Abstract: Device for providing, by an electrolytic process, a stripe shaped coating on an elongated conductive strip, said strip being guided along a rotatable wheel and provided with means for moving the strip in its longitudinal direction, in such a way that over part of the path the strip travels against at least part of the outer circumference of the wheel, whilst at the side of the strip remote from the wheel a stationary masking strip is provided, which covers at least part of the part of the strip which is in contact with the wheel and which is provided with holes, so that via the holes an electrolyte can be brought into contact with the part of the strip which moves along the holes during operation. A groove, extending in the longitudinal direction of the masking strip is provided in the side of the masking strip directed towards the strip, the width of said groove being equal to the width of the coating to be provided on the strip, whilst the holes debouch into said groove.

Abstract: The invention relates to a method and apparatus for electrolytic refining of copper and the production of copper wires for electrical purposes on a continual basis which produces round copper wires directly from impure copper anodes and to treat such wires in order to impart the desired characteristics as electrical conductors. The apparatus handles copper anodes of customary size refining them at normal current densities of less than 55 amps/foot.sup.2 onto starting wires of adequate tensile strength which is done continuously, the wire being provided to an electrolytic bath and, after withdrawal from the bath, the wires are finished by drawing and annealing.

Abstract: An electrolytic treatment apparatus has a seal structure for establishing liquid-tight seal at an end of electolyte path. The seal structure comprises a seal roll resiliently biased toward a rotary drum periphery and thus establishing sealing contact with a surface of the metal strip. The seal roll may be cooperative with an elastically deformable sealing member for establishing complete liquid-tight seal.

Abstract: A travelling wire electro-erosion machine in which an electrical discharge is generated in a narrow gap between a wire electrode and a work piece through a processing liquid so as to erossively remove material from the work piece. A wire guide device is provided for supporting and guiding the wire electrode wherein the wire guide device comprises a V-shaped guide member including coplanar intersecting guide surfaces, each of which have a single, continuous, convex arcuate wire engaging surface so as to prevent the wire from experiencing excessive stress.

Abstract: A rotary conductor roll intended to be partially immersed in an electrolyte in a manufacturing line for continuously electroplating a strip (2), the roll includes, on its periphery, at least one electrically conductive active zone (3) and at least one coated zone (41) coated with a flexible material which may optionally be associated with an adhesive and which serves to seal the contact between the strip (2) and the conductive active zone (3) from the electrolyte. At least one intermediate ring (42) is interposed between said conductive active zone (3) and said coated zone (41), said intermediate ring being made of a polymer for which at least one of the following coefficients is intermediate in value between the corresponding coefficients of the material constituting the conductive active zone (3) and of the material constituting said coated zone (41), said coefficients being: coefficient of expansion, flexibility, and swelling due to contact with the electrolyte, e.g.

Abstract: A dimensionally stable anode for high-speed galvanizing processes comprising a plurality of substantially parallel, foraminous layers, in electrical contact with each other, each layer comprising an inert, electroconductive substrate with an oxygen evolving electrocatalytic coating, characterized in that the current density of each individual layer is substantially the same and does not exceed the value corresponding to the minimum desired lifetime of the anode. The number of layers is sufficient to provide the total current density required for the high-speed galvanizing. The anode further comprises spacers suitable for preventing short-circuits.

Abstract: In an electrochemical machining system a continuous web metal is moved through a working region around a conductive roller in electrical contact therewith. Part-cylindrical cathodes are disposed coaxially with the roller a slight distance radially therefrom to define a working gap between the cathodes and the web. The positive and negative terminals of a DC source are respectively connected to the roller and the cathodes and an electrolyte fluid is injected under pressure through bores in the cathodes into the working gap and removed therefrom through other bores in the cathodes or establish a current flow between the web and the cathode for removing material from the former. Retainers confine the electrolyte emitting laterally from the working gap, and electrolyte falling vertically therefrom is collected in a basin. The speed of movement of the web around the roller may be varied as a function of the thickness of the machined web.

