. 10, a cantilever arm 172 is clamped to the shaft 170, and A ring gear 174 is mounted on the upper part of the shaft.

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wedges, bo that it lies over the cantilever arm 172, as shown in Pig. 6 is shown. The - "- uelegerarm 172 has a vertical extending web part 176, on which erungen with the help of spacers 178 a unitary mechanism of welding rod and cutting die, indicated generally by reference numeral 180, is attached. The elongated ones Spacers 178 are attached to the vertical web 176 by means of screws 182 which extend through the Spacers 178 extend therethrough and into one of the welding rods the welding rod arrangement 180 are screwed in

In order to rotate the welding rod arrangement 180 out of the path of movement of the film web, a plate 186 is also attached A hydraulically or pneumatically driven cylinder 184 is attached using a small angle arm 188. Am above Rod portion of the cylinder 184 is suitably attached to a rack 190 which meshes with the ring gear 174. When the bag making machine has been operated for longer than one manufacturing cycle of the bag making machine is interrupted or when the push button is pressed to stop the bag making machine, the head end becomes of the cylinder 184 is brought into communication with a pressurized fluid, causing the rack 190 to the left in Fig. 12 is moved so that it assumes the position shown in dashed lines. This makes it natural the shaft 170 rotated because the ring gear is firmly attached to the shaft, whereby the cantilever arm 172 the assumes the position shown in dashed lines, wherein it the welding rod and the cutting mechanism 180 with 3ich leads, since these are firmly connected to it by the screws 182.

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Reference is made to Pig »11 for a description of the arrangement of the welding rods and the cutting mechanism and 12. First of all, it can be seen from FIG. 12 that two elongated Welding rods 192 and 194 are provided and that they are supported by two blocks 196 which are attached thereto by screws are attached, held laterally at a distance from each other will. Conventional tubular electrical heaters 192a and 194a are located in the sealing rod 192 and 194a, respectively. 194 is attached to heat the sealing bars to the temperature necessary to secure the part of the web to be welded, which is brought into contact with the welding rods. By having space between the welding rods the cutting form 198 is arranged between the Versehweißstangen by several screws 200 in a fixed Position is held, which extend with play through holes in the welding rods 192 and 194- and in G-threaded bores are screwed into the cut-out form 198. FIG. 11 shows the cut-out forms 198 in cross section, with it can be seen that upper and lower cutting dies 198 are provided. The inner walls of the molds are preferred beveled so that cutting edges 202 are formed.Issoll it should be noted that one of the cutting edges 202 is facing upward and the other is facing downward to interfere with each other opposite longitudinal parts of the web W simultaneously to produce aligned cutouts, since the Web is severed as shown in Figure 6 as it passes through the mechanism for making a bag handle to be led.

To prevent the folded web tapes or lips from sticking to the cut-out forms 198 or the welding rods 192 and 194, and to separate the folded lips of the web from each other, are between the upper and

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the lower plate 76 and 78 resiliently an upper and a lower Stripper plate 204! Or. 206 attached the stripping plates have bent end portions 207 to prevent them from tearing in any way the moving cream or represent any obstruction to them · Referring to Figure 10, it can be seen that support bars 208 for the stripper plates are attached to plate 186 in a generally rectangular shape. The handrails 208 are in their Eorm and in their function the same, which is why it is sufficient to describe only one of these handrails 208 are arranged so that they do not include the sealing bar mechanism and the cutting mechanism 180 hinder when they are brought out of service as shown in 71g «12.

The support rods 208 are shown on an enlarged scale in FIGS 14 and 15 shown. Pig. 14 shows that the support rod 208 has a cantilevered portion of reduced thickness 210 in which a plurality of through holes are formed, by the external bolts 212a and internal bolts 212b are performed. A compression spring 214 is on each bolt placed on, and the ends of the outer bolts 212a are either by welding or by screwing to the lower stripping plate 206 attached, while the inner Bolts 212b are attached to the upper stripper plate 204.

In the stripper plates 204 and 206, as best seen in FIGS. 12 and 14, there are elongated slots 216 formed so that the rounded nose portion 218 of the welding rods protrude through the stripper plates and can abut firmly against the surface of the plates 76 and 78 to thereby create the linear welds in the

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folded lips to form the web. In each of the trays 204 and 206, a through opening 220 is also provided so that the cutting form 198 through the stripping plates 204 and 206 can be guided to remove a piece of material from the folded lips of the web, whereby the cutouts H are formed for the hand to engage »

Those trained in accordance with the invention apparatus described for the preparation of bag handles is provided in connection with a bag making machine which comprises a switch circuit, the & en Bag manufacturing process of a bag-making cycle after the production of a predetermined number 'of bags is interrupted, so that the operator a stack of Beatein of the stacking table · A bag making machine constructed in this manner is disclosed in US patent application Ser. No. 787,767 dated December 3, 1968 and in U.S. patent application Ser. ITo. 821 754 of May 5, 1969. These applications, to which Mermit is referenced, show that operation is suspended for a full cycle when the bag counting mechanism has reached the end of a count. During this time, the sealing rod 42 and pull rollers 40 are put out of operation. A similar arrangement must therefore be provided for the mechanism 38 for making the bag handles to thereby prevent the plates 76 and 14 from moving back and forth during a bag making cycle To prevent the plates 76 and 78 from running around. These facilities are shown in Figures 8 and 9

