EP0069805A1 - Apparatus for the manufacture of sinus springs - Google Patents

Abstract

1. Apparatus for the production of wires for converting with U-shaped loops for converting under electrical contact discrete metallic components equipped with a pocket, with a feeding aggregate (131) for stepwise feeding of a wire, with a bending station (102) having two bending tools (108, 109) being arranged with a gap (110) to each other, the downstream tool (109) being movable for one feeding step out of the path of a formed U-shaped loop (122), and with a ram (112) being reciprocable into and away from the gap (110) between the bending tools, characterized in that the bending station (102) is arranged besides a straight channel (100), that a wire feeding mechanism (106) ending in the channel is provided, that the ram is reciprocable into and away from the gap between the bending tools and is arranged on the side of the bending tools facing the channel, and that the channel has a passage (116) for the ram.

Description

The invention relates to a method for staggering provided with a pocket metal hardware under electrical contact and a device for performing this method and a squadron for this method.

When surface treating small metal parts using an electric field, they must be spaced apart on the squadron. Bring about this arrangement is the subject of the aforementioned _V ER proceedings.

The question in question small metal parts are profiles, tubes, rings and the like with serving as a pocket recesses, holes, profile cavities or the like, the bags are usually covered in finished assembled small parts, so that it is useful to these small parts to support the surface treatment by a protruding into the pocket projection, because there are caused by the resting support surface defects least the least. The surface treatment using an electric field may be electrolytic processes, for example electroplating, electrolytic glazing, or anodic oxidation. It can also be carried out in normal atmosphere processes, such as the spraying of paint or paint. Anodic oxidation of aluminum is also called anodizing and carried out in the so-called anodizing bath.

It has been provided for such a scale metal plates with attached thorns on which the small parts are stuck with their bags. Such a relay is due to the erforder = union electrical contact with the thorns of electrically conductive metal and the electrical contact is achieved by touching under dead weight of the relevant metal small part. However, this electrical contact is uncertain and requires careful surface cleaning of the respective mandrels, which is required after each use, because the _S taffel inevitably involved in the surface treatment of the metal hardware.

The method according to the invention is based on the object to securely hold the small parts in the simplest possible way with good electrical contact.

The inventive method is characterized in that a resilient, electrically conductive wire is deformed in sections to laterally projecting U-arches, which individually fit tightly into the pockets and on which the small parts are plugged.

You can first bend the wire to the relay wire and then attach the small parts. But you can also unite these two operations by the U-bows are formed within the associated pocket and a corresponding archwire is driven from a straight, held in front of a pocket opening portion of the wire into the bag.

The U-bows can be bent in the small part, the small part serves as a bending template. However, this is not recommended if these small parts are to be protected from damage caused thereby. The carries a further development of the method bill, which is characterized in that two bending elements are fixed as bending templates for the wire with space to each other that a small part is fixed behind these bending elements, so that the pocket is aligned with the gap that the U-bends bent around these bending elements and through the Interspace is driven into the pocket, that then a _B iege- element is removed and is transported over the now free position of the removed bending element of the formed U-bend with the attached small part by advancing the wire, to a sufficiently long, subsequent, straight wire section in front of the gap. The main opposing forces occurring during bending are absorbed by the bending elements.

Another object of the invention is to provide a device of the type mentioned in such a way that in the simplest possible way, uniformly and continuously U-sheets can be formed in a wire.

• daß ein in den Drahtkanal mündender Drahtzuführer vorgesehen ist,
• daß ein auf den Zwischenraum zu und durch diesen hindurch hin-und herbeweglicher Stempel auf der dem Drahtkanal zugekehrten Seite der Biegeelemente angeordnet ist,
• daß der Drahtkanal einen Durchlaß für den Stempel aufweist, daß ein Vorschubaggregat zum schrittweisen Vorschub des Drahtes vorgesehen ist und
• daß das vorschubabwärtige Biegeelement für einen Vorschubschritt aus der Bahn des durch den Stempel geformten U-Bogens bringbar ist.

