JP2015157344A - Work cutting method, band saw blade, and band saw machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work cutting method, a band saw blade, and a band saw machine, suppressing curved cutting by contacting of inner peripheral surfaces of an outward route side portion and a return route side portion at a band saw blade.SOLUTION: In a work cutting method, a work W is cut with an endless band saw blade 25 stretched between a drive wheel 17 and a driven wheel 23. The inner peripheral surfaces of the band saw blade 25 contact at portions moving opposite directions each other, between the drive wheel 17 and the driven wheel 23, otherwise, the inner peripheral surfaces contact to a spacer 53 arranged between the inner peripheral surfaces so that cut surfaces facing each other are individually cut in a cut groove of the work W by the portions of the band saw blade 25 moving in opposite directions from each other. The band saw blade is equipped with a straight tooth 33S which does not protrudes to an outer peripheral surface side and an inner peripheral surface side, when viewed along travel direction of the band saw blade 25, and an outer peripheral side protruding tooth 33B protruding to the outer peripheral surface side.

Description

  The present invention relates to a workpiece cutting method in which a workpiece is cut by an endless band saw blade wound around a drive wheel and a driven wheel, a band saw blade used in the cutting method, and a band saw machine provided with the band saw blade. More specifically, the present invention relates to a workpiece cutting method, a band saw blade, and a band saw machine that can suppress workpiece bending.

  For example, there is a band saw machine as a cutting machine for cutting a workpiece such as a metal material. There are two types of band saws: vertical band saws and horizontal band saws. The band saws drive the endless band saw blades that are wound around the drive wheel and the driven wheel, and are driven relative to the workpiece. The workpiece is cut by cutting it into Conventionally, a band saw blade generally has a configuration including left and right set teeth that are set out in the left and right direction when viewed in the traveling direction of the band saw blade, and straight teeth that are not set out in the left and right direction. . For example, if one of the set teeth on the left and right set teeth is heavily worn, it will bend toward the opposite side of the set teeth. Thus, when a work is cut using a band saw blade that tends to bend in one direction, it is difficult to suppress the bend.

  By the way, there is Patent Document 1 as a prior example that seems to be related to the present invention.

JP 62-208821 A

  In the configuration described in Patent Document 1, when cutting a workpiece with an endless band saw blade wound around a drive wheel and a driven wheel in a band saw machine, the workpiece is cut in the forward path portion of the circulating band saw blade. . The return path portion of the band saw blade is configured to move behind the forward path portion when viewed in the cutting direction with respect to the workpiece in the cutting groove of the workpiece cut in the forward path portion.

  That is, in the configuration described in Patent Document 1, although the forward path portion and the backward path portion of the endless band saw blade pass through a common cutting groove, the above-described bending is caused when the workpiece tends to be bent. The function to be suppressed cannot be achieved.

  The present invention has been made in view of the above-described problems, and is a workpiece cutting method for cutting a workpiece with an endless band saw blade wound around a drive wheel and a driven wheel, the drive wheel and the driven wheel. The band saw blades in contact with each other on the inner peripheral surface of the band saw blade, or the spacers disposed between the inner peripheral surfaces in contact with the inner peripheral surface. The cutting surfaces that face each other in the cutting groove of the workpiece are individually cut by the portions that move in the opposite directions.

  A workpiece cutting method for cutting a workpiece with an endless band saw blade wound around a drive wheel and a driven wheel, wherein the inward protruding portion protrudes toward an inner peripheral surface over about a half circumference of the band saw blade. A plurality of saw teeth having an interval are provided at appropriate intervals, and the inner peripheral surface of a portion of the band saw blade that moves in the opposite direction is contacted between the driving wheel and the driven wheel, or is disposed between the inner peripheral surfaces. When the workpiece is cut by contacting the inner circumferential surface with the spacer, when the saw blades are cutting the workpiece, cutting is performed obliquely downward, and the saw blades are detached from the workpiece. By switching the inclination direction of the band saw blade, the workpiece is again cut obliquely downward.

  An endless band saw blade, which is a straight tooth that does not protrude toward the outer peripheral surface side and the inner peripheral surface side when viewed in the traveling direction of the band saw blade, and an outer peripheral protrusion protruding toward the outer peripheral surface side. It is characterized by having teeth.

  Further, in the band saw blade, the outer peripheral protruding tooth is a set tooth that has been set out or a half-shaped bee-shaped saw tooth.

