FR2534508A1 - VERTICAL RIBBON SAW - Google Patents

Abstract

THE INVENTION CONCERNS A VERTICAL BAND SAW INCLUDING A FRAME 1 AND A WHEEL SUPPORT 3 CARRYING TWO WHEELS 10, 11 DRIVING A TAPE 13. ACCORDING TO THE INVENTION, THE WHEELS ARE INCLINED WITH RESPECT TO THE CUTTING PLANE 4 BY AN ANGLE. LESS THAN 90, THE RIBBON 13 IS PIVOTED INTO THE CUTTING PLAN BY SLIDES 14, 15, AND THE WHEEL SUPPORT 3 CAN SLIDE ON THE FRAME 1 BY MEANS OF TWO GUIDES 5; 6, 7 ARRANGED ON EACH OTHER OF THE SECTIONAL PLAN. APPLICATION TO THE DESIGN OF BAND SAWS.

Description

The invention relates to a vertical band saw comprising a frame intended for

  to receive the workpiece on a work table of the frame by means of clamping means arranged on either side of the cutting plane, and a substantially vertically placed wheel carrier, carrying wheels arranged above and below the region of the workpiece, one of which is driven and on which the endless sawing belt rotates, and slides arranged above and below the workpiece region, connected to the wheel carrier and

  used to stabilize the steering, the wheel support can

  sliding with horizontal guidance on the frame, trans-

  towards the direction of advance of the material to be sawn, at the height of the material, in order to advance in the direction

  cutting section, the clamping means being formed, the side of the sup-

  wheel carrier, with a fixed application surface having a passage opening for the ribbon and the opposite side of the

  piece of jaws that can open and close.

  In known vertical band saws of this kind, the wheel carrier can slide in the direction

  on a central guide around which he can simultaneously

  rotate to make miter cuts.

  a relative instability of the wheel support guide which in-

  will not be able to produce great cutting yields with the resultant efforts. In addition, for cutting, the ribbon of 900 is rotated to bring it, from the plane of rotation located transversely to the plane of section, in the plane of the cutting direction Cela means on the one hand a suitably calculated spacing of

  wheels so that it exists, next to the cutting area, suf-

  distance to execute without difficulty the

  flipping the ribbon to 90 This results in a magnitude appreciated

  known vertical band saw, with the corresponding expense. On the one hand, because of the need for a large bandwidth, this means that the ribbon must be as narrow as possible in the working direction so that the trimming is possible in the desired manner. But this results in flexural rigidity. greatly diminished ribbon in the working direction and as a result, the risk of ribbon flexing under increasing cutting pressure

  alternating bending efforts as well as a lower

  cutting force because the feed force must be adjusted

  according to the section of the ribbon, kept small in consequence

  this. The object of the invention is to improve a vertical band saw of the species defined above so that with equal power it is of smaller construction, given the maximum section of the workpiece, the performance of cutting is increased by a guide and / or a more advantageous adjustment of the ribbon and at the same time, one obtains a guide and a maintenance wheel support that can cope with this increased cutting efficiency and which also allows to place obliquely the wheel support in the plane of cut Finally, in this order of ideas, it is necessary that

  keeping the workpiece by the clamping means is stable

  based on different load directions, or

independent rendering.

  Starting from a vertical band saw of the kind mentioned above, this problem is solved, according to the invention, by the fact that the wheels are mounted so as to be able to turn on the wheel support while being inclined, relatively at the cutting plane, at an angle less than 900, that the ribbon

  is pivoted in the cutting plane by the slides

  and that the wheel support can slide on the frame by means of two guides arranged, in their direction of action,

  on both sides of the cutting plane.

  With this arrangement of wheels, according to the invention, on the wheel support, it becomes possible to support the wheel support by means of two guides located in their direction of action next to the plane of the section, which leads to a noticeable stabilization of the wheel support and thus to a quieter operation of the ribbon In addition, it can in this way significantly increase the efficiency of -3 cut because now the wheel support can absorb without

  tipping reaction forces significantly larger.

