DE8133321U1 - Device for loop-shaped bending of a continuous wire - Google Patents

Description

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Stw .: create wire comb binding-bending chamber-I Nürtingen. Nov. 11, 1981 - Womako File 669

Device for loop-shaped bending of a continuous wire

The invention relates to a device for loop-shaped bending of a continuous wire, in particular for producing a wire comb whose prongs are made from There are hairpin-shaped, closely spaced wire sections which are passed through in the longitudinal direction of the Wire comb extending, one behind the other arranged wire sections are connected.

Wire combs of the aforementioned type are used to bind blocks by pre-bending the wire combs in a C-shape, dividing them into wire comb sections into those in the area a side edge in the blocks introduced holes are introduced and closed.

Several types of devices for producing wire combs of the aforementioned type are known. In one type, the wire is wound around two rows of pins by means of a winding tool, whereupon the The distance between the pins of the two rows is increased. As a result, the wire is stretched so that he the assumes the desired shape, that is, fits tightly to the pins, and by stretching it beyond its elastic limit is also fixed in this desired shape 3 805 579, 4 047 544 and 4 165 768 pointed out. With these Devices, it can happen that the wire breaks at higher working speeds *

In another type of device, the wire is formed using rotating, interlocking forming tools

Deputy: Establish wire binding-bending chamber -I Nürtingen, November 11, 1981 - Womako file 669

preformed and brought into the final shape by downstream, circumferential tools provided with grooves. See U.S. Patents 3,046,694 and 3,670,781 as an example of such devices. In these devices, the wire is also heavily loaded, the wire being in particular due to the downstream forming tool is exposed to strong friction, which is a disadvantage in the case of surface-treated wires. There are also devices in which the wire is wound around two rows of pins again using winding tools, whereupon pliers are then used in the area of the pins shape the wire around the pins and so into the desired Bring shape. See U.S. Patents 2,047,771 and 3,556,166 as examples of such devices. These Devices are limited in their performance. It has also been proposed according to DB-OS 2 148 915, To arrange pins for bending the wire on chain pins of a rescue and the chain links while rotating the Fold the chain together. This device must be followed by a further device for the final shaping of the wire. B. Snails, suggested- As in the As explained in the penultimate section, the wire is heavily stressed by friction in such forming tools, i.e. its surface can be damaged.

The invention is based on the object of providing a high-performance device that gently treats the wire to create the type mentioned at the beginning.

This object is achieved according to the invention in that two supports rotatable about axes, on their mutually facing end faces at the same distance from the axis of rotation

Stw .: create wire comb binding-bending chamber-I Nuertingen, November 11, 1981 - Womako file 669

of the respective carrier and with the same distance bending mandrels are arranged to one another, are arranged eccentrically and axially spaced from one another in such a way that that they partially overlap and limit a guide channel for flying the wire that the two carriers alternately one after the other are drivable step by step in opposite directions, and that means are provided for removing the wire loops from the bending mandrels.

The advantage of the specified device is that the wire is brought into the desired shape only by one-time, successive bending steps. The wire is neither stretched to stabilize its shape, nor is it stressed by rubbing molding tools. Because the bending mandrels are forming and bending tools at the same time, the device can be constructed in a relatively simple and compact manner, which guarantees a very high cycle rate and thus a correspondingly high performance of the device. The axes of the two supports are expediently parallel, so that an optimal guide channel for the wire is formed by, according to a further feature, the mutually facing end faces of the supports are plane-parallel at least in the areas delimited by the bending mandrels. In the known devices working with shaped pins, the wire must be removed from the rocking tool, which has a bending mandrel, by means of a stripper. Such scrapers are not necessary in the device according to the invention if, as is provided in a further embodiment, the bending mandrels are movably mounted on the carriers, and if \

Control means for the mandrels are provided that the

Deputy: create wire comb binding-bending chamber-I Nürtingen »November 11, 1981 - Womako file 669

