Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1989-09-19
1991-02-26
Dayoan, D. Glenn
Conveyors: power-driven
Conveyor section
Endless conveyor
B65G 2344
Patent
active
049955063
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a conveyor comprising an endless, flexible conveying element, such as a conveyor belt or chain, or the like.
Such endless conveyors, also called conveyor or assembly belts, are used, depending on their purpose of application, for conveying bulk or piece goods, or for transporting workpieces which are generally held on a pallet.
In a known endless conveyor of this type with elastic conveyor belt (DE-OS No. 33 06 079), the tensioning device with conveyor belt guide required for keeping the endless conveyor belt tight, is constructed as a tensioning roller which is arranged in the drive station between two synchronously driven deflecting rollers. The axle of the tensioning roller is provided with two adjustable bearings which can be adjusted radially by two tensioning screws arranged laterally at the bearing frame, so that the tensioning of the conveyor belt can be readjusted manually from time to time.
SUMMARY OF THE INVENTION
The object of the invention is a conveyor comprising an endless flexible conveying element tensioning of which is maintained automatically without the necessity of re-tensioning over time. The reversing operation of the conveyor is ensured by the blocking mechanism of the tensioning device, which blocking mechanism acts on one side and is only effective in a direction which is opposite the tensioning direction. When the conveying element is driven in a reverse operation, the blocking device prevents the tensioning spring from being compressed by the tractive force of the drive. The conveying element tension last adjusted prior to the beginning of the reversing operation is maintained so as to be unchanged. If the conveyor is driven exclusively in reversing operation, the automatic re-tensioning of the conveying element is effected in the turned-off phases of the conveyor.
In an advantageous embodiment of the invention, the blocking mechanism comprises a manually actuated unlocking key for cancelling the blocking action of the mechanism. The key is used for slackening of the conveying element for assembly purposes. A lock which can be triggered as desired in the rear end position of the tensioning member when the tensioning spring is extensively compressed, which can be realized in a simple manner, e.g. by providing a locking groove at the end of a tooth row of the blocking mechanism in which groove a locking projection that can be lifted only by actuation of the unlocking key, is received ensures an easy assembly and disassembly of the conveying element when the tensioning member is installed without disassembling it beforehand.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of preferred embodiments with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a schematic partial side view of a conveyor according to the invention with an endless conveyor chain;
FIG. 2 shows a sectional view of a tensioning device along line II--II in FIG. 1;
FIG. 3 shows a section of the tensioning device according to line III--III in FIG. 1; and
FIG. 4 shows an enlarged cross-sectional view along line IV--IV in FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The chain conveyor shown schematically in FIG. 1, comprises an endless conveying chain 10 which is driven in the direction indicated by arrows in the normal operation of the conveyor by a drive 11 comprising a toothed roller or toothed wheel driven electromechanically. The drive 11 is combined together with a tensioning device 12 for the conveying chain 10 in a drive station 13. A lower portion 101 (return portion) of the conveying chain 10 runs from the drive station 13 to a deflecting roller 14, and an upper portion 102 (pulling portion) of the conveying chain 10 serving to transport runs back to the drive station 13 again from the deflection roller 14. In the drive station 13, the upper chain portion 102 is
REFERENCES:
patent: 2612988 (1952-10-01), Andrews
Langenbacher Markus
Maier Gernot
Dayoan D. Glenn
Robert & Bosch GmbH
Striker Michael J.
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