Such a device is characterized in that a bending station iegeelementen with two mutually spaced arranged _B is provided adjacent a straight wire channel

• in that a wire feeder opening into the wire channel is provided,
• in that a piston which is movable back and forth on the intermediate space and is arranged therethrough is arranged on the side of the bending elements facing the wire channel,
• that the wire channel has a passage for the punch, that a feed unit is provided for stepwise advancement of the wire and
• in that the feed-forward bending element for a feed step can be brought out of the path of the U-bend formed by the punch.

With this device, a continuous relay wire is produced, on the U-bows then the small parts can be plugged. A development of this device makes it possible to combine these two operations - the forms of U-bows and attaching the hardware to the U-bows - in a work cycle. This development is characterized in that on the side facing away from the wire channel of the bending elements a receptacle for a befindliches with his pocket in flight to the stamp small part is arranged, the one Has rear support for this small part and has an insertion opening for a loose small part and a discharge opening for a stuck on the U-shaped small piece.

A _S taffel, as used in connection with the method according to the invention and is produced with a device according to the invention is preferably characterized in that an electrically conductive wire is bent into U-arcs, the laterally spaced apart from the rest Straight wire protrude and the legs are spread to the open end with a small acute spread angle and fit under compression of their U-bows in an associated pocket.

Such seasons can be summarized in several to achieve a larger recording capacity. For this purpose, several _D rahtstaffellängen whose U-arcs each extend in a common arc plane, relative to their arc plane plane-parallel to each other and, based on their longitudinal extent, be suspended vertically and at a distance from each other on a common relay carrier. In this case, the _D rahtstaffellängen hang freely side by side and can move with their lower ends against each other.

Such movements can be prevented by the fact that the wire rod lengths are enclosed in a common frame, by being fixed with their respective upper ends on the upper, serving as _S taffelträger frame strip and with their lower ends to a lower frame strip.

For squadrons according to the invention, the small parts are clamped and the electrical contact is generated under clamping pressure, which can be 'high enough even with light hardware. With a sufficient clamping pressure can also achieve a secure contact, if the surface of the squadron has soiling, so that you can be satisfied with less cleaning. Such a relay is also extremely cheap to produce, so that one can represent a single use economically and then the need for re-use cleaning is unnecessary.

The wire-bent staff gives chemical pickling liquids for removal of an order in case of reuse free access, so that the pickling is easy to perform and you can use the relay several times repeatedly, as long as the wire thickness is sufficient despite the inevitable removal during pickling.

The U-bends can be due to the feathering of their legs, easily plug in the pockets and take out again, especially when the U-legs pressed together on an acute bracket, which is smaller than the splay angle, fit tight fit in an associated bag.

The invention is preferably applicable to the anodization of small parts of aluminum or aluminum alloys. In such a case, in order to avoid electrolytic stresses, a wire mesh made of aluminum wire is expediently used, which, in order that it has the necessary rigidity and resilience, is expediently hard-pulled.

For warehousing, it is recommended that a Drahtstaffelstrang from several formed from a common, continuous wire, lined-up grading lengths, the U-bows extend in a common arc plane, roll up on a storage bins, the U-bends curved over a curvature axis parallel to the respective sheet plane are.

After being treated, the small parts treated with the help of the squadrons can be removed from the squadrons, but they can also be left on the squadrons to be stored and transported in an orderly manner with the help of the squadrons until they are added to the squadrons for further processing Need to be taken out.

The invention will now be explained in more detail with reference to the accompanying drawing).

