US3282141A

US3282141A - Guillotine shearing machines

Info

Publication number: US3282141A
Application number: US439137A
Authority: US
Inventors: Gautron Raymond
Original assignee: Corpet Louvet et Cie
Current assignee: Corpet Louvet et Cie
Priority date: 1964-03-13
Filing date: 1965-03-08
Publication date: 1966-11-01
Anticipated expiration: 1983-11-01
Also published as: FR1390569A

Description

Nov. 1, 1966 R. GAUTRON 3,282,141

GUILLOTINE SHEARING MACHINES Filel March 8, 1965 5 Sheets-Sheet 1 Nov. 1, 1966 R. GAuTRoN GUILLOTINE SHEARING MACHINES 3 Sheets-Sheet 2 Filed March 8, 1965 'Nov. 1, 1966 R. GAu'rRoN 3,282,141

GUILLOTINE SHEARING MACHINES Filed March 8, 1965 3 Sheets-Sheet 5 A772777 e g4- United States Patent Odice dlldl Patented Nov. l, 1966 3,282,141 GUILLOTENE SHEARING MACHINES Raymond Gautron, La Courneuve, France, assignor to Corpet, Louvet & Cie, La Courneuve, France, a corporation of France Filed Mar. 8, 1965, Ser. No. 439,137 Claims priority, application France, Mar. 13, 1964, 967,397, Patent 1,396,541; 967,398, Patent 1,396,542 6 Claims. (Cl. 233-527) The present invention relates to guillotine shearing machines, and'in particular to a construction of a [guillotine with adjustment of clearance between blades, together with adjustment of inclination of the moving blade.

It is more particularly concerned with means for ensuring, in a guillotine of this type, a rapid adjustment of Ithe clearance between blades as compared with the usual adjustment necessitating a horizontal displacement of the table carrying the Xed blade on the :frame of the machine, which is a laborious and difficult operation.

It also relates to means for ensuring synchronization of the control of adjustment of the clearance between blades and of that of inclination of the moving blade, this being advantageous in that it concerns twoadjustments which depend on the thickness of the metal sheet to be cut.

The invention also -concerns an arrangement in a guillotine of this kind intended to permit, when so required, a possible and correct notching action which does not imply any particular pre-caution or adjustment. g

By the term notching it is intended to mean the operation making use of a blade arranged -transversely on the blade carrier -at the extreme end of the cut of the main blade and co-operating with a xed element on the rnachine, the notching blade permitting the sheared cutting to be detached on sheets having a length great-er than the capacity of the machine, or alternatively to carry out various rectangular cuts.

In the known constructions of guillotine shears having a blade carrier with :adjustable inclination, this latter adjustment depends on `the thickness Aof the sheet to be cut, the inclination of the blade-carrier affecting the clearance of the notching cut and involving either operational necessities in the case of notching or incorrect execution of the notching for at least a part off the range olf thicknesses of sheets within the capacity of the machine, all these disadvantages being avoided by the application of the present invention.

In accordance with a characteristic feature of the invention, a guillotine shear having adjustment of the blades, the movable blade-carrier being mounted laterally on slides, each slide is pivotally mounted at its upper part on a pivotapin coupled to the frame, and at its lower part on a pivot having an eccentric mounting 4axis which is pivotally mounted on the frame and adjustable in angular position according to the clearance desired between blades, the slide having for this purpose at its upper portion a sliding mounting with respect to the pivot-pin first mentioned above.

ln addition, the eccentric mounting shaft referred to is mounted on the frame with the interposition of an eccentric pivot also adjustable in angular position with an amplitude of -adjustment greater than that permitted by the said eccentric shaft, which only covers the adjustment of the clearance corresponding to the thickness of the sheet to be cut.

A'turther characte-ristic feature of 4the invention resides, as previously indicated, in a device intended to synchronize the control of the regulation of the clearance between blades and that of the inclination of the moving blade, this device comprising on a shaft for adjusting the clearance between blades adjustable angularly, a pulley on which is attached and wound a cable passing also over at least one pulley mounted on the moving blade-carrier Iso as to be variable in position according to the inclination of the corresponding blade, this cable being furthermore coupled to a holding device under tension and carrying and operating device cooperating in both directions with members Xed in position and ensuring the control of the inclination of the moving blade in one direction or the other in response to that of the ladjustment of the clearance between blades, and between which the control member is normally placed and is reset when the inclination of the moving blade corresponding to the desired clearance between blades has been obtained.

Another characteristic of the invention in a guillotine shear with a blade-carrier adjustable in inclination and further provided with a notching blade, reside-s in that the blade-carrier is provided, on the side of the notching blade, with a vertical later-al guide which leaves it the freedom of pivoting in this guide and ensures a pre-determined cutting cica-rance between the blade and the notching unit.

