DE2254877A1 - BENDING MACHINE FOR WIRE OR STRIP-SHAPED MATERIAL - Google Patents

Description

Patent attorney *

Dr. rer.nat W. KÖRBER Dipl.-Inß. J- SCHHIDT-EVERS t M & NCKN 22. StfnitaWr. W.

EVG Entwicklungs- u.V rwerttmgsge Seilschaft mbH , abc Graz (Styria, Austria), Vlnzenz-Muchltseh-Straße 36

Patent application

Bending machine for wire or ribbon material

The invention relates to a bending machine for wire or strip-shaped material, in which the material to be bent
is advanced intermittently by a distance which corresponds to the desired distance between two successive bending points and in which a bending jaw, which is fixed during the bending process, is located at the bending point
and a driven bending tool that can be moved around this while bending the respectively advanced piece of material
are located whose travel is preferably adjustable. Such bending machines are required in particular for the production of brackets for reinforced concrete construction.

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The known bending machines of the type specified in the introduction can only bring about bending processes in the same direction, i.e. it is not possible to touch the material to be bent one bend in one direction and at the next bend in the opposite direction. This frequently occurring task could now be solved in such a way that on the bending machine on opposite sides Two fixed bending jaws are arranged on the sides of the material feed path, and each bending jaw has a movable one Bending tool is assigned. With such a design, however, it would be a considerable constructive one Require effort to move the drive system alternately with one or the other as required Coupling the bending tool when changing the bending direction is desirable.

The present invention avoids these difficulties and provides a bending machine that does not require the the alternating connection of two movable bending tools with the drive system, optionally bending processes for opposite seals from the material feed path made possible by a flexible bending tool common to both bending directions according to the invention is provided that is displaceable perpendicular to the bending plane and thereby on a lateral bypass path from a position on one side of this path can be converted into a position on the opposite side of the same. "The movable bending tool remains permanently connected to the drive system and the change of the bending direction is easy by moving. Exchange of working and return stroke in the reciprocating drive causes.

In a preferred embodiment of the invention Fixed bending jaws are provided on opposite sides of the material feed path and the bending tool is

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optionally movable around one of the two bending devices »Babel can use the comfortable bending tool. a drivable reciprocating working movement arm be attached · whose geometric Söhwenkäöh's © s ^ yiaiaetiaBdi 'to the two fixed Biegebaeken the Mäte3? ialv © r £ ehubbahn cuts "The arm of the bending% ■ & term can then on an axially shiftable The hollow shaft must be attached * by the axial shift of which the bending tool can change its position from one side to the opposite side of the material feed path * and, in this hollow shaft, an ejector mandrel can be arranged in an axially displaceable manner independently of it, with which a finished bent bracket or the like can be removed from the machine »

In another embodiment of the invention, in addition to the bending tool common for both bending directions, a bending jaw is also provided for both bending directions, which is also perpendicular '2ua? Bending plane ver *. slidable and thus on a lateral bypass path from a position on one side of the material feed path to a position on the other side of the same can be transferred The ideal axis that cuts the material feed path can be swiveled \ in order to be able to interchange the positions of the bending jaw and the bending tool with regard to the material feed path ^ and can also be swiveled around the bending jaw in order to enable the bending tool to work around the bending jaw

Embodiments of the invention are now referred to explained in more detail on the drawings *

Fig * ΐ is a schematic of a stirrup bending machine according to the invention \ '' '

_ H- _
1a shows a variant of a detail;

Figure 2 is a modified side view of the adjustable Drive system of the machine according to FIG. 1, with v / elcher the individual parts of the drive system compared to the i'ig. 1 recognizable actual situation in Direction of the arrow P are shifted in such a way that all Individual parts are clearly recognizable without overlapping one another;

Fig. 3 explains the axial displacement of the movable Bending tool and ejector mandrel;

Fig. 4- shows a modified drive system and

FIG. 5 is a modified one corresponding to FIG Side view of the drive system according to FIG. 4;

6 and 7 explain basic possible embodiments of the invention and

FIG. 8 finally shows schematically an embodiment following the principle according to FIG. 7.