• Figur 1 ein Kleinteil, aufgesteckt auf einen U-Bogen einer Staffel nach der Erfindung,
• Figur 2 zwei Kleinteile, aufgesteckt auf benachbarte U-Bögen einer Staffel,
• Figur 3 den Abschnitt einer Staffel mit U-Bögen nach Figur 1 und 2,
• Figur 4 eine Abänderung der Staffel aus Figur 3, bei der die U-Bögen in verschiedene Richtungen weisen,
• Figur 5 mehrere Staffeln der Art, wie sie in Figur 3 dargestellt sind, eingespannt in einen gemeinsamen Rahmen,
• Figur 6 eine Bobine, auf die ein Drahtstaffelstrang aufgewickelt ist,
• Figur 7 eine Vorrichtung nach der Erfindung, von oben gesehen,
• Figur 8 den Teilschnitt VIII aus Figur 7,
• Figur 9 den Teilschnitt IX aus Figur 8.
• Figur 10 den Teilschnitt X aus Figur 7 beim Eindrücken des U-Bogens,
• Figur 11 den Teilschnitt aus Figur 10 beim Vorschub,
• Figur ₁2 einen Abschnitt einer fertigen Staffel, hergestellt mit der Vorrichtung nach Figur 7 bis 11,
• Figur 13 den Teilschnitt XIII gemäß Figur ₁2, und
• Figur 14 bis 17 anders geformte Kleinteile mit zugehörigen _U-Bögen in der Darstellung entsprechend Figur 13.

In the drawing shows:

• 1 shows a small part, mounted on a U-bow of a squadron according to the invention,
• FIG. 2 two small pieces attached to adjacent U-bows of a squadron;
• FIG. 3 shows the section of a squadron with U-bows according to FIGS. 1 and 2,
• FIG. 4 shows a modification of the squadron from FIG. 3, in which the U-bows point in different directions,
• FIG. 5 shows several stakes of the type illustrated in FIG. 3, clamped in a common frame;
• FIG. 6 shows a bobbin on which a wire tow rope is wound,
• FIG. 7 shows a device according to the invention, seen from above,
• FIG. 8 shows the partial section VIII from FIG. 7,
• FIG. 9 shows the partial section IX from FIG. 8.
• FIG. 10 shows the partial section X from FIG. 7 when the U-bend is pressed in,
• FIG. 11 shows the partial section from FIG. 10 during the feed,
• FIG. ₁ 2 shows a section of a finished squadron produced with the device according to FIGS. 7 to 11;
• 13 shows the partial section XIII according to Figure ₁ 2, and
• Figures 14 to 17 differently shaped small parts with associated _U- bows in the illustration corresponding to Figure 13th

The small parts 1 to 6 of Figures 1, 2, 3 and 5 are made of aluminum and each have a pocket, for example, the pockets 7, 8, 9, 10. The small part 1 is a piece of pipe whose interior is the pocket 7. The small parts 5 and 6 are pieces of pipe. The small parts 2, 3 and 4 have an open rectangular profile whose profile inside serves as a pocket 8, 9, 10. Squeezed into the pockets, tightly fitted, a U-bend bent from a spring-elastic wire 11 to 16, for example the U-bows 17, 18, 19, 20. The U-bends are, as now explained for the U-bend 20, with splayed legs 2 ₁ , 22nd shaped, in such a way that, as relieved in Figure 3 legs 21, 22 include a small acute spread angle 23 of about 5 to 15 with each other.

The U-bend 20 is dimensioned with respect to the associated pocket 10 so that it fits under slight compression of the legs 2 ₁ , 22 in the associated pocket 10, as indicated in Figure 3 by dotted lines. The dash-dotted lines 24, 25 indicate the extension of the clear width of the bag 10 and the dotted lines 26, 27 indicate the position of the legs 21, 22 within the pocket ₁ 0. The legs 21, 22 are not in the bag to parallelism, but only compressed on a pointed bracket 28. The holding angle 28 is smaller than the _S voriz- angle 23, preferably about 1/5 to 3/5 of the spread angle.

