DE9100153U1 - Drive device for a punching/bending tool unit - Google Patents

Description

Drive device for a punching/bending tool unit

The invention relates to a low-maintenance drive device for a punching/bending tool unit with a cam-controlled tool slide, according to the preamble of claim 1.

Punching/bending tool units regularly work with a large number of cam-controlled tool slides, the drive pinions of which are preferably centrally driven. In order to allow the individual tools to work in a precisely coordinated manner, the drive is via cam disks, the contour of which is designed to match the respective, required movement pattern. The cam disks work together with a pressure and a tension roller, so that the slide is positively controlled in both directions, i.e. both for executing the working stroke and for executing the tool return stroke.

Conventional drive devices are designed in such a way that both the working stroke and the return stroke take place with the interposition of a roller that rests on the outer surface of the control disc on the one hand and the return disc carrying the complementary curve on the other. For this reason, the return levers had to be relatively long, i.e. extended beyond the center of rotation of the control or return discs to the upper end of the control discs.

Apart from the fact that this increased the mass of the movable carriage, this led to the problem that with fast-running tools, considerable lateral

VNR 190 144 50.J160 DE ; Wl/Ac 8 January 1991

forces acted on the slide. Furthermore, additional support of the return lever on the drive shaft was required.

The invention is therefore based on the object of developing the drive device for a punching and bending tool unit of the type described at the outset in such a way that higher movement speeds can be achieved, whereby the arrangement should be designed in such a way for more cost-effective production that the support on the drive shaft can be dispensed with.

This problem is solved by the features of claim 1.

According to the invention, the complementary curve is formed by the inner wall of a cup wheel, so that the tension roller constantly rolls along the inner wall. The control and complementary curves therefore no longer have to rotate in opposite directions, i.e. with a phase shift of 180°. The tension roller can therefore be arranged on the same side of the control disk axis as the pressure roller, with the result that the return lever can be significantly shortened, i.e. with a greatly reduced mass. Since the forces change with a multiple of the power of the moving mass, the design of the drive device according to the invention allows a considerable increase in the movement speeds without placing excessive strain on the slide guides. In addition, the redistribution of the force application points in the area of the control and return disks results in more favorable force effects on the drive shaft, which has a positive effect on the connection technology between the control shaft and the control or return disk.

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Advantageous further developments are the subject of the remaining subclaims.

An embodiment of the invention is explained in more detail below using schematic drawings. They show:

Figure 1 shows a longitudinal section of the drive device with cam-controlled tool slide;

Figure 2 shows the view according to "II" in Figure 1; and
Figure 3 shows the view according to ¹¹ III" in Figure 1.

In the figures, the reference number 2 designates a slide carrier which can be attached to a support plate (not shown in detail) of a punching/bending tool unit with precise positioning. Pins 4, 4b and fastening screws (not shown in detail) are used for this purpose, at least one of which extends through a longitudinal slot 6 in the upper area of the slide carrier 2. The slide carrier 2 extends through a hole in the support plate with a cylindrical bearing extension 8, behind which there is a central drive wheel (not shown in detail) which meshes with drive pinions 10 for a tool slide 12 which can be slidably displaced on the slide carrier 2. The tool slide can be moved along guides 14. Screws 16 on the slide carrier 2 are used to attach guide rails.

The tool carriage 12 can accordingly be moved in the direction of the double arrow B along the carriage carrier 2, with a cam carrier 28 with the cam disks 24 and 26 serving as the drive. The cam carrier 28

VNR 190 144 5Ö>16Q:DE ": Wi/Ac 8 January 1991

is driven by a drive shaft 20 and is thus part of a time-controlled slide drive, which is described in more detail below:

The cam carrier 28 carries a control disk 24 and a return disk 26 arranged at an axial distance AX from it and designed as a cup disk. Both disks are firmly connected to one another and to the cam carrier 28 with the aid of screws 30 and pins 32. The cam carrier 28 sits with the aid of a key 34 in a rotationally fixed manner on a shaft stub 22 of the drive shaft 20, which protrudes freely from the slide carrier 2.

The outer surface 36 of the control disk 24 forms the control working curve for the tool slide 12, which is in contact with the outer surface 36 of the control disk 24 via a pressure roller 38. In the embodiment shown, the control working curve 36 is formed by a circle around the axis 40, which is offset by the dimension EX from the shaft axis 42. However, any other curve contour can be used with which the required movement sequence with regard to feed and return stroke can be achieved.