:Examples of construction of guillotine shearing machines according to the invention .are described below Without any implied limitation, reference being made to the accompanying drawings, in which:

FIG. l is a diagrammatic view from the front illustrating the mounting of the blade-carrier of a guillotine according to the invention, the structure located in front of the blade-carrier being removed;

FIG. 2 is a detail view to a larger scale of the mounting of a slide of the blade-carrier on the adjacent upright of the frame;

FIG. 3 is a view of the guillotine in transverse section, taken along the line III-III of FIG. 2;

FIG. 4 is a diagram illustrating the adjustments permitted by the mounting of the slides as shown;

FIG. 5 is a diagrammatic view illustrating the principle of the above-mentioned synchronizing device;

FIG. 6 is a side view of a guillotine shear with the frame broken away behind the blade-carrier, showing a construction of the synchronizing device;

FIG. 7 is a partial front View of the synchronizing device shown in FIG. 6;

FIG. 8 is a general front view of a blade-carrier and its arrangement for the purpose of notching, the front portion of the guillotine being removed;

FIG. 9 is a detail view of the guide of the blade-carrier shown in FIG. 8;

FIG. lO is a detail view of the mounting of the bladecarrier corresponding to a cross-section taken along the line X-X of FIG. 8;

FIG. l1 is a diagram illustrating the conditions of obtaining a suitable cutting clearance for notching;

, FIG. l2 is a diagram indicating the clearance of the notching cut as a function of the inclination of the bladecarrier.

The guillotine shown diagrammatically in FIG. l comprises a frame including a table 1, carrying a xed blade 2., and on each side of which are provided two uprights 3 between which is arranged, movable in height, a bladecarrier 5 provided at its lower portion with the blade 6 intended to co-operate with the blade 2.

The blade-carrier 5 is mounted laterally on two slides 7 through the intermediary of guiding members 8 ensuring the sliding without play of the blade-carrier in its plane, it being understood that the blade-carrier can be differently directed in the plane considered, depending on the inclination which it is desired to give to the moving blade 6.

The inclination of the slides is in this case adjustable according to the desired cutting clearance between the

blades

6 and 2.

As can be seen in detail from FIGS. 2 and 3, each slide is pivotally mounted at its upper portion about a pivot 10 mounted rigidly on the upright 3 of the frame and also slidable by means of an elongated hole 11 engaging a slide 12 mounted on the pivot 10 which forms the pivotal center.

At its lower portion, each slide is mounted on a pivot pin 13 having an eccentric mounting shaft 14 which is pivotally fixed on the frame. This shaft 14 is adjustable in angular position, in this case by means of a handwheel 15 driving a shaft 16 extending between the uprights 3 of the frame which support it, and at the extremities of which are provided two pinions 17 each coupled by a chain to a pinion 18 keyed on the shaft 14. yThe unit constituted -by the handwheel 15 and shaft 16 can be locked for rotation in any usual manner with respect to the frame. v

Thus, the eccentricity A of the shafts of the pivots 13 and the eccentricity B of the mounting shafts 14 enables the inclination of the slides 7 pivoting slidably about the pivot pins 10 to be regulated by means of the handwheel 15, that is to say the cutting clearance is adjusted between the moving blade 6 and the blade 2. It is recognized that this clearance must be substantially equal to 5% of the thickness of the sheet to be cut.

This adjustment of the shearing clearance by variation of inclination of the slides is independent of their mean permanent inclination indicated by z' in FIG. 3, and corresponding to an inclination of the attack trajectory of the moving blade recognized as necessary to obtain a square cut, this inclination being only slightly affected by the adjustment of the clearance between blades.

The eccentricity of the axes A-and B is preferably chosen as small as possible in order to permit the obtaining of the desired range of adjustment of the shearing clearance necessitated solely by the variations in thickness of the sheets to be cut, at the same time ensuring that the variation of the shearing clearance is substantially proportional to the angular movement of thehandwheel 15, that is to say only a small portion of the possible angular displacement of A around B is utilized, limited for example to the arc A1, A2 as illustrated on a large scale in FIG. 4. This arrangement makes it further possible to obtain a certain irreversibility of the horizontal cutting reactions and it necessitates only a small operating force on the handwheel 15.

In addition, in order to take into account more particularly the different thicknesses of blade possible and and their variations in thickness due to resharpening, there is then provided in the mounting of the shaft 14 on the frame the interposition of an eccentric pivot pin 20 having its axis at C, which is mounted with an adjustable angular position on the frame.

