EP3031546A1 - Blanking unit - Google Patents
Blanking unit Download PDFInfo
- Publication number
- EP3031546A1 EP3031546A1 EP15199429.0A EP15199429A EP3031546A1 EP 3031546 A1 EP3031546 A1 EP 3031546A1 EP 15199429 A EP15199429 A EP 15199429A EP 3031546 A1 EP3031546 A1 EP 3031546A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- cam
- unit
- group
- cam follower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010008 shearing Methods 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000011265 semifinished product Substances 0.000 claims abstract 2
- 230000033001 locomotion Effects 0.000 claims description 11
- 239000002184 metal Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000015040 sparkling wine Nutrition 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 235000014101 wine Nutrition 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/06—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by positive or negative engaging parts co-operating with corresponding parts of the sheet or the like to be processed, e.g. carrier bolts or grooved section in the carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/06—Making more than one part out of the same blank; Scrapless working
- B21D28/08—Zig-zag sequence working
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/01—Means for holding or positioning work
- B26D7/015—Means for holding or positioning work for sheet material or piles of sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/026—Combination of two or more feeding devices provided for in B21D43/04 - B21D43/18
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/13—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by linearly moving tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F2001/3873—Cutting-out; Stamping-out advancing the material stepwise onto the work surface of the cutting machine
Definitions
- the present invention relates to a blanking unit, in particular to a blanking unit for a sheet material, for example metal sheet.
- the present invention finds a preferred, although not exclusive, application in a sheet blanking unit for the production of caps for the wine industry, which will be referred to in the following without any loss of generality.
- bottles of sparkling beverages e.g. sparkling wines
- stoppers made of cork or synthetic materials
- a shaped metal disc, or cap is normally interposed between the stopper and the cage.
- the cages, and in particular the caps, are manufactured in automatic machines with an extremely high cadence, thus requiring an optimization of the sheet feeding and of the arrangement of the shearing areas. A quick, accurate and repeatable positioning of the sheet is therefore essential.
- the shearing is generally carried out by means of a material-saving cycle comprising the steps of obtaining a first row of discs arranged side by side in a direction perpendicular to the sheet feeding direction and of obtaining a second row of discs staggered by half a step with respect to the previous row.
- This cycle usually comprises a step advancement of the sheet in its feeding direction and a lateral translation of the sheet, once longitudinally arranged. Both movements are controlled by respective electric motors.
- the sheet step advancement is generally carried out by thrust means, each time operating in the free sheared holes.
- the electric motors do not generally ensure a precise positioning of the sheet by varying the speed of the machine; therefore, errors can occur, in particular when the production starts again after a machine stop.
- the sheet feeding from just-sheared holes propagates to the subsequent rows any longitudinal positioning error of the sheet, thus determining a progressive accumulation of errors.
- the object of the present invention is to obtain a more precise positioning of the sheet and a better repeatability.
- Figure 1 shows a blanking unit 1 according to the invention, comprising a shearing machine 2 and a feeding group 3 of a metal sheet 4.
- the shearing machine 2 is arranged in a free space 5 of the feeding group 3.
- a set of three coordinate axes x, y, z comprises x which is a horizontal axis parallel to the plane of the sheet 4 and to the feeding direction of the sheet 4, y which is a horizontal axis parallel to the plane of the sheet 4 and orthogonal to the axis x, and z which is an axis perpendicular to x and y and parallel to the shearing direction.
- the shearing machine 2 comprises a support structure 6 comprising in turn a main vertical wall 7 parallel to the plane xz.
- the structure 6 further comprises a lower wall 8 projecting from the main wall 7, close to its lower end, and supporting a punch 9 having a fixed axis A parallel to the axis z and constituting the shearing axis.
- the structure 6 also comprises a pair of parallel vertical walls 11 extending from the wall 7 above the lower wall 8. The walls 11 support a pin 12 whose axis is parallel to the axis x on which a rocker arm 13 is articulated.
- An end 14 of the rocker arm 13 is coupled to an upper end of a hollow shaft 15, having an axis A, by means of a pin 16.
- the shaft 15 vertically slides along the axis A, in a support 17 fixed to the walls 11.
- the shaft 15 has an inner chamber 18 ( Figure 3 ) selectively connectable to a positive or negative pressure source.
- a lower end of the shaft 15 is coupled to a die 19, cooperating with the punch 9 and containing a stop rubber ring 21 for the sheared discs ( Figure 3 ).
