Conveyors: power-driven – Conveyor system for moving a specific load as a separate unit – System includes a rotating or endless carrier with a load...
Patent
1994-07-15
1996-02-27
Yoan, D. Glenn
Conveyors: power-driven
Conveyor system for moving a specific load as a separate unit
System includes a rotating or endless carrier with a load...
1988035, B65G 1746
Patent
active
054941490
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a conveying device.
There is known a conveying device (DE patent 1,231,624) which serves as a conveyor for plates or panes, in particular panes of glass, and wherein the means of conveyance is made of two chains which in each instance form a closed loop in two parallel and vertical planes at some distance apart and are driven around, as well as of striplike dogs or supports which in each instance are held by a chain at either end and extend perpendicular to the plane of the loops formed by the chains. Holders designed as suction cups, which are displaceable with respect to the means of conveyance and serve for receiving and holding the plates, are attached to the supports.
No special demands are made regarding the precision of movement of the holders in this known conveying device nor, indeed, could they be achieved because the chains forming the means of conveyance, owing to the articulated connection of a plurality of chain links in longitudinal direction or direction of conveyance, require considerable play and hence result in correspondingly great inaccuracy. The deviations occurring here are also dependent upon the position in which the respective holder actually finds itself, relative for example to a driven return wheel.
In addition, the production of a metal conveyor belt of stainless steel and the welding of the two ends, for the formation of an endless conveyor belt, is likewise known in principle (DE-OS 3,109,797).
SUMMARY OF THE INVENTION
The object of the invention is to indicate a conveying device which, despite a simple structural design, permits movement of the holding device along the conveying distance with great accuracy.
A conveying device corresponding to the present invention is designed to accomplish this object.
The use of a metal belt, preferably a steel belt, which is subject to no or to no appreciable elastic elongation, makes it possible, even with a relatively great length of the conveying distance, to obtain very exact positioning of the holders at, for example work stations set up along the conveyor, without separate indexing of the holders or supports being required at individual work areas or stations for exact positioning. The metal belt with the supports and the holders provided there can also be made especially simply. Owing to the fact that the supports are provided at the outside of the metal belt and the respective holding means with their convexly curved contact surface at the inside of the metal belt, the said metal belt is likewise capable of being carried over the return wheels without kinks appearing in the metal belt.
In a preferred embodiment, the holding elements, which for example are offsets and sleevelike or pinlike elements provided on them, at the same time form a "toothing" engaging in recesses in at least one return wheel, so that slip-free, very exact positioning for the holders themselves can be obtained by stepwise drive of this return wheel.
In one embodiment of the invention the conveying device is a component of a device for the processing or treatment of electrical components. In the sense of the invention, "processing or treatment" comprises a wide range of processing or treatment possibilities for components, in particular including separation or segregation of electrical components which are made on a so-called leadframe, reshaping of components with respect to length and/or shaping of their leads, testing and/or measurement and/or sorting or controlled feeding of these components at special feeding positions based on the values detected at at least one testing and measuring station, placement of components in hoppers or containers of a sorting station, in pockets of a belt, etc.
In the processing or treatment of electrical components, these are preferably supplied, in the form of a leadframe, for example of a multiple leadframe, to a feeding station in an axial direction perpendicular to the direction of conveyance of the conveyor belt there.
If the components are belted at a feeding po
REFERENCES:
patent: 3513963 (1970-05-01), White
patent: 3841687 (1974-10-01), Banyas et al.
patent: 4135619 (1979-01-01), Cerboni
patent: 5022511 (1991-06-01), Gorrieri et al.
Sillner Kamilla
Yoan D. Glenn
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