HIGH-SPEED CUTTING DEVICE

Abstract: Device for high-speed cutting of wires, rods and similar, proposed to cut a plurality of reciprocally parallel wires at the same time, which are located in one plane and in the very condition they come from, for example a straightening machine. The device comprises several shears (2) with wire openings (3) mounted close to each other in a stand (1). A hammer (4) belongs to every shears, which in its turn is powered with a separate multiplicator (7). The extension of the hammer (4) in the plane through and at right angle to the wires is less than or equal to the extension of the shears (2) in the direction mentioned, and the multiplicator (7) is free from the hammer (4). By that the shears and the belonging hammers can be mounted close to each other with a uniform partition between all wire openings in the device.

Description: HIGH-SPEED CUTTING DEVICE The present invention is related to a device for high- -speed cutting of wires, comprising a hydraulic hammer, which is assembled on a shears with one movable and one fixed blade, by which the hammer actuates the movable blade. High-speed cutting of wires gives in relation to con¬ ventional slow-speed cutting a cut with less burr. Besides the pro¬ duction capacity will increase. Different devices have been con¬ structed and tested to solve the problems forthcoming at high-speed cutting, and some also are in operation. All existing high-speed cutting devices however have been built to cut one wire at a time. Furthermore they as a rule are bulky and by technical reasons of production, they are foremost aimed for cutting bars with larger dimensions. The task for the present invention therefore is to produce a divice for. high-speed cutting, which permits cutting of a plurality of relativ parallel wires at one time, which are loca¬ ted on the same level, preferably at a horizontal level, but which in a simple way can be changed in order to fit for cutting of more or less wires whith larger or finer dimensions , and which has a little requirement of space. This task is solved by the present invention, which is characterized in that the hammer is so designed that its horizontal extention in a right angle to the feeding direction of the wire is less or equal to the extention of the shears in the direction aen- tioned, that the shears i3 designed whith several holes for wires, that the hammer is pulled by a recoil-releasing cylinder, which is arranged separated from the hammer and only connected with this by a hydraulic line pipe and that the device includes two or several shears , arranged closed to each other in a stand with a uniform divison for all holes, by which one hammer and one multiplicator belongs to every shears . By that the multiplicators belonging to the hammers each are separated from these and by that the hammers are not pro¬ jecting sidewise of the shears, an arbi trary number of shears can be arranged closed to each other. In that an uniform partition can OMPI be maintained betwen all holes in the shears. Partly this causes a great reduction of the need for space and partly the cutting de¬ vice directly can receiv the "carpet" of wires which comes from straightening-machines. It is not unusual that this carpet consits of up to 24 wires. With four holes per shears and six shears as¬ sembled together, the whole carpet directly can be handled and cut into asked lengths. In accordance with one form of performance of the in¬ vention, the multiplicators consist of a pneumatic part including a doubleacting cylinder with a piston, which devides the cylinder in two chambers, by which an air cushion in one chamber acts as a spring and the other chamber is equipped with a quich-exhaus val¬ ve, and a hydraulic part including a hydraulic cylinder whith an oil chamber, an outlet from this which is connected with the hy- draulic hammer by a pipe, and a hydraulic piston connected by a piston rod to the piston in the double-acting pneumatic cylinder. By this design, above everything a very high speed on the out-flowing oil will be reached. The amount of energi, which is transferred to the hammer is controlled by varying the air pres- sure in the air cushion in the chamber. Further, as is clear from above, this design also permits that the multiplicator can be pla¬ ced in an arbitrary place, irrespective of the location of the hammer. In accordance with one form of performance of the in- vention, the hydraulic hammer is formed as a cylindrical pipe with a piston, bored through, working inside, in which a hammer shaft is running, at which lower end a hammer is arranged, provided with an extending stop-face for the piston. Between the piston and the inside of the cylindrical pipe, a space is arranged which is devi- ded in an upper and a lower chamber. At the upper and lower end of the piston, sealings are arranged at the inside of the cylindrical pipe which are hermetic closing, and the lower chamber is connec¬ ted with the hydraulic part of the multiplicator by a connection piece and a pipe. The upper chamber is connected to a source for pressure air by a connection piece and a valve device. After a complete stroke, the hammer thus is returned pneumatically to the starting point. Thus it is ready for another stroke very rapidly, OMPI which put great demands on the feeding device for feeding of wi¬ res to the cutting device. The designing of this one however falls outside the border for the present invention. By the special design of the hammer it is possible to arrange an extension of the hammer shaft and on that arrange weights. The diameters of the weights shall be less than the inner diameter of the cylinder pipe. In that way, a part of the energy transferred by the hammer at the stroke can be varied in a very easy way and by