Abstract: Bag segments arriving one after the other in a travel direction at an upstream input station are first lifted one by one as they arrive at the input station, are inverted them, and are deposited in a stack at a downstream stacking station atop one of a pair of similar pin-type stacking carriages held at an upper level. The one stacking carriage and the stack carried thereby are periodically displaced downstream from the stacking station to a downstream station at the upper level and the other stacking carriage is raised in the stacking station from a lower level below the one carriage to the upper level with the one carriage such that the segments are subsequently deposited on the other carriage in the stacking station. The one carriage is then lowered in the downstream station from the upper level to the lower level to strip off the stack it carries and thereafter is displaced at the lower level back upstream to the stacking station.

Abstract: A stack of interlocked detachable bags, preferably formed from a thermoplastic foil strip, and each comprising two walls, a front wall and a back wall, preferably at least one handle-shaped incision positioned on one of said walls adjacent an upper filling opening, wherein the individual bags each have an interlock piece and are attached together with the aid of at least one interlock means engaging their interlock pieces, and by means of a row of perforations forming an edge of the interlock piece the individual bags are detachable from the interlocked stack by tearing off. On one of the walls of each bag adjacent an upper filling opening edge of that bag a reinforcing piece, preferably of plastic foil, with the interlock piece is attached so that the interlock piece protrudes above the filling opening edge. Advantageously the inside of the back wall is provided with the protruding interlock and reinforcing pieces.

Abstract: An apparatus for applying transverse welds on a plastic foil web in dependence on the print register is provided with a conveyor which is advanced by means of a control unit intermittently and synchronously with respect to a welding unit. The control unit includes a drive disk whose eccentric pin is adjustable and guided by an eccentric block. Via a coupling rod, the drive disk is connected to a rocker which is accommodated in a gear segment and whose oscillation is adjustable by a spindle. The gear segment cooperates with the conveyor via a clutch-brake unit which provides the intermittent advance of the conveyor by uncoupling from or connecting the latter with the gear segment and is controlled by a plurality of contactless switch elements. For precise adjustment of the advance of the conveyor, the spindle cooperates with a motor which operates in dependence on the print register as monitored by a photocell.

Abstract: A stack of interlocked detachable bags, preferably formed from a thermoplastic foil strip, and each comprising two walls, a front wall and a back wall, preferably at least one handle-shaped incision positioned on one of said walls adjacent an upper filling opening, wherein the individual bags each have an interlock piece and are attached together with the aid of at least one interlock means engaging their interlock pieces, and by means of a row of perforations forming an edge of the interlock piece. The individual bags are detachable from the interlocked stack by tearing off. On one of the walls of each bag adjacent an upper filling opening edge of that bag a reinforcing piece, preferably of plastic foil, with the interlock piece is attached so that the interlock piece protrudes above the filling opening edge. Advantageously the inside of the back wall is provided with the protruding interlock and reinforcing pieces.

Abstract: The invention is a tear away block of thermoplastic carrying bags in which each of the carrying bags have a front wall, a back wall and two handle grip punch outs in the vicinity of an upper entrance opening. The carrying bags are provided with a sinusoidal shaped entrance opening which bounds a central sine wave region with two handle grip punch outs. A rectangular reinforcing piece of plastic foil is glued on at least one wall of the carrying bags in the vicinity of the handle grip punch outs. The carrying bags are combined in the tear away block with the aid of at least one interlocking heat seal joint in an interlocking section in each of the carrying bags and may be torn away from the tear away block by a row of perforations.

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: An apparatus for forming aligned front and rear hand holes in the front and rear panels of a bag according to the invention has a support having a front face and an oppositely directed rear face adapted to respectively support the front and rear panels of the bag and formed with respective aligned front and rear annular recesses of a shape corresponding to that of the hand holes to be cut. Respective annular front and rear outer holddowns are engageable with the respective faces for pressing the respective panels thereagainst around the respective recesses. An annularly continuous front cutter blade is engageable in the front recess and an annular but discontinuous rear cutter blade is engageable in the rear recess. A rear inner holddown is also engageable with the rear face within the recess.

Abstract: An apparatus for the manipulation of plastic bags output from an automatic bag machine comprises an input conveyor for receiving bag elements from the bag machine, a delivery unit having two outer turnstiles spaced from one another according to the width of the bag elements, and a stacking unit. The turnstiles have suction arms to firmly hold bag elements taken from the input conveyor. The bag elements are depositable on the intermittently operated stacking unit. The stacking unit comprises an endless stacking conveyor belt provided with a plurality of pegs thereon, these pegs being spaced from one another according to the stack size. The stack-conveyor belt comprises two conveyor chains with the aforementioned pegs attached thereto, said chains being spaced from one another with a passage space therebetween. The delivery unit further comprises an additional middle turnstile and this middle turnstile is movable through the passage space between the conveyor chains.

Abstract: An apparatus for making plastic handle bags from an advancing flat tubular web includes a knife supported above the moving web and reciprocated transversely by a cam roller to produce a sinusoidal-wave-like cut longitudinally of the web. A support guide having a slot at least as wide as the wave amplitude is positioned beneath the web so that in the event of an interruption of feed the guide lowers, withdrawing the web from the knife, which continues to reciprocate, thereby avoiding start-up inertial friction or chatter. Downstream of the cutting station a detour assembly phase shifts one of the half-tubes 180.degree. to align the transversely extending bag edges for heat sealing. The cutting support assembly is longitudinally movable of the web.

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: An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a vertically displaceable upper welding element which has an upper upstream welding tool extending across the strip and an upper downstream welding tool generally parallel thereto, and a blade fitted in the tool element to project downward from the upper tools.

Abstract: An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a transport device for conveying the workpiece longitudinally in a transport direction along a path, a lower welding tool along the path beneath the upper tool, and a heater for at least one of the tools. A conveyor belt extending along the path downstream of the tools has a horizontal conveyor surface positioned to receive the workpiece after same is conveyed by the transport device past the welding tools. A holddown roller rotatable about a horizontal axis is displaceable vertically above the conveyor surface. A drive connected to one of the welding tools and to the transport device, conveyor belt, and holddown roller generally synchronously vertically and codirectionally displaces the one welding tool and the holddown element and synchronously horizontally and codirectionally displaces the conveyor surface and holddown element.

Abstract: An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a transporter for conveying the workpiece longitudinally in a transport direction along a path, an upper vertically displaceable welding element along the path having relative to the direction an upper upstream welding tool extending across the path and generally parallel thereto an upper downstream welding tool, and respective vertically displaceable lower upstream and downstream welding tools vertically aligned with the upper upstream and downstream tools. A blade extends transverse to the path between one of the upstream tools and the respective downstream tool. Displacement together of the tools with a workpiece between them welds the workpiece together along upstream and downstream seams at the respective tools and cuts the workpiece across with the blade between the seams, and away from one another frees the severed downstream end section of the workpiece.