Abstract: A corrugated plastic box and a method for manufacturing a corrugated plastic box from a blank are provided. The method includes the steps of forming rounded edge seals on the perimeter edges of the blank, pre-sealing portions of the blank to form a plurality of areas in which major and minor flap slots and a glue tab are desired, ultrasonically scoring the blank to form a plurality of flap score lines, and cutting the blank through the plurality of pre-sealed flap slots and glue tab, leaving a sealed edge.

Abstract: An apparatus for making a self-opening bag pack includes a supply of film material. An extruder forms a continuous tube of film. A flattener flattens the tube. A corona treater treats at least one surface of the flattened tube. A first sealer forms a bottom seam across a width of the flattened tube. A cutter cuts the flattened tube into bag blanks at a predetermined distance from the bottom seam. A stacker forms the bag blanks into a bag pack. An adhesion knife penetrates the bag pack and adheres adjacent bag blanks together in the bag pack. An aperture maker forms means for suspending the bag pack from a dispensing rack. The pack is attached to the dispensing rack and the front wall of the subsequent bag will be adhered to the rear wall of a first bag, thereby causing the first bag to open when pulled from the rack.

Abstract: A machine for making bags from sheet material of indeterminate length, especially thermoplastic material, has a pair of spaced folders of special construction for folding the material lengthwise. The entry end of the machine can be adjusted as to height. An applicator for adhesive tape can be positioned between the folders. A special construction thermowelds the folded layers together along transverse lines and severs or perforates them along those lines.

Abstract: The envelope comprises layers of plain un-coated kraft paper and of bubble-wrap polyethylene. A stack of the layers is joined at the marginal edges of the envelope by squeezing the stack between a pair of points-dies, which are formed with points that puncture the kraft paper but do not puncture the polyethylene. The points push crowns of un-punctured polyethylene through the punctured boles in the paper. Then, the marginal edges are squeezed flat between flat-dies, the flat-dies being heated enough to cause fuse-bonding. The margins of the finished envelope are held together not only by fuse-bonding, but by the presence of the crowns, which, penetrating right through the holes in the paper, serve as mechanical rivets.

Abstract: A stack of sheets, e.g. cardboard, with each sheet having lines of cut longitudinally and/or transversely. Apparatus for breaking the nicks connecting two edges of line of cut on the stacked sheets includes a first support and transport moving longitudinally and a first clamp thereabove for clamping the sheets, a first device for separating the clamped sheets along a transverse cut line. A second support and transport device moves the sheets thereat transversely until positioned so that the longitudinal line of cut is positioned so that the sheets may be clamped and the stacked sheets may be separated transversely along the longitudinal line of cut. A conveyor for shifting the sheet transversely to reposition the longitudinal line of cut for separation.

Abstract: A plastic bag making machine which includes a web sensor, a push station, a sealing and cutting station, and a wicketer and stacking station has its punch apparatus is carried on a punch carriage movable in a direction transverse to the web feed direction and its conveyor carrier on a conveyor carriage movable in such transverse direction.

Abstract: The invention relates to a method and a device for interlocking stackwise plastic bags, especially bags for automatic machines, by welding, wherein welding is effected by an interlocking device (21) integrated into the grip hand (17) of a robot (16) with the purpose of simplifying welding.

Abstract: The invention relates to a process for removing stacks of bags from a chain of stacks of bags and a device for carrying out this process. According to the invention, in a removal station the stack of bags is grasped by a robot arm by means of grippers. The hollow core of a pin is expanded in such a manner by means of a robot-sided mandrel with expandable peripheral surface that the clamped pin lock is loosened; and then the stack of bags is lifted off the supporting web by means of robot-sided grippers.

Abstract: The invention relates to a process for collecting bags, in particular packaging bags made of plastic. According to the invention, the bags are tacked offset in succession on a supporting web via a lip, formed on their open side, thus forming a chain of bags. Furthermore, the invention relates to a device for carrying out the process, a chain of bags, as well as a chain of stacks of bags.

Abstract: 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.

