Winding and unwinding appliance for strip carrying posters, especially large ones, incorporate drive shafts, driiive mechanism, spring arrangement with coiled block

摘要

The picture-changing appliance incorporates a strip with two vertical tubes for unwinding and winding parts (17, 23) which have drive shafts (18), a drive mechanism and at least one pre-tensioned spring arrangement (19). The spring arrangement comprises a helical spring coiled on a block with coils (20) at pre-set distances apart when untensioned, and at a radial distance from a pipe (21) enclosing the drive shaft and linked to an element