Abstract: An electro-erosion machine for automatic completion of a cutout according to a closed trajectory or whose ends reach the edges of a part to be machined, or for completing a hollowing by means of piercing the part to be machined all the way through, as well as separating, at a certain predetermined machining moment, a clipping still retained by a narrow bridge of material, said machine being fitted with a numerical control device and at least one machining head, as well as with an auxiliary device, designed to break the bridge which retains the clipping, said clipping being of any shape, and to drop or eject said clipping, the separating being accomplished either by percussion or by exerting a pressure on it, or by shearing the bridge or exerting a torsion-tearing couple on it, or by submitting it to a thermal effect or by localized radiation of the bridge. It can also include an attachment for receiving and automatically evacuating the clipping expelled in this manner.

Abstract: A selective plating apparatus (20) for zone plating is comprised of a contained supply (22) of plating solution having an elongated avenue of escape or nozzle (32) and anode means (42) mounted along the length of the avenue of escape (32) at a spaced location therefrom such that the plating solution leaving the supply (22) is charged by the anode means (42). The apparatus (20) further includes means (80, 94) for guiding a workpiece (120) having a zone (128) to be selectively plated through the apparatus (20) such that the zone (128) is proximate the avenue of escape (32), the workpiece (120) comprising a cathode means. The apparatus (20) includes means for maintaining a desired rate of plating solution through the avenue of escape (32) whereby the solution wets the selected zone (128) of the workpiece (120) and deposits a layer of plating in the desired zone (128) on the surface of the workpiece as it passes through the apparatus (20).

Abstract: A wire cut electric discharge machine for electric discharge machining a work (W) held on a work table (24). A wire electrode (14) supplied by a wire supplying device (12) is passed between upper and lower heads (22, 26) under tension through an electric discharge machining region where the work (W) is subjected to electric discharge machining.

Abstract: The device has a case (1) which has a wire guide (2) and a chamber (4) filled with machining liquid which is brought there under pressure by a pipe (7). A nozzle (5) in the shape of a truncated cone fits in the case and closes the chamber (4) in its normal working position by supporting its periphery on the flange (6) provided around the case (1), under the action of the pressure exerted by the dielectric liquid and if necessary by a return spring (8). The thrust exerted on the nozzle by an obstacle (10) during a lateral collision tilts the nozzle without damaging it and it causes at L an escape of liquid which causes the pressure to drop in the chamber (4). A transducer (13) signals the drop in pressure following the collision to the operator and/or to a control system of the erosion machine.

Abstract: In an electrolytic processing cell like an electroplating cell comprising a cell body and an electrode, the cell body is formed with an opening, the electrode is removably mounted in the opening by means of a hydraulic jack, and an inflatable sealing member is disposed between the opening and the electrode for releasably providing a seal therebetween.

Abstract: The invention is concerned with an electrolyte injector for an electrogalvanizing line, wherein electrolyte is injected backwards into the space between the steel strip 14 and the anodes 15. The injector, disposed on the side where the rising strip leaves the electrolyte bath 12, has a nozzle 9 provided with a plurality of injection pipes 11 allowing the electrolyte from the bath 12 to pass freely between these pipes 11.

Abstract: An apparatus in which a wire electrode is pulled off a supply reel, passes through a predetermined path, is led to the machining portion of a work piece to cut the work piece, there-after, the wire electrode is turned back, is returned along the path it has come to the machining portion of the work piece, and is used again to work the same work piece. At least one of these two segments of the wire electrode is advanced in a zig-zag path along the machining line when the work piece is cut, thereby allowing the working gap to be widened for improving the efficiency and accuracy of machining.

Abstract: A wire guide for wire electrode type electrical discharge machining be employed both for taper machining and for non-taper machining with high accuracy, regardless of the magnitude of the taper angle. The guide can be readily connected to (threaded with) a wire electrode and can be employed in an electrical discharge machining apparatus having an automatic wire connecting (threading) system. The wire guide is provided an arc-shaped guide arranged at a location concentric with a wire electrode for electrical discharge machining, a three-point-supporting guide arranged closely to the arc-shaped guide along the wire electrode for allowing the wire electrode to pass therethrough, and an external tube member for holding the arc-shaped guide and the three-point-supporting guide therein. The guide has a center hole for allowing the wire electrode to pass therethrough and a cooling liquid supply hole for supplying a cooling liquid for cooling the wire electrode.

