Method and apparatus for manufacture and inspection of swatch bearing sheets using a vacuum conveyor
An apparatus and method of high speed manufacture of swatch bearing sheets wherein each sheet is directed through various operating stations via sequentially releasing a suction force from an endless vacuum belt conveyor while sequentially pulling the sheet onto another endless vacuum belt conveyor with a suction force to allow for substantially continuous engagement of the sheet with the endless vacuum conveyors during the manufacture and inspection of the sheets.
1. A method of manufacturing swatch bearing sheets comprising:
sequentially supplying sheets to a first endless vacuum belt conveyor with a sheet feeder;
pulling the sheets onto the first endless vacuum belt conveyor with a first suction force, the first suction force pulling through discrete areas of pores in the first endless vacuum belt conveyor from downstream to upstream;
holding the sheets on the first endless vacuum belt conveyor with the first suction force as the sheets are transported in a downstream direction on the first endless vacuum belt conveyor;
sequentially releasing the first suction force of the first endless vacuum belt conveyor as the sheets approach an adhesive applying station, the vacuum being released sequentially through the pores from the downstream to the upstream direction;
applying an adhesive to the sheets at the adhesive applying station;
pulling the sheets onto the second endless vacuum belt conveyor with a second suction force pulling through discreet areas of pores of the second endless vacuum belt conveyor from the downstream to the upstream as the sheets emerge from the adhesive applying station, the second suction force engaging the sheets as the first suction force is being sequentially released and as the sheets are proceeding through the adhesive applying station;
holding the sheets on the second endless vacuum belt conveyor with the second suction force as the sheets are transported in the downstream direction on the second endless vacuum belt conveyor;
sequentially releasing the second suction force pulling through discrete areas of pores of the second endless vacuum conveyor belt as the sheets approach a swatch applying station, the second suction force being released sequentially through the pores from the downstream to the upstream direction;
depositing a swatch onto the sheets at the swatch applying station;
pulling the sheets onto a third endless vacuum belt conveyor with a third suction force pulling through discrete areas of pores of a third endless vacuum belt conveyor from the downstream to the upstream as the sheets emerge from the swatch applying station, the third suction force engaging the sheets as the second suction force is being sequentially released and as the sheets are proceeding through the swatch applying station, the sequential pulling and releasing of the suction forces allowing the sheets to be in substantially continuous engagement with the first and second endless vacuum belt conveyors during the applying of the adhesive and allowing the sheets to be in substantially continuous engagement with the second and third endless vacuum belt conveyors during the depositing of the swatch.
2. The method of claim 1 wherein the first, second and third endless vacuum belt conveyors have top surfaces which run over a first, second and third vacuum chamber each chamber having an upstream boundary and a downstream boundary spaced from the stations such that when the belts and pores therein run over a downstream boundary the suction force is released and when the belts and pores therein run over an upstream boundary the suction force pulls the sheet onto the belts running in the downstream direction.
3. The method of claim 2 wherein the sheet is transported in the downstream direction on the third endless vacuum belt conveyor for further processing which includes transporting the sheets on an endless inspection vacuum conveyor belt conveyor to an inspection station which inspects the sheets which are transported through the inspection station on the endless inspection vacuum belt conveyor.
4. The method of claim 3 , wherein the method further comprises: determining whether the sheets are reject sheets during the inspecting of the sheet at the inspection station.
5. The method of claim 4 , wherein the method further comprises: diverting the reject sheets with jets of air off of the endless inspection vacuum belt as a vacuum is being released if the inspection station determines the sheet is a reject.
6. A method of manufacturing swatch bearing sheets comprising:
sequentially supplying sheets to a first endless vacuum belt conveyor with a sheet feeder, the first endless vacuum belt including a top porous surface running over a first vacuum chamber, the vacuum chamber having an upstream boundary spaced from the feeder and a downstream boundary spaced from an adhesive applying station;
pulling the sheets onto the first endless vacuum belt conveyor with a first suction force, the first suction force pulling through the porous surface of the first endless vacuum belt conveyor from downstream to upstream as the top porous surface runs over the upstream boundary of the first vacuum chamber;
holding the sheets on the first endless vacuum belt conveyor with the first suction force as the sheets are transported in a downstream direction on the first endless vacuum belt conveyor;
releasing the first suction force of the first endless vacuum belt conveyor as the sheets approach an adhesive applying station, the vacuum being released from the downstream to the upstream direction as the belt crosses the downstream boundary of the first vacuum chamber;
applying an adhesive to the sheets at the adhesive applying station;
pulling the sheets onto the second endless vacuum belt conveyor with a second suction force as the sheets emerge from the adhesive applying station, the second suction force pulling through the porous surface of the second endless vacuum belt conveyor from downstream to upstream as the top porous surface runs over the upstream boundary of the second vacuum chamber, the second suction force engaging the sheets as the first suction force is being sequentially released and as the sheets are proceeding through the adhesive applying station;
holding the sheets on the second endless vacuum belt conveyor with the second suction force as the sheets are transported in the downstream direction on the second endless vacuum belt conveyor;
releasing the second suction force of the second endless vacuum belt conveyor as the sheets approach a swatch applying station, the vacuum being released from the downstream to the upstream direction as the belt crosses the downstream boundary of the second vacuum chamber;
depositing a swatch onto the sheets at the swatch applying station;
pulling the sheets onto a third endless vacuum belt conveyor with a third suction force as the sheets emerge from the swatch applying station, the third suction force pulling through the porous surface of the third endless vacuum belt conveyor from downstream to upstream as the top porous surface runs over the upstream boundary of the third vacuum chamber, the third suction force engaging the sheets as the second suction force is being sequentially released and as the sheets are proceeding through the swatch applying station; and
holding the sheets on the third endless vacuum belt conveyor with the third suction force as the sheet is transported in the downstream direction on the third endless vacuum belt conveyor for further processing, the pulling and releasing of the suction forces allowing the sheet to be in substantially continuous engagement with the first and second endless vacuum belt conveyors during the applying of the adhesive and allowing the sheet to be in substantially continuous engagement with the second and third endless vacuum belt conveyors during the applying of the swatch.
7. The method of claim 6 wherein the further processing includes transporting the sheets on an endless inspection vacuum conveyor belt conveyor to an inspection station which inspects the sheets which are transported through the inspection station on the endless inspection vacuum belt conveyor.
8. The method of claim 7 , wherein the method further comprises: determining whether the sheets are reject sheets during the inspecting of the sheet at the inspection station.
9. The method of claim 8 , wherein the method further comprises: diverting the reject sheets with jets of air off of the endless inspection vacuum belt as a vacuum is being released if the inspection station determines the sheet is a reject.