The illustrated in Figure 3, generally designated 30 season consists of a wire 13 which is serpentine curved to successive U-bends 20, 31, 32, 33, 34, 35. The U-bends extend in a common arcuate plane which coincides with the plane of the drawing of Figure 3 and are open alternately to opposite sides. With reference to FIG. 3, the U-bends 20, 32 are open to the left and the U-bends 31, 33, 35 are open to the right. Adjacent U-bows have one leg in common, for example, the U-bows 20 and 31 have the leg 22 in common. You can put on all U-bows small parts. Then you can use the respective U-bows but only about up to their hold length. A better fit is achieved if you omit a U-bend between two small parts and the small parts, for example, only on the pointing to one side U-bows, so for example in Figure 3 on the U-bows 31, 33 and 35th Then, however, results from the compression of the legs, a curvature of the central axis 37 corresponding to the curved line 38. The line 38 is drawn slightly exaggerated for clarity. One can prevent this curvature by clamping the squadron down and up, as will be explained below with reference to Figure 5.

The _U- bows of the season 30 are all formed identical to each other, with an arc length according to double arrow 40 of ₅ cm and an outer arc width at the height of the central axis ₃₇ according to Dcppelpfeil 41 of 1 cm, based on the unloaded bows. In these dimensions, a spread angle ₂₃ of ₁ 0 ° is recommended. Such U-bends are then preferably suitable for pockets with a clearance according to double arrow 42, which leads to a bracket 28 of about 5 ° with completely deferred small part. With these dimensions, a wire thickness of 4 mm (millimeters) at a circular _recommends cut rahtquer-.

Variations from the relay 30 of Figure 3 are shown in the following table. These amendments under- _five separate opposite the Season 30 only by the information provided in this table.

Amendment 3 of the table also serves for anodizing and modifications 1 and 2 are for electroplating or electrolytic glazing. All embodiments, that of Figure 3 and the modifications 1 to 3, can also be used for other applications, for example, for paint spraying or paint spraying with the support of an electric field.

In the embodiment of Figure 4, the wire 14 is bent to successive U-bows 50 to 60. The U-bows 50, 52, 54, 56, 58, 60 are the same size as the U-bends 20, 31, 35 of Figure 3 and extend, each by itself, in a horizontal scale in a vertical arc plane. The successive U-arches 50, 52, 54, 56, 58, 60 protrude but in contrast to Figure 3 in different circumferential directions, which, based on the viewing direction shown in arrow 61, can be assigned to different times, namely the U-bow 50th 3.oo o'clock, the U-Bogen 52 4.oo o'clock, the U-Bogen 54 5.oo o'clock, the U-Bogen 56 6.oo o'clock, the U-Bogen 58 7.oo o'clock and the U-Bogen 60 8.oo o'clock and so on for more, not shown U-bows.

The intermediate U-arches 51, 53, 55, 57, 59 extend in an oblique arcuate plane and can otherwise be shaped exactly like the U-arches 22, 32, 34 of FIG. 3. Preferably, only the U - Bows 50, 52, 54, 56, 58, 60 small pieces inserted, while the other U-bows remain unused.

In Figure 5, a plurality of squadrons 70 to 72 are shown, each of which is designed as the season 30 of Figure 3. The squadrons are, based on their longitudinal axis 74, vertically spaced 75 side by side clamped in a frame 76, with their respective upper ends in the upper frame rail 77 and fastened with their respective lower ends in the lower frame strip 78. The arc planes of the squadrons, for example the bowing plane of the squadron 70 indicated by the dotted line 79, extend plane-parallel to one another and, in the exemplary embodiment, are perpendicular to the plane of the frame 76.

The squadrons of Figures 3 and 4 are drawn broken and can have many more arcs than shown in the figures. You can also produce wire strands, which have a great many seasons in a row, from which you can then cut off the relay lengths if necessary. For storage and transport, such a staggered wire 81 can be rolled up on a reel 80. If this is a _D rahtstaffelstrang, the U-bows lie in a plane, it is advisable to make the winding so that the U-Boek are each curved over a curvature axis parallel to the sheet plane.

When treating the stakes are preferably arranged hanging down with the above part in the figure shown above part and the lower part shown in the figure below.

