DE6907293U - SPREADING DEVICE FOR SAECKE - Google Patents

Description

Utility model registration
Spreading device for sacks

The invention relates to a spreading device
for sacks.

After the sacks are filled with granular or powdery bulk goods, they are usually, depending on the material they are made of,
closed by sewing or welding. Around
to be able to make the closing safe is
it required the sack before the closing phase
to be spread exactly and to be folded or shaped accordingly at the sealing point.

Spreading devices for sacks are known with which the spreading process is achieved in that so-called spreading fingers dip into the sack and carry out the spreading. The spreader
moves with it during the spreading phase according to the conveyor belt speed. Furthermore

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often remain bags, especially plastic bags, when extending the spreading fingers on the Stick spreading fingers because they are extended in their spreading end position. When sticking a sack on the splay fingers but the entire workflow is immediately disrupted, so that with this known spreading device rarely has a full capacity of the bag closing device is achieved.

The object of the invention is to create a spreading device with which the The spreading process can be carried out so quickly and safely that, on the one hand, the spreading fingers move along is not necessary on the bag conveyor belt and, on the other hand, when moving out the spreading fingers the sack no longer sticks to them.

To solve this problem it is proposed according to the invention that attached to a tripod A parallel linkage is attached to the yoke so that it can rotate in fixed points, which the holding device for a spreading finger and to each of which at least one alternately pressurized working cylinder, whose stroke is adjustable via a spindle, attacks.

According to a further concept of the invention, the spreading fingers can be curved inward at their free ends be, the curvatures are in the spreading plane.

With the spreading device, another device works one after the other, which is also on Cross yoke is arranged together. This device consists according to the invention of two bracket-like elements,

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which approach the sack from the outside and this in the locking area by appropriate Prepare folding or shaping for the sewing or sealing process. This bow-like Elements are attached to a linkage, which can also be acted upon alternately Working cylinder can be pivoted outwards and inwards.

The advantage of the device according to the invention is achieved is that through the parallel linkage during the immersion phase the spreading finger into the sack while maintaining a vertical arrangement of the spreading fingers an almost straight path is covered and, after a certain immersion depth, a wandering of the Spreading finger outwards and thus spreading of the sack takes place, with the movement process following outside auc'i in turn, due to the type and arrangement of the parallel rods, an almost straight line Movement is. After the spreading process has taken place, the advantageous described above takes place Movement of the spreading fingers declines, so that sticking when the spreading fingers are extended out of the sack the same is no longer possible on them. This advantageous appearance is supported by that the spreading fingers are slightly curved inward at their lower free end.

Using the figures shown in the drawings, the invention is described in more detail below using an exemplary embodiment;

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- 4 It show:

Pig. 1 is a front view of the invention Device, partly in section.

Pig. 2 shows a side view of the device according to the invention, partly in section.

Pig. 3 is a section along the line III-III of Pig. I.

FIG. 4 shows a section along the line IV-IV in FIG. 1.

On a stand 1, a transverse yoke 2 is mounted, are rotatably supported in Pestpunkten 5, 6 to the respective parallel linkage 3,4, The parts 7, 8 and 7 ', 8 ¹ of the parallel linkages 3.4 are connected to the retaining member 9 or 9 ¹ for the spreading fingers Io or Io 'connected in such a way that the holding member is always held in a vertical position on its movement path. This is achieved in that the free ends 11 ^{, 12 and II 1} , 12 'of the individual parts 7, 8 are rotatably ^{fastened to the holding members 9 and 9 1 by means of} bolts. A working cylinder 13 or 13 'that can be acted on alternately acts on the outer rod parts 7 or 7'. In order to be able to adjust the spreading width of the fingers, the free ends 14, 15 of the working cylinder or 13 'are coupled to a spindle 16 so that these ends can be moved parallel to the stand 1 and thus the stroke of the cylinders 13, 13' can be changed is. By changing the stroke, the end position and thus the spreading width of the spreading fingers is inevitably determined.

Another device works one after the other with the spreading 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 yoke 2. she consists of two bracket-like elements 17, 18 which are attached to shafts 19, 2o. On the waves 19, 2o engage via elements 21, 22 alternately acted upon working cylinders 23,24, via which the pivoting movement of the bow-like elements 17, 18 takes place. The bag 25 moves on one Conveyor belt 26 and, after spreading, migrates through the bracket-like elements 17, 18 to the closing device 27

Claims (3)

■ »· * 4 V protection claims 1.) Spreading device for sacks, in which the spreading process is carried out using spreading fingers, characterized in that attached to one on a stand (1) Yoke (2) in fixed points (5,6) rotatably a parallel linkage (3,4) is attached which the holding device (9, 9 ') for the spreading fingers (Ιο, Ίο ·) carries and to each of the at least a working cylinder (13, 13 ·) that can be acted upon alternately and whose stroke has a Spindle (16) is adjustable, engages. 2.) Device according to claim 1, characterized in that the spreading fingers (Io, Io ') at their free ends are curved inside and the curvatures lie in the spreading plane. 3.) Device according to claims 1 and 2, characterized in that that in the spread state with the spreading fingers still immersed (Ιο, Ιο ·) from the outside brackets (17, 18) operated by working cylinders (23, 24) that can be acted upon alternately, which carry an element on the underside that runs parallel to the later sealing seam, are accessible.