DE2926905A1 - UNIVERSAL MACHINE TOOL - Google Patents

Description

" ⁴ " 2326905

Universal machine tool

The invention relates to improvements in a universal bending machine.

More particularly, the invention relates to a metal strip or wire bending machine having means for continuously Feeding the raw material to a straightening device from rollers, one of which is the metal strip or Wire into a deep drawing press and after leaving it the bent workpiece arrives at a processing station in which a series of circularly distributed on a plate Carrying carriages are provided that carry tools that carry out the most varied of machining operations on the workpiece such as bending, pressing in, rolling in, soldering, etc. The workpieces produced are e.g. clamps, brackets, Clips, buckles, lamp sockets, electrical clamps, Handles, tools for archiving documents, key rings, etc., i.e. small metal parts for a wide variety of items Use Cases.

Known machines for the named tasks are common constructed in such a way that the press and the bending device are each arranged in a stationary manner and form an indivisible block form. Therefore, in these machines, the centers of press and bending device cannot be spaced from one another to be changed. It is therefore very difficult to adapt this machine to the most diverse applications because it is necessary in many cases to change this distance, depending on the curvature to be generated on the workpiece.

According to the present invention, this disadvantage is eliminated in that it is left stationary in the machine frame Press the bending device is guided displaceably in the machine frame without affecting the position or the synchronism of the different shafts of the machine can be changed.

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On the other hand, in the known bending machines, the slides carrying the tools are located on the necessary ones Positions on a plate on which they are attached, the plate having a plurality of circumferentially distributed Has bores with which the axes of the slide must be aligned so that they can be screwed to the plate can. It is therefore impossible to arrange the carriage in any angular distribution on the plate, since is determined by the distribution of the holes.

This disadvantage is avoided according to the present invention in that a Annular gap is arranged, which forms a guide for the carriage, which in this way in any position, depending on the requirements of the individual case, can be arranged. In the selected position, the slide can be releasably fixed again.

Another aspect of known bending machines of the type mentioned is that it is necessary for the carriage Provide different leverage to meet the respective workpiece shapes to be produced. This makes it more expensive generally the manufacturing costs.

According to the invention, this disadvantage is eliminated in that the angular position of the lever is adjusted in such a way that a synchronization of the tool movement according to the Requirements of the individual case is achieved.

The invention is to be described in more detail below with reference to an exemplary embodiment shown in the drawings explained. It shows:

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1 is a perspective view of a bending machine with the features of the invention;

Figure 2 is a schematic front view of the machine of Figure 1;

Fig. 3 is a partial front view of the machine;

Fig. 4 is a schematic partial view of the machine, from which the angular adjustment of the Tools are clear;

Fig. 5 shows the transmission elements between the press and the bending unit;

FIG. 6 shows a section through the arrangement according to FIG. 5 along the cutting line shown; FIG.

7 shows in detail a section through the device for setting and actuating the actuating lever in the slide carrying the tools, and

Fig. 8 in plan view, partially in section, a locking and fine adjustment ring on the device according to FIG. 7.

According to the drawings, the universal bending machine provided with the invention consists of a coil-fitted one Raw material carrier (not shown) of the usual type, which is a strip-shaped or wire-shaped metallic raw material Roll straightening device 1 feeds, from which the straightened raw material arrives at a conventional feed device 2, from which the raw material of a conventional eccentric press

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is fed, which is arranged in a machine frame 4, in which the drive motor 5 is also housed, which drives the press 3 via a suitable gear.

In the machine frame 4 there is also a guide device on which, by means of a crank 6 ' provided spindle 6 is movable, a bending device is displaceably guided. By means of the spindle 6, the distance of the Bending device for the press 3 can be adjusted to accommodate the different radii of curvature of the objects to be produced To take into account.

The machine contains a drive consisting of a first arm 7 and a two-part second arm 8, 8 ", whose Links 8 and 8 'can be shifted against each other to the length of the second arm for the purpose of tensioning an endless Chain 9 to be able to change. One arm link 8 'is mounted on the press. On shaft 10 of the press is a Sprocket 12 attached, which is wrapped by the chain 9. This chain 9 wraps around another sprocket 13 that is attached to the other arm link 8 is mounted. In the axis 11 of this second chain wheel 13, the other arm 7 is pivotable stored. Rotatably connected to the second sprocket 13 is a third sprocket 14, which is endless by a second Chain 15 is looped, which continues to loop around a fourth sprocket 16, which is on one at the other end of the Arm 7 located shaft 17 of the bending device is attached. A gear is attached to shaft 17 (not shown) .

The bending device includes a frame 18 with a circular opening 19 in the middle, in which a plate 20 is arranged such that the opening 19 of the frame 18 and the plate 20 together form an annular gap 21

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form, which is a guide for segments 22, which in turn carry slides 23 to which various tools (not shown) can be attached, with the help of which the metal strips or wires are processed, eg bent, pressed in, soldered. The circumference of the plate 9 is provided with a ^{scale ranging from 0 0} to 360 °, which aids in setting the angular positions of the various segments 22. In its rear area, the plate has a toothed ring in which the toothed wheel attached to the shaft 17 meshes (FIG. 1).