According to FIGS. 7 to 13, 101 denotes a motherboard on which a bending station 102 is arranged. The bending station has between two support plates ₁ 0 ₃ , 104 screwed together, a wire channel 100 in alignment with a dash-dotted line, supplied by a wire feeder 106, straight, electrically conductive metal wire 107. In addition to the wire channel 100, two bending bolts 108, 109 with spacing 110 serving as bending templates are arranged in the bending station. Of the observer of Figure 8 facing, downstream in the feed direction according to arrow ₁ 1 ₁ of the wire 107 bending bolt ₁ 09 is out of its extended in Figure 8 drawn _F unktions- position to a dashed line indicated retracted _S medium- lung retractable by means of a pneumatic cylinder ₁₁₇ ,

On the space 110 to a punch ₁₁ 2 is directed, which in the longitudinal direction according to double arrow 1 ₁ 3 by means of a pneumatic cylinder 114 back and forth. For this punch ₁₁ 2, a guide channel 115 is recessed between the holding plates 103 and 104, and a passage ₁₁ 6 is provided in the wire channel 100. The punch 112 is aligned with the gap 110 and is out of its advanced in Figure 7 position, in the he far projects through the gap, retractable into a retracted position in which he no longer protrudes into the space 110 and no longer crosses the wire channel ₁ 00. The reciprocation of the punch 1 ₁ 2 is limited by contacts 120, 121 in the path of a contactor ₁ 22. The two contacts 120, 121 are in the direction of the double arrow and medium- displaceable in the set _S lungs 113 fixed.

The punch 112 is removably mounted in the punch holder 124. On the side facing away from the stamp of the bending bolt ₁ 08, ₁ 09 is a small parts shaft 125 which extends vertically, ie to the viewer of Figure 7 to. The shaft 125 is drawn horizontally cut in Figure 7 above the lowest part of small parts, so that the small part 126 located in the lowest position is visible. In this lowest position of the shaft 125 for the small part 126 forms a receptacle 127, in which this small piece is aligned with its pocket 128 on the path of the punch 1 ₁ 2 coaxial and aligned with the gap 110. The receptacle 127 provides for this small part a rear _A b support 129. With 130 is a feed punch of a generally designated 131 feed unit. This feed punch 130 is reciprocable in the direction of the double arrow 132. It is attached for this purpose to a rod 133 which is mounted longitudinally displaceable in bearing blocks 134, 135 and is moved by a pneumatic cylinder, not shown in the drawing. The movement stroke is controlled by contacts 145,146 in the path of two contactors ₁₃ 6, 137 of the rod 133. The two contactors are longitudinally displaceable on the rod, so that the stroke of the feed punch 130.und its position is adjustable.

The feed punch 130 is shown in Figure 7 in the retracted position, it can be advanced in the direction of arrow 111 from this position into its advanced position, which is indicated by the dotted line 138. These are in the two shaft walls 140, 141, extending along the Stamp movement extend provided at the height of the lowermost position openings, namely an insertion opening 142 in the shaft wall 141 and a discharge opening 143 in the shaft wall 140. The discharge opening 143 is dimensioned so large that a small part 126 can be pushed through transversely. The discharge opening 143 is closed by an automatically closing, aufdrückbare to open flap 144.

