Plastic bag are stacked as they are received from a bag making machine by a radial arm transfer wheel whose suction arms engage the bags by transferring edges thereof and with the ends of the arms so that the bags are pressed onto needles of needle bars on a needle bar basket. The needle bars are rotated, with the bags suspending therefrom the spindling position through an intermediate position into a smoothing and removal position in which the hanging stack is lifted to a horizontal orientation and smoothed by a beam movable above the stack and having a smoothing brush engaging the stack. In this latter position a stripper is shifted past the needle bar therefrom. The stack is carried away by a clamp.
A device for stacking and delivering plastic bags, especially for stacks to be fed to automatic packaging machines and used in conjunction with a bag making apparatus. The conveyor has needles piercing through the bags which are stacked on the conveyor and a gripper hand can engage the stack to remove it from the conveyor. The gripper hand has a stripping aid engaging the stack in the region of the needles to facilitate withdrawal of the stack from the needles.
An apparatus for providing transverse weld seams and transverse detaching cuts or for providing detaching weld seams on a tubular or semi-tubular web of thermoplastic synthetic resin, and for stacking the detached sections includes a transverse welding and transverse detaching station for detaching sections having bottom weld seams and any leading head weld seams from the web and a stacking station for retaining or fixing the supplied sections. The web is moved intermittently. To cool the trailing weld seams of the sections without causing the sections to stick together adjacent to the bottom weld seams during stacking, a drum is provided which rotates about a transverse axis between the transverse welding and transverse detaching station and the stacking station. The wall of the drum includes at least two wall parts. The drum is adapted to be driven in step with the welding process by rotating the drum through an angular increment related to the number of wall parts of the drum in each revolution. In synchronization with stacking the cut sections at the stacking station, a path is formed for allowing the web to be pushed through gaps between the wall parts of the drum between the transverse welding and the transverse detaching station and the stacking station.
Apparatus for automatically removing bags from a supply conveyor and stacking a predetermined number of bags upon raised pins. The stacks are then placed on a stack transfer assembly that is then moved into a transfer station wherein the stacks are placed on wickets. An endless accumulator conveyor is arranged to deliver the wickets into the transfer station in timed relation with the movement of the transfer assembly between stations.
The invention relates to a method and a device for continuously producing, handling and filling bags (8), especially bags for handling by automatic machines, formed from a thermoplastic line of film. The aim of the invention is to facilitate handling in the logistical sequence between the bags (8) being produced and being filled and to improve the quality of the bag stacks (6). To this end, the bags (8) are attached (22) in places, then held in place in the area of a packing machine by holding elements (31) which interact with suspension holes (18). The attachment (22) on the bag stack (6) is then removed, after which the bags (8) are filled. The filling movement releases the bags (8) from the holding elements (31) and the bags (8) are finally sealed. The bags (8) are advantageously separated by a clamping and pulling-apart apparatus located in the area of the packing machine.
An apparatus for accumulating a stack of bags having wicket receiving holes comprises a paddle wheel conveyor for placing bags, a motorized stacker wheel adjacent the paddle wheel conveyor to receive the placed bags from the paddle wheel, a plurality of stacker bar units each rotatably mounted to the stacker wheel and a pick up head operatively positioned adjacent said plurality of stacker bar units for receiving the stack of bags from one of the stacker bar units. The pick up head has two tubes that receive and maintain alignment of the bags, a restraining jaw for restraining the stack of bags on the tubes and a pusher plate for pushing the stack of bags off the two tubes.