- An opposite end 22 of the rocker arm 13 is coupled to a rod 23 by a pin 24.
- the rod 23 is vertically slidable within a support 25 integral with the main wall 7.
- the rod 23 carries a cam follower 26 driven by a cam, not shown, for operating the shearing machine 2.
- the feeding group 3 comprises two plates 27, 28 parallel to the plane xy, elongated in a direction parallel to the axis x and longitudinally spaced to define the space 5 between them.
- Each of the plates 27, 28 has a top surface 29 on which the sheet 4 and a lower surface 31 rest.
- the plates 27, 28 are rigidly coupled and are movable in a direction parallel to the axis y along a guide 32 fixed to the structure of the unit 1.
- the plate 27 carries a pair of cam follower 33, 34 cooperating with a cam 35 rotatable about an axis B parallel to the axis y and arranged below the plate 27.
- the cam 35 is defined by an annular rib radially projecting from a cylindrical body 36 and having a variable profile in the direction y, with which the cam followers 33, 34 cooperate on opposite sides so as to create a desmodromic control defining the law of motion 27, 28 of the plates in the direction y.
- the cylindrical body 36 is coupled through a grooved profile 37 to a shaft, for example a shaft of an electric motor, here not shown. Conveniently, this shaft also controls the actuating cam of the shearing machine 2 by means of a not shown synchronous transmission.
- the plate 28 carries a third cam follower 38 having a vertical axis cooperating with a cam 39 defined by a shaped opening 41 formed in a fixed plate 42, parallel to the plane xy and connected to the structure of the unit 1.
- the opening 41 is substantially parallelogram-shaped, with two bases 43, 44 parallel to each other and to the axis y and two oblique sides 45, 46.
- the oblique side 45 extends beyond the base 43 to form a guiding groove 50 provided with an oblique side 47, parallel to the oblique side 45, and an end portion 48 parallel to the bases and extending from the groove 50 on the side opposite to the bases.
- the opening 41 forms a loop 49 extending in the direction y beyond the oblique side 46.
- the oblique side 45 and the base 44 define as a whole a first edge 60a, whereas the oblique sides 46, 47 and the base 43 define as a whole a second edge 60b of the opening 41, the first and the second edges 60a, 60b defining the opening 41 along the direction x with opposite orientations.
- the cam follower 38 cyclically and continuously cooperates with the sides of the opening 41 as described hereinafter.
- the plate 27 ( Figure 5 ) carries a slide 51, prismatically engaged with the guide 32 to slide in the direction y.
- the plate 27 also carries an advancement mechanism 52 of the sheet 4 in the direction x.
- the mechanism 52 comprises a slide 53, slidably housed in a longitudinal seat 54 of the plate 27 and having a sequence of feeding teeth 55, each parallel to the direction y and equally spaced in the direction x by a step p equal to the advancement step of the sheet 4.
- the teeth 55 are vertically slidable within respective seats 56 of the slide 53 and are thrusted upwards by elastic means not shown to be able to protrude upwards relative to the slide 53 but to move back under the weight of the sheet 4.
- the mechanism 52 ( Figure 6 ) also comprises a feeding group 57 comprising in turn a block 58 sliding longitudinally in a guide 59 mounted in an end portion of the seat 54 on the opposite side with respect to the space 5.
- the block 58 integrally carries a thrusting tooth 61 cooperating with an end edge of the sheet 9 and a tooth 62 spaced from the tooth 61 by a step p and vertically retractable like the teeth 55.
- the block 58 is actuated by a pneumatic cylinder 63 to move longitudinally with a reciprocating rectilinear motion within the guide 59 during the loading stage of a new sheet 4, as it will be better described below.
- Permanent magnets 64 are arranged at the sides of the seat 54 to attract the sheet 4, thus keeping it in contact with the surface 29 of the plate 27.
- the mechanism 52 further comprises a pneumatic cylinder 65, housed below the plate 28 and provided with a rod 66 constrained to the plate 28, and a barrel 67 in which the rod is telescopically slidable in a direction parallel to the axis x; the barrel 67 is integral with a slide 68 movable along the axis x and driven by a pair of bars 71,72 parallel to said axis and engaging respective guides 73,74 integral with the plates 27, 28.