  Further, the endless band saw blade is provided with a plurality of saw teeth having an inward projecting portion projecting toward the inner peripheral surface over an approximately half circumference of the band saw blade at an appropriate interval, and the inward projecting portion is a band saw. The protruding amount is more than the thickness of the body member of the blade.

  Further, a band saw machine provided with an endless band saw blade wound around a drive wheel and a driven wheel, wherein the outer periphery of the band saw blade is between a vise device capable of fixing a workpiece and the drive wheel and the driven wheel. A saw blade approaching roller for sandwiching the surface side and bringing the inner peripheral surface of the band saw blade closer, and saw blade guide means for sandwiching and guiding the band saw blade between the vise device and the saw blade approaching roller , Are provided.

  Further, the band saw machine is characterized in that a spacer is provided between the inner peripheral surfaces of the band saw blade brought close by the saw blade moving roller.

  According to the present invention, the portion of the band saw blade that moves in the opposite direction between the drive wheel and the driven wheel, that is, the state in which the inner peripheral surfaces of the forward path side portion and the return path side portion of the endless band saw blade are in contact with each other, or The workpiece is cut in a state where a spacer is interposed between the inner peripheral surfaces. Therefore, the cutting groove of the workpiece is simultaneously cut by the forward path side portion and the return path side portion. At this time, the lateral component forces acting on the forward path side portion and the backward path side portion cancel each other, and the band saw blade circulates so that each saw tooth in the band saw blade is at the time of the forward path and the return path of the band saw blade. In other words, the cutting grooves act alternately on the opposing cut surfaces. Therefore, the workpiece is not bent in only one direction, and the bending can be suppressed as a whole.

It is front explanatory drawing which showed notionally and schematically the structure of the band saw machine which concerns on embodiment of this invention. It is a plane explanatory drawing which showed notionally and roughly the positional relationship of a drive wheel, a driven wheel, a vise device, a saw blade approaching means, a saw blade guide means, a support and a spacer. It is plane explanatory drawing which shows the structure of the endless-shaped band saw blade which concerns on embodiment of this invention. It is sectional explanatory drawing which showed notionally and schematically the structure of the saw blade approaching means. It is sectional explanatory drawing which showed notionally the structure of the guide means. It is sectional explanatory drawing which showed notionally and schematically the structure provided with the spacer between the outward path | route side part and return path | route side part in a band saw blade. It is explanatory drawing which shows another embodiment of a band saw blade. It is explanatory drawing which shows another embodiment of a band saw blade. It is explanatory drawing of the cutting method of the workpiece | work by the said band saw blade.

  Hereinafter, a band saw machine according to an embodiment of the present invention will be described with reference to the drawings. The present invention can be applied to a vertical band saw machine and a horizontal band saw machine. Therefore, the case where it implements to a horizontal type band saw machine shall be illustrated.

  As conceptually and schematically shown in FIG. 1, a band saw 1 according to an embodiment of the present invention includes a base frame 3, and a vise that can fix a workpiece W made of a metal material to the base frame 3. A device 5 is provided. The vise device 5 includes a fixed vise jaw 7A and a movable vise jaw 7B that is movable in a direction approaching and separating from the fixed vise jaw 7A. The configuration of the vice apparatus 5 as described above may be a well-known vice apparatus. Therefore, a detailed description of the configuration of the vice apparatus 5 is omitted.

  The frame main body 9 provided on the base frame 3 is provided with a vertically moving frame (moving frame) 11 which is moved up and down by a vertical movement actuator 10 such as a fluid pressure cylinder provided in the frame main body 9. ing. That is, both sides in the left-right direction (X-axis direction) of the elevating frame 11 are movable up and down (to the workpiece W) by the guide members 13 provided in the frame main body 9 in the vertical direction (direction approaching and moving away from the workpiece W). On the other hand, it is guided and supported so as to be movable in the direction of approaching and separating. A support bracket 15 is provided on one side of the lower surface (opposite surface facing the workpiece W) of the elevating frame 11 in the left-right direction, and a driving wheel 17 is provided on the support bracket 15 so as to be horizontally rotatable. Yes. The drive wheel 17 is linked to a motor 19 such as a servo motor mounted on the support bracket 15.