Abstract: An electroplating cell includes a chamber which defines at least one elongated slot. The chamber is fixedly mounted in place such that the slot extends along a translation axis, along which parts to be plated are moved. An elongated brush is fixedly mounted in the chamber to pass through the slot in order to wick plating solution from the chamber, through the slot, into contact with the parts to be plated. The slot and the brush preferably define a large aspect ratio in order to provide high precision plating of small selected surfaces in combination with high plating rates. Preferably, the brush includes a dielectric strip, an anode strip, and a fabric sleeve which is stitched to the dielectric strip to hold the anode strip in place.

Abstract: In a radial plating cell comprising a winding roll for winding thereon a metal strip, an arch-shaped anode spaced at a predetermined distance from the winding roll, and a pair of edge masks interposed between the winding roll and the anode in register with the edges of the metal strip, a mechanism for moving the edge mask is comprised of a drive screw and a travelling nut engaged thereon and received in a channel which is formed in the anode surface and extends in the transverse direction of the metal strip, whereby the edge mask secured to the nut is moved along the drive screw with rotation of the drive screw.

Abstract: The electric discharge machining apparatus of the wire-cutting type comprises a wire-treating unit (48) movable in the horizonal direction relative to an upper wire guide member (12) between the upper wire guide member and a work table (10) to traverse a wire electrode (W) extending downward from a wire passage (13) of the upper wire guide member. The wire-treating unit has a base block (55) and a movable block (56) that can approach to and separate from the base block to define a slit (60) and a nozzle hole (61) that can be opened and closed between the two blocks. The slit extends in the horizontal moving direction of the wire-treating unit to receive the wire electrode therein. The nozzle hole can be connected to the lower end of the wire passage of the upper wire guide member, and the nozzle hole is constructed so that a spray liquid supplied into the wire passage of the upper wire guide member can be injected into a wire passage (15) of a lower wire guide member (14).

Abstract: Method and apparatus for plating metal or metal alloy on a well-defined area of the surface of an article by forming a liquid plating bath having its surface maintained slightly above the rim of a container by surface tension and passing the surface to be plated in contact with the surface of the bath and spaced from the rim of the container.

Abstract: A wire guidance arrangement for guiding a wire electrode of a spark erosion machine has several replaceable wire guides, which are mutually spaced to thereby form individual erosion zones. The individual wire guides are held by spring tension in corresponding openings of a guide plate, which rest on a base block. The common plane of the guide plate and the base block forms a reference plane on which are axially centered the undersides of wire guidance members of the individual wire guides. Even in the case of a greater wire electrode fixing length, this always ensures a satisfactory guidance of the wire electrode. In addition, the individual wire guides can be simply replaced without any adjustment being necessary.

Abstract: A method and apparatus for automatically rethreading the electrode wire of a traveling wire EDM apparatus through a pair of close tolerance wire support and guide members, one disposed on one side of a workpiece and the other on the other side of the workpiece, and for threading the end of the wire through a starting aperture in the workpiece. Prior to threading or rethreading the wire, the wire is heated in a heating zone while a pull is exerted on the wire such as to elongate the heated portion of the wire to reduce its diameter. After cutting off the wire at the beginning of its reduced diameter portion, the reduced diameter portion of the wire is threaded through the wire guide members and the aperture in the workpiece. The threading of the wire is effected by a feed mechanism disposed upstream of the first wire guide member which preferably is the same mechanism as the brake mechanism effecting a pull on the wire during normal operation of the EDM apparatus.