- a pneumatic cylinder 65 housed below the plate 28 and provided with a rod 66 constrained to the plate 28, and a barrel 67 in which the rod is telescopically slidable in a direction parallel to the axis x; the barrel 67 is integral with a slide 68 movable along the axis x and driven by a pair of bars 71,72 parallel to said axis and engaging respective guides 73,74 integral with the plates 27, 28.
- the bar 72 longitudinally extends until connecting to a block 69 fixed to the slide 53, which is therefore controlled by the cylinder 65.
- a side guiding device 75 of the sheet 4 is arranged on one side of the plate 27.
- the device 75 comprises ( Figures 4 and 6 ) a pair of levers 76, 77 pivoting on a support 81 fixed to the plate 27. Respective first arms 78, 79 of the levers 76, 77 are connected by the rod 82 of an air spring 83; respective second arms 84, 85 of the levers 76, 77 have respective rollers 86, 87 cooperating with a side edge 88 of the sheet 4 to keep an opposite side edge 89 in contact with a longitudinal guide 91 integral to the plate 27.
- Two projections 92 extending along the direction z are formed on the plate 28, close to the open space 5, and engage with corresponding holes 93 of the plate 4.
- the blanking unit 1 operates as follows.
- the cam 35 synchronously controls the lateral translation of the plates 27 and 28 along the direction y and the shearing machine 2 (through the transmission and the cam not shown).
- the cylinder 65 controls the longitudinal advancement of the sheet 4 to carry out a cycle comprising the following steps:
- the cam produces an alternative vertical translation of the shaft 23 which, through the rocker arm 13, drives the shaft 15 carrying the die 19. This latter, at each downward stroke, shears the sheet 4 placed between the die 19 and the punch 9.
- the sheared sheet discs remain attached to the rubber ring 21 due to the depression created in the chamber 18.
- a positive pressure is generated inside the chamber 18, so that the sheared disc is ejected and collected by a plate, not shown, which is cyclically interposed between the punch 9 and the die 19 and is part of a device transporting the sheared discs to a subsequent work station.
- the plate 4 Since the shearing occurs in a fixed position, the plate 4 must be moved both in the direction x and in the direction y.
- the sheet 4 is positioned on the plate 27 and constrained in the direction y by the contact with the guide 91 ensured by the rollers 86, 87 of the device 75.
- the sheet 4 is positioned above the teeth 62, 55, which retract under its weight, and with its own end edge 94 close to the tooth 61, so that this latter, when actuated by the cylinder 63, comes in contact with said end edge 94 and thrusts the sheet 4 in the direction x towards the space 5, thus defining a starting position of the working cycle.
- the handling of the sheet in the direction x and y is controlled by the cams 35 and 39.
- the rotating cam 35 controls, by means of the cam followers 33, 34, the translation along the axis y of the slide 51 and, therefore, of the whole group 3.
- the position of the slide 53 along the direction x is controlled by the interaction of the cam follower 38, actuated by the cylinder 65, with the opening 41.
- the cylinder 65 gives the cam follower 38 a movement in the direction x which, combined with the movement in the direction y of the whole group 3, determines a closed trajectory of the cam follower 38 along the periphery of the opening 41, followed cyclically and step-by-step.
- Figures 8a-8f and 9 show the effect of the combination of the movement between the cams 35 and 39.
- the shearing cycle starts from a position p101 of the cam follower 38, where the disc 101 is sheared.
- the sheet 4 is in contact with the tooth 61 and is blocked on the plate 27 by the magnets 64.
- the cylinder 65 thrusts the cam follower 38 while keeping it in contact with the oblique side 45 of the opening 41 and determining a translation in the direction x of the slide 53 in the direction opposite to the advancement of the sheet 4.
- the sheet 4 is restrained by the magnets 64 and by the projections 92 which prevent its movement while the slide 53 withdraws under the sheet 4 of a step p so as to allow the tooth 62 to come out of the sheet 4.
- the group 3 is moved in the direction y until the cam follower 38 reaches a new position p102 for shearing the disc 102; thereafter the group 3 is further moved in the direction y, without any movement in the direction x.
- the cam follower 38 reaches a position p103, the disc 103 is sheared. The first shearing series of three along the direction y is thus complete.
- the cylinder 65 drives the cam follower in the opposite direction, i.e. in the feeding direction of the sheet 4, while keeping it in contact with the oblique side 46 of the opening 41 while the cam 35 moves the group 3 in the direction y.
- the tooth 62 moves the sheet 4 in the feeding direction x by half a step.
