DE2627381A1 - Equipment for stacking plastics article - has vertically movable centring station with rotatable supports for container bottoms - Google Patents

Abstract

Equipment for stacking plastic articles with rotation non symmetrical bottom part includes intermittently moving pallets with openings with to fit the outer shape of the stacked articles. The equipment is provided with a centralising station (7) which is vertically movable and is fitted with rotatable supports (11) formed to suit the shape of the articles bottom. Opposite the supports (11) of the centralising station (7) are mounted spring loaded plates (17).

Description

DEVICE FOR STACKING

OF PLASTIC ARTICLES The invention relates to a device for Stacking of plastic items that are manufactured by deep drawing or injection molding. The articles are re-sorted and fed to the stacking device and issued as a stack.

One such device is the DT-Ghm 7 329 737, which can be used for Cups as well as flat parts such as plates.

It consists of circulating pallets with openings that form the outer contour are adapted to the articles to be stacked. The pallets move in the correct Location of articles lying in the breakthroughs at the stacking station, where they are passed in stacking channels.

A disadvantage of this device is that it only allows articles can be stacked whose base frame is rotationally symmetrical.

Articles with a base that is not rotationally symmetrical are e.g.

Cups that consist of two separate chambers, as in the DT-Gbm 7 241 616 or in DT-Gbm 7 321 118. Even with plate-shaped or Cup-like articles can be molded in transverse webs for subdivision. When stacking, it is necessary that the same areas of the articles lie on top of one another come, e.g. footbridge on footbridge. This is not the case with the known device for stacking the case, since the articles in any position - from their rotation about the central axis - ago viewed - can lie in the openings in the pallets.

It is the object of the invention to design the stacking device so that even articles that do not have a rotationally symmetrical bottom shape, can be stacked. 1 This is achieved by a centering station, Consists of axially displaceable and rotatable recordings that shape the floor the article are customized. The articles are rotated in this centering station around its central axis, so that all articles are aligned in the same way after being rotated. Now they can be stacked in one another without any problems by transferring them into stacking channels.

In a further development of the invention, spring-loaded plates are proposed, which are arranged opposite the receptacles and against which the articles are pressed, as long as they are not in the correct position for recording.

An embodiment of the invention is based on the schematic Drawings described in more detail. 1 shows a side view of the stacking device 2 shows a cross section through the centering station (section A - A) in various forms Work phases.

Fig. 3 is a plan view of that used in Figs. 1 and 2 as an example Article Fig. 4 'another article, when stacked, the inventive Device must be used.

The stacking device essentially consists of the base frame 1, a revolving pallet belt 2 with individual pallets 3 on both sides Transport chains 4 are attached, a cyclical working, not shown Drive for the intermittent transport of the pallet belt 2 and. for movement of the ejector 5 and from stacking channels 6.

According to the invention, the stacking device is provided with a centering station 7 provided. In this centering station 7 is a lifting device, for example a cylinder 18 is provided. He moves a plate 9 on the rods 10 rotatable rest. The rods 10 each carry a receptacle 11 on the other side, which is adapted to the shape of the floor of Article 12. The rods are guided 10 in a bar 13. All of the rods 10 carry a wide gear 14. These together meshes a rack 15, which with a drive, for example a cylinder 16, is in operative connection.

Spring-loaded plates 17 can be arranged over the individual articles 12 depending on the shape of the article -12 and its bottom area advantageous. The purpose of the plates 17 is to prevent the articles 12 pressed against them to prevent twisting as long as the recordings do not yet match the article bottoms and rotate relative to articles 12. If they match, the plates press 17 the article 12 in the recordings 11.

In practice, you can also work without the spring-loaded plates 17, must then, however, choose the speed of the recording 11 so that on the one hand a sufficient rotation takes place between article 12 and receptacle 11 - due to whose inertia, on the other hand, the speed is not + high so that the + to article 12 has time to fall into the receptacle 11 by its own weight, if this the is in the correct position to him.

The workflow is as follows: The items to be stacked are 12 in the feed area of the stacking device, this can be done directly be done from the molding machine. All correct with the outer contour in the breakthroughs Articles 12 that are lying flat pass the transfer wheels 18, articles 12 that are incorrectly positioned are thrown back until they arrive in the right position. The Pallets 3 and the articles 12 lying in them are fed to the centering station 12. In Fig. 2, the alignment of an article 12 is shown in four phases. In this The example shown is intended to divide Article 12 into two transverse chambers to the Direction of passage can be aligned. An article 12 is coming as shown in the centering station so that the subdivision is in the direction of passage runs (illustration A). By lifting the receptacle 11, the article 12 comes up to stand this is lifted with this and comes to the spring-loaded counter-plate 17 to lie that gives way. (Illustration B).

The receptacles 11 are now rotated via the rack 15 by two turns. After one revolution at the latest - in the example shown after 1/4 or 3/4 turns - (because the chamber is asymmetrically divided) - it is correct Shape of the receptacle 11 with the bottom shape of the article 12 match, so that a nesting takes place (illustration C). The receptacle 11 is rotated further up to the predetermined one End position (subdivision transverse to the direction of flow, illustration D).

It also twists Article 12. Now the receptacle 11 travels downwards, the pallet 3 is moved on to the stacking station.

This is followed by the return of the rack 15, but this can also be done when next cycle, as the direction of rotation when rotating the item 12 is arbitrary.

In the stacking station, the articles 12 are pushed into stacking channels 6. Since the subdivisions are all the same, all of the items 12 can fit into one another be stacked.

Each pallet 3 has several openings in the transverse direction, depending on Size of the article 12. Two rows of openings per pallet 3 are provided.

Fig. 3 shows the top view of that used in Fig. 2 as an example Article. In Fig. 4 a cup flattened on one side is shown for its stacking a centering station is also required.

Claims (2)

PATENT CLAIMS Device for stacking plastic items with Non-rotationally symmetrical floor area, consisting of circumferential, cyclical Moving pallets with openings that correspond to the outer contour of the items to be stacked are adapted, characterized by a centering station (7) with height-adjustable and rotatable receptacles (11) which are adapted to the contour of the bottom of the article to be stacked are. 2) Device according to claim 1, characterized by in the centering station arranged, spring-loaded plates (17) opposite the receptacles 11.