  In addition, the deburring of the ribbon, less than 90 for the cut, allows a lower spacing of the wheels as well as a greater width of the ribbon in the cutting direction, so that the machine as a whole is of more construction. small and allows, thanks to the mentioned width of the ribbon, a greater cutting efficiency while reducing the risk that the ribbon does not yield backwards in the cutting region, under the cutting pressure, and is thus subject to an effort

  alternating flexion all the greater.

  It has been found advantageous that the angle is from 35 to 500,

preferably 40.

  In addition, the vertical band saw according to the invention is distinguished by the fact that during the attack of the workpiece, the ribbon is guided transversely to the direction of advance between the wall portions adjacent to the passage opening. of the application surface fixes and a part of wall, during the attack, is applied elastically against the tape

  As a result, the ribbon is precisely stabilized in particular

  the attack process so that the attack can be carried out with a significantly increased cutting efficiency relative to what is known, without risk

warping ribbon.

  It is advantageous that the wall portions have, on the side facing the workpiece, a recess for the teeth

  It is thus possible to draw the ribbon in

  only to the region of the wall

  born, therefore precisely outside the region of sec-

  the room, so that no more movements are needed

  special advance for the next cut and that consequently

  it also saves a certain amount of

  do the wheel support and its motion area.

  For the return stroke of the ribbon after the cut has been made, the wall portions may be designed to be able to move away from one another so that collisions do not occur at that point. However, it is also possible, for example, for the recess to taper conically towards the passage opening so that, during the return stroke, the tape can penetrate into the recess. A particular advantage of the invention may lie in the fact that the ribbon guide attached to the work table is guided, in the direction of advance of the ribbon, between surfaces of the work table.

  ribbon guide undergoes further transver-

  badly at the advance direction of the ribbon and this way,

  ribbon operation may be even quieter.

  In addition, it has been found advantageous that the wheel support is fixed, by its parts cooperating with the guides, so as to be able to pivot in the plane of section in the direction of the part Thus, the possibility of an oblique position of the wheel support and therefore tape for sawing profiles, in particular square tubes and beams,

  because here the maximum length of engagement of the ribbon is nota-

  smaller than when the ribbon is not inclined.

  In addition, here, because of the oblique position of the wheel support, there is no noticeable variation in the load relative to the horizontal band saws, for the oblique position given to the wheel support in view of a situation of In particular, it is not necessary, for such an oblique position, weight compensating members. In addition, it has been found advantageous that the fixed application surfaces of the clamping means as well as the corresponding respectively fixed parts of the jaws which can open and close are designed in the form of a frame surrounding the maximum section of the piece and possibly

  the table, the upper and lower branches of the frame

  In addition, the jaws can be guided, on the upper branch of the frame, vertically and transversely to the direction of movement and, on the lower branch of the frame, vertically, while the lower lateral guide between rods connecting the upper branches and bottom of the frame is provided by

  lateral projections of the jaw bodies.

  Thus, for the fastening of the workpiece, a particularly torsionally rigid construction is obtained which, in addition, contributes to the material in the form of a bar

  thrust forward from one cut to another can not move

  cer upwards between the jaws.

  Another advantage of the above structure results from the fact that the upper guide of the ribbon is guided between the upper branches of the frame in the direction of advance of the ribbon Thus, here also, as already mentioned above for the lower guide of the ribbon, one obtains for the ribbon guide an additional lateral support which contributes to

  to reduce the oscillations and thus to silence the func-

sawing.

  Finally, the ribbon guides can also be guided vertically relative to the worktable and the branches of the frame and be articulated to the wheel support of

  This measure is used quite generically

  It is also necessary to obtain the necessary mobility when, as provided in the machine according to the invention, the wheel support is secured to the relative movement of the ribbon guides relative to the frame or to the clamping means. designed to be able to rotate relatively

to the frame.

  Other peculiarities and details of the invention

  will appear below in the description of the object of

  the invention, referring to the drawings in which Figure 1 shows the vertical band saw in elevation from the front, along the section line I-I of Figure 3; Figure 2 is a corresponding side elevation along section line II-II of Figure 1;

  FIG. 3 is a plan view of the green band saw.

  tical of Figures 1 and 2; Figure 4, a partial sectional elevation along line IV-IV of Figure 2, with respect to the clamping vice; Figure 5 is a plan view of the vice of Figure 4; FIG. 6 is a partial horizontal section of the fixed application surface of the clamping means, in the region of the passage opening of the ribbon and

  FIGS. 7 and 8, two views of the control settings

  cutting section according to FIG. 2, in the case of a tube with

rectangular shape.

