Suspension conveying device

A suspension conveying device comprising:

• a conveying traveling body having a conveyed object supporter, two suspension lines that suspend the conveyed object supporter, and two suspension line pulling-up/feeding means to elevate and lower the two suspension lines respectively and individually;
• the respective suspension line pulling-up/feeding means including screw shafts rotatably borne by the conveying traveling body and driven bodies engaged with the screw shafts, the driven bodies being operable to move reciprocally by forward/reverse rotation of the screw shafts to perform pulling-up/feeding operation of the suspension lines;
• a motor operable to drives the screw shafts of the respective suspension line pulling-up/feeding means to rotate forward and in reverse;
• the screw shaft of each suspension line pulling-up/feeding means having a low-speed drive region, in which a feed pitch for the driven body is small, and a high-speed drive region, in which a feed pitch for the driven body is large;
• the respective screw shafts being disposed so that the low-speed drive regions and the high-speed drive regions are disposed mutually oppositely as viewed from the driven bodies when the conveyed object supporter is at one end of an elevation/lowering stroke;
• and
• the conveyed object supporter being tilted in a middle of the elevation/lowering stroke.