Material or article handling – Plural – static structures for supporting discrete loads and... – Load-underlying members
Patent
1989-03-09
1991-07-23
Valenza, Joseph E.
Material or article handling
Plural, static structures for supporting discrete loads and...
Load-underlying members
414279, 414495, B65G 100
Patent
active
050339281
DESCRIPTION:
BRIEF SUMMARY
The object of this inventiion is a method of eliminating the accumulation of errors in the placing of packages in a computer-controlled consecutive store, in which method the packages in the store are stored consecutively on a base on top of the rails of the transfer vehicle and in which in order to remove a package in the centre the packages in front of it must first be moved out of the way, and in which the transfer vehicle includes a lifting device, which lifts the package to be moved onto the transfer vehicle ready for transportation. The invention is also concerned with the realization of the method in the transfer vehicle.
Finnish Patent Application No. 842409 and Patent No. 47559 show some kinds of consecutive stores, in which the packages are stored consecutively on top of rails and in which the transfer vehicle that travels freely beneath the rails includes a lifting device to take a package onto the vehicle for transportation. The system includes placing devices that control the placing of the packages onto the desired position on the store line. In the first-mentioned application this is realized with the aid of a computer and a pulse-sensor device connected to it. In this the accuracy of the placing is even of the order of 1 mm. despite this the inaccuracy of the placing becomes significant in certain cases. Principally this applies to such stores in which there are at least two store lines and transfer lines connecting them, which makes the automatic circulation of packages possible. If certain packages are stored for long times on such store lines from which there are otherwise many collections these long-term storage packages must be moved and circulated even hundreds of times. The known transfer vehicles in this kind of store cause the accumulation of an error in placing. In practice this leads to the situation in which the position of the package begins to gradually slip away from the calculated position on the store line and finally incorrect operation arises because of this when the transfer vehicle places itself at a significantly different position to that of the package to be lifted. The problem thus arises from the multiplication of a small error many times in the same direction. Generally this small errors takes place when the transfer vehicle lifts the package off the rails when it is not placed accurately in the centre of the vehicle. In practice the error has been observed to arise when the transfer vehicle arrives at the place of the package to be lifted always from the same direction.
By means of the invention it is attempted to eliminated the accumulation of the previous depicted error in the placing of a package. A centering on the store line carried out once is not always sufficient, if the store line is so long that in through circulation the package may exceed the placing tolerance area. In this the transfer vehicle carries out the centering of the package in connection with each lift. First of all this has the advantage that the centering measure required is quite small. Secondly the combination of centering with the operation of the lifting device is advantageous because the system does not then demand external control for centering. In the disclosed embodiment, these the correction movement is carried out in connection with each lift and the position of the package is corrected immediately if it has moved a predetermined amount from its calculated position, that is if it is outside of the area of tolerance. The centering devices shown in FIGS. 3-6 are especially advantageous for the reason that only the very small force of the sensor is directed onto the package, for the sensor being a freely turning switching device it can be turned out of the road of the sliding device. In the case of weak packages, for example wooden platform, this is important as they may not necessarily withstand shifting taking place from the edge of the platform.
In what follows the invention is illustrated by reference to the accompanying illustrations, which show some of the forms of applicatio
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patent: 3357582 (1967-12-01), Wittek
patent: 3647014 (1972-03-01), Wilke et al.
patent: 3800963 (1974-04-01), Holland
patent: 3809268 (1974-05-01), Lutz
patent: 4042127 (1977-08-01), Brossia
patent: 4637770 (1987-01-01), Swadell
Dixon Keith L.
Valenza Joseph E.
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