- the cam follower 38 reaches a position p104, the disc 104 is sheared.
- the cam 35 moves again the group 3 until bringing it in a position p105 where the disc 105 is sheared.
- the second shearing series of two along the direction y is thus complete.
- the cam 35 moves the group 3 in the direction y, while the cylinder 65 keeps the cam follower 38 in contact with the side 47 of the opening 41.
- the tooth 62 further thrusts the metal sheet by half a step in the direction x.
- the cam follower 38 reaches again the cycle starting position p101 and the previously described operations are repeated.
- the sheet advances by one step p thanks to the intervention of successive teeth 55, each time exposed by the translation of the slide 53 in the direction opposite to the feeding direction.
- cams 35 and 39 may be differently manufactured, and the transmission of movement in the sheet direction x may be differently performed as well.
- the pneumatic cylinder 65 may be replaced by a different reciprocating linear actuator, electrical for example.
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- Details Of Cutting Devices (AREA)
Abstract
Description
- The present invention relates to a blanking unit, in particular to a blanking unit for a sheet material, for example metal sheet.
- The present invention finds a preferred, although not exclusive, application in a sheet blanking unit for the production of caps for the wine industry, which will be referred to in the following without any loss of generality.
- As already known, bottles of sparkling beverages, e.g. sparkling wines, are usually closed by means of stoppers made of cork or synthetic materials, retained on the neck of the bottle by metal wire cages. A shaped metal disc, or cap, is normally interposed between the stopper and the cage.
- The cages, and in particular the caps, are manufactured in automatic machines with an extremely high cadence, thus requiring an optimization of the sheet feeding and of the arrangement of the shearing areas. A quick, accurate and repeatable positioning of the sheet is therefore essential. The shearing is generally carried out by means of a material-saving cycle comprising the steps of obtaining a first row of discs arranged side by side in a direction perpendicular to the sheet feeding direction and of obtaining a second row of discs staggered by half a step with respect to the previous row.
- This cycle usually comprises a step advancement of the sheet in its feeding direction and a lateral translation of the sheet, once longitudinally arranged. Both movements are controlled by respective electric motors.
- The sheet step advancement is generally carried out by thrust means, each time operating in the free sheared holes.
- This known solution has two problems.
- The electric motors do not generally ensure a precise positioning of the sheet by varying the speed of the machine; therefore, errors can occur, in particular when the production starts again after a machine stop.
- Moreover, the sheet feeding from just-sheared holes propagates to the subsequent rows any longitudinal positioning error of the sheet, thus determining a progressive accumulation of errors.
- The object of the present invention is to obtain a more precise positioning of the sheet and a better repeatability.
- Said object is achieved by a blanking unit according to claim 1.
- For a better understanding of the present invention, a preferred embodiment is described hereinafter by way of a non-limiting example and with reference to the accompanying drawings, in which:
-
Figure 1 is a perspective view of a blanking unit according to the present invention; -
Figure 2 is a perspective view of a shearing machine of the unit ofFigure 1 ; -
Figure 3 is a cross-section of the shearing machine ofFigure 2 ; -
Figure 4 is a top perspective view of a sheet feeding group of the unit ofFigure 1 ; -
Figure 5 is a bottom perspective view of the group ofFigure 4 ; -
Figure 6 is a longitudinal section of the group ofFigure 4 ; -
Figure 7 is a top view of the sheet blanking carried out by the unit ofFigure 1 ; -
Figures 8a - 8f schematically show successive steps of the sheet feeding into the blanking unit ofFigure 1 ; and -
Figure 9 is a plan view of a cam driving the feeding group ofFigure 4 . -
Figure 1 shows a blanking unit 1 according to the invention, comprising ashearing machine 2 and afeeding group 3 of ametal sheet 4. Theshearing machine 2 is arranged in afree space 5 of thefeeding group 3. - For the sake of simplicity, a set of three coordinate axes x, y, z comprises x which is a horizontal axis parallel to the plane of the
sheet 4 and to the feeding direction of thesheet 4, y which is a horizontal axis parallel to the plane of thesheet 4 and orthogonal to the axis x, and z which is an axis perpendicular to x and y and parallel to the shearing direction. - Referring to
Figures 2 and3 , theshearing machine 2 comprises asupport structure 6 comprising in turn a mainvertical wall 7 parallel to the plane xz. Thestructure 6 further comprises alower wall 8 projecting from themain wall 7, close to its lower end, and supporting apunch 9 having a fixed axis A parallel to the axis z and constituting the shearing axis. Thestructure 6 also comprises a pair of parallelvertical walls 11 extending from thewall 7 above thelower wall 8. Thewalls 11 support apin 12 whose axis is parallel to the axis x on which arocker arm 13 is articulated. - An
