MXPA98002386A - Punching machine for cut programming by means of punches - Google Patents

Abstract

A device for cut programming by punches (16), realised with a digital technique and applicable in particular to punching machines (12) with a ram (20) cantilever-developed above an underlying work top (18), comprising means for sensing a univocal identification signal coming from one or more encoders (46) and/or (46') connected to each of said punches (16), activated by the signal emitted by at least an antenna (10) caused to be integral with said ram (20).

Description

J CUTTER FOR CUTTING PROGRAMMED THROUGH * TROQUELS DISCLOSURE OF THE INVENTION The present invention relates to a punching machine 5 or cutting press for programmed cutting by means of dies. More particularly, the present invention relates to a device as defined above, which allows to unequivocally identify, at the time of its use, a cutting die and any of the cutting fronts thereof. The device, advantageously performed according to a The digital technique comprises means capable of detecting the identification signal of one or more encoders that are applied to each die. As is known, the specific machines, called punching machines, are used in the sector of the footwear industry and leather goods in general, which machines allow to obtain from leather, leather products or products semi-trimmed skin, such as, for example, shoe shovels. The punching machines of the known art, of the ram or cart type, comprise a work table on which the material to be cut is placed; the dies are superimposed on the last one, which the operator manually positions, choosing each time, the one necessary to obtain the semi-finished product with a given form and development. In fact, the dies are constituted by cutting edge templates, whose perimetric configuration corresponds exactly to the development of the semi-finished product to be obtained; in most cases the opposite edges of the dies are sharp edges, in such a way that they can be rotated to obtain right or left parts. This operation REF: 27090 of cutting of the material with dies, is simple and direct although it can be seen, in fact some severe disadvantages. In effect, it is necessary for the operator to identify exactly the die to be used each time, taking the one that exactly corresponds to the form to be obtained. There are many dies for each article, very similar to each other, whose size and development is only marginally different; in the case of shoe shovels, in particular, the differentiation is due to the size, which causes the realization of shoes entirely similar to each other, except for the size. In some cases, the difference between the dies is minimal, which can not be seen with the naked eye, since shoes have to be made with a difference of half size in size; therefore, the operator must pay special attention when taking the corresponding die from the inventory, controlling it each time, which takes a long time of production. An additional disadvantage that is found with this work is associated to the dies for shovels of the shoes, which are provided with a double cutting edge or edge, developed on the opposite fronts, to obtain semi-finished products left and right. It often happens that the operator accidentally places the die on the material in an incorrect position, to obtain therefore semi-finished products instead of left or vice versa. In order to prevent these disadvantages, special containers are used, provided with individual holes as there are dies. In these containers, located near the punching machines, the holes are identified exactly to accommodate the specific dies, to prevent their disorderly positioning which would involve an exact choice and control ,, i »& smtm. * jg ^ fiyí adoso before using it. The solution, although it is advantageous, does not exclude the risk of the punch from one hole instead of another or that, once the operation is completed, the punch returns in a hole different from the one assigned. In addition, the presence of these containers does not exclude the risk of positioning the material the removed die in a rotated position. An object of this invention is to eliminate the above disadvantages. More in particular, the object of this invention is to provide a device for programmed cutting by means of dies capable of allowing the rapid or identification of the type of die in its positioning on the material to be cut. A further object of this invention is to provide a device as defined above, which allows additional verification of the right or left cutting direction. An object, not last, of the invention is to provide a device for cutting by means of dies, in such a way that it does not require the use of containers that have specific holes from which the dies are systematically removed or repositioned therein. . A further object of the invention is to provide users with a device capable of ensuring a high degree of resistance and reliability over time and also in such a way that it is produced easily and economically. These and still other objects are obtained by means of the device for cutting programmed by means of dies of the invention, obtained by means of a digital technique, applicable in particular to punching machines equipped with a cantilevered apex of an underlying upper table, comprises means for # * * * f, "" «(***,?. <? < 6, i, f detect an unambiguous identification signal from one or 3? s encoders connected to each of the dies, activated by the signal emitted by at least one integral antenna with the ram The construction and