JP2017071028A - Band saw machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a range of a work W being a cutting object, by further reducing a machine minimum material diameter or a machine minimum material width, while improving productivity by high tact operation.SOLUTION: A first saw blade guide 49 has an abutting pin 79 on its right side. A beam member 45 has a stopper pin 81 for regulating the movement in the left direction of a quick approach base 67 between the quick approach base 67 and the first saw blade guide 49. When moving the first saw blade guide 49 in the right direction in a state of allowing the abutting pin 79 to abut on the quick approach base 67, the quick approach base 67 moves in the right direction against energization force of a spring 83, and releases an abutting state of a left side part of the quick approach base 67 and the stopper pin 81.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a band saw machine that performs a cutting process on a portion to be cut of a bar-like (including round bar or square bar) workpiece positioned at a cutting position in a conveying direction while running an endless band saw blade.

  Usually, the band saw machine is provided with a saw blade guide mechanism for preventing the band saw blade from being bent. The saw blade guide mechanism has a pair of saw blade guides that are suspended between a pair of saw blade wheels in a cutting head (saw blade housing) and guide the band saw blade in the traveling direction. Are spaced apart in the transport width direction perpendicular to the transport direction. Further, the first saw blade guide (one saw blade guide) is located on one side in the transport width direction relative to the second saw blade guide (the other saw blade guide), and is movable in the transport width direction. (See Patent Document 1 and Patent Document 2).

  The band saw machine is provided with a quick approach mechanism for rapidly bringing the band saw blade closer to the workpiece when productivity is improved by high tact operation. The quick approach mechanism includes a quick approach bar provided so as to be movable up and down between a pair of saw blade guides in the cutting head. Moreover, the quick approach bar is provided with a workpiece contact member that contacts the workpiece prior to the band saw blade on the lower end side thereof. The cutting head is rapidly lowered under the control of the electric motor for cutting head or the hydraulic cylinder until the workpiece contact member comes into contact with the workpiece (see Patent Document 3 and Patent Document 4).

JP 2015-33743 A JP 2006-255839 A JP 2003-25144 A JP-A-11-77430

  By the way, in order to prevent the band saw blade from being bent and maintain the machining accuracy of the workpiece cutting surface, the distance between the pair of saw blade guides in the conveying width direction is determined according to the workpiece cutting width, in other words, the workpiece. It is necessary to set the interval according to the cross-sectional diameter or cross-sectional width. On the other hand, when the cross-sectional diameter or the cross-sectional width of the work is reduced, the first saw blade guide moves to the other side in the conveyance width direction and interferes with a part of the quick approach mechanism. In other words, using the quick approach mechanism, while improving productivity by high tact operation, the minimum cross section diameter or minimum cross section width of a work that can be cut, in other words, the minimum machine material diameter or the minimum machine material width is reduced. Therefore, there is a problem that it is difficult to expand the range of the workpiece to be cut.

  Accordingly, an object of the present invention is to provide a band saw machine having a novel configuration that can solve the above-described problems.

  An aspect of the present invention is to perform cutting processing on a cut portion of a bar-shaped (including round bar shape and square bar shape) workpiece positioned at a cutting position in the conveying direction while running (circulating running) an endless band saw blade. A main body vise mechanism having a pair of main body vice jaws provided on a base (main body frame) and facing a transport width direction orthogonal to the transport direction and sandwiching a workpiece. A cutting head (saw blade housing) provided so that it can be moved up and down (movable in the vertical direction), and is provided on the cutting head so as to be rotatable and spaced apart in the conveying width direction. A pair of saw blade wheels to be supported and a pair of saw blade wheels in the cutting head are suspended (provided in a suspended state) and spaced apart in the conveying width direction, and the band saw blade is moved in the traveling direction. Guide A saw blade guide mechanism having a pair of saw blade guides, wherein the first saw blade guide (one of the saw blade guides) is movable in the conveying width direction, and the pair of the cutting blades in the cutting head. A quick approach base (sliding member) provided between the saw blade guides so as to be movable in the conveyance width direction, a quick approach bar provided on the quick approach base so as to be movable up and down, and a lower end side of the quick approach bar A workpiece abutting member that abuts against the workpiece prior to the band saw blade, and is provided in the quick approach mechanism and the cutting head, and moves on one side of the quick approach base in the conveyance width direction ( A stopper that restricts the movement operation) and a biasing member that biases the quick approach base toward one side in the transport width direction. It is that Bei was.