According to FIG. 1, the wire 1 to be ironed is moved by means of two pairs of transport rollers 2, 2a and 3 »3a» which grasp the wire with frictional engagement, conveyed through the machine.

The transport rollers are driven by an electric motor 4, the or the like via a V-belt 5. a flywheel 6 drives. The flywheel 6 can rotate with a gear 7 by means of a coupling (not shown) are connected, which in turn is in permanent engagement with a gear 8.

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One seated on the same shaft as the gear wheel 8 .Kettenrad 9 is with an endless chain 10 in .Eingriff, which by a tension roller 11 under constant Tension is maintained. The endless chain 10 is partially wrapped around sprockets that are non-rotatable are connected to the transport rollers 2, 2a and 3, 3a ", out, whereby the transport rollers can be driven by the electric motor 4.

As soon as the coupling, not shown, connects the flywheel 6 in a rotationally fixed manner to the gear wheel 7, the wire is advanced. The feed movement is continued until the desired length of wire is fed in, then the non-rotatable connection between the flywheel 6 and the gear wheel 7 is interrupted by the automatic release of the clutch and at the same time the gear wheel η is braked by a brake (not shown) and its momentary Location held.

The two transport rollers 2, 2a are perpendicular within limits Sighting is designed to be displaceable and by springs, not shown, in the direction of the below the wire running through them is loaded, the magnitude of the pressure exerted by the springs being controlled by adjusting screws 12, 13 is changeable »

The one advanced by the pairs of transport rollers 2, 2a and 3, 3a Wire 1 runs through a skin pass device 14 of known construction behind the transport rollers, in which he is straightened. Subsequent to "the skin-pass device 14 is a friction roller 15 which rotates around an axis is pivotably mounted and is pressed by a spring against the wire 1, is provided. The friction roller 15 is used for driving a pulse generator for an electronic length measuring device in the patent (application

P 21 62 568.3) described type with which

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the advancement of the wire and the severing desired Sections of this can be controlled automatically by means of scissors.

After going through the scissors, which consist of a fixed Knife 17 and a movable knife 18 is made the wire into the actual bending device, the main components of which are two fixed bending jaws 19, 19a and a movable bending tool 20 are.

The drive of the bending device is carried out by an electric motor 21, which by means of a V-belt 22 or the like. a flywheel 23 drives. The flywheel 23 can rotatably with by means of a coupling, not shown a gear 24 are connected.

The gear 24 is in permanent engagement with a gear 25. On the shaft of the gear 25 is a non-rotatable eccentric 26 connected to this is arranged. The eccentric 26 is via a connecting rod 27 with a push rod 29 and a link 29 in connection, which at 37 are articulated with one another and with the connecting rod 27 are.

As FIG. 2 clearly shows, another one-armed lever 30, which serves as an actuating arm, rests in a fixed one Bearing 31, with its free end by means of an adjusting spindle 32 can be pivoted about the bearing 31. The handlebar 29 is arigelenken at 33 on the actuator arm 30, while the push rod 28 at 34 on one arm one around a solid Bearing 36 pivotable two-armed angle lever 35 articulated is. The distance between the Anlerikpurikte 3 ^ and 37 der The push rod 28 is the same size as the distance between the articulation points 37 and 33 on the handlebar 29.

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With help of the lifting described! Systems it is möglieh ^1, the pivot angle, the angle lever 35 to continuously adjust "during a rotation" of the eccentric 26 to 180 between the value Hull and a structurally predetermined upper limit angle. "If the free end of the Btellarmes 30 is brought into such a position with the help of the adjusting spindle 32 that the articulation points 33 and 34- coincide, then when the eccentric 26 is rotated, the two parts 28 and 29 perform common pivoting movements around this Kcdnzidenzpunkt and no movement is transmitted to the angle lever 35.