the functional characteristics of the present invention will be better understood thanks to the following description, wherein reference is made to the accompanying drawings, which represent a Preferred non-limiting embodiment and wherein: Figure 1 shows schematically the top view of a conventional punching machine, of the type provided with a ram, equipped with the device of the invention, which interacts with the units coupled to the individual dies; Figure 2 schematically shows a partial profile of a conventional punching machine, provided with means or detection units interacting with the device; Figure 3 m shows schematically in cross section the detection means applied to the individual dies; Figure 4 shows a block diagram of the components of the device of the present invention. With reference to the figures, the device of the present invention, obtained with a digital technique and provided with appropriate means for detecting an unambiguous identification signal, coming from at least one electromagnetic encoder or transponder applied to the individual dies, basically comprises a transceiver antenna 10, applied to a punching machine known per se, for example a punching machine of the type equipped with a ram, indicated generally by 12 in Figure 1; The device also comprises W * "ft ',, (? T (..,«, »* • ***» * mA. tuno or more electromagnetic encoders integrated in a box or case 14 connected to each x the dies indicated by 16, which detectors interact with the previous antenna. the jL? pa trajelH ± ra or bone. mp lfc 12 mμLfenda a table 1S de rcfca or, 5 on which the material to be cut is placed-leather, leather, imitation leather- and an apete, superimposed relatively to the work table 18, with respect to which they are made to move vertically by means known per se, to compress or press the dies 16 to cut the material. The antenna 10, constituted by way of example by means of a coil with one or more windings, is connected to the ram 20 of the punching machine 12, that is in a position relatively opposite to the work table 18 on which the material is placed. be cut through the dies. Preferably, the antenna 10 extends longitudinally along one side of the ram 20, by a portion greater than the depth of the table 16 of and is cantilevered to the arm by any known means, for example by a plate-like element 22; Conventional clamping means j? j, such as screws 24, 24 'or the like cause the antenna 10 to be integral with the plate-like element 22 and respectively the last one to the ram 20. The antenna 10 is defined, in the manner of example, in the is a graphic representation of FIG. 1, by means of a rectangular body of limited height, made of insulating material, which incorporates the coil with one or more windings, electrically powered by a conventional cable 26. The device of the present invention comprises, in addition to the antenna 10 and the electromagnetic encoders mentioned above, housed in the box or case 14, which will be explained in more detail later in the This is a present-a central unit provided with a microprocessor 28, with ™ storage 28 'of phosphates, a decoder 30, a control board 32 with keyboard and alphanumeric display, a driver 34 or the like and an amplifier 36 for antenna 10; the components are indicated in the block diagram of the figure 1, which clearly shows the connections. The electromagnetic encoders integrated in the case 14 applied to the dies 16 are of a known type and require an interrogator-receiver. The interrogator-receiver unit is constituted by a signal generator, an amplifier, a receiver, a group of bandpass filters and a 9"section capable of decoding the set of data transmitted by the encoder and received by means of inductive coupling. The latter is constituted by a section for capturing the power signal transmitted by the interrogator-receiver, a section capable of encoding the signal obtained according to a given code contained in a memory, also as a section of appropriate amplification to allow transmission in the air. According to a non-critical preferred embodiment, the electromagnetic encoders or transponders & employees are of the read-only type, of a code. The case 14 incorporating the encoders is integral with any means with the individual dies 16, externally or internally in relation to its formed edge; in the example of Figure 2, the case 14, preferably made of plastic material, such as nylon or the like, has a substantially cylindrical planar configuration and defines, along the entire perimeter or part thereof, a throat 40 which has, as an example, a semicircular profile. A frame 42, formed by a metal iron rod, having a section complementary to the profile 40, constitutes the means for securing the case 14 to the die 16; the frame 42 is . * «* -. i ** J advantageously in a fork configuration, in such a way that the free ends of their bracts or opposite branches can enter corresponding holes or through holes obtained Ib along the edge of the die 16. The connection between the frame 42 and the die 13 can be obtained by any known means and can be fixed or movable. Obviously the frame 42 can be replaced by different connection means, for example formed by clamps of a conventional type. The case 14 defines in its interior a chamber 44, which houses, in correspondence of the upper and lower fronts, one or two electromagnetic encoders. Figure 3 shows a cross-section of a case 14, where two electromagnetic encoders are placed, indicated by 46 and 46 '; this solution is adopted by the dies 16 having a double cutting or cutting edge, ie a right and