Bending mandrels after each bending of the wire from one Working position in which they protrude into the guide channel, move them out of the guide channel and before they bend the wire again, move it back to the working position ο true-to-shape bending of the wire can be supported according to a further embodiment in that controllable, cooperating with the bending mandrels Holding means are provided, which hold the wire in each subsequent downtime after a bending step hold the respective mandrel. Levers pivotable about axes parallel to the axes of the carrier are used as holding means suggested. For the trouble-free conveyance of the bent wire, according to a further feature, protrude into the guide channel Fixed guides which conduct the bent wire into it, so that the wire after removal from the bending mandrels is guided on all sides. In order to keep the masses to be accelerated and decelerated as small as possible, a separate indexing gear is assigned to each carrier. Index drives not only refer to mechanical, instead of a continuous drive movement in an intermittent output movement changing gear also understood electric stepper motors or electrically controlled hydraulic motors. Pie holding means can of continuously revolving control cams are operated. The bending mandrels are expediently parallel to the axes the carrier is slidably mounted in this. With such a storage of the bending domes, they can be fixed by means of stationary Control cams are actuated. By gradually bending the The wire is set to vibrate in the area where it is fed. In order to control this, according to a

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Deputy: create wire comb binding-bending chamber-I Nuertingen, November 11, 1981 - Womako file 669

A wire guide is arranged upstream of further characteristics of the guide channel and can be controlled in a plane aligned with the guide channel in accordance with the movement of the wire caused by the bending mandrels. The wire to be processed is usually taken from a rolled supply of wire so that the wire should be straightened before bending. The wire guide is therefore expediently designed as a wire straightening device. Such a wire device can consist of two groups of pods each leading between them, the groups being arranged one behind the other and in a plane perpendicular to one another. Reliable guidance of the wire is achieved when the axes of the group of rollers facing the guide channel run perpendicular to the guide channel. The group of rollers facing the guide channel can be mounted on a common holder which can be pivoted about an axis perpendicular to the guide channel.

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Stw .: wire duct connection manufactures-bending chamber-I Nuertingen, November 11, 1981 - Womako files

The invention is explained in more detail using an exemplary embodiment shown in the drawing.

Show it:

Figure 1

Figure 2

Figures 3a to 3h

Figure 4

a device for loop-shaped bending

of a wire in perspective,

the left half of the device of the figure in section,

different working positions of bending mandrels and holding means of the device in schematic representation,

a controlled wire guide arranged upstream of the device in FIG.

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Deputy: create wire comb binding-bending chamber-I Nuertingen, November 11, 1981 - Wotnako file 669

The device shown in Figure 1 consists of two of the same or only slightly different components built in the same conception assemblies 1a and 1b, which are arranged opposite one another in such a way that their bending tools face each other and in the vertical direction corresponding to the length of the to: be bent Wire loops are offset. %

The section shown in FIG. 2 through the assembly 1a in FIG. 1 runs first horizontally through an axis 2a indicated by dash-dotted lines and then vertically through an axis 3a indicated by dash-dotted lines. The cross-sectional shapes of the bending tools in the form of mandrels Ia, Ha, Ha, IVa and Ib, Hb, IHb, IVb %

can be seen in Figures 3a to 3h, the black colored bending mandrels are each in working positions in which they are in one between the assemblies 1a and 1b located guide channel K (see Fig.2) ■ protrude, while those shown only in their outer contour; Bending mandrels moved out of the aforementioned working position are, d. H. do not protrude into the guide channel K. The bending mandrels Ia ... IVa are hairpin-shaped in their shape curved prongs (loops) Z connecting sections A of the wire comb DK to be bent and the bending mandrels Ib ... IVb adapted to the hairpin-shaped prongs Z.

The following description of assembly 1a also applies to |

the assembly 1b, where instead of the reference numerals? supplementary letter a, the letter b is to be set. There is an extra charge for parts that differ in shape

pointed out. In order to maintain clarity, |

Figure 1 shows only some of the gear elements in phantom-S

posed. I.

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Stw .: Establishing a wire comb binding - bending chamber ~ I Nuertingen, November 11, 1981 - Womako file 669

In a housing 4a, by means of ball bearings 6a, 7a, a carrier 8a designed as a body of rotation is mounted, which is formed by rotating parts 9a and 11a screwed together. A switching cross 12a with guide grooves 13a of a step gear 14a in the form of a known and therefore not shown and described in detail Geneva gear is screwed to the rotating part 11a. In sliding bushes 16a and 17a inserted into the rotating parts 9a and 11a, four slides 18a are arranged at the same distance from the axis of rotation 2a and the same distance from one another. These slides 18a can be displaced parallel to the axis of rotation 2a and, on their end faces facing the guide channel K, carry the bending mandrels Ia or Ha or purple or IVa. A guide roller 19a and a control roller 21a are mounted on each slide 18a. The guide rollers 19a are guided in guide grooves 22a machined into the rotating part 9a and run parallel to the axis 2a and secure the slide 18a against rotation. The control rollers 21a roll on a control means in the form of a stationary control cam 23a, which is part of a cover 24a screwed onto a bearing bore for receiving a carrier 8a in the housing 4a. The control rollers 21a of the slide 18a are pressed against the control cam 23a by compression springs 27a embedded in bores 26a of the slide 18a, which are supported on abutments 28a embedded in the switch cross 12a. The carrier 8a has a cover 29a with a flat end face Fa and openings 31a for the bending mandrels Ia ... IVa. The guide channel K is thus delimited by the plane-parallel end faces Fa and Fb of the covers 29a and 29b of the supports 8a and 8b, respectively.