  According to the aspect of the present invention, after the workpiece to be cut is positioned at the cutting position, the first main body vise jaw is moved to the other side in the transport width direction (second main body vise jaw side). The workpiece is clamped by the cooperation of the pair of main body vise jaws. Thereby, a workpiece | work can be fixed with respect to the said base.

  Then, in a state where the band saw blade is driven by the rotation of the pair of saw blade wheels, the cutting head is rapidly lowered until the work contact member contacts the work, and the band saw blade is rapidly applied to the work. Move closer. Thereafter, while the saw blade guide mechanism prevents the band saw blade from being bent, the speed of the cutting head is lowered and the cutting head is lowered at the cutting feed speed. Thereby, it can cut | disconnect with respect to the to-be-cut | disconnected part of a workpiece | work, and can take out a product from a workpiece | work.

  Before the cutting head is lowered rapidly, the first saw blade guide is moved in the transport width direction, and the distance between the pair of saw blade guides in the transport width direction is the work cutting width, in other words, The interval is set according to the cross-sectional diameter or cross-sectional width of the workpiece. Specifically, when the cross-sectional diameter or cross-sectional width of the workpiece is large, the interval between the pair of saw blade guides in the transport width direction is set large. When the cross-sectional diameter or the cross-sectional width of the workpiece is small, the distance between the pair of saw blade guides in the transport width direction is set small.

  And when the cross-sectional diameter or cross-sectional width of the workpiece is smaller, the first saw blade guide is moved to the other side in the transport width direction in a state of being in contact with a part of the quick approach mechanism. Accordingly, the gap in the conveyance width direction of the pair of saw blade guides is set to be smaller while moving the quick approach base to the other side in the conveyance width direction against the urging force of the urging member. Can do.

  According to the present invention, as described above, the quick approach base is moved to the other side in the transport width direction against the biasing force of the biasing member, and the pair of saw blade guides in the transport width direction. Can be set smaller. Therefore, the minimum cross-sectional diameter or minimum cross-sectional width of the work that can be cut by the amount corresponding to the movement amount of the quick approach base to the other side in the transport width direction, in other words, the minimum machine material diameter or the minimum machine material width Can be reduced. That is, according to the present invention, by using the quick approach mechanism, while improving productivity by high tact operation, the machine minimum material diameter or the machine minimum material width is further reduced, and the range of the workpiece to be cut Can be enlarged.

FIG. 1 is an enlarged view of an arrow I in FIG. FIG. 2 is a front view of the band saw machine according to the embodiment of the present invention. FIG. 3 is a plan view of the band saw machine according to the embodiment of the present invention. FIG. 4 is a side view of the band saw machine according to the embodiment of the present invention. FIG. 5 is a diagram for explaining a contact condition between the workpiece contact member and the top of the round bar-shaped workpiece W having the maximum cross-sectional diameter that can be cut. FIG. 6 is a diagram for explaining the contact condition between the workpiece contact member and the top of the round bar-shaped workpiece W having the minimum cross-sectional diameter that can be cut.

  Embodiments of the present invention will be described with reference to the drawings. In the specification and claims of the present application, “provided” means not only being provided directly but also indirectly provided via a separate member, Is synonymous. “Providing” means to provide indirectly through another member in addition to providing directly, and is synonymous with “providing”. “Cutting position” refers to a position in the transport direction where cutting is performed. In the drawings, “FF” is the forward direction (transport direction), “FR” is the backward direction (the direction opposite to the transport direction), “L” is the left direction (one side of the transport width direction), “R”. "Indicates the right direction (the other side in the conveyance width direction)," U "indicates the upward direction, and" D "indicates the downward direction.

