DE1812019B - Spreading device for sacks - Google Patents

Description

Ends are slightly curved inwards. It is also advantageous that the spreading width of the spindle via a spindle Spreading finger is adjustable and therefore any sack formats and sizes can be used.

With reference to the figures shown in the drawings, the invention is in the following on a Embodiment described in more detail. It shows

Fig. 1 is a front view of the invention Device partially in section,

F i g. 2 shows a side view of the device according to the invention, partially in section,

F i g. 3 is a section along the line TII-III of

Fig. 1,

F i g. 4 is a section along the line IV-IV of FIG

Fig. 1.

The stand consists of a stand 1 with a cross yoke 2, on which parallel rods 3, 4 in Fixed points 5, 6 are rotatably mounted. The single ones Parts 7, 8 and 7 ', 8' of the parallel links 3, 4 are with the holding member 9 and 9 'for the spreading fingers 10 or 10 'connected, in such a way that the holding member on its Bev, egungsbahn always in a vertical Location is held. This is achieved by the fact that the free ends 11, 12 or 11 ', 12' of the individual parts 7, 8 rotatable via bolts to the

Holding members 9 and 9 'are attached. A working cylinder 13 and 13 'that can be acted on alternately acts on the outer rod parts 7 and 7'. In order to be able to design the spreading width of the fingers regularly 5, the free ends 14, 15 of the working cylinders 13 and 13 'are coupled to a spindle 16 so that these ends can be moved parallel to the stand I. This inevitably places the end position and thus the spreading width of the spreading fingers testlo.

Another device, which folds the sack in the area of the seam or deforms it in such a way that it is unhindered after spreading Closing can be done. This device is also attached to the cross-.Λ 2. she consists of two bow-like elements 17, 18 which are attached to shafts 19, 20. On the waves 19, 2 » engage via elements 21, 22 that can be acted upon alternately Working cylinder 23, 24 via which the Pivoting movement of the bow-like elements 17,18 takes place. The sack 25 moves on a conveyor belt 26 and, after spreading through the bracket-like elements 17, 18, migrates to the closure system direction 27.

1 sheet of drawings

Claims (2)

Patent claims: 1. Spreader device for filled, on a conveyor belt moving from a filling station to a sealing station with arranged in front of the sealing station, each by a four-bar linkage movably connected to a stand and each with a four-bar linkage actuating working cylinders, the spreader fingers are arranged such that they enter the respective sack as it moves, spread it and then leave it again after practicing, characterized in that the four-bar linkage is designed as a parallel linkage (3, 4) and the spreading fingers (fo. 10 '") are connected to these via holding devices (9. 9 ') are connected and that the ends (14.15) of the working cylinders (13.13') which do not engage the parallel rods are arranged so as to be adjustable in height via a spindle (16). 2. Device according to claim 1, characterized in that that the spreading fingers (10, 10 ') are curved inward at their free ends and the curvatures lie in the spreading plane. The invention relates to a spreading device for filled, on a conveyor belt of one Filling station moved to a sealing station with bags arranged in front of the sealing station, through each a four-jointed linkage with spreading fingers movably connected to a stand and each with a four-jointed linkage actuating working cylinder !!, the spreading fingers being arranged in such a way that they are at their Movement enter the respective sack, spread it and then leave it upwards again. After the bags have been filled with granular or powdery bulk goods, they are placed in usually closed by sewing or welding, depending on what material they are made of. In order to be able to design the closing safely, it is necessary to open the sack before the closing phase to be spread exactly and then fold / u or / ti at the sealing point accordingly. Ks a device has become known in which the sacks are also spread apart. This known device has two attached to four-bar guide Folds on. those in a vertical plane from two opposite sides' on are pivotable on the outside against the top of the sack. These folds work with a small distance Folding fork arms which can be pivoted in parallel planes and which engage from the inside into the sack can be pivoted outwards and during this movement in the end position with the associated Folding tongue Overlap so that the folding tongues loop the bellows into the folding forks involve. During the spreading phase, the spreading elements migrate according to Transport speed with. so that a return of the same to the starting position is necessary, to spread the following sack. In addition, bags, especially plastic bags, are often left when extending the spreading fingers stick to them because they are extended in their spreading end position remain. If a sack sticks to the spreading fingers, however, the entire workflow is immediately disrupted, so that with this known device The full capacity of the bag closing device is seldom achieved. There is also a device for sewing filled bags, sacks or similar bags become known, with the one for leaching the upper part of the sack two ίο spreader arms that can move in any direction are provided, which are higher than the incoming bag in the rest position, but in its opening after it has come to a standstill penetrate and pull them out in the conveying direction. Even with this device, it is not ensured that the spreading fingers do not get caught when extending out of the bag and pull the bag up with it. There is also a device for shaping the upper part of the sack with subsequent sewing of the same known. The device for forming the top of the sack consists of two pairs of in the Sack engaging opposite spreading elements and each one element, which of engage outside between the individual elements of a pair of spreading elements, so that a folding of the Sack top is done. This device also has acting on the broad side of the sack upper part Elements that are movably attached to a parallel linkage. This known device is very Complicated in structure and also does not ensure that the Sprcizelemente when moving out on Get the sack stuck and pull it up with you. The object of the invention is to create a spreading device with which the The spreading process is quick and safe while the spreading fingers reach deeply into the sack at the same time can unwind and which also allows adjustment of the spreading width. To solve this problem, a spreading device of the type described above is proposed, which is characterized in that its four-bar linkage is designed as a parallel linkage and their splay fingers with these on holding devices are connected and that the ends of the working cylinders which do not act on the parallel rods Are arranged adjustable in height via a spindle. According to a further concept of the invention, the spreading fingers can move at their free ends be curved inside, the curvatures lying in the spreading plane. The advantage which is achieved with the inventive device, is that an almost gradlinier distance is covered by the parallel linkage during Eintauchphasc the spreading fingers in the bag while maintaining a perpendicular right arrangement of the expansion fingers and after a certain immersion depth migration of the spreading fingers by on the outside and thus spreading of the sack takes place, with the movement process 11g also outward ^ o again due to the type and arrangement of the parallel linkage is an almost straight-line movement. After the spreading process has taken place the above-described advantageous movement of the spreading fingers is declining, so that when If the spreading fingers are extended out of the sack, it is no longer possible for them to stick to them. This advantageous phenomenon is also supported by the fact that the spreading fingers are free on their lower ones