JPS6484809A - Packaging equipment - Google Patents

Abstract

PURPOSE:To give arbitrary ductility to film by making a rotation proportional flow valve function by tension of the film on an object to be packaged, making a hydraulic motor operate, and making the rotation peripheral speed of a secondary roller larger than that of a primary roller. CONSTITUTION:One end of film (a), which is held on a roll out shaft 7, is pulled out, the film (a) is passed in order around a primary roller 1 and a secondary roller 2, and wound around an object to be packaged (b) on a turn table 8. When the film (a) is pulled by tension due to the rotation of the turn table 8, a coupling 9 in a rota tion proportional flow valve 3 function; oil in an external hydraulic circuit 11, in which a hydraulic pump 10 is built-in is taken into the rotation proportional flow valve 3 by an amount witch is proportional to the number of rotations. The oil is sent out of a G rotor 12 to a closed circuit 5. When a uniform amount of oil is sent out to the closed circuit 5, a hydraulic motor 4 rotates, and the secondary roller 2 also rotates. For example, if the rotor of the hydraulic motor 4 is set to rotate twice as much as the rotor of the G rotor, the secondary roller 2 always rotates twice as much as the primary roller 1; and the film (a) is elongated by the differential in the number of the rotations. When a valve 6 is opened, the rotation speeds of both hydrau lic motors become uniform, and the number of rotation speeds of both rollers become uniform also.