DE1144174B - Machine for the production of filled bags - Google Patents

Description

Machine for Making Filled Bags The invention relates to a Machine for the production of filled bags. There are already such machines or devices became known for the packaging of powdery, granular, liquid or pasty contents, in which a film over a forming shoulder and over a at the same time as a filling tube Serving form tube is drawn into a hose.

In particular, such devices have become known in which the longitudinal seam of the hose gradually depending on an elongated punch is pulse welded from the film take-off. Get the hose trigger, the upper one and lower transverse closure of the bags and their cutting off two tongs against each other and welding and cutting jaws moved up and down the length of the bag.

The pulse welding of the longitudinal seam, in which the heating of the from Stamp worn in isolation and consisting of a low-mass metal strip The heating tape and the sweat contact only lasts about 2/10 seconds is for special thin foils, e.g. B. made of polyethylene, the weld by a continuously heated Roll to be preferred, as such films, which are a few microns thick, can be placed under the heating roller soften too much and tear when peeled off.

However, impulse welding was disadvantageous in comparison to many known welding by heated rollers so far that they are not continuous Work allowed, as the punch changed when changing to a different bag length had to be, because its length had to correspond to the length of the bag, to allow multiple welds to avoid the longitudinal seam of the bag.

The inventor has set himself the task of eliminating this disadvantage with Impulse welding machine for producing filled bags to fix.

The solution was found in making the welding punch a little longer is the length of the hose or film drawn off between two welding pulses and that it also, as is known, transversely to the direction of withdrawal and also - against one Restoring force - is movable in the withdrawal direction, such that it occurs during welding contact can follow the pull movement.

Resilient pressure members are expedient on both sides of the welding die attached, which on the one hand hold the hose edges one above the other for welding and relieve the heated welds when the hose is withdrawn and over the on the other hand, the hose when pulling off the welding stamp during the welding pulse takes away.

Advantageously serves as an abutment for the welding stamp one on the filler tube arranged bar, over which an endless to roll within the filler pipe steered tape made of, as is known, the sticking preventing plastic, for. B. polytetrafluoroethylene is performed.

For the timely triggering of the welding pulse, it is advisable to the withdrawn from the supply roll film drive a measuring roller that has a Cam actuates the pulse generator.

In the drawing is an embodiment of the invention Machine shown, namely Fig. 1 is a side view of the essentials Parts, wherein the punch is lifted off, Fig. 2 shows a partial cross-section according to the line II-II of FIG. 1 on a larger scale, FIG. 3 the same cross-section, however according to the line II 1-111, the punch is in the working position, Fig. 4 a slightly enlarged section or

Partial section from Fig. 1, wherein the punch is also in the working position FIG. 5 shows a cross section along line V-V of FIG. 4.

The film 1 runs from the supply roll, not shown, between the rollers 2 and 3 through and over the pulley 4 to the forming shoulder 5, from the it is formed into a hose 7 with the help of the filler pipe 6, which then opens the tube 6 rests. The roller 3 serves as a measuring roller and is equipped with a cam 8 for the cooperation with the contact 9 for the triggering of the pulse for longitudinal welding of the hose connected. The trigger, welding and cutting jaws 13 are through unmarked means against each other like pliers and around the adjustable bag length movable up and down.

Just like the filler pipe 6, the carrier 18 is in the one not shown Machine frame held.

On the carrier 18, the rail 20 is parallelogram-like due to the tabs 21 and 22 articulated and movable in the direction of the tube 6 by means of a bolt 19. In the Rail 20, the welding punch 23 is guided in a longitudinally movable manner. Will be in rest position the welding punch 23 is held in its upper position according to FIG. 1. On stamp 23 are resilient holders 26 articulated, the task of which is on the one hand during welding to hold the edges of the tube 7 one above the other and, on the other hand, the punch 23 to be taken along with the trigger movement during welding contact.

At the ends of a longitudinal slot of the filler pipe 6 are two rollers 31 and 32 loosely rotatably mounted. An endless belt 33 is passed over them, the from a sticking-preventing material, e.g. B. polytetrafluoroethylene exists.

The belt 33 runs on a bar arranged in the slot 34. To protect the belt 33 against dust od. Ä. Inside the filling tube 6 is a Cover plate 24 is provided.

To explain the mode of operation, let us refer to that shown in FIG. 1 Stage run out. The jaws 13 have closed and thereby the hose 7 compressed and welded transversely. At the same time the one previously filled and now cut off the closed bag, which is still held in place. Then is in the hose 7 above the welding point through the filler pipe 6 a Portion of the product filled.

The jaws 13 then move closed by the length of the bag downwards and pull the hose 7 by this length over the tube 6. the the same length of the film 1 is removed from the supply roll and between the rolls 2 and 3 pulled through. At the moment where the cam driven by the roller 3 8 the contact 9 closes, the impulse for the welding of the hose longitudinal seam triggered. The punch 23 is heated and the bolt 19 presses the punch against it the tube 7 (see FIGS. 3 and 4). Before that, however, the holders 26 came on the hose to the system in order to keep its edges one above the other in a position suitable for welding. Meanwhile, the contact with the heated welding die 23 causes the longitudinal seam welded along the length of the punch 23, the bar 34 as an abutment for the stamp 23 is used. During the withdrawal movement of the hose, it slides open the ledge 34 downwards.

The moving band 33 prevents the fresh weld seam from sticking on the bar 34. In this case, the holder 26 of the stamp 23, as long as the sweat lasts, taken away.

After termination of the welding pulse, the rail 20 with the punch 23 lifted off again, and this returns to its upper starting position in the rail 20 back. The hose 7 also continues its downward movement until the Jaws 13 reached their lowest position according to the set bag length have from them in a known manner after releasing the bottom bag in their Return to the starting position.

It should be emphasized that the welding pulse through the measuring roller 3 and the contact device 8, 9 is only triggered when a length of film has been removed, which is a little shorter than the length of the punch 23. The triggering of the weld is that is, regardless of the bag length set in each case.

Claims (4)

PATENT CLAIMS: 1. Machine for the production of filled bags, at one film over a forming shoulder and over one at the same time as a filler pipe Serving mold core drawn into a tube and the longitudinal seam of the tube through an elongated punch along its length gradually depending on the hose withdrawal is pulse welded, characterized in that the welding punch (23) something is longer than the hose or hose drawn off between two welding pulses. Film length and that, as is known, it is also transverse to the take-off direction and also - against a restoring force - is movable in the withdrawal direction, in such a way that that he can follow the withdrawal movement of the hose during the welding contact. 2. Machine according to claim 1, characterized in that both sides of the welding die (23) resilient pressure members (26) are attached, which on the one hand For welding, hold the hose edges one above the other and keep the heated welding points on top of each other Relieve the trigger of the hose and on the other hand the hose during the trigger takes the welding stamp with it during the welding pulse. 3. Machine according to claim 1 and 2, characterized by an as Abutment for the welding stamp (23) serving, on the filler pipe (6> arranged Bar (34) over which an endless roller (31, 32) within the filling tube (6) guided band (33) made of a plastic that prevents sticking, as is known, z. B. Polytetratluoroethylene, is performed. 4. Machine according to claim 1, 2 or 3, characterized in that the withdrawn from the supply roll film (1) drives a measuring roller (3), which over a cam (3) actuates the pulse generator (9). ~~~~~~~~ Publications considered: German Patent Nos. 665571, 884 725, 894 215; USA. Specification No. 2899875.