a left cutting edge. The encoders are conventionally constituted by a plate having, as a non-critical example, a circular plane, of reduced thickness and provided with an unambiguous identification code which is activated in the presence of a signal, for example of the electromagnetic type. Preferably, the encoders or transponders 46 are placed in a stable manner in the chamber 44, held by any means to the opposite fronts thereof which define the internal bases of the case 14. According to a further feature of the invention, the trapspcp ± res or respapdadbces 46, 46 'ttttpt * ts in the cane 44, are aapatalJbt to each other by a plate 48, which is free to move inside the chamber, to fall by gravity and to tilt either against any of the transponders, of 4i £ ** * > - according to the positioning of the die 16 on the work table of the machine 12. The plate 48, which has a circular or polygonal plane and a limited height, is preferably manufactured from ferromagnetic material or iron alloy. During the operation stage, the dies 16 are placed on the work table 18 above the material to be cut. Depending on the positioning of the dies, the plate 48 is supported by the gravity on the ljumlr or patched: d = integral nansa cm the tia infiaa r of the case 14; In FIG. 3, plate 48 will rest on transponder 46 ', to be mounted on the miao and per capsigu? jspte pcotegerfo. The transponder 46 responds by means of flo the signal emitted by the ante10, at a frequency comprised, for example between 100 and 150 kHz, transmits its unambiguous code to the central unit 28 by means of the decoder 30; said signal is shown on the screen of the board 32 in the form of a figure or figures corresponding to the type of die used, also as in the form of initials or any other conventional reference to identify the right or left cut which will be carried out, depending on how the die has been positioned. The device directly detects the front part of the dies facing the ante10, integral with the ram 20 and points it to the operator by means of the screen of the board 32. This result is obtained in the previous programming of the device; 20 the individual operations 16, prsristcs cm éL esarhe 14 for the isolaspapdaces or tespx ß ± res 46, 46 ', are placed on the work table 18 of the punching machine 12. The electromagnetic code, not protected by the plate 46, charging by means of the ante10 and transmitting to the screen of the control board 32, its own identification code, which corresponds to the profile of the die 16 opposite that which is in contact with the material to be cut. Having made sure that the die * Á * Á is supported with the appropriate front part to form a right artifact, the opposite data - that is, the one that refers to the left artifact - is inserted in the panel of the board. The inverted sequence is due to the detection of the cutting edge of the die 16 which faces the work table 1, while the opposite transponder, oriented towards the antenna 10, such electromagnetic transponder or encoder 46 is not protected by the plate 48. The same operation is carried out after having rotated the die, which determines the protection or shielding by the plate 48 of the previously activated transpc. G. The programming, besides allowing to enter correctly this data for the formation of right or left artifacts, also allows introducing other data or values, referred to the size and type of the die. During production, the operator takes the die he deems appropriate to carry out the desired cut, places it on the work table and, by controlling the screen of control board 32, confirms that he has made the choice correct; if not, replace or rotate the die. In this way possible errors due to the accidental exchange of dies are avoided, as well as the risk of obtaining from the material to be cut right artifacts instead of left and vice versa. Obviously, in the case of dies with a single cutting edge, the case only contains a trapping 46 or 46 'and the use of plate 48 of shielding is not necessary. As can be inferred from the above, the advantages obtained by the invention are obvious. The device for cutting programmed by means of the dies of the present invention excludes the need to provide special containers with t,?, jétn &** "íji .. k # individual and specific holes for the many dies, since the last ones can not be confused Particularly advantageous is the possibility of carrying out quickly the control of the correct positioning of the dies on table 5 of work, and not obtain right artifacts instead of left, although a die of adequate size and development has been chosen. However, as described above and claimed hereinafter, the invention has been proposed only as a example, since it is susceptible to many changes and variants, which ^? 0 fall in any way the scope of the concept of the invention. For example, the antenna can be connected to the ram of the punching machine with means other than those described and illustrated by way of example and the possibility of installing two antennas on the same machine is not excluded, especially in type machines that have a carriage or other type. The case incorporating the electromagnetic encoder (s) may have any configuration and may possibly be attached to the inside of the edge of the die. Although the use of electromagnetic encoders of the read-only type is preferable, the use of encoders of type 20 reading script can not be excluded. In addition, the device of the present invention can be used in sectors other than those of the leather industry and shoe production in particular.

