| 摘要 |
PROBLEM TO BE SOLVED: To keep always an appropriate constant seal pressure even in the case that a position of a seal member is varied at sealing a packing material, and realize a high quality seal against the packing material. SOLUTION: There is provided a vertical bag forming, filling and packing device having a constitution in which a pair of lateral sealers (seal members) 10a, 10b are driven to open or close through a link mechanism 14 while a servo motor being applied as a drive source and a packing material is held between these pair of lateral sealers 10a, 10b and sealed. A rotational torque of the servo motor is controlled in response to the positions of the lateral sealers 10a, 10b. The rotational torque of the servo motor is controlled in response to the positions of the lateral sealers 10a, 10b in this way, and it becomes possible to keep a constant sealing pressure irrespective of variation in positions of the lateral sealers 10a, 10b even if the positions of the lateral sealers 10a, 10b are varied as a variation in thickness of the packing material or thermal expansion of the lateral sealers 10a, 10b or the like. |
