FR2505694A1 - DEVICE FOR ADJUSTING THE SHAPE FORM OF THE UPPER BLADE OF SWIVEL SHEARS HAVING A SWIVEL BLADE IN THE CASE OF A RIGID FASTENING OF THE BLADE - Google Patents

Abstract

THIS DEVICE INCLUDES A BLADE-HOLDER BAR 1 AND A BLADE 5, BETWEEN TWO SUPPORT PLATES 3, 4, EACH SIDE A FLAT SURFACE 3A, 4B AND ON THE OTHER A CURVED CONOID SURFACE 3B, 4A, THE SURFACES 3B, 4A BEING OPPOSITE, AND THE PLATES 3, 4 ARE PRESSED IN A SLOT 2 OF THE BAR 1, AND THE SURFACE 4B TAKES A CYLINDRICAL SHAPE TO WHICH THE BLADE 5 FITS. APPLICATION ESPECIALLY TO SYSTEMS FOR ADJUSTING THE SLIT BETWEEN INDUSTRIAL SHEAR BLADES.

Description

The invention relates to adjusting the curved shape

  by elastic deformation of the cutting edge of the

  upper blade of shears with a pendulum

  in the case of rigid attachment of the blade, which is achieved by means of support plates having

surfaces of appropriate shape.

  In industry, shears are frequently used

  the pendulum having a swivel blade Compared to other types of shears, the shears are characterized by the fact that the upper movable blade is attached to a blade bar that can pivot (tilt) about an axis of theoretical rotation The axis of rotation

  theoretical is parallel to the cutting edge of the lower blade.

  So that the cutting force is not too high, the upper blade is arranged by being curved with respect to the

  lower blade The curved disposition of the upper blade

  and the tilting movement have the effect that the cutting edge of the upper blade can not be rectilinear, and therefore it is necessary to give a curved shape

  to the upper blade It can thus be achieved that the

  te between the two blades is constant over the entire length

cutting.

  A solution of this type is known, according to which the blade is bent by tightening the latter, using fixing screws, on the blades.

  adjusting screws in the blade bar and in

  glue the shape of the upper blade using these screws by measuring the constant gap between the blades using a gauge of control The company known as Weinbrenner siseen

  Federal Republic of Germany uses such a solution.

  Besides, we know the solution of the society

  trichienne known as Voest Alpine, according to which one supports

  the upper blade with shoring plates in

  under the blade, plates or sets of plates of increasing thickness from the end of the blade towards its middle and which is obtained

  thus the corresponding curvature of the cutting edge of the blade.

  In these solutions, the blade is not rigidly fixed.

  in the first case, the upper blade rests almost punctually on the ends of the adjusting screws, while in the second case, the shoring plates are parallel

  and provide the blade with a staged support surface.

  As a result, on the one hand, there appears to be a

  high surface tension on the ends of the adjusting screws, which leads to a plastic deformation, and therefore the slot set between the blades can not be maintained, and that the other blade is bent, in its section included between the adjusting screws and the stepped support surfaces, under the action of the cutting force, and thus it appears additional stresses in the blade and also the quality of the cutting surface decreases. In the case of the solution of the so-called society

  Voest Alpine, the regulation of the necessary form of la-

  still involves me an additional difficulty since, as a result of machining inaccuracies of the blade

  upper and lower blade, the thickness of the

  necessary shoring can not be determined from

Precise way in advance.

  The object of the present invention is to provide

  such a rigid attachment of the blade, which allows the

  glage of the desired curved shape of the cutting edge of the

  so that the differences in form resulting from

  machining details of the upper blade and the inner blade

  can also be compensated, which keeps the gap between the blades constant

cutting length.

  The invention is based on the fact that, in the case of a rigid attachment of the upper blade, obtained by means of support plates having a conoidal surface, it is

  possible to modify the shape of the cutting edge of the blade

  in order for the latter to place on an over-

continuous cylindrical face.

  The above-mentioned purpose is achieved by the fact that two congruent support plates, one face having a flat surface and the other side having a curved conical surface, are arranged between the blade bar and the upper blade so that 'they are vis-à-vis by

  their curved surfaces, so that the direc-

  conoldes are located on the antipodal

  that the support plates thus assembled are

  against the flat surface of the groove of the blade,

  swam in the bar door-lae, thanks to which the surface su-

  The upper part takes the desired cylindrical shape and the blade is placed on this cylindrical shape in such a way

  that it is attached to the blade bar - through the

  re support plates by means of a detachable connection,

  preferably by means of screw connections.

  The modification of the shape of the cutting edge of the blade can be obtained by means of the displacement of the support plates one over the other in a parallel or oblique direction.

  appropriate using a double eccentric.