Abstract: An anodic belt electroplating apparatus utilizes a flexible, electrolyte permeable belt anode with porous outer belt covering that provides flexible operation parameters. The perforate belt anode such as of valve metal in mesh form, has an electrocatalytic coating and an electrolyte-containing wrap for the outer belt covering. Processing parameters can provide desirable electroplate, such as of metal coils electroplated in strip form through an at least substantially flat and horizontal electroplate zone, at highly desirable plating speeds as well as providing careful control over plate composition and deposition thickness.

Abstract: Process for continuous electrolytic treatment of metals which employs treatment units comprising pairs of vertical cells characterized by the fact that the electrolyte is moved in a controlled manner and in such a way as to ensure the desired electrolyte flow-rate values and constancy of such values in each cell employed for said treatment.

Abstract: A power supply component for cutting a wire electrode of an electroerosion machine having a core of hard metal and about it a layer of an electrically conductive material, which is softer than the core. Within a relatively short time, when the machine is in use, the wire cuts a notch in the soft layer, the notch acting as a wire guide. As soon as the notch reaches the harder material of the core, the hard metal prevents any further notch deepening.

Abstract: To increase the cutting performance of a wire electrode for electroerosive cutting, the surface of the wire electrode is provided with projections and recesses created by twisting the wire electrode of polygonal cross section about its axis.

Abstract: The invention relates to a vertical electroplating cell for processing metal strips in which the strip to be processed running from an upper conductor roll is led to a lower deflecting immersion roll and from there to a further upper conductor roll, the respective descending and ascending strip portion to be processed being subjected in a canal between vertically disposed anodes to the electrolyte flow conducted in circulation at high speed against strip running direction. In such a electroplating cell the circulation of large electrolyte amounts using the minimum possible pump energy is achieved in that the electrolyte flow directed in each case in the canals (6, 7) between the anode rows (5, 7) against the strip running direction are generated via liquid jet pumps disposed on outer canals between rear sides of anode rows and housing walls.

Abstract: A plant for electrolytic surface treatment and especially for descaling of a metal strip (2), comprising for the treatment of the same single face of the strip, at least two electrode-rolls (4) which are entirely immersed in a bath of electrolytic liquid and over which the strip passes. The rolls are covered with an insulating coating consisting of a series of spaced bearing rings centered in planes perpendicular to the axis of the roll and between which are provided annular treatment spaces, the bottom of which consists of a conductive wall, and the bearing rings are offset axially from one roll to another so that, in the direction of travel of the strip, the regions treated between the bearing rings of one roll correspond to the bearing regions on the rings of the succeeding roll, and vice versa. The plant can be applied, for example, to the cleaning, pickling or dechroming of a strip travelling at a high speed.

Abstract: In a travelling wire EDM apparatus having orientable swivelling wire guide and support members, or wire guide heads, the orientation of each wire guide head is effected by a pair of hydraulic slave cylinders each connected to a master cylinder. Each master cylinder has an input member displaceable along one direction and the desire inclination of each wire guide head is the resultant of the composite motions of the output members of the corresponding slave cylinders.

Abstract: An apparatus for plating a metal strip in an electrolytic cell is provided with a supporting roll. The support roll is disposed apart from the deflector rolls by a predetermined distance and supports the metal strip in such a way that the catenary of the metal strip can be reduced. The distance is determined so that the catenary is 0.04 or less times of the distance between upper and lower electrodes in the electrolytic cell. When the metal strip is a steel plate having a density of 7.85.times.10.sup.-6 (kg/mm.sup.3), the predetermined distance l (mm) between the axis of the deflector roll and that of the supporting roll is subject to the following formula: ##EQU1## in which the distance between the upper and lower electrodes is .DELTA.D (mm), the thickness of the metal strip being t (mm), the width thereof being W (mm) and the tension applied to the metal strip being T (kg).

