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A Stirling engine includes a grooved cam drive mechanism with followers having a pair of longitudinally displaced bearings. One roller bearing is adapted to ride along an upper surface of the cam groove, while the other roller bearing is adapted to ride along a lower surface of the cam groove. Each

A Stirling engine includes a grooved cam drive mechanism with followers having a pair of longitudinally displaced bearings. One roller bearing is adapted to ride along an upper surface of the cam groove, while the other roller bearing is adapted to ride along a lower surface of the cam groove. Each follower includes an outer shaft on which a first bearing is mounted, and an inner shaft extending through the outer shaft on which a second bearing is mounted. A preferably annular space is provided between the inner and outer shafts when the follower is in an unloaded state. Then, when the follower is engaged within the grooved cam, the inner shaft is cantilevered relative to outer shaft within the annular space and results in pre-loading the first bearing against one inner surface of the groove cam and the second bearing against an opposite inner surface of the grooved cam.

대표청구항 ▼

A Stirling engine includes a grooved cam drive mechanism with followers having a pair of longitudinally displaced bearings. One roller bearing is adapted to ride along an upper surface of the cam groove, while the other roller bearing is adapted to ride along a lower surface of the cam groove. Each

A Stirling engine includes a grooved cam drive mechanism with followers having a pair of longitudinally displaced bearings. One roller bearing is adapted to ride along an upper surface of the cam groove, while the other roller bearing is adapted to ride along a lower surface of the cam groove. Each follower includes an outer shaft on which a first bearing is mounted, and an inner shaft extending through the outer shaft on which a second bearing is mounted. A preferably annular space is provided between the inner and outer shafts when the follower is in an unloaded state. Then, when the follower is engaged within the grooved cam, the inner shaft is cantilevered relative to outer shaft within the annular space and results in pre-loading the first bearing against one inner surface of the groove cam and the second bearing against an opposite inner surface of the grooved cam. n thus be placed at cooler positions of the exhaust-gas system that are less exposed to vibration and can nevertheless determine the pollutant concentration at another position. hin 20 seconds of impulse sealing. 7. A horizontal FFS packaging machine as described in claim 4 wherein said chiller further comprises a thermal medium maintained at a temperature of 65°±15° F. 8. A horizontal FFS packaging machine as described in claim 7 wherein said thermal medium is recirculating cooling water. 9. A horizontal FFS packaging machine as described in claim 1 wherein said packaging machine is a vacuum packaging machine having, during dwell time at said sealing station, an evacuation and sealing cycle concurrent with which the zipper blank is longitudinally sealed. 10. A horizontal FFS packaging machine as described in claim 1 wherein said packaging machine is a modified atmosphere packaging machine having an atmosphere modification cycle wherein the zipper blank installation is concurrent with the atmosphere modification cycle thereof. 11. A working station for a form-fill-and-seal (FFS) packaging machine, said machine having a frame and means for conveying two layers of packaging film therealong from, an input side to an output side, said FFS packaging machine forming one or more tracks of packages, said working station comprising, in combination: a shell for housing temperature-controlled operations; at least one sealing die in said shell, each said sealing die completely sealing, during a controlled cycle time therefor, packages formed on one of said tracks of packages; at least one channel-forming die in said shell and alongside said sealing die and isolated therefrom by a wall therebetween, each said channel-forming die, in turn comprising: aperture-forming means for forming an aperture to receive a zipper blank therewithin, said aperture being between said two layers of packaging film; an impulse sealer in said channel-forming die for impulse sealing, upon introduction of said zipper blank into said aperture, said two layers of packaging film and said zipper blank; whereby the working station installs the zipper to the package during the controlled cycle time provided for the sealing of the package. 12. A working station as described in claim 11, wherein said working station further comprises a lifting device and said channel-forming die further comprises: spring means in cooperative functional relationship with said lifting device lifting said packaging film at said impulse sealer beyond the level of said packaging film at said sealing die. 13. A working station as described in claim 12 wherein said packaging film at said impulse sealer is lifted 5 mm. beyond the level of said packaging film at said sealing die. 14. A working station as described in claim 11 wherein said channel-forming die further comprises: a chiller in said shell for dissipating the energy of impulse sealing and maintaining the zipper blank free from thermal shock during installation thereof. 15. A working station as described in claim 14 wherein the zipper blank returns to ambient room temperature within one minute of impulse sealing. 16. A working station as described in claim 15 wherein the zipper blank returns to ambient room temperature within 20 seconds of impulse sealing. 17. A working station as described in claim 14 wherein said chiller further comprises a thermal medium maintained at a temperature of 65°±15° F. 18. A working station as described in claim 17 wherein said thermal medium is recirculating cooling water.