However, if the actuating arm 30 with the aid of the adjusting spindle 32 around the bearing 31 in one other than the one previously described Pivoted position, then the link 29 now only performs a pivoting movement about the articulation point 33, wherein the distance between the articulation points 37 and 34- would change, if not the push rod 28 one would prevent such a change in distance by moving the pivot point s 34-. This is why this PaIl leads the angle lever 35 swivels about the bearing 36 the end. The pivoting movement of this two-armed Angle lever 35 then be greatest when the distance between the articulation points 33 and 34- with the aid of the adjusting spindle 32 is set to the maximum value specified by the design

A coupling rod 38 which is pivotable at the other end of the two-armed angle lever 35 and by means of a threaded spindle is hinged adjustable in the longitudinal direction, this end of the angle lever 35 connects to a gear 39 »which in turn meshes with a gear 40. This gear 40 is rigid with the bending tool 20 connected, which is therefore swiveled when this gear is turned »As soon as the angle1-

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lever 35 under the action of the eccentric 26 and the transmission elements 27 to J4 o ine ^ swiveling movement to be. Warehouse 36 "executes, this assessment is carried over over the coupling rod ;; »8 and the gears 39 and 4ü on the -iiegewerkzeug 20, da ", in turn a Sckwonkbevjogun ^. um sei no: ait dom gear 4u £; cmeinnai: ie /.chi;e executes.

The size of the "angle of the pivoting movement carried out before the bending tool 2ü from go depends on the position which the actuating ^{arm 7} U has been given with the aid of the actuating pin 3-2.

.jtellspindel;) 2 is therefore used for adjustment; of the desired bending angle, whereby it is at the same time possible to compensate for the different ^ 'e de!' constant η of wires of different quality. The one in the knoll list ar. ge ⁷ / ό provided threaded spindle is merely task liuhelage to precisely adjust the bending tool 20 so that the iiusgangslaj; s for opposing bending operations of the material feed path can be adjusted exactly symmetrical with respect to, regardless of the instantaneous position of the ütellspindel 32nd

The connection of the gear 40 with the bending tool 20 is effected by a hollow shaft 41 on which the two parts 20, 40 are fixed in a non-displaceable and non-rotatable manner are. The hollow shaft 41 is on a piston rod 42 with a piston 4 $, which in oinem hydraulic Cylinder 44 is guided back and forth movable, in connection, -oine coil spring 4-5 is supported with their one inde against oin abutment 46, which is immovable is connected to the hollow shaft 41, and with its other ^ nde against an abutment 47. Dps abutment 4 " in turn supports itself against the one in the machinon housing fixed bearings 48 of the hollow shaft 41 and. is by means of

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• a bolt 4-9, which is in longitudinal slots 50 of the hollow shaft 4-1 is guided displaceably, with "an ejector pin 51 displaceably mounted in the interior of the hollow shaft 41 tied together. An annular stop 52 which is firmly connected to the hollow shaft 4-1 and which, likewise against the bearing supports 4-8, limits the greatest possible expansion of the helical spring 4-5 and thus fixes the outermost position of the bending tool carried by the hollow shaft 4-1 20-,

According to i'ig. 3 an electric motor 53 drives an oil pump 5 ^ -

which oil with the interposition of a suction filter 55 is taken from an oil sump 56 and into the line 57 promotes. '

The pressure in line 57 is controlled by a pressure regulator. valve 58 always kept constant. Via an electro-hydraulic Slide 59 and two throttle valves 60 is it possible. To slacken the piston 4-3 so that it ever after setting the electro-hydraulic ^ η slide in seal of the arrow "a" or in that of the arrow "b" moves * ri_rd.

A large bracket, such as the one in E'ig. 1 dash-dotted lines; type shown in which all of the bends always in the same direction follower · ^1, are prepared, so the clutch is not shown, the Zahnrad.24-coupled to the flywheel 23 with iiilfe. This connection is maintained until the gear wheel 25 and (byp eccentric 26 attached to ui-ssem have made one full turn ( yhO ) yuijfjefjefjefjefjefjefjefjefjefj As soon as this has happened, the clutch is again. ;;; e and at the same time that Zahn- r-ü '\ PA by a brake, also not shown, ■ -) bt-; ebrer; urine is held in cieincii ¹ liuliela ^ e. During ^r ) nv ci-ßi; en! Ifil.ben rotation of the eccentric 26 is dem-.