Abstract: A cylindrical electrolytic treatment vessel, containing an electrolyte and serving as one electrode, rotatably mounts in a concentric manner a cylindrical rotary body which is mounted for rotation horizontally about its axis. The cylindrical rotary body has enlarged diameter portions at opposite axial ends and at least the peripheral surfaces of the enlarged diameter portions are made of an electrically insolative material. The rotor body has a central smaller diameter portion intermediate of the enlarged diameter portions which is formed of metal and constitutes a second electrode. Electricity is applied between the treatment vessel and the cylindrical rotor body electrode. The metal web is rotatably supported along opposed side edge portions of the web by the electrically insulative surfaces of the enlarged diameter portions of the body so that continuous electrolytic treatment is effected to the metal web as it passes through the electrolyte.

Abstract: An EDM device includes two support bars bearing on the same reference surfaces as the workpiece. Gibs are provided which engage into driving units able to displace them axially while holding them at a small distance under one support bar. The other support bar carries the receiving units wherein the gibs engage at the end of their stroke. Each driving unit may push the gib engaged therein against the lower surface of the respective bar. Whenever one or several such gibs are stopped under a part cut out of the workpiece, the part will lie thereon and remains fixed even after the electrode has completed a closed path cutout by electroerosion separating the cut-out part from the workpiece. The cut-out part may then be automatically removed by means of a mobile member equipped with a suction cup.

Abstract: Apparatus for the electrical discharge machining of a circumferential section from the wall of a bore in a metallic cylinder has a housing and a wire electrode guide disposed within the housing. A wire feeder continuously feeds a wire electrode to the wire electrode guide. The wire electrode guide also moves the wire electrode radially into and out of an axial groove extending between the circumferential grooves in the bore wall. The wire electrode guide further moves a wire electrode, when the wire electrode is disposed within the axial groove in the bore wall, between a first position in which the distance along the bore wall between the point where the wire electrode enters and leaves the axial groove is the same as the distance between the circumferential grooves, and a second position in which the distance along the wall of the bore between the point where the wire electrode enters and leaves the axial groove is greater than the distance between the circumferential grooves.

Abstract: To simultaneously machine a plurality of workpieces, 6, 6a a continuous wire electrode 2 supplied by a feed unit 1 is reversed by a pulley 21 below the movable mounting table 7 after passing down through one of the workpieces, and led back up through the other workpiece to a tensioning takeup unit 11. The wire electrode runs 2, 2a are maintained parallel by upper guides 3, 3a secured to a common mounting plate 20, and relative movement between the electrodes and workpieces is controlled to discharge machine identical configurations in both of them.

Abstract: The gap width g between a workpiece 12 and the outlet of a nozzle 7, 8 is automatically and continuously controlled in accordance with a predetermined configuration of a groove 15 being machined to facilitate the exhaust of injected machining liquid 10 and entrained dust particles 14 from the groove.

Abstract: A wire-cut electric discharge machine in which a current supplying member is in direct contact with a wire electrode, the shape of the current supplying member and the direction of passage of the wire electrode before and after the member being adapted to each other to prevent the formation of narrow gaps of sharp wedge-shaped cross section which could lead to harmful discharge and damage to the wire electrode and possible breakage of the wire electrode. In a preferred embodiment the current supplying member has a thick heel portion and a narrow sole portion and cooling fluid is discharged against the narrow sole portion.

Abstract: A wire cut electric discharge machine having: a taper-machining table (6a) secured to the lower end of a vertical column (5a) disposed above a word table (T) capable of being moved in respective directions of an X-axis and a Y-axis perpendicularly intersecting each other in a horizontal plane and capable of being moved in respective directions of a U-axis and a V-axis perpendicularly intersecting each other in another horizontal plane parallel to the horizontal plane containing the X-axis and the Y-axis: a wire guide (7a) for guiding as wire electrode (9a), secured to the taper-machining table assembly (6a), and having a machining fluid spouting nozzle; and a cylinder member (24) fixed to arm (20), an elastic bag (28) contained in the cylindrical chamber (26) of the cylinder member (24), a plunger (30) vertically movably fitted in the cylindrical chamber (26), a roller (32) rotatably attached to the lower end of the plunger (30) and a branch pipe (34) which utilizes the pressure of a branch flow of the machin

