B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/31
B31B 19/02 (2006.01) B31B 19/10 (2006.01)
Patent
CA 2026099
ABSTRACT APPARATUS FOR CONTROLLING MACHINES FOR MAKING BAGS OR SACKS An apparatus is described for con- trolling a machine for making bags or sacks, which are severed by hot-wire welding from tubular or semitubular webs of synthetic thermoplastics, which machine com- prises a pair of web-feeding rollers, which are driven by a motor directly or via a transmission, a pair of welding jaws, which serve to form seam welds, transverse seam welds or hot-wire-welded transverse seams in the web and are operable by a second motor via a transmission, and which machine optionally comprises additional pro- cessing means which are provided with drive means and may consist, e,g., of punching means, perforating knives and/or receiving means or stacking means. The control apparatus comprises a central processing unit for controlling the motors so that the motor for the pair of welding jaws is energized at a time at which the motor for driving the pair of feed rollers is still energized. After a standstill period of the motor for the pair of feed rollers that motor is already energized before the motor for the pair of welding jaws has stopped. In order to permit an adjustment of the output rate of the machine up to a maximum output rate, the speed of the pair of feed rollers is variable as desired for an increase or decrease of the time required to feed the web in a length corresponding to the length of a bag or sack.
Feustel Helmut
Marks & Clerk
Windmoller & Holscher
LandOfFree
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