Packaging machine and method of packaging articles
A packaging machine comprising an orientation system for orientating an article within a package, the orientation system comprising at least one carriage ( 240 ) moveable about an endless path comprising a working reach and a return reach, a drive mechanism for propelling the at least one carriage about the endless path, an engagement member ( 250 ) for frictionally engaging with an article (B) in a package ( 1 ), the engagement member moveable between an engaged position and a disengaged position wherein the engagement member is rotationally driven by a rotary drive mechanism comprising a first component ( 244 ) rotationally mounted to the carriage and a second component ( 234 ) which engages with the first component such that the first component rotates as the carriage is driven about the endless path.
1. A packaging machine comprising an orientation system for orientating an article within a package, the orientation system comprising:
at least one carriage moveable about an endless path, the endless path comprising a working reach and a return reach;
a drive mechanism for propelling the at least one carriage about the endless path;
an engagement member for frictionally engaging with and rotating the article in the package, the engagement member being moveable between an engaged position and a disengaged position;
wherein the engagement member is rotationally driven by a rotary drive mechanism comprising;
a first component rotationally mounted to the at least one carriage; and
a second component;
wherein the second component engages with the first component such that the first component rotates as the at least one carriage is driven about the endless path, and wherein the engagement member is coupled to the first component by at least one pair of gear wheels such that a direction of rotation of the engagement member is opposite to a direction of rotation of the first component.
2. The packaging machine according to claim 1 wherein the orientation system comprises a controller coupled to a sensor for collecting information concerning the orientation of the article in the package and coupled to an actuator for moving the engagement member between the engaged position and the disengaged position.
3. The packaging machine according to claim 2 wherein the controller comprises a memory device for storing reference information about the article, and a processor for comparing the information from the sensor with reference information stored in the memory device.
4. The packaging machine according to claim 3 wherein the controller comprises a calculator for calculating a parameter indicative of an angle through which the article disposed within the package is required to be rotated in order to place the article in a predefined orientation.
5. The packaging machine according to claim 4 wherein the parameter is one of the following: a time period for which the engagement member is to be engaged with the article; a distance for which the engagement member is to be engaged with the article; an angle through which the article disposed within the package is required to be rotated; a number of rotations of the engagement member.
6. The packaging machine according to claim 2 comprising a learning station coupled to the controller wherein the learning station comprises a recorder for recording the appearance of at least some of the article.
7. The packaging machine according to claim 6 wherein the learning station comprises a rotation platform for rotating the article through at least one full rotation whilst recording an image of the article.
8. The packaging machine according to claim 1 wherein the drive mechanism comprises a chain or belt driven by an electric motor via a drive wheel or sprocket.
9. The packaging machine according to claim 1 wherein the drive mechanism comprises an electric motor mounted to the carriage and coupled to the first component of the rotary drive mechanism.
10. The packaging machine according to claim 1 wherein the engagement member comprises a friction wheel mounted upon a swing arm which is pivotally coupled to the carriage.
11. The packaging machine according to claim 10 wherein an actuator is pivotally coupled at one end to the swing arm and is pivotally coupled at a second opposing end to the carriage.
12. The packaging machine according to claim 11 wherein the actuator comprises a piston and a cylinder.
13. The packaging machine according to claim 12 wherein the piston is coupled to the swing arm and the cylinder is coupled to the carriage.
14. The packaging machine according to claim 12 wherein the cylinder is a single acting cylinder.
15. The packaging machine according to claim 12 wherein the cylinder comprises a biasing device for biasing the piston towards a retracted position within the cylinder.
16. The packaging machine according to claim 12 wherein the cylinder is a double acting cylinder for driving the piston from a retracted to an extended position and from the extended position to the retracted position.
17. The packaging machine according to claim 12 wherein the piston and cylinder are driven pneumatically, hydraulically or electrically.
18. The packaging machine according to claim 1 wherein the second component of the rotary drive mechanism comprises a chain, toothed belt or rack.
19. The packaging machine according to claim 1 wherein the first component of the rotary drive mechanism comprises a sprocket or gear wheel, or friction wheel for engaging with the second component of the rotary drive mechanism.