  As shown in FIGS. 1 to 4, the band saw 1 according to the embodiment of the present invention is positioned at a cutting position CP in the transport direction (forward direction) while traveling (circulating) an endless band saw blade B. A round bar-shaped or square bar-shaped workpiece (only a round bar-shaped workpiece is illustrated) W is cut. And the specific structure of the band saw machine 1 which concerns on embodiment of this invention is as follows.

  The band saw machine 1 includes a base (main body frame) 3 extending in the transport width direction (left-right direction) orthogonal to the transport direction, and a support frame 5 provided on the rear side of the base 3 and extending in the front-rear direction. It has. The base 3 includes a main body vise mechanism 7 that fixes the work W to the base 3 on the upper surface of the base 3 immediately downstream of the cutting position CP (directly downstream in the transport direction). The main body vise mechanism 7 includes a main body vise bed (processing table) 9 that is provided on the upper surface of the base 3 and supports the workpiece W. The main body vise bed 9 includes a pair of main body vice jaws 11 and 13 that sandwich the workpiece W on the upper surface thereof, and the pair of main body vice jaws 11 and 13 are opposed to each other in the conveyance width direction. The first main body vise jaw (one main body vise jaw) 11 is located on the left side (one side in the transport width direction) of the second main body vise jaw (the other main body vise jaw) 13. Furthermore, the main body vise bed 9 includes a hydraulic main body moving cylinder 15 that moves the first main body vice jaw 11 in the conveyance width direction on the left side thereof. The main body vise bed 9 includes a hydraulic main body displacement cylinder 17 that displaces (slightly moves) the second main body vice jaw 13 in the conveyance width direction on the right side thereof. When the piston (not shown) of the main body displacement cylinder 17 reaches the left end of the stroke in the left direction, the vice reference position VP in the transport width direction that serves as a reference for the vise surface 13s of the second main body vise jaw 13 to transport the workpiece W. It is supposed to be located in.

  The support frame 5 includes, on the upper side (upper surface) thereof, a transfer table 19 that supports the workpiece W so as to be movable in the transfer direction. A front side portion of the transfer table 19 extends to the upper side of the base 3. The transport table 19 has a plurality of transport rollers 21 arranged at intervals in the transport direction, and each transport roller 21 is around an axis parallel to the transport width direction (axis of the transport roller 21). It can be rotated.

  The support frame 5 includes a plurality of guide rails 23 extending in the transport direction on the upper surface thereof, and the plurality of guide rails 23 have a transport vise mechanism 25 that transports the workpiece W on the upper side thereof in the transport direction and the direction thereof. It is prepared to be movable in the opposite direction (front-rear direction). In other words, the transport vice mechanism 25 is provided on the support frame 5 so as to be movable in the transport direction and the opposite direction via the plurality of guide rails 23. The transport vice mechanism 25 has a transport vise bed (transport slider) 27 that is provided on the support frame 5 through a plurality of guide rails 23 so as to be movable in the transport direction. It has an open U shape. In addition, the transfer vise bed 27 includes a transfer vise bed electric motor (not shown) and a ball screw (not shown) provided at an appropriate position of the support frame 5, or a hydraulic transfer vise bed cylinder (not shown). It moves in the transport direction by driving. Further, the transport vise bed 27 includes a pair of transport vise jaws 29 and 31 that sandwich the workpiece W on the upper side thereof, and the pair of transport vise jaws 29 and 31 are opposed to each other in the transport width direction. The pair of transfer vise jaws 29 and 31 are positioned above the transfer table 19, and the first transfer vise jaw (one transfer vise jaw) 29 is the second transfer vise jaw (the other transfer vise jaw). ) 31 in the left direction (one side in the conveyance width direction). And the conveyance vice bed 27 is provided with the hydraulic conveyance movement cylinder 33 which moves the 1st conveyance vice jaw 29 to the conveyance width direction in the left part. The conveyance vice bed 27 includes a hydraulic conveyance displacement cylinder 35 that displaces the second conveyance vice jaw 31 in the conveyance width direction on the right side thereof. When the piston (not shown) of the transport displacement cylinder 35 reaches the left stroke end, the vice surface 31s of the second transport vise jaw 31 is positioned at the vice reference position VP in the transport width direction.