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Bending tool 20 via the elements 27 to 41 a pivoting movement issued in ^ iegerrichtung, the desired bending angle being determined by setting the ötellspindel 32 will. The setting of this adjusting spindle can, as in i-'ig. 1, it can be done by hand but also, as in i'ig. 1a indicated, can be carried out with the aid of a dedicated adjusting motor 61. While the ζ v / ei te η half a revolution of the eccentric 26 is that Bending tool 20 returned to its original position.

If the bending direction is to be changed, for example from clockwise bending, as shown in FIG. 1, to bending counterclockwise, then the electrohydraulic slide 59 is set to the "direct passage" position brought, the piston 43 acted upon from the left and the cylinder 44 is connected to the oil sump 56 on its right side.

As a result of this loading, the piston 43 moves in the direction of the arrow "a" and pulls the hollow shaft 41, counter to the action of the helical spring 45, back. Since the abutment 46 connected to the hollow shaft 41 must follow the movement of the hollow shaft, the Sc Vi roben spring 45 is compressed during this movement. The bending tool 20 is brought into the position shown in phantom in FIGS. 2 and 3 by this movement, so it is disengaged from the wire 1 to be bent. The eccentric 26 is rotated by the electric motor 21 by half a revolution (180) . The bending tool 20 changes - out of engagement with the wire -; from its height above the to biegen'um J ran tos in a new rest position below the wire to be brewed.

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completion of turn-around 180 ° "the .Exzenter 26 is again feqtgeui * once and the erektrohydrauliscUe slider 59 is in its Ilittellage zurückgestellt.'In this situation, both halves of the cylinder are .4-4- with the ülsumpf 5.6 i * ¹ Ver_ bond The coil spring 4-5 can relax and, in the process, push the hollow shaft 4-1 sp far forward until the annular stop 52 comes to rest against the .bearing 4-8 'and thus prevents further expansion of the coil spring 4-5 The bending tool 20 is again in its working position, but now on the other side

of the wire to be bent,

as soon as all necessary bending steps have been carried out the scrap is done with the help of the two cutters 17, 18; The ochtieid mechanism works in the same way as the Wire feeder and the bending mechanism are powered. A .Elektromotor 62 drives a V-belt 63 Flywheel 64- which can be coupled to a wheel 65. A gear'66 which meshes with the gear 65 actuates the movable cutter 18 of the cutting device via the eccentric 67 and the eccentric rod 68,

Kach taken place Schnitt'wird the electro-hydraulic slider 59 ^a ^ f position "passage crosswise" connected, \ wirdj applied tfodurch the piston in the cylinder 4-3 4-4 so that it moves in the direction of the arrow "b". As a result, the ejector pin 51 is moved in the interior of the hollow shaft 4-1 in the same direction. The bolt 4-9, which is firmly connected to the ejection mandrel 5 ^, moves in the longitudinal slots ^ O 'of the hollow shaft 4-1, the abutment 4-7 being taken along and the helical spring 4-5 being compressed. The ejector mandrel pushes the finished bent bracket, which has been separated from the wire 1, out of the long slot between the bending jaws 19 and 19a. After the electrohydraulic slide 59 has been reset, the ejector pin returns to its rest position

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In the case of the invention shown in FIGS. 4 and 5, the movable bending tool 20 of driven by a piston 80 which is slidably guided in a cylinder 81 and through a pressure medium, preferably a liquid that is acted upon * The pressure medium can again be controlled by a slide and does not need to be described in more detail. A piston rod 82 is hinged at 83 to the gear 39, the as in the embodiment of FIGS. 1 to 3 with the Gear 40 is in engagement, which is rigidly connected to the bending tool 20. One with the gear 39 rigid connected stop 85 acts with adjustable stops 84, 84a to adjust the bending angle together. An automatic adjustment of the bending angle during operation is possible in this embodiment not provided. The possibility of such an adjustment is a particular advantage of the drive system according to FIGS. 1 to 3 to be assessed.