The control cam for the return movement of the tool slide 12 is formed by an axial inner surface 44 of the cup wheel 26, whereby the contour of the axial inner surface 44 is congruent, i.e. congruent with the contour of the control working cam 36. A tension roller 48 is in contact with the axial inner surface 44, which is rotatably mounted on a fastening screw 50, which is firmly mounted on the upper end of a return lever 52 in the form of a metal rod.

The return lever 52 has a slot 54 through which two fixing screws 56 extend, which are connected to a

VNR 190 144 SO^lSffDE Wi/Ac: 8 January 1991

Base section or a base support 58 of the tool slide 12. In this way, the axial position of the return lever 52 with respect to the tool slide 12 can be adjusted along the double arrow B, thus ensuring that the positive drive is free of play.

The reference number 60 designates a tool coupling piece which is firmly screwed to the tool carriage 12.

The pull roller 48 can have a width B48 that is smaller than the depth T of the axial inner surface 44. The total width of the cup wheel 46 can be kept relatively small in this way.

Due to the reduced inertia forces, the guidance and bearing of the tool slide 12 on the slide carrier 2 can be designed to be low-maintenance by using plastic slideways 18, 18a, 18b at least in sections in the area of the guide surfaces.

If the tension roller engages the cup disk from the side facing away from the control disk, as little axial installation space as possible is required.

The design of the drive device according to the invention results in a favorable flow of force from the pressure roller on the one hand and from the tension roller on the other hand to the control disc or the return disc, which opens up the possibility of mounting the control disc and the cup disc on a common, removable cam carrier.

The complementary curve of the return disk is preferably congruent to the control curve, which results in a very

VNR 190 144 ^: ,.;5tt.£6Ö: DS : Wi/Äe 8 January 1991

simple production of the control and return curve.

Of course, deviations from the drive device described are possible without thereby departing from the basic idea of the invention. It is not absolutely necessary for the control working curve and the control curve for the return movement to be congruent. The curves can also simply be arranged concentrically to one another so that the same movement stroke occurs in the area of the rollers 38 and 48 respectively.

VNR 190 144 50>16piD£ \ wi/Ae 8 January 1991

List of reference symbols

2 carriage carriers

4.4aPins

6 Longitudinal slot

8 Bearing extension

10 drive pinions

12 tool slides

14 tours

16 screw bolts

18 plastic slideways

20 Drive shaft

22 Wavestuiranel

24 Control disc

26 Return disc, cup disc

28 Curve supports

30 Screw

32 pin

34 Key

36 Outer surface = control working curve

38 Pressure roller

40 Axis

42 Shaft axis

44 Axial inner surface

48 Pulley

50 fixing screws

52 Return lever

54 Long hole

56 fixing screws

58 Base section

60 Tool coupling piece

AX axial distance

B Double arrow

B48 Width of 48

EX eccentricity measure

T depth of 44

VNR 190 144 -&Bgr;&Ogr;&sfgr;&iacgr;&bgr;^&udigr;&Egr; * Wi/Ac 8 January 1991

Claims (8)

Protection claims 1. Drive device for a punching/bending tool unit with a cam-controlled, low-maintenance tool slide, which can be moved in a sliding guide and is supported by a pressure roller on an outer surface of a control disk, the return stroke of the slide being carried out by means of a return lever, which is attached to the slide and carries a pull roller, which engages with a complementary curve of the control disk, characterized in that the complementary curve is formed by the inner wall (44) of a cup disk (26) which sits together with the control disk (24) at an axial distance (AX) from the latter on a common drive shaft (20, 34). 2. Drive device according to claim 1, characterized in that the tension roller (48) engages in the cup disk (26) from the side facing away from the control disk (24). 3. Drive device according to claim 1 or 2, characterized in that the control disk (24) and the cup disk (26) are seated on a common cam carrier (28) which is mounted in a rotationally fixed manner on a shaft stub (22) projecting from a slide carrier (2). 4. Drive device according to one of claims 1 to 3, characterized in that the complementary curve (44) is congruent to the control curve (36). VNR 190 144 ^; ...;50. 1 6&Idigr;0: DE \ Wi/Ac 8 January 1991 5. Drive device for a punching/bending tool unit with a cam-controlled tool slide, which is guided in a sliding guide of a slide carrier, in particular according to one of claims 1 to 4, characterized in that the guide surfaces between the slide carrier (2) and tool slide (12) are formed at least in sections by plastic slideways (18, 18a, 18b). 6. Drive device according to claim 5, characterized in that the carriage carrier (2) carries the plastic slideways (18, 18a, 18b). VNR 190 144 S0*lSffJ>E "\ Wi/Ac January 8, 1991