B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/31
B31B 23/14 (2006.01) B29C 65/00 (2006.01) B29C 65/20 (2006.01) B29C 65/78 (2006.01) B31B 19/10 (2006.01) B65H 23/192 (2006.01)
Patent
CA 1310847
ABSTRACT An apparatus for controlling machines for making bags or sacks which have been severed by welding from continuous tubular or semitubular films or synthetic thermo- plastics comprises at least one pair of pinch rollers for feeding the continuous film, which pinch rollers are driven via a transmission by a motor, and also comprises a pair of welding jaws for providing the continuous film with seam welds, transverse seam welds or severed transverse seam welds, a second motor for actuating said pair of welding jaws via a drive mechanism, and optional further cutters and the like, which are provided with drives. A central processing unit is provided, by which the motors are controlled in such a manner that the motor for the pair of welding jaws is energized even at a time at which the motor for driving the pair of pinch rollers, and after the standstill phase of the motor for driving the pair of pinch rollers the latter motor is energized even before the motor for driving the pair of welding jaws has stopped.
570634
Marks & Clerk
Windmoller & Holscher
LandOfFree
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