Abstract: A rotatable knife roll with at least one foil knife secured on a portion of the body of the roll and having a sharp and endless cutting edge closed within itself to cut out window openings. There are breakthroughs for suction apertures arranged within the cutting edge. There is at least one suction-air control valve arranged on the face side of the roll body. The valve is rotatable relative to this portion of the roll. The suction-air control valve has at least one suction-air-control channel and at least one fresh-air channel. There are suction apertures for temporarily retaining a letter envelope blank over a suction and transport angle zone &agr;, and for retaining a piece of material cut out by the foil knife across a suction and transport angle zone &bgr;. The suction apertures are arranged in rows to which suction channels are allocated in the part of the roll body.

Abstract: In an apparatus for extracting chips from slots cut into a substrate, a cutter having a cutting implement is mounted thereon and is adapted to cut slots into the substrate. At least one injector is positioned proximate to the cutting implement, and includes a nozzle having a nozzle tip directed at the slots such that during operation a current of gas is directed into the slots to loosen any substrate chips therefrom which were generated during the cutting operation. A vacuum apparatus is positioned proximate to the cutting apparatus for capturing and removing the substrate chips loosened by the injector.

Abstract: A method and apparatus for cutting sheet material allows multiple layups of sheet material to be cut in side-by-side or stacked relationship on the cutting table of a computer controlled cutting machine. A different marker or array of pattern pieces can be cut from each of the stacked layups. Also, for certain layups, whether stacked or not, markers are located with reference to the centerline of the layup to insure that the pattern pieces of the marker are cut symmetrically or in alignment with ornamentation or designs in the material.

Abstract: Apparatus for cutting single or multiple semiconductor packages from a multilayer substrate wherein the semiconductor packages are partially encapsulated by an elastomer sealant layer disposed on a polymer film layer of the substrate. The apparatus includes upper and lower die assemblies mounted for movement relative to each other on a support base. The upper die assembly includes an actuator and a die block supporting plural sets of cutter blades arranged in patterns to cut rectangular shaped semiconductor packages out of the substrate in a single cutting operation at a single station. The lower die assembly includes plural punch members movable relative to a die block, which includes a support surface for supporting the substrate in a predetermined position as determined by spaced apart locator pins on the lower die assembly registerable with corresponding locator holes in a carrier frame for the substrate.

Abstract: In order to process a solid processed object with a simple construction, and to process a solid and flat work while effectively collecting particulate scraps, in a machine tool for processing work in which a working table on which the work is mounted and a spindle in which a cutter is installed move relatively to each other, a bellow which telescopes freely is provided, one open end of which connects to the spindle head so as to surround the spindle, and the other open end of which connects to a working table in such a manner as to surround the work.

Abstract: A table saw or other cutting machine includes carrying members on an underside of the work table generally adjacent the flanged table edge in order to provide an increased gripping surface area to be grasped by the operator when lifting and transporting the cutting machine. The machine is preferably equipped with invertible extension support assemblies for supporting a workpiece extending horizontally beyond the work table. Such support assemblies include support members slidably extendable horizontally on rods toward and away from the work table. A dust deflection skirt extends from a lower surface of the work table into the generally hollow dust-receiving cavity portion of a dust shroud located within the saw's enclosed base. This skirt deflects dust or chips into the interior of the hollow dust-receiving cavity. Anti-kickback spacers are preferably sealed-end blind rivets mounted on the anti-kickback pawls at intermediate locations thereon.

Abstract: An apparatus for cutting an indefinite length suture strand to uniform lengths for subsequent threading and swaging to a surgical needle includes a drawing tower having at least one guide member defining a drawing axis parallel thereto. First and second gripping devices are provided to grip the indefinite length suture strand and draw it along the drawing axis; each gripping device mounted for reciprocal movement on at least one guide member. A retractable cutter for cutting the indefinite length suture strand is also provided for cutting the strand at a start position along the drawing axis. The indefinite length suture strand is fed to the drawing axis and drawn a predetermined distance beyond the location of the retractable cutter for positioning within a suture receiving opening formed in the surgical needle, while the second gripping device reciprocates to a start position along the drawing axis.