To this end, the pivot pin 20 is in this case provided with a notched head at 21 permitting its engagement by a key, and it can be locked on the frame through the intermediary of a locking ring 22 with a fixing screw 23. Taking account of this division of the adjustments, the eccentricity of the axes B and C is substantially greater than that of the axes A and B, the eccentric pivot 20 permitting for example, as can be seen from FIG. 4, an amplitude of adjustment d (positions B, B1) while there is shown at r that which is normally permitted by the adjustment of the shaft 14.

In practice therefore, the adjustment of the eccentric pivot 20 will enable the clearance of given blades to be adjusted to a zero value or to the desired minimum value, while the adjustment of the shaft 14 will permit the sheering clearance to be adjusted according to the thickness of the sheets to be cut, this latter adjustment being obviously much more frequent than the other and thus made more convenient by means of the handwheel 15.

Furthermore, in association with the adjustment of the eccentric pivot 20, there can be provided on adjustment of the upper pivot 10 in order to permit an alignment of the two slides 7 with respect to each other, in order that their sliding faces may be contained in the same plane (the plane of the trajectory of movement of the blade-carrier 5). This adjustment can be obtained by providing for the pivot pin 10 an eccentric mounting 101 (see FIG. 2) which is in turn also adjustable in angular position on the frame and can be locked by means of a ring 24.

As has already been stated, a device is provided to ensure synchronization of the adjustment control of the clearance between blades, similar to that previously ensured by means of the hand-wheel 15, and of the adjustment cont-rol -of the inclination of the moving blade 6 and therefore of the blade-carrier 5. This adjustment of inclination can be ensured in various known ways, by means of a servo-mechanism of which only the control members proper which are concerned with the synchronization device will be shown in the description which follows. By way of indication, this adjustment can be effected in this case by variation of the positions on the frame of the

jacks

25 and 26 intended for the upand-down operation of the blade-carrier, yand against which this latter is normally forced by an intermediate restoring jack 27 (see FIG. l).

In its principle, the above-mentioned synchronization `device is shown diagrammatically in FIG. 5, in which 161 indicates the shaft angularly adjustable according to the desired clearance betweenl blades (like the shaft 16 previously) and in which 51 represents the blade-carrier adjustable in inclination (angle e).

On the shaft 161 is keyed a pulley 30, on which is attached and wound at 31 a cable 32 which then passes over two

pulleys

33 and 34 fixed to the two extremities of the blade-carrier 51, this cable being kept under tension on the said pulleys by a device attached to its free extremity, in this case shown in the form of a spring 35. In the vicinity of this latter extremity, the cable carries a double cam 36 which is normally located between

electric control contacts

37 and 38, respectively intended to actuate the servo-mechanism for the inclination adjustment of the moving blade, one in the `direction of increase and the other for the decrease of the inclination e.

In this intermediate position, the double cam 36 cooperates with a stop contact 39 intended, when it is actuated, to interrupt any variation of inclination previously initiated by means of either of the

control contacts

37 or 38. The cable passes over the

pulleys

33 and 34 so that these are located on each side of it, which results in this case that the vertical working movement of the blade-carrier 51 leaves the double-cam 36 practically in any position, the cable disposed between the pulleys 30 'and 33 then varying in length inversely with respect to the length between the pulley 34 and the tensionmaintaining spring 35.

However, in the case of modification of adjustment of the shearing clearance necessitated by a change in the thickness yof the sheet to be cut, for example a reduction of thickness corresponding in this case to an angular displacement m of the shaft 161 in the direction indicated by the arrow, the spring 45 tensioning the cable 32 then causes the double-cam 36 to move towards the position indicated in dotted lines, taking account of the portion of cable unwound from the pulley 30.

In this displacement, the double-cam 36 actuates however the control contactor 38 responsible for the Ato the rear of the blade-carrier 5.

release of the inclination variation of the blade-carrier, that is to say in this case the reduction of inclination associated with the reduction of thickness of the sheets considered. The blade-carrier 51 is thus brought lower down as far as the position shown in chain-dotted lines, in which the double-cam will again be brought back to the operating position of the stop contact 39, thus inter rupting the inclination variation previously initiated.

In practice, this contact 39 may be a switch ensuring the interruption of two holding control circuits respectively established through the

control contacts

37 and 38, actuated by the passage of the double-cam 36.

As the distance L between centers of the pulley 34 in its two positions shown is substantially equal to the length of cable unrolled from the pulley 30 during the angular movement m, it can readily be seen that the adjustment of inclination of the blade-carrier can thus be coupled in any desired manner to the adjustment of the clearance between blades by a suitable choice of the pulley 3u.