end 14 of therocker arm 13 is coupled to an upper end of ahollow shaft 15, having an axis A, by means of apin 16. Theshaft 15 vertically slides along the axis A, in asupport 17 fixed to thewalls 11. Theshaft 15 has an inner chamber 18 (Figure 3 ) selectively connectable to a positive or negative pressure source. - A lower end of the
shaft 15 is coupled to adie 19, cooperating with thepunch 9 and containing astop rubber ring 21 for the sheared discs (Figure 3 ). - An
opposite end 22 of therocker arm 13 is coupled to arod 23 by a pin 24. Therod 23 is vertically slidable within asupport 25 integral with themain wall 7. At a lower end, therod 23 carries acam follower 26 driven by a cam, not shown, for operating theshearing machine 2. - Referring to
Figures 4 ,5 and6 , thefeeding group 3 comprises twoplates space 5 between them. Each of theplates top surface 29 on which thesheet 4 and alower surface 31 rest. Theplates guide 32 fixed to the structure of the unit 1. To this purpose, theplate 27 carries a pair ofcam follower cam 35 rotatable about an axis B parallel to the axis y and arranged below theplate 27. - The
cam 35 is defined by an annular rib radially projecting from acylindrical body 36 and having a variable profile in the direction y, with which thecam followers motion cylindrical body 36 is coupled through agrooved profile 37 to a shaft, for example a shaft of an electric motor, here not shown. Conveniently, this shaft also controls the actuating cam of theshearing machine 2 by means of a not shown synchronous transmission. - The
plate 28 carries athird cam follower 38 having a vertical axis cooperating with acam 39 defined by ashaped opening 41 formed in afixed plate 42, parallel to the plane xy and connected to the structure of the unit 1. With reference toFigures 5 and9 , theopening 41 is substantially parallelogram-shaped, with twobases oblique sides oblique side 45 extends beyond thebase 43 to form aguiding groove 50 provided with anoblique side 47, parallel to theoblique side 45, and anend portion 48 parallel to the bases and extending from thegroove 50 on the side opposite to the bases. Between thebase 44 and theoblique side 46, the opening 41 forms aloop 49 extending in the direction y beyond theoblique side 46. Theoblique side 45 and thebase 44 define as a whole afirst edge 60a, whereas theoblique sides base 43 define as a whole asecond edge 60b of theopening 41, the first and thesecond edges opening 41 along the direction x with opposite orientations. - The
cam follower 38 cyclically and continuously cooperates with the sides of the opening 41 as described hereinafter. - The plate 27 (
Figure 5 ) carries aslide 51, prismatically engaged with theguide 32 to slide in the direction y. - The
plate 27 also carries anadvancement mechanism 52 of thesheet 4 in the direction x. Themechanism 52 comprises aslide 53, slidably housed in alongitudinal seat 54 of theplate 27 and having a sequence offeeding teeth 55, each parallel to the direction y and equally spaced in the direction x by a step p equal to the advancement step of thesheet 4. - The
teeth 55 are vertically slidable withinrespective seats 56 of theslide 53 and are thrusted upwards by elastic means not shown to be able to protrude upwards relative to theslide 53 but to move back under the weight of thesheet 4. - The mechanism 52 (
Figure 6 ) also comprises afeeding group 57 comprising in turn ablock 58 sliding longitudinally in aguide 59 mounted in an end portion of theseat 54 on the opposite side with respect to thespace 5. Theblock 58 integrally carries a thrustingtooth 61 cooperating with an end edge of thesheet 9 and atooth 62 spaced from thetooth 61 by a step p and vertically retractable like theteeth 55. - The
block 58 is actuated by apneumatic cylinder 63 to move longitudinally with a reciprocating rectilinear motion within theguide 59 during the loading stage of anew sheet 4, as it will be better described below. -
Permanent magnets 64 are arranged at the sides of theseat 54 to attract thesheet 4, thus keeping it in contact with thesurface 29 of theplate 27. - The
mechanism 52 further comprises apneumatic cylinder 65, housed below theplate 28 and provided with a rod 66 constrained to theplate 28, and abarrel 67 in which the rod is telescopically slidable in a direction parallel to the axis x; thebarrel 67 is integral with aslide 68 movable along the axis x and driven by a pair ofbars respective guides plates - The
bar 72 longitudinally extends until connecting to ablock 69 fixed to theslide 53, which is therefore controlled by thecylinder 65. - A side guiding
device 75 of thesheet 4 is arranged on one side of theplate 27. Thedevice 75 comprises (Figures 4 and6 ) a pair oflevers support 81 fixed to theplate 27. Respectivefirst arms levers rod 82 of anair spring 83; respectivesecond arms levers respective rollers side edge 88 of thesheet 4 to keep anopposite side edge 89 in contact with alongitudinal guide 91 integral to theplate 27. - Two
projections 92 extending along the direction z are formed on theplate 28, close to theopen space 5, and engage with corresponding holes 93 of theplate 4. - The blanking unit 1 operates as follows.