Abstract: A universal cutting assembly is provided for cutting a panel from an envelope blank or the like. The die holder can have either a magnetic or non-magnetic outer surface and a plurality of surface orifices therein radially communicating with corresponding feed tubes for individually and selectively supplying vacuum or air to the surface and into the vicinity of the envelope blank. A novel die plate locating system is also provided for use with the universal cutting assembly.

Abstract: A chip and dust collection apparatus attached to a machine tool having a spindle and a cutter for removing chips and dust near the cutter at the time of cutting is disclosed. The invention comprises a vacuum supply apparatus and a hollow vacuum hood rotatably attached to the machine tool around the spindle so that the cutter projects forwardly through the vacuum hood. A hose connecting, the vacuum supply apparatus to the vacuum hood is also provided. A flexible sleeve is attached the vacuum hood so that the cutter projects through the flexible sleeve. The flexible sleeve is more flexible along the longitudinal sleeve axis than normal to the longitudinal sleeve axis. The flexible sleeve is also pivotable at one end to a plurality of orientations not parallel with the longitudinal sleeve axis. Further, a hollow foot is attached to the flexible sleeve. A sealing end of the foot has a flange extending outwardly and back toward the machine tool.

Abstract: A magnetic cutting assembly and waste removal system is provided for cutting a panel from an envelope blank or the like. The die holder has a magnetic outer surface and a plurality of surface orifices therein radially communicating with corresponding feed tubes for supplying vacuum or air to the surface and into the vicinity of the envelope blank. In order to maximize the number of orifices while minimizing the number of magnetic members, the magnetic members are disposed in a plurality of rows wherein each row contains alternating magnets and orifices and a row of orifices are disposed between each adjacent row of magnets, and the orifices are connected to corresponding feed tubes in a matrix.

Abstract: A dust collector assembly for a toolhead assembly of a machine tool, having a base unit, a bracket supported on the base unit and pivotal relative thereto about a first axis and a tool unit supported on the bracket and pivotal relative thereto about a second axis, generally consisting of a first duct member supported on the base unit, having an inlet and an outlet communicable with a vacuum producing source; a second duct member supported on the bracket, having an inlet and an outlet communicating with the inlet of the first duct member through a first slip ring connection disposed coaxially with the first axis; and third duct supported on the bracket, having an inlet disposed adjacent a tool of the tool unit and an outlet communicating with the inlet of the second duct through a second slip ring connection disposed coaxially with the second axis.

Abstract: In order to manage with a lower suction capacity of the sawdust fan in the case of a vertical board saw with a sawing unit movable horizontally and vertically, a support grid receiving a workpiece, being arranged essentially vertically and displaceable in the vertical direction, this grid comprising a plurality of support bars arranged horizontally and in parallel spaced relation to one another as well as suction channels arranged at right angles hereto and opening towards the workpiece, and a device for collecting the sawdust resulting on the side of the support grid during horizontal cutting, it is suggested that the support bars be designed as essentially closed channels each with a slot-shaped opening extending essentially along the entire length of the support bar, an edge of the saw blade of the sawing unit being able to enter this opening essentially without making contact during the horizontal cutting, and that the support bar channels be connected to a sawdust collecting means, wherein the support ba

Abstract: Rotary knife apparatus used in connection with a pouch form, fill and seal machine capable of handling a substantially wide range of pouch sizes or variations in pouch fills. The apparatus includes major and minor knife hubs cantilevered on respective shafts and driven by a continuous backwrapped chain or timing belt. Rigid knife blades are mounted to interchangeable knife blocks on the major knife hub having varying radial dimensions to accommodate varying pouch chordal distances. The minor knife hub is laterally adjustable relative to the major knife hub along a fixed path to accommodate the substantial changeover.

Abstract: An apparatus for cutting a web with a rotary cutter 31 includes a cutter drum 42, which has an air suction chamber 58 and air discharge chambers 59A and 59B, these chambers being formed in its inside, as well as having first air jet holes 71, second air jet holes 72, and third air jet holes 73, these air jet holes 71 to 73 being open in its outer periphery.

