JPH0417774B2 - - Google Patents

Description

Claim 1: A circularly moving rope saw 1 supported against the cutting pressure by support rollers on both sides of at least one saw section 1a, and a feed drive 23, depending on the respective feed direction. a stone cutting saw with a casing 3 for a support roller bearing adjustable in rotation about the rope saw axis, the support roller 2 being arranged in the casing 3 with the axis of the support roller 2 and It is supported adjustable in a direction perpendicular to the rope saw axis and can be displaced towards the rope saw axis by means of an adjusting drive 16 as a function of the radial wear of the supporting roller 2. A distance sensor 20 is provided to detect this position of the rope, and the distance sensor 20 detects wear of the support roller 2 in the radial direction, and detects the displacement of the support roller 2. The adjustment drive 16 for adjustment comprises:
A stone cutting saw, characterized in that it is adapted to be controlled by a control device 21 connected to the sensor 20.

2. The casing 3 has a spring-loaded crimping roller 6 for the rope saw 1 on the opposite side of the rope saw axis from the support roller 2, the crimping roller 6 2. The stone cutting saw according to claim 1, wherein the stone cutting saw is arranged offset in the axial direction of the rope, away from the saw section 1a, with respect to the support roller 2 on the side of the saw section.

3 At least one casing 3 has a sensor 24 arranged upstream on the sawing side of the support roller 2 for constantly detecting the respective rope displacement, and the feed drive 23 is connected to the sensor 24. 3. Stone cutting saw according to claim 1, which is continuously adjustable depending on the cutting shape via a connected adjusting device 25.

4. Any one of claims 1 to 3, wherein the distance sensor 20 is arranged corresponding to at least one support roller 2 on the opposite side of the support roller 2 across the rope saw. The stone cutting saw mentioned in the section.

5. A stone cutting saw according to any one of claims 1 to 4, wherein the support roller 2 is supported by an adjustable eccentric shaft 12.

6. Stone cutting saw according to claim 5, wherein the adjusting drive 16 acts on a lever arm 17 connected to the eccentric shaft 12.

7. The adjustable eccentric shafts 12 of the two supporting rollers 2 of the casing 3 are each drivingly connected by a crank arm 14 and a connecting rod 15 between these crank arms 14. The stone cutting saw described in Section 5 or Section 6.

8 The connecting rod 12 connects the two crank arms 1
8. The stone cutting saw according to claim 7, wherein the stone cutting saw is configured to be adjustable in the longitudinal direction between 4 and 4.

9. Stone cutting saw according to claim 2, in which a spring-elastic pressure roller 6 is arranged in each case between two support rollers 2.

10 The pressure rollers 6 are each supported by a pivot lever, which has an axis of rotation 8 parallel to the pressure roller 6 and is supported against the casing 3 by a spring 9. The stone cutting saw according to claim 2 or 9, wherein

11. The stone cutting saw according to claim 10, wherein the spring 9 is configured as a rubber spring.

12. The stone cutting saw according to claim 10, wherein the support part incorporates a vibration damping device in addition to the spring 9.

Description The present invention provides at least one saw section supported against cutting pressure by support rollers on both sides.
Relates to a stone cutting saw with a circularly moving rope, a feed drive and a casing for a support roller bearing, which can be pivoted around the rope saw axis depending on the respective feed direction. .

In the known stone cutting saw of this type (Austrian Patent No. 371,761), by pivoting the support roller around the rope saw axis, depending on the respective feed device,
The resulting cutting pressure adjusts the force acting on the support roller at right angles to the axis of rotation of the support roller, so that the side walls of the rope saw guide groove of the support roller are protected against high loads. This results in reduced wear on the rope saw guide groove and, in this connection, a more accurate rope saw guide.
Guaranteed even after long-term use.

Although such a rope saw guide constitutes a necessary prerequisite for obtaining a precise sawing profile, this measure is insufficient for this purpose.
That is, the rotational axis of the casing for the support roller bearing must be
It must overlap the rope saw axis.
It is inevitable that the bandsaw guide groove will wear out, which will cause this axis of the rope to shift relative to the structurally defined axis of rotation of the casing, so that, for example, curves with a small radius of curvature It is no longer possible to cut accurately enough.

The object of the invention is therefore to eliminate this drawback of the known stone cutters of the type mentioned at the outset, in such a way that accurate cutting of curved shapes is guaranteed even when the supporting rollers are worn. It is.

