DE2909479A1 - DEVICE FOR PRODUCING BAGS - Google Patents

Abstract

In the apparatus, a web of packaging material is shaped into a tube, a transverse seam is respectively attached to the latter as bottom closure, and its end part is severed as a bag. In order to treat the packaging material carefully, the apparatus possesses, for drawing the tube forwards on a shaping mandrel (22), intermittently rotating conveying means (30) acting by frictional connection and, for transferring a bag (2) severed from the tube into a conveying device (11) feeding the bags to other processing stations for filling and closing, a clamping gripper (55) which holds a bag (2) at the bottom along its transverse seam and which is moved up and down. <IMAGE>

Description

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VM 649
February 28, 1979 Gl / han

ROBERT BOSCH GMBH, 7OQO Stuttgart 1 Device for making bags State of the art

The invention is based on a device for producing bags according to the preamble of the main claim. In a device of this type, which has become known, for example, from DE-OS 22 4-1 226, the transverse seam welding device is designed so that they together with the end of the mandrel at the bottom of each hose a Forms a pair of edge folds which are gripped by a pair of clamping pliers for pulling the hose forward. The periodically Clamping pliers moved up and down pull the grasped end of the hose down into the area of a conveyor device, wherein a new tube part is formed around the mandrel, of which the end part is used as a bag the separator is cut off. Since making

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of the hose from a packing tape boim preferring considerable Forces required, the edge folds at the bottom of the hose end detected by the clamping pliers are heavily stressed, so that cracks appear in the packaging material, which impair the tightness of the bag.

Advantages of the invention

The inventive device for making bags with the characterizing features of the main claim has the advantage that only a bag separated from the hose is brought into the conveying area of the conveying device by means of the clamping tongs, the stress on the filler material being minimal. By separating the advantage of an already separated bag from the tube and the advantage of the tube itself, a bag can already be brought into the conveying device as long as the transverse seam welding device still attaches a transverse seam to the tube, whereby the output of the device is increased with the most gentle treatment of the packaging material .

The measures set out in the subclaims are advantageous developments and improvements of the bag manufacturing device specified in the main claim are possible. Particularly It is advantageous to convert the transverse seam that initially protrudes from the bottom of the bag to form the pliers in the Kind of that this one with its leading edge against the root

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the transverse seam of the bag and a strip that can be placed against the transverse seam about an axis running through its root the groin has butterflies surrounding it.

drawing

An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a front view of a bag manufacturing device, FIG. 2 shows the bag manufacturing device according to FIG. 1 in side view, partially in section, FIG. 3 shows a bag pulling device in side view and FIG. 4 shows the bag pulling device according to FIG. 3 in a side view in another working position.

Description of the embodiment

The bag making device 10 is in the present embodiment connected to a conveyor 11 for folding boxes 1, in each of which a bag 2 is inserted will. The conveyor 11 has an endless chain 12 rotating in a vertical plane, on which in the same Distances drivers 13 »14 are arranged in pairs. The drivers 13 »14- protrude into the between guide rails 15 and bottom rails 16 formed conveyor line for the folding boxes 1. The folding boxes 1 are in the form of Sleeves are fed in the region of a deflection section 17 of the conveyor chain 12, which is moved step-by-step, in its conveyor section;

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in the area of the bag manufacturing device is placed in each folding box 1 a bag 2 drawn in, which can be empty or partially filled; be on a subsequent station 19 the bags filled or completely filled and on subsequent stations first the bags 2 and then the Folding boxes-'closed in a known way.

The bag manufacturing device 10 has a vertical hollow mandrel 22 with a rectangular cross-section in a frame 21. By means of a forming shoulder 23 surrounding this in the upper part, a weldable packing material tape 3 is formed around the mandrel 22 to form a tube 4 and the edges of the packing material tape 3 placed one on top of the other are welded by means of a longitudinal seam welding jaw 24-. The packing material tape 3 runs off a supply roll 5 and is guided over deflection rollers 25-28 and a pendulum roller 29 to the forming shoulder 23.

For stepwise pulling of the hose 4- on the mandrel 22 its lower area is assigned an endless conveyor belt 30 on two opposite sides. The conveyor belts run over rollers 31, 32, which have a clutch-brake unit 33 are driven periodically so that they each 4 to the hose for making a bag 1 advance the corresponding length on the forming mandrel 22, with the packaging material tape 3 being pulled over the forming shoulder 23 will. For non-slip gripping of the hose 4- from

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the conveyor belts 30 have these openings 33 through the strand facing the forming mandrel 23 in each case a negative pressure acts on the hose. For this purpose, a suction box 34 is assigned to the respective strand, which via lines 35 is connected to a vacuum source.

Below the mandrel 23 is a combined cross seam welding and separating device 40, 41 arranged according to The end of the tube 4, which is pushed forward beyond the mandrel 23, separates as a bag 2 from a preferred tube and the new end is closed with a transverse seam 6. The transverse seam welder 40 (Figs. 3 and 4) has two mutually movable welding jaws 42, 43 which are attached to rods 44, 45. Leaving a gap one welding jaw 42 carries a clamping jaw 46 against which a second clamping jaw carried by a rod 47 48 is movable. In the gap between the welding jaws 42, 43 and the clamping jaws 46, 48 is a separating knife 50 of the separating device 41 can be displaced by means of a rod 49. The clamping jaws 46, 48 have suction bores 51 'on their side facing one another in a controlled manner Negative pressure is created. A little above the welding jaws 42, and below the conveyor belts 30 and the lower end of the Forming mandrel 23 is arranged on two opposite sides of the tube 4, a gusset folder 53 each.