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Stw.ϊ Create wire comb binding-Bending Chamber-I Nuertingen, November 11, 1981 - Womako file 669

In the housing 4a or in a bushing 30a flanged to it, a shaft 34a which can be driven by a drive (not shown) is mounted in a uniform rotational movement by means of ball bearings 32a, 33a and which has a two-armed switching lever 36a belonging to the indexing gear 14a, on which the guide grooves 13a of the switching cross 12a engaging switching rollers 37a are mounted. 38a designates a locking curve which interacts with corresponding, not shown, locking curve sections on the switching cross 12a and fixes them when none of the switching rollers 37a is in engagement with one of the guide grooves 13a (the axes of rotation 2a and 3a and those around them appear due to the angled section revolving parts in Figure 2 not in their actual assignment but with an enlarged distance). The carriers 8a and 8b can also be driven by electric stepper motors or electrically controlled hydraulic motors for successive rotary movements of 90 ° each. A control cam 39a is fastened on the shaft 34a by means of a clamping ring 40a screwed onto the latter. The control cam 39a actuates a holding means in the form of a lever 41a which protrudes into the guide channel K (see FIG. 1). The lever 41a is clamped to a shaft 42a mounted at one end in the housing 4a. At the other end of the shaft 42a a lever 43a is clamped, which carries a control roller 44a rolling on the control cam 39a, the latter being pressed against the former by a compression spring 47a supported on a bracket 46a attached to the housing 4a and acting on the lever 43a. To cover the last-mentioned parts, a cover 48a is screwed onto the relevant side of the housing 4a.
The lever 41a points at its into the guide channel K

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Stw .: create wire comb binding ~ bending chamber-I Nürtingen, November 11, 1981 - Womako file 6S9

The protruding end has a holding hook 48, whereas the lever 41b has only one holding surface 49 at the end in question having.

Fixed guides in the form of rails 45 »50 protrude into the guide channel K with the wire comb DK.

D - »'e two assemblies 1a and Ib are in such a way to one another arranged or in a wire comb DK weiterverar conductive Machine integrated that the axes of rotation 2a, 3a and 2b, 3b run parallel to each other and the axes of rotation 2a and 2b one of the size of the wire channel to be bent DK or, depending on the length of the tines Z, have a distance perpendicular to its conveying direction, that is, the carriers 8a and 8b are arranged correspondingly eccentrically to one another.

The wire guide 51 according to FIG. 4 is arranged upstream of the assemblies 1a and 1b. This is as a wire straightening device formed and consists of two, one behind the other arranged groups 52, 53 of the wire D to be bent between them leading roles 54, which in the inren circumferential surfaces each have a guide groove 56. The groups 52, 53 are arranged in planes perpendicular to one another, wherein the axes 57 of the rollers 54 facing the guide channel K between the assemblies 1a and 1b (Figure 1) Group 53 run perpendicular to the guide channel K.

The rollers 54 of group 52 are on one on a machine frame 58 mounted bracket 59 mounted. The rollers 54 of the group 53 are on a common holder in Mounted in the form of a plate 61 which is mounted pivotably about an axis 62 on the machine frame 58. One at the

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I Stw .: create wire comb binding-bending chamber-I

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Nuertingen, November 11, 1981 - Womako file 669

Plate 61 mounted control roller 63 interacts with a continuously rotating control cam 64, which is designed in this way det or «, to the shafts 34a and 34b of the assemblies 1a and | 1b can be driven in such a way that with one revolution of the |

Waves 34a and 34b up and down the plate 61 twice

is pivoted, i.e. the group 53 of the rollers 54 takes part in the movement of the wire D, which this according to FIGS. 3a up to 3h is imposed by the bending mandrel Ia ... IVa and Ib ... IVb.