According to the invention, this object is achieved in that the supporting roller is supported in the housing so as to be adjustable in a direction perpendicular to its axis and to the rope saw axis, and that the supporting roller is The rope is configured to be displaced towards the saw axis in response to radial wear, and a distance sensor is provided for detecting this position of the rope, by which distance sensor the radial displacement of the support roller is determined. The wear is detected and the adjustment drive is controlled by a control device connected to the sensor to adjust the displacement of the support roller. Ta.

Via the adjusting drive provided for this purpose,
By post-adjusting the supporting rollers to the extent of the respective wear of the rope saw guide grooves, deviations between the rope saw axis and the casing axis can be easily compensated for, and when the casing is swiveling adjusted, the rope is adjusted accordingly. You can maintain your current position. All the conditions for accurate cutting guidance are thereby met.

A prerequisite for this, of course, is that the rope saw does not lift off the support roller. For this purpose, the housing has a spring-loaded pressure roller for the rope saw on the side facing the supporting roller relative to the rope saw axis. These pressure rollers are arranged at a distance from the saw section and offset in the direction of this axis of the rope with respect to the support roller on the side of the saw section. The spring-elastic crimping roller causes the rope saw to rest closely against the supporting roller, independently of this diameter change of the rope and independently of the wear that occurs on the supporting roller and the crimping roller. Therefore, this vibration of the rope caused outside the saw section does not enter the saw section range. Moreover, the pressure roller
With respect to the support roller on the saw section side, it is arranged at a distance from the saw section and offset in the direction of this axis of the rope, so that the support roller on the saw section side, rather than the spring-loaded crimping roller, Define the saw shape in the saw classification range. When supporting the crimping roller in a spring-elastic manner, it is only necessary to take into account that the characteristic frequency of the vibration system imparted by the spring-loaded crimping roller is not in this signal frequency range of the rope. However, the spring-elastic crimping roller not only offers the possibility of guiding the rope saw in a vibration-free manner, but also ensures that the rope saw, pressed against the support roller with a given force, does not slip on the support roller. Since it also has an entraining effect, wear in the area of the rope saw guide groove is limited to a minimum.

Moreover, by post-adjusting the supporting rollers, the geometrical rope saw shape is fixed without being affected by this wear of the rope saw guide groove and the rope, so that the saw section can be fixed. This displacement of the rope in the range can be used for controlling the feed drive. This is known for straight cuts (US patent
4067312 specification). This wear-limited displacement of the rope will not affect the cutting guide when performing straight cutting operations, but this displacement is found to be very unpleasant when cutting curved shapes, so this For such feed control devices, there is a need for rope saw guides that are independent of wear phenomena. Also, it is not sufficient to provide one monitoring device for this maximum permissible displacement of the rope, as in the prior art. This is because, when cutting off one corner, for example, only this deviation of the rope is required, which is small compared to obtaining a straight cut shape, in order to ensure a homogeneous cut shape over the entire cut shape. This is because it cannot be tolerated. Taking this into consideration, at least one of the housings is equipped with a sensor arranged in front on the saw section side of the supporting roller, in order to constantly detect this deviation of the respective rope; In this case, the feed drive can be adjusted continuously depending on the cutting shape via an adjustment device connected to the sensor. Thereby, the feed drive can not only constantly maintain a predetermined rope sawing displacement in a given section of the cutting profile, but can also be adjusted to account for different rope sawing displacements. (This is required, for example, at a transition between two different curved sections).
This change is given in advance under program control by a computer.

Post-adjusting the support roller by this degree of wear of the rope saw guide groove and the rope is, according to a feature of the invention, provided with a casing on at least one support roller on the opposite side of the support roller across the rope saw. Control is achieved in a simple manner by the corresponding arrangement of fixed distance sensors. This distance sensor acts on the control device of the adjusting drive for shifting the support roller. Once this deviation of the rope is indicated by the distance sensor, the adjustment drive is controlled to compensate for said deviation and maintain the desired geometric saw shape guide.

In order to adjust the support roller in a direction perpendicular to its axis and to the rope saw axis, very different constructions are conceivable per se. A particularly advantageous relationship is obtained if the support roller is supported on an adjustable eccentric shaft. This is because in this case no sliding guide for the support bearing is required. In order to subsequently adjust the support roller, it is therefore only necessary to rotate the eccentric shaft. This is simply carried out by means of a lever arm connected to the eccentric shaft and on which the adjusting drive acts.

