A tensioning and drive system with low stress intensity for band saws

Abstract

The present invention relates to an improved tensioning and drive system designed to increase the performance and operational efficiency of band saws. The said system comprises a special mechanism that generates the required tension on the band while providing drive for the saw by applying pressure to the pulleys. In the band tensioning and drive system, one or more surfaces with low friction force and low point pressure are provided; the said surfaces, according to different configurations, may consist of structure that comprises water channels or multiple wheels (8) that are covered with a flexible material positioned along the back plate (2). Water channels prevent wear on the saw body and increase its durability by creating aquaplaning on the surface through hydrodynamic and / or hydrostatic pressure, while wheels (8) surrounded by flexible material minimize point pressures and friction during movement, preventing wear on the mechanism and saw body. The system provides extended service life and superior cutting performance in band saws.

Description

[0001] A TENSIONING AND DRIVE SYSTEM WITH LOW STRESS INTENSITY FOR

[0002] BAND SAWS

[0003] Subject of the Invention

[0004] The present invention relates to a tensioning and drive system developed for use in band saw cutting machines .

[0005] Prior Art

[0006] Natural and artificial stones are used in many areas of industry due to their durability, attractive colors and patterns , and practicality . The stones must undergo processes such as sawing to make them suitable for applications . Many sawing machines exist in the prior art . There are factors that negatively affect the sawing performance of saws in sawing machines . Insufficient tension of the saw may cause oscillating movement . This leads to a decrease in sawing quality and precision, damage to the saws , increased energy consumption, longer sawing times and occupational safety risks . Excessive tension of the saw causes problems such as cracking , breaking and rapid wear of the saw .

[0007] Documents are available concerning improvements in tensioning and drive systems developed for use in sawing machines in the art .

[0008] An example of the prior art is patent document US2019210128A1 . The document discloses a guide block assembly designed to provide control and tensioning of the saw blade in large-size band saws . The invention disclosed in the said document aims to increase the stability of the saw blade by supporting the saw blade from only one side . The guide block assembly keeps the saw blade tensioned, reducing vibrations and overheating of the blade , thus increasing sawing speed and production efficiency . However , friction between the saw blade and the guide block can cause the blade to heat up . This can adversely affect the quality of the cut and shorten the life of the blade . In addition, performing the tensioning with a small- scale contact in the place where the guide block is located may cause problems such as fractures or cracking due to stress formation at the contact point of the saw .

[0009] Another example of the prior art is the patent document US2011000355A1 . The document discloses a multi-blade saw machine designed for cutting materials such as metal , wood or stone into thin slabs . To adj ust the tension of the blades , a hydraulic or oil-pressurized tensioning mechanism is provided, which ensures a stable and safe operation of the blades . This mechanism, located on the second band saw wheel , comprises a series of push rods used to adj ust the tension of the band saw . The tension control mechanism, which operates under hydraulic pressure , controls the movement of the rotating shaft and ensures that the saw is tight or loose . However, tensioning is done with push rods . Providing tensioning by applying point pressure can cause the saw to wear and crack .

[0010] Another example of the prior art is the patent document W02009040841A1 . The document relates to a multi-wire cutting machine for cutting natural stone or similar materials into thin slabs . This machine comprises a tensioning system that can adj ust the tension of each diamond wire independently . The tensioning system generally consists of pulley sets , hydraulic cylinders , guide and niches for lubrication of sliding elements . This system adj usts the tension of each diamond wire individually to ensure that the wire works efficiently during the cutting process . Thus , wire breakage due to excessive tension or cutting errors due to looseness are prevented . However, since pulleys of smaller diameter than the main drive pulleys are used, the maximum point pressure to which the saw is subj ected is still generated in these tension pulleys . In addition, it is considered impractical to use complex pulley sets in cutting tools . In addition, complex pulley sets can increase production and maintenance costs .

[0011] In order to overcome the disadvantages mentioned above , a tensioning and drive system has been developed for use in sawing machines , wherein tensioning and drive are provided over a large surface area and the friction force is reduced to negligible levels by means of water channels .