Abstract: The present invention relates to a foil-bag producing and packing apparatus comprising at least two feed means for feeding foil material, a connecting means for connecting the foil material fed, the connecting portions—in a direction transverse to the feed direction—extending over the foil width, a cutting means for cutting the connected foil bags along the connecting portions, and a storing device which directly after the cutting process stores the foil bags substantially in the direction of movement of the cutting edge and stacks the same in a receiving means. Moreover, the invention comprises a corresponding method for producing and packing foil bags.

Abstract: A process for bag manufacture of a bag having a first dimension from a sealed bottom of the bag to an open top of the bag, the bag being fabricated from a continuous tube of plastic film bag material. The process includes the steps of providing a continuous tube of plastic film bag material. The side edges of the bat material are folded between a front bag panel and a rear bag panel to form gussets. A sealing station having apparatus for placing two parallel and spaced apart seals and a knife for cutting the continuous tube of the plastic film bag material between the two parallel and spaced apart seals; First adjacent double seals are formed across the front bag panel and the rear bag panel, the double seals in parallel side-by-side relation with one another with the plastic film bag material there between. The continuous tube of plastic film bag material is at least twice the first dimension from the sealed bottom of the bag to the open top of the bag.

Abstract: A method of and an apparatus for producing stacks of bags where, instead of connecting the position of the foil web, a marking on the foil web is detected and used to correct the positions of the devices which operate on the web. These devices can include a cutter for removing a strip from the upper layer of the flattened blown tubular web, the punch for punching holes in the lower layer, and the device for infolding are among the devices controlled in response to the marking. The latter can be printed on the web as it is unrolled or formed during the extrusion or foil blowing process.

Abstract: The machine (1) is provided for production of containers (8) having a trapezoid or triangular form in plane, starting from two films (4) of plastic material superposed on each other. The machine (1) comprises a work station (6) provided with a pair of heat sealing and cutting-out elements (18) extending in directions converging towards each other and transverse to the feed direction of the films (4) so as to simultaneously form two adjacent containers (8) disposed in an inverted relationship with each other in the plane of the films (4). The containers (8) are simultaneousLy removed from opposite sides of the work station (6) by respective removing means (7) provided with clamps (22) and are then released from the clamps (22) and fitted on pairs of underlying needles (36) thus forming stacks.

Abstract: A bag forming machine includes draw rolls for drawing a folded plastic web to and through a cut and seal unit for forming of successive bags. A wicketer receives the individual bags and rotates to carry successive bags to an opposite discharge end and depositing of the bags onto a pin stacker. A wicket conveyor includes an endless chain with an input sprocket adjacent the discharge end of the wicketer and a discharge sprocket located in spaced alignment to a discharge end of the conveyor. A plurality of pin stackers are secured in equi-spaced relation to the chain. A high response AC servo motor located at the input end of the conveyor is connected via a chain to the input sprocket. An independent servo controller is connected to energize the AC servo motor. A multi-axis servo controller is connected to servo drives for operating servo motors connected to the draw roll, the cut and seal unit, and the wicketer.

Abstract: An apparatus, method, and pack of tabless, self-opening bags with flapless aperture cutouts pack. In the apparatus and method, cylindrical dies connected to a vacuum source are used to cut out plugs of holes, and the plugs are evacuated to a receptacle. Compression bars, or a relatively shallow bevel cut on the cylindrical die, are used to form area of frangible bonding in the central tab portion of the bag pack. The pack of tabless, self-opening bags with flapless aperture cutouts has no flap portions which might inadvertently detach from bag pack.

Abstract: A system for receiving tubular formed film comprising two facing walls and forming plastic bags having headers, open mouths and sealed bottoms into a block or stack of bags. The system includes an opener means for severing a spaced perforation on only one wall of the film to make a bag with an open mouth.

Abstract: A sideweld bag making has a reciprocating seal bar and a roller. Drive rolls upstream of the seal bar moves a web in steps over the roller and seal bar seals and severs the web to form bags. A cooling plate between the drive rolls and sealing bar includes a web strip and control air stream tube directs a special stream to engage the raising seal bar to strip the severed web therefrom and to engage the leading web edge as it moves through the seal bar unit. The stream source has closely spaced openings to form the stream; the width and character of which is controllable for selective web engagement. A second air tube is located beneath the web and directs the air stream over the sealing roller to further release the web during the movement of the web.

