Abstract: In an upper tool, a stripper plate (35) is disposed movably up and down at a lower end portion (13a) of a punch guide (13) for housing a punch (27) also movably up and down, via a shock damping member (33). Further, the shock damping member (33) is formed into an annular body disposed so as to enclose an annular gap (X) formed between the lower end portion (13a) of the punch guide (13) and the upper surface (65) of the stripper plate (35). The upper tool can reduce noise sound generated during punching processing, and further prevent chips produced during punching processing from adhering onto the workpiece and the shock damping member, thus protecting the workpiece from being scratched by the chips and further improving the life time of the shock damping member.

Abstract: An apparatus (10) for cutting multiple strands of material such as radar reflective chaff comprises at least one movable knife blade (36) with a series of ejector pins (26) which lightly contact the material surface during cutting and a stripper plate (40) which is pressed against the material surface for holding the material during cutting. During cutting, the ejector pins (26) and stripper plate (40) are moved into contact with the material, the blade or blades (36) then cut through the material and the pins (26) and plate (40) are retained in contact with the cut material whilst the or each blade is withdrawn from the cut material.

Abstract: A punching die includes a punch body and a punch head provided for an upper portion of the punch body. The punch head is struck by a striker. The punching die further includes a punch guide disposed at a lower portion of the punch body, a retainer collar disposed over the punch guide and fitted to the punch body, a stripping spring interposed between the punch head and the retainer collar, and an elastically deformable damping member being interposed between an upper surface of the punch guide and a lower surface of the retainer collar.

Abstract: A punching die includes a punch body, a punch driver secured to the punch body, and a punch head provided on an upper portion of the punch driver for movement relative to the punch driver when the punch head is struck by a striker. The punch die further includes a punch guide fitted into the punch body, a stripper plate disposed at a lower portion of the punch guide, a stripping spring interposed between the punch guide and a flange portion of the punch driver, and an elastically deformable damping member interposed between an upper surface of the punch driver and a lower surface of the punch head.

Abstract: In an upper tool, a stripper plate (35) is disposed movably up and down at a lower end portion (13a) of a punch guide (13) for housing a punch (27) also movably up and down, via a shock damping member (33). Further, the shock damping member (33) is formed into an annular body disposed so as to enclose an annular gap (X) formed between the lower end portion (13a) of the punch guide (13) and the upper surface (65) of the stripper plate (35). The upper tool can reduce noise sound generated during punching processing, and further prevent chips produced during punching processing from adhering onto the workpiece and the shock damping member, thus protecting the workpiece from being scratched by the chips and further improving the life time of the shock damping member.

Abstract: In a multiple tool for a punch press, a plurality of punches (57) are arranged circularly so as to be movable up and down within a stripper guide (41) provided also movably up and down in an upper die holding member (15) of the punch press; a punch driver (77) is disposed so as to be rotatable and movable up and down in a central hole (75) within the stripper guide (41); and a projecting portion (97) is formed in the punch driver (77), for striking any one of a plurality of the punches. Further, an indexing device is mounted to rotate the punch driver (77) so that the projecting portion (97) can be indexed over any required punch (57A), for instance. Since only one required punch of a plurality of the punches can be struck without moving the striker, the multiple tool is simple in structure, high in precision, and low in cost.

Abstract: An apparatus for feeding separator sheets (20) to a stack is disclosed. Separator sheets (20) made of paper or another material are disposed between carton layers (19) of a pallet (13) loaded with cartons (10). The separator sheets are produced by a separate separator sheet unit (25) by way of being severed from a web of material (21 ) and are placed onto the carton layers (19). The separator sheet unit (25) operates independently of a palletizer (12) for the cartons (10). The separator sheet unit (25) is comprised of a web conveyor (29) for transporting the web of material (21) in portions, and a blank conveyor (30) for receiving and transporting the separator sheets ( 20) and placing them on the carton layers (19). Additionally, a cutting unit (37) for severing a blank (23) is provided.