Abstract: In a method for high-speed electrolytic-deposition of metallic layers on ribbon or cord-like strips, the strips which are electrically connected to the negative side of an electric DC power source are moved through a hollow guide rail containing an electrolyte solution and past an anode structure arranged within the hollow guide rail and connected to the positive side of the DC power source. An electrolyte solution circulating conduit structure including a circulating pump is connected to opposite ends of the guide rail and, while the metal is deposited on the strip which is moved through the guide rail in one direction, the electrolyte solution is circulated through the guide rail in the opposite direction at a speed which provides for a Reynolds No. of over 80,000 with regard to the relative strip speed in the electrolyte solution so as to provide turbulent flow conditions adjacent the strip surface which greatly increase the electrolyte deposition rates.

Abstract: A traveling-wire electroerosion machine with nozzle assemblies on each side of the workpiece, has at least one of these nozzle assemblies formed with a rotatable outlet member with a caster-like formation engaging the workpiece surface to orient an inclined machining liquid orifice against the back of the wire electrode and in the direction of the machining front at an inclination to the linear wire travel path through the workpiece.

Abstract: This invention relates to an electro-plating device which is suitable for plating minute portions on protruding tip ends of a connector terminal. This invention device uses a plating solution supplying member in the form of a thin box which is erected upon a plating solution supplying box and which has a thickness small enough to be inserted between opposing plating areas. The plating areas are a pair of protruding tip ends of the connector terminal which move in contact with or near the supplying member. The plating solution supplying member comprises a combination of a supporting member made of an insulating sheet having a vertical section substantially shaped like an inverted letter U and a plating solution retaining member of a net or porous sheet which is supported by the supporting member to drape over the outer surfaces thereof.

Abstract: A selective plating apparatus having a multipitch centerline feed block for delivering a uniform blade of plating solution to a mask and which provides passageways for the drainage of used electrolyte solution. The delivery of a uniform blade of plating solution to the mask allows the mask to be designed such that it controls both the area of sample to be plated and the pitch of the sample.

Abstract: An apparatus for plating interior surfaces of electrical terminals that are attached to a carrier strip comprises a mandrel having first and second portions, the first portion being comprised of dielectric members which are mounted for rotation on a shaft as strip fed terminals are continuously fed to the first portion; wrapped against it and exited therefrom; and a second conductive portion mounted in a stationary portion on the same shaft. First dielectric portion includes a plurality of nozzles distributed about its axis of rotation. A plurality of anode members are mounted within the nozzles, the anode members being movable into and out of interiors of terminals that are wrapped against the dielectric portion. A conduit supplies plating solution under pressure through the nozzles and upon anode members.

Abstract: A wire cutting type electrical discharge machining system includes a wire supply device, an upper and lower electrode guides, and a wire take-up device for feeding a wire electrode so as to carry out the discharge machining on an electrically conductive workpiece. An improved wire-disconnection detecting device attached to the system includes a first and second wire-slack detecting members of metallic tube through which the wire is passed with a small distance formed therebetween, a wire-disconnection detecting circuits connected between the detecting members and the wire, including a power supply, and a sensor for sensing a flow of current from the power supply through the detecting members and the wire upon contact of the two due to a slack of the wire. A disconnection of the wire is detected when the flow of current is sensed by the sensor.

Abstract: An anode assembly for plating contact areas within socket terminals is comprised of a conductive body member having an anode means extending forwardly from a body section, and a dielectric shroud having a profiled passageway extending axially therethrough, the dielectric shroud being removable mounted to said body section that said shroud extends coaxially around said anode means. The profiled passageway of the shroud includes a terminal receiving section which is disposed around the anode means, extends forwardly thereof, and has an inner diameter selected to be just greater than the outside diameter of a terminal to be plated. The terminal receiving section further includes lead-in means whereby a terminal members is relatively received into the terminal receiving section and locatable concentrically about the anode member.