  The base 3 includes a guide post 37 in the vicinity of the cutting position CP on the upper surface thereof, and the guide post 37 extends in the vertical direction. Further, the guide post 37 includes a cutting head (saw blade housing) 39 extending in the cutting width direction on its outer peripheral surface so as to be movable up and down (movable in the vertical direction). In other words, the cutting head 39 is provided in the vicinity of the cutting position CP on the upper surface of the base 3 so as to be movable up and down via the guide post 37. The cutting head 39 is moved up and down by driving a cutting head electric motor (not shown) and a ball screw (not shown) provided at an appropriate position on the base 3 or a hydraulic cutting head cylinder (not shown). It is supposed to be.

  The cutting head 39 is rotatably provided with a pair of saw blade wheels 41 and 43 that wind and support the band saw blade B on its front side (front side), and the pair of saw blade wheels 41 and 43 are transported. Separated in the width direction. The first saw blade wheel (one saw blade wheel) 41 is driven by a hydraulic wheel cylinder (not shown) provided at an appropriate position of the cutting head 39 to drive the second saw blade wheel (drive). The position can be adjusted in the conveyance width direction approaching and separating from the saw blade wheel 27. Further, the wheel shaft (not shown) of the second saw blade wheel (the other saw blade wheel) 43 is an output shaft (not shown) of a wheel electric motor (not shown) provided at an appropriate position of the cutting head 39. ). In other words, the pair of saw blade wheels 41 and 43 are rotated by the drive of the wheel electric motor.

  The cutting head 39 has a beam member 45 extending in the conveying direction between a pair of saw blade wheels 41 and 43, and this beam member 45 prevents the band saw blade B from being bent on its front side. A saw blade guide mechanism 47 is provided. The saw blade guide mechanism 47 has a pair of saw blade guides 49 and 51 that are suspended (provided in a suspended state) on the beam member 45 and guide the band saw blade B in the running direction while being twisted. The pair of saw blade guides 49 and 51 are separated in the transport width direction. The first saw blade guide (one saw blade guide) 49 is located on the left side of the second saw blade guide (the other saw blade guide) 51, and is conveyed via a plurality of guide rails 53. It is configured to be movable in the width direction. Each saw blade guide 49 (51) has a saw blade insert 55 (57) on the lower end side thereof for guiding the body of the band saw blade B with a gap maintained on at least one side in the blade thickness direction of the band saw blade B. doing.

  The first main body vise jaw 11 includes a follow-up guide 59 extending in the vertical direction at an appropriate position. The follow-up guide 59 has a U-shaped cross section (a U-shaped cross section), in other words, has a guide groove 61 extending in the vertical direction. Further, the first saw blade guide 49 includes a roller 63 as a mover at an appropriate position. The roller 63 is rotatable about an axis parallel to the conveyance direction, and is fitted to the guide groove 61 of the follow-up guide 59 so as to be movable up and down. When the band saw machine 1 moves the first main body vice jaw 11 in the conveyance width direction, the roller 63 moves up and down along the guide groove 61 of the follow-up guide 59 and the first saw blade guide 49 moves in the conveyance width. It is configured to move in synchronization with the direction.

