A~aratu~ for bending rod-~haPed material to form concrete-reinforcement elements The invention relates to an apparatu~ for bending rod-shaped material to form concrete-reinforcement element~, having a frame for supporting a material feed device and having a bearer for bending member~, which bearer is mounted on the frame so a3 to be rotatable about the axis of feed and is ad~u table relative to the frame.
In an apparatus of this type, known from U.S.
Patent 4,782,684, the bearer for the bending members has a driven rotatable disc which is mounted on the frame 80 a~ to be rotatable in both directions about the axis of feed and i8 provided with a passage aperture for the rod-shaped material. Extending from the rotatable disc is an arm, which is provided with a slide guide which is penetrated by the material and is aligned with the rotatable di~c aperture. At its free end, the bearer bears a bending head which is fitted with bending mandrel~ which can be rotated or swivelled about an axis perpendicular to the guide. The known desiyn primarily has the disadvantage that bars with relatively large limb lengths cannot be effectively supported by the bearer arm and are at risk of becoming deformed under their own weight. On the other hand, due to the lack of adequate support, no pos~ibility i8 provided of counteracting or compensating for a spring-back tendency of the material during bending. Finally, in the known con~truction, a cutting-off device for the bent element is provided on a separate frame away from the bending head, which cutting-off device is complicated in construction and susceptible to fault~.
The ob~ect of the invention consists in avoiding the disadvantages described and providing an apparatus of th~ type speci~ied in the introduction which allows rod-shaped material to be bent ~atisfactorily in different bending plane~ and with any de~ired limb lengths and allow~ the bent elements to be cut off in a simple manner. At the same time, the invention i~ intended to 2~42025 allow the continuou~ bending of spatial reinforcements and so-called ba~ket binders. The apparatus according to the invention is distinguished by the fact that the bearer i8 constructed a8 a material supporting table which is ad~ustable in a prede~ermined angular position relative to the frame, on which material supporting table a cutting device is provided upstream of the bending members in the material feed direction for c~tting off the rod-shaped material from the line of material after the bending operation.
The invention advantageously provides an ad~ustable supporting surface ~sr the bent reinforcement elements which guarantees satisfactory forming of the elements without the risk of deformation, it being possible for the elements to be cut off reliably without qreat constructional expenditure and without delay.
In accordance with a preferred exemplary embodiment of the invention, a strip i~ provided on the supporting table with clearance from the bending members for providing electrical contact with the bent material, Vi8 which ~trip the rotational movement of the table can be controlled. By this means, in the case of the bent element being unintentionally lifted up from the supporting table, read~ustment of the supporting table into renewQd contact with the element is achieved.
According to a further feature of the invention, a receptacle i~ provided below the supporting table for reinforcement elements dropping downwards when the supporting table i8 in the horizontal position, the receptacle preferably being rotatable.
Furthermore, the rotary bearing of the supporting table is preferably constructed as a tubular guide, coaxial with the axis of feed, for the rod-shaped material.
The invention i~ described in greater detail below by way of an exemplary embodiment with reference to the drawings, in whichs Figure 1 shows a diagrammatic perspective view of a bending apparatus in accordance with the invention, and _ 3 _ 20~202~
Figures 2a - 2c show the bending apparatus according to the invention with different arrangements of the supporting t~ble defining the bending plane relative to the material feed plane.
In accordance with Figure 1, rod material to be bent is fed to the bending apparatus in the direction of the arrow Pl from a material stock (not illu~trated) via a straightening device (likewise not illustrated) and forwarded along an axis of feed X-X.
The bending apparatus consists essentially of two parts 1 and 2, part 1 being arranged in a stationary manner and part 2 being connected to part 1 80 as to be rotatable about an axis of rotation which coincides with the axis of feed X-X and correspond~ to the double arrow P2. The part 1 consi~ts of a stationary frame 3 which bears a set 4 of feed rollers, an additional set 5 of straightening rollers arranged downstream of the set 4 of feed rollers, for compensating any deformation3 of the rod material by the feed rollers, and a rotary drive 6 for the part 2 which, is fastened 80 as to be rotatable on the part 1 by means of a bearing 7.
