| 摘要 |
PCT No. PCT/DE87/00541 Sec. 371 Date Sep. 19, 1989 Sec. 102(e) Date Sep. 19, 1989 PCT Filed Nov. 21, 1987 PCT Pub. No. WO88/07489 PCT Pub. Date Oct. 6, 1988.A conveyor comprises an endless, flexible conveying element, a drive unit for driving the conveying element, a deflecting unit for reversing direction of movement of the conveying element, and at least one tensioning device. The tensioning device includes a displaceable tensioning element engaging the conveying element, a tensioning spring biasing the tensioning element toward the conveying element, and a unidirectional blocking mechanism which blocks a displacing movement of the tensioning element in a direction opposite the effective direction of the tensioning spring for automatic readjustment of the conveying element while maintaining the possibility of the reversing operation. The blocking action of the blocking mechanism can be cancelled by an unlocking key, and the tensioning device can be slid back into a locking position to allow the disassembly of the conveying element.
|
