Conveyors: power-driven – With means to facilitate working – treating – or inspecting... – Means engaging conveyor or load on a conveyor to align load...
Patent
1988-11-11
1991-03-26
Skaggs, H. Grant
Conveyors: power-driven
With means to facilitate working, treating, or inspecting...
Means engaging conveyor or load on a conveyor to align load...
1983461, B65G 1564
Patent
active
050021753
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a lifting and positioning device for platelike workpiece carriers. Such a device is known from the DE-PS 32 44 924. The transporting device for workpiece pallets shown in the latter comprises a conveying means which rotates in a guide duct and carries the pallets which are guided in the guide duct. A stopping and positioning device is assigned to every processing station and comprises a stop, which is movable in the conveying path for stopping a pallet, as well as locking bars which cooperate with wedge-shaped or conical stop surfaces of the pallets, lift the respective pallet from the conveying means and fix it in a predetermined position. The known lifting and positioning device is arranged below the guideway of the conveying path and to the side of the guide duct. The stop surfaces assigned to the pallet are formed at two cylindrical pegs which face downward. Platelike projections with wedge-shaped locking surfaces serve as locking bars. Two locking bar plates, which are movable into the duct, are provided on one side of the guide duct, one stationary locking bar plate being located opposite each movable locking bar plate beyond the duct. Both the movable locking bar plates and the stationary locking bar plates cooperate with the defined stop surfaces of the cylindrical pegs.
SUMMARY OF THE INVENTION
In the lifting and positioning device according to the invention, two stop surfaces are formed on opposite lateral defining surfaces of the workpiece carrier plates. Two rails provided with locking bar surfaces are arranged on both sides of the transporting path. At least one rail moves transversely to the transporting direction of the workpiece carrier. The device according to the invention has the advantage that the surfaces of the workpiece carrier plate and the locking bar rails coming into contact with one another are relatively large. Accordingly, it is possible to leave the workpieces, which are to be processed or outfitted, on the workpiece carriers when strong vertical forces occur during the processing or outfitting. This is the case, for example, during pressing or riveting operations. Relatively large forces can be absorbed by the contacting surfaces of the workpiece carriers and locking bar rails without impairing the accuracy of the positioning of the workpiece carriers and, accordingly, of the workpieces located on them. The thickness of the locking bar rails need not be greater than that of the carrier plates, or, if so, only to an inconsiderable degree, so that the work area remains free of interfering superstructural parts and is easily accessible from all sides.
For an exact positioning of the workpiece carrier with a simple construction of the positioning means, it is particularly advantageous that horizontally extending stop surfaces and locking bar surfaces, respectively, which serve to lift the workpiece carrier from the conveying path, be formed at every workpiece carrier and at every rail, and that at least one rail and one stop surface of the workpiece carrier, which stop surface is located opposite the rail, be provided with surfaces for fixing the workpiece carrier in the conveying direction, these surfaces being disposed vertically relative to the conveying direction. In order that the lifting and positioning device is also capable of absorbing very high forces without damage, it is provided that it comprise an arrangement for supporting the workpiece carrier which is lifted from the conveying path and fixed.
DESCRIPTION OF THE DRAWINGS
Additional features and advantages of the present invention would become more apparent from the description of a preferred embodiment which follows with reference to the appended drawings wherein:
FIG. 1 shows a top view of the lifting and positioning device for workpiece carriers, which is constructed as a constructional unit. FIG. 2 shows the device in a side view, partially in section, of the device with a workpiece carrier which is stopped, but not yet fixed. FIG. 3 shows a sectional
REFERENCES:
patent: 3646656 (1972-03-01), Zilahy et al.
patent: 4095687 (1978-06-01), Shaiket
patent: 4217978 (1980-08-01), Stalker
patent: 4706796 (1987-11-01), Chambers
patent: 4736830 (1988-04-01), Hofmann
patent: 4757890 (1988-07-01), Motoda
Drexel Peter
Hauser Helmut
Maier Gernot
Rothfuss Peter
Gastineau Cheryl L.
Robert & Bosch GmbH
Skaggs H. Grant
Striker Michsrl J.
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