Abstract: A sideweld bag making machine utilizing a rotary transfer device and wicket conveyer is equipped with screw adjustable transfer wicket pins. The bases for the transfer wicket pins are mounted on a threaded rod having two sections of thread, each of opposite hand. Rotation of this threaded rod affects the separation of the wicket pins. Adjustment of vertical position is accomplished by means of two jacking screws or a screw adjustment in conjunction with a motion limiting rail element.

Abstract: A system for suspending a pack of thermoplastic bags, loading bags, removing loaded bags and for automatically opening the next bag preparatory to loading it by having a pack of handled bags suspended from laterally spaced elongated rods of a rack. A novel gradually releasably adherent bond is created between the rear wall of a leading bag and the front wall of a following bag in the bag pack. As the leading bag is removed from a bag rack, the bond will gradually and fully open the mouth and body of the following bag for loading.

Abstract: A bag pack comprises a plurality of easy open handle bags. The bags are easy to open because the exterior surfaces of the bags are cold-welded together so that when one bag is pulled from the pack, the adjacent next bag is at least partly open. The external surfaces of the bags are not welded to the internal surfaces of the bags during the pressure welding process, because the material that forms the external surface of the bag is treated with a corona discharge, which renders the external surface more susceptible to cold weldings. Optionally a static charge is induced on the bags so that each bag is at a different voltage than the adjacent bags so the bags attract each other, and the panels of each individual bag repel each other, to contribute to the easy open feature.

Abstract: The invention provides self-opening polyethylene film bag stacks which do not require a separate adhesive layer between adjacent bags. The self-opening bag stack according to the invention preferably include a plurality of stacked t-shirt type high density polyethylene film bags releasably adhered together. At least an upper portion of the outer surface of the front and rear walls of each of the bags in the bag stack has been corona treated and at least one localized compressed area extends transversely through the bag stack in the upper portion of the bags such that the stack has a decreased thickness in the localized compressed area and so that adjacent outer wall corona treated surfaces defined by the localized compressed area are releasably adhered together.

Abstract: A sideweld bag making machine utilizing a rotary transfer device and wicket conveyer is equipped with a movable bag stacking guide that is used to align bags as they are stacked on the wicket conveyer. The bag stacking guide, which is mounted on the wicket conveyer, has a first raised position for accumulating bags as they are made, and a second lowered positioned to free stack bags for wicket conveyer indexing. The stacking guide is particularly useful for bags having lengths substantially greater than their width.

Abstract: A system for suspending a pack of thermoplastic bags, loading bags, removing loaded bags and for automatically opening the next bag preparatory to loading it by having a pack of handled bags suspended from laterally spaced elongated rods of a rack. The bags have been corona discharge treated to such an extent that the application of pressure will cause adjacently facing regions to releasably adhere together until a moderate force separates them. During removal of a bag from the bag pack at least a portion of the front wall of the next bag will follow the bag being removed for a short distance before separation thereby opening said next bag rendering it ready for loading. An improved means for applying the requisite pressure is disclosed herein.

Abstract: The invention relates to a method of manufacturing shell-shaped packages, in particular flower sleeves, in which two superposed bands of synthetic material are supplied and machined through die cutting, in such a manner that at least one edge of each package, defining the wide opening, is formed along an ornamental line, whereafter the material bands are cut in transverse direction into separate package portions, the discrete package portions being joined together at the cut edges so as to form the package, wherein, during the die cutting of the longitudinal edges of the material bands, both material bands are perforated through and through in one die cutting operation so as to form suspension portions joined to the package portions via perforated lines extending along an ornamental contour, the suspension portion, formed by the perforation, of one of the two material bands being removed. The invention further relates to an apparatus for carrying out the method, and to the package obtained by the method.

Abstract: A thermoplastic film bag pack where each bag has a bottom, front, rear, and gusseted side walls, an inside and outside surface and a cut-edge mouth portion. The mouth portion has double film loop handles as integral extensions of the walls at its opposite ends. The external surface of the bag at the cut-edge region of the mouth between handles has been subjected to a corona discharge treatment to such an extent that adjacently facing cut-edge regions will be releasably adherent until a moderate force separates them. This condition provides for effective dispensing of grocery bags. A method of forming the bags and a system for dispensing is also disclosed.