• Es wird ein Draht 107 eingelegt und der Kleinteileschacht ₁25 wird mit gleichgroßen Kleinteilen gefüllt. Das freie Ende des Drahtes 107 steht um eine halbe Bogenlänge und Zugabe über den Biegebolzen 109 hinaus. Der Biegebolzen ₁09 befindet sich in seiner versenkten Ruhestellung. Nun werden die beiden Hydraulikzylinder 1₁₇ und 114 betätigt. Der kleinere Zylinder ₁₁₇ hebt sofort den Biegebolzen 109 in seine Funktionsstellung und kurz danach bewegt sich unter dem Einfluß des größeren Hydraulikzylinders 114 der Stempel 112 auf den Zwischenraum ₁₁0 zu in die Tasche des bereitgehaltenen Kleinteils ₁26. Dabei durchkreuzt er den Drahtkanal 100 und nimmt den Draht mit, der sich dabei um die Biegebolzen abrollt und zu einem U-Bogen in die Tasche-des Kleinteils 126 hinein erstreckt. Die für diesen U-Bogen benötigte Drahtlänge wird zur Hälfte von dem überstehenden Drahtende und zur Hälfte vom Vorrat des Drahtes abgezogen. Der Zwischenraum 110 und der Stempel ₁₁2 sind so breit bemessen, daß der U-Bogen stramm in der Tasche sitzt. Dann werden die beiden Zylinder 1₁₇ und 114 entlüftet und der Stempel 112 und der Biegebolzen 109 weichen zurück. Jetzt wird der nicht dargestellte Pneumatikzylinder für das Vorschubaggregat 131 aktiviert und der Vorschubstempel ₁₃0 macht einen Vorschub. Dabei nimmt er das nun auf den _U-Bogen ₁22 aufgesteckte Kleinteil 126 mit'und zieht ein entsprechendes Stück des Drahtes 107 nach. Der Vorschub des Vorschubstempels ₁30 ist dabei so groß gewählt, daß die Bildung des nächsten U-Bogens zur Hälfte durch Zurückziehen des soeben vorgeschobenen Kleinteils erfolgt.

The device is operated as follows:

• It is inserted a wire 107 and the small parts shaft ₁ 25 is filled with equal small parts. The free end of the wire 107 protrudes beyond half the arc length and beyond the bending bolt 109. The bending bolt ₁ 09 is in its sunk rest position. Now the two hydraulic cylinders 1 ₁₇ and 114 are actuated. The smaller cylinder ₁₁₇ immediately raises the bending bolt 109 in its functional position and shortly thereafter moves under the influence of the larger hydraulic cylinder 114 of the plunger 112 to the gap ₁₁ 0 in the pocket of the held small part ₁ 26. He crosses the wire channel 100 and takes the wire with it, which rolls around the bending bolts and extends into a U-bend in the pocket-the small part 126 into it. The wire length required for this U-bend is subtracted halfway from the protruding end of the wire and half from the supply of the wire. The gap 110 and the punch ₁₁ 2 are sized so wide that the U-bend sits tight in the pocket. Then the two cylinders 1 ₁₇ and 114 are vented and the punch 112 and the bending bolt 109 back. Now, the pneumatic cylinder, not shown, is activated for the feed unit 131 and the feed punch ₁₃ 0 makes a feed. He takes it now on the _U- bend ₁ 22 plugged small piece 126 mit'und pulls a corresponding piece of wire 107 after. The feed of the feed punch ₁ 30 is chosen so large that the formation of the next U-bow is done in half by retracting the just advanced small part.

The feed punch 130 now deviates into its initial position drawn back, the next small part 151 slips in the lowest position, ie in the receptacle 127 and the next U- 'bow ₁ 39 can be formed within the pocket of this small part. In this way, a season with already plugged small parts is formed in the progressive cycle.

If one omits or does not fill the small parts magazine in the illustrated device, then creates a squadron of a wire with lateral U-bows, on the U-bows later, for example, by hand, the small parts can be plugged.

For otherwise sized small parts, it is sufficient to replace the two holding plates 103, 104 with correspondingly differently arranged bending bolts and differently sized channels and a differently sized stamp 112 and use a correspondingly differently sized magazine with associated recording and on the basis of the contacts 120, 121 and the contactor 136, ₁ 37 to adjust the strokes, as far as this is necessary to adapt the device to the new shape of the small parts. The said parts, namely the punch 112, the holding plates 103, 104 with the bending bolt ₁ 08, 109 and the magazine 105 with the receptacle ₁ 27 are interchangeable for this purpose against correspondingly different sized parts.

Examples of such differently sized small parts are shown in Figures ₁ 4 to 17 and designated 147 to 150. The associated U-bends are designated ₁₅ 3 to 156.

