FR2613978A1 - APPARATUS FOR SAWING BLOCKS OF STONE - Google Patents

Abstract

APPARATUS FOR SAWING BLOCKS OF STONE, OF THE TYPE IN WHICH THE TOOL 15 IS A DIAMOND WIRE TOOL, INCLUDING MEANS 11, 11 CAPABLE OF ADVANCING THE BLOCK 12 TO BE CUT IN RELATION TO THE TOOL 15, THIS TOOL BEING MOUNTED ON AN ADJUSTABLE SUPPORT 5 DESIGNED TO VARY THE LENGTH OF THE TENSIONED WIRE.

Description

261397R

  The present invention relates to a fixed device with vertical cutting for sawing blocks of stone by means of

of a diamond wire tool.

  More specifically, in the apparatus according to the invention, the component parts are arranged to adapt the face to the dimensions of the block to be cut, while maintaining the diamond wire tool under a predetermined tension,

  depending on the hardness of the block itself.

  Machines are known for cutting stone blocks such as marble or the like, by fragmenting them into smaller blocks, or by cutting them into plates, in which the tool consists of a wire made of steel or other suitable material. , for example a tool to

diamond wire.

  These machines generally have a frame structure in the form of a gantry under which the block to be cut is placed, and on which are installed guide pulleys and other suitable means for driving the wire. In some cases, the entire power unit is lowered with the wire as it is pruned; in other cases, for example, according to the description of Italian patent no 20558 B / 86 by the same author, the engine block slides horizontally along the beam

of the frame of the gantry.

  All these known devices are necessary to solve at least two problems: that which consists in applying to the drive pulley - at least in operation - sufficient friction, so as to obtain a fairly high tension of the wire, and that of guiding the wire very carefully, at the initial stage, in order to make a precise cut. In addition, the structures and mechanisms used must not be too complex, so as not to weigh excessively on the

production costs.

  The present invention provides an apparatus capable of further simplifying both the structure and the mechanisms connected thereto while eliminating

  completely the problems mentioned above.

  This object is achieved thanks to a machine in which it is not the tool, but the blocks to be cut which are moved and advanced towards the wire, which does not require the adjustment of the length of the wire as and when measure of

cutting advance.

  The machine according to the invention provides idler pulleys fixed to a movable arm whose vertical stroke is equal to or greater than the possible variation of the dimensions of the blocks to be sawn, so as to adapt the opening of the tool to wire diamond to the dimensions of the block in order to guide the tool more precisely in the

initial cutting operations.

  This and other advantages of

  the invention will emerge from the detailed description

  following, referring to the accompanying drawings in

which: -

  Figure 1 shows a front view of an apparatus according to the invention; Figure 2 shows a side view of the apparatus of Figure 1; Figure 3 shows a plan view of the same device. On a base 1 is fixed a structure, designated as a whole by the reference numeral 2 comprising a column 3 inside which a telescopic pole 4 having for example a square section, on which slides an arm 5 supporting a group pulleys

crazy upper.

  The displacement of the post is actuated by known mechanisms, such as worms or means

  hydraulic, which have not been shown in the drawing.

  On the arm 5 are installed idler pulleys 6, 7 and 8, the latter being equipped with a control device 9 of known type, designed to exactly align said idler pulley with the corresponding idler pulley 8 '(see FIG. 1) of the set of 6 ', 7' and 8 'lower idler pulleys

  mounted on an arm 5 'similar to the previous one.

  This second group is mounted below the level of the fixed rails 10, on which two carriages 11, 11 ′ are driven in parallel, the first carrying the block 12 to be cut, and the second the corresponding cut parts 13. On the post 3 a crazy pulley 14 is mounted which sends the diamond wire tool 15 to the crazy pulley 6,

  after receiving it from a steering wheel 16 which is mounted on the rear

  bre of the engine and which receives the tool from the idle pulley

lower 6 '.

  When the upper arm 5 moves, the steering wheel 16 also moves by an amount equal to half the

previous move.

  This movement can be controlled by known means, not shown in the drawings, in order to adjust the tension of the diamond wire tool and prevent it from

  get on and off the steering wheel 16.

  Operation is as follows: When the block 12 to be cut has been placed on a carriage 11 ′, it is advanced, with the carriage 11, towards the

8-8 'side.

  The height of the upper arm 5 is adjusted until a small distance is obtained between the upper surface of the block 12 and the lower part of the idler pulley 8. In this way, it is possible at the outset to

more precise cutting.

  The thread tension is then adjusted, either by hand or by automatic controls, using already known devices, in order to prevent the diamond thread tool from making undesirable shifts; devices 9 and 9 'are intended to check that the cut made is indeed perpendicular to the sliding plane

on rails.

  At this stage, the paired carriages 11, 11 ′ can be advanced by means of known devices, at a speed inversely proportional to the hardness of the stone to be

prune.

  As can be seen, the apparatus according to the invention is considerably simplified compared to similar machines already known. This reduces both production and operating costs, employs a shorter diamond wire tool or, for an equal length, makes longer cuts, after optimizing the cutting operations.

the diamond wire tool.

  In addition, the surfaces resulting from the cutting will be less rough and of better quality, the width of the diamond wire tool having been reduced, effectively eliminating the risks of oscillation or deviation which could occur during cutting. Of course the dimensions, as well as the materials used, can vary, depending on the different conditions of use.

26 1 3977

Claims (5)

  1 - Apparatus for sawing blocks of stone,   type in which the tool (15) is a wire tool   mant, characterized in that it provides means (11,11 ') suitable for moving the block (12) to be cut relative to the tool (15), said tool (15) being mounted on an adjustable support ( 5) intended to vary the length of the stretched wire.   2 - Apparatus for sawing stone blocks according to claim 1, characterized in that it comprises a telescopic pole (3) supporting two arms (5.5 ') (whose upper arm is movable) and a set idler pulleys and guide pulleys   (6,7,8,6 ', 7', 8 ', 14,16) for the diamond wire tool.   3 - Apparatus according to one of claims   above, characterized in that it comprises suitable means for modifying the position of the pulley   drive (16) to control the tension of the   til (15) with diamond wire, depending on the height at   which the idler pulleys (7,8) are placed.   4 - Apparatus according to one of claims   above, characterized in that it has a vertical face (8, 8 ') whose height is adjustable, means (9.9') being provided for adjusting the tool (15) with diamond wire perpendicular to the plane block sliding to be cut (12).   - Apparatus for sawing stone blocks comprising: means capable of driving two coupled carriages (11,11 ') (the first (11) transporting the block (12) to be cut and the other (11') the parts ( 13) cut) along a horizontal plane; a telescopic structure (3) for supporting the idler pulleys (7,8) of a diamond wire tool (15); a drive pulley (16) equipped with   appropriate means to modify its position in order to a- just tension the thread (15).   6 - Apparatus for sawing blocks of stone according to claim 5, characterized in that it comprises means (9,9 ') capable of adjusting the position of at least one pair of idler pulleys (8,8' ) in order to ensure an orthogonal cut by the wire tool diamond (15).