EP0516642B1 - Rotary shears - Google Patents

Abstract

PCT No. PCT/EP91/00237 Sec. 371 Date Jul. 17, 1992 Sec. 102(e) Date Jul. 17, 1992 PCT Filed Feb. 8, 1991 PCT Pub. No. WO91/12938 PCT Pub. Date Sep. 5, 1991.Rotary shears for dividing sheet steel strips for sheet steel panels into several bands including a machine frame, two blade shafts rotatably mounted in a machine frame at an adjustable distance apart and at least one of which is driven, roller blades which can be positioned axially on the blade shafts, a manipulator which can slide on the machine frame parallel to the blade shafts and which positions the roller blades axially on the blade shafts and releasable clamps for clamping the roller blades on the blade shafts in predetermined positions. All roller blades can be positioned on the blade shafts individually and independently of each other by the manipulator and can be clamped on the blade shafts individually and independently of each other by the clamps.

Description

The invention relates to a roller shear according to the preamble of claim 1.

In a known roller shear of this type (brochure from Fagor from "MM Maschinenmarkt", No. 29/1989), each knife shaft is surrounded by a sleeve on which the roller knives can be axially positioned. The sleeve can be stretched by means of a hydraulic medium introduced between the knife shaft and the sleeve, as a result of which the roller knives can be clamped on the knife shaft. This has the disadvantage that all roller knives are either either clamped on the knife shaft or can be moved without tension on this. In particular, one has to fear that if a roller knife is positioned, it will change its position again, for example as a result of vibrations from the machine, so that in the end it is not possible to set exact distances between the roller knives. In addition, the manipulator of the known roller shears is designed so that the roller knives of the lower knife shaft can only be adjusted with the entrainment of the roller knives on the upper knife shaft and the manipulator must individually perform a stroke movement of the roller knives on the upper knife shaft in order to move from the roller knives of the lower Knife shaft to get free. This makes the positioning of the roller knives on their knife shafts time-consuming and cumbersome.

It is an object of the invention to improve a generic roller shears so that the positioning of the roller knives on their knife shafts can be carried out quickly and easily by the manipulator, and the roller knives can no longer leave their positions as long as further roller knives are set on the knife shaft.

The object is achieved by the features of claim 1.

Figur 1

schematisch eine Rollenschere in Vorderansicht;

Figur 2

eine Schnittansicht entlang der Linie 2-2 in Figur 1;

Figur 3

eine Schnittansicht entlang der Linie 3-3 in Figur 1;

Figur 4

schematisch eine Draufsicht eines Manipulators mit zugeordnetem Rollenmesser entsprechend der Linie 4-4 in Figur 1;

Figur 5

eine Axialschnittansicht einer mechanischen Rollenmesser-Spanneinrichtung;

Figur 6

eine Axialschnittansicht einer hydraulischen Rollenmesser-Spanneinrichtung;

Figur 7

eine Stirnansicht der Spanneinrichtung aus Figur 6;

Figur 8

eine bevorzugte Rollenmesseranordnung und

Figur 9

eine andere bevorzugte Rollenmesseranordnung.

The following description of preferred embodiments of the invention serves in conjunction with the accompanying drawings for further explanation. Show it:

Figure 1

schematically a roller shear in front view;

Figure 2

a sectional view taken along line 2-2 in Figure 1;

Figure 3

a sectional view taken along line 3-3 in Figure 1;

Figure 4

schematically shows a plan view of a manipulator with an associated roller knife along the line 4-4 in Figure 1;

Figure 5

an axial sectional view of a mechanical roller knife clamping device;

Figure 6

an axial sectional view of a hydraulic roller knife clamping device;

Figure 7

an end view of the clamping device of Figure 6;

Figure 8

a preferred roller knife assembly and

Figure 9

another preferred roller knife assembly.

The roller shear 1 shown schematically in Figure 1 comprises a machine frame 2 with two knife shafts 5, 6 rotatably mounted in stands 3, 4 of this frame. The knife shafts are adjustable relative to each other in a manner yet to be described, so that their mutual distance can be set. The lower cutter shaft 6 (in FIG. 1) can be driven directly via a pulley 7 in a known manner by a motor (not shown) accommodated in the machine frame 2.