Abstract: A punch guide sleeve and stripper plate assembly useable with a punch set of the type having a punch disposed within the punch guide sleeve and adapted to be reciprocally advanced through an opening of the stripper plate attached to one end of the punch guide sleeve by the ram of a punch press. The stripper plate assembly includes a rotatable stripper plate cap which may be manually rotated with respect to the guide sleeve end from a locked to an unlocked position to secure and release the stripper plate through tightening and loosening a retaining wire onto and away from the stripper plate. The retaining wire is preferably substantially circular in cross-section and split to provide two unconnected ends that are attached to the stripper plate cap and the guide sleeve. When these two ends are drawn together in the locked position, the arcuate wire will be diametrally compressed for engagement with the stripper plate.

Abstract: A device for selectively securing a stripper assembly on a punch guide assembly. A resiliently biased plunger is disposed adjacent the guide assembly, and selectively maintains the stripper assembly in a predetermined rotational position relative to the guide assembly. The stripper assembly includes at least one retaining projection, and the guide assembly includes at least one flange for selective engagement with the retaining projection to secure the stripper assembly and the guide assembly against relative axial movement. A method is disclosed including the steps of placing the stripper assembly on the guide assembly, and affecting relative movement between the stripper assembly and the guide assembly to cause the retaining projection to engage the flange, and the plunger to be received in a locator slot on the stripper assembly.

Abstract: A cutter apparatus having a fixed blade in an opening of a paper feeding guide; and a movable blade having a cutting portion which enters into the opening. A paper holding plate is provided on the movable blade slidably in the cutting direction. The distal end of the paper holding plate is kept projected by a sliding mechanism in the cutting direction from the distal end of the cutting portion of the movable blade. With the paper holding plate firmly holding the paper against the feeding guide, the sliding mechanism further moves the movable blade into the opening. On carrying out the cutting operation, firstly the paper holding plate slidingly reaches the recording paper and tightly keeps the paper stationary. Thereafter the cutting portion of the movable blade moves forward enters into the opening to cut the paper. The result is that the recording paper does not escape when undergoing the cutting operation, the cutting quality can be kept excellent to a certain extent irrespective e.g.

Abstract: The invention provides a punch press and shearing tool which operate to provide a series of cuts linked end-to-end for severing a work piece such as a piece of sheet metal. The shearing tool includes first and second elongated, cooperating cutting blades. Each of the blades has a pair of slidably related faces that slide against one another in a plane of reciprocation. The cutting edges are oriented at a small angle, e.g. 2.degree. to 6.degree., relative to one another to sever a piece of sheet stock progressively along a line with a scissor action. An intermittent work piece advancing motor shifts the work piece toward the cutting blades and parallel to the cut when the blades are apart. Gripping members can be yieldably mounted adjacent the cutting blades to grasp and forcefully hold the work piece in place as one blade moves toward the other. Yieldable stripper members on opposite sides of the second blade engage and independently deal with the stock on opposite sides of the cut.

Abstract: An apparatus for cutting and splicing sheets of wood veneer includes two pairs of dies is in opposed cooperating relationship with spacing between the pairs of dies sufficient to receive at least two sheets of wood veneer in an overlapping relation therebetween. In each pair of dies, one die in opposed cooperating relationship with the other die, and one die in each pair is transversely moveable, serving as a holding die, and the other die in each pair is stationary in relation thereto and serves as a cutting die. Means are also provided to move the dies so that upon movement of the dies the overlapping sheets of material are cut and spliced in one operation.

Abstract: A punch holder is described having a stripper arrangement composed of an annular array of nested coil springs housed within a series of aligned facing bores in a punch holder tang and punch holder body to generate a high stripping force in a compact space. A threaded removal ring is employed to force a press fitted stripper cap off the end of the punch holder body. A support ring can be employed to support the stripping cap for small sized punches, or a metal reinforcement molded into the stripper cap.

Abstract: A three-piece, die punch has an upper body fixed in the die, a changeable quill, and a lower body to hold the changeable quill in the die punch.

Abstract: A punch assembly for use in a punch press including a pair of elongated rods having mating respective male and female threaded ends, a head on one end of the female portion for being engaged by a ram of the press, a compression spring, a punch tip at the end of the male portion for action with a workpiece, a punch guide encompassing part of the punch assembly to act as a stripper in relation between the punch tip and the workpiece and a wire clip co-acting between the male and female threaded portions for adjustment of the overall punch length. After sharpening, the wire clip is disengaged and the male and female rods are axially rotated in oposite directions to compensate for the ground-off length. The wire clip is then reengaged and the punch assembly is reassembled for use.