  On the other side of the lower surface of the elevating frame 11 in the left-right direction, a movable bracket 21 is provided that can move in a direction (left-right direction) that approaches and separates from the support bracket 15. A driven wheel 23 is provided to be horizontally rotatable. An endless band saw blade 25 is horizontally wound around the drive wheel 17 and the driven wheel 23. In order to adjust the tension of the band saw blade 25, the lifting frame 11 is provided with a tension adjusting actuator 27 such as a fluid pressure cylinder for moving the movable bracket 21 in the left-right direction. Yes.

  Further, as shown conceptually and schematically in FIG. 2, between the vise device 5 and the drive wheel 17 and between the vise device 5 and the driven wheel 23 at the lower part of the lifting frame 11, Saw blade moving means 29A and 29B are provided for bringing the inner circumferential surfaces of the forward path side portion 25A and the return path side portion 25B of the band saw blade 25 that circulates in proximity to or in contact with each other. Between the saw blade moving means 29A and 29B and the vice device 5, the forward path side portion 25A and the return path side portion 25B which are brought close to each other by the saw blade moving means 29A and 29B are sandwiched and guided. Saw blade guide means 31A and 31B are provided. One saw blade guide means 31B is provided so that its position can be adjusted in the left-right direction corresponding to the size of the workpiece W.

  By the way, the band saw blade 25 has a structure as shown in FIG. That is, when the belt saw blade 25 is wound around the drive wheel 17 and the driven wheel 23, the inner surface of the forward path side portion 25A of the band saw blade 25 and the inner peripheral surface of the return path side portion 25B can be brought into contact with each other. The inner peripheral surface is formed as a smooth surface. The plurality of saw teeth 33 provided on the band saw blade 25 are arranged so that the respective saw teeth 33 do not interfere when the inner peripheral surface of the forward path side portion 25A and the inner peripheral surface of the return path side portion 25B come into contact with each other. 25, only straight teeth 33S that do not perform settling in the left-right direction and set teeth 33B that protrude (bend) toward the outer peripheral surface of the endless band saw blade 25 are provided. In other words, the band saw blade 25 does not have a set tooth that is bent toward the inner peripheral surface.

  The saw blade approaching means 29A, 29B has a configuration as shown in FIG. 4, for example. That is, the saw blade approaching means 29A, 29B presses the outer peripheral surfaces of the forward path side portion 25A and the return path side portion 25B of the band saw blade 25 to approach the inner peripheral surfaces of the forward path side portion 25A and the return path side portion 25B ( A pair of sandwiching rollers 35A and 35B to be brought into contact with each other. More specifically, sliders 37A and 37B that are movable toward and away from each other in the front-rear direction (Y-axis direction) are provided on the lower surface of the elevating frame 11, and the holding rollers 35A and 35B are respectively attached to the sliders 37A and 37B. Is provided vertically and rotatably.

  An operation means for operating the sandwiching rollers 35A and 35B to approach and separate from each other is provided. As the operation means, a screw rod 39 having a right-handed screw and a left-handed screw with a central part in the front-rear direction as a boundary is rotatably provided in the front-rear direction. Female screw members (nut members) 41A and 41B provided in the sliders 37A and 37B are screwed into the respective screw portions of the screw rod 39 so as to be movable. A rotating means 43 such as a manual handle or a motor is interlocked and connected to the screw rod 39.

  Therefore, in a state where the respective sandwiching rollers 35A and 35B are largely separated in the front-rear direction, the forward path side portion 25A and the return path side portion 25B of the band saw blade 25 are arranged between the respective sandwiching rollers 35A and 35B, and the rotating means 43 is operated. Then, the inner peripheral surfaces of the forward path side portion 25A and the return path side portion 25B of the band saw blade 25 can be brought close to each other by bringing the sandwiching rollers 35A and 35B closer to each other. At this time, the inner peripheral surface of the band saw blade 25 has a smooth configuration, and the saw teeth 33 in the band saw blade 25 are only the straight teeth 33S and the set teeth 33B bent toward the outer peripheral surface side, and bent toward the inner peripheral surface side. Since the set teeth are not provided, the inner peripheral surface of the band saw blade 25 can be lightly contacted.