As Figure 2 shows, sit in the area of the stator 3 on the knife shafts 5 and 6 gears 8 and 9, which are connected by further gear wheels 11, 12 mounted on the stator 3 so that when driving the lower knife shaft 6 via the Pulley 7, the upper knife shaft 5 is taken in opposite directions. As can also be seen from FIG. 2, the upper knife shaft 5 can be displaced vertically by means of a slide 13 in the stand 3, so that the relative distance to the lower knife shaft 6 can be set. The same applies to the stand 4 in which the upper knife shaft 5 is also adjustably mounted by means of a slide. The adjustment of the upper knife shaft 5 by the mentioned slide 13 is so small that the gears 8, 11 do not come out of engagement and thus both knife shafts 5 and 6 can always be driven.

Roller knives 14 are arranged on the knife shafts 5 and 6 and rotate together with the knife shafts. The roller knives can be positioned and clamped in the desired manner on the knife shafts 5, 6 in a manner to be described. Since the roller knives of the one knife shaft are very closely adjacent to those of the other knife shaft in the final state, the two knife shafts 5 and 6 are separated from one another in the manner described during the positioning of the roller knives on their knife shafts. After positioning has been carried out, the two cutter shafts 5, 6 are brought closer to one another again.

In FIG. 1, four roller knives 14 on the left are arranged on their knife shafts 5, 6 in pairs opposite one another, so that a correspondingly wide sheet metal strip or a correspondingly wide sheet metal plate can be divided into three strips of different widths, the strip width in each case being the distance between the roller blades 14 corresponds to their knife shafts 5, 6. The two roller knives 14 arranged on the far right in FIG. 1 on the knife shafts 5, 6 are out of operation. They can be put into operation if, for example, a sheet metal strip is to be divided into more than three strips.

The roller shear 1 also includes, as well 1 shows a manipulator 15, by means of which the roller knives 14 can be individually and independently positioned and clamped on their knife shafts 5, 6. The manipulator can be pushed back and forth parallel to the knife shafts 5 and 6 with the aid of a sliding guide 20 running horizontally along the machine frame 2. The manipulator 15 is driven via a screw spindle 16 which engages in a corresponding nut 17 of the manipulator 15. As shown in FIG. 3, the screw spindle 16 can be driven in either direction of rotation by a motor 18 arranged in the machine frame 2. In Figure 3, the mentioned slide guide 20, on which the manipulator 15 is displaceable, is indicated schematically.

The manipulator has a frame 19 which surrounds both knife shafts 5, 6 and the roller knives 14 seated on them in a ring. As can be seen from FIGS. 3 and 4, a total of four slides 21 are provided in pairs in the frame 19 of the manipulator 15, which have concavely curved cutting edges 22 with which they can engage positively and without play in corresponding grooves 23 of the roller knives 14. Each two opposing slides 21 are assigned to a knife shaft 5 or 6 and the roller knives 14 arranged thereon. The slides 21 are horizontally displaceably mounted in the frame 19 and can be moved by remote-controlled hydraulic or pneumatic cylinders 24 so that their cutting edges 22 either engage in the grooves 23 of the roller knives 14 or are pulled out of them. When the slides 21 with their cutting edges 22 into the grooves 23 of the roller knives 14 intervene, the roller knives are taken along when moving the manipulator 15 and moved on their knife shafts 5, 6, provided that the clamping means still to be described, which are effective between the knife shafts and the roller knives, have been released. When the slides 21 with their cutting edges 22 are withdrawn from the grooves 23 of the roller knives, the manipulator 15 can run freely past the roller knives 14.

In the frame 19 of the manipulator 15, fingers 25 are furthermore displaceably mounted on both sides of the slide, which can be advanced or retracted remotely with the aid of working cylinders 26 with reference to the roller knives 14. These fingers 25 are used in a manner to be described to actuate the clamping means, with the aid of which the roller knives 14 can be clamped on their knife shafts 5, 6 or released from them.