Assuming furthermore that the mouting of the cable is such that it is not absolutely unaffected by the vertical movement of the blade-carrier during cutting, it can be seen that the adjustment control circuit described can be neutralized during the working phase of the guillotine.

FIGS. 6 and 7 illustrate `an example of construction of this control device for a guillotine shearing machine such as that previously described, in which the pulley 301 to which is attached the cable 321 is keyed on the shaft 16 which is provided with the operating handwheel for adjusting the clearance between blades and located On `a bracket 40, also arranged behind the blade-carrier 5 and at its two extremities, are mounted the

pulleys

331 and 341 over which passes the cable which -then extends over a set of return pulleys 41, 42 and 43, the spindles of which are iixedly mounted on the frame of the guillotine, while at the free extremity of the cable is attached a counter-weight 351.

On the cable is arranged a double-cam 361 co-operating Ias previously explained in the case of FIG. 5, with the

control contacts

371 and 381 and a stop contact 391.

FIGS. 8 to 12 illustrate the arrangement intended to permit notching in the case of la guillotine shown in a simplified manner, and in which the constituent parts equivalent to those of the preceding machine are indicated on the drawing by the same'reference numbers.

On the blade-carrier 5 there is fixed, at the extremity of the effective cut of the moving blade 6 and transversely to this latter, a notching blade 53 intended to co-0perate with a notching block 54 fixed on the ta'ble of the machine.

The blade-carrier S is provided at the side of the notching blade, 53, with a lateral vertical guide, in this case constituted by 'a roller 55 coupled to the bladecarrier and engaged in a rolling track 56 fixed to the adjacent upright 3 of the frame of the machine.

The roller is carried by a forked member 57, the arms of which freely span the rolling track 56, this forked member 5'7 being fixed on a bracket 58 mounted on the rear of the blade-carrier 5.

An arrangement of this kind simultaneously permits the blade-carrier 5 to retain the freedom of pivoting in this guide and to obtain a predetermined cutting clearance between the blade l53 and the notching block 54 in consequence of the trajectory imposed on the corresponding extremity of the blade-carrier during cutting, by the roller 55 rolling in the track 56.

This predetermined clearance can thus be maintained constant, that is to say uneffected by the inclination of the blade-carrier, on condition that, when looking on the blade-carrier from the front, the axis of the roller 55 is in the vicinity of the cutting edge G of the notching blade.

In additionv however, it is even possible to obtain very simply a variation of the cutting clearance for notching adapted to the thickness of the sheets to be cut, for which the inclination of the blade-carrier is adjusted, and this by means of a certain geometric arrangement of the spindle of the roller 55 with respect to the cutting edge of the notching blade G, which is illustrated in FIG. ll.

In this latter figure, when looking at the blade-carrier 5 from the front, the spindle of the roller 55 is shown at 0, while there are shown at G1 and G2 the positions takenup, in comparison with that of the roller, by the cutting edge of the notching blade for the extreme inclinations of the blade 6, namely I0 for the zero inclination and Im for the' maximum inclination, provided in this case as being equal to 3, which value is given solely by way of indication.

In this diagram, R represents the frontal distance from the axis of the roller to the cutting edge, while D corresponds to the variation of the cutting clearance for notching which should preferably be made to increase with the inclination of the blade, since this latter is itself taken to increase with the thickness of the sheets to be cut.

To this end, the mounting of the roller is such that the plane joining the axis of the roller to the cutting edge of the notching blade is inclined downwards with respect to this latter, OG1 making in this case the acute angle L1 with the horizontal and OGZ making the acute angle L2.

This can be expressed as follows:

D=R cos L2-R cos L1 and since D=Rrc0s L2-c0s (L2+3) j (1) For example, in the case of a guillotine designed to cut a'maximum thickness of sheet of l5 mm., taking into account that it is advisable to adopt a shearing clearance equal to about 5% of the thickness of the sheet to be cut (a value consecrated by use) and for a distance R equal to mm., the Equation 1 above becomes:

the solution of this equation being L2=10 and therefore L1=13.

On such a basis, FIG. l2 gives in its diagram an idea of the clearance obtained between notching blades expressed as ordinates in mm. as a function of the inclination I of the blade-carrier expressed as abscessae in degrees, and under which are expressed, on line E, the thicknesses of sheet corresponding, indicated in mm. and below the percentage of this thickness, represented by the clearance thus obtained, it being noted that it does not depart from the above-mentioned average except for small thicknesses of sheet (less than 2mm.) in particular, since it then remains necessary to reserve a minimum cutting clearance.