Finally, structural inversions or alternative positions for the cmponepts of the parts that form the device of the present invention as a whole are possible. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following fifteen twenty SrOiJ? t > if. •

Claims (10)

1. Claims 1 A device - * for cutting programmed by dies that is carried out with a digital technique and is applicable in particular to punching machines with a ram developed cantilevered over an Aujo g ± ffaaspbs table, cjt Ljni pt pnr | g ojip aife males pora < i *? pt- - vna univocal univocal ID signal from one or more encoders and / or connected to each of the dies, activated by the signal emitted by at least one integral antenna with the ram.
2. 2. The device according to claim 1, characterized in that the encoders are constituted by a lespcpfe ± r.
3. 3 The device ds uiifiMipkfed aan la reivifilirarim 1, < Does not admire or prpjT? the sign of idept ± E ac ±? n iiEf? Jvoca of the (s) transpcndar (s) or respcrdBC ± r (es) transíate to traes ds 15 a decoder to a central microprocessor having a data storage and is displayed on the screen of a control board from which the die cutting machine is provided, in the form of a numerical and / or alphanumeric reference.
4. 4. The device according to any of the preceding claims, characterized in that the üLjjq ui or electromagnetic encoder is integrated in a case which defines inside a chamber, integral with the internal or external edge of the dies.
5. 5. The device according to any of the preceding claims, 25 ear tM-iag to pnfe the eshrhe inpp? Prra? M rapaxrdac s r > r? trr & t z e? lttr »IGTR P.J, * "*" t ^ * which is located in a movable way, a camera, a plate of material # Ferromagnetic or iron alloy.
6. 6. The device according to any of the preceding claims, characterized in that the antenna is constituted by a coil having one or more windings, electrically fed by means of a cable and extending longitudinally along one side of the machine ram. , for a portion at least equal to the depth of the work table of the machine, the antenna is supported by a plate-like element.
7. 7. The device according to any of the preceding claims, which is designed to be installed in a plastic material such as nylon or the like and defines a substantially cylindrical configuration, with a lateral surface provided with a throat, developed along the entire perimeter of part thereof, suitable housing means for connecting the case to the inner or outer edge of the die.
8. 8. The device according to any of the preceding claims, characterized in that the means are constructed by a fork-shaped frame fixed in a fixed or movable manner to the edge of the die.
9. 9. The device according to any of the preceding claims, characterized in that the case incorporates a single «» .μ. Rtr or oespzd? R ± r. 25 ***, *, rt? v. ¿i »*» ,, * j ^^ íßlnk
10. 10. The confomiidad device with any of the preceding claims, characterized transpiers or responders of escptura / reading. The device according to any of the preceding claims, characterized in that the punching machine is of the type equipped with a carriage or a bridge. 15 20 25 «í? L