FIG. 5 shows the structure of a roller knife 14 in a first embodiment with mechanically acting clamping means. On the outside of the knife shaft 5 (the same applies to the knife shaft 6), an outwardly open axial groove 31 is formed, in which a feather key 32 is displaceable. The feather key 32 is firmly connected by screws 33 to a hub part 34 surrounding the knife shaft 5. In this way, the hub part 34 is held on the knife shaft 5 in a rotationally fixed but axially displaceable manner.

With the hub part 34, a knife part 36 with the groove 23 already mentioned and a lifting part are provided by screws 35 37 firmly connected. The lifting part 37 is in turn enclosed by a lifting ring 38, which can be made of resilient plastic and the outer peripheral surface of which is essentially flush with the outer peripheral surface of the knife part 36. The actual cutting edge of the knife part 36 is designated in FIG. 5 by the reference number 39. Knife part 36 and lifting part 37 with the lifting ring 38 are thus arranged together with the hub part 34 in a rotationally fixed manner on the knife shaft 5, but are axially displaceable on this shaft

As can further be seen from FIG. 5, the knife shaft 5 is enclosed by an annular part 41 which partially extends over the hub part 34. The ring part 41 is freely rotatable on the knife shaft 5. A set screw 42, which engages in a corresponding annular groove 43 of the hub part 34, prevents axial movement of the ring part 41 relative to the hub part 34 and thus ensures the cohesion of these two parts. The outer circumferential surface 44 of the hub part 34 and the inner circumferential surface 45 of the ring part 41 overlapping this surface 44 are eccentric to the central axis of the knife shaft 5. As a result, by appropriate rotation of the ring part 41 on the knife shaft 5, the hub part 34 and with it the entire roller knife 14 can be clamped on the knife shaft 5. When the ring part 41 is rotated relative to the knife shaft 5 in the opposite direction of rotation, the roller knife 14 is released from the knife shaft 5 so that it can be axially displaced and positioned on the latter. The inner peripheral surface 46, with which the ring part 41 is seated on the knife shaft 5, is circular-cylindrical and concentric with the central axis of this shaft.

On the outer circumference of the ring part 41, countersunk in corresponding axial grooves, are fastened with the aid of screws 47 at angular intervals of, for example, 60 °, stop blocks 48 which protrude beyond the outer circumferential surface 49 of the ring part 41 and with the above part stop surfaces for those already in connection with Figures 3 and 4 mentioned fingers 25 of the manipulator 15 form. In Figure 4, the stop blocks 48 are also drawn with their radially directed stop surfaces. It can be seen in FIG. 4 how the finger 25 located there on the right abuts the stop surface of the stop block 48 and thereby prevents the relevant ring part 41 from rotating in a certain direction of rotation. The finger 25 on the left in FIG. 4, on the other hand, is retracted and is therefore not able to strike a stop block 48. As can also be seen from FIG. 4, the two fingers 25 are each so far away from the slide 21 that whenever the concave cutting edge 22 of the slide engages in the groove 23 of a roller knife 14, a finger 25 on the stop block 48 of this knife associated ring part 41 can attack. If, in FIG. 4, the slider 21 with its cutting edge 22 engages in the groove 23 of the roller knife 14 on the left, the finger 25 on the left in this figure could come into engagement with the stop block 48 of the left roller knife 14.

Thus, all roller knives 14 can be positioned individually and independently of one another on their knife shafts 5, 6 by the manipulator 15 in the following manner: with knife shafts 5, 6 (slider 13 in FIG. 2) which are spaced apart from one another, the manipulator 15 is positioned in front of a specific one on the upper or lower knife shaft 5 or 6 seated Roller knife 14 brought up, initially assuming that this roller knife is not clamped on its knife shaft. Then the two slides 21 assigned to the relevant knife shaft are advanced so that they engage in the groove 23 of the roller knife 14. Then, by means of a corresponding remote-controlled displacement of the manipulator on its sliding guide with the aid of the screw spindle 16, the roller knife 14 now taken along by the manipulator is positioned at the desired point on the knife shaft. One of the fingers 25 is then advanced in the manner shown in FIG. Now the knife shaft is set in rotation. One of the stop blocks 48 comes into engagement with the advanced finger 25 so that the associated ring part 41 cannot rotate any further. A further rotation of the knife shaft belonging to the ring part 41 now inevitably causes the ring part 41 and thus the associated roller knife 14 to be fixed firmly on the knife shaft, specifically because of the above-described eccentricity of the peripheral surfaces 44, 45 on the hub part 34 or on the ring part 41 Roller knife 14 of its knife shaft is reversed: the knife shaft is rotated in the opposite direction of rotation until the advanced finger 25 strikes one of the stop blocks 48, so that the ring part 41 is thereby held. Upon further rotation of the knife shaft, the tension between the ring part and the hub part is now released, so that the roller knife 14 can be axially displaced and positioned on its knife shaft.

