Packaging machine

Abstract

The present invention relates to a packaging machine having at least one working station which has a lower and/or an upper tool, being vertically movable on lifting tables and the lifting table having a vertically displaceable plate onto which the lower tool is mounted, at least one vertical guide for said plate, a crankshaft, a bar, one end of which being connected rotatably about at least one axis to the plate and the other end rotatably to the crankshaft, and a rotatable drive driving the crankshaft.

1 . A packaging machine, having at least one working station ( 2 ,  7 ,  10 ) which has a lower and/or an upper tool ( 3 ,  8 ,  12 ), the lower tools ( 4 ,  9 ,  11 ) being vertically movable on lifting tables, characterized in that the lifting table has 
 a vertically displaceable plate ( 13 ) onto which the lower tool ( 4 ,  9 ,  11 ) is mounted,    at least one vertical guide ( 15 ) for said plate ( 13 ),    a crankshaft ( 20 ),    a bar ( 17 ), one end ( 18 ) of which being connected rotatably about at least one axis to the plate ( 13 ) and the other end ( 19 ) rotatably to the crankshaft ( 20 ), and    a rotatable drive driving the crankshaft.    
     
     
         2 . The packaging machine according to  claim 1 , characterized in that the bar ( 17 ) is arranged in the center of plate ( 13 ).  
     
     
         3 . The packaging machine according to  claim 1  or  2 , characterized in that the crankshaft on its right and left runs on bearings in yokes ( 21 ,  22 ).  
     
     
         4 . The packaging machine according to any of  claims 1  to  3 , characterized in that the vertical guide ( 15 ) is comprised of a bar, preferably of two bars, with four bars being particularly preferred.  
     
     
         5 . The packaging machine according to  claim 4 , characterized in that each one yoke ( 21 ,  22 ) runs on bearings on two bars ( 15 ) in a vertically displaceable fashion.  
     
     
         6 . The packaging machine according to  claim 5 , characterized in that each yoke rests on two spring elements ( 26 ).  
     
     
         7 . The packaging machine according to  claim 6 , characterized in that one spring element ( 26 ) is mounted to one bar ( 15 ) each time.  
     
     
         8 . The packaging machine according to  claim 6  or  7 , characterized in that the spring elements ( 26 ) are elastomeric springs.  
     
     
         9 . The packaging machine according to any of  claims 1  to  8 , characterized in that driving is performed using an electric motor, preferably a servomotor, and preferably via a toothed belt.  
     
     
         10 . The packaging machine according to  claim 9 , characterized in that the motor has a retention momentum of >10 Nm.  
     
     
         11 . The packaging machine according to  claim 9  or  10 , characterized in that the motor can be rotated in two directions.  
     
     
         12 . The packaging machine according to  claim 11 , characterized in that the crankshaft is rotated alternately in a clockwise and counterclockwise fashion by 180° at maximum.  
     
     
         13 . The packaging machine according to  claim 12 , characterized in that the angle of rotation of the crankshaft is adjusted in such a way that the tool ( 4 ,  9 ,  11 ) is lowered by only such a level that the package trough is not damaged as it moves further on.  
     
     
         14 . The packaging machine according to  claim 13 , characterized in that the top edge of the tool ( 4 ,  9 ,  11 ) during lowering is lowered by only 1-10 mm below the bottom edge of the package trough.  
     
     
         15 . The packaging machine according to any of  claims 1  to  14 , characterized in that the lifting time is 1 second at maximum, preferably 0.5 seconds at maximum.  
     
     
         16 . The packaging machine according to any of  claims 1  to  12  and  15 , characterized in that the spacing ( 25 ) corresponds to at least half the depth of the package trough ( 6 ).  
     
     
         17 . The packaging machine according to any of  claims 1  to  16 , characterized in that the packaging machine includes a means to avoid squeezing of products between upper and lower tools.  
     
     
         18 . The packaging machine according to  claim 17 , characterized in that the means comprises a limitation of the admissible consumption of power during the upward motion of the lower tool.