Abstract: A pair of guide devices 5, 6 for the wire electrode 1 in a discharge machining apparatus are disposed just above and below a workpiece 3. Each device includes three or more equally circumferentially spaced guide rings 8, 9, 10 surrounding the electrode and biased outwardly by tension springs 11, 12, 13 coupled to an enclosing frame member 7,to thereby center the electrode and prevent any lateral displacements during use. As an alternative the rings may be replaced by guide balls, 22, 23, 24 biased radially inwardly against the electrode by compression springs or fluid cylinders.

Abstract: This is a plating device for partially electroplating connector terminals at the tip, the target portions to be plated being a pair of forked portions of each connector terminal that are opposing to each other. In this partial plating device, a plating solution supply member to be inserted between the pair of target portions in the connector terminals comprises a support member, anode, net member and winding means. The support member has a top portion substantially forming an arrowhead with slanted guide planes on both sides. An opening is provided at or near the tip of this top portion to allow seepage of the plating solution. The net member covers the top portion of the support at its tip as well as the surface in its vicinity, the net member being freely wound up in the direction intersecting the passage line by the winding means and forming a supply section for the plating solution at a location corresponding to said passage line.

Abstract: A spark erosion machine having two spaced apart wire electrode guidance heads, which are forcibly coupled with one another in such a way that the guidance heads are always coaxial to one another. The forced coupling takes place by a hydraulic system that includes adjusting cylinders for the guidance heads and associated control cylinders. The piston rods of the adjusting cylinders are coupled to one another. By the use of hydraulic circuits, a displacement of the piston rods of the control cylinders leads to a corresponding displacement of the piston rods of the associated adjusting cylinders, so that the orientation of both wire guidance heads is always the same. As a result of this hydraulic system, there is no need to couple the upper and lower wire guidance heads by a mechanical linkage, so that the working zone between the heads and the lateral area for the workpiece connected thereto can be of a random magnitude.

Abstract: A device for straightening the wire of a wire electroerosion machine includes a straightening block that is displaceably arranged on a beam and that can be fixed to the clamping table of a machine tool. The block has a through-opening, and a corner portion of the block is missing. In the vicinity of the side walls of the remainder of the block, an electrically contacting means is provided under each side wall. The longitudinal axes of the contacting means are at right angles to one another and are located in the same horizontal plane. The particular contacting means contains a bolt, which is located in a bore running roughly at right angles to the central bore in the block. At the end of the bolt located in the central bore is eccentrically provided a contact element having a cylindrical surface. The eroding wire can be brought into contact with the surface of the contact elements of the two contacting means.

Abstract: Axial tension on the wire or strip like electrode is achieved by having the electrode looped around a grooved wheel controlled by a hysteresis motor near an upper or lower guide head while the wire drive is located near the other guide head so that in the working zone the electrode is subject to the action of tensile stress necessary for electroerosion and the remaining electrode guide area is kept free from increased tensile stress on the electrode. Additionally an angle coder is used with the hysteresis motor to measure both the rotational speed and the position of the grooved wheel.

Abstract: A novel contact roll assembly particularly suited for use in electro-chemical plating of metallic strip. A contact roll is rotatably mounted on a stationary support which is attached to a bus bar. Regions of contact between the stationary support and the contact roll are preferably by metallic inserts carried by the support. The inserts not only provide support for the contact roll but also provide bearing surfaces for journalling the roll and provide large surface contact areas for flow of plating current.

Abstract: A wire cutting type electrical discharge machining system for removing metal by utilizing of an electrical discharge energy between an electrically conductive workpiece and a wire electrode which is continuously fed lengthwise relative to the workpiece, including a frame, a wire guide conduit, and a flexible tube inserted in the wire guide conduit. The wire guide conduit is disposed fixedly with respect to the frame, so that the wire electrode is passed through the conduit. The flexible tube is axially slidably moved in the wire guide conduit in a telescopic fashion such that an outer end of the flexible tube is movable outwardly away from a corresponding end of the wire guide conduit, to an access position at which one end of the wire electrode may be easily inserted into the flexible tube through the outer end thereof and guided by the flexible tube into the wire guide conduit.