[0012] Detailed Description of the Invention

[0013] The invention relates to a tensioning and drive system for use in cutting machines , particularly for cutting natural and artificial stones , wherein the tensioning is provided over a large surface area and the friction force is reduced by means of water channels or multiple wheels .

[0014] The main obj ect of the invention is to improve the cutting performance of saws .

[0015] Another obj ect of the invention is to provide the dimensional precision required for cutting .

[0016] Another obj ect of the invention is the prevention of saw oscillation .

[0017] Another obj ect of the invention is to create the saw tension pressure required at the point of creating the friction force required for the drive , with minimum point stress . Another aim of the invention is to prevent stress accumulation at a certain point of the saw by maintaining the stress over a large surface area . Thus , it is aimed to extend the life of the saw and to prevent the failure events caused by point stress .

[0018] A further obj ect of the invention is to pave the way for the use of thinner saw bodies and thus thinner cuts , since a lower maximum point pressure can be applied to the saw .

[0019] A further obj ect of the invention is to reduce the stress level to which the saw is subj ected and to extend its economic life .

[0020] In general , the invention aims to provide the required frictional force between the pulley and the saw for the generation of the drive force required by the working principle of the machine , which performs processing by rotating the pulleys and the saw traveling on the pulleys without slipping, by using as little as possible of the maximum pulling power of the saw, and thus maximizing the benefit of the pulling power of the saw body for the sawing process .

[0021] The invention relates to a tensioning and drive system for band saw cutting machines , comprising;

[0022] - one or more low coefficient of friction pressure surfaces interacting with the saw ( 10 ) , positioned between the pulleys ( 9 ) in the gap, wherein the saw ( 10 ) does not come into contact with the pulley and / or positioned on the outer periphery of the pulley ( 9 ) in the part where the pulleys ( 9 ) come into contact with the saw ( 10 ) , - a back plate (2) , mounted on the surface of the pressure surface not in interaction with the saw (10) , with a geometry capable of preventing the pressure from being pointwise or narrow-sectioned and compatible with the pressure surface with sufficient flexibility and durability,

[0023] - the back plate (2) for tensioning and / or driving the saw (10) and at least one hydraulic cylinder (3) for providing propulsion by applying mechanical force to the pressure surface .

[0024] In one embodiment of the invention, the pressure surface comprises a pressure plate (1) having water channels. These channels carry hydrodynamically and / or hydrostatically pressurized water and allow the formation of a water film, thereby minimizing friction.

[0025] In one embodiment of the invention, a pivot bracket (5) is provided for movably securing the hydraulic cylinder (3) to the back plate (2) .

[0026] In one embodiment of the invention, a connecting rod (6) is provided for movably connecting the hydraulic cylinder (3) to the pivot bracket (5) .

[0027] In another embodiment of the invention, the low coefficient of friction surface comprises multiple wheels (8) surrounded by resilient material, arranged along the back plate (2) . These wheels (8) ensure that the saw body does not wear out during movement, and the flexible material of the wheels (8) and the multi-wheel (8) installation ensure that no point pressure is generated and that the saw has a longer service life . In one embodiment of the invention, there are water pipes ( 4 ) for transferring water to minimize the frictional force by forming a water film on the pressure surface .

[0028] In one embodiment of the invention, there are connection elements ( 7 ) connecting the water pipes ( 4 ) to the pressure surface .

[0029] In one embodiment of the invention, there is provided a water pump for transferring water to the water pipes ( 4 ) .

[0030] In one embodiment of the invention, the pressure surface comprises a material having a low coefficient of friction .

[0031] One embodiment of the invention comprises a water tank for supplying water necessary to form a water film between the saw and the pressure surface .

[0032] Single or multi-band sawing machines using the said tensioning and drive system are within the scope of protection of the invention .

[0033] This system provides the necessary drive power to the saw by applying pressure from the outer surface of the pulleys , while applying force to the saw between the two pulleys , allowing the saw to be stretched to the desired amount .

[0034] An advantage of the invention is that it provides the saw tension pressure required at the points of providing the dimensional precision necessary for sawing and creating the friction force required for the drive with minimum point stress , thus extending the saw life and preventing the occurrence of point stress-induced breakages . A further advantage of the invention is that a reduced maximum point pressure applied to the saw allows the use of thinner saw bodies, thereby enabling the saw to perform thinner cuts.