- As already stated, the
cam 35 synchronously controls the lateral translation of theplates cylinder 65 controls the longitudinal advancement of thesheet 4 to carry out a cycle comprising the following steps: - shearing a first row of three
discs - longitudinally moving the
sheet 9 and shearing a second row of twodiscs holes teeth 55 and p/2 is at least equal to (d+g)/√2, where d is the diameter of the sheared discs and g is the distance defined above. - More in particular, with regard to the shearing
machine 2, the cam produces an alternative vertical translation of theshaft 23 which, through therocker arm 13, drives theshaft 15 carrying thedie 19. This latter, at each downward stroke, shears thesheet 4 placed between the die 19 and thepunch 9. - During the shearing operation, the sheared sheet discs remain attached to the
rubber ring 21 due to the depression created in thechamber 18. When theshaft 15 comes back to the rest position, a positive pressure is generated inside thechamber 18, so that the sheared disc is ejected and collected by a plate, not shown, which is cyclically interposed between thepunch 9 and thedie 19 and is part of a device transporting the sheared discs to a subsequent work station. - Since the shearing occurs in a fixed position, the
plate 4 must be moved both in the direction x and in the direction y. - The
sheet 4 is positioned on theplate 27 and constrained in the direction y by the contact with theguide 91 ensured by therollers device 75. Thesheet 4 is positioned above theteeth own end edge 94 close to thetooth 61, so that this latter, when actuated by thecylinder 63, comes in contact with saidend edge 94 and thrusts thesheet 4 in the direction x towards thespace 5, thus defining a starting position of the working cycle. - The handling of the sheet in the direction x and y is controlled by the
cams - The rotating
cam 35 controls, by means of thecam followers slide 51 and, therefore, of thewhole group 3. - The position of the
slide 53 along the direction x is controlled by the interaction of thecam follower 38, actuated by thecylinder 65, with theopening 41. Thecylinder 65 gives the cam follower 38 a movement in the direction x which, combined with the movement in the direction y of thewhole group 3, determines a closed trajectory of thecam follower 38 along the periphery of theopening 41, followed cyclically and step-by-step. -
Figures 8a-8f and9 show the effect of the combination of the movement between thecams cam follower 38, where thedisc 101 is sheared. Thesheet 4 is in contact with thetooth 61 and is blocked on theplate 27 by themagnets 64. Thereafter, thecylinder 65 thrusts thecam follower 38 while keeping it in contact with theoblique side 45 of theopening 41 and determining a translation in the direction x of theslide 53 in the direction opposite to the advancement of thesheet 4. Thesheet 4 is restrained by themagnets 64 and by theprojections 92 which prevent its movement while theslide 53 withdraws under thesheet 4 of a step p so as to allow thetooth 62 to come out of thesheet 4. - At the same time, the
group 3 is moved in the direction y until thecam follower 38 reaches a new position p102 for shearing thedisc 102; thereafter thegroup 3 is further moved in the direction y, without any movement in the direction x. When thecam follower 38 reaches a position p103, thedisc 103 is sheared. The first shearing series of three along the direction y is thus complete. - Now the
cylinder 65 drives the cam follower in the opposite direction, i.e. in the feeding direction of thesheet 4, while keeping it in contact with theoblique side 46 of theopening 41 while thecam 35 moves thegroup 3 in the direction y. During this operation, thetooth 62 moves thesheet 4 in the feeding direction x by half a step. When thecam follower 38 reaches a position p104, thedisc 104 is sheared. - The
cam 35 moves again thegroup 3 until bringing it in a position p105 where thedisc 105 is sheared. The second shearing series of two along the direction y is thus complete. - In a final step of the cycle, the
cam 35 moves thegroup 3 in the direction y, while thecylinder 65 keeps thecam follower 38 in contact with theside 47 of theopening 41. During this operation, thetooth 62 further thrusts the metal sheet by half a step in the direction x. Thecam follower 38 reaches again the cycle starting position p101 and the previously described operations are repeated. - With each successive cycle, the sheet advances by one step p thanks to the intervention of
successive teeth 55, each time exposed by the translation of theslide 53 in the direction opposite to the feeding direction. - The foregoing description clearly shows the advantages obtained by means of the blanking unit according to the present invention. In particular, by handling the sheet starting from one of its end edges, any position error occurred by shearing a disc does not propagate to all subsequent discs. Moreover, the use of a cam control allows a higher precision than the use of electric motors.