Mode of operation of the device: The indexing gears 14a and (14b) are connected to a common drive in such a way that that they drive the carriers 8a and 8b in opposite directions and out of phase, d. h «during one When the carrier 8a is idle, the carrier 8b performs a rotary movement of 90 ° clockwise, and during one When the carrier 8b is idle, the carrier 8a rotates 90 ° counterclockwise. While of the rotational movement steps of the carriers 8a and 8b, the control rollers 21a and (21b) roll on the control cams 23a or (23b) and move the slide 18a or 18b. As a result, the arranged on the slides 18a and 18b are Bending mandrel Ia ... IVa or Ib ... IVb successively for bending the wire D into the guide channel K moved in and out again after bending. The projecting into the guide channel K in each case Bending mandrels Ia ... IVa and Ib ... IVb are shown in FIGS. 3a ... 3h, as already stated, blackened over the control cams 39a, 39b become the levers 41a and 41b>

moved up and down in such a way that it appears in the figures 3a ... 3h of the apparent type with their holding hooks 48 or their holding surface 49 with the bending mandrels Ib ... IVb or Ia ... IVa cooperate. As already explained,

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Stw .: create wire comb binding- »bending chamber-I Nuertingen, November 11, 1981 - Womako file 669

the group 53 of rollers 54 follows the wire guide 51 in a controlled manner the up and down movement of the wire D.

Figure 3a shows the position of the mandrels Ia ... IVa, Ib ... IVb and the lever 41a, 41b immediately before the Carrier 8a begins to rotate. The lever 41b has been pivoted downward so that its holding surface 49 no longer praises wire section A to bending mandrel Ha. In the previous bending step of the bending mandrel Hb the wire D has been brought into contact with the bending mandrel Ia. The wire D is on the bending mandrel Hb from the lever 41a held with its holding hook 48. (The roles the wire guide 51 provide the necessary for bending Tensile stress in wire D).

Figure 3b shows the beginning of the bending process by the Bending mandrel la. It can also be seen that the bending mandrel Ha has been withdrawn from its working position at the beginning of the rotary movement of the carrier 8a.

Figure 3c shows the end of the rotary movement of the carrier 8a, in which the bending mandrel Ia has bent the wire D into a hairpin-shaped prong Z around the bending mandrel Hb. i> he Lever 41b is pivoted upwards so that its holding surface 49 presses the wire D against the bending mandrel Ia.

Figure 3d shows the beginning of a subsequent rotary movement of the carrier 8b. The lever 41a is pivoted upwards so that its retaining hook 48 paves the way for the movement of the bending mandrel Hb releases. The bending mandrel Hb initially remains in its working position, so that it is the according to Figure 3c

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Stw .: create wire comb binding-bending chamber-I Nuertingen, November 11, 1981 - Womako file 669

The last formed and slightly inclined wire prongs Z are straightened.

In Figure 3e, the last-described operation has just been reached, the lever 41a is pivoted down again, and the bending mandrel Ib has come into contact with the wire D.

Figure 3f shows the subsequent state in which the bending mandrel Hb after straightening the last bent prong Z is withdrawn from its working position.

FIG. 3g shows the device shortly before the end of the considered bending step of the carrier 8b _f and FIG. 3h shows the end of the rotary movement of the carrier 8b. The bending mandrel Tb presses the wire D against the holding hook 48 of the lever 41a, the wire D is in contact with the bending mandrel IVa, and a new section A of the wire comb DK is formed. It can be seen from FIGS. 3c, 3d and 3h that the wire D is initially bent over, that is to say it is offered to a greater extent than its desired shape appears to be necessary. Due to its elasticity, the wire springs back a little after being released at the bending points. Overbending the wire eliminates the need for otherwise usual stretching of the wire over the bending mandrels or post-shaping with an additional device in order to obtain the final shape of the wire comb.

The successive bending steps of the mandrels Ia, Ib, IVa, IVb, IHa, IHb, Ha, Hb, etc. promote the educated Wire comb DK out of the guide channel K addition, being guided by the stationary rails 45 and 50 and this is kept calm.

Womako

Machine constructions GmbH

Schlosserstrabe 15 7440 Nürtingen, November 11, 1981

Stw .: Establish wire canal connection-bending chamber-I Womako-Ak ta 669

Z usamm en _f_a s__s u_n_g

Device for loop-shaped bending of a continuous wire

The invention relates to the manufacture of a wire comb (DX) as used to wire-bond blocks of paper.

Opposite and offset from one another are two alternating steps around parallel axes (2a, 2b) circumferential supports (8a, 8b) with bending mandrels (la. *. IVa, Ib ... IVb) arranged. The carriers (8a, 8b) delimit a guide channel (K) for the wire (D) between them. the Bending mandrels are pushed forward one after the other to Piegen the wire so that they protrude into the guide channel and take the wire with you and bend it, and then pull it back after bending.