that, two possibilities to vary the amount of energi will be offer- red in accordance with the invention. Further advantages and characteristics will be clear from the detailed description below. The invention will now be described closer in connec¬ tion to the attached figures, which show a form of performance of the invention, and closer in which fig 1 shows a shematic view of a high speed cutting device in accordance with the present inven¬ tion, fig 2 shows a cross section of a hammer along the line II-II in fig 1, fig 3 shows a cross section of a multiplicator in accor¬ dance with the invention along the line III-III in fig 1, fig 4 shows a front view of a shears, and fig 5 shows a cross section of the shearβ in accordance with fig 4 along the line ϊ-ϊ. In fig 1 thus a shematic view of a high speed cutting device in accordance with the present invention is shown. In this performance the device is proposed to recieve a "wire carpet" from for example a straightening-machine including 16 single wires, and cut these into desirable lengths. However the shears are exchangab- le at the same time in which the amount of βtroke energy transfer¬ red by the hammers can be varied. Look further below. Therefore the cutting device can be used for wires or rods in an arbitrary number. A greater or a smaller numer of shears respective hammers can be in¬ cluded in the device without falling outside the border of the in¬ vention despite of that. In a cap 1, which acts as a stand, thus four individual shears 2 are arranged, each with four wire openings 3. A hammer 4 is attached on each shears 2, which as well is hydrau- lie as pneumatic. Each hammer is connected with a multiplicator 7, and connected with a not closer shown source for pressure air by a connection piece 8 and suitable valve devices 9* 10, 11. "BUREA OMPI Every multiplicator has a pneumatic part 12 and a hydraulic part 13, which function will be described closer below. Further, another valve 14 is arranged in connection to each multiplicator, which acts as a quick-exhaust valve, and a safety tank 15 for hydraulic fluid with a belonging valve device 16. Further a pressure gauge 17 can be arranged in the pressure air conduit 18. In fig 2 a cross section of a hammer in accordance with the present invention along the line II-II in fig 1 is shown. The hammer consits of a cylindrical pipe 21 and piston 22 with a hole bored through, working within the pipe. On the piston 22 a hammer shaft 23 with a lower hammer 24 is attached. The hammer 24 shows a shoulder 25 projecting the downward limiting plane of the piston 22. The cylinder pipe 21 is devided into two parts 26, 27. Where these two. parts meet each other,bushings 28, 29 are arranged, which are connected to each other by a sealing 30, which cooperates with the bored piston 22 in that a hermetical sealing between the two parts 26, 27 of the cylinder pipe is maintained. At the upper part respectively lower part of the pis¬ ton 22, more bushings 31» 32 are arranged. These are provided with sealings 55» 34 which hermetically seals at the inner wall of the cylinder pipe 21. The bushings 31* 3 also forms stop faces 35, 36. Furthermore a space is constituted between the envelope of the pis¬ ton 22 and the inner wall of the cylinder pipe 21. By the sealings mentioned, thus an upper chamber 37 and a lower chamber 38 is oon- stituted. Further, connecting piecies, one upper 8 and one lower 5, are arranged in the two central bushings 28, 19. At the upper part of the hammer shaft 23, partly an end casing 40 provided with a shoulder 39 and partly an extension 4 of the hammer shaft is arranged. A helical spring 42 is arranged between the shoulder 39 of the end casing 40, by which the hammer shaft 23 is elastically attached to the piston 22. Veightβ 43 ar¬ ranged at the extension 41, secured with a nut 44. The diameter of the weights are lesβ than the inner diameter of the cylinder pipe. In the figure, the hammer is shown in a start-point position at the end of the stroke. The piston is arranged to stop just above the shears, causing the hammer alone to full ill the stroke. After that, the helical apring 42 returns the hammer * B£fR£A OMPI shaft 23 to the start point relative the piston 22. The lower connection piece 5 is connected with the hydraulic part of the multiplicator described below. Hydraulic fluid is brought to flow into the lower chamber 38 and push the piston 22 downwards. After a complete stroke, pressure air is brought to flow into the upper chamber 37, causing the piston 22 to return to the start-point for a stroke. The sealings 30, 33 > 34 are manufactured in a special plastic material which stands the very high speeds, by which the piston is moved during the stroke. In fig 3 a cross section of a multiplicator along the line III-III in fig 1 in accordance with the present invention is shown. The multiplicator embraces a pneumatic part 12 and a hyd¬ raulic part 13. T e hydraulic part is, as mentioned above, connec- ted with the hydraulic part of the hammer, in that the pneumatic part is connected to a source for pressure air. The multiplicator consists of a double-acting, pneumatic cylinder 47 with a piston 48 working inside, which divides the cylinder in an outer chamber 49 and an inner chamber 50» The piston 48 is connected to a hydrau- lie pi3ton 52 by a piston rod 51 » which in its turn is working in a cylinder 53 with an oil chamber 54 * The outer chamber 49 is con¬ nected to the source for pressure air by a connecting piece 55 be¬ sides that the chamber 54 for hydraulic fluid is connected with the hammer over a connecting piece 56. The inner chamber also is con- nected to the source for pressure air over a connecting piece 57 and a valve device 11, 14, The valve device admits a quick exhaus¬ ting of the inner