DK150132B - DEVICE FOR STACKING OF FLAT OBJECTS - Google Patents

Description

150132

The present invention relates to an apparatus for stacking flat articles such as bags or hose pieces, preferably of slack and / or light curling material, which apparatus comprises a double belt conveyor composed of spaced apart and parallel to each other single belts, the area of the forward turning roller seen in the conveying direction is provided with blowing air nozzles which are directed in the conveying direction and blowing the articles outwards, and includes a stacking table or a stacking belt conveyor which is arranged below the yield end of the double conveyor conveyor, as well as a movable stop for the consecutive articles for limiting the stack face.

In an apparatus of this type known in the United States patent 2,261,972, the flat objects from the double conveyor belt are thrown into a stacking shaft, in which the front wall and the side walls are placed in oscillations of 15 vibrators, so that the flat objects which are said to swims on the blowing air, gets edged in staff. ment shaft.

This known stacking apparatus is only suitable for stacking relatively rigid objects which neither skips during return 20 nor is deformed in front of the stack limiting stop due to their kinetic energy. The known apparatus is unsuitable for stacking bags or hose pieces of slack and / or thin or curable material because during the return it will move such objects in an uncontrollable manner and give the objects an estimate.

It is the object of the invention to provide an apparatus of the type specified in the preamble, and with which also articles of loose or light or curable material are stackable.

According to the invention, this is achieved by providing suction air nozzles which rotate about the axis of the lower turning rollers 30 and which are adapted to be able to suck the rear end of the articles before they exit from the double belt conveyor and release the articles after a turning to below the range of the blowing air nozzles.

With the apparatus according to the invention, articles of slack or light or curly material can also be deposited for orderly stacking of the articles, the articles being held extended over the stack site by the blowing air flow and being slowed down by the suction air nozzles until the articles are closed. No. 2,013,322 folded below the plane of the blowing air flow, so that the articles after their release may fall gently down on the stacking site or the stack being formed substantially without the influence of blowing air and moving energy.

05 From DE presenting specification 2,040,549, a stacking apparatus is known for flat articles, where the flat articles during the stacking are fixed at their rear ends by a roller provided with suction openings. Hereby, the flat objects to be stacked by a suction conveyor are set off in turn on a bottom edge, standing 10 on the leading edges, and the suction roller is provided with suction nozzles only over its half perimeter and the other half is provided with blower air nozzles. The roller engages the flat articles supplied in a vertical direction with its suction nozzles in the end area of the articles, thereby pulling them off from the suction belt conveyor. As the roller rotates, the puff air nozzles after extraction blow air into the slot between the drawn flat article and the suction belt conveyor so that the article is pulled completely away from the suction belt.

Except that this known apparatus is relatively expensive, it is not suitable for stacking flat articles of loose, light and curable material, as these cannot be stacked upright on the high edge.

According to the invention, the lower turning rollers are conveniently mounted freely pivotally on a shaft, the suction air nozzles being radially arranged such that they are between the turning rollers and communicating with an axially extending suction air duct in the shaft. The orifices of the suction air nozzles are approximately in a tangential plane of the turning rolls, so that the suction air nozzles, when passing through the conveying plane of the articles or articles, can trap the objects in the area at their rear edges. In this connection, a control is provided which delivers the objects to the double belt conveyor in such a way that the suction nozzles' passage of the conveying plane coincides with the passage of the rear edge regions of the articles in time. The rpm of the suction air nozzles is also adjusted according to the flow rate of the objects.

Several suction air nozzle rows may also be arranged at an angle of 55 to each other.

In the following, an embodiment of the invention will be described in more detail with reference to the drawing, in which figure 1 is a side view of a schematically shown stacking apparatus according to the invention and figure 2 is a plan view of the end band of the double belt conveyor shown enlarged.

A hose foil web 3 of slack or flexible, lightweight thermoplastic plastic material is advanced by means of pull-up rollers 1, 2 and is fed to a transverse separating station 4, 5 which is arranged after the pull-rolls 1, 2 seen in the transport direction. The transverse welding station consists of a separable seam tray 4 which can be moved up and down, and a corresponding welding roller 5.

The individual pieces separated from the separator seam are inserted between an upper conveyor belt 6 and a lower conveyor belt 7, the turning roller 8 lying on the separating seam 4 for the upper conveyor belt 6 being designed as tipping rollers to extract any items that are stuck to the separating seam. Both the upper and lower conveyor belts 6, 7 consist of several spaced apart belts. The two turning rolls 9 and 10 in the front of the conveyor direction 20 for the conveyor belts 6 and 7 are provided with a plurality of annular grooves or grooves, in which blowing air nozzles 11 and 12 are passed through and direct the blowing air so that the individual parts of the belts 6 and 7 are carried. so far outward from the blowing air flow that they can fall freely onto an underlying conveyor belt 13. This conveyor belt 13 is provided with a stop 14 which restricts the path of the articles in a horizontal direction and which can be pulled up by a piston-cylinder unit 15, when a stack 16 is formed which is to be carried away by the belt 13.

In order to achieve that the individual blanks are not deformed against the impact 14 even with flaccid or flexible material, the ends of the individual blanks 17 are gripped and slowed by suction air nozzles 18, shortly before the blanks exit from the belt pair 6, 7, and the blanks are moved downwardly toward the stack 16 by rotating the nozzles clockwise. As soon as a blank 17 has taken the position shown in FIG. 1 35 in dotted line, the suction air is interrupted and the blank can then fall freely onto the stack 16.

As can be seen from Figure 2, the control of the suction air of 4 is carried out as follows: The shaft 19 of the turning roller 10 in the lower conveyor belt has a through-bore 20. Between or in annular grooves formed between the individual ties in the conveyor belt 7, the suction air nozzles 18 screwed into the shaft 19 on a side so that the nozzles 05 are in communication with the bore 20. At the end of the shaft 19 is mounted a pivot valve 21 which has an opening angle of approx. 80 °. The shaft 19 itself performs one revolution per minute. bag or item. For the sake of speed equalization, several freely rotating belt rollers 22 are mounted on the shaft 19 and the belts in the conveyor belt 7 run over these rollers. The conveyor belt 7 is driven by the turning roller at the welding roller 5, while the shaft 19 is driven through a curve disc 23 which is connected to the shaft 19, for example through a chain or a V-belt.

Figure 1 shows that on the curve disc 23 there is a roller 24 which 15 is attached to an arm 25 which is pulled down by means of a spring 26, so that the roller 24 is continually pressed against the curve disk 23. The arm 25 which is mounted at 27, carries an angular bracket 28, the free branch of which projects over the stack 16 being formed or releases this stack according to the position of the curve disc 23 20. Hereby it is to be achieved, partly that the blank 17 can slide freely down on the stack 16, namely when the holder 28 is pivoted back, and partly that from the blowing air nozzles 11 and 12 the blowing air cannot reach between the already deposited items. The arm or holder 28 thus serves as a so-called wind deflector and is designed so that the steel-25 bellows side facing the blower air nozzles 11 and 12 is completely covered.

Finally, it should be noted that the upper fan air nozzles 11 protrude from the belt pair 6, 7 in the direction of transport, while the lower fan air nozzles 12 are shorter so as not to interfere with the emitters 17.