- It is clear that this exemplary embodiment may be subject to modifications or variations that fall within the scope of protection defined by the claims. For example, the
cams pneumatic cylinder 65 may be replaced by a different reciprocating linear actuator, electrical for example.
Claims (13)
- A blanking unit (1) for manufacturing semi-finished products sheared from a sheet (4) comprising a shearing machine (2) defining a vertical shearing axis (A) and a handling group (3) of said sheet (4) to advance it in a first feeding direction and displace it in a second direction transversal to the first direction to define a sequence of shearing positions (p101, p102, p103, p104, p105), characterized in that said group (3) comprises a step advancement mechanism (52) of said sheet (4) in said first direction, controlled by a cam and acting on an end edge (94) of said sheet (4), and a mechanical cam control (33, 34, 35) for handling said sheet (4) in said second direction.
- A unit (1) according to claim 1, characterized in that said mechanical control (33, 34, 35) is desmodromic and comprises a rotating cam (35) and a pair of cam followers (33, 34) integral with said group (3) and cooperating on opposite sides with said cam (35).
- A unit (1) according to claim 1 or 2, characterized in that said advancement mechanism (52) comprises at least one plate (27) defining an advancement plane of said sheet (4) and a feeding device moveable with respect to said plate (27) with a reciprocating motion in said first direction, said feeding device comprising thrust means adapted to unidirectionally cooperate with said end edge (94) of the sheet (4) in said feeding direction of the same.
- A unit (1) according to claim 3, characterized in that said advancement mechanism (52) comprises a fixed cam (39) and a cam follower (38) integral with said feeding device, said cam follower (38) being configured to follow the profile of said cam (39) thanks to the motion of said group (3) in said second direction.
- A unit (1) according to claim 4, characterized in that said cam (39) comprises an opening (41) engaged by the cam follower (38), said profile of said cam (39) being defined by a plurality of sides (43, 44, 45, 46, 47, 48) of the cam (39) against which said cam follower (38) slides.
- A unit (1) according to claim 5, characterized in that it comprises a reciprocating linear actuator (65) interposed between said group (3) and said cam follower (38) for varying the position of said cam follower (38) with respect to the group (3) in said first direction.
- A unit (1) according to claim 6, characterized in that said linear actuator (65) can take a first position in which the cam follower (38) is pushed into contact with a first edge (60a) delimiting the opening (41) in said first direction with a first orientation, and a second position in which the cam follower (38) is pushed into contact with a second edge (60b) delimiting the opening (41) in said first direction with a second orientation.
- A unit (1) according to claim 7, characterized in that each of said edges (60a, 60b) comprises a base (43, 44) parallel to said second direction and at least one oblique side (45, 46, 47), the contact of the cam follower (38) with said oblique sides (45, 46, 47) determining a translation of the feeding device in said first direction, the contact of the cam follower (38) with said bases (43,44) allowing a translation of said group (3) in said second direction.
- A unit (1) according to any one of claims 3-8, characterized in that said feeding device comprises a slide (53), said thrust means comprising a plurality of teeth (55) cooperating in sequence with said edge (94) of said sheet (4), said teeth (55) being moveable between an extended feeding position and a retracted rest position under the weight of said sheet (4) and against the action of said elastic retaining means.
- A unit (1) according to any one of the preceding claims, characterized in that said group (3) comprises a group (57) feeding said sheet (4) to said feeding device controlled by a reciprocating linear actuator (63).
