Abstract: The delivery suction arms of a transfer mechanism take the individual plastic bag segments to be stacked from a welding and cutting station, swing them to a pin conveyor belt and spindle them on the stack pins of the pin conveyor belt. Three suction arms are positioned next to each other in rows with spacing from each other, two of which grasp an individual plastic bag segment on both sides of pin holes positioned at one end of the individual plastic bags, and in stacking swing past the pin conveyor belt. The remaining or third delivery suction arm grasps the bottom of the individual plastic bag. In the travel direction of the conveyor belt a finishing mechanism is positioned following the delivery mechanism which seals the stacked bags and may provide the bags with handle-holes.

Abstract: A stack of detachably-connected, individually carryable bags of a plastic material, preferably plastic foil. Each bag has a front wall, a rear wall and an upper bag opening. The bag walls of each bag are provided with centrally positioned punch-out pieces positioned opposite each other adjacent the upper bag opening. The punch-out pieces may be removed by hand to form handle grips. The punch-out pieces of each of the bags in the ones of the bag walls that are on one and the same side of all of the bags in the stack are removed. Uniting the individual bags into a single stack without additional structural members is possible, when the punch-out pieces remaining in the stack and constructed as oblong perforations are interlocked with each other.

Abstract: The stacker provided in the stacking station immediately downstream of the cutting station of the bag making apparatus includes a transversely reciprocal needle bar provided with a plurality of needles including at least one heated blocking needle and a transversely reciprocal stripper bar through which the needles engaged. The upstream end of each bag blank is pierced by the needles as it is cut off the tube, with the downstream portion of each bag blank lying on one of the conveyor platforms. Periodically the stripper bar is moved upwardly to strip an entire stack of bag blanks off the needles. A flattening device having flattening elements engages each of the bag blanks as it cut free from the tube and presses it flatly down against the stack on the platform.

Abstract: A handle bag of a predetermined width is made from a synthetic-resin tube. This tube is fed at a predetermined feed speed through a cutting station where it is spanned over a cutting drum formed with an endless circumferentially extending and undulating cutting groove. A blade engages radially inwardly through this groove so that as the tube passes over the drum it is subdivided transversely into a pair of tube halves. The blade reciprocates back and forth transversely of the tube in the cutter groove by rotation of the drum at such a rate as to form on the confronting cut edges of the tube halves interfitting and staggered handle flaps. One of these tube halves is then detoured through a distance equal to an odd whole-number multiple of half of the bag width and then is realigned with the other tube half with the flaps in transverse alignment. The two tube halves are then seamed together simultaneously.

Abstract: Bags are made from an elongated synthetic-resin tube by an apparatus having an endless conveyor having a transport path extending from an upstream cutting/welding station through a stacking station and a flattening station to a downstream punching station. This conveyor has a plurality of platforms having predetermined lengths in the transport direction and spaced apart by gaps. The tube is fed continuously in the transport direction to the upstream cutting/welding station that periodically transversely cuts through the tube and simultaneously forms upstream of each cut a transversely weld for subdividing the tube into a succession of bag blanks. The stacker includes a transversely reciprocal needle bar including at least one heated blocking needle and a transversely reciprocal stripper bar. The upstream end of each bag blank is pierced by the needles as it is cut off the tube, with the downstream portion of each bag blank lying on one of the conveyor platforms.

Abstract: An apparatus for stacking flattened-out bags has a stacking drum rotatable in one rotational sense about a stacking drum axis at a stacking station which subdivides a conveyor into an upstream stretch that feeds the flattened-out bags one at a time to the drum and a downstream stretch which carries the stacks of bags away from the station. A pressure drum at the station is rotatable in the opposite directional sense about an axis parallel to that of the stacking drum. An axially extending array of generally radially extending pickup needles is provided on the stacking drum pointed forwardly in the respective rotational sense. An axially extending pusher bar is provided on the pressure drum and at least one spot welder is also provided on this pressure drum adjacent the pusher.

Abstract: Handle bags are made from an elongated synthetic-resin tube having two longitudinal rows of indicia spaced apart in each row by a bag width and with the indicia of one row staggered equidistant between the indicia of the other row. The tube is passed step-wise over a cutting drum formed with an endless circumferentially extending and undulating cutting groove in which a blade engaged inwardly so that an undulating cut is formed longitudinally along the tube separating it into two tube halves which are then passed through a closeable transverse welder. One of the halves is deflected between the drum and the welder through detours dimensioned to put the flaps of the two bag halves in exact transverse alignment with one another. Each transport step is ended when the center of the indicia immediately upstream of the welder is spaced from the welder by a distance equal to half of the bag width and at this time the welder is closed on the tube to form bag-edge seams.