(Figure 1)

Claims (1)

Stw .: create wire comb binding-bending chamber-I Nürtingen, November 11, 1981 - Womako file 669 ■ J ■ t% nsprüche 1. Device for loop-shaped bending of a continuous wire, in particular for the production of a wire comb, the prongs of which consist of hairpin-shaped, closely spaced wire sections which are connected by wire sections arranged one behind the other and extending in the longitudinal direction of the wire comb, characterized in that two about axes (2a , 2b) rotatable supports (8a, 8b), on their facing end faces (Fa, Pb) with the same distance from the axis of rotation of the respective Träjsrs and with the same distance from each other bending mandrels (la .. _: IVa, Ib ... IVb) are arranged eccentrically and axially spaced from one another in such a way that they partially overlap and limit a guide channel (K) for bending the wire (D), that the two carriers can be driven alternately one after the other in opposite directions, and that Means are provided for removing the wire loops (Z) from the bending mandrels. 2. Device according to claim 1, characterized in that that the axes (2a, 2b) of the two carriers (8a, 8b) run parallel » 3. Device according to claim 1 and / or 2, characterized in that that the mutually facing end faces (Fa, Fb) of the carrier (8a, 8b) at least in the of the Flexural mandrels (la,., IVa, Ib ... ivb) limited areas are plane-parallel. Stw .: create wire comb binding-bending chamber-I Nuertingen, November 11, 1981 - Womako file 669 4. Device according to one or more of the preceding claims, characterized in that the bending mandrels (la ... IVa, Ib ... IVb) are movably mounted on the carriers (8a, 8b), and that control means (23a) for the bending mandrels are provided, which move out the Piegedorne respectively after bending of the wire (D) from a working position, they project into the into the guide channel (K), to the said guide channel and before re-bend the wire, move back to the working position « 5. Device according to one or more of the preceding claims, characterized in that controllable with the bending mandrels (la ... IVa, Ib ... IVb) interacting Holding means (41a, 41b) are provided which hold the wire in each down time following a bending step hold on to the respective bending mandrel. 6. Apparatus according to claim 5, characterized in that the holding means as to the axes (2a, 2b) of the Carrier (8a, 8b) parallel axes (42a, 42b) pivotable levers (41a, 41b) are formed. 7. The device according to claim 1, characterized in that in the guide channel (K) the bent wire (wire comb DK) conductive, fixed guides (45, 50) protrude so that the wire after bending and removal of the bending mandrel (la ... IVa, Ib ... Ib) is guided on all sides, 8. Apparatus according to claim 1, characterized in that each carrier (8a, 8b) has a separate indexing gear (14a, 14b) is assigned. Stw .: create wire comb binding-bending chamber-I Nuertingen, November 11, 1981 - Womako file 669 9 · Device according to claim 5 and / or 6, characterized in that the holding means (41a, 41b) of continuously revolving control cams (39a, 39b) can be actuated. ^ 10. The device according to claim 1, characterized in, | that the bending mandrels (la ... IVa, Ib ... IVb) parallel to | the axes (2a, 2b) of the carrier (8a, 8b) sold in these 'j are mounted slidably. 11. The device according to claim 10, characterized in that the bending mandrels (la ... IVa, Ib ... IVb) are displaceable by means of fixed control cams (23a, 23b). 12. The device according to one or more of the preceding claims, characterized in that the guide channel (K) is arranged upstream of a wire guide (51) which in a plane aligned with the guide channel corresponding to that caused by the bending mandrels (la ... IVa, Ib ... IVb) Movement of the wire (D) is controllable. 13. The device according to claim 12, characterized in that that the wire guide (51) is designed as a wire straightening device. 14. The device according to claim 13 »characterized in that that the wire unit (5I) consists of two groups (52,53) of the wire (D) in each case leading between them (54) consists, and that the groups one behind the other and in are arranged perpendicular to each other planes. Deputy: create wire comb binding-bending chamber-I NÜrtingen, November 11, 1981 - Womako file 669 15. The device according to claim 14, characterized in that that the axes (57) of the group (53) of rollers (54) facing the guide channel (K) run perpendicular to the guide channel. 16. The device according to claim 14 and / or 15, characterized in that the guide channel (E) facing Group (53) rollers (54) is mounted on a common holder (61) which is perpendicular to the guide channel around a standing axis (62) is pivotable.