  According to FIGS. 1 to 3, the vertical band saw according to the invention has a frame 1 which comprises a work table 2 on which the part not shown is brought to

sawing.

  On the frame 1, a wheel support 3 is mounted of

  sliding way on both sides of the plane of

  4. This is ensured in the guide 5, the closest to the cutting plane, for example by a round guide, while on

  the guide furthest from the cutting plane is provided

  guide face 6 on which the wheel support 3 is supported

  by means of a support wheel 7 Above the guide

  of 5 is arranged a fluid cylinder 8 whose cylinder is fixed to the wheel support 3 while the piston rod 9 rests on the frame The cylinder is used to advance the support

  of wheels 3 towards the piece not shown.

  As can be seen in FIGS. 1 to 3, the wheels 11 are inclined, relative to the plane of section 4, by an angle of less than 900, in the present case of about 40

  relating to the advance direction 12 of the material to be

  This tilting of the wheels has the effect that the ribbon 13 works, between the guides 14 and 15, being deflected only by an angle less than 900 correspondingly, so that the alternating bending forces applied to the

ribbon are significantly reduced.

  Since the wheel support 3 is supported relative to the frame 1 departure and other of the cutting plane 4, a particularly simple guide is obtained which, as shown in particular in Figure 2, also allows to rotate the wheel support 3 in the plane of section, relative to the guide 5, by means of detachable connections 15 ', 16, of

  so that one can perform oblique attacks, in par-

  Particularly on box sections, as shown with reference to FIGS. 7 and 8 FIG. 7 shows the oblique attack of a box profile 17, so that the cutting length is reduced, relative to the length of attack. vertical example shown in Figure 8, for the same

room 17.

  Figures 2 and 3 show the vises 18 and 19 ser-

  to maintain the room and which, as we see

  2, are executed as structures

  in the frame formed of a fixed application wall 20, of jaws

  21 being able to open and close, of integral parts of the machine, 22, carrying these jaws and branches of

  frame 23, 24 connecting the parts 20 and 22.

  Figures 4 and 5 show elevation vices

  in section and in plan, FIG.

  the section line IV-IV of FIG. 2, the body of

  choirs 25 being guided both vertically and horizontally

  1 to the frame branch 23 by means of corresponding drill profiles while on the branch 24 of the frame, it is guided in the vertical direction at 26 while lateral guides 27 are directed towards vertical struts 28 which extend between the upper branch and the branch

  lower part of the frame and are fixed there.

  It is easy to understand that the actuation of

  jaws 21 can be mechanically and / or hydraulically

  cally. About Figures 1 and 2 and given the

  Figure 6, we will speak again of another object of the invention.

  FIG. 6 shows the fixed application walls 20 of the clamping devices 18, 19. Between these fixed application walls, the strip 13 is guided between corresponding plates.

  in hard metal 14, 15, but in such a way that the

  the removal of the ribbon 13 between the application walls 20 is obtained in the manner shown in FIG. 6, so that the ribbon 13 does not move back beyond the application walls 20

  but finds between them its position of withdrawal, a

  31 being provided between the application walls 20 for the

sawtooth region 30.

  So that the ribbon 13 can be removed without colliding

  between the application walls 20, these walls can be designed to be able to open and close slightly according to the arrows 32. For the support of the ribbon 13 during the attack of the part, it can be furthermore provided that one of the guide plates 14 or 15 is elastically applied

against the ribbon 13.

  Finally, FIG. 1 in particular shows how the ribbon guide 15 can be guided between the vices 18 and 19 or in a corresponding guide recess of the table 2 and what has been said for the upper guide of the ribbon 14 relatively. to the branches 23 of the frame is also valid The ribbon guides 13 are well secured laterally and damped against oscillations, so that the power transmittable by

the ribbon can also be increased.