If two saw sections are arranged one after the other, it is necessary to support the rope saw between the two saw sections in each case by means of a support roller on the side of one saw section. In this case, the support rollers are adjusted together if they are subjected to uniform wear between the two saw sections. For this purpose, the adjustable eccentric shafts of this support roller are in each case drivingly connected between the crank arms by one crank arm and a connecting rod. The adjusting drive therefore has two
It is only necessary to act on one of the two eccentric axes.
If the wear of the two support rollers is significantly different, each support roller is provided with a distance sensor for the rope saw and a control device connected to this distance sensor. However, in general, in order to take into account the different wear on the two supporting rollers,
1 longitudinally adjustable between the two crank arms
It is sufficient to provide one connecting rod.

If a common casing is provided with supporting rollers for two saw sections arranged one after the other, a common spring-loaded spring cooperating with the two supporting rollers is provided between these two supporting rollers. A biased pressure roller is provided. Such an arrangement provides a very simple construction and ensures particularly effective suppression of rope saw vibrations. Therefore, each 2
The pressure roller arranged between the two support rollers is
It is also advantageous to provide it in only one saw section or in the outer saw section.

In order to be able to utilize the advantages of rotary bearings even in the case of flexible bearings of spring-loaded crimping rollers, the crimping rollers each have an axis of rotation parallel to these crimping rollers, and It is journaled in a pivot lever which is supported against the casing by a spring. Moreover, providing the pressure roller on the pivoting lever has the advantage that a better transmission ratio of the spring force and spring stroke can be obtained over the length of the lever, compared to displacing the pressure roller.

Embodiments of the invention are shown in the drawings.

1 is a schematic longitudinal sectional view of a rope saw support for stone cutting according to the invention; FIG. 2 is a partial sectional view taken along the line - in FIG. 1; FIG. A partial cross-sectional view of the rope saw support shown in FIG. 1 taken at two points in a direction perpendicular to the rope saw. FIG. 4 shows the support roller of the rope saw support shown in FIG. 1 is a schematic block diagram of the control device of the feed device and the adjusting drive for post-adjusting the casing, the arrangement of the casing indicated by dash-dotted lines being the same as in FIG. Only one support roller is shown in place.

A rope saw 1 of a stone cutting saw (shown schematically) is supported against the cutting pressure by support rollers 2 on both sides of the saw section. For this,
The support roller 2 is supported by a casing 3. According to the embodiment shown, this casing 3 is held rotatably about the axis of the rope saw 1 via three running rollers 4 and is rotated depending on the respective feed direction. , the cutting pressure applied to the rope saw 1 is exerted by the support roller 2 in a direction perpendicular to the axis of rotation of this support roller 2 . Therefore, almost no axial force is applied to the bearing portion of the support roller 2. Moreover, no corresponding transverse forces are applied, so that the rope saw guide groove 5 of the supporting roller 2 is advantageously loaded approximately radially. This has a favorable effect on the service life.

In addition to the two support rollers 2, a pressure roller 6 for the rope saw 1 is provided in the casing 3, which pressure roller 6 is connected to the two support rollers 2.
between the support roller 2 in relation to the rope saw axis
is placed on the opposite side. A pivot lever 7 is provided to support the pressure roller 6.
This pivot lever 7 rotates the casing 3 around a rotation axis 8 parallel to the rotation axis of the support roller 2.
It is supported by a spring 9. This spring 9 is constructed as a rubber spring in the exemplary embodiment and can be biased by an adjusting screw 10. The possible swivel angles of the swivel lever 7 are limited by a stop 11 formed by a screw to enable stop adjustment. As a result, the pressure roller 6 is pressed against the rope saw 1 via the spring 9, and this rope saw 1 is pressed against the support roller 2, so that the rope saw 1 is pushed into the rope guide groove 5 of the support roller 2. be forced to. With this, saw classification 1a
A reliable rope saw guide is ensured which effectively suppresses the vibrations that may be applied. The rubber spring provided in the illustrated embodiment has a self-vibration damping effect and thus acts against this occurrence of vibrations in the rope. If the damping provided by the rubber spring 9 is not sufficient or another spring should be used,
A vibration damping device, possibly combined with the spring 9 in one structural unit, can be integrated into the support.