The clamping means described in connection with FIG. 5 act due to the eccentricity described Circumferential surfaces 44, 45 purely mechanically. In the following, clamping devices which act hydraulically are described in connection with FIGS. 6 and 7.

According to FIGS. 6 and 7, a roller knife 14 comprises a clamping sleeve 51 which surrounds the associated knife shaft (not shown in FIGS. 6 and 7). The clamping sleeve 51 has on one side a radially projecting end wall 52 from the knife shaft. A hub part 53 is pushed onto the clamping sleeve 51, which has a recessed annular space 54 filled with hydraulic medium on its inner circumferential surface facing the sleeve 51. Sealing rings 55 are arranged on both sides of the annular space 54 between the sleeve 51 and the hub part 53. A feather key 56, which is fastened with a screw 57 to the end wall 52 of the sleeve 51 and to the hub part 53, projects into a corresponding groove running axially on the outside of the associated knife shaft, which corresponds to the groove 31 in FIG. The feather key 56 thus holds the clamping sleeve 51 and the hub part 53 in a rotationally fixed but axially displaceable manner on the knife shaft. On the outer circumferential surface of the hub part 53, a ring part 58 is rotatably seated, which is prevented from axially displacing relative to the hub part 53 by a radially projecting ring 59 connected to the latter and by a step 61 on the hub part 53. At angular intervals of, for example, 60 °, the hub part 53 has radially running bores 62 which are connected to the annular space 54 and in which the pistons 63 can be moved in a sealed manner. The heads of the pistons 63 protrude beyond the circular cylindrical, outer circumferential surface of the hub part 53. The bores 62, like the annular space 54, are filled with hydraulic medium. Accordingly, if one or if several of the pistons 63 are moved radially inwards in the bores 62, the hydraulic pressure in the annular space 54 increases. The clamping sleeve 51 is accordingly pressed together and clamped on the knife shaft enclosed by it. Since the clamping sleeve 51 is firmly connected to the hub part 53, the entire roller knife can be clamped in a desired position on the knife shaft in this way.

As shown in FIG. 6, the hub part 53 has a step-shaped recess which is open towards the right and in which, in the manner shown in FIG. 5, a knife part 36 and a lifting part 37 with a lifting ring 38 can be firmly arranged, which is not the case in FIG. 6 is shown specifically.

In order to move the pistons 63 in the hub part 53 radially inwards in order to increase the hydraulic pressure in the annular recess 54, the ring part 58, as can best be seen from FIG. 7, has inner surfaces 60 which extend eccentrically to the central axis of the knife shaft in such a way that with a corresponding rotation of the ring part 58 relative to the outside of the circular cylindrical hub part 53 (to the right in FIG. 7), the inner distance between the inner surface 60 and the hub part 53 becomes smaller, as a result of which the piston 63 is forced into its bore by the inner surface 60 acting on the piston head 62 is pressed inwards.

In order to be able to automatically exert this relative rotation between the ring part 58 and the hub part 53 with the aid of the manipulator 15, 58 are on the outside of the ring part Cutouts 64 with radial stop surfaces are provided at certain angular distances, into which one of the fingers 25 (FIG. 4) can be inserted. As a result, the ring part 58 is prevented from further rotation in a certain direction of rotation (for example to the left in FIG. 7). If the knife shaft and the hub part 53 connected to it in a rotationally fixed manner are rotated further in the same direction of rotation, the piston 63 is displaced in its bore 62 due to the described eccentric inner surface 60 of the ring part 58 and the arrangement on the knife shaft is clamped due to the hydraulic pressure thereby increasing . If the rotation takes place in the opposite direction, the piston 63 is displaced radially outwards by the prevailing hydraulic pressure during a relative rotation between the hub part 53 and the ring part 58, so that the tension is released and the roller knife 14 can now be axially displaced on its knife shaft.

