DE2900242A1 - IMPROVED BAG OPENING MACHINE - Google Patents

Description

The invention relates to a machine for opening bags which are spaced apart with a pair having opposing rotatable needle rollers which are driven against each other grab a bag and transport it down past a cutting device, the cutting device cuts through the bag in a substantially vertical plane to reveal the contents of the bag. the Opposite halves of the cut bag are pulled out of this plane by the needle rollers transported.

Ks are different types of such machines known for opening bags, which have the advantage that the two needle rollers are spaced from one another to the desired extent.

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can be separated so that bags of various sizes can be accommodated. Especially with bags with The problem with smaller sizes is that they cannot always be centered exactly.

The aim of the present invention is to make such a machine for opening bags so that the the aforementioned disadvantage is largely eliminated.

According to the invention a machine for opening bags is characterized in that the machine has two having oppositely arranged guide plates which are arranged so that their upper ends are freely rotatable about axes which are above and parallel to the axes of the two needle rollers, their lower ones Ends sliding on the peripheral surfaces of the two needle rollers and if there is no bag in the machine, the lower ends of the plates face inwards, on top of one another are assigned directed.

The invention will be described with reference to the figures, which represent an example of the machine for opening bags .

Fig. 1 shows the machine in side view;

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FIG. 2 shows the machine in section along the line II-II according to FIG. 1.

As can be seen from the figures and in particular from FIG. 1, the machine has for opening bags two spaced apart rollers 10 and 11, which are opposite to each other and whose Axes lie in a common horizontal plane.

The rollers 10 and 11 are provided with needles projecting on the periphery, which are described below Serve purpose.

Each of the rollers 10 and 11 is received at the opposite ends in bearings, which in from mutually dependent arms 13 are arranged. The upper ends of the arms 13 are pivotally attached, whereby the Rollers 10 and 11 along upwardly directed, arcuate Can be moved away from each other because of. At the upper ends of the arms 13 are gears 14 and 15 arranged, which are connected to the rollers 10 and 11 or are in engagement and ensure that during the divergence of the rollers 10 and 11, each roller from a vertical center plane P the same distance having.

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Between the rollers 10 and 11 lies horizontally in the Level P a reciprocating saw blade 16. When the machine is in operation, a not shown is used Motor to move the saw blade back and forth.

A motor 17 is connected via an endless chain to a gear 18 which is rotatable about the axis of rotation of the Arms 13, which are connected to the roller 11, are arranged and which is connected to a drive wheel 19 and a further gear wheel 20. The drive wheel 19 is in engagement with a drive wheel 21 which is connected to a gear 22 which rotates around the axis of rotation of the arms 13 connected to the roller 10 is rotatable. The gears 23 and 24 are at the ends of the rollers 10 and 11 arranged and driven via endless chains between them and the gears 23 and 20, in turn, the To drive rollers 10 and 11 in the direction of arrow X.

The guide plates 30 and 31 provided are rotatable mounted on the top of the machine about the horizontal, spaced axes 32 and 33. The plate 30 protrudes downward so that its lower end is in contact with the peripheral surface of the roller 10 and the plate 31 protrudes downward so that its lower end is in contact with the peripheral surface of the roller 11.

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As best seen in Figure 2, each panel 30 and 3I is recessed at its lower edge 34 provided, which are arranged and dimensioned so that the protruding on the rollers 10 and 11 needles 12 can pass and at the same time a continuous contact between the lower ends of the plates 30 and 31 with the peripheral surfaces of the rollers 10 and 11 is made possible, while the latter are rotated via the drive from the motor 17.

The outwardly facing surfaces of the panels 30 and 31 encircle slide blocks 35 at their lower ends to reduce the resistance on the surface of the rollers 10 and 11.

The arrangement is such that when there is no tea bag in the machine, the rollers 10 and 11 are under the influence the gravity take an inner position with the smallest possible distance and the plates 30 and 31 with assign their lower ends to each other.

The bags to be opened are introduced into the machine through the opening between the axes 32 and 33. The bags are through the plates 30 and 31 so down the rollers 10 and 11 are fed so that they arrive centrally above the knife 16.

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The bags are gripped on opposite sides by the needles of the rollers 10 and 11 and pulled downwards over the reciprocating knife 16, and thus cut into two parts in the vertical plane P, releasing their contents. The retained by the needles 12 of the rollers 10 and 11, mutually opposite bag halves are brought the I ^v iaschine on the opposing sides, where they are drawn off by a suitable Hechanismus by the rollers 10 and 11 '

It will be understood that the machine is capable of handling a variety of different bag sizes and that this in arbitrary. Order in the machine can be inserted, each bag with the help of the opposing guide plates 30 and 31 correctly is centered.

The invention is not intended to be restricted by the example described above, but rather are further variants conceivable that do not deviate from the area outlined in the claims.

So z. B. instead of the devices for pulling the cut bag halves from the rollers 10 and 11 devices be arranged, which pull in the needles on the outer sides of the ¥ alzen__durchumsflachen, so that the bag helped ten release lasser ^ eyrg ^ ^

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Furthermore, ζ. B. the rollers 10 and 11 not Swivel arms can be mounted on the lower ends, but can also be used for outward movement be arranged on ramps or in slots that are provided with bearings.

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Claims (3)

1. machine for opening bags with two, one Spacing from one another, opposing, rotatable Niade! Rollers, which are driven against one another grab a bag and transport it down past a cutting device, the Cutting device cuts through the bag in a substantially vertical plane around the contents of the bag and fold the opposing halves of the cut bag through the needle folds this plane are transported, characterized in that the machine two opposite one another has arranged guide plates (30, 31), the upper ends of which are freely rotatable about axes 90 98 28/0923 BATH ORIGINAL - 1 - Zs (32, 33), which are above and parallel to the axes of the two needle _{rollers (10, 11) (} and the lower ends of which are in sliding contact with the peripheral surfaces of the two needle rollers (10, 11) in such a way that the plates (30, 31) when there is no bag in the machine, are inclined inward and with their lower ends facing each other. 2. Machine for opening bags according to claim 1, characterized in that each of the guide plates (30, 31) is provided on the lower edge with recesses (34) which are so arranged and dimensioned are that the needles (12) protruding from the rollers (10, 11) can pass and continuous contact between the peripheral surface of the roller and the lower end the plate resting against this roller is possible. 3. Machine for opening bags according to claim 2, characterized in that the lower end each guide plate (30, 3'0 with blocks (35) from the Friction-reducing material is provided, which is provided with the surface of the roller on which the respective plate rests, is in contact. - 2 909828/0923