  As shown in FIG. 1, the beam member 45, which is a part of the cutting head 39, has a quick approach mechanism 65 for rapidly bringing the band saw blade B close to the workpiece W between a pair of saw blade guides 49 and 51. I have. The quick approach mechanism 65 has a quick approach base (sliding member) 67 provided between a pair of saw blade guides 49 and 51 in the beam member 45 so as to be movable in the conveyance width direction via a plurality of guide rails 53. ing. The quick approach base 67 has a support groove (guide groove) 69 extending in the vertical direction. The quick approach base 67 includes a quick approach bar 71 that can be moved up and down and cannot be detached in the support groove 69. The quick approach bar 71 extends in the vertical direction. The quick approach bar 71 includes a workpiece contact member 73 that contacts the workpiece W prior to the band saw blade B on the lower end side thereof. The quick approach bar 71 includes a stopper piece 75 that restricts the lowering (lowering operation) of the quick approach bar 71 with respect to the cutting head 39 on the upper end side thereof. Further, the quick approach base 67 is provided with a sensor 77 such as a limit switch for detecting the start of the rising (upward movement) of the quick approach bar 71 with respect to the cutting head 39 at an appropriate position. In other words, the quick approach base 67 includes a sensor 77 that detects that the workpiece contact member 73 is in contact with the workpiece W at an appropriate position. Then, the cutting head 39 is rapidly lowered by the control of the electric motor for cutting head or the hydraulic cylinder until a detection signal is output from the sensor 77.

  The first saw blade guide 49 has a contact pin 79 that can contact a quick approach base 67 that is a part of the quick approach mechanism 65 on the right side thereof. Further, the beam member 45 which is a part of the cutting head 39 moves the quick approach base 67 in the left direction (one side in the conveyance width direction) between the quick approach base 67 and the first saw blade guide 49. A stopper pin 81 is provided as a restricting stopper. The stopper pin 81 can come into contact with the left side portion of the quick approach base 67. The stopper pin 81 is located rearward of the first saw blade guide 49. Even if the first saw blade guide 49 is moved rightward, the stopper pin 81 and the first saw blade guide 49 are not moved. It is designed not to interfere. Furthermore, the beam member 45 includes a spring (compression spring) 83 as an urging member that urges the quick approach base 67 leftward at an appropriate position. When the first saw blade guide 49 is moved in the right direction (the other side in the conveyance width direction) with the contact pin 79 in contact with the quick approach base 67, the band saw machine 1 67 is configured to move rightward against the urging force of the spring 83 so that the contact state between the left side portion of the quick approach base 67 and the stopper pin 81 is released.

  As shown in FIG. 5, the band saw machine 1 has the left side of the workpiece contact member 73 (in the conveyance width direction) with the left side of the quick approach base 67 in contact with the stopper pin 81 by the biasing force of the spring 83. The one end side) is configured to come into contact with the top of a round bar-shaped workpiece W having a maximum cross-sectional diameter that can be cut. Further, as shown in FIG. 6, the band saw 1 is in a state where the contact state between the left side portion of the quick approach base 67 and the stopper pin 81 is released, and the right end side of the workpiece contact member 73 (other in the transport width direction). The end side) is configured to come into contact with the top of a round bar-shaped workpiece W having a minimum sectional diameter that can be cut. In other words, between the workpiece contact member 73 and the top of the round bar-shaped workpiece W having the maximum cross-sectional diameter that can be cut, and the top of the round bar-shaped workpiece W having the minimum cross-sectional diameter that can be cut. A predetermined contact condition (contact relationship) is set in between.

  Then, the effect | action and effect of embodiment of this invention are demonstrated.

  The work W is carried into the transfer table 19 and a part of the work W is interposed between the pair of transfer vise jaws 29 and 31. Then, with the vice surface 31 s of the second transfer vise jaw 31 positioned at the vice reference position VP, the first transfer vise jaw 29 is moved to the right (the other side in the transfer width direction) by driving the transfer moving cylinder 33. Move to. Thereby, the workpiece | work W can be clamped by cooperation of a pair of conveyance vise jaws 29 and 31. FIG.

  After sandwiching the workpiece W by the cooperation of the pair of transfer vise jaws 29 and 31, the transfer vise bed 27 is moved in the transfer direction by driving a transfer vise bed electric motor (not shown). Thereby, the to-be-cut part Wa of the workpiece | work W can be positioned in the cutting position CP.