Abstract: A device for selectively securing a stripper plate on a punch guide assembly. The device includes an annular retaining ring adapted to retain the stripper plate on the guide assembly. A resiliently biased plunger is disposed adjacent the guide assembly, and selectively maintains the retaining ring in a predetermined rotational position relative to the guide assembly. The retaining ring includes at least one retaining surface, and the guide assembly includes at least one flange for selective engagement with the retaining surface to secure the retaining ring and guide assembly against relative axial movement. A method is disclosed including the steps of placing the stripper plate on the guide assembly, placing the retaining ring on the stripper plate, and affecting relative movement between the retaining ring and the guide assembly to cause the retaining projection to engage the flange, and the plunger to be received in a locator slot on the retaining ring.

Abstract: In accordance with the present invention, a punching assembly is provided which includes a punch slidably mounted in a housing. An air chamber is located between the punch and the housing for air cooling the punch, with means associated between the housing and the punch for automatically transferring air into the chamber in response to the reciprocation of the punch in the housing. The punch has a flange with a sliding fit in the housing to define a piston for changing the volume of the air chamber. In accordance with another feature of the invention, the stripper plate is removable and is automatically locked in place when inserted, i.e., it is self-locking.

Abstract: In accordance with the present invention, a punching assembly is provided. The punch assembly preferably includes a casing or sleeve in which a punch is mounted for longitudinal sliding movement. In accordance with one feature of the invention, a stripper plate is provided adjacent the operating end of the punch. The stripper plate includes a central opening for the punch that surrounds and guides its cutting end. A retaining means is preferably provided to cover a portion of the stripper plate at times to keep the stripper within the assembly until it is to be released.

Abstract: A punch assembly is described for a punch press having a quick tool change capability. The punch assembly comprises a punch sleeve having a punch slidably mounted therein. A tang extends from the sleeve, and a bolt is connected between the tang and the punch. An ejection spring member is mounted between the tang and the bolt for yieldably biasing the bolt in the direction of the punch. An elastic retraction member is mounted in the sleeve for biasing the punch and tang toward one end of the sleeve. Means is provided for retaining the ejection spring and bolt within the punch assembly during partial disassembly thereof so that only the punch is removed during said partial disassembly while the ejection spring and bolt remain in place when the punch is withdrawn after the bolt is unscrewed from the punch. A screw-threaded punch length adjustment platen is threadedly connected between the tang and the punch for adjusting the distance that the punch extends from the punch assembly.

Abstract: An inspection station punch block apparatus for removing a portion of an integrated circuit die lead from a lead frame. The missing lead is used to mark a defective die and is lataer monitored by a scanning means which causes rejection of the die from the lead frame. A method of carrying out this operation is also disclosed.

Abstract: A punch for a punch press includes a punch holder which is installed on a punch installing portion of the punch press and a plurality of punch bodies so supported on the punch holder as to be independently movable in the vertical direction. Shearing blade portions are formed on the lower ends of the respective punch bodies. The shearing blade portions have elongated configurations, each extending in a different direction in the horizontal plane.

Abstract: A quick change tool holder for a punch press having a die holder, a die base secured to the puch press and a releasable holding device which is manually actuatable to secure and release the die holder to and from the die base without the use of any tools. The die holder is secured to the die base horizontally, vertically and rotationally by an interengagement between the parts. Preferably the releasable holding device includes a spring biased plunger carried on the die holder which has a portion normally biased into engagement with the die base.

Abstract: A cutter for punching a sheet of material having a fixed block disposed so as to face one side of the sheet, a punching blade disposed at the opposite side of the sheet relative to the fixed block, a cutting blade disposed spacedly and along the punching blade, and a transporting roller disposed inside the moving blade. A punched-out portion punched by the punching blade is thereby transported with and separated from a punched-remaining portion cut by the cutting blade.

Abstract: The invention involves a novel structure used in piercing a metal workpiece. Other workpieces made from materials other than metal may be used, if desired. The structure uses a punch plate having movably connected below it a stripper plate. A spring means connects these two plates so that they are movable toward each other. The stripper plate has an aperture centrally located therein and a tubular punch guide fitted over the aperture. A punch housing containing a punch is telescopically fitted within said tubular punch guide and will travel through the length of the punch guide and will travel through the length of the punch guide, through the aperture and puncture a workpiece held below. The tubular punch guide prevents side to side movement of the punch and punch housing to substantialy minimize damage to the punch and supporting structures.