In the case of the adjustment previously described of the clearance between the main blades 2 and `6 by displacement of the guides of the blade-carrier, it is only necessary to leave the support of the roller `55, as pro vided in this case, the necessary freedom of movement with respect to the rolling track 56.

The invention may of course be given various forms of construction other than those described above.

What I claim is:

1. A guillotine shearing machine with adjustment of ing to the clearance desired between blades, an eccentric pivot mounted'on said frame and bearing thereon said eccentric mounting shaft, said eccentric pivot being adjustable in angular position with an amplitude of adjustment greater than that permitted by said eccentric shaft, each said slide having for that purpose a sliding mounting at its upper end about the rst pivot pin.

2. A guillotine shearing machine in accordance with claim 1, characterized in that it comprises a device intended to synchronize the control of adjustment of the clearance between blades and a control of inclination of the moving blade and comprising, on a shaft for adjustment of clearance between blades, adjustable angularly, a pulley on which is attached and wound a cable which also passes over two pulleys mounted on the moving blade carrier so as to be variable in position, depending on the inclination of the corresponding blade, said cable being furthermore connected to a tensionmaintaining device and carrying a control member cooperating in both directions with members fixed in position and ensuring the control of the inclination of the moving blade in either direction in response to that of the adjustment of the clearance between blades, and between which said control member is normally placed and is re-set when the inclination of the moving blade corresponding to the clearance adopted between blades has been reached.

3. A guillotine shearing machine in accordance with claim 1, characterized in that the pivot pin of the upper portion of each slide comprises an eccentric mounting shaft adjustable in angular position on the frame.

4. A guillotine shearing machine in accordance with claim 1, comprising a blade-carrier with adjustable inclination provided with a notching blade arranged at the end of cut of the main blade and transversely thereto,

and co-operating with a notching block fixed on the machine, characterized Vin that, on the side of the notching blade, the blade-carrier is provided with a lateral vertical guide which leaves it the freedom of pivoting in this guide and ensures a predetermined cutting clearance between the blade and the notching block.

5. A guillotine shearing machine in accordance with lclaim 4, characterized in that the guide is constituted by a roller coupled to the blade-carrier and engaged in a rolling track rigidly fixed to the frame of the machine.

6. A guillotine shearing machine in accordance with claim 5, characterized in that said roller is coupled to the blade-carrier by a support such that the plane joining the axis of the `roller and the cutting edge of the notching blade is inclined downwards with respect to said support, the inclination of this plane and the distance between the' roller axis and the cutting edge being such that the cutting clearance for notching is automatically adjusted in accordance with the thickness of the sheet to be cut for which the inclination `of the blade-carrier has been adjusted.

References Cited by the Examiner UNITED STATES PATENTS 2,574,501 11/1951 Seybold et al 83-527 X 2,605,836 8/ 1952 Messick 83-640 2,833,349 5/1958 Green 83-527 3,162,232 12/ 1964 Munschauer et a1. 83-640 X 3,181,407 5/1965 Pearson 83-640 X FOREIGN PATENTS 746,378 3/1956 Great Britain.

WILLIAM W. DWYER, JR., Primary Examiner.

J. M. MEISTER, Assistant Examiner.

Claims

1. A GUILLOTINE SHEARING MACHINE WITH ADJUSTMENT OF THE BLADES, COMPRISING A FRAME, SLIDE MEANS ON SAID FRAME, A MOVING BLADE CARRIER MOUNTED LATERALLY ON SAID SLIDES, A FIRST PIVOT PIN COUPLED TO THE FRAME AND PIVOTALLY MOUNTING THEREON THE UPPER PORTION OF EACH SAID SLIDE, A SECOND PIVOT PIN PIVOTALLY MOUNTING THEREON THE LOWER PORTION OF EACH SAID SLIDE, SAID SECOND PIVOT PIN HAVING AN ECCENTRIC MOUNTING SHAFT WHICH IS PIVOTALLY MOUNTED ON THE FRAME AND IS ADJUSTABLE IN ANGULAR POSITION ACCORDING TO THE CLEARANCE DESIRED BETWEEN BLADES, AN ECCENTRIC PIVOT MOUNTED ON SAID FRAME AND BEARING THEREON SAID ECCENTRIC MOUNTING SHAFT, SAID ECCENTRIC PIVOT BEING ADJUSTABLE IN ANGULAR POSITION WITH AN AMPLITUDE OF ADJUSTMENT GREATER THAN THAT PERMITTED BY SAID ECCENTRIC SHAFT, EACH SAID SLIDE HAVING FOR THAT PURPOSE A SLIDING MOUNTING AT ITS UPPER END ABOUT THE FIRST PIVOT PIN.