Abstract: A slider of the punch carry out unit is moved in the X-axis direction adjacent a punching section of the punch press machine before or after a plate material is punched into a punched product by a punch press machine. At the same time, a gravity center and a shape of the punched product are calculated and recognized on the basis of the manufacturing data. On the basis of the obtained gravity center and the shape of the punched product, the gravity center of the punched product is moved under the lift arm by the X- and Y-axis locating mechanism. Vacuum pads located just over the punched product are selected or discriminated. Then, the lift arm is lowered and the punched product is held by actuating only the discriminated vacuum pads. During this lift motion, it is preferable to bend one end of the punched product slightly upward to easily separate the punched product from the remaining flat plate material.

Abstract: A shaving or shearing blade utilized in dressing solder joint chip technologies without the use of heat or a copper block wicking process. In essence, any solder debris resulting from the solder shaving process as implemented by the shaving blade is removed through the intermediary of a vacuum arrangement located as an integral structure in the shaving blade so as to inhibit the potential formation of electrical shorts or causing solder damage in subsequent replacement chip joins or other assembly operations.

Abstract: A hole cutter adapted for cutting holes through the sidewalls of medical catheters is fashioned from a hollow tube having a distal cutting end, a proximal ejection end and a lumen of smaller diameter near the cutting end. Slugs formed at the cutting end are extracted by suction applied to the ejection end, and are captured by a filter.

Abstract: An apparatus for trimming the edges of a fabric panel. The apparatus includes a holding fixture for holding the panel such that the edges to be trimmed hang freely in the holding fixture. A trimming apparatus is insertable into the holding fixture for trimming the edges of the panels together while the panels are held in the holding fixture. The trimming apparatus includes a frame having a movable slide and at least one trimming assembly attached to the slide. A fixture drive engages the holding fixture holding the edges of the panels to be trimmed and repositions the holding fixture prior to trimming the edges of the panel.

Abstract: A machine for cutting electric battery plates, comprising two rollers (17, 18), between which a metal strip (20) passes. The metal strip is provided with a row of holes (22) running down the center, separated by bridges (31). The lower roller (17) is provided with means for removing cut-away pieces. A disk that is selectively circumferentially positioned is mounted on the lower roller. Lugs (21) project radially from the disk to pull the strip (20) along. Cutter plates (25, 26) are mounted on the upper roller. The cutter plates are provided with blades (29, 30) that cut the strip (20) and the bridges (31) transversely to yield plates (32) with their respective tabs (33). Inserts (35, 36) are provided under the cutter plates.

Abstract: A magnetic cutting assembly and waste removal system is provided for cutting a panel from an envelope blank or the like. The die holder has a magnetic outer surface and a plurality of surface orifice therein radially communicating with corresponding feed tubes for supplying vacuum or air to the surface and into the vicinity of the envelope blank. In order to maximize the number of orifices while minimizing the number of magnetic members, the magnetic members be disposed in a plurality of rows wherein each row contains alternating magnets and orifices and a row of orifices are disposed between each adjacent row of magnets.

Abstract: An apparatus for forming an integral three-dimensional object from a plurality of individual laminations includes a cutting surface on which each of the laminations is individually deposited. A concentrated energy source cuts each of the plurality of laminations into a shape required for assembly of the laminations into the integral three-dimensional object. A transfer mechanism removes each of the cut laminations from the cutting surface and stacks each of the cut laminations on an assembly surface. The transfer mechanism includes a gripper face having a peripheral portion and a central portion. A mask is positioned on the gripper face. The mask has an apertured central portion corresponding to the cut lamination. A source of suction communicates with the gripper face and a valve mechanism selectively draws a suction on the gripper face peripheral portion, the gripper face central portion, both or neither.

Abstract: A bandsaw for cutting off slices from a workpiece includes a sawband which circulates over a system of pulleys and has a band back and a cutting edge, which is situated opposite to the band back and is provided with a cutting surface. There is also a feed system, which effects a relative movement between the workpiece and the cutting edge, so that the sawband penetrates into the workpiece, thus forming a cutting gap. The bandsaw has a support plate, which supports the band back and is held by a holding device. There is also a process for cutting off slices from a workpiece using this bandsaw. A part of the support plate, which part adjoins the band back, also penetrates into the cutting gap during the cutting of the workpiece.