Claims (10)

1. A method for staggering provided with a pocket metal hardware under electrical contact, characterized in that a resilient, electrically conductive wire is deformed in sections to laterally projecting U-bows individually fit individually tight in the pockets and on which the small parts are plugged. 2. The method according to claim 1, characterized in that the U-bows are formed within the associated pocket by a corresponding arch wire from a straight, held transversely before a pocket opening portion of the wire is driven into the bag. 3. The method according to claim 2, characterized in that two bending elements are fixed as bending templates for the wire with space to each other, that behind these bending elements a small part is fixed, so that the pocket with the _Z- space is aligned, that the U-bow is bent around these bending elements and driven through the gap in the pocket, that then a bending element is removed and transported over the now free position of the removed bending element of the formed U-bend with the attached hardware by advancing the wire until a sufficiently long, subsequent, straight wire section is in front of the gap. 4. Apparatus for carrying out the method according to claim ₁ , 2 or 3, characterized in that a bending station (102) with two with intermediate space ( ₁₁ 0) mutually arranged bending elements ( ₁ 08, ₁ 09) next to a straight wire channel ( ₁ 00) it is provided that a in the wire channel ₍₁ 00) opening out wire feeder) is provided ₍₁ 06), that a (to the gap ₁₁₀₎ to and through reciprocating plunger ₍₁₁₂₎ on the (the wire channel ₁₁₀₎ facing side of the bend arranged elements ( ₁ 03, 109), that the wire channel ( ₁₀ 0) has a passage ( ₁₁₆ ) for the punch ( ₁₁₂ ), that a feed unit ( ₁₃₁ ) is provided for the incremental advance of the wire and that the feed-forward bending element ( ₁₀₉ ) can be brought out of the path of the U-bend ( ₁₂₂ ) formed by the punch for a feed step. 5. Apparatus according to claim 4 for carrying out the method according to claim 2 or 3, characterized in that on the wire channel (100) facing away from the bending elements (108, 109) has a receptacle ( ₁ 27) for one with its pocket (128) in alignment with the punch ( ₁₁₂ ) located small part (126) is arranged, which has a rear support (129) for this small part and an insertion opening ( ₁₄₂ ) for a loose small part ( ₁ 26) and a discharge opening ( ₁₄₃ ) for a on the formed U-bow ( ₁₂₂ ) has plugging small part ( ₁ 26). 6. Apparatus according to claim 5, characterized in that the receptacle (127) is the last position of a small parts shaft (125), extending along the punch movement extending shaft walls ( ₁₄ 0, ₁₄₁ ) at the height of this last position on the one side Abförderöffnung ( ₁ 43) and on the opposite side for the entry of a feed punch ( ₁₃ 0) of the feed unit (131) are open. 7. Apparatus according to claim 4, 5 or 6, characterized in that the bending elements ( ₁ 03, 109) are round bolts, of which the vorschubabwärtig arranged is retractable. 8. Device according to one of claims 4 to 7, characterized in that the bending elements (10 ⁸ , ₁ 09) with their storage (103) and / or the receptacle ( ₁₂ 7) and / or the small parts shaft ( ₁₂₅ ) against differently sized Parts of this type are interchangeable, which are tuned to different sized small parts. 9th squadron according to one of the preceding claims, characterized in that an electrically conductive wire ( ₁₃ ) is bent to U-arcs, which protrude laterally from the otherwise straight wire at a distance from each other, and their legs ( ₂₁ , ₂₂ ) to each open end with a small acute spreading angle (2 ₃ ) are spread and fit under compression of their U-bows in an associated pocket (10). ₁ 0. _S taffle according to one of claims 1 to 8, characterized in that a plurality of wire rod lengths ( ₇₀ ...) according to claim 9, the U-arcs each extending in a common _B ogenebene (79), with respect to their arc plane plane-parallel to each other and, based on their longitudinal extent, are suspended vertically and at a distance from each other on a common relay carrier ( ₇₇ ).

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