  Note that the configuration of the saw blade moving means 29A and 29B is not limited to the configuration described above. For example, one clamping roller 35A is rotatably provided at a fixed position, and the other clamping roller 35B is provided as one clamping roller 35A. It is also possible to adopt a configuration that moves in the direction of approaching and leaving. Further, as a configuration for moving each of the sandwiching rollers 35A and 35B in the Y-axis direction (front-rear direction), for example, a configuration in which each of the sandwiching rollers 35A and 35B is individually moved by an actuator such as a fluid pressure cylinder, or the like It is also possible to adopt a configuration that approaches and separates. That is, various configurations can be adopted as the configuration of the saw blade moving means 29A and 29B.

  The saw blade guide means 31A and 31B sandwich and guide the band saw blade 25 on both sides of the workpiece W, and have a configuration as shown in FIG. That is, the saw blade guide means 31A, 31B includes a guide block 45, and the guide block 45 includes a back presser 47 that supports the back portions of the forward path side portion 25A and the return path side portion 25B of the band saw blade 25. In addition, insert blocks 49A and 49B are provided to contact and guide the outer peripheral surfaces of the forward path side portion 25A and the return path side portion 25B.

  In the configuration as described above, in order to cut the workpiece W by the band saw machine 1, the band saw blade 25 is driven by the motor 19 and the vertical movement actuator 10 is operated to bring the frame body 9 closer to the workpiece W. Done by moving. When the workpiece W is cut by the band saw blade 25, the forward path side portion 25A and the return path side portion 25B of the band saw blade 25 act on the workpiece W simultaneously.

  That is, the cutting groove G (see FIG. 5) is formed in the workpiece W by the forward path side portion 25A and the backward path side portion 25B that move in opposite directions in the band saw blade 25. The forward path side portion 25A cuts one of the cutting surfaces GA facing the cutting groove G, and the return path side portion 25B cuts the other cutting surface GB.

  Here, when the forward path side portion 25A of the band saw blade 25 cuts the cut surface GA of the cutting piece WP (see FIG. 5) cut and separated from the workpiece W, the return path side portion 25B becomes the main body side portion of the workpiece W (hereinafter, “ The cut surface GB of the workpiece) is cut. Since the band saw blade 25 has only the straight teeth 33S and the set teeth 33B, when the workpiece W is cut, the forward side portion 25A of the band saw blade 25 has a component force in the right direction in FIG. Acting, component force in the left direction acts on the return path side portion 25B. And the component force of the said left-right direction will cancel, and the bending of the workpiece | work W will be suppressed.

  By the way, due to the manufacturing error within the allowable value at the time of manufacturing the band saw blade 25, in FIG. 5, for example, the rightward component force acting on the forward path side portion 25A is more than the leftward component force acting on the return path side portion 25B. If it is large, it will be bent in the right direction in FIG. However, since the band saw blade 25 circulates, when the forward side portion 25A and the backward side portion 25B are interchanged, the leftward component force acting on the backward side portion 25B is now applied to the forward side portion 25A. It becomes larger than the acting component in the right direction. Therefore, this time, a leftward turn is generated.

  As already understood, each saw tooth 33 in the band saw blade 25 has a forward-side portion 25A even if it tends to bend due to a manufacturing error within an allowable error during the manufacture of the band saw blade 25. And the return path side portion 25B, and the cut surface to be cut is replaced, whereby the main body side and the cut piece WP side of the workpiece W are alternately cut, and the occurrence of bending is suppressed as a whole. .

  In the above description, it has been described that the inner peripheral surfaces of the forward path side portion 25A and the return path side portion 25B of the band saw blade 25 are in contact with each other. However, as shown in FIGS. 1 and 2, a tip portion is provided on the lower surface of the elevating frame 11 between the saw blade moving means 29 </ b> A and the drive wheel 17 and between the saw blade moving means 29 </ b> B and the driven wheel 23. Are provided with struts 51A, 51B positioned between the forward path side portion 25A and the return path side portion 25B of the band saw blade 25. A forward side of the band saw blade 25 is provided with a spacer 53 made of a thin plate (plate thickness is, for example, 0.1 to 0.2 mm) made of high-strength steel, cemented carbide, or the like supported at both ends by the columns 51A and 51B. It is also possible to adopt a configuration in which the spacer 53 is provided between the inner peripheral surface of the portion 25A and the inner peripheral surface of the return path side portion 25B.

  According to the above configuration, the portion of the band saw blade 25 that cuts the workpiece W, that is, the forward path side portion 25 </ b> A and the return path side portion 25 </ b> B of the band saw blade 25 are reinforced by the spacer 53. By the way, as the structure of the spacer 53, as shown in FIG. 6A, it is a simple plate shape, or as shown in FIG. 6B, the back portion of the forward path side portion 25A and the return path side portion 25B of the band saw blade 25. It is also possible to adopt a configuration provided with a back presser 53A for holding down.