While the embodiments described so far the Follow the scheme shown in Fig. 6, in which on both Sides of the material feed path B fixed bending jaws 19, 19a are arranged and the movable bending tool on a path bypassing the web B laterally from the in Fig. 6 with 20 denoted position on one side of this path, in which it cooperates with the fixed bending jaw 19, in the position marked 20 'on the other Web side can be pivoted, in which it interacts with the fixed bending jaw 19a, can according to FIG. 7 for both bending directions a common bending jaw 19 and a common bending tool 20 are used, wherein When changing the bending direction, a change of place of both parts 19 »20 to the side bypassing the material feed path Because in Fig. 7 with 19 ', 20' designated positions must take place.

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An easy way to bring about the at The scheme of setting and working movements required according to FIG. 7 is shown schematically in FIG. Laterally the web B is guided by a rack 100 which is in engagement with a gear 101, on whose shaft 102 the roller-shaped bending jaw 19 is seated. The wave

102 is also connected to the bending tool via a swivel arm 103 20 connected. By means of one not shown Piston-cylinder system can move the shaft 102 from the position shown in full lines in FIG. 8 after axial displacement the parts 19 and 20 from the web B in vertical Direction along a guide 104 in the direction shown in FIG. 8 with ■ = The position shown in broken lines under the web B can be moved. The gear wheel 101 rolls on the held rack 100 from, whereby the swivel arm

103 is pivoted counterclockwise and brings the bending tool 20 into a position above the path B. By moving the rack 100 while holding the shaft 102 in the direction of the arrow P1 or P2, the wire advanced by the path B from the full Lines shown position of the bending tools upwards or from the position shown in broken lines the bending tools are "bent downwards".

Of course, numerous other embodiments for transmissions are also conceivable within the scope of the invention, which, a change of place of one or both bending tools enable.

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Claims (1)

- 14- claims: Bending machine for wire or strip-shaped material, in which the material to be bent is intermittent is advanced by a distance, which is the desired distance between two consecutive Corresponds to bending points, and in which a bending jaw, which is fixed during the bending process, is located at the bending point around this, while bending the respective advanced piece of material, the driven bending tool is movable, whose working path is preferably adjustable, characterized in that optionally bending processes according to opposite Directions from the material feed path (B) are made possible by a flexible bending tool 7 common to both bending directions, which is perpendicular displaceable to the bending plane and on a lateral bypass path from a position on one side of this Web can be converted into a position on the opposite side of the same. 2. Bending machine according to claim 1, characterized in that that on opposite sides of the material feed path (B) fixed bending jaws (19 »19a) are provided and that the bending tool (20) is optionally movable about one of the two bending jaws. 3. Bending machine according to claims 1 and 2, characterized characterized in that the movable bending tool (20) is attached to a swivel arm that can be driven with a reciprocating working movement, the geometric swivel axis of which is symmetrical to the two fixed bending jaws (19 » 19a) intersects the material feed path (B). 4-. Bending machine according to claim 3 »characterized in that that the pivot arm of the bending tool (20) on a -15-309843 / 0361 SAD ORIGINAL 225.4 * 77 axially displaceable. Hollow shaft (4- "I) - is fastened in • the ejector mandrel C50 is arranged to be axially displaceable independently of the hollow shaft ^. ' ^! 5. Bending machine according to claim. I ^ characterized in that a common for both bending directions bending ■ jaw (19) is provided, the perpendicular to the bending plane This means that they can be moved along a lateral connecting path from a position on one side of the material transport track. (B) can be converted into a position on the other side of the same. . . . · ■. ' 6. Bending machine according to claims Λ land 5, thereby. , characterized in that the bending jaw (19) and the bending tool (20) are mounted on a common swivel arm (103) which is pivotable about an ideal axis that cuts the material feed path, around the positions of the bending jaw and bending tool with respect to the material feed path to be able to swap, and. in addition 'can be pivoted about the bending jaw (19) in order to enable the bending tool (20) to be bent around the bending jaw. . The patent attorney 309843/0361 SAD ORSQiMAL Empty soap