Abstract: Packs of T-shirt type plastic shopping bags are fabricated in such a manner that when the bags are mounted on conventional racks, as each bag is pulled off the rack, the front wall of the next ensuing bag is pulled out to open the bag for the depositing of articles to be packed in the bag. This is accomplished by providing a special configuration for the central tab which is hooked on the upwardly extending element in the rack. The tab has a narrow neck which is partially slit between the neck edges and is adhered to the tabs of adjacent bags by an adhesive spot applied in hot melt condition below the slit.

Abstract: An apparatus and method for perforating a plastic film fleader section connecting together a plurality of plastic film bags and forming a pack of saddle bags. The saddle bags are carried on a block with the header on the block and the bags draped thereover. The block is in sliding engagement with a track and is selectively moved in position in the apparatus. A pair of pivotally connected arms are selectively pivotally moved in contact with the plastic film bags pulling the bags generally away from the header and causing the header to become taut. A pair of perforation blades are forced toward the carrying block and through the header simultaneously creating two perforation lines, one line on each side of the header.

Abstract: A sealing and severing apparatus is disclosed for sealing plastic bags formed in succession from stock plastic film material and then severing the sealed bags from one another. The bags are filled with a foamable composition while they are being formed so that when the formed and filled bags are placed in a container, the foamable composition fills the bag with foam to thereby produce a customized foam cushion for any objects in the container.

Abstract: This invention relates to a method and device for manufacturing plastic bags by transversely cutting and sealing a plastic web at spaced locations and, more particularly, to a method and device for operating a stacking device by means of a servo-motor. The servo-motor is coupled to a conveyor on which a plurality of pin stack elements are arranged. The servo-motor is also connected to a servo-controller which directs the operation of the servo-motor and coordinates the movement of the conveyor with the movement of a pair of draw rolls which draw the web through a cutting and sealing bar which forms individual bags. The bags are carried from the area of their formation by means of a wicketer to the pin stack elements on the conveyor. The servo-controller directs the draw rolls to cease drawing the web to prevent waste of bag production so that an arm of the wicketer, which will pass over the conveyor when the conveyor is being moved, does not carry a bag.

Abstract: 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.

Abstract: A method for making bags of synthetic material in which a tubular foil web of synthetic material is advanced in steps corresponding to the length of one bag. A continuously heated pair (11) of welding jaws grips the tubular foil web (3) of synthetic material prior to cutting and fixes the web in position. The tubular foil web (3) is then cut by means of the transverse cutting knife (10) before the heat of the pair (11) of welding jaws is completely transferred to the tubular foil web (3) of synthetic material. Then the heat is completely transferred to weld the bottom seam of the bag.

Abstract: A method and apparatus for producing bags interconnected at their open ends by forming transverse seals across a flattened longitudinal tube of film material and utilizing a cutting die to cut a transverse weakened line across the tube intermediate the transverse seals and to cut a pair of handle openings, one on each side of the transverse weakened line.

Abstract: An interfolded boxed bag arrangement and method and apparatus for making the same from plastic tube or sheeting stock. Plastic tubular or sheeting stock is unwound off two rolls under tension. The stock proceeds to various stations where it is cut into bag lanes by rotary knife blades. A bag lane is cut between each pair of rotary knife blades with a hot knife to form a sealed bottom for the bags. The bag lanes are then cut to a specified length with a hot knife which seals each side of the bag. Bags produced by each roll of stock material are staggered adjacent to one another and are interfolded with each other by a set of rotary gripper fingers and tucker fingers to form an interfolded stack of bags. The stacks are placed into a dispensing box for individual dispensing.

Abstract: An apparatus for transferring stacks of flexible products is disclosed including a flat plate base support structure having a top and bottom; at least a first pair of clamping means releasably attached to the top of the support structure for clamping a first stack of flexible products; and an actuating means releasably attached to said first pair of clamping means; said actuating means adapted for substantially simultaneously actuating the at least first pair of clamping means.