  Further, as shown in FIG. 6C, the thickness of the spacer 53 can be formed to be 0.2 mm or more, for example. In this case, a portion corresponding to the thickness of the spacer 53 may be left uncut.

  As described above, if there is an uncut portion corresponding to the thickness of the thick spacer 53, when the workpiece W is cut, the uncut portion may come into contact with the spacer 53 and cutting may be impossible. However, when the thickness of the uncut portion is about 0.2 mm or less, the spacer 53 is bent when it abuts, and the bent portion is cut by the sawtooth 33.

  Accordingly, the sawtooth 33 of the band saw blade 25 is provided with an inward protruding portion 33P that protrudes toward the inner peripheral surface of the band saw blade 25. And it is also possible to make it the structure which keeps the space | interval dimension of the inward protrusion part 33P of the sawtooth 33 in the outward path side part 25A and the return path side part 25B below 0.2 mm.

  As can be understood from the above description, according to the present embodiment, the inner peripheral surface of the forward path side portion 25A and the inner peripheral surface of the return path side portion 25B that move in opposite directions in the endless band saw blade 25 are obtained. The spacer 53 is arranged in contact with or between the inner peripheral surfaces, and the workpiece W is simultaneously cut by the forward path side portion 25A and the backward path side portion 25B that move in opposite directions. . Therefore, as described above, the bending of the workpiece W can be effectively suppressed.

  Moreover, since the work W is cut by the forward path side portion 25A and the return path side portion 25B of the band saw blade 25, the cooling water can be supplied from both sides of the work W to the cut portion of the work W. The cutting part of the workpiece W and the band saw blade 25 can be cooled effectively.

  Moreover, according to the said structure, since the workpiece | work W is cut | disconnected simultaneously by the outward path | route part 25A and the return path | route side part 25B whose movement directions are reverse directions, it is a part which moves only to one direction of the band saw blade 25. Unlike the conventional configuration in which the workpiece W is cut, resonance can be suppressed and generation of noise can be suppressed.

  The present invention is not limited to the embodiment as described above, and can be implemented in other forms by making appropriate changes. That is, as the band saw blade 25, for example, as shown in FIG. 7A, a normal repellent saw blade 55 having bevel teeth 55A and repellent teeth 55B is bisected by a center line L in the thickness direction. It is also possible to use the band saw blade 57 of the form described above. Further, as shown in FIG. 7B, in order to finely divide the chips, a band saw blade 59 having a configuration in which the tooth repellent 55B is provided with a slit 55S is divided into two by the center line L. It is also possible.

  It is also possible to use a band saw blade 61 as shown in FIG. That is, the endless band saw blade 61 is provided with saw teeth 63A and 63B having an appropriate shape in the range of about a half-circumferential portion 61A. Each of the saw teeth 63A, 63B is a saw tooth integrally fixed to the half-circumferential portion 61A, and includes an inward protruding portion that protrudes toward the inner peripheral surface side of the band saw blade 61. More specifically, each of the saw blades 63A and 63B is attached to the half circumferential portion 61A in a cantilever manner, and overlaps with a portion of the band saw blade 61 that does not have the saw blade of the remaining half circumferential portion 61B. It protrudes to the side.

  When the workpiece W is cut by the band saw blade 61, it is desirable to cut as shown in FIG. That is, as the band saw blade 61 circulates and moves, as shown in FIG. 9A, when the sawtooth 63 portion moves to the forward path side portion of the band saw blade 61, the right side is inclined so as to be lowered. The work W is cut. When the sawtooth 63 passes through the workpiece W (see FIG. 9B), the band saw blade 61 is inclined so that the left side is lowered (see FIG. 9C). At this time, the arrangement range of the saw teeth 63 in the band saw blade 61 moves to the return path side portion of the band saw blade 61 and cuts the workpiece W in the lower left direction. When the saw tooth 63 at the time of cutting the workpiece W on the return path side passes through the workpiece W (see FIG. 9D), the inclination direction of the band saw blade 61 is changed so that the right side of the band saw blade 61 is lowered. Thereafter, the workpiece W is cut at the forward path side portion of the band saw blade 61 moving in the lower right direction.