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On the upper wall 221 of the lower panel assembly 78. Is a Pneumatic or hydraulic cylinder 222 is fastened by means of a nut 224 ″ which is screwed onto a stud bolt 226 which is formed in one piece with the cylinder. The cylinder has the usual protruding piston rod 228 (Pig * 9), at the end of which a dowel pin 230 is inserted, which aligns with a through opening 232 formed in the rectangular plate 138. At the moment when the control circuit of the bag making machine gives the signal for an interrupt cycle, pressurized fluid is admitted into the head end of cylinder 222, whereby the piston rod 228 (Fig, 9) is extended so far that a large nut 234 against the lower surface the plate 138 comes into abutment, thereby forcing the plates 76 and 78 to close in their retracted position remain. In the pig. 9, the piston rod 228 is extended and the nut 234 is in contact with the plate 138.

When the piston rod of piston 222 is extended, cam roller 98 on the lower end of plunger 72 does not come with that part of the surface of the cam 94 which has the smaller radius. In this way, the Cylinder 222 that the plunger 72 moves back and forth.

At the end of the interruption cycle, the pressurized fluid is at the Turned off the head end of the piston 222 and ventilated this end, whereby the piston rod 228 withdraws so that the device for forming a bag handle can resume normal operation.

To describe the operation of the mechanism 38 for manufacturing a bag handle, as far as this relates to the

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Effect of plates 76 and 78 in making the aligned Welding and the cutouts in the web lips "refers, reference is made to Pig. 14 and 15. In Fig. 14 firstly the plates 76 and 78 are shown in their retracted position »The folded lips of the web W, the upper lip UL and the lower lip LL lies above and below the stripper plate 204 and 206, respectively. When the plates 76 and 78 are retracted, the stripper plates are due of the springs 214 on the inside and outside bolts 212a and 212b at a distance from the working surfaces of the welding rods 192 and 194 and at a distance from the Cutting shape 198. When the plates 76 and 78 against each other are moved, the web lips UL and LL are against the stripper plates 204 and 206 are pressed and upon further movement of the plates 76 and 78 towards one another, the springs become 214 compressed, whereby the stripper plates 204 and 206 are moved against each other «This movement is continued until the rounded nose portion 218 of the welding rods 192 and 194 press the upper and lower lips of the web against the silicon strips 240 to form pairs of line shapes To form welds LS, which can best be seen in FIGS. 4 and 5. While the linear When welds are made, the cutting die 198 cuts a portion of the path, commonly referred to as a section out of the folded web lips.

The mechanism 38 for forming a bag handle is equipped with means to discharge the portion removed from the web by the cutting die 198 «Aus 6, 14 and 15 it can be seen that in the upper and lower plates 76 and 78 passages are formed which are attached to lines that can be connected to a vacuum pump. It should first refer to

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the pig. 6, from which it can be seen that in the top plate 76 has a bore 241 formed therein into which a knee 243 is fitted. At one end of the knee is with A hose 245 is fastened with the aid of a clamp 247. The bore 241 stands with an elongated passage 249 (Fig. 11) in connection, which is approximately as long as the shape 198. In the lower plate 78 there is a hole at 251 (Pig «6 and 11) and a knee 253 is inserted into this bore. A hose 255 is connected to the knee 253. There is also an elongated passage in the lower plate 257 is provided, which is approximately as long as the shape .198 is.

Each of the tubes 245 and 255 is connected to a suitable vacuum pump (not shown). when the plates 76 and 78 against the welding rods 192 and 194 and the mold 198 through which the linear welds and the cutouts for the handle are made, are pressed, the removed web parts are over removed the passageways and hoses 245 and 255, carrying sections S1 and S2 to a suitable waste container (not shown) feed. Fig. 15 shows how the sections S1 and S2 in operation just become a waste container be transported away.

Reference is made to FIGS. 14 and 15 for a description of the operation of the plates 76 and 78. Before the plates 76 and 78 are moved against each other, they are in the position shown in FIG. The rail lips UI and II are located in contact with stripper plates 204 and 206. When the plates 76 and 78 are moved towards one another, the web lips are lifted with the force exerted by the springs 214 is applied, against the stripping plates 204 and 206

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The rams 76 and 78 move further towards one _{another 9} until the part 218 of the welding rods is pressed firmly into the web lip in order to produce a linear welding LS (FIGS. 4 and 5) and the cutout H. Sections S1 and S2 are removed from the lip at the same time and they are withdrawn via passages 249 and 257, via which they are fed to a waste collection device. After the web lips UL and LL have been released from the plates 76 and 78, which return to the position shown in FIG.