The part 2 consists essentially of a supporting table lO which bears a cutting device 8 and a bending haad 9.
A ~easurement wheel 11 is expediently integrated in the set 4 of feed rollers, via which measurement wheel the lenqth of the rod material passing through is recorded and the cutting device 8 i8 actuated, after the predetermined length of the material to be bent ha~ been reached, in order to cut off the fini~hed bar from the line of material by said cutting device. It is additionally po~sible within the fra~ework of the invention to arrange a measurement wheel, provided with a corresponding counter-roller, on the supporting table 10 directly upstream of the cutting device 8.
In order to avoid ~oiling, the set 4 of feed roller~ and the set 5 of straightening rollers are covered b~ a covaring hood 12 which can be removed for the purpose of servicing.
20~2025 The rotary drive 6 for the ~upporting table 10 i~
constructed in a known manner. A drive worm 6~ is indicated diagrammatically only by way of example. The bearing 7 of the supporting table 10 is provided with a longitudinal bore 13 coaxial with the axi~ of feed X-X
in order to allow unhindered pasQage of the rod material to be bent from the set 5 of Ytraightening rollers to the bending head 9.
The cutting device 8 i8 likewise constructed in a known manner and is situated Lmmediately upstream of the bending head 9, in order also to enable extremely ~hort end limbs of the bar~ to be produced. Due to the arrangement of the cutting device 8 on the rotatable supporting table 10 and in the axis of feed X-X, the lS cutting device 8 can rapidly cut off the finished bar from the line of matarial without additional expenditure on po~itioning.
The bending head 9 has a bending-head plate 14 which is movable in a guide 9' and on which there are arranged a stationary bending mandrel lS and a bending bolt 16 which i8 swivellable for bending the rod. Bending tools of different construction can also be used within the framework of the invention.
The supporting table 10 has a table surface 10' which is at lea~t as large as the surface bounded by the contour of the bars to be produced and defines the bending plane. In all positions of the supporting table with the table surface 10' facing upwards, the supporting table supports the bars during the bending operation. In the case of particularly large bar3, the support$ng table 10, together with the frame 3, forms a support for the bars. Additionally arranged on the supporting table 10 with clearance from the bending head is a two-part contact strip 17 which i~ only illustrated diagrammatically and which controls the rotational movement of the supporting table 10 and thus the three-dimensional po~ition of the bending plana when electrical contact is made with to the element to be produced, specifically even during bending, in order to read~ust -- 20~202~
the table surface 10~ of the supporting table 10, for example when the element deviate~ from the bending plane, into renewed contact with the element and thus to guarantee the production of flat bars.
Figures 2a - 2c illustrate various relative positions of the supporting table 10 and thus of the bending plane in relation to the feed plane which i8 defined by ths arrangement of the set 4 of feed roll2rs and the set S of straightening roller~ with the stationary frame 3 and is unalterable. The bending machine illustrated in Figure 1 shows a coincidence of bending plane and feed plane which is to be considered as the basic setting.
Figure 2a shows only a small deviation between the bending plane and the feed plane, which cau~es an intentional overcompen~ation in the bending and a counter-deformation of the rod material, for example in the production of crossed bars, as a result of the oblique position of the table surface, and thus prevents an undesired spreading of the bar limbs in the finished bar.
In Figure 2c, the supporting table 10 is rotated out of the basic position in accordance with Figure 1 to the extent that the supporting table 10 is almo~t horizontal with the table surface facing downwards. Since the bending tools 15, 16 face downward~ in this position, it i~ possible to allow bar B, for example, to drop without an additional catching device in the vertical direction P3 onto a resting devic~ 18 constructed, for example, as a turntable. The turntable 18 is rotatabl~
correspondinq to the double arrow P~, in order to allow orderly stacking of the bars B.
In the position of the supporting table 10 illustrated in Figure 2c, it is additionally po~sible to produce ~patial reinforcem~nts and basket bindars in a continuous operating process. In this case, it i~ al80 expedient to match the turntable 18 in its rotational movement corresponding to the double arrow P4 to the bending operation.
It is understood that the invention is not restricted to the exemplary embocliment~ illustrated; on the contrary, these can be modified in various ways within the framework of the general concept of the S invention.