Abstract: A method and apparatus for manufacturing preform panels having at least one preform for repairing interconnects, particularly for repairing meander-like interconnects with a preform plated with hard solder. The metal has at least the steps of: providing at least two successive punch events with a die; and performing a predetermined feed (V) between a metal band and the die between the two punch events, whereby the length of the feed (V) is greater than a die width of the die, a length of the die being shorter than a width of the metal band, and the preform being formed by a residual web of the metal band after the two successive punch events.

Abstract: A multitool punch holder is disclosed in which a tool carrier (22) holds a circumferential array of punches (76) in a corresponding series of bores. Each punch (76) is attached to a stem rod (50) having an upper end protruding above the tool carrier (22). The tool carrier (22) is rotated by an index drive (102, 104, 106, 108) so as to bring a selected one of the stem rods (50) beneath a ram drive features (100) protruding radially outward to lie above the stem rod ends (52). The tool carrier (22) is coupled to the ram (14) by a head member (20) which is telescopically received therein allowing the ram (14) to continue its descent after contact of the tool carrier (22) with the workpiece, the ram (14) having a feature (100) engaging a selected stem rod end (52) lying beneath the ram drive feature (100) to cause advance of the attached punch (76) against the resistance of an encircling stripper spring (62).

Abstract: A punch holder (10) including a punch holder member (20) with a stripper arrangement including a sleeve (36) axially movable with repsect to the holder member (20) each of the holder members (20) and sleeve (36) fit end to end within a bore (79) in an outer member (78), and stripper spring (38) interposed between the holder member (20) and sleeve (56) combined with a resilient cup piece (58) fit to the end of the sleeve (36) enclosing the lower end face (56) of the sleeve (36).

Abstract: A punch stripper is formed with an axially aligned aperture extending therethrough so that the punch stripper can be installed on the shaft of a punch. The punch stripper includes a cylindrical housing with a plunger telescoped within an axially aligned bore. An array of spring elements are axially aligned within the cylindrical housing such that a biasing force is exerted on one end of the plunger. A cap is held in position by a snap ring at the end of the housing most remote from the plunger. The array of spring elements exert a biasing force on the cap. An elastomeric O-ring is positioned within the cap so that a frictional force can be developed between the punch stripper and a punch that passes therethrough.

Abstract: A punch assembly for a punch press is described which includes an external housing or sleeve having a punch slidably mounted therein with a spring such as a disc spring for yieldably biasing the punch toward one end of the sleeve and a removable stripper plate mounted on the sleeve in a position around the operating end of the punch. The punch is preferably keyed to the sleeve in more than one location and the stripper plate guides the punch by preventing rotation as well as lateral deflection. A retaining member such as a ring surrounds the stripper plate and can be manipulated manually, e.g. by rotating it, to enable the punch and stripper plate to be ejected by means of a spring.

Abstract: A punch and die system is disclosed as comprising punch and die templets serving to positionally locate punch and die assemblies relative thereto solely adjacent the region at which punching of a workpiece occurs in combination with guide assemblies for positionally locating the punch and die templets one to the other. The punch and die assemblies are designed to utilize interchangeable punch guide and die members and in a preferred construction a punch element is removably attached to its associated driver and shaped to permit opposite ends thereof to be employed in the punching operation. One or more punch elements may be loosely attached to their associated drivers.

Abstract: A punch and die system is disclosed as comprising punch and die templets serving to positionally locate punch and die assemblies relative thereto solely adjacent the region at which punching of a workpiece occurs in combination with guide assemblies for positionally locating the punch and die templets one to the other. The punch and die assemblies are designed to utilize interchangeable punch guide and die members and in a preferred construction a punch element is removably attached to its associated driver and shaped to permit opposite ends thereof to be employed in the punching operation. One or more punch elements may be loosely attached to their associated drivers.

Abstract: A punch and die system is disclosed as comprising punch and die templets serving to positionally locate punch and die assemblies relative thereto solely adjacent the region at which punching of a workpiece occurs in combination with guide assemblies for positionally locating the punch and die templets one to the other. The punch and die assemblies are designed to utilize interchangeable punch guide and die members and in a preferred construction a punch element is removably attached to its associated driver and shaped to permit opposite ends thereof to be employed in the punching operation. One or more punch elements may be loosely attached to their associated drivers.