- A unit (1) according to any one of the preceding claims, characterized in that said group (3) comprises a plurality of magnets (64) retaining said sheet (4) on said plate (27) during the stroke of said feeding device with an opposite orientation with respect to the feeding orientation of the sheet (4).
- A unit (1) according to any one of the preceding claims, characterized in that said group (3) comprises a side guiding device (75) of the sheet (4) comprising a fixed guide (92) and thrust means operating on said sheet (4) to keep it in contact with said fixed guide (91).
- A unit (1) according to claim 12, characterized in that said thrust means comprise an air spring (83).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO20141025 | 2014-12-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3031546A1 true EP3031546A1 (en) | 2016-06-15 |
EP3031546B1 EP3031546B1 (en) | 2019-03-13 |
Family
ID=52727300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15199429.0A Active EP3031546B1 (en) | 2014-12-10 | 2015-12-10 | Blanking unit |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3031546B1 (en) |
ES (1) | ES2716683T3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111957810A (en) * | 2020-07-08 | 2020-11-20 | 四川晶辉半导体有限公司 | Punching and stacking equipment for optocoupler supports |
CN112355228A (en) * | 2020-10-16 | 2021-02-12 | 徐在华 | Rivet automatic discharging equipment for parts machining |
IT201900016766A1 (en) * | 2019-09-19 | 2021-03-19 | Cebi Hi Tech S R L | Belt pulling unit for perforated fin molding machine, in particular for heat exchangers, with controlled adaptability to holes of different diameters. |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB152517A (en) * | 1919-10-15 | 1920-10-21 | Rudolf Stuebgen | Improvements in automatic feeding devices for presses, punching machines and the like |
US4506574A (en) * | 1983-01-26 | 1985-03-26 | Kabushiki Kaisha Komatsu Seisakusho | Zigzag feeder for blanking machine |
US4708043A (en) * | 1985-08-07 | 1987-11-24 | The Cly-Del Manufacturing Company | Adjustable cam indexing feed apparatus |
EP0616861A1 (en) * | 1993-03-26 | 1994-09-28 | ALFONS HAAR Maschinenbau GmbH & Co. | Table-and feeding system for presses |
-
2015
- 2015-12-10 EP EP15199429.0A patent/EP3031546B1/en active Active
- 2015-12-10 ES ES15199429T patent/ES2716683T3/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB152517A (en) * | 1919-10-15 | 1920-10-21 | Rudolf Stuebgen | Improvements in automatic feeding devices for presses, punching machines and the like |
US4506574A (en) * | 1983-01-26 | 1985-03-26 | Kabushiki Kaisha Komatsu Seisakusho | Zigzag feeder for blanking machine |
US4708043A (en) * | 1985-08-07 | 1987-11-24 | The Cly-Del Manufacturing Company | Adjustable cam indexing feed apparatus |
EP0616861A1 (en) * | 1993-03-26 | 1994-09-28 | ALFONS HAAR Maschinenbau GmbH & Co. | Table-and feeding system for presses |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201900016766A1 (en) * | 2019-09-19 | 2021-03-19 | Cebi Hi Tech S R L | Belt pulling unit for perforated fin molding machine, in particular for heat exchangers, with controlled adaptability to holes of different diameters. |
EP3795270A1 (en) * | 2019-09-19 | 2021-03-24 | CEBI HI-Tech s.r.l. | Belt drive unit for a molding machine of bored fins, in particular for heat exchangers, with controlled adaptability to bores of different diameters |
US11530105B2 (en) | 2019-09-19 | 2022-12-20 | Cebi Hi-Tech S.R.L. | Belt drive unit for a molding machine or bored fins, in particular for heat exchangers, with controlled adaptability to bores of different diameters |
CN111957810A (en) * | 2020-07-08 | 2020-11-20 | 四川晶辉半导体有限公司 | Punching and stacking equipment for optocoupler supports |
CN112355228A (en) * | 2020-10-16 | 2021-02-12 | 徐在华 | Rivet automatic discharging equipment for parts machining |
CN112355228B (en) * | 2020-10-16 | 2022-04-19 | 东莞市天业塑胶电子有限公司 | Rivet automatic discharging equipment for parts machining |
Also Published As
Publication number | Publication date |
---|---|
ES2716683T3 (en) | 2019-06-14 |
EP3031546B1 (en) | 2019-03-13 |
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