Abstract: A punched slug removal system for punching a slug from a workpiece and removing the punched slug. The system includes a punch having a reciprocating travel path with a transition point where the punch changes direction. A die plate has an aperture into which a die bushing may be disposed. The die bushing provides support for the workpiece and has an opening through which the punch and a slug pass. A manifold supports the die plate and (if present) the die bushing and has a distribution channel and an orifice which direct a gas flow onto a slug attached to the punch in a direction perpendicular to the reciprocating travel path of the punch to remove the slug from the punch. The distribution channel is tapered to increase the velocity of the gas flow. The orifice is positioned at the top of the manifold adjacent the transition point of the reciprocating travel path of the punch.

Abstract: The combination of a table and a table-type microtome has a base having an internal volume and a linear guide. A seating device is movably mounted on the base. The seating device is movable along the linear guide. A drive causes movement of the seating device relative to the base along the linear guide for height adjustment. A table-type microtome is arranged on the seating device. At least one appliance for the table-type microtome is arranged in the internal volume of the base and is operatingly connected to the table-type microtome.

Abstract: A rapping device is provided for forming a battery separator or the like by rapping from a flexible elastic band material. A rapping device for manufacturing works in a specified shape by rapping from an elastic band material comprises a conveying drum having a first suction unit and a second suction unit for conveying the band material while suction is applied, a die drum having a blade possessing a forming position for rapping and forming the works with a width coinciding with the width of the band material, and a cutting position for cutting between the adjacent works, disposed continuously on the outer circumference at every pitch equal to the length of each work, and a die drum driving device for rotating and driving the die drum in synchronization with the conveying speed of the band material.

Abstract: A continuous strip of sheet paper material is divided into blanks by a device comprising a cutter and an anvil rendered capable of sliding movement one in relation to the other and establishing a cutting position toward which the strip is advanced by way of a passage incorporated into the anvil; the cutter is reciprocated across the anvil in such a manner as to pass through the cutting position transversely to the strip, alternating between two limit positions on opposite sides of the passage, the geometry being such that the cutter will vacate the passage entirely when occupying either one of the two limit positions.

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 fixed torpedo mounted in the center of a funnel assembly for a dust collector removes residue caused by a machining practice applied to a work piece, with enhanced flow characteristics due to the fixed torpedo of a dual cone shape fixedly secured in the funnel.

Abstract: A dust collection nozzle (12) is provided through the upper blade guard 7 of a circular saw (1). The dust collection nozzle (12) includes a flared, horn-shaped dust capturing section (13) having a rectangular opening at the front end thereof, and a cylindrical dust outlet tube (14) connected to the rear end of the dust capturing section (13). Throughout cutting operations, the opening (16) remains directed toward the lower portion of the saw blade (8) so as to collect dust and other debris generated from a saw blade (8) rotatable attached to the upper blade guard. The dust collection nozzle (12) also includes a pair of dust guide plates (17, 18) formed on and extended from the opening (16). The dust guide plates (17, 18) extend in parallel to each other so as to interpose the saw blade (8) therebetween. Furthermore, provided to the right of the dust guide plate (18) is a flow straightening plate (19) extending in parallel to plates (17) and (18) from the upper to lower edges of the opening (16).

Abstract: A bench circular saw machine for cutting a material including a base upon which the material is supported, an arm interconnected to the base, a tube member, and a main body having a circular saw for cutting the material and a motor operatively associated with the circular saw for driving the circular saw. The main body is pivotally supported on the arm such that the main body can be pivoted toward the base and the circular saw can cut the material. The main body has a discharge port through which sawdust formed by the circular saw during a cutting operation is discharged from the main body. The tube member is disposed adjacent to the discharge port and is associated with the discharge port so as to guide the sawdust into the discharge port. The tube member is also pivotable relative to the material such that an angle of the tube member relative to the material can be varied.

Abstract: An apparatus for cutting a web with a rotary cutter 31 includes a cutter drum 42, which has an air suction chamber 58 and air discharge chambers 59A and 59B, these chambers being formed in its inside, as well is having first air jet holes 71, second air jet holes 72, and third air jet holes 73, these air jet holes 71 to 73 being open in its outer periphery.

Abstract: A method and apparatus for removing skivings generated by slicing a moving web comprises a slitter knife for cutting the web and an edge vacuum machine comprising at least two vacuum heads which engulf but do not touch the moving web. Skivings from the edges of the web are vacuumed away so that they do not contaminate the web during later treatment.