chamber 50» by which the piston 48 brings the fluid in the chamber 54 to flow to the hydraulic part of the ham¬ mer with a very high speed by the spring-action of the air cushion in the outer chamber 49 via the piston rod 1 and the hydraulic piston 52. By this, the piston in the hammer can be given a very high speed, from which the name of the device in accordance with the invention comes. Owing to differences in areas at the piston 48 in the outer chamber 49 and the inner chamber 50, some form of equalizing must be done them between. In accordance with one form of embodi¬ ment of the invention, an air chamber 58 and a connecting piece 5 OMPI for supplying of pressure air can be arranged between the cylin¬ ders. Alternatively an outward arranged package of springs can be arranged them between. The piston in the double-acting cylinder 47 is tighte- ned by a rubber sealing 50. In accordance with another probable em¬ bodiment, the cylinder 47 and the piston 48 can be replaced by a bellow, which has to actuate the piston rod 51. The multiplicator operates in the same way moreover. In fig 4 a shears is shown, seen from the out-put side and is enveloped in the cap 1, which also acts as a sort of stand, also compare fig 1. At the out-put opening 61, the movable shears 62 with the wire openings 5 can be seen. As mentioned earlier, the number of wire openings shown in the drawings,has only been cho¬ sen as an example. In connection to the upper side of the shears the hammer and the cylindrical pipe i3 shown with broken lines. As is suggested in the figure, the design of the hammer admits the different shears to be placed closed to each other. By this, the great advantage with an uniform division between all wire openings will be reached, at the same time as the need of space will be mi- nimized. In fig 5 a cross section of the shears and the hammer along the line ϊ-ϊ in fig 4 i3 shown. The shears consist of a fixed blade 6J and a movable blade 62. The movable blad 62 is guided in the stand 1 and is resting on a spring package 64. Tha spring pac- kage keeps the movable blade in contact with a stop face 65 adjus¬ ted to keep the bore hole 66 in the movable, blade directed to the bore hole 67 in the fixed blade. The bore hole 67 is provided with a funnel-shaped inlet 68 in order to facilitate the guidance of the wires in the shears. The movable blade 62 is connected to a stroke piston 69, which will be hit by the hammer 24 at the cutting. The βtroke piston 69 is at the top provided with a flange which supports against an elastic ring of, for example adiprene, by which residual energi form the hammer 24 is absorbed. The cap 1 preferrably shall be designed allowing the hammers to be fixed mounted in it, at the same time as the blades of the shears can be replaced. In a suitable way, preferrable the blades shall be put together to an unit, which simply can be replaced by pulling into or out from the cap 1. The detailed design is not determinating for the invention but several different solu¬ tions are possible. A great advantage with the design as above, is that the chambers in this way can be designed as fully closed to the surroun¬ dings, which among others gives a considerable sound absorbtion. Further the risk for injuries on hands also is eliminated by this. futfH4 OMPI

Claims: PATENT CLAIMS 1. High-speed cutting device for wires, rods and so on, comprising a hydraulic hammer, assembled on a shears with one movable and one fixed blade, by which the hammer actuates the mo¬ vable blade, c h a r a c t e r i s e d in that the shears (2) is designed with several holes (3) for one or several wires located in one plane, that the extension of the hammer (4) in the plane through and at a right angle to the wires, is less or equal to the extension of the shears (2) in the direction mentioned, that the hammer (4) is powered by a multiplicator (7)* which is arranged devided from the hammer and only connected to that by a hydraulic piping, and that the device comprises two or several shears (2) arranged closed to each other in a stand (1), with an uniform par¬ tition, by which a hammer and a multiplicator belongs to every shears. 2. Device in accordance with claim 1, c h a r a c ¬ t e r i s e d in that the multiplicator (7) consists of one pneu¬ matic part (12), comprising a double-acting cylinder (47) with a piston (48), which devides the cylinder in two chambers (49 f 50), by which an air cushion in one chamber (49) acts as a spring and the other chamber (50) is provided with a quick-exhaust valve (11, 14), and a hydraulic part (13) » comprising a hydraulic cylinder (53) with an oil chamber (54), a connecting piece (56) at that one, which is connected to the hydraulic hammer (4) by a piping, and hydraulic piston (52) connected by a piston rod (51) with the pis— ton (48) in the double-acting pneumatic cylinder (47). 3. Device in accordance with claim 1, c h a r a c ¬ t e r i s e d in that the hydraulic hammer is designed as a cy¬ linder pipe (21) with a bored piston (22) working inside, in which a hammer shaft (23) is running, at which lower part a hammer (24) with a projecting stop face (25) is arranged. 4. Device in accordance with claim 1, c h a r a c ¬ t e r i s e d in that blades (62, 63) in two or several shears (2) mounted together, are put together in a unity, which can be pushed into, respective pulled out of the stand cap (1) without dismoun- ting the rest of the device. 5. Device in accordance with claim 1, c h a r a c ¬ t e r i s e d in that the hammers (4) are mounted on the oap (1) with a closed lower end, eventually figthened with a rubber sea¬ ling (70).

Inventors: JANSSON ELIS, JANSSON, ELIS
Applicants: JANSSON ELIS, JANSSON, ELIS
Application year: 1984
Main classification: B21F11
IPC codes: B21F11, B23D15, B23D23