  In the case where the wheel support 3 can be pivoted in the manner indicated in FIG. 2, it may be provided that the ribbon guides 14 and 15 are also articulated in such a way that

  pivoting to this wheel support so that, in the manner

  shown in Figure 1, they can slide horizontally between the vices 18, 19 or inside the frame, independently

  the oblique position of the wheel support 3.

Claims (15)

  1. Vertical band saw with a frame   born to receive the workpiece on a work table of the frame by means of clamping means arranged on either side of the cutting plane, and a substantially vertically placed wheel carrier, carrying wheels arranged above and below of the region of the workpiece, one of which is driven and on which the endless sawing tape rotates, and slideways arranged above and below the region of the workpiece, connected to the wheel support and serving to stabilize   direction, the wheel support can slide with guiding   horizontal clearance on the frame, transversely to the direction of advance of the material to be sawed, at the height of the material, in order to advance in the cutting direction, the means of   tightening being formed on the side of the wheel support,   fixed application face having a passage opening for the ribbon and the opposite side of the workpiece, jaws which can open and close, saw characterized in that the wheels (10,11) are mounted so as to be rotatable on the wheel support being inclined relative to the cutting plane (4), at an angle of less than 900, than the ribbon (13)   is pivoted in the cutting plane by the slides   (14,15) and that the wheel support (3) can slide on the frame (1) by means of two guides (516,7) arranged in   their direction of action, on both sides of the cutting plane.   Saw according to claim 1, characterized in that   the aforesaid angle is 35 to 500, preferably 40.   3. Saw according to claim 1, characterized in that during the attack of the workpiece, the ribbon (13) is guided transversely to the direction of advance between the wall portions (20) adjacent the passage opening from the surface   of fixed application, and that part of the wall, when   is applied elastically against the ribbon -   4. Saw according to claim 3, characterized in that the wall portions (20) have, on the turned side   to the workpiece, a recess (31) for the teeth of the ribbon (13).   5. Saw according to claims 3 and 4, characterized   in that the wall portions (20) can move apart from each other (32) for the return of the ribbon, after the end of the cup.   Saw according to claims 3 and 4, characterized   in that the recess (31) narrows conically passage opening.   Saw according to claim 1, characterized in that the ribbon guide (6) associated with the work table (2) is guided in the direction of advance of the ribbon (13) between surfaces of the worktable.   8. Saw according to claim 1, characterized in that the wheel carrier (3) is fixed, by its parts cooperating with the guides, so as to be pivotable in the cutting plane towards the workpiece (pivoting fasteners 15 ' , 16 Figure 2).   9. Saw according to claim 1, characterized in that the wheel support (3) and thus the ribbon advancement device, preferably designed as a hydraulic cylinder (8), acts directly next to the guide (5). wheel support which is closer to the cutting plane, between its guide portion and the building.   Saw according to claims 8 and 9, characterized   characterized in that the possibility of pivoting the wheel support (3) on the guide farthest from the cutting plane (4) is ensured by the fact that the guide is designed in the form of a wheel (7) which is mounted so that you can turn on the   wheel carrier and takes place on a track (6) of the frame (1).   11. Saw according to claim 1, characterized in that the fixed application surfaces (20) of the clamping means and the respective fixed parts of the jaws.   (21) are conceived in the form of a frame surrounding the   maximum amount of room and possibly the table.   Saw according to Claim 11, characterized in that the upper and lower limbs (23, 24) of the frame are arranged horizontally.   13. Saw according to claims 11 and 12, characterized   in that the jaws (21) are guided on the upper branch (23) of the frame vertically and transversely to the direction of movement, and on the lower branch (24) of the frame, vertically, while the lower guide (27) between the rods (28) connecting the upper and lower branches of the frame is effected by means of lateral projections jaw body (25).   Saw according to claims 11 to 13, characterized   in that the upper guide of the ribbon is guided between the upper branches (23) of the frame in the direction of advance of the ribbon (13)   Saw according to claims 7, 8 and 14   in that the ribbon guides (14, 15) are further guided vertically relative to the table and to the legs (23, 24) of the clamping means frame and are   pivotally articulated to the wheel carrier (3).