  That is, when the portion where the sawtooth 63 is disposed moves to the return path side portion of the band saw blade 61, the band saw blade 61 is inclined and cut to the left downward state, and when the portion where the sawtooth 63 is disposed moves to the forward path side portion. Then, the workpiece W is cut by repeatedly cutting the band saw blade 61 while tilting downward to the right. Accordingly, the cutting length of the workpiece W is shortened, and the workpiece is always cut by moving downward.

  The present invention is not limited to the configuration as described above, and the moving frame can be configured to swing in the vertical direction.

  Further, in the above description, the case where the vice apparatus 5 is configured such that one vise 7A is a fixed vise jaw and the other vice 7B is a movable vise jaw. However, the workpiece W may be cut with the axis of the workpiece W always kept at a fixed position. In this case, it is desirable that both the vice jaws 7A and 7B have an approach / separation configuration. That is, it is desirable that both the vice jaws 7A and 7B be positioned at the left and right target positions with the axis of the workpiece W as the center.

  In the case described above, since the vice jaws 7A and 7B are always located at the target positions, the above-described saw blade guide means 31A and 31B, saw blade moving means 29A and 29B, struts 51A and 51B, and the drive wheel 17, It is desirable that the driven wheel 23 be configured to be positioned symmetrically about the axis of the workpiece W. In this case, the workpiece W is to be cut at the left and right center positions.

1 Band saw machine 5 Vise device 9 Frame body 11 Elevating frame (moving frame)
17 drive wheel 19 motor 23 driven wheel 25 band saw blade 25A forward path side portion 25B return path side portion 29A, 29B saw blade shifting means 31A, 31B saw blade guide means 33 saw teeth 35A, 35B clamping roller 45 guide block 47 back presser 49A, 49B insert Block 51A, 51B Prop 53 Spacer

Claims (7)

  A workpiece cutting method in which a workpiece is cut by an endless band saw blade wound around a drive wheel and a driven wheel, and a portion of the band saw blade that moves in the opposite direction between the drive wheel and the driven wheel. The cutting which opposes in the cutting groove | channel of a workpiece | work by the part which contacts the said inner peripheral surface in contact with an inner peripheral surface, or contacts the said inner peripheral surface to the spacer arrange | positioned between the said inner peripheral surfaces in the direction opposite to each other. A work cutting method characterized by cutting a surface individually.   A workpiece cutting method in which a workpiece is cut by an endless band saw blade wound around a drive wheel and a driven wheel, and has an inward protruding portion that protrudes toward the inner peripheral surface side over about a half circumference of the band saw blade. Spacers provided with a plurality of saw teeth at appropriate intervals, in contact with the inner peripheral surface of the band saw blade that moves in the opposite direction between the drive wheel and the driven wheel, or disposed between the inner peripheral surfaces When the workpiece is cut by contacting the inner peripheral surface, the blades are cut obliquely when the saw blades are cutting the workpiece, and the band saw blades are cut when the saw blades are detached from the workpiece. A workpiece cutting method characterized in that the workpiece is cut obliquely downward again by switching the inclination direction.   An endless band saw blade, the band saw blade having straight teeth that do not protrude toward the outer peripheral surface side and the inner peripheral surface side in the traveling direction of the band saw blade and outer peripheral side protruding teeth that protrude toward the outer peripheral surface side. A band saw blade characterized by comprising.   4. The band saw blade according to claim 3, wherein the protruding teeth on the outer peripheral side are set teeth that have been set out or half-shaped bevel-shaped saw teeth.   An endless band saw blade, which is provided with a plurality of saw teeth having an inward projecting portion projecting toward the inner peripheral surface over an approximately half circumference of the band saw blade at appropriate intervals, and the inward projecting portion is provided in the band saw blade. A band saw blade characterized in that the amount of protrusion is greater than the thickness of the body member.   A band saw machine having an endless band saw blade wound around a drive wheel and a driven wheel, and a vise device capable of fixing a workpiece, and an outer peripheral surface side of the band saw blade between the drive wheel and the driven wheel A saw blade moving roller for bringing the inner surface of the band saw blade close together, and a saw blade guide means for sandwiching and guiding the band saw blade between the vise device and the saw blade moving roller. A band saw machine characterized by comprising.   The band saw machine according to claim 6, wherein a spacer is provided between the inner peripheral surfaces of the band saw blades brought close by the saw blade moving roller.

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