As can be seen, for example, from FIGS. 4, 5 and 6, the hub parts 34, 53 and ring parts 41, 58 project axially on one side over the knife part 36 and the lifting ring 38. The arrangement of knife part 36 and lifting ring 38 can be made such that either knife part 36 or lifting ring 38 is adjacent to the hub or ring part. In Figure 8, a total of six roller knives 14 on the upper knife shaft 5 and the lower knife shaft 6 are arranged as close as possible to one another, the respective roller knives 14 abutting each other. As shown, the arrangement on each knife shaft is such that the ring part 41 alternately adjoins a knife part 36 and a lifting ring 38, respectively on the upper shaft 5 each knife part 36 and lifting ring 38 are arranged reversed, as on the lower knife shaft 6. All ring parts 41 are directed in the same direction (to the right). A sheet metal strip is divided using the roller knives at the adjacent edges of a lower and upper knife part 36. In the arrangement shown in FIG. 8, the same minimum strip width can be achieved, which is indicated by dimension A.

The roller knife arrangement according to FIG. 9 differs from that according to FIG. 8 in that the ring parts 41 are directed alternately towards different sides, but in each case on the knife shaft 5 always lifting rings 38 on the ring parts 41 and on the knife shaft 6 always knife parts 36 on the Connect ring parts. With this arrangement of the roller knives there are alternating different strip widths, the dimensions of which are indicated by B and C in FIG. 9. B is smaller, C is larger than A. A can be, for example, 73, B 40.5 and C 106 mm.

In the embodiment of roller shears described with reference to FIGS. 1 and 2, both cutter shafts 5, 6 are driven because of the gear wheels 11, 12 acting between them. In principle, it is sufficient to drive only one of the knife shafts 5 or 6. When inserting a sheet between the roller knives, the other knife shaft and the roller knives sitting on it are inevitably taken along.

As described above, it is due to the Constructed training made possible to position all roller knives 14 individually and independently on their knife shafts with the aid of the manipulator 15. In addition, all roller knives 14 can be clamped individually and independently on the knife shaft by the clamping means described, namely once by the eccentric peripheral surfaces 44, 45 and on the other hand by the hydraulically actuated clamping sleeve 51, for which purpose the manipulator 15 is also used.

The roller shear described is assigned a programmable computer in a manner known per se and therefore not specifically illustrated and described, which computer records all the rotary and displacement movements of the parts described, in particular the knife shafts 5, 6, the manipulator 15, the slide 21 and the fingers 25 controls and in which the respective positions of the roller knives are stored, so that any preselectable positions of the roller knives can be set.

Claims (8)