[0035] Descriptions of Figures

[0036] Fig. 1: Overview of a band saw configuration with tensioning and drive system

[0037] Fig. 2: Front diagonal view of the configuration of the pressure surface consisting of a pressure plate (1) with water channels, positioned between the pulleys (9) in the gap where the saw (10) does not come into contact with the pulley (9)

[0038] Fig. 3: Rear diagonal view of the configuration of the pressure surface consisting of a pressure plate (1) with water channels, positioned between the pulleys (9) in the gap where the saw (10) does not come into contact with the pulley (9)

[0039] Fig. 4: Close-up view of a cross-section of the configuration of the pressure surface consisting of a pressure plate (1) with water channels

[0040] Fig. 5: Front diagonal view of the configuration of the pressure surface consisting of wheels (8) positioned between the pulleys (9) in the gap wherein the saw (10) does not come into contact with the pulley (9)

[0041] Fig. 6: Rear diagonal view of the configuration of the pressure surface consisting of wheels (8) positioned between the pulleys (9) in the interval where the saw (10) does not come into contact with the pulley (9)

[0042] Fig. 7: Close-up view of a cross-section of the configuration of the pressure surface consisting of wheels (8) Fig. 8: Front diagonal view of the configuration of the pressure surface consisting of a pressure plate (1) with water channels positioned around the pulleys (9)

[0043] Fig. 9: Rear diagonal view of the configuration of the pressure surface consisting of a pressure plate (1) with water channels positioned around the pulleys (9)

[0044] Fig. 10: Front diagonal view of the configuration of the pressing surface consisting of wheels (8) positioned around pulleys (9)

[0045] Fig. 11: Rear diagonal view of the configuration of the pressing surface consisting of wheels (8) positioned around pulleys (9)

[0046] List of Reference Signs in Figures

[0047] 1. Pressure plate

[0048] 2. Back plate

[0049] 3. Hydraulic cylinder

[0050] 4. Water pipes

[0051] 5. Pivot bracket

[0052] 6. Connecting rod

[0053] 7. Connection elements

[0054] 8. Wheels

[0055] 9. Pulley

[0056] 10. Saw

Claims

AMENDED CLAIMS received by the International Bureau on 06 April 2026 (06.04.2026)1. A tensioning and drive system for use in band saw cutting machines characterized in that the system comprises one or more low-friction coefficient pressure surfaces interacting with the saw (10) , positioned between the pulleys (9) in the gap where the saw (10) does not contact the pulley and / or positioned on the outer circumference of the pulley (9) in the section where the pulleys (9) contact the saw (10) ;- a back plate (2) mounted on the surface of the pressure surface that is not in contact with the saw (10) , having a geometry capable of preventing the pressure from being concentrated at a point or in a narrow section, and possessing sufficient flexibility and durability to be compatible with the pressure surface,- at least one hydraulic cylinder (3) element that provides thrust force by applying mechanical force to the back plate (2) and the pressure surface for tensioning and / or driving the saw (10) .

2. A system according to claim 1, wherein the pressure surface consists of a pressure plate (1) with water channels.

3. A system according to claim 1, wherein the system includes a pivot bracket (5) for movably securing the hydraulic cylinder (3) to the back plate (2) .

4. A system according to claim 1, wherein the system includes a connecting rod (6) for movably securing the hydraulic cylinder (3) to the pivot bracket (5) .

5. A system according to claim 1, wherein the system consists of multiple wheels (8) extending along the back plate (2)to reduce friction on the surface of the pressure surface that interacts with the saw (10) .

6. A system according to claim 2 or claim 5, wherein the system comprises water pipes (4) that provide water transfer to minimize the friction force between the system and the saw (10) by forming a water film on the pressure surface.

7. A system according to claim 6, wherein the system includes connection elements (7) connecting the water pipes (4) to the pressure surface.

8. A system according to claim 6, wherein the system includes a water pump that supplies water to the water pipes (4) .

9. A system according to claim 1, wherein the pressure surface contains a material with a low friction coefficient.

10. A system according to claim 6, wherein the system comprises a water tank that provides the necessary water.

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