Abstract: A flattened tube of synthetic resin is heat-sealed along a leading edge and a multiplicity of perforations are punched along an arcuate line spaced from and convex towards the sealed tube end. The tube is subsequently conveyed to a stacking station where a fusing area defined by the perforations is thermally bonded to a similar area of an underlying bag. The tube is transversely cut along a base line of the fusing area. In an apparatus implementing the method at least one perforator is shiftably mounted on a carriage upstream of the stacking station for positional adjustment parallel to and perpendicular to the direction of tube transport. A needle bar at the stacking station has several threaded bores for receiving one or more heating plugs energizing respective mandrels which traverse a lower and an upper clamping bar during an upward shift of the needle bar to pierce the plastic tube at respective fusing areas. Each bore in the needle bar is flanked by a pair of parallel needles.

Abstract: A bag-making apparatus delivers to a stacking station a succession of like flat and flexible folded shopping bags. A packaging apparatus stacks these bags at the stacking station up into a stack with the objects generally planar in the stack. The stack is then transferred to a loading cassette provided in a packaging station adjacent the stacking station and having a floor formed with an elongated throughgoing slot. An upwardly open carton is then positioned under and around the cassette and the stack is pushed out of the slot in the bottom of the floor of the cassette, temporarily deforming each of the bags from planar to U-shape as they pass through the slot. In this manner the entire stack is pushed through the slot into the carton.

Abstract: An apparatus for stacking and joining, in a stack, bags of synthetic-resin foil or sheet material comprises a press for connecting the bags together at least along one edge, a conveyor for carrying the stack of connected bags out of the press, a device for stacking the bags and for transporting the stacked and unconnected bags to the press. According to the invention, the press is stationary and the stacking device comprises a plurality of tines upon which the bags are successively deposited against an abutment, the tines being then moved downwardly to deposit the bags on a grate along which the bags are displaced by a gripper to the conveyor and into the press.

Abstract: Sections successively severed from a double layer web of synthetic thermoplastic film, e.g., flattened tube stock, as produced are each stacked and welded to a precedingly stacked section near one edge, or in a tear off part or hanger portion to which a bag portion of the section is attached; forming ultimately a pad of bag sections, wherein each section includes either a complete bag or a partially completed bag, in the latter case with certain final bag producing operations carried out simultaneously for all bags already brought together and preferably welded together in a pad structure.

Abstract: Thermoplastic film bags or like packaging sections with or without hanger holes are stacked and welded into pads from which individual bags are easily hand-torn for use. Bag sections, each with a hanger portion and having an arched cut in one wall, are produced three at a time from a continuously longitudinally sub-divided and side seam welded, wide flattened film tube stock web, after incising the cuts at three transversely spaced places in one layer; the sections are stacked and at the hanger parts welded into a pad, and the pad is transversely perforated through the incised arched cuts and hanger holes punched in the hanger part.

Abstract: High production rates and decreased wear and tear and stress on parts are obtained in a bag fabrication machine with the web fed intermittently by respective bag lengths, for operations such as perforating, transverse severing or welding with the web halted.A sector plate is oscillated between two extreme positions faster in one direction than in the other by a flywheel-carried crank pin orbiting about an axis eccentric from the plate axis; the pin engaging a block sliding in the plate radially of its axis. The plate motion is applied as input to an electrically operated clutch and brake unit and the output is applied to web advance rolls. Switches on the slide block, actuated at the extreme sector positions, control the alternating clutch and brake engagement to drive the rolls for web feed during the slower sector motion of relatively longer duration; and also declutching with braking to halt the web precisely, for and during a faster sector plate return motion.

Abstract: Sections successively severed from a double layer web of synthetic thermoplastic film, e.g., flattened tube stock, as produced are each stacked and welded to a precedingly stacked section near one edge of a tear off pat or hanger portion to which a bag portion of the section is attached; forming ultimately a pad of bag sections, wherein each section includes either a completed bag or a partially completed bag, in the latter case with final bag producing operations carried out simultaneously for all bags already welded together in a pad structure.