초록 ▼

A feed conveyor arrangement is disclosed for horizontally unwinding zipper-equipped sheet packaging material from a supply roll and turning back a flap portion of the sheet material for reception of product prior to delivery into a form, fill, and seal machine. The feed conveyor utilizes a special g

A feed conveyor arrangement is disclosed for horizontally unwinding zipper-equipped sheet packaging material from a supply roll and turning back a flap portion of the sheet material for reception of product prior to delivery into a form, fill, and seal machine. The feed conveyor utilizes a special guide wheel device for maintaining the zipper, and hence the sheet material, in an aligned flow path and holding down the flap portion only adjacent the zipper. A subsequent flap turning wheel device turns the flap portion away from the remaining panel area of the sheet below the zipper line, pivoting the flap about the hold down area of the guide wheel device. The guide wheel device is in the form of skewed wheels acting on the upper surface of the flap at opposed sides of the zipper. The flap turning wheel device includes an offset wheel which applies both upward and horizontal forces to the upturned inner surface of the flap to open up the sheet material.

대표청구항 ▼

Apparatus for conducting a continuous elongate wrapper sheet to form, fill, and seal machine, wherein the wrapper sheet has a horizontal panel surface extending between upper and lower side edges, said lower side edge being free and said upper side edge being a web fold of sheet which partially hori

Apparatus for conducting a continuous elongate wrapper sheet to form, fill, and seal machine, wherein the wrapper sheet has a horizontal panel surface extending between upper and lower side edges, said lower side edge being free and said upper side edge being a web fold of sheet which partially horizontally overlaps the panel surface, and a reclosable zipper means in the form of a pair of cooperatively interlocked aligned strips extending horizontially of the wrapper sheet and respectively disposed on the facing upper surface of the panel surface and bottom surface of the overlapping web fold of sheet, said apparatus comprising: means for conducting said wrapper sheet horizontally over a platform between a wrapper sheet supply and said form, fill, and seal machine, means for holding down said wrapper sheet during movement over said platform comprising a pair of rotatable guide wheels respectively disposed on opposed lateral sides of said zipper means and having lower circumferential edges engaging the top surface of the overlapping web fold of said wrapper sheet adjacent opposed sides of said zipper means wherein said rotatable guide wheels are supported for rotation in corresponding journal arms about rotational axes skewed toward each other above said wrapper sheet, said journal arms disposed for rotating movement about longitudinally directed pivot shafts, and further comprising means for resiliently biasing said journal arms about said pivot shafts to press said wheel edges against said web fold and panel surface thereby holding said zipper means against said platforms, and means on said platform for positively turning up a flap portion of said web fold of sheet above said zipper means downstream of said means for holding down.