The machine is provided with a device for angular adjustment of two levers 24 and 25, of which the first lever 24 is provided to advance the tool and the second lever 25 is provided to the tool in the Return to readiness. These levers are located at the end of each individual bending device and are used for coupling the cams that move the bending device. The levers 24, 25 are connected to a carrier 27 via bolts 26 connected, which is provided with a conical recess in which a conical pin 28 of a shaft 29 rotatable is added, which is mounted in ball bearings 30. On the shaft 29, a gear is attached, which in a another gear meshes, with the help of which the levers 24, 25 are pivotable. The conical pin 28 has on his Area of larger diameter has a toothing 31 running in the axial direction on the circumference. There is also a ring 32 is provided, which has an internal toothing 33 that matches the external toothing 31 on the cone, with the help of which it engages the cone can be determined so that the levers 24, 25 assume an angular position that is approximately appropriate for the respective application with respect to the ring 32. In the Ring 32 immerse approximately tangentially two screws 34 and 35, between which a pin 36 is located on the Lever bracket 27 is attached. By adjusting the

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screw depth of the two pins 34 and 35 in one or Another sense can be an angular rotation of the lever carrier 27 and the lever assigned to it relative to the Cause ring 32, with which the angular position of the lever in any position within the the teeth on ring 32 and cone 28 can be finely adjusted predetermined pitch. For mounting the levers on the cone 2 8 a bore 37 is formed in the lever carrier 27, through which a threaded pin 38 fastened in the cone 28 protrudes. A nut 39, which holds the cone 28 and lever carrier 27 together, is screwed onto this.

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Claims (4)

Expectations 1.! Universal machine tool, especially metal bending machine, with a feed device that continuously feeds a strip or wire-shaped metal via a straightening device Eccentric press feeds, from which the raw material arrives at a bending device that consists of a plurality there is circularly distributed individual bending devices that each carry tools guided on slides that are movable against the raw material by cam-operated levers, characterized in that the press (3) in one Machine frame (4) is fixedly arranged, in which a guide is formed, along which the bending device by means of a spindle drive (6) for the purpose of changing the distance to the press (3) is displaceable that the bending device consists of a frame (18) which has a circular opening (19) in the middle, in which a round plate (20) is arranged which, together with the edge of the opening (19), forms an annular gap (21) forms, which forms a guide for support segments (22), on each of which a tool-carrying slide (23) is attached that the carriage (23) on the plate (20) 909884/0727 MUNICH: TELEPHONE (Οββ) 23888S CABLE: PROPINDUS TELEX O5 24244 BERLIN: TELEPHONE (O3O) Θ312Ο88 CABLE: PROPINDUS TELEX OI 84Ο67 -2- 2326905 can be set up in any angular position depending on the processing of the raw material to be carried out that the Plate (20) is provided with a graduation scale ranging from 0 ° to 360 °, and that the tools moving Levers (24, 25) are attached to a carrier (27), with the help of which the angular position of the levers (24, 25) according to the purpose of the tool being operated is adjustable. 2. Machine according to claim 1, characterized in that the lever (24, 25) holding the carrier (27) the tool leading (24) and the tool returning lever (25) on a flange ring by means of screws or Bolt (26) carries, the carrier (27) has a conical recess into which a conical pin (2 8) with External toothing (31) is used in the outer end region, which is via a shaft (29) of a drive gear for the purpose Rotation of the lever (24, 25) is rotatable that the pin (28) on the carrier (27) by means of a through a Bore (37) in the support (27) projecting threaded pin (38), onto which a nut (39) is screwed, is attached, and that a ring (32) with internal teeth is placed on the toothed area (31) of the pin (28), in the two adjusting screws (34, 35) are screwed in tangentially, which act on a pin (36) which is parallel to the Axis of the pin (28) projects away from the carrier (27) and with the help of which the angular position of the levers (24, 25) opposite the shaft (29) is finely adjustable. 3. Machine according to claim 1 or 2, characterized in that between the press (3) and the bending device a movable drive connection (7; 8, 8 '), which allows the centers without separating the operative connection of press and bending device to change, and that these 909884/0727 Drive connection comprises two articulated arms (7; 8, 8 '), one of which (7) is mounted on the bending device and the other (8, 8') is mounted on the press (3), and that in the bearing axles there are gears (12 , 16) are mounted, which are connected to drive (10) ^and output shafts (17), and around which endless chains (9, 12) are looped, which are also connected to the joint joint of the two arms (7; 8, 8 ' ) mounted chain wheels (13, 14) are looped. 4. Machine according to claim 3, characterized in that one of the arms consists of two longitudinally adjustable members (8, 8 '). 909884/0727