| 摘要 |
PURPOSE:To position a conveyed material in a target place even if the fluctuation of weight exists in the conveyed material by starting to brake a carriage by a control means on this side by a distance corresponding to detected weight from a target position. CONSTITUTION:A travel sensor 34 and a load cell 39 are connected to a trolley control section 72. While monitoring output of a timing generator TG2, a servomotor driver 721 energizes a transverse travel motor 33 in a direction and at speed indicated by a controller 6. At this time, a deceleration starting distance shown by transverse travel speed and a suspending load at that time is read out from a deceleration graph where the deceleration starting distance is stored as a function of the speed and the suspending load. It is compared with coordinates of a present position of a crane carriage while using coordinates obtained by subtracting this deceleration starting distance from target coordinates as a deceleration starting position, and when the coordinates of the deceleration starting position and the coordinates of the present carriage position become equal to each other within an allowable range, the transverse travel motor 33 is braked by a relay driver 722. |
