| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a mechanism for controlling the lowering speed of the carriage of a vertical conveying device. <P>SOLUTION: A vertical conveying device 10 for lifting a carriage 16 by a hoist mechanism 24 connected to one end 22 of the output shaft of a motor 20 comprises a mechanism for controlling the lowering speed of a carriage 16. A hydraulic pump 32 is connected to the other end 28 of the output shaft of the motor 20 through a one-way clutch 30. A flow control valve 44 is disposed in a hydraulic circulation circuit 42 for connecting the discharge port 36 to the suction port 38 of the hydraulic pump 32. The one-way clutch 30 transmits the rotating force in the direction that the motor 20 lowers the carriage 16 to the hydraulic pump 32. The hydraulic pump 32 is rotated by the rotating force, discharges hydraulic oil from the discharge port 36, sucks the hydraulic oil from the suction port 38 through the hydraulic circulation circuit 42, and restrains the flow of the hydraulic oil by the flow control valve 44. <P>COPYRIGHT: (C)2008,JPO&INPIT |