If the support roller 2 is fixedly supported on the casing, the rope guide groove 5 of the support roller 2
And as the rope saw wears out, this axis of the rope shifts. This results in obstruction of the cutting guide. In order to avoid such drawbacks, even if the support roller 2 is worn out, the axis of the rope saw 1 can be maintained in the casing 3.
In order to always coincide with the axis of rotation of the rope saw, the axis of the support roller 2 is arranged adjustable in a direction perpendicular to the axis of the rope saw. In other words,
According to the illustrated embodiment, the support roller 2 has an eccentric shaft 12
The eccentric shaft 12 is rotatably supported by a support 13 of the casing 3. In order to adjust the two eccentric shafts 12 together, each eccentric shaft 12 is provided with a crank arm 14, which crank arms 14 are connected to one another via a connecting rod 15. A lever arm 17 is connected to the eccentric shaft 12 of one of the supporting rollers 2 and is adapted to be driven by an adjusting drive 16 which is pivotally mounted on the housing 3 .
When the lever arm 17 is driven by the adjusting drive 16, the eccentric shaft 12 is rotated. This rotational movement moves the crank arm 14 and the connecting rod 1
5 to the other eccentric shaft 12. The support rollers 2 are eccentrically supported by the support body 3 via the eccentric shafts 12, so when the two eccentric shafts 12 are rotated, each support roller 2 moves up and down, thereby causing the rope to move. It is designed so that it can be adjusted in a direction perpendicular to this axis. 2
Connecting rod 15 connecting two crank arms 14
is designed to be adjustable in the longitudinal direction via a threaded spindle 18. This screw spindle 18
A pivotably connected spindle nut 19 of one of the crank arms 14 is adjusted by. By varying the length of the connecting rod 15, the crank arm 14 can be rotated relative to each other and thus the control of the support roller 2 can be varied, whereby asymmetrical wear relationships can easily be taken into account. can do.

In order to detect the wear of the support rollers 2, a spacing sensor 20 fixed to the casing for the rope saw 1 is provided on at least one support roller 2 opposite the support roller 2 in relation to the rope saw axis. This distance sensor 20 is connected to a control device 21 for the adjusting drive 16 . If wear of the rope guide groove 5 or the rope saw 1 is detected as the distance between the distance sensor 20 and the supporting roller 2 increases, the adjusting drive 16 via the control device 21 causes the rope to The support roller 2 is loaded to be adjusted again until the saw again assumes a predetermined position coaxial with the axis of rotation of the casing 3 (see block circuit diagram in FIG. 4). Fourth
In the block circuit diagram shown in the figure, the support roller 2 is held adjustable by a slide guide 22.

For example, even if the cutting conditions change based on positional differences in the material properties of the cut object based on the cutting guide, it is possible to maintain a predetermined quality of cut at the maximum possible cutting capacity in each case. In order to
It is controlled depending on the respective displacement of the rope saw 1 in the a range. For this purpose, a sensor 24 for constantly detecting the respective displacement of the rope saw 1 in the guide plane perpendicular to the axis of the support roller 2 is located in front on the saw section side of the support roller 2. It is located. This sensor 24, like the distance sensor 20, consists of an inductive or capacitive distance measuring device that operates without contact. Based on the alignment of the support roller 2 obtained by rotating the casing according to the respective feed direction, the rope saw 1 moves in the plane defined by the rope guide groove 5 of the support roller 2. This deflection of the rope can be detected precisely by measuring the spacing of the rope saws 1 by means of the sensor 24, since it is only deflected according to the cutting pressure. This wear-induced displacement of the rope is compensated for by post-adjusting the support roller 2. Thereby, the feed drive 23 is controlled via the regulating device 25 connected to the sensor 24 as a function of the respective rope sawing displacement, so that the cutting pressure is independent of changes in the cutting conditions. It is then kept constant via the feed control or adapted to the respective cutting shape.

The adjustment device 25 and the control device 21 are realized by a computer 26 as shown in FIG. It goes without saying that different cutting pressures can be applied via the computer 26 for a given curved shape, thus ensuring a homogeneous cut.

Since the feed is obtained by a relative movement of the cutting object in a direction perpendicular to the rope saw, all drives are conceivable for the feed drive 23 that ensure this relative movement. Thus, for example, two motors can be provided for the feed drive, one for the drive of the workpiece slit and one for the frame supporting the casing 3 on the other hand, or if the workpiece is If it is fixed, it is sufficient to provide a motor for the gate drive and a motor for the frame of the casing 3, which is movable within the gate.