Abstract: An apparatus for the continuous packaging of flexible bags is adapted for use with a continuous bag manufacturing machine. Separate bags are received on a conveyor which conveys the bags to a stacking station at the end of the conveyor. At the stacking station, the bags are stacked in a catch tray until a predetermined number of bags have been collected, at which point the tray is opened to drop the bags into an open container supported on a turntable beneath the catch tray. The turntable is rotatable to convey the open container away from the stacking station to an unloading station when the container has been filled with bags. The turntable rotatably supports a number of support plates evenly distributed around the perimeter of the turntable, upon which an open container sits. A multi-motion actuator situated at the stacking station underneath the turntable is operable to rotate the support plate at the stacking station relative to the turntable.

Abstract: A machine for forming stacks of bags from a web of synthetic thermoplastic material has feeding rollers for feeding the web to welding jaws which form transverse welds in the web. There is a first motor for operating the feeding rollers and a second motor for operating the welding jaws. A central processing unit controls operation of the respective motors and includes a controller for the first motor for operating the first motor for an increased time and at a reduced speed during feeding of a leading bag in a stack as compared with the time and speed of operation of the first motor during feeding of remaining bags in the stack. This facilitates the removal of a previously formed stack of bags from a machine.

Abstract: Downstream of the welding and cutting bars (14, 16), a crosspiece (18) interacts with two pressure elements (20, 34) which act alternately in order to retain the manufactured articles on said crosspiece, engaging in each cycle the new manufactured article to be accumulated; downstream of said welding bars and said crosspiece, a transporter element (60A), endowed with a movement which corresponds to that of the manufactured article under formation, moves with an active trajectory above the stack under formation (PO) and assists it to extend above the stack under formation; said transporter element (60A) removes itself from below said manufactured article when the latter is engaged by the first pressure element (20).

Abstract: In a device for transversely welding and cutting tubular film into bags, feed rolls advance the film to a gripping rail which grips the leading end of the film during operation of cutting and welding devices located behind the gripping rail in the direction of feed. To ensure proper tensioning of the film, the feed rollers are reversed after the film is gripped and prior to operation of the cutting and welding devices.

Abstract: A system for suspending a pack of thermoplastic bags, loading bags, removing loaded bags and for automatically opening the next bag preparatory to loading it by having a pack of handled bags suspended from laterally spaced elongated rods of a rack. The bags have been corona discharge treated in the handle and bag mouth region to such an extent that the pressure and cutting action during the formation thereof will cause adjacently facing cut edge regions to releasably adhere together until a moderate force separates them. During removal of a bag from the bag pack at least a portion of the cut edge of the mouth and handle region of the front wall of the next bag will follow the bag being removed for a short distance before separation thereby opening the next bag rendering it ready for loading.

Abstract: An apparatus is provided for stacking flat articles, such as double bags, which have been severed by hot-wire welding from a continuous tubular or semitubular plastic film and have opening-defining edges adjacent to their center lines. The bags are delivered by a transfer apparatus, called a wicketer. The wicketer has feeding arms, which are secured to a shaft and rotate about a horizontal axis and which are arranged in pairs in a starlike array. The bags are needled adjacent to their longitudinal center line on a holding plate, which is provided in a stacking station and carries upstanding stacking pins or needles, so that stacks are formed. Two radial holding plates are rotatably mounted on the shaft or axle and are connected to separate respective drives for pivotally moving the holding plates to a stacking position for receiving the articles.

Abstract: An apparatus for the production of shopping bags provided with handle holes reinforced by welded-on tabs of thermoplastic synthetic resin film includes a unit for effecting cyclic stepwise advancement of film webs forming sides of each bag; a unit for punching handle holes into the welded-on tabs and devices for welding and severing of the films webs to form individual shopping bags transversely to the direction of the advancement of the film webs, as well as a device for feeding tabs of thermoplastic synthetic resin films to positions on the film webs and for welding the tabs to the film webs. The device for feeding and welding of the tabs comprising a turntable which is rotatable about an axis perpendicular to the advancing direction of the film webs which operates cyclically in synchronism with the stepwise advancement of the film webs.