Abstract: A punch tool for punching a slug from a workpiece. The punch of the punch tool has a reciprocating travel path with a transition region where the punch changes direction. A die plate of the punch tool has an aperture. A support bushing disposed in the aperture of the die plate provides support for the workpiece and has an underside and an opening through which the punch and the slug pass. A nozzle disposed in the aperture of the die plate provides an internal passage for the removal of punch slugs from the tool. The nozzle has a top and a side wall with a hole disposed in the side wall adjacent the transition region of the reciprocating travel path of the punch. The nozzle, the support bushing, and the die plate are integrated to form a flow path delivering a gas flow to the hole in the nozzle. The flow path and the hole direct the gas flow on a slug attached to the punch in the transition region of the reciprocating travel path of the punch to remove the slug from the punch.

Abstract: A method and apparatus for cutting sheet material upon an apertured support surface, the apparatus including a pair of spaced apart parallel cutters. The cutters are spaced apart by a distance greater than a dimension of the apertures, but less than an inter aperture distance so that at least one of the cutters remains in cutting contact with the support surface when the remaining cutter passes over an aperture. The method includes selectively overcutting and undercutting the line segments at an intersection to ensure continuity of cut paths of both cutters.

Abstract: A method for forming a plurality of holes, creating profiles, in a plurality of vinyl layers using a hollow portion of an RF sealing die and for removing the profiles from the die using a base plate punch and a removal means.

Abstract: A trimming processing device automatically processes trimmings generated when a running wide web is slit in the running direction of the web into a plurality of strips having desired widths. A trimming cutting unit movable in the transverse direction of the web cuts the trimmings in the transverse direction of the trimmings, and a trimming conveyor unit movable in the transverse direction of the web conveys the trimmings away from the web. The positions of the trimming cutting unit and the trimming conveyor unit are controlled according to the position of the trimmings which varies according to the width of the web and the width and the number of the strips to be slit from the web.

Abstract: A system is provided for forming a continuous mineral fiber wool tow and cutting the tow into discrete lengths. The system comprises a conveying apparatus for pulling a mineral fiber wool tow from a mineral fiber pack at a first location and transporting the tow to a chopping station. A chopping apparatus is positioned at the chopping station for chopping the tow into discrete lengths. The conveying apparatus further receives the discrete lengths at the chopping station and transports the discrete lengths to a collecting station. The conveying apparatus further includes a collection device located at the collecting station for receiving the discrete lengths of mineral fiber wool material and collecting the discrete lengths for subsequent use.

Abstract: A web (W) of sheet material intended to form individual tagged packets has surplus portions of a thread (S) extending along its length removed while the web is being advanced. After severing one end of each unwanted thread portion with a rotary cutter (2), the severed end is lifted by a wiper (10), and the lifted end is held away from the web by suction means (20) while it is detached by shearing means (22). The suction means (20) then remove the detached thread portion.

Abstract: A vacuum attachment assembly for a scroll saw wherein the scroll saw includes a base, a table, a table bevel lock knob, a table bevel plate, an upper arm and a lower arm-blade. The vacuum attachment includes a bracket having first and second ends. The first end of the bracket has an opening for receiving the table bevel lock knob. The second end of the bracket has an opening of predetermined size and is oriented so that the opening is located under the scroll saw table near the lower arm-blade assembly. The vacuum attachment assembly also includes an elbow that is connected to the opening of the second end of the bracket. A hose is connected to the elbow and oriented to collect and divert saw dust away from the table of the scroll saw.

Abstract: A method and apparatus is provided for dimensioning and manipulating a patterned material by selectively applying a vacuum and/or positive pressure to the patterned material.

Abstract: Apparatus for processing chopped fibers from essentially continuous tows, each consisting of individual strands, comprises independently or selectively feeding at least two tows to a venturi pump and associated cutter mechanism where the tows are cut or chopped into relatively short lengths to form chopped fibers. The apparatus includes sensors for monitoring the movement of each of the tows to the pump and cutter mechanism, and a controller which adjusts the feed rate of the tows and the rate of operation of the cutter mechanism in the event movement of one of the tows varies from a predetermined feed rate.