  Other features and advantages of the pre-

  The invention will become apparent from an embodiment described hereinafter with reference to the accompanying drawings, in which:

  Figure 1 shows the main arrangement

  eg support plates between the blade bar and the upper blade; Figure 2 shows the block diagram of the support plates pressed against each other; Figure 3 shows the front view of the fastening system of the support plates on the blade holder; Figure 4 shows a section taken along the line A-A of Figure 3; Figure 5 shows the cross-section of the fastening system of the upper blade on the blade holder; Figure 6 shows the schematic diagram of the symmetrical mounting of four congruent support plates; Figure 7 shows the lateral contour of a beam shear comprising a pivoting blade; FIG. 8 represents the part indicated by A in FIG. 7;

  FIG. 9 represents the sectional view taken

line B-B in Figure 8.

  Support plates 3 and 4 are arranged between a groove 2 for a blade formed in a blade bar 1 and an upper blade 5. The surfaces 3a and 4b of the support plates 3 and 4 are flat, while that their surfaces 3b and 4a are straight conold surfaces reciprocally

  The guidelines V 1 and V 2 on the overtones

  conold faces 3b and 4a share the latter in one

  convex tie and concave portion Support plates 3

  and 4 are arranged vis-a-vis, by their surfaces con-

  3 b and 4 a, so that the director V 1 is in the up position and the director V 2 is in the low position The support plates 3 and 4 thus assembled are, as well as upper blade of prismatic shape 5 pressed with fixing screws 6 against the flat surface 2 a of the

  groove 2 At the location of the fixing screws 6, the

  3 and 4 are traversed by oval openings 7 and 8 which allow the displacement of the support plates 3 and 4 in the direction y, After assembly, the conold surface 4 a of the support plate 4 s adapts to the conoid surface 3 b of the

  support plate 3 becomes its negative form or strength.

  complementary me, and thus, the support plate 4 or the upper blade 5 is curved, that is to say that the conoid surface 4b and the flat surfaces 5a and 5b take

a cylindrical shape.

  The vertical section of the cylindrical surface 5b

  of the upper blade 5, thus deformed, provides the

  be sharp E, which is congruent with the director

  conold surfaces 3b and 4a and forms a portion of

  pse This part of the ellipse can be determined in a known manner according to the geometric dimensions of the bar

  blade holder 1 and the upper blade 5.

  Support plates 3 and 4 should also be

  xee in a particular way in the blade bar 1 to prevent them from falling when replacing the

  upper blade 5 - which is carried out in an appro-

  requested by means of a screw connection This problem is solved

  read with a stepped screw with an opening

  key wrench, and through-pitch oval holes

  and 11 formed in the support plates 3 and 4 of

  that the threaded portion 9a of the stepped screw 9 having an inner wrench opening is fixed in the blade bar 1 and the cylindrical portion 9b is in the stepped oval holes 10 and 11, so that the the diameter of the cylindrical portion 9b coincides with the transverse dimension of the oval holes 10 and 11, which has the effect that it produces no transverse offset, but that the support plates 3 and 4 can be moved one on the other in the direction y and that in addition the cylindrical portion 9 has rests against the upper face llb

oval hole crossing 11.

  In view of considerations relevant to the manufacture

  tion, the support plates 3 and 4 can be subdivided from the point of view of their length, just as in the case of division made in a known manner of the length of the blades.

  to form two or more elements.

  In the case of a couple of long bearing plates

  reduced by subdivision, the shape of the plates of appli-

  it is identical on the right and left sides and consequently there is no symmetrical part for the left and right sides when the subdivision is carried out in the vertical median plane with respect to the longitudinal direction of the pair of support plates and that any other subdivision is carried out symmetrically with respect to this median vertical plane and with respect to a plane parallel thereto, and that the one or more pairs of support plates are arranged by being rotated by 1800

  compared to the left pair (s) of the rating plates.

  pui. The principle of a solution tile is explained for example in Figure 6, in which the support plates 3 and 4 are subdivided respectively in two.

support plates 12,13 and 14,12.

  The displacement of the following support plates 3 and 4

  the direction y - of surfaces conoides 3b and 4a parallel-

  one on the other is ensured by an eccentric dou-

16.

  The double eccentric 16 is made in such a way that

  re it can only be rotated on an angle of 0 to 1800,

  which can be guaranteed by the proper choice of

  their eccentricity This appropriate value of eccentricity

  cited is always greater than the maximum reciprocal

  mum support plates 3 and 4 in the y direction, this displacement being effected perpendicular to the plane of the director 7 V 1 or V 2 According to the pair of support plates, 3.0 it is necessary to use two eccentric double 16, that is to say that in the case of the support plates 3 and 4 it is necessary to use two eccentricdouble 16, while in the case of the support plates 12, 13, 14 and 15, it is necessary to

  use four double eccentrics to carry out the de-

placement in the direction y.

