Device for transporting flat, especially plate-like objects

Details Device for transporting flat, especially plate-like objects Device for transporting flat, especially plate-like objects

1999-03-22

2000-08-15

Bidwell, James R.

Conveyors: power-driven

Conveyor section

Having means to enhance the friction or adherence between...

1986901, B65G 1746

Patent

active

061021911

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a device for the transport of flat, in particular platelike articles, according to the preamble of patent claim 1.
Such a device is known from DE-A-21 64 859. For the suspended transport of objects, this device has, as a transport band, a flat belt which is provided with vacuum profiling, the objects to be transported being pressed or sucked onto the flat belt by means of a vacuum. In order largely to avoid leakage points in the vacuum system and grasp the objects firmly and effectively, the known device has a vacuum chamber with a smooth underside, in which an elongate slit is made. Below the underside of the vacuum chamber, there is provided, in the first place, a basic band having orifices which are arranged at a distance from one another and, during the movement of the basic band, are located directly below the elongate slit of the vacuum chamber. This basic band possesses, on its underside, a layer of elastic material with orifices which correspond to the orifices of the actual transport band designed as a flat belt, but are larger than these and form suction heads, by means of which the flat objects are grasped by the transport band under the effect of the vacuum in the vacuum chamber. Slip is unavoidable in this device, despite this design, thus leading to restricted positioning accuracy, which is a disadvantage, particularly in the case of high transport speeds and accelerations. Moreover, when relatively heavy objects are being transported, the transport band cannot be prevented from at least partially sagging downward, thus impairing the operating capacity of the vacuum system.
Such a device is also known from DE 295 15 857 U1. This device has a revolving flat belt equipped with suction cups which are connected to a vacuum source and on which the objects rest. Devices of this type, with a flat belt having a vacuum system, are suitable, in principle, for the transport of nonmagnetic objects. However, after the vacuum source has been switched on, vacuum sealing in the case of flat belts of this type cannot take place automatically due to the belt design, thus resulting in a delay in the action of the vacuum after the source has been switched on. The flat belt itself may have slip due to its design, thus leading to restricted positioning accuracy, which has an adverse effect, in particular in the case of high transport speeds and accelerations.
DE 41 05 388 A1 discloses a device for grasping and transporting objects by means of a number of platelike carriers combined to form a revolving conveying chain, each carrier having, on its transport side, at least one intake orifice connected, at least over part of the transport path, to a stationary suction duct which can be closed off in an airtight manner relative to the atmosphere and which leads to a vacuum source, and the carriers being guided adjustably in guide rails which receive edge regions of the carriers, said edge regions running parallel to the direction of transport. This device is relatively complicated, since the means of transport consists of a plurality of individual carriers to be assembled together. A similar device is known from DE 37 01 564 C1.
DE 39 37 668 A1 discloses a conveying device for the horizontal transport of vessels, which is designed as a slat conveyor. In this case, a vacuum conveying plane is provided by arranging suction ducts between the upper strand and the lower strand, the interspaces present at the connection points of the individual slats of the slatted chain forming the intake orifices for the intake duct. This device is designed, in particular, for the horizontal transport of light plastic bottles or the like and not suitable for the suspended transport, of, in particular, heavy objects.
DE 39 08 279 A1 discloses a holding or adhesion device which serves for lifting and/or pivoting objects, but is not designed, and is not suitable, as a transport device in the sense of a transport band. The holding or adhesion device may have both magnetic elements and suction means as the holding or ad

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patent: 3998448 (1976-12-01), Gray et al.
patent: 4804081 (1989-02-01), Lengardt
patent: 5036969 (1991-08-01), Gasbagnati
patent: 5819907 (1998-10-01), Simkowski

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