Abstract: An apparatus and method for making individual flexible web products whereby a web material is tucked outwardly from the surface of a product drum by fixed projections, severed and sealed, and provided to one or more transfer points. The products are there transferred to open or more transfer drums with corresponding indentations, which deliver the products to packing devices. An alternative embodiment provides multiple delivery points by using lateral-shifting transfer drums. The apparatus and method provides a simple means to vary and control flexible product width without introducing a multiplicity of moving parts, and discloses means to enhance separation of individual products during transfer while increasing overall production rates.

Abstract: The invention relates, in particular, to the field of plastic bag treatment.The method consists in releasably connecting brackets 29 for holding together stacks 15 to a stack conveying device 21, stacking the individual bags 11 on the legs 31 of the brackets 29 in a stacking station 14 and then taking off the stacks 15 held together by the brackets 29 in a take-off station 22.The apparatus comprises the stack conveying device 21 to which the brackets 29 are connected by a releasable holding device in such a way that each stack 15 can be taken together with the bracket 29 off the stack conveying device in the take-off station 22. The brackets 29 are fed to the stack conveying device 21 in a bracket delivery station 70 preceding the stacking station 14. The legs 31 of the brackets 29 then serve in the stacking station 14 as wicketing pins on which the individual bags 11 are stacked.

Abstract: A device is provided with vertical holding elements for depositing and stacking of plastic bags having welded lower or bottom seams. The holding elements are fixed to crossbeams which extend across an advancing plane in the feeding direction of the bag and are hinged onto an outer circumference of a rotatable support. The support is in the form of an impeller wheel and the crossbeams are set on the support so that the holding elements maintain a vertical position as the crossbeams rotate.

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 machine for the continuous production of plastic bags utilizes a servo drive motor to drive the machines film web draw roll assembly and through a seal roll index gear also to drive a seal roll of the machine in coordination with the servo driven draw roll. Control of the servo motor is through a motion controller receiving inputs form the servo motor.

Abstract: An easy opening bag pack and supporting rack system is provided which includes a plurality of gussetted bags of the T-shirt type or of the flat top type provided with bag mounting apertures through all of the bag walls on opposed sides thereof and additional cuts in the front wall portion and the front section of the gussetted side wall portions and in communication with the bag mounting apertures therein for effectively enlarging such apertures. A rack mounts the bag pack through the mounting apertures and includes stub shaft supports laterally spaced from each other and being a length less than the outwardly extending dimensions of an open bag and greater than the thickness of the bag pack and include an enlarged portion on the free outer ends thereof of greater dimensions than the bag mounting apertures.

Abstract: According to the invention, a number of sheet materials P1 are successively delivered to and clamped between a plurality of clamp rollers 5. A servo motor 6 is operatively connected to the clamp rollers 5 to rotate the latter. A detector PH1 is disposed upstream of the clamp rollers 5 and detects the position of the sheet material P1. Further, a control device 9 is connected to the servo motor 6 and the detector PH1 to control the servo motor 6 to momentarily decrease its number of revolutions (R.P.M.) in response to the detection signal from the detector PH1 immediately before the sheet material P1 is completely discharged from the clamp rollers 5. The rotative speed of the clamp rollers 5 is therefore momentarily lowered so that the sheet material P1 is discharged at low speed. Accordingly, the sheet material P1 conveniently falls down onto a table 8 so that sheet materials P1 are regularly stacked on the table 8. No backling takes place in the leading end of the sheet material P1.

Abstract: An easy opening bag pack and supporting rack system is provided which includes a plurality of gussetted bags of the T-shirt type or of the flat top type provided with bag mounting apertures through all of the bag walls on opposed sides thereof and additional cuts in the front wall portion and the front section of the gussetted side wall portions and in communication with the bag mounting apertures therein for effectively enlarging such apertures. A rack mounts the bag pack through the mounting apertures and includes stub shaft supports laterally spaced from each other and being of a length less than the outwardly extending dimensions of an open bag and greater than the thickness of the bag pack and include an enlarged portion on the free outer ends thereof of greater dimensions than the bag mounting apertures.