4A and 5A show different types of cutouts which hold the sections S on small strips T. To produce a section of the type shown in Figure 4A, the cutting edges 202 of the mold 198 are ground along the dashed line 260 so that the web lip is not cut along that line, and the cutting edge is ground so that the tabs T1 are produced will. The type of cutout shown in FIG. 5A is produced by grinding the cutting edges 202 so that the noses T2 are produced. The main advantage of maintaining the bag making section is that it facilitates the formation of an aligned stack on the stacking table 46. The fact that the section is left counteracts the tendency for protruding edges on the stacking table 46 to meet the edges of another bag. If such a case occurs, the bags are stored at an angle, which means that the operator has to align the bags again by hand _e

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In Pig. 4 likewise remain the sections. As shown in the Pail shown in Pig · 4A the curved ends 270 of the cutout and one of the straight lines 272 extending between the curved ends, incised, while no cut is made along a line 274 which is parallel to the line 272. the remaining sections are used to close the bag opening when the section of a bag wall through the Cutout of the other wall of the bag is performed. This creates also a more comfortable grip.

109844/1052

Claims (1)

Claims 1. A method for producing a thermoplastic bag with a handle, characterized that the ends of a web, which is folded along its longitudinal centerline, are folded to form a strip to form from at least two web layers, and that at the same time linear welds and cutouts for Engaging a hand in the opposing longitudinal parts of the> s strip can be formed. 2o device for performing the method according to claim 1 for the production of bags with handles from a thermoplastic web, which along their longitudinal center line is folded so that the edges of the web are even, indicated by a device (30) for splitting each edge of the web to produce a lip comprised of at least two web layers, and by means (38) for the simultaneous production of mutually aligned cutouts (H) and several linear welds (LS) in each lip. 3. Apparatus according to claim 2, characterized in that the device for producing the cutouts and the linear welds plates (76, 78) which can be reciprocated against each other, that a device (72) is provided through which one of the plates (76) is directly actuated for reciprocal movement, and means (128, 74, 116) is provided responsive to the reciprocating movement of these addresses a plate, back to the other plate (78) and to move here. 109844/1052 4 · Device according to claim 3 »characterized in that the device for moving the other plate (78) back and forth has a rocker arm (128) arranged so that it can be pivoted about its center, a first slide (72) arranged so as to be movable, which is connected to the one plate (76), a displaceably arranged second plunger (74) t which is connected to the other plate (78) / and contains devices (110, 110a; 104, 106) on these plungers which are connected to the Rocker arms can be engaged to swing those arms back and forth when the first slide for one plate is reciprocated so that a simultaneous, oppositely directed reciprocation of the second slide for the other plate is created. 5 · Device according to one of the preceding claims, characterized in that devices (204 »206) for lateral separation and holding of the long parts the tapes folded into a multilayer strip are provided; that fixed welding and cutting devices ("60) are provided, which are arranged between the separating and holding devices (204, 206); and that the plates (76, 78) are movable relative to one another and against the fixed welding and cutting devices in order to bringing the separated strips into contact with the welding and cutting devices to make linear reinforcement welds and make the cutouts for engaging a hand in each of the separate strips 6 · Device according to claim 5, characterized in that the separating devices generally rectangular plates (204, 206), which are limited in relation to each other 109844/1052 each other and away from each other that slots (220) are provided in these plates, which form free openings for the welding and cutting units (198, 218) so that they can protrude through these openings, and that springs (214) are provided are to the plates (204, 206) to keep away from each other, said partition plates are to be moved towards each other when the plates (76 - ₇₈₎ move against the weldability and Sehneideeinriehtungen (180) for the folded ends of the web firmly clamped during the cutting and welding process. 7 · Device for making bags with handles according to one of the preceding claims in connection with a bag-making machine which has devices to count the number of duty cycles of the bag making machine to make batches of bags counted, by this counting means, the operation of the bag making machine during a bag making cycle is interrupted at the end of the count, characterized in that devices (172, 174 » 184i 190) are provided on which the welding rods (192, 194) and the cutting form (198) are arranged so that they can be pivoted out of the path of the web, and that Means are provided that on an interruption of the operation of the bag-making machine, which is longer than A bag making cycle takes time to respond to the sealing bars and the cutting die out of the way of the web to pivot out. 8 · Device according to claim 7 »characterized in that devices (138, 234, 222) are provided are to allow a reciprocating movement of the platform 109844/1052 to prevent during an interruption cycle 9β device according to one of the preceding claims, da.by marked that devices (243, 245, 253 »255) are provided to the cut out Remove part of the track. 10. Apparatus according to claim 8 or 9, characterized in that the means for preventing reciprocating movement of the plates includes a fluid actuated cylinder (222). 11 «Device according to one of claims 8-10, characterized characterized in that a vacuum system is provided to discharge the cut-out portions of the web as soon as they are generated. 109 844/1052