Abstract: A rotary knife apparatus for depositing filled pouches in preselected count stacks along a travelling product conveyor. The rotary knife apparatus includes a rotating disc valve intermediate negative and positive pressure sources on one side and a rotary knife hub on the other side. The rotating disc valve includes a plurality of arcuate slots and apertures which communicate with the negative and positive pressure sources and axial ports in the knife hub such that the knife hub holds and expels the filled pouches along defined segments of rotation of the knife hub. The rotating disc valve has a dynamically variable rotational speed relative to a rotational speed of the knife hub for changing a predetermined number of different angular drop-off points during a period of rotation of the knife hub to correspondingly change the preselected count of pouches in a stack.

Abstract: A continuous strand of wire is laid in a wire groove or between pairs of guides on a substrate and is cut at desired locations to form individual circuits. At least one recess below the level of the wire laying plane is positioned to correspond to a scrap wire portion to be cut off. The recess is wide enough to allow insertion of cutters. The cutters include pairs of first and second cutting blades located at opposite sides of the wire which are moved toward the wire so that both ends of the scrap wire portion are cut by the first cutting blades and by the second cutting blades, respectively.

Abstract: The invention relates to an installation for automatically cutting sheet material, the installation comprising at least one cutting device and at least one device for stacking sheets for cutting. The cutting device comprises a bench, and a cutting head mounted on displacement means. From its feed end to its unloading end, the bench has a cutting zone beneath which a suction cutting conveyor is mounted together with an unloading conveyor. Turbine means for creating suction are disposed beneath the unloading conveyor, and the cutting head is mounted on the face of the displacement means that face toward the feed end of the bench.

Abstract: A dust or chip collection and diversion system is provided for a device having a cutting tool for performing a working operation on a workpiece. The position and orientation of the dust-receiving or dust-collecting opening remains constant with respect to the cutting tool regardless of the position or configuration of the device, the device having a movable blade or other cutting tool, thus greatly enhancing the dust collection effectiveness in any of a number of operational configurations. Such position and orientation of the dust-receiving opening is also independent of the movement or position of any adjustable or movable guard or workpiece-supporting fence.

Abstract: Knives (28, 30, 122) are held in tangential, resilient (106, 108) or fixed (132, 136) contact with a surface of an air bar (12-20) or air table (142); so that a web (26) moving on a cushion of air (46) over the air bar or table is cleanly slit into webs (32, 34, 36) of smaller width.

Abstract: A cutting device for trimming printed paper packages in a packaging machine. A cutting unit includes an upper part and a lower part which are movable relative to each other when a paper package passes between them. The package originates from paper material on a reel and is formed into a flat tube with glued edges with an unprinted neutral strip. One of the parts of the cutting unit carries two blades spaced apart by a distance equal to the width of the neutral strip and interacts with two counter blades on the other part. An elastic presser is positioned on one of the parts of the cutting unit to hold the package while the neutral strip is being cut by the blades. Spacers are provided so that the distance between the blades can be varied to match the width of the neutral strip.

Abstract: A method and apparatus is provided for dimensioning and manipulating a patterned material by selectively applying a vacuum and/or positive pressure to the patterned material.

Abstract: An improved flexible die and cylinder for mounting such die. The flexible die consists of a substantially planar, flexible, sheet of metal which has been etched to form a cutting edge. The ends of the die include a plurality of spaced holes for mounting the die to the cylinder. A pair of depressions in the exterior of the cylinder mount lock bars. The lock bars include a plurality of pins which engage the holes in the die. The cylinder includes a support segment and a transport segment. Air passages in the cylinder open onto an angularly extending selector groove at each end of the cylinder. A selector collar is mounted at each end of the cylinder and includes an air passage therethrough which will mate at one end with the selector groove, and at the other end with one of a series of discrete air channels extending longitudinally through the support segment. These channels in turn communicate with associated rows of the apertures.

Abstract: A process and a device for severing wrappings (11) in each case surrounding a stack (10) of blanks and for removing the wrappings (11).To guarantee that they are held together better, stacks (10) of blanks are surrounded by a strip-shaped wrapping (11). In the region of a wrappings station (19), these are severed by a horizontally movable knife (23). The knife (23) enters into the upper area of an upright limb (12) of the wrapping (11), between upper blanks of the stack (10) of blanks, and is moved along a guide rail (25) whilst severing the wrapping (11). The latter is subsequently drawn away downward by a drawing force.