1. Rotary shears (1) for dividing sheet metal strips or panels into a plurality of bands, comprising a machine frame (2), with two cutter shafts (5, 6) rotatably mounted in the said frame at an adjustable distance apart, and at least one thereof being driven, the said shears also comprising rotary cutters (14) which can be positioned axially directly on the cutter shafts, a single manipulator (15), displaceable on the machine frame parallel to the cutter shafts, for axial positioning of the rotary cutters on their cutter shafts, and releasable clamping means (44, 45; 51) acting between the cutter shafts and the rotary cutters, for clamping all the rotary cutters on the cutter shafts in pre-determined positions;
   characterised in that
   each rotary cutter (14) can be positioned on the cutter shaft (5, 6) individually and independently of the other rotary cutters, by displacement of the single manipulator (15);
   the rotary cutters (14) can be clamped on the cutter shaft (5, 6) individually and independently of the other rotary cutters, using the clamping means (44, 45; 51);
   and the clamping means (44, 45; 51) can be actuated by the individual manipulator (15) correspondingly positioned by displacement,
   each rotary cutter (14) comprising a hub part (34; 53) connected to a cutter part (36) and arranged on the cutter shaft (5, 6) in a rotationally rigid yet axially displaceable manner;
   the hub part (34; 53) being at least partially covered, over its outer peripheral surface, by an annular part (41; 58);
   the hub part (34; 53) being clampable on the cutter shaft (5, 6) by means of turning in relation to the annular part (41, 58), to prevent axial displacement; and
   the manipulator (15) having means (25) to securely retain the annular part (41; 58) so that upon turning of the cutter shaft (5, 6), the hub part (34; 53) can be turned in relation to the annular part.
2. Rotary shears in accordance with claim 1, characterised in that two pairs of slides (21), operable by remote control, are provided opposite one another in the manipulator (15), and are associated with a respective cutter shaft (5, 6), and the slides (21) can be positioned in pairs from the outside against the rotary cutters (14) in a play-free manner, so that upon displacement of the manipulator (15) the rotary cutters (14) on the cutter shafts (5, 6) are also axially displaced therewith.
3. Rotary shears in accordance with claim 2, characterised in that the slides (21) engage in a positive-locking manner in a correspondingly profiled groove (23) on the periphery of the rotary cutters (14).
4. Rotary shears in accordance with claim 1 or 2, characterised in that each rotary cutter (14) comprises a hub part (34) connected to a cutter part (36) and arranged on the cutter shaft (5, 6) in a rotationally rigid yet axially displaceable manner, and the said hub part (34) is at least partially covered, over its outer peripheral surface, by an annular part (41), and in the vicinity of the covered region on the hub part and the annular part, cylindrical surfaces (44, 45), engaging in one another and eccentric in relation to the rotational axis of the cutter shaft (5, 6), are provided in such a manner that upon turning of the hub part (34) in relation to the annular part (41), the hub part (34) together with the cutter part (36) is clamped on the cutter shaft (5, 6) to prevent axial displacement.
5. Rotary shears in accordance with claim 1 or 2, characterised in that each rotary cutter (14) comprises a hub part (53) connected to a separate cutter part (36) and arranged on the cutter shaft (5, 6) in a rotationally rigid yet axially displaceable manner, and the hub part (53) is at least partially covered, over its outer peripheral surface, by an annular part (58), and a clamping sleeve (51) is connected in a rotationally rigid manner to the hub part (53) on the inner peripheral surface thereof between the cutter shaft (5, 6) and the hub part, and between the clamping sleeve (51) and the hub part (53) there is a sealed annular region (54) for a hydraulic medium, via which the clamping sleeve (51) and hence the clamping part (53) can be clamped on the cutter shaft (5, 6), and at least one cylindrical bore (62) is provided in the hub part (53) in a substantially radial direction, and communicates with the annular region (54), and a piston (63), with a piston head projecting beyond the outer peripheral surface of the hub part (53), can be displaced in the said bore (62), and the inner peripheral surface of the annular part (58), covering the outer peripheral surface of the hub part (53), extends eccentrically in relation to the rotational axis of the cutter shaft (5, 6), and the head of the piston (63) rests against the said eccentric surface, in such a manner that upon turning the hub part (53) in relation to the annular part (58), the piston (63) is displaced in the cylindrical bore (62) and hence the pressure of the hydraulic medium is altered.
6. Rotary shears in accordance with claim 4 or 5, characterised in that a respective remote-controlled finger (25) is provided on the manipulator (15) in the vicinity of the cutter shafts (5, 6), and it is possible to bring the said fingers into engagement with stop surfaces (48, 64) on the annular part (41, 58), and hence the annular part (41, 58) is prevented from turning, and when the annular part (41, 58) is blocked in this manner, the clamping means (44, 45; 51) can be actuated by simultaneous turning of the cutter shafts (5, 6).
7. Rotary shears in accordance with claim 6, characterised in that the manipulator (15) has a frame (19) surrounding both cutter shafts (5, 6) in an annular manner on all sides, and the slides (21) and the fingers (25) are arranged on the said frame.
8. Rotary shears in accordance with claim 4 or 5, characterised in that each rotary cutter (14) has a resilient lifting ring (38) and the hub parts and annular parts (34, 41; 53, 58) project axially on one side beyond the cutter part (36) or the lifting ring (38), and the rotary cutters (14) are arranged on the cutter shaft (5, 6) in such a manner that either all the hub parts and annular parts are oriented towards the same side, or are oriented alternately towards opposite sides.

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