  In the case of a rigid attachment of the blade sec-

  According to the invention, the precise adjustment of the slot between

  slides is performed as follows.

  When mounting in the basic position, the support plates 3 and 4 are inserted into the support bar.

  blade 1, that is to say that the support plates 3 and 4 super-

poses overlap.

  The constant slit setting, that is to say

  the slot S between the plates 5 and 17 is effected

  Next, we first adjust the gap between

  at the two endpoints of the upper blade.

  5 using the eccentric ball bearings 18 of the blade bar 1, then controlling in its middle the slot between the upper blade 5 and the lower blade

  17 and a correction is made in the case of a deviation.

  The edge curve E, theoretically fixed, of the upper blade 5, which is a piece of ellipse, deviates slightly from the cutting edge required in the

  practical, because of machining defects (posi-

  and shape of the surfaces of the grooves carrying the blades and located on the blade bar 1 and the table 19) and because of variations in dimension appearing by

  following the re-sharpening of the blade 5, and is more or less

  The curve 6 determined theoretically can be corrected.

  This is done with the cutting edge of the upper lamp 5 by moving the support plates 3 and 4 together in the y-direction. This offset is achieved with the aid of two double eccentrics. a same rotation of the two double eccentric 16, the support plates 3 and 4 move parallel to one another

  and thus the surface 4b of the support plate 4 varies from

  Only the upper blade 5, which simultaneously implies a modification of the tilt curve. The nature of the modification (the inclined surface of the upper blade 5 is bent more or less than in the initial state) depends on

  the reciprocal position of the V 1 and V 2

  these congruent conoids 3b and 4a Indeed when the

  director V 1 of the surface area 3b deviates from the

  rectice V 2 of the conolde surface 4a, we obtain, as a consequence of the modification, a cylindrical surface 4b which is more curved than at the origin, or a blade of this form, whereas in the opposite case obtains a cylindrical surface 4b which is less curved than originally, or a blade 5 of similar shape.

  extreme of the latter case, namely when the directors

  these V 1 and V 2 coincide leads to a flat surface 4 b.

  In this case the support plates 3 and 4 can be used to

  support the shear blade with a sharp edge

  tiligne. In the case of precision adjustment, the end points of the cutting edge of the upper blade 5 are not

do not move.

  In the case of a subdivision and arrangement of the support plates 3 and 4 as shown in FIG. 6, the four double eccentric members 16, which are necessary for the two support plates 12, must be mounted. ,

  13 and 14, respectively so that, in a

  in the same direction, the modification of the window

  between the blades on the whole curve of the cutting edge is made in the same direction. This is achieved thanks to

  that the double eccentrics 16 are arranged

  symmetrical section on the right side and on the left side.

  The solution according to the invention eliminates the

  additional constraints appearing in the upper blade

  in the case of other solutions, and the gap between

  the lower blade and the upper blade is always

  aunt over the entire cutting length The manufacture of these

  plate support is simple since one can also

  subdivided elements (for this purpose it is necessary to use a shorter device) and that, in this case, it suffices to manufacture only one type

of support plate.

Claims (2)

  1 Device for adjusting the shape of the edge of the upper blade of balancing shears having a pivoting blade, by elastic deformation, in the case of rigid attachment of the blade, characterized   in that two support plates (3,4) reciprocally   gruentes, the length of which is identical to that of the   me superior (5) and whose face has a surface   plane (3 a, 4 b) and whose autxeface has a co-   curved nold (3 b, 4 a), are mounted between the bar   the blade (1) and the upper blade (5) so that they are facing each other by their curved conoidal surfaces (3b, 4a), so that the guides (V 1; V 2 ) conoides are located on the antipodal faces, that furthermore the plates (3,4) thus assembled are pressed against the flat surface (2 a) of the groove (2) arranged   in the blade bar (1), thanks to which the surface su-   the upper part is cylindrical (4b) and the blade (5) is adapted to this cylindrical surface (4b) by virtue of the fact that the said blade (5) is fixed to the blade bar (1) -by the intermediate support plates (3,4) by means of a detachable connection, suitably by screw connections (6), and that a mechanism displacing the support plates (3, 4), constituted advantageously by two double eccentrics (16), serves to move the plates of   support (3,41 on top of each other in a certain direction   conque, preferably in the direction (y).   2 Device according to claim 1, characterized   in that the support plates (3,4) are subdivided transversely with respect to the longitudinal direction, advantageously every 1500 mm.