Abstract: A punch and die system is disclosed as comprising punch and die templets serving to positionally locate punch and die assemblies relative thereto solely adjacent the region at which punching of a workpiece occurs in combination with guide assemblies for positonally locating the punch and die templets one to the other. The punch and die assemblies are designed to utilize interchangeable punch guide and die members and in a preferred construction a punch element is removably attached to its associated driver and shaped to permit opposite ends thereof to be employed in the punching operation. One or more punch elements may be loosely attached to their associated drivers.

Abstract: A method of manufacturing a fabric-covered article, preferably a belt buckle, and a method for trimming the excess fabric and backing sheet material from a fabric-covered article. Apparatus for manufacturing the fabric-covered article, preferably a belt buckle and for trimming the excess fabric material after the fabric has been glued to the backing sheet, with a buckle-shaped insert sandwiched therebetween.

Abstract: A cutter for punching a sheet of material having a fixed block disposed so as to face one side of the sheet, a moving blade disposed at the opposite side of the sheet relative to the fixed block, and a transporting roller disposed inside the moving blade. A punched-out portion is thereby transported along with a punched-remainder portion.

Abstract: A punch and die pair for turret punch presses including a punch guide with a punch holder slidable therein having a small replaceable punch insert locked axially and rotationally in the punch holder.

Abstract: A valve hole punching apparatus for a vehicle wheel wherein the punch and the bill punching a valve hole in the wheel wall can be adjusted in inclination. In such an apparatus, a wheel into which a valve hole is to be punched is brought to the punching position with its axis maintained in a vertical position. The wheel portion to be punched is punched out by the inclined punch and the bill positioned at a right angle. As a result, handling of the wheel is very easy and punching can be done very smoothly.

Abstract: To permit high-speed punching of complex shapes in extremely thin metal strips or ribbons, particularly for miniaturized semiconductor terminal elements, while using standardizing modular punch press components sush as a die, a stripper element and a punch carrier, with minimum longitudinal extent to suppress oscillations of the ribbon as it is being transported, at high punching frequencies, the stripper plate (2) is securely connected to a plurality of guide posts (6). Springs (18, 16) are provided which maintain the posts and the stripper plate in a base position, and lift the stripper plate above a die plate (1). These springs retain the posts, are circumferential spring rings (16) engaging a groove (17) in the posts and fitted in the die plate, or ball-and-detent arrangements (FIG.

Abstract: A hole puncher and reinforcer for locating a length of adhesive tape in overlying relation to a sheet of paper, for punching a hole in the tape and paper, and for shearing and pressing the tape in position as a reinforcement for the punched holes. The device includes a plurality of spaced apart first disks operative to engage the adhesive side of the tape and pull it off a supply roll. A similar set of disks rotatable at a peripheral speed faster than that of the first disks engages the tape and directs it through a tape feed passage defined in part by thin fingers. The placement and rotation of the two sets of disks, and the presence of the fingers, enables advancement of the tape to the punch, shear and pressure mechanism without sticking or gumming.

Abstract: A punch and die assembly for trimming the flared end of a can body comprises a reciprocable punch (10), and a split die (15) consisting of two semi-circular segments (14, 16) movable between an open position allowing infeed of article (A), and a closed position around the article. During co-operation of the cutting edges (35, 61) and (51, 62) on the punch (10) and die (15) respectively to trim the can body, the punch is centralized accurately in relation to the die by engagement of a radially outwardly facing surface (521, 74) on the die with a radially inwardly facing surface (321, 73) on the punch; rough alignment between punch and die having previously been achieved by engagement of further surfaces on the punch and die when the die was closed.

Abstract: An apparatus for drilling sheet material comprises a reciprocating subframe which rotatably supports an annular drill and pressing means. The pressing means holds the material down during drilling and strips the material from the drill when the subframe is raised.

Abstract: An elongate product such as a surface fastener or a slide fastener chain is cut off on a lower cutter blade by an upper cutter blade moving toward and coacting with the lower cutter blade. While the elongate product is being severed, it is pressed down against a base board by a first pressure pad. A severed piece is positively discharged off the upper and lower cutter blades by a second pressure pad which moves with the upper cutter blade. The second pressure pad includes a brush of electrically conductive bristles for removing static electricity from the elongate product and the severed piece.