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For introducing a bag 2 into the conveyor line of the
Conveying device 11 or in a folding box 1 provided by the conveying device 11, as an extension of the forming mandrel 23, clamping tongs 55 crossing the conveying path of the conveying device 11 can be moved up and down. The pliers 55 is for gripping and clamping the
Cross seam 6 of a bag 2 is formed. she has a
narrow bar 56 on a lever 57 and one against the
Bar 56 slidable plate 58 (Figs. 5 and 4). The lever 57 is in an eye 59 at the upper end of a rod 60
pivotally mounted and connected to a second lever 61 which is articulated on the piston rod 62 of a pneumatic working cylinder 63 fastened to the rod 60.
The plate 58 sits on a piston rod 64a of a second pneumatic working cylinder 64 fastened to the rod 60. A should 65 on an angle lever 66 protrudes resiliently through an opening in the plate 58 so that it | when the plate 58 is raised against the transverse seam 6, this tY is inclined against the strip 56. The angle lever 66 is mounted in an eye on the underside of plate 58 and $ || is under the tension of a tension spring 67. The bar 60 t- \

with the tongs 55 the conveyor * ■■ ·

device 11 between two pairs of rollers 68, 69 as a straight line '· ■■ Ii

guide slidable and via a bracket 70 with a.:

Rocker 71 connected, which lifts the rod 60 in cycles I

and lowers. \ j

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The bag making device works as follows:

After the hose 4 has been advanced on the mandrel 22 by a bag length, the welding jaws 4-2, 43 and the clamping jaws 46, 48 are moved towards one another, thereby flattening and pressing the hose. At the same time, the gusset folds 53 are displaced against the narrow sides of the tube, in which case they press gusset folds 7 into the flattening tube in the area of the sealing jaws. Immediately after the hose 4 is plagued by the welding and clamping jaws 42, 43 and 46, 48, it is cut through by advancing the knife 50. Immediately thereafter, the clamping jaw 48 is withdrawn, the two layers of the hose being pulled apart under the effect of the negative pressure in the suction bores 51, so that their edges are prevented from sticking together.

At the same time as the welding and Jaws 42, 43 and 46, 48 and upon completion of one Conveying step of the conveyor 11, the rod 60 is moved upward by the rocker 71, the Forceps 55 through a folding box 1 provided is moved under the bag 2 separated from the tube 4 but still held by the clamping jaws 46, 48. By simultaneously acting on the working cylinders 63 and 64, the front edge of the bar 56 is against the root the transverse seam 7 of the bag 2, the transverse seam 6

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inclined by the resilient roller 65 and finally, when the front edge of the strip 56 rests against the root of the transverse seam, the transverse seam 6 of the plate 5S is completely folded over into the horizontal and clamped against the strip 56. The resilient roller 65 is pivoted through the opening in the plate 58. A cam 73 seated laterally on the plate 58 supports the bottom of the bag 2. After the transverse seam 6 of the bag has been plagued, the rod 60 is moved back into its starting position, with the pliers 55 in the bag 2 grasped at its transverse seam 6 on the bottom the provided folding box 1 moves in. After reaching the lower position of the pliers 55, in which the bottom of the bag 2 is level with the bottom rails, the bar 56 and the plate 58 are disengaged from the transverse seam 6 of the bag 2 by applying compressed air to the two working cylinders 63, 64 in opposite directions brought. The bag 2 brought into the folding box 1 is carried away by a subsequent conveying step, whereby it is supported on the bottom rails until the bottom of the folding box is closed.

It should be noted that the bags produced are not necessarily placed in a folding box have to. Rather, they can be passed directly to the conveying device which they transfer to other processing stations until the packaging is completely finished.

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It should also be mentioned that the bag is hollow Forming mandrel 22 through from a measuring device 75 with each can be filled with a good quantity.

In the embodiment described, the lower end of the hose or the bottom of the hose to be finished The bag is advanced by the conveyor belts 30 to a little above the conveying space of the conveying device. In a modification of this, the assignment of the conveying device 11 to the bag manufacturing device can also be made in this way be that the hose end is partially advanced into the conveying space of the conveyor or into a folding box and there is taken over by the clamping pliers.

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Claims (2)

0 0 0 2909473 VM 649
February 28, 1979 Gl / han I ROBERT BOSCH GMBH. 7000 Stuttgart 1 f claims I 1. Device for the production of bags with a single I direction for forming a tube from a welding pool | ren packaging tape around a mandrel, with a cross seam II welding device for closing the front end of the I. Hose with the formation of a protruding transverse seam U a separator for cutting off a bag from ';] closed tube and with a pulling device ;! for the hose, the clamp pliers moved up and down j / ", characterized in that the Voraeheinrich- il device one that grips the transverse seam (6) of a bag (2) ti clamping pliers (55) and in the area of the mandrel (22) ■ Frictional engagement on the hose (4), intermittently »Has funding (30). 030037/0513 ο τ- α -ι VH 64-9 2. Apparatus according to claim 1, characterized in that the clamping pliers (55) has a bar (56) which can be placed against the root of the transverse seam (6) and a palter (58) which folds over the transverse seam around its root and clamps against the bar. 3. Device according to claim 2, characterized in that that the folder is designed as a plate (58) with a resilient pivot member (65). 030037/0513