  After positioning the cut portion Wa of the workpiece W at the cutting position CP, the first main body is driven by driving the main body moving cylinder 15 with the vice surface 13s of the second main body vise jaw 13 positioned at the vice reference position VP. Move the vice jaw 11 to the right. Accordingly, the workpiece W can be clamped and fixed to the base 3 by the cooperation of the pair of main body vise jaws 11 and 13. Further, the first saw blade guide 49 can be moved rightward in conjunction with the movement of the first main body vise jaw 11 while the roller 63 is lowered along the guide groove 61 of the follow-up guide 59. Then, the space | interval of the left-right direction (conveyance width direction) of a pair of saw blade guides 49 and 51 is set to the space | interval according to the cutting width of the workpiece | work W, ie, the space | interval according to the cross-sectional diameter or cross-sectional width of the workpiece | work W. . Specifically, when the cross-sectional diameter or the cross-sectional width of the workpiece W is large, the space between the pair of saw blade guides 49 and 51 is set large. When the cross-sectional diameter or cross-sectional width of the workpiece W is small, the distance between the pair of saw blade guides 49 and 51 in the left-right direction can be set small.

  When the cross-sectional diameter or cross-sectional width of the workpiece W is smaller, the first saw with the contact pin 79 that is a part of the first saw blade guide 49 in contact with the quick approach base 67. The blade guide 49 is moved rightward in conjunction with the movement of the first main body vise jaw 11. As a result, the distance between the pair of saw blade guides 49 and 51 in the left-right direction can be set smaller while moving the quick approach base 67 in the right direction against the biasing force of the spring 83.

  After the work W is fixed to the base 3, the pair of saw blade wheels 41 and 43 are rotated by driving the wheel electric motor, and the band saw blade B travels (circulates). Then, until the detection signal is output from the sensor 77, in other words, until the workpiece contact member 73 contacts the workpiece W, the cutting head 39 is rapidly lowered by the control of the electric motor for cutting head or the hydraulic cylinder. Then, the band saw blade B is brought close to the workpiece W rapidly. Thereafter, while the saw blade guide mechanism 47 prevents the band saw blade B from being bent, the speed of the cutting head 39 is decreased and the cutting head 39 is lowered at the cutting feed speed. Thereby, it is possible to take a product from the workpiece W by cutting the workpiece Wa of the workpiece W.

  As described above, according to the embodiment of the present invention, as described above, the quick approach base 67 is moved in the right direction (the other side in the conveyance width direction) against the urging force of the spring 83, and the pair of saws is moved. The distance between the blade guides 49 and 51 in the left-right direction (conveyance width direction) can be set smaller. Therefore, the minimum cross-sectional diameter or the minimum cross-sectional width of the work W that can be cut, in other words, the minimum machine material diameter or the minimum machine material width is reduced by an amount corresponding to the amount of movement of the quick approach base 67 in the right direction. Can do. That is, according to the embodiment of the present invention, the quick approach mechanism 65 is used to cut the machine minimum material diameter or the machine minimum material width while improving the productivity due to the high tact operation and reducing the machine minimum material diameter or the machine minimum material width. The range of the workpiece W can be expanded.

  In particular, as described above, between the workpiece contact member 73 and the top of the round bar-shaped workpiece W having the maximum cross-sectional diameter that can be cut, and the round bar-shaped workpiece W having the minimum cross-sectional diameter that can be cut from the workpiece contact member 73. Predetermined contact conditions are set between the top and the top. Therefore, it is possible to further expand the range of the workpiece W to be cut by reducing the machine minimum material diameter as much as possible while suppressing the stretching (expansion) of the workpiece contact member 73 in the left-right direction.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, For example, it can implement in a various aspect as follows. That is, instead of guiding the body portion of the band saw blade B with the saw blade insert 55 (57) maintaining a gap on at least one side in the blade thickness direction of the band saw blade B, the body portion of the band saw blade B is clamped. You may guide. Further, instead of guiding the band saw blade B in the traveling direction with the pair of saw blade guides 49 and 51 being twisted, the band saw blade B can be moved in the traveling direction without twisting as shown in Japanese Patent Application Laid-Open No. 2013-188861. You may guide. The scope of rights encompassed by the present invention is not limited to the above-described embodiment.