Abstract: A piercing punch and ejection assembly has a piercing punch member provided with a bore in its point thickness section. The ejector member, included in the assembly, comprises a conical helical spring of rectangular cross section that is installed into the blind hole bore of the punch member.

Abstract: A punch press having a hydraulic actuator for extending and retracting the ram, a stripper sleeve coaxial with and guidably engaging the ram, and a hydraulically operated clamp encircling the stripper sleeve and normally in a release condition guidably engaging the stripper sleeve. Hydraulic fluid pressure supply apparatus is operable to a first condition supplying fluid pressure to the hydraulic ram actuator to move the ram forwardly, and a stripper clamp spring yieldably urges the stripper sleeve forwardly into clamping engagement with the workpiece as the ram is moved forwardly. The hydraulic fluid pressure supply apparatus is operable to a second condition supplying fluid pressure to the hydraulically operated clamp to clamp the stripper sleeve against movement and to also supply fluid pressure to the hydraulic ram actuator to move the ram to a return position while the clamp holds the sleeve against return movement.

Abstract: An improved tool holder for stripping work pieces from dies includes a cylindrical mandrel having a slotted boss extending axially from the upper end thereof. A plurality of tapped holes and a plurality of spring receiving holes extend into the upper end of the mandrel parallel to the axis thereof. A tubular collar includes a closed lower end having an axially disposed hole for receiving the slotted boss of the mandrel therethrough. The closed end of the collar includes a plurality of holes aligned with the spring holes and tapped holes of the mandrel. A piston is slidably received within the collar and about the boss, and includes a resilient bumper projecting outwardly from the end thereof. A first plurality of screws extends through the closed end of the collar and is received in tapped holes in the piston, the heads of the first plurality of screws being disposed in the spring receiving holes of the mandrel.

Abstract: A method of making double reverse corrugated material includes feeding the material between an upper die and a lower die. Each of the dies have laterally spaced projections and a stripper positioned in the spaces between the projections of the die. One die is moved toward the other die to form the corrugations in the material. One die is moved away from the other die while both strippers and the other die are maintained substantially fixed with respect to each other. The stripper associated with the moving die is then moved with respect to the other die and the stripper associated with the other die is then moved with respect o the other die to strip the formed double reverse corrugated material from the dies. The formed material is then moved out from between the dies.

Abstract: A preloaded spring assembly is disclosed having a compression coil spring received interior of a housing. The housing is made of opposed cup-shaped housing members having open ends with one of the cup-shaped members having a smaller diameter and having its open end projecting into the open end of the second housing member. The respective open ends are configured to provide a lock abutment preventing separation of the housing members beyond a certain dimension whereby the spring positioned interior of the housing members having its opposite ends in contact with the bottoms of the respective cup-shaped housing members is provided with a compressive preload. Also, disclosed is a method of manufacturing the preloaded spring assembly which configures the open ends to provide a mechanical interlock during assembly such that the spring is preloaded at the time of assembly.

Abstract: A removeable stripper plate assembly. The assembly includes a punch guide sleeve with a stripper plate support means to aid in supporting a stripper plate within and at the end of the punch guide sleeve. A split locking ring having adjacent ends moveable toward and away from each other is received in a groove in the punch guide sleeve, and extends inwardly of the punch guide sleeve to lock the stripper plate in place. Locking means are provided to maintain the spacing between ends of the split locking ring to thereby maintain it in the groove.

Abstract: A practice of severing a length of chain wherein the chain is supported and an interior link of the chain is severed at the link portion which passes through the central opening of an immediately adjacent link.

Abstract: A punch assembly for punching a workpiece comprising a unitary stripper spring assembly that can be adjustably fastened to a punch. The unitary stripper spring assembly includes a threaded head which engages a threaded end of the punch so the effective length of the punch can be varied after sharpening by simply turning the unitary stripper spring assembly relative to the punch. The punch is fastened to the unitary stripper spring assembly only at the head. The unitary stripper spring assembly further includes a washer, and a telescopic retainer enclosed in a stripper spring between the head and the washer. The telescopic retainer responds to the force exerted on the punch assembly by the ram of a punching device by contracting during the punching stroke. After the punching stroke the stripper spring expands to strip the punch from the workpiece and the stripper spring assembly returns to its normal position.