Railways – Traction – Cable
Patent
1989-05-17
1990-11-27
Basinger, Sherman
Railways
Traction
Cable
104 94, 212214, 2421582, 414277, B65G 106
Patent
active
049727788
DESCRIPTION:
BRIEF SUMMARY
The object of the invention is an arrangement relating to the cable winding device that moves the transfer vehicles of a store line or transfer line at the end of which it is installed, and in which the store line is formed by sequential store places, and in which the store line is crossed by at least one transverse transfer line, and in which the packages on the store line are transported by being carried by the lifting device of a transfer vehicle that travels on rails, and in which the aforementioned cable winding device includes a motor and a cable drum turned by it, or a corresponding cable collecting device.
International publication WO85/04638 (FI 842409) shows one type of sequential store, in which the packages are stored sequentially on top of rails and in which the transfer device that travels under the packages includes a lifting device to lift a package onto the transfer vehicle and transport it. The system includes placing devices that control the placing of the packages at the desired point on the store line. The movement of the transfer vehicle takes place with the aid of a cable winding device, which includes a cable drum driven by an electric motor. One end of the cable wound round the drum is secured directly to the transfer vehicle, and the other end also to the transfer vehicle after first passing over a pulley at the opposite end of the rails. In the aforementioned WO publication a solution is shown in which transaction is transmitted to the cable by means of only one cable wheel. However, in this slipping can take place, which makes the measurement of the placing difficult. The cable must thus be wound round the drum at least once for the grip to be sufficient. The winding point then moves laterally along the surface of the drum by at least the thickness of the cable during one revolution of the drum.
Thus the drum must be in any case so wide that it is able to wind onto its surface in one layer an amount of cable that corresponds to the entire length of the store line. In practice the cable is not wound endlessly round the drum as both cables that come to the drum end at the ends of the drum and an amount of cable corresponding to the length of the line is held on the surface of the drum. Slipping is then avoided entirely and placing can be measured reliably from the axis of the drum. The direction of winding of the cables on the drum is arranged so that as the one cable is running onto the drum the other is running off it. The surface of the drum has a spiral groove on it that directs the cable precisely to the side of the previous coil as the neighbouring coils must not press against one another. The other cable runs off the other side of the drum, which means that as the drum revolves there is always the same total number of coils on its surface.
The aforementioned WO publication does not show the arrangement of a crossing in detail. From the point of view of the use of space it is optimal that the transfer vehicles on both the store line and the transverse line are carried on rail underneath. However, the arrangement of the crossing is greatly eased if the rails of the transverse line are made to be carried on rails above. In both cases the precise operation of the cable winding device is important as the cable winding device is used to determine placing. In the previous case the crossing of the winding cables of the store transfer vehicle and the rails of the transverse line causes a problem. Because the winding point on the surface of the winding drum moves, the drum cannot be installed close to a crossing, because then the break reserved for the cables would be long. Certainly the winding drum could be placed sufficiently far outside of the line and both cables could be led from a fixed point in the direction of the line. This has two drawbacks. First of all the arrangement demands extra space, and secondly the measurement of the distance from the drum to the transfer vehicle could no longer be done linearly.
With the aid of the invention an attempt is made to achieve a cable
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Basinger Sherman
Brahan Thomas J.
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