B Band saw blade CP Cutting position VP Vise reference position W Work Wa Cut part 1 Band saw machine 3 Base 5 Support frame 7 Main body vice mechanism 9 Main body vise bed 11 First main body vice jaw 13 Second main body vice jaw 15 Main body movement Cylinder 17 Body displacement cylinder 19 Transport table 23 Guide rail 25 Transport vise mechanism 29 First transport vise jaw 31 Second transport vise jaw 33 Transport moving cylinder 35 Transport displacement cylinder 37 Guide post 39 Cutting head 41 Saw blade wheel 43 Saw Blade wheel 45 Beam member 47 Saw blade guide mechanism 49 First saw blade guide 51 Second saw blade guide 53 Guide rail 55 Saw blade insert 57 Saw blade insert 59 Following guide 61 Guide groove 63 Roller 65 Quick approach mechanism 67 Quick approach Base 6 9 Support groove 71 Quick approach bar 73 Work contact member 75 Stopper piece 77 Sensor 79 Contact pin 81 Stopper pin (stopper)
83 Spring (biasing member)

Claims (5)

A band saw machine that performs a cutting process on a cut part of a rod-shaped workpiece positioned at a cutting position in the conveyance direction while running an endless band saw blade,
A main body vise mechanism having a pair of main body vice jaws provided on a base, facing a conveyance width direction orthogonal to the conveyance direction and sandwiching a workpiece;
A cutting head provided on the base so as to be movable up and down;
A pair of saw blade wheels that are rotatable on the cutting head and spaced apart in the transport width direction, and support the wound saw blade by winding it;
A pair of saw blade guides suspended between a pair of saw blade wheels in the cutting head, spaced apart in the transport width direction and guiding the band saw blade in a running direction, the first saw blade guide A saw blade guide mechanism configured to be movable in the transport width direction;
A quick approach base provided between the pair of saw blade guides in the cutting head so as to be movable in the conveying width direction, a quick approach bar provided so as to be movable up and down on the quick approach base, and the quick approach bar A quick approach mechanism having a workpiece contact member provided on the lower end side of the workpiece and contacting the workpiece prior to the band saw blade;
A stopper provided on the cutting head and restricting movement of the quick approach base on one side in the transport width direction;
A band saw machine comprising: a biasing member that biases the quick approach base toward one side in the conveyance width direction.   When the first saw blade guide is moved to the other side in the conveyance width direction in a state where the saw blade guide is in contact with a part of the quick approach mechanism, the quick approach base resists the biasing force of the biasing member. The band saw machine according to claim 1, wherein the band saw machine is configured to move to the other side in the conveyance width direction.   In a state in which a part of the quick approach mechanism is in contact with the stopper, one end side of the workpiece contact member in the conveyance width direction is configured to contact the top of a round bar-shaped workpiece having a maximum sectional diameter that can be cut. The top of the round bar-shaped workpiece having a minimum cross-sectional diameter that can be cut at the other end in the conveyance width direction of the workpiece contact member in a state where the contact state between a part of the quick approach mechanism and the stopper is released The band saw machine according to claim 2, wherein the band saw machine is configured to abut against the band saw. A follow-up guide provided on the first body vise jaw and having a guide groove extending in the vertical direction;
A mover provided on the first saw blade guide and fitted in the guide groove of the follow-up guide so as to be movable up and down;
2. The structure according to claim 1, wherein when the first main body vice jaw is moved in the transport width direction, the first saw blade guide is moved in conjunction with the transport width direction. The band saw machine according to any one of items 3 to 4.   Each of the saw blade guides has a saw blade insert that guides the body portion of the band saw blade at a lower end side thereof with a gap maintained on at least one side in the blade